R32在水平强化管内的流动沸腾换热特性研究  

Study on the Convective Heat Transfer of R32 inside Horizontal Enhanced Tubes

作　　者：张丹亭 陶乐仁[1] 李庆普[1] 毛舒适 ZHANG Dan-ting;TAO Le-ren;LI Qing-pu;MAO Shu-shi(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai,China,Post Code:200093)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《热能动力工程》2019年第3期97-102,133,共7页Journal of Engineering for Thermal Energy and Power

基　　金：上海市重点实验室资助项目(1N-15-301-101)~~

摘　　要：为研究制冷剂在内螺纹管内的换热情况,搭建集蒸发冷凝性能测试于一体的实验台,研究了替代工质R32在水平内螺纹管内的流动沸腾换热特性和压降特性。实验测试管外径分别为7和8 mm,进口过冷度和出口过热度为3～5℃,制冷剂质流密度为300～700 kg/(m^2·s),饱和温度保持在5～10℃,实验段水侧雷诺数为12 000～20 000,热平衡误差保持在5%以内。结果表明:制冷剂侧表面换热系数随制冷剂质流密度的增大而增大,随饱和温度的增大而减小,而水侧雷诺数Re对其并无影响;总传热系数随制冷剂质流密度、水侧雷诺数Re的增大而增大,随饱和温度的增大而减小;试验段压降随制冷剂质流密度的增大而增大,随饱和温度的增大而减小,水侧雷诺数对其无影响;在相同工况下,7 mm管比8 mm管的制冷剂侧换热系数以及总传热系数都大,但是其压降也比8 mm管大。In order to study the heat transfer in microfin-tubes of the refrigerant,an experimental rig was set up to test the evaporation and condensation performances,with the goal of studying the characteristic of convection heat transfer and pressure drop of R32 inside horizontal enhanced tubes.Following are the experimental conditions: external diameters of the test tubes were 7 mm and 8 mm,the inlet supercooling and the outlet overheat were kept at 3~5 C,refrigerant mass flow was kept at 300~700 kg/(m^2·s),evaporation temperature was kept at 5~10℃,Reynolds number of water was kept at 12 000~20 000,and heat balance error was kept at 5%.The results showed that the refrigerant side heat transfer coefficient would be increased with the increase of refrigerant mass flow,decreased with the increase of saturation temperature,and there was no effect by the water Reynolds number at tube side.The total heat transfer coefficient would be increased with the increase of mass flow and water Reynolds number,and decreased with the increase of saturation temperature.The pressure drop of the test tube would be increased with the increase of mass flow,decreased with the increase of saturation temperature,and there was no effect by the water Reynolds number at tube side.For a same operating condition,the refrigerant side heat transfer coefficient and total heat transfer coefficient of 7 mm tube are larger than those of 8 mm tube,but the pressure drop is also larger than that of 8 mm tube.

关 键 词：内螺纹强化管 流动沸腾换热 R32制冷剂 单管 强化换热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]