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Measured or operational energy performance of buildings - Procedures for defining measured energy use and operational ratings and for presenting measured energy performance results on building energy certificates

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CEN standards EN 15603 and EN 15217 describe how to assess the overall operational energy use of a building, the calculation of measured energy ratings in terms of primary energy, CO2 emissions or weightings defined by national energy policy and how the results should be expressed on a building energy certificate.
Information Paper P89 of the European Project CENSE 

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