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Experimental study on pool boiling heat transfer of R-134a/oil mixtures outside single horizontal enhanced tubes.

Author(s) : FEI J., HU W. Y., WANG Z. M., et al.

Summary

Different oil concentration and heat transfer condition have different effects. In this paper, heat transfer coefficients are experimentally determined for three horizontal enhanced tubes with R-134a/oil mixtures. The evaporation temperatures are at 10 and 5°C, respectively and the refrigerant velocity is ranged from 1.5 to 3.5 m/s. The results show that the reinforcement magnification of E21, E22 and E23 is 3.703, 3.035 and 2.709, respectively. The heat transfer coefficients with 100 ppm increase to 103.7-107% (the evaporation temperature is at 5°C) and 100.8-110.9% than that of (the evaporation temperature is at 5°C) with 50ppm. The paper may play a foundation for design of evaporator.

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Pages: ICR07-B1-1418

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Details

  • Original title: Experimental study on pool boiling heat transfer of R-134a/oil mixtures outside single horizontal enhanced tubes.
  • Record ID : 2008-0104
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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