Re: [coolprop-users] Standard enthalpy of formation

[Ian Bell]

Please see FAQ number 1: https://github.com/CoolProp/CoolProp/blob/master/FAQ.md 

If you like, you could set it to be so.

On Wed, Feb 3, 2021 at 4:16 AM Enzo <vincen...@gmail.com> wrote:

The standard enthalpy of formation of any element in its standard state is zero by definition but coolprop does not provide 0. For instance in the case of Oxygen the value I get is not 0.

print(CP.PropsSI('Hmolar','P',101325,'T',298.15,'O2'))

Why?

Thanks for your help

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[Enzo]

Thank you for you answer. What is the reference state used by coolprop as default?

[Ian Bell]

It depends.  In general reference states are set to be the same as NIST REFPROP.

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