For example if I use a throttling valve in order to cool a gas by using the joule thomson effect, how can I adjust the valve so that the gas reduces its pressure to a desired value?
For example if the gas is flowing through a pipe which has a diameter of 20 mm, when the gas has a pressure of 300 bar before the valve, what is the difference when I want to reduce its pressure to 50 bar or 10 bar? I guess what matters is the reduction of the cross section area of the pipe but how can i make the necessary calculations for this?
Use Porous Plug .
For calculation as H1=H2
So
Internal energy+Flow energy = Constant
P1V1+U=P2V2+U
So V≈A×L
P1A1=P2A2
A≈d^2
P1d1^2=P2d2^2
You can get value of cross section or diameter ig.
You must know the valve characteristics, that is its Cv to calculate the flow rate through the valve when the pressure drop is 300 - 50 = 250 bar and 300 - 10 = 290 bar. In any case, also you must take into account the expansion factor Y of the gas passing through the valve. For these high pressure drops, probably the valve will have critical pressure and the maximum pressure drop that you can achieve will be approximately 150 bar.
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