采用多次真空灌注方法将石蜡吸附到多孔的泡沫石墨中,制备出了泡沫石墨/石蜡复合相变储热材料。利用Hot Disk热常数分析仪和差示扫描量热分析（DSC）对该复合材料的热性能进行了测试,结果表明,石蜡充分吸附到泡沫石墨的蜂窝状微孔中,泡沫石墨的填充极大地强化了相变材料的导热能力。研究了将该复合材料用作墙体围护结构时的隔热和调温性能,并与普通轻质墙体材料作围护结构进行了对比,结果表明,复合相变储热材料能够有效地利用昼夜温差进行储热放热,有效地阻止了热量进入室内,可明显降低室内温度波动和最大值,提高人体舒适度,具有较好的调温隔热效果。
Graphite foam-paraffin composite as a phase change material （PCM） was manufactured by melting and perfusing the paraffin into the porous graphite foams, which has high thermal conductivity under vacuum condition. Thermal properties of the composite material were tested by using hot disk and differential scanning calorimeter （DSC）. And the results show that paraffin can he uniformly absorbed into the pores network of graphite foams, and the composite exhibits much higher thermal conductivity than pure paraffin due to the heat transfer enhancement induced by graphite foams. Also, an experimental study was carried on the abilities of heat insulation and thermal control with the composite PCM which was applied as the building envelope. Comparing with the normal lightweight wall material, the composite material makes full use of the day and night temperature difference for the heat storage and release, thus represents better heat insulation effect from outdoor to inside. Meanwhile, it can evidently reduce the max temperature and temperature fluctuation in the room, hence greatly increases the indoor comfort level.
参考文献
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