The main objective of this study is to investigate the enhancement of energy storage rate of a thermal energy storage unit filled with a PCM by inserting a fin array system. Heat is transferred to the unit through its base plates, to which aluminum fins are attached. The PCM, a commercial paraffin wax, is stored between the fins. A mathematical model, based on finite volume method, for a 2-Dimensional domain is developed for solving the melting problem. Transient simulation has been performed for different fin and PCM layer thicknesses, while the ratio of PCM layer to fin thickness is held constant, for different base plate temperatures. Computational results show that the phase change time and consequently heat absorption and release rate depends on thermal and geometrical parameters such as fin spacing, thickness and height. Results are presented in terms of Nusselt number and melt fraction versus time.

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