A marine boiler model composed of the major heat transfer components of evaporator, superheater and economizer is built in this paper. Constructal design for the marine boiler is performed based on the minimization of weighted sum function composed of entropy generation rate and power consumption. It reveals that the triple minimum weighted sum function can be gained by changing the dimensionless tube outer diameters of the evaporator, superheater and economizer. The weighted sum function of the marine boiler is reduced by 25.9% after triple minimizations, and its overall performance is evidently elevated. The multi-objective optimization considering the entropy generation rate and power consumption is further conducted by using NSGA-II, and the Pareto optimal set of the two performance indexes is gained. By using three decision methods to evaluate the Pareto optimal set, the deviation index of the LINMAP decision method is the smallest one. Therefore, the optimal structure obtained by LINMAP decision method is recommended in the marine boiler designs, which satisfies multiple design requirements for the practical boilers.

中文翻译：

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考虑熵产率和功耗的船用锅炉多目标结构设计

建立了由蒸发器、过热器和省煤器等主要传热部件组成的船用锅炉模型。船用锅炉的结构设计是基于熵产生率和功耗组成的加权和函数的最小化进行的。揭示了通过改变蒸发器、过热器和省煤器的无量纲管外径可以获得三重最小加权和函数。经过三重最小化后，船用锅炉的加权和函数降低了25.9%，整体性能明显提高。利用NSGA-II进一步进行考虑熵产生率和功耗的多目标优化，得到两个性能指标的Pareto最优集。通过使用三种决策方法对Pareto最优集进行评估，LINMAP决策方法的偏差指数最小。因此，在船用锅炉设计中推荐采用LINMAP决策方法得到的最优结构，满足实际锅炉的多种设计要求。