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Performance d'un matelas dispersant dans un système frigorifique à absorption à ammoniac/eau.

Performance of a packed bed absorber for an aqua ammonia absorption refrigeration system.

Auteurs : SELIM A. M., ELSAYED M. M.

Type d'article : Article, Article de la RIF

Résumé

The model is used to predict the performance of the bed at various design and operating conditions. The governing equations and the boundary conditions are derived to predict the bed performance. A numerical integral method and an interaction scheme are used to solve the governing one dimensional, non-linear simultaneous differential equations which are subjected to three point boundary value problem. A computer program is prepared and carefully debugged to solve the governing equations with the help of some supporting equations to describe the properties of the working fluids and the heat and mass transfer coefficients in the bed. The analysis show that the absorption process is affected by the following parameters: the volumetric heat rejection model, bed height, vapour and solution flow rates to the bed and the inlet conditions; and packing material type. The effect of changing each of those parameters on the performance of the bed is studied after suggesting a model for the volumetric heat rejection from the bed. The results show that changing the bed pressure and/or the vapour inlet temperature have a negligible effect on the performance of the bed. Changing other parameters are found to affect the performance of the bed by different degrees. Also, the results show that within the present range of parameters, a bed height less than 0.7 meters guarantees an absorption efficiency better than 91%.

Documents disponibles

Format PDF

Pages : 283-292

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 : Performance of a packed bed absorber for an aqua ammonia absorption refrigeration system.
  • Identifiant de la fiche : 1999-2889
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 22 - n. 4
  • Date d'édition : 06/1999

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