The purpose of this paper is to study the energy efficiency of a local living\nspace exposed to solar radiation in the subtropical climate of Casablanca. The\nstudy was mainly focused on the contribution of a phase change material\n(PCM), inserted into a 7-cm thick air layer of a double brick wall, in two different\nlocations. We note that the experimental study was conducted using\ntwo real-scale test cavities, located in the Faculty of Science Ain\nChock-Casablanca. Two PCM mounting methods were used for the south\nand west walls, in order to test its energy efficiency as a storage and retrieval\nmeans of the solar flux coming from the outside. In the case of the southern\nwall, the PCM is put directly on the internal side of the outside part of the\ndouble wall (Case 1). For the west wall, the PCM is placed 1.2 cm away from\nthe internal side of the outer part of the double wall (Case 2). The first result\nshows that the PCM placed to the wall allows storing the solar heat during the\nday and releasing it to the outside of the building at night. While in the\nsecond case, the PCM keeps the heat stored day and night.
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