" The new #sand #battery, designed by Polar Night Energy, is effectively a giant sandpit encased in a roughly 100 by 40 foot (30 by 12 meter) steel container
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" The new #sand #battery, designed by Polar Night Energy, is effectively a giant sandpit encased in a roughly 100 by 40 foot (30 by 12 meter) steel container.
The sand is heated using closed-loop heat transfer pipes and this heat is trapped by two layers of steel sandwiching an insulation layer. The energy is then extracted by blowing cool air through the pipes, capturing the heat to #generate #hot #water, #steam or hot air."
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https://www.livescience.com/technology/engineering/a-scalding-hot-sand-battery-is-now-heating-a-small-finnish-town