Deutsche Flugsicherung, Langen, Germany
Office building for the headquarters of DFS, the German air traffic control; the building fulfilled “low energy office” criteria in force at the time of construction
Project details:
- 154 Borehole Heat Exchangers (vertical loops), each 70 m deep
- 340 kW of heat and cold exchanged with the underground
- The geothermal system provides base-load heat and cold to the building, with classical air-cooled chillers and a connection to district heating for the peaks
- First commercial BHE design in Germany based on ground investigations using TRT
- A monitoring campaign in 2009-2011 proved superb efficiency, with SPF of about 6 in heating mode and 10 in (direct) cooling mode
- >30.000m²
Heat pump for DFS building (left) and first-generation TRT equipment on the construction site in 1999 (right):
