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Etude sur la performance de pompes à chaleur multi-étagées utilisant des mélanges.

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

Auteurs : JUNG D., KIM H. J., KIM O.

Type d'article : Article, Article de la RIF

Résumé

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.

Documents disponibles

Format PDF

Pages : 402-413

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : A study on the performance of multi-stage heat pump using mixtures.
  • Identifiant de la fiche : 2000-2193
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 22 - n. 5
  • Date d'édition : 08/1999

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