The aeroderivate gas turbines are widely used for power generation in the oil and\ngas industry. In offshore marine platforms, the aeroderivative gas turbines provide the energy\nrequired to drive mechanically compressors, pumps and electric generators. Therefore, the\nstudy of the performance of aeroderivate gas turbines based on a parametric analysis is\nrelevant to carry out a diagnostic of the engine, which can lead to operational as well as\npredictive and/or corrective maintenance actions. This work presents a methodology based\non the exergetic analysis to estimate the irrevesibilities and exergetic efficiencies of the main\ncomponents of a two-shaft aeroderivate gas turbine. The studied engine is the Solar Turbine\nMars 100, which is rated to provide 11.86 MW. In this engine, the air is compressed in an\naxial compressor achieving a pressure ratio of 17.7 relative to ambient conditions and a high\npressure turbine inlet temperature of 1220 �°C. Even if the thermal efficiency associated to\nthe pressure ratio of 17.7 is 1% lower than the maximum thermal efficiency, the irreversibilities related to this pressure ratio decrease approximately 1 GW with respect to\nirreversibilities of the optimal pressure ratio for the thermal efficiency. In addition, this paper\ncontributes to develop a mathematical model to estimate the high turbine inlet temperature\nas well as the pressure ratio of the low and high pressure turbines.
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