Publication Abstract

Proceedings - Seventh International Conference & Exhibition on Piling and Deep Foundations, 1998, Vienna, Austria, (DFI)

The use of heat exchanger piles as exemplified in the MAIN TOWER building in Frankfurt am Main
Dr. Ing. Nico von der Hude, Dr. sc. Nat. Christoph Kapp

In geothermics the earth’s crust is used as a source of heat and as a heat sink. One possible way to exploit a construction site as a source of energy is to use heat exchanger piles. Here were present an example with the world’s biggest project in this field to date. On e of the highest and most modern office buildings in Europe is currently under construction in the banking quarter of downtown Frankfurt am Main. The new building, known as the MAIN TOWER, will have a special feature; it will implement an innovative energy concept, using the energy potential in the ground. This high-rise building is set on a foundation of drilled piles. These serve to take the load of the building, and, like the overlapping piles of the bored diaphragm wall to secure the construction pit, they are an integral part of the overall energy concept. The piles were fitted with heat-exchanger pipes to utilize the energy potential in the ground beneath the building to a depth of fifty meters below site level to generate heat in an environmentally acceptable manner. This results in a number of interfaces between the foundations and the technical equipment in the building. As a consequence, the client was able to make an appreciable reduction in the number of district heating plants required to heat the building.

 article #363; publication #34 (IC-1998)