Comment on World’s largest compressed air energy storage project comes online in China

kaboom36@ani.social ⁨6⁩ ⁨months⁩ ago

• hitmyspot@aussie.zone ⁨6⁩ ⁨months⁩ ago

  The tldr says 72% efficient. If it can store excess solar or wind from times they are not in use and release at times of higher demand, it should be great.

  Better is always on the road to perfect.

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  • kaboom36@ani.social ⁨6⁩ ⁨months⁩ ago

    Yeah that isn’t as horrible as I had initially thought, though its still not great

    You are right though something is better than nothing, but I wonder how this facilities cost compares to an equivalent battery storage facility

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    • wewbull@feddit.uk ⁨6⁩ ⁨months⁩ ago

      In all of this, we need diversity. Diversity of generation sources (solar, wind, tidal, etc). Diversity of storage (Chemical batteries, compressed air batteries, pumped hydro, etc). Each will have different sweet spots; cost vs reaction time vs capacity vs efficiency.

      Try not to dismiss a technology just because it’s not the whole solution. Nothing ever is. They all contribute a part to the big picture.

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• Diplomjodler3@lemmy.world ⁨6⁩ ⁨months⁩ ago

  Compared to what?

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  • captain_aggravated@sh.itjust.works ⁨6⁩ ⁨months⁩ ago

    pumped water or flywheels maybe? you lose a lot of energy compressing gas to heat dissipation.

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    • Diplomjodler3@lemmy.world ⁨6⁩ ⁨months⁩ ago

      Well, no. The round trip efficiency of pumped hydro is terrible. And flywheels aren’t scalable. 72% is pretty decent and I’m sure that can still be improved.

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      • Skua@kbin.social ⁨6⁩ ⁨months⁩ ago

        Round trip efficiency of modern pumped storage hydro is about 80%. How is that horrible if 72% is decent?

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    • threelonmusketeers@sh.itjust.works ⁨6⁩ ⁨months⁩ ago

      If you have a good heat exchanger, don’t you get most of that energy back when expanding the gas?

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      • captain_aggravated@sh.itjust.works ⁨6⁩ ⁨months⁩ ago

        What does “a good heat exchanger” look like in this case? You compress air, the pump heats up, so you ventilate it to keep it cool. The air in the tank is hot, and starts to cool as it sits in the tank, and this causes a decrease in pressure, which is why even with no leaks a shop air compressor will run for awhile, stop, then after awhile cut back on again.

        I get that I’m applying a shop tech’s “machines that I can move with a hand truck” understanding to factory-size operations here but…

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  • kaboom36@ani.social ⁨6⁩ ⁨months⁩ ago

    I was thinking of lithium or sodium ion battery storage

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    • wewbull@feddit.uk ⁨6⁩ ⁨months⁩ ago

      It would take 460 Tesla Megapack 2 XLs to be the same capacity as this. The biggest deployment so far of those is about 200 Megapacks 1 giving 450MWh capacity vs 1,800MWh for this.

      The lithium batteries can supply the same power (300MW) and cost $160M. This cost $207M, so quite a lot cheaper given 4x the capacity.

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