Aspen Plus Getting Started Using Equation Oriented Modeling

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Equation Oriented Modeling is a different strategy for solving your flowsheet
simulations in Aspen Plus. Configuration of the flowsheet works the same way
as previous versions of Aspen Plus, but you choose a different solution
strategy for your models.
Equation Oriented Modeling is a very effective way of solving certain kinds of
problems, such as:
the simulation of highly heat-integrated or recycled processes;
process optimization;
model tuning via parameter estimation and data reconciliation.