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Étude expérimentale d’un nouveau système frigorifique en cascade dont l’étage inférieur est un cycle de sublimation du CO2.

Experimental investigation of a novel cascade refrigeration system with a CO2 sublimation cycle as the lower stage.

Auteurs : XU Y., MICKOLEIT E., THOMAS C., JAGER A., BREITKOPF C., HESSE U.

Type d'article : Article de la RIF

Résumé

Some studies in recent years have shown the possibility of extending the application temperature of the natural refrigerant carbon dioxide (CO2) below its triple point. Thus, CO2 could be a potential alternative refrigerant for R-23 in ultralow-temperature (ULT) refrigeration systems. This paper introduces a special cascade system, whose lower stage can be switched between a CO2 sublimation cycle and a conventional R-23 cycle, so that both cycles can be compared directly under the same ambient conditions. The sublimation system features a unique sublimation heat exchanger, which allows the operation with an extra carrier fluid in order to improve the heat transfer and reduce the blockage by solid CO2. In this study, experiments were carried out using HFE-7500 as the carrier fluid (“wet sublimation”) as well as without the carrier fluid (“dry” sublimation). The system was able to be operated continuously in both operating mode. A refrigerating capacity of 600 W was achieved at a sublimation temperature of -79°C. The transient behavior and blocking issues of the system are discussed. The efficiency of the sublimation system during stable operations are compared with the result of the reference R-23 system. It shows that there is still large potential for improvement on the system performance of the CO2 sublimation system.

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Format PDF

Pages : 938-946

Disponible

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    20 €

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    Gratuit

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Détails

  • Titre original : Experimental investigation of a novel cascade refrigeration system with a CO2 sublimation cycle as the lower stage.
  • Identifiant de la fiche : 30029196
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 131
  • Date d'édition : 11/2021
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2021.07.001
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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