Eng 2210 – Thermodynamics
Homework Set #10 Solutions
Problem 8.49:
Problem Statement:
Water is the working fluid in an ideal regenerative Rankine cycle
with one closed feedwater heater.
The condensate leaving the feed water heater is a
saturated liquid, and the feedwater leaving the heater leaves at the same temperature as
the condensate that exits the feedwater heater.
Determine for the cycle:
a.
The rate of heat transfer to the working fluid passing through the steam generator, in
kJ per kg of steam entering the first-stage turbine.
b.
The thermal efficiency.
c.
The rate of heat transfer from the working fluid passing through the condenser to the
cooling water, in kJ per kg of steam entering the first-stage turbine.
T
1
= 480
˚C
Given Information:
P
1
= 10 MPa
P
2
= 0.7 MPa
P
3
= 6 kPa
Engineering Model
:
Each component is a Control Volume at steady state.
There is no
loss in heat or pressure between components.
All of the processes are internally
reversible except for the throttling process between 7 and 8 where h
7
= h
8
.
Kinetic and
potential energy effects are negligible.
Solution:

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