KING GEORGE’S GATE
KINGSTON ROAD, TOLWORTH
ENERGY STRATEGY
MARCH 2015
Buildings & Places
Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
Energy Strategy
King George’s Gate,
Kingston Road, Tolworth
March 2015
Buildings & Places
Prepared by:
.......................................................
Ioanna Mytilinaiou
Energy Consultant
Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
Checked by:
March 2015
..................................................................
Oliver Riley
Technical Director
Mark Taylor
Principal Energy Consultant
Approved by:
Rev
No
5
.......................................................
Oliver Riley
Technical Director
Comments
Final Issue (updated Appendix A)
Checked
by
OR
Approved
by
OR
Date
13/03/2015
AECOM, 6-8 Greencoat Place, London, SW1P 1PL
Telephone: 020 7798 5200 Website: http://www.aecom.com
47071786
King George’s Gate, Kingston Road, Tolworth
March 2015
This document has been prepared by AECOM Limited for the sole use of our client (the “Client”) and in
accordance with generally accepted consultancy principles, the budget for fees and the terms of reference
agreed between AECOM Limited and the Client. Any information provided by third parties and referred to
herein has not been checked or verified by AECOM Limited, unless otherwise expressly stated in the
document. No third party may rely upon this document without the prior and express written agreement of
AECOM Limited.
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TABLE OF CONTENTS
Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
March 2015
EXECUTIVE SUMMARY ..................................................................... 4
1
INTRODUCTION ............................................................... 7
2
PROPOSED DEVELOPMENT DESCRIPTION ................ 8
3
PLANNING CONTEXT ...................................................... 9
3.1
National Policy ................................................................. 9
3.2
Regional Policy .............................................................. 10
3.2.1
The London Plan 2011 (Early Minor Alterations, October
2013) ................................................................................ 10
3.2.2
Sustainable Design and Construction Supplementary
Planning Guidance (2014) ............................................. 11
3.2.3
Delivering London’s Energy Future: The Mayor’s
Climate Change Mitigation and Energy Strategy (2011)
......................................................................................... 12
3.2.4
Energy Planning – Greater London Authority Guidance
on Preparing Energy Assessment (2014) .................... 12
3.2.5
London Heat Network Manual (2014) ........................... 12
3.2.6
Integrating Renewable Energy into New Developments:
Toolkit for Planners, Developers and Consultants (2004)
......................................................................................... 12
3.3
Local Planning Policy .................................................... 12
3.3.1
Adopted Core Strategy (2012) ...................................... 13
3.3.2
Kingston Town Centre Area Action Plan (2008) ......... 14
3.3.3
Kingston Plan – Our vision for 2020 (2009) ................ 14
4
5
6
ASSESSMENT METHODOLOGY .................................. 15
BASELINE ASSESSMENT ............................................. 16
BE LEAN – PASSIVE DESIGN AND ENERGY
EFFICIENCY APPRAISAL .............................................. 17
6.1
Minimising solar gains .................................................. 17
6.2
Passive Design and Energy Efficiency Measures ...... 17
6.3
Proposed ‘Be Lean’ Scheme ........................................ 19
7
BE CLEAN – LOW CARBON TECHNOLOGY APPRAISAL
......................................................................................... 20
7.1
Introduction to Be Clean Technologies ....................... 20
7.2
Applicability to the Proposed Development ............... 20
7.2.1
Connection to Existing District Heating Schemes ..... 20
7.2.2
On-site site-wide CHP opportunities ........................... 21
7.2.3
Combined Cooling, Heat and Power technology ....... 21
7.3
Proposed ‘Be Clean’ Scheme ....................................... 22
8
BE GREEN - RENEWABLE ENERGY TECHNOLOGIES23
8.1
Photovoltaic (PV) Arrays ............................................... 23
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Proposed ‘Be Green’ Scheme ...................................... 23
9
CONCLUSIONS .............................................................. 24
APPENDIX A – SITE PLAN............................................................... 27
APPENDIX B – ENERGY DEMAND ASSESSMENT ....................... 28
APPENDIX C – LONDON HEAT MAP .............................................. 29
APPENDIX D – DISTRICT HEATING NETWORK LIAISON WITH
TOLWORTH TOWERS ................................................... 30
APPENDIX E – PLANT ROOM LOCATION ..................................... 31
APPENDIX F – PLANT ROOM LAYOUT .......................................... 32
APPENDIX G – APPRAISAL OF RENEWABLE ENERGY
TECHNOLOGIES ............................................................ 33
APPENDIX H – ROOF LAYOUT ....................................................... 37
APPENDIX I – WIND SPEED DATABASE ....................................... 38
APPENDIX J – AQMA REGION ........................................................ 39
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EXECUTIVE SUMMARY
This Energy Strategy has been prepared by AECOM on behalf of Spenhill Developments Limited in
support of a full planning application for the development at the former Toby Jug and Ministry of
Defence (MOD) site in Kingston Road, Tolworth (herein referred to as the ‘Proposed Development’),
in the Royal Borough of Kingston upon Thames (RBKT).
The Proposed Development will comprise circa 705 dwellings as well as small commercial spaces.
The buildings range between 3 to 18 storeys.
In compliance with the Greater London Authority (GLA) guidance, the energy consumption and
carbon dioxide (CO2) emissions associated with the Proposed Development will be reduced by
following the Mayor’s Energy Hierarchy:
•
passive design and energy efficiency (i.e. Be Lean);
•
energy efficient supply of services (i.e. Be Clean); and
•
on-site renewable energy technologies to provide energy (i.e. Be Green).
The energy consumption and associated CO2 emissions of the residential elements of the Proposed
Development have been estimated using approved Standard Assessment Procedure (SAP) software
compliant with the Building Regulations Approved Document L (ADL)1A 2013.
The baseline scheme is defined as that meeting the requirements of the Building Regulations ADL A
2013. The new building’s baseline CO2 emissions for regulated and non-regulated energy uses are
presented in Table 1.
It is proposed to reduce the energy demand of the Proposed Development by incorporating passive
design and energy efficiency measures where possible (i.e. the Be Lean scheme). The achievable
savings in regulated CO2 emissions are estimated to be 7% over the baseline.
The potential for connection to nearby existing low carbon heat distribution networks was
investigated and is not considered viable at this time. However, an on-site Combined Heat and
Power (CHP) option is considered feasible for the Proposed Development. This could serve all but
the 26 townhouses located on the southwest part of the site, which will be provided individual gas
boilers, due to their low density and distance from the central plant room. The commercial units shall
also be provided with a connection to the district heating mains as well as having an allowance for
electrical heating as part of the fit out, for commercial reasons. The installation of the CHP unit (i.e.
the Be Clean scheme) would be expected to result in 20% savings in CO2 emissions over the ‘Be
Lean’ scheme. Whilst this strategy is feasible and considered appropriate, there are significant
challenges in the operation and logistics of managing this strategy, especially when considering
organisational responsibility.
An analysis of the feasibility of on-site renewable energy technologies has been undertaken and
Photovoltaic (PV) panels have been identified as feasible for on-site electricity generation. The
2
proposed PV panels of 1,140 m area (178 kWp), which will be connected to the landlord areas
associated with the residential units, could provide a 10% reduction in regulated CO2 emissions over
the ‘Be Clean’ scheme. In total, a 33% reduction in regulated CO2 emissions over the baseline is
estimated to be achievable.
The proposed strategy including Solar PV and CHP is considered feasible at this time. A review of
the proposed strategy will be undertaken prior to detailed design to take into account the rapid pace
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of product innovation and development in this sector. This approach aims to capture the most
appropriate and advantageous solution at time of construction.
It is concluded that due to the site constraints and the nature of the Proposed Development, the
London Plan target of 35% reduction in CO2 emissions cannot feasibly or viably be met on-site.
Policy 5.2 Part (E) of The London Plan establishes that the shortfall could be met either through off
site CO2 reduction projects or via a payment into an offsetting fund, should such a mechanism be in
place.
Figure 1 presents the estimated Proposed Development regulated CO2 emissions after each stage
of the Mayor’s Energy Hierarchy and Table 1 shows the total regulated CO2 emissions for each
stage. Table 2 demonstrates the regulated CO2 emissions savings after each stage of the Mayor’s
Energy Hierarchy and the percentage of reduction over the baseline. Table 3 shows the annual and
cumulative shortfall of CO2 emissions over the target savings.
The individual percentage savings shown in Table 2 and Figure 1 are a reduction from each stage of
the Mayor’s Energy Hierarchy. The total cumulative savings for the Proposed Development
represent the total reduction over the baseline (281 tonnes of CO2 savings against the baseline of
856 tonnes CO2 per year equating to 33%).
Table 1: CO2 Emissions after Each Stage of the Mayor’s Energy Hierarchy
CO2 EMISSIONS (TONNES CO2 ANNUALLY)
Assessment
Regulated
Unregulated
Building Regulations ADL A 2013
Compliant Baseline
856
265
After energy demand reduction
796
265
After low carbon technology
640
265
After renewables
575
265
Table 2: Regulated CO2 Savings from Each Stage of the Mayor’s Energy Hierarchy
REGULATED CO2 SAVINGS
Assessment
(Tonnes CO2 Annually)
(%)
Savings from energy demand
reduction (over Baseline)
61
7%
Savings from low carbon
technology (CHP) (Over ‘Be Lean’)
155
20%
Savings from renewable
technology (Over ‘Be Clean’)
66
10%
Total cumulative savings for the
site (Over Baseline)
282
33%
Total Target Savings
300
35%
Annual Shortfall
18
-
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Table 3: Shortfall in Regulated CO2 Savings
CO2 EMISSIONS (TONNES CO2 ANNUALLY)
Annual Shortfall
(Tonnes CO2)
Cumulative Shortfall
(over a 30-year period) (Tonnes CO2)
18
540
Shortfall
Energy Efficiency
Measures
DH/CHP
Renewable
Energy (PV)
900
800
7%
Total Regulated CO2 Emissions (tonnes) p.a
7%
700
25%
600
25%
33%
500
400
300
200
100
0
Be Lean
Be Clean
Building Regs 2013 Target Emissions Rate
Be Green
London Plan 2013 Target
Figure 1: Estimated Proposed Development Regulated CO2 Reduction
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INTRODUCTION
This Energy Strategy has been prepared on behalf of Spenhill Developments Limited in support of a
full planning application for the construction of approximately 705 residential dwellings and a number
of non-domestic units situated at King George’s Gate site in Kingston Road, Tolworth (herein
referred to as the ‘Proposed Development’), in the Royal Borough of Kingston upon Thames (RBKT).
The designers seek to mitigate the Proposed Development’s impact on climate change and to
reduce its carbon dioxide (CO2) emissions by following the principles set out in the Mayor’s Energy
Hierarchy described in Policy 5.2 – Climate Change Mitigation of The London Plan.
The Energy Strategy will take into account environmental, architectural, and spatial constraints and
identify how the design of the Proposed Development will respond to CO2 emissions reduction
targets through the consideration of potential passive design measures, energy efficiency, and Low
and Zero Carbon (LZC) technologies.
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PROPOSED DEVELOPMENT DESCRIPTION
The Proposed Development is located within the former Toby Jug and MOD office site. See
Appendix A for the site plan of the Proposed Development.
The proposed development is located at King George’s Gate in Kingston Road, Tolworth and refers
to a hybrid planning application (part full/part outline) seeking the redevelopment of the site to
provide a residential-led mixed-use development within a series of buildings ranging from 3 to 18
2
storeys comprising 705 dwellings (Use Class C3), A1/A3/D1/D2/B1 uses (including a 262 m
convenience store, a doctor’s surgery and day nursery), an energy centre, bus interchange area and
approximately 350 car parking spaces.
The top of the apartment blocks would allow for the provision for roof top plant space as well as
renewable generation technology.
Figure 2-1 shows the visualisation of the Proposed Development courtesy of Collado Collins
Architects.
Figure 2-1: Visual Representation of the Proposed Development
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PLANNING CONTEXT
This assessment was carried out in line with local, regional and national planning requirements
which encourage that passive design, energy efficiency measures, low carbon and renewable
energy technologies be incorporated into the building design of all new developments. Policies
relevant to the Proposed Development include:
National Policy
3.1
Rising international and national aspirations have led to the strengthening of national planning
policies and building control processes that contribute to the Government’s long-term commitment to
support sustainable development.
The Government has launched a raft of measures to combat global warming and climate change.
The following publications demonstrate a timeline for the measures that have been implemented
within the development of national policy:
•
The Department of Transport and Industry White Paper entitled Our Energy Future –
Creating a Low Carbon Economy, 2003, sets a target for 10% of electricity to be produced
from renewable sources nationally by 2010 and twice this by 2020, with a 60% reduction in
CO2 emissions by 2050;
•
Sustainable and Secure Buildings Act 2004 sets out the purposes for which Building
Regulations may be made to further the conservation of fuel and power, ensure water use
efficiency, protect and enhance the environment, and prevent/detect non-compliance with
the Building Regulations;
•
Climate Change and Sustainable Energy Act 2006, enhances the contribution of the UK to
combating climate change, alleviating fuel poverty and securing a diverse and viable longterm energy supply;
•
The department for Communities and Local Government (CLG)’s Building A Greener Future:
Towards Zero Carbon Development, 2006, demonstrates the step change required in the
Building Regulations to achieve zero carbon housing in order to ensure energy security,
which is a risk of climate change;
•
The Department of Transport and Industry White Paper entitled Meeting the Energy
Challenge, 2007, sets out the UK strategy, which recognises the need to tackle climate
change and energy security;
•
The Climate Change Act 2008 sets up a framework for the UK to achieve its long-term goals
of reducing greenhouse gas emissions by 34% over the 1990s baseline by 2020 and by 80%
by 2050 and to ensure steps are taken towards adapting to the impact of climate change.
The Act introduces a system of carbon budgeting which constrains the total amount of
emissions in a given time period, and sets out a procedure for assessing the risks of the
impact of climate change for the UK, and a requirement on the Government to develop an
adaptation programme;
•
The Planning and Energy Act 2008 enables local planning authorities to set requirements for
energy use and energy efficiency in local plans;
•
The Carbon Plan, 2011, sets out the Government's plans for achieving the emissions
reductions committed to in the Climate Change Act, on a pathway consistent with meeting
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the 2050 target. This publication brings together the Government's strategy to curb
greenhouse gas emissions and deliver our climate change targets, as well as the updated
version of actions and milestones for the next five years;
•
The National Planning Policy Framework, 2012, sets out the Government’s planning policies
for England and how these are expected to be applied. It must be taken into account in the
preparation of local and neighbourhood plans, and is a material consideration in planning
decisions. The document presents a series of policies that constitute the Government’s view
of what sustainable development in England means in practice for the planning system. At
the heart of the National Planning Policy Framework is a presumption in favour of
sustainable development. Policies in Local Plans should follow the approach of the
presumption in favour of sustainable development so that it is clear that development which
is sustainable can be approved without delay; and
•
The Energy Act 2013 makes a provision for the setting of a decarbonisation target range and
duties in relation to it and for the reforming of the electricity market for purposes of
encouraging low carbon electricity generation and ensuring security of supply.
3.2
Regional Policy
3.2.1
The London Plan 2011 (Early Minor Alterations, October 2013)
The London Plan, which establishes policy over the next 20 – 25 years, retains the fundamental
objective of accommodating London’s population and economic growth through sustainable
development.
In terms of Climate Change Mitigation, Policy 5.1 of The London Plan includes a strategic target to
achieve an overall reduction in London’s CO2 emissions of 60% by 2025.
Policy 5.2: Minimising CO2 emissions sets out that the Mayor expects that all new developments will
fully contribute towards the reduction of CO2 emissions.
Specifically, Policy 5.2 (A) requires developments to make the fullest contribution to minimising
emissions of CO2 in accordance with the Mayor’s Energy Hierarchy:
•
Be Lean: use less energy;
•
Be Clean: supply energy efficiently; and
•
Be Green: use renewable energy.
Policy 5.2 (B) includes targets for CO2 emissions reduction which all major developments are
expected to meet. The previous target was a 40% reduction compared to 2010 Building Regulations
requirements. The current target (2013-2016) is a 35% reduction compared to 2013 Building
Regulations requirements. Note that this is an updated target in relation to the new 2013 Building
Regulations. Further information can be found in the Sustainable Design and Construction
Supplementary Planning Guidance (2014) and the Energy Planning – Greater London Authority
Guidance on Preparing Energy Assessment (2014) documents detailed in the following sections.
Policy 5.2(C) states that all major development proposals are expected to include a detailed energy
assessment to demonstrate how these targets are to be met within the framework of the Mayor’s
Energy Hierarchy (guidance is also given in Policy 5.2(D) on the content of Energy Assessments).
