Reboiler Duty

4-6 • Performing a Sensitivity Analysis Getting Started Building and Running a Process Model

Do not close the dialog box. Instead, define the next variable,

QREB.

7 In the Variable name field, select <New>.

Note: You can also right-click on the Variable name field and

from the shortcut menu, select Create.

The New Item dialog box appears.

8 Type QREB and click OK.

Define QREB to be the reboiler duty for Block B1.

9 In the Category area, select Blocks.

10 In the Type field, select Block-Var.

11 In the Block field, select B1.

12 In the Variable field, select REB-DUTY.

13 Click Close.

You have now defined QCOND and QREB to be the condenser

duty and reboiler duty for block B1.

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

sheet reappears with the three defined calculated variables, XMCH,

QCOND, and QREB listed.

Next, specify the range, increment size, and label for the phenol

flow rate manipulated variable.

1 Click or click the Vary tab.

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

sheet appears.

Define the phenol flow rate (Stream 2) to vary from 1200

lbmol/hr to 2000 lbmol/hr in increments of 100 lbmol/hr.

2 In the Variable number field, select 1.

3 In the Type field, select Stream-Var.

4 In the Stream field, select 2.

5 In the Variable field, select MOLE - FLOW.

6 In the Values for varied variable area, select Overall range

and enter the following values:

Дата добавления: 2015-08-20