Comment on Grid-Scale Bubble Batteries Will Soon Be Everywhere

SpaceNoodle@lemmy.world ⁨2⁩ ⁨months⁩ ago

• it_depends_man@lemmy.world ⁨2⁩ ⁨months⁩ ago

  Could be very high, even the waste heat from the compression could be used to achieve more compression and turbines get to above 90%, that all depends on the scales they’re building this at. 70% overall doesn’t seem unrealistic as an educated guess.

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  • oxbech@feddit.dk ⁨2⁩ ⁨months⁩ ago

    On their website (energydome.com) they claim “75%+” round trip efficiency, so not a bad guess!

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    • sunbeam60@feddit.uk ⁨2⁩ ⁨months⁩ ago

      That’s a hell of a lot better than most other systems. If true, and if scalable, this is a huge innovation.

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      • fullsquare@awful.systems ⁨2⁩ ⁨months⁩ ago

        compressors, turbines (like steam turbines), piping, container for liquid carbon dioxide, lots of plastic for the bubble, something for thermal storage, dry and clean carbon dioxide, these aren’t unusual or restricted resources, don’t depend on critical raw materials or anything like that

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    • fullsquare@awful.systems ⁨2⁩ ⁨months⁩ ago

      Compressed air without heat recovery is more like 30%, so this is huge

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    • brucethemoose@lemmy.world ⁨1⁩ ⁨month⁩ ago

      I was just about to bang out that they must lose a lot of heat from the compression. But apparently not! That’s amazing.

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  • HaraldvonBlauzahn@feddit.org ⁨1⁩ ⁨month⁩ ago

    even the waste heat from the compression could be used to achieve more compression

    No. Waste heat can by definition not be converted to mechanical work.

    Otherwise, one could build a perpetuum mobile: Convert heat to mechanical work, use that work to generate heat, convert it to work again, and so on. You’d have a machine that generates energy out of nothing, and that’s not possible because of the law of energy conservation.

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    • nooneescapesthelaw@mander.xyz ⁨1⁩ ⁨month⁩ ago

      en.wikipedia.org/wiki/Recuperator

      A recuperator is a counter-flow energy recovery heat exchanger that recovers waste heat in the supply

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• BlackLaZoR@fedia.io ⁨1⁩ ⁨month⁩ ago

  Sure wish they mentioned the effeciency.

  Without it you should dismiss the whole article as worthless garbage

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• kalkulat@lemmy.world ⁨1⁩ ⁨month⁩ ago

  Damned good question, and I played stump-the-search-engine for 15 minutes and it’s like they’re AVOIDING that question

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