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Caractéristiques du transfert de masse et de chaleur d'un absorbeur hélicoïdal utilisant du LiBr et des solutions de LiBr + LiI + LiNO3 + LiCl.

Heat and mass transfer characteristics of a helical absorber using LiBr and LiBr + LiI + LiNO3 + LiCl solutions.

Auteurs : YOON J. I., KWON O. K., MOON C. G., et al.

Type d'article : Article

Résumé

An experimental study was performed to investigate the heat and mass transfer performance in a falling film absorber of a small-sized absorption chiller/heater. The components of the chiller/heater were concentrically arranged in a cylindrical form with a low temperature generator, an absorber and an evaporator from the centre. The arrangement of such a helical-type heat exchanger makes the system more compact compared to a conventional one. As a working fluid, LiBr + LiI + LiNO3 + LiCl solution is used to get improved heat transfer effect. The heat and mass transfer coefficients of the helical absorber provide similar values compared with the data obtained for horizontal absorbers at similar solution flow rates. The heat and mass transfer coefficients of the solution increase as the solution flow rate per unit length increases. However, if the solution flow rate is larger than 0.03 kg/m.s, the heat and mass transfer increase is minimal. Thus, 0.03 kg/m.s is recommended as an optimal solution flow rate. The heat and mass flux performance of the solution shows the tendency of 2-5% increase compared with that of LiBr solution.

Détails

  • Titre original : Heat and mass transfer characteristics of a helical absorber using LiBr and LiBr + LiI + LiNO3 + LiCl solutions.
  • Identifiant de la fiche : 2006-0216
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 48 - n. 10
  • Date d'édition : 05/2005

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