Analysis of ammonia/water and ammonia/salt mixture absorption cycles for refrigeration purposes in fishing ships
Analysis of ammonia/water and ammonia/salt mixture absorption cycles for refrigeration purposes in fishing ships
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DOI：
10.1016/j.applthermaleng.2014.02.065
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发表时间：
2014-05
影响因子：
6.4
通讯作者：
F. Táboas;M. Bourouis;M. Vallès
中科院分区：
文献类型：
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作者：
F. Táboas;M. Bourouis;M. Vallès
本文分析了渔船柴油机水套水余热作为吸收式制冷系统热源的应用。对以氨为工质的三种不同工质混合的吸收式制冷循环进行了热力学模拟。根据蒸发器、冷凝器和发电机温度的函数，对冷却需求和循环性能进行了评估。结果表明，NH_3/（LiNO_3 + H_2O）和NH_3/LiNO_3流体混合物具有比NH_3/H_2O流体混合物更高的COP值，且在较低的发生温度下差异更明显。如果激活温度设定为85 °C，则在冷凝温度为25 °C时，NH3/LiNO 3循环可达到的最低蒸发温度为−18.8 °C，NH3/（LiNO 3 + H2O）循环为−17.5 °C，NH3/H2O循环为−13.7 °C。此外，对于NH3/（LiNO 3 + H2O）流体混合物，已经证明吸收式制冷循环可以在没有蒸馏塔的情况下操作，并且在这种情况下，在所选择的操作条件下，进入蒸发器的制冷剂流中的水含量小于1.5重量%。
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/LiNO3fluid 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.