Helping bubble points and dew points at given pressure to converge about feos

[prehner]

You can pass verbosity=Verbosity.Iter to see a bit more details of what is going wrong. However, calculating a bubble or dew point for given pressure that close to the critical point is difficult in general. FluidProp advertises these kind of calculations on their website, so I assume they put in a lot of effort to make their algorithms as robust as possible.

If you can rearrange your problem so that you evaluate bubble or dew points at given temperatures that would make it easier, or (although that is not a very satisfying solution) you can use a solver in Python to iterate the temperature until the bubble or dew point pressure matches your system pressure.

[LoGaL93]

great, thanks!