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Comparaison des performances d'éjecteurs fixes avec ou sans générateur de tourbillons et d'éjecteurs régulables dans un système frigorifique au CO2.

A performance comparison of fixed ejectors with and without a swirl generator and controllable ejectors in a CO2 refrigeration system.

Numéro : pap. 1185

Auteurs : SMOLKA J., PALACZ M., HAIDA M., et al.

Résumé

This paper provides a performance comparison ejector technology to be installed in a CO2 supermarket refrigeration system. Namely, the fixed ejectors with and without swirl flow at the inlet of the motive and suction nozzles and the fixed and controllable ejectors equipped with convergent and convergent-divergent nozzles and were analysed. The Coefficient of Performance (COP) of the ejector-based refrigeration system is dependent on the design and control of the mass flow rate through this device. The literature suggests that one of the possible ejector efficiency improvements can be performed using a swirl generator at the inlet of the motive nozzle. Therefore, a swirl generator was simulated for different size CO2 ejectors under typical operating conditions in a supermarket and for a range of rotational speeds. In addition, the performance of a group of fixed ejectors working in parallel was compared with two controllable ejectors with a needle. To analyse the potential of the considered approaches, the device performance was numerically simulated using the validated Homogeneous Equilibrium Model (HEM) model for the same typical transcritical parameters. For all the fixed ejectors with and without the swirl generator, devices of various sizes were simulated and
compared with the corresponding controllable ejector performance at a few needle positions. For both ejector types, a global efficiency as a function of the mass flow rate was presented and discussed.

Documents disponibles

Format PDF

Pages : 8 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 : A performance comparison of fixed ejectors with and without a swirl generator and controllable ejectors in a CO2 refrigeration system.
  • Identifiant de la fiche : 30019197
  • Langues : Anglais
  • Source : 12th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2016). Proceedings. Édimbourg, United Kingdom, August 21st-24th 2016.
  • Date d'édition : 21/08/2016
  • DOI : http://dx.doi.org/10.18462/iir.gl.2016.1185

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