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Evaporation and condensation of HFC-134a and CFC-12 in a smooth tube and a micro-fin tube.

Author(s) : ECKELS S. J., PATE M. B.

Summary

Evaporation and condensation heat transfer coefficients were measured for smooth and micro-fin tubes with R134a and R12. Micro-fin tubes are internally enhanced tubes that are characterized by numerous small fins that spiral down the tube. For example, in this study, the micro-fin tube had 60 fins with a height of 0.2 millimeters and a 17 deg spiral angle. Heat transfer measurements were performed on 3.67 meters long tubes with inside diameters of 8.0 millimeters. Test conditions varied from 5 to 15 deg C for evaporation and 30 to 50 deg C for condensation. The refrigerant mass flux was varied from 130 to 400 kilogrammes/m2.second.

Details

  • Original title: Evaporation and condensation of HFC-134a and CFC-12 in a smooth tube and a micro-fin tube.
  • Record ID : 1993-0808
  • Languages: English
  • Publication date: 1991
  • Source: Source: ASHRAE Trans.
    vol. 97; n. 2; 71-81; 14 fig.; 7 tabl.; 15 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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