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Norway island stores wind power for still days | 30 comments (30 topical, editorial)

Re: Norway island stores wind power for still days (3.00 / 0) (#6)
by Tritium on Tue May 13th, 2008 at 06:34:14 PM MST
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Years ago I saw a system that used a very heavy steel tank (old water heater with the bottom cut out) inverted in a tank of water of slightly larger diameter. The steel tank was open at the bottom and had a gas outlet at the top connected to a delivery tube (out to appliances). The tank started flooded with water and sitting at the bottom of the tank of water. As methane was produced by a digester it would bubble into the bottom flooded tank and rise to the top thus displacing the water and pressurizing the gas to a few psi. If the pressure got too high as the tank filled the tank would simply "float up" and the methane escape into the air. This would work with H2 just fine as long as the tank never floated no H2 would escape.

Thurmond

Re: Norway island stores wind power for still days (3.00 / 0) (#11)
by electrondady1 on Wed May 14th, 2008 at 06:10:08 AM MST
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it has occurred to me that in order to compress the gas,
you simply make the cell capable of produceing the gas under pressure.
so that it is part of the pressure vessel and can be isolated/vented
with some sort of ball or gate valve.
avoiding any sort of exotic pump.

[ Parent ]

Re: Norway island stores wind power for still days (3.00 / 0) (#24)
by joestue on Fri Jun 13th, 2008 at 09:49:34 PM MST
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This is how hydrogen was justified to those wishing to see it used as an economy.

Electrolysis at 3000 psi is currently the idea, it's 85% efficient at reasonable cell loading.

only issue is you need to cascade gas regulators in order to keep the pressure difference across the membrane to a few psi max.

if you try to use a car battery to generate h2 o2, it's about 40%

if you want to, you could use nicd batteries at 1.5 volts across the cell, at about 60% efficiency.

[ Parent ]

Norway island stores wind power for still days | 30 comments (30 topical, 0 editorial)

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