共晶体系
材料科学
复合数
热能储存
热稳定性
石墨
陶瓷
热导率
热的
相变材料
化学工程
复合材料
微观结构
热力学
物理
工程类
作者
Xiaofeng Ran,Haoran Wang,Yajuan Zhong,Feng Zhang,Jun Lin,Hua Zou,Zhimin Dai,Bei An
标识
DOI:10.1016/j.solmat.2021.111047
摘要
Eutectic chloride salts are a new and novel type of thermal energy storage (TES) material for high-temperature solar TES systems. Their thermal properties and stability are key factors in determining their application in TES systems. In this study, we prepared and characterized eutectic NaCl–KCl–MgCl2/α-alumina/expanded graphite (EG) composite phase change materials (PCMs). The results show that eutectic salts, α-alumina and EG have good crystalline properties and chemical compatibility. The elements are relatively uniform in distribution within the pores and channels. Moreover, the Na, K, and Mg distributions occupy the same locations, indicating the excellent eutectic properties of the salts. The latent heat of composite PCMs decreases with the increase in α-alumina and EG percentage, while the addition of EG to the eutectic salts/α-alumina composite PCM improves the thermal conductivity of the composite PCMs by more than 6 times, from 0.85 to 5.10 W/(m·K). Moreover, after 50, 100, and 300 heating–cooling cycles at 550 °C, the composite PCMs demonstrate enhanced thermal and physical properties at high temperatures. The improved thermal characteristics of composite PCMs with α-alumina and EG allow for promising applications of high-temperature solar TES systems.
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