Abstract

In this work, four new architectures of two-stage expander organic flash cycles (EOFCs) based on ejector namely, ejector based EOFC (E-EOFC), ejector based high-pressure evaporation EOFC (EF1-EOFC), ejector based low-pressure evaporation EOFC (EF2-EOFC), and double ejectors based EOFC (DE-EOFC) are proposed and analyzed using exergy, exergoeconomic and exergoenvironmental methods. The thermodynamic, cost and environmental impact indicators of the suggested EOFCs are compared with those of the base EOFC. A performance comparison exhibits that the net power, energy, and exergy efficiencies are improved by 16.83%, 13.05%, and 10.99%, receptively in EF1-EOFC, E-EOFC and DE-EOFC relative to the base EOFC. EF2-EOFC gives the highest reduction in the total cost rate by 7.26% relative to the base EOFC and DE-EOFC with minimum increment in cost rate by 0.66% and a 0.95% improvement in the environmental impact rate relative to the base EOFC is recognized as the appropriate layout from the thermodynamic, economic and environmental impact aspects. In addition, non-dominated sorting genetic algorithm II (NSGA-II) and three decision-making methods are implemented to ascertain the maximum net power and minimum total cost and environmental impact rates of proposed cycles.

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