Preparation and properties of palmitic-stearic acid eutectic mixture/expanded graphite composite as phase change material for energy storage
Preparation and properties of palmitic-stearic acid eutectic mixture/expanded graphite composite as phase change material for energy storage
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DOI：
10.1016/j.energy.2014.10.092
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发表时间：
2014-12
期刊：
影响因子：
9
通讯作者：
Nan Zhang;Yanping Yuan;Yanxia Du;Xiaoling Cao;Yaguang Yuan
中科院分区：
文献类型：
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作者：
Nan Zhang;Yanping Yuan;Yanxia Du;Xiaoling Cao;Yaguang Yuan
以棕榈酸-硬脂酸(PA-SA)共晶混合物为相变材料，膨胀石墨(EG)为支撑材料，制备了一种新型复合相变材料。确定了PA-SA/EG(棕榈酸-硬脂酸/膨胀石墨)复合相变材料的最佳吸附比为PA-SA：EG=11.3：1(质量比)。扫描电子显微镜和傅里叶变换红外光谱结果表明，由于物理作用，PA-SA均匀分布在EG的多孔网络结构中。用差示扫描量热法(DSC)和热重分析法(TGA)对PA-SA/EG复合相变材料的热性能和热稳定性进行了表征。差示扫描量热分析结果表明，PA-SA/EG的熔融、冻结温度和潜热分别为53.89℃和54.37℃，166.27℃和166.13℃，热重分析表明PA-SA/EG在工作温度范围内具有良好的热稳定性。热循环试验结果表明，PA-SA/EG复合材料经720次热循环后具有良好的热可靠性。复合相变材料的导热系数为2.51W/m·K，远高于PA-SA。由于EG具有较高的导热系数，PA-SA/EG的储热和释热速率也有所提高。综上所述，所制备的PA-SA/EG复合相变材料具有良好的热性能、良好的热可靠性和稳定性、较高的导热系数，可作为潜在的储能材料。
A novel composite PCM (phase change material) with PA-SA (palmitic-stearic acid) eutectic mixture as PCM and EG (expanded graphite) as supporting material was prepared. The optimum absorption ratio of PA-SA/EG (Palmitic-stearic acid/expanded graphite) composite PCM was determined as PA-SA:EG = 13:1 (by mass). Scanning electron microscope and Fourier transformation infrared spectroscopy results show that PA-SA was uniformly distributed in the porous network structure of EG due to the physical action. Thermal property and thermal stability of the PA-SA/EG composite PCM were characterized by DSC (differential scanning calorimetry) and TGA (thermogravimetric analysis). DSC results indicated that the melting and freezing temperatures and latent heats of PA-SA/EG were measured as 53.89 °C and 54.37 °C, and 166.27 J/g and 166.13 J/g. TGA test results revealed that PA-SA/EG had a good thermal stability in working temperature range. Thermal cycling test results showed PA-SA/EG had a good thermal reliability after 720 thermal cycles. Thermal conductivity of the composite PCM was measured as 2.51 W/m K, much higher than that of PA-SA. The thermal energy storage and release rates of PA-SA/EG were also increased due to the high thermal conductivity of EG. In conclusion, the prepared PA-SA/EG composite PCM can be acted as a potential material for thermal energy storage due to the acceptable thermal properties, good thermal reliability and stability, high thermal conductivity.