Getting Started - Aspen Shell and Tube Exchanger

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© 2011Aspen Technology, Inc.AspenTech®, aspenONE®, theAspen leaflogo, OPTIMIZE,and the 7 BestPractices of EngineeringExcellenceare trademarksof AspenTechnology,Inc. All rights

reserved. All other trademarks are property of their respective owners. 11-439-0611

Getting Started — Aspen Shell & Tube Exchanger A Brief Tutorial (and supplement to training and online documentation)

By Tom Ralston, Product Manager; Steve Noe, Marketing Manager, Aspen Technology, Inc.



About AspenTech

AspenTech is a leading supplier of software that optimizes process manufacturing—for energy, chemicals,

pharmaceuticals, engineering and construction, and other industries that manufacture and produce

products from a chemical process. With integrated aspenONE® solutions, process manufacturers can

implement best practices for optimizing their engineering, manufacturing, and supply chain operations.As a result, AspenTech customers are better able to increase capacity, improve margins, reduce costs,

and become more energy efficient. To see how the world’s leading process manufacturers rely on

AspenTech to achieve their operational excellence goals, visit www.aspentech.com.



© 2011Aspen Technology, Inc.AspenTech®, aspenONE®, theAspen leaflogo, OPTIMIZE,and the 7 BestPractices of EngineeringExcellenceare trademarksof AspenTechnology,Inc. All rights


Getting Started — Aspen Shell & Tube Exchanger

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1. Business Background Aspen Shell & Tube Exchanger enables optimum design, rating or simulation of shell and tube, double pipe, or multi-tube

hairpin exchangers for both the expert and casual user. Integration with process simulators and other AspenTech

engineering tools allows for improved overall process optimization through better collaboration across engineering

disciplines.

Aspen Shell & Tube Exchanger addresses a wide range of application needs, serving both the engineering contractor and the

equipment fabricator, with the ability to share models from conceptual design to operational troubleshooting. It facilitates

the full range of practical process applications, including reflux condensers, kettle reboilers, thermosyphon reboilers,

falling film evaporators, and multi-shell, multi-pass feed-effluent trains. This flexibility allows the process streams to be

single phase, boiling or condensing vapors, single component or any mixture with or without non-condensable gases in

any condition (including superheated vapor, saturated vapor, or subcooled liquid).

2. Scope of this Document

This document serves as a simple “getting started” guide, taking you through the most common progression of how theequipment designer would use this standalone equipment design tool. This guide is not meant to be used as the only

reference source for documentation. We recommend that a range of other resources be called upon to give the new user a

comprehensive view of how to use this capability. This may include:

• Online documentation – which can be accessed through the Aspen Exchanger Design & Rating (EDR) software user

screens.

• AspenTech support website (support.aspentech.com), which contains a wide range of knowledge base items with

answers to frequently asked questions.

• AspenTech courseware available in classroom and on-line versions, which provide formal training on process modeling

and heat transfer technology.• AspenTech business consultants.

• Pre-recorded tutorials and webinars that provide another view of the information contained in this document. You will

be required to enter your AspenTech support id and password (go to the animated tutorial section on the following for

many of these resources: http://support.aspentech.com/webteamasp/My/product.asp?id1=3030&id2=

Aspen%20Shell%20%26%20Tube%20Exchanger&id3=all).

This document covers standalone use of the Aspen Exchanger Design & Rating program and assumes that the user has

Aspen EDR V7.0 or newer installed.

3. Problem OverviewWe have been challenged with designing a shell side condenser containing a mixture of steam and methanol and using

water as a coolant. Aspen Shell & Tube Exchanger provides the unique capability of automating the design process for

optimizing the sizing of the heat exchanger to lowest cost. The design calculation will determine the shell length and

diameter, the nozzle sizes, the number of tubes and passes, the number of baffles and baffle cut. Other details such as

shell and header type, baffle type, tube type and layout will use program defaults.

http://support.aspentech.com/

http://support.aspentech.com/webteamasp/My/product.asp?id1=3030&id2=Aspen%20Shell%20%26%20Tube%20Exchanger&id3=all





http://support.aspentech.com/



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© 2011Aspen Technology, Inc.AspenTech®, aspenONE®, theAspen leaflogo, OPTIMIZE,and the 7 BestPractices of EngineeringExcellenceare trademarks of AspenTechnology,Inc. All rights


The design logic will optimize the heat transfer against the allowable pressure drop on both the shell and tube sides. The

program has built in heuristic rules, which will stop searching once it realizes it has achieved the optimal calculation.

The process data details used for this example are shown in Table 1 below:

4. The Step-by-Step GuideLaunch Aspen Shell & Tube Exchanger from the Start button on the Windows Task bar. Select Shell & Tube Exchanger (Shell

& Tube) from the New tab and click OK (Figure 1).

Aspen Shell & Tube Exchanger will open to its navigator, which will be shown on the left-hand portion of the display. It

serves as a table of contents into the input, and once the program is run, the

output or results from the calculations. Categories marked with a red (X)

contain required information that must be completed in order for the

program to run (Figure 2).

