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This is really cool.
In the town of Pornainen, they've built a 13 meter tall battery of "low-grade" sand that they warm-up to 450 degrees C - that 842 degrees F! - and it can hold that temperatures for weeks if not months, then they can use the hot air from it to heat the town's local heating network!
I think that's a pretty awesome use. They're using excess energy generated by renewable sources - free energy - to heat up the sand, then piping it around town. The former method to warm up the town was a woodchip furnace plant, clearly they're drastically cutting their CO2 footprint with this. And by using low-grade sand, their costs are pretty low.
But let's talk about sand for a minute. Businesses are literally dredging up ocean floors for sand to make more concrete. And you can't recover it from broken-up concrete when buildings are demolished. Now, to use sand to make a thermal battery I think is a worthwhile endeavor. I just wish they'd work out better ways to repurpose and recycle existing demolished concrete.
https://www.the-independent.com/tech/sand-battery-renewable-energy-finland-b2818348.html
https://hardware.slashdot.org/story/25/09/06/027211/a-very-finnish-thing-huge-sand-battery-starts-storing-wind-energy-in-soapstone
In the town of Pornainen, they've built a 13 meter tall battery of "low-grade" sand that they warm-up to 450 degrees C - that 842 degrees F! - and it can hold that temperatures for weeks if not months, then they can use the hot air from it to heat the town's local heating network!
I think that's a pretty awesome use. They're using excess energy generated by renewable sources - free energy - to heat up the sand, then piping it around town. The former method to warm up the town was a woodchip furnace plant, clearly they're drastically cutting their CO2 footprint with this. And by using low-grade sand, their costs are pretty low.
But let's talk about sand for a minute. Businesses are literally dredging up ocean floors for sand to make more concrete. And you can't recover it from broken-up concrete when buildings are demolished. Now, to use sand to make a thermal battery I think is a worthwhile endeavor. I just wish they'd work out better ways to repurpose and recycle existing demolished concrete.
https://www.the-independent.com/tech/sand-battery-renewable-energy-finland-b2818348.html
https://hardware.slashdot.org/story/25/09/06/027211/a-very-finnish-thing-huge-sand-battery-starts-storing-wind-energy-in-soapstone
