R134a在螺纹管内冷凝换热及压降特性  

Condensation Heat Transfer and Pressure Drop Performance of R134a in Inner-Grooved Tubes

作　　者：毛舒适 陶乐仁[1] 李庆普[1] 吴生礼 张丹亭 MAO Shushi,TAO Leren,LI Qingpu,WU Shengli,ZHANG Danting(School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, Chin)

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：《轻工机械》2018年第2期25-30,35,共7页Light Industry Machinery

基　　金：上海市动力工程多相流动与传热重点实验室开放基金项目(13DZ2260900)

摘　　要：为了研究冷凝温度和管径对3种内螺纹管内制冷剂R134a流动换热系数和压降的影响,对3根不同管径的内螺纹管(6.35,7.00和8.00 mm)在不同冷凝温度下(35,40和45℃)进行了冷凝实验。探究了冷凝温度、螺纹管直径和质流密度对换热特性及压降的影响。实验结果表明:冷凝温度越低,制冷剂侧传热系数越高,压降也越大。6.35 mm管的制冷剂侧传热系数最大,压降也最大,但单位压降冷凝传热系数μ(μ=h_r/ΔP)最高,综合性能最佳。To investigate the effects of condensation temperature and diameter of inner-grooved tubes on flow evaporation and condensation performance of R134a, three kinds of inner-grooved tubes with different diameter （6. 35, 7. 00 and 8. 00 mm） were tested at different condensing temperatures （35, 40 and 45℃）. The effects of condensation temperature, diameter and mass flow rate on heat transfer characteristics and pressure drop were investigated. The experimental results show that： the lower the condensation temperature, the higher the heat transfer coefficient of the refrigerant side and the greater the pressure drop. The tube with diameter of 6. 35 mm has the greatest heat transfer coefficient of the refrigerant side and the greatest pressure drop. However, it has the greatest condensation heat transfer coefficient per unit drop（μ =h/△P） and the best comprehensive performance.

关 键 词：换热器 螺纹管 换热系数 压降 冷凝温度 

分 类 号：TK124[动力工程及工程热物理—工程热物理]