Flow boiling pressure drop of R134a in the counter flow multiport minichannel heat exchangers
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Author list: Kaew-On J., Sakamatapan K., Wongwises S.
Publisher: Elsevier
Publication year: 2012
Journal: Experimental Thermal and Fluid Science (0894-1777)
Volume number: 36
Start page: 107
End page: 117
Number of pages: 11
ISSN: 0894-1777
eISSN: 1879-2286
Languages: English-Great Britain (EN-GB)
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Abstract
In the present study, the pressure drop characteristics during the boiling of R134a as it flows through the multiport minichannel heat exchangers are presented. The heat exchangers are counter flow tube-in-tubes. The refrigerant flow runs through the inner tube, while the hot water flows through the 25.4mm round tube at outer edge of the heat exchanger. Two inner test sections are made from aluminium tubing with hydraulic diameters of 1.1mm for 14 channels and 1.2mm for eight channels. The experiments were carried out at mass fluxes ranging from 350 to 980kg/(m2s), heat fluxes ranging from 18 to 80kW/m2, and saturation pressures of 4, 5 and 6bar, at constant inlet quality of 0.05. The effect of relevant parameters on the frictional pressure drop, such as the saturation pressure, mass flux, heat flux, and aspect ratio, are examined and discussed in detail. Finally, the nine existing correlations that are based on both conventional tubes and small tubes are selected for comparison with the experimental results. ฉ 2011 Elsevier Inc.
Keywords
Flow boiling pressure drop, Tube-in-tube heat exchanger
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