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Coefficient de transfert de chaleur lors de l'évaporation de C3H8, NH3 et CO2 dans de petits tubes uniques circulaires.

Heat transfer coefficient during evaporation of C3H8, NH3 and CO2 in single circular small tubes.

Numéro : pap. ID: 457

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

Résumé

An experimental study of evaporation heat transfer coefficient in single circular small tubes was conducted for flow of C3H8, NH3 and CO2 under some various flow conditions. The test matrix encompasses the entire quality range from 0.0 to 1.0, mass fluxes from 50 to 600 kg/m2.s, heat fluxes from 5 to 60 kW/m2 and saturation temperatures from 0 to 10°C. The test section was made of circular stainless steel tubes with inner diameters of 1.5 and 3.0 mm, and a length of 2000 mm in horizontal orientation. The test section 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 in this study. Among the present working refrigerants, CO2 has a highest heat transfer coefficient. Laminar flow was observed in the evaporative small tubes and considered in the modification of boiling heat transfer coefficient and pressure drop correlations.

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Pages : 10 p.

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Détails

  • Titre original : Heat transfer coefficient during evaporation of C3H8, NH3 and CO2 in single circular small tubes.
  • Identifiant de la fiche : 30003070
  • Langues : Anglais
  • Source : Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Date d'édition : 21/08/2011

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