if isenthalpic process meaning delta H = 0 then why does is there a temperature change across a throttle valve in a vapor compression cycle ?

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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if isenthalpic process meaning delta H = 0 then why does is there a temperature change across a throttle valve in a vapor compression cycle ? 

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This question is based on the concept of Joule Thomson coefficients from thermodynamics.

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But if delta H= CpDT then how do changing the temperature can maintain constant enthalpy 

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