Abstract
This article examines whether transient two-dimensional simulations are sufficient or three-dimensional simulations are necessary for the hygrothermal analysis of the three-dimensional detail of a beam support. Detailed measurement series from a test house with various interior insulation systems available for the investigation allow the results of two- and three-dimensional simulations to be verified with the measured data. In both the cases, a very good agreement between measurement and simulations was found. With the thermal simulations, agreement with the measured data is similar in both two- and three-dimensional calculations. However, the hygric measurements agreed slightly better with the three-dimensional calculations. For planning real tasks, two-dimensional simulations should be sufficient, provided that the simulation settings are selected within the secure margins. The actual comparison is initiated by the validation of the software DELPHIN 6 by means of a three-dimensional, stationary test case from EN 10211.
Highlights
Three-dimensional, thermal building component simulations have been established decades ago [1,2,3] and are generally used only for special applications due to greater efforts involved
Many users are often faced with the choice of whether such 3D simulations are necessary at all
A benchmark test was newly developed for the validation of 3D anisotropic transport models (“ATBEB”, [8]): a partially sealed wooden beam is exposed to moisture changes in a climate chamber and in the simulation under isothermal conditions
Summary
Three-dimensional, thermal building component simulations have been established decades ago [1,2,3] and are generally used only for special applications due to greater efforts involved Some of these software programs, specialised in the construction sector, have the option of considering vapour transport [4]. Coupled 3D building component simulations that take vapour, capillary and air transport into account under dynamic climatic conditions have been started only in recent years [5, 6]. Such simulations require a comparatively high expenditure of time for input, calculation and evaluation.
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