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    THERMODYNAMIC AND EXERGO-ECONOMIC ANALYSIS OF A COMBINED POWER PLANT ON GAS TURBINE CYCLE AND ORGANIC RANKINE CYCLE
    (2023-01) Kareem, Alaa Fadhil Kareem
    Organic Rankine cycles (ORCs) are a suitable approach to transform low-quality thermal energy into electricity. Additionally, the release of waste heat to the atmosphere from the exhaust gases produced during the top cycle of the energy conversion systems is avoided. The main objective of this work is to integrate the Taji gas station, which is in Baghdad, with the Rankine cycle and organic Rankine cycle to verify waste heat recovery to produce extra electricity and reduce emissions into the environment. Thermodynamic and exergo-economic assessment of the combined Brayton cycle-Rankine cycle/Organic Rankin cycle (GSO CC) system, considering the three objective functions of First and Second Law efficiencies and the total cost rates of the system, were applied. According to the findings, 258.2 MW of power is produced from the GSO CC system, whereas 167.3 MW of power is created for the Brayton cycle (BC) at the optimum operating condition. It was demonstrated that the overall energy and exergy efficiencies respectively are 44.37% and 42.87% for the GSO CC system, while they are 28.74% and 27.75% respectively for the Brayton cycle. Moreover, the GSO CC system is $9.03/MWh, whereas it is $8.24/MWh for BC. The results also indicate that the network of the GSO CC system decreases as the pressure ratio increases. Nonetheless, the GSO CC system’s efficiencies and costs increase with a rise in the pressure ratio until they reach a maximum and then decrease with further pressure ratio increases. The increase in the gas turbine inlet temperature and isentropic efficiency of the air compressor and gas turbine enhances the thermodynamic performance of the system; however, a further increase in these parameters increases the overall cost rates. ?