Z E M C H 2 0 1 2 I n t e r n a t i o n a l C o n f e r e n c e
272
Produced energy
Solar panels
18571
kWh/year
Photovoltaic panels 20208
kWh/year
Energy need
DHW (no s.p.)
80
kWh/year
Heating
Cooling
10074
kWh/year PE
w
=27 kWh/m
2
year
4914
kWh/year PE
s =
13 kWh/m
2
year
Consumed energy
COP
3
3385
kWh/year
EER
2,6
1890
kWh/year
Sold electric energy
Photovoltaic panels 12930
kWh/year
Tab.1 Results for the estimation without sunspace
(DHW = Domestic Hot Water COP = Coefficient of Performance EER= Energy Efficiency Ratio)
From the simulation results it is possible to observe that in one year the house has the
possibility to use an high rate of energy produced by itself and save 12930 KWh.
In the second simulation, performed considering the free gains of the sunspace, the
model of the house was divided into two different thermal zones: the house and the
sunspace. The results of this simulation are shown in Tab.2.
Produced energy
Solar panels
18571 kWh/year
Photovoltaic panels 20208 kWh/year
Energy need
DHW (no s.p.)
80
kWh/year
Heating
8116
kWh/year PE
w
=21 kWh/m
2
year
Cooling
4158
kWh/year PE
s
=11 kWh/m
2
year
Consumed energy
COP
3
2732
kWh/year
EER
2,6
1600
kWh/year
Sold electric energy
Photovoltaic panels 14198 kWh/year
Tab 2 Results for the estimation with sunspace
(DHW = Domestic Hot Water COP = Coefficient of Performance EER= Energy Efficiency Ratio)
In this second estimation it is possible to see that the sunspace reduces the energy
demand of 6
kWh/m
2
year, from 27 to 21 kWh/m
2
year.
The energy saved in one year is
14928 KWh. As it is possible to note the behavior of the house is very interesting for
what concerns the energy consumption in both cases, considering or not the sunspace.
Surely the presence of the sunspace can give to the house more chance for what
concerns the low consumption of energy. In quantitative terms the sunspace contribution
is 1268 KWh/year.
In order to validate the mathematic model, the building was monitored in real conditions.
In particular using 12 temperature sensors put in the different rooms it was possible to
confirm the good behavior of the house. The range of temperature in the rooms of the
house is constant if it is compared with the minimum outside temperature or maximum;
as it is possible to see from the graph n.1 and 2 below.
