A Brayton cycle with regeneration and air at 100 kPa as the working fluid operates on a

Question:

A Brayton cycle with regeneration and air at 100 kPa as the working fluid operates on a pressure ratio of 8. The minimum and maximum temperatures of the cycle are 300 and 1200 K. The adiabatic efficiencies of the turbine and the compressor are 80% and 82% respectively. The regenerator effectiveness is 65%. Determine
(a) Net work output per unit mass (wnet). Use the PG model.
(b) The thermal efficiency (ηth,Brayton)