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How much electricity is required to make 1 gallon of liquid hydrogen ?

How much electricity is required to make 1 gallon of liquid hydrogen ? - Chemistry Forum

How much electricity is required to make 1 gallon of liquid hydrogen ? - Chemistry Forum. Discuss chemical reactions, chemistry.


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  #11  
Old 01-22-2004, 10:13 AM
Gavin Whittaker
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Default How much electricity is required to make 1 gallon of liquid hydrogen ?

steve mew <[Only registered users see links. ]> writted:
: I am doing some feasability studies for a potential hydrogen generation
: plant and one of the questions is how big should the wind turbine be.
: Specifically :

: Q1: How much electricity is required to make 1 gallon of liquid hydrogen
: ?

It doesn't matter whether you do it with electricity or not, the
energy required is the same (although, of course the actual energy
required is much more due to the second law of thermodynamics). Let's
assume you want to generate it from water by electrolysis, then the energy
for the reaction H2O -> H2 + 0.5(O2) is 237kJ mol-1 (=118kJ per grams of
H2). Now you need to convert to kJ per gallon (WHY gallons?!??) using the
information below, and then convert to watts according on the rate of
production desired.

: Q2: When liquifying Hydrogen, how much liquid in ml does 1 cubic meter of
: Gas become when cooled from standard conditions ?

Density of H2(gas) is 9x10-2 g.l-1 at STP
Density of H2(liquid) is 118 g.l-1 at BP of hydrogen.

The rest of the calculation is obvious.

HTH, Gavin
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  #12  
Old 01-22-2004, 08:02 PM
dave e
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Default How much electricity is required to make 1 gallon of liquid hydrogen ?

Repeating Rifle <[Only registered users see links. ]> wrote in message news:<[Only registered users see links. ]>...

Steve,
These are easy problems. I'll do your homework for you for far
less than a registered chemical engineer. Contact me privately, and
send your credit card number in advance.

Dave
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  #13  
Old 01-22-2004, 11:04 PM
Steve Turner
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Default How much electricity is required to make 1 gallon ofliquidhydrogen ?

"steve mew" <[Only registered users see links. ]> wrote:


Ph.D., huh? Somehow I doubt it. In my part of the world, Ph.D.s have
a little more creativity and maturity than indicated by the paragraph
above.

Steve Turner

Real address contains worldnet instead of spamnet
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  #14  
Old 01-22-2004, 11:28 PM
Mike Painter
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Default How much electricity is required to make 1 gallon of liquid hydrogen ?


"dave e" <[Only registered users see links. ]> wrote in message
news:10ffa4e4.0401221202.37f26eb0@posting.google.c om...
news:<[Only registered users see links. ]>...
generation
hydrogen
meter of

Heck, I'll do it for free.
Q-1: how big should the wind turbine be?
Huge unless you use a farm, then really big.
Q1: How much electricity is required to make 1 gallon of liquid
hydrogen.
Lots and lots and lots to separate it from water.
Lots and lots to compress it to a liquid.

Q2:When liquefying Hydrogen, how much liquid in ml does 1 cubic meter of
Gas become when cooled from standard conditions ?
Less than 10 but you have to leave room in the tank for expansion so the
less than 10 also includes expansion space. (Quite a bit in fact)

If this is not a homework problem you might want to consider buying stock in
my hydrogen wells or investing in the even more exciting idea of hydrogen
mines. I and the other people are sure that solid hydrogen would be
mineable.




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  #15  
Old 01-23-2004, 01:52 AM
Josh Halpern
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Default How much electricity is required to make 1 gallon of liquid hydrogen?



Mike Painter wrote:


Except for rockets and bubble chambers only an idiot would liquify
hydrogen for storage, especially for energy applications, and in the
later case, maybe they are also idiots.

josh halpern

josh halpern

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  #16  
Old 01-23-2004, 03:37 PM
Joe 123
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Default How much electricity is required to make 1 gallon of liquid hydrogen ?

look up the density of liquid H2. That will tell you the weight of H2 in
g/ml. Then 1mole of gas at STD will occupy 22.4 litres. Pretty simple ay.

No charge, your welcome
but if you want send a donation to my paypal address

Joe



"steve mew" <mewsteve@hotmail.com> wrote in message
news:MfjPb.4263$h77.2161@nwrddc02.gnilink.net...
hydrogen
of


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  #17  
Old 01-23-2004, 06:19 PM
Repeating Rifle
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Default How much electricity is required to make 1 gallon of liquidhydrogen ?

in article 0dbQb.44333$[Only registered users see links. ].com, Joe 123 at
[Only registered users see links. ] wrote on 1/23/04 7:37 AM:


That would be too much effort@

Bill

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