Numerical study of a novel dual-PCM thermal energy storage structure filled with inorganic salts and metal alloy as the PCMs

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Abstract

In this paper a novel dual-PCM TES structure filled with inorganic salts and metal alloy as the PCMs is proposed. Tubes encapsulated with metal PCM are inserted in the inorganic salt PCM, and they serve as both heat storage material and heat transfer enhancement units for fast storing or releasing heat from inorganic salt PCM. By comparing the reinforcement effect of metal PCM and solid metal, the metal PCM has obvious strengthen effect on TES tank. The numerical simulation results show that after inserted tubes encapsulated with metal PCM with high thermal conductivity, the charging time of TES tank is significantly reduced. Temperature and streamtrace distribution shows that natural convection in liquid metal can quickly transmit heat from heat source to low temperature inorganic salt, the reinforcement of metal PCM is better than solid metal.

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Wang, G., Xu, C., Wei, G., & Du, X. (2019). Numerical study of a novel dual-PCM thermal energy storage structure filled with inorganic salts and metal alloy as the PCMs. In Energy Procedia (Vol. 158, pp. 4423–4428). Elsevier Ltd. https://doi.org/10.1016/j.egypro.2019.01.774

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