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Document IIF

Résultats obtenus avec des systèmes frigorifiques au R744 utilisant des éjecteurs multiples et de la suralimentation liquide.

Experience with R744 refrigerating systems and implemented multi ejectors and liquid overfeed.

Numéro : pap. 1107

Auteurs : SCHOENENBERGER J.

Résumé

Two CO2 refrigerating systems with parallel compression and ejectors have been designed, installed and commissioned in 2014 in a Swiss supermarket. Additional components and measuring instruments are installed, so that different operation modes and control strategies can be investigated. Recorded data from the first year of operation are analyzed. Since the end of 2014, the systems are running in the ejector operation mode. The ejectors recover expansion work which normally is lost. The recovered work is applied to return liquid and vapour from the MT suction accumulator downstream of the MT evaporators back to the medium pressure receiver. Due to the liquid ejectors and the MT suction accumulators, the MT suction pressure of system A was raised from -8°C up to -2°C and of system B from -8°C up to -3°C. Further, the systems are equipped with an LT suction accumulator and two internal heat exchangers. Thereby, the LT suction pressure of system A and B was raised from -33°C up to -26°C. Switching from booster operation mode to ejector operation mode, the energy consumption of the systems has been reduced by 15 to 20%. Depending on the application, climatic region and the demand of the heat recovery, the annual energy efficiency improvement of ejector supported CO2 refrigerating systems compared to ordinary CO2 systems with parallel compression is between 15 to 25%.

Documents disponibles

Format PDF

Pages : 7 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 : Experience with R744 refrigerating systems and implemented multi ejectors and liquid overfeed.
  • Identifiant de la fiche : 30019077
  • 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.2016.1107

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