低温相变蓄热材料性能研究及在移动蓄热装置中应用

Properties of low temperature phase change heat storage materials and their applications in mobile heat storage devices

基于当前对KAl(SO_(4))_(2)·12H_(2)O蓄热性能研究较少且很少有蓄热装置应用KAl(SO_(4))_(2)·12H_(2)O作为相变蓄热材料的问题。对KAl(SO_(4))_(2)·12H_(2)O的制备和蓄热性能进行了总结以及热力学性能分析,得出环境温度及初始温度对相变材料?效率影响较小,终止温度对?效率影响较大;当初始温度为328K,环境温度288K时,最佳终止温度为370K。同时,针对KAl(SO_(4))_(2)·12H_(2)O应用于移动蓄热装置进行数值模拟,得到液相率、温度随时间的变化曲线。本文研究表明KAl(SO_(4))_(2)·12H_(2)O是一种性能良好的低温蓄热材料。

At present,there are few researches on the thermal storage performance of KAl(SO_(4))_(2)·12H_(2)O and few thermal storage devices use KAl(SO_(4))_(2)·12H_(2)O as phase change heat storage material.The preparation and thermal storage performance of KAl(SO_(4))_(2)·12H_(2)O were summarized and the thermodynamic performance was analyzed.The thermodynamic performance analysis showed that the ambient temperature and initial temperature had little influence on the exergy efficiency of PCM,while the termination temperature had greater influence on the exergy efficiency.When the initial temperature is 328K and the ambient temperature is 288K,the optimal termination temperature is 370K.At the same time,KAl(SO_(4))_(2)·12H_(2)O was applied to the mobile heat storage device by numerical simulation,and the change curves of liquid phase ratio and temperature with time were obtained.It shows that KAl(SO_(4))_(2)·12H_(2)O is a kind of low temperature heat storage material with good performance.