ZEMCH 2019 International Conference Proceedings April.2020 | Page 155
15
10
gas
5
elec
15
0
cooling
heating
10
dhw
5
lighting
fan
0
1
2
3
4
5
6
7
8
9 10 11 12
1 2 3 4 5 6 7 8 9 10 11 12
appliance
(a) by energy sources (b) by end‐uses
Figure 2. Monthly energy consumption of bldg01
6
gas
4
elec
2
0
8
8 cooling
6 heating
4 dhw
lighting
2
fan
0
1
2
3
4
5
6
7
8
9 10 11 12
1 2 3 4 5 6 7 8 9 10 11 12
appliance
(a) by energy sources (b) by end‐uses
Figure 3. Monthly energy consumption of bldg02.
Note that in bldg02, the measurement began in February. The main features are the large amount
of electricity used for cooling (35% of the total energy), and the very low gas consumption in winter. It
can be assumed that bldg02 is a cooling load dominant building due to the considerable internal heat
gains. One of the special features is that fan energy increases rapidly in the summer, while fan energy
consumption remains very low in the winter. In other words, it can be assumed that the operation of
CAV and FCU is insignificant in winter. It is speculated that significant internal heat gains affect winter
operations. The domestic hot water use is relatively high in November and December.
3. Validation Results
Table 2 below shows the validation results (Diff.). The average difference between experiment 1
and experiment 3 is approximately 19% (bldg01) and 18% (bldg02), respectively. The average difference
between experiment 2 and experiment 3 is approximately 13% (bldg01) and 14% (bldg02), respectively.
The overall error for Eb, Eh, and Ec are 16.5%, 17%, and 7%, respectively. Considering that these are
estimated from the minimum basic information (monthly bill information), this appears to be a
meaningful result.
As an algorithmic feature, both experiment 1 and experiment 2 overestimated the overall Eb
(approximately 14– 28%). As the Eb is overestimated, it is underestimated by approximately 11–25%
for Eh and 6–13% for Ec.
Table 2. Disaggregation results (unit in kWh/㎡).
ID Indicators
bldg01 Eh
Ec
Eb
Total
Eh
Ec
bldg02
Exp1
31.4
26.1
42.8
100.2
4.5
20.4
Exp2
32.8
27.5
39.8
100.2
4.7
21.3
Exp3
36.7
30.1
33.4
100.2
6.0
22.7
Diff1.
(Exp1 vs. 3)
15%
13%
(‐)28%
0%
25%
10%
Disaggregation of weather-sensitive and -insensitive energy usage using monthly utility bill data
Diff2.
(Exp2 vs. 3)
11%
8%
(‐)19%
0%
23%
6%
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