solving Joule-Thompson pressure drop 4

[Davidowitz]

I need help solving a problem, probably with the Joules- Thompson effect. I know that if I have a pressure reducing valve (regulator), when I increase the inlet pressure by 300 psi, for the same outlet pressure, I get a temperature drop of 21 degrees F. I need the equation showing this. I'm changing the inlet from 600 psi to 900 psi, and the outlet pressure remains 350 psi, how would I demonstrate the associated temperature drop?

 

[btrueblood]

Milton,

You are correct; I should know better than to get too detailed without cracking the thermo book.