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Politics : PRESIDENT GEORGE W. BUSH -- Ignore unavailable to you. Want to Upgrade?


To: DuckTapeSunroof who wrote (305608)10/8/2002 9:50:50 AM
From: J.B.C.  Read Replies (2) | Respond to of 769667
 
No I'm all for it. Bring it on. Fuel Cells would be great if it was viable to split water molecules and turn them back to water. I warn you though that the round trip process is energy inefficient. The process to produce the hydrogen from water is not likely to yield a cost benefit over fossil fuels for a long time. One statement that you posted said they were at an 8.5% efficiency for doing this, that means 91.5% of the energy is lost usually in the form of heat. Once converted a fuel cell will yield less than 40% efficiency and could be as low as 24%. A car engine yields about 20% efficiency

How long do we wait? What do we do in the meantime?

Jim



To: DuckTapeSunroof who wrote (305608)10/8/2002 10:35:58 AM
From: DavesM  Read Replies (1) | Respond to of 769667
 
Buddy,

I hope you are right. But, it will probably always be easier (and cheaper) to break the C-H bond than the O-H bond. Meaning, getting Hydrogen from fossil fuels might still be cheaper than getting hydrogen from water. This means that the cheapest Hydrogen might well come from middle eastern oil (or gas).

Its been a while since I looked at the subject, but I think natural gas is the cheapest source for Hydrogen.