Environmental Engineering Reference
In-Depth Information
For the case under consideration, the Sustainability Index Q(q,ω) will lead
to the following mathematical function
ik
Q
w q
(1)
i
1
where
ω
i
weighting factor for the n-th criterion
q
i
i-th criterion for sustainability assessment.
2.5.
R
ESILIENCE
I
NDEX FOR
E
NERGY
S
YSTEM
The
Resilience Index is integral of the Sustainability Index between the
time of the sudden change in the respective indicator and the
time when it
resumes
a steady state value
(
see figure 2
)
. The resilience index for an energy
system is composed of the following elements: economic, environmental,
technological and social.
tt
ik
1
R
w
100
q dt
j
i
i
i
1
tt
(2)
0
where
j
- resilience
index
q
i
-indicator
w
i
- weight coefficient
The resilience index is composed of sub-indicators. In the same way the
economic,
environmental, technological and social resilience element could be
obtained, as follows. Under
assumption that the sudden indicator change
resumes is a linear function of time, then we can write
1
2
R
w
q
t
j
i
i
(3)
