R134a在水平微通道内的压降特性分析
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摘要
本实验以R134a为工质,在两种不同尺寸测试管内进行流动冷凝实验,以质量流量、饱和温度、热流密度、测试管结构参数为影响因子,以压降为评价指标,旨在研究外界水力工况及测试管结构尺寸对流体流动功耗的影响。实验结果显示:压降随着干度、质量流量的增加而增加,随着饱和温度的增大而降低,随着管径的减小而增大,但热流密度对管内压降的影响并不大。
Flowing condensation experiments were carried out inside tubes with different sizes, and R134a was selected as working substance in the experiment, and mass flux, saturation temperature, heat flux and structural parameters were selected as influencing factors, and pressure drop was used as evaluation index, for the purpose of studying the influences of hydraulic conditions and structural parameters on the working fluid power consumption. The experimental results show: the pressure drop increases with the increase of vapor quality and mass flux, and with the decrease of saturation temperature and tube diameter, and heat flux has a small effect on the pressure drop.
Flowing condensation experiments were carried out inside tubes with different sizes, and R134a was selected as working substance in the experiment, and mass flux, saturation temperature, heat flux and structural parameters were selected as influencing factors, and pressure drop was used as evaluation index, for the purpose of studying the influences of hydraulic conditions and structural parameters on the working fluid power consumption. The experimental results show: the pressure drop increases with the increase of vapor quality and mass flux, and with the decrease of saturation temperature and tube diameter, and heat flux has a small effect on the pressure drop.
引文
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[12]魏义平,陶乐仁,密洁霞.R410A和R22在水平内螺纹管内冷凝性能的实验研究[J].制冷技术,2012,40(12):46-49.
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[2]张定才,刘启斌,陶文铨.R22在水平双侧强化管外的凝结换热[J].化工学报,2005,56(10):1865-1868.
[3]翁文兵,王丰霞,王俊.R134a和R417A应用于热泵热水器灌注式替代R22的实验分析[J].制冷学报,2011,32(4):43-62.
[4]刘杰,陈江平.车用空调R134a的发展现状与替代情况[J].制冷技术,2008,28(1):39-41.
[5]方贤德,周展如,施蓉蓉.R134a管内沸腾传热关系式的评价分析[J].工程热物理学报,2013,34(12):2299-2304.
[6]邵莉,刘利民,苑伟.R134a卧式螺旋管内沸腾两相流型与传热特性实验研究[J].原子能科学技术,2013,47(3):391-396.
[7]周光辉,张定才.R134a在水平强化管外凝结换热的实验研究[J].制冷学报,2006,27(6):25-28.
[8]张定才,王凯,何雅玲.R134a在水平双侧强化管外沸腾换热[J].化工学报,2007,58(11):2710-2714.
[9]杨光耀,张胜华,李小利.水平双侧强化管单管在R134a中的池沸腾传热实验研究[J].制冷学报,2007,28(1):26-32.
[10]罗昔联,王沣浩,孟祥兆.R22和R407C在水平微肋管内冷凝传热与压降的性能分析[J].制冷与空调,2006,6(6):13-16.
[11]武永强,罗忠.R140A和R22在水平强化管内的蒸发和冷凝性能[J].工程热物理学报,2006,27(2):292-294.
[12]魏义平,陶乐仁,密洁霞.R410A和R22在水平内螺纹管内冷凝性能的实验研究[J].制冷技术,2012,40(12):46-49.
[13]吴晓敏,李辉,龚鹏.水平微肋管内蒸发及冷凝换热性能研究[J].工程热物理学报,2006,27(3):460-462.