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Comparaison des zones dédiées et non dédiées pour le sous-refroidissement du condenseur.

Designated vs. non-designated areas for condenser subcooling.

Numéro : pap. 2522

Auteurs : POTTKER G., HRNJAK P.

Résumé

The difference in effect of subcooling in a condenser (non-designated area, NDA) vs. in a subcooler (designated area of the same condenser, DA) on the system performance is experimentally analyzed in a vehicular air conditioning system operating with R134a and R1234yf. With a unique set of microchannel condensers, an experimental comparison between subcooling generated in non-designated area (NDA) and designated area (DA) of the condenser showed that both configurations yielded similar values of maximum COP improvement within the operating conditions considered. The results suggested that the way condenser subcooling is achieved, either in a DA or a NDA, may not be important in terms of COP. The experimental results for non-designated subcooling indicated that the larger the air-refrigerant temperature difference in the condenser, due to a large cooling capacity needed for a given condenser size, the higher the COP maximizing subcooling and the maximum COP improvement from condenser subcooling. For R1234yf, as the temperature difference in the condenser increased from 12 to 28°C, the COP maximizing subcooling increased from 6 to 16°C and the COP gains, from 6 to 44%. Experimental and numerical results also demonstrated that condensers with a higher air-refrigerant temperature difference in the condenser would require a larger COP maximizing area ratio allocated for subcooling. Nevertheless, a fixed designated area yielded near maximum COPs within a reasonable range of operating conditions.

Documents disponibles

Format PDF

Pages : 10 p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

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

Détails

  • Titre original : Designated vs. non-designated areas for condenser subcooling.
  • Identifiant de la fiche : 30006370
  • Langues : Anglais
  • Source : 2012 Purdue Conferences. 14th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 16/07/2012

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