Abstract
Abstract A comprehensive exergetic, exergoeconomic and exergoenvironmental analyses of a turbojet engine are performed to determine how the hydrogen fuel usage affects the exergetic and exergoeconomic performances of the turbojet engine. The exergy efficiency of the engine reduces from 15.40 % to 14.33 % while the waste exergy rate increases from 22.31 GJ/h to 24.01 GJ/h. However, the high increase in the fuel cost rate and specific fuel exergy cost with the hydrogen fuel causes that the specific product exergy cost rises up from 134.69 US$/GJ to 355.11 US$/GJ. The environmental impact of CO2 decreases by 99.12 % while the environmental damage cost rate lessens by 112.16 % with hydrogen usage. In this regard, the environmental damage cost rate decreases from 322.50 US$/h to 2.85 US$/h. The exergoenvironmental cost rate is determined to be 869.64 US$/h for jet fuel while it is obtained to be 1429.32 US$/h for hydrogen fuel. In this case, the specific exergoenvironmental cost is calculated to be 214.08 US$/GJ for jet fuel and 355.82 US$/GJ for hydrogen fuel.
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