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The impact of indoor climate on the hygrothermal behaviour and the durability of external components - standard boundary conditions vs. hygrothermal indoor climate simulation

: Holm, A.; Künzel, H.M.; Sedlbauer, K.

Türkeri, A.N.; Sengül, Özkan:
11th International Conference on Durability of Building Materials and Components, DBMC 2008. Proceedings : Istanbul, Turkey 11-14 May 2008
Istanbul: Istanbul Technical University, 2008
ISBN: 978-975-561-328-4
International Conference on Durability of Building Materials and Components (DBMC) <11, 2008, Istanbul>
Fraunhofer IBP ()
hygrothermal simulation; WUFI; WUFI+; EN 13788; EN 15026

In civil engineering there is an increasing demand for calculation methods to assess the moisture behaviour of building components. Intensive work has been done over the past few years on the development of mathematical approaches and procedures to evaluate real thermal and moisture transfer processes. The boundary conditions have, beside the correct material properties, a very significant influence on the simulated hygrothermal performance.
In this paper the moisture behaviour of the different construction assemblies of a house are simulated with a well validated one dimensional model using the internal boundary conditions according to the European standard EN 13788 and EN 15026. But it is well known, that the hygrothermal behavior of the building envelope affects the overall performance of a building as well. Therefore in this paper such a combined model, that takes into account moisture sources and sinks inside a room, input from the envelope due to capillary action, diffusion and vapor ab- and desorption as a response to the exterior and interior climate conditions as well as the well-known thermal parameters will be applied. In influence of different scenarios (usage of the building, loads, ventilation strategies,...) will be compared to the simplified approaches described in the standards.