小管径铜管内含油制冷剂流动冷凝换热与压降特性的实验研究  

Experimental Investigation on the Heat Transfer and Pressure Drop Characteristics of Refrigerant-oil Mixture Flow Condensation inside Small Diameter Copper Tubes

作　　者：胡海涛[1] 丁国良[1] 黄翔超[1] 朱禹[1] 高屹峰[2] 郑永新[2] 宋吉[2] 

机构地区：[1]上海交通大学制冷与低温工程研究所,上海200240 [2]国际铜业协会(中国)上海代表处,上海200020

出　　处：《制冷技术》2012年第2期10-14,共5页Chinese Journal of Refrigeration Technology

摘　　要：实验研究了小管径铜管内R410A-油混合物的流动冷凝换热与压降特性。测试管为外径为5mm的光管和强化管。实验结果表明,润滑油的存在总是恶化5mm光管和强化管内的换热特性,最大分别恶化24.8%和25.1%。润滑油的存在对光管和强化管内的冷凝压降影响不同。对于光管,润滑油总是降低冷凝压降,最大降低19%。对于强化管,干度小于0.6时,润滑油的存在降低强化管内的压降,最大降低18%;干度大于0.6时,润滑油的存在增大强化管内的压降,最大增强9%。相同工况下,5mm强化管与光管相比,换热系数增大60%～130%、压降增大40%～65%。The heat transfer and pressure drop characteristics of R410A-oil mixture flow condensation inside small diameter copper tubes are performed experimentally. The test tubes include a smooth tube and a microfin tube, the diameters of which are both 5 mm. The test results show that, the presence of oil always deteriorates the heat transfer for smooth and microfin tubes, and the deterioration effects for smooth tube and microfin tube are 24.8% and 25.1%, respectively. The effects of oil on pressure drop are different for smooth tube and microfin tube. For the smooth tube, the present of oil always decrease the pressure drop, and the maximum of the decreasement effect is 19%. While for the microfin tube, when the vapor quality is smaller than 0.6, the presence of oil decreases the pressure drop by a maximum of 18%; when the vapor quality is larger than 0.6, the presence of oil increases the pressure drop by a maximum of 9%. Comparing with 5 mm smooth tube, the heat transfer coefficient and pressure drop of R410A-oil mixture flow condensation in 5 mm microfin tube increases by 60%-130% and 40%-65%, respectively, due to the presence of microfins.

关 键 词：小管径铜管 R410A 油 冷凝 换热 压降 

分 类 号：TK124[动力工程及工程热物理—工程热物理]