Table 13.

The $S/N$ ratios and the weight factors calculated for the ${\eta }_{th}$, ${\eta }_{ex}$, ${\dot{C}}_{sys}$, and $C_{el}$.

Thermal efficiency (${\mathit{\eta }}_{\mathit{t}\mathit{h}}$)
Levels	A	B	C	D	E	F	G
1	−15.72	−17.92	−15.21	−17.16	−16.12	−16.30	−16.16
2	−15.75	−15.67	−16.17	−16.19	−16.21	−16.22	−16.16
3	−15.99	−14.94	−17.14	−15.18	−16.19	−16.01	−16.21
4	−16.50
5	−16.59
6	−16.50
$Delta$	0.87	2.98	1.93	1.98	0.09	0.29	0.05
$Rank$	4	1	3	2	6	5	7
$\sum Delta$	8.19
$w$ (%)	34.0
Exergy efficiency (${\mathit{\eta }}_{\mathit{e}\mathit{x}}$)
1	−4.50	−5.22	−3.98	−5.93	−4.88	−4.97	−4.94
2	−4.54	−4.81	−4.94	−4.95	−4.98	−4.92	−4.94
3	−4.76	−4.79	−5.91	−3.94	−4.97	−4.93	−4.95
4	−5.24
5	−5.36
6	−5.26
$Delta$	0.86	0.43	1.93	1.99	0.10	0.05	0.005
$Rank$	3	4	2	1	5	6	7
$\sum Delta$	5.37
$w$ (%)	22.3
Total cost of the system (${\dot{\mathit{C}}}_{\mathit{s}\mathit{y}\mathit{s}}$)
1	1.35	2.40	0.16	0.77	0.68	0.85	0.94
2	1.02	0.40	0.77	0.80	0.77	0.89	1.00
3	1.18	−0.37	1.49	0.84	0.97	0.68	0.48
4	0.81
5	0.07
6	0.54
$Delta$	1.42	2.77	1.33	0.07	0.29	0.21	0.51
$Rank$	2	1	3	7	5	6	4
$\sum Delta$	6.61
$w$ (%)	27.4
Unit cost of the electricity produced (${\mathit{C}}_{\mathit{e}\mathit{l}}$)
1	27.50	26.56	27.21	26.38	26.76	26.73	26.80
2	27.34	26.93	26.77	26.81	26.75	26.85	26.91
3	27.13	26.96	26.48	27.27	26.95	26.88	26.75
4	26.53
5	26.29
6	26.12
$Delta$	1.38	0.40	0.73	0.90	0.20	0.15	0.17
$Rank$	1	4	3	2	5	7	6
$\sum Delta$	3.93
$w$ (%)	16.3