Re: Got on the radio. Coast to coast AM. Subject:Hydrogen

[Peter VanDerWal <peterv@peoplepc.com>]

You wrote that backwards.  Electrolysis can be up to 90% efficient 
though most systems seem to be closer to 70%.  
Of course converting the hydrogen to liquid form looses another 30% or 
so (energy).

FWIW I've read somewhere that liquid hydrogen contains approx 1/4 the 
stored energy of gasoline.  Of course that's not really all that 
meaningful, what counts is how much of the stored energy you can access. 
 Assuming you use FC and an Electric drivetrain...I believe current FC 
are about 50% efficienct, gasoline ICEs are about 20% so by my math that 
means a gallon of gas will take you about twice as far as a gallon of 
hydrogen.

Of course that's not counting the extra size and weight of a container 
that can hold liquid hydrogen, etc.

Jeremy Maus wrote:

>When converting water to hydrogen with electrolysis you lose 90% of the
>electricity you put in.
>
>I think the first statement implies it takes 45KWhrs of energy to _make_ 1
>gallon of liquid hydrogen.  That 1 gallon of hydrogen contains 4.5KWhrs of
>energy.  With 10 gallons you could have the 45KWhrs which should take you
>150 miles.  150 miles sounds right for the range limit of hydrogen fuel cell
>vehicles.
>
>Jeremy Maus
>Belleville, MI
>emidget@comcast.net
>http://www.emidget.info
>
>-----Original Message-----
>From: owner-ev@listproc.sjsu.edu [mailto:owner-ev@listproc.sjsu.edu]On
>Behalf Of Lawrence Rhodes
>Sent: Friday, August 30, 2002 5:17 AM
>To: ev@listproc.sjsu.edu
>Subject: Got on the radio. Coast to coast AM. Subject:Hydrogen
>
>
>Well I found out that it takes 45KW to make one gallon of Hydrogen.  I
>challenged the guest to compare electric to internal combustion hydrogen.  I
>think he is a paid lobby for the car companies.  So it would take 45Kw to
>run an internal combustion hydrogen car 25 to 35 miles.  Wouldn't 45kw take
>the average conversion about 100 miles.  If you were using a fuel cell would
>a gallon of hydrogen make 45kw to run your electric car? Can't seem to find
>anything in the archieves about how far a kw takes you.  Lawrence Rhodes....
>
>
>