Abstract
Abstract Currently, the introduction of phase change materials (PCM) in building materials is recognized as a popular technique for reducing interior temperature fluctuations and improving the energy efficiency of buildings. Conventionally, PCM in construction materials is different with bulk PCM as it incorporates impurities and acts as a binary mixture. For this reason, physical models to describe heat transfers inside such materials are highly requested. This paper presents four physical approaches that can be applied to examine heat transfer in impure PCM dispersed inside a building material. These models have been successfully verified and tested using experimental results from the literature. A significant hysteresis is observed during the phase transition as a result of thermal gradients within the composite material as well as the non-symmetric enthalpy profile as a function of temperature.
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