Abstract
In the present work, a novel multi-generation scheme based on solar energy and biomass direct-firing technology for simultaneous production of power, cooling, heating, and freshwater is proposed. The system comprises externally fired gas turbine, steam and organic Rankine cycle, single-effect absorption chiller, and multi-effect desalination. The proposed scheme also has the potential to burn natural gas as secondary fuel when biomass is not available. In further, a comprehensive study of the thermodynamic and economic behavior of the proposed system with consideration of both fuels (bagasse and natural gas) is performed. Based on energy and exergy analysis for the base case condition (Pratio = 4.84, T14 = 875 °c), the system with bagasse can achieve an exergy efficiency of 21.48% while total product cost rate is 77.31 $/h. Moreover, a parametric study is performed to achieve a better understanding of the system performance with respect to different cycle parameters. Finally, two different multi-objective optimization problems that maximize second law efficiency and net power output while minimizing total product cost rate are solved, and the Pareto fronts are illustrated. TOPSIS implementation reveals that the optimum solution has 0.2% higher exergy efficiency while total cost rate is lowered by 10% compared to the base case results.
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