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Une étude basée sur la mécanique des fluides numérique de la performance énergétique d’éjecteurs diphasiques au R744 pour récupérer le travail de détente dans des systèmes frigorifiques : une analyse de l'irréversibilité.

A CFD-based investigation of the energy performance of two-phase R744 ejectors to recover the expansion work in refrigeration systems: an irreversibility analysis.

Auteurs : BANASIAK K., PALACZ M., HAFNER A., et al.

Type d'article : Article, Article de la RIF

Résumé

A CFD-based numerical analysis of the flow irreversibility in R744 ejectors is presented. A validated CFD tool was used to investigate three cases that were differentiated by the mass flow rate per unit area (mass flux) that passed through the mixer, which represented three dissimilar flow patterns. The mixer mass flux was found to significantly affect the ejector performance both locally and globally. An original approach was introduced to assess the contribution of the local irreversibilities to the overall entropy increase. A new factor was proposed to evaluate the ejector performance based on the reference entropy increase in a classic expansion valve. In addition, the influence of the mixer diameter and length on the ejector performance was numerically analysed, which showed that the effects of both geometric parameters may be significant. Namely, in the conditions considered, both enlargement of the mixer cross section area by 17.4% as well as shortening the mixer length by 33.3% resulted in the increase of the overall entropy growth rate by 8.9% and 5.4%, respectively.

Documents disponibles

Format PDF

Pages : 328-337

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 : A CFD-based investigation of the energy performance of two-phase R744 ejectors to recover the expansion work in refrigeration systems: an irreversibility analysis.
  • Identifiant de la fiche : 30010744
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 40
  • Date d'édition : 04/2014

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