Besides the objective of reducing CO2 emissions is the supply of fossil fuels is a major public debate. Given the growth in housing demand Netherlands must also worry about the future energy needs. In recent years, the strong rise of geothermal systems clearly seen. This explosive growth of geothermal systems is of particular soil experts rightly concerned. For geothermal heat extraction, you have to drill into the crust.
Drilling through soil layers by definition leads to disruption of the soil. As secondary effects of drilling through soil layers can be seen disturbing geological values (archaeological, paleontological, geological (hydro) logical and / or soil science) for the environment. The deep groundwater is sweet in the natural situation well protected against influences from above by the shielding effect of thick, hard permeable clay and peat layers. In an undisturbed situation, the substrate also has a certain cleansing effect. This makes the (deep) groundwater supplies may be considered as our invisible underground heritage. This underground heritage in recent years, however, increasingly threatened by increasing human activities, both above and below ground.
The wells provide large amounts of perforation of the crust. The frequent assumption of vertical drilling parties in the Netherlands, and beyond our borders, is that higher returns are achieved by drilling of stature heat exchangers . This reduces the chance of damaging the soil is inevitable.
For many years the brothers Lehmann, of piling Demar Ltd from Lopik, developing an energetic, highly profitable system, and these efforts in December 2008 awarded the Herman Wijffels Innovation at Rabobank. With an eye for an overall sustainable system where the “ People Planet Profit ‘comes first! The final result of the invention is that experts and scientists found that the ground heat exchanger Geothex ® the best performing system in the world. The development is partly based on natural energy transfer while maintaining the underground soil structure, and a critical eye to our future water supplies.
The new geothermal ground heat exchanger tube or the Geothex ® already low returns such lengths from 20 to 50 meters. This is achieved by appropriate dimensioning and the flow to turn into a turbulent effect. Moreover, the resistance of the borehole Geothex much lower than that of traditional drilling techniques and heat exchangers. By using a smaller diameter borehole creates a better heat transmission. Furthermore the Geothex ® for improved thermal efficiency, making the new system to tens of meters shorter and sealing strata not be punctured, so do not need to be restored.
The installation of the geothermal probe Geothex ® is optimally achieved by a new drilling technique developed by Jean Heybroek BV and Geothex BV This is after the bottom of the drill casings, inner tubes placed in the hollow drill. This reduces the risk of external damage to the geothermal probe during insertion virtually nil. Then the drill pipe pulled out while the ground heat exchanger is fixed in the hole behind. The total (minimum) hole during retraction of the drill pipe filled with a sealing material (heat conductive grout) around the geothermal probe. The new legislation which will come into effect 01/01/2011, states that the soil structure to be mapped in during drilling and sealing layers should be restored. With this new technique of Jean Heybroek BV There are exemptions from this complex administrative and practical actions. This results in a fast reliable and accurate drilling technique with the advantage of very low hole isolation. This key factor allows the highest possible efficiency of the heat pump is achieved.
This aforementioned method of drilling and the thermal performance of ground heat exchanger provides a total sustainable system. It is possible even with only water-filled heat exchangers to work without any risk of leakage of antifreeze such as glycol in soil.