engines flows at the rate of
125 mol⋅s−1 into a waste-heat boiler where saturated steam is
generated at a pressure
of 1200 kPa. Water enters the boiler at 20°C (Tσ), 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 × 10−3 T/K. The steam flows into an adiabatic turbine
and exhausts at a
pressure of 25 kPa. If the turbine efficiency η is 72%,
(a) What is W
∙
S, the power output of the turbine?
(b) What is the thermodynamic efficiency of the boiler/turbine
combination?
(c) Determine S
∙
G for the boiler and for the turbine.
(d) Express W
∙
lost (boiler) and W
∙
lost (turbine) as fractions of ∣W
∙
ideal∣, the ideal work of
- 7 29 Exhaust Gas At 400 C And 1 Bar From Internal Combustion Engines Flows At The Rate Of 125 Mol S 1 Into A Waste Heat 1 (110.57 KiB) Viewed 70 times