Civil Engineering Reference
In-Depth Information
3.2.4 Case Study: Provehallen
The retrofit of Provehallen (Copenhagen) included the following actions:
• refurbishment of the building envelope components to decrease the U-value, by
means of the facade and roof insulation, and the installation of high-efficiency
windows,
• installation of a PV plant and a PV/T solar collector, which is cooled by a heat
pump to increase the efficiency of the PVs,
• installation of a high-efficiency HVAC system.
Figure
5
compares GER to total energy saving, while Fig.
6
shows the con-
tribution to GER of each retrofit phase. The building insulation and the low-e
windows have the highest contribution to GER and the lowest energy saving,
compared to the other retrofit actions. The efficient HVAC system provides the
lowest GER (1 %) and the highest energy saving. Based on the results of the
energy and environmental analyses of the case study, the retrofit of the building
envelope provides a yearly saving of primary energy of 151 GJ/y and a direct heat
saving of 126 GJ/y. In particular, the insulation of the building envelope, made
with mineral wool boards, led to a primary energy savings of 65 GJ/y, while the
introduction of low-e windows involves a primary energy saving of 86 GJ/y.
Taken into account a total floor area of 2,300 m
2
, the primary energy saving was
28 MJ/(m
2
y) and 37.5 MJ/(m
2
y), respectively. Installation of the PV/T solar col-
lector saved 302 GJ/y (131 MJ/(m
2
y)). The high-efficiency HVAC system pro-
vided a primary energy saving of 2,113 GJ/y (919 MJ/(m
2
y)).
3.2.5 Case Study: Stuttgart
Renovation of the Nursery Home (Stuttgart) involved the following actions:
• insulation of the envelope opaque elements and high-efficiency windows (low-e
glasses) to reduce the thermal losses,
Fig. 5 GER compared to the
total energy saving in
Provehallen case study
Case study: Provehallen
18,000
PV/Thermal collectors
Building insulation
Low-e windows
HVAC system
16,000
14,000
12,000
10,000
8,000
6,000
4,000
2,000
-
0
500
1,000
1,500
2,000
GER [GJ]
