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I'm fascinated with seasonal heat storage using large underground water tanks. Apparently one drains the heat in winter, and dumps heat during the summer?
by avhception 1y ago
I'm fascinated with seasonal heat storage using large underground water tanks. Apparently one drains the heat in winter, and dumps heat during the summer?
- blahlabs 1y agoSand batteries are a similar concept, with the advantage of being able to store at over 100°C. I believe they can store heat for months. https://polarnightenergy.com/news/worlds-largest-sand-battery-now-in-operation/ https://polarnightenergy.com/news/worlds-largest-sand-batter...
- defrost 1y agoAs @blahlabs notes in peer comment sand batteries / heating buried dirt works better than heating water for seasonal power storage and smoothing. In simple terms there's better efficiency and ease of use from having a higher delta (temperature difference) and dirt / sand / salts heated to 600C are significantly hotter than water at 100C. Once water turns to steam drama and expenses climb.
- avhception 1y agoMakes perfect sense. Now I wonder why these big water batteries were built in the first place.