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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.i5.10
pages 289-310

Flow Condensation in Smooth and Micro-fin Tubes with HCFC-22, HFC-134a and HFC-410A Refrigerants. Part I: Experimental Results

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

A study of single-phase convection and flow condensation heat transfer in horizontal copper tubes (8.81 mm inside diameter) was conducted using three refrigerants (HCFC-22, HFC-134a and HFC-410A). A smooth tube and three micro-fin tubes (axial, helical and Crosshatch enhancement) were examined. Local-mean flow condensation data were experimentally obtained. Experimental conditions were selected to reflect typical operating conditions encountered in refrigeration and air-conditioning applications. All micro-fin tubes illustrated significant enhancement in single-phase convection and flow condensation. The cross-hatch enhancement performed particularly better in both single-phase convection and flow condensation. For the three refrigerants investigated, the refrigerant type seemed to have little influence on the enhancement mechanism of the micro-fin tubes examined. The experimental results are presented in Part I. Development of design equations is presented in Part II.


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EXPERIMENTAL RESULTS OF FLOW CONDENSATION IN SMOOTH AND MICRO-FIN TUBES WITH HCFC-22, HFC-134A AND HFC-410A REFRIGERANTS
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