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Grosspeter Tower, Basel

Foundation-stone-laying ceremony for zero-emission high-rise

The foundation-stone laying ceremony on October 30, 2015 marked the official start of construction on the tower. The late timing of the ceremony – after a full year's work on site – was partly due to the sophisticated energy concept. One of the preliminary tasks, for example, was to sink the boreholes for the downhole heat exchangers of the geothermal system, which extend some 250 m below the ground slab.
Further technical highlights of the building include CO2 and propane heat and cooling pumps together with a photovoltaic installation integrated in the facade.

As one of the designers of the pioneering building services concept, Gruner Gruneko AG is handling the heating/refrigeration, ventilation, plumbing and M&C systems along with the technical coordination. The downhole heat exchanger array was developed in collaboration with Gruner Böhringer AG. A dynamic building simulation developed by Gruner Roschi AG was used to model the long-term behavior of the heat exchanger array.

Gruner achieved a European first by successfully coupling the building and downhole heat exchanger simulations while factoring in the system efficiencies. The resulting integral energy simulation has delivered high planning certainty.

At Gruner Gruneko AG, digital construction and the associated building information modeling (BIM) are already an established part of routine design work. The data model developed for the project provides the framework for all information and descriptions. Initial BIM applications have substantially increased the efficiency of the design process with the model, from concept to 3D design.

  • Upper stories  22
  • Building height 78 m
  • Usable area 17, 000 m2

Full details are presented on p. 4-5 of the latest issue (no. 27) of the Gruner Group MAILING

After four years of construction, the 78-meter-high Grosspeter Tower in Basel was officially opened at the end of June 2018. The building facade produces around 275,000 kilowatt hours of electricity per year on an area of 6,000 m2 of photovoltaic modules.