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Oakdale Primary School, Expansion Project Sustainability Statement
1 Hamson Barron Smith Tel: 01444 449400
www.hamsonbarronsmith.com
Peterborough City Council Oakdale Primary School – Expansion Project
Sustainability Statement
May 2017
ver. author date checked comment
1 KA 2017-05-19 TC Issued for Planning Approval
Oakdale Primary School, Expansion Project Sustainability Statement
2 Hamson Barron Smith Tel: 01444 449400
www.hamsonbarronsmith.com
CONTENTS
1.0 EXECUTIVE SUMMARY 3
2.0 INTRODUCTION 4
2.1 BUILDING REGULATION REQUIREMENTS - SCHOOLS 4
2.1.1 ASSESSMENT METHODOLOGY 5
2.1.3 WEATHER DATA 5
3.0 ENERGY COMPLIANCE 6
4.0 ANNEX – BRUKL DOCUMENT 9
Oakdale Primary School, Expansion Project Sustainability Statement
3 Hamson Barron Smith Tel: 01444 449400
www.hamsonbarronsmith.com
1.0 Executive summary
Hamson Barron Smith (HBS) have undertaken Building Regulations Part L2A compliance simulation of the proposed KS2 (Block N) teaching block extension at Oakdale Primary School.
The proposed extension is greater than 100m2 and exceeds 25% of the existing building’s floor area; hence, it triggers compliance requirement with Approved Document Part L2A.
Based on the current design proposals there is no requirement for a renewable energy system in order to comply with Building Regulations or any other planning criteria.
The appointed Contractor will carry out the technical design (RIBA Stage 4 onwards). The Contractor shall have the responsibility to produce a final design stage thermal model to achieve compliance with Building Regulations.
The attached BRUKL in the annex illustrates the energy performance of the proposed building is sufficient to meet the requirements of Building Regulations Part L2A (2013).
Oakdale Primary School, Expansion Project Sustainability Statement
4 Hamson Barron Smith Tel: 01444 449400
www.hamsonbarronsmith.com
2.0 Introduction
2.1 Building Regulation Requirements - Schools
This report demonstrates the thermal and energy performance of Block N at Oakdale Primary School. An
analytical study has been undertaken to establish whether the proposed MEP strategy satisfied the
requirements of Approved Document Part L2A of the Building Regulations.
Below are images of the thermal model.
Oakdale Primary analysis model– View from East
Oakdale Primary School, Expansion Project Sustainability Statement
5 Hamson Barron Smith Tel: 01444 449400
www.hamsonbarronsmith.com
Oakdale Primary analysis model– View from Northwest
2.1.1 Assessment Methodology
The analysis was carried out using IES Virtual Environment software, version 2017.
2.1.3 Weather data
CIBSE Norwich TRY2005 weather data has been used in these calculations as the nearest representative
weather file.
Oakdale Primary School, Expansion Project Sustainability Statement
6 Hamson Barron Smith Tel: 01444 449400
www.hamsonbarronsmith.com
3.0 Energy compliance
Building regulation requirements
Approved Document L2A (ADL2A) provides recommended means of compliance with the Building
Regulations requirement for conservation of fuel and power in new buildings. It states that in the
Secretary of State’s view, compliance with the energy efficiency requirements would be demonstrated by
meeting the five separate criteria set out in the Approved Document L2A.
Criterion 1 – Achieving an acceptable building CO2 emission rate
Criterion 2 – Limits on design flexibility
Criterion 3 – Limiting the effects of solar gain in the summer
Criterion 4 – Quality of construction and commissioning
Criterion 5 – Operating and maintenance instructions
ADL2A Compliance
The requirements of ADL2A apply to all areas of the new building.
Criterion 1 – Achieving an acceptable building CO2 emission rate
Building Emissions Rate (BER) has been calculated using IES Thermal Environment 2015, an approved
software tool.
Criterion 2 – Limits on design flexibility
Building Fabric
The as-designed construction U-values are as shown below:
Roof 0.18 W/m2.K
Wall 0.26 W/m2.K
Floor 0.22 W/m2.K
Window 1.6 W/m2.K
Oakdale Primary School, Expansion Project Sustainability Statement
7 Hamson Barron Smith Tel: 01444 449400
www.hamsonbarronsmith.com
Rooflight W/m2.K
Average window and rooflight glazing g-value shall be 40% and 55% respectively.
Air Permeability
An air-tight building envelope also contributes to minimising heat losses. The proposed air permeability
for side-lit spaces is 5 m3/h/m2 at 50 Pa. The proposed air permeability for top-lit spaces is 5 m3/h/m2 at
50 Pa. The limiting air permeability for all spaces in Part L is 10 m3/h/m2 at 50 Pa.
Heating
The proposed heating systems shall comprise new gas fired condensing boilers supplying low temperature
heat to each demise of the building via radiators. The proposed seasonal efficiency of gas boilers is 96%.
