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Why are different methods offered for the calculation of energy needs in EN ISO 13790?

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Each method has its own applications: the seasonal method is the simplest, but it is applicable only in climates where seasons are clearly defined, the monthly method is easy to use in buildings without or with small intermittence effects, while the simple hourly method is of more general use, but requires hourly meteorological and use data and, despite the fact that it produces hourly results, it is based on a simplified model with only the monthly results validated. Concerning the pro's and con's of a detailed simulation method, see chapter 8 of CENSE Information Paper P92 which can also be downloaded from the BUILD UP Portal. The choice is strongly related to the (national) application and may depend on the type and complexity of the building.

Question submitted by: Dick van Dijk (TNO, The Netherlands)
Anwered by: Dick van Dijk (TNO, The Netherlands)
Date: 29/04/2009