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Caractérisation des performances d'une pompe à bulles pour les machines frigorifiques à absorption de vapeur

Performance characterization of a bubble pump for vapor absorption refrigeration systems.

Auteurs : AMAN J., HENSHAW P., TING D. S. K.

Type d'article : Article, Article de la RIF

Résumé

A thermally driven bubble pump has been used for an ammonia (refrigerant)–water (absorbent) vapor absorption refrigeration (VAR) system, which is known as a diffusion absorption refrigeration (DAR) system since the 1920s. However, the use of a bubble pump in a water-based refrigerant VAR system has not been reported. In a bubble pump-operated VAR system, the cycle performance as well as the bubble pump performance completely depend on the refrigerant–absorbent solution properties and the bubble pump parameters. Although a few analytical models have been developed for the performance analysis of a bubble pump-operated refrigeration cycle, the analytical model of the bubble pump itself has not been reported. In this study, a dimensional analysis was performed, considering bubble pump geometry and the solution properties, and a mathematical model was developed to represent the bubble pump performance in terms of non-dimensional numbers, which can be used in all bubble pump driven absorption refrigeration systems. The analysis revealed that the bubble pump always operates in a turbulent condition with a Reynolds number higher than 104 and a Morton number between 10-11 and 10-12. The highest efficiency of the bubble pump (79 %) is achieved at a high liquid Froude number at the beginning of the slug flow regime, when the non-dimensional pressure is low. The proposed analytical model was validated with the experimental results conducted with pure water and an LiCl-H2O solution and both results agreed within 12 %.

Documents disponibles

Format PDF

Pages : 58-69

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 characterization of a bubble pump for vapor absorption refrigeration systems.
  • Identifiant de la fiche : 30022745
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 85
  • Date d'édition : 01/2018
  • DOI : http://dx.doi.org/0.1016/j.ijrefrig.2017.09.011

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