Environmental Engineering Reference
In-Depth Information
Economic optimization can be divided into structures of economic, industrial,
sector and products.
Potential energy savings come from the adjustment of the energy-efficient
industry/sector/product replacing the energy-intensity industry/sector/product and
increasing its share.
Technical improvements could be taken as the direct method to improve energy
efficiency and save energy based on the manufacture/product level. It could be
shown as the following Formula ( 2.1 ):
þ
X E i
G i
X ie i
E G þ
E
G ¼
E R
G i
G
E R
G ¼
E R
G
e
¼
¼
ð
p i
Þþ
(2.1)
G
Where,
e
¼
Energy intensity or energy consumption per unit GDP
E
¼
Energy consumption
G
GDP
E G ¼
¼
Energy consumption of industrial sector
E R ¼
Energy consumption of residential sector
ie i ¼
Energy intensity of subsector i
pi
Share of subsector i's GDP relative to national GDP
From the decomposition of energy intensity, it can be determined that three
factors can affect energy intensity: the energy intensity or energy efficiency level of
individual subsectors, GDP share of individual sectors and residential energy
consumption status.
Among these, energy intensity or energy efficiency level could be the technical
improvement factor and the GDP share of the individual sector could be taken as the
structural factor.
For the industrial sector, potential energy-savings could be analyzed by the
following formula:
¼
E m ¼
G ðÞ
ie ð 0
ie ð t
Δ
X n
i
¼
P m ð t
ð
pe mi
Þ 0
ð
pe mi
Þ t
¼
1
X n
i ¼ 1
(2.2)
þ
v m ð 0 ie ð 0 pe mi
ð
Þ 0
ð
pe mi
Þ t
ð
pe mi
Þ 0
X n
i ¼ 1
þ
ie ð 0
v m ð t
v m ð 0
ð
pe mi
Þ t
Where,
Δ
E m refers to the energy-savings of industry m
G m refers to GDP of individual industry m
ie m refers to energy intensity of individual industry m
P mi refers to the production of product type i of individual industry m
pe mi refers to per unit energy consumption of product type i of individual industry m
v mi refers to the embodied GDP of product type i of individual industry m
t refers to the forecast year
0 refers to the base year
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