16.050 Thermal Energy
Problem Set #5– Fall 2002
Time spent on problems:
Problem 1:
Problem 2:
Problem 3:
Problem 4:
Problem 5:
Problem 6:
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View Full Document16.050 Thermal Energy
Problem Set #5 – Fall 2002
Do all problems. Please use a separate sheet of paper for each problem.
1.
Air is to be compressed from atmospheric pressure at 290 K to 7 atm in a centrifugal
compressor (isentropic efficiency about 0.70).
The flow rate will be 3.75 kg/s.
Specify the power requirement for the driving motor. You may assume the working
fluid is a perfect gas with cp=1 kJ/kgK.
2.
Air enters an adiabatic nozzle at 800 K and 140 kPa and emerges at 7 kPa. The
isentropic efficiency of the nozzle is known to be 0.96. Determine the discharge
velocity. Sketch the process on a
Ts
diagram and label the states. You may assume
the working fluid is a perfect gas with cp=1 kJ/kgK.
3.
An inventor has developed a method to run a Carnot cycle, as shown in the figure
below, between two temperatures,
T
H
and
T
L
. The rate of heat removed from the
high temperature source is
Q
±
H
. The only drawback is that there is a small leak so
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 Fall '02
 ZoltanSpakovszky
 Thermodynamics, Heat, Thermal Energy, Stagnation pressure, leaky Carnot cycle

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