TITLE.PM5

GAS POWER CYCLES 673

dharm

\M-therm\Th13-5.pm5

123 4 5 6 7 8 9 10

0

4

8

12

16

20

24

28

32

36

40

44

48

Thermal efficiency (%)

Pressure ratio

t = 15.5°C

t = 815.5°C

1

3

Tu

rb

ine

an

d

co

mp

re

sso

re

ffic

ien

cie

s(%

)

100

95

90

85

80

75

70

Fig. 13.45. Effect of component efficiency.
Effect of compressor inlet temperature :
Refer Fig. 13.46 (on next page). With the decrease in the compressor inlet temperature
there is increase in thermal efficiency of the plant. Also the peaks of thermal efficiency occur at
high pressure ratios and the curves become flatter giving thermal efficiency over a wider pressure
ratio range.

123 4 5 6 7 8 9 10

8

12

16

20

24

28

Pressure ratio

Thermal efficiency (%)

t = 815.5°C 3

ηηcomp.= turbine= 0.8

4

–18°C

0°C

+18°C

+50°C

Fig. 13.46