Modélisation Tridimensionnelle Du Comportement Hygrothermique Dans Les Parois Multicouches De Bâtiments
Résumé: In this thesis, a numerical model was developed to simulate the coupled heat, air and moisture transport in unsaturated porous materials. The state of the art knowledge of heat and mass transfer in unsaturated porous media was applied. The major features of this model include multidimensional transient coupling hygrothermal transport and air convection integrated in hygrothermal simulation through Darcy-Boussinesq approximation. Based on energy and mass conservation equations, nonlinear partial differential equations are developed. Measurable physical properties involved in present modeling are dependent on the temperature and the capillary pressure which are considered as driving potentials. A commercial finite element solver was chosen to solve the governing partial differential equations of hygrothermal transport. A set of benchmarks was presented in this work to fit the model's ability to predict the hygrothermal behavior of unsaturated porous materials. The other key aspect of this work is the three-dimensional simulation of heat and moisture transport in the multilayered building envelope. The purpose being to limit energy loss and prevent the building envelope from moisture-related damages.
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