16
In resume, Table 1 presents the U-values and the thickness of the insulation applied in each part of the
building envelope.
Table 1. U-values and insulation thicknesses of each part of the building construction envelope
Construction Building Envelope
U-value, [W/Km
2
]
Insulation thickness, [mm]
Basement Floor
0.09
400
External Wall
0.18
190
Roof
0.09
390
Windows
0.82
3 panes
Energy saving technologies
The house heating and ventilation systems include a heat pump for space heating using a ground coupled
system, air heating and a solar system.
The dwelling is equipped with a mechanical ventilation (VP 18 compact) system
with heat recovery. It
provides a Ventilation rate in summer of 0.9l/sm2 and in winter is 0.09l/s m
2
.
To cover the excess demand
of DHW and to fed energy for the floor heating, the VP 18 system has incorporated a hot water tank of 180l
that is combined with a solar heating system Velux CLI U12 of 6.6 m
2
of collector orientated to south with a
25ºC of inclination. Something special for this project is that the solar panels are integrated into the roof
with Velux flashing system.
It gives a very beautiful outward appearance to the building, since solar panels
look like Velux skylights.
The heat pump is the same for space heating and DHW temperature but the set is different. The heat pump
for space heating has a COP of 3.4 and COP of the heat pump for DHW is 1.8.
The ground coupled heat-pump system (JPV 18) has 150m of tube of 20mm of diameter in the ground 1
meter deep. The system converts the energy of the earth into heat for the floor heating. The floor heating
is also provided with energy by the solar tank. Figure 18 describes the entire system.