Example 2.13: Calculate Joule-Thompson coefficient of
hydrogen when it is expanded from 20 bar to 5 bar at 100 °K. Critical pressure and critical temperature
are 12.5 atm and 23.25 °K, respectively.
Solution
$
Initial enthalpy, h (20 bar and 100 °K) = 1546 J/g.
$
Final temperature (5 bar and 1546 J/g)
= 98.03 °K.
$
Joules-Thompson coefficient μj
(Equation 2.43):
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