化工学报2019，Vol.70Issue(4)：1272-1280,9.DOI:10.11949/j.issn.0438⁃1157.20180936
组合相变材料强化固液相变传热可视化实验
Visualized experiment on solid-liquid phase change heat transfer enhancement with multiple PCMs
摘要
Abstract
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.关键词
组合相变材料/蓄热/相界面/温度分布/可视化Key words
multiple PCMs/thermal energy storage/phase interface/temperature distribution/visualization分类
能源科技引用本文复制引用
王慧儒,刘振宇,姚元鹏,吴慧英..组合相变材料强化固液相变传热可视化实验[J].化工学报,2019,70(4):1272-1280,9.基金项目
国家重点研发计划项目(2017YFB0601801) （2017YFB0601801）
中央高校基本科研业务费专项资金(JB2018125) （JB2018125）
