DWSIM/C2/Calculation-of-Bubble-Points-and-Dew-Points/English-timed
From Script | Spoken-Tutorial
| Time | Narration |
| 00:01 | Welcome to this tutorial on Calculation of Bubble Points and Dew Points in DWSIM. |
| 00:07 | In this tutorial, we will learn to generate: Bubble Point Temperature at a given pressure, |
| 00:15 | Dew Point Temperature at a given pressure. |
| 00:19 | To record this tutorial, I am using DWSIM 5.2 (Classic UI) and Windows 10. |
| 00:28 | The process demonstrated in this tutorial is identical in other OS also such as-
Linux, Mac OS X or FOSSEE OS on ARM. |
| 00:40 | To practice this tutorial, you should know to: add components to a flowsheet, |
| 00:46 | select thermodynamic packages and add material stream and specify their properties. |
| 00:54 | The prerequisite tutorials are mentioned on our website spoken-tutorial.org |
| 00:59 | You can access these tutorials and all the associated files from this site. |
| 01:05 | In this tutorial, using DWSIM, we will calculate:
1) Bubble Point Temperature at 2 bar 2) Dew Point Temperature at 10 bar |
| 01:15 | Here we provide the compounds, inlet stream conditions and property package. |
| 01:21 | I have already opened DWSIM on my machine. |
| 01:26 | Go to File menu and select New Steady-state Simulation. |
| 01:33 | Simulation Configuration Wizard window appears. |
| 01:37 | At the bottom, click on the Next button. |
| 01:41 | Now, in the Compounds Search tab, type: Methane. |
| 01:46 | Select Methane from ChemSep database. |
| 01:50 | Next, we will add Ethane. |
| 01:54 | Similarly, add Propane. |
| 01:58 | Next, add Isobutane. |
| 02:02 | Followed by N-butane. |
| 02:06 | Similarly, add Isopentane. |
| 02:10 | Then add N-pentane. |
| 02:14 | At the bottom of the window, click on the Next button. |
| 02:18 | The Property Packages opens. |
| 02:21 | From Available Property Package list, double-click on Soave-Redlich-Kwong. |
| 02:28 | Then click on the Next button. |
| 02:31 | We are moved to a new window named Flash Algorithm. |
| 02:36 | From Default Flash Algorithm, select Nested Loops(VLE). |
| 02:41 | Click on the Next button at the bottom. |
| 02:44 | The next option is System of Units. |
| 02:48 | Under System of Units, select C5. |
| 02:52 | At the bottom, click on the Finish button. |
| 02:55 | Let us maximize the simulation window for better visibility. |
| 03:00 | Now let’s insert a material stream for which we have to calculate Bubble points and Dew points. |
| 03:07 | On the right hand side of the main simulation window, go to Flowsheet Objects. |
| 03:12 | In the Filter List tab, type: Material Stream. |
| 03:17 | From the displayed list, drag and drop a Material Stream to the Flowsheet. |
| 03:23 | Click on the Material Stream “MSTR-000” to view its properties. |
| 03:29 | Let’s change the name of this stream to Feed. |
| 03:33 | Now we will specify the Feed stream properties. |
| 03:37 | Go to the Input Data. |
| 03:39 | Select Flash Spec as Temperature and Pressure (TP), if not already selected. |
| 03:44 | By default, Temperature and Pressure are already selected as Flash Spec. |
| 03:50 | Change Temperature to 25 degree Celsius and press Enter. |
| 03:56 | Change Pressure to 5 bar and press Enter. |
| 04:00 | Now, let us specify the feed stream compositions. |
| 04:05 | Under Composition, choose the Basis as Mole Fractions, if not already selected. |
| 04:13 | By default, Mole Fractions is selected as Basis. |
| 04:18 | Now, for Methane, type the Amount as 0.05 and press Enter. |
| 04:26 | For Ethane, type it as 0.1 and press Enter. |
| 04:33 | Similarly, for Propane, type 0.15 and press Enter. |
| 04:39 | And for Isobutane, type 0.1 and press Enter. |
| 04:45 | Next, for N-butane, type 0.2 and press Enter. |
| 04:51 | For Isopentane, type 0.25 and press Enter. |
| 04:57 | Lastly, for N-pentane, type 0.15 and press Enter. |
| 05:04 | On the right, click on this green tick to Accept Changes. |
| 05:08 | Now we will see how property package calculates phase equilibrium data of compounds. |
| 05:14 | To do this, go to Utilities. |
| 05:17 | Click on Add Utility. |
| 05:20 | In the Add Utility window, under Object Type, select Material Streams. |
| 05:27 | Under Utility Type, select Phase Envelope. |
| 05:31 | Under Flowsheet Object, select Feed. |
| 05:35 | Then, at the bottom, click on the Add Utility button. |
| 05:40 | Phase Envelope window opens. |
