Nomenclature Symbols:

As part of a project on moisture transfer in walls with porous cladding that have been wetted by rain water and subsequently exposed to solar radiation, this article aims to discuss the movement of air within the cavity between the cladding and backwall. The effect of wind pressure notwithstanding, convective movement of air in the cavity is the result of the increased temperature of the cladding due to solar radiation. The main component of the project is the development of a control volume model that calculates air movement driven by the pressure gradient between the top and bottom of the cavity, as well as heat transfer by conduction, convection and radiation. Ongoing and future advances of the model are discussed, including the development of a profile of vapor pressures throughout the wall assembly. The model is validated by comparison of its results with the results of analytical models taken from literature. Finally, the experimental setup to be used to further confirm the previous findings is presented