Throttling Process


by ahmad.hasan
Tags: process, throttling
ahmad.hasan
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#1
May5-06, 06:28 AM
P: 12
dear all

What is the throttling Process?
what is Joule homson Effect?
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Cyrus
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#3
May5-06, 02:28 PM
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A throttling process is a process that is isenthalpic. Thus, [tex] h_1 = h_2 [/tex]. This means that the following is also true, [tex] u_1 + P_1 v_1 = u_2 + P_2 v_2 [/tex]. 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.

ahmad.hasan
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#4
May7-06, 11:36 PM
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.
Cyrus
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#5
May7-06, 11:52 PM
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Yes, that is exactly what it is.

Edit: wait, what do you mean by expansion? Is it going through a nozzle?
ahmad.hasan
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#6
May8-06, 01:51 AM
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.
Cyrus
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#7
May8-06, 11:30 AM
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Yes, it is a throttling valve.
ahmad.hasan
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#8
May8-06, 10:59 PM
P: 12
what is the value of joule-thomson coefficient for methane


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