Re: Solar-hydrogen home power system?

From: Don Lancaster (don_at_tinaja.com)
Date: 10/18/04 

Date: Sun, 17 Oct 2004 19:51:55 -0700

Gunnar wrote:
>
> "Don Lancaster" <don@tinaja.com> wrote in message
> news:41731A97.1595A9EC@tinaja.com...
> > > Don, I'm confused here. Surely a method of storing excess power
> > > generation makes more sense than letting the daylight go to waste.
> >
> > Not when most of the value of the excess power is instantly destroyed,
> > as irrevocably happens during electrolysis.
> >
>
> Hi Don,
>
> I have never seen any calculations on energy usage for hydrogen production.
>
> When you say most of the energy is destroyed, I may assume that for every
> energy unit used to produce hydrogen, less than half is recoverable? Is the
> lost energy simply converted to heat during the electrolysis?
>
> Gunnar.

Exergy is a measure of the thermodynamically reversibly recoverable
energy fraction.
An unstruck match has very high exergy, a slightly warmer has very
little.

Electricial energy has very high exergy. Unstored hydrogen gas energy
has very low exergy.

If you go electricity ---> hydrogen ---> electricity you get less than
none of it back, because of inefficiencies and fully burdened
amortizations.

See http://www.tinaja.com/glib/energfun.pdf for a tutorial. 

-- 
Many thanks,
Don Lancaster
Synergetics   3860 West First Street  Box 809  Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com   
Please visit my GURU's LAIR web site at http://www.tinaja.com

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