Journal
APPLIED THERMAL ENGINEERING
Volume 22, Issue 16, Pages 1821-1834Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1359-4311(02)00108-4
Keywords
mini-channels; friction factor; heat transfer coefficient; air-conditioning; compact heat exchanger
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This article presents an experimental study of friction factor and heat transfer coefficient for a vertical liquid up-flow of R134a. A flat aluminium multiport extruded tube composed of 11 parallel rectangular channels (3.28 mm x 1.47 mm) with hydraulic diameter of 2.01 mm was used. Mass flux ranges from 28 to 800 kg m(-2) s(-1) and heat flux from 0.84 to 22 kW m(-2). Working pressure is around 2000 kPa and inlet subcooling around 70 K. The results were compared with those found in the literature for conventional tubes and mini-channels, and discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.
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