97 A, LEA BRIDGE- LAYTON

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97 A, LEA BRIDGE- LAYTON Revised Energy Strategy, Commercial Units

HLEU 78084

Lea Bridge

Rev 0.1

14 September 2020

HLEU 78084 | Lea Bridge | Rev 0.1 | 14 September 2020

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Quality Management

Version Status Authored by Reviewed by Approved by Review date

0.1 Final ED AM AM 14-09-2020

Approval for issue

Alex Mozzaffari 14 September 2020

© Copyright RPS Group Plc. All rights reserved.

The report has been prepared for the exclusive use of our client and unless otherwise agreed in writing by

RPS Group Plc, any of its subsidiaries, or a related entity (collectively 'RPS'), no other party may use, make

use of, or rely on the contents of this report. The report has been compiled using the resources agreed with

the client and in accordance with the scope of work agreed with the client. No liability is accepted by RPS for

any use of this report, other than the purpose for which it was prepared. The report does not account for any

changes relating to the subject matter of the report, or any legislative or regulatory changes that have

occurred since the report was produced and that may affect the report. RPS does not accept any

responsibility or liability for loss whatsoever to any third party caused by, related to or arising out of any use

or reliance on the report.

RPS accepts no responsibility for any documents or information supplied to RPS by others and no legal

liability arising from the use by others of opinions or data contained in this report. It is expressly stated that

no independent verification of any documents or information supplied by others has been made. RPS has

used reasonable skill, care and diligence in compiling this report and no warranty is provided as to the

report’s accuracy. No part of this report may be copied or reproduced, by any means, without the prior

written consent of RPS.

Prepared by: Prepared for:

RPS Hill Partnership

Erieta Dimitriou

Principal Consultant- Energy & Sustainability

20 Farringdon Street

London, EC4A 4AB

T +44 20 3691 0500

E [email protected]


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Contents

1 INTRODUCTION ................................................................................................................................ 1

1.1 Scheme Overview .................................................................................................................... 1

1.2 Purpose of the Energy Assessment ......................................................................................... 1

1.3 Policy summary ........................................................................................................................ 2

2 ENERGY MODELLING – NEW BUILDINGS .................................................................................... 3

2.1 Energy Saving Measures ......................................................................................................... 3

2.2 Low and Zero Carbon Technologies (Green) .......................................................................... 5

3 CONCLUSIONS ................................................................................................................................. 7

Tables

Table 1: Summary of applicable policies................................................................................................ 2

Table 2: Achieved Passive design energy saving measures for the commercial units ......................... 4

Table 3: CO2 emissions after LZC for non-domestic buildings .............................................................. 5

Table 4: Site wide regulated carbon dioxide emissions and savings (SAP 2012) ................................. 6

Figures

Figure 1: Site plan location of the commercial units ................................................................................ 1

Figure 2: The three stages of the Energy Hierarchy ............................................................................... 3

Appendices

Appendix A PV details

Appendix B BRUKL Reports

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1 INTRODUCTION RPS Consulting Services Ltd (RPS) was commissioned by Hill Partnership to undertake a Revised

Energy Strategy and produce a statement for the commercial units of Lea Bridge development at

Beck Square, London. The proposed development includes the creation of 6 commercial units in

blocks C,D,E,F and G. This report will form part of post construction submission to Waltham Forest

Council.

This report establishes how the site has achieved compliance with Building Regulations and Local

Authority requirements. This has been achieved by following best practice procedures of the

London Plan’s Energy Hierarchy: be lean (improved building performance); be clean (centralised

heating and cooling systems); and be green (use of low or zero carbon technologies).

This Energy Report comprises:

• A scheme overview.

• A review of the planning context.

• As built energy and CO2 calculations of the development, following the energy hierarchy.

1.1 Scheme Overview

The development includes 6 commercial units on the ground floors of residential blocks C, D, E, F,

G in Layton, London.

Figure 1: Site plan location of the commercial units

1.2 Purpose of the Energy Assessment

The report has been written in accordance with the planning condition 34 ( previously 33) of the

development in relation to energy and CO2 reduction.

D E

F

G

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Condition 34. (PREVIOUSLY 33.)

Notwithstanding the Energy Strategy submitted with the planning application, a revised

Energy Strategy shall be submitted for the development and shall explain what measures

will be implemented in the construction of the development and shall justify any material

changes from the measures identified in the Energy Statement submitted with the

application.

The approved measures shall be fully implemented in accordance with the approved details

prior to the first occupation of any of the residential or commercial units of that phase hereby

approved.

A statement of verification from a suitably qualified expert shall be provided to the LPA and

agreed in writing to confirm compliance with the provided details prior to occupation of first

units.

1.3 Policy summary

In conclusion, compliance with a number of national, regional and local policy standards is

required for the proposed domestic and non-domestic buildings. These are presented in Table 1.

Waltham Forest Core Strategy Policy DMN 10 requires 40% reduction on-site CO2 emissions over

2010 building regulations which is equivalent to 35% against Part L building regulation 2013.

