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Document IIF

Nouveau cycle à éjecteur en cascade utilisant des frigorigènes naturels.

Novel cascade ejector cycle using natural refrigerants.

Numéro : pap. ID: 490

Auteurs : CARDEMIL J., COLLE S.

Résumé

This study focuses on the thermodynamic analysis of a cascade ejector refrigeration cycle. Two environmentally-friendly fluids are use: water for the upper cycle and CO2 for the lower one. The conjugation of the two ejector cycles is proposed in order to operate the CO2 sub-cycle with subcritical pressures, thus increasing the coefficient of performance (COP). Due to the characteristics of these natural fluids, the traditional one-dimensional analysis cannot be applied to ejector performance prediction. Thus, the ejectors are analyzed using an improved methodology based on real gas equations and Wood’s approximation for two-phase speed of sound calculations. Using this methodology simulations are carried out in order to analyze the effect of the operation temperature of the intercoolers, regarding to the operation of a solar-assisted ice maker. The results show that under the base case conditions the COP of the system is 0.2, and this value is highly dependent on the operational temperature of the intercooler.

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Pages : 8 p.

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Détails

  • Titre original : Novel cascade ejector cycle using natural refrigerants.
  • Identifiant de la fiche : 30003214
  • Langues : Anglais
  • Source : Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Date d'édition : 21/08/2011

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