Hi,
For people working in chemical engineering applications the main limitation with OpenModelica, I think, is the lack of Medium definitions (in fact the complexity of Modelica.Fluid is also a strong limitation). HelmholtzMedia is very powerful but has few fluids implemented and CoolProp is difficult to run. And for many substances transport properties are missing.
I have done a fork of HelmholtzMedia where I am transfering the fluids information from CoolProp and adding, when necessary, transport properties. You will find the fork here
I hope the work can be useful. I want also to thank Matthis Thorade for his encouragement.

Carlos