Page 287 - Materials Chemistry, Second Edition

13.3 Case study 285
TABLE 13.8 The global weights of the eight criteria for sustainability assessment of electricity
generation systems
Local weights Global weights
Economic ([0.1643 0.4375]) EC 1 [0.3000 0.5000] [0.0493 0.2188]

EC 2 [0.5000 0.7000] [0.0822 0.3062]
EN 1 [0.3673 0.4255] [0.1607 0.3024]
Environmental ([0.4375 0.7107]) EN 2 [0.3673 0.4255] [0.1607 0.3024]

EN 3 [0.1036 0.1836] [0.0453 0.1305]
EN 4 [0.0235 0.1035] [0.0103 0.0736]
Social ([0.1019 0.1481]) S 1 [0.6667 0.7619] [0.0679 0.1128]

S 2 [0.2381 0.3333] [0.0243 0.0494]

calculating the product of the data with respect to the evaluation criterion in the normalized
decision-making and the interval weight of the evaluation criteria. For instance, the data
of cell (1,1) in the weighted normalized decision-making matrix can be determined
by Eq. (13.45) (using the data of the coal-based electricity generation system with respect
to EC 1 to multiply with the global weight of EC 1 ). In a similar way, all the data in the
weighted normalized decision-making matrix can be determined, and the results are
presented in Table 13.9. The ideal solutions with respect to each evaluation criterion can
be determined.
(13.45)
½ 0:2860 2:2190Š 0:0493 0:2188½ Š ¼ 0:0141 0:4855½ Š
Then, the following programming was established to determine the most sustainable
electricity generation system:

TABLE 13.9 The weighted normalized decision-making matrix.
Coal Oil Biomass Ocean Wind Ideal solutions
[0.0141 0.4855] [0.0362 0.1609] [0.0089 0.1169] [0.0104 0.0917] [0.0177 0.2390] 0.4855
EC 1
[0.0482 0.6208] [0.0539 0.2009] [0.0279 0.3252] [0.0158 0.0915] [0.0235 0.2927] 0.6208
EC 2
[0.0018 0.0048] [0.0218 0.1129] [0.0062 0.2656] [0.0480 0.5644] [0.0436 0.5644] 0.5644
EN 1
[0.0014 0.0416] [0.0022 0.0146] [0.0193 0.1456] [0.3868 0.7279] [0.0516 0.5823] 0.7279
EN 2
[0.0006 0.0032] [0.0007 0.0054] [0.0051 0.1610] [0.1118 0.3220] [0.0140 0.1610] 0.3220
EN 3
EN 4 [0.0004 0.0151] [0.0010 0.0301] [0.0004 0.0215] [0.0211 0.1506] [0.0053 0.1506] 0.1506
S 1 [0.0274 0.0639] [0.0615 0.1151] [0.0716 0.1267] [0.0769 0.1291] [0.0777 0.1293] 0.1293
S 2 [0.0249 0.0507] [0.0249 0.0507] [0.0249 0.0507] [0.0205 0.0467] [0.0225 0.0482] 0.0507