Aspen Plate Exchanger-get Started

8/11/2019 Aspen Plate Exchanger-get Started

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Plate Get Started Page 1

Getting Started Aspen Plate Exchanger

A Brief Tutorial (and supplement to training and online documentation) By Tom Ralston, Product Manager; Steve Noe, Industry Marketing Manager, Aspen Technology, Inc.


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1. Business Background Aspen Plate Exchanger enables optimum design, rating or simulation of process plate & frame, brazed plate or weldedplate exchanges which feature cross-corrugated flow passages. The program is suitable for both the expert and casualusers. Integration with process simulators and other AspenTech engineering tools allows for improved overall processoptimization through better collaboration across engineering disciplines .

Plate Exchanger addresses a wide range of application needs. It serves the process operator, engineering contractor and

the equipment fabricator, allowing sharing of models from conceptual design to operational troubleshooting. AspenPlate Exchanger facilitates the full range of practical process applications including single and multi-componentcondensers or boilers, single phase heating and cooling of vapors or liquids. The program can also handle non-Newtonian fluids. In design mode the program finds the optimum design from generic plate configurations. Leadingmanufacturers plate geometries are also included in a data bank which the user can select for rating or simulationcalculations. There is also a special Design (given Plate) option which allows an engineer to assess how many plates ofa given dimensions are needed to accommodate a given duty requirement.

2. Scope of this DocumentThis document serves as a simple getting started guide, taking you through the most common sequence of operations

an equipment designer would use to design a process exchanger. This guide is best used in conjunction with otherresources to give the new user a comprehensive view of how to use this capability. These include:

Online documentation which can be accessed through the Aspen Exchanger Design & Rating software userscreens (using the F1 key, the whats this button and searches within Help).

AspenTech support website ( support.aspentech.com ), which contains a wide range of knowledge base items withguides, tips and answers to frequently asked questions.

AspenTech training courses, with in-person regional offerings and on-line virtual versions, which provide formaltraining on process modeling and heat transfer technology.

AspenTech business consultants. Pre-recorded tutorials and webinars that provide additional information to that contained here. You will be

required to enter your AspenTech support id and password (go to the animated tutorial section on the link belowfor many of these resources).http://support.aspentech.com/webteamasp/My/FrameDef.asp?/webteamasp/My/product.asp?id1=3030&id2=''&id3=all

This document covers standalone use of the Aspen Exchanger Design & Rating program. This guide assumesthat the user has Aspen EDR V7.0 or newer installed.

3. Problem Overview

We have been tasked with designing a lubricating oil cooler associated with a large rotating machine on a process.

Aspen Plate Exchanger provides the unique capability of automating the design process for optimizing the arearequirements. The Design calculation will determine the dimensions of the plates required and the plate chevron angle,the number of plates and the number of passes. The plate dimensions are derived from a generic set of plates whichthe user can compare with the plates of specific manufacturers. The program uses the Aspen HTFS correlations for heattransfer and pressure drop and thus can provide a verification of likely performance independent of any plate exchangermanufacturer.

The Plate Exchanger design logic will optimize the heat transfer requirements within the specified pressure dropconstraints on both hot and cold sides for any combination of single-phase or two-phase processes. The program hasbuilt in heuristic rules, which explore a wide range of possible configurations to arrive at an area optimum.
http://support.aspentech.com/webteamasp/My/FrameDef.asp?/webteamasp/My/product.asp?id1=3030&id2=%27%27&id3=allhttp://support.aspentech.com/webteamasp/My/FrameDef.asp?/webteamasp/My/product.asp?id1=3030&id2=%27%27&id3=allhttp://support.aspentech.com/webteamasp/My/FrameDef.asp?/webteamasp/My/product.asp?id1=3030&id2=%27%27&id3=all


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

Our oil is an SAE 30 type and the coolant we will use is 40% ethylene glycol solution. In both cases we can use the B-JACdatabank of properties which has single-phase data for these typical industrial fluids characterized with sufficientaccuracy.

