View source for DWSIM-3.4/C2/Sensitivity-Analysis-and-Adjust/English-timed

{| Border=1
| <center>'''Time'''</center>
| <center>'''Narration'''</center>

|-
| 00:00
| Welcome to this '''spoken tutorial''' on '''DWSIM'''.

|-
| 00:04
|In this tutorial, we will learn how to do '''sensitivity analysis''' and '''adjust'''.

|-
| 00:10
|My name is Kannan Moudgalya.

|-
| 00:12
|  In this tutorial, We will determine the exact '''Reflux Ratio''' for a '''separation.'''
|-
| 00:19
|We will first do this through '''Sensitivity Analysis'''.

|-
| 00:24
|We will repeat this through the '''Adjust''' operation.

|-
| 00:28
| To record this tutorial, I am using '''DWSIM 3.4'''.

|-
| 00:34
| To practice this tutorial, you should know:
How to open a '''simulation file''' in '''DWSIM''' 
How to carry out '''rigorous distillation simulation'''. 
How to add components to a '''flowsheet'''.

|-
| 00:48
|Our website- '''spoken tutorial dot org''' gives details of the prerequisite tutorials.

|-
| 00:55
|You can access these tutorials and also all the associated files from this site.

|-
| 01:02
| This '''slide''' shows the problem solved in one of the prerequisite tutorials.

|-
| 01:08
|This was solved using '''Rigorous distillation'''.

|-
| 01:12
|The purity achieved was less than what was desired.

|-
| 01:17
|How do we improve the purity?

|-
| 01:19
|We need to increase the '''reflux ratio'''.

|-
| 01:23
|Let us open the corresponding file in '''DWSIM'''. 

|-
| 01:28
| The file name is in the heading.

|-
| 01:30
| I have already opened '''DWSIM'''.

|-
| 01:34
|I have already opened the file '''rigorous dot dwxml'''.

|-
| 01:40
|This file is available to you for download from our website '''spoken-tutorial.org'''.

|-
| 01:48
|Let us click '''Distillate.'''

|-
| 01:50
|In the '''Properties '''section, let us locate '''Molar Composition, '''item 2.

|-
| 02:00
|Let us click the arrow next to '''Mixture.'''

|-
| 02:04
| The '''Benzene mole fraction''' is 0.945.

|-
| 02:09
|We would like to increase this to 0.95.

|-
| 02:13
|Let us attempt this by increasing the '''reflux ratio'''. 

|-
| 02:18
|This is what we saw in the slide, a little while ago.

|-
|02:22 
|Locate the '''Optimization '''option from the '''Menu''' bar, to the right of the '''File '''button.

|-
| 02:28
|Let me click it.

|-
| 02:29
|Let me click the option '''Sensitivity Analysis.''' A window appears.

|-
| 02:37
|We can see five menus in the menu bar of '''sensitivity analysis'''.

|-
| 02:43
|Locate '''Sensitivity Studies.'''

|-
| 02:47
|If it is not already selected, click it.

|-
| 02:51
| Now we can see a box with four options under the title '''Case Manager.'''

|-
| 02:58
|Click on '''New '''option.

|-
| 03:01
|This will help in creating a new '''Sensitivity Analysis''' case.

|-
| 03:07
|We see the name '''SACase0.'''

|-
| 03:12
| Recall the problem that we want to solve:

|-
| 03:14
|We want to increase the '''reflux ratio''' so as to get better purity.

|-
| 03:19
|Thus, '''reflux ratio''' is the '''independent variable.'''

|-
| 03:24
| Let us enforce this through the '''Independent Variables '''button.

|-
| 03:29
|Let me click on empty space besides the '''Object '''button.

|-
| 03:34
|Click on '''DC-000''', the name of our '''distillation column'''.

|-
| 03:40
| On the right hand side, there is an option called '''Property.'''

|-
| 03:45
|Let me bring this inside.

|-
| 03:47
|Let me click the down-arrow.

|-
| 03:50
|Let me scroll down and identify '''Condenser_Specification_Value.'''

|-
| 03:55
|It comes at the bottom of this menu.

|-
| 03:57
|It plays the role of '''reflux ratio'''.

|-
| 03:59
|Click and select it.

|-
| 04:03
|You can see it here, selected.

|-
| 04:07
| Recall that we want our '''reflux ratio''' to be greater than 2.

|-
| 04:12
|So, we will enter the '''Lower limit''' as 2.

|-
| 04:16
|Change the '''Upper limit''' to 2.5.

|-
| 04:20
|Change the '''Number of Points''' to 6.

|-
| 04:24
| Let us next click on '''Dependent Variable.'''

|-
| 04:27
|On the left hand side, see a '''column''' called '''Variables.'''

|-
| 04:33
|Below that, see a plus button in green to '''Add '''variables. Click it.

