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An experimental study on the use of variable capacity two-stage compressors in transcritical carbon dioxide light commercial refrigerating systems.

Étude expérimentale de l’utilisation de compresseurs bi-étagés à puissance variable dans des systèmes frigorifiques commerciaux légers au dioxyde de carbone transcritique.

Auteurs : CARVALHO B.Y. K. de, MELO C., HORN-PEREIRA R.

Type d'article : Article, Article de la RIF

Résumé

This paper focuses on experimentally investigating different cycle architectures with two-stage variable capacity compressors for light commercial refrigeration CO 2 systems. A system with two-stage rotary compressor and intercooler was used as a baseline. Tests with an iHX showed the existence of a minimum stable/safe superheating. Proper superheating control ( > 3 K) with an iHX increases the COP by 12.9%, 16.0%, and 17.2% in the compressor frequencies of 45, 60 and 75 Hz, respectively. To prevent instability a capillary tube selected for the lowest frequency can be used, but it reduces performance by up to 15.5% at higher frequencies. A cycle with iHX, two-stage expansion and intermediate flash-gas bypass was also studied. This cycle provided an average increase in cooling capacity of 7.5%, and gains in COP of 15.5%, 18.4% and 18.1%, at 45, 60 and 75 Hz, respectively. Flash-gas bypass control showed little benefit to performance, but improved cooling capacity by up to 12.1% when compared to the cycle with an iHX.

Documents disponibles

Format PDF

Pages : 604-615

Disponible

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    15 €

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    Gratuit

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Détails

  • Titre original : An experimental study on the use of variable capacity two-stage compressors in transcritical carbon dioxide light commercial refrigerating systems.
  • Identifiant de la fiche : 30027026
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 106
  • Date d'édition : 10/2019
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2019.03.026

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