Difference between revisions of "DWSIM/C2/Sensitivity-Analysis-and-Adjust/English"

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(Created page with "{|border=1 ||'''Visual Cue''' ||'''Narration''' |- | '''Slide Number 1''' '''Title Slide''' || Welcome to this tutorial on '''Sensitivity Analysis''' and '''Adjust''' in ''...")
 
 
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'''System Requirements'''
 
'''System Requirements'''
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|| This tutorial is recorded using,* '''DWSIM 5. 8 Update 3''' '''(Classic UI) '''and  
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|| This tutorial is recorded using,
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* '''Windows 10''' '''OS'''
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* '''DWSIM 5. 8 (Classic UI) Update 3'''and  
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* '''Windows 10 OS'''
  
 
But, this process is identical in '''Linux, Mac OS X '''or '''FOSSEE OS '''on''' ARM'''.
 
But, this process is identical in '''Linux, Mac OS X '''or '''FOSSEE OS '''on''' ARM'''.
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'''Prerequisites'''
 
'''Prerequisites'''
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|| To practise this tutorial you should know to -* Open a simulation file in '''DWSIM'''  
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|| To practise this tutorial you should know to -
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* Carry out '''rigorous distillation''' simulation
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* Open a '''simulation''' file in '''DWSIM'''  
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* Carry out '''rigorous distillation simulation'''  
 
* Add components to a '''flowsheet'''  
 
* Add components to a '''flowsheet'''  
 
|-
 
|-
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'''https:\\spoken-tutorial.org'''
 
'''https:\\spoken-tutorial.org'''
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|| The prerequisite tutorials are available on this website'''.'''
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|| The prerequisite tutorials are available on this website.
  
 
You can access these tutorials and all the associated files from this site.
 
You can access these tutorials and all the associated files from this site.
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And select '''Molar Fraction(Mixture) / Benzene.'''
 
And select '''Molar Fraction(Mixture) / Benzene.'''
 
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|-
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|| Go to the '''Parameters''' section.
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|| Go to the '''Parameters'''.
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|| Now, go to the '''Parameters''' section.
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|| Now, go to '''Parameters'''.
 
|-
 
|-
 
|| Enter '''Set-Point/Offset (Controlled Property) '''as''' 0.9901'''  
 
|| Enter '''Set-Point/Offset (Controlled Property) '''as''' 0.9901'''  
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|-
 
|-
 
|| Click on '''Distillate'''
 
|| Click on '''Distillate'''
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|| Let us check the distillate purity.  
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|| Let us check the '''distillate''' purity.  
  
 
Click on '''Distillate''' in the flowsheet.
 
Click on '''Distillate''' in the flowsheet.
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|| From the '''Property''' window, go to '''Input Data''' tab.
 
|| From the '''Property''' window, go to '''Input Data''' tab.
  
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Under '''Compound Amounts''' tab, we can see that the benzene composition is '''0.99'''.  
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Under '''Compound Amounts''' tab, we can see that the '''benzene''' composition is '''0.99'''.  
 
|-
 
|-
 
|| Click on the '''Distillation column'''.  
 
|| Click on the '''Distillation column'''.  

Latest revision as of 15:06, 5 February 2020

Visual Cue Narration
Slide Number 1

Title Slide

Welcome to this tutorial on Sensitivity Analysis and Adjust in DWSIM.
Slide Number 2

Learning Objectives

In this tutorial, we will learn to:
  • Determine the exact Reflux Ratio for a separation
  • Perform Sensitivity Analysis and Adjust operation
Slide Number 3

System Requirements

This tutorial is recorded using,
  • DWSIM 5. 8 (Classic UI) Update 3and
  • Windows 10 OS

But, this process is identical in Linux, Mac OS X or FOSSEE OS on ARM.

Slide Number 4

Prerequisites

To practise this tutorial you should know to -
  • Open a simulation file in DWSIM
  • Carry out rigorous distillation simulation
  • Add components to a flowsheet
Slide Number 5

Prerequisite Tutorials and Files

https:\\spoken-tutorial.org

The prerequisite tutorials are available on this website.

You can access these tutorials and all the associated files from this site.

Slide Number 6

Code Files

rigorous.dwxmz file used in the tutorial is provided as a Code file on this tutorial page.

Download the file from the Code Files link.

Slide Number 7

Problem solved in Prerequisite tutorial

Point to the Purity

This slide shows the problem solved using Rigorous Distillation.

The purity achieved was less than what was desired.

To improve the purity, we need to increase the reflux ratio.

