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The MG Pony
29-06-2014, 02:23 PM
To understand I am building a methane digester system, and am going to store the gas at 24.13Bar (350psi) in 3 * 100 pound lp tanks 0.2M^3 (7.05cubic feet)

My feed stock will be at .69Bar (10 psi) ruffely and cool at say 10c (50F), so far my calculations tell me I'll have a 10.7 compression ratio and temp lift will be near 204C (400F) does this sound right to you all>

Rob White
29-06-2014, 03:35 PM
To understand I am building a methane digester system, and am going to store the gas at 24.13Bar (350psi) in 3 * 100 pound lp tanks 0.2M^3 (7.05cubic feet)

My feed stock will be at .69Bar (10 psi) ruffely and cool at say 10c (50F), so far my calculations tell me I'll have a 10.7 compression ratio and temp lift will be near 204C (400F) does this sound right to you all>


I'm not familiar with NH3 R50 but I've been trying to work
out your numbers and either I'm completely wrong and have
missed the point or your numbers are wrong?

Methane at just under 1bar (10psi) raised in pressure to over 24 bar (350psi)
is a pump ratio of 24? And as for the temperature lift, it is completely off
my chart at 204degC.

The chart I was using would not let me calculate the Isentropic efficiency and your
numbers seem to be more Adiabatic and that is impossible???

I found this http://petrowiki.org/Compressors


Regards

Rob

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The MG Pony
29-06-2014, 04:39 PM
I am pumping a 10c degree gas stream at 24.7psia to 264.7psia

so I could well be wrong as I am pretty rusty at the perfect gas law

The MG Pony
29-06-2014, 04:42 PM
I had no charts so was doing it via the perfect gas laws on paper all my info won't let me go about the -98c mark!

Rob White
29-06-2014, 05:23 PM
I had no charts so was doing it via the perfect gas laws on paper all my info won't let me go about the -98c mark!

I agree, that was my struggle also (looks like I was using a similar chart).

Does the web link offer you any further information.
I'f I'm honest I struggle with perfect gas laws, so I might
not be the best to help, hopefully others will have a better
scientific mind and will be able to help.

Rob

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