Theory for the Building Materials version of the Heat and Moisture Transport Interface
The Building Materials version of the Heat and Moisture multiphysics coupling implements the following equations for heat and moisture transport, derived from Ref. 15:
(4-125)
(4-126)
where:
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(ρCp)eff (SI unit: J/(m3·K)) is the effective volumetric heat capacity at constant pressure.
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T (SI unit: K) is the temperature.
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keff (SI unit: W/(m·K)) is the effective thermal conductivity.
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Lv (SI unit: J/kg) is the latent heat of evaporation.
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δp (SI unit: s) is the vapor permeability.
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(dimensionless) is the relative humidity.
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psat (SI unit: Pa) is the vapor saturation pressure.
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Q (SI unit: W/m3) is the heat source.
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ξ (SI unit: kg/m3) is the moisture storage capacity.
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Dw (SI unit: m2/s) is the moisture diffusivity.
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G (SI unit: W/m3) is the moisture source.