Switch to DWSIM I have already opened DWSIM on my machine.
Point to the Simulation window Open the file rigorous dot dwxmz.
Click Distillate Click on Distillate in the flowsheet.
Cursor to the Editor Window Go to Property Editor Window.
Input Data >> Compound Amounts Under Input Data, click on Compound Amounts tab.
Highlight Benzene mole fraction is 0.988. Here the Benzene mole fraction is 0.988.

We would like to increase this to 0.99.

Let us attempt this by increasing the reflux ratio.
Click on Optimization option in the Menu bar To do so, click on Optimization option on the menu bar.
Click on Sensitivity Analysis Now click on Sensitivity Analysis option.

Sensitivity Analysis tab opens.

Highlight the 5 menus Here we can see five menus in the menu bar of Sensitivity Analysis.
Cursor to the Sensitivity Analysis window

Click on Sensitivity Studies.

Now click on Sensitivity Studies, if not already selected.

On my system, by default, it is already selected.

Point to four buttons under Case Manager Under Case Manager, we can see four buttons.
Click on New button Click on New button.

This will help in creating a new Sensitivity Analysis case.

Point to SACase0. We see the name SACase0.
Point to reflux ratio Here we want to increase the reflux ratio so as to get better purity.

Thus, reflux ratio is the independent variable.

Click on Independent Variables button Let us do this through the Independent Variables.

Under Sensitivity Analysis, click on Independent Variables tab.

Click on Object button Under Independent Variable 1, click on the drop-down against Object.
Click on DC-005 Select DC-005, the name of our distillation column.
Click on Property On the right hand side, click on the drop-down against Property.
Scroll down and click on Condenser_Specification_Value Now scroll down and select Condenser_Specification_Value.

It plays the role of the reflux ratio.

Recall that we want our reflux ratio to be greater than 2.317.
Lower limit >> 2.317 So, we will enter the Lower limit as 2.317
Upper limit >> 2.5 Change the Upper limit to 2.5
Number of Points >> 6 Change the Number of Points to 6
Click on Dependent Variable. Now under Sensitivity Analysis, click on Dependent Variables tab.
Click on Dependent Variable On the left hand side, we can see a column named Variables.
Under Variables, click on green Add button Below that, locate a green coloured plus button to Add new variables.

Click on it.

A new row appears.

Object >> Distillate Click on the drop-down against Object.

Select Distillate.

Property >> Molar Fraction (Mixture) – Benzene. Now click on the drop-down against Property.

Scroll down and select Molar Fraction (Mixture) – Benzene.

Click on Results >> Start Sensitivity Analysis Next click on the Results tab to the right of the Dependent Variables tab.

Then click on Start Sensitivity Analysis button.

Point to the Results section. We see the column getting simulated for reflux ratios, one by one.
Point to the Information section at the bottom. At the end of the simulation, we get the message Done.
Cursor to the Reflux Ratio values

Point to the Benzene compositions

Here we can see results for six reflux ratios, from 2.317 to 2.5

We also see the corresponding benzene compositions.

Click on Independent Variables tab

Number of Points >> 11.

Now under Sensitivity Analysis, click on Independent Variables tab.

Change the Number of Points to 11.

Click on Results. Again click on Results tab.
Click on Start Sensitivity Analysis button Click on Start Sensitivity Analysis button once again.

You can see that simulation runs to show eleven results this time.

Click Independent Variables

Type Lower Limit: 2.3719,

Upper Limit: 2.3902

We can see that the desired purity of 0.99 will be achieved between 2.3719 and 2.3902

Choose these as the lower and upper limits in Independent Variables.

Click on Results. Again click on Results tab.
Click on Start Sensitivity Analysis button Click on Start Sensitivity Analysis button once again.
Point to reflux ratio Here we get the reflux ratio value as 2.382.

This way we can determine the exact reflux ratio required for 0.99 purity.

Click on Chart tab We can also see these results in a graphical form.

Now under Sensitivity Analysis, click on Chart tab.

Click on Chart tab Draw option On the left of the window, click on the Draw button.
Point to the graph On the right, we can see the chart here.

This graph plots between Distillate composition vs condenser specification value.

That is, the reflux ratio.

File >> Save As >> sensitivity Let me save this simulation as sensitivity.
Close Now close the Sensitivity Analysis tab..
We have learnt to calculate the desired reflux ratio by trial and error method.
Object Palette >> Logical Ops DWSIM has a powerful method to directly calculate the reflux ratio.

It is called Adjust.

Now at the bottom of the main simulation window, click on Logical Ops tab.

Click on Controller Block >> drag and drop it >>click on Distillate Click on Controller Block.

Drag and drop it outside the column, below the distillate.

