Utilize molar gas constant in Modelica.Media.Interfaces.{TemplateMedium, PartialLinearFluid}.BaseProperties

[beutlich]

Utilize the molar gas constant R from Modelica.Constants instead of different approximations.

[thorade]

This would require reading the publication, because if a different value of the gas constant was used in the publication, it must also be used in the implementation to get matching results.

[HansOlsson]

Looks good.

[mestinso]

I agree with @thorade here. Changes in Modelica/Media/package.mo make sense and should be implemented. However, for the R134a and Moist air reference cases, it is arguably wrong since this will cause the results to change. The R values should be considered fossilized/internal factors that you shouldn't care about externally. You either need two changes (two wrongs making a right) or no changes at all to keep it consistent with the publication. I would vote for the latter.

[beutlich]

Changing it in Modelica.Media.Interfaces.PartialLinearFluid.BaseProperties also affects Modelica.Media.CompressibleLiquids.LinearColdWater and Modelica.Media.CompressibleLiquids.LinearWater_pT_Ambient via inheritance.

@casella Acceptable for you?

[casella]

Changing it in Modelica.Media.Interfaces.PartialLinearFluid.BaseProperties also affects Modelica.Media.CompressibleLiquids.LinearColdWater and Modelica.Media.CompressibleLiquids.LinearWater_pT_Ambient via inheritance.

@casella Acceptable for you?

Absolutely!

In fact, those models do not really need a value for R, it is only provided because the interface asks for it. I'm not sure why we put some rounded numbers, but I guess that was the reason.

Please go ahead