R-134a在三种不同放置方式螺旋管内凝结换热的实验研究  

Experimental Investigation of Condensation Heat Transfer of R-134a ina Helical Pipe at Three Different Orientations

作　　者：韩吉田[1] B.Yu H.J.Kang C.X.Lin M.A.Ebadian 

机构地区：[1]山东大学能源与动力工程学院,济南250061 [2]Hemispheric Center for Environmental Technology

出　　处：《制冷学报》2004年第2期1-6,共6页Journal of Refrigeration

基　　金：国家自然科学基金资助项目 ( 5 0 3 760 3 0 )

摘　　要：对替代制冷剂R - 1 34a在螺旋管内的对流凝结换热特性进行了实验研究。在制冷剂R - 1 34a的质量流量变化范围为 1 0 0～ 4 0 0kg/ (m2 s)和冷却水的平均温度分别为 1 2℃和 2 2℃的条件下 ,实验得到了在三种不同放置方式螺旋管内 (水平 ,垂直和倾斜 )R - 1 34a的对流凝结换热特性数据。实验结果表明 ,螺旋管的不同放置方式对R - 1 34a在螺旋管内的凝结换热特性具有重要的影响。通过与已有研究结果的比较 ,简要分析了螺旋管不同放置方式对R -1This paper presents experimental investigation on convective condensation heat transfer characteristics of alternative refrigerant R-134a in a helical pipe. The average condensation heat transfer coefficients were experimentally determined for R-134a at three different orientations (i.e., horizontal, vertical, and inclined orientation directions). The mass flux for R-134a ranges from 100 to 400 kg/(m2s) and the average temperatures of the cooling water are 12℃ and 22℃, respectively. The experimental results demonstrate that the different orientations of helical pipes have significant effect on the condensation heat transfer characteristics of R-134a . In addition, the mechanism of the effect of different orientations of helical pipes on convective condensation heat transfer is briefly analyzed by comparing with prevenient results.

关 键 词：制冷剂 R-134A 对流凝结换热 替代制冷剂 螺旋管 相变传热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]