摘要
本文以十二烷为相变材料,利用膨胀石墨多孔吸附特性制备出十二烷/膨胀石墨复合相变蓄冷材料。通过扫描电镜(SEM)、差示扫描量热仪(DSC)和热常数分析仪(HotDisk)对复合相变材料的结构及热性能进行了表征。实验结果表明,十二烷被膨胀石墨均匀吸附,吸附后膨胀石墨保持了原来的疏松多孔的蠕虫状形态。复合相变材料的相变焓值随着添加的膨胀石墨质量分数增加而降低,导热系数随着添加的膨胀石墨质量分数增加而增加。相变材料质量分数为80%,复合相变材料熔化焓和凝固焓分别为132.8 J/g和132.5 J/g,表观密度为700 kg/m^3时,导热系数为2.64 W/(m·K)。复合相变材料具有良好的热循环稳定性能。
In this paper,the dodecane was chosen as phase change material(PCM) to prepare the composite PCM for cold thermal energy storage by absorbing dodecane into expanded graphite(EG) with porous adsorption characteristics.The microstructure and thermal properties of the novel composite PCM were investigated by scanning electron micrographs(SEM),differential scanning calorimeter(DSC),and thermal constant analyzer.SEM images showed that dodecane was uniformly dispersed in the pores of EG without changing the original porous state of EG.Thermal constant analyzer and DSC analysis indicated that the increase of EG mass fraction resulted in a rising trend of thermal conductivity but a declining trend of enthalpy in the composite PCM.The composite PCM has a good thermal stability and recyclability that the melting and solidification enthalpy in80%mass fraction was 132.8 J/g and 132.5 J/g,respectively and the thermal conductivity was 2.64W/(m·K)in the apparent density of 700 Kg/m^3.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2015年第6期1307-1310,共4页
Journal of Engineering Thermophysics
基金
广东省自然科学基金研究团队项目(No.2014A030312009)
国家自然科学基金(No.U1407132)
关键词
相变材料
蓄冷
膨胀石墨
十二烷
phase change material
cold thermal energy storage
expanded graphite
dodecane
