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Etude des capillaires d'un système frigorifique au CO2.

Study of capillary tubes in a transcritical CO2 refrigeration system.

Auteurs : MADSEN K. B., POULSEN C. S., WIESENFARTH M.

Type d'article : Article, Article de la RIF

Résumé

Capillary tubes have been used in refrigeration systems for many years, but not with a transcritical CO2 system. In this article, the effects of capillary tubes in a transcritical CO2 refrigeration system have been investigated experimentally and theoretically. Different types of capillary tubes with different lengths (0.5-4) and diameters (1-2 mm) have been tested. The result of this work is a static model, which is used in the further work to make a simulation model (static) of a complete refrigeration system. The model is based on Friedel's and Colebrook's pressure drop correlations. The behaviour of an adiabatic capillary tube in a refrigeration cycle has been investigated theoretically. The conclusion is that the COP of a system with capillary tubes generally is better than when a fixed high pressure is used, but not as good as when variable optimal high pressure is used. Capillary tubes are especially interesting in applications where the evaporation pressure is constant and the temperature out of the gas cooler varies no more than about 10 K from the design condition. The reduction in COP is more significant at low temperatures out of the gas cooler.

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Format PDF

Pages : 1212-1218

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 : Study of capillary tubes in a transcritical CO2 refrigeration system.
  • Identifiant de la fiche : 2006-0729
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 28 - n. 8
  • Date d'édition : 12/2005

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