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Analyses expérimentales et numériques du comportement hygrothermique d’une paroi composée de matériaux fortement hygroscopiques

Abstract : More stringent thermal regulations, made necessary the inclusion of mass transfer in building walls and their interaction with heat transfer, particularly for those composed of porous and highly hygroscopic materials.The experimental device consists of two walls mounted and tested on PASSYS orientable cells, with controlled indoor environment, located on the CEA-INES site in Le Bourget du Lac. The wood framed walls, with a wood fiber insulation were tested under different internal and external conditions, depending respectively on internal monitored temperature and humidity, or orientation. The one-year long experimental measurements have shown the influence of moisture fluctuations on the thermal behavior of the tested walls, and also the influence of temperature on the moisture in the walls.A numerical model was used to simulate the phenomena observed in experimental conditions. The model, developed on DYMOLA was firstly validated by a comparison with other existing numerical models, during a benchmark on experimental measurements under controlled conditions. It was then used to simulate experimental sequences on external conditions of this work. Comparing the numerical and experimental results have shown a correlation of the temperature measurements, but a difference for the moisture measurements. Parametric adjustments showed an overestimation of the Hygric inertia combined with an underestimation of the vapor permeability of the numerical model compared to experimental sequences. A mismatch of material properties such as reflected generally in the numerical models with the experimental conditions in which they are recorded is underlined.
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Submitted on : Thursday, December 17, 2015 - 8:22:07 AM
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Yannick-Ariel Kedowide. Analyses expérimentales et numériques du comportement hygrothermique d’une paroi composée de matériaux fortement hygroscopiques. Génie civil. Université Grenoble Alpes, 2015. Français. ⟨NNT : 2015GREAA015⟩. ⟨tel-01245319⟩

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