Class1 - Results and Experiences Page 51

Figure 53. Monitored data of annual DHW demands in the flats (last year data). Red = Average demand of the apartments, 10.7
kWh/m² year.

The analysis of the consumption frequency (Figure 54) confirms a stable trend in the distribution of data: in
both data sets: the 10 kWh/m²/year consumption class is the most significant (between 35% and 40% of
the flats are in this class), followed by the 15 kWh/m²/year.

Figure 54, Frequency of the monitored data of DHW demands: 3 years data and last year data

Electric Energy Demands

The monitored value of total electricity consumption consists of energy for ventilation, for lighting and for
electrical devices. A standard energy consumption of the ventilation system was calculated as described
above in METHODS and resulted in an annual consumption of 735-835 kWh/h depending on the size of the
apartments.
An overview of the total electric energy consumption for the 56 flats with 3 years data is shown in Figure
55. The consumption varies between about 1000 kWh/y and 4500 kWh/y, with an average value of about
2200 kWh/y.
Figure 56 shows that the frequency peak consumption class remains 2000 kWh/y both considering 3 years
and 1 year data, but considering the dataset with a higher number of flats (last year data) the second

10.7

0 1

2 3 4 5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

s
u

t
i
o

[
k
Wh

/y]

Anonimous houses

DHW Consumption (last year data)

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

10%

15%

20%

25%

30%

35%

40%

45%

.

F
r
e

F
r
e

c
y

Consumption Class

[kWh/m2/year]

DHW Consumption frequency

% 3 years
% last year
Cum.% 3 years
Cum.% last year