每年出版 8 期
ISSN 打印: 1065-5131
ISSN 在线: 1563-5074
Indexed in
Flow Condensation in Smooth and Micro-fin Tubes with HCFC-22, HFC-134a and HFC-410A Refrigerants. Part I: Experimental Results
摘要
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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