Gas Blending Math (He and Nitrox)

[jeepster0000]

Does anyone actually know the formula with the Z-factor included. I know the formula is a PITA but I am writing my own blending program so I want it for that. I have the TDI advanced gas blending and service manual but it only uses the ideal gas law. I should know this from my physical chemistry class, but I forgot and I have to go and find my book. Help me if you can.
Thanks
ADAM

 

[blacknet]

Hello,

Yes I have it, give me a few days and i'll post it. There happens to be 5 variables to work with and the main equasion with around 5 sub equasions to solve. I used the table pasted above and doing the lookup method. It's alot easier than doing the math.

Ed

 

[voidware]

The easy way to do this is with liquid gases.

1 cup liquid nitrogen
2 1/2 cups liquid helium
1 1/3 cups liquid oxygen
dry ice to taste
shake well. Serve chilled.

there no worries.

Brandon

 

[blacknet]

Hello,

Sorry it's taken so long to reply.

Beattie-Bridgeman equation of state
(Air from - 145 ¡ãC to + 200 ¡ãC)

p * V^2 = R * T * [ v + 0.04611 * (1 + (0.01101/V)) * (1(4.34*10^4)/(*T^3))

p = pressure, atm
v = molecular volume, lit/mol
R = gas constant 0,08205 lit¨Zatm/mol¨ZK
T = temperature, K.


And I prefer mine stirred not shaken.

Ed

 

[jeepster0000]

Awesome thank you so much. Now I will write a progam and see how it tests out.