Preparation and thermophysical properties of octadecane/ OBC/ EG composite shaped phase change material

被引：0
|
作者：
He Q. [1 ]
Wu M. [1 ]
Li T. [1 ]
Wang R. [1 ]
机构：
[1] Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷
关键词：
Heat conduction; Mixtures; OBC; Octadecane; Phase change;
D O I：
10.11949/0438-1157.20201504
中图分类号：
学科分类号：
摘要：
Aiming at the problem that leakage always happen in the phase change process of octadecane, olefin block copolymer (OBC) is used as the packaging structure to prepare composite stereotyped phase change materials (PCMs). Meanwhile, the low thermal conductivity of octadecane is improved by adding expanded graphite (EG). The results show that when the mass fraction of OBC is 10%, the leakage will happen in the phase change process. However, leakage has not been observed when the mass fraction of OBC is equal to or higher than 20%. When the mass fraction of OBC is 20%, the phase change enthalpy of the composite PCM is 166.87 J/g, and lower than that of pure ocadecane (227.40 J/g) by 26.62%. The thermal conductivity of composite phase change materials with different mass fraction of EG increases with the increase of the content of EG. When the mass fraction of EG is 5%, the thermal conductivity of the composite PCM is 4.179 W/(m∙K), which is about 16 times higher than that of the pure PCM [0.24 W/(m∙K)], indicating that EG could effectively improve the thermal conductivity of the composite PCM. In addition, the phase change enthalpy of composite PCM with 5% EG was about 149.54 J/g, and there was no significant change in phase change temperature and enthalpy after 50 cycles, indicating that the thermal stability of the composite PCM is great. Therefore, the composite phase change material has the utilization potentiality in building energy conservation. © 2021, Editorial Board of CIESC Journal. All right reserved.
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页码：539 / 545
页数：6
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