Basics in the

1
Basics in the Thermodynamic Analyses of the Gas
Turbine Power Plant
Prof. R. Shanthini Dept. of CP
Engineering University of Peradeniya
2
fuel
hot gases
CC
compressed air
C
GT
Gen
gases to the stack
atmospheric air
3
fuel
hot gases
CC
compressed air
C
GT
Gen
gases to the stack
atmospheric air
4
hot gases
CC
compressed air
3
2
C
GT
Gen
4
1
gases to the stack
atmospheric air
5
hot gases
CC
compressed air
3
2
C
GT
Gen
4
1
gases to the stack
atmospheric air
6
hot gases

3
GT
4
gases to the stack
7
hot gases

3

GT
4
Adiabatic Gas Turbine
gases to the stack
Kinetic energy change ignored
8
3

?
GT
T at the outlet
?
T at the inlet
4
Specific heat of gas at constant pressure
Mass flow rate of gas
9
3
?
changes
GT
fixed
fixed
?
4
free to choose, but we fix it at some value
10
3
?
should be as small as possible
GT
?
How small should T4 be ?
4
11
3
3
GT
real
P3
T
ideal
4
4s
P4
4
s
12
3
GT
4
13
Turbine Efficiency
3
GT
4
14
3
GT
4
15
Let s do some Excel sheet calculations on the
Turbine
16
?
88
T
Tinlet 1200 K Poutlet 1 bar
17
?
88
T
Tinlet 1200 K Poutlet 1 bar
18
fuel
hot gases
CC
compressed air
C
GT
Gen
gases to the stack
atmospheric air
19
hot gases
CC
compressed air
3
2
C
GT
Gen
4
1
gases to the stack
atmospheric air
20
hot gases
CC
compressed air
3
2
C
GT
Gen
4
1
gases to the stack
atmospheric air
21
compressed air
2
C
(WC)

in
1
atmospheric air
22
Adiabatic Compressor
compressed air
2
C
(WC)

in
1
atmospheric air
23
Adiabatic Compressor
Kinetic energy change ignored
compressed air
2
C
(WC)

in
1
atmospheric air
24
Adiabatic Compressor
Kinetic energy change ignored
compressed air
2
C
(WC)

in
1
atmospheric air
25
Adiabatic Compressor
Kinetic energy change ignored
compressed air
2
C
(WC)

in
1
atmospheric air
26
?
2
C
T at the inlet
1
T at the outlet
?
Specific heat of air at constant pressure
Mass flow rate of air
27
?
2
C
fixed
1
changes
?
fixed
free to choose, but we fix it at some value
28
?
2
C
should be as small as possible
1
?
How small should T2 be ?
29
2
3
C
T
P3P2
2
4
2s
real
4s
P4P1
1
ideal
1
s
30
?
2
C
1
?
?
31
Compressor efficiency
2
C
1
32
2
C
1
in
33
Let s do some excel sheet calculations on
the Compressor
34
?
85
C
Tinlet 300 K Pinlet 1 bar
35
?
85
C
Tinlet 300 K Pinlet 1 bar
36
fuel
hot gases
CC
compressed air
C
GT
Gen
gases to the stack
atmospheric air
37
Power available for electricity generation
38
Turbine Work Output
39
?
85
C
?
88
T
40
hot gases
CC
compressed air
3
2
C
GT
Gen
4
1
gases to the stack
atmospheric air
41
hot gases
CC
compressed air
3
2
C
GT
Gen
4
1
gases to the stack
atmospheric air
42
hot gases
CC
compressed air
3
2
/
/
- kinetic energy change ignored
- fuel flow rate ignored
43
?
80
CC
Net Work (in MW)
44
?
85
C
?
88
T
?
80
CC
45
Check the assumption of ignoring the fuel flow
rate
46
?
85
C
?
88
T
?
80
CC
47
hot gases
CC
compressed air
3
2
C
GT
Gen
4
1
gases to the stack
atmospheric air
Heat Loss?
48
Net Work (in MW)
49
hot gases
CC
compressed air
3
2
C
GT
Gen
4
Heat Loss
1
gases to the atmosphere through the stack
atmospheric air