Nitrogen Temperature according to pressure release 1

[Nukie]

I would like to know how to calculate the delta T for gaseous nitrogen when I depressurize it thru a regulator, let say the cylinder is at 2500psi and the output of the regulator is 125 psi.

Any formulas and references are welcome

Thanks

 

[StoneCold]

This would just be an adiabatic expansion of a gas. Most thermo books have this information or you can check this website out.

http://www.nd.edu/~ed/Joule_Thomson/background_adiabatic_expansion.htm

 

[25362]

From published information the J-T (isoenthalpic throttling) coefficient for nitrogen at 25 [sup]o[/sup]C, for 8.5 ata : 0.2155, and assuming a J-T coeff. linear relation with pressure, expressed as 0.2155 - 7.4 x 10[sup]-4[/sup] P, we can estimate the cooling effect after expansion by integrating between 8.5 and 170 ata of:
(0.2155 - 7.4 x 10[sup]-4[/sup] P) dP =
0.2155 (8.5-170) - 7.4 x 10[sup]-4[/sup] (8.5[sup]2[/sup] - 170[sup]2[/sup])/2 = -34.8 + 10.7 =
-24.1[sup]o[/sup]C.

I hope this exercise is of value. Good luck!