R410A在水平内螺纹管中沸腾换热实验研究  

Evaporation heat transfer of R410A flowing inside horizontal smooth and internally grooved tubes

作　　者：张建国[1] 陶乐仁[1] 王金锋[1] 王伟[1] 

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：《低温与超导》2009年第12期42-46,共5页Cryogenics and Superconductivity

摘　　要：对于非共沸混合制冷剂R410A在外径9．52mm、5mm的两种不同的几何参数的内螺纹的流动沸腾换热进行了实验研究，分析讨论了制冷剂质量流速、管外水流量变化、强化管的参数、强化管的压降对换热系数影响以及其机理。试验的结果表明：换热系数随着流量的增大而增大，管径的大小对换热系数的影响较大，在相同的流量下，9．52mm的换热系数比5mm的大到110％～230％，5mm管的压降比9．52mm的大200％～300％。The experimental study was carried out on the evaporation heat transfer of non,- azeotropie refrigerant mixtures R410A flowing inside two internally grooved tubes of 9.52mm ,5mm with different geometrical .parameters. The influence and mechanism of mass flow rate , changes in external water flow pipe , geometrical parameters and the pressure drop of： enhanced tubes on heat transfer coefficients were analyzed and discussed. Experimental results indicate that the heat transfer coefficient in- creases with the increasing flow, under the same flow, the heat transfer coefficient of 9.52mm tubes is larger 110‰～ 230‰ than 5ram tubes , the large pressure drop of 5mm tubes is larger than 5mm between 200 % and 300%.

关 键 词：非共沸混合制冷剂 R410A 沸腾换热 内螺纹管 

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]