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Systèmes d’isolation thermique par l’extérieur : études expérimentales et numériques des transferts de chaleur et d’humidité.

Abstract : External thermal insulation (ETI) is an interesting technical solution for improving the energy performance of the building sector. However, ETI may change the hygrothermal balance of the envelope and affect its durability, especially with regard to moisture. With this in mind, a first work consisted in studying the hygrothermal behavior of three systems of ETI set on a hollow concrete block wall in the laboratory: an ETICS system (wet process) and two systems under cladding (dry process), with one of them composed with bio-based materials (wood wool and cellulose wadding). Experiments in a bi-climatic enclosure, combined with numerical simulations of coupled heat and mass transfers, made it possible to apprehend the hygrothermal behavior of these renovated walls at different stages: during the installation of ETI solutions, in "normal" use and under conditions leading to risks of condensation. The results of the ETICS system show the important role of the glue and the difficulty to understand numerically its behavior. The results of the cladding systems underline the interest of using bio-based materials under hazardous conditions, but also the sensitivity of numerical simulations to the hydric properties of hygroscopic materials. A second study on the in situ analysis of a cladding ETI system highlighted the absence of major risks related to humidity during the two years studied. In addition, the simulation / experiment comparison highlighted the important role played by the ventilated air.
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Submitted on : Wednesday, January 9, 2019 - 11:24:07 AM
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Mathieu Bendouma. Systèmes d’isolation thermique par l’extérieur : études expérimentales et numériques des transferts de chaleur et d’humidité.. Thermique [physics.class-ph]. Université de Bretagne Sud, 2018. Français. ⟨NNT : 2018LORIS485⟩. ⟨tel-01975115⟩

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