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With the implementation of the EU Energy Performance of Buildings Directive from January 1, 2019 on, the difference in national definitions of nZEB becomes evident. Due to different metrics, system boundaries and limits, it is hard to compare ambition levels of the new requirements of an nZEB in the different EU Member States. The assessment is even more complicated due to different national calculation methods and boundary conditions. In this paper a methodology is presented, which allows a relative comparison of ambition levels by the use of building simulation and a common reference building. The methodology is tested with different simulation programs in the countries Austria, Germany and Switzerland. Results confirm that the use of different standard simulation tools requires previous calibration of the reference building. Remaining limitations of the comparison for the case of different climate zones are addressed by defining a passive house in local climate as reference building with high ambition level, but this issue is also subject to further investigations.

Simulation-based Methodology For Comparison Of nZEB Requirements In Different Countries Including Results Of Model Calibration Tests