Use an xStream Standard Fluid

xStream offers multiple fluid libraries for users to choose from in the Fluids panel of the Analysis Setup window. Each library has benefits and drawbacks.

If the model is defined using the ASME Steam, Chempak, or NIST REFPROP fluid libraries and is experiencing convergence problems, the user should simplify the model by choosing a fluid from the xStream Standard fluid library. The fluid models used for this library are simplified from those in the other libraries, and often allow xStream to find a solution more easily.

Once the user has a model that runs well using an xStream Standard fluid, they can return to the more complex fluid libraries. However, it should be noted that the increased accuracy of other fluid libraries are often outweighed by the increased run time associated with the more complex fluids.