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首页> 外文期刊>Journal of Heat Transfer >Effect of Fin Geometry on Condensation of R407C in a Staggered Bundle of Horizontal Finned Tubes
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Effect of Fin Geometry on Condensation of R407C in a Staggered Bundle of Horizontal Finned Tubes

机译：翅片几何形状对水平翅片管交错束中R407C冷凝的影响

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摘要

Experimental results are presented that show the effect of fin geometry on condensation of downward flowing zeotropic refrigerant mixture R407C in a staggered bundle of horizontal finned tubes. Two types of conventional low-fin tubes and three types of three-dimensional-fin tubes were tested. The refrigerant mass velocity ranged from 4 to 23 kg/m~2 s and the condensation temperature difference from 3 to 12 K. The measured condensation heat transfer coefficient was lower than the previous results for R134a, with the difference being more significant for smaller mass velocity. The effect of fin geometry on the condensation heat transfer coefficient was less significant for R407C than for R134a. The effect of condensate inundation was more significant for the three-dimensional-fin tubes than for the low-fin tubes. By using the dimensionless heat transfer correlation for the condensate film that was based on the experimental data for R134a, a superficial vapor-phase heat transfer coefficient was obtained for condensation of R407C. The vapor-phase heat transfer coefficient showed characteristics similar to the vapor-phase mass transfer coefficient that was obtained in the previous study for R123/R134a.
机译：实验结果表明，翅片几何形状对水平翅片管交错排列的向下流动的共沸制冷剂混合物R407C的冷凝有影响。测试了两种类型的常规低翅片管和三种类型的三维翅片管。制冷剂质量速度为4到23 kg / m〜2 s，冷凝温度差为3到12K。测得的冷凝传热系数低于以前R134a的结果，对于较小的质量而言，差异更大。速度。 R407C的翅片几何形状对冷凝传热系数的影响不如R134a显着。三维翅片管冷凝水淹没的影响比低翅片管显着。通过使用基于R134a的实验数据的冷凝膜的无量纲传热相关性，可以得出R407C冷凝的表面气相传热系数。气相传热系数显示出与先前研究R123 / R134a获得的气相传质系数相似的特性。

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