Análisis e Interpretación de resultados

1. Open the Workbook for the main case to access the calculated results for all streams and operations.

2. Click the Material Streams tab.

Figure 1.99

Enter Parent Simulation Environment icon

3. Click the Compositions tab.

Using the Object Navigator

In this section, you will use the Object Navigator to view properties for a particular stream or operation. The Object Navigator allows you to quickly access the property view for any stream or unit operation at any time during the simulation.

1. To open the Navigator, do one of the following: • Press F3.

• From the Flowsheet menu, select Find Object. • Click the Object Navigator icon.

The Object Navigator view appears:

The UnitOps radio button in the Filter group is currently selected, so only the Unit Operations appear in the list of available objects. 2. To open a property view, select the operation in the list and click the

View button, or double-click on the operation.

Figure 1.100

Figure 1.101

• To change which objects appear, select a different radio button in the Filter group.

• To list all streams and unit operations, select the All button. 3. You can also search for an object by clicking the Find button.

When the Find Object view appears, enter the Object Name, then click the OK button. UniSim Design opens the property view for the object.

Using the Databook

The UniSim Design Databook provides you with a convenient way to examine your flowsheet in more detail. You can use the Databook to monitor key variables under a variety of process scenarios, and view the results in a tabular or graphical format.

For this example, the effects of LTS temperature on the Sales Gas dew point and flow rate, and the Liquid Product flow rate will be examined.

Defining the Key Variables

Before opening the Databook, close the Object Navigator or any property view you might have opened using the Navigator. 1. To open the Databook, do one of the following:

• Press CTRL D.

• Open the Tools menu and select Databook. The Databook appears as shown below.

Figure 1.102

You can start or end the search string with an asterisk (*), which acts as a wildcard character. This lets you find multiple objects with one search. For example, searching for VLV* will open the property view for all objects with VLV at the beginning of their name.

3. Click the Insert button.

The Variable Navigator view appears.

4. In the Object Filter group, select the UnitOps radio button. The Object list will be filtered to show unit operations only.

5. In the Object list, select LTS.

The Variable list available for the LTS appears to the right of the Object list.

6. In the Variable list, select Vessel Temperature.

UniSim Design displays this variable name in the Variable

Description field.

7. Click the OK button to add this variable to the Databook.

Figure 1.103

Figure 1.104

The Variable Navigator is used extensively in UniSim Design for locating and selecting variables.

The Navigator operates in a left-to-right manner. The selected Flowsheet determines the Object list; the chosen Object dictates the Variable list; the selected Variable determines whether any Variable Specifics are available.

The new variable Vessel Temperature appears in the Databook.

Continue adding variables to the Databook.

8. Click the Insert button, and the Variable Navigator reappears. 9. In the Object Filter group, select the Streams radio button. The

Object list is filtered to show streams only. 10. In the Object list, select SalesDP.

The Variables list available for material streams appears to the right of the Object list.

11. In the Variable list, select Temperature.

12. In the Variable Description field, change description to Dew

Point, then click the Add button.

The variable now appears in the Databook, and the Variable Navigator view remains open.

Figure 1.105

13. Repeat the previous steps to add the following variables to the Databook:

• SalesGas stream; Molar Flow variable; change the Variable

Description to Sales Gas Production

• LiquidProd stream; Liq Vol Flow@Std Cond variable; change

the Variable Description to Liquid Production

14. Click the Close button to close the Variable Navigator view. The completed Variables tab of the Databook appears as shown below.

Creating the Data Table

In this section you will create a data table to display the variables. 1. Click the Process Data Tables tab.

2. In the Available Process Data Tables group, click the Add button. UniSim Design creates a new table with the default name

ProcData1.

Figure 1.107

The four variables that were added to the Databook appear in the table on this tab.

3. In the Process Data Table field, change the name to Key

Variables.

4. Activate each variable by clicking on the corresponding Show checkbox.

5. Click the View button to view the Key Variables Data table, which appears below.

You will access this table again later to demonstrate how its results are updated whenever a flowsheet change is made.

6. For now, click the Minimize icon in the upper right corner of the Key Variables Data view.

UniSim Design reduces the view to an icon and places it at the bottom of the Desktop.

Using the Data Recorder

In this section you will use the Data Recorder to automatically record the current values of the key variables before making any changes to the flowsheet.

Figure 1.109

Figure 1.110

1. On the DataBook view, click the Data Recorder tab.

When using the Data Recorder, you first must create a Scenario containing one or more of the key variables, then record the variables in their current state.

2. In the Available Scenarios group, click the Add button. UniSim Design creates a new scenario with the default name Scenario 1. 3. In the table, activate each variable by clicking on the corresponding

Include checkbox.

4. Click the Record button to record the variables in their current state.

The New Solved State view appears, prompting you for the name of the new state.

5. Enter the new name Base Case, then click OK.

The New Solved State view close and you return to the Databook

Figure 1.111

view.

6. In the Available Display group, select the Table radio button. 7. Click the View button.

The Data Recorder appears, displaying the values of the key variables in their current state.

Now you can make the necessary flowsheet changes and these current values remain as a permanent record in the Data Recorder unless you choose to erase them.

8. Click the Minimize button to reduce the Data Recorder to an icon. 9. Click the Restore Up icon on the Key Variables Data view to restore

the view to its original size.

Modifying the ColdGas Stream

In this section, you will change the temperature of stream ColdGas (which determines the LTS temperature) and view the changes in the process data table.

1. Click the Object Navigator icon on the toolbar. The Object Navigator view appears

2. In the Filter group, select the Streams radio button.

3. In the Streams list, select ColdGas, then click the View button.

Figure 1.113

Minimize icon

Restore Up icon

The ColdGas property view appears.

4. Ensure that you are on the Worksheet tab, Conditions page of the property view.

5. Arrange the two views, as shown below, by clicking and dragging on their title bars.

Currently, the LTS temperature is 0oF. The key variables will be

checked at 10oF.

6. In the ColdGas Temperature cell, type 10oF.

UniSim Design automatically recalculates the flowsheet. The new

Figure 1.114

results are shown below.

The change in Temperature generates the following results: • The Sales Gas flow rate has increased.

• The Liquid Product flow rate has decreased.

• The sales gas dew point has increased to 15.9oF. This

temperature no longer satisfies the dew point specification of

15oF.

7. Click the Close icon on the ColdGas stream property view and return to the Databook.

Recording the New Variables in the Databook

In this section you will record the key variables in their new state. 1. Click the Data Recorder tab in the Databook.

2. Click the Record button, and the New Solved State view appears. UniSim Design provides you with the default name State 2 for the new state.

3. Change the name to 10F in LTS, then click the OK button to accept the new name.

Figure 1.116

4. Click the View button and the Data Recorder appears, displaying the new values of the variables.

5. Click the Close icon on the Data Recorder, then on the Databook, and finally on the Key Variables Table.

6. Save the case.

The basic simulation for this example has now been completed. You can continue with this example by proceeding to the Optional Study

sections, or you can begin building your own simulation case. In the Optional Study, you will use some of the other tools available in UniSim Design to examine the process in more detail.