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The "hydrogen economy" has always struck me as a solution lacking a problem.
That's a sharp way to put it. Marchetti himself veered towards methanol in the later days of his career, when it became clear the Nuclear revolution wouldn't happen. He associated hydrogen to his concept of energy islands, that if realized could be producing huge amounts of energy; hydrogen was just a simple way to get this energy to big cities. luis_de_sousa@mastodon.social
The easiest example of this being something like a nail gun that runs off tubing linked to a compressor that's small enough to be carted around by hand. It takes maybe 5-10 minutes to load, and then tops itself off when depleted, which generally takes only a few minutes of continous use.
Where you have existing, natural features that could be used to store large amounts of compressed air you could conceibly use them as a massive version of the compressor that you can cart around by hand. And with smart grid technology, you can use this to push down peak electric loads.
What I'd be most interested to know is if there's a way to apply the same principle to fluids. Greater density would seem to apply the same power storage in a much smaller area. And I'll give my consent to any government that does not deny a man a living wage-Billy Bragg
All existing large scale systems get < 50% round trip efficiency IIRC.
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