Civil Engineering Reference
In-Depth Information
Table 34 Load sharing of the mCCHP system with thermally compression chiller
Month
System load
PV and ST panels load
CHP unit load
Boiler load
e
sys
(kWh/m
2
)
q
sys
(kWh/m
2
)
e
PV
(kWh/m
2
)
q
TP
(kWh/m
2
)
e
cg
(kWh/m
2
)
q
cg
(kWh/m
2
)
q
ad
(kWh/m
2
)
January
3.33
15.94
1.24
4.14
2.09
6.27
5.52
February
3.33
13.77
1.76
5.88
1.57
4.71
3.19
March
3.33
10.94
2.91
9.69
0.42
1.27
0.00
April
3.33
6.76
3.33
6.76
0.00
0.00
0.00
May
3.33
5.56
3.33
5.56
0.00
0.00
0.00
June
3.33
6.08
3.33
6.08
0.00
0.00
0.00
July
3.33
7.09
3.33
7.09
0.00
0.00
0.00
August
3.33
7.09
3.33
7.09
0.00
0.00
0.00
September
3.33
5.16
3.33
5.16
0.00
0.00
0.00
October
3.33
6.79
2.51
8.37
0.82
2.47
0.00
November
3.33
10.63
1.34
4.47
1.99
5.97
0.18
December
3.33
14.21
1.01
3.35
2.33
6.98
3.87
Total
40.00
110.00
39.31
130.98
9.23
27.68
12.77
7 Evaluation and Improving of the Structural Models
Performance
7.1 Indicators for Performance Evaluation at System Level
During system design, the ultimate goals of the load estimation were (a) sizing the
suppliers, so that they can support the estimated load, and (b) assess the perfor-
mance indicators for each structural model in order to eliminate the models less
ef
cient. The performance is evaluated using the following two indicators:
The
first indicator is Percentage of energy saving or Primary Energy Save (PES)
that refers basically to the percentage of fuel saved from the energy production
of the CCHP system compared to the same energy produced by the reference
system. Conventional, the reference system is the one, which produces heat and
power with ef
ciency reference values
ʷ
Href
and
ʷ
Eref
, respectively. PES is
calculated with relation [
21
]:
!
q
F
PES
¼
1
100
%
ð
62
Þ
e
sys
q
sys
g
Href
g
Eref
þ
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