PoojaMoolya: Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- || 00:01 || Welcome to this tutorial on '''Sensitivity Analysis''' and '''Adjust''' in '''DWSIM.''' |- || 00:08 || In this tutor..."

2021-04-30T10:27:41Z

Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- || 00:01 || Welcome to this tutorial on '''Sensitivity Analysis''' and '''Adjust''' in '''DWSIM.''' |- || 00:08 || In this tutor..."

New page

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

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

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

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

|-
|| 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'''
|-
||00:51
|| The prerequisite tutorials are available on this website.

|-
|| 00:55
|| You can access these tutorials and all the associated files from this site.
|-
|| 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.
|-
|| 01:13
|| This slide shows the problem solved using '''Rigorous Distillation'''.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

It is called '''Adjust.'''

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

For more details, please write to us.
|-
||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.
|-
||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.
|-
||11:13
|| We thank the '''DWSIM''' team for making it as an open source software.

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

This is Kaushik Datta from IIT Bombay. Thanks for joining.
|-
|}

DWSIM/C2/Sensitivity-Analysis-and-Adjust/English-timed - Revision history

PoojaMoolya: Created page with "{|border=1 ||'''Time''' ||'''Narration''' |- || 00:01 || Welcome to this tutorial on '''Sensitivity Analysis''' and '''Adjust''' in '''DWSIM.''' |- || 00:08 || In this tutor..."