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Condensation of R134a and R12 in smooth and internally finned tubes.

Author(s) : KOOPS P. E., AZER N. Z.

Summary

The experimental heat transfer and pressure drop results taken during condensation of R12 and R134a inside smooth and internally finned tubes are reported. Two sets of tubes were tested. Each set consisted of two tubes (one internally finned, one smooth) of equal outside diameter. R134a heat transfer coefficients were 18 to 28% higher than those for R12 for both the finned and smooth tubes. For both refrigerants the heat transfer enhancement due to the internal fins was in the range of 1.5 to 2.3. In the internally finned tubes, R134a gave slightly higher pressure drop results than did R12. The smooth tube pressure drop data were inconclusive due to the low pressure drops experienced. A new correlation was developed to predict the condensation heat transfer coefficients. The pressure drop results could be correlated by existing correlations.

Details

  • Original title: Condensation of R134a and R12 in smooth and internally finned tubes.
  • Record ID : 1995-1556
  • Languages: English
  • Publication date: 1993/11/01
  • Source: Source: CLIMA 2000, London
    n. 343; 10 p.; 8 fig.; 1 tabl.; 5 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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