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A Finnish town is heating itself with 2,000 tonnes of crushed rock: its giant “sand battery” can cover almost a month of heating demand and has cut district heating emissions by 70% (www.cnbc.com)
submitted 2 months ago by to c/technology@beehaw.org
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[–] 2 points 2 months ago

0c water kept cool by a big ice tank. Traditional radiators wouldn't work but there are options that do. High thermal mass of water too.

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