Enhanced thermal properties of stearic acid/carbonized maize straw composite phase change material for thermal energy storage in buildings

文献类型： 外文期刊

第一作者： Wen, Ruilong

作者： Wen, Ruilong;Wen, Ruilong;Liu, Yifeng;Yang, Chen;Zhu, Xiao;Huang, Zhaohui;Zhang, Xianmei;Gao, Wei

作者机构：

关键词： Stearic acid; Carbonized maize straw; Form-stable PCM; Thermal energy storage; Thermal conductivities

期刊名称：JOURNAL OF ENERGY STORAGE （ 影响因子：3.762； ）

ISSN： 2352-152X

年卷期： 2021 年 36 卷

页码：

收录情况： SCI

摘要： The application of organic phase change material (PCM) using in thermal energy storage system was limited by low thermal conductivity and leakage problem. In this paper, we reported a low-cost supporting material with good thermal conductivity by carboning the biomass of maize straw. The composite PCM of stearic acid (SA)/carbonized maize straw (CMS) was prepared via vacuum impregnation process and characterized by XRD, FT-IR, SEM. The results show that SA/CMS has good chemical compatibility. DSC, TGA as well as thermal conductivity and thermal history method were used to evaluate the thermal properties of SA/CMS. The DSC result reveals that the composite SA/CMS melted at 67.62 degrees C with the latent heat of 160.74 J/g and freezed at 65.28 degrees C with the latent heat of 160.47 J/g. The maximum loading capacity of SA in composite of SA/CMS reached 77.22%. TGA and DTG results show SA/CMS have good thermal stability. Thermal conductivity of SA/CMS reached 0.30 W/(m.K), which was 87.5% higher than that of the pure SA. Compared with SA, the melting time of SA/CMS reduced 50% and the freezing time reduced 73%. 200 thermal cycling test shows the SA/CMS exhibits excellent thermal reliability. Based on all results, it can be expected that the form-stable composite PCM of SA/CMS has good potential application in solar heat energy storage system and energy-efficient buildings.

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