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Nucleate boiling heat transfer coefficients of flammable refrigerants.

Author(s) : JUNG D., LEE H., BAE D., et al.

Type of article: Article, IJR article

Summary

Nucleate boiling heat transfer coefficients (HTCs) of propylene (R1270), propane (R290), isobutane (R600a), butane (R600), and dimethylether (RE170) on a horizontal smooth tube of 19.0 mm outside diameter have been measured. The experimental apparatus was specially designed to accommodate high vapour pressure refrigerants such as propylene and propane with a sight glass. A cartridge heater was used to generate uniform heat flux on the tube. Data were collected in the order of decreasing heat flux from 80 kW m-2 to 10 kW m-2 with an interval of 10 kW m-2 in the pool temperature of 7 °C. Test results exhibited a typical trend that HTCs of flammable refrigerants increase with increasing vapour pressure. Existing nucleate boiling heat transfer correlations showed up to 80% deviation as compared to the present data. Hence, a new correlation was developed through regression analysis taking into account dimensionless variables affecting nucleate boiling heat transfer. The new correlation showed a good agreement with data for flammable refrigerants as well as halogenated refrigerants with a deviation of 5.3%.

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Pages: 409-414

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Details

  • Original title: Nucleate boiling heat transfer coefficients of flammable refrigerants.
  • Record ID : 2004-1587
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 4
  • Publication date: 2004/06

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