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Etude sur un système à pompe à chaleur au R-744 avec compresseur Voorhees.

Investigation of R-744 Voorhees transcritical heat pump system.

Auteurs : ZHA S., HAFNER A., NEKSA P.

Type d'article : Article, Article de la RIF

Résumé

Using economizer in R-744 heat pump cycle is an effective way to improve the heating capacity in cold climates. In this paper, a modification construction of reciprocating compressor with economizer port, a Voorhees compressor was introduced and the heat pump cycle with Voorhees economizer was compared with the traditional screw or scroll economizer cycles. Both the R-744 transcritical heat pumps with and without Voorhees economizer were tested at the same conditions with different air mass flow rates and different evaporating temperatures. The results show that the heating capacity of the heat pump with Voorhees economizer can be two times higher than the transcritical heat pump without economizer at low evaporating temperature conditions. At the same capacity operation conditions, the efficiency of the heat pump with Voorhees economizer is higher at high refrigerant mass flow rate conditions. The optimum discharge pressure of the heat pump with Voorhees economizer is found to be higher than the heat pump without economizer at the same ambient conditions. For mobile heat pump application, CO2 transcritical heat pump with Voorhees economizer demonstrates better performance comparing to the conventional transcritical CO2 heat pump without economizer when the evaporating temperature is lower than -20°C, or when the mobile is idling with low compressor RPM.

Documents disponibles

Format PDF

Pages : 16-22

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 : Investigation of R-744 Voorhees transcritical heat pump system.
  • Identifiant de la fiche : 2008-0509
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 31 - n. 1
  • Date d'édition : 01/2008

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