Decisive advantage: Quality and durability
In the planning stage, a market analysis was conducted of the available and suitable geothermal probe types. Conventional, as well as more pressure-resistant designs were considered. Both the cost-benefit ratio and the quality of the product were evaluated and compared. The owner of the geothermal system, respectively the contractor Primeo Energie, finally chose the JANSEN hipress geothermal probe.
The decisive advantage was the highest available pressure resistance of JANSEN hipress of PN35. This key figure indicates that the probe product supplied can withstand an internal pressure of 35 bar over at least 50 years of operation at an operating temperature of 20°C. Furthermore, the JANSEN hipress has an outer protective layer that is much thicker than specified by the standard and thus also offers greater safety during installation. These quality advantages maximize the reliability, so that all the probes in the huge field will continue to work in the worst-case scenario if, due to geologically difficult situations, the stabilizing function of the borehole backfill decreases over time. Although this is not normally expected, the increased pressure rating nevertheless improves longevity, so it can be expected that the borehole geothermal probes will continue to serve efficiently well beyond the planned 50-year minimum service life. Especially for a building complex of this type, this more than pays for itself.