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High-pressure Condensing Refrigerant Flows Through Microchannels, Part Ⅱ: Heat Transfer Models

机译:高压冷凝制冷剂流过微通道,第Ⅱ部分:传热模型

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摘要

Condensation of high-pressure refrigerants in small-diameter channels over a wide range of reduced pressures approaching the critical point is investigated in this two-part study. Part I presented pressure drop measurements and a two-phase pressure drop model. In this paper, Part II of the study, a condensation heat transfer model is presented. Heat transfer coefficients were measured during condensation of R404A in circular channels (inner diameter = 0.86, 1.55, 3.05 mm) over the entire quality range. The saturation temperature was varied from 30 to 60 degrees C, and mass flux from 200 to 800 kg m(-2) s(-1), to evaluate their effects on condensation heat transfer coefficient. The heat transfer model is developed using a microchannel flow regime map and the void fraction model previously developed by the authors. The resulting model predicts 93.6% of the data within +/- 25%. The model exhibited good agreement with data from condensing ammonia and carbon dioxide, predicting 84.8% and 97% of their data within +/- 25%, respectively.
机译:在这两个部分研究中,研究了在临时临界点的广泛降低压力范围内的小直径通道中的高压制冷剂的冷凝。第一部分呈现压降测量和两相压降模型。本文提出了研究的第二部分,提出了一种冷凝传热模型。在整个质量范围内的圆通道(内径= 0.86,1.55,3.05mm)中R404a的冷凝期间测量传热系数。饱和温度在30至60℃变化,质量助熔剂从200至800kg m(-2)(-1),以评估它们对冷凝传热系数的影响。传热模型是使用MicroChannel流动制度图和前面由作者开发的空隙率模型开发的。由此产生的模型预测+/- 25%内的数据的93.6%。该模型与缩合氨和二氧化碳的数据表现出良好的一致性,预测其在+/- 25%内的84.8%和97%的数据。

著录项

  • 来源
    《Heat Transfer Engineering》 |2019年第12期|830-843|共14页
  • 作者单位

    ExxonMobil Upstream Res Co Houston TX USA;

    Georgia Inst Technol George W Woodruff Sch Mech Engn Sustainable Thermal Syst Lab 801 Ferst Dr Atlanta GA 30332 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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