consistency enthalpy air and mixture N2 O2

[Damiano Auliano]

Hello,

I have computed the mass and molar enthalpy at 1 bar and 25 degC by using 'Air' as working fluid. I have also computed it by considering individually the nitrogen and oxygen with relative molar fraction, but the result is different. Does anyone know the reason?

[Ian Bell]

Well, the first point is that the dry air used also has argon in it.

Second point: "Air" is air treated as a pseudo-pure fluid, which is fundamentally different than a mixture, and the reference state is not the same

Third point: reference states; that's why your values are different. They are handled differently in each case.

On Wed, Feb 8, 2023 at 7:29 AM Damiano Auliano <damiano...@gmail.com> wrote:

Hello,

I have computed the mass and molar enthalpy at 1 bar and 25 degC by using 'Air' as working fluid. I have also computed it by considering individually the nitrogen and oxygen with relative molar fraction, but the result is different. Does anyone know the reason?

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