组合式翅片管换热器传热与阻力性能影响因素研究

Study on Optimization of Fin Shape Matching of Combined Finned Tube Heat Exchanger

为解决空气源热泵冬季在制热工况下因室外机内翅片换热器换热效率低引起系统供能性能下降的问题,以组合式翅片管换热器为研究对象,在模化实验的基础上,采用数值模拟的方法分别对翅片换热器的传热及流阻性能影响因素进行分析。研究结果表明:在本文研究背景下,入口风速、翅片厚度、开缝数目对前开孔后开缝型的翅片组合形式换热器传热效率具有一定程度的影响;以上述三种因素为目标函数对换热器进行多目标优化时,入口风速取3 m/s,翅片厚度为0.16 mm,后排开缝数目为6,换热器能得到较好的综合性能;在此基础上,拟合出适合于该组合形式的传热和流阻关联式。

In order to solve the problem of the low heat exchange efficiency of the fin heat exchanger in the outdoor unit under the heating condition of the air source heat pump in winter,the system energy supply performance is reduced.The combined fin and tube heat exchanger is used as the research object.On the basis of the experiment,the method of numerical simulation is used to analyze the factors affecting the heat transfer and flow resistance performance of the fin heat exchanger.The research results show that:under the background of this study,the inlet wind speed,fin thickness,and the number of slits have a certain degree of influence on the heat transfer efficiency of the fin combination heat exchanger with front openings and rear slits;based on the above three factors,when multi-objective optimization of the heat exchanger is performed for the objective function,the inlet wind speed is 3m/s,the fin thickness is 0.16 mm,and the number of slits in the rear row is 6,the heat exchanger can get better overall performance;on this basis,the heat transfer and flow resistance correlation equations are suitable for the combined form.