6 Multi-objective Performance Optimization of a Ribbed Solar …
87
Fig. 6.4 Effect of
inclination angle on flow
structures
Table 6.3 Taguchi S/N ratios for performance indexes
Number of test
Factors and their levels
Signal to noise (S/N) ratios
A
B
C
S/N (Nu)
S/N (f)
S/N (η)
1
4000
3
45°
32.25
39.53
8.24
2
4000
6
60°
31.70
37.70
7.08
3
4000
9
75°
31.98
36.22
6.86
4
4000
12
90°
32.26
35.13
6.78
5
8000
3
60°
34.65
40.15
5.53
6
8000
6
45°
36.23
39.22
6.80
7
8000
9
90°
36.32
38.53
6.65
8
8000
12
75°
36.52
37.37
6.47
9
12000
3
75°
36.69
40.70
4.64
10
12000
6
90°
37.58
39.91
5.27
11
12000
9
45°
39.09
38.64
6.35
12
12000
12
60°
39.04
38.05
6.11
13
16000
3
90°
38.45
41.69
4.52
14
16000
6
75°
39.38
41.04
5.23
15
16000
9
60°
39.92
39.49
5.26
16
16000
12
45°
40.92
38.01
5.77