Civil Engineering Reference
In-Depth Information
Fig. 13 Balance of thermal energy production and consumption
considering that in the month with maximum excess it is removed only by adjusting
the ST panel production (q
ST
= q
ST initial
−
18m
2
.
As consequence of changing the ST panel surface, the heat excess was elimi-
nated as is shown in Fig.
13
, where in yellow is the ST panels
q
excess
). It results A
ST
¼
4
:
'
contribution.
ciency but also increase
the fuel consumption of the mCCHP system and therefore reduce the PES. These
observations are drawn from the comparison of data in Tables
13
and
14
.
Eliminated heat excess leads to increase the system ef
Table 14 Improving efficiency of the system
Month
System load
PV and ST panels load
Fuel
PES
(%)
EFF
(%)
e
sys
(kWh/
m
2
)
q
sys
(kWh/
m
2
)
e
PV
(kWh/
m
2
)
q
TP
(kWh/
m
2
)
q
fuel
(kWh/m
2
)
Jan
3.12
18.64
0.23
0.36
25.13
23.27
84.61
Feb
3.12
16.07
0.33
0.51
21.94
25.70
84.24
Mar
3.12
12.70
0.54
0.84
17.48
30.96
83.88
Apr
3.12
8.27
0.75
1.16
11.86
40.10
82.77
May
3.12
9.75
0.93
1.44
12.88
40.48
84.37
Jun
3.12
11.89
1.01
1.57
14.97
38.41
85.47
Jul
3.12
14.13
1.02
1.59
17.42
35.75
86.08
Aug
3.12
14.13
0.90
1.40
17.85
34.17
85.63
Sep
3.12
9.70
0.66
1.03
13.72
36.40
83.14
Oct
3.12
8.65
0.46
0.72
13.27
34.48
81.37
Nov
3.12
12.33
0.25
0.39
18.05
27.38
82.66
Dec
3.12
16.58
0.19
0.29
22.99
23.81
83.95
Total
37.42
152.84
7.26
11.30
207.57
32.58
84.02
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