Information Technology Reference
In-Depth Information
Figure 1.18
Object manager.
are: definition of a set of properties to be displayed, regression of a data set to a
thermodynamic model, and specification of the value of a block output variable. This
type of input is managed through use of the Object Manager. These situations typically
begin with the identification of a function, such as a regression, followed by a series
of choices and specifications. An example of the use of the Object Manager for a
Calculator block, which is used for in-line calculations, is given in Figure 1.18. The
user creates an ID such as C-1, which is followed by all the input forms required,
including association of calculation variables to flowsheet variables and definition, in
Fortran, of the calculation details.
1.13 PLOTTING RESULTS
Aspen Plus has a plotting facility accessed through the Plot menu. The facility either
provides the selection of independent and dependent variables manually or by means
of a Plot Wizard, which permits the user to select a preconfigured plot. As an example,
after obtaining a converged solution to a distillation column, selecting the Plot Wiz-
ard, and pushing the Next button, a collection of distillation-oriented plots, shown in
Figure 1.19 is available. Selecting the Comp plot produces Figure 1.20, which shows
the change in vapor composition through the column. For situations where preconfig-
ured plots are not available but a display of tabular output is available, such as the
results of a sensitivity analysis (details in Chapter Five), one may select a column of
data and assign it to either the
x
or
y
coordinate. It is also possible to assign two vari-
ables to the
y
coordinate by holding down the control key when selecting the columns
of data that are to be employed. If the scale or title of an axis or title of a plot is
