The design of passive cooling systems is part of the energy-efficient building since population growth and indoor requirements in various dwellings are paramount. As a part of passive designs, modifying the conventional roof with phase change materials (PCM) is one of the techniques to control the abnormal changes of the inner surface temperature of the roof. In this aspect, a numerical investigation has been carried out by incorporating the PCM encapsulated pipes in the RCC (reinforced concrete), and a comprehensive analysis has been carried out. Three different shapes are chosen, namely circular, oval, and rectangular oval, to encapsulate the PCM. Diurnal outside changes are considered to envisage the inner surface temperature of the roof. Validation of the literature's experimental results is done before developing a numerical model for the current study. The effect of encapsulated shape on PCM's average temperature, liquid fraction and energy storage has been studied. The inner surface temperature is reduced drastically with the roof consisting of elliptical encapsulated PCM than other designs such as circular and rectangular oval encapsulated PCM. Moreover, the performance of PCM is sensitive to encapsulated shape and location within the system.
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