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化工学报  2013 

组合式相变材料最佳相变温度的热力学分析

DOI: 10.3969/j.issn.0438-1157.2013.07.003, PP. 2322-2327

Keywords: 组合式相变材料,蓄能,最佳相变温度,有效能

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Abstract:

采用组合式相变材料的蓄热系统较单一相变材料具有更为优越的传热和热力学性能,而相变温度对于蓄热系统性能具有重要的影响。为了使结果更具普适性,以热力学有效能分析为基础并忽略具体换热器形式和传热过程,推导了使用不同相变材料数时每种相变材料最佳相变温度的理论公式,并根据最佳相变温度计算了有效能利用率随着相变材料数的变化,结果表明当PCMs数增加到4种时,理论最大有效能利用率已达80%以上,比使用单一相变材料的理论最大有效能利用率高50%左右。以573.15K热能蓄能为例,计算了使用1~4种相变材料时相应的最佳相变温度与最大有效能利用率,并以此为依据给出了实际最佳相变材料组合。

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