Would you *like* a more in-depth analysis of your particular case? I can do that, if you're sure you want one!
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Replying to @peroxycarbonate @atroyn
there’s probably no way to do a very good job at this without details that have not been published, so i deleted my tweet the background situation of 4 cleantech funding busts (07-09,11,14,15 china, ‘16) & exponentially dropping li ion cost is probably the single biggest factor
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Replying to @DanielleFong @atroyn
No, compressed air energy storage was never economically viable. Not with underground caverns, but *certainly* not with compressed air tanks. I told you at the time that if you could actually make much cheaper compressed gas tanks then you should sell them as CNG tanks instead.
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And that's what LightSail tried to do, towards the end. But more fundamentally, gas turbines aren't efficient enough for CAES to be worthwhile. Pumped hydro works fine because water turbines are much more efficient, but CAES needs to buy electricity for half its sale price,
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and this has been analyzed, there are papers, but Bill Gates just has Nathan Myhrvold (who doesn't actually know jack shit besides how to be a patent troll) think about things for a couple minutes instead of having somebody actually competent do technical evaluations.
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With the inefficiency of CAES, since natural gas power is being used *anyway* it's clearly more economical to shift natural gas turbine generation times than to store power.
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Baseload gas turbines are more efficient but more expensive than peaking ones, yes...because they need the same heat exchangers and extra turbines you need for CAES! Of course, Malta's plan (using electricity to heat molten salt for power generation) is impractical too.
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Replying to @peroxycarbonate @atroyn
you keep saying turbines, we were not using turbines. water to water heat exchangers, which is what we used, are compact you can make machines at much smaller scale. recip machines are competitive with turbines at many scales and for many applications
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Replying to @DanielleFong @atroyn
Yes, you were using pistons with wet compression. I keep talking about gas turbines because for that application, they're still better. People have tried this stuff already! Wet compression is used in piston compressors for some AC units!
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Replying to @peroxycarbonate @atroyn
why do you think this? it’s completely inapplicable for smaller scales, and like half the eff unless you do all the fancy stuff that aa-lcaes is doing, hear exchangers & stages & multi hundred degree heat storage. wet comp was done in the 1800’s but not optimized, nor expansion
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to actually do this well you need spray design (<25micron droplets), variable valves for the tanks as the fill up and the pressure changes, good choice of materials (stainless, ptfe piston rings)
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