According to the work of Motakef and EI-Masri

the wall was divided into dry-wet-dry zones. Based on the heat and moisture transfer through porous media

considering the vapour condensation as a vapour sink

water source and heat source

coupled heat and moisture equations for wet zone were established. Closed-form analytical expressions for the condensation rate

moisture content and the time when critical moisture content value reached are obtained. It is indicated that the condensation rate exhibits a strong dependence on the temperature difference of the two sides of wet zone

and the maximum condensation rate value is reached at the boundary of wet zone close to lower temperature.