Preparation and thermal energy storage properties of paraffin/expanded graphite composite phase change material
Preparation and thermal energy storage properties of paraffin/expanded graphite composite phase change material
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DOI：
10.1016/j.apenergy.2011.10.014
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发表时间：
2012-03-01
期刊：
影响因子：
11.2
通讯作者：
Fang, Yutang
中科院分区：
文献类型：
--
作者：
Zhang, Zhengguo;Zhang, Ni;Fang, Yutang
通过将液体石蜡吸收到EG中制备了石蜡/膨胀石墨（EG）复合相变材料（PCM），其中选择石蜡作为PCM。 EG是通过在室温下进行微波辐射来生产的。结果发现，在 800 W 辐照功率 10 s 下制备的 EG 对石蜡的最大吸附容量为 92 wt%。扫描电镜图像显示石蜡均匀分散在EG的孔内。差示扫描量热仪分析表明，复合相变材料的熔融温度与石蜡接近，其潜热相当于根据复合材料中石蜡质量分数计算的值。 X射线衍射分析表明，复合PCM只是石蜡与EC的结合体，没有产生新物质。复合 PCM 的热能存储性能在潜热能存储 (LTES) 系统中进行了测试。在 LTES 中获得了复合 PCM 和石蜡的轴向和径向温度分布的瞬态。与石蜡相比，复合相变材料的蓄热充电持续时间明显缩短。 (C) 2011 Elsevier Ltd. 保留所有权利。
The paraffin/expanded graphite (EG) composite phase change material (PCM) was prepared by absorbing liquid paraffin into EG, in which paraffin was chosen as the PCM. EG was produced by microwave irradiation performed at room temperature. It was found that the EG prepared at 800 W irradiation power for 10 s exhibited the maximum sorption capacity of 92 wt% for paraffin. Scanning electron microscopy images showed that paraffin was uniformly dispersed in the pores of EG. Differential scanning calorimeter analysis indicated that the melting temperature of the composite PCM was close to that of paraffin, and its latent heat was equivalent to the calculated value based on the mass fraction of paraffin in the composite. X-ray diffraction analysis showed that the composite PCM was just a combination of paraffin with EC, and no new substance was produced. Thermal energy storage performance of the composite PCM was tested in a latent thermal energy storage (LTES) system. Transients of axial and radial temperature profiles were obtained in the LTES for the composite PCM and paraffin. The thermal energy storage charging duration for the composite PCM was reduced obviously compared to paraffin. (C) 2011 Elsevier Ltd. All rights reserved.