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首页> 外文期刊>International Journal of Refrigeration >Film condensation heat transfer characteristics of R134a on horizontal stainless steel integral-fin tubes at low heat transfer rate
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Film condensation heat transfer characteristics of R134a on horizontal stainless steel integral-fin tubes at low heat transfer rate

机译：R134a在水平不锈钢整体翅片管上低传热率下的膜凝结传热特性

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摘要

Condensation heat transfer characteristics of R134a on the integral-fin tubes are experimentally investigated. The test tubes are made of stainless steel, and the root diameter of the tubes is 13.27 mm. The height of fin is 1.19 mm, and the densities of the integral fin are 19 fpi and 26 fpi. The present tests were conducted at the saturation temperatures of 20℃ and 30℃. The condensation heat transfer coefficients of the tubes having 19 fpi and 26 fpi at the saturation temperature of 20℃ are higher than that of the plain tube by 4.4 and 3.1 times, respectively. When the temperature difference across the condensate film is less than 0.7℃, the enhancement of the tube of 19 fpi is muth larger than that of the tube of 26 fpi. The Honda and Nozu model shows the smallest mean deviation between the estimated values and experimental results among the existing models.
机译：实验研究了R134a在整体翅片管上的冷凝传热特性。试管由不锈钢制成，试管的根部直径为13.27毫米。鳍片的高度为1.19 mm，整体鳍片的密度为19 fpi和26 fpi。目前的测试是在20℃和30℃的饱和温度下进行的。在20℃的饱和温度下，具有19 fpi和26 fpi的管子的冷凝传热系数分别比普通管高4.4和3.1倍。当冷凝膜上的温差小于0.7℃时，19 fpi的管的增强幅度要比26 fpi的管的增强幅度大。本田和Nozu模型在现有模型中显示出估计值和实验结果之间的最小平均偏差。

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