u	equilibrium moisture content (kg/kg)
mi	mass of the specimen in equilibrium (kg)
m 0	mass of the specimen when it is completely dry (kg)
D	thermal diffusion coefficient (m2/s)
w	Moisture content by weight (kg/kg)
Cp,m	mass specific heat capacity (J/kg·k)
qtest	heat flux (W/m2)
hi	convective heat transfer coefficient of internal surface (W/m2·K)
Ti	indoor temperature (K)
Tsurfi	the temperature on the internal surface (K)
gtest	moisture flux (kg/m2)
Psat,i	the indoor partial pressure of saturated vapor (Pa)
Psat,surfi	the partial pressure of saturated vapor on the internal surface (Pa)
Greek symbols
λ	thermal conductivity (W/m·K)
ρm	the density of building materials (kg/m3)
φ	relative humidity (%)
φi	indoor relative humidity (%)
βi	moisture exchange transfer coefficient of internal surface (s/m)
φsurfi	relative humidity of internal surface (%)