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Policy 5.3: Sustainable Design and Construction, seeks to ensure future developments meet the
highest standards of sustainable design and construction including construction and operation, and
ensure that they are considered at the beginning of the design process.
Policy 5.6 Decentralised Energy states that development proposals must evaluate the feasibility of
installing a Combined Heat and Power (CHP) system, and where a new CHP system is appropriate
also examine opportunities to extend the system beyond the site boundary to adjacent sites.
Policy 5.6 (B) also requires the developments to select the energy systems in accordance with the
following hierarchy:
•
Connection to existing heating or cooling networks;
•
Site-wide CHP network; and
•
Communal heating and cooling.
Policy 5.6 (C) states that where future network opportunities are identified, proposals should be
designed to connect to these networks.
Policy 5.7: Renewable Energy expects that within the framework of the energy hierarchy, major
development proposals will provide a reduction in CO2 emissions through the use of on-site
renewable energy generation. The London Plan also includes a presumption that all major
development proposals will seek to reduce CO2 emissions by at least 20% through the use of on-site
renewable energy generation, wherever feasible.
Policy 5.8 Innovative Energy Technologies supports the use of alternative energy technologies.
Policy 5.9: Overheating and Cooling expects major development proposals to reduce potential
overheating and reliance on air conditioning systems and demonstrate this in accordance with the
recommended cooling hierarchy:
1. Minimise internal heat generation through energy efficient design;
2. Reduce the amount of heat entering a building in summer through orientation, shading,
albedo, fenestration, insulation and green roofs and walls;
3. Manage the heat within the building through exposed internal thermal mass and high
ceilings;
4. Passive ventilation;
5. Mechanical ventilation; and
6. Active cooling systems (ensuring they are the lowest carbon options).
3.2.2
Sustainable Design and Construction Supplementary Planning
Guidance (2014)
In April 2014 the Mayor published the Sustainable Design and Construction Supplementary Planning
Guidance (SPG) to provide guidance to developers. This SPG details the Mayor’s standards,
covering a wide range of sustainability measures that major developments are expected and
encouraged to meet.
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Notably, the SPG responds to the introduction of the new Building Regulations Approved Document
L (ADL) 2013, which requires an overall 6% reduction in CO2 emissions from new residential
buildings and an average 9% reduction in CO2 emissions from new non-residential buildings
compared to ADL of the Building Regulations 2010. To avoid complexity and extra costs for
developers, the Mayor adopted a flat CO2 improvement target beyond ADL 2013 of 35% for both
residential and non-residential developments. This target replaces the previous targets set out under
the London Plan Policy 5.2 (B) against ADL 2010.
3.2.3
Delivering London’s Energy Future: The Mayor’s Climate Change
Mitigation and Energy Strategy (2011)
The Strategy sets out the Mayor’s strategic approach to limiting further climate change and securing
a low carbon energy supply for London.
To limit further climate change impacts the Mayor has set a target to reduce London’s CO2
emissions by 60% on 1990 levels by 2025. The Strategy details the programmes and activities that
are on-going across London to achieve this.
3.2.4
Energy Planning – Greater London Authority Guidance on
Preparing Energy Assessment (2014)
This guidance provides details on how to address the Mayor’s Energy Hierarchy through the
provision of an energy assessment to accompany strategic planning applications. This Energy
Statement report follows the methodology outlined in this guidance.
As also outlined in the Sustainable Design and Construction SPG, from 6 April 2014 the Mayor will
apply a 35% reduction target beyond ADL 2013 of the Building Regulations.
3.2.5
London Heat Network Manual (2014)
The London Heat Network Manual was published in April 2014 and provides guidance for
developers, network designers and planners with the aim of creating a consistent framework for
delivering efficient, interconnecting, District Heating (DH) networks. The document supports a range
of initiatives provided by City Hall to promote the Mayor's target to achieve 25% of London’s energy
supply from decentralised energy sources by 2025.
3.2.6
Integrating Renewable Energy into New Developments: Toolkit for
Planners, Developers and Consultants (2004)
New developments are expected to be assessed using procedures set out in this publication. This
document provides a review of the planning context, guidance on feasibility studies, case studies
and cost models for a wide range of applications.
3.3
Local Planning Policy
The Kingston Council manages the growth and development of the borough through a set of
planning policy documents known as the 'Local Development Framework' (LDF). The LDF is used to
guide development and change in the Borough over the next 15 years and is made up of the
Development Plan Documents (DPDs), with the Core Strategy being the main development plan
document.
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Adopted Core Strategy (2012)
3.3.1
The RBKT Core Strategy was adopted in April 2012 and includes both strategic and Development
Management policy guidance. The Core Strategy development plan document is a plan for the future
of the RBKT. No separate Development Management DPD is proposed.
According to Policy CS 1 – Climate Change Mitigation, the Council will ensure that all developments
are designed and built to make the most efficient use of resources, reduce its lifecycle impact on the
environment and contribute to climate change mitigation and adaptation by:
•
reducing CO2 emissions during construction and throughout the lifetime of the development;
•
building to the highest sustainable design and construction standards;
•
minimising water consumption;
•
using sustainable materials;
•
reducing levels of pollution; air, water, noise and light; and
•
planning for increased flood risk.
Based on Policy DM 2 – Low Carbon Development the Council will consider all applications for
independent renewable energy installations favourably, subject to other Core Strategy policies. The
development of energy generating infrastructure will be fully encouraged by the Council providing
that any opportunities for generating heat simultaneously with power are fully exploited.
The Council will furthermore seek to develop District Heating Networks in the following areas
identified as being suitable for the establishment of a combined heat and power network:
•
The Hogsmill Valley Area;
•
Kingston Town Centre; and
•
Tolworth Regeneration Area.
Where relevant, development proposals in these areas should undertake the following when a
District Heating Network is:
•
Not in place – Major developments should undertake a detailed investigation into the
feasibility of establishing a District Heating Network with the Proposed Development as an
anchor heat load or contribute towards such feasibility work.
•
Planned – make all reasonable efforts to ensure the Proposed Development will be
designed to connect to the planned District Heating Network without any major changes to
the development. When the network is in place, the development should be connected,
unless it can be demonstrated that there is insufficient heating demand for an efficient
connection.
•
Present – connect to the District Heating Network and make all reasonable attempts to
connect existing developments in the vicinity to the network, unless it can be demonstrated
that connection of existing developments will not result in CO2 savings.
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Kingston Town Centre Area Action Plan (2008)
3.3.2
This Area Action Plan (AAP) (2008) for Kingston town center is part of the Council’s emerging LDF
for the borough, as set out in the Local Development Scheme (LDS). It sets out planning policy for
Kingston town center over the period to 2020 and on adoption it will form part of the statutory
development plan for the borough.
Policy K7 – Housing calls for new housing that should meet Lifetime Home (or subsequent)
standards and incorporate renewable energy and sustainable construction techniques.
Policy K9 – Design Quality in the Town Centre requires the highest standard of design in all new
development and proposals should:
•
Make best use of redevelopment opportunities;
•
Create high quality landscaped spaces and connections to surrounding streets; and
•
Incorporate best environmental practice in design and layout, use sustainable construction
techniques and renewable technology, appropriate to the type and scale of development.
Kingston Plan – Our vision for 2020 (2009)
3.3.3
The priorities for the Kingston Strategic Partnership are set out in the borough wide Community Plan
– the Kingston Plan.
Long term goals include:
•
The reduction of the borough’s CO2 emissions to contribute to national targets and reduce
United Kingdom (UK) net CO2 emissions by 26 - 32% by 2020 and 80% by 2050;
•
The reduction of the Ecological Footprint; and
•
Meeting the energy hierarchy by reducing energy use, using energy efficiently, using
renewable / clean energy and producing 10% renewable energy on new build developments.
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ASSESSMENT METHODOLOGY
4
The overall strategy and measures identified to reduce the regulated energy consumption and
associated CO2 emissions of the Proposed Development reflect the Greater London Authority’s
(GLA’s) energy hierarchy and include the following:
•
Passive design and energy efficiency (i.e. Be Lean’);
•
Energy efficient supply of services (i.e. ‘Be Clean’); and
•
On-site renewable energy technologies to provide energy where appropriate (i.e. ‘Be
Green’).
Generally, this is applied to a development as follows:
•
Calculation of the ADL 2013 compliant regulated baseline energy demand and associated
CO2 emissions;
•
Determination of the most appropriate energy efficiency and passive design measures.
These are then incorporated into the energy calculations, representing an enhanced
baseline (‘Be Lean’) scheme. The ‘Be Lean’ scheme represents one of the most effective
ways of reducing the energy consumption;
•
Identification of clean energy supply technologies (e.g. CHP and/or DH Network) and
incorporation to the energy calculations, representing a ‘Be Clean’ scheme;
•
Identification of the most appropriate ‘Be Green’ renewable energy technologies, where
feasible, to reduce the CO2 emissions of the development and contributing towards wider
CO2 emission reduction targets through on-site renewable sources.
The regulated energy consumption and associated CO2 emissions of the residential elements of the
Proposed Development have been calculated using the Standard Assessment Procedure (SAP) to
conduct preliminary Building Regulations ADL 1A 2013 compliance testing of the residential
development.
The baseline regulated and unregulated CO2 emissions of the non-domestic elements of the
Proposed Development have been estimated using benchmarks such as CIBSE Guide F and
previous modelling experience.
The whole energy use of the Proposed Development is considered in this energy strategy. This
includes Building Regulations ADL energy uses (i.e. hot water, space heating, space cooling and
lighting) and additional non-regulated energy uses such as appliances, computers, etc.
Energy uses which fall outside the remit of the Building Regulations were estimated using BREDEM
2012 and CIBSE Guide F.
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BASELINE ASSESSMENT
In order to assess the potential CO2 emissions reductions achievable at the site through the
implementation of passive design, energy efficiency measures and on-site LZC technologies, the
baseline CO2 emissions of the Proposed Development designed without such undertakings must be
estimated.
This Energy Strategy considers, as the starting point, a baseline development that meets the
requirements of Building Regulations ADLA 2013 in relation to CO2 emissions (i.e. the Dwelling
Emissions Rate (DER) of the baseline is equal to the Target Emissions Rate (TER), which is the
maximum emission rate permitted by the Building Regulations).
The TER worksheet of a sample unit from the approved software used is included in Appendix B.
A summary of the estimated baseline energy consumption for regulated and unregulated energy
uses is shown in Table 5-1.
Table 5-1: Estimated Baseline Energy Consumption of the Proposed Development
ESTIMATED BASELINE ENERGY CONSUMPTION
Baseline Scheme
Residential units
Non-residential units
Proposed Development
Total Regulated Energy Uses
(MWh/year)
Total Unregulated Energy Uses
(MWh/year)
3,241
420
186
90
3,427
510
A summary of estimated baseline CO2 emissions for regulated and unregulated energy uses is
shown in Table 5-2.
Table 5-2: Estimated Baseline CO2 Emissions of the Proposed Development
ESTIMATED BASELINE CO2 EMISSIONS
Total Regulated Energy Uses
(Tonnes CO2/year)
Total Unregulated Energy Uses
(Tonnes CO2/year)
Residential units
787
218
Non-residential units
69
47
Proposed Development
856
265
Baseline Scheme
ENERGY STRATEGY
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March 2015
BE LEAN – PASSIVE DESIGN AND ENERGY EFFICIENCY
APPRAISAL
6
The objective of this section is to identify and consider potential opportunities to reduce the CO2
footprint of the Proposed Development through identification of passive design and energy efficiency
measures.
Minimising solar gains
6.1
In line with Policy 5.9 of the London Plan, potential for overheating and reliance on air conditioning
systems will be reduced by following the Mayor’s cooling hierarchy, i.e.:
1. minimise internal heat generation through energy efficient design
2. reduce the amount of heat entering the buildings in summer
3. manage the heat within the building
4. use passive ventilation
5. use mechanical ventilation
6. provide energy efficient cooling system
The following measures were introduced in order to limit the effects of solar gains in summer:
•
reduce internal heat generation by specifying low energy lighting;
•
incorporation of high performance glass throughout the scheme to minimise solar gains in
summer whilst providing adequate daylighting levels for occupants; and
•
designing balconies that work as overhangs to provide shading to the units below during the
summer months without altering the daylight penetration in the mid-season and heating
period.
The dwellings have been modelled under the SAP methodology and tested against criteria set in
SAP Appendix P: Assessment of internal temperature in summer. The tested dwellings have shown
to comply with the criteria as described in Appendix P, achieving a low propensity for high internal
temperatures.
Due to the development being located in between a highway with heavy traffic and the railway
tracks, high levels of ambient noise are expected and thus the use of natural ventilation via openable
windows is limited. Therefore, mechanical ventilation (MVHR) will be introduced in the residential
areas. Variable speed drives and best practice values of Specific Fan Power (SFP) will be specified.
6.2
Passive Design and Energy Efficiency Measures
With regards to the commercial units, a number of passive design and energy efficiency measures
have been considered at design stage. However, most of them had to be discounted for various
reasons. Generally, the commercial units once sectioned will not be deemed large enough to warrant
any of the Passive Cooling technologies. In summary:
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March 2015
•
Thermal mass: Current Building Regulations & modern methods of construction do not lend
to high thermal mass structures in commercial buildings therefore night time cooling is not
considered necessary.
•
Ground coupled air cooling and ground water cooling: Both technologies are considered
to be too expensive for the small units to support. In addition, there is limited free ground to
install. Surface water cooling is also deemed not viable as there is no local water source to
utilise.
•
Displacement ventilation: The commercial buildings internal layout does not support
feasibility of any displacement ventilation this in this scheme.
•
Evaporative cooling, direct or indirect: This technology may be considered in fit out
depending on commercial building cooling requirements.
•
Absorption and evaporative cooling using waste heat: None of these technologies is
considered viable due to the proximity of the commercial buildings being located away from
the plant room causing inefficient transportation for a central cooling system to the
commercial buildings.
Table 6-1 lists the passive design and energy efficiency measures which have been incorporated in
the design of the building.
Table 6-1: Proposed Passive Design and Energy Efficiency Measures
PROPOSED PASSIVE DESIGN AND ENERGY EFFICIENCY MEASURES
Technology
Fabric Design
Method of CO2 Reduction
Improved U-values of the thermal elements (wall, floor and roof)
where feasible and controlled fittings (windows and doors) over the
minimum Building Regulations ADLA 2013 requirements.
The proposed U-values are included in Appendix B.
Thermal Bridging
Thermal bridging must be assessed as part of the architectural design
ensuring that an overall psi-value, for each dwelling, of less than 0.08
W/mK is achieved to assist in reducing heat loss and improve energy
performance.
Building Envelope
Improved building air-tightness beyond the Building Regulations
ADLA 2013 minimum requirements.
Promoting Natural Daylight
Natural lighting promoted thorough the design to reduce the energy
use and CO2 emissions of the building by minimising the use of
artificial lighting.
Home User Guide
Provision of a Home User Guide to residents advising on how to use
the home efficiently (in line with the CfSH requirements).
Efficient Lighting
Energy efficient lights will be introduced, to reduce energy
consumption.
Efficient Heating,
Ventilation and Air
Thermal comfort in the flats maintained via high efficiency MVHR
units. Fan speed control will be specified to match air supply rates,
ENERGY STRATEGY
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Buildings & Places
Conditioning (HVAC)
Systems
Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
March 2015
where feasible alongside improved SFP for mechanically ventilated
areas.
Efficient individual gas fired boilers will provide space heating and
domestic hot water for the 26 townhouses.
Metering
Energy metering of the individual residences and the central plant
room. The data will be collated and warning alarms will be provided
via the BMS when equipment exceeds identified limits (e.g. plant
operating out of hours) to enable the facilities management team to
switch off unnecessary equipment.
Proposed ‘Be Lean’ Scheme
6.3
The ‘Be Lean’ scheme includes the incorporation of energy efficiency and passive design measures
into the baseline scheme. Appendix B includes DER worksheet taking into account passive design
and energy efficiency measures.
Table 6-2 demonstrates CO2 emissions associated with regulated energy uses of the development
and expected percentage CO2 emissions savings achieved through the incorporation of the
proposed passive design and energy efficiency measures.
The results of the calculations illustrate that the proposed energy efficiency and passive design
measures alone would reduce the Proposed Development’s regulated baseline CO2 emissions by
circa 7%.
Table 6-2: Estimated regulated CO2 emissions of Baseline and Be Lean scheme
ESTIMATED REGULATED CO2 EMISSIONS
Use
Proposed Development
Baseline
(Tonnes CO2/year)
‘Be Lean’
(Tonnes CO2/year)
Improvement over
Baseline
856
796
7%
ENERGY STRATEGY
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Buildings & Places
7
7.1
Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
March 2015
BE CLEAN – LOW CARBON TECHNOLOGY APPRAISAL
Introduction to Be Clean Technologies
This section considers the potential for connection to any existing or proposed DH network in the
proximity of the site and the feasibility of incorporating a CHP/Combined Cooling Heat and Power
(CCHP) plant on-site.
