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22
VP 18
Compact
is equipped with
a ground coupled heat pump
Nilan JVP, which extracts the energy stored
in the ground and converts it into heat for the under floor heating in winter time. The ground pipes are
placed one meter under the soil to avoid risk of frost.
In addition is a PV system of 6kWp (50m
2
) orientated towards south with an inclination of 45ºC.
For more information, see deliverable 4
3.3. Prefabricated social housing
Sixty-five ultra-low energy apartments were constructed in 2008 and 2009 in the new housing settlement
Stenloese South as part of the Class1 project. The design and construction of these houses and the results
of the monitoring of the energy consumption are presented below.
Design and construction

The 65 apartments were designed and constructed with an annually heating requirement of
15 kWh/m². This means very well insulated houses with the following U-values shown in Table 3.
Table 3. U- values related to the thickness of insulation applied in each part of the building envelope.
Construction Building Envelope
U-value[W/Km
2
]
Insulation thickness [mm]
Roof:
0,08
450
Wall:
0,12
400
Floor:
0,10
400
Windows:
0,9
Triple glazed
All dwellings are equipped with a mechanical ventilation system with heat recovery and an electronic
system for energy monitoring and control of the heating systems. The first houses were occupied in 2008.
The dwellings are heated by district heating.

The design called for prefabrication of the housing body, so each apartment is constructed of room-size
building blocks assembled on site and thereafter the external finishing was made on site. Internally only the
assembling lines had to be concealed. Below Figure 25 shows the prefabricated blocks being mounted,
Figure 26 presents one of the floor plans, Figure 27 the site plan and Figure 28 a photo of a finished block.