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Conception de géométries compactes à micro-échelle pour la désorption d'ammoniac-eau.

Design of compact microscale geometries for ammonia-water desorption.

Numéro : pap. n. 127

Auteurs : DELAHANTY J. C., GARIMELLA S., GARRABRANT M. A.

Résumé

This paper presents the development of two novel compact heat and mass exchange concepts for use as the desorber in small capacity ammonia-water absorption systems. Both concepts feature a counter-flow orientation of the vapor and solution streams, in which the generated vapor rises through small channels within the component, flowing past the heated ammonia-water solution. Heat input to the device is achieved by a hot coupling fluid, which flows through a microchannel array adjacent to the vapor/solution channels in a counter-flow orientation with the solution stream. This geometry leads to high solution-side heat transfer coefficients and low coupling fluid heat transfer resistances, enabling a significant reduction in component size. This arrangement is also found to produce high-purity ammonia vapor, which leads to reduced rectification loads and a higher coefficient of performance (COP) of the system compared to more conventional designs. Additionally, both designs can be configured to include an analyzer and rectification section, which leads to a more compact, integrated system package, and reduces external fluid connections and cost. A model of the coupled heat and mass exchange process associated with ammonia-water desorption in these concepts is developed. The proposed design is compact, scalable, versatile and easily mass-produced. This concept can also be extended for use in other multi-component heat and mass transfer applications.

Documents disponibles

Format PDF

Pages : 10 p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

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

Détails

  • Titre original : Design of compact microscale geometries for ammonia-water desorption.
  • Identifiant de la fiche : 30013669
  • Langues : Anglais
  • Source : International sorption heat pump conference (ISHPC2014), College Park, United States, March 31-April 2, 2014.
  • Date d'édition : 02/03/2014

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