A DH network is a system for distributing heat generated in a centralised location. The energy centre
serving the area often includes a CHP plant.
CHP technology effectively uses waste heat from the electricity generation process to provide useful
heat for space and water heating; the advantage of this system is that it leads to higher system
efficiencies when compared to a typical supply arrangement of grid-imported electricity and
conventional gas fired boilers. CHP is considered a low carbon technology when fired by natural gas
to generate electricity and provide heating and hot water.
The following three options have been considered for the Proposed Development:
1. connecting to existing heating or cooling networks;
2. site wide CHP network; and
3. combined heating, cooling and power (CCHP).
7.2
Applicability to the Proposed Development
7.2.1
Connection to Existing District Heating Schemes
1
2
Based on the data included in the London Heat Map , DECC CHP database and the CHPA district
3
heating database , there are no existing CHP installations or DH networks near to the proposed site.
See Appendix C for further details.
During the planning application consultation process, another residential development in the vicinity
of the Proposed Development has been identified. This development at Tolworth Towers,
approximately 200m from the site, could be either a supplier or consumer of heat to or from a DHN.
The developer and energy consultant for Tolworth Towers have been approached to identify their
plans for the development. The extract below is taken from the correspondence between AECOM
and the Tolworth Towers energy consultant.
“In considering a DHN to connect Tolworth Towers to the former Toby Jug site; there are lots of
physical barriers to creating this and very little potential given the established nature of the
surrounding area. It is unlikely to be either technically or economically feasible to create such a
DHN.” See Appendix D for full correspondence.
In conclusion we do not believe that a DHN to link the two sites together is either financially or
technically viable.
1
2
3
London Heat Map available: http://www.londonheatmap.org.uk/Mapping.
CHP database published by DECC: http://chpdb.chpfocus.co.uk/reporting/index/viewtable/token/2.
CHPA district heating database: http://www.chpa.co.uk/installation-map_790.html
ENERGY STRATEGY
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Buildings & Places
7.2.2
March 2015
On-site site-wide CHP opportunities
CHP systems offer optimum CO2 and cost savings only when matched to the site electricity and heat
load profiles; a building with high heat and electricity demand means a CHP system with a high
utilisation and makes a realistic contribution to the site’s annual energy demands and CO2 savings.
In line with The London Plan Policy 5.6, an on-site CHP option has been considered for the
Proposed Development. A CHP unit, together with necessary ancillary equipment located in a plant
room, could supply the space heat and domestic hot water (DHW) demands of the buildings. The
proposed location of the plant room is shown in Appendix E and the plant room layout in Appendix F.
The CHP plant size has been selected both to ‘follow’ the site heat profile – thereby maximising the
contribution to heat – and to prevent any significant electrical export or heat rejection. Based on the
annual hourly operational modelling, a gas fired reciprocating engine CHP of approximately 185 kW e
is considered feasible for the site-wide development.
The use of a thermal store is also proposed for the development, which will allow the CHP engine to
operate more continuously over the year, to extend CHP running hours and to ‘smooth’ the demand
against which the CHP would operate. The system will be hydraulically designed and connected to
the thermal store, and the CHP would act as the lead boiler.
The commercial units shall also be provided with Low Temperature Hot Water (LTHW) from the
district heating mains, serving radiators. There will be sufficient capacity in this to allow limited
domestic hot water production, however there will also be provision for VRF heating / cooling to be
installed as part of the fit out.
The 26 townhouses located on the southwest part of the site are going to be supplied with heat by
individual boilers. These units are located circa 200m from the proposed central gas boiler room. At
this distance the capital cost associated with the installation of interconnecting pipework makes such
a connection currently unviable compared to alternative solutions.
Table 7-1 shows the estimated heat and DHW demand of the Proposed Development.
Table 7-1: Estimated Heat and DHW Demand
ESTIMATED SPACE HEATING AND DHW DEMAND
Use
Proposed Development
7.2.3
Heating demand (MWh)
DHW demand (MWh)
563
1,834
Combined Cooling, Heat and Power technology
A CCHP system is a CHP system with the inclusion of absorption chillers (i.e. chillers driven by heat)
to provide space cooling from the CHP waste heat recovery system. This can allow the CHP system
to function effectively through the summer period when space heating requirements are low.
However, absorption chillers require extensive heat rejection and can significantly increase capital
costs compared to a CHP system. In addition, the cooling loads of the Proposed Development are
considered minimal for a CCHP system.
Due to the relatively low cooling loads associated with the Proposed Development, the installation of
a CCHP is not considered appropriate for the Proposed Development.
ENERGY STRATEGY
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Buildings & Places
March 2015
Proposed ‘Be Clean’ Scheme
7.3
Based on the feasibility analysis described in the previous sections, it is proposed that the majority of
the space heating and hot water demand of the Proposed Development will be provided via a sitewide CHP.
Table 7-2 shows the CO2 emissions associated with the development and the anticipated
percentage CO2 emissions savings over the ‘Be Lean’ case.
The results of the calculations illustrate that the proposed connection would reduce the Proposed
Development’s regulated CO2 emissions by circa 20% over ‘Be Lean’ scheme.
Appendix B includes SAP worksheet of the ‘Be Clean’ scheme.
Table 7-2: Estimated Baseline, Be Lean and Be Clean CO2 Emissions
ESTIMATED REGULATED CO2 EMISSIONS
Use
Proposed
Development
Baseline
(Tonnes
CO2/year)
‘Be Lean’
(Tonnes
CO2/year)
‘Be Clean’
(Tonnes
CO2/year)
Improvement
over the ‘Be
Lean’ case
856
796
640
20%
ENERGY STRATEGY
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BE GREEN - RENEWABLE ENERGY TECHNOLOGIES
8
In line with the planning policies, consideration has been given to the inclusion of renewable energy
technologies within the Proposed Development.
The renewable energy technology, which has been found feasible for the Proposed Development, is
included in the following section. Site specific analysis for those technologies not considered
feasible, is included in Appendix G.
Photovoltaic (PV) Arrays
8.1
Photovoltaic (PV) Cell technology involves the conversion of the sun’s energy into electricity. Roofmounted PV technology is regarded as a viable opportunity for the Proposed Development.
Based on the shading analysis completed for the Proposed Development, a total PV area of circa
2
1,140 m (178 kWp) can be incorporated on the roof of the buildings to contribute towards the
emission reduction requirements set in the local and regional policies. The PVs will be supplying the
residential units and are assumed to be connected to the landlord areas associated with the
dwellings.
The proposed PV panels would generate circa 126 MWh annually and would allow approximately 66
tonnes of CO2 annual reduction in regulated CO2 emissions to be achieved; estimated over the ‘Be
Clean’ scheme. This is equal to circa 10% reduction in CO2 emissions.
Appendix H includes the proposed roof layout of the development.
Proposed ‘Be Green’ Scheme
8.2
The ‘Be Green’ scheme includes the incorporation of PVs into the ‘Be Clean’ scheme.
The CO2 emissions savings achievable through the incorporation of renewable energy technologies
only are 66 tonnes per annum, which corresponds to a 10% reduction over the ‘Be Clean’ scheme.
In total, the results of the analysis show that a reduction in regulated CO2 emission of 281 tonnes per
annum over the Building Regulations ADLA 2013 compliant baseline can be achieved, representing
a 33% reduction.
A summary of the estimated CO2 emissions associated with each stage of the Mayor’s Energy
Hierarchy and the percentage improvement over the Be Lean scheme is shown in Table 8-1.
Table 8-1: Estimated Baseline, Be Lean and Be Green CO2 Emissions
ESTIMATED REGULATED CO2 EMISSIONS
Use
Proposed
Development
Baseline
(Tonnes
CO2/year)
‘Be Lean’
(Tonnes
CO2/year)
‘Be Clean’
(Tonnes
CO2/year)
‘Be Green’
(Tonnes
CO2/year)
Improvement
over the ‘Be
Lean’
856
796
640
575
28%
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Buildings & Places
March 2015
CONCLUSIONS
9
Whilst reducing energy consumption and associated CO2 emissions to the atmosphere, the heating,
cooling and electrical demands of the Proposed Development will be met.
From the analysis, the following energy strategy has been identified for the Proposed Development:
•
energy efficiency and passive design measures, with associated savings in CO2 emissions
of 61 tonnes over the baseline scheme;
•
incorporation of a CHP unit that will supply the majority of the heating and DHW demand of
the Proposed Development with anticipated CO2 savings of circa 155 tonnes over the ‘Be
Lean’ scheme; and
•
installation of approximately 1,140 m of PV arrays, which will generate circa 126 MWh of
electricity annually, achieving a further reduction in CO2 emissions of 66 tonnes.
2
In total, the proposed strategy would reduce the regulated CO2 emissions of the Proposed
Development by circa 33% over the baseline.
The proposed LZC technologies (i.e. CHP and PVs) can reduce the CO2 emissions of the new
building by 28% over the ‘Be Lean’ scheme.
Table 9-1 and Figure 9-1 present the estimated regulated and unregulated CO2 emissions after each
stage of the Mayor’s Energy Hierarchy.
Table 9-1: Estimated Regulated and Unregulated CO2 Emissions after Each Stage of the Mayor’s
Energy Hierarchy
ESTIMATED CO2 EMISSIONS (TONNES PER ANNUM)
Regulated CO2 Emissions
Unregulated CO2 Emissions
Building Regulations ADLA 2013
Compliant Baseline
856
265
After energy demand reduction
796
265
After low carbon technology
640
265
After renewables
575
265
Assessment
ENERGY STRATEGY
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Buildings & Places
Energy Efficiency
Measures
DH/CHP
March 2015
Renewable
Energy (PV)
900
800
7%
Total Regulated CO2 Emissions (tonnes) p.a
7%
700
25%
600
25%
33%
500
400
300
200
100
0
Be Lean
Be Clean
Building Regs 2013 Target Emissions Rate
Be Green
London Plan 2013 Target
Figure 9-1: Summary of Estimated Site-wide Regulated CO2 Reduction for Each Stage of the
Mayor’s Energy Hierarchy
Table 9-2 presents the summary of estimated regulated CO2 savings achievable over the baseline
for each stage of the Mayor’s Energy Hierarchy.
ENERGY STRATEGY
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Buildings & Places
March 2015
Table 9-2: Estimated Regulated CO2 Emission Savings from Each Stage of the Mayor’s Energy
Hierarchy
ESTIMATED REGULATED CO2 EMISSIONS SAVINGS
Assessment
Tonnes CO2 Per Annum
(%)
Savings from energy demand
reduction (over Baseline)
61
7%
Savings from low carbon
technology (CHP) (Over ‘Be Lean’)
155
20%
Savings from renewable
technology (Over ‘Be Clean’)
66
10%
Total cumulative savings for the
site (Over Baseline)
282
33%
Total Target Savings
300
35%
Annual Shortfall
18
-
The individual percentage savings shown in Table 9-2 and Figure 9-1 are a reduction from each
stage of the Mayor’s Energy Hierarchy. The total cumulative savings for the Proposed Development
represent the total reduction over the baseline (281 tonnes of CO2 savings against the baseline of
856 tonnes CO2 per year equating to 33%).
The potential CO2 emissions savings achievable by the Proposed Development have been
maximised via incorporation of passive design and energy efficiency measures. In addition, the
application site’s potential for installation of renewable technologies has been fully utilised.
The proposed strategy including Solar PV and CHP is considered feasible at this time. A review of
the proposed strategy will be undertaken prior to detailed design to take into account the rapid pace
of product innovation and development in this sector. This approach aims to capture the most
appropriate and advantageous solution at time of construction.
It is therefore concluded that the 35% target in Policy 5.2 of The London Plan cannot feasibly or
viably be met on-site.
In summary, the main constraints associated are as follows:
•
high levels of traffic and ambient noise constraining the use of natural ventilation via
openable windows;
•
the location of the application site in a dense urban environment with low average wind
speed constraining the installation of wind turbines; and
•
the location of the application site in an air quality management area for NO2 and Particulate
Matter PM10, limiting the possibilities of utilisation of biomass technologies.
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APPENDIX A – SITE PLAN
ENERGY STRATEGY
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APPENDIX B – ENERGY DEMAND ASSESSMENT
Output files included below:
•
TER worksheet
•
DER after ‘Be Lean’ worksheet
•
DER after ‘Be Clean’ worksheet
•
DER after ‘Be Green’ worksheet
ENERGY STRATEGY
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28
TER Worksheet
Design - Draft
This design submission has been carried out using Approved SAP software. It has been prepared from plans and specifications and may not reflect the
property as constructed.
