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Abstract
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In this survey, first-law, second-law, and exergo-economic investigations are accomplished to recover the waste heat recovery of a two-shaft turbofan engine applying a supercritical carbon dioxide Brayton cycle. The efficacy of different operating parameters including the inlet temperature of the turbine, the pressure ratio of the compressor, and Mach number on the performance of the proposed system in terms of energy and exergy performance, exergy destruction rate, and annual levelized cost of investment have been examined. The outcomes indicate that the energy performance of the cycle is specified as 42.94%, and the second-law performance of the cycle is calculated as 85.88%. The results display that among the various components of the proposed system, the maximum amount of exergy destruction occurred in the low-pressure engine compressor and the fan. It is found that by increasing the inlet temperature of the high-pressure turbine, the first-law efficiency and the second-law efficiency of the proposed cycle decrease while the total cost rate and exergy destruction rate increase. Moreover, it is inferred that the thermodynamic efficiency of the system rises when the pressure ratio of the compressor and Mach number increase. The outcomes also demonstrate that concerning the capital costs and exergy destruction costs of components, the highest amount is obtained for high-pressure turbine and recuperator, respectively.
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