View source for DWSIM/C2/Sensitivity-Analysis-and-Adjust/English-timed

{|border=1
||'''Time'''
||'''Narration'''
|- 
|| 00:01
|| Welcome to this tutorial on '''Sensitivity Analysis''' and '''Adjust''' in '''DWSIM.''' 
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|| 00:08
|| In this tutorial, we will learn to:

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|| 00:11
||  Determine the exact '''Reflux Ratio''' for a separation

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|| 00:15
||  Perform '''Sensitivity Analysis''' and '''Adjust''' operation
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|| 00:19
|| This tutorial is recorded using,

'''DWSIM 5. 8 (Classic UI) Update 3'''and  '''Windows 10 OS'''

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|| 00:30
|| But, this process is identical in '''Linux, Mac OS X '''or '''FOSSEE OS '''on''' ARM'''.
|-
|| 00:38
|| To practise this tutorial you should know to -

Open a '''simulation''' file in '''DWSIM''' 

|-
|| 00:45
||  Carry out '''rigorous distillation simulation''' 

|-
|| 00:48
||  Add components to a '''flowsheet''' 
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||00:51
|| The prerequisite tutorials are available on this website.

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|| 00:55
|| You can access these tutorials and all the associated files from this site.
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|| 01:01
|| '''rigorous.dwxmz''' file used in the tutorial is provided as a '''Code file''' on this tutorial page.

|-
|| 01:09
|| Download the file from the '''Code Files''' link.
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|| 01:13
|| This slide shows the problem solved using '''Rigorous Distillation'''. 

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|| 01:18
|| The purity achieved was less than what was desired. 

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|| 01:23
|| To improve the purity, we need to increase the '''reflux ratio'''. 
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|| 01:28
|| I have already opened '''DWSIM''' on my machine. 
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|| 01:32
|| Open the file '''rigorous dot dwxmz.''' 
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|| 01:38
|| Click on '''Distillate '''in the '''flowsheet'''. 
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|| 01:41
|| Go to '''Property Editor Window.'''
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|| 01:44
|| Under '''Input Data''', click on '''Compound Amounts''' tab.
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||01:48
|| Here the '''Benzene mole fraction''' is '''0.988.'''

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|| 01:53
|| We would like to increase this to '''0.99'''.
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||01:57
|| Let us attempt this by increasing the '''reflux ratio'''. 
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|| 02:01
|| To do so, click on '''Optimization '''option on the menu bar.
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|| 02:07
|| Now click on '''Sensitivity Analysis '''option. 

'''Sensitivity Analysis '''tab opens. 
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|| 02:14
|| Here we can see five menus in the menu bar of '''Sensitivity Analysis.'''
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|| 02:20
|| Now click on '''Sensitivity Studies, '''if not already selected.

On my system, by default, it is already selected. 
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|| 02:30
|| Under '''Case Manager''', we can see four buttons.
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|| 02:34
|| Click on '''New '''button.

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|| 02:36
|| This will help in creating a new '''Sensitivity Analysis case. '''
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|| 02:41
|| We see the name '''SACase0.''' 
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|| 02:45
|| Here we want to increase the '''reflux ratio''' so as to get better purity. 

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|| 02:50
|| Thus, '''reflux ratio''' is the '''independent variable.''' 
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||02:54
|| Let us do this through the '''Independent Variables'''. 

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|| 02:58
|| Under '''Sensitivity Analysis, '''click on '''Independent Variables''' tab.
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|| 03:04
|| Under '''Independent Variable 1, '''click on the drop-down against '''Object.'''
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|| 03:10
|| Select '''DC-005''', the name of our '''distillation''' column. 
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|| 03:16
|| On the right hand side, click on the drop-down against '''Property.''' 
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|| 03:22
|| Now scroll down and select '''Condenser Specification Value.''' 

