ISOVER Passivhaus Engl.

at meets the
economical demands.
ity and facilitates thermal bridge free
construction. Wood is therefore the
preferred material for building passive
houses. For the Christophorus
House, wood was combined with
high-quality insulation materials,
resulting in a thermal bridge free
construction of highest airtightness
and excellent passive house values.
The energy supply:
sustainable and costeffective.
Eight Duplex geothermal probes of
100 m length are used to exploit the
earth – both as a heat source and a
heat sink – for this building. During
the heating period, the heat pump
supplies the building with additional
warmth via the deep probes. In
summer, the same system is used for
cooling – with a minimum consumption
of energy. Distribution of the
cooling resp. heating medium in the
house is done via 560 m2 of heating/cooling
ceilings and floor elements.
An on-grid photovoltaic system
with a peak output of 9.8 kW
ensures that the power needed for
the heat pump resp. for operating
pumps and fans is largely supplied
in a CO2-neutral way.
The water concept:
self-cleaning and
economical.
The entire amount of greywater and
rainwater is cleaned with the help of
three biological sewage treatment
plants and recycled as service water
for flushing toilets, irrigating plants
and washing cars. In this way, the
consumption of potable water is
reduced to a minimum. Nearly 70 %
of the required hot water is generated
by the thermal solar system.
Annual space heating requirement (HWB)
acc. to PHPP: 14.00 kWh/m2a Heating demand acc. to PHPP: 14.00 W/m 2
Pressure test n50: 0.40 1/h
U-values of structural components:
External wall: 0.11 W/m 2 K Roof: 0.11 W/m 2 K
Cellar ceiling/floor: 0.13 W/m 2 K Glazing: 0.70 W/m 2 K
Uw total window: 0.79 W/m 2 K Acc. to PHI Certificate
The bottom line:
exemplary.
Compared to a conventional office
building, the Christophorus House
realizes primary energy savings of
approx. 275,000 kWh/a (average).
Heating and cooling is largely done
in a CO2-neutral way. Yearly reduction:
75 tons of CO2 compared with
conventional construction. All this is
achieved while providing a most
comfortable indoor climate: about
40-50 % air humidity and temperatures
of 21-23°C.
Planning: Dipl. Ing. Albert P. Böhm
and Mag. Helmut Frohnwieser
Developer: BBM (Procurement
Services of the MIVA). Contact:
Franz X. Kumpfmüller
ISOVER 111