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Influencing parameters on calculated heating and cooling energy demand in buildings in accordance to various methods of EN ISO 13790. For calculation of energy use for space heating and cooling three methods can be deployed: detailed simulation method, simplified hourly method and simplified monthly method. The different methods differ significantly in terms of level of detail and therefore also in the quality of their results. For the comparison of the results of different models a standard for validation was established, which evaluates the quality of the models based on differences of the annual sums of energy use for heating and cooling. Differences of hourly or monthly values do not influence the validation. This article shows, how mean value and standard deviation can be integrated into the validation method. Furthermore it describes the influence of the elements of the heat balance on the quality of the results.

Häufig wird die Frage nach der Vergleichbarkeit von Energieausweis‐Berechnungen nach unterschiedlichen nationalen Normen gestellt. Dieser Artikel beschäftigt sich mit der Bewertung eines komplexen Nichtwohngebäudes sowohl nach deutschen als auch nach österreichischen Berechnungsalgorithmen. Dabei werden einerseits Vorgangsweise und Aufwand und andererseits die Ergebnisse der unterschiedlichen Berechnungen miteinander verglichen. Die Ergebnisse zeigen, dass trotz erheblichen Mehraufwands der Großteil der Ergebniswerte der deutschen Berechnung nur geringfügig von jenen der österreichischen abweicht.Comparative calculation of an energy certificate according to German and Austrian algorithms. The question of the comparability of energy certificate calculations according to different national standards is a frequently asked one. This article deals with the assessment of a complex non‐residential building by both German and Austrian algorithms. Compared were approach and complexity on the one hand and the results of the different calculation methods on the other hand. The results show that despite considerable additional effort, most of the results of the German calculation differ only slightly from those of the Austrian calculation.

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