gross cubic volume 20,150 m3, usable floor space 3,526 m2
Bundesanstalt für Immobilienaufgaben, Berlin/ Bundesamt für Bauwesen und Raumordnung, Berlin
Bollinger+Grohmann GmbH, Frankfurt
energy concept/ building services engineering
Solares Bauen GmbH, Freiburg i. Br.
Hagen Ingenieure für Brandschutz, Kleve
Wirtz International nv, Schoten, Belgien
For the new building for the Federal Office for Radiation Protection, we wanted to create a design that transforms the character of Karlshorst from an old barracks complex to that with an Arcadian scenery where workers and visitors feel comfortable and want to reside. The structural building concept maintains a CO2-neutral standard using little technology. Through a well-balanced soil management, the excavation on site remains unchanged and forms the base of the new topography.
Metasequoia – Landscape
Together with Peter Wirtz, Wirtz International, we developed the design of a nature-oriented park that naturally encloses the building. A thin forest of Metasequoia glyptostroboides (Chinese redwood) defines the outside space. The trees are bunched together in groups and integrated into a topography of curved, Ophiopogon japonicus planted islands. It creates a scenery of a ‚poetic’ and graceful landscape through the accumulation of plants, clear form and its seasonal change in color. The Garden, with its pathways, green spaces and lawns, is an optimal place to go for walks, to relax and for good conversation.
The use of building elements created using a high amount of energy is only used in necessary areas such as the foundation, the base plate or the ceilings. This has many significant economic and constructional advantages (acoustic, thermal storage, etc.). The differentiation between the building’s load-bearing structure and other building elements creates more flexibility and, through the separation of different building parts (long or short term), an optimal basis for the building’s life cycle. The intended use of the solid wood wall partitions (sandwich construction with a qualified structure) on the raised floor with a surface heating system improves the room climate and the longevity through the high amount of absorbability.
The building technology follows an intelligent energy concept. The solid ceilings made from cement are mostly left open and thereby used as a internal thermal storage – thus reducing temperature fluctuations and creating a comfortable room climate. The louvered windows on the upper part of the facade are used for nighttime ventilation and cooling. The user-friendly and efficient shading technology (Brise Soleil system, TLT elements with external sun protection) guarantees pleasant light and temperature conditions.
A geothermal probe system heats and cools the office areas within the building. The system consists of a field with 21 probes that optimally make use of the groundwater. A PV system on the roof with an output of 145 kWp supplies the building‘s entire energy demand. By using renewable energy systems along with the use of energy-saving technology, the primary energy demand is reduced to 100 kWh/m. The primary energy demand is fully supplied by the photovoltaic system on the building – thus creating a zero-emission building standard.
Rainwater is fully utilized through green roofs, rigole percolation and for watering the garden.