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

Author(s) : TÁBOAS F., BOUROUIS M., VALLÈS M.

Type of article: Article

Summary

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.

Details

  • Original title: Analysis of ammonia/water and ammonia/salt mixture absorption cycles for refrigeration purposes in fishing ships.
  • Record ID : 30011620
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 66 - n. 1-2
  • Publication date: 2014/05
  • DOI: http://dx.doi.org/10.1016/j.applthermaleng.2014.02.065

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