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Caractéristiques de la membrane utilisée dans un absorbeur compact pour les refroidisseurs à absorption à bromure de lithium/eau.

Characteristics of the membrane utilized in a compact absorber for lithium bromide/water absorption chillers.

Auteurs : ALI A. H. H., SCHWERDT P.

Résumé

This study aims at investigating experimentally and analytically the characteristics and properties of a membrane contactor utilized to design compact absorbers for lithium bromide/water absorption chillers. The main focus of this study are the factors that influence the water vapour transfer flux into a lithium bromide/water solution in confined narrow channels under vacuum conditions, as well as the properties limits for utilization in compact absorber design. The results indicate that the desired membrane characteristics for this application are as follows: high permeability to water vapour, hydrophobic to the aqueous solution with high liquid entry pressure to avoid wettability of the membrane pores and no capillary condensation of water vapour to avoid blocking of the pores. For practical use, this membrane should have a thin hydrophobic microporous active layer with a thickness up to 60 micrometers, mean pore sizes around 0.45 micrometers and a porosity of up to 80%. The active layer should be attached to a porous support layer to meet the strength requirements needed for practical use in the absorber of lithium bromide/water absorption chillers.

Détails

  • Titre original : Characteristics of the membrane utilized in a compact absorber for lithium bromide/water absorption chillers.
  • Identifiant de la fiche : 2009-0600
  • Langues : Anglais
  • Source : 9th IEA Heat Pump Conference 2008: advances and prospects in technology, applications and markets. Conference proceedings [CD-ROM + abstracts].
  • Date d'édition : 20/05/2008

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