Question

In a gas turbine plant air at 10°C and 1.01 bar is compressed through a pressure ratio of 4:1.
In a heat exchanger and combustion chamber the air is heated to 700°C while its pressure
drops 0.14 bar. After expansion through the turbine the air passes through a heat exchanger,
which cools the air through, 75% of maximum range possible, while the pressure drops 0.14
bar, and the air is finally exhausted to atmosphere. The isentropic efficiency of the compressor
is 0.80 and that of turbine 0.85. Calculate the efficiency of the plant.