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ACRC Technical Report 114PDF


Title:Heat Transfer and Pressure Drop During Condensation of Refrigerant 134a in an Axially Grooved Tube
Author(s):Graham, D.M.; Chato, J.C.; Newell, T.A.
Subject(s):void fraction
refrigerant condensation and evaporation
Abstract:R134a condensation experiments have been petfonned over a mass flux range of 75 to 450 kg/m2-s (55 to 330 klbm/ft2-hr) in an 8.91 rom (0.351") inside diameter, axially grooved, microfin tube. At 75 kg/m2-s (55 klbm/ft2-hr), the axially grooved tube petfonns marginally better than a smooth tube, but worse than a similarly grooved tube with an 18 degree helix angle over a broad range of refrigerant qualities. Mass fluxes at 150 kg/m2-s (110 klbm/ft2-hr) and greater show broad quality ranges in which the axially grooved tube petfonns significantly better than both smooth and helically grooved tubes. Examination of a Froude rate parameter indicates that the axially grooved tube is able to maintain an annular film flow characteristic that results in more efficient heat transfer. Pressure drop characteristics of the axially grooved tube are similar to those found in an 18 degree helix angle tube.
Issue Date:1997-03
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-114
Genre:Technical Report
Sponsor:Air Conditioning and Refrigeration Project 74
Date Available in IDEALS:2009-04-24

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