Assessor name
Dr Eric Roberts
Client
Address
Assessor number
3679
Last modified
28/11/2014
1 2b 4P Hook Rise, Tolworth, London, KT6
1. Overall dwelling dimensions
Area (m²)
80.00
Total floor area
(1a)
x
2.60
Volume (m³)
(2a)
=
T
Lowest occupied
Average storey
height (m)
(1a) + (1b) + (1c) + (1d)...(1n) =
80.00
Dwelling volume
(3a)
208.00
(5)
(4)
(3a) + (3b) + (3c) + (3d)...(3n) =
2. Ventilation rate
208.00
m³ per hour
0
x 40 =
0
(6a)
Number of open flues
0
x 20 =
0
(6b)
Number of intermittent fans
3
x 10 =
30
(7a)
Number of passive vents
0
x 10 =
0
(7b)
Number of flueless gas fires
0
x 40 =
0
(7c)
DR
AF
Number of chimneys
Infiltration due to chimneys, flues, fans, PSVs
(6a) + (6b) + (7a) + (7b) + (7c) =
30
Air changes per
hour
÷ (5) =
0.14
(8)
Air permeability value, q50, expressed in cubic metres per hour per square metre of envelope area
5.00
(17)
If based on air permeability value, then (18) = [(17) ÷ 20] + (8), otherwise (18) = (16)
0.39
(18)
2
(19)
1 - [0.075 x (19)] =
0.85
(20)
(18) x (20) =
0.34
(21)
If a pressurisation test has been carried out or is intended, proceed to (17), otherwise continue from (9) to (16)
Number of sides on which the dwelling is sheltered
Shelter factor
Infiltration rate incorporating shelter factor
Infiltration rate modified for monthly wind speed:
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Monthly average wind speed from Table U2
5.10
5.00
4.90
4.40
4.30
3.80
3.80
3.70
4.00
4.30
4.50
4.70
(22)
1.25
1.23
1.10
1.08
0.95
0.95
0.93
1.00
1.08
1.13
1.18
(22a)
0.32
0.31
0.34
0.36
0.38
0.39
(22b)
Wind factor (22)m ÷ 4
1.28
Adjusted infiltration rate (allowing for shelter and wind factor) (21) x (22a)m
0.43
0.42
0.41
0.37
0.36
0.32
Calculate effective air change rate for the applicable case:
If mechanical ventilation: air change rate through system
N/A
(23a)
If balanced with heat recovery: efficiency in % allowing for in-use factor from Table 4h
N/A
(23c)
d) natural ventilation or whole house positive input ventilation from loft
0.59
0.59
0.58
0.57
0.56
0.55
0.55
0.55
0.56
0.56
0.57
0.58
(24d)
0.55
0.55
0.55
0.56
0.56
0.57
0.58
(25)
Effective air change rate - enter (24a) or (24b) or (24c) or (24d) in (25)
0.59
0.59
0.58
0.57
0.56
Page 1
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
3. Heat losses and heat loss parameter
Element
Gross
area, m²
Openings
m²
Net area
A, m²
U-value
W/m²K
A x U W/K
κ-value,
kJ/m².K
A x κ,
kJ/K
Window
17.99
x
1.33
=
23.85
(27)
Door
2.00
x
1.00
=
2.00
(26)
External wall
65.81
x
0.18
=
11.85
(29a)
Party wall
25.38
x
0.00
=
0.00
(32)
Roof
80.00
x
0.13
=
10.40
(30)
Total area of external elements ∑A, m²
165.80
(31)
Fabric heat loss, W/K = ∑(A × U)
(26)...(30) + (32) =
Heat capacity Cm = ∑(A x κ)
(28)...(30) + (32) + (32a)...(32e) =
Thermal mass parameter (TMP) in kJ/m²K
Thermal bridges: ∑(L x Ψ) calculated using Appendix K
Total fabric heat loss
(33) + (36) =
Feb
Mar
Apr
May
Ventilation heat loss calculated monthly 0.33 x (25)m x (5)
40.58
40.34
40.10
38.98
38.77
94.90
94.69
Heat transfer coefficient, W/K (37)m + (38)m
96.50
96.26
96.02
(33)
N/A
(34)
250.00
(35)
7.82
(36)
55.92
(37)
Jun
Jul
Aug
Sep
Oct
Nov
Dec
37.80
37.80
37.62
38.17
38.77
39.20
39.64
93.72
93.72
93.54
94.09
94.69
95.12
95.56
T
Jan
48.10
DR
AF
Average = ∑(39)1...12/12 =
94.90
(38)
(39)
Heat loss parameter (HLP), W/m²K (39)m ÷ (4)
1.21
1.20
1.20
1.19
1.18
1.17
1.17
1.17
1.18
1.18
1.19
Average = ∑(40)1...12/12 =
1.19
1.19
(40)
Number of days in month (Table 1a)
31.00
28.00
31.00
30.00
31.00
30.00
31.00
31.00
30.00
31.00
30.00
31.00
(40)
4. Water heating energy requirement
Assumed occupancy, N
2.46
(42)
Annual average hot water usage in litres per day Vd,average = (25 x N) + 36
92.69
(43)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
83.42
87.13
90.84
94.55
98.25
101.96
Hot water usage in litres per day for each month Vd,m = factor from Table 1c x (43)
101.96
98.25
94.55
90.84
87.13
83.42
∑(44)1...12 =
1112.32
(44)
Energy content of hot water used = 4.18 x Vd,m x nm x Tm/3600 kWh/month (see Tables 1b, 1c 1d)
151.21
132.25
136.47
118.97
114.16
98.51
91.28
104.75
106.00
123.53
134.85
∑(45)1...12 =
146.44
1458.42
(45)
Distribution loss 0.15 x (45)m
22.68
19.84
20.47
17.85
17.12
14.78
13.69
15.71
15.90
18.53
20.23
Storage volume (litres) including any solar or WWHRS storage within same vessel
21.97
(46)
150.00
(47)
1.39
(48)
Temperature factor from Table 2b
0.54
(49)
Energy lost from water storage (kWh/day) (48) x (49)
0.75
(50)
0.75
(55)
Water storage loss:
a) If manufacturer's declared loss factor is known (kWh/day)
Enter (50) or (54) in (55)
Water storage loss calculated for each month (55) x (41)m
23.33
21.07
23.33
22.58
23.33
22.58
23.33
23.33
22.58
23.33
22.58
23.33
(56)
22.58
23.33
22.58
23.33
(57)
If the vessel contains dedicated solar storage or dedicated WWHRS (56)m x [(47) - Vs] ÷ (47), else (56)
23.33
21.07
23.33
22.58
23.33
22.58
Page 2
23.33
23.33
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
Primary circuit loss for each month from Table 3
23.26
21.01
23.26
22.51
23.26
22.51
23.26
23.26
22.51
23.26
22.51
23.26
(59)
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
(61)
Combi loss for each month from Table 3a, 3b or 3c
0.00
0.00
0.00
Total heat required for water heating calculated for each month 0.85 x (45)m + (46)m + (57)m + (59)m + (61)m
197.80
174.33
183.06
164.07
160.75
143.60
137.88
151.35
151.09
170.13
179.94
193.03
(62)
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
(63)
143.60
137.88
151.35
151.09
170.13
179.94
193.03
Solar DHW input calculated using Appendix G or Appendix H
0.00
0.00
0.00
0.00
Output from water heater for each month (kWh/month) (62)m + (63)m
197.80
174.33
183.06
164.07
160.75
∑(64)1...12 =
2007.04
(64)
Heat gains from water heating (kWh/month) 0.25 × [0.85 × (45)m + (61)m] + 0.8 × [(46)m + (57)m + (59)m]
77.64
82.65
75.63
75.23
Jan
Feb
Mar
Apr
May
123.14
123.14
123.14
123.14
5. Internal gains
Metabolic gains (Table 5)
123.14
68.83
67.63
72.11
71.32
78.35
80.91
T
87.55
85.97
(65)
Jun
Jul
Aug
Sep
Oct
Nov
Dec
123.14
123.14
123.14
123.14
123.14
123.14
123.14
(66)
7.29
9.48
12.73
16.16
18.86
20.10
(67)
164.17
161.89
167.63
179.84
195.27
209.76
(68)
Lighting gains (calculated in Appendix L, equation L9 or L9a), also see Table 5
17.37
14.13
10.70
8.00
6.75
DR
AF
19.56
Appliance gains (calculated in Appendix L, equation L13 or L13a), also see Table 5
219.44
221.72
215.98
203.76
188.34
173.85
Cooking gains (calculated in Appendix L, equation L15 or L15a), also see Table 5
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
(69)
3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
(70)
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
(71)
115.54
111.09
105.05
101.12
95.59
90.90
96.92
99.05
105.31
112.38
115.55
(72)
325.30
331.23
342.35
364.26
389.44
408.35
(73)
Pump and fan gains (Table 5a)
3.00
Losses e.g. evaporation (Table 5)
-98.51
Water heating gains (Table 5)
117.68
Total internal gains (66)m + (67)m + (68)m + (69)m + (70)m + (71)m + (72)m
419.62
417.57
404.14
382.45
360.40
339.14
6. Solar gains
Access factor
Table 6d
Area
m²
Solar flux
W/m²
Gains
W
FF
specific data
or Table 6c
g
specific data
or Table 6b
SouthEast
0.77
x
4.70
x
36.79
x 0.9 x
0.63
x
0.70
=
52.85
(77)
NorthWest
0.77
x
3.13
x
11.28
x 0.9 x
0.63
x
0.70
=
10.79
(81)
SouthWest
0.77
x
2.54
x
36.79
x 0.9 x
0.63
x
0.70
=
28.56
(79)
NorthEast
0.77
x
7.62
x
11.28
x 0.9 x
0.63
x
0.70
=
26.28
(75)
Solar gains in watts ∑(74)m...(82)m
118.48
214.13
325.68
458.35
563.43
581.36
551.34
469.58
371.10
245.47
144.15
99.94
(83)
840.80
923.83
920.50
876.64
800.81
713.45
609.73
533.60
508.29
(84)
Total gains - internal and solar (73)m + (83)m
538.10
631.70
729.82
7. Mean internal temperature (heating season)
Temperature during heating periods in the living area from Table 9, Th1(˚C)
Jan
Feb
Mar
Apr
May
21.00
Jun
Page 3
Jul
Aug
Sep
Oct
Nov
(85)
Dec
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
Utilisation factor for gains for living area n1,m (see Table 9a)
1.00
0.99
0.98
0.93
0.81
0.62
0.46
0.53
0.79
0.96
0.99
1.00
(86)
20.85
20.97
20.99
20.99
20.90
20.54
20.08
19.72
(87)
Mean internal temp of living area T1 (steps 3 to 7 in Table 9c)
19.75
19.93
20.21
20.57
Temperature during heating periods in the rest of dwelling from Table 9, Th2(˚C)
19.91
19.92
19.92
19.93
19.93
19.94
19.94
19.94
19.94
19.93
19.93
19.92
(88)
0.91
0.75
0.53
0.36
0.41
0.71
0.94
0.99
1.00
(89)
19.94
19.94
19.86
19.41
18.75
18.23
(90)
Utilisation factor for gains for rest of dwelling n2,m
0.99
1.00
0.97
Mean internal temperature in the rest of dwelling T2 (follow steps 3 to 7 in Table 9c)
18.26
18.52
18.93
19.45
19.79
19.92
Living area fraction
Living area ÷ (4) =
0.38
(91)
Mean internal temperature for the whole dwelling fLA x T1 +(1 - fLA) x T2
18.82
19.05
19.41
19.87
20.19
20.32
20.34
20.33
20.25
19.83
19.25
18.79
(92)
(93)
18.82
19.05
19.41
19.87
20.19
20.32
20.34
20.33
20.25
19.83
19.25
18.79
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
0.99
0.97
0.91
0.77
0.56
0.40
0.45
0.73
0.94
0.99
1.00
(94)
705.86
761.60
709.66
519.63
347.85
363.70
524.14
574.02
526.97
505.93
(95)
11.70
14.60
16.60
16.40
14.10
10.60
7.10
4.20
(96)
535.60
350.09
367.94
578.88
873.95
1155.26
1393.85
(97)
0.00
0.00
0.00
0.00
223.15
452.37
660.62
8. Space heating requirement
Jan
Utilisation factor for gains, ƞm
DR
AF
0.99
T
Apply adjustment to the mean internal temperature from Table 4e where appropriate
Useful gains, ƞmGm, W (94)m x (84)m
534.86
623.43
Monthly average external temperature from Table U1
4.30
4.90
6.50
8.90
Heat loss rate for mean internal temperature, Lm, W [(39)m x [(93)m - (96)m]
1401.24
1361.87
1239.83
1040.96
803.58
Space heating requirement, kWh/month 0.024 x [(97)m - (95)m] x (41)m
644.59
496.23
397.27
201.14
69.87
∑(98)1...5, 10...12 =
Space heating requirement kWh/m²/year
(98) ÷ (4)
3145.24
(98)
39.32
(99)
0.00
(201)
1.00
(202)
0.00
(202)
9a. Energy requirements - individual heating systems including micro-CHP
Space heating
Fraction of space heat from secondary/supplementary system (table 11)
Fraction of space heat from main system(s)
1 - (201) =
Fraction of space heat from main system 2
Fraction of total space heat from main system 1
(202) x [1- (203)] =
1.00
(204)
Fraction of total space heat from main system 2
(202) x (203) =
0.00
(205)
93.50
(206)
Efficiency of main system 1 (%)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
215.13
74.73
0.00
0.00
0.00
0.00
238.66
483.82
706.54
Space heating fuel (main system 1), kWh/month
689.40
530.73
424.89
∑(211)1...5, 10...12 =
3363.90
(211)
Water heating
Efficiency of water heater
87.74
87.45
86.83
85.36
82.76
79.80
79.80
79.80
79.80
85.54
87.17
87.84
210.83
192.21
194.23
179.95
172.78
189.66
189.34
198.89
206.42
219.76
(217)
Water heating fuel, kWh/month
225.45
199.35
Page 4
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
∑(219a)1...12 =
2378.87
(219)
Annual totals
Space heating fuel - main system 1
3363.90
Water heating fuel
2378.87
Electricity for pumps, fans and electric keep-hot (Table 4f)
central heating pump or water pump within warm air heating unit
30.00
(230c)
boiler flue fan
45.00
(230e)
Total electricity for the above, kWh/year
75.00
(231)
Electricity for lighting (Appendix L)
345.45
(232)
6163.21
(238)
Total delivered energy for all uses
(211)...(221) + (231) + (232)...(237b) =
10a. Fuel costs - individual heating systems including micro-CHP
Fuel
kWh/year
Fuel
cost £/year
3363.90
x
3.48
x 0.01 =
117.06
(240)
2378.87
x
3.48
x 0.01 =
82.78
(247)
75.00
x
13.19
x 0.01 =
9.89
(249)
345.45
x
13.19
x 0.01 =
45.56
(250)
120.00
(251)
375.31
(255)
Energy cost deflator (Table 12)
0.42
(256)
Energy cost factor (ECF)
1.26
(257)
SAP value
82.41
Water heating
Pumps and fans
Electricity for lighting
Additional standing charges
(240)...(242) + (245)...(254) =
DR
AF
Total energy cost
T
Space heating - main system 1
Fuel price
11a. SAP rating - individual heating systems including micro-CHP
SAP rating (section 13)
82
SAP band
B
(258)
12a. CO₂ emissions - individual heating systems including micro-CHP
Emission factor
kg CO₂/kWh
Energy
kWh/year
Emissions
kg CO₂/year
Space heating - main system 1
3363.90
x
0.22
=
726.60
(261)
Water heating
2378.87
x
0.22
=
513.84
(264)
1240.44
(265)
Space and water heating
(261) + (262) + (263) + (264) =
Pumps and fans
75.00
x
0.52
=
38.93
(267)
Electricity for lighting
345.45
x
0.52
=
179.29
(268)
(265)...(271) =
1458.65
(272)
18.23
(273)
Total CO₂, kg/year
Dwelling CO₂ emission rate
(272) ÷ (4) =
EI value
84.36
EI rating (section 14)
84
EI band
B
(274)
13a. Primary energy - individual heating systems including micro-CHP
Energy
kWh/year
Primary factor
Primary Energy
kWh/year
Space heating - main system 1
3363.90
x
1.22
=
4103.95
(261)
Water heating
2378.87
x
1.22
=
2902.22
(264)
7006.17
(265)
Space and water heating
(261) + (262) + (263) + (264) =
Pumps and fans
75.00
x
3.07
=
230.25
(267)
Electricity for lighting
345.45
x
3.07
=
1060.52
(268)
Page 5
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
8296.94
(272)
Dwelling primary energy rate kWh/m2/year
103.71
(273)
DR
AF
T
Primary energy kWh/year
Page 6
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
DER Worksheet
Design - Draft
This design submission has been carried out using Approved SAP software. It has been prepared from plans and specifications and may not reflect the
property as constructed.
