A small gas turbine engine that drives an air compressor is supplied from a large pipeline with ambustion gas at 420kPa and 1000K. The turbine exhaust pressure 105kPa. The gas flow rate is 3.0kg/s. Turbine isentropic efficiency is t=0.85. At the compressor inlet, the pressure and temperature of the air are 100kPa and 300K, respectively. The air flow rate is 10kg/s. Compressor isentropic efficiency is c=0.80. For air (compressor): a=1.4,Cp,a=1.005kJ/(kg.K); For combustion gas: s=1.333,Cp,g=1.148kJ/(kg.K)