Page 145 - Advanced thermodynamics for engineers

6.3 EFFICIENCY OF COMBINED CYCLE INTERNALLY REVERSIBLE HEAT 131

140
140
Non-dimensional power 100 80
120
120
100
80
60
60
40
40
20
20
0 0 0.3
0.3 0.3
0.3 0.45
0.45 0.6 0.45
Temperature ratio
0.45
0.6 0.6
0.6 0.75
0.75 0.75
0.75
0.9
0.9 0.9 of low temperature
0.9
Temperature ratio
engine
1 engine
of high temperature
FIGURE 6.6
Variation of maximum work output with temperature ratio across the two engines.
T

.
Q .
T . Q
W
E H
T T’ W .
. E
Q
T . T’
W
E C
T Q .
.
Q

T

FIGURE 6.7
Combined cycle heat engine driving reversed heat engine.