空调用5mm管翅式管换热器的翅片设计与实验研究

Configuration Design and Experimental Investigation of Fin Used in 5mm Fin-and-tube Heat Exchangers for Air Conditioner

本研究基于CFD模拟的方法设计了适用于5mm管翅式换热器的翅片结构。根据设计结果,对11个5mm管翅式换热器进行了实验测试,并根据所得实验数据,开发了能够预测5mm管翅式换热器的关联式。实验结果表明:换热量随翅片间距的增加而减小,且比7mm管或更大管径换热器更明显;翅片底部出现水桥,而在7mm管或者更大管径换热器中不曾出现。根据实验数据开发的预测5mm翅片管换热器换热性能的j因子关联式,误差在±20%以内。

Optimal louver fins suitable for 5mm diameter tubes are designed by Computational Fluid Dynamic-based method in this study.Based on the design result,a set of fin-and-tube heat exchangers with 5mm diameter tubes are tested to develop correlations to predict the performance of 5mm fin-and-tube heat exchanger. The experimental results indicated that heat transfer rate decreases with the increase of fin pitch,which is more obvious than that of fin-and-tube heat exchanger with 7mm or larger diameter tubes.The water bridge was observed at the bottom of fin in experiments;however,it did not occur on the fin with 7mm or large diameter tubes.A correlation of j factor was developed to predict the heat transfer performance of fin-and-tube heat exchanger with 5mm diameter tubes.The deviations of the proposed j correlation are within ±20%.