Now, click on it.

Point to the left On the left, we can see a tab displaying properties related to Adjust.
Linked Objects >> Manipulated Object >> DC-005 Under Linked Objects, click on the drop-down against Manipulated Object.

Now select DC-005.

Click on the drop-down against Manipulated Property.

Select Condenser_Specification_Value.

Next, click on the drop-down against Manipulated Property.

Then select Condenser_Specification_Value.

Click on the drop-down against Controlled Object.

Select Distillate.

Next, click on the drop-down against Controlled Object and select Distillate.
Click on the drop-down against Controlled Property.

Select Molar Fraction(Mixture) / Benzene.

Next, click on the drop-down against Controlled Property.

And select Molar Fraction(Mixture) / Benzene.

Go to the Parameters. Now, go to Parameters.
Enter Set-Point/Offset (Controlled Property) as 0.9901 Enter Set-Point/Offset (Controlled Property) as 0.9901 and press Enter.
Enter 0.9901 I shall enter a slightly larger number 0.9901.

I want you to think about why I have entered a slightly larger number.

Select the Solve Globally check box. Now, select the check-box against Solve Globally.
Then we will run the simulation.
Click on Solve Flowsheet button So, from the toolbar, click on Solve Flowsheet button.
Click on Distillate Let us check the distillate purity.

Click on Distillate in the flowsheet.

Cursor to Input Data tab

Compound Amounts >> Benzene composition 0.99

From the Property window, go to Input Data tab.

Under Compound Amounts tab, we can see that the benzene composition is 0.99.

Click on the Distillation column. Let us now check what reflux ratio is required for this.

To do this, click on the Distillation column.

Column Specs >> Condenser Under Column Specs, click on Condenser tab.
Compound >> 2.382 Under Compound, we see a value of 2.382

It is the same as what we obtained in the Sensitivity Analysis.

Save the file Let me save this simulation as adjust.
Let's summarize.
Slide Number 8

Summary

In this tutorial, we have learnt to:
  • Determine the exact Reflux Ratio for a separation
  • Performed Sensitivity Analysis and Adjust operation
I have some assignments for you.
Slide Number 9

Assignment 1:

Components: Acetone & Water

Thermodynamics: Raoult’s Law

Inlet Stream:

Flow Rate: 100 mol/s

Pressure: 1 atm

Mole Fractions:

Acetone = 0.7, Water = 0.3

Simulate this problem statement using a Distillation column.

Here we give different Compounds, feed conditions and Thermodynamics.

Slide Number 10

Column Configuration:

Number of stages: 13 (excluding total condenser)

Feed Stage: 8

Reflux Ratio: 0.70611

Mole flow rate of bottoms: 29.592 mol/s

Different Column Configuration
Slide Number 11

Assignment 2:

Perform sensitivity analysis on the simulated distillation column:

To find the reflux ratio such that mole fraction of water in bottoms is 0.99

Using Adjust/Controller Block, verify the results obtained using the analysis

Let us go to the next assignment.

Perform sensitivity analysis on the simulated distillation column.

To find the reflux ratio such that mole fraction of water in bottoms is 0.99

Using Adjust/Controller Block, verify the results obtained using the analysis.

Slide Number 12

About the Spoken Tutorial Project

Watch the video available at the following link.

http://spoken-tutorial.org/

It summarizes the Spoken Tutorial project.

Slide Number 13

Spoken Tutorial Workshops

The Spoken Tutorial Project Team conducts workshops and gives certificates.

For more details, please write to us.

Slide Number 14

Forum Slide

Do you have questions in this Spoken Tutorial?

Please visit this site

Choose the minute and second where you have the question.

Explain your question briefly.

Someone from the FOSSEE team will answer them.

Please post your timed queries in this forum.
Slide Number 15

DWSIM Flowsheeting Project

The FOSSEE team coordinates conversion of existing flowsheets into DWSIM.

We give honorarium and certificates for those who do this.

For more details, please visit this site.

Slide Number 16

Lab Migration Project

The FOSSEE team helps migrate commercial simulator labs to DWSIM.

We give honorarium and certificates for those who do this.

For more details, please visit this site

Slide Number 17

Acknowledgements

Spoken Tutorial and FOSSEE projects are funded by NMEICT, MHRD, Government of India.
Slide Number 18

Thanks

We thank the DWSIM team for making it as an open source software.

This tutorial was originally recorded by Prof Kannan Moudgalya in September 2015.

This is Kaushik Datta from IIT Bombay.

Thanks for joining.

Contributors and Content Editors

Kaushik Datta, Nancyvarkey

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