Project White Knight (Part L2 (2002))

Demonstration of compliance with Building Regulations Part L2 using the CECM requires the use of recognised thermal modelling software. Flow Analysis Ltd can offer this service, one example of which is summarised below.

The basic idea of the CECM is to compare carbon emissions of the design building with that of a notional building. The latter is constructed of the same shape and design as the design building, but the U-values of the external envelope conform to Table 1 of approved document L2 and the percentage of glazing conforms to that laid down in Table 4 of approved document L2. Further, the building services of the nominal building are constrained within agreed guidelines.

Some views of the design building and the surrounding buildings (included due to the shading effects on the design building), as modelled by Flow Analysis, are shown above.

Even though the facade is about 70% glazing, the annual energy consumption of the design building is predicted to be less than the notional building. Therefore the building passes the CECM compliance test. The largest factor contributing to the energy efficiency is the heating with air to air heat recovery at 30% efficiency.

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