Enhanced thermal conductivity of composite phase change materials based on carbon modified expanded perlite

被引：42

作者：

Li, Runjie ^{[1
]}

Zhao, Yajing ^{[2
]}

Xia, Boyang ^{[1
]}

Dong, Zhensheng ^{[3
]}

Xue, Song ^{[1
]}

Huo, Xiaotong ^{[4
]}

Wu, Xiaowen ^{[2
]}

Liu, Yan'gai ^{[2
]}

Huang, Zhaohui ^{[2
]}

Fang, Minghao ^{[2
]}

Min, Xin ^{[2
]}

Zhang, Xiaoguang ^{[5
]}

机构：

[1] China Univ Geosci Beijing, Sch Sci, Beijing 100083, Peoples R China

[2] China Univ Geosci Beijing, Sch Mat Sci & Technol, Beijing Key Lab Mat Utilizat Nonmet Minerals & So, Natl Lab Mineral Mat, Beijing 100083, Peoples R China

[3] China Univ Geosci Beijing, Sch Engn & Technol, Beijing 100083, Peoples R China

[4] PetroChina Beijing Gas Pipeline Co Ltd, Beijing 100101, Peoples R China

[5] Peking Univ, Beijing Key Lab Magnetoelect Mat & Devices, Beijing Innovat Ctr Engn Sci & Adv Technol, Dept Mat Sci & Engn,Coll Engn, Beijing 100871, Peoples R China

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2021年 / 261卷

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Carbon modified expanded perlite; Polyethylene glycol; Composite phase change materials; Thermal conductivity; Chemical stability;

D O I：

10.1016/j.matchemphys.2021.124226

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Phase change materials (PCMs) have attracted growing attention in clean energy storage fields. To improve the thermal conductivity of porous mineral-based composite PCMs (c-PCMs), pretreatment via in-situ carbonization is proposed to fill the pore structure with thermally conductive carbon. After vacuum impregnation, high-performance c-PCMs are obtained, comprising carbon-modified expanded perlite (EPC) and polyethylene glycol (PEG). The modified micro-pores optimize the heat transfer characteristic behaviors in c-PCMs and improve the adsorption stability of PEG. Thus, the load capacity of PEG reaches approximately 73.90 wt% in EPC/PEG cPCMs, providing excellent chemical and structural stability among perlite matrix, carbon modifier and PEG PCMs. The thermal conductivity of the EPC/PEG c-PCMs is 0.521 W/(m.K), which is almost 1.3 times that of the pristine PEG. These performances indicate that the EPC/PEG c-PCMs could be used as an environmentally friendly material for external wall heat-insulation application.

引用

页数：8

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