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Condensation heat transfer coefficients of enhanced tubes with alternative refrigerants for CFC-11 and CFC-12.

Author(s) : JUNG D., KIM C. B., CHO S., SONG K.

Type of article: Article, IJR article

Summary

Condensation heat transfer coefficients (HTCs) of a plain tube, low fin tube, and Turbo-C tube were measured for the low pressure refrigerants CFC-11 and HCFC-123 and for the medium pressure refrigerants CFC-12 and HFC-134a. All data were taken at the vapor temperature of 39°C with a wall subcooling of 3-8°C. Test results showed that the HTCs of HFC-123, an alternative for CFC-11, were 8.2-19.2% lower than those of CFC-11 for all the tubes tested. On the other hand, the HTCs of HCFC-134a, an alternative for CFC-12, were 0.0-31.8% higher than those of CFC-12 for all the tubes tested. For all refrigerants tested, the Turbo-C tube showed the highest HTCs among the tubes tested showing almost an 8 times increase in HTCs as compared to the plain tube. Nusselt's prediction equation yielded a 12% deviation for the plain tube data while Beatty and Katz's prediction equation yielded a 20% deviation for the low fin tube data.

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Pages: 548-557

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Details

  • Original title: Condensation heat transfer coefficients of enhanced tubes with alternative refrigerants for CFC-11 and CFC-12.
  • Record ID : 2000-0042
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 22 - n. 7
  • Publication date: 1999/11

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