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Etude d'un éjecteur à ratio de section variable avec R600a et R152a comme frigorigènes.

CFD study of a variable area ratio ejector using R600a and R152a refrigerants.

Auteurs : VARGA S., LEBRE P. M. S., OLIVEIRA A. C.

Type d'article : Article, Article de la RIF

Résumé

In this paper, the numerical results for two 1 kW cooling capacity ejectors with variable primary nozzle geometry are presented using R152a and R600a as working fluids. Working fluids were selected based on the criteria of low environmental impact and good performance in the range of operating conditions adequate for using solar thermal energy as primary heat source. Variable area ratio was achieved by applying a movable spindle at the primary nozzle inlet. Numerical results clearly show that adjusting spindle position resulted in a significant improvement of the entrainment ratio compared to a fixed geometry ejector when the operating conditions were different from design values. This increase in ejector performance was as high as 177% for low condenser pressures. Diagrams are also presented for both refrigerants that can be used to find spindle positions that maximise ejector performance under variable operating conditions.

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Pages : 157-165

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Détails

  • Titre original : CFD study of a variable area ratio ejector using R600a and R152a refrigerants.
  • Identifiant de la fiche : 30006476
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 36 - n. 1
  • Date d'édition : 01/2013

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