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Study on high performance and compact absorber using small diameter heat exchanger tubes.

Etude sur un absorbeur compact à performance élevée utilisant des tubes de faible diamètre au niveau de l'échangeur de chaleur.

Auteurs : PHAN T. T., MOON C. G., KIM E. P., et al.

Résumé

The effect of tube diameter on heat and mass transfer characteristics of absorber in absorption chiller/heater using LiBr solution as a working fluid has been investigated by both of numerical and experimental studies. The diameter of the heat exchanger tube inside absorber was changed from 15.88 to 12.70 and 9.52 mm. In a numerical study, a model of vapour pressure drop inside the tube absorber based on commercial 20 RT absorption chiller/heater was performed. The effect of the tube diameter and the longitudinal pitch on vapour pressure drop across the heat exchanger tube bank inside the absorber have been investigated and it was found that vapour pressure drop decreases as the tube diameter and the longitudinal pitch increase. In an experimental study, the system includes a tube absorber, a generator, a solution distribution system and a cooling water system was set up. The experimental results show that the heat flux and mass flux increase as the solution flow rate and cooling water flow rate increase. In both study cases, the heat and mass transfer performance increases as tube diameter decreases. Among 3 different tube diameters, the smallest tube has highest heat and mass transfer performance.

Détails

  • Titre original : Study on high performance and compact absorber using small diameter heat exchanger tubes.
  • Identifiant de la fiche : 2007-0189
  • Langues : Anglais
  • Source : ACRA-2006. Proceedings of the 3rd Asian conference on refrigeration and air conditioning.
  • Date d'édition : 21/05/2006

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