Preparation and properties of lauric-palmitic-stearic acid eutectic mixture/ expanded graphite composite phase change material for energy storage

doi:10.3969/j.issn.0438-1157.2014.z2.042

CIESC Journal ›› 2014, Vol. 65 ›› Issue (z2): 286-292.DOI: 10.3969/j.issn.0438-1157.2014.z2.042

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Preparation and properties of lauric-palmitic-stearic acid eutectic mixture/ expanded graphite composite phase change material for energy storage

YUAN Yaguang, YUAN Yanping, ZHANG Nan, LI Tianyu, CAO Xiaoling

School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

Received:2014-08-11 Revised:2014-08-18 Online:2014-12-30 Published:2014-12-30
Supported by:
supported by the National Natural Science Foundation of China (51378426), the Program of Ministry of Education of China for New Century Excellent Talents (NCET-11-0714) and the Special Funds for Building Energy Efficiency Projects in Sichuan Province.

月桂酸-棕榈酸-硬脂酸/膨胀石墨复合相变材料的制备及性能

袁亚光, 袁艳平, 张楠, 李天宇, 曹晓玲

西南交通大学机械工程学院, 四川成都 610031

通讯作者: 袁艳平
基金资助:
国家自然科学基金项目(51378426);教育部新世纪优秀人才基金项目(NCET-11-0714);四川省省级建筑节能专项资金项目;四川省科技创新苗子工程项目(2014-122);西南交通大学研究生创新实验实践项目(YC201402206)。

Abstract

Abstract:

Based on theoretical calculation, lauric acid-palmitic acid-stearic acid ternary eutectic mixture (LA-PA-SA) was obtained firstly. Then, the LA-PA-SA/expanded graphite (EG) composite phase change material (PCM) with an optimum mass ratio of LA-PA-SA: EG=15:1 was prepared by the porous structure of EG. The prepared LA-PA-SA/EG composite PCM are characterized by the scanning electron microscope (SEM), Fourier transformation infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), thermal cycling and thermal performance test. The results showed that LA-PA-SA uniformly distributed in the porous network structure of EG due to the capillary action and surface tension. The melting and freezing temperatures and latent heats of the LA-PA-SA/EG composite PCM were 32.1℃ and 30.3℃, and 143.2 J·g^-1 and 143.1 J·g^-1 respectively. Thermal cycling test results showed LA-PA-SA/EG had a good thermal and chemical reliability after 1000 thermal cycles. Thermal performance test results indicated that the rate of thermal energy storage and release was accelerated due to the high thermal conductivity of EG.

Key words: eutectic mixture, expanded graphite, composite phase change material, structure, thermal properties

摘要：

以理论计算为基础,制备了月桂酸-棕榈酸-硬脂酸三元低共熔混合物(LA-PA-SA)。利用膨胀石墨(EG)的网状多孔结构,制备了最佳质量配比为15:1(LA-PA-SA:EG)的LA-PA-SA/EG复合相变材料。综合利用FT-IR、SEM、DSC、冷热加速循环和蓄放热实验等对复合相变材料的结构和性能进行了研究。结果表明:LA-PA-SA通过物理吸附作用均匀分布于EG的多孔结构中;复合相变材料的熔化和凝固温度分别为32.1℃和30.3℃,熔化和凝固潜热分别为143.2 J·g^-1和143.1 J·g^-1;经过1000次冷热循环后具有良好的热稳定性和化学稳定性;EG的高导热性加快了复合相变材料的蓄放热速率。

关键词: 低共熔混合物, 膨胀石墨, 复合相变材料, 结构, 热性能

CLC Number:

TK512

YUAN Yaguang, YUAN Yanping, ZHANG Nan, LI Tianyu, CAO Xiaoling. Preparation and properties of lauric-palmitic-stearic acid eutectic mixture/ expanded graphite composite phase change material for energy storage[J]. CIESC Journal, 2014, 65(z2): 286-292.

袁亚光, 袁艳平, 张楠, 李天宇, 曹晓玲. 月桂酸-棕榈酸-硬脂酸/膨胀石墨复合相变材料的制备及性能[J]. 化工学报, 2014, 65(z2): 286-292.

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Preparation and properties of lauric-palmitic-stearic acid eutectic mixture/ expanded graphite composite phase change material for energy storage

月桂酸-棕榈酸-硬脂酸/膨胀石墨复合相变材料的制备及性能

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