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Geothermal probe

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 Geothermal probe

High-reliability geothermal probes from FRANK are used to efficiently extract the low-potential soil heat required to operate geothermal heat pumps. Frank geothermal probes meet the highest quality requirements, guaranteeing reliable and efficient operation for many decades.

FRANK geothermal probes made of PE 100-RC are extremely strong and resistant to point loads and crack propagation. To achieve such a consistently high quality standard, Frank manufactures its probes on automated welding machines specifically designed for this purpose. All production processes comply with the relevant standards as well as the SKZ HR3.26 Technical Code and are controlled by the Darmstadt State Institute for Materials Testing.

Geothermal energy is thermal energy stored in the soil, which is constantly charged as an accumulator, due to the internal energy of the earth and regenerated closer to the surface due to solar radiation and rainwater. In our latitudes, the soil is below a depth of 10 m, has a constant temperature of 8 to 12 ° C throughout the year. This temperature level is suitable for energy-efficient heating of houses with heat pumps, as well as for passive (natural) cooling of houses. Modern heat pumps use geothermal energy to convert one kilowatt-hour of electricity into up to four or more kilowatt-hours of electricity into up to four or more kilowatt-hours of heat. A geothermal heat pump can save a significant amount of fossil fuel and significantly reduce CO₂ emissions.

Геотермальний зонд Frank


A significant advantage of using geothermal probes is the possibility of implementing a system of passive (natural) cooling. The heat carrier from the heat source - soil probes, with low temperature (8-12 ° С), is fed directly into the cooling system, which allows to save up to 95% of energy, in comparison with traditional air conditioning systems. The use of a passive cooling system makes it possible to increase the motor resource of the heat pump, as the compressor mode is not used in the cooling mode. Also, thanks to the mode of natural cooling, the soil is regenerated by heat, which we remove from the premises. Thus, at the beginning of the heating season, we get a soil that has accumulated a significant amount of heat energy, which is then efficiently used by the heat pump.

Геотермальний зонд Frank

Features of Frank geothermal probes

  • Have a U-shaped design
  • Two- or four-pipe performance
  • U-like compound is a high-pressure cast polymer product. Welding processes are automated: the probe tubes are welded to the connector using welding robots
  • Each geothermal probe must be tested in production. An individual quality certificate and a passport with a serial number are provided for each product
  • Production quality control meets all necessary German geothermal standards
  • systems, namely the requirements of the directives SKZ HR 3.26, VDI 4640, DIN 8074/75
  • FRANK GmgH geothermal probes are made of mechanical damage-resistant polyethylene PE 100-RC according to PAS 1075. Operating pressure up to 16 bar
  • Service life of 100 years. Special probes made of cross-linked polyethylene Pex-a are also available
  • Геотермальний зонд Frank

    An important component of the proper functioning of geothermal probes is a clear selection of their number and length, as well as professional drilling and drilling wells. Based on the data of the soil profile and hydrogeological conditions, it is possible to obtain the corresponding values ​​of specific thermal power (watts per meter of probe length), taking into account the number of operating hours during the year. Based on these data and taking into account the heat capacity of the heat pump determined by the project, the required length of the probes and their number are determined. Energy capacity 1 m.p. vertical ground probe: 35-70 W. The maximum depth of wells and the number of probes, in addition to the properties of the rock, significantly depend on the groundwater level. Crossing of aquifers is desirable to avoid, as the materials and production methods currently used in standard geothermal solutions do not always provide a reliable seal.Therefore, even with careful tamping of wells with waterproof suspensions, there is no guarantee of achieving the required tightness. To avoid the negative effects of geothermal probes on each other, it is recommended to maintain a minimum distance between the probes of at least 6 m. up to 8-10 meters).