Page 404 - Advanced thermodynamics for engineers
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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
T 3 ¼ T 2 þ εðT 5 T 2 Þ (17.27)
¼ T 2 ð1 εÞþ εT 5 (17.28)
1
¼ T 2 ð1 εÞþ εT 4 1 h T 1 (17.29)
s r
But
1
T 2 ¼ T 1 1 þ ðs r 1Þ (17.30)
h C
Giving
1 1
T 3 ¼ T 1 1 þ ðs r 1Þ ð1 εÞþ εg 1 h T 1 (17.31)
h C s r
The energy addition
q 34 ¼ c p T 4 T 3 (17.32)
