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Journal of Enhanced Heat Transfer
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ISSN Druckformat: 1065-5131
ISSN Online: 1563-5074

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v7.i5.20
pages 311-325

Flow Condensation in Smooth and Micro-fin Tubes with HCFC-22, HFC-134a and HFC-410 Refrigerants. Part II: Design Equations

Liangyou Tang
Outokumpu Copper Franklin, Inc., 4720 Bowling Green Road, Franklin, KY 42134
Michael M. Ohadi
Small and Smart Thermal Systems Laboratory, Center for Energy Environmental Engineering, Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742, USA
Arthur T. Johnson
Department of Biological Resources Engineering, University of Maryland, College Park, MD 20742

ABSTRAKT

An empirical study of single-phase convection and flow condensation heat transfer in horizontal tubes was conducted. Three refrigerants (HCFC-22, HFC-134a and HFC-410A), a smooth tube, and three micro-fin tubes (axial, helical and Crosshatch enhancement) were examined. Commonly cited correlations were evaluated, utilizing the experimental data obtained in Part I of this study. Although these correlations had fairly good agreement with HCFC-22 and HFC-134 results, all of them failed to predict HFC-410A performance. A modified Shah equation was developed for smooth tube annular flow condensation, which overcomes the shortcomings of the existing correlations. Furthermore, design equations were developed for single-phase heat transfer and two-phase condensation with all three micro-fin tubes investigated, and covering all three refrigerants tested.


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