基于氨水工质的管壳式冷凝器多目标构形优化

Multi-objective Constructal Optimization of a Shell-and-tube Condenser With Ammonia-water Working Fluid

应用构形理论,以换热过程[火积]耗散率和总泵功率组成的线性加权复合函数为优化目标,首先在总换热率和换热面积一定的条件下,对基于氨水工质的管壳式冷凝器进行构形优化,得到一次最小复合函数以及对应的一次最佳换热管外径,并进一步分析氨水浓度、冷却水进口温度、冷凝器换热面积和总换热率对一次构形优化结果的影响。

On the basis of constructal theory,constructal optimization of a shell-and-tube condenser with ammonia-water working fluid is conducted in this paper.A complex function composed of linear weighted sum of entransy dissipation rate in heat transfer process and total pumping power is taken as optimization objective.Firstly,taking the total heat transfer rate and heat transfer area.of the tubes as the constraints,the complex function is primarily minimized,and the corresponding optimal external diameter of the heat transfer tube is obtained.Then the effects of the ammonia concentration,inlet temperature of cooling water,heat transfer area and total heat transfer rate on the primary constructal design results are analyzed.