圆管内R290-POE油溶液的沸腾换热特性研究  

Study on Boiling Heat Transfer Characteristics of R290-POE Oil Solution in Circular Tubes

作　　者：赵鑫 蔡德华[1] 邓佳驹 高宇 何国庚[1] ZHAO Xin;CAI Dehua;DENG Jiaju;GAO Yu;HE Guogeng(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China)

机构地区：[1]华中科技大学能源与动力工程学院

出　　处：《制冷技术》2019年第6期31-36,共6页Chinese Journal of Refrigeration Technology

基　　金：国家自然科学基金（No.51706077）;深圳市创新基础研究（No.JCYJ20170307155844701）

摘　　要：制冷工质对的特性直接影响吸收式制冷机的性能。本文以R290-POE油溶液为工质对,通过实验测量溶液的沸腾换热表面传热系数,分析热流密度、质量流速和圆管管径对沸腾换热性能的影响。实验工况设置制冷剂质量浓度为11%,沸腾温度为62.5℃,质量流速为221~332 kg/(m^2·s)。结果表明,沸腾换热表面传热系数随热流密度、质量流速和圆管管径的增大而增大,核沸腾机理起主要作用,对流沸腾机理也有积极意义。蒸气质量与热流密度呈正相关,当管径为4 mm、质量流速为221 kg/(m^2·s)时,沸腾换热表面传热系数和蒸气质量随热流密度的变化最大。6 mm圆管的沸腾换热表面传热系数比4 mm圆管的大。The performance of the absorption refrigerator is directly affected by the properties of refrigeration working pair.The boiling heat transfer coefficient of the R290-POE oil solution is measured experimentally,and the effects of heat flux,mass flux and circular tube diameter on the boiling heat transfer performance are analyzed.In the experimental conditions,the refrigerant concentration is 11%,the boiling temperature is 62.5℃,and the mass flux is 221-332 kg/(m^2·s).The results show that the boiling heat transfer coefficient increases with the increases of heat flux,mass flux and tube diameter.The nuclear boiling mechanism plays a major role,and the convection boiling mechanism also has positive significance.The vapor quality is positively correlated with the heat flux.When the tube diameter is 4 mm and the mass flux is 221 kg/(m^2·s),the changes of boiling heat transfer coefficient and vapor quality with heat flux are the largest.The boiling heat transfer coefficient of 6 mm tube is larger than that of 4 mm tube.

关 键 词：吸收式制冷 R290-POE油溶液 水平管 沸腾换热 

分 类 号：TB611[一般工业技术—制冷工程]