Re: Storing H2 at high pressure or cryogenically.
- From: "Bob Eld" <nsmontassoc@xxxxxxxxx>
- Date: Sun, 30 Dec 2007 09:04:42 -0800
"Eeyore" <rabbitsfriendsandrelations@xxxxxxxxxxx> wrote in message
news:477760ED.B9D4B5A6@xxxxxxxxxxxxxx
I never was that brilliant at using the gas laws.http://www.prnewswire.com/cgi-bin/stories.pl?ACCT=104&STORY=/www/story/07-11
Any ideas (or calculations ideally!) how much energy would be needed to
compress stp hydrogen to the 350 or 700 bar figures mentioned here ?
-2002/0001761919&EDATE=
I know it depends on temperature rise too, but even assuming it could be
achieved isothermally ? with high efficiency pumps just how much energy
would it take to compress say 1kg or 100kg (1 tonne) of H2 to 350/700
bar ?
Given the phase change additional to LH2, I shudder to think about that
one.
Graham
For adiabatic compression: W = (n/(n-1) * Po*Vo * [(P1/Po) ^ ((n-1)/n)) -
1].
Where, W = Work in J/kg; Po = initial pressure in N/M^2; P1 = final
pressure in N/M^2; Vo = initial specific volume in M^3/kg; n = ratio of
specific heats.
For H2, n = 1.41; Vo = 11.11 M^3/kg
To compress H2 to 800Bar, requires approx. 23 MJ/kg.
Have fun!
.
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