摘要
实验研究了环保替代制冷工质R410A、R22在水平强化管内冷凝换热特性,探索了热流密度、水流速度对换热特性、压降的影响。实验测试管为内螺纹强化管,长度为5.2 m,外径为9.52 mm。实验结果表明:制冷剂R410A、R22的传热系数和压降随热流密度的增大而增大,同时内螺纹管的换热系数还随管外冷却水流量的增加而升高,压降随冷凝温度的升高而降低,而R410A比R22有更好的换热效率和较小的压降。
Experimental study of condensation heat transfer of R410A and R22 outside horizontal tubes is performed to investigate the influence of heat flux and flow velocity on condensation heat transfer and pressure drop. The test tube is internally spiral grooved tube, the length of the test tube is 5.2 m, and the outside diameter is 9.52 mm. The results show that heat transfer coefficient and pressure drop of R410A and R22 are increasing while heat flux is increasing, at the same time heat transfer coefficient of internally spiral grooved tube is increasing while flux of cooling water outside is increasing, and pressure drop is decreasing while temperature is increasing. And R410A has the higher heat transfer coefficient and lower pressure drop than R22.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2010年第12期2113-2116,共4页
Journal of Engineering Thermophysics
基金
国家高技术研究发展计划项目(No.2008AA05Z204)
关键词
R410A
R22
冷凝
强化管
压降
R410A
R22
condensation
horizontal enhanced tubes
pressure drop
