IEA EBC Annex 71: Building energy performance assessment based on in-situ measurements
Despite regulation enforcements, monitoring of actual energy performances of buildings reveals in many cases a significant gap with theoretically designed targets. This accentuates the need to develop reliable methods that can be applied on site to assess the actual performance of buildings.

The main goal of IEA EBC Annex 71 research project is to (further) develop such methods from on on-site measured data of in-use buildings ( The adopted indicator to characterize the building envelope performance is its heat loss coefficient (see below). This measured indicator could be used for different purposes (see section 3 of this survey).

With this survey, we want to collect the interests and needs of the stakeholders with regard to the methods we develop.
More about the Building Heat Loss Coefficient
The building Heat Loss Coefficient is defined as "The rate of heat loss from the building envelope, expressed in Watt per Kelvin of temperature differencial between the internal and external environments". It includes the  heat losses through the external walls (1), towards the ground (2) and towards adjacent unheated spaces (3), as illustrated for the protected volume VP1.
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