Dividend Industries AB

SUSTAINABLE ENERGY TECHNOLOGY DEVELOPMENT

"Geothermal energy is the only green energy source that is not intermittent and can be found anywhere on our planet"

Geothermal Energy

There are two types of Geothermal energy definitions, Shallow and deep geothermal.

Shallow geothermal energy is mainly solar energy passively being stored in the ground, rock and ground water system. The solar energy reaches due to direct radiation, rainfall and wind a few hundred meters into the ground. At a depth of about 10 – 15m seasonal variations can be seen in the ground temperature, but at greater depth the temperature is even over the seasons and is approximately the same as the annual average temperature of the air. At greater depths the Earth's interior holds a practically unlimited supply of energy in form of heat. This heat originate from the creation of the planet and is continuously resupplied by radioactive decay of thorium, potassium, uranium and other radioactive isotopes which is to be found in Earth's core. Temperature within the Earth increases with depth. The inner core is believed to have temperature of 7000 °C. The rate of which temperature is increased with respect to increasing depth is called the geothermal gradient. The global average is around 25 to 30 °C/km but varies between geological regions and can be several times higher in high-grade geothermal regions. The temperature difference between the core and the surface causes a constant outward heat flow. This heat flow ensures that if heat is extracted locally in a volume of rock it will be replenished over time and regain its initial temperature. The constant heat production by radioactive decay also fasten this process. These regeneration processes, and the fact that the supply is almost unlimited, makes it possible to consider geothermal energy as a sustainable energy source.

Shallow geothermal

Shallow geothermal uses heat pumps to provide both heat and cold by extracting energy from a source and transferring it into a building. Heat can be extracted from any source such as a borehole, ground layer, ground water or a lake for example. Geothermal heat pump, Ground source heat pumps Groundwater heat pump

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Deep geothermal

Deep geothermal energy is defined a little different depending on the local geological conditions. But our definition of deep geothermal energy is such depth where heat pumps are obsolete and the heat extracted is sufficient

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Thermal energy storage

(TES) Thermal energy storage (STES) Seasonal thermal energy storage (BTES) Borehole thermal energy storage (ATES) Aquifer thermal energy storage (CTES) Cavern thermal energy storage (HPTES) High power thermal energy storage

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OUR RESEARCH

Since 2010 we at Dividend Industries have been focusing on renewable energy research

High power seasonal storage

Dividend Industries are developing a new efficient and more cost effective seasonal heat storage solution compared to classical borehole storages. The new system has 10 times less boreholes and four times larger heat transferring surface against the rock to enable much larger heat flows.

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Deep shaft research to 7km+

Deep geothermal energy is defined a little different depending on the local geological conditions. But our definition of deep geothermal energy is such depth where heat pumps are obsolete and the heat extracted is sufficient

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High temperature energy storage in vacuum insulated concrete containers

(TES) Thermal energy storage (STES) Seasonal thermal energy storage (BTES) Borehole thermal energy storage (ATES) Aquifer thermal energy storage (CTES) Cavern thermal energy storage (HPTES) High power thermal energy storage

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OUR TEAM & COLLABORATORS

ABOUT

Dividend Industries

Dividend Industries AB is a R&D company active in the area of sustainable energy technology and implementation of geothermal systems to district heating grids. The company is based in Stockholm, Sweden, with research facilities both in Stockholm and in Uppsala. Our objective is to pursue innovations that can meet the future energy demand and minimizing the negative effects on the environment. Our research is based on geo energy which includes thermal storage and thermal power production from both shallow and deep wells. We research in high power thermal energy storage for both on and off grid applications. We are also developing new methods to create dry vertical shafts to reach depth over 5km for many applications such as geothermal, mining, construction etc.

Contact

  •   +46 762 089845
  •  Västra Granholmen 4 185 99 Vaxholm

2015 Summary of geo energy installations in Sweden

Geothermal heat pumps
Lake and ground heat pumps
Ground water heat pumps
Deep geothermal power plants
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