WU Shaofei1,2, YAN Ting1,2, KUAI Zihan1,2, PAN Weiguo1,2
1 College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China 2 Key Laboratory of Clean Power Generation and Environmental Protection Technology in Mechanical Industry, Shanghai 200090, China
Abstract: Hexadecanoicacid (HA) was selected as the substrate and expanded graphite (EG) was adopted as the supporting material of high thermal conductivity. High form-stable precision HA/EG composite phase change materials (PCMs) were fabricated by the improved method of melting blend-solidification and form-stability. Thermal properties of form-stable PCMs samples with different parameters were systematically measured. The effects of microstructure, functional group distribution, crystalline phase, mass fraction of EG and sample density on the properties of form-stable PCMs were investigated by various instruments. The results showed that the blend of HA and EG were more uniformly and the combination degrees were enhanced with the increasing mass fraction and density of HA, which was absorbed into the porous structure of EG by physical interaction rather than chemical reaction. The melting enthalpy of pure HA and form-stable PCMs with the EG mass fraction and sample density of 30% and 900 kg/m3 were 275.35 kJ/kg and 193.01 kJ/kg, and the melting point of 59.53 ℃ and 61.08 ℃, respectively. The horizontal thermal conductivity of the latter was as high as 38.42 W/(m·K), which was about 236 times higher than that of pure HA (0.162 W/(m·K)). The vertical thermal conductivity of the latter was 2.68 W/(m·K), which was less than one-fourteenth of the horizontal, which showed high anisotropy. The cyclic stability test results of all the samples suggested that the EG mass fraction of 24% and 30% with samples had a slight leakage, which were lower than 0.85% and exhibited the wonderful cycle stability. HA/EG form-stable PCM was a kind of latent heat storage material with excellent performance, which had a broad application prospect in solar thermal utilization.
作者简介: 潘卫国,上海电力大学教授,博士研究生导师,享受国务院政府特殊津贴。1994和1997年在浙江大学工程热物理专业获工学硕士和博士学位。2000年破格晋升教授,发表学术论文200余篇,申请国家发明专利70余项,出版中英文学术著作和教材6部。他领衔的团队主要研究电厂节能减排和可再生能源的高效利用等方向。 闫霆,上海电力大学讲师。2016年博士毕业于上海交通大学动力工程及工程热物理专业,2016至今为上海电力大学讲师。研究方向为热能储存及低品位热能的回收利用。在Energy Storage Materials、Rene-wable and Sustainable Energy Reviews、Energy、Renewable Energy等国际顶级期刊上发表论文10余篇,申请国家专利10余项
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2021, Vol. 35 
