Buildings in Reunion Island have different thermal performances so the thermal energy storage should be enhanced. Using phase change materials in the building envelope could be a solution. These materials are able to increase the low thermal mass of lightweight constructions in order to improve human comfort, maintaining the building ambient thermal comfort closer to the desired temperature. The main objective of this paper is to present the thermal impact of PCM on two walls of an office with Reunion Island specific conditions. To this end, the experimental validation of a model based on the apparent heat capacity method and integrated into a building simulation code is used. The study results are very encouraging.

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