|-
| 04:41
| A new row appears. Click the down-arrow below the '''Object.'''

|-
| 04:46
|You may have to click it twice.

|-
| 04:48
|Click on the option named '''Distillate.'''

|-
| 04:52
|Let me click the down-arrow below '''Property.'''

|-
| 04:56
|You may have to click this also twice, to open a drop-down menu.

|-
| 05:01
|Locate '''Molar Fraction (Mixture) – Benzene.'''

|-
| 05:05
|You will have to scroll down to reach it.

|-
| 05:08
|There are also other options that sound very similar to it.

|-
| 05:12
|Make sure that you choose this. Click it.

|-
| 05:17
|It gets selected and appears on the tab.  Then click on '''Results.'''

|-
| 05:24
|We can see the option called '''Start Sensitivity Analysis.'''. Let me click it.

|-
|05:31
| We see the column getting simulated for '''reflux ratios''', one by one.

|-
| 05:36
|At the end of the simulation, we get the message '''Done.'''

|-
| 05:40
| You see results for six '''reflux ratios''', from 2 to 2.5.

|-
| 05:49
|We also see the corresponding '''benzene''' compositions.

|-
| 05:54
| We can go back to '''Independent Variables.'''

|-
| 05:58
|Change the number of points to 11. Return to '''Results'''.

|-
| 06:05
|Click '''Start Sensitivity Analysis''' once again.

|-
| 06:10
|You can see that eleven runs get completed.

|-
| 06:14
| Let us scroll up.

|-
| 06:17
|See that the desired purity of 0.95 will be achieved between 2.05 and 2.1.

|-
| 06:26
|You may choose these as the '''lower''' and '''upper limits''' in '''Independent Variables''' and repeat.

|-
| 06:34
|But, I will not do that now.

|-
| 06:36
|Continuing in this manner, we can determine the exact '''reflux ratio''' required for 0.95 purity.

|-
| 06:45
| I have an assignment for you.

|-
| 06:46
|Can you find out the '''reflux ratio''' required for 0.95 purity?

|-
| 06:52
|Follow the procedure I explained just now.

|-
| 06:56
|I will give you the answer: It is approximately 2.067.

|-
| 07:01
| We can also see these results in a graphical form.

|-
| 07:07
|Click on '''Chart '''option.

|-
| 07:10
|Click on '''Draw '''option.  You can see the chart here.

|-
| 07:15
|'''Distillate composition''' versus '''condenser specification value''', that is, the '''reflux ratio'''.

|-
| 07:24
|Let me close this pop-up.

|-
| 07:26
|Let me '''save''' this simulation as "sensitivity".

|-
| 07:36
| Let us go to the next assignment.

|-
| 07:39
|In the previous assignment, include a second dependent variable: '''Benzene''' mole fraction in the '''bottoms'''.

|-
| 07:46
|Observe both distillate and bottoms compositions.

|-
| 07:51
|Find out how to plot two profiles using '''Chart.'''

|-
| 07:55
| Let us do another assignment.

|-
| 07:59
|Verify whether the reflux ratio of 2.067 that we saw in assignment 1 will work.

|-
| 08:06
|For this, start with '''rigorous.dwxml''' once again.

|-
| 08:11
|Change the reflux ratio to 2.067.

|-
| 08:15
|Simulate.

|-
| 08:17
|What distillate composition do you get?

|-
| 08:20
| We calculated the desired reflux ratio by trial and error.

|-
| 08:27
|'''DWSIM''' has a powerful method to directly calculate this.

|-
| 08:32
|It is called '''Adjust.'''

|-
| 08:35
|Let us locate '''Adjust '''from the '''object palette''' on the right hand side.

|-
| 08:42
|Drag it to flowsheet and drop it outside the column, below the '''distillate'''.

|-
| 08:49
|Let me click and choose it.

|-
| 08:52
| In the '''Properties''' tab, we see an option called '''Controlled variable.'''

|-
| 08:58
|This corresponds to the dependent variable, namely, '''distillate composition'''.

|-
| 09:05
|If it is not already opened, click the arrow to the left of the '''Controlled Variable''' and, this will open up.

|-
| 09:13
|Click where it says '''Click to Select.'''

|-
| 09:17
|Click the button that comes at the right end.

|-
| 09:19
| A pop-up appears.

|-
| 09:20
|It has three '''columns'''.

|-
| 09:23
|Below '''Type,''' click on '''Material Stream, '''if it is not already selected.

|-
| 09:29
|In the '''Object''' column, that is, in the middle column, choose '''Distillate.'''

|-
| 09:35
|This produces a lot of variables on the right most column.

|-
| 09:39
|Locate '''Molar Fraction (Mixture) – Benzene '''.

