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Can the calculation method for the overall transmission and ventilation heat loss coefficients be used for existing buildings?

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Yes, but some of the required input data may not be available at reasonable costs. For those cases default values may be provided at national level, e.g. as function of type and age of construction.

Question submitted by: Dick van Dijk (TNO, The Netherlands)
Anwered by: Dick van Dijk, TNO (The Netherlands) and Brian Anderson, BRE (UK)

Date: 2009/02/19