Spinglo Sponglo! wrote:
I was reading in New Scientist about some Japanese dude who was trying to invent a sub like that in "hunt for red october" but the sub was crap. However, he thought that he could take the underlying engine and turn it into a dynamo, and create electricity from water motion (tides). To do that, you would have to have the turbines off shore, and get the electricity back to land would be uneconomical. He then came up with the idea that you could use that electricity to turn the sea water into Hydrogen and Oxygen, and then pump that to shore, and use those gases to fuel hydrogen engines.
NS preview hereI think it's a really good idea, and makes good sense.
I couldn't read most of the article because it requires registration, but frankly, it sounds like bollocks.
First, as someone else pointed out, there's not really any major difficulties with transporting power ashore in the first place. If you had a particularly vast source of electrical energy which was an incredibly long way from land, you might want to go for ultra-high-voltage monopolar DC transmission instead of bog standard 3 phase, but it's not really an issue. Mainly because there's no need to put the thing so far away.
Suggesting hydrogen to transfer the power sounds more like an ill-informed attempt to jump on the hydrogen hype-wagon (as well as the 'superconductorz OMG' bandwagon), which leads to the conclusion that the whole thing is probably nonsense.
Hydrogen from salt water? I'm not a chemist but that sounds like a good way to make a chlorine generator and not much else.
Oh, and electrolysis is only about 50% efficient anyway so that's not looking too clever. And then you've got to convert the gas back into energy on the shore, which you can't really do without wasting most of it again.
Bad idea all round.