Assessor name
Dr Eric Roberts
Client
Address
Assessor number
3679
Last modified
28/11/2014
1 2b 4P Hook Rise, Tolworth, London, KT6
1. Overall dwelling dimensions
Area (m²)
80.00
Total floor area
(1a)
x
2.60
Volume (m³)
(2a)
=
T
Lowest occupied
Average storey
height (m)
(1a) + (1b) + (1c) + (1d)...(1n) =
80.00
Dwelling volume
(3a)
208.00
(5)
(4)
(3a) + (3b) + (3c) + (3d)...(3n) =
2. Ventilation rate
208.00
m³ per hour
0
x 40 =
0
(6a)
Number of open flues
0
x 20 =
0
(6b)
Number of intermittent fans
0
x 10 =
0
(7a)
Number of passive vents
0
x 10 =
0
(7b)
Number of flueless gas fires
0
x 40 =
0
(7c)
DR
AF
Number of chimneys
Infiltration due to chimneys, flues, fans, PSVs
(6a) + (6b) + (7a) + (7b) + (7c) =
0
Air changes per
hour
÷ (5) =
0.00
(8)
Air permeability value, q50, expressed in cubic metres per hour per square metre of envelope area
3.00
(17)
If based on air permeability value, then (18) = [(17) ÷ 20] + (8), otherwise (18) = (16)
0.15
(18)
2
(19)
1 - [0.075 x (19)] =
0.85
(20)
(18) x (20) =
0.13
(21)
If a pressurisation test has been carried out or is intended, proceed to (17), otherwise continue from (9) to (16)
Number of sides on which the dwelling is sheltered
Shelter factor
Infiltration rate incorporating shelter factor
Infiltration rate modified for monthly wind speed:
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Monthly average wind speed from Table U2
5.10
5.00
4.90
4.40
4.30
3.80
3.80
3.70
4.00
4.30
4.50
4.70
(22)
1.25
1.23
1.10
1.08
0.95
0.95
0.93
1.00
1.08
1.13
1.18
(22a)
0.12
0.12
0.13
0.14
0.14
0.15
(22b)
Wind factor (22)m ÷ 4
1.28
Adjusted infiltration rate (allowing for shelter and wind factor) (21) x (22a)m
0.16
0.16
0.16
0.14
0.14
0.12
Calculate effective air change rate for the applicable case:
If mechanical ventilation: air change rate through system
0.50
(23a)
If balanced with heat recovery: efficiency in % allowing for in-use factor from Table 4h
79.90
(23c)
a) If balanced mechanical ventilation with heat recovery (MVHR) (22b)m + (23b) x [1 - (23c) ÷ 100]
0.26
0.26
0.26
0.24
0.24
0.22
0.22
0.22
0.23
0.24
0.24
0.25
(24a)
0.22
0.22
0.22
0.23
0.24
0.24
0.25
(25)
Effective air change rate - enter (24a) or (24b) or (24c) or (24d) in (25)
0.26
0.26
0.26
0.24
0.24
Page 1
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
3. Heat losses and heat loss parameter
Element
Gross
area, m²
Openings
m²
Net area
A, m²
U-value
W/m²K
A x U W/K
κ-value,
kJ/m².K
A x κ,
kJ/K
Window
18.40
x
1.33
=
24.39
(27)
Door
2.00
x
1.40
=
2.80
(26)
External wall
65.40
x
0.15
=
9.81
(29a)
Party wall
25.38
x
0.00
=
0.00
(32)
Roof
80.00
x
0.12
=
9.60
(30)
Total area of external elements ∑A, m²
165.80
(31)
Fabric heat loss, W/K = ∑(A × U)
(26)...(30) + (32) =
46.60
(33)
N/A
(34)
Thermal mass parameter (TMP) in kJ/m²K
250.00
(35)
Thermal bridges: ∑(L x Ψ) calculated using Appendix K
14.64
(36)
61.25
(37)
Heat capacity Cm = ∑(A x κ)
(28)...(30) + (32) + (32a)...(32e) =
Total fabric heat loss
(33) + (36) =
Feb
Mar
Apr
May
Ventilation heat loss calculated monthly 0.33 x (25)m x (5)
18.06
17.84
17.62
16.53
16.31
77.77
77.55
Heat transfer coefficient, W/K (37)m + (38)m
79.30
79.08
78.86
Jun
Jul
Aug
Sep
Oct
Nov
Dec
15.21
15.21
14.99
15.65
16.31
16.74
17.18
76.46
76.46
76.24
76.90
77.55
77.99
78.43
T
Jan
DR
AF
Average = ∑(39)1...12/12 =
77.72
(38)
(39)
Heat loss parameter (HLP), W/m²K (39)m ÷ (4)
0.99
0.99
0.99
0.97
0.97
0.96
0.96
0.95
0.96
0.97
0.97
Average = ∑(40)1...12/12 =
0.98
0.97
(40)
Number of days in month (Table 1a)
31.00
28.00
31.00
30.00
31.00
30.00
31.00
31.00
30.00
31.00
30.00
31.00
(40)
4. Water heating energy requirement
Assumed occupancy, N
2.46
(42)
Annual average hot water usage in litres per day Vd,average = (25 x N) + 36
92.69
(43)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
83.42
87.13
90.84
94.55
98.25
101.96
Hot water usage in litres per day for each month Vd,m = factor from Table 1c x (43)
101.96
98.25
94.55
90.84
87.13
83.42
∑(44)1...12 =
1112.32
(44)
Energy content of hot water used = 4.18 x Vd,m x nm x Tm/3600 kWh/month (see Tables 1b, 1c 1d)
151.21
132.25
136.47
118.97
114.16
98.51
91.28
104.75
106.00
123.53
134.85
∑(45)1...12 =
146.44
1458.42
(45)
Distribution loss 0.15 x (45)m
22.68
19.84
20.47
17.85
17.12
14.78
13.69
15.71
15.90
18.53
20.23
Storage volume (litres) including any solar or WWHRS storage within same vessel
21.97
(46)
110.00
(47)
Hot water storage loss factor from Table 2 (kWh/litre/day)
0.02
(51)
Volume factor from Table 2a
1.03
(52)
Temperature factor from Table 2b
1.00
(53)
Energy lost from water storage (kWh/day) (47) x (51) x (52) x (53)
1.72
(54)
1.72
(55)
Water storage loss:
b) Manufacturer's declared loss factor is not known
Enter (50) or (54) in (55)
Water storage loss calculated for each month (55) x (41)m
53.36
48.19
53.36
51.64
53.36
51.64
Page 2
53.36
53.36
51.64
53.36
51.64
53.36
(56)
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
If the vessel contains dedicated solar storage or dedicated WWHRS (56)m x [(47) - Vs] ÷ (47), else (56)
53.36
48.19
53.36
51.64
53.36
51.64
53.36
53.36
51.64
53.36
51.64
53.36
(57)
22.51
23.26
22.51
23.26
23.26
22.51
23.26
22.51
23.26
(59)
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
(61)
Primary circuit loss for each month from Table 3
23.26
21.01
23.26
Combi loss for each month from Table 3a, 3b or 3c
0.00
0.00
0.00
Total heat required for water heating calculated for each month 0.85 x (45)m + (46)m + (57)m + (59)m + (61)m
227.83
201.45
213.09
193.12
190.78
172.66
167.90
181.37
180.15
200.15
209.00
223.06
(62)
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
(63)
172.66
167.90
181.37
180.15
200.15
209.00
223.06
Solar DHW input calculated using Appendix G or Appendix H
0.00
0.00
0.00
0.00
Output from water heater for each month (kWh/month) (62)m + (63)m
227.83
201.45
213.09
193.12
190.78
∑(64)1...12 =
2360.56
(64)
T
Heat gains from water heating (kWh/month) 0.25 × [0.85 × (45)m + (61)m] + 0.8 × [(46)m + (57)m + (59)m]
111.57
99.34
106.67
98.88
99.25
Jan
Feb
Mar
Apr
May
123.14
123.14
123.14
123.14
5. Internal gains
Metabolic gains (Table 5)
91.65
96.13
94.56
102.37
104.16
109.99
Jun
Jul
Aug
Sep
Oct
Nov
Dec
123.14
123.14
123.14
123.14
123.14
123.14
123.14
(66)
7.30
9.48
12.73
16.16
18.86
20.11
(67)
164.17
161.89
167.63
179.84
195.27
209.76
(68)
DR
AF
123.14
92.07
(65)
Lighting gains (calculated in Appendix L, equation L9 or L9a), also see Table 5
19.56
17.38
14.13
10.70
8.00
6.75
Appliance gains (calculated in Appendix L, equation L13 or L13a), also see Table 5
219.44
221.72
215.98
203.76
188.34
173.85
Cooking gains (calculated in Appendix L, equation L15 or L15a), also see Table 5
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
(69)
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
(70)
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
(71)
147.82
143.37
137.33
133.41
127.88
123.18
129.20
131.34
137.60
144.66
147.83
(72)
354.59
360.52
371.64
393.54
418.73
437.64
(73)
Pump and fan gains (Table 5a)
0.00
Losses e.g. evaporation (Table 5)
-98.51
Water heating gains (Table 5)
149.96
Total internal gains (66)m + (67)m + (68)m + (69)m + (70)m + (71)m + (72)m
448.91
446.86
433.43
411.73
389.69
368.42
6. Solar gains
Access factor
Table 6d
Area
m²
Solar flux
W/m²
Gains
W
FF
specific data
or Table 6c
g
specific data
or Table 6b
SouthEast
0.77
x
4.80
x
36.79
x 0.9 x
0.60
x
0.80
=
58.75
(77)
NorthWest
0.77
x
3.20
x
11.28
x 0.9 x
0.60
x
0.80
=
12.01
(81)
SouthWest
0.77
x
2.60
x
36.79
x 0.9 x
0.60
x
0.80
=
31.82
(79)
NorthEast
0.77
x
7.80
x
11.28
x 0.9 x
0.60
x
0.80
=
29.27
(75)
Solar gains in watts ∑(74)m...(82)m
131.85
238.31
362.49
510.20
627.19
647.16
613.73
522.71
413.05
273.20
160.43
111.22
(83)
921.93
1016.88
1015.59
968.32
883.22
784.69
666.75
579.16
548.86
(84)
Total gains - internal and solar (73)m + (83)m
580.76
685.17
795.92
7. Mean internal temperature (heating season)
Page 3
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
Temperature during heating periods in the living area from Table 9, Th1(˚C)
Jan
Feb
Mar
Apr
21.00
(85)
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
0.68
0.48
0.35
0.40
0.65
0.92
0.99
1.00
(86)
20.96
21.00
21.00
21.00
20.98
20.77
20.38
20.07
(87)
Utilisation factor for gains for living area n1,m (see Table 9a)
0.99
0.99
0.96
0.86
Mean internal temp of living area T1 (steps 3 to 7 in Table 9c)
20.10
20.28
20.54
20.82
Temperature during heating periods in the rest of dwelling from Table 9, Th2(˚C)
20.09
20.09
20.10
20.11
20.11
20.12
20.12
20.12
20.12
20.11
20.10
20.10
(88)
0.83
0.62
0.41
0.28
0.32
0.58
0.89
0.98
0.99
(89)
20.12
20.12
20.10
19.85
19.31
18.86
(90)
Utilisation factor for gains for rest of dwelling n2,m
0.99
0.98
0.95
Mean internal temperature in the rest of dwelling T2 (follow steps 3 to 7 in Table 9c)
18.89
19.16
19.53
19.91
20.08
20.12
Living area fraction
Living area ÷ (4) =
0.38
(91)
19.35
19.58
19.91
20.25
20.41
T
Mean internal temperature for the whole dwelling fLA x T1 +(1 - fLA) x T2
20.45
20.45
20.45
20.43
20.20
19.71
19.31
(92)
(93)
Apply adjustment to the mean internal temperature from Table 4e where appropriate
19.35
19.58
19.91
20.25
20.41
20.45
20.45
20.45
20.43
20.20
19.71
19.31
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
0.98
0.94
0.83
0.64
0.44
0.30
0.35
0.60
0.89
0.98
0.99
(94)
750.04
768.07
652.54
444.97
294.16
308.42
474.71
596.71
567.50
545.24
(95)
11.70
14.60
16.60
16.40
14.10
10.60
7.10
4.20
(96)
447.05
294.36
308.84
486.65
744.23
983.69
1185.03
(97)
0.00
0.00
0.00
0.00
109.76
299.66
476.00
8. Space heating requirement
DR
AF
Jan
Utilisation factor for gains, ƞm
0.99
Useful gains, ƞmGm, W (94)m x (84)m
575.70
670.70
Monthly average external temperature from Table U1
4.30
4.90
6.50
8.90
Heat loss rate for mean internal temperature, Lm, W [(39)m x [(93)m - (96)m]
1193.16
1160.68
1057.36
882.97
675.29
Space heating requirement, kWh/month 0.024 x [(97)m - (95)m] x (41)m
459.39
329.26
228.64
82.73
16.92
∑(98)1...5, 10...12 =
2002.37
(98)
(98) ÷ (4)
25.03
(99)
Fraction of space heat from secondary/supplementary system (table 11)
'0' if none
0.00
(301)
Fraction of space heat from community system
1 - (301) =
1.00
(302)
1.00
(303a)
1.00
(304a)
Factor for control and charging method (Table 4c(3)) for community space heating
1.00
(305)
Factor for charging method (Table 4c(3)) for community water heating
1.00
(305a)
Distribution loss factor (Table 12c) for community heating system
1.05
(306)
Space heating requirement kWh/m²/year
9b. Energy requirements - community heating scheme
Fraction of community heat from boilers
Fraction of total space heat from community boilers
(302) x (303a) =
Space heating
Annual space heating requirement
2002.37
Space heat from boilers
(98)
(98) x (304a) x (305) x (306) =
2102.49
(307a)
Water heating
Annual water heating requirement
2360.56
Page 4
(64)
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
Water heat from boilers
(64) x (303a) x (305a) x (306) =
Electricity used for heat distribution
2478.58
(310a)
45.81
(313)
0.01 × [(307a)…(307e) + (310a)…(310e)] =
Electricity for pumps, fans and electric keep-hot (Table 4f)
mechanical ventilation fans - balanced, extract or positive input from outside
136.40
(330a)
Total electricity for the above, kWh/year
136.40
(331)
Electricity for lighting (Appendix L)
345.49
(332)
5062.96
(338)
Total delivered energy for all uses
(307) + (309) + (310) + (312) + (315) + (331) + (332)...(337b) =
10b. Fuel costs - community heating scheme
Fuel
kWh/year
Fuel price
Fuel
cost £/year
2102.49
x
4.24
x 0.01 =
89.15
(340a)
Water heating from boilers
2478.58
x
4.24
x 0.01 =
105.09
(342a)
Pumps and fans
136.40
x
13.19
x 0.01 =
17.99
(349)
Electricity for lighting
345.49
x
13.19
x 0.01 =
45.57
(350)
120.00
(351)
377.80
(355)
0.42
(356)
1.27
(357)
Additional standing charges
Total energy cost
T
Space heating from boilers
(340a)...(342e) + (345)...(354) =
11b. SAP rating - community heating scheme
Energy cost deflator (Table 12)
DR
AF
Energy cost factor (ECF)
SAP value
82.29
SAP rating (section 13)
82
SAP band
B
(358)
12b. CO₂ emissions - community heating scheme
Emission factor
Energy
kWh/year
Emissions
(kg/year)
Emissions from other sources (space heating)
Efficiency of boilers
CO2 emissions from boilers
92.00
[(307a)+(310a)] x 100 ÷ (367a) =
(367a)
4979.42
x
0.216
=
1075.56
(367)
45.81
x
0.52
=
23.78
(372)
Total CO2 associated with community systems
1099.33
(373)
Total CO2 associated with space and water heating
1099.33
(376)
Electrical energy for community heat distribution
Pumps and fans
136.40
x
0.52
=
70.79
(378)
Electricity for lighting
345.49
x
0.52
=
179.31
(379)
(376)..(382) =
1349.43
(383)
(383) ÷ (4) =
16.87
(384)
Total CO₂, kg/year
Dwelling CO₂ emission rate
EI value
85.53
EI rating (section 14)
86
EI band
B
(385)
13b. Primary energy - community heating scheme
Energy
kWh/year
Primary factor
Primary energy
(kWh/year)
Primary energy from other sources (space heating)
Efficiency of boilers
Primary energy from boilers
92.00
[(307a)+(310a)] x 100 ÷ (367a) =
Electrical energy for community heat distribution
(367a)
4979.42
x
1.22
=
6074.90
(367)
45.81
x
3.07
=
140.64
(372)
6215.54
(373)
Total primary energy associated with community systems
Page 5
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
Total primary energy associated with space and water heating
6215.54
(376)
Pumps and fans
136.40
x
3.07
=
418.74
(378)
Electricity for lighting
345.49
x
3.07
=
1060.67
(379)
7694.94
(383)
96.19
(384)
Primary energy kWh/year
DR
AF
T
Dwelling primary energy rate kWh/m2/year
Page 6
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
DER Worksheet
Design - Draft
This design submission has been carried out using Approved SAP software. It has been prepared from plans and specifications and may not reflect the
property as constructed.
