Liquid Air Phase Chart 1

[claybo]

I'm looking for a phase chart that shows temp as a function of pressure, for an 80%N2/20%O2 mixture of liquid air.

 

[TangoCleveland]

For $200 you can purchase a database from National Institute of Standards and Technology that includes air and may other components. Take a look at

http://www.nist.gov/srd/nist23.htm.

If you can be more specific about the temperature, pressure, and quality ranges you're looking at, I could probably get you some data.

Larry

 

[claybo]

Tango, this would be for a liquid air mix of O2 20%, N2 80%, with a pressure range, 5 to 25 psig. For instance, at a saturation press of 5 psi, what would be the temp? What would be the respective temperatures for pressure saturations of 5, 10, 15, 20, and 25 psig respectively?

 

[TangoCleveland]

For Liquid Air (N2 0.7812, O2 0.2096, Ar 0.0092 mol%), you'd have:
Vapor Phase Vapor Phase
Pressure Temperature
(psia) (°F)
5.0000 -332.72
10.000 -323.45
15.000 -317.32
20.000 -312.60
25.000 -308.69
30.000 -305.34
35.000 -302.38
40.000 -299.72
55.000 -292.99

Depending on the accuracy you want, your 80/20 mol% mixture is:
Vapor Phase Vapor Phase
Pressure Temperature
(psia) (°F)
5.0000 -332.92
10.000 -323.68
15.000 -317.56
20.000 -312.85
25.000 -308.96
30.000 -305.62
35.000 -302.67
40.000 -300.01
45.000 -297.59
50.000 -295.37
55.000 -293.30

Larry

 

[claybo]

Perfect! Would you mind doing the same calculations for LN2?
Thanks!

 

[TangoCleveland]

LN2 Saturation:

Pressure Temperature
(psia) (°F)
5.0000 -335.02
10.000 -326.05
15.000 -320.12
20.000 -315.55
25.000 -311.78
30.000 -308.53
35.000 -305.67
40.000 -303.10
45.000 -300.76
50.000 -298.60
55.000 -296.60

Reference is "NIST Standard Reference Database 23, Version 7.0".

Larry

 

[claybo]

Thanks again!