In this paper, the melting and solidification characteristics of RT35 in vertical cylindrical latent heat storage system with annular fins are studied. The unequal fin length arrangements are proposed with constant fins volume. In order to evaluate the performance of the heat storage system, taking the structure of fins with equal length as reference, the growth rate is proposed (sum of heat storage and release increment and heat storage and release time reduction). The results show that the proposed initial optimized structures can improve the melting process, to further improve the thermal performance, the method of partition is proposed for quadratic optimization. It is found that the quadratic optimized structures show superior thermal performance in both melting and solidification processes. When the partition number is four, the growth rates in melting and solidification process are 29.91% and 13.15% respectively. Additionally, a correlation is developed to predict the total melting time which will be useful for the design of the fins in the latent heat storage system.

本文研究了RT35在带有环形翅片的垂直圆柱形潜热蓄热系统中的熔化和凝固特性。提出了不等长的鳍片长度布置，并具有恒定的鳍片体积。为了评估储热系统的性能，以等长鳍片的结构为参考，提出了增长率（储热与释放增量之和以及储热与释放时间的减少）。结果表明，所提出的初始优化结构可以改善熔化过程，进一步改善热性能，提出了分区优化方法进行二次优化。发现二次优化结构在熔融和凝固过程中均显示出优异的热性能。当分区号为4时，熔融和凝固过程的增长率分别为29.91％和13.15％。另外，建立了相关性以预测总熔化时间，这对于潜热存储系统中的翅片的设计将是有用的。