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Theses

Evaluation de l'impact des isolants minces réfléchissants dans le bâtiment

Abstract : Insulation technique using thin reflecting insulation materials (TRP) join the thermal insulation performance of materials as well as air cavities with the reduction of radiative heat transfer using a barrier with low thermal emissivity. The use of these materials has spread enormously in the European markets without a valuable evaluation of their real thermal performance once integrated in the building envelop. The main objective was therefore to carry out a complete characterization of these products integrated in vertical walls and roof systems, by modeling and experimental study, to have a better knowledge of the physical phenomena induced by this type of insulation products. A heat transfer model for a vertical complex wall integrating a TRP adjacent to one or two non-ventilated air layers was realized. A preliminary numerical study characterized the natural convective heat transfer inside the non-ventilated air layers of different dimensions and inclinations. The results of thermal performances were validated by an experimental study based on the principle of the hot box. A heat transfer model of a complex roof system was developed. For summer conditions, the ventilated air layer built between the tiles and the TRP was studied numerically and through PIV measurements. The heat transmission ratio of the complex was determined by varying several parameters. For winter conditions, the thermal performances of the complex were calculated by taking into account the impact of the wind on the ventilated air layer and the permeability of the tiles. The results showed that these products, used as a unique insulation, cannot ensure a good level of insulation in conformity with European standards. Installed as a complement of insulation, they have the advantage of increasing the summer comfort in attics in sunny conditions.
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Submitted on : Tuesday, January 26, 2010 - 8:00:00 AM
Last modification on : Wednesday, October 14, 2020 - 4:02:33 AM
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  • HAL Id : pastel-00005757, version 1

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Nada Chami. Evaluation de l'impact des isolants minces réfléchissants dans le bâtiment. Sciences de l'ingénieur [physics]. École Nationale Supérieure des Mines de Paris, 2009. Français. ⟨NNT : 2009ENMP1652⟩. ⟨pastel-00005757⟩

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