Partager

Sélection du fluide actif pour un système de refroidissement solaire à éjecteur sous des conditions variables de fonctionnement.

Working fluid selection for a solar driven ejector cooling system operating under variable conditions.

Numéro : pap. n. 191

Auteurs : VARGA S., LEBRE P. S., OLIVEIRA A. C.

Résumé

The three most important factors influencing the performance of an ejector are the working fluid, ejector geometry and operating conditions. In the present work, six low environmental impact working fluids were evaluated for their use in an ejector cooling system running on low temperature thermal energy, like solar thermal. The analysis was based on a numerical model applying the 1D constant pressure mixing theory. The model was validated with available literature data. Ejector cooling performance (entrainment ratio and COP) was assessed for generator, evaporator and condenser temperatures in the range of 80-120°C, 5-15°C and 25-40°C, respectively. It was concluded that isobutane (R600a) is a good choice for a refrigerant, due to its high COP and moderate operating pressures throughout the entire cycle. The results also indicate that the area ratio required for operating the ejector in critical mode, under variable generator and condenser conditions, varied in a significant range, regardless of the selected refrigerant. This clearly indicates the importance of a variable geometry ejector design to strengthen the position of ejector cooling systems among other refrigeration technologies.

Documents disponibles

Format PDF

Pages : 9 p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Working fluid selection for a solar driven ejector cooling system operating under variable conditions.
  • Identifiant de la fiche : 30005814
  • Langues : Anglais
  • Source : EuroSun 2012: solar energy for a brighter future. ISES-Europe solar conference. Conference proceedings: Rijeka, Croatia, 18-20 September 2012.
  • Date d'édition : 18/09/2012

Liens


Voir d'autres communications du même compte rendu (44)
Voir le compte rendu de la conférence

Indexation