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| Architect Juri Troy |
"Sunlighthouse" by Juri Troy Architects
Pressbaum, Austria
Text sent by Juri Troy Architects:
"The Velux
Sunlighthouse in Pressbaum near Vienna is the
first co²-neutral single-family-house in Austria. It was completed end of
October 2010. The project was launched about two years ago by the Velux company
as a part of their Pan European experiment, the so called “model home 2020”
project. The goal is to develop, build and analyze six different houses in five
European countries, each following its own approach to progressive and
sustainable building and living.
The challenge of
the Austrian model home was to create a house that taps the full potential of
the plot (like the wonderful views, exposure to the sunlight, maximum of
privacy between the existing houses, …) on one hand and to develop an energy
and ecology concept to erase the ecological footprint of the house within the
next thirty years on the other hand. What distinguishes this project from many
ambitious preceding projects is the need and wish to combine minimized
numerical values for energy efficiency with ambitious architecture.
Fortunately the
clients had chosen an anything but ideal plot for the Austrian model home. It
is a slender and long piece of land that declines towards a beautiful (but
shading) wood with high trees in the Southeast. The plot is flanked by a dense
hedge in the Northeast and a high wall in the Southwest. The two close situated
neighboring houses on both sides leave just a little scope for privacy in
between. The wonderful view to the lake which is situated in the valley in the
East can only be caught by getting a step deeper into the ground. In short: A
design concept that uses a maximum of the potential that the plot offers had to
be more than a lip service, if the ambitious targets were supposed to be
accomplished. This makes the results of the project even more precious as
affordable plots in a mountainous country like Austria rarely offer ideal
conditions.
The energy
concept of the building was developed in collaboration with the Danube
University of Krems. The building equipment includes a high performing heat
pump, 43 m² mono crystalline photovoltaic roof panels, 8 m² thermal solar panels for hot water and a
controlled air system with heat recovery. The heat insulation of the shell
surface of the house is optimized and the windows fulfill passive house
requirements. A (in Austria)
so far disregarded demand was to obtain a maximum of daylight to lower the
energy consume for artificial light. The reached daylight factor in every
single room is on average five times higher than the usual standard. The roof
and facade windows were strategically positioned to provide stunning views, to
maximize passive solar energy, to enable an optimal, natural ventilation during
summer time and to minimize the thermal losses during winter time. In fact the Sunlighthouse’s
total window area is equal to 42% of its floor area. Like the outside planking,
the interior fitting is made of spruce wood. To keep the wooden surface bright
and avoid darkening, it was treated with white pigmented natural oil.
All materials had
to be evaluated by their ecological qualities before they were authorized to
use. The Austrian Institute for Construction Biology and Ecology (IBO) also
benchmarked the co² valuation of every assembled material. Using locally grown
and processed wood as main material to optimize the co² values are
self-explanatory, but as the building is positioned in a hill it was also
necessary to use concrete for all the grounding construction elements. Instead
of ordinary Portland cement (which shows a quite poor co² balance)
blast-furmace-slag, a spin-off product from steel production with extremely low
co² output, was used to mix the
concrete. The applied insulation material is sheep wool and recycled cellulose.
In the
end the goal was accomplished. The Sunlighthouse will
produce more energy than the building and using of the house consumes,
which makes it a small “power station” and a beacon project for further
conscious and sustainable planning and building."
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