peterborough city council oakdale primary school expansion ......oakdale primary school, expansion...

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




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




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).




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 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.




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




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.




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.




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




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.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.04 Classroom NO (-54%) NO




NG.10 Classroom YES (+0.8%) 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

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