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首页> 外文期刊>International journal of green energy >THE SECOND LAW ANALYSIS OF AN UNBALANCED CONSTRUCTAL HEAT EXCHANGER
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THE SECOND LAW ANALYSIS OF AN UNBALANCED CONSTRUCTAL HEAT EXCHANGER

机译：非平衡式建筑换热器的第二定律分析

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摘要

Based on constructal theory, entropy generation minimization, and second law efficiency, equations are formulated for tree-shaped counterflow-imbalanced heat exchanger for fully developed laminar and turbulent fluid flow. Entropy generation number, rational efficiency, and effectiveness behavior with respect to changes in number of pairing levels and different tube length-to-diameter ratios of constructal heat exchanger are analyzed analytically. Different values of capacity ratio and Reynolds number for fully developed laminar and turbulent fluid flow are considered to study the influence of pressure drop and flow imbalance irreversibilities of constructal heat exchanger. Values of tube length-to-diameter ratio and number of pairing levels of constructal heat exchanger can be obtained for lower entropy generation number and higher second law efficiency which includes both irreversibilities due heat transfer and pressure drop. The analysis reveals the improvements in the performance of constructal heat exchanger compared to conventional single-tuhe-dimensioned heat exchanger.
机译：基于构造理论，最小化熵产生和第二定律效率，为充分发展的层流和湍流流动建立了树形逆流不平衡热交换器的方程式。分析了配对级数的变化以及构造式换热器的不同管长直径比的熵产生数，合理效率和有效性行为。考虑了充分发展的层流和湍流流动的容量比和雷诺数的不同值，以研究结构热交换器的压降和流量不平衡不可逆性的影响。对于较低的熵产生数和较高的第二定律效率，可以得到管长径比和结构换热器的配对级数的值，该值包括传热和压降引起的不可逆性。分析表明，与传统的单管径换热器相比，结构式换热器的性能有所提高。

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