A closed-cycle gas turbine power plant use air as the working fluid . air is compressed in a compressor , heated in an air-heater .expanded in a gas turbine . and cooled in an air-cooler before it is compressed again and the cycle continues .
a) Identify the heat and work transfer interactions considering the air as the system .
b) If heat is supplied at the rate of 180 kW in the air-heater and rejected at the rate of 110 kW in the cooler. compute the net power output of the power plant. what is the efficiency ?
c) If the maximum cycle temperature ( at the heater exit ) is 1000 C and the minimum cycle temperature is 100 C ( at the cooler exit ) , what is the theoretical limit of the cycle efficiency?