Assessor name
Dr Eric Roberts
Client
Address
Assessor number
3679
Last modified
04/12/2014
1 2b 4P Hook Rise, Tolworth, London, KT6
1. Overall dwelling dimensions
Area (m²)
80.00
Total floor area
(1a)
x
2.60
Volume (m³)
(2a)
=
T
Lowest occupied
Average storey
height (m)
(1a) + (1b) + (1c) + (1d)...(1n) =
80.00
Dwelling volume
(3a)
208.00
(5)
(4)
(3a) + (3b) + (3c) + (3d)...(3n) =
2. Ventilation rate
208.00
m³ per hour
0
x 40 =
0
(6a)
Number of open flues
0
x 20 =
0
(6b)
Number of intermittent fans
0
x 10 =
0
(7a)
Number of passive vents
0
x 10 =
0
(7b)
Number of flueless gas fires
0
x 40 =
0
(7c)
DR
AF
Number of chimneys
Infiltration due to chimneys, flues, fans, PSVs
(6a) + (6b) + (7a) + (7b) + (7c) =
0
Air changes per
hour
÷ (5) =
0.00
(8)
Air permeability value, q50, expressed in cubic metres per hour per square metre of envelope area
3.00
(17)
If based on air permeability value, then (18) = [(17) ÷ 20] + (8), otherwise (18) = (16)
0.15
(18)
2
(19)
1 - [0.075 x (19)] =
0.85
(20)
(18) x (20) =
0.13
(21)
If a pressurisation test has been carried out or is intended, proceed to (17), otherwise continue from (9) to (16)
Number of sides on which the dwelling is sheltered
Shelter factor
Infiltration rate incorporating shelter factor
Infiltration rate modified for monthly wind speed:
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Monthly average wind speed from Table U2
5.10
5.00
4.90
4.40
4.30
3.80
3.80
3.70
4.00
4.30
4.50
4.70
(22)
1.25
1.23
1.10
1.08
0.95
0.95
0.93
1.00
1.08
1.13
1.18
(22a)
0.12
0.12
0.13
0.14
0.14
0.15
(22b)
Wind factor (22)m ÷ 4
1.28
Adjusted infiltration rate (allowing for shelter and wind factor) (21) x (22a)m
0.16
0.16
0.16
0.14
0.14
0.12
Calculate effective air change rate for the applicable case:
If mechanical ventilation: air change rate through system
0.50
(23a)
If balanced with heat recovery: efficiency in % allowing for in-use factor from Table 4h
79.90
(23c)
a) If balanced mechanical ventilation with heat recovery (MVHR) (22b)m + (23b) x [1 - (23c) ÷ 100]
0.26
0.26
0.26
0.24
0.24
0.22
0.22
0.22
0.23
0.24
0.24
0.25
(24a)
0.22
0.22
0.22
0.23
0.24
0.24
0.25
(25)
Effective air change rate - enter (24a) or (24b) or (24c) or (24d) in (25)
0.26
0.26
0.26
0.24
0.24
Page 1
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
3. Heat losses and heat loss parameter
Element
Gross
area, m²
Openings
m²
Net area
A, m²
U-value
W/m²K
A x U W/K
κ-value,
kJ/m².K
A x κ,
kJ/K
Window
18.40
x
1.33
=
24.39
(27)
Door
2.00
x
1.40
=
2.80
(26)
External wall
65.40
x
0.15
=
9.81
(29a)
Party wall
25.38
x
0.00
=
0.00
(32)
Roof
80.00
x
0.12
=
9.60
(30)
Total area of external elements ∑A, m²
165.80
(31)
Fabric heat loss, W/K = ∑(A × U)
(26)...(30) + (32) =
46.60
(33)
N/A
(34)
Thermal mass parameter (TMP) in kJ/m²K
250.00
(35)
Thermal bridges: ∑(L x Ψ) calculated using Appendix K
14.64
(36)
61.25
(37)
Heat capacity Cm = ∑(A x κ)
(28)...(30) + (32) + (32a)...(32e) =
Total fabric heat loss
(33) + (36) =
Feb
Mar
Apr
May
Ventilation heat loss calculated monthly 0.33 x (25)m x (5)
18.06
17.84
17.62
16.53
16.31
77.77
77.55
Heat transfer coefficient, W/K (37)m + (38)m
79.30
79.08
78.86
Jun
Jul
Aug
Sep
Oct
Nov
Dec
15.21
15.21
14.99
15.65
16.31
16.74
17.18
76.46
76.46
76.24
76.90
77.55
77.99
78.43
T
Jan
DR
AF
Average = ∑(39)1...12/12 =
77.72
(38)
(39)
Heat loss parameter (HLP), W/m²K (39)m ÷ (4)
0.99
0.99
0.99
0.97
0.97
0.96
0.96
0.95
0.96
0.97
0.97
Average = ∑(40)1...12/12 =
0.98
0.97
(40)
Number of days in month (Table 1a)
31.00
28.00
31.00
30.00
31.00
30.00
31.00
31.00
30.00
31.00
30.00
31.00
(40)
4. Water heating energy requirement
Assumed occupancy, N
2.46
(42)
Annual average hot water usage in litres per day Vd,average = (25 x N) + 36
92.69
(43)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
83.42
87.13
90.84
94.55
98.25
101.96
Hot water usage in litres per day for each month Vd,m = factor from Table 1c x (43)
101.96
98.25
94.55
90.84
87.13
83.42
∑(44)1...12 =
1112.32
(44)
Energy content of hot water used = 4.18 x Vd,m x nm x Tm/3600 kWh/month (see Tables 1b, 1c 1d)
151.21
132.25
136.47
118.97
114.16
98.51
91.28
104.75
106.00
123.53
134.85
∑(45)1...12 =
146.44
1458.42
(45)
Distribution loss 0.15 x (45)m
22.68
19.84
20.47
17.85
17.12
14.78
13.69
15.71
15.90
18.53
20.23
Storage volume (litres) including any solar or WWHRS storage within same vessel
21.97
(46)
110.00
(47)
Hot water storage loss factor from Table 2 (kWh/litre/day)
0.02
(51)
Volume factor from Table 2a
1.03
(52)
Temperature factor from Table 2b
1.00
(53)
Energy lost from water storage (kWh/day) (47) x (51) x (52) x (53)
1.72
(54)
1.72
(55)
Water storage loss:
b) Manufacturer's declared loss factor is not known
Enter (50) or (54) in (55)
Water storage loss calculated for each month (55) x (41)m
53.36
48.19
53.36
51.64
53.36
51.64
Page 2
53.36
53.36
51.64
53.36
51.64
53.36
(56)
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
If the vessel contains dedicated solar storage or dedicated WWHRS (56)m x [(47) - Vs] ÷ (47), else (56)
53.36
48.19
53.36
51.64
53.36
51.64
53.36
53.36
51.64
53.36
51.64
53.36
(57)
22.51
23.26
22.51
23.26
23.26
22.51
23.26
22.51
23.26
(59)
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
(61)
Primary circuit loss for each month from Table 3
23.26
21.01
23.26
Combi loss for each month from Table 3a, 3b or 3c
0.00
0.00
0.00
Total heat required for water heating calculated for each month 0.85 x (45)m + (46)m + (57)m + (59)m + (61)m
227.83
201.45
213.09
193.12
190.78
172.66
167.90
181.37
180.15
200.15
209.00
223.06
(62)
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
(63)
172.66
167.90
181.37
180.15
200.15
209.00
223.06
Solar DHW input calculated using Appendix G or Appendix H
0.00
0.00
0.00
0.00
Output from water heater for each month (kWh/month) (62)m + (63)m
227.83
201.45
213.09
193.12
190.78
∑(64)1...12 =
2360.56
(64)
T
Heat gains from water heating (kWh/month) 0.25 × [0.85 × (45)m + (61)m] + 0.8 × [(46)m + (57)m + (59)m]
111.57
99.34
106.67
98.88
99.25
Jan
Feb
Mar
Apr
May
123.14
123.14
123.14
123.14
5. Internal gains
Metabolic gains (Table 5)
91.65
96.13
94.56
102.37
104.16
109.99
Jun
Jul
Aug
Sep
Oct
Nov
Dec
123.14
123.14
123.14
123.14
123.14
123.14
123.14
(66)
7.30
9.48
12.73
16.16
18.86
20.11
(67)
164.17
161.89
167.63
179.84
195.27
209.76
(68)
DR
AF
123.14
92.07
(65)
Lighting gains (calculated in Appendix L, equation L9 or L9a), also see Table 5
19.56
17.38
14.13
10.70
8.00
6.75
Appliance gains (calculated in Appendix L, equation L13 or L13a), also see Table 5
219.44
221.72
215.98
203.76
188.34
173.85
Cooking gains (calculated in Appendix L, equation L15 or L15a), also see Table 5
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
(69)
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
(70)
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
(71)
147.82
143.37
137.33
133.41
127.88
123.18
129.20
131.34
137.60
144.66
147.83
(72)
354.59
360.52
371.64
393.54
418.73
437.64
(73)
Pump and fan gains (Table 5a)
0.00
Losses e.g. evaporation (Table 5)
-98.51
Water heating gains (Table 5)
149.96
Total internal gains (66)m + (67)m + (68)m + (69)m + (70)m + (71)m + (72)m
448.91
446.86
433.43
411.73
389.69
368.42
6. Solar gains
Access factor
Table 6d
Area
m²
Solar flux
W/m²
Gains
W
FF
specific data
or Table 6c
g
specific data
or Table 6b
SouthEast
0.77
x
4.80
x
36.79
x 0.9 x
0.60
x
0.80
=
58.75
(77)
NorthWest
0.77
x
3.20
x
11.28
x 0.9 x
0.60
x
0.80
=
12.01
(81)
SouthWest
0.77
x
2.60
x
36.79
x 0.9 x
0.60
x
0.80
=
31.82
(79)
NorthEast
0.77
x
7.80
x
11.28
x 0.9 x
0.60
x
0.80
=
29.27
(75)
Solar gains in watts ∑(74)m...(82)m
131.85
238.31
362.49
510.20
627.19
647.16
613.73
522.71
413.05
273.20
160.43
111.22
(83)
921.93
1016.88
1015.59
968.32
883.22
784.69
666.75
579.16
548.86
(84)
Total gains - internal and solar (73)m + (83)m
580.76
685.17
795.92
7. Mean internal temperature (heating season)
Page 3
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
Temperature during heating periods in the living area from Table 9, Th1(˚C)
Jan
Feb
Mar
Apr
21.00
(85)
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
0.68
0.48
0.35
0.40
0.65
0.92
0.99
1.00
(86)
20.96
21.00
21.00
21.00
20.98
20.77
20.38
20.07
(87)
Utilisation factor for gains for living area n1,m (see Table 9a)
0.99
0.99
0.96
0.86
Mean internal temp of living area T1 (steps 3 to 7 in Table 9c)
20.10
20.28
20.54
20.82
Temperature during heating periods in the rest of dwelling from Table 9, Th2(˚C)
20.09
20.09
20.10
20.11
20.11
20.12
20.12
20.12
20.12
20.11
20.10
20.10
(88)
0.83
0.62
0.41
0.28
0.32
0.58
0.89
0.98
0.99
(89)
20.12
20.12
20.10
19.85
19.31
18.86
(90)
Utilisation factor for gains for rest of dwelling n2,m
0.99
0.98
0.95
Mean internal temperature in the rest of dwelling T2 (follow steps 3 to 7 in Table 9c)
18.89
19.16
19.53
19.91
20.08
20.12
Living area fraction
Living area ÷ (4) =
0.38
(91)
19.35
19.58
19.91
20.25
20.41
T
Mean internal temperature for the whole dwelling fLA x T1 +(1 - fLA) x T2
20.45
20.45
20.45
20.43
20.20
19.71
19.31
(92)
(93)
Apply adjustment to the mean internal temperature from Table 4e where appropriate
19.35
19.58
19.91
20.25
20.41
20.45
20.45
20.45
20.43
20.20
19.71
19.31
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
0.98
0.94
0.83
0.64
0.44
0.30
0.35
0.60
0.89
0.98
0.99
(94)
750.04
768.07
652.54
444.97
294.16
308.42
474.71
596.71
567.50
545.24
(95)
11.70
14.60
16.60
16.40
14.10
10.60
7.10
4.20
(96)
447.05
294.36
308.84
486.65
744.23
983.69
1185.03
(97)
0.00
0.00
0.00
0.00
109.76
299.66
476.00
8. Space heating requirement
DR
AF
Jan
Utilisation factor for gains, ƞm
0.99
Useful gains, ƞmGm, W (94)m x (84)m
575.70
670.70
Monthly average external temperature from Table U1
4.30
4.90
6.50
8.90
Heat loss rate for mean internal temperature, Lm, W [(39)m x [(93)m - (96)m]
1193.16
1160.68
1057.36
882.97
675.29
Space heating requirement, kWh/month 0.024 x [(97)m - (95)m] x (41)m
459.39
329.26
228.64
82.73
16.92
∑(98)1...5, 10...12 =
2002.37
(98)
(98) ÷ (4)
25.03
(99)
Fraction of space heat from secondary/supplementary system (table 11)
'0' if none
0.00
(301)
Fraction of space heat from community system
1 - (301) =
1.00
(302)
Fraction of community heat from boilers
0.43
(303a)
Fraction of community heat from CHP
0.57
(303b)
Space heating requirement kWh/m²/year
9b. Energy requirements - community heating scheme
Fraction of total space heat from community CHP
(302) x (303a) =
0.57
(304a)
Fraction of total space heat from community boilers
(302) x (303b) =
0.43
(304b)
Factor for control and charging method (Table 4c(3)) for community space heating
1.00
(305)
Factor for charging method (Table 4c(3)) for community water heating
1.00
(305a)
Distribution loss factor (Table 12c) for community heating system
1.05
(306)
Space heating
Annual space heating requirement
2002.37
(98)
Space heat from CHP
(98) x (304a) x (305) x (306) =
1198.42
(307a)
Space heat from boilers
(98) x (304b) x (305) x (306) =
904.07
(307b)
Page 4
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
Water heating
Annual water heating requirement
2360.56
(64)
Water heat from CHP
(64) x (303a) x (305a) x (306) =
1412.79
(310a)
Water heat from boilers
(64) x (303b) x (305a) x (306) =
1065.79
(310b)
45.81
(313)
Electricity used for heat distribution
0.01 × [(307a)…(307e) + (310a)…(310e)] =
Electricity for pumps, fans and electric keep-hot (Table 4f)
mechanical ventilation fans - balanced, extract or positive input from outside
(330a)
136.40
Total electricity for the above, kWh/year
136.40
(331)
Electricity for lighting (Appendix L)
345.49
(332)
5062.96
(338)
Total delivered energy for all uses
(307) + (309) + (310) + (312) + (315) + (331) + (332)...(337b) =
10b. Fuel costs - community heating scheme
Fuel price
Fuel
cost £/year
T
Fuel
kWh/year
Space heating from CHP
1198.42
x
2.97
x 0.01 =
35.59
(340a)
904.07
x
4.24
x 0.01 =
38.33
(340b)
1412.79
x
2.97
x 0.01 =
41.96
(342a)
1065.79
x
4.24
x 0.01 =
45.19
(342b)
136.40
x
13.19
x 0.01 =
17.99
(349)
345.49
x
13.19
x 0.01 =
45.57
(350)
120.00
(351)
344.64
(355)
Energy cost deflator (Table 12)
0.42
(356)
Energy cost factor (ECF)
1.16
(357)
SAP value
83.85
Space heating from boilers
Water heating from CHP
Water heating from boilers
DR
AF
Pumps and fans
Electricity for lighting
Additional standing charges
Total energy cost
(340a)...(342e) + (345)...(354) =
11b. SAP rating - community heating scheme
SAP rating (section 13)
84
SAP band
B
(358)
12b. CO₂ emissions - community heating scheme
Emission factor
Energy
kWh/year
Emissions
(kg/year)
Emissions from community CHP (space and water heating)
Power efficiency of CHP unit
30.37
(361)
Heat efficiency of CHP unit
51.63
(362)
Space heating from CHP
(307a) × 100 ÷ (362) =
less credit emissions for electricity
Water heated by CHP
less credit emissions for electricity
2321.1799
x
0.2160
=
501.3749
(363)
-704.9509
x
0.5190
=
-365.8695
(364)
2736.4000
x
0.2160
=
591.0624
(365)
-831.0548
x
0.5190
=
-431.3174
(366)
Emissions from other sources (space heating)
Efficiency of boilers
CO2 emissions from boilers
92.00
[(307b)+(310b)] x 100 ÷ (367b) =
(367b)
2141.15
x
0.216
=
462.49
(368)
45.81
x
0.52
=
23.78
(372)
Total CO2 associated with community systems
781.51
(373)
Total CO2 associated with space and water heating
781.51
(376)
Electrical energy for community heat distribution
Pumps and fans
136.40
x
0.52
=
70.79
(378)
Electricity for lighting
345.49
x
0.52
=
179.31
(379)
Page 5
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
Total CO₂, kg/year
Dwelling CO₂ emission rate
(376)..(382) =
1031.62
(383)
(383) ÷ (4) =
12.90
(384)
EI value
88.94
EI rating (section 14)
89
EI band
B
(385)
13b. Primary energy - community heating scheme
Energy
kWh/year
Primary factor
Primary energy
(kWh/year)
Primary Energy from community CHP (space and water heating)
Power efficiency of CHP unit
30.37
(361)
Heat efficiency of CHP unit
51.63
(362)
(307a) × 100 ÷ (362) =
less credit energy for electricity
Water heated by CHP
less credit energy for electricity
Primary energy from other sources (space heating)
Efficiency of boilers
Primary energy from boilers
2321.18
x
1.22
=
2831.84
(363)
-704.95
x
3.07
=
-2164.20
(364)
2736.40
x
1.22
=
3338.41
(365)
-831.05
x
3.07
=
-2551.34
(366)
T
Space heating from CHP
92.00
[(307b)+(310b)] x 100 ÷ (367b) =
(367b)
2141.15
x
1.22
=
2612.21
(368)
45.81
x
3.07
=
140.64
(372)
Total primary energy associated with community systems
4207.55
(373)
Total primary energy associated with space and water heating
4207.55
(376)
DR
AF
Electrical energy for community heat distribution
Pumps and fans
136.40
x
3.07
=
418.74
(378)
Electricity for lighting
345.49
x
3.07
=
1060.67
(379)
5686.96
(383)
71.09
(384)
Primary energy kWh/year
Dwelling primary energy rate kWh/m2/year
Page 6
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
DER Worksheet
Design - Draft
This design submission has been carried out using Approved SAP software. It has been prepared from plans and specifications and may not reflect the
property as constructed.
