Joule-Thomson Coefficient in Excel

[Cameron Fulton]

Hi,

I'm trying to tabulate the Joule-Thomson coefficient for natural gas using Coolprop.

I will settle for properties on methane as an approximation.

Honestly I don't know where to start. Do I have to derive it somehow? Or is it an output option? If someone could give me a formula I'd be super-grateful. 

Thanks in advance,

Cam

[Ian Bell]

Hi Cam, the good news is that the Joule-Thomson coefficient is not too complicated to define: https://en.wikipedia.org/wiki/Joule%E2%80%93Thomson_effect#The_Joule.E2.80.93Thomson_.28Kelvin.29_coefficient 

And then you can get the Joule-Thomson coefficient from the single-phase derivative: http://www.coolprop.org/coolprop/HighLevelAPI.html#partial-derivatives .  Your call would be:

PropsSI('d(T)/d(P)|Hmass','P',101325,'T',300,'Water')

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[Cameron Fulton]

Thanks so much, Ian! Works like a charm.

On Friday, 12 May 2017 17:09:45 UTC+12, Ian Bell wrote:

Hi Cam, the good news is that the Joule-Thomson coefficient is not too complicated to define: https://en.wikipedia.org/wiki/Joule%E2%80%93Thomson_effect#The_Joule.E2.80.93Thomson_.28Kelvin.29_coefficient 

And then you can get the Joule-Thomson coefficient from the single-phase derivative: http://www.coolprop.org/coolprop/HighLevelAPI.html#partial-derivatives .  Your call would be:

PropsSI('d(T)/d(P)|Hmass','P',101325,'T',300,'Water')

On Thu, May 11, 2017 at 7:54 PM, Cameron Fulton <camero...@gmail.com> wrote:

Hi,

I'm trying to tabulate the Joule-Thomson coefficient for natural gas using Coolprop.

I will settle for properties on methane as an approximation.

Honestly I don't know where to start. Do I have to derive it somehow? Or is it an output option? If someone could give me a formula I'd be super-grateful. 

Thanks in advance,

Cam

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