7 Mathematical Modelling of Solar Updraft Tower
109
2
4
6
8
1 0
0
20
40
60
80
100
120
140
160
180
Temperature at turbine inlet (without losses)
Temperature at turbine inlet (with losses)
Velocity at turbine inlet (without losses)
Velocity at turbine inlet (with losses)
Chimney radius (m)
Temperature at turbine inlet (
o
C)
10
15
20
25
30
35
40
45
50
55
60
Velocity at turbine inlet (ms
-1
)
Fig. 7.9 Variation of temperature and velocity at turbine inlet calculated on 21st June between
11:00 and 12:00 for both cases when chimney radius is varied
2
4
6
8
1 0
80
100
120
140
160
180
200
220
240
260
Power output (without losses)
Power output (with losses)
Overall Efficiency (without losses)
Overall Efficiency (with losses)
Chimney radius (m)
Power output (kW)
0.16
0.18
0.20
0.22
0.24
0.26
0.28
0.30
0.32
0.34
Overall Efficiency (%)
Fig. 7.10 Variation of power output and overall efficiency calculated on 21st June between 11:00
and 12:00 for both cases when chimney radius is varied