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Improve Fidelity of your Process Models by Sizing Rigorous Heat Exchanger Models Using Aspen Plus®
© 2015 Aspen Technology, Inc. All rights reserved. 2
Objective
This guide will demonstrate how you can increase the fidelity of your process model by using Rigorous Heat Exchanger models generated using the Heat Exchanger sizing feature in Aspen Plus.
We will cover the following types of heat exchanger units:
• Shell & Tube heat exchanger
• Air Cooled heat exchanger
For this exercise we use the Aspen Plus model titled: “Shell&Tube for InteractiveSizing.bkp”.
To download the required files for this exercise please visit Aspen Tech’s customer support site.(Refer to Knowledge Base Solution ID: 143031 at the following location http://support.aspentech.com/webteamasp/KB.asp?ID=143031 )
3 © 2014 Aspen Technology, Inc. All rights reserved.
Shell & Tube Exchanger
© 2015 Aspen Technology, Inc. All rights reserved. 4
Demonstration Workflow
Here is the order of tasks this guide will walk you through:
1. Open Aspen Plus Process Model
2. Locate the simple heat exchanger model
3. Convert the simple model to a rigorous heat exchanger model
4. Check the design for any risks or warnings
5. Review key design results (performance, spec. sheet, weight, length, etc.)
© 2015 Aspen Technology, Inc. All rights reserved. 5
Open the Process Model
Open ‘Shell & Tube for Interactive Sizing.bkp’
© 2015 Aspen Technology, Inc. All rights reserved. 6
Locate the Heat Exchanger
Note that Blue rings indicate rigorous models and Grey rings indicate simple models.
© 2015 Aspen Technology, Inc. All rights reserved. 7
Run Simulation
Click the ‘Run’ button to run the simulation.
© 2015 Aspen Technology, Inc. All rights reserved. 8
Convert to Rigorous Model
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Select the Exchanger Type
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Size the Heat Exchanger
Click on ‘Size’ to develop the rigorous heat exchanger model.
© 2015 Aspen Technology, Inc. All rights reserved. 11
Review the Design
Review the geometry of the
heat exchanger.
© 2015 Aspen Technology, Inc. All rights reserved. 12
Review the Design
Review the process conditions of the heat exchanger (e.g. Stream Pressure Drops,
etc.).
© 2015 Aspen Technology, Inc. All rights reserved. 13
Review the Design
Look for any warnings or errors.
In this case, since there are no operational warnings, we chose to accept the design.
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Open the EDR Browser
To review key design results, click on ‘EDR Browser’
© 2015 Aspen Technology, Inc. All rights reserved. 15
Check Performance
Click on ‘Check Performance’ to review overall performance results such as stream temperatures, pressure drops, any vibrational problems, etc.
© 2015 Aspen Technology, Inc. All rights reserved. 16
Review Spec Sheet
Click on ‘Review Spec Sheet’ to review TEMA sheet for details including lengths, weights, etc.
© 2015 Aspen Technology, Inc. All rights reserved. 17
Verify Geometry
Click on ‘Verify Geometry’ to review the Setting Plan and Tubesheet Layout.
© 2015 Aspen Technology, Inc. All rights reserved. 18
Review Profiles
Click on ‘Review Profile’ to check the
profiles for key parameters such as
stream temperatures,
pressures, vapor fraction, etc.
19 © 2014 Aspen Technology, Inc. All rights reserved.
Air Cooled Heat Exchanger
© 2015 Aspen Technology, Inc. All rights reserved. 20
Demonstration Workflow
Below is the order of tasks we will follow next:
1. Open Aspen Plus Process Model
2. Locate the simple heat exchanger model
3. Convert the simple model to a rigorous heat exchanger model
4. Check the design for any risks or warnings
5. Change the design to address any warnings
6. Review key design results (performance, spec. sheet, weight, length, etc.)
© 2015 Aspen Technology, Inc. All rights reserved. 21
Open the Process Model
Open ‘Shell & Tube for Interactive Sizing.bkp’
© 2015 Aspen Technology, Inc. All rights reserved. 22
Locate the Heat Exchanger
Note that Blue rings indicate rigorous models and Grey rings indicate
simple models
© 2015 Aspen Technology, Inc. All rights reserved. 23
Run Simulation
Click the ‘Run’ button to run the simulation.
© 2015 Aspen Technology, Inc. All rights reserved. 24
Convert to Rigorous Model
© 2015 Aspen Technology, Inc. All rights reserved. 25
Select the Exchanger Type
© 2015 Aspen Technology, Inc. All rights reserved. 26
Size the Heat Exchanger
Click on ‘Size’ to develop the rigorous heat exchanger model.
© 2015 Aspen Technology, Inc. All rights reserved. 27
Review the Design
Review the geometry of the heat exchanger.
© 2015 Aspen Technology, Inc. All rights reserved. 28
Review the Design
Review the process
conditions of the heat exchanger.
(e.g. Stream Pressure Drops,
etc.)
© 2015 Aspen Technology, Inc. All rights reserved. 29
Review the Design
In this case, note that there is an Operation Warning.
We will now try some changes to the design to address this issue. To make any changes, click ‘Accept Design’ and then open the ‘EDR Browser’.
© 2015 Aspen Technology, Inc. All rights reserved. 30
Open the EDR Browser
For making changes to the design, click on ‘EDR Browser’.
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Tweak the Design
We change the number of fans per bay to 9.
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Check the Design
Note that the new design does not generate any Operational Warnings, therefore we chose to go ahead with this design.
© 2015 Aspen Technology, Inc. All rights reserved. 33
Run Simulation
Click the ‘Run’ button to run the simulation.
© 2015 Aspen Technology, Inc. All rights reserved. 34
Check Performance
Click on ‘Check Performance’ to review overall performance
results, such as stream
temperatures, pressure drops,
etc.
© 2015 Aspen Technology, Inc. All rights reserved. 35
Review Spec Sheet
Click on ‘Review Spec Sheet’ to
review API sheet for details including
number of fans, power
consumption, weights, etc.
© 2015 Aspen Technology, Inc. All rights reserved. 36
Verify Geometry
Click on ‘Verify Geometry’ to review Setting Plan and Tube Layout.
© 2015 Aspen Technology, Inc. All rights reserved. 37
Review Profiles
Click on ‘Review Profile’ to check the
profiles for key parameters, such
as stream temperatures,
pressures, vapor fraction, etc.
© 2015 Aspen Technology, Inc. All rights reserved. 38
Additional Resources & Contacts
• AspenTech Support Website (http://support.aspentech.com)
• AspenTech Courseware Available in Classroom and Online Versions
• AspenTech Business Consultants
Contact Name Contact Email
Sandeep Mohan [email protected]