Assessor name
Dr Eric Roberts
Client
Address
Assessor number
3679
Last modified
09/12/2014
1 2b 4P Hook Rise, Tolworth, London, KT6
1. Overall dwelling dimensions
Area (m²)
80.00
Total floor area
(1a)
x
2.60
Volume (m³)
(2a)
=
T
Lowest occupied
Average storey
height (m)
(1a) + (1b) + (1c) + (1d)...(1n) =
80.00
Dwelling volume
(3a)
208.00
(5)
(4)
(3a) + (3b) + (3c) + (3d)...(3n) =
2. Ventilation rate
208.00
m³ per hour
0
x 40 =
0
(6a)
Number of open flues
0
x 20 =
0
(6b)
Number of intermittent fans
0
x 10 =
0
(7a)
Number of passive vents
0
x 10 =
0
(7b)
Number of flueless gas fires
0
x 40 =
0
(7c)
DR
AF
Number of chimneys
Infiltration due to chimneys, flues, fans, PSVs
(6a) + (6b) + (7a) + (7b) + (7c) =
0
Air changes per
hour
÷ (5) =
0.00
(8)
Air permeability value, q50, expressed in cubic metres per hour per square metre of envelope area
3.00
(17)
If based on air permeability value, then (18) = [(17) ÷ 20] + (8), otherwise (18) = (16)
0.15
(18)
2
(19)
1 - [0.075 x (19)] =
0.85
(20)
(18) x (20) =
0.13
(21)
If a pressurisation test has been carried out or is intended, proceed to (17), otherwise continue from (9) to (16)
Number of sides on which the dwelling is sheltered
Shelter factor
Infiltration rate incorporating shelter factor
Infiltration rate modified for monthly wind speed:
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Monthly average wind speed from Table U2
5.10
5.00
4.90
4.40
4.30
3.80
3.80
3.70
4.00
4.30
4.50
4.70
(22)
1.25
1.23
1.10
1.08
0.95
0.95
0.93
1.00
1.08
1.13
1.18
(22a)
0.12
0.12
0.13
0.14
0.14
0.15
(22b)
Wind factor (22)m ÷ 4
1.28
Adjusted infiltration rate (allowing for shelter and wind factor) (21) x (22a)m
0.16
0.16
0.16
0.14
0.14
0.12
Calculate effective air change rate for the applicable case:
If mechanical ventilation: air change rate through system
0.50
(23a)
If balanced with heat recovery: efficiency in % allowing for in-use factor from Table 4h
79.90
(23c)
a) If balanced mechanical ventilation with heat recovery (MVHR) (22b)m + (23b) x [1 - (23c) ÷ 100]
0.26
0.26
0.26
0.24
0.24
0.22
0.22
0.22
0.23
0.24
0.24
0.25
(24a)
0.22
0.22
0.22
0.23
0.24
0.24
0.25
(25)
Effective air change rate - enter (24a) or (24b) or (24c) or (24d) in (25)
0.26
0.26
0.26
0.24
0.24
Page 1
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
3. Heat losses and heat loss parameter
Element
Gross
area, m²
Openings
m²
Net area
A, m²
U-value
W/m²K
A x U W/K
κ-value,
kJ/m².K
A x κ,
kJ/K
Window
18.40
x
1.33
=
24.39
(27)
Door
2.00
x
1.40
=
2.80
(26)
External wall
65.40
x
0.15
=
9.81
(29a)
Party wall
25.38
x
0.00
=
0.00
(32)
Roof
80.00
x
0.12
=
9.60
(30)
Total area of external elements ∑A, m²
165.80
(31)
Fabric heat loss, W/K = ∑(A × U)
(26)...(30) + (32) =
46.60
(33)
N/A
(34)
Thermal mass parameter (TMP) in kJ/m²K
250.00
(35)
Thermal bridges: ∑(L x Ψ) calculated using Appendix K
14.64
(36)
61.25
(37)
Heat capacity Cm = ∑(A x κ)
(28)...(30) + (32) + (32a)...(32e) =
Total fabric heat loss
(33) + (36) =
Feb
Mar
Apr
May
Ventilation heat loss calculated monthly 0.33 x (25)m x (5)
18.06
17.84
17.62
16.53
16.31
77.77
77.55
Heat transfer coefficient, W/K (37)m + (38)m
79.30
79.08
78.86
Jun
Jul
Aug
Sep
Oct
Nov
Dec
15.21
15.21
14.99
15.65
16.31
16.74
17.18
76.46
76.46
76.24
76.90
77.55
77.99
78.43
T
Jan
DR
AF
Average = ∑(39)1...12/12 =
77.72
(38)
(39)
Heat loss parameter (HLP), W/m²K (39)m ÷ (4)
0.99
0.99
0.99
0.97
0.97
0.96
0.96
0.95
0.96
0.97
0.97
Average = ∑(40)1...12/12 =
0.98
0.97
(40)
Number of days in month (Table 1a)
31.00
28.00
31.00
30.00
31.00
30.00
31.00
31.00
30.00
31.00
30.00
31.00
(40)
4. Water heating energy requirement
Assumed occupancy, N
2.46
(42)
Annual average hot water usage in litres per day Vd,average = (25 x N) + 36
92.69
(43)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
83.42
87.13
90.84
94.55
98.25
101.96
Hot water usage in litres per day for each month Vd,m = factor from Table 1c x (43)
101.96
98.25
94.55
90.84
87.13
83.42
∑(44)1...12 =
1112.32
(44)
Energy content of hot water used = 4.18 x Vd,m x nm x Tm/3600 kWh/month (see Tables 1b, 1c 1d)
151.21
132.25
136.47
118.97
114.16
98.51
91.28
104.75
106.00
123.53
134.85
∑(45)1...12 =
146.44
1458.42
(45)
Distribution loss 0.15 x (45)m
22.68
19.84
20.47
17.85
17.12
14.78
13.69
15.71
15.90
18.53
20.23
Storage volume (litres) including any solar or WWHRS storage within same vessel
21.97
(46)
110.00
(47)
Hot water storage loss factor from Table 2 (kWh/litre/day)
0.02
(51)
Volume factor from Table 2a
1.03
(52)
Temperature factor from Table 2b
1.00
(53)
Energy lost from water storage (kWh/day) (47) x (51) x (52) x (53)
1.72
(54)
1.72
(55)
Water storage loss:
b) Manufacturer's declared loss factor is not known
Enter (50) or (54) in (55)
Water storage loss calculated for each month (55) x (41)m
53.36
48.19
53.36
51.64
53.36
51.64
Page 2
53.36
53.36
51.64
53.36
51.64
53.36
(56)
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
If the vessel contains dedicated solar storage or dedicated WWHRS (56)m x [(47) - Vs] ÷ (47), else (56)
53.36
48.19
53.36
51.64
53.36
51.64
53.36
53.36
51.64
53.36
51.64
53.36
(57)
22.51
23.26
22.51
23.26
23.26
22.51
23.26
22.51
23.26
(59)
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
(61)
Primary circuit loss for each month from Table 3
23.26
21.01
23.26
Combi loss for each month from Table 3a, 3b or 3c
0.00
0.00
0.00
Total heat required for water heating calculated for each month 0.85 x (45)m + (46)m + (57)m + (59)m + (61)m
227.83
201.45
213.09
193.12
190.78
172.66
167.90
181.37
180.15
200.15
209.00
223.06
(62)
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
(63)
172.66
167.90
181.37
180.15
200.15
209.00
223.06
Solar DHW input calculated using Appendix G or Appendix H
0.00
0.00
0.00
0.00
Output from water heater for each month (kWh/month) (62)m + (63)m
227.83
201.45
213.09
193.12
190.78
∑(64)1...12 =
2360.56
(64)
T
Heat gains from water heating (kWh/month) 0.25 × [0.85 × (45)m + (61)m] + 0.8 × [(46)m + (57)m + (59)m]
111.57
99.34
106.67
98.88
99.25
Jan
Feb
Mar
Apr
May
123.14
123.14
123.14
123.14
5. Internal gains
Metabolic gains (Table 5)
91.65
96.13
94.56
102.37
104.16
109.99
Jun
Jul
Aug
Sep
Oct
Nov
Dec
123.14
123.14
123.14
123.14
123.14
123.14
123.14
(66)
7.30
9.48
12.73
16.16
18.86
20.11
(67)
164.17
161.89
167.63
179.84
195.27
209.76
(68)
DR
AF
123.14
92.07
(65)
Lighting gains (calculated in Appendix L, equation L9 or L9a), also see Table 5
19.56
17.38
14.13
10.70
8.00
6.75
Appliance gains (calculated in Appendix L, equation L13 or L13a), also see Table 5
219.44
221.72
215.98
203.76
188.34
173.85
Cooking gains (calculated in Appendix L, equation L15 or L15a), also see Table 5
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
35.31
(69)
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
(70)
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
-98.51
(71)
147.82
143.37
137.33
133.41
127.88
123.18
129.20
131.34
137.60
144.66
147.83
(72)
354.59
360.52
371.64
393.54
418.73
437.64
(73)
Pump and fan gains (Table 5a)
0.00
Losses e.g. evaporation (Table 5)
-98.51
Water heating gains (Table 5)
149.96
Total internal gains (66)m + (67)m + (68)m + (69)m + (70)m + (71)m + (72)m
448.91
446.86
433.43
411.73
389.69
368.42
6. Solar gains
Access factor
Table 6d
Area
m²
Solar flux
W/m²
Gains
W
FF
specific data
or Table 6c
g
specific data
or Table 6b
SouthEast
0.77
x
4.80
x
36.79
x 0.9 x
0.60
x
0.80
=
58.75
(77)
NorthWest
0.77
x
3.20
x
11.28
x 0.9 x
0.60
x
0.80
=
12.01
(81)
SouthWest
0.77
x
2.60
x
36.79
x 0.9 x
0.60
x
0.80
=
31.82
(79)
NorthEast
0.77
x
7.80
x
11.28
x 0.9 x
0.60
x
0.80
=
29.27
(75)
Solar gains in watts ∑(74)m...(82)m
131.85
238.31
362.49
510.20
627.19
647.16
613.73
522.71
413.05
273.20
160.43
111.22
(83)
921.93
1016.88
1015.59
968.32
883.22
784.69
666.75
579.16
548.86
(84)
Total gains - internal and solar (73)m + (83)m
580.76
685.17
795.92
7. Mean internal temperature (heating season)
Page 3
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
Temperature during heating periods in the living area from Table 9, Th1(˚C)
Jan
Feb
Mar
Apr
21.00
(85)
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
0.68
0.48
0.35
0.40
0.65
0.92
0.99
1.00
(86)
20.96
21.00
21.00
21.00
20.98
20.77
20.38
20.07
(87)
Utilisation factor for gains for living area n1,m (see Table 9a)
0.99
0.99
0.96
0.86
Mean internal temp of living area T1 (steps 3 to 7 in Table 9c)
20.10
20.28
20.54
20.82
Temperature during heating periods in the rest of dwelling from Table 9, Th2(˚C)
20.09
20.09
20.10
20.11
20.11
20.12
20.12
20.12
20.12
20.11
20.10
20.10
(88)
0.83
0.62
0.41
0.28
0.32
0.58
0.89
0.98
0.99
(89)
20.12
20.12
20.10
19.85
19.31
18.86
(90)
Utilisation factor for gains for rest of dwelling n2,m
0.99
0.98
0.95
Mean internal temperature in the rest of dwelling T2 (follow steps 3 to 7 in Table 9c)
18.89
19.16
19.53
19.91
20.08
20.12
Living area fraction
Living area ÷ (4) =
0.38
(91)
19.35
19.58
19.91
20.25
20.41
T
Mean internal temperature for the whole dwelling fLA x T1 +(1 - fLA) x T2
20.45
20.45
20.45
20.43
20.20
19.71
19.31
(92)
(93)
Apply adjustment to the mean internal temperature from Table 4e where appropriate
19.35
19.58
19.91
20.25
20.41
20.45
20.45
20.45
20.43
20.20
19.71
19.31
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
0.98
0.94
0.83
0.64
0.44
0.30
0.35
0.60
0.89
0.98
0.99
(94)
750.04
768.07
652.54
444.97
294.16
308.42
474.71
596.71
567.50
545.24
(95)
11.70
14.60
16.60
16.40
14.10
10.60
7.10
4.20
(96)
447.05
294.36
308.84
486.65
744.23
983.69
1185.03
(97)
0.00
0.00
0.00
0.00
109.76
299.66
476.00
8. Space heating requirement
DR
AF
Jan
Utilisation factor for gains, ƞm
0.99
Useful gains, ƞmGm, W (94)m x (84)m
575.70
670.70
Monthly average external temperature from Table U1
4.30
4.90
6.50
8.90
Heat loss rate for mean internal temperature, Lm, W [(39)m x [(93)m - (96)m]
1193.16
1160.68
1057.36
882.97
675.29
Space heating requirement, kWh/month 0.024 x [(97)m - (95)m] x (41)m
459.39
329.26
228.64
82.73
16.92
∑(98)1...5, 10...12 =
2002.37
(98)
(98) ÷ (4)
25.03
(99)
Fraction of space heat from secondary/supplementary system (table 11)
'0' if none
0.00
(301)
Fraction of space heat from community system
1 - (301) =
1.00
(302)
Fraction of community heat from boilers
0.43
(303a)
Fraction of community heat from CHP
0.57
(303b)
Space heating requirement kWh/m²/year
9b. Energy requirements - community heating scheme
Fraction of total space heat from community CHP
(302) x (303a) =
0.57
(304a)
Fraction of total space heat from community boilers
(302) x (303b) =
0.43
(304b)
Factor for control and charging method (Table 4c(3)) for community space heating
1.00
(305)
Factor for charging method (Table 4c(3)) for community water heating
1.00
(305a)
Distribution loss factor (Table 12c) for community heating system
1.05
(306)
Space heating
Annual space heating requirement
2002.37
(98)
Space heat from CHP
(98) x (304a) x (305) x (306) =
1198.42
(307a)
Space heat from boilers
(98) x (304b) x (305) x (306) =
904.07
(307b)
Page 4
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
Water heating
Annual water heating requirement
2360.56
(64)
Water heat from CHP
(64) x (303a) x (305a) x (306) =
1412.79
(310a)
Water heat from boilers
(64) x (303b) x (305a) x (306) =
1065.79
(310b)
45.81
(313)
Electricity used for heat distribution
0.01 × [(307a)…(307e) + (310a)…(310e)] =
Electricity for pumps, fans and electric keep-hot (Table 4f)
mechanical ventilation fans - balanced, extract or positive input from outside
(330a)
136.40
Total electricity for the above, kWh/year
136.40
(331)
Electricity for lighting (Appendix L)
345.49
(332)
-129.54
(333)
4933.42
(338)
Energy saving/generation technologies
electricity generated by PV (Appendix M)
(307) + (309) + (310) + (312) + (315) + (331) + (332)...(337b) =
10b. Fuel costs - community heating scheme
T
Total delivered energy for all uses
Fuel price
Fuel
kWh/year
Space heating from CHP
Fuel
cost £/year
1198.42
x
2.97
x 0.01 =
35.59
(340a)
904.07
x
4.24
x 0.01 =
38.33
(340b)
1412.79
x
2.97
x 0.01 =
41.96
(342a)
Water heating from boilers
1065.79
x
4.24
x 0.01 =
45.19
(342b)
Pumps and fans
136.40
x
13.19
x 0.01 =
17.99
(349)
Electricity for lighting
345.49
x
13.19
x 0.01 =
45.57
(350)
120.00
(351)
0.00
(352)
344.64
(355)
Energy cost deflator (Table 12)
0.42
(356)
Energy cost factor (ECF)
1.16
(357)
SAP value
83.85
Space heating from boilers
DR
AF
Water heating from CHP
Additional standing charges
Energy saving/generation technologies
pv savings
-129.54
x
Total energy cost
13.19
x 0.01 =
(340a)...(342e) + (345)...(354) =
11b. SAP rating - community heating scheme
SAP rating (section 13)
84
SAP band
B
(358)
12b. CO₂ emissions - community heating scheme
Energy
kWh/year
Emission factor
Emissions
(kg/year)
Emissions from community CHP (space and water heating)
Power efficiency of CHP unit
30.37
(361)
Heat efficiency of CHP unit
51.63
(362)
Space heating from CHP
(307a) × 100 ÷ (362) =
less credit emissions for electricity
Water heated by CHP
less credit emissions for electricity
2321.1799
x
0.2160
=
501.3749
(363)
-704.9509
x
0.5190
=
-365.8695
(364)
2736.4000
x
0.2160
=
591.0624
(365)
-831.0548
x
0.5190
=
-431.3174
(366)
Emissions from other sources (space heating)
Efficiency of boilers
CO2 emissions from boilers
92.00
[(307b)+(310b)] x 100 ÷ (367b) =
Electrical energy for community heat distribution
(367b)
2141.15
x
0.216
=
462.49
(368)
45.81
x
0.52
=
23.78
(372)
Page 5
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
Total CO2 associated with community systems
781.51
(373)
Total CO2 associated with space and water heating
781.51
(376)
Pumps and fans
136.40
x
0.52
=
70.79
(378)
Electricity for lighting
345.49
x
0.52
=
179.31
(379)
-129.54
x
0.52
=
-67.23
(380)
(376)..(382) =
964.38
(383)
(383) ÷ (4) =
12.05
(384)
Energy saving/generation technologies
pv savings
Total CO₂, kg/year
Dwelling CO₂ emission rate
EI value
89.66
EI rating (section 14)
90
EI band
B
(385)
13b. Primary energy - community heating scheme
Primary Energy from community CHP (space and water heating)
Power efficiency of CHP unit
Heat efficiency of CHP unit
Space heating from CHP
(307a) × 100 ÷ (362) =
Primary factor
Primary energy
(kWh/year)
T
Energy
kWh/year
30.37
(361)
51.63
(362)
2321.18
x
1.22
=
2831.84
(363)
-704.95
x
3.07
=
-2164.20
(364)
Water heated by CHP
2736.40
x
1.22
=
3338.41
(365)
less credit energy for electricity
-831.05
x
3.07
=
-2551.34
(366)
DR
AF
less credit energy for electricity
Primary energy from other sources (space heating)
Efficiency of boilers
Primary energy from boilers
92.00
[(307b)+(310b)] x 100 ÷ (367b) =
(367b)
2141.15
x
1.22
=
2612.21
(368)
45.81
x
3.07
=
140.64
(372)
Total primary energy associated with community systems
4207.55
(373)
Total primary energy associated with space and water heating
4207.55
(376)
Electrical energy for community heat distribution
Pumps and fans
136.40
x
3.07
=
418.74
(378)
Electricity for lighting
345.49
x
3.07
=
1060.67
(379)
-129.54
x
3.07
=
-397.70
(380)
5289.26
(383)
66.12
(384)
Energy saving/generation technologies
Electricity generated - PVs
Primary energy kWh/year
Dwelling primary energy rate kWh/m2/year
Page 6
URN: 2b4p EW version 1
NHER Plan Assessor version 6.1.0
SAP version 9.92
Buildings & Places
Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
March 2015
APPENDIX C – LONDON HEAT MAP
Tolworth Towers
Proposed Development
Source: http://www.londonheatmap.org.uk/Mapping/
ENERGY STRATEGY
March 2015
29
Buildings & Places
Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
March 2015
APPENDIX D – DISTRICT HEATING NETWORK LIAISON WITH
TOLWORTH TOWERS
ENERGY STRATEGY
March 2015
30
From:
To:
Cc:
Subject:
Date:
Attachments:
Les Smith
Taylor, Mark
Smith, Gill; Riley, Oliver; Nik Dyer; Sushil Pathak; Jana Gazi-Baratova
RE: Tolworth Towers District Heating Requirements
14 January 2015 10:51:40
image001.png
Dear Mark,
Thank you for your email below enclosing your record of our discussions. There are a few points that
need clarification and I have amended you text to suit.
