Partager

Document IIF

Dioxyde de carbone : études sur le transfert de chaleur lors de l'évaporation et sur la chute de pression au voisinage du point critique.

Studies on the evaporative heat transfer and pressure drop of carbon dioxide near the critical point.

Auteurs : YOON S. H., CHO E. S., KIM M. S., et al.

Résumé

In recent years, carbon dioxide has gained considerable attention as an alternative refrigerant due to its excellent thermophysical properties. Many investigations of carbon dioxide as a refrigerant have included a thermodynamic cycle analysis. However, few investigations have been performed to measure heat transfer coefficients and pressure drop during evaporation of carbon dioxide. This study is aiming at providing the characteristics of heat transfer and pressure drop during the evaporation process by experiments. The test section was made of a seamless stainless steel tube with the inner diameter of 7.53 mm, and length of 5.0 m. Experiments were conducted at saturation temperatures of -4 to 20 °C, heat fluxes of 12 to 20 kW/m2 and mass fluxes of 200 to 530 kg/m2s with direct heating method. The existing correlations generally underpredicted the heat transfer coefficients and overpredicted the pressure drop. Based on the experiments for evaporation heat transfer and pressure drop, new correlations were developed in the study. Empirical correlations for the heat transfer and pressure drop have an average absolute deviation of 15.3 and 16.2% respectively.

Documents disponibles

Format PDF

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 : Studies on the evaporative heat transfer and pressure drop of carbon dioxide near the critical point.
  • Identifiant de la fiche : 2004-2706
  • Langues : Anglais
  • Source : 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Date d'édition : 17/08/2003

Liens


Voir d'autres communications du même compte rendu (398)
Voir le compte rendu de la conférence

Indexation