Table 1: Summary of applicable policies

Policy Level Standard Buildings

National Policies

National Planning Policy Framework All buildings

Building Regulations Part L1A Flats

Building Regulations Part L2A Commercial Units

Regional Policies

London Plan All buildings

Local Policies Waltham Forest Core Strategy, Policy DM10 All buildings

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2 ENERGY MODELLING – NEW BUILDINGS The National Calculation Method (NCM) for the Energy Performance of Buildings Directive (EPBD)

is defined by the Department for Communities and Local Government (DCLG) and it is the

procedure for demonstrating compliance with PART L of Building Regulations for buildings other

than dwellings. Depending on the complexity of the assessment, either the Simplified Building

Energy Model (SBEM) or Dynamic Simulation Methodology (DSM) can be used. Both of these

tools are Government approved. In order to identify the carbon dioxide emissions for this project, a

DSM assessment was carried out. The energy demand calculated using the NCM methodology is

relative to the Regulated Emissions which include the energy consumed to power space heating,

domestic hot water, cooling, ventilation and internal lighting systems. The unregulated emissions

(i.e. catering and computing) are calculated using benchmark figures detailed in technical

publications such as CIBSE guide A.

This report summarises all the measures undertaken to meet the planning condition 34 as follows:

• As Built DSM calculations

• EPC for all commercial blocks

All the above documents have been provided as final energy assessment step of the development.

The energy strategy approach is based on a recognised structure of reduction in carbon dioxide

emissions through:

1. Reducing the building energy consumption (Be Lean) by optimising the design and

construction of the building to ensure less energy is required.

2. Supplying the energy required in an efficient manner (Be Clean).

3. Supplying the energy from Low Zero Carbon and Renewable Energy Sources (Be

Green).

Figure 2: The three stages of the Energy Hierarchy

The construction and implementation of the passive and active strategies for this project attained

a final carbon emission rating that goes beyond the one required to comply with Part L 2013 of the

Building Regulations and Domestic and Non-domestic Building Services Compliance Guide 2013;

in line with the requirements of the Energy Hierarchy which Waltham Forest Council follows for all

new developments.

2.1 Energy Saving Measures

This development has maximised both passive and active design measures to reduce the energy

demand within the building.

The site location and weather were accounted for in the energy modelling by the use of the

London TRY local weather file, in accordance to Part L Building Regulations. The site is not

deemed to be located in an area with characteristics of a microclimate that would deviate from the

local weather file.

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The future occupants have been considered during the energy strategy by the use of appropriate

NCM templates, in accordance to Part L2A Building Regulations.

Building Fabric

To reduce the CO2 emissions of the development, it is important to minimise the heat losses

through the building fabric. In order to achieve this, U-values for all building fabric elements and

openings have been specified and implemented to meet the levels required by Building

Regulations. In addition, heat losses from infiltration have been minimised and a low air

permeability target has been achieved. The details of these measures are summarised in Table 2.

Table 2: Achieved Passive design energy saving measures for the commercial units

Element Constructed values Maximum values under Part L1A 2013

External wall 0.28, 0.15 and 0.30 W/m2K

0.30 W/m2K

Ground floor 0.11 W/m2K 0.25 W/m2K

Windows 1.5 W/m2K 2.00 W/m2K

Personnel doors 1.5 W/m2K 2.00 W/m2K

Air permeability 3 m3/hm2@50Pa 10 m3/hm2@50Pa

2.1.1 The glazing area of a building can have significant impact on heat losses, thermal comfort

and daylight levels. In addition, the installed windows have an average g-value of 0.5 and a

10% frame percentage.

Building Services

In addition to upgrading the insulation standards, it is important that the energy used within the

building is used efficiently. Therefore, the building systems have been provided to optimise the

efficiency of the systems by matching installed capacity to anticipated building demand. Items of

equipment, which make up the building’s mechanical building services installation, have been

specified to achieve high annual energy efficiency in operation and will be regularly serviced to

maintain their performance. Please note that all systems have efficiencies and controls which meet

or exceed the requirements of Part L2A:2013 Non-Domestic Building Services Compliance Guide.

According to GLA’s Guidance on preparing energy assessments, the ‘Be Lean’ case should

assume that the heating is provided by gas boilers (with an efficiency of 89.5% for residential and

91% for non-residential) and that any active cooling would be provided by electrically powered

equipment.

Due to the proposed activities in the commercial areas, heating as well as comfort cooling is

expected to be used. In order to minimise the carbon dioxide emissions from heating and cooling,

energy efficient reverse cycle VRF system with COP and SEER of 5 is used, in conjunction with

electric water heaters for domestic hot water.

The air quality within a building is significantly influenced by the ventilation system specified. To

ensure high air quality within the gym located on the ground floor of units G and F, a 75%

efficiency mechanical ventilation with heat recovery system has been specified, with low specific

fan power.

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Electrical lighting also represents a significant energy use within a building. To maximise energy

savings the installation of 100% low energy lighting (T5, LED etc) across the development has

been specified.

