关键词: 5 mm换热器, 翅片优化, 关联式, CFD, NSGA-Ⅱ

Abstract: Traditional simulation and experimental trial-and-error methods fall short in meeting the current demands for maximizing both performance and minimizing cost in heat exchangers. This necessitates finding a single, optimal fin dimension scheme within a reasonable range. Employs CFD simulation combined with the NSGA-II optimization algorithm to optimize the fin design of a 5 mm tube-fin heat exchanger. The redesigned 5 mm tube-fin heat exchanger achieves equivalent heat transfer capacity to the 7 mm fin version, with a 23.4% reduction in cost. Based on simulation analysis, for any target heat transfer requirement, there exists a minimum cost solution with corresponding unique optimal tube spacing and optimal fin width dimensions. Experimental testing of the 5 mm fin tube heat exchanger showed that the design deviation for heat transfer capacity is around 2%. By establishing correlation formulas linking the heat transfer capacity to the optimal tube spacing and fin width, the optimal fin dimensions can be rapidly determined. The approach avoids repeated simulation and experimentation, shortens the design cycle, and simultaneously achieves the optimal design solution.

Key words: 5 mm tube-fin heat exchanger, Fin geometry optimization, Predictive correlation, CFD, NSGA-Ⅱ