Exhaust gas at 400°C and 1 bar from internal-combustion engines flows at the rate of 125 mol s¹ into a waste-heat boiler where saturated steam is generated at a pressure of 1200kPa. Water enters the boiler at 20°C (To), and the exhaust gases are cooled to within 10°C of the steam temperature. The heat capacity of the exhaust gases is Cp/R =3.34 + 1.12 x10-3 T/K. The steam flows into an adiabatic turbine and exhausts at a pressure of 25 kPa. If the turbine efficiency n is 72%, (a) What is Ws, the power output of the turbine? (b) What is the thermodynamic efficiency of the boiler/turbine combination? (c) Determine SG for the boiler and for the turbine. (d) Express W (boiler) and W (turbine) as fractions of I W.. J the ideal

Elements Of Electromagnetics
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Exhaust gas at 400°C and 1 bar from internal-combustion engines flows
at the rate of 125 mol-s¹ into a waste-heat boiler where saturated steam is
generated at a pressure of 1200kPa. Water enters the boiler at 20°C (To), and
the exhaust gases are cooled to within 10°C of the steam temperature. The heat
capacity of the exhaust gases is Cp /R =3.34 + 1.12 x10-³ T/K. The steam
flows into an adiabatic turbine and exhausts at a pressure of 25 kPa. If the
turbine efficiency n is 72%,
(a) What is Ws, the power output of the turbine?
(b) What is the thermodynamic efficiency of the boiler/turbine combination?
(c) Determine SG for the boiler and for the turbine.
(d) Express Wlost (boiler) and Wlost (turbine) as fractions of | Wideal ], the ideal
work of the process.
Transcribed Image Text:Exhaust gas at 400°C and 1 bar from internal-combustion engines flows at the rate of 125 mol-s¹ into a waste-heat boiler where saturated steam is generated at a pressure of 1200kPa. Water enters the boiler at 20°C (To), and the exhaust gases are cooled to within 10°C of the steam temperature. The heat capacity of the exhaust gases is Cp /R =3.34 + 1.12 x10-³ T/K. The steam flows into an adiabatic turbine and exhausts at a pressure of 25 kPa. If the turbine efficiency n is 72%, (a) What is Ws, the power output of the turbine? (b) What is the thermodynamic efficiency of the boiler/turbine combination? (c) Determine SG for the boiler and for the turbine. (d) Express Wlost (boiler) and Wlost (turbine) as fractions of | Wideal ], the ideal work of the process.
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