Steam enters a well insulated turbine and expands isentropically throughout. At an intermediate pressure, 20 percent of the mass is extracted for process heating and the remaining steam expands isentropically to 9 kPa. Inlet to turbine; P = 14 MPa, T = 560oC, h = 3486 kJ/kg, s =6.6kJ/(kgK)Intermediate state; h = 276kJ/kg Exit of turbine: P =9 kPa,hf=174 kJ\kg. hg=2574 kJ/kg, sf=0.6 kJ/(kgK) sg=8.1 kJ(kgK) If the flow rate of steam entering the turbine is 100 kg/s, then the work output (in MW) is 125.56

Steam enters a well insulated turbine and expands isentropically throu

1.	Steam enters a well insulated turbine and expands isentropically throughout. At an intermediate pressure, 20 percent of the mass is extracted for process heating and the remaining steam expands isentropically to 9 kPa. Inlet to turbine; P = 14 MPa, T = 560oC, h = 3486 kJ/kg, s =6.6kJ/(kgK)Intermediate state; h = 276kJ/kg Exit of turbine: P =9 kPa,hf=174 kJ\kg. hg=2574 kJ/kg, sf=0.6 kJ/(kgK) sg=8.1 kJ(kgK) If the flow rate of steam entering the turbine is 100 kg/s, then the work output (in MW) is 125.56
Answer» Steam enters a well insulated turbine and expands isentropically throughout. At an intermediate pressure, $20$ percent of the mass is extracted for process heating and the remaining steam expands isentropically to $9$ kPa. Inlet to turbine; P = $14$ MPa, T = $560^{o} C$ , h = $3486$ kJ/kg, s $= 6.6 k J / (k g K)$ Intermediate state; h = $276$ kJ/kg Exit of turbine: P $= 9$ kPa, $h_{f} = 174$ kJ\kg. $h_{g} = 2574$ kJ/kg, $s_{f} = 0.6$ kJ/(kgK) $s_{g} = 8.1$ kJ(kgK) If the flow rate of steam entering the turbine is $100$ kg/s, then the work output (in MW) is 125.56