Checklist A5

See Up to four credits – Basic route (option 2): Energy efficient design features.

To award credits all the criteria for that credit AND any previous credit(s) must have been achieved or filtered out. To get all four of the available credits from Checklist A5 all applicable criteria must have been achieved.

Table 69: Criteria to award credits using the energy efficient features checklist (Checklist A5)

Credits

Lighting

 Hot water LZC Building fabric Heating Cooling and ventilation
1

Criterion 1 (Non-residential)

Criterion 3 (Residential)

 Criterion 7 - Criterion 10 Criterion 16

Criterion 17 (Residential)

Criterion 18

Criterion 21 (Non-residential)
2

Criterion 2 (Non-residential)

Criterion 4 (Residential)

 Criterion 8

Criterion 13

Criterion 15

Criterion 19 (Non-residential)

Criterion 20 (Residential)
3 Criterion 5 (Residential - Multiple dwellings) Criterion 9

Criterion 11

Criterion 14

 Criterion 22 (Non-residential)
4

Criterion 5 (Residential - Single dwellings)

Criterion 6 (Residential - Multiple dwellings)

 Criterion 12

Table 70: Checklist A5 - Energy efficient features for assessments using the basic route (option 2) in Ene 01

Ref

Energy efficient features - Criteria and notes

 Building type
Lighting
1

Internal daylit and non-daylit areas have switching controls that take account of absence or occupancy, or daylighting as recommended by ASHRAE Standard 90.1 and the California Energy Code.

 

Adequate lighting controls must be provided to all ancillary areas (as applicable) such as:

  1. Storerooms and cold stores.
  2. Plant and control rooms.
  3. Toilet, washroom, and shower areas.
  4. Circulation areas, corridors, and stairwells.
Non-residential
2

Where at least 80% of general internal luminaires in fixed fittings achieve an efficacy of at least 80 luminaire lumens per watt or greater.

 

Note: General internal lighting refers to all internal light fittings, but excludes those used for emergency purposes. The assessor should note that the benchmark is for individual fittings, not the average lumens per circuit watt.

3

An information leaflet explaining efficacy in terms of lighting and the benefits of purchasing high efficacy Low Energy Lamps (LELs) is provided in each dwelling.

Residential
4

75% of the fixed internal fittings as a percentage of the total number of fixed light fittings within habitable rooms have been fitted with LELs.

 

See note on habitable rooms below.

5

100% of the fixed internal fittings as a percentage of the total number of fixed light fittings within habitable rooms have been fitted with LELs.

 

Note: Habitable rooms are defined as follows:

  1. Living rooms or dining rooms
  2. Kitchen or utility rooms
  3. Bedrooms
  4. Hallways
  5. Studies
  6. Offices
  7. Playrooms, games rooms or leisure rooms
  8. Bathrooms
  9. WCs.
6

All internal space lighting in the communal areas, excluding statutory safety lighting, has fixed fittings fitted with:

  1. LELs
  2. Movement detecting control devices (PIR)
  3. Daylight cut-off sensors OR timers.

 

Note: For residential lighting criteria, LELs are deemed as bulbs that have a luminous efficacy greater than 65 lumens per circuit watt.

Residential - Multiple dwellings
Water heat generator efficiency
7

Hot water is supplied via a self-contained system that has an efficiency of ≥ 85% (either central or decentralised) OR where decentralised gas fired storage heaters are specified that have an efficiency of ≥ 85%.

OR

Where heat pumps are specified for hot water the criteria can be awarded provided that the COP is ≥ 4.5.

 

Note: The water heating system is designed in accordance with the recommendations of ASHRAE Standard 90.1 and the controls specified comply with the guidance for hot water systems. Where the building is not heated, this criterion is not applicable.

All buildings
Low and zero carbon technologies
8

At least 10% of the total electricity or heating and cooling demand is generated by on-site or near-site LZC technologies.

 

See note on LZC technologies below.

All buildings
9

At least 20% of the total electricity or heating and cooling demand is generated by on-site or near-site LZC technologies.

 

Note: The low and zero carbon technologies listed in BREEAM issue Ene 04 Low carbon design can be used to demonstrate compliance. Other systems may be acceptable as part of a LZC strategy under this issue but are not inherently considered as LZC technologies. Acceptability will be dependent on the nature of the system proposed. The BREEAM Assessor must confirm acceptability with BRE Global if in doubt.
Building fabric
10 5% improvement on the U-value requirements for walls, roofs, ground floor, windows, and doors, in ASHRAE Standard 90.1 (for all buildings except low rise residential buildings) or ASHRAE Standard 90.2 (for low rise residential buildings). All buildings
11 10% improvement on the U-value requirements in ASHRAE Standard 90.1 or 90.2 (as applicable).
12 15% improvement on the U-value requirements in ASHRAE Standard 90.1 or 90.2 (as applicable).
13 Pressure test shows air permeability ≤ 50% of leakage value of current national standards. If national standards are not available, 2m³/h/m²@ 50Pa is the maximum value for air permeability to achieve this criterion.
14 Pressure test shows air permeability ≤ 75% of leakage value of current national standards. If national standards are not available, 1.5m³/h/m²@ 50Pa is the maximum value for air permeability to achieve this criterion.
15 The average g-value of the glazing is ≥ 60%.
Space heat generator efficiency
16

The seasonal efficiency of the source of space heating is ≥ 90%. The system must also comply with ALL of the following:

  1. The heating system is to be designed in accordance with the recommendations of ASHRAE Standard 90.1.
  2. At least 75% of the heat demand must be sourced by the heating system with the highest efficiency; the remaining top-up heat must be supplied by a high efficiency heating source ≥ 90%.
  3. Where the heating system is comprised of an arrangement of multiple boilers or heat sources, the seasonal efficiency of the multiple boiler system must be ≥ 90%.
  4. The overall system efficiency, i.e. the distribution and seasonal boiler efficiency, is ≥ 70%
  5. The heating system controls must comply with ASHRAE Standard 90.1.
  6. A form of variable flow control is fitted, i.e. variable speed pumps.

