Sensitivity Analysis
We can use Aspen to get an idea of how sensitive (how much our process changes) our process is to
a changing variable. We will use this feature to get a list of the liquid-liquid equilibria for a water-
VA-AA system. We will later put this on a ternary diagram.
To set the sensitivity, expand "Model Analysis Tools" and click on Sensitivity. Add a new object.
You will then need to add FORTRAN variables to calculate your data. Don't despair. We won't be
using any heavy duty FORTRAN and you shouldn't need much more than what is in this tutorial.
Just so you know, basic statements are much like any other programming language. y = 2 (2+ 2x -
sin(x)/2)
x-1
would be written
y = 2*(2+2*x-sin(x)/2)**(x-1)
. But again, you probably won't
need all of that.
We want to examine 6 variables, the mole fractions of each component in the 2 liquid streams. Select
new to enter in each of the variable definitions.
页码,3/15Aspen Plus Tutorial 6
2005-2-24http://www.che.utexas.edu/~che473k/aspen/aspentutor6.htm
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