It is well known and proven by experience that gas turbine performance decrease while atmospheric temperature increases. Basing on theoretical and experimental data, it is also known that atmospheric air relative humidity it is able to reduce power losses due to high external temperature. Moving from this consideration, it is possible to increase engine performance at high atmospheric temperatures using evaporative cooling technique. The present paper deals with the thermodynamic study of the performance of a syngas fed gas turbine with evaporative cooler into the compressor intake system from both a theoretical and experimental point of view. A mathematical model of the gas turbine has been developed using GateCycle code. Engine performance analysis at various values of atmospheric temperature, relative humidity and pressure has been carried out. Two control strategies of the artificial air humidifier have been implemented: the first is characterized by an air humidity constant at the intake of the compressor (set to 95 %); the second one is characterized by an air temperature constant at the intake of the compressor (set to the temperature corresponding to maximum IGV opening). Results analysis shows that using both of control strategies power and efficiency losses recovery could be achieved depending on atmospheric air humidity and temperature.
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