Hello
I am using WUFI-Pro 5.1 in my project to monitor hygrothermal behavior of roofs. I would like to verify WUFI results for a steady state condition for a simple assembly (e.g a layer of mineral wool) with analytically calculated results by hand.
I am wondering if you have done such a thing before.
Tnx
Steady-state calculation by WUFI
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Manfred Kehrer
- WUFI International Support Team
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.... It is easy and complex.
Re: Steady-state calculation by WUFI
Yes, these things have been done before 
For constant material data (i.e. no temperature or moisture dependence), a steady-state temperature and/or vapor pressure profile is simply a poly-line consisting of straight line segments. The slopes of the lines are determined by the applied temperature or vapor pressure differences and the resistances within the materials. Dew-point methods or Glaser-type methods explain how to compute these profiles.
In order to test WUFI's steady-state temperature profile, set the vapor pressure constant across the component and switch moisture transport off.
In order to test WUFI's steady-state vapor pressure profile, set the temperature constant across the component and switch both heat transport and capillary transport off. (Only diffusion transport must be left. Differences in vapor pressure will lead to differences in relative humidity which in turn would drive additional capillary transport, if allowed, which would complicate things).
Regards,
Thomas
For constant material data (i.e. no temperature or moisture dependence), a steady-state temperature and/or vapor pressure profile is simply a poly-line consisting of straight line segments. The slopes of the lines are determined by the applied temperature or vapor pressure differences and the resistances within the materials. Dew-point methods or Glaser-type methods explain how to compute these profiles.
In order to test WUFI's steady-state temperature profile, set the vapor pressure constant across the component and switch moisture transport off.
In order to test WUFI's steady-state vapor pressure profile, set the temperature constant across the component and switch both heat transport and capillary transport off. (Only diffusion transport must be left. Differences in vapor pressure will lead to differences in relative humidity which in turn would drive additional capillary transport, if allowed, which would complicate things).
Regards,
Thomas