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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental investigation during condensation of R-600a vapor over single horizontal integral-fin tubes
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Experimental investigation during condensation of R-600a vapor over single horizontal integral-fin tubes

机译：R-600a蒸气在单个水平整体翅片管上冷凝期间的实验研究

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摘要

In this study, condensation heat transfer coefficients (HTCs) of refrigerant R-600a (iso-butane) over a horizontal smooth tube of outer diameter 19 mm and five integral fin tubes of different fin-densities (945, 1024, 1102, 1181, and 1260 fpm) were determined at vapor temperature of 39±0.5℃ with different wall sub-cooling temperatures in a range of 3-12 ℃. Like other refrigerants, condensation heat transfer coefficients of R-600a showed the same trend with wall sub-cooling where condensation HTCs decrease with the rise in wall sub cooling temperatures. The heat flux was 11-20 kW/m~2 for the plain tube and 28-82 kW/m~2 for integral fin tubes. Based upon the data taken in this study, different graphs were plotted varying different parameters to show their dependency on other parameters. The experimental data were also validated by comparing them against different models.
机译：在这项研究中，制冷剂R-600a（异丁烷）在外径为19 mm的水平光滑管和5个不同翅片密度的整体翅片管上的冷凝传热系数（945，1024，1102，1181，蒸汽温度为39±0.5℃，壁冷水温度为3到12℃，则温度为1260 fpm。像其他制冷剂一样，R-600a的冷凝传热系数与壁式过冷显示出相同的趋势，其中冷凝HTC随着壁式过冷温度的升高而降低。普通管的热通量为11-20 kW / m〜2，一体式翅片管的热通量为28-82 kW / m〜2。根据这项研究中获得的数据，绘制了不同参数的不同图形，以显示它们对其他参数的依赖性。还通过将它们与不同模型进行比较来验证实验数据。

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