The response surface method is applied to design the heat exchanger with decreasing tube diameter, for the traditional design methods are not suitable for the optimization of the performance and cost of heat exchanger simultaneously. The method fits the relationship among the tube length, fin pitch, performance and cost of heat exchanger into a quadratic continuous function that can be solved directly. The accuracy of the method is verified by applying it to the optimization of 7mm tube heat exchanger, the deviation from the experimental data is 0.3%. Using the method for the optimization of 9.52mm tube heat exchanger into 5mm tube heat exchanger, the cost and refrigeration charge of designed heat exchanger decrease by 28% and 39.8%, respectively, while the performance is unchanged.%在缩小管径后换热器的优化设计中,为了解决传统设计方法不能满足对换热器性能和成本的同时寻优求解问题,采用表面反应法对换热器进行设计.该方法将连续区间内管长和翅片间距与换热性能和成本的关系拟合成可直接求解的二次连续函数,实现了多变量连续区间内的寻优.将该方法用于7mm管换热器缩小管径的优化,其设计结果与实验数据偏差为0.3％,验证了该方法的准确性.采用验证后的设计方法,对9.52mm管换热器进行了优化设计表明,在保证热性能不变前提下,换热器管径从9.52mm缩小为5mm,换热器成本降低28.0％,制冷剂充注量减少39.8％.
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