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Prediction of evaporation heat transfer coefficient and pressure drop of refrigerant mixtures.

Author(s) : JUNG D., RADERMACHER R.

Type of article: Article, IJR article

Summary

Heat transfer coefficients and pressure drops of prospective mixtures to replace R12 and R22 are predicted on the same cooling capacity basis. Results indicate that nucleate boiling is suppressed at qualities greater than 20% for all mixtures and evaporation becomes the main heat transfer mechanism. For the same capacity, some mixtures containing R32 and R152a show 8-10% increase in heat transfer coefficients. Some mixtures with large volatility difference exhibit as much as 55% reduction compared with R12 and R22, caused by mass transfer resistance and property degradation due to mixing (32%) and reduced mass flow rates (23%). Other mixtures with moderate volatility difference exhibit 20-30% degradation due mainly to reduced mass flow rates. The overall impact of heat transfer degradation, however, is insignificant if major heat transfer resistance exists in the heat transfer fluid side (air system).

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Pages: 330-338

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Details

  • Original title: Prediction of evaporation heat transfer coefficient and pressure drop of refrigerant mixtures.
  • Record ID : 1994-0083
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 16 - n. 5
  • Publication date: 1993/09

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