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Nucleate boiling heat transfer coefficients of pure halogenated refrigerants.

Author(s) : JUNG D., KO Y., AHN K.

Summary

Nucleate pool boiling heat transfer coefficients of HCFC-123, CFC-11, HCFC-142b, HFC-134a, CFC-12, HCFC-22, HFC-125 and HFC-32 on a horizontal smooth tube of 19.0 mm outside diameter have been measured. A cartridge heater was used to generate uniform heat flux on the tube. Data were taken in the order of decreasing heat flux from 80 to 10 kW/m2 with an interval of 10 kW/m2 in the pool of 7 °C. It was found that nucleate boiling heat transfer correlations available in the literature were not good for certain alternative refrigerants such as HFC-32 and HCFC-142b. Hence, a new correlation was developed by a regression analysis taking into account the variation of the exponent to the heat flux term as a function of reduced pressure and some other properties. The new correlation showed a good agreement with all measured data including those of new refrigerants of significantly varying vapour pressures with a mean deviation of less than 7%.

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Details

  • Original title: Nucleate boiling heat transfer coefficients of pure halogenated refrigerants.
  • Record ID : 2004-2167
  • Languages: English
  • Source: 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Publication date: 2003/08/17

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