DT774a - ENERPHIT SCHOOL
Colette Harold
PROJECT
D12124981
P LAN
STUDENT
TOILETS
&
E LE VATI O N S
OFFICE
LIBRARY
STUDENT
TOILETS
STAFF
PLANT
PLANT
ENTRANCE
HALL
CLOAKS / LOCKERS
CLOAKS / LOCKERS
ENTRANCE
ENTRANCE
CLASSROOM 1
CLASSROOM 2
CLASSROOM 3
LAYOUT PLAN
NORTH-EAST ELEVATION
SOUTH-WEST ELEVATION
ENTRANCE
HALL
NORTH-WEST ELEVATION
SOUTH-EAST ELEVATION
CLASSROOM 4
STAFF
SECTION
Main pitched roof extended over flat roof to corridor.
High level windows to rear of classroom blocked up.
Mineral wool Insulation added at ceiling level to existing
attic and over existing flat roof
Phenolic foam external insulation system applied to all
walls, and carried down to top of foundations.
External cavity filled with platinum polystyrene bead
insulation
Munster Joinery - PassiV Future
Proof triple glazed windows with
True Window Planitherm
4/20/4/20/4 Argon 90% glazing
used throughout.
Corridor wall cavity filled with
Foam expanding insulation.
Existing floors removed.
Rigid polystyrene insulation laid under new
concrete floors throughout.
BUILDING FABRIC
MEASURES
EXISTING CAVITY WALL UPGRADE MEASURES
weber.therm XP (Mesh) External Wall Insulation System, comprising
mechanically-fixed phenolic (PHS) boards with a mesh reinforced
one-coat render, which is suitable for use on new or existing domestic
and non-domestic buildings.
The thermal conductivity ’λ. value’ of the Webertherm PHS Phenolic
Insulation at thicknesses greater then 45mm is 0.020W/mK
EXISTING CLASSROOM GABLE CAVITY WALL UPGRADE MEASURES
EcoBead Platinum Cavity Wall
Insulation consists of an expanded
polystyrene material which is injected
in bead form with a binding agent into
the cavity walls.
The thermal conductivity ’λ. value’ of
the EcoBead Platinum Cavity Wall
Insulation material may be taken as
0.033 W/mK for the purpose of U
value calculations.
BUILDING FABRIC
MEASURES
EXISTING FLOOR UPGRADE MEASURES
Existing floors removed.
Rigid Kingspan Styrozone H350R
polystyrene insulation laid under new
concrete floors throughout.
The boards achieve a thermal conductivity
of 0.031W/mK at thicknesses over 120mm
EXISTING PITCHED ROOF UPGRADE MEASURES
Two layers ISOVER Metac mineral wool Insulation roll, one laid between
existing joists, and one above to give a total thickness of 350mm.
Thermal conductivity 0.034W/mK
BUILDING FABRIC
MEASURES
EXISTING FLAT ROOF TO PITCHED ROOF UPGRADE MEASURES
Two layers ISOVER Metac mineral wool Insulation roll,
laid over existing flat roof, which has now become an
internal element in new pitched roof over corridor.
EXISTING CLASSROOM / CORRIDOR
CAVITY WALL UPGRADE MEASURES
Biofoam 2700sp Injection Foam
insulation is a polyurethane foam
injected into the cavity in the corridor
walls. This results in improved airtightness to this wall.
90% Closed cell
Light Weight and high density.
Low Thermal Conductivity
0.032W/mK
WINDOWS AND DOORS
EAV E S D ETAL
INDICATES AIR-TIGHTNESS
INDICATES WIND-TIGHTNESS
C I LL / G R O U N D F LO O R J U N CTI O N D ETAI L
INDICATES AIR-TIGHTNESS
INDICATES WIND-TIGHTNESS
CORRIDOR WALL
D ETAI L
INDICATES AIR-TIGHTNESS
ISOVER Comfort Panel 32
A high performance mineral wool
insulation panel for use around window
heads, and behind service voids.
U P G RAD E D F LAT R O O F
THIS ROOF DETAIL APPLIES TO FLAT ROOF
OVER CORRIDOR AND TO BOTH SIDE
OFFICE/TOILET BLOCKS.
INDICATES AIR-TIGHTNESS
INDICATES WIND-TIGHTNESS
1590 mm
CALC U LAT E D LI N EAR T H E R MAL B R I D G E D E TAI LS
4530 mm
1914 mm
1530 mm
LTB 1 INSULATED
EXTERNAL WALL WITH
FLOOR SLAB
LTB 2 INSULATED FLAT
ROOF/CEILING WITH
CORRIDOR WALL
PROPOSED MVHR
Extract only to toilets in each cubicle. Air
drawn in through transfer grilles in doors
from corridor.
Extract from office via corridor under door
or through transfer grilles.
Supply ducts @250 Ø to classrooms in roof
space over
HEATING LOAD
PHPP heating load sheet indicates that the
heating load will be met by the MVHR system
However a small radiator will be provided in each
area for possible additional heating requirements.
1 no. Aerosilent Centro 1200 MVHR unit situated in new plant room
adjacent to re-arranged staff and student toilets.
The total building Supply air requirement is1575m³/h, the Aerosilent
Centro 1200 can supply up tp 1400m³/h , however it will in reality only
need to supply approx 1200m³/h as a second , smaller CWL - 400 - Wolf
MVHR unit can supply up to 400m³/h at 83% efficiency , and serves the
library and second toilet areas at the other side of the school
DHW + DISTRIBUTION
Hot water, and heating if required, is supplied by a
new oil condensing boiler.
Heating distribution flow and return pipe work to
zoned central heating is 186m in length.
The length of DHW distribution pipe-work is 112m
with branch pipes to each sink totalling 34m.
APPROACH
TO
ACHIEVE
ENERPHIT
STAN DAR D

