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Architecture:
The new building for the company Geyssel in Köln-Ossendorf was completed in 1993.
In addition to the aesthetic and functional aspects, innovation and
environmental conservation were the top priorities.
The building, which was designed by Prof. Erich Schneider-Wessling,
comprises a 6 m high hall and an adjacent 3-storey office building; attached
to the office building is a round, meanwhile covered with plants, staircase
tower. Since 2002, the unused lift shaft in the tower has housed an extensive
installation.
(Art and construction)

It was also important to allow space for the building to grow in the future.
It is possible to extend the hall by several axes. The foundation of the office
building was designed to allow the construction of further storeys.
Innovation:
The ground floor is equipped with a holographic lighting system which was
specially designed at the Cologne Polytechnic (Prof. Dr. Gutjahr, Prof. Dr.
Müller). Depending on the amount of available daylight, the system provides
extra artificial light. In addition to the reduction in energy costs, the whole
space is illuminated in a reflection-free light (500-1000 Lux).
>>Due to its innovative daylight technology, the Geyssel office building
was added to the case studies list by the IEA, Task 21 "Daylighting in Buildings"
international energy agency for further observation and measuring.<<
(
information brochure with pictures, pdf)
(You can recognise the holographic glass from outside as the blue strips or the
light strip inside above the porch. The right-hand picture also shows the
connected ceiling reflectors.)
A further interesting detail, a liquid crystal disk, can be seen in our
conference room which borders the assembly hall; initially this disk is milky
and translucent but becomes clear when the power is turned on and allows the
clients a view of the machines production process.
Environmental conservation:
Our building is equipped with sun collectors for generating heat and
rainwater collection containers. The environmentally-friendly cellulose
insulation material "Isofloc" was used as heat insulation whilst the
courtyard was paved using a rainwater permeable material ("Geopor", RCL).
For more information about the lighting control system:
· Energy agency NRW (pdf)
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