扁管和百叶窗式微通道换热器空气侧阻力的实验研究

Experimental Study of the Air Resistance of Microchannel Heat Exchanger with Flat Tube and Louver Fin

在迎面风速1—4m／s、雷诺数100—500，迎风面尺寸600mm×550mm以及环境温度20℃工况条件下，测试了微通道换热器空气侧阻力，对比分析了测试结果与不同关联式计算结果，表明现有不同关联式问预测结果相差较大，其中Davenport的关联式与实验值较为接近，但实验值也仅有其预测值的55％～66％。实验也表明微通道换热器空气阻力与换热量和迎风面积相同的平翅片圆管换热器空气阻力相当，认为独特的扁管结构和较小的换热器厚度是其减小空气阻力的有效手段。

An experimental study on the air-side resistance characteristics for micro channel heat exchanger has been performed. A series of tests were conducted at a constant surrounding temperature of 20℃ for the air velocity of 1-4m/s, Reynolds numbers of 100-500 and surface dimension of 600ram x550mm. The data were compared with different general correlations. The results show that there is a big difference between different correlations. Davenport＇ s predication is the best one, but the experimental data was only 55%-66% of pre dicted result. The data were compared with the plain fin and round tube heat exchanger with same surface dimension and capacity. The re suits show that they are near. The flat tube and lesser depth are two effective ways to reduce the air resistance.