Calculation the mixing enthalpy of the fluid LiBr-H2O?

[Hans-Herbert Dr. Vogel]

I am using the equation of state for the incompressibel
mixture of LiBr-H2O. In the original paper of Patek and Klomfar the
zero-points (Enthalpy and Entropy) for the mixture is chosen in the
state 50% (weight) and T=273.15 K. In CoolProp are selected zero
values for all concentrations in the state T=293.15 K and P=1 atm (reference).

I do not understand, how the calculation of the enthalpy of solution is
possibel with this defintion. I cannot calculate the mixing enthalpy, if
i am changing the concentration. I think that is only possible with the

definitions of Patek and Klomfar.

I would be glad about an answer.

Best wishes, Hans-Herbert

[Jorrit Wronski]

Dear Hans-Herbert

 

You found a design flaw in CoolProp – the enthalpy of mixing cannot be calculated and you an only compare states with similar concentrations.

 

I did not think about this properly when I designed the incompressible backend as I was only interested in pure fluids – the mixtures were included later.

 

Sorry to disappoint you.

 

 

 

 

Med venlig hilsen / Yours sincerely Jorrit Wronski Specialist Engineer, M.Sc., Ph.D.

DTU Science Park, Diplomvej 376, DK-2800 Kgs. Lyngby Phone: +45 45 16 04 10 / Dir. +45 45 16 04 26 / www.ipu.dk

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