Acombined  cycle is formed  by  a  gas  turbineand  an  organic  Rankine bottoming cycle. Steady-state operatingdata are labeled on the figure. Owing to internal irreversibilities,the  generator  electricity  output  is  95%  of  the  input  shaft  power.  Theregenerator preheats air entering the combustor. In the evaporator,hot exhaust gas from the  regenerator  vaporizes  the  bottoming  cycleworking  fluid.  For  each  of  twoworking fluids—propaneandRefrigerant22—specify  workable  ranges  for p8,  turbineinlet pressure, and T8, turbine inlet temperature; also determine turbineexit pressure p9. For each working fluid, investigate the influenceon net combined-cycle electricity production and  on  combined-cyclethermal  efficiency  of  varying p8, T8,  and  compressor  pressure ratio.Identify  the  bottoming  working  fluid  and  operating  conditions  withgreatest  net combined-cycle  electricity  production.  Repeat  for  greatestcombined-cycle  thermal efficiency.