Viability of 'Buoyancy Generation' during commercial electro H2 production

[Mike M]

I realized too late, that this may have been a far better forum to post this in, than the one I did. Rather than cross-post, I'll just attach a link to my other post on this forum concerning this topic:

http://www.overunity.com/index.php?topic=11282.0

Thank you for your indulgence.

[brian334]

You are right this idea has been posted here before.

Its not a bad idea.

[Mike M]

Hmm, Are you certain?
Perhaps that was calculated based on the assumption that both gases H & O are combined in one stream, in which case that would probably be correct as the total molar weight would remain the same as water.

However I was assuming we are keeping the H and O separate as in a DC electrolysis (since the idea is to recover pure H to begin with).

Thus based on my (quick) calculation :
1 mole Hydrogen = 1 gm (22.4L at STP) density ~4.4e-5 g/ml

Avg ocean temp 1 mile down 2 deg C
Pressure 1 mile down ~2280 psi (155 atm)

V=(nRT)/P
1 mole @ 2280psi and 2C = 145 ml (cc)
density H @ 1 mile deep = 1gr/145cc = .007g/ml (assuming I got all the decimal places correct - someone double-check my math) vs. ~ 1.03gr/ml for salt water. (seawater actually gets slightly denser at 1 mile depths too)
Thus it should rise readily (and decrease in density - increase in volume as it goes)
I haven't done the math, but even the Oxygen component should be light enough sufficient to rise.
Whether 1 mile is sufficient for break even = ?
Even if it generates enough to merely reduce the cost of H production there may be an advantage.

[brian334]

Good job Mike,
Sorry for my daum response.
Brian334

[brian334]

What is the maximum pressure electrolysis of water can occur?
Does it take more electricity at high pressure?