Comparative exergetic, economic and exergoeconomic analyses of a hybrid cascade refrigeration system using ammonia-propane, propane-propylene and isobutane-propane refrigerant pairs

摘要

In the present study a comparative exergetic, economic and exergoeconomic analysis is done on a hybrid cascade refrigeration system using ammonia-propane, propane-propylene and isobutane-propane refrigerant pairs. Overall system cost rate, component-wise exergy destruction rates, exergetic efficiencies and exergoeconomic factors are investigated for the three refrigerant pairs at thermodynamic optimal operating conditions. The study concludes that ammonia-propane is the best refrigerant pair with maximum exergetic efficiency of 24.83 and minimum total cost rate of $564,469/yr, whereas isobutane-propane is thermodynamically superior but economically inferior than propane-propylene refrigerant pair.