2.2 Low and Zero Carbon Technologies (Green)

This section discusses the feasibility of using low and zero carbon (LZC) technologies for the

proposed scheme. The London Plan, which the London Borough of Waltham Forest comes under,

aspires that all major developments reduce their carbon dioxide emissions through the use of on-

site renewable energy generation, where feasible.

In order to address the planning requirement (Policy 5.7 of the London Plan) for the integration of

LZC technologies on site, the installation of solar thermal panels, photovoltaics, wind turbines,

biomass and heat pumps was investigated.

After taking into consideration a number of different factors, including local authority requirements,

land use, potential noise impacts and available space within the development, it was concluded

that the best strategy for this development is the use of electric air source heat pumps (as

described in the previous section 2.1 Building Services). Units C1,C2, D1 (C4) and D2(C3) require

additional reduction in CO2 emissions to achieve the Waltham forest and London plan

requirements thus, photovoltaic panels have been incorporated on each one of them at a 30°

angle and facing south. Their total area is 50 square meters which equates to approximately 10.6

kWp (in total). Further information on the PVs used can be found in Appendix A.

Photovoltaics (PV) panels are an established form of renewable technology which converts solar

energy into electricity. The electricity is fed into an inverter which converts it from a direct current

supply to an alternating current supply, which can then be used to supply the demands within the

development / dwelling

A heat pump is a machine that moves heat from one location (at a lower temperature) to another

location (at higher temperature), using mechanical work or high-temperature heat source. The

main advantage of a heat pump over a conventional heating system is that very high efficiencies

can be achieved. In addition, heat pumps can also meet the cooling demand of buildings.

In order to achieve compliance with Part L2A 2013, the Building Emissions Rating (BER), must be

less than the Target Emissions Rating (TER). In accordance to Building Regulations Part L,

BER/TER figures for all commercial units assessed for the purpose of this assessment are

presented in Table 3.

Upon consideration of the LZC technology, the modelling identified that a reduction of 31.58

tnCO2/yr has been achieved for the regulated emissions. The total CO2 emissions for the

development are illustrated in Table 4. This equates to a 39.2% reduction in CO2 over regulated

emissions compared to the Baseline scenario. Therefore, it can be concluded that the planning

condition 34 requiring 35% carbon dioxide savings has been met.

Table 3: CO2 emissions after LZC for non-domestic buildings

CO2 emissions after LZC Technologies (Be Green) for non-domestic buildings

Area (m2)

TER Baseline

Total CO2 (kgCO2/m2/yr)

BER Total CO2 (kgCO2/m2/yr)

CO2 reduction (%)

Target CO2 reduction (%)

Has Waltham Forest Policy DM10 been met

Has London Plan been met

Commercial C1 138.8 32.6 20.5 37.11 35 Yes Yes

Commercial C2 182.7 29.0 17.8 38.62 35 Yes Yes

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CO2 emissions after LZC Technologies (Be Green) for non-domestic buildings

Area (m2)

TER Baseline

Total CO2 (kgCO2/m2/yr)

BER Total CO2 (kgCO2/m2/yr)

CO2 reduction (%)

Target CO2 reduction (%)

Has Waltham Forest Policy DM10 been met

Has London Plan been met

Commercial D1 (C3)

182.8 29.1 18.4 36.76 35 Yes

Yes

Commercial D2 (C4)

193.2 33.1 21.0 36.55 35 Yes

Yes

Café- Block E 243 86.5 45.3 47.6 35 Yes Yes

Gym- Blocks F&G

783.4 48.4 31.1 35.74 35 Yes Yes

Table 4: Site wide regulated carbon dioxide emissions and savings (SAP 2012)

Total regulated emissions

(Tonnes CO2/year)

CO2 Savings

(Tonnes CO2/year)

Percentage saving

(%)

Part L 2013 baseline 80.47

Be green 48.89 31.58 39.2 %

Overall Savings 31.58

In addition to reducing the total energy consumption, it is equally important to be able to

accurately measure the energy consumption and to allow for demand side response. Therefore,

in accordance to Building Regulations Part L the following provisions have been made:

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3 CONCLUSIONS This revised energy strategy has been produced in line with the energy hierarchy. Carbon dioxide

emission savings have been achieved through the following step process. The specified ‘Be Lean’

measures include improved building fabric and high specification systems. Moreover, ‘Be Clean’ /

‘Be Green’ measures on site include the installation of air source heat pump units and the

remaining carbon dioxide savings have been achieved through the inclusion of 10.6 kWp of PV

panels.

In conclusion, based on the measures outlined in the report, the development has achieved both

its sustainability and energy targets. It has been confirmed that a site wide 39.2% improvement on

2013 Building Regulations has been achieved which exceeds the 35% requirement.

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APPENDICES

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Appendix A

PV details

Area (m2) Efficiency (%) Inclination (°) Orientation

Commercial C1 12 17 30 South

Commercial C2 15 17 30 South

Commercial D1 (C3) 15 17 30 South

Commercial D2 (C4) 8 17 30 South

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Appendix B

BRUKL Reports

ENERGY REPORT


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97 A, LEA BRIDGE- LAYTON

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