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化工学报  2015 

空调用纳米有机复合相变蓄冷材料制备与热物性

DOI: 10.11949/j.issn.0438-1157.20141252, PP. 1208-1214

Keywords: 有机相变材料,空调蓄冷,纳米材料,热物性,强化传热,热传导,制备

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Abstract:

针对目前空调用有机相变蓄冷材料热导率低的问题,将具有高导热性的纳米材料(MWNTs、Al2O3、Fe2O3)添加到所开发制备的二元复合有机蓄冷材料(质量比73.7:26.3的辛酸/肉豆蔻醇)中,从纳米材料的种类和浓度两方面,研究其对复合有机蓄冷材料热物性的影响。实验发现:对于MWNTs、Al2O3、Fe2O33种纳米材料,当其质量分数分别小于0.3%、0.4%、0.8%时,对应纳米复合材料热导率随纳米材料浓度的增加幅度较为明显;与原二元复合有机相变蓄冷材料相比,添加0.3%的MWNTs,热导率提高26.3%;添加0.4%的Al2O3,热导率提高13.1%;添加0.8%的Fe2O3,热导率提高32.1%;当在一定纳米材料质量分数(如0.7%)下,加入纳米颗粒的复合材料导热性能效果依次为Fe2O3>MWNTs>Al2O3。不同纳米粒子的添加对原蓄冷材料的相变温度和相变潜热影响很小,相变温度变化波动最大为0.4℃,相变潜热变化波动范围最大为1.4%。

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