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|| 03:28
|| It plays the role of the '''reflux ratio'''. 
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||03:31
|| Recall that we want our '''reflux ratio''' to be greater than''' 2.317.'''
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|| 03:38
|| So, we will enter the '''Lower limit''' as''' 2.317'''
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|| 03:43
|| Change the '''Upper limit''' to '''2.5'''
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|| 03:47
|| Change the '''Number of Points''' to '''6'''
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|| 03:51
|| Now under '''Sensitivity Analysis, '''click on '''Dependent Variables''' tab. 
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|| 03:57
|| On the left hand side, we can see a column named '''Variables.''' 
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|| 04:03
|| Below that, locate a green coloured plus button to '''Add '''new '''variables'''. 

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|| 04:09
|| Click on it.  A new row appears. 
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|| 04:12
|| Click on the drop-down against '''Object.''' 

Select '''Distillate.''' 
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|| 04:20
|| Now click on the drop-down against '''Property.''' 

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|| 04:25
|| Scroll down and select '''Molar Fraction (Mixture) – Benzene.''' 
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|| 04:32
|| Next click on the '''Results''' tab to the right of the '''Dependent Variables''' tab.

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|| 04:38
|| Then click on '''Start Sensitivity Analysis '''button.
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|| 04:42
|| We see the column getting '''simulated''' for '''reflux ratios''', one by one. 
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|| 04:47
|| At the end of the '''simulation''', we get the message '''Done.''' 
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|| 04:52
|| Here we can see results for six '''reflux ratios''', from''' 2.317''' to '''2.5''' 

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|| 05:00
|| We also see the corresponding '''benzene''' compositions. 
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|| 05:05
|| Now under '''Sensitivity Analysis, '''click on '''Independent Variables '''tab.

Change the '''Number of Points''' to '''11'''. 
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|| 05:15
|| Again click on '''Results''' tab. 
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|| 05:18
|| Click on '''Start Sensitivity Analysis''' button once again. 

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|| 05:22
|| You can see that '''simulation''' runs to show eleven results this time.
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|| 05:28
|| We can see that the desired purity of '''0.99''' will be achieved between '''2.3719''' and '''2.3902'''

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|| 05:37
|| Choose these as the lower and upper '''limits''' in '''Independent Variables'''.
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|| 05:43
|| Again click on '''Results''' tab.
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|| 05:46
|| Click on '''Start Sensitivity Analysis''' button once again.
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||05:51
|| Here we get the '''reflux ratio''' value as '''2.382'''.

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|| 05:56
|| This way we can determine the exact '''reflux ratio '''required for '''0.99''' purity.
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|| 06:03
|| We can also see these results in a graphical form.

Now under '''Sensitivity Analysis, '''click on '''Chart '''tab.
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|| 06:13
|| On the left of the window, click on the '''Draw '''button. 
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|| 06:17
|| On the right, we can see the chart here. 

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|| 06:21
|| This graph plots between '''Distillate composition''' vs '''condenser specification value'''. 

That is, the '''reflux ratio'''. 
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||06:30
|| Let me save this simulation as '''sensitivity.''' 
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|| 06:37
|| Now close the '''Sensitivity Analysis''' tab.. 

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||06:42
|| We have learnt to calculate the desired '''reflux ratio''' by '''trial and error method'''.
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|| 06;46
|| '''DWSIM''' has a powerful '''method''' to directly calculate the '''reflux ratio. '''

It is called '''Adjust.''' 

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|| 06:55
|| Now at the bottom of the main '''simulation''' window, click on '''Logical Ops''' tab.
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|| 07:01
|| Click on '''Controller Block'''.

Drag and drop it outside the column, below the '''distillate'''. Now, click on it.
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|| 07:11
|| On the left, we can see a tab displaying properties related to '''Adjust.'''
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|| 07:17
|| Under '''Linked Objects,''' click on the drop-down against '''Manipulated Object.'''

