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Effet des surfaces avancées sur les processus de transfert de chaleur et de masse dans un absorbeur tubulaire bullaire au NH3/LiN03 pour des cycles frigorifiques à absorption.

Effect of advanced surfaces on heat and mass transfer processes in a tubular bubble absorber with NH3/LiNO3 for absorption refrigeration cycles .

Numéro : pap. n. 227

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

Résumé

The objective of this paper is to analyse the effect of advanced surfaces on heat and mass transfer processes in a tubular bubble absorber using the ammonia/lithium nitrate mixture. An experimental test facility, initially built-up for experimental characterisation of plate heat exchangers as absorber, was used to study tubular bubble absorbers. The tubular bubble absorber was a double pipe tube heat exchanger; where the ammonia vapor and solution mixture flow in the central channel in cocurrent from bottom to up and the cooling water flows through the channel side in a counter-current configuration. The internal tube of the heat exchanger is made of aluminium with an OD of 8.0 mm and helical micro-fins inside. The absorber was tested with three tube lengths (1, 2 and 3 meters in series) and compared with previous results from a smooth tube to assess the effect of the advanced surfaces. Operating conditions of interest are those of ammonia-lithium nitrate absorption refrigeration cycles driven by low temperature heat sources. The experimental data showed that the advanced surfaces significantly increase the absorption rates in comparison with the smooth tube when increasing the solution mass flow. Values of the absorption mass flux with the advanced tubes were around 1.46 and 1.56 times higher than the values achieved with the smooth tube at solution mass flows of 40 and 50 kg.h-1, respectively.

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Pages : 8 p.

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Détails

  • Titre original : Effect of advanced surfaces on heat and mass transfer processes in a tubular bubble absorber with NH3/LiNO3 for absorption refrigeration cycles .
  • Identifiant de la fiche : 30004695
  • Langues : Anglais
  • Source : 10th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2012). Proceedings. Delft, The Netherlands, June 25-27, 2012.
  • Date d'édition : 25/06/2012

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