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Frome Supermarket - Part L2 Compliance |
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Flow Analysis Ltd were commissioned to perform a CO2 emissions Part L2 compliance calculation for an extension to a supermarket in Frome, Somerset. The extension is sufficiently large that compliance via L2A rather than L2B is necessary. A thermal model of the whole building was created in DCLG approved software (not SBEM). Since the calculation was performed by a CIBSE 'Low Carbon Consultant', Building Control would have confidence that the compliance procedure is performed by a competent person. The model of the building is created from architect's drawings and details of the proposed building fabric. The internal conditions are assigned from the NCM database as required for a Part L2 simulation. |
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A notional building is automatically created by the
software which conforms to 2002 Part L2 standards in terms of building fabric
and percentage of glazing. The target CO2 emissions for the actual building is
then determined by applying a factor to the CO2 emissions from the notional
building (see graph to the left).
It can be difficult to achieve the target, especially when constraints are placed on the external envelope as in this case. The critical factors in achieving compliance for this building were to use improved efficiency lighting and to utilise the waste heat from the refrigeration packs to heat the domestic hot water and reduce the space heating demand. As can be seen from the graphs on the right, with these measures in place, the space heating and hot water heating requirements are reduced to almost zero. |
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