汽车空调多元平行流冷凝器的数值模拟
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摘要
介绍多元平行流冷凝器的结构类型特点和前人的试验及理论研究成果,利用有限元软件对冷凝器空气侧百叶窗翅片的耦合传热进行数值模拟计算,揭示空气侧百叶窗翅片内部的流场结构,研究迎面风速和翅片间距变化对多元平行流冷凝器传热和流动性能的影响.结果表明,多元平行流冷凝器换热性能随迎面风速的变大先变好,后趋于恒定;在其它结构参数不变的情况下,较小的翅片间距可获得较好的换热性能.同时,在进口制冷剂流量相同的情况下,对3组不同扁管伸入集流管深度H模型进行数值模拟,得到制冷剂在各模型下出口流量情况.
This paper describes the structure types and characteristics of multiple parallel flow condenser and predecessors research results, the numerical simulation was carried out with finite element software to study the coupled heat transfer of the air side louver fin of the condenser, the numerical results reveal the flow field structure in the fin of the air side louver fin.The effects of head-on wind speed and fin spacing on heat transfer and fluidity of multiple parallel flow condenser were studied. Results show that heat transfer performance of multiple parallel flow condenser improved first with the increase of head-on wind speed, then tend to be constant. In the case of other structural parameters unchanged, better heat transfer performance can be obtained with smaller fin spacing.
This paper describes the structure types and characteristics of multiple parallel flow condenser and predecessors research results, the numerical simulation was carried out with finite element software to study the coupled heat transfer of the air side louver fin of the condenser, the numerical results reveal the flow field structure in the fin of the air side louver fin.The effects of head-on wind speed and fin spacing on heat transfer and fluidity of multiple parallel flow condenser were studied. Results show that heat transfer performance of multiple parallel flow condenser improved first with the increase of head-on wind speed, then tend to be constant. In the case of other structural parameters unchanged, better heat transfer performance can be obtained with smaller fin spacing.
引文
[1] 刘舒,胡益雄,黄新兆.微通道换热器在压缩冷凝机组中的应用分析[J].制冷与空调,2010,24(2):31-34.
[2] PARKC Y,HRNJAK P.Experimental and numerical study on microchannel and round-tube condensers in a R410A residential air-conditioning system[J].International Journal of Refrigeration,2007,31(5):822-831.
[3] DONG J Q,CHEN J P,CHEN Z J,et al.Heat transfer and pressure drop correlations for the multi-louvered fin compact heat exchangers[J].Energy Conversion and Management,2007,48(5):1506-1515.
[4] ZHANG J Z,LI W,SHERIF S A.A numerical study of condensation heat transfer and pressure drop in horizontal round and flattened minichannels[J].International Journal of Thermal Sciences,2016,106:80-93.
[5] HUANG L,LEE M S,SALEH K,et al.A computational fluid dynamics and effectiveness-NTU based co-simulation approach for flow mal-distribution analysis in microchannel heat exchanger headers[J].Applied Thermal Engineering,2014,65:447-457.
[6] 饶荣水,陈俊伟,蔡宗军,等.微通道换热器在空调器上的应用研究[J].制冷与空调,2009,9(4):231-235.
[7] 谷波,方继华,赵鹏程.空气侧结构对多元微通道平行流冷凝器传热流动性能的影响[J].制冷学报,2014,35(6):9-16.
[8] 房颖,薛娇.进口速度对汽车空调冷凝器翅片换热性能影响分析[J].农机使用与维修,2015(4):24-25.
[9] PERROTIN T,CLODIC D.Thermal-hydraulic CFD studying in louvered fin-and-flat-tube heat exchangers[J].International Journal of Refrigeration,2004,27(4):422-462.
[10] 陶文锉.数值传热学[M].2版.西安:西安交通大学出版社,2001.
[2] PARKC Y,HRNJAK P.Experimental and numerical study on microchannel and round-tube condensers in a R410A residential air-conditioning system[J].International Journal of Refrigeration,2007,31(5):822-831.
[3] DONG J Q,CHEN J P,CHEN Z J,et al.Heat transfer and pressure drop correlations for the multi-louvered fin compact heat exchangers[J].Energy Conversion and Management,2007,48(5):1506-1515.
[4] ZHANG J Z,LI W,SHERIF S A.A numerical study of condensation heat transfer and pressure drop in horizontal round and flattened minichannels[J].International Journal of Thermal Sciences,2016,106:80-93.
[5] HUANG L,LEE M S,SALEH K,et al.A computational fluid dynamics and effectiveness-NTU based co-simulation approach for flow mal-distribution analysis in microchannel heat exchanger headers[J].Applied Thermal Engineering,2014,65:447-457.
[6] 饶荣水,陈俊伟,蔡宗军,等.微通道换热器在空调器上的应用研究[J].制冷与空调,2009,9(4):231-235.
[7] 谷波,方继华,赵鹏程.空气侧结构对多元微通道平行流冷凝器传热流动性能的影响[J].制冷学报,2014,35(6):9-16.
[8] 房颖,薛娇.进口速度对汽车空调冷凝器翅片换热性能影响分析[J].农机使用与维修,2015(4):24-25.
[9] PERROTIN T,CLODIC D.Thermal-hydraulic CFD studying in louvered fin-and-flat-tube heat exchangers[J].International Journal of Refrigeration,2004,27(4):422-462.
[10] 陶文锉.数值传热学[M].2版.西安:西安交通大学出版社,2001.