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Re: can you create electricity from pure hydrogen? what about heat? [Re: trendal]
    #9063052 -

Imagine how much energy it would take to dissociate 5000 gallons, I bet it would be alot!

edit - Ha, 1E12 Joules, more than a US citizen uses in a year.

Edited by Qubit (10/11/08 01:18 PM)

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Re: can you create electricity from pure hydrogen? what about heat? [Re: sleepy]
    #9064109 -

sleepy said:
ok now, hear me out, but what if you made like a 5000 gallon tank of water and hooked the electrodes of the electrolysis machine to a lightning rod, and use the lightning to turn it all into hydrogen?  would that work?


Too sporadic and too powerful in each burst. A better method would be to use photosynthesis to produce hydrogen, and let the sun do the work.


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I know... that just the smallest
                                                part of the world belongs to me
You know... I'm not a blind man
                                                    but truth is the hardest thing to see

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Re: can you create electricity from pure hydrogen? what about heat? [Re: zouden]
    #9064307 -

I think photosynthesis is less efficient than modern photovoltaics. 

http://en.wikipedia.org/wiki/Photosynthetic_efficiency

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Re: can you create electricity from pure hydrogen? what about heat? [Re: DieCommie]
    #9064322 -

Yes, but much cheaper.

That said, I used to work on photosynthetic hydrogen production, but I kinda feel it's a dead-end now. In fact I think hydrogen fuel in general is a bit unrealistic, compared to (say) biodiesel.


--------------------
I know... that just the smallest
                                                part of the world belongs to me
You know... I'm not a blind man
                                                    but truth is the hardest thing to see

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Re: can you create electricity from pure hydrogen? what about heat? [Re: zouden]
    #9065986 -

Yep, hydrogen on a mass scale is very unrealistic.  Even biodiesel is only worthwhile if the right feedstock is used (algae/cyanobacteria).


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Re: can you create electricity from pure hydrogen? what about heat? [Re: DieCommie]
    #9067465 -

Quote:
The photosynthetic efficiency is the fraction of light energy converted into other forms of energy for use. 


OK, but how are they defining the total light energy here?  The amount that hits the surface of the leaf, the amount absorbed by the leaf, or the amount inducted into the photosynthetic pathway...?  I'm pretty sure the pathway itself is damn near 100% efficient.  It's only because leaves aren't very efficient at channeling solar energy into the pathway that the efficiency is so low.  Solar cells on the other hand are very good at absorbing light and putting it in their "pathway", but the conversion process is full of holes for this energy to leak out of the system through.  Maybe we'll see a hybrid system someday which combines the strengths of each.

Anyway, just a tangent...

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Re: can you create electricity from pure hydrogen? what about heat? [Re: ChuangTzu]
    #9067721 -

Of the total flux coming in, the plant converts around 5% of that into usable work, the panel converts between 10-15% into usable work.

Of course the catch is what zouden says... plants are cheaper and are being grown anyway.

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