Abstract:

Using paraffin wax and copper metal foam, copper metal foam composite phase change materials were prepared in this study. The effect of the copper metal foam proportion on heat transfer enhancement in the melting process of PCMs was analyzed using visualization heat storage experimental equipment. The integrated heat transfer coefficient of the copper metal foam composite PCMs was obtained. The experimental results showed that when the copper metal foam proportion was 0, 0.43%, 1.29% and 2.15%, the integrated heat transfer coefficient of the composite phase change material first decreased and then increased, which was 1.26W/(m·K), 1.18W/(m·K), 1.44W/(m·K) and 1.88W/(m·K), respectively. Thus, with the increase of copper metal foam proportion, the melting time of composite phase change materials increased first and then decreased. In addition, as the proportion of copper metal foam increased from 0.43% to 2.15%, the proportion of heat conduction in the heat transfer mechanism rose from 17.26% to 86.01% and the proportion of natural convection dropped from 82.74% to 13.99%.

Key words: phase change heat storage, copper metal foam, phase change materials, natural convection intensity, integrated heat transfer coefficient

摘要：

基于石蜡和高孔密度的泡沫铜制备了复合相变蓄热材料，设计并搭建了一套可视化蓄热实验装置，分析了高孔密度下泡沫铜填充率对石蜡相变过程的强化传热机理，得到了复合相变蓄热材料的综合传热系数。实验结果表明，当泡沫铜填充率为0、0.43%、1.29%和2.15%时，复合相变材料的综合传热系数先减小后增大，分别为1.26W/(m·K)、1.18W/(m·K)、1.44W/(m·K)和1.88W/(m·K)，因此随着泡沫铜填充率的增加，复合相变材料的融化时间先增长后缩短。此外，随着泡沫铜填充率从0.43%增至2.15%，复合相变材料融化时传热机制中导热占比从17.26%上升到86.01%，自然对流占比从82.74%下降到13.99%。

关键词: 相变蓄热, 泡沫金属, 相变材料, 对流换热强度, 综合传热系数