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Second Law Analysis of Heat Exchangers

机译：换热器第二定律分析

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This paper further explores the topic of an ideal heat exchanger, which is still an open question. It is shown that the minimization of entropy production or exergy destruction should not be an objective in heat exchanger design. It is further proven that heat exchanger effectiveness does not correlate with irreversibility. A new performance measure, entropy flux, is introduced and a general expression for its evaluation is presented. It is shown that entropy flux captures many desirable attributes of heat exchangers. For a given effectiveness, a single stream heat exchanger has the absolute maximum entropy flux, and for capacity ratios greater than zero, counterflow has the highest entropy flux, parallel flow the lowest, and the shell and tube heat exchangers are somewhere in between.
机译：本文进一步探讨了理想热交换器的话题，这仍然是一个悬而未决的问题。结果表明，在热交换器设计中，最小化熵产生或火用破坏不应成为目标。进一步证明，热交换器的有效性与不可逆性无关。介绍了一种新的性能指标熵通量，并给出了其评估的一般表达式。结果表明，熵通量捕获了热交换器的许多理想属性。对于给定的效率，单流换热器具有绝对最大的熵通量，而对于容量比大于零，逆流具有最大的熵通量，平行流具有最低的熵通量，而管壳式换热器介于两者之间。

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