DWSIM/C2/Heat-Exchanger/English-timed
From Script | Spoken-Tutorial
| Time | Narration |
| 00:01 | Welcome to this tutorial on simulating a Heat Exchanger in DWSIM. |
| 00:07 | In this tutorial, we will learn to: simulate a Heat Exchanger, |
| 00:13 | calculate the Outlet stream temperatures, |
| 00:16 | calculate Thermal Efficiency and LMTD. |
| 00:20 | To record this tutorial, I am using DWSIM 4.3 and Windows 7. |
| 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 how to add components to a flowsheet, |
| 00:47 | select thermodynamic packages, |
| 00:50 | add material stream and specify their properties. |
| 00:54 | The prerequisite tutorials are mentioned on our website. |
| 00:58 | You can access these tutorials and all the associated files from this site. |
| 01:04 | We will develop a flowsheet to determine the Outlet stream temperatures. |
| 01:09 | Here, we give Compounds and Inlet stream conditions. |
| 01:13 | Here, we give Heat Exchanger properties and Property package. |
| 01:18 | I have already opened DWSIM on my machine. |
| 01:23 | Go to File menu and select New Steady-state Simulation. |
| 01:28 | Simulation Configuration Wizard window appears. |
| 01:32 | At the bottom, click on Next button. |
| 01:36 | Now, in the Compounds Search tab, type Methanol. |
| 01:42 | Select Methanol from ChemSep database. |
| 01:46 | Similarly, add Water. |
| 01:49 | At the bottom, click on Next button. |
| 01:53 | Now comes Property Packages. |
| 01:56 | From Available Property Packages, double-click on Raoult’s Law. |
| 02:01 | Then click on Next button. |
| 02:04 | We are moved to a new window named Flash Algorithm. |
| 02:08 | From Default Flash Algorithm, select Nested Loops(VLE). |
| 02:14 | Click on Next button. |
| 02:17 | Next option is System of Units. |
| 02:21 | Under System of Units, select C5. |
| 02:26 | At the bottom, click on Finish button. |
| 02:30 | Let us maximize the simulation window for better visibility. |
| 02:35 | Now, let’s insert two material stream that enter the Heat Exchanger. |
| 02:41 | On the right hand side of the main simulation window, go to Flowsheet Objects. |
| 02:47 | In the Filter List tab, type Material Stream. |
| 02:52 | From the displayed list, drag and drop a Material Stream to the Flowsheet. |
| 02:58 | Click on the Material Stream “MSTR-000” to view its properties. |
| 03:04 | Let’s change the name of this stream to Water In. |
| 03:08 | Now we will specify the Water In stream properties. |
| 03:13 | Go to Input Data. |
| 03:15 | Select Flash Spec as Temperature and Pressure (TP), if not already selected. |
| 03:21 | By default, Temperature and Pressure are already selected as Flash Spec. |
| 03:27 | Change Temperature to 10 degC and press Enter. |
| 03:32 | Change Pressure to 1 bar and press Enter. |
| 03:37 | Change Mass Flow to 15000 kg per hour and press Enter. |
| 03:44 | Now, let us specify the feed stream compositions. |
| 03:49 | Under Composition, choose the Basis as Mole Fractions, if not already selected. |
| 03:56 | By default, Mole Fractions is selected as Basis. |
| 04:01 | Now for Methanol, enter the Amount as 0 and press Enter. |
| 04:08 | Similarly, for Water, enter it as 1 and press Enter. |
| 04:15 | On the right, click on this green tick to Accept Changes. |
| 04:20 | Now drag and drop another Material Stream to the flowsheet. |
| 04:25 | Click on Material Stream “MSTR-001” to view its properties. |
| 04:30 | Let’s change the name of this stream to Methanol In. |
| 04:35 | Now we will specify the Methanol In stream properties. |
| 04:40 | Go to Input Data. |
| 04:42 | Select Flash Spec as Temperature and Pressure(TP). |
| 04:46 | By default, Temperature and Pressure are again already selected as Flash Spec. |
| 04:42 | Change Temperature to 80 degC and press Enter. |
| 04:58 | Change Pressure to 5 bar and press Enter. |
| 05:03 | Change Mass Flow to 25000 kg/h and press Enter. |
| 05:11 | Now, let us specify the Methanol In stream compositions. |
| 05:17 | Under Composition, choose the Basis as Mole Fractions, if not already selected.
By default, Mole Fractions is selected as Basis. |
| 05:29 | Now for Methanol, enter the Amount as 1 and press Enter. |
| 05:36 | Similarly, for Water, enter it as 0 and press Enter. |
| 05:43 | On the right, click on this green tick to Accept Changes. |
| 05:48 | Now, let’s insert two more material streams that exit the Heat Exchanger. |
| 05:54 | To do that, let us drag one Material Stream. |
| 05:58 | Let us now arrange it. |
| 06:00 | Leave that stream as unspecified. |
| 06:03 | We will change the name of this stream to Water Out. |
| 06:07 | Next, we will insert another Material Stream. |
| 06:11 | Let us once again arrange it. |
| 06:14 | Leave that stream as unspecified. |
| 06:18 | And name this stream as Methanol Out. |
| 06:22 | Now, let us insert a Heat Exchanger into the flowsheet. |
| 06:27 | Go to the Flowsheet Objects. |
| 06:30 | In the Filter list tab, type Heat Exchanger. |
| 06:35 | Click on the Heat Exchanger displayed. |
| 06:39 | Drag and drop it to the flowsheet. |
| 06:42 | Let us now arrange it as required for better visibility. |
| 06:47 | We are now ready to specify the Heat Exchanger. Let's click on it. |
| 06:53 | On the left, we can see a tab called Property Editor Window. |
| 06:58 | Under Connections, click on the drop-down against Inlet Stream 1.
