THERMODYNAMICS ANALYSIS OF INTEGRATED COOLING SYSTEM FOR GAS TURBINE

Abstract

The Power output of a gas turbine is directly proportional to and limited by the mass floworate of compressed air available to it from the air compressor that provides highpressure air to the combustion chamberoof the gas turbine system. An air compressor has a fixed capacity for handling a volumetric flow rate of air. Even though the volumetric capacity of a compressor is fixed, the mass flow rate of air it delivers to the gas turbine changes with changes in ambient air temperature. This mass flow rate of air decreases with increase in ambient temperature because the air density decreases when air temperature increases. Therefore, the power output of a combustion turbine decreases below its rated capacity when there is an increase in ambient temperature so this paper deal with different inlet air cooling system incorporated in gas turbine. The objective of this study is to integrate two different cooling systems (evaporative cooling system and mechanical cooling system). Thermodynamics modeling is carried out and presented along with results showing influence of integrated cooling system on various performance parameter of gas turbine and their key benefits and drawbacks in relation to the environmental conditions. The integration of inlet air cooling system reduces the work required to compress the air and increases the net work output of gas turbine and also increases the overall efficiency of gas turbine. The simulation is also carried out by varying different parameters.