Transient one-dimensional heat and humidity simulation (hygrothermal simulation calculation) with WUFI Pro and transient two-dimensional heat and humidity simulation with WuFI 2D:
Hydrothermal simulation according to DIN EN 15026:2007-0 resp. WTA data sheet 6-2:014-12 is preferable to the stationary period accounting procedure (blowing process) because it enables a realistic illustration of the behaviour of components in the course of a year. The calculation is based on the latest findings on vapor diffusion and liquid transport.
In addition to heat transport through transmission and moisture transport through diffusion the hydrothermal simulation takes account of the capillary moisture transport in the component, the sorptive absorption capacity for precipitating moisture as well as rain and solar radiation based on locacation-dependent climate data (hygrothermal reference years HRY).
With the simulation calculation the technical proof of moisture can often be verifiably provided for not varifiable constructions according to DIN 4108-3:2018-10 resp. DIN 68800-2:2012-02 for components that cannot be verified by the blowing process.
The flow of the calculations of instationary warmth an moisture behaviour of components in buildings is described below: