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首页> 外文期刊>Journal of Heat Transfer >Pressure Drop During Refrigerant Condensation Inside Horizontal Smooth, Helical Microfin, and Herringbone Microfin Tubes
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Pressure Drop During Refrigerant Condensation Inside Horizontal Smooth, Helical Microfin, and Herringbone Microfin Tubes

机译：水平光滑，螺旋微翅片和人字形微翅片管内的制冷剂冷凝过程中的压降

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摘要

This paper presents a study of pressure drops during condensation inside a smooth, an I8-deg helical microfin, and a herringbone microfin tube. Measurements were conducted with refrigerant flowing through the tube of a concentric heat exchanger, with water flowing in a counterflow direction in the annulus. Each tube was part of a condenser consisting of eight subcondensers with instrumentation preceding each subcondenser. Three refrigerants were used, namely, R-22, R-407C, and R-134a, all operating at a saturation temperature of 40℃ with mass fluxes ranging from 400 to 800 kg/m~2 s. Inlet qualities ranged from 0.85 to 0.95 and outlet qualities ranged from 0.05 to 0.15. The test results showed that on average for the three refrigerants the pressure gradients of the herringbone microfin tube were about 79% higher than that of the smooth tube and about 27% higher than that of the helical microfin tube. Further, a correlation from the literature for predicting pressure drops inside a helical microfin tube was modified for the herringbone microfin tube. The modified correlation predicted the data to within an error of 1% and had an absolute mean deviation of 6.8%. This modified correlation compared well with a correlation from the literature that predicted the data to within an error of 7%.
机译：本文介绍了在光滑的，I8度的螺旋形微翅片和人字形微翅片管内凝结过程中压降的研究。测量是在制冷剂流过同心换热器管的情况下进行的，水在环形空间中以逆流方向流动。每个管都是冷凝器的一部分，该冷凝器由八个子冷凝器组成，每个子冷凝器之前都有仪器。使用了三种制冷剂，即R-22，R-407C和R-134a，它们均在40℃的饱和温度下工作，质量流量范围为400至800 kg / m〜2 s。入口质量范围为0.85至0.95，出口质量范围为0.05至0.15。测试结果表明，对于三种制冷剂，人字形微翅片管的平均压力梯度比光滑管的平均压力梯度高约79％，而比螺旋形微翅片的压力梯度高约27％。此外，针对人字形微翅片管修改了文献中用于预测螺旋形微翅片管内部压降的相关性。改进的相关性将数据预测为误差在1％以内，绝对平均偏差为6.8％。修改后的相关性与文献中预测数据误差在7％之内的相关性进行了很好的比较。

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