R407C换热器内流动沸腾换热的实验研究和理论分析  

Experimental study and theoretical analysis of R407C flow boiling heat transfer in heat exchanger

作　　者：詹国兵[1] 郭浩然 Zhan Guobing;Guo Haoran(School of Mechatronic Engineering,Xuzhou College of Industrial and Technology,Xuzhou 221140,China)

机构地区：[1]徐州工业职业技术学院机电工程学院,徐州221140

出　　处：《低温工程》2025年第1期78-86,共9页Cryogenics

基　　金：国家自然科学基金(61801198)。

摘　　要：研究了微肋管内R407C和R22的流动沸腾换热特性,采用威尔逊图解法对实验数据进行处理,主要分析实验工况、制冷剂物性、微肋管结构等变量的影响。结果表明:制冷剂R407C与R22与换热壁面之间的换热热阻均随热流密度、质流密度、干度、肋片螺旋角等的增加而减小;由于制冷剂气液相密度比的差异性,R22传热系数比与R407C的高约18.5%—21.4%。选用关联式对微肋管内R407C流动沸腾换热特性进行预测评估,并对关联式预测精度随干度、质流密度等的变化趋势进行分析。在所选关联式内,Yu and Koyama关联式表现出最佳预测效果,其平均预测误差在±6.5%以内,且干度、质流密度对其预测精度的影响相近;而对于其它关联式,干度对关联式预测精度的影响比重普遍高于质流密度。The flow boiling heat transfer characteristics of R407C and R22 in the micro-fin tube were studied and the Wilson diagram method was used to process the experimental data.Meanwhile,influences of the experimental condition,the refrigerant physical properties and the micro-fin tube structure were mainly analyzed.The results show that the heat transfer resistance between R407C/R22 and the heat transfer surface both decrease with the increase of heat flux,mass flux,vapor quality and fin helix angle.Due to the difference in the ratio of vapor-liquid phase refrigerant densities,the heat transfer coefficient of R22 is about 18.5%-21.4%higher than that of R407C.Finally,the existing correlations were used to evaluate the flow boiling heat transfer characteristics of R407C in the micro-fin tubes,and the variation trend of the correlation prediction accuracy with vapor quality and mass flux was analyzed.Among the selected correlations,the Yu and Koyama correlation shows the best prediction effect with an average prediction error of 6.5%,the influences of vapor quality and mass flux on its correlation prediction accuracy were similar.For other correlations,the influence of vapor quality on the prediction accuracy is generally higher than that of mass flux.

关 键 词：R407C 流动沸腾 干度 质流密度关联式 

分 类 号：TK124[动力工程及工程热物理—工程热物理]