Heat Storage
We can harvest the energy from the sun, wind and proces heat and use it for many purposes - including district heating. Because we have the highest solar irradiance in the summer and the largest need for heat in the winter we need storage.
So how do we achieve seasonal storage?
How do we use borehole thermal energy storage in a new and engineering way?
Learn more on the following pages.
How does it work?
Heatstorage established by directional drilling
When the specific heatstorage is designed the drilling paths are calculated and programed into the machine.
The drilling is following the programed path and is drilled until penetrating the surface.
Then the hose is mounted to the drilling rods and pulled slowly back towards the drilling machine.
The graut is simultaneously pumped through the drilling rods and filling out the gap between the hose and the soil to assure a good thermal contact between the hose and the ground sediment.
Prerequisites for heatstorage using directional drilling
The requirements for a successful heat storage facelity is depending on the geological conditions.
The critical point is hydrogeology: If the heat storage is placed in an area with large amounts of water migrates through the heat store then migrating water will transport the heat away from the storage and the project will be unprofitable.
Knowledge about the geology and hydrogeology is escential to accomplish a successful project. It is crucial to conduct a geological survey preliminary to the drilling.
Requirements in preliminary geological survey:
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A perimeter of a suitable size in connecting with the district heating string
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Depth to ground rock, (directional drilling is more expensive in ground rock)
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Identifying migrating ground water
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The composition of the layer depth of different soil types for dimensioning purposes (link to soil properties)
Geothermal heat storage
Geothermal heat storage utilizes the ground's natural heat capacity, build by using directional drilling is by far the cheapest way to seasonally store heat. Storage is more relevant than ever. It is likely that massive investment in solar, wind and production heat is causing a great need for heat storage.
Heatstorage.dk has developed a unique concept for heat storage. The ground's natural heat capacity is used to store the heat.
The heat storage is established by directional drilling, resulting in less surface damage during construction. It is possible to establish a heat storage under already used perimeters. The surface area can be used freely and the heat storage can even be established underneath buildings or paved areas.
The most significant advantage of the concept is the initial expenditure which amounts to merely 20% of the second cheapest heat storage system currently on the market.
Geothermal heat storage established by directional drilling is the cheapest construction method for seasonal heat storage. Initial expenditure for geothermal storage is from EUR 0.1/ kWh.
Why using dirictional drilling?
Directional drilling is a low impact drilling method suitable for building geothermal heat storage in sediments down to 40 m depth.