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Impact des théories de mélange sur les performances des cycles frigorifiques à détente par éjecteur pour des frigorigènes respectueux de l’environnement.

Impact of the mixing theories on the performance of ejector expansion refrigeration cycles for environmentally-friendly refrigerants.

Auteurs : ATMACA A. U., EREK A., EKREN O.

Type d'article : Article, Article de la RIF

Résumé

Ejector expansion refrigeration cycle was investigated theoretically to compare the constant pressure mixing and constant area mixing ejector theories making use of thermodynamic models. Performance improvement was presented according to optimum and constant value pressure drop assumptions in order to simulate the design and off-design conditions, respectively. The agreement between the results with respect to both pressure drop assumptions is better at higher condenser and lower evaporator temperatures for each ejector mixing theory. Optimum area ratio (?opt) is less for constant area mixing approach since the ratio of the secondary flow velocity to the primary flow is higher for this ejector theory at each operation point. Although a group of low-global-warming-potential refrigerants were compared in terms of the performance and expansion losses, deep investigations were presented for R1234yf in main and sometimes R1234ze(E). Finally, when compared to other ejector sections, the mixing section efficiency has the most critical effect on the optimum performance improvement ratio of R1234yf with reference to constant pressure mixing assumption.

Documents disponibles

Format PDF

Pages : 211-225

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 : Impact of the mixing theories on the performance of ejector expansion refrigeration cycles for environmentally-friendly refrigerants.
  • Identifiant de la fiche : 30025359
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 97
  • Date d'édition : 01/2019
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2018.09.013

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