制冷学报2018，Vol.39Issue(2)：126-134,9.DOI:10.3969/j.issn.0253-4339.2018.02.126
R134a在微肋管内的冷凝换热特性
Heat Transfer Characteristics during Condensation of R134a inside Micro-fin Tubes
摘要
Abstract
Experimental study of R134a during condensation heat transfer inside the micro-fin tube for the condensation temperatures of 35 ℃ 、40 ℃ and 45 ℃ was made.The mass flux,condensation temperature,structural parameters of micro-fin tube were chosen as influencing factors and the total heat transfer coefficient,water-testing heat transfer coefficient,refrigerant surface heat transfer coefficient and pressure drop were selected as evaluation indexes.Experimental results show that:the total heat transfer coefficient,refrigerant surface heat transfer coefficient and pressure drop increase with increasing mass flux,and decreasing condensation temperature and tube diameter,but the water-testing heat transfer coefficient slightly decreases with increasing mass flux and the condensation temperature has a small influence on it.The thermal resistance analysis shows that the water-testing thermal resistance increases and refrigerant thermal resistance decreases with increasing mass flux,and the refrigerant thermal resistance is always less than the water-testing thermal resistance.To evaluate the comprehensive performance of micro-fin tubes,the ratio of refrigerant surface heat transfer coefficient and pressure drop (the surface heat transfer coefficient of unit pressure drop) was proposed,results show the ratio decreases first and then increases with the increase of the mass flux,and increases with decreasing condensation temperature and tube diameter in the micro-fin tubes.关键词
冷凝/内螺旋管/热阻分析/单位压降表面传热系数Key words
condensation/micro-fin tubes/the thermal resistance analysis/the surface heat transfer coefficient of unit pressure drop分类
通用工业技术引用本文复制引用
李庆普,陶乐仁,吴生礼,李垒,胡永攀..R134a在微肋管内的冷凝换热特性[J].制冷学报,2018,39(2):126-134,9.基金项目
本文受上海市动力工程多相流动与传热重点实验室开放基金(13DZ2260900)资助.The project was provided by the Opening Project of Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering(No.13DZ2260900). （13DZ2260900）
