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Document IIF

Sublimation de la neige carbonique solide de CO2 pour le refroidissement à basses températures inférieures à -50 °C.

Sublimation of solid CO2 dry ice for cooling at low temperatures below -50°C.

Numéro : pap. 1145

Auteurs : RÖLLIG P., GERMANUS J.

Résumé

A research project of ILK Dresden will be presented. The natural substance carbon dioxide is used as working substance for special refrigeration applications in the temperature range below -50°C. For carbon dioxide the use of the sublimation (that means transition from solid to gaseous phase) is necessary, since the triple point is -56.6°C. The basic idea to reach low temperatures is to use the sublimation heat of dry ice in a similar manner like the evaporation in a usual compression refrigeration process. Two fundamental directions of development will be shown: 1. Sublimation of solid carbon dioxide in a surrounding gas phase: The cooling capacity is provided directly at the sublimator heat exchanger. Because of the relatively poor heat transfer in the gas phase for this sublimation, variant new technologies had to be developed in order to reach the best possible refrigeration performance. 2. Sublimation of solid carbon dioxide in a liquid: An advantageous heat transport is possible via the liquid phase. For this purpose a suitable fluid had to be found. This fluid must meet the requirements for optimal sublimation and refrigeration performance at low temperatures. Additionally this fluid must not be flammable.

Documents disponibles

Format PDF

Pages : 8

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 : Sublimation of solid CO2 dry ice for cooling at low temperatures below -50°C.
  • Identifiant de la fiche : 30023510
  • Langues : Anglais
  • Source : 13th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2018). Proceedings. Valencia, Spain, June 18-20th 2018.
  • Date d'édition : 18/06/2018
  • DOI : http://dx.doi.org/10.18462/iir.gl.2018.1145

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