City Hall, Kolbermoor, Germany

City Hall

The target values for the integrated design process were 75 kWh/m² per year primary energy demand and thermal comfort defined according to category II in DIN EN15251. These requirements were used to guide the planning process, and iteratively checked against the dynamic building simulations.
The building envelope is insulated with high quality material, triple glazing with external sun protection and, in addition to the operable windows, a controlled mechanical ventilation system have been integrated. The rooms are heated or cooled via an active floor slab. The ceilings of the city hall are active slabs as well. The thermal simulations show that thermal comfort is guaranteed in all determined rooms equipped according to this climate concept.
The minimization of power consumption plays a central role, since this final energy demand has by far the highest primary energy factor. Therefore the town hall will be ventilated by low-power decentralized mechanical ventilation systems with heat recovery and it will be lit with daylight-dependent LED-technology. 85% of the heat demand can be provided by district heating (waste heat). The peak load and supply security is covered by a natural gas boiler with storage tank.
The cold supply for the surface cooling system is groundwater, which is accessed via an extraction well and an injection well. Due to the small capacity of the supply pump the COP>50 is quite high. With this power supply, the primary energy is well below the targeted value.
The new city hall in Kolbermoor showcases high thermal, visual and acoustic comfort at the lowest possible non-renewable primary energy use and is thus a comfortable building with groundbreaking low primary energy demand.

A scientific investigation refers to the building with post occupancy evaluation. Full paper in English > Master Thesis by Lakshmishree Venu Gopal or > En/De bilingual abstact only