|-
| 09:44
|It comes after '''Solid Phase''' entries are over. Click it.

|-
| 09:51
|Once again, be careful, as there are many similar sounding options.

|-
| 09:55
|Click '''OK.'''

|-
| 09:58
|Verify that this gets reflected in the '''Properties''' menu.

|-
| 10:04
| Repeat the above process; but now, with '''Manipulated Variable.'''

|-
| 10:09
|Click the button on the right.

|-
| 10:12
|In the pop up, scroll down and locate '''Distillation column.''' Click on it.

|-
| 10:18
|Then click '''DC-000.''' Then locate '''Condenser_Specification_Value.'''

|-
| 10:26
|Click it and then '''OK.'''

|-
| 10:31
| Follow the usual procedure, now for '''Parameters''' property.

|-
| 10:36
|Scroll down to see this.

|-
| 10:40
|We can see an option called '''Adjust Property Value.'''

|-
|10:43
|This value is generally 1.

|-
| 10:48
|Delete 1 and enter 0.95.

|-
| 10:52
|I shall enter a slightly larger number 0.95001.

|-
| 11:00
|I want you to think about why I have entered a slightly larger number.

|-
| 11:06
|A few lines below this, see an option called '''Simultaneous Adjust.'''

|-
| 11:11
|Following the usual way, change its value to '''True.'''

|-
|11:18
| If it does not automatically calculate, press '''Play''' and then '''Recalculate All'''.

|-
| 11:26
|In my case, it calculated automatically. So, I shall not click those.

|-
| 11:32
|In a short time, calculations get completed.

|-
| 11:35
| Let us check whether our objective of 0.95 for distillate purity is achieved.

|-
|11:42
|Choose '''Distillate.'''

|-
| 11:44
|Check '''Mixture '''under '''Molar Composition.'''

|-
| 11:49
|We can see that '''benzene''' '''composition''' is 0.95.

|-
| 11:53
| Let us now check what '''reflux ratio''' is required for this.

|-
| 11:59
|For this, click on the '''Distillation column'''.

|-
| 12:02
|Check the value under '''Condenser Specification.'''

|-
| 12:08
|We see a value of 2.067.

|-
| 12:13
|It is the same as what we obtained in the '''Sensitivity Analysis.'''

|-
| 12:18
|Let me '''save''' this simulation as "adjust".

|-
| 12:27
| I have the next assignment for you.

|-
| 12:29
|Supposing that I want 0.96 benzene mole fraction in the distillate.

|-
| 12:36
|What reflux ratio is required?

|-
| 12:39
|As in the problems we solved, you may change only the reflux ratio.

|-
|12:44
|Solve this first by '''Sensitivity Analysis.'''

|-
| 12:47
|Check your calculations with '''Adjust.'''

|-
| 12:51
| Let us do one more assignment.

|-
| 12:52
|Find the highest distillate purity you can get in this column.

|-
| 12:58
|You may vary the reflux ratio only, as in the earlier assignments.

|-
| 13:03
|I could go up to a mole fraction of 0.99, by proceeding gradually.

|-
| 13:10
| Let me summarize.

|-
| 13:12
| We learnt the following in this tutorial:

|-
| 13:14
| how to do '''Sensitivity Analysis'''

|-
| 13:16
| how to narrow the solution range

|-
| 13:18
| how to directly achieve the same results using '''Adjust'''

|-
| 13:22
| how to use '''Adjust''' to push a plant to deliver more.

|-
| 13:27
| We have come to the end of this tutorial.

|-
| 13:31
| This video summarizes the '''Spoken Tutorial''' project.

|-
| 13:35
|If you do not have good bandwidth, you can download and watch it.

|-
| 13:39
| We conduct workshops using '''Spoken Tutorials'''; give certificates. Please contact us.

|-
| 13:47
| Do you have questions in THIS '''Spoken Tutorial?'''

|-
| 13:51
|Choose the '''minute''' and '''second''' where you have the question.

|-
| 13:54
|Explain your question briefly.

|-
| 13:56
|Someone from the '''FOSSEE''' team will answer them.

|-
| 13:59
|Please visit this site.

|-
| 14:02
| The '''FOSSEE''' team coordinates coding of solved examples of popular books.

|-
| 14:08
|We give honorarium and certificates for those who do this.

|-
| 14:12
|For more details, please visit this site.

|-
| 14:16
| The '''FOSSEE''' team helps migrate commercial simulator labs to '''DWSIM.'''

|-
| 14:21
|We give honorarium and certificates for those who do this.

|-
| 14:25
|For more details, please visit this site.

|-
| 14:28
| '''Spoken Tutorial''' and '''FOSSEE''' projects are funded by NMEICT, MHRD, Government of India.

|-
| 14:36
| Thanks for joining.

|}