R410A/R404A/R407C在T型翅内螺纹水平管外的降膜蒸发换热研究  

Experimental Study of Falling Film Evaporation Heat Transfer Performance of R410A,R404A and R407C in Horizontal T Type Fin Inner Thread Tube

作　　者：苏肖雅 欧阳新萍[1] SU Xiao-ya;OUYANG Xin-ping(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai China,Post Code :200093)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《热能动力工程》2019年第2期88-93,共6页Journal of Engineering for Thermal Energy and Power

摘　　要：为分析R410A、R404A、R407C在T型翅内螺纹水平强化管外降膜蒸发的换热特性,分别在变喷淋密度(0. 047～0. 113 kg/(m·s))、变蒸发温度(0～16℃)以及变热流密度(10～40 k W/m^2)条件下进行了实验,采用"Wilson"图解法以及热阻分离法进行实验数据处理,得到了3种制冷工质在管外降膜蒸发时的换热特性。结果表明:随着喷淋密度的增加,R410A、R404A和R407C 3种制冷工质的管外降膜蒸发传热系数先增加后减少,存在最佳喷淋密度,分别为0. 092、0. 088和0. 095 kg/(m·s);随着蒸发温度的升高,R410A和R404A的管外降膜蒸发传热系数先减小后增大,而R407C的管外降膜蒸发传热系数则一直在增大,但均小于R410A和R404A;随着热流密度的增加,3种制冷工质的管外降膜蒸发传热系数也随之增大,其中,R410A的换热性能最好,R404A次之,R407C最差。通过传热分析以及实验数据拟合,得到了3种制冷剂的降膜蒸发传热关联式。An experimental study was conducted to analyze the heat transfer characteristics of falling film evaporation on the horizontal T type fin inner thread tube with R410 A/R404 A/R407 C. Experiments were performed on the conditions of the spray density from 0. 047 to 0. 113 kg/( m·s),evaporation temperature from 0 to 16 ℃,and the heat fluxes from 10 to 40 k W/m2. The experimental data was analyzed by using the Wilson plot method and the separation of thermal resistance. The results indicated that with the increase of the spray density,the heat transfer coefficient outside the horizontal tube with all three kinds of refrigerants increased first and then decreased. The optimum spray density of those three refrigerants was0. 092,0. 088 and 0. 095 kg/( m·s),respectively. With the increase of the evaporation temperature,the heat transfer coefficient of R410 A and R404 A decreased first and then increased while the heat transfer coefficient of R407 C was increasing continuously and lower than R410 A and R404 A. The heat transfer coefficients of three refrigerants also increased with increase in heat flux. Among them,R410 A has the best heat transfer performance,R404 A is the second,and R407 C is the worst. New hear transfer correlations of three refrigerants were obtained on the basis of heat and mass transfer analogy and experimental data.

关 键 词：降膜蒸发 强化管 强化换热 传热关联式 

分 类 号：TB657.5[一般工业技术—制冷工程]