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Effet de surfaces innovantes sur le processus d'absorption de l'ammoniac avec NH3/LiNO3 dans un absorbeur tubulaire à bulles.

Effect of advanced surfaces on the ammonia absorption process with NH3/LiNO3 in a tubular bubble absorber.

Auteurs : AMARIS C., BOUROUIS M., VALLÈS M.

Type d'article : Article

Résumé

An experimental study was conducted to investigate the effect of advanced surfaces on the ammonia absorption process in tubular bubble absorbers using NH3/LiNO3 as a working pair at operating conditions of interest for absorption chillers. The tubular bubble absorber is a vertical double-pipe heat exchanger in which absorption takes place in the inner tube. In order to compare the effect of surface enhancement, a smooth tube and an internally micro-finned tube were tested. The inner tube of the absorber is made of aluminium and has an outer diameter of 8.0 mm and the micro-finned tube has internal helical micro-fins measuring 0.3 mm in length. The effect of tube length on absorption was also studied using two tube lengths (1 and 3 m) and two tube diameters (8 and 9.5 mm). Our results show that the absorption rate achieved with the micro-finned tube is up to 1.7 times higher than with the smooth tube at a solution mass flow rate of 40 kg h-1. We also found that absorption mass flux increases when tube diameter is reduced and decreases when tube length is increased.

Détails

  • Titre original : Effect of advanced surfaces on the ammonia absorption process with NH3/LiNO3 in a tubular bubble absorber.
  • Identifiant de la fiche : 30010494
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 72
  • Date d'édition : 05/2014
  • DOI : http://dx.doi.org/10.1016/j.ijheatmasstransfer.2014.01.031

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