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[JaiEdi]

If you were to define advanced process modelling, e.g using gProms or Aspen - what would your definition be? What are the capabilities of advanced process modelling and what are the main limitations? 

[SilverShaded]

Your question really has no meaning.  All process simulators use similar thermodynamics routines but potentially different solving techniques.  The two main ones are sequential modular and equation oriented.

 

Which one is preferable depends on your point of view.  Sequential modular is regarded as slower to solve (not neccessarily true) but more robust, EO is regarded as faster to solve but convergence, particularly initial convergence can be problematic.

 

Hysys, Petrosim, Unisim, VMGSim use a hybrid solving technique which is partly EO on individual models and also uses back propagation of properties to avoid interactive local calculation procedures.  E.G. Other simulators would require an iterative loop to solve a desuperheater model where as Hysys et al.  can solve it directly.

In that sense i regard this type of solver as advanced and is thanks to the genius of Craig Morris of Hyprotech back in the day.

Edited by SilverShaded, 14 April 2021 - 01:44 AM.