The radiators shall incorporate thermostatic valves to control the heating according to the desired room
temperature. Hence, heating to individual radiators shall be shut-off when room temperature is achieved
to save energy.
Hot Water
Domestic Hot Water is via electrically powered insulated point-of-use vessels. Hot water shall be provided
to the cleaner store and pupil WCs.
Lighting
The lighting proposed will be either T5 HF fluorescents or LED fittings, both of which have extremely high
efficacy of 84 Lumen/cW (minimum) and will come complete with PIR absence detection and daylight
dimming in all suitable areas. Building regulations 2013 requires over 60 Lumens/cW and also assumes
similar controls will be used.
Absence detection ensures that the lights will go out if there is nobody in the room, but will only come on
again when someone turns them on at the switch. Daylight dimming ensures the light fitting monitors
ambient light levels and dims or turns off when there is sufficient daylight in the space directly under the
particular fitting. This will enable lights adjacent to the windows or near a sky light to turn off. These
controls should reduce energy use from lighting by 35% in classrooms and up to 60% in WCs.
Ventilation
The proposed teaching classrooms shall be served by motorised weather louvres supplemented with
motorised openable windows. Mechanical supply and extract ventilation with heat recovery shall be
provided to the Pupil WCs. The extract ventilation system shall comprise a zonal extract fans with a
maximum specific fan power (SFP) of 0.5 Watts/lit/sec which is in line with the recommendation of Non-
domestic Building Services Compliance Guide.
Oakdale Primary School, Expansion Project Sustainability Statement
8 Hamson Barron Smith Tel: 01444 449400
www.hamsonbarronsmith.com
Renewables
No renewable systems shall be provided.
Criterion 3 – Limiting the effects of solar gain in the summer
For school buildings, the ADL2A refers to Building Bulletin 101 for guidance on methods to show compliance
with the requirement to control excessive solar gains. The ability to achieve thermal comfort shall be
demonstrated successfully by thermal modelling
Criterion 4 – Quality of construction and commissioning
Upon completion of each phase, the architect and main contractor shall provide evidence that the new buildings have been constructed and equipped such that the performance is in line with the predicted Building Emission Rating. A separate report shall be submitted providing evidence of compliance with this criteria, including results of the air permeability and pressure test.
The building services shall be commissioned in accordance with the requirements set out in the ADL2A. Refer to the Scope of Works document section on commissioning requirements for the main contractor. These shall be monitored by the building services consultants and all commissioning results included within the Operation and Maintenance manuals.
Criterion 5 – Operating and maintenance instructions
The building users shall be provided with information on the building, its fixed building services and their maintenance requirements as required by the ADL2A. These details shall be provided prior to hand-over. Refer to the Scope of Works document section on the Operation and Maintenance documentation to be provided by the main contractor.
Oakdale Primary School, Expansion Project Sustainability Statement
9 Hamson Barron Smith Tel: 01444 449400
www.hamsonbarronsmith.com
4.0 Annex – BRUKL Document
The BRUKL 2013 compliance document is attached at the end of this document.
BRUKL Output DocumentCompliance with England Building Regulations Part L 2013
Administrative information
Criterion 1: The calculated CO emission rate for the building should not exceed the target2
Criterion 2: The performance of the building fabric and the building services shouldachieve reasonable overall standards of energy efficiency
Project name
Date: Thu Apr 13 08:37:05 2017
As designedX008 Oakdale PS Pt L R01
Building DetailsAddress: Address 1, City, Postcode
Owner DetailsName: Name
Telephone number: Phone
Address: Street Address, City, PostcodeCertification toolCalculation engine: Apache
Calculation engine version: 7.0.6
Interface to calculation engine: IES Virtual Environment
Interface to calculation engine version: 7.0.6
BRUKL compliance check version: v5.2.g.3
Certifier detailsName: Name
Telephone number: Phone
Address: Street Address, City, Postcode
CO emission rate from the notional building, kgCO /m .annum2 22 18.7
Target CO emission rate (TER), kgCO /m .annum2 22 18.7
Building CO emission rate (BER), kgCO /m .annum2 22 18.1
Are emissions from the building less than or equal to the target? BER =< TER
Are as built details the same as used in the BER calculations? Separate submission
Element U U U Surface where the maximum value occurs*a-Limit a-Calc i-Calc
Wall** 0.35 0.26 0.26 NG000001:Surf[6]
Floor 0.25 0.22 0.22 NG000001:Surf[0]
Roof 0.25 0.18 0.18 NG000001:Surf[1]
Windows***, roof windows, and rooflights 2.2 1.59 1.6 NG000001:Surf[2]
Personnel doors 2.2 2.2 2.2 NG000015:Surf[7]
Vehicle access & similar large doors 1.5 - - No Vehicle access doors in building
High usage entrance doors 3.5 - - No High usage entrance doors in building
Building fabric
Values not achieving standards in the Non-Domestic Building Services Compliance Guide and Part L are displayed in red.
