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Mélanges dioxyde de carbone/HFC en tant que fluides actifs dans la partie basse température des systèmes frigorifiques en cascade.

Blends of carbon dioxide and HFCs as working fluids for the low-temperature circuit in cascade refrigerating systems.

Auteurs : DI NICOLA G., GIULIANI G., POLONARA F., et al.

Type d'article : Article, Article de la RIF

Résumé

This paper describes an analysis on the performances of a cascade refrigeration cycle operated with blends of carbon dioxide (CO2, or R744) and hydrofluorocarbons (HFC) as the low-temperature working fluid. The aim of this work was to study the possibility of using carbon dioxide mixtures in those applications where temperatures below CO2 triple point (216.58 K) are needed. The analysis was carried out by developing a software based on the Carnahan-Starling-De Santis (CSD) equation of state using binary interaction parameters derived from our experimental data. The properties of the investigated blends (R744/R125, R744/R41, R744/R32, R744/R23) were used to simulate the behaviour of a cascade cycle using ammonia (R717) as the high-temperature-circuit working fluid and operating at evaporating temperatures down to -70 °C. The use of a suction-liquid heat exchanger on the low-temperature side of the circuit was also investigated. Results show that the R744 blends are an attractive option for the low-temperature circuit of cascade systems operating at temperatures approaching 200 K.

Documents disponibles

Format PDF

Pages : 130-140

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 : Blends of carbon dioxide and HFCs as working fluids for the low-temperature circuit in cascade refrigerating systems.
  • Identifiant de la fiche : 2005-1683
  • Langues : Anglais
  • Sujet : Alternatives aux HFC
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 28 - n. 2
  • Date d'édition : 03/2005

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