Entransy dissipation number and its application to heat exchanger performance evaluation
Entransy dissipation number and its application to heat exchanger performance evaluation
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DOI：
10.1007/s11434-009-0295-z
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发表时间：
2009-08
影响因子：
--
通讯作者：
Jiangfeng Guo;Lin Cheng;Mingtian Xu
中科院分区：
文献类型：
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作者：
Jiangfeng Guo;Lin Cheng;Mingtian Xu
基于表征换热能力的能量概念，建立了一种新的换热器性能评价标准——能量耗散数。分析表明，在固定热容率比的情况下，能量耗散数的减小总是能提高换热器的效率。因此，能量耗散数越小，换热器性能越好。以换热器换热单元数或热容率比表示的能量耗散数正确地反映了逆流、交叉和平行流换热器的整体性能。与基于熵产的换热器性能评价标准相比，熵耗散数具有明显的优势。此外，能量耗散数反映了流动不平衡引起的不可逆性程度。
Based on the concept of the entransy which characterizes heat transfer ability, a new heat exchanger performance evaluation criterion termed the entransy dissipation number is established. Our analysis shows that the decrease of the entransy dissipation number always increases the heat exchanger effectiveness for fixed heat capacity rate ratio. Therefore, the smaller the entransy dissipation number, the better the heat exchanger performance is. The entransy dissipation number in terms of the number of exchanger heat transfer units or heat capacity rate ratio correctly exhibits the global performance of the counter-, cross- and parallel-flow heat exchangers. In comparison with the heat exchanger performance evaluation criteria based on entropy generation, the entransy dissipation number demonstrates some distinct advantages. Furthermore, the entransy dissipation number reflects the degree of irreversibility caused by flow imbalance.