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A study on the performance of multi-stage heat pump using mixtures.

Author(s) : JUNG D., KIM H. J., KIM O.

Type of article: Article, IJR article

Summary

Multi-stage heat pumps composed of a condenser, evaporator, compressor, suction line heat exchanger, and low and/or high stage economizers are studied by computer simulation. Their thermodynamic performance and design options are examined for various working fluids. In the simulation, HCFC-22/HCFC-142b and HCFC-134a are studied as an interim and long term alternatives for CFC-12 while HFC-23/HFC-134a and HCFC-125/HFC-134a are studied as long term alternatives for HCFC-22. The results indicate that the three-stage super heat pump with appropriate mixtures is up to 27.3% more energy efficient than the conventional single-stage system with pure fluids. While many factors contribute to the performance increase of a super heat pump, the most important factor is found to be the temperature matching between the secondary heat transfer fluid and refrigerant mixture, which is followed by the use of a low stage economizer and suction line heat exchanger. The contribution resulting from the use of a high stage economizer, however, is not significant. With the suction line heat exchanger, the system efficiency increases more with the fluids of larger molar specific heats. From the view point of volumetric capacity and energy efficiency, a 40% HCFC-22/60% HCFC-142b mixture is proposed as in interim alternative for CFC-12 while a 25% HFC-32/75% HFC-134a mixture is proposed as a long term alternative for HCFC-22.

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Pages: 402-413

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Details

  • Original title: A study on the performance of multi-stage heat pump using mixtures.
  • Record ID : 2000-2193
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 22 - n. 5
  • Publication date: 1999/08

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