Joule-Thomson Cooler

[GJvapoer]

Hello engineers
I need some help and advice!

I am creating some kind of Joule-Thomson cooler.
Conditions: I have pure Nitrogen in a closed tank under 6000 psi pressure and 190 deg C. When we open the valve the gas will flow in the pipe and cool down by Joule-Thomson effect.

I know that temperature change depends on the pressure drop.
So my question is: How can I calculate the Temperature change as a function of Flow Rate (pressure drop per second) for my conditions (6000psi, 190 degC)?! I was searching it in some books and internet, but I could find any formula how to do it.

I found this diagram; I need the same for my conditions.


We can calculate Joule-Thomson coefficient at 6000psi, 190degC right, but there is no time stamp!

Thanks to everybody for any help in advance!

[Patrickclouds]

do you think that the mass flow in this diagramm is the result of a calculation?
i think they used a mass flowmeter to messure the massflow like this:
http://vacuumshopper.stores.yahoo.net/500slpm.html
http://westernpumpsafrica.com/flow%20meters.html

[Patrickclouds]

In My opinion You can only See The massflow in log Ph Diagramm along The lines. During your calculation you see the needed massflow to cool a heat at a choosen Temperaturen.