The investigation of thermal conductivity and energy storage properties of graphite/paraffin composites
The investigation of thermal conductivity and energy storage properties of graphite/paraffin composites
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DOI：
10.1007/s10973-011-1467-z
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发表时间：
2012-03
影响因子：
4.4
通讯作者：
Nan Wang;X. Zhang;D. Zhu;J. W. Gao
中科院分区：
文献类型：
--
作者：
Nan Wang;X. Zhang;D. Zhu;J. W. Gao
相变材料（PCM）因其在热储能（TES）中的广泛应用而受到广泛关注。石蜡被认为是最具发展前景的高分子材料之一。然而，较低的热导率阻碍了进一步的应用。在这封信中，我们实验研究了由石蜡和微米尺寸石墨片（MSGFs）组成的复合材料的导热性和储能性。结果表明，随着MSGFs质量分数的增加，导热系数显著提高。热流网络的形成是这种情况下高导热系数的关键因素。同时，与导热系数相比，复合材料的潜热容、熔融温度和冻结温度随MSGFs浓度的增加变化可以忽略不计。石蜡基复合材料具有较大的储能应用潜力。
Phase change materials (PCM) have been extensively scrutinized for their widely application in thermal energy storage (TES). Paraffin was considered to be one of the most prospective PCMs with perfect properties. However, lower thermal conductivity hinders the further application. In this letter, we experimentally investigate the thermal conductivity and energy storage of composites consisting of paraffin and micron-size graphite flakes (MSGFs). The results strongly suggested that the thermal conductivity enhances enormously with increasing the mass fraction of the MSGFs. The formation of heat flow network is the key factor for high thermal conductivity in this case. Meanwhile, compared to that of the thermal conductivity, the latent heat capacity, the melting temperature, and the freezing temperature of the composites present negligible change with increasing the concentration of the MSGFs. The paraffin-based composites have great potential for energy storage application with optimal fraction of the MSGFs.