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Analyse de cycles d'absorption de mélanges d'ammoniac/eau et d'ammoniac/sel pour les besoins de de froid des navires de pêche.

Analysis of ammonia/water and ammonia/salt mixture absorption cycles for refrigeration purposes in fishing ships.

Auteurs : TÁBOAS F., BOUROUIS M., VALLÈS M.

Type d'article : Article

Résumé

In this work, the use of waste heat energy of jacket water in diesel engines of fishing ships was analysed for use as a heat source for absorption refrigeration systems. The thermodynamic simulation of an absorption refrigeration cycle with three different working fluid mixtures that use ammonia as a refrigerant was carried out. This analysis was assessed in terms of the cooling demand and cycle performance as a function of the evaporator, condenser and generator temperatures. Moreover, the need for rectifying the vapour stream leaving the generator was analysed together with the drag of the fraction of non-evaporated liquid to the absorber. The results show that the NH3/(LiNO3 + H2O) and NH3/LiNO3 fluid mixtures have higher values of COP as compared to NH3/H2O fluid mixture, the differences being more pronounced at low generation temperatures. If the activation temperature is set to 85°C, the minimum evaporation temperatures that can be achieved are -18.8°C for the cycle with NH3/LiNO3, -17.5°C for the cycle with NH3/(LiNO3 + H2O) cycle and -13.7°C for the NH3/H2O cycle at a condensing temperature of 25°C. Also, for the NH3/(LiNO3 + H2O) fluid mixture, it has been demonstrated that the absorption refrigeration cycle can be operated without a distillation column and in this case the water content in the refrigerant stream entering the evaporator is less than 1.5% in weight at the operating conditions selected.

Détails

  • Titre original : Analysis of ammonia/water and ammonia/salt mixture absorption cycles for refrigeration purposes in fishing ships.
  • Identifiant de la fiche : 30011620
  • Langues : Anglais
  • Source : Applied Thermal Engineering - vol. 66 - n. 1-2
  • Date d'édition : 05/2014
  • DOI : http://dx.doi.org/10.1016/j.applthermaleng.2014.02.065

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