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Diminution de la performance d'un condenseur multitubulaire lorsqu'on remplace le R22 par des mélanges zéotropiques. 2. Etude sur les effets de la résistance au transfert de masse.

Reasons for drop in shell-and-tube condenser performance when replacing R22 with zeotropic mixtures. 2. Investigation of mass transfer resistance effects.

Auteurs : KARLSSON T., VAMLING L.

Type d'article : Article, Article de la RIF

Résumé

Detailed calculations of condensation outside a column of horizontal smooth tubes have been carried out in order to investigate the influence of mass transfer resistance for a zeotropic refrigerant mixture. Diffusive transport is calculated locally in both phases. Calculation results show that mass transfer resistance in the gas phase reduces heat transfer by 10-20% for a binary mixture with a glide similar to that of R407C. The decrease in heat transfer due to poor mixing in the condensate is from 15 to 65% for the conditions investigated; the lower the duty, the greater the decrease. Results show that if assuming mixing in the condensate by diffusion only, the degrees of mixing and the duty dependency are similar to results in earlier work where calculations were matched to experimental data. Diffusion is likely to be the dominant mixing mechanism in the condensate, and the mixing is poor under certain conditions, which might explain the drop in condenser performance for some heat pump applications.

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Format PDF

Pages : 561-566

Disponible

  • Prix public

    20 €

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    Gratuit

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

Détails

  • Titre original : Reasons for drop in shell-and-tube condenser performance when replacing R22 with zeotropic mixtures. 2. Investigation of mass transfer resistance effects.
  • Identifiant de la fiche : 2004-2792
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 5
  • Date d'édition : 08/2004

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