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Prescot Regeneration Scheme - Part L2 Compliance |
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Flow Analysis Ltd were commissioned to perform a CO2 emissions Part L2 compliance calculation for several units forming part of a proposed re-generation scheme in the north of England. The units are a mixture of offices, workshops and warehouses all of which are naturally ventilated. Naturally ventilated buildings are often particularly challenging to pass the Part L2 Regulations. A thermal model of four of the buildings was created in DCLG approved software (not SBEM). The calculation was performed by a CIBSE 'Low Carbon Consultant', so that Building Control would have confidence that the compliance procedure is performed by a competent person. The model of the buildings are 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).
As is often the case (particularly for naturally ventilated buildings), the emissions are dominated by lighting (shown in yellow on the graphs to the right). It is therefore crucial to reduce the lighting loads by utilising daylight sensor lighting. However, to assess the functionality of this type of lighting, an analysis of daylight factors for the buildings is required - and this has been performed for little additional cost. The emissions for domestic hot water heating is also significant for some of the units and so by increasing the efficiency, the overall emissions are reduced to levels comfortably below the target. |
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