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Document IIF

Effets combinés de la sélection et de la condensation en écoulement d’un fluide sur le fonctionnement d’un éjecteur dans un refroidisseur à base d’éjecteur.

Combined effects of fluid selection and flow condensation on ejector operation in an ejector-based chiller.

Auteurs : LITTLE A. B., GARIMELLA S., DIPRETE J. P.

Type d'article : Article, Article de la RIF

Résumé

This work investigates the optimization of the coefficient of performance of an ejector-based chiller through changes in the two-phase flow characteristics inside the ejector using wet R134a and dry R245fa fluids. Reducing the superheat at the motive nozzle inlet results in a 12–13% increase in COP with a 14–16?K drop in driving waste heat temperature. The roles of momentum transfer, heat transfer, and two-phase flow on performance are delineated. The change in COP appears to be a combination of the choice of fluid and the effect of phase change on momentum transfer effectiveness. Larger degrees of condensation reduce momentum transfer effectiveness; however, energy savings from reduced motive superheating compensates for the effect of condensation, and causes a net increase in COP. It is recommended that ejector-based chillers be operated such that the motive nozzle inlet is near saturation, and dry fluids like R245fa are used to improve performance.

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Format PDF

Pages : 1-16

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

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Détails

  • Titre original : Combined effects of fluid selection and flow condensation on ejector operation in an ejector-based chiller.
  • Identifiant de la fiche : 30018386
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 69
  • Date d'édition : 09/2016

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