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首页> 外文期刊>Journal of Heat Transfer >A Novel Equivalence Approximate Model for Second Law Based Optimization of Three-Fluid Cross-Flow Plate-Fin Heat Exchanger Using Genetic Algorithm
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A Novel Equivalence Approximate Model for Second Law Based Optimization of Three-Fluid Cross-Flow Plate-Fin Heat Exchanger Using Genetic Algorithm

机译：基于遗传算法的三流体错流板翅式换热器第二定律的等效当量近似模型

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摘要

Number of entropy generation is a significant performance evaluation factor for heat exchanger as it results in trade-off between heat transfer and pressure drop. Optimization of the three-fluid heat exchanger (3 - FHXTHORN for minimum number of entropy generation unit requires epsilon - NTU relation which is unavailable for three-fluid cross-flow heat exchanger due to various complexities involved. A new approximate methodology for the optimization is presented by proving the equivalence of 3 - FHX with a coupled two-fluid heat exchanger (2 - FHX) followed by using epsilon - NTU relationship for 2 - FHX. The experimental and numerical validation of the equivalence model is presented. Three-fluid cross-flow compact heat exchanger with offset strip fins is optimized for minimum number of entropy generation units using genetic algorithm (GA). Optimum design variables including heat distribution factor are determined for different cross-flow arrangements of 3 - FHX with heat duty and pressure drop as constraint for both even and uneven fin dimensions case in all the passages. The present complex model including large number of continuous design variables can be handled well by GA. Validation of the results is carried out by using graphical techniques and very good agreement is observed. Additionally, sensitivity of the heat exchanger dimension has also been checked on the number of entropy generation along with the pressure drop in all the three fluids.
机译：熵产生的数量是热交换器的重要性能评估因素，因为它导致了传热和压降之间的权衡。三流体热交换器（3-FHXTHORN）的优化以最小化熵产生单元的数量需要epsilon-NTU关系，这由于涉及各种复杂性而不适用于三流体错流热交换器。一种新的优化方法是通过用耦合的双流体换热器（2-FHX）证明3-FHX的等效性，然后使用2-FHX的epsilon-NTU关系，给出了等价模型的实验和数值验证。遗传算法（GA）优化了带偏移翅片翅片的紧凑型换热器，以最小化熵产生单元的数量，针对具有热负荷和压降的3-FHX的不同错流布置，确定了包括热分布系数在内的最佳设计变量作为所有通道中均匀和不均匀翅片尺寸的约束条件，目前的复杂模型包括大量连续设计变量通用航空可以很好地处理各种要素。通过使用图形技术对结果进行验证，并且观察到非常好的一致性。此外，还检查了热交换器尺寸的敏感性，以及所有三种流体中的熵产生数以及压降。

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