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» Category: EPC Conventions for England & Wales Issue 4  (Go back)

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2.02 Use of defaults
The energy assessor shall only use the default values within the Software Tool in the absence of any conventions identified within this document or more specific information on the building. Where a ...
2.03 Air permeability
The SBEM default value of 25 m3/hr m-2 for all existing buildings shall be amended as follows: Less than 10 m3/hr m-2 – only with an accredited air pressure test result 10 m3/hr m-2 – buildings >...
2.04 SBEM Weather Locations
For EPCs in England & Wales select the weather location closest to the subject address using the Excel lookup file – based on the Postcode Area (the initial 1 or 2 letters in the first part of the...
2.05 Planning Use Class
The Energy Assessor is not responsible for establishing the official authorised Planning Use Class of a particular building. However, if Assessors are provided with the authorised Planning Use Class f...
3.01 Light pipes
Light pipes (previously referred to as sun pipes) and similar devices to be ignored.
3.02 Adjacency assumed - party walls
Unless evidence to the contrary is readily and easily available, all buildings adjoining that building or part building which is being assessed, are assumed to be conditioned unless they are of Planni...
3.03 Frame factor
The ‘Frame Factor’ within SBEM is set at 10% by default. The assessor should amend this figure where appropriate.
3.04 Car parks
The following should be used in SBEM v3.5 to define an enclosed or underground car park which has mechanical ventilation and therefore requires either its own EPC or inclusion in an EPC. The activity...
3.07 Appropriate Use of U and Km values
The following must be observed whenever an assessor is introducing their own U and Km values for building elements rather than selecting pre-defined values from the SBEM database 1. The use of asse...
3.08 Strongly ventilated spaces
Where ventilation specifications are available, strongly ventilated spaces shall be defined as such in accordance with the table below: Exterior: For an envelope separating the considered zone from...
3.09 Transparent curtain walling
The description of ‘curtain walling’ in the SBEM database refers to solid or opaque wall construction only and therefore the U and Km values applied to this construction type do not include areas of g...
4.01 Light wells
Light wells to be treated as external envelopes.
4.02 Atria
All atria to be treated as Level 5 NDEPC assessment feature. Refer to accompanying Level 3, Level 4 and Level 5 decision flowchart and notes (Issue 1 – 15 March 2010).
4.03 Dimensions
Horizontal and vertical (inc. zone height) measurements to be carried out in accordance with diagrams and notes in ‘CEPC Dimension Conventions’ documentation.
4.04 Measurement accuracy (for distance, area and volume)
Calculated values entered into the software for the purpose of an EPC calculation must be provided with supporting calculations presented for audit. The minimum level of accuracy for calculated value...
4.05 Roofs with multiple components
Where the external roof of a zone or an individual component has a horizontal internal ceiling, the roof shall be entered as having a horizontal orientation and the area of the roof shall be the total...
5.01 Electric power factor
Electric power factor within SBEM must be left at the default value of <0.9 unless you have provided a photograph of the power factor correction device and/or other compelling evidence to amend thi...
6.01 Variable speed pumps other than central heating
Ignored unless using approved DSM software which allows for this input option.
6.02 Passive stack ventilation
Treat as per natural ventilation
6.03 Electric room heaters
Any form of fanned or unfanned electric ‘room heater’ whether panel, bar, convector or storage heater shall have a user amended efficiency of 1 (i.e. 100%).
6.04 LTHW boiler efficiencies
The following hierarchy should be followed to establish suitable values for the ‘Effective Heat Generating Seasonal Efficiency’ for all boilers. 1. Use ECA product list part load values at 30% and 10...
6.05 Electric HWS with and without storage
Where an electric system has no storage then it should be entered as an ‘instantaneous system’ with grid supplied electricity as its fuel and a seasonal efficiency of 1 (i.e. 100%). Where an electric...
6.06 HWS efficiencies and storage losses
The presence of storage/losses MUST be entered for all storage systems and this should be done where possible by entering the losses (in MJ/month) in preference to the volume and insulation type and t...
6.07 Estimating Local Mechanical Exhaust rates in buildings
Where it is not possible to obtain details of the fan performance from the Fan nameplate or Building Logbook, Operation & Maintenance manual etc. during the Site Survey, an approximation of the of...
6.08 Estimating the Specific Fan Power (SFP) in existing buildings
Where the fan power motor can be established from the fan nameplate or Building Logbook, Operation & Maintenance manual etc. during the site survey the established power will be used to calculate ...
6.09 Reversible Extract Fans
Reversible extract fans are treated in the same way as non-reversible extract fans in SBEM. It is not acceptable to use an arbitrary value or software default for the extraction rate where the actual ...
6.10 Hot Water Storage Vessels
Hot Water Storage Vessels Where you have a number of hot water storage vessels that have exactly the same fuel type and efficiency of operation, these can be entered into SBEM as one system incorpora...
7.01 Lighting options in SBEM
If a building’s original lighting design is available, and there is no discrepancy between that and the observed lighting within the building, the wattage and lux values, from that design, should be e...
7.02 Use of lux level meters
Lux level readings, taken by an assessor, may only be used for the production of an EPC if the readings have been recorded in line with the Society of Light & Lighting’s Code for Lighting 2009. Ev...
7.03 Mixed lighting in a zone in SBEM
Where a zone contains both general lighting and display lighting, and for the selected activity SBEM assumes the presence of display lamps, then the display lighting and the general lighting must be e...
7.04 Display lighting
Where zones incorporate an activity whereby SBEM automatically assumes the presence of display lighting but none is actually present, the display lighting efficiency for SBEM shall be entered such tha...
7.05 Missing Lamp Selection
Where a lamp type is to be selected for a zone but no lamp is currently fitted the assessor should select the least efficient lamp type that can be housed in the installed light fitting. If no light f...
Glossary of Terms
Air Permeability Air permeability is expressed as volume flow per hour (m3 h) of air supplied to the space per square metre (m2) of envelope area for an internal to external pressure difference of 50...
Local Mechanical Exhaust and Ventilation Rates
Assembly Rooms 10 Bakeries 30 Banks/Building Societies 6 Bathroom (non domestic) without Shower 8 Bathroom (non domestic) with Shower 20 Bathroom (domestic) 10 Bedrooms 4 Boiler Rooms 30 Cafés...
 

 

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