Part of the BRE Trust

David Ross / Chris PountneyAECOM

England Building Regulations Part L 2013

Non-domestic buildings

08 October 2013

Content

• Target for 2013, trajectory to Zero Carbon in 2019

• Approach to Carbon Target Setting

• Costs and Benefits

• Other minor amendments to Approved Document L2A

• Changes to Approved Document L2B

Page 3

Zero Carbon

• Trajectory to Zero Carbon – 2013, 2016 and 2019

• Same Zero Carbon hierarchy as domestic

• Wide range of achievable reductions in non-dom buildings

• Hence greater need for “aggregate approach”

Page 4

Recap on 5 criteria for Part L2A compliance

1. Building Emission Rate ≤ Target Emission Rate (reg. 26)

2. Limits on design flexibility

3. Limiting the effects of solar gains in summer

4. Quality of construction & commissioning

5. Providing information / O&M instructions

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Cost / Benefit Analysis used to determine target

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Actual Building

Notional Building

BER

TER

Actual U-values and efficiencies

Actual size, shape, orientation, uses,

weather and system types but....

....notional U-values and efficiencies

Concurrent Notional Recipe Approach

Cost / Benefit Analysis used to determine target

Concurrent Notional Building Packages Modelled For Consultation

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Fabric

Element Unit Package A (2010

Notional)

Package B Package C Package D

Roof U-value (W/m2.K) 0.18 0.18 0.16 0.1

Wall U-value (W/m2.K) 0.26 0.26 0.20 0.20

Floor U-value (W/m2.K) 0.22 0.22 0.2 0.15

Window U-value (W/m2.K) 1.8 1.8 1.6 1.4

Window G-Value 40% (10% FF) 40% (10% FF) 40% (10% FF) 40% (10% FF)

Window Light transmittance 71% 71% 71% 71%

Roof-light U-value (W/m2.K) 1.8 (15% FF) 1.8 (15% FF) 1.6 (15% FF) 1.4 (15% FF)

G-Value 43% 43% 43% 43%

Roof-light Light transmittance 67% 67% 67% 67%

Air-permeability m3/m2/hour 5 3 3 3

Cost / Benefit Analysis used to determine target

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Building Services

Element Unit Package 1 (2010 Notional)

Package 2 Package 3

Lighting Luminaire lm/ circuit watt 55 65 65

Occupancy control Yes/no Yes Yes Yes

Daylight control Yes/no Yes Yes Yes

Heating efficiency Heating and hot water (side lit) 88% 91% 91%

Heating efficiency Heating and hot water (top lit)– i.e. gas-radiant spaceheating

86% 91% 91%

Central Ventilation SFP (w/l/s) 1.8 1.8 1.8

Terminal Unit SFP (w/l/s) 0.5 0.4 0.3

Cooling SEER 4.5 4.5 4.5

Heat recovery % 70% 70% 70%

Variable speed control offans and pumps

Yes/no – multiple sensors Yes Yes Yes

Demand control (mechvent only)

