具有蒸气过热的R-134a在螺旋管内凝结换热的实验研究  

Condensation Heat Transfer Characteristics of R - 134a with Vapor Superheat in a Helical Pipe

作　　者：韩吉田[1] 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 Florida International University

出　　处：《制冷学报》2005年第3期6-11,共6页Journal of Refrigeration

基　　金：国家自然科学基金资助项目(50376030)

摘　　要：对具有蒸气过热的替代制冷剂R-134a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-134a的质量流量变化范围为100(400kg/(m2s)和蒸气过热度为3.8℃和8.4℃的条件下,得到了螺旋管内具有蒸气过热的R-134a对流凝结换热特性的实验数据。实验结果表明,蒸气过热对R-134a在螺旋管内的凝结换热特性具有明显的影响。通过与已有研究结果的比较,简要分析了蒸气过热对R-134a在螺旋管内凝结换热特性的影响机理。Experimental investigation was conducted on condensation heat transfer characteristics of alternative refrigerant R - 134a with vapor superheat in a helical pipe. The average condensation heat transfer coefficients were experimentally determined for R- 134a in a helical pipe with the superheat of inlet vapor ranging from 3.8℃ to 8.4℃. The mass flux for R- 134a ranges from 100 to 400 kg/（m^2s）. The experimental results show that the vapor superheat has significant effect on the condensation heat transfer characteristics of R- 134a in helical pipes. In addition, the mechanism of the effect of vapor superheat on convective condensation heat transfer of R - 134a in helical pipes was briefly analyzed through comparison of the obtained experimental results with the data in the open literature.

关 键 词：工程热物理 对流凝结换热 替代制冷剂 螺旋管 过热蒸气 R-134A 实验数据 凝结换热 过热度 蒸气 

分 类 号：TB64[一般工业技术—制冷工程] TK124[动力工程及工程热物理—工程热物理]