Kulturwerk am See & Musikschule, Norderstedt, Allemagne
The Landesgartenschau Schleswig-Holstein 2011 offered the opportunity to convert a disused former sand-lime brick factory into a cultural and event centre. Transsolar took on the task of developing a climate concept that was tailored to the existing buildings and their use as an event venue. An important goal was to achieve a high level of user comfort in the rooms without high energy consumption for ventilation, heating and cooling.
Norderstedt's climate offers very good conditions for natural ventilation. An existing creep cellar, converted into an earth channel register, now conditions the supply air, which enters the two event halls through displacement air outlets in the grandstands, benches and stage area. A 20 m high exhaust chimney generates the drive for this. The natural ventilation is only mechanically supported when there is no wind and high outside temperatures. A radiative ceiling heating system heats the rooms in winter and cools them in summer by operating them with groundwater from a well.
Adjacent to the converted factory building, a new building was constructed for the local music school with classrooms and rehearsal rooms, a dance and movement room and a cafeteria in the foyer.
All classrooms and rehearsal rooms in the new building are naturally ventilated. The ventilation via the windows is supported by exhaust air openings in the elevated attic area on the roof of the open staircase. Between the classrooms and the traffic areas there are sound-insulated overflow openings. Only the rooms for band samples in the basement are mechanically ventilated with decentralised ventilation units with heat recovery. Natural night air cooling removes thermal loads from the building and ensures that the rooms do not overheat in summer.
The double façade is separated by storeys and rooms. The inner shell consists of heat insulation glass, while in the visible façade horizontally turned sand-lime bricks and single glass panes alternate with a sun protection system arranged in the space between them. The characteristic perforation of the sand-lime bricks and the air openings above and below the glass panes ensure good ventilation of the gap. The perforation of the sand-lime bricks also creates interesting optical effects in the interior.
For the developed concepts Transsolar has proven their function by means of thermal building simulation with TRNSYS and flow simulations with TRNFLOW.