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MECH 3020 Thermodynamics II: Homework set #7, Due 2/14
1. A simple Rankine cycle has a condenser pressure of 50 kPa. The temperature of the steam entering the
turbine is
T
3
= 500
◦
C. To prevent corrosion of the turbine blades by liquid water, the boiler pressure
is set so that the exit of the turbine is a saturated vapor at the condenser pressure.
(a) Assuming that the turbine and the pump are isentropic, calculate the boiler pressure, the net
work per unit mass, and the overall thermal eﬃciency of the cycle.
(b) Perform the same calculation, except now take the turbine to have an isentropic eﬃciency of
η
t
= 0
.
85. The pump can be assumed isentropic as before. Note: the solution procedure requires
iteration. You must guess a boiler pressure, and then work downstream to calculate the turbine
exit state. If you get a saturated vapor as the exit then you guessed correctly, otherwise reﬁne
your guess and iterate.
2. A proposal is now made to add a reheater to the basic setup of problem 1. The condenser pressure
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This note was uploaded on 09/24/2011 for the course MECH 3020 taught by Professor Mackowski during the Spring '11 term at Auburn University.
 Spring '11
 MACKOWSKI

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