In a gas turbine plant, air is compressed through a pressure ratio of 6:1 from 15C....

 

Transcribed Image Text:

In a gas turbine plant, air is compressed through a pressure ratio of 6:1 from 15°C. It is then heated to the maximum permissible temperature of 750°C and expanded in two stages each of expansion ratio v6, the air being reheated between the stages to 750°C. A heat exchanger allows the heating of the compressed gases through 75 per cent of the maximum range possible. Calculate : (i) The cycle efficiency (ü) The work ratio (iii) The work per kg of air. The isentropic efficiencies of the compressor and turbine are 0.8 and 0.85 respectively. Ans. (i) 32.75% ; (ii) 0.3852 ; (ii) 152 kJ/kg] In a gas turbine plant, air is compressed through a pressure ratio of 6:1 from 15°C. It is then heated to the maximum permissible temperature of 750°C and expanded in two stages each of expansion ratio v6, the air being reheated between the stages to 750°C. A heat exchanger allows the heating of the compressed gases through 75 per cent of the maximum range possible. Calculate : (i) The cycle efficiency (ü) The work ratio (iii) The work per kg of air. The isentropic efficiencies of the compressor and turbine are 0.8 and 0.85 respectively. Ans. (i) 32.75% ; (ii) 0.3852 ; (ii) 152 kJ/kg]