# Throttling Process

Tags: process, throttling
 P: 12 dear all What is the throttling Process? what is Joule homson Effect?
 P: 4,780 A throttling process is a process that is isenthalpic. Thus, $$h_1 = h_2$$. This means that the following is also true, $$u_1 + P_1 v_1 = u_2 + P_2 v_2$$. So if you drop pressure in a throttling value, you increase the internal energy, and vise versa. The Joule -thomson- effect deals with the fact that as you expand a gas it looses temperature. Note that for hydrogen; however, it gains temperaturee as it expands. This makes hyrdogen particularly dagnerous.
P: 12

## Throttling Process

Pressure drops in CNG kit Pressure regulator from 300 bar to 4 bar in 1st chamber due to expansion is it throttling process? temperature also drops in it.
 P: 4,780 Yes, that is exactly what it is. Edit: wait, what do you mean by expansion? Is it going through a nozzle?
 P: 12 no it is going throug valve (sloninoid valve) from storage cylinder through high pressure pipe into solinoid valve and then in the 1st stage chamber of pressure regulator.
 P: 4,780 Yes, it is a throttling valve.
 P: 12 what is the value of joule-thomson coefficient for methane

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