| 05:43 | Let us adjust the Phase Envelope window for better visibility. |
| 05:49 | Enter Name as BubblePoint-DewPoint. |
| 05:55 | Under Settings, click on Bubble Points tab. |
| 06:00 | Select the check box against Custom Initialization. |
| 06:05 | We are going to calculate bubble point temperature against given pressure. |
| 06:10 | So, let Initial Flash method be PVF. |
| 06:14 | Here, we will change only Initial Pressure and Pressure Step. |
| 06:19 | Type Initial Pressure as 1 bar and press Enter. |
| 06:24 | Type Pressure Step as 1 bar and press Enter. |
| 06:30 | We will not change any temperature value as we are doing a PVF Flash. |
| 06:36 | Now, go to Dew Points tab. |
| 06:39 | We will repeat the same process as Bubble Points Initialization. |
| 06:44 | Select the check box against Custom Initialization. |
| 06:49 | We are going to calculate dew point temperature against given pressure. |
| 06:54 | So, here also let the Initial Flash method be PVF. |
| 06:59 | Hence we will change only Initial Pressure and Pressure Step |
| 07:04 | Type Initial Pressure as 1 bar and press Enter. |
| 07:10 | Type Pressure Step as 1 bar and press Enter. |
| 07:16 | Now click on the Calculate button at the bottom. |
| 07:20 | The calculation process is running in the background. |
| 07:25 | We can see the dew points and bubble points generated at different pressure and temperatures. |
| 07:32 | Under Results, click on Table. |
| 07:36 | In the column Pb, look for 2 bar at which we had to calculate the bubble point.
Here is 2 bar under Pb column. |
| 07:45 | Look for temperature in Tb column corresponding to 2 bar. |
| 07:50 | We can see the bubble point temperature to be minus 91.9274 degree Celcius |
| 07:58 | Next, we have to find Dew point temperature at 10 bar. |
| 08:03 | In the column Pd, look for 10 bar at which we have to find the dew point. |
| 08:09 | Here is 10 bar under Pd column. |
| 08:12 | Look for temperature in Td column corresponding to 10 bar. |
| 08:17 | We can see the dew point temperature to be 87.396 degree Celcius. |
| 08:24 | There is an alternative way by which we can verify the correctness of the above results. |
| 08:30 | For this, let’s get back to flowsheet window. |
| 08:34 | Click on Feed. |
| 08:37 | Under Input data, select Flash Spec as Pressure and Vapor Fraction (PVF). |
| 08:44 | Type Vapor Phase Mole Fraction as 0 and press Enter. |
| 08:50 | And, Pressure as 2 bar and press Enter. |
| 08:56 | Now check the temperature which is minus 91.9274 degree C. |
| 09:03 | This is the bubble point temperature at 2 bar pressure. |
| 09:07 | It matches the value obtained earlier from Phase envelope. |
| 09:11 | Similarly, let’s check for Dew point temperature. |
| 09:16 | Let the Flash Spec be same as Pressure and Vapor Fraction (PVF). |
| 09:21 | Type Vapor Phase Mole Fraction as 1 and press Enter. |
| 09:27 | And Pressure as 10 bar and press Enter. |
| 09:32 | Now, check the temperature which is 87.396 degree C. |
| 09:38 | This is the dew point temperature at 10 bar pressure. |
| 09:42 | It matches the value obtained earlier from Phase envelope. |
| 09:46 | Let's summarize. |
| 09:48 | In this tutorial, we have learnt to generate: Bubble Point Temperature at a given pressure, |
| 09:54 | Dew Point Temperature at a given pressure. |
| 09:57 | As an assignment, calculate the following for the given component system and inlet conditions. |
| 10:04 | Calculate Bubble Point Pressure at 20 degree Celsius. |
| 10:08 | Calculate Dew Point Pressure at 60 degree Celsius. |
| 10:12 | Watch the video available at 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. |
| 10:26 | Please post your times queries in this forum. |
| 10:31 | The FOSSEE team coordinates conversion of existing flow sheets into DWSIM. |
| 10:37 | We give honorarium and certificates. |
| 10:40 | For more details, please visit this site. |
| 10:43 | The FOSSEE team coordinates coding of solved examples of popular books. |
| 10:48 | We give honorarium and certificates. For more details, please visit this site. |
| 10:55 | The FOSSEE team helps migrate commercial simulator labs to DWSIM. |
| 11:01 | We give honorarium and certificates. For more details, please visit this site |
| 11:08 | Spoken Tutorial and FOSSEE projects are funded by NMEICT, MHRD, Government of India. |
| 11:16 | This tutorial is contributed by Kaushik Datta and Priyam Nayak.
Thanks for joining. |
