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Probe fields by Geo-En – Performing over decades

A probe field is an underground heat exchanger and used the energy stored in the soil. In winter, it delivers geothermal heat and slows the highly efficient operation of heat pumps and in summer, it offers geothermal cooling to cool buildings. As the probe fields do obstruct the groundwater, they are usually acceptable at almost all locations.

A probe field comprises a large number of borehole heat exchangers which are mostly inserted and cemented into in hundred-meter deep boreholes. A single borehole heat exchanger is made of four polyethylene plastic pipes, out of which two are connected by a U-form toe point at the lower end (double-U probes). A liquid (water or brine) circulates in pipes which in winter, obtains heart from the ground using the wall of the U-pipes and in summer, emit heat in the ground i.e. receives cold energy. As the performance of the individual probe is further reduced than in case of a groundwater circulation system, a field of probes is required to supply energy to large buildings.

We ensure that maximum performances and energy quantities are obtained from the probe field and the system continues to remain stable over decades. For this purpose, we implement geological investigations and tests, simulate the long-term behaviour of probe fields and precisely analyse the interdependencies of individual probes. We monitor the borehole as well as the construction of the system and equip the system with a monitoring and control system. Thus, we ensure the optimal operation of the energy system and make sure that the investment is worthwhile. For this purpose, our experience in building several probe fields which provide climate-friendly energy to various types of objects, from multi-family houses on rows of houses up to an urban area, have proved to be beneficial.

A probe filed is made of a large number of borehole heat exchangers which function as underground heat exchangers. In winter the probe field delivers geothermal heat and allows the highly efficient operation of heat pumps. In summer it offers geothermal cooling to cool buildings.


Borehole heat exchangers can also be upgraded in the inventory
and provides renewable heat and cold energies as a field to even larger objects.

Simulation of temperature development in the ground for the
Berlin-Zehlendorf project with ninety, circular organized borehole heat exchangers.

Image on the left: Temperature spread at the end of the 29th cooling period

Image on the right: Temperature spread at the end of the 30th heating period