Re: Hydrogen economy will never exist

From: Fred B. McGalliard (frederick.b.mcgalliard_at_boeing.com)
Date: 07/13/04 

Date: Tue, 13 Jul 2004 18:24:26 GMT

"Don Lancaster" <don@tinaja.com> wrote in message
news:40F41838.B6E6FA2C@tinaja.com...
...
> Exergy is the thermodynamically reversibly recoverable energy fraction.

This is a bit left handed Don. Thermodynamics, reversability, entropy,
recoverable energy, all usefull issues to understand. What is not at all
easy is dealing with a combustion process and a single part of a dual fuel
as if it were no more than hot water.

> It is the centralmost key to understanding which energy technologies are
> viable and which are not.

So, of course, is entropy. The problem is not that the available energy,
paraphrased as exergy to seperate it from the heat energy which is not
really available, is not central, but that misusing the process is so easy,
it is probably best to stick with entropy.

>
> And clearly shows us why hydrogen from electrolysis flat out ain't gonna
> happen.

And again, the conclusion implies the misuse of the very idea. Gasoline, as
we have already discussed, has so much less exergy than the oil and natural
gas used to produce it, on top of the huge losses in the IC engine, that it
equally "flat out ain't gonna happen". Since this inimitable logic fails so
miserably for gasoline, I would suggest a more careful look at how the
argument works for H2. (Not that I would want to suggest H2 in any
unmodified form as a fuel for anything except rockets and scramjets.)

Relevant Pages

  • Re: Hydrogen economy will never exist
    ... > Exergy is the thermodynamically reversibly recoverable energy fraction. ... So, of course, is entropy. ... miserably for gasoline, I would suggest a more careful look at how the ...
    (sci.energy.hydrogen)
  • Re: Hydrogen economy will never exist
    ... >> Exergy isn't a real word its just made up stuff that could be more ... >> easily and consistently explained using real words like entropy. ... Exergy is no less comprehensible. ...
    (sci.energy.hydrogen)
  • Re: Hydrogen economy will never exist
    ... >> Exergy isn't a real word its just made up stuff that could be more ... >> easily and consistently explained using real words like entropy. ... Exergy is no less comprehensible. ...
    (sci.energy)
  • Re: Solar-hydrogen home power system?
    ... unless loss of exergy and increase in ... Exergy and Entropy determine value; Energy does not. ...
    (sci.energy)
  • Re: Solar-hydrogen home power system?
    ... unless loss of exergy and increase in ... Exergy and Entropy determine value; Energy does not. ...
    (sci.energy.hydrogen)