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    THERMOECONOMIC ANALYSIS OF COMBINED CYCLE POWER PLANTS
    (2023-12) Al-Dulaimi, Bashar Mohammed Majeed
    Integration of several power production technologies has shown promise in the search for effective and sustainable energy solutions. In this work, a unique power plant layout with three organic Rankine cycle (ORC) units and a Brayton cycle (GTC) is investigated. Utilizing a variety of heat sources and improving energy conversion efficiency are the goals of integrating these cycles. This study examines the performance analysis of the combined power plant via meticulous simulation. To clarify the complex interactions between the ORC units and the Brayton cycle, the simulation makes use of sophisticated thermodynamic models and fluid dynamics simulations. In Brayton cycle the gas turbine works by the energy generated by the burned fuel and this burned fuel will generate heat. This heat will be useful for boiled the water in Rankine cycle and generate the steam and generate the electricity. This combined cycle is simulated by software program energy equation solver (EES). Carefully considered is the impact of altering ambient conditions, pressure ratios, and turbine and compressor efficiency. the models' findings highlight the complex interaction between the cycles' efficiencies, possibilities for heat recovery, and overall efficiency of energy conversion. Energy economic analysis of the gas turbine system is a combustion system capable of generating a high amount of heat that can be used in more than one organic Rankine cycle to obtain the greatest thermal efficiency. the interplay of the ORC units and waste heat recovery from the exhaust of the gas turbine shows a synergy that improves energy extraction and conversion. in order to find the best operating circumstances, performance of the system and component efficiency are compared. generating the largest amount of electrical energy through the combine power plane, where the originality lies in making great use of the heat generated from the exhaust of the system. the gas turbine. The knowledge base on combined power cycle topologies and their potential to sharply increase energy efficiency is being added to by this research. The results highlight how crucial it is to choose appropriate operating settings and maximize component efficiencies in order to get the maximum degree of overall system performance. The findings from this simulation-based analysis provide insightful advice for creating creative and sustainable energy systems that take use of the synergies between diverse power production technologies as the world's energy needs continue to change. The results show the entry temperature significantly impacts a system's efficiency and exergy, with the worst case being 51°C with 38.5% energy efficiency and the best being 15°C with 40.01% efficiency. It also affects cycle occupancy, Brayton cycle occupancy, and electricity costs, with the worst case being 51? and the best being 15?. The pressure ratio also affects efficiency, with high-pressure ratios resulting higher efficiency. The cycle work net also affects the pressure ratio, with high-pressure ratios reducing total work and affecting Brayton cycle work. Compressor efficiency significantly impacts a system's overall efficiency, with the worst case being 70% with 35.5% energy efficiency. The best efficiency is achieved at 90%, with 41% exergy. The worst work is at 70%, with total work reaching 45 kJ. Electric energy costs increase with compressor efficiency, with the worst case at 90% and the best at 75%. The temperature of exhaust significantly impacts system efficiency, with 300 ? exhaust values resulting in 39.65% energy efficiency. The best efficiency is achieved at 210 ?, with an exergy of 38.3%. The cycle work net and electrical energy cost also affect efficiency. ?