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Recherche expérimentale sur le transfert de chaleur en ébullition libre de CO2 hors d’un tube horizontal.

[In Chinese. / En chinois.]

Auteurs : LIU S., LI L., NING J., et al.

Type d'article : Article

Résumé

The pool boiling heat transfer of natural refrigerant CO2 outside single horizontal tube is investigated experimentally under different boiling pressure. Smooth tube and enhanced tube (Turbo-EHP) are taken as the single horizontal tube with electrical heating. The relationship of boiling heat transfer coefficient along with the heat flux and the boiling pressure is analyzed, and the heat transfer correlation of smooth tube under heat flux of 10 ~ 50 kW / m2 and boiling pressure of 2 ~ 4 MPa is obtained. The maximum error is 8.73% when the experimental values are compared with fitting formula. Compared with other existing heat transfer correlations, the new fitting formula of CO2 is matching very well, and the maximum error is 15%. In the range of experimental heat flux and boiling pressure, the overall heat transfer coefficients of the enhanced tube are higher than that of the smooth tube, and its enhancement factors varies from 1.50 to 1.72. This paper makes useful exploration of CO2 pool boiling heat transfer and will benefit the design of evaporator.

Documents disponibles

Format PDF

Pages : 34-40

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : [In Chinese. / En chinois.]
  • Identifiant de la fiche : 30020622
  • Langues : Chinois
  • Source : Journal of Refrigeration - vol. 36 - n. 162
  • Date d'édition : 04/2015

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