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Document IIF

Nouvelles mesures du transfert de chaleur lors de l'ébullition libre du dioxyde de carbone dans une large gamme de températures.

New measurements of pool boiling heat transfer for carbon dioxide in a wide temperature range.

Auteurs : KOTTHOFF S., CHANDRA U., GORENFLO D., et al.

Résumé

Measurements of pool boiling heat transfer from a horizontal 8 mm O.D. copper tube with sandblasted surface to carbon dioxide were performed. The saturation temperature was varied in a wide range, and experimental heat flux extended from high values (100 kW/m2) down to natural connection without bubble formation. The new results demonstrate that the high heat transfer coefficients measured for carbon dioxide in comparison to hydrocarbon or halocarbon refrigerants are mainly due to the fact that the application of carbon dioxide is mostly envisaged for conditions where reduced saturation pressure is higher than for common refrigerants. It is shown in the paper that the new results for carbon dioxide are in line with the (normalized) calculation method proposed in the VDI-Heat Atlas for all refrigerants.

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Pages : 2004-2

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Détails

  • Titre original : New measurements of pool boiling heat transfer for carbon dioxide in a wide temperature range.
  • Identifiant de la fiche : 2005-2488
  • Langues : Anglais
  • Sujet : Alternatives aux HFC
  • Source : Natural Working Fluids 2004: 6th IIR-Gustav Lorentzen Conference
  • Date d'édition : 01/08/2004

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