And select Methanol In. |
| 07:07 | Next, click on drop-down against Outlet Stream 1 and select Methanol Out. |
| 07:14 | Then click on drop-down against Inlet Stream 2 and select Water In. |
| 07:21 | Then click on drop-down against Outlet Stream 2 and select Water Out. |
| 07:28 | Now go to the next section- Calculation Parameters. |
| 07:32 | Here, the first option is Calculation Type. |
| 07:36 | Click on the drop-down against Calculation Type. |
| 07:39 | Select Outlet Temperatures. |
| 07:43 | Next, click on the drop-down against Flow Direction. Select Counter Current. |
| 07:51 | Then click on the field against Cold Fluid Pressure Drop and enter 0.002 bar.
Then press Enter. |
| 08:03 | Click on the field against Hot Fluid Pressure Drop and enter it as 0.025 bar. |
| 08:11 | Then press Enter. |
| 08:15 | Click on the field against Overall Heat Transfer Coefficient and enter it as 450 Watt meter square Kelvin.
Then press Enter. |
| 08:27 | Click on the field against Heat Exchange Area and enter it as 250 meter square.
Then press Enter. |
| 08:37 | Now we will run the simulation. |
| 08:40 | So, from the toolbar, click on Solve Flowsheet button. |
| 08:45 | When the calculations are completed, click on Heat Exchanger in the Flowsheet. |
| 08:50 | From the Property Editor Window of Heat Exchanger, locate Results section. |
| 08:56 | Check Thermal efficiency; it is 94.5%. Check Log Mean Temperature Difference; it is 10.29 degree Centigrade. |
| 09:09 | Now we will check the stream-wise temperature results and Material balance. |
| 09:15 | Go to Insert menu and select Master Property Table. |
| 09:20 | Double-click on Master Property Table to edit it. |
| 09:24 | Configure Master Property Table window opens. |
| 09:28 | Enter Name as Heat Exchanger – Stream Wise Results. |
| 09:33 | Enter Object Type as Material Stream. By default, Material Stream is already selected. |
| 09:40 | So, we will not change it. |
| 09:43 | Under Properties to display, select Object as: Water In, Methanol In, Water Out, Methanol Out. |
| 09:54 | Under Property, scroll-down to see all the parameters. |
| 10:00 | Now select the properties as:
Temperature, Pressure, Mass Flow, Molar Flow, |
| 10:11 | Molar Fraction(Mixture) / Methanol, |
| 10:15 | Molar Fraction(Mixture) / Water. |
| 10:19 | Close this window. |
| 10:22 | Move the Master Property Table for better visibility. |
| 10:27 | Here, we can see the corresponding results for Inlet and Outlet streams. |
| 10:33 | Now we will check the properties of Heat Exchanger. |
| 10:37 | Go to Insert menu and select Master Property Table. |
| 10:42 | Double-click on Master Property Table. |
| 10:46 | Configure Master Property Table window opens. |
| 10:50 | Enter Name as Heat Exchanger – Results. |
| 10:55 | Enter Object Type as Heat Exchanger. |
| 10:59 | Under Properties to display, select Object as HE-004. |
| 11:06 | Under Property, scroll down to see all the parameters. |
| 11:12 | Now, select the properties as: Global Heat Transfer Coefficient (U), |
| 11:17 | Heat Exchange Area (A),
Heat Load, |
| 11:21 | Cold fluid outlet temperature,
Hot fluid outlet temperature, |
| 11:26 | Logarithmic mean temperature difference(LMTD) and
Thermal Efficiency. |
| 11:32 | Close this window. |
| 11:35 | Move the Master Property Table for better visibility. |
| 11:39 | Here we can see the corresponding results for Heat Exchanger. |
| 11:43 | Let's summarize. |
| 11:45 | In this tutorial, we have learnt to: simulate a Heat Exchanger, |
| 11:50 | calculate the Outlet stream temperatures, |
| 11:53 | calculate Thermal Efficiency and LMTD. |
| 11:57 | As an assignment, repeat this simulation with different Compounds, feed conditions and Thermodynamics. |
| 12:05 | Watch the video available at following link. |
| 12:08 | It summarizes the Spoken Tutorial project. |
| 12:12 | The Spoken Tutorial Project Team conducts workshops and gives certificates.
For more details, please write to us. |
| 12:20 | Please post your times queries in this forum. |
| 12:24 | The FOSSEE team coordinates conversion of existing flow sheets into DWSIM. |
| 12:29 | We give honorarium and certificates. For more details, please visit this site. |
| 12:36 | The FOSSEE team coordinates coding of solved examples of popular books. |
| 12:41 | We give honorarium and certificates. For more details, please visit this site. |
| 12:48 | The FOSSEE team helps migrate commercial simulator labs to DWSIM. |
| 12:54 | We give honorarium and certificates. For more details, please visit this site. |
| 13:00 | Spoken Tutorial and FOSSEE projects are funded by NMEICT, MHRD, Government of India. |
| 13:09 | This tutorial is contributed by Kaushik Datta and Priyam Nayak.
Thanks for joining. |
