Civil Engineering Reference
In-Depth Information
Table 19.4 Examples of case studies
Economic evaluation
parameters
Annual energy saving Annual cost saving
Investment life Investment
Q el
Q th
C pel Q el C pth Q th
PAYBACK
IRR
Description of case studies
Section
MWh/year TOE/year
kU/year
Year
kU
Year
%
5 a
High-efficiency transformer
5.4
4.6
0.0
0.5
0.0
12
10.95
1.40
200 a
High-efficiency boiler
6.12
0.0
165.21
0.0
26.4
10
7.56
4.5
Power factor control
7.7
Table 7.2 , Case 4
35.2
0.0
3.5
0.0
10
15
4.26
42.70
Table 7.3 , Case 4
8.8
0.0
0.9
0.0
10
5
5.69
26.50
125 a
Microwave instead of thermal dryer
7.7
48
113
4.8
18.1
10
11.3
1
High-efficiency electric motor
7.7
11.4
0.0
1.1
0.0
10
3
2.63
36.30
Wall insulation
8.5
0.0
23.0
0.0
3.7
10
4
1.09
92.00
Pipeline insulation
8.5
0.0
154.5
0.0
24.7
10
8
0.32
309.00
Cogeneration b
Steam turbine
9.7
6,000.0
705
428.1
10
1,200
2.8
34
Gas turbine
9.7
6,000.0
764
387.7
10
1,300
3.35
27
Reciprocating engine
9.7
6,000.0
628
409.6
10
1,000
2.4
40
Trigeneration b
Reciprocating engine
1,229
9.7
7,176.0
431.2
10
1,100
2.8
34
Non-dissipative pump regulation
10.6
20.5
0.0
2.0
0.0
10
5
2.44
39.50
Air compressor plant
11.7
Pressure reduction
95.5
0.0
9.6
0.0
10
25
2.62
36.50
Heat recovery
0.0
18.1
0.0
2.9
10
10
3.45
26.10
(continued)
 
 
 
 
 
 
 
 
 
 
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