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Knowledgebase : EPC (ND) Conventions (E&W) Iss.5
Where part of a building (Refinement) is being assessed for New Build Compliance or EPC purposes AND the building has:- (a) Photovoltaic (PV) panels affixed to the building; and (b) One electricity meter serves the whole building; and (c) The PV is ...
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 default value is selected the assessor must provide evid...
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 > 500 m2 built to 2002 Building Regulations (or later) ...
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 postcode). For EPCs in Northern Ireland the software shoul...
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 from a suitable source, then this should be entered as t...
Documentary evidence provided by the client's design team upon which the Energy assessor is relying to produce an EPC shall be the 'As Built' documentation only. Suitable evidence will include, but not be confined to:- * Drawings which clearly indic...
Potential Types of Acceptable Documentary Evidence (not exhaustive) * Building Control sign-off sheets * Technical design information * Manufacturer's technical data sheets * Calculations from an accredited individual * Installation record / S...
Light pipes (previously referred to as sun pipes) and similar devices to be ignored. The modelling of light pipes using SBEM will only be considered where the pipes do not pass through a complete building storey in order to serve the storey below; in th...
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 Planning Class B2 to B8 in which case they are assumed to be ...
The 'Frame Factor' within SBEM is set at 10% by default. The assessor should amend this figure where appropriate.
Removed from Issue 5; 1st September 2014
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 * The use of assessor defined values by Level 3 qualified assessors is o...
Option Brief Description Exterior For an envelope separating the considered zone from the outside air or water Strongly Ventilated Spaces For an envelope separating the considered zone from a space provided with one or more permanent ...
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 glazing or translucent materials within the wall space. ...
For activities such as veterinary or similar building where space for housing animals is conditioned on a 24 hour basis 7 days a week, assessors should use the "C2A Secure Residential Institutions" as the building type and select the "Cell (police/prison)...
Where secondary glazing is present in existing buildings, select from the Project database Library the following option:- Acoustic double glazing with 200mm interpane gap. The frame type shall be the framing material used for the outer pane only.
Where any window has frames made of multiple frame types, e.g. timber outer frame and metal intermediate frames, the assessor shall select the frame type for the material that is in direct contact with the structural opening.
Light wells to be treated as external envelopes
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).
Horizontal and vertical (inc. zone height) measurements to be carried out in accordance with diagrams and notes in 'CEPC Dimension Conventions' documentation.
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 values entered into the software for the purpose of an EPC ...
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 horizontal internal surface area exposed to the condit...
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 this figure. Where only a photograph of the power factor co...
Ignored unless using approved DSM software which allows for this input option.
Treat as per natural ventilation
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%).
The following hierarchy should be followed to establish suitable values for the 'Effective Heat Generating Seasonal Efficiency' for all boilers. * Use ECA product list part load values at 30% and 100%* - these should be used to calculate the seasonal ...
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 SYSTEM has SOME/ANY STORAGE then ‘ELECTRIC INSTANTANE...
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 thickness. The source information (such as manufacturer'...
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 the air flow rate in I s-1 m-2 (often written as I/s/m2 in...
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 the SFP. If the power rating of a fan is known in horsepo...
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 value is unknown. Refer to 'Estimating Local Mechanical...
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 incorporating the sum total of the storage losses of the indivi...
This convention provides the procedure to be followed in the circumstances where an energy assessor comes across zones that are without any form of fixed buildings services. The flow chart in appendix 10.07 provides the approach an energy assessor shoul...
All kitchen area extraction devices are to be included as part of the SBEM assessment process, in order to account for the additional energy requirements for the conditioning of higher air change rates. I.e. extractor hoods are no longer to be disregarded...
Where a zone is without any form of fixed conditioning appliance(s) [ and there is evidence that there would not be any direct conditioning], but at least 50% of the surrounding envelope area, including walls, floors, ceiling/roof is adjacent to directly ...
There are three scenarios that should be dealt with when assessing a locally and centrally conditioned individual shop in a shopping centre: 1. The unit has local heating or Air Conditioning and receives unconditioned central fresh air from the plant ro...
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 entered using the 'Full lighting design carried out' opt...
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. Evidence of achieving a complete blackout of windows and the ...
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 entered as 'display' and 'general' lighting respectively...
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 that it is the same as that of the general lighting presen...
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 fittings are observed or the acceptable lamp type(s) can...
Where lamps are specifically identified via technical information and/or visual inspection as 'T5' lamps in a 2D configuration, and appropriate evidence is provided for this by the energy assessor they should be entered into SBEM as T5 lamps. In all other...
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 Pa i.e. 25 m3 hr-1 m-2 at 50Pa. ATRIUM In this co...