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Document IIF

Modélisation thermodynamique de deux éjecteurs bi-étagés au R744 dans les pompes à chaleur utilisant le R744.

Thermodynamic modelling of two-phase R-744 ejectors in R-744 heat pumps.

Numéro : 1173

Auteurs : KRIEZI E. E., KANBUR B. B., MARKUSSEN W. B.

Résumé

This study presents a thermodynamic model for a specific two-phase R-744 ejector geometry to predict the mass flow rates at both motive and suction inlets, ejector outlet pressure, mass entrainment ratio, and ejector efficiency by using two approaches that are i) local coefficient-based approach and ii) predicted local coefficient-based approach. A total number of 66 experimental cases at supercritical motive inlet conditions were used to calculate local coefficients for each case individually, while a neural network-based prediction
algorithm was used to predict those local coefficients and make the local coefficients less dependent on the experimental data-based adjustment. The results showed that the predicted local coefficient-based approach estimated the mass flow rate at the motive inlet, ejector outlet pressure, and quality with maximum deviations up to 5 %, 5 %, and 8 %, respectively. However, there is a high deviation in the calculation of the suction nozzle mass flow.

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 : Thermodynamic modelling of two-phase R-744 ejectors in R-744 heat pumps.
  • Identifiant de la fiche : 30032691
  • Langues : Anglais
  • Sujet : Technologie
  • 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.gl2024.1173

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