DWSIM/C2/Heat-Exchanger/English-timed

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 sqaure 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.
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12:24	The FOSSEE team coordinates conversion of existing flow sheets into DWSIM.
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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.

Contributors and Content Editors

PoojaMoolya, Sandhya.np14