Improvements to external wall fabric through the application of external wall insulation tasking the wall U values up from 1.735W/(m²K) and
1.504W/(m²K), to 0.079W/(m²K) & 0.078W/(m²K)

Floors, both suspended and existing concrete, replaced throughout with new highly insulated concrete floor to give U value of 0.101W/(m²K).

New pitched roof to each side wing, extend existing pitched roof over corridor flat roof.

All windows replaced in their existing locations, with same openings to triple glazed UPVC with overall window U value of 0.07W/(m²K).

Provision of a Mechanical heat recovery ventilation system.
System chosen 1 no. Aerosilent Centro 1200 MVHR unit situated in new plant room adjacent to re-arranged staff and student toilets,
and a second , smaller , PAUL Novus 300 MVHR unit serves the library and second toilet areas at the other side of the school .Supply air
requirement of 1575m³/h. Aerosilent Centro 1200 MVHR unit can supply up to 1400m³/h at 84% efficiency and CWL - 400 - Wolf unit can
supply up to 400m³/h at 83% efficiency. PHPP heating load sheet indicates that the heating load will be met by the MVHR system
However a small radiator will be provided in each area for possible additional heating requirements.

Air-changes set at 1.0 1/h

Overheating due to solar gain has been handled mainly by adding blinds to windows, giving a reduction factor for temporary shading in
summer in shading-s sheet, ventilation running without heat recovery during the summer, and additional summer controlled mechanical
ventilation at night.

Motion sensor, and, daylight sensitive lighting controls that turn lights off, have been utilised to reduce lighting energy consumption.
Classroom Fittings will T5 (16mm) tubular fluorescent lamps as recommended by the department of education. Corridor lighting should be
linear fluorescent and zoned with appropriate local individual light switches and where appropriate daylight detection/absence detection
controls.
Daylight levels have not been improved upon in this instance as the roof would require too much modification to install sufficient roof-lights
Light shelves could be used to bounce light further into rooms to further reduce the lighting loads.

Provision of 10m² of solar panels to provide 41% of DHW requirements

Linear thermal bridges have been addressed in the detailing of insulation layers. 2 specific details have been calculated.

Space heating reduces to 22 kWh/(m²a)

Heating load reduces to 14 kWh/(m²a)

Primary energy reduces to 117 kWh/(m²a)
LIGHT SHELVES
Efficient and accurate distribution of light
Deeper penetration of glare-free natural daylight
Shelf is easily rotated downward for cleaning, without the use of tools, and is
resistant to dust collection.
Lightweight construction can attach to virtually any window system
Installed in single sections or continuous runs
Highly reflective surface directs more light into space
Sustainable design contributes to multiple LEED® credit strategies
SOLAR HOT
WATER
Provision of 10m² of flat plate solar
collectors on south east facing roof
at a pitch of 41° gives a 41%
contribution to school hot water
requirements.
PHPP IMPROVEMENT PROGRESSION CHART
PHPP OVERALL
IMPROVEMENT
SCHOOL BASE PHPP
Very little passive solar gains
Huge Annual heating demand
CHANGES IN HEATING ENERGY BALANCE BETWEEN BASE AND FINAL PHPP
SCHOOL UPGRADED PHPP
88% IMPROVEMENT IN VENTILATION LOSSES
75% IMPROVEMENT IN LOSSES FROM WINDOWS
82% IMPROVEMENT IN LOSSES THROUGH GROUND FLOORS
89% IMPROVEMENT IN LOSSES THROUGH ROOF
94% IMPROVEMENT IN ANNUAL HEATING LOAD
INTRENAL GAINS REMAIN THE SAME
30% REDUCTION IN PASSIVE SOALAR GAINS