advanced building skins 14 | 15 June 2012 - lamp.tugraz.at - Graz ...

Advanced Building Skins
index of comfort is in the uncritical range of -0.3 to + 0.3. Based on the results of the simulation and
under the aspect of the status as an architectural monument, the designers developed a renovation
concept. This concept is based on an altered concept A which contains ideas of concept B for special
areas.
All opaque areas with insulation get a mineral plaster, which imitates the originally plaster in its optic.
To save the appearance, a variable thickness of insulation around the building was used. The areas of
entrance and the gable wall get an insulation of EPS with a thickness of 14 cm. Thus, the windows can
be placed into the layer of insulation and the originally depth of the reveals can be preserved. The
facade with the balconies is isolated with a high quality and expensive “Resol”-hard foam with a
thickness of 8 cm. This minimizes the change of the geometry of the building. The entrance element
remains in the original style. The filigree steel profile construction of the staircase has to be preserved.
Therefore, corroded parts must be derusted and repaired. To carry the new insulation glazing, the steel
profiles had to be reinforced with additional steel profiles on the inside. The whole facade must be
placed flush with the new insulated external wall.
In the area of the balconies the ends of the balustrades and the partition walls have to be shortened in
the thickness of the insulated composite system. All windows must be replaced but the color, profiles
and geometry should be the same as in the original windows. The single glazing of the entrance is
replaced by a triple glazing and profiles with greater dimensions. The Blumenfenster remain in their
original type. Only the outer pane is replaced by an insulated glazing. Figure 8 shows the view of the
balconies before and after the renovation. The major difference is the color of the parapets, which was
changed to the original color.
Before renovation After renovation
Figure 8: Comparison – Blumenfenster before and after energy-oriented renovation.
To realize the ventilation concept apertures were installed in the frame of the outer pane of the
Blumenfenster. So, the outside air is heated in the space between the two layers of the Blumenfenster,
flows into the room and is removed through the chimney.
2.4 Results
During the renovation of the residential estate “Schillerpark”, one flat was modified to the renovation
concept under supervision of the Technische Universität Dresden. Especially the ventilation concept
was under investigation, because it has a great influence on the thermal behavior of the building. With
the help of a Blower-Door-Test, the air flow inside the flat was investigated. The emphasis was
primarily on the inflow in the area of the Blumenfenster. The test also was used to validate the
simulations of thermal comfort which are shown in figure 9.
- 7 -