How do you BIM an existing building?
South West BIM Hub
Ben Rouncefield-Swales
URS – Sustainable Design & Construction
ben.rouncefield-swales@urs.com
07917 898548
URS - Overview
• One of the world’s leading engineering,
construction and technical services firms.
• Focuses on four key markets:
•
•
•
•
Infrastructure
Governments
Power
Industrial & Commercial
• Fully integrated services support full project
lifecycle.
• Serves federal, national, state and local
government agencies, FORTUNE 500
companies and other multinational corporations.
• Approximately 57,000 employees in more than
50 countries worldwide.
Rapid Energy Modelling
2
Who cares about existing buildings?
Buildings are responsible for 40% of global energy demand
But 70% of all buildings in 2050 are already built
Rapid Energy Modelling
What are the Drivers for Change?
Energy costs drive
landlords to improve
the thermal efficiency of
their existing building
stock
Rising energy costs will
force occupiers to adopt
sustainable operations
and improve the
efficiency of M&E
equipment
The Green Deal
intended to stimulate the
improvement of energy
efficiency in existing
buildings
Rapid Energy Modelling
The EPBD - net-zero
energy by 2019 for all new
buildings, and carbon
neutrality by 2019 for all
new commercial buildings
Unable to let E rated
buildings from April 2018
Research shows higher
rental income secured for
buildings with sustainability
credentials
Carbon Liability: schemes
like the CRC require private
and public energy users to
pay a tax on their energy bill
What is happening now?
• Traditional energy audits
• Cost can vary depending upon level of output required
• Some modelling may be done for high investment items – usually at design
stage
• More involved AM&T contracting
• High cost and long contract periods
• Creates good data but still need to work up into opportunities
• Typically outputs are data not models
• Energy Performance Contracting
• Investment grade energy audit
• Detailed modelling to underpin finance
• No initial cost to client but pays through savings
• Do It Yourself
• Success varies depending upon in-house skills
• Unlikely that any modelling would be done
Rapid Energy Modelling
That’s why URS developed REM
• Rapid Energy Modelling
• A tool developed by URS in
partnership with AutoDesk
• Uses innovative means to
quickly construct a 3D model of
the building
• Physical Audit feeds
information into the model
• ReVit models the building and
tests improvement measures
• Ouptut leaves a legacy model
for the building
Rapid Energy Modelling
MANAGE
PLAN
BUILD
DESIGN
The REM process
Information
capture
Computer
model
Building
performance
• Physical audit of building
• 3D geometry capture (multiple approaches)
• 3D geometry defined
• Building characteristics identified: fabric, services and systems
• Location, climate and occupancy profiles
• Modelling engine produces simulation
• Energy required for heating, cooling, lighting, hot water etc.
• Model is modified to represent improvements
Improvement • Results illustrate benefits in energy reduction and emissions
simulation
Rapid Energy Modelling
Space
heating
1%
Pumps &
Aux
4%
Space
cooling
11%
Lights
40%
Misc
equipment
35%
Fans
8%
Exterior
loads
1%
Laser scanning
Rapid Energy Modelling
Photogrammetry
Rapid Energy Modelling
3D sketching
Rapid Energy Modelling
Rapid Response
• From a floor plan – in 30
minutes
• Generated from 2D plans
& elevations using
AutoCAD, Revit, Vasari,
Google Sketchup etc.
