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首页> 外文期刊>Journal of Heat Transfer >Detailed Design Optimization of Three-Fluid Parallel-Flow Plate-Fin Heat Exchanger Using Second Law Analysis
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Detailed Design Optimization of Three-Fluid Parallel-Flow Plate-Fin Heat Exchanger Using Second Law Analysis

机译：使用第二法律分析的三流行平行流动板翅片热交换器的详细设计优化

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摘要

Compact parallel-flow three-fluid heat exchanger (TFHX) of plate-fin type is optimized for attaining the minimum entropy generation unit. Four different types of plate-fins (plain rectangular, offset strip, corrugated louvered, and wavy fin (WF)) which are embodied within heat exchanger have been selected for the study under both cocurrent and countercurrent flow arrangements. The range of the decision variables are 0.3 ≤ m_a,m_b,m_c≤ 3, 0.1 ≤ Ø ≤ 0.95, 0.1 ≤ L_x, L_y ≤ 2, 0.015 ≤ H ≤ 0.033, 100 ≤ n ≤ 700, 0.0001 ≤ t_f ≤ 0.0002, 0.001 ≤ l ≤ 0.009, 0.01 ≤ L_(wav) ≤ 0.09, and 0.001 ≤ A ≤ 0.005. Genetic algorithm is selected as an optimization tool that is apt in handling various continuous and discrete variables and the problems with the complexities in the objective function as well as in constraints. Validation of the optimization model is carried out by comparing the optimum results with that obtained from the experiments, particle swarm optimization (PSO) (under without heat duty constraint), and graphical method (under with heat duty constraint). It is observed that for a specified heat duty (180 kW) and given operating conditions, corrugated louvered fin (CLF) with countercurrent flow arrangement offers the minimum entropy generation among all. It is riveting to learn that the optimum results occur for most of the considered cases when the flowrate of the central hot fluid is lower than that of the adjacent fluids. At fixed Re = 3000 for all the fin types, off-set strip fin is the most favorable one, and plain rectangular fin (PRF) offers the worst solution comparatively.
机译：结构紧凑的平行流量三流体热交换器（TFHX）的板式翅片型以获得最小熵生成单元。已经选择了在COCOCRENT和逆流流动布置下的研究中实施在热交换器内的四种不同类型的板鳍（普通矩形，偏移条，波纹丝网和波浪翅片（WF））。判定变量的范围为0.3≤m_a，m_b，m_c≤3,0.1≤ø≤0.95,0.1≤L_x，l_y≤2,0.015≤h≤0.033,100≤n≤700,0.0001≤t_f≤0.0002,0.001 ≤1≤009,0.01≤L_（WAV）≤0.09，0.001≤A≤0.005。选择遗传算法作为优化工具，即用于处理各种连续和离散变量以及目标函数中的复杂性以及约束的问题。通过比较从实验中获得的最佳结果，粒子群优化（PSO）（不含热占限制）和图形方法（在具有热量约束下）来进行优化模型的验证。观察到，对于指定的热占定义（180kW）和给定的操作条件，具有逆流流动装置的瓦楞宽鳍片（CLF）提供了最小的熵生成。为了了解中央热流体的流量低于相邻流体的流动性，以了解最佳结果是针对大多数所考虑的情况而发生的最佳结果。在固定的RE = 3000对于所有鳍片类型，偏离设定的带鳍是最有利的，普通的矩形鳍（PRF）相对较好地提供最糟糕的解决方案。

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