基于紧凑型设计5mm翅片管式换热器的数值模拟及分析
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摘要
本文主要研究片距对翅片管式换热器空气侧换热性能和压降的影响。目前5mm管径的翅片片距通常处于1.2mm～1.3mm之间,通过紧凑式设计加工方法可以使其片距减少至0.8mm～1.0mm。论文主要从理论分析、三维建模以及Fluent计算来进行分析对比翅片片距的减少对换热能力和空气压损两个方面的影响。相同的迎风面积和风速下,随着片距的减小,能力逐渐升高,但同时压损和功率增加,说明片距减少的同时,必须得解决翅片加密导致的风量下降问题,有效评估分析接触热阻的影响,否则换热面积不能充分利用,此研究可以为换热器翅片设计提供一些参考。
The effect of fin spacing on the heat transfer performance and pressure drop of fin and tube heat exchangers is studied in this paper. At present, the fin spacing of 5 mm diameter is usually between 1.2 mm and 1.3 mm. The fin spacing can be reduced to 0.8 mm to1.0 mm by means of compact design and machining. This paper mainly analyzes and compares the influence of fin pitch reduction on heat transfer capability and air pressure loss from theoretical analysis, three-dimensional modeling and fluent calculation. Under the same windward area and wind speed, with the decrease of fin spacing, the capacity increases gradually, but the pressure loss and power increase at the same time. It shows that the problem of air loss caused by fin infilling must be solved at the same time when the fin spacing decreases, effectively analyze the influence of contact thermal resistance.Otherwise, the heat transfer area can't be fully utilized. This study can provide some references for fin design of heat exchangers.
The effect of fin spacing on the heat transfer performance and pressure drop of fin and tube heat exchangers is studied in this paper. At present, the fin spacing of 5 mm diameter is usually between 1.2 mm and 1.3 mm. The fin spacing can be reduced to 0.8 mm to1.0 mm by means of compact design and machining. This paper mainly analyzes and compares the influence of fin pitch reduction on heat transfer capability and air pressure loss from theoretical analysis, three-dimensional modeling and fluent calculation. Under the same windward area and wind speed, with the decrease of fin spacing, the capacity increases gradually, but the pressure loss and power increase at the same time. It shows that the problem of air loss caused by fin infilling must be solved at the same time when the fin spacing decreases, effectively analyze the influence of contact thermal resistance.Otherwise, the heat transfer area can't be fully utilized. This study can provide some references for fin design of heat exchangers.
引文
[1]杨世铭,陶文铨.传热学[M].北京:高等教育出版社,2006.
[2]Reay DA.Compact the heat exchangers,enhancement and heat pumps[J].International Journal of Refrigeration,2002,25:460-470.
[3]屈治国,何雅玲,陶文铨.平直开缝翅片传热特性的三维数值模拟及场协同原理分析[J].工程热物理学报,2003,24(5):825-827.
[4]张智,涂旺荣等.空调换热器用风冷冷凝器换热能力实验研究[J].暖通空调,2004(3).
[5]李惠珍,屈志国,陶文铨.开缝翅片流动和传热性能的试验研究与数值模拟[J].西安交通大学学报,2005,39(3):229-232.
[6]吴恩,周帼彦,涂善东.紧凑式换热器性能比较及经济性分析[J].化工机械,2006(5).
[7]刘建,魏文建,丁国良等.翅片管换热器换热与压降特性的试验研究进展[J].制冷学报,2003(3):25-30.
[8]周宇,李惠珍,陶文锉.百叶窗翅片的传热与阻力特性的数值模拟[C].中国动力工程学会第三届青年学术年会论文集,2005.
[9]吴恩,周帼彦,涂善东.紧凑式换热器性能比较及经济性分析[J].石油化工设备,2006(3).
[10]胡忠霞,崔晓钰,李美玲,马虎根,任禾盛.紧凑式换热器的设计及综合性能分析软件[J].上海理工大学学报,2004(5).
[2]Reay DA.Compact the heat exchangers,enhancement and heat pumps[J].International Journal of Refrigeration,2002,25:460-470.
[3]屈治国,何雅玲,陶文铨.平直开缝翅片传热特性的三维数值模拟及场协同原理分析[J].工程热物理学报,2003,24(5):825-827.
[4]张智,涂旺荣等.空调换热器用风冷冷凝器换热能力实验研究[J].暖通空调,2004(3).
[5]李惠珍,屈志国,陶文铨.开缝翅片流动和传热性能的试验研究与数值模拟[J].西安交通大学学报,2005,39(3):229-232.
[6]吴恩,周帼彦,涂善东.紧凑式换热器性能比较及经济性分析[J].化工机械,2006(5).
[7]刘建,魏文建,丁国良等.翅片管换热器换热与压降特性的试验研究进展[J].制冷学报,2003(3):25-30.
[8]周宇,李惠珍,陶文锉.百叶窗翅片的传热与阻力特性的数值模拟[C].中国动力工程学会第三届青年学术年会论文集,2005.
[9]吴恩,周帼彦,涂善东.紧凑式换热器性能比较及经济性分析[J].石油化工设备,2006(3).
[10]胡忠霞,崔晓钰,李美玲,马虎根,任禾盛.紧凑式换热器的设计及综合性能分析软件[J].上海理工大学学报,2004(5).