A 2D model for coupled heat, air, and moisture transfer through porous media in contact with air channels

•A new heat–air–moisture model applied to porous media and air channels is developed.•Good agreement with numerical benchmarks from literature is obtained.•Simulations based on a 2D wall assembly show strong couplings between transfers. Detailed modelling of air leakage paths through complex building wall assemblies is a challenging task. It requires transient modelling of diffusion and advection phenomena through fluid and solid domains, including porous materials and air channels. In this article, the development of a numerical model coupling heat air and moisture transfers (commonly called HAM transfers) is presented. The model is able to deal with non-isothermal air flow through complex 2D (two-dimensional) geometries, combining air channels and porous media, air permeable or not. A stepwise 1D validation of the model is achieved with numerical benchmarks. The model is then tested on a 2D air leakage configuration subjected to infiltration and exfiltration scenarii.