I trust this meets with your approval but if you have any queries please ring me.
Best Regards,
Les
Leslie J Smith
Managing Director
B.Tech (Hons), MCBISE, C Eng
cid:image005.png@01CF4E7A.A96CF320
Ashurst Manor, Church Lane,
Sunninghill, Ascot, Berks, SL5 7DD
T: +44 (0)1344 628821 | M: +44 (0)7973 922560 | DDI: +44 (0)1344 298853 | www.cuddbentley.co.uk
-- Cudd Bentley Consulting Ltd Confidentiality Notice -This electronic transmission, including any attachments may contain information which is confidential and/or privileged. If you are not the intended recipient of this
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Save a tree…………………....please don't print this e-mail unless you really need to
From: Taylor, Mark [mailto:mark.taylor@aecom.com]
Sent: 13 January 2015 15:54
To: Les Smith
Cc: Smith, Gill; Riley, Oliver; Nik Dyer
Subject: RE: Tolworth Towers District Heating Requirements
Dear Les,
Many thanks for running through the preliminary energy and sustainability strategy for the North
Wing and Tolworth Towers.
As explained the reason for contacting you was to ascertain what is proposed for the development of
Tolworth Towers, particularly in relation to the feasibility of an extended District Heating Network
(DHN) connection between the former Toby Jug site and Tolworth Towers.
I’ve written a summary of our conversation is below, please amend as you see fit:
· Both the North Wing and Tolworth Towers are in existence
· The North Wing originally provided office accommodation and is to be converted to
residential use under permitted development. · Tolworth Towers currently provides office accommodation some of which will be retained
and refurbished and a proportion of which will be converted to residential/ mixed use.
As such both of the sites are deemed to be refurbishment developments, with appropriate change of
use, and will comply fully with the latest version of the Building Regulations. Consequential
improvements will therefore apply to both sites.
The Tolworth Tower’s heating system will be upgraded to supply the office accommodation and the
individual residential units will be served via heat interface units from a central boiler plant. It is not
currently proposed that the central plant will incorporate a Combined Heat and Power (CHP) engine,
but it is feasible that the development could connect to a district heating scheme if one existed.
In considering a DHN to connect Tolworth Towers to the former Toby Jug site; there are lots of
physical barriers to creating this and very little potential given the established nature of the
surrounding area. It is unlikely to be either technically or economically feasible to create such a DHN
(should CHP be deemed feasible for the Tolworth Tower site).
I hope this has captured the essence of our discussion today.
Kind regards,
Mark
Policy extracts below
Kingston Core Strategy:
Where appropriate, other new build developments over 500m² including conversions, refurbishments, extensions and changes of
use are encouraged to achieve higher levels of the appropriate BREEAM standard in accordance with the following timeline:
Until 2013: BREEAM ‘Excellent’
·
From 2013 onwards: BREEAM Outstanding
·
Buildings that are undergoing refurbishment or extension, but where the alterations are too small to be assessed under BREEAM
are encouraged to comply with the policies for existing buildings set out in the Council’s Sustainable Design and Construction
SPD.
Residential Design SPD, Policy guidance 3 Sustainable Design:
In addition, developers should be aware of the need to comply with current Building Regulations regarding the conservation of
fuel and power in respect of both new and existing dwellings (Building Regulations Approved Document Part L (2010)
Mark Taylor, MSc Bsc (Hons) NDEA
Principal Energy Consultant, Energy Performance and Technology
D +44 (0) 117 917 1233 M +44 (0) 777 328 5952
EMEA Buildings & Places – Commercial Bristol
mark.taylor@aecom.com
AECOM
The Cresent Centre, Bristol, BS1 6EZ
T +44 (0) 117 917 1200 F +44 (0) 117 930 0342 Cisco 7076233
www.aecom.com
Twitter I Facebook I LinkedIn I Google+
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AECOM) and lines of communication currently remain the same unless specifically agreed or communicated
otherwise.
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otherwise protected under copyright or other applicable intellectual property laws. All information contained in this electronic communication is solely for the
use of the individual(s) or entity to which it was addressed. If you are not the intended recipient(s), you are hereby notified that distributing, copying, or in any
way disclosing any of the information in this e-mail is strictly prohibited. If you have received this e-mail in error, please notify the sender immediately, and
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Please consider the environment before printing this e-mail.
From: Nik Dyer [mailto:Nik.Dyer@cnmestates.com]
Sent: 12 January 2015 12:12
To: Taylor, Mark
Cc: Smith, Gill; Riley, Oliver; Les.Smith@cuddbentley.co.uk
Subject: RE: Tolworth Towers District Heating Requirements
Dear Mark,
Thank you for your email.
I have Cc’d in Les Smith our MEP Engineering consultant at Cudd Bentley who has been looking at the
overall sustainability strategy for our site. As I mentioned we are still in the early stages of developing
proposals, however please feel free to review your strategy with him.
Kind regards,
Nik Dyer
Development Manager, CNM Estates
T: +44(0) 208 3909265
Kingstons House, 15 Coombe Road
Kingston KT2 7AB, Surrey, UK
www.cnmestates.com
P Think before you print. DISCLAIMER: This email and its attachments may be confidential and are intended solely for the use of the individual to whom it is
addressed. Any views or opinions expressed are solely those of the author and do not necessarily represent those of CNM Estates. As
internet communications are not secure we do not accept legal responsibility for the contents of this message nor responsibility for any
change made to this message after it was sent by the original sender. We advise you to carry out your own virus check before opening
any attachment as we cannot accept liability for any damage sustained as a result of any software viruses.
From: Taylor, Mark [mailto:mark.taylor@aecom.com]
Sent: 12 January 2015 12:01
To: Nik Dyer
Cc: Smith, Gill; Riley, Oliver
Subject: Tolworth Towers District Heating Requirements
Dear Nik,
We spoke this morning regarding LBK/GLA’s requirement to consider district heating networks (DHN)
when submitting plans for planning consideration.
We are developing a strategy for the redevelopment of the former Toby Jug site (across the A3 from
Tolworth Towers). Within this strategy we are proposing a combined heat and power (CHP) engine to
supply heat and domestic hot water (DHW) to the flats within a local DHN that has the ability to
connect to a wider DHN.
LBK requires the feasibility of supplying heat to other sites in the immediate vicinity needs to be
investigated and as such it would be helpful for both sites to review their position regarding this
matter.
Gill Smith (cc’d to this email) is our planning and sustainability liaison, Oliver Riley (also cc’d) and
myself are leading on the technical aspects of the energy strategy.
Kind regards,
Mark
Mark Taylor, MSc Bsc (Hons) NDEA
Principal Energy Consultant, Energy Performance and Technology
D +44 (0) 117 917 1233 M +44 (0) 777 328 5952
EMEA Buildings & Places – Commercial Bristol
mark.taylor@aecom.com
AECOM
The Cresent Centre, Bristol, BS1 6EZ
T +44 (0) 117 917 1200 F +44 (0) 117 930 0342 Cisco 7076233
www.aecom.com
Twitter I Facebook I LinkedIn I Google+
Whilst AECOM and URS have become one company, contracting entities (all of which are now wholly owned by
AECOM) and lines of communication currently remain the same unless specifically agreed or communicated
otherwise.
This electronic communication, which includes any files or attachments thereto, contains proprietary or confidential information and may be privileged and
otherwise protected under copyright or other applicable intellectual property laws. All information contained in this electronic communication is solely for the
use of the individual(s) or entity to which it was addressed. If you are not the intended recipient(s), you are hereby notified that distributing, copying, or in any
way disclosing any of the information in this e-mail is strictly prohibited. If you have received this e-mail in error, please notify the sender immediately, and
destroy the communication and any files or attachments in their entirety, whether in electronic or hard copy format. Since data stored on electronic media
can deteriorate, be translated or modified, AECOM, its subsidiaries, and/or affiliates will not be liable for the completeness, correctness or readability of the
electronic data. The electronic data should be verified against the hard copy.
Please consider the environment before printing this e-mail.
This e-mail and any attachments contain AECOM confidential information that may be proprietary or privileged. If you receive
this message in error or are not the intended recipient, you should not retain, distribute, disclose or use any of this
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DISCLAIMER:This email and its attachments may be confidential and are intended solely for
the use of the individual to whom it is addressed. Any views or opinions expressed are solely
those of the author and do not necessarily represent those of CNM Estates. As internet
communications are not secure we do not accept legal responsibility for the contents of this
message nor responsibility for any change made to this message after it was sent by the original
sender. We advise you to carry out your own virus check before opening any attachment as we
cannot accept liability for any damage sustained as a result of any software viruses. "CNM
Estates" is a brand name and is not a Company. The brand name may only be used by CNM
Estates authorised trading companies.
Buildings & Places
Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
March 2015
APPENDIX E – PLANT ROOM LOCATION
ENERGY STRATEGY
March 2015
31
Buildings & Places
Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
March 2015
APPENDIX F – PLANT ROOM LAYOUT
ENERGY STRATEGY
March 2015
32
Buildings & Places
Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
March 2015
APPENDIX G – APPRAISAL OF RENEWABLE ENERGY
TECHNOLOGIES
In line with the Mayor’s Energy Hierarchy the feasibility of renewable energy technologies has been
carried out for the Proposed Development. Overall, there are a number of constraints associated
with the application site when considering their installation. Please refer to Section 8 and the table
below.
The following table presents a summary of the technologies considered unsuitable for the site. The
technologies have been considered as:
H – High feasibility;
M – Medium feasibility; significant issues would need to be addressed; and
L – Low feasibility; development site not suitable to support the technology.
Technology
Feasibility
H
1. Ground Source Heat
Pump (GSHP)
M
L

Comments
GSHP technology exploits seasonal temperature
differences between ground and air temperatures to
provide heating in the winter and air conditioning in
the summer.
GSHP systems use some electricity to run the heat
pump, but as most of the energy for heating is taken
from the ground, they produce less greenhouse gas
than conventional heating systems.
Pipe work is placed either horizontally or vertically in
the ground. Fluid pumped through the pipes takes up
heat which is then extracted by the heat pump and
released at a higher temperature to drive a space
heating system.
A detailed geological survey, including test boreholes,
would be required to verify the suitability of ground
conditions and accurately estimate the potential
capacity of GSHP scheme.
As the heat supply for the site will be delivered by the
proposed CHP system, GSHPs are not the preferred
option for the development.
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Buildings & Places
Technology
Feasibility
H
2. Air Source Heat Pump
(ASHP)
M
L

Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
March 2015
Comments
Air source heat pumps (ASHPs) absorb heat from the
ambient air outside buildings. Due to the way ASHPs
operate, they have efficiencies (Coefficient of
Performance) in excess of 100%.
The main advantages of ASHP are that it does not
require gas supply, ventilation and flue arrangements
and therefore the installation is straightforward.
However, heat pumps use electricity, a carbon
intensive energy source compared to natural gas.
Thus careful consideration of system sizing and
operation is required for reduction in CO2 emissions.
For the Proposed Development, following the GLA
Energy Hierarchy, the heat supply is proposed to be
largely delivered by the adopted CHP system, hence
ASHP technology is not considered suitable for this
site.
3. Solar Hot Water (SHW)
Systems

Active solar hot water technology uses the Sun’s
energy to heat fluid passing through a collector in an
active process.
For the Proposed Development, the roof will be fully
utilized from the PV panels and therefore there will be
no additional roof area available for further solar
technologies’ installation.
Moreover, the majority of the DHW demand will be
supplied by the proposed CHP unit and a SHW
system would compete with the load.
Therefore a solar hot water system is not considered
feasible for the site.
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Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
Buildings & Places
Technology
Feasibility
H
M
L

4. Wind Power
March 2015
Comments
Micro wind turbines can be fitted to the roof of any
selected building (given appropriate structural
measures).
Mast-mounted wind turbines can be located in an
open area away from obstructions such as buildings
and tall trees.
4
A report by BRE highlighted inherent problems and
the poor performance to date of urban micro wind
installations. Both technologies are considered
marginally viable in built environments by the majority
5
of small wind turbine manufacturers due to the
relatively low (and turbulent) wind speed prevailing in
an urban environment. The DECC database indicates
a predicted wind speed of 4.9 m/s @ 10m above
ground level at nearest postcode. See Appendix I.
Hence, due to the relatively low wind speed and lack
of suitable space in this built environment, the use of
these technologies is not considered feasible.
5. Biomass Heating

Biomass boilers work on the principle that the
combustion of wood chip or pellets can create heat for
space heating and hot water loads.
There are several factors that strongly disadvantage
this technology, namely:
•
•
On-site fuel storage space requirements;
The impact on local air quality (concerns exist
over the level of Nitrogen dioxide (NO2) and
particulate matter PM10 emissions from biomass
boiler installations, particularly in air quality
management areas) (See Appendix J);
• Fuel sourcing and the cost of fuel;
• Traffic movement and access arrangements for
regular fuel deliveries; and
• Regular
ash
removal
and
maintenance
requirements.
Biomass boilers are therefore not further considered
for the Proposed Development.
4
Micro wind turbine in urban environments, Richard Phillips, Paul Blackmore, Jane Anderson, Michael Clift, Antonio Aguiló-Rullán and
Steve Pester, BRE 2007 ISBN 978-1-84806-021-0.
5
A report by Poyry on behalf of Department for Energy and Climate Change concludes that a wind system of 1.5-15 kW would require
an average wind speed of 5.5 m/s to achieve circa 7% load factor.
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Buildings & Places
Technology
Feasibility
H
6.
Energy from Waste
M
L

Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
March 2015
Comments
Methane gas from sewage or waste can be captured
and used for firing boilers.
The Proposed Development will not generate
sufficient waste to make this option worthwhile.
Moreover plant space requirements and emissions
(air quality and odour) would be an issue. This option
is therefore not considered feasible.
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Buildings & Places
Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
March 2015
APPENDIX H – ROOF LAYOUT
Green highlighted areas indicate roof terrace locations. All other roof spaces can potentially be used for PV installation.
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Buildings & Places
Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
March 2015
APPENDIX I – WIND SPEED DATABASE
The postcode used is KT5 9NU.
Source: http://tools.decc.gov.uk/cgi-bin/nre/noabl1.pl
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Buildings & Places
Spenhill Developments Limited – King
George’s Gate, Kingston Road, Tolworth
March 2015
APPENDIX J – AQMA REGION
The Royal Borough of Kingston upon Thames is an AQMA in terms of NO2 and PM10.
Source: http://uk-air.defra.gov.uk/aqma/details?aqma_id=72
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