不同孔隙结构的炭材料作为石蜡相变储能材料强化传热载体

以石墨泡沫(Graphite foam,GF)、炭毡(Carbon felt,CF)和压缩膨胀石墨(Compressed expansed natural graphite,CENG)作为相变储能材料(Phase change material,PCM)石蜡的强化传热载体,制备了三种不同结构炭材料-石蜡相变储能材料体系.采用扫描电镜(SEM)、激光热导仪和差示扫描量热仪(DSC)对其结构和热性能进行了表征和测试.结果表明:浸蜡后的GF、CF和CENG的热导率分别比纯石蜡的热导率提高了437倍、14倍和25倍;比较三种储能材料体系的储能行为发现,三种储能材料体系的相变潜热分别为42.34 J/g, 48.38 J/g和57.82 J/g.

Carbon matrices with different pore structures as heat transfer intensifier in paraffin wax/carbon thermal energy storage system

Graphite foam, carbon felt and compressed expanded natural graphite (CENG) were used to increase the heat transfer ability of paraffin wax as latent heat storage (LHS) medium. Structure and thermal properties of the paraffin wax-carbon LHS system were characterized using the scanning electron microscopy, laser flash technique and differential scanning calorimetry. Results indicated that the thermal conductivities of paraffin wax-graphite foam, paraffin wax-carbon felt and paraffin wax-CENG systems were enhanced by a factor of 437, 14 and 25 times, respectively, compared with pure paraffin wax and their latent heats were 42.34 J/g, 48.38 J/g and 57.82 J/g respectively.