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Sensitivity Block

Overhead Vapor | Creating a New Simulation | Operation Block | Specifying Data to be Reported | Parameter Value Units | Parameter Value Units | Examining Simulation Results | Creating Reports | Saving Your File and Exiting Aspen | Opening an Existing Simulation |


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4-4Performing a Sensitivity Analysis Getting Started Building and Running a Process Model

The Model Analysis Tools | Sensitivity | S-1 | Input | Define

sheet appears:

This sensitivity analysis will generate a data table. The first column

will contain a user-specified range of input values for the phenol

flow rate. Three other columns will contain calculated results for

MCH distillate product purity, the condenser duty, and the reboiler

duty.

In the Define sheet, define names for each of the calculated

variables (product purity, condenser duty, reboiler duty). In the

Vary sheet, specify the range and increments for the manipulated

variable (phenol flow rate). In the Tabulate sheet, set up the

format you want for the data table.

Start with the definition of the MCH distillate product purity

variable.

1 On the Define sheet, click New.

The Create new variable dialog box appears.

2 Type XMCH and click OK.

The Variable Definition dialog box appears. Define XMCH to

be the mole fraction of MCH in Stream 3 as follows.

3 In the Category area, select Streams.

4 In the Reference area, click the Type field and select Mole-

Frac.

As you complete the specifications in this dialog box, more

fields necessary to complete the variable definition will appear.

5 In the Stream field, select 3.


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