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Experimental investigation of refrigerant condensation in circular and square micro- and mini- channels

机译：圆形和方形微型通道制冷剂凝结的实验研究

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摘要

MicroChannel condensers have the potential to improve system level efficiency by increasing the heat transfer coefficient because of the small hydraulic diameters. In addition, they offer a high surface area-to-volume ratio, reducing the overall system size and fluid inventory. Understanding condensation in microchannels is essential for efficient component design, especially with the need for new low Global Warming Potential (GWP) working fluids. Condensation of refrigerants R134a, R245fa and R1234ze(E) in circular (D_h = 1.55 mm) and square (D_h = 0.98 mm) microchannels over a range of mass fluxes (50 < G < 200 kg m~(-2) s~(-1)), saturation temperatures (30 < T_(sat)< 50°C). and wall subcooling (1.7 < △T < 5K) is investigated in this study. It is found that at high mass fluxes (G ≥ 150 kg m~(-)2 s~(-1)), R245fa has a higher heat transfer coefficient and pressure gradient than both R1234ze(E) and R134a, which have comparable heat transfer coefficients at similar conditions. In the circular channel, for a mass flux range of 50 < G < 150 kg m~(-2) s~(-1) and T_(sat) = 30°C, the heat transfer coefficients for R245fa, R134a, and R1234ze(E) varied between 2.3 and 6.7 kW m~(-2) k~(-1), 2.5 and 4.7 kW m~(-2) k~(-1), and 2.2 and 5.4 kW m~(-2) k~(-1),respectively.
机译：微通道冷凝器具有通过增加液压直径的传热系数来提高系统水平效率。此外，它们提供高表面积到体积比，降低整体系统尺寸和流体库存。了解微通道中的凝结对于高效的部件设计至关重要，特别是需要新的低全球变暖潜力（GWP）工作流体。在一系列质量通量范围内的圆形（D_H = 1.55mm）和正方形（D_H = 0.98mm）微通道中的制冷剂R134A，R245FA和R1234ZE（E）的缩合（50

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第9期|121383.1-121383.12|共12页
  • 作者

    Khoudor Keniar; Srinivas Garimella;

  • 作者单位

    Sustainable Thermal Systems Laboratory GWW School of Mechanical Engineering Georgia Institute of Technology Love Building Room 340 801 Ferst Drive Atlanta 30332 GA USA;

    Sustainable Thermal Systems Laboratory GWW School of Mechanical Engineering Georgia Institute of Technology Love Building Room 340 801 Ferst Drive Atlanta 30332 GA USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Condensation; Microchannels; Synthetic refrigerants; Experiments;

    机译：缩合;微通道;合成制冷剂;实验;

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