Page 403 - Advanced Thermodynamics for Engineers, Second Edition

394 CHAPTER 17 GAS TURBINES

FIGURE 17.13
Maximum
Tes diagram for gas turbine cycle with reheat and heat temperature 3 5
Temperature, T Q 1 4 Q 2
exchange.

2’ 6

Heat
exchange

2
6’
Q 3

p 1
i
Entropy, S

T 3 T 2
ε ¼
T 5 T 2
Hence

(17.27)
T 3 ¼ T 2 þ εðT 5 T 2 Þ
¼ T 2 ð1 εÞþ εT 5 (17.28)

1
T (17.29)
¼ T 2 ð1 εÞþ εT 4 1 h 1
s r
But

1
(17.30)
T 2 ¼ T 1 1 þ ðs r 1Þ
C
h
Giving

1 1
T 3 ¼ T 1 (17.31)
T 1
ðs r 1Þ ð1 εÞþ εg 1 h
1 þ
h C s r
The energy addition

(17.32)
q 34 ¼ c p T 4 T 3