Rapid Energy Modelling
• From the laser scan – in 2
hours
• No drawings required –
photogrammetry builds a 3D
model
Immediate decision making
Rapid Energy Modelling
Option & Sensitivity Studies - Readily Undertaken
Unimproved
With external shading
Alter key building elements
and observe impact on energy
& CO2 outputs and also quality
of internal space
Rapid Energy Modelling
Example output - recommendations
6000
700
5000
600
Net Specific Cost…
Cumulative CO2…
4000
500
3000
400
2000
300
1000
200
0
100
-1000
1
3
5
4
7
6
2
Short Term
1
3
5
4
7
6
2
8
12
13
9
10
Space set points on heating system
Time clock on water heaters
Replace boilers
Upgrade time clock system
Daylight dimming system
Install PIR control
Variable Speed Drives
Repair Damaged windows
Lighting zoning and control system
TRVs
Reduce door air leakage
Adapt T8 to T5 light fittings
Rapid Energy Modelling
8
12 13
9
10 17 16 14 19 18 23 21 20 22 24 15
Medium Term
17
16
14
19
18
23
21
Solar Thermal
Thermal performance – Ext. Walls
Energy heat meters
Photo Voltaics
Thermostat & time control
Occupancy sensing on cooling
Thermal performance - Roof
0
Strategic
20
22
24
15
Upgrade lighting to LED
Draft lobby at main entrance
Thermal performance-windows
Slave Terminals
Cumulative CO2 Savings
Net Specific Cost £/tCO2
Marginal Abatement Cost Curve
Case Study
18
City of London office - introduction
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•
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Late-Victorian office
Multi-tenanted
Circa 3,500 m2
7 stories
Energy spend c. £50k p.a.
Rapid Energy Modelling
City of London office – REM
•
•
•
•
Site visit circa 3 hours
Photogrammetry model
Rapid Energy Model created
Accuracy <10% difference
Space Cooling,
5.9%
Lights, 25.4%
Space Heating,
7.3%
Fans, 3.5%
Heat Pumps,
11.6%
Exterior loads,
2.0%
*
Misc
equipment,
44.3%
*includes small power, computers, communications equipment, printers etc
Rapid Energy Modelling
City of London office – Improvement Recommendations
Low Cost, Quick Wins
Medium Cost
Strategic
Energy cost saving (p.a.)
£ 10,260
£ 9,570
£7,550
Carbon emissions saving (p.a.)
21%
19%
15%
Specific improvement measures
Review and implement Good Practice
recommendations (behaviour &
operation)
Install Voltage Optimisation Unit
Upgrade lighting to LED lamps in
appropriate areas
Install time clock on water heaters
Install lighting PIR occupancy control
Install occupancy sensing on cooling
systems within meeting rooms
Interconnect existing control systems
Install daylight dimming system
Install thermostat and time control on
electric panel heaters within
communal parts
Adapt T8s to T5s in main office
Replace laptops / docking stations /
terminals with "mainframe" and slave
monitor and keyboard terminals
Implement energy metering strategy
Replace centralised hot water with
point of use hot water supplies
Rapid Energy Modelling
City of London office – Improvement Recommendations
60
350
Energy cost
Carbon
300
250
40
200
30
150
20
100
10
50
-
Benchmark
Rapid Energy Modelling
Current Building
Low Cost Quick
Wins
Medium Term
Strategic
CO2 (tonnes p.a.)
Energy cost (£k p.a..)
50
REM experience across the Built Environment
• REM studies
undertaken since
March 2011
• Accuracy
consistently <±10%
• Average CO2 and
energy savings
identified circa 40%
URS Nottingham
Office and Labs
Oxford University
URS Basingstoke
AB InBev Belgium
Manchester Council
Student Accom.
Office
Office
Office (Nat vent)
AB InBev Bremen
Oxford University
Gateshead
Office
Student Accom.
Major Property Man.
Office (Period)
Rapid Energy Modelling
Housing Block
Summary
24
Key issues
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•
•
•
Lots of buildings – most already built
Poor understanding of building performance
Traditional audit / survey take a long time
Need to act now to meet commercial imperatives:
• Delivering cost savings
• Improving energy performance
• Enhancing working environment
• Reducing carbon emissions
Rapid Energy Modelling
What benefits will REM bring?
• It helps reduce a building’s energy running costs
and CO2 emissions
• It provides a rapid focus on building improvement
options
• It is a Building Information Modelling (BIM)
process, creating a legacy model that can be
retained and refined
• Improves building user environment
Rapid Energy Modelling
Thank You
Ben Rouncefield-Swales
Associate
URS – Sustainable Design & Construction
ben.rouncefield-swales@urs.com
07917 898548
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