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Performance d'un cycle de refroidissement à vitesse variable au CO2 muni d'un détendeur électronique et un échangeur de chaleur interne.

Cooling performance of a variable speed CO2 cycle with an electronic expansion valve and internal heat exchanger.

Auteurs : CHO H., RYU C., KIM Y.

Type d'article : Article, Article de la RIF

Résumé

The cooling performance of a CO2 cycle must be improved to develop a competitive air-conditioning system with the conventional air-conditioners using HFCs. In this study, the cooling performance of a variable speed CO2 cycle was measured and analyzed by varying the refrigerant charge amount, compressor frequency, EEV opening, and length of an internal heat exchanger (IHX). The basic CO2 system without the IHX showed the maximum cooling COP of 2.1 at the compressor discharge pressure of 9.2 MPa and the optimum normalized charge of 0.282. The cooling COP decreased with the increase of compressor frequency at all normalized charges. The optimum EEV opening increased with compressor frequency. Simultaneous control of EEV opening and compressor frequency allowed optimum control of the compressor discharge pressure. The optimal compressor discharge pressure of the modified CO2 cycle with the IHX was reduced by 0.5 MPa. The IHX increased the cooling capacity and COP of the CO2 cycle by 6.2-11.9 and 7.1-9.1%, respectively, at the tested compressor frequencies from 40 to 60 Hz.

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Format PDF

Pages : 664-671

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 : Cooling performance of a variable speed CO2 cycle with an electronic expansion valve and internal heat exchanger.
  • Identifiant de la fiche : 2007-0993
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 30 - n. 4
  • Date d'édition : 06/2007

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