Partager

Document IIF

Comparaison des coefficients de transfert de chaleur pendant l'évaporation de frigorigènes naturels et de R1234yf à l'intérieur de tubes horizontaux de faible diamètre.

Comparison of heat transfer coefficient during evaporation of natural refrigerants and R1234yf in horizontal small tubes.

Numéro : pap. n. 236

Auteurs : OH J. T., CHOI K. I., SAITO K., et al.

Résumé

An experimental data comparison of evaporation heat transfer coefficient of R744(CO2), R717(NH3), R290(C3H8) and R1234yf in in horizontal small tubes was conducted under varying flow conditions. The experimental data were obtained over a heat flux range of 5 to 70 kW/m2, mass fluxes from 50 to 600 kg/m2.s, saturation temperatures from 0 to 15°C, and quality up to 1.0. The test section made of stainless steel tubes with inner diameters of 1.5 and 3.0 mm, the length of 1000 mm and 2000 mm each, was heated uniformly by applying an electric power to the tubes directly. Effects of mass flux, heat flux, saturation temperature and inner tube diameter on heat transfer coefficient are reported. Among the present working refrigerants, R744 has a highest heat transfer coefficient. Laminar flow was observed in the evaporative small tubes and considered in the modification of evaporation heat transfer coefficient correlations.

Documents disponibles

Format PDF

Pages : 10 p.

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 : Comparison of heat transfer coefficient during evaporation of natural refrigerants and R1234yf in horizontal small tubes.
  • Identifiant de la fiche : 30004541
  • Langues : Anglais
  • Source : 10th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2012). Proceedings. Delft, The Netherlands, June 25-27, 2012.
  • Date d'édition : 25/06/2012

Liens


Voir d'autres communications du même compte rendu (142)
Voir le compte rendu de la conférence

Indexation