U = Limiting area-weighted average U-values [W/(m K)]a-Limit2
U = Calculated area-weighted average U-values [W/(m K)]a-Calc2 U = Calculated maximum individual element U-values [W/(m K)]i-Calc
2
* There might be more than one surface where the maximum U-value occurs.** Automatic U-value check by the tool does not apply to curtain walls whose limiting standard is similar to that for windows.*** Display windows and similar glazing are excluded from the U-value check.N.B.: Neither roof ventilators (inc. smoke vents) nor swimming pool basins are modelled or checked against the limiting standards by the tool.
Air Permeability Worst acceptable standard This building
m /(h.m ) at 50 Pa 3 2 10 5
Page 1 of 6
Whole building lighting automatic monitoring & targeting with alarms for out-of-range values YES
Whole building electric power factor achieved by power factor correction >0.95
Building services
The standard values listed below are minimum values for efficiencies and maximum values for SFPs.Refer to the Non-Domestic Building Services Compliance Guide for details.
1- LTHW Rads
Heating efficiency Cooling efficiency Radiant efficiency SFP [W/(l/s)] HR efficiency
This system 0.96 - 0.06 0 -
Standard value 0.91* N/A N/A N/A N/A
Automatic monitoring & targeting with alarms for out-of-range values for this HVAC system YES* Standard shown is for gas single boiler systems <=2 MW output. For single boiler systems >2 MW or multi-boiler systems, (overall) limiting efficiency is 0.86. For any individual boiler in a multi-boiler system, limiting efficiency is 0.82.
1- Elec DHW
Water heating efficiency Storage loss factor [kWh/litre per day]
This building 1 0.005
Standard value 1 N/A
Local mechanical ventilation, exhaust, and terminal units
ID System type in Non-domestic Building Services Compliance Guide
A Local supply or extract ventilation units serving a single area
B Zonal supply system where the fan is remote from the zone
C Zonal extract system where the fan is remote from the zone
D Zonal supply and extract ventilation units serving a single room or zone with heating and heat recovery
E Local supply and extract ventilation system serving a single area with heating and heat recovery
F Other local ventilation units
G Fan-assisted terminal VAV unit
H Fan coil units
I Zonal extract system where the fan is remote from the zone with grease filter
Zone name SFP [W/(l/s)]HR efficiency
ID of system type A B C D E F G H I
Standard value 0.3 1.1 0.5 1.9 1.6 0.5 1.1 0.5 1 Zone Standard
NG.06 Cleaners Store - - 0.5 - - - - - - - N/A
NG.05 Pupil WCs - - 0.5 - - - - - - - N/A
General lighting and display lighting Luminous efficacy [lm/W]
Zone name Luminaire Lamp Display lamp General lighting [W]
Standard value 60 60 22
NG.14 Lobby - 120 - 37
NG.01 Lobby - 120 - 24
NG.09 Classroom 84 - - 395
NG.11 Group Area 84 - - 165
Plant 84 - - 5
Store 84 - - 4
NG.03 Classroom 84 - - 386
NG.04 Classroom 84 - - 373
NG.07 Classroom 84 - - 368
Page 2 of 6
General lighting and display lighting Luminous efficacy [lm/W]
Zone name Luminaire Lamp Display lamp General lighting [W]
Standard value 60 60 22
NG.13 Classroom 84 - - 395
NG.12 Classroom 84 - - 376
NG.10 Classroom 84 - - 372
NG.08 Classroom 84 - - 391
NG.06 Cleaners Store 84 - - 10
NG.05 Pupil WCs - 120 - 149
NG.02 Circulation - 120 - 252
Criterion 3: The spaces in the building should have appropriate passive control measuresto limit solar gains
Zone Solar gain limit exceeded? (%) Internal blinds used?
