Visualized experiment on solid-liquid phase change heat transfer enhancement with multiple PCMs

被引：0

作者：

Wang H. ^{[1
]}

Liu Z. ^{[1
]}

Yao Y. ^{[1
]}

Wu H. ^{[1
]}

机构：

[1] School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai

来源：

Huagong Xuebao/CIESC Journal | 2019年 / 70卷 / 04期

关键词：

Multiple PCMs; Phase interface; Temperature distribution; Thermal energy storage; Visualization;

D O I：

10.11949/j.issn.0438-1157.20180936

中图分类号：

学科分类号：

摘要：

Visualization experiments were carried out on the melting-solidification cycle process and heat transfer characteristics of the multiple phase change materials (multiple PCMs) using high-definition cameras and infrared thermal imaging technology. Three paraffins (RT65, RT42 and RT27) were used as multiple PCMs and filled into the TES container. The effect of PCM arrangement on thermal performance of the TES container was investigated. The dynamic evolution of solid-liquid interfaces was recorded by a high definition (HD) camera and the variation of temperature distribution was measured by an infrared camera. As the melting-solidification cyclic process was stabilized, the solid-liquid phase change behavior and thermal characteristics of the multiple-PCM TES container were obtained and compared with that of single-PCM TES container. The results show that the PCM with higher phase change temperature should be located near the heated wall. There exist multiple solid-liquid interfaces in multiple-PCM TES container, the paraffins in different PCM units can melt/solidify simultaneously. The uniformity of phase change rate is greatly improved by multiple PCMs, which increases the average phase change rate. The phase change fraction of multiple-PCM TES container is 40% higher than that of single-PCM TES container. Although the sensible heat storage capacity of multiple-PCM TES container is a little lower than that of single-PCM TES container, the variation rate of temperature is reduced, which enables the TES container work more stable. The latent heat storage capacity of TES container is significantly increased by the utilization of multiple PCMs. As a result, the total heat storage capacity of multiple-PCM TES container is 34.6% higher than that of single-PCM TES container. © All Right Reserved.

引用

页码：1263 / 1271

页数：8

共 30 条

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