Hi
The textured coated brick material properties seem inconsistent.
The moisture storage function gives a water content of 89 kg/m3
The liquid transport coefficient give 320 kg/m3
I had thought these two numbers represent free water saturation and so should be the same?
When clicking 'generate' on the LTC, the number to enter into the free water saturation isn't obvious.
Thank you
Textured coated brick
Re: Textured coated brick
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 material is exposed to water and allowed to take up as much as it can. Little air bubbles will remain caught in the pore spaces, so that the pore volume is not completely filled.
The highest water content tabulated for the liquid transport coefficients is the maximum water content wmax. This water content is reached when all pores are completely filled, it corresponds therefore to the porosity multiplied by the density of water, 1000 kg/m³. (In this case, the porosity allows wmax = 0.333 * 1000 kg/m³ = 333 kg/m³, whereas the liquid transport tabulations stop at 320 kg/m³. This is no problem because if needed WUFI extrapolates beyond the last table entry.)
Regards,
Thomas
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 material is exposed to water and allowed to take up as much as it can. Little air bubbles will remain caught in the pore spaces, so that the pore volume is not completely filled.
The highest water content tabulated for the liquid transport coefficients is the maximum water content wmax. This water content is reached when all pores are completely filled, it corresponds therefore to the porosity multiplied by the density of water, 1000 kg/m³. (In this case, the porosity allows wmax = 0.333 * 1000 kg/m³ = 333 kg/m³, whereas the liquid transport tabulations stop at 320 kg/m³. This is no problem because if needed WUFI extrapolates beyond the last table entry.)
Regards,
Thomas