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Two-phase heat exchange for new refrigerants and their mixtures.

Author(s) : STEPHAN K.

Type of article: Article, IJR article

Summary

Boiling and condensation heat transfer coefficients of mixtures are often considerably lower than those of the pure components. The reduction depends mainly on the difference between dew- and bubble-point temperature for a given concentration. In forced-convection boiling, these effects are well described by a model, tested with over 13,000 data points which also applies to refrigerant mixtures. When vapours are condensed, the usual assumption of film condensation often does not hold for mixtures, particularly at condensation rates that are not too large. Measured heat-transfer coefficients are then larger by up to a factor of 4 than those of film condensation. In the case of larger condensation rates, subcooling of the vapour phase with subsequent fog formation can occur.

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Pages: 198-209

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Details

  • Original title: Two-phase heat exchange for new refrigerants and their mixtures.
  • Record ID : 1996-0063
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 18 - n. 3
  • Publication date: 1995/03

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