Air enters the turbine of an Ericsson cycle at 1000 kPa and 1200 K, with a mass

Question:

Air enters the turbine of an Ericsson cycle at 1000 kPa and 1200 K, with a mass flow rate of 1 kg/s. The temperature and pressure at the inlet to the compressor are 250 K and 100 kPa respectively. Determine
(a) The net work output (wnet) per unit mass of air. Use the PG model.
(b) The thermal efficiency (ηth) of the cycle,