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- W4387580617 abstract "In this work, we report condensation heat transfer coefficient and pressure drop data for R-454B, R-32, and R-454C, which are low Global Warming Potential (GWP) replacements for R-410A. These data were obtained in a smooth 7.2 mm outer diameter (5.94 mm inner diameter) aluminum tube. In these experiments, condensation temperature (35 °C ≤Tcond≤50 °C) and refrigerant mass flux (151.1≤G≤347.3 kg m−2 s−1) were key variables. In general for similar operating conditions, we measured the highest heat transfer coefficients for R-32 and the lowest for R-454C. Among the correlations used to predict our heat transfer data for all three refrigerants, the one developed by Thome et al. (2003) predicted the data with the greatest accuracy. Deviations between experimental data and predictions of this correlation were 21.7% for R-454B (with SBG correction), 22.0% for R-32, and 18.8% for R-454C (with SBG correction). Experimental pressure gradient data were predicted by the Friedel correlation Friedel (1979) with deviations of 13.8% for R-454B, 9.8% for R-32, and 10.2% for R-454C. In this work, we also compare the predictions of the Cavallini et al. correlation Cavallini et al. (2006) for R-454B and R-32 in smooth copper versus smooth aluminum tubes. To improve this correlation’s predictive capability for aluminum tubes, we have proposed some modifications. After these modifications were made, the deviations between the correlation’s predictions and our data were 10% for R-454B (with SBG correction), 8.1% for R-32, and 5.2% for R-454C (with SBG correction). These data and findings will assist the HVAC and refrigeration industry to implement low-GWP refrigerants in condensers using smooth aluminum tubes." @default.
- W4387580617 created "2023-10-13" @default.
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- W4387580617 date "2023-10-01" @default.
- W4387580617 modified "2023-10-14" @default.
- W4387580617 title "Condensation heat transfer and pressure drop of low–global warming potential refrigerants in smooth aluminum tubes" @default.
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- W4387580617 doi "https://doi.org/10.1016/j.applthermaleng.2023.121774" @default.
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