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Étude expérimentale d’un cycle à éjecteur à ultra-haute élévation de température avec un échangeur de chaleur de sous-refroidissement supplémentaire.

Experimental investigation of an ultrahigh-lift ejector cycle with an additional subcooling heat exchanger.

Numéro : 1147

Auteurs : HERDEN D., XU Y., BARTA R. B., THOMAS C.

Résumé

To increase the efficiency of transcritically operated CO2 refrigeration systems, ejectors are often used to recover a portion of expansion losses. However, current CO2 ejector systems are limited to low to medium-pressure lifts, risking lower efficiency, flow separation, and backflow during ejector operation outside the design condition. In response to these challenges, a novel ejector cycle with an additional subcooling heat exchanger has been developed. In this work, an ejector was prototyped using an existing numerical design tool and integrated into a CO2 test stand with a subcooling heat exchanger for experimental testing. The optimized ejector subcooling cycle was compared with two different reference systems: one with flash gas bypass (FGB) and the other one with flash gas compressor (FGC), neither of which employed an ejector. The results showed that the optimized ejector subcooling cycle achieved efficiency increases of up to 40% compared to the FGB system and up to 17% with the FGC.

Documents disponibles

Format PDF

Pages : 10 p.

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 : Experimental investigation of an ultrahigh-lift ejector cycle with an additional subcooling heat exchanger.
  • Identifiant de la fiche : 30032670
  • Langues : Anglais
  • Source : 16th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2024). Proceedings. University of Maryland, College Park, Maryland, USA, August 11-14 2024
  • Date d'édition : 08/2024
  • DOI : http://dx.doi.org/10.18462/iir.gl2024.1147

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