A 100-hp, regenerative, Brayton-cycle gas turbine operates between a source at 840oC and the reference atmosphere at

Question:

A 100-hp, regenerative, Brayton-cycle gas turbine operates between a source at 840oC and the reference atmosphere at 21oC. Air enters the compressor at 21oC, 101 kPa. The air is then compressed to 345 kPa and then heated to 840oC. Part of this heating is accomplished in a regenerator whose effectiveness is 90%. Determine
(a) Work done by compressor and
(b) Work done by turbine. Use the PG model.
(c) The thermal efficiency (ηth,Brayton) of the cycle