基于物质熵增纳米铜-赤藻糖醇循环稳定性分析

发布时间：2018-02-24 23:31

本文关键词： 纳米铜-赤藻糖醇热循环物质熵导热系数过冷度潜热　出处：《制冷学报》2017年03期 　论文类型：期刊论文

【摘要】：本文介绍了纳米铜-赤藻糖醇的配制方法,通过材料热物性变化的内部机理研究了循环过程中此相变材料(PCM)的衰减过程。根据差示扫描量热仪(DSC)以及导热系数测试仪(Hotdisk)的测试数据,对导热系数、过冷度、相变潜热在100次热循环过程中的0次、20次、40次、60次、80次、100次的变化原因进行了理论分析。采用热力学熵的热力学原理引出物质熵,从物质熵增的角度,总结了相变材料的衰减原因。结果表明:相变材料经过100次循环后,各项性能参数都出现了不同幅度的下降。导热系数随着纳米铜的添加量增加下降幅度减小;赤藻糖醇添加纳米铜后的过冷度整体上小于没有添加的过冷度;随着循环次数的增加,潜热值后期整体下降幅度加大。
[Abstract]:In this paper, the preparation method of nano-copper alginate alcohol was introduced. The decay process of PCM during the cycle was studied through the internal mechanism of the thermal physical properties of the material. Based on the measured data of DSC-and Hotdisk, the thermal conductivity and undercooling of the PCM were studied by means of the data of the differential scanning calorimeter (DSC) and the thermal conductivity tester (Hotdisk). The causes of the change of latent heat of phase change in the 100 cycles are theoretically analyzed. The thermodynamic principle of thermodynamic entropy is used to derive the entropy of matter, and from the point of view of the increase of entropy of matter, the change of latent heat of phase change is analyzed theoretically. The results show that after 100 cycles, the properties of PCMs decrease in different amplitude, and the thermal conductivity decreases with the increase of nano-copper content. The subcooling degree of Alginate was lower than that of unadded copper on the whole, and with the increase of cycle times, the whole decrease of latent calorific value in the later period was increased.
【作者单位】：上海海事大学蓄冷技术研究所;
【分类号】：TB30

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