摘要
为了建立无润滑油的实验台,采用液压隔膜泵为动力循环,以R410A和R22为工质在水平内螺纹铜管(φ5mm和φ9.52mm)中进行了沸腾换热实验研究,并对二者沸腾换热性能做了对比。分析讨论了制冷剂质量流速、管外水流量变化、强化管的管径对压降和换热系数影响。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管径的换热系数是5mm的1.32～7.22倍,5mm管径的压降是9.52mm管径的1.48～2.68倍。
In order to establish test-bench without oil,hydraulic diaphragm pumps are used for the power cycle in this study.The boiling heat transfer of environmentally friendly refrigerant R410A and R22 as working fluids in the horizontal and inner-grooved copper tubes（φ5mm and φ9.52mm） were investigated experimentally,and the boiling heat transfer performance of the two refrigerant was compared.The effect of refrigerant mass flow rate,changes of,external water flow rate and diameter of tubes on the pressure drop and heat transfer coefficient are analyzed.Experimental results show that heat transfer coefficient increases with the increase of water flow rate,and the size of diameter has greater impact on the heat transfer coefficient.In the same flow rate,heat transfer coefficient of the 9.52mm tube is 1.32～7.22 times as the 5mm tube.
出处
《制冷学报》
CAS
CSCD
北大核心
2011年第4期20-24,共5页
Journal of Refrigeration
基金
国家高技术研究发展计划(863计划
2008AA05Z204)资助项目~~
关键词
工程热物理
R410A
内螺纹铜管
沸腾换热
性能
实验研究
Engineering thermophysics
R410A
Inner-grooved copper tube
Boiling heat transfer
Performance
Experimental study
