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The current work is a study of electricity, hydrogen, and freshwater polygeneration system fueled by biomass fuel. Accordingly, innovative integration of a Rankine cycle, a multi-effect desalination, and a solid oxide electrolyzer cell has been considered utilizing a syngas production biomass combustion chamber. The waste heat and a part of the output electricity of the Rankine cycle have been employed to launch the desalination and electrolyzer units, respectively. The suggested polygeneration is analyzed from the thermodynamic and exergoeconomic viewpoints through developing a code in engineering equation solver software and a multi-criteria optimization via MATLAB software. Hence, the NSGA-II optimization method and decision-making TOPSIS technique have been implemented. The parametric study has been conducted based on the effect of biomass fuel mass flow rate, turbine inlet pressure, combustion chamber outlet temperature, and pinch point temperature difference of the steam generator on the thermodynamic and exergoeconomic variables of the whole system. Considering the total exergy destruction rate, exergy efficiency, and total unit exergy cost of products as objective functions, the suggested system achieved the optimum values of 17.64%, 7658.5 kW , and 26 $ / GJ corresponding for these variables. • An integrated cycle for power, freshwater, and hydrogen is devised. • Comprehensive energy, exergy, exergoeconomic analyses are performed. • Multi-objective optimization is developed for the optimization process. • For the optimization scenario, 17.16%, 7658.5 kW, and 26 $/GJ for exergy efficiency, exergy destruction, and unit exergy cost were obtained. [ABSTRACT FROM AUTHOR]

A novel power and freshwater generation system is presented based on the gas turbine cycle as the main system and Kalina cycle and humidification-dehumidification desalination unit as the waste heat recovery subsystems. To evaluate the system's performance, energy, exergy, economic, and environmental analysis is performed. The optimum performance of all optimization scenarios is found by applying the multi-objective genetic algorithm and using the technique for order of preference by similarity to ideal solution (TOPSIS) method. The sensitivity analysis is also performed to assess the effect of various parameters on the system's performance. By using Net present value, the feasibility of the plant for the construction from the economic viewpoint is analyzed. Based on the base case results, the performance metrics are evaluated as the energy efficiency of 0.9398 , exergy efficiency of 43.11 % , sum unit cost of 19.44 $. GJ − 1 , Levelized total emission of 63571 kg. kW − 1 , and freshwater production rate of 10.39 kg. s − 1 . Among all system components, the combustion chamber is contributed to the highest rate of exergy destruction rate by 16544 kJ. s − 1 . For fuel cost of 3 $. GJ − 1 and electricity price of 0.09 $. kWh − 1 , the total net present value for the plant lifetime is obtained 1.736 × 10 7 $ , which means that the plant is feasible for construction from the economic perspective. Based on the optimization results, the maximum value of exergy efficiency and minimum value of Levelized total emission are obtained in LTE-ε-TGOR scenario by 43.84 % and 62602 kg. kW − 1 , respectively. • A novel power and water production system based on gas turbine cycle is proposed. • Thermodynamic, economic, and environmental analyses are performed. • Payback period and net present value techniques are employed for economic analysis. • Multi-objective genetic algorithm is used to optimize the performances of the system. • TOPSIS decision-making method is applied to find the final optimum solutions. [ABSTRACT FROM AUTHOR]