Now select '''DC-005'''. 
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|| 07:28
|| Next, click on the drop-down against '''Manipulated Property.'''

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|| 07:34
|| Then select '''Condenser  Specification Value.'''
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|| 07:38
|| Next, click on the drop-down against '''Controlled Object''' and select '''Distillate.'''
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|| 07:46
|| Next, click on the drop-down against '''Controlled Property.'''

And select '''Molar Fraction(Mixture) / Benzene.'''
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|| 07:57
|| Now, go to '''Parameters'''.
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|| 08:00
|| Enter '''Set-Point/Offset (Controlled Property) '''as''' 0.9901''' and press '''Enter.'''
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|| 08:09
|| I shall enter a slightly larger number '''0.9901'''. 

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|| 08:14
|| I want you to think about why I have entered a slightly larger number. 
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|| 08:19
|| Now, select the check-box against '''Solve Globally'''.
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|| 08:24
|| Then we will run the '''simulation.'''
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|| 08:27
|| So, from the toolbar, click on '''Solve Flowsheet''' button. 
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|| 08:31
|| Let us check the '''distillate''' purity. 

Click on '''Distillate''' in the flowsheet.
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|| 08:37
|| From the '''Property Editor''' window, go to '''Input Data''' tab.

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|| 08:41
|| Under '''Compound Amounts''' tab, we can see that the '''benzene''' composition is '''0.99'''. 
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|| 08:49
|| Let us now check what '''reflux ratio''' is required for this. 

To do this, click on the '''Distillation column'''. 
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|| 08:58
|| Under '''Column Specs''', click on '''Condenser''' tab.
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||09:02
|| Under '''Compound''', we see a value of '''2.382'''

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|| 09:07
|| It is the same as what we obtained in the '''Sensitivity Analysis.''' 
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||09:13
|| Let me save this '''simulation''' as '''adjust.''' 
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|| 09:20
|| Let's summarize. 
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|| 09:22
|| In this tutorial, we have learnt to:

Determine the exact '''Reflux Ratio''' for a separation 
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|| 09:29
||  Performed '''Sensitivity Analysis''' and '''Adjust''' operation

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|| 09:33
|| I have some assignments for you. 
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|| 09:36
|| Simulate this problem statement using a Distillation column.

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|| 09:40
|| Here we give different Compounds, feed conditions and Thermodynamics. 
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|| 09:46
|| Different Column Configuration
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|| 09:49
|| Let us go to the next assignment.

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|| 09:52
|| Perform sensitivity analysis on the simulated distillation column.

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|| 09:57
|| To find the reflux ratio such that mole fraction of water in bottoms is 0.99

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|| 10:05
|| Using Adjust/Controller Block, verify the results obtained using the analysis.
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|| 10:12
|| Watch the video available at the following link. 

It summarizes the Spoken Tutorial project. 
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|| 10:19
|| The Spoken Tutorial Project Team conducts workshops and gives certificates. 

For more details, please write to us. 
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||10:29
|| Please post your timed queries in this forum.
|-
|| 10:33
|| The '''FOSSEE''' team coordinates conversion of existing '''flowsheets''' into '''DWSIM'''. 

|-
|| 10:39
|| We give honorarium and certificates for those who do this. 

For more details, please visit this site. 
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||10:48
|| The '''FOSSEE''' team helps migrate commercial simulator labs to '''DWSIM.''' 

|-
|| 10:55
|| We give honorarium and certificates for those who do this. 

For more details, please visit this site 
|-
|| 11:04
|| '''Spoken Tutorial''' and '''FOSSEE''' projects are funded by '''NMEICT''', ''' MHRD''', Government of India. 
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||11:13
|| We thank the '''DWSIM''' team for making it as an open source software.

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|| 11:20
|| This tutorial was originally recorded by Prof Kannan Moudgalya in September 2015.

This is Kaushik Datta from IIT Bombay.  Thanks for joining. 
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