In this work numerically, the efficacy of dispersion of copper-oxide-nanoparticles (CuO) with different volume fractions on the melting performance of paraffin RT82 as phase-change-material (PCM) in a multi-tube heat exchanger have been discussed. The efficacy of nanoparticle combination on the flow structure and heat transfer attributes at various steps of the PCM melting process were analyzed and evaluated. Attaining a minimum melting time is regarded as the purpose of the optimization procedure. The melting time is considered for the whole volume fraction of the nanoparticles and the entrance temperature of the heat-transfer-fluid. The results demonstrate that the dispersion of CuO nanoparticles with a volumetric fraction of 3–7% will save the total melting time between 8.07% and 22.18%. The results also show that although the addition of nanoparticles in the primary stages of the melting process is not very effective, the melting rate increases over time and or increases the volume fraction. It can also understand from the outcomes with an increment in the number of internal tubes, the melting speed is increased to 11.74%. Also, the results show that increasing the distance between the tubes will increase the melting time between 15.36% and 20.57%, and more time will need to melt NanoPCM.

在这项工作中，数值讨论了不同体积分数的氧化铜纳米颗粒 (CuO) 的分散对多管换热器中作为相变材料 (PCM) 的石蜡 RT82 熔化性能的影响。分析和评估了纳米颗粒组合对 PCM 熔化过程各个步骤的流动结构和传热属性的功效。达到最小熔化时间被认为是优化程序的目的。考虑纳米颗粒的整个体积分数和传热流体的入口温度的熔化时间。结果表明，体积分数为 3-7% 的 CuO 纳米颗粒的分散将节省 8.07% 至 22.18% 的总熔化时间。结果还表明，虽然在熔化过程的初级阶段添加纳米颗粒不是很有效，但熔化速率随着时间的推移而增加和/或增加了体积分数。从结果中也可以看出随着内管数量的增加，熔化速度提高到11.74%。此外，结果表明，增加管子之间的距离会使熔化时间增加 15.36% 到 20.57%，并且需要更多的时间来熔化 NanoPCM。