Table 1. Process Data

Fluid Hot Side – Steam 40% Cooling Water Units

& Methanol 60%

Total Flow Rate 12.6 76 kg/s

Temperature (In / Out) 116 / 77 38 / 82 C

Inlet Pressure 1 6.5 bar (abs)

Allowable Pressure Drop 0.05 0.7 bar

Fouling Resistance 0.00018 0.00018 m2*K/W

Figure 1. Creating a New file

Figure 2. Aspen EDR User Interface






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You can proceed through the input data by either highlighting the individual fields from the navigator or use the

Next ( ) button. Either will automatically take you to the next sequential section that requires input data. Highlight

Application Options and set the Calculation Mode to Design and the Hot Side Fluid to the Shell Side. The user interface

uses the convention of displaying user supplied information in black text and program defaults with red text (Figure 3).

Use the Next ( ) button to navigate to the Process Data form where input data is required. Input fields with a white

background are optional, input fields with a blue background are required, and input fields with a red background are

believed to be out of a valid range. The program will run with input supplied with a red background, but it is up to the user

to determine if the data entered is correct. Specify the Process Data information from the process information previously

provided in the Problem Overview section in

Table 1. The red (X) will disappear from the

section when all required data in the section has

been entered (Figure 4).

Figure 3. Application Options

Figure 4. Process Data



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Use the Next ( ) button to navigate to the Hot Stream Compositions section under Property Data. Use the pull down

for the Physical Properties Package to select Aspen Properties (Figure 5).

Click Search Databank to build the component list that contains 60% by weight of methanol and 40% of water. Step 1 –

type in the component name, Step 2 – click Find Now, Step 3 – highlight the component, Step 4 – click Add selected

compounds. Repeat the same steps to add the second compound water. Click Close after water has been added

(Figure 6).

Figure 5. Hot Stream Compositions

Figure 6. Hot Stream – Find Compounds






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Specify the appropriate percentage composition for the two compounds (Figure 7).

Click on the Property Methods tab. Select NRTL from the pull down (Figure 8).

Figure 7. Hot Stream – Composition Percentage

Figure 8. Hot Stream – Property Method



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Click on Hot Stream Properties and use the Get Properties button to retrieve the properties from the Aspen Properties

package (Figure 9).

Click on Cold Stream Compositions. We are using cooling water for the coolant. Specify 100 for the composition for water

(Figure 10).



Figure 9. Hot Stream – Properties

Figure 10. Cold Stream – Composition






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Click on the Property Methods tab. Select STEAMNBS from the pull down to use the ASME steam tables for the

properties of water (Figure 11).

Click on Cold Stream Properties and use the Get Properties button to retrieve the properties from the Aspen Properties

package (Figure 12).

Save the case – All the required data has been entered, indicated by no red (Xs) remaining for any of the sections in the

navigator. It is important to save the dataset. From the menu click File, then Save As. Now you can run by clicking on the

Run button ( ) or from the menu, Run, Run Shell & Tube Exchanger.

Figure 11. Cold Stream – Property Method

Figure 12. Cold Stream Properties



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The heat exchanger selected by the program can be viewed in Results | Results Summary | Optimization Path. Aspen Shell

& Tube Exchanger will vary the shell size, tube length, number of tube passes, the baffle spacing, baffle cut, number of

tubes, and number of shells in series and parallel to arrive at the lowest cost exchanger that provides adequate surface

area to meet the duty and pressure drop requirements. The heat exchanger selected will be highlighted and shown as the

final exchanger in the optimization path (Figure 13).

The intermediate heat exchangers shown in the optimization path combined with the remaining information contained in

the Results section provide necessary information to the user that can be used to interact with the program to improve on

the initial exchanger design selection. Techniques for fully optimizing exchanger design are covered in our Shell & Tube

Exchanger training course.

The Results section contains the thermal details necessary to evaluate the performance and operation of the selected heat

exchanger design. Hot and cold side film coefficients, pressure drops, and other basic thermal information can be found by

choosing Results then Thermal / Hydraulic Summary and Performance (Figure 14).



Figure 13. Optimization Path

Figure 14. Performance






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Aspen Shell & Tube Exchanger also produces graphical output. The setting plan is quite useful and allows the design

engineer to view a dimensional drawing of the heat exchanger selected (Figure 15).

4. Further ResourcesFor further information on this workflow, or any of the individual products or elements covered briefly in this written

tutorial, please consult:

Public website:

The following web page provides information on Aspen Exchanger Design & Rating -

http://www.aspentech.com/core/aspen-edr.aspx

Support website:

The support website provides an extensive and growing knowledge base on Aspen Exchanger Design & Rating.

The following knowledge base article provides a getting-started location:

http://support.aspentech.com/webteamasp/KB.asp?ID=130722

Figure 15. Graphical Output



Worldwide Headquarters

Aspen Technology, Inc.

200 Wheeler Road

Burlington, MA 01803

United States

phone: +1–781–221–6400

fax: +1–781–221–6410

[email protected]

Regional Headquarters

Houston, TX | USA

phone: +1–281–584–1000

São Paulo | Brazil

phone: +55–11–3443–6261

Reading | United Kingdom

phone: +44–(0)–1189–226400

Singapore | Republic of Singapore

phone: +65–6395–3900

Manama | Bahrain

phone: +973–17–50–3000

For a complete list of offices, please vis

www.aspentech.com/locations© 2011Aspen Technology, Inc.AspenTech®, aspenONE®, the Aspenleaf logo,OPTIMIZE, andthe 7 BestPractices of EngineeringExcellence

are trademarks of Aspen Technology, Inc. All rights reserved. All other trademarks are property of their respective owners. 11-439-0611

Getting Started - Aspen Shell and Tube Exchanger

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