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Du, Zhao; Liu, Gang; Huang, Xinyu; Xiao, Tian; Yang, Xiaohu; He, Ya-Ling
International journal of heat and mass transfer, July 2023, 2023-07-00, Volume: 208Journal Article
•A 3-D numerical model of the square LHS unit melting process is established.•The melting properties of four different structures are quantitatively compared.•The melting time, temperature uniformity and total heat storage are discussed.•The effect of strengthening method is studied in depth by dynamic temperature study. The low thermal conductivity of phase change materials limits the large-scale application of latent heat storage technology. It is meaningful to improve the thermal conductivity of phase change materials by corresponding means. In order to improve the performance of latent heat storage device, this paper takes square latent heat storage device as the research object, and uses fin and foam metal to enhance its melting performance. A 3-D numerical model is established and verified by visualization experiment. The quantitative comparison of melting properties of four different structures (pure paraffin, fin, metal foam, fin-metal foam) is presented. The results show that compared with pure paraffin structure, the complete melting time of phase change materials corresponding to fin, metal foam, and fin-metal foam structure is reduced by 47.48%, 79.53%, and 83.68%, respectively. The temperature uniformity increased by 28.97%, 79.37%, and 91.12%, and the total heat storage decreased by 6.0%, 4.6%, and 11.64%, respectively. It shows that the addition of fin and foam metal is beneficial to improve the melting performance and the overall temperature uniformity of the device, but it has a negative effect on total heat storage. Dynamic temperature studies were conducted to further explore the effect of fins and metal foam on the internal melting process compared with pure paraffin structure.
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