基于微通道换热器重力型分离式热管传热性能实验研究
首发时间:2018-01-19
摘要:以R134a为工质实验研究了基于微通道换热器的重力型分离式热管的换热能力,分析了在不同换热器高度差下,微通道型分离式热管的换热性能随充液率、温差、风速、启动时间的变化关系。结果表明,最佳充液率范围在各个高度差下均适用;换热量随高度差的升高而增加,在小温差下,高度差对系统换热性能影响更为显著,温差为5K时,高度差从500mm上升到1300mm,换热性能提升了77%;单体当量换热系数随蒸发段与冷凝段进风温差的升高而增加,高度差为900mm时,单体当量换热系数在20K温差比5K温差高出79.1%;当风速从2m/s上升到4m/s时,系统传热性能提升了167%;高度差从1300mm下降到700mm时,系统启动达到稳定运行的时间增加33%。
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Experimental investigation on heat transfer of separate gravity heat pipe with microchannel heat exchangers
Abstract:Heat transfer performance of separate gravity heat pipe with microchannel heat exchangers was studied experimentally with different filling ratio, temperature difference, wind velocity and start-up time under different height differences, using R134a as working fluid. The result showed that the same optimal filling ratio was applicable at all height differences. The heat transfer of system was increased with the increase of height difference especially under lowtemperature difference. When the height difference was changed from 500mm to 1300mm, the heat transfer performance increased 77% under 5K temperature difference. The unit equivalent heat transfer coefficient would also increase with the rise of thetemperature difference of inlet air between the evaporator and the condenser. When the temperature difference rose from 5K to 20K, the unit equivalent heat transfer coefficient increased 79.1% under 900mm height difference. Heat transfer coefficient grew 167% when wind velocity was increased from 2m/s to 4m/s. When height difference dropped from 1300mm to 700mm, the start-up time of system increased 33%.
Keywords: Refrigeraton Microchannel Separate heat pipe Heat transfer Height difference
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基于微通道换热器重力型分离式热管传热性能实验研究
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