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Thermodynamics Assignment 02
Name: Dilshan K.M.G.L.
Index Number: 150131A
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Question 1
A steam power plant operates between a boiler pressure of 40 bar and a condenser pressure of 0.04 bar.
Calculate the cycle efficiency, work ratio and specific stream consumption for
I. Carnot cycle
P
1
= P
2
= 40 bar = 4000 kPa
P
4
= P
3
= 0.04 bar = 4 kPa
T
1
= T
2
= 250.35℃ = 523.5 K
T
3
= T
4
= 28.96℃ = 302.11 K
h
1
= h
f @40 bar
= 1087.4 kJ/kg
h
2
= h
g @40 bar
= 2800.8 kJ/kg
h
f @0.04 bar
= 121.39 kJ/kg
h
fg @0.04 bar
= 2432.3 kJ/kg
s
1
= s
4
= s
f @40 bar
= 2.7966 kJ/kg.K
s
2
= s
3
= s
g @40 bar
= 6.0696 kJ/kg.K
s
f @0.04 bar
= 0.4224 kJ/kg.K
s
fg @0.04 bar
= 8.0510 kJ/kg.K
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Turbine work
Compressor work
Heat transfer in the boiler
Heat transfer in the condenser
Net-work for the cycle
![](https://csdnimg.cn/release/download_crawler_static/27856191/bg4.jpg)
Cycle efficiency
Or
Work ratio
Specific steam consumption
![](https://csdnimg.cn/release/download_crawler_static/27856191/bg5.jpg)
II. Simple Rankine cycle
P
1
= 40 bar = 4000 kPa
P
2
= 0.04 bar = 4 kPa
h
1
= h
g @40 bar
= 2800.8 kJ/kg
h
3
= h
f @0.04 bar
= 121.29 kJ/kg
Turbine work
Feed pump work