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Document IIF

Effets de la diffusion sur la condensation des mélanges : influence du glissement de température sur la résistance au transfert de masse.

Diffusion effects on multicomponent condensation: influence of glide on mass transfer resistance.

Auteurs : KARLSSON T., VAMLING L.

Résumé

The influence of glide on mass transfer resistance effects is investigated theoretically for condensation of zeotropic mixtures on the outside of horizontal tube banks. Calculations for different compositions of R134a/R32, corresponding to different glides, were carried out to give a measure at what glide mass transfer effects can be apparent enough to be considered when designing multicomponent condensers. In the calculations, mass transfer by diffusion was considered in both phases, and together with a heat balance the rate of condensation was determined locally. Results for high duties show a significant influence of mass transfer resistance on heat transfer at glides higher than about 4 K. For part loads the influence is even greater. At a glide of 1 K there is already a significant decrease in the heat transfer rate. At a glide of 5.5 K, corresponding to the glide of R407C, the decrease in heat transfer rate is around 20% at high duty and as much as 75% at lower duty.

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Détails

  • Titre original : Diffusion effects on multicomponent condensation: influence of glide on mass transfer resistance.
  • Identifiant de la fiche : 2004-2129
  • Langues : Anglais
  • Source : 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Date d'édition : 17/08/2003

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