 

Where CHP is specified, the criteria can be awarded provided that:

  1. The CHP operates as the main boiler.
  2. Remaining output is provided by boilers with an efficiency of ≥ 85%.
  3. Boost output is provided by high efficiency boilers ≥ 80%.
  4. The CHP plant must have an efficiency of ≥ 85%.
  5. The system controls comply with the requirements outlined in ASHRAE Standard 90.1.

OR

Where heat pumps are specified for heating, the criteria can be awarded provided that the COP is ≥ 4.5.

 

Note:

  1. To determine the seasonal efficiency of the boiler used for space heating the link below provides a list of boilers and their associated efficiencies. If the boiler used in the assessment is not on this list, the closest match can be used to demonstrate compliance: www.ncm-pcdb.org.uk/sap/.
  2. Where demand is partly met by on-site LZC or near-site LZC forms of heating (e.g. solar hot water), then that system’s output should be counted towards the overall system output for calculating system efficiency.
  3. Where the building is not heated this criterion is not applicable.
All buildings
Cooling and ventilation
17

Criteria 1-4 in Hea 04 Thermal comfort have been achieved.

AND

Air-conditioning systems specified have:

  1. A form of variable flow control fitted, i.e. variable speed drives.
  2. Controls to prevent simultaneous heating and cooling.
  3. Temperature and humidity (where applicable) set points selected for minimum energy consumption consistent with comfort conditions.
Residential
18

Where the design incorporates a system of providing low carbon cooling to completely displace the need for a mechanical cooling system.

OR

The cooling generator has a coefficient of performance (COP) of > 3.5.

 

Note: Compliance with this criterion will be shown if the design has used a low carbon cooling technology, such as, but not exclusively limited to:

  1. Night-time cooling, i.e. requires fabric to have a high thermal mass
  2. Ground coupled air cooling
  3. Displacement ventilation (not linked to any active cooling system)
  4. Ground water cooling
  5. Surface water cooling
  6. Evaporative cooling, direct or indirect
  7. Passive house (Passivhaus) cooling strategies
  8. Desiccant dehumidification and evaporative cooling, using waste heat
  9. Absorption cooling, using waste heat
  10. The building does not require any form of cooling

 

The assessment of this criterion excludes specialist cooling systems (such as server rooms, cold food storage etc.). The assessor should confirm with BRE which specialist cooling systems may be excluded from the assessment of this criterion.

All buildings
19

All ductwork and air handling units (AHUs) are certified to meet the best leakage standards.

OR

No mechanical ventilation (apart from where required as part of national building regulations; such systems should also comply with the leakage standards below).

 

Note: Examples of best practice standards are ductwork tested to EN 16798-3 class ATC 4 and AHUs tested to EN 1886 class L1 or ASHRAE Standard 62.1 Ventilation for acceptable indoor air quality and ASHRAE Standard 90.1 Energy standard for buildings.

Non-residential

20

Where the specific fan power for the mechanical ventilation system specified is:

  1. ≤ 0.5 W/litre/second for continuous extract ventilation systems.
  2. ≤ 1.0 W/litre/second for whole house MVHR when running at each of its settings AND achieves a heat recovery efficiency of at least 85%.

OR

No mechanical ventilation (systems required as part of national building regulations are excluded from the requirements).

 

Note: Where the mechanical ventilation systems specified for the residential building are complex and more akin to the systems specified in item 21, then the criteria listed for item 21 should be applied to the assessment instead.

 Residential

21

Where the specific fan power for the mechanical ventilation system specified is:

  1. ≤ 1.4 W/litre/second for central mechanical ventilation systems including heating only
  2. ≤ 1.8 W/litre/second for central mechanical ventilation systems including heating and cooling

AND

The system:

  1. Has a form of variable flow control fitted, i.e. variable speed drives.
  2. Can be controlled in accordance with the recommendations of ASHRAE Standard 90.1.

OR

No mechanical ventilation (systems required as part of national building regulations are excluded from the requirements).

 

Note: Where the mechanical ventilation systems specified for the non-residential building are simple and more akin to the systems specified in item 20, then the criteria listed for item 20 should be applied to the assessment instead.

 Non-residential
22

Where a method of heat recovery is integrated into the design of the mechanical ventilation system it must:

  1. Achieve a heat recovery efficiency of at least 75%.
  2. Have a form of variable flow control fitted, i.e. variable speed drives.
  3. Be controlled in accordance with the recommendations of ASHRAE Standard 90.1.

 

Note: Where the building is naturally ventilated this criterion is not applicable.