The generated power and efficiency of gas turbine plants depend on the temperature of the inlet air. At high ambient temperatures, a power loss of more than 20%, combined with a significant increase in specific fuel consumption, compared to ISO standard conditions (15 C), can be observed.
The adverse effect of high ambient air temperatures on the power output of a gas turbine is twofold: as the temperature of the air increases, the air density and, consequently, the air mass flow decreases. The reduced air mass flow directly causes the gas turbine to produce less power output.
Also, the higher intake-air temperature results in an increase of the specific compressor work and, therefore, in a further reduction of the power output. Depending on the type of the gas turbine, the electric output will decrease by a percentage between 6% and more than 10% for every 10°C of intake-air temperature increase also there is a corresponding loss in the efficiency.
The straightforward conclusion from the above discussion is that at temperatures of 2535 °C, common in Southern part of the country specially Kerala and 20-45°C in the northern part of the country where a large number of gas turbines are used for electricity generation, there is a power loss of more than 20%, combined with a...