NG.09 Classroom NO (-57.9%) NO
NG.11 Group Area YES (+41.4%) NO
NG.03 Classroom NO (-72.9%) NO
NG.04 Classroom NO (-54%) NO
NG.07 Classroom NO (-53.3%) NO
NG.13 Classroom NO (-58.6%) NO
NG.12 Classroom NO (-0.6%) NO
NG.10 Classroom YES (+0.8%) NO
NG.08 Classroom NO (-64.5%) NO
Criterion 4: The performance of the building, as built, should be consistent with thecalculated BER
Separate submission
Criterion 5: The necessary provisions for enabling energy-efficient operation of thebuilding should be in place
Separate submission
EPBD (Recast): Consideration of alternative energy systems
Were alternative energy systems considered and analysed as part of the design process? NO
Is evidence of such assessment available as a separate submission? NO
Are any such measures included in the proposed design? NO
Page 3 of 6
Technical Data Sheet (Actual vs. Notional Building)
Building Global Parameters Building Use
Actual NotionalArea [m ]2
External area [m ]2
Weather
Infiltration [m /hm @ 50Pa]3 2
Average conductance [W/K]
Average U-value [W/m K]2
Alpha value* [%]
* Percentage of the building's average heat transfer coefficient which is due to thermal bridging
782.82040.5NOR5688.610.3410
782.82040.5NOR3718.640.3510
% Area Building TypeA1/A2 Retail/Financial and Professional servicesA3/A4/A5 Restaurants and Cafes/Drinking Est./TakeawaysB1 Offices and Workshop businessesB2 to B7 General Industrial and Special Industrial GroupsB8 Storage or DistributionC1 HotelsC2 Residential Inst.: Hospitals and Care HomesC2 Residential Inst.: Residential schoolsC2 Residential Inst.: Universities and collegesC2A Secure Residential Inst.Residential spacesD1 Non-residential Inst.: Community/Day CentreD1 Non-residential Inst.: Libraries, Museums, and Galleries
100 D1 Non-residential Inst.: EducationD1 Non-residential Inst.: Primary Health Care BuildingD1 Non-residential Inst.: Crown and County CourtsD2 General Assembly and Leisure, Night Clubs and TheatresOthers: Passenger terminalsOthers: Emergency servicesOthers: Miscellaneous 24hr activitiesOthers: Car Parks 24 hrsOthers - Stand alone utility block
Energy Consumption by End Use [kWh/m ]2
Actual NotionalHeating
Cooling
Auxiliary
Lighting
Hot water
Equipment*
TOTAL*** Energy used by equipment does not count towards the total for calculating emissions.** Total is net of any electrical energy displaced by CHP generators, if applicable.
45.7701.364.8510.0512.9662.04
4301.2510.4110.9712.9665.64
Energy Production by Technology [kWh/m ]2
Actual NotionalPhotovoltaic systems
Wind turbines
CHP generators
Solar thermal systems
0000
0000
Energy & CO Emissions Summary2
Actual NotionalHeating + cooling demand [MJ/m ]2
Primary energy* [kWh/m ]2
Total emissions [kg/m ]2
148.57104.5418.1
133.4799.4518.7
* Primary energy is net of any electrical energy displaced by CHP generators, if applicable.
Page 4 of 6
HVAC Systems Performance
System Type Heat dem Cool dem Heat con Cool con Aux con Heat Cool Heat gen Cool genMJ/m2 MJ/m2 kWh/m2 kWh/m2 kWh/m2 SSEEF SSEER SEFF SEER
[ST] Central heating using water: radiators, [HS] LTHW boiler, [HFT] Natural Gas, [CFT] Electricity
Actual
Notional
149.2
134
0
0
46
43.2
0
0
1.4
1.3
0.9
0.86
0
0
0.96
----
0
----
[ST] No Heating or Cooling
Actual
Notional
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
----
0
----
Key to terms
Heat dem [MJ/m2] = Heating energy demandCool dem [MJ/m2] = Cooling energy demandHeat con [kWh/m2] = Heating energy consumptionCool con [kWh/m2] = Cooling energy consumptionAux con [kWh/m2] = Auxiliary energy consumptionHeat SSEFF = Heating system seasonal efficiency (for notional building, value depends on activity glazing class)Cool SSEER = Cooling system seasonal energy efficiency ratioHeat gen SSEFF = Heating generator seasonal efficiencyCool gen SSEER = Cooling generator seasonal energy efficiency ratioST = System typeHS = Heat sourceHFT = Heating fuel typeCFT = Cooling fuel type
Page 5 of 6
Key Features
The BCO can give particular attention to items with specifications that are better than typically expected.
Element U U Surface where the minimum value occurs*i-Typ i-Min
Wall 0.23 0.26 NG000001:Surf[6]
Floor 0.2 0.22 NG000001:Surf[0]
Roof 0.15 0.18 NG000001:Surf[1]
Windows, roof windows, and rooflights 1.5 1.5 NG000017:Surf[6]
Personnel doors 1.5 2.2 NG000015:Surf[7]
Vehicle access & similar large doors 1.5 - No Vehicle access doors in building
High usage entrance doors 1.5 - No High usage entrance doors in building
Building fabric
U = Typical individual element U-values [W/(m K)]i-Typ2 U = Minimum individual element U-values [W/(m K)]i-Min
2
* There might be more than one surface where the minimum U-value occurs.
Air Permeability Typical value This building
m /(h.m ) at 50 Pa 3 2 5 5
Page 6 of 6