WUFI

Hi Mikaeltm,

the HygroApprox tool is meant to combine data from sorption measurements and mercury porosimetry, but it seems you have no porosimetry data.

What you could to is to fit a "three-point formula" to your data:

https://www.wufi-forum.com/viewtopic.php?t=1980

This formula doesn't ...

Und als .wac zurück.

Gruß,
Thomas

Hallo JoSchäfer,

wenn es um die aktuellen km²-genauen Testreferenzjahre des DWD geht, kein Problem.

Hängen Sie bitte die betreffende .dat-Datei als Attachment an ein Posting an (ggf. gezipt), dann konvertiere ich es für Sie.

Mit freundlichen Grüßen,
Thomas

Hi David,

the tiles in the drop-down list are supposed to be glazed and thus impermeable to vapour transfer. However, the mortar in the joints between the tiles is vapour-permeable, and the "2 m" suggested by the drop-down list refer to the vapour permeability of those joints, taking their ...

Dear Philipp,

as currently programmed, WUFI cannot take rain, short-wave radiation and long-wave radiation into account on the right-hand side of the component (which is usually the indoor side). So you don't need any special climate file. Just assign your normal climate file to the right-hand ...

However I did not understand the next "If in your case the heat flow can be expected to be predominantly upwards or downwards, you may choose the respective options. Otherwise, the next best option is probably to use a mean value.". Could you please put an example?


Hi Alberto,

in the case of ...

Hi Alberto,

the science behind those numbers is this: Air at rest has a thermal conductivity of about 0.025 W/(mK) and a vapor diffusion resistance factor of µ=1 (by definition). However, the air in an air gap of a building component is usually not completely at rest. Temperature differences across ...

Dear David,

WUFI does not directly output the ice content since this has not been of major interest so far. However, you can compute the ice content from WUFI's standard output.

For liquid water and frozen water to be in equilibrium, they must have the same vapour pressure. Usually, at ...

Hallo Philipp,

zu den ersten beiden Fragen:

1) Die beiden Angaben zum w-Wert des mineralischen Außenputzes sind identisch und nur in verschiedenen Einheiten angegeben. 0,00167 kgm2 s 0.5 (pro Wurzel sekunde !) sind gerade 1/60 (= 1/Wurzel(3600)) des w-Werts 0,1 kg/m2 h 0.5 (pro Wurzel stunde ...

Hi David,

the highest water content tabulated in the moisture storage function (the moisture content corresponding to relative humidity = 1, or 100 %) is the free saturation wf . This is the number to be used for generating the liquid transport coefficients. Free saturation results when the ...

does WUFI always uses this formula (1 + 0.01*temperature) to determine the ice content, regardless of the material properties?

Dear Jan,

WUFI uses this formula for all materials since it is independent of any material properties. It is based on the fact that in thermodynamic equilibrium the ...

Dear Jan,

WUFI takes into account that water contained in small capillaries does not freeze at 0°C but at some lower temperature which depends on the capillary radius. In a given grid element, water in large pores may be frozen while at the same time water in smaller pores is still liquid. WUFI ...

Hi Walter,

the driving rain coefficients determine how much rain will reach the surface. They include everything that happens before the water hits the surface.

For example, the "normal rain" is measured with respect to a horizontal receiving plane, the driving rain is measured with respect to a ...

Hi Benoît,

the details of the air infiltration source are as follows:

For each time step, WUFI determines the lowest temperature occurring in the region covered by the source.

If this temperature is higher than the dew point temperature of the indoor air, nothing happens. If it is lower ...

Hi Benoît,

I will check with the programmers about how the air infiltration source function has been implemented exactly, regarding the temperature evaluation and the moisture release within the source region.

Kind regards,
Thomas