Exergy/cost-based optimization of a hybrid plant including CAES system, heliostat solar field, and biomass-fired gas turbine cycle

This study explores the potential of integrating a compressed air energy storage (CAES) system, a heliostat solar field, and a biomass-driven gas turbine cycle to create an innovative cogeneration facility. The proposed system aims to deliver a dependable and eco-friendly energy solution by integrating the high energy density of CAES with the sustainable characteristics of solar and biomass resources . This study initially examines the influence of five design variables on key output parameters. Upon concluding this analysis, a bi-objective optimization is executed, concentrating on exergy round-trip efficiency and the levelized cost of the product as the primary objectives for optimization. As a realistic case study in this research, Tabriz city in Iran is selected and its solar and climatic conditions are applied in the analysis. The financial analysis reveals that the optimal scenario shortens the payback period from 6.479 years to 5.019 years and boosts net profit by 47.31 %. The optimal values of the objectives are a levelized cost of product of 0.07547 $/kWh and an exergy round-trip efficiency of 32.48 %. Therefore, the initial modeling produces 0.2376 tons of CO₂ for each MWh generated, whereas the emission for the optimized point is approximately 0.1696 ton/MWh. • Proposal of a novel hybrid plant including CAES system, heliostat solar field, and biomass-fired gas turbine cycle. • Using thermal energy storage to store hot air and use it to enter the gasifier during discharge time. • Bi-objective optimization for maximizing exergy round-trip efficiency and minimizing the levelized cost of the product. • Optimal scenario shortens the payback period from 6.479 to 5.019 years and boosts net profit by 47.31 %. • The optimal values of the levelized cost of product and exergy round-trip efficiency are 0.07547 $/kWh and 32.48 %.

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