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CoolProp / CoolProp

Thermophysical properties for the masses
http://coolprop.org/
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Addition of HFO blends #1553

Open inamdarharshad opened 6 years ago

inamdarharshad commented 6 years ago

Chemours has made fluid properties for some of their HFO blends publicly available on [https://www.chemours.com/Refrigerants/en_US/products/Opteon/index.html](their website). A software tool „Chemours Refrigerant Expert Tool“ is made freely available. This software creates tables for saturated, superheated, or subcooled fluid and provides thermodynamic and transport properties for some of their blends. REFPROP v9.1 can be used to calculate properties for these blends, but these calculations are based on theoretically derived interaction parameters. These estimated parameters result in erroneous calculations. For example, REFPROP v9.1 calculates a temperature glide of almost 7 °F for R–452B, where the actual glide is about 2 °F. Could these blends be added to CoolProp?

jowr commented 6 years ago

Except for incompressible fluids, we do not really fit any parameters but rather implement equations and parameters published in papers. Would you be able to point us to coefficients and equations?

ibell commented 6 years ago

So far as I am aware, there are no means for theoretical derivations of interaction parameters, but there are estimation schemes enabled in REFPROP for some mixtures. In almost all cases the interaction parameters must be fit to experimental data. The updated version of the HMX.BNC available on the REFPROP FAQ page has updated interaction parameters. Also, you always have to ask tough questions about the accuracy of the experimental data that underlie the "reference" values for the glide. Some of the experimental data used for some of these calculations are bit questionable.

On Sun, Sep 24, 2017 at 4:03 AM, Jorrit Wronski notifications@github.com wrote:

Except for incompressible fluids, we do not really fit any parameters but rather implement equations and parameters published in papers. Would you be able to point us to coefficients and equations?

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inamdarharshad commented 6 years ago

Since this is a new blend, I do not have equations of state for the mixtures.