Transfert de chaleur à travers les isolants thermiques du bâtiment

Abstract : The objective of this study is to better understand the mechanisms of the coupling radiative-conductive heat transfer of thermal building insulators used in a transient regime. Two insulating materials were studied in this work: extruded polystyrene foam (XPS) and wood wool. The radiative properties were determined using the inverse method. We demonstrated that the contribution of the radiative heat transfer of the wood wool was quite small. For XPS, radiative properties are more significant and are a function of the foam morphological structure as well as the optical indices of the polymer matrix. A model was developed for isotropic XPS material, however additional developments are needed to better characterize the effects of the foam anisotropy. The coupling radiative-conductive heat transfer in a transient regime was analyzed and validated with the heat flux meter measurement. The experiments were performed with a single insulating element and with various combinations of them. For building thermal insulation in a transient regime, we demonstrated the heat fluxes at the borders of insulators, determined by the coupling solution, are identical when considering the total thermal conductivity which includes radiative and conductive heat transfer. The individual contribution of radiative and conductive heat transfer was not noticeable, however the thermal inertia of the material contributed to delay the heat peak.
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Aurélie Kaemmerlen. Transfert de chaleur à travers les isolants thermiques du bâtiment. Autre. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10102⟩. ⟨tel-01748330⟩

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