Paper Conference

Proceedings of Building Simulation 2021: 17th Conference of IBPSA


Improving the Reliability of theoretical approaches for hygrothermal characterization and modeling of building envelopes

Imane Oubrahim 1,2,3, Thierry Duforestel 1,3, Rafik Belarbi 2,3
1 EDF R&D, TREE EDF Lab Les Renardières, 77818 Moret-sur-Loing, France
2 LaSIE UMR 7356, CNRS, La Rochelle Université, Avenue Michel Crépeau, 17042 La Ro- chelle Cedex 1, France
3 4ev Lab CNRS, Université de La Rochelle, Electricité de France EDF, Avenue Michel Cré- peau, 17042 La Rochelle Cedex 1, France

Abstract: We notice a significant disagreement between simulated results and the one measured, chiefly in dynamic configurations, when it comes to hygrothermal modeling. The analysis of these results led us to two essential weaknesses in the current methods: an underestimation of the water vapor permeability of materials (linked to an experimental bias), and a non-consideration of the hysteretic nature of moisture sorption in hygrothermal models (Duforestel (2015)). Therefore, a national project SmartReno (2019) aims to complement our theoretical and experimental background to create reliable tools for hygrothermal simulation. Accordingly, this paper will present the different problematics to which we expect to respond and the methodology we will use. Then, we will put forward the first results of the work concerning the objectives of this project.
Keywords: Sorption Hysteresis, modeling, renovation, water vapor diffusion coefficient, gas relative permeability
Pages: 1187 - 1194