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首页> 外文期刊>International Journal of Heat and Mass Transfer >Saturated vapour condensation of R410A inside a 4 mm ID horizontal smooth tube: Comparison with the low GWP substitute R32
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Saturated vapour condensation of R410A inside a 4 mm ID horizontal smooth tube: Comparison with the low GWP substitute R32

机译：内径为4 mm的水平光滑管内R410A的饱和蒸汽冷凝：与低GWP替代品R32的比较

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摘要

This study performs the comparative analysis of R32 and R410A condensation inside a 4 mm ID smooth tube. The experimental tests were carried out at three different saturation temperatures, 30 °C, 35 °C, and 40 °C, at different vapour quality and mass velocities to evaluate the specific contribution of refrigerant mass flux, mean vapour quality, and condensation temperature (pressure). The frictional pressure drops exhibit great sensitivity to all the operating variables considered, while the condensation heat transfer coefficients show great sensitivity only to refrigerant mass flux and mean vapour quality. The transition between gravity controlled and forced convection condensation occurred in the range of the equivalent Reynolds number 10,000–20,000. The Friedel (1979) correlation was able to predict properly the entire set of frictional pressure drops data, while the Akers et al. (1959) model gave a fair estimation of the forced convection condensation heat transfer coefficients. R32 exhibits condensation heat transfer coefficients and frictional pressure drops higher than those of R410A and it seems a valuable low GWP substitute for R410A.
机译：本研究对内径为4mm的光滑管中的R32和R410A冷凝物进行了比较分析。实验测试是在30°C，35°C和40°C三种不同的饱和温度，不同的蒸汽质量和质量速度下进行的，以评估制冷剂质量通量，平均蒸汽质量和冷凝温度的特定贡献（压力）。摩擦压降对所有考虑的操作变量都表现出极大的敏感性，而冷凝传热系数仅对制冷剂质量通量和平均蒸气质量表现出极大的敏感性。重力控制和强迫对流冷凝之间的过渡发生在等效雷诺数10,000–20,000的范围内。 Friedel（1979）的相关性能够正确预测整个摩擦压降数据集，而Akers等人（1979）。 （1959）模型对强迫对流冷凝传热系数给出了合理的估计。 R32的凝结传热系数和摩擦压降均高于R410A，这似乎是R410A的一种有价值的低GWP替代品。

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