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The primary advantage of the more detailed and thus more advanced method (holistic approach) is the higher quality and reliability of the results, due to the very realistic model on which the calculation is based. The intermediate results are quite exact and very appropriate for further more detailed analysis. Its main disadvantages are the need for suitable computer software for the complex calculation and the longer time required to perform the calculation.
EN ISO 13790 describes calculation methods for the energy need for heating and cooling for each building zone, whereas EN 15603 deals with the overall energy use and the energy performance of buildings, collating the results from other standards, including those from EN ISO 13790.
More information: CENSE Information Paper P095 which can also be downloaded from the BUILD UP Portal.
Question submitted by: Dick van Dijk (TNO, The Netherlands)
Anwered by: Anna Staudt and Hans Erhorn, Fraunhofer Institute of Building Physics (Germany)
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