Information Technology Reference
In-Depth Information
Figure 1.12
Global property method.
of parameters. As an example, if the Data Browser topic Properties/Parameters/Binary
Parameters is selected and the listing Uniq-1 is clicked, Figure 1.13 appears. This shows
the values of Aspen Plus-supplied parameters for each binary pair and the source of
the data used in the regression. In Figure 1.13, note that the source of equilibrium
data for each binary pair is identified. A selection of data sources is available by
choosing the tab Databanks, which produces Figure 1.14. In the current example,
section S-1 contains the extractor, and it is therefore important that the data source be
liquid-liquid equilibrium data. Section S-2 involves a distillation column; hence the
binary parameters source is vapor-liquid equilibrium data.
1.9 STREAMS
Pushing the Next button moves the input sequence to stream data. All feed streams
are defined using a display such as that given in Figure 1.15. The data entry is very
straightforward and provides a user with the possibility of changing the units of both
the material flow and the state variables. For a stream of a single component or several
components, the number of degrees of freedom calculated by the Gibbs phase rule
applies:
F
=
C
−
P
+
2