Yes/no – CO2 sensing withvariable speed

No Yes Yes

Aggregate Approach – Percentage reduction on 2010 for notional building package

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A1 A2 A3

Warehouse (Distribution) 0.0% 5.6% 8.0%

Office (Deep-plan, AC) 0.0% 11.9% 19.5%

Warehouse (Retail) 0.0% 6.8% 10.9%

Office (Shallow-plan, AC) 0.0% 12.2% 18.9%

Hotel (5-star) 0.0% 8.8% 11.6%

Secondary School 0.0% 8.3% 10.6%

Aggregate 0.0% 8.8% 13.5%

Results – Percentage improvement on Part L 2010

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A1 A2 A3

0.0% 8.8% 13.5%

B1 B2 B3

1.6% 10.3% 15.0%

C1 C2 C3

3.8% 12.3% 17.1%

D1 D2 D3

6.2% 14.7% 19.4%

Proposed Notional building packages

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Targetaggregatereduction

8%Resultant

target reduction

11%Resultant

target reduction

14%Resultant

target reduction

20%Resultant

target reduction

Warehouse(distribution) A2 5.6% B2 8.9% C3 16.1% C3+1.6% 20.1%

Office (Deep-plan, AC) A2 11.9% A2 11.9% A2 11.9% A3+1.6% 23.4%

Warehouse(Retail) A2 6.8% B2 8.0% C3 13.6% C3+1.6% 16.2%

Office (Shallow-plan, AC) A2 12.2% A2 12.2% A2 12.2% A3+1.6% 23.1%

Hotel (5-star) A2 8.8% C2 11.0% C2 11.0% C3+1.6% 15.0%

SecondarySchool A2 8.3% C2 11.0% C2 11.0% C3+1.6% 17.4%

PV required on notional building

None None None

Panel area equivalent to 1.6% of floor area

applied to roof of each building

Cost / Benefit Analysis used to determine target

Carbon Abatement Curve

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Resultant Notional Building for 9% aggregate reduction

Page 13

Element Side lit or unlit (Heating only)

Side lit or unlit (Includes cooling)

Toplit

Roof U-value (W/m2.K) 0.18 0.18 0.18Wall U-value (W/m2.K) 0.26 0.26 0.26Floor U-value (W/m2.K) 0.22 0.22 0.22Window U-value (W/m2.K) 1.6 (10% FF) 1.6 (10% FF) N/AG-Value (%) 40% 40% N/ALight Transmittance (%) 71% 71% N/ARoof light U-value (W/m2.K) N/A N/A 1.8 (15% FF)G-Value (%) N/A N/A 55%Light Transmittance (%) N/A N/A 60%

Resultant Notional Building for 9% aggregate reduction

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Element Side lit or unlit (Heating only)

Side lit or unlit (Includes cooling)

Toplit

Air-permeability (m3/m2/hour), note: GIA = Gross Internal AreaGIA ≤ 250m2 5 5 7250m2 < GIA ≤ 3,500m2 3 3 73,500m2 < GIA ≤ 10,000m2 3 3 510,000m2 < GIA 3 3 3

Resultant Notional Building for 9% aggregate reduction

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Element Side lit or unlit (Heating only)

Side lit or unlit (Includes cooling)

Toplit

Lighting Luminaire (lm / circuit watt) 60 60 60

Occupancy control (Yes/No) Yes Yes YesDaylight control (Yes/No) Yes Yes YesMaintenance Factor 0.8 0.8 0.8Constant illuminance control No No No

Resultant Notional Building for 9% aggregate reduction

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Element Side lit or unlit (Heating only)

Side lit or unlit (Includes cooling)

Toplit

Heating efficiency 91% 91% 91%Central SFP (W/l/s) 1.8 1.8 1.8Terminal Unit SFP (W/l/s) 0.3 0.3 0.3Cooling (SEER / SSEER) N/A 4.5 / 3.6 4.5 / 3.6Cooling (mixed mode) (SSEER) N/A 2.7 2.7

Heat recovery efficiency (%) 70% 70% 70%Variable speed control Yes Yes YesDemand control ventilation Yes Yes Yes

Other Minor Changes to AD L2A

Treatment of Lighting

• 2010– Actual design lux level irrelevant – rebased to notional building

value.– So supermarket designed to 2000 lux, rebased to notional building

800 lux.

• 2013– Actual installed lighting wattage used so penalising overlit spaces.– Maintenance factors are assumed in the notional and should be

included in calculated values in the actual– Constant illuminance controls are available in the actual– LENI method can be used to show compliance with Criterion 2

Page 17

Other Minor Changes to AD L2A

Treatment of District Heating

• 2010– Notional CO2 emission factor for heat supplied from district heating

same as in actual. – Little carbon benefit from connection to district heating.

• 2013– Minimum CO2 emission factorapplied to notional building.– Allows carbon benefit where efficient district heating is employed.

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0

0.05

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0.15

0.2

0.25

0.3

0 0.05 0.1 0.15 0.2 0.25 0.3

Not

iona

l CO

2 Fa

ctor

(kgC

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m²)

Actual CO2 Factor (kgCO2/m²)

Other Minor Changes to AD L2A

Removal of Accredited Construction Details (ACDs)

• No quality assured accredited construction details schemes have been approved by the Secretary of State.

• The confidence factor of 0.02 W/mK or 25 per cent is no longer applied.

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Changes to AD L2B

• No change to the fabric standards for replacement or renovation

• See separate presentation on the Non-Domestic Building Services Compliance Guide

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