Hey!
I try to create a reveal with WUFI 2D and have some problems with glas.
I took the material "Glas" out of the Catalog "Materialien für thermische Berechnungen".
When I enter "Processing" I get a warning that some data for glas are out of range (porosity, etc.).
Anyway, the calculation works - but the results aren´t correct.
Do I have to consider something else in handling with glas?
Thanks for your help!
Crna
Create a window in WUFI 2D
-
Christian Bludau
- WUFI SupportTeam IBP
- Posts: 1134
- Joined: Tue Jul 04, 2006 10:08 pm -1100
- Location: IBP Holzkirchen, the home of WUFI
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Re: Create a window in WUFI 2D
Hello,
the meaning of "Materialien für thermische Berechnungen" is materials for thermal calculations. This materials do not include the properties needed for moisture calculations. So they are not really usable for hygrothermal questions. As there is not really a moisture transport in glass, you can use this values, but you have to adapt the values. For a window i would not enter eg. three layers of glass. I would model it with one layer and give this layer the properties of the whole window (effective lambda and really high µ-value). Usually you do not want to see what is happening inside the window in the gas.
Christian
the meaning of "Materialien für thermische Berechnungen" is materials for thermal calculations. This materials do not include the properties needed for moisture calculations. So they are not really usable for hygrothermal questions. As there is not really a moisture transport in glass, you can use this values, but you have to adapt the values. For a window i would not enter eg. three layers of glass. I would model it with one layer and give this layer the properties of the whole window (effective lambda and really high µ-value). Usually you do not want to see what is happening inside the window in the gas.
Christian
Re: Create a window in WUFI 2D
Ok, thank you.
Re: Create a window in WUFI 2D
Hey everyone!
I got another question concerning glas. My glas material has the following values:
Density: 2500
Porosity:0
Sp. Heat Cap., Dry:800
Therm. Conduct., Dry: 0,8
Water Vapour Diff.-Res.: 1000000
Built-In Moisture: 0
and the initial conditions: Temp: 20°C, Watercont.: 0, R.H.: 0
However, when I open the results with WUFIMotion the glas has a fluctuating and quite high Relative Humidity
(at the start of the animation the R.H. of glas is 1,0). I thought R.H. depends on the µ-value and (maybe) the porosity.
Is there another value which I have to keep in mind?
Thanks for helping! Crna
I got another question concerning glas. My glas material has the following values:
Density: 2500
Porosity:0
Sp. Heat Cap., Dry:800
Therm. Conduct., Dry: 0,8
Water Vapour Diff.-Res.: 1000000
Built-In Moisture: 0
and the initial conditions: Temp: 20°C, Watercont.: 0, R.H.: 0
However, when I open the results with WUFIMotion the glas has a fluctuating and quite high Relative Humidity
(at the start of the animation the R.H. of glas is 1,0). I thought R.H. depends on the µ-value and (maybe) the porosity.
Is there another value which I have to keep in mind?
Thanks for helping! Crna
-
Christian Bludau
- WUFI SupportTeam IBP
- Posts: 1134
- Joined: Tue Jul 04, 2006 10:08 pm -1100
- Location: IBP Holzkirchen, the home of WUFI
- Contact:
Re: Create a window in WUFI 2D
Hello Crna,
WUFI is always calculating with the temperature and relative humidity, even if the material is completely tight. If you do not enter a moisture storage function, WUFI is generating one depending on the porosity. RH of zero should not work, as well as porosity must not be zero. Please use a porosity like 0,00001 otherwise the moisture storage function can not be created.
Did your calculation finished with results, as using such values the calculation may not converge.
Christian
WUFI is always calculating with the temperature and relative humidity, even if the material is completely tight. If you do not enter a moisture storage function, WUFI is generating one depending on the porosity. RH of zero should not work, as well as porosity must not be zero. Please use a porosity like 0,00001 otherwise the moisture storage function can not be created.
Did your calculation finished with results, as using such values the calculation may not converge.
Christian