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How these “sand batteries” could solve our energy problems

Le silo contenant la « batterie à sable » capable d’emmagasiner de la chaleur pendant des mois. © Polar Night Energy

Finnish engineers have installed the world’s first “sand battery”. It uses sand to store wind and solar energy in the summer as heat, which can then be released in the winter to heat homes and offices.

This winter it is likely to be complicated for many European countries, especially those on which they heavily depend gas Russian. This shortcoming could be partially compensated by increasing the number of facilitiesrenewable energies. However, manufacturing is too variable completely depend on it without even installing large batteriesusually to the General
Symbol: Li Atomic number: 3 Electrons per energy level: 2.1 Atomic mass: 6.941 u Most stable isotopes: 6Li stable with three neutrons (7.5%), 7Li … “data-image =” https: // cdn .futura-sciences.com /buildsv6/images/midioriginal/6/5/a/65a14c964a_70913_lithium.jpg “data-url =” https://news.google.com/sciences/definitions/chemistry-lithium-12336/ “data -more = “Read more”>lithium, expensive to produce. A Finnish company may have found a solution low-tech with a seasonal battery based on artificial sand
Sand can also be obtained artificially, through … “data-image =” https://cdn.futura-sciences.com/buildsv6/images/midioriginal/4/e/9/4e957f8c38_92834_sable.jpg “data- url = “https://news.google.com/planet/definitions/geology-sand-6009/” data-more = “Read more”>sand.

Polar night energy has just completed its first commercial installation in the city of Kankaanpää. Its battery takes the form of a silo filled with sand construction. When there is a surplus of electricity production, the surplus is used to heat the sand up to 500 ° C. This perfectly normal sand can hold this heat. Physicists call heat thermal energy. In the international system it is therefore measured in joules (J). Heat corresponds more precisely to a transfer … “data-image =” https://cdn.futura-sciences.com/buildsv6/images/midioriginal/7/3/5/735709801b_92578_chaleur.jpg “data-url =” https: //news.google.com/sciences/definitions/physics-heat-15898/ “data-more =” Read more “>heat During the months. The battery, about four meters wide and seven high, contains about 100 tons of sand. It has a capacity of 8 MWh (megawatt hour) and a heating power of 100 kW (kilowatt).

A solution without dangerous products

This energy is not converted back into electricity as demand increases because the yield is currently quite poor. On the other hand, the accumulated heat can be retained until winter and transferred to the water heat the houses, offices and even the swimming pool. It is a solution that does not use organic substance, nitrogen substance, etc.
There are several families such as:

organic matter, which constitutes living beings (animals or plants) or … “data-image =” https://cdn.futura-sciences.com/buildsv6/images/midioriginal/e/7/0/e70ccaaf4a_91935_matiere. jpg “data-url =” https://news.google.com/sciences/definitions/matiere-matiere-15841/ “data-more =” Read more “>it matters dangerous, requires very little maintenance and can run for decades.

The next step will be to create a much larger battery. Engineers said the next could be a thousand times bigger. According to the company, the internal temperature of the battery could reach 1,000 ° C, with a capacity of 20 GWh (gigawatt hour) and a power of 100 MW (megawatts). It already offers huge benefits for winter heating, but if engineers can figure out how to efficiently convert heat back to electricity, the sand coil could revolutionize thegreen energy.

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