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Heat Transfer Research
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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2020031066
pages 975-990

HEAT TRANSFER AND PRESSURE DROP DURING CONDENSATION OF R-410A IN ALUMINUM EXTRUDED ENHANCED TUBES

Nae-Hyun Kim
Department of Mechanical Engineering, Incheon National University, 12-1 Songdo-Dong, Yeonsu-Gu Inchon, 22012, Korea

ABSTRAKT

The literature shows that axial microfin tubes and spoke tubes are promising means for enhancing condensation of refrigerants in them. However, studies are lacking, and those available are generally limited to high mass fluxes. In this study, condensation heat transfer and pressure drop tests were performed on four tubes−smooth, helical microfin, axial microfin, spoke−having 7.0-mm outer diameter for the mass flux from 50 to 250 kg/m2·s using R-410A. During the test, the heat flux and the saturation temperature were maintained at 3.0 kW/m2 and 46°C. At low mass fluxes, helical microfin tube yields the best heat conductance (hiAi) enhancement. Above 150 kg/m2s, however, the best enhancement is obtained from the axial microfin tube. The spoke tube yields approximately an intermediate heat conductance enhancement. Possible reasoning is provided based on the flow pattern in each tube. As for the pressure drop, the spoke tube shows significantly higher pressure drop than other tubes. In addition, the pressure drops of the axial microfin tube are higher than those of the helical microfin tube. Possible explanations are provided considering the effect of hydraulic diameter on pressure drop.

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