Problem Set 13, PS13 due Friday June 18
The power output of an adiabatic turbine is 8 MW.
Steam enters the turbine at 600
C, 6 MPa and 80 m/sec.
Steam leaves the turbine at 50 kPa, 100 C and 140 m/sec.
Determine a) the turbine steam mass flow rate, b) the isentropic efficiency of the turbine.
c) the entropy change in the expansion process.
PS131
6102
An air compressor has an adiabatic efficiency of 84%.
Air enters the compressor
at 100 kPa , 17 C and a negligible velocity.
Air leaves the compressor at 257 C and a
negligible velocity.
Determine a) the compressor exit pressure and b) the power input to
the compressor.
PS132
Consider the effect of varying the isentropic efficiency of an adiabatic nozzle from
80% to 100% on the nozzle exit temperature and pressure. Inlet conditions and the exit
velocity are held constant.
Air enters the nozzle at 60 psia, 1020 F and a low velocity.
Air leaves the nozzle at with a velocity of 800 ft.sec.
PS133
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697
(
)
kg
8.3
m
13.2
875.9
m
kJ/sec
8000
1000
1
2
140
2
80
2682.5
3658.4
m
kJ/sec
8000
2
V
h

2
V
h
m
W
m
W
2
V
h
2
V
h
BTU/lb
2495.26
h
2305.4
.9345
340.49
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 Summer '08
 Errington
 Kilogram, All wheel drive vehicles, R1 plasmid

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