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科学通报  2012 

间接蒸发冷却系统传热传质性能的优化准则

DOI: 10.1360/csb2012-57-1-88, PP. 88-94

Keywords: 间接蒸发冷却,优化准则,(火积)耗散热阻,(火用)效率

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Abstract:

蒸发冷却技术的广泛应用对节能减排有重大意义,其传热传质过程的性能优化准则是改善蒸发冷却性能的理论基础.采用火用分析法以及耗散热阻分析法对间接蒸发冷却系统性能优化的流量分配和面积分配问题进行了研究,建立了典型间接蒸发冷却循环制冷量与火用效率及耗散热阻之间的关系,并用数值方法在给定入口参数、传热传质参数以及循环流量的前提下,分别改变流量分配系数和面积分配系数,验证了当循环制冷量取最大值时,耗散热阻均取极小值但火用效率并不为极大值.这说明耗散热阻,而非火用效率,才是表征间接蒸发冷却系统冷却性能的物理量,并且耗散热阻分析法更适合评价和分析间接蒸发冷却系统.

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