4. The Step by Step Guide

Launch the Aspen Plate Exchanger program from the Start button on the Windows Task bar. Select Plate Exchanger(Plate) from the New tab and click OK (Figure 1).

Aspen Plate Exchanger will open with the navigator pane visible on the left hand portion of the display. This serves as atable of contents into both the input and, once the program is run, the output or results. Categories marked with a red(X) contain required entries that must be provided before the program will run (Figure 2).

Figure 1 Start

Units Lub Oil (hot) Glycol-Water

Total Mass Flow kg/s 10 10

Inlet Temperature C 120 30

Outlet Temperature C 80

Inlet Pressure bar(abs) 3Allowble Pressure Drop bar 0.3 0.2

Table 1 Process Conditions


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You can proceed through the input data by either clicking on individual fields in the navigator or by clicking on the Next( ) button to take you directly to the next section where data input is required.

Click on Input | Application Options and verify the default calculation mode as Design. Make sure the global units areset to SI.

The user interface displays user-supplied information in black text and program defaults in red text (Figure 3)

Figure 3 Application Options

Figure 2 Aspen EDR User Interface


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Click the Next ( ) button to navigate to the Input | Process Data form where input data is required. All input fields ineach screen display do not necessarily require user input. Input fields with a white background are optional. Fields with ablue/green background are mandatory items where user input is required.

Enter the process data listed above in Table 1 of the Problem Overview section. The Red ( X) will disappear from thissection when all data required here has been entered (Figure 4).

Click the Next ( ) button to navigate to the Hot Stream Compositions section under Property Data . Use the pulldown for the Physical Properties Package to select B-JAC Properties (Figure 5).

Figure 5 Select Physical Property Source

Figure 4 Tube side Process Data


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Click on the Search Databank button. In the search window type Oil and the autosearch functionality will show namesbeginning with the string typed. Select Oil SAE 30, one of the SAE standard lubricating oils for engine and machine use.

Step 1 Type in the component name in the search field (auto-search will bring up components which start withthe typed string);Step 2 click on the name to highlight the required component;Step 3 - click on the Add selected compounds button.

The above can be repeated to bring up multiple components if required. In our case we only want this singlecomponent. Click OK to return to the composition form (Figure6).

Specify the mass fraction of the oil as 100% (or 1) as shown (Figure 7) below.

Figure 6 Select Components


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Property methods will default to Ideal .

You can preview the calculated properties if you require. On Hot Stream Properties use the Get Properties button toretrieve the properties from the B-JAC Properties package (Figure 8). You will get a warning message that for thiscomponent selection only single phase liquid properties are available.

You have the option of adjusting the temperature range, number of temperature points and pressure levels (importantfor vapors and two-phase) from program defaults. You may also view property plots on the designated tab if required.

For the cold stream composition follow similar steps to those set out above.

Figure 8 Preview Properties

Figure 7 Composition


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When your search the data bank you can type Ethylene Glycol as your starting string and then select Ethylene Glycol40% wt as shown below (Figure 9).

Once you have entered the composition as 100% for the Ethylene Glycol 40% solution (with water) you will see that theinput navigator has no red xs (Figure 10) . As with the hot stream you may preview the properties if you wish.

Figure 9 Select Cold Stream Component


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This means that we have all the data necessary to perform a design optimization.

It is good practice to save the case. On the File menu select Save As , select an appropriate folder and type yourpreferred file name.

Now you can run the design optimization calculation by clicking on the Run button ( ) or from the menu, select Run |Run Plate Exchanger . The design optimization calculations can take one or two minutes to complete.

Aspen Plate Exchanger will vary the plate dimensions including the vertical and horizontal port pitch, the port diameter,the chevron angle and the number passes and total number of plates to find an optimum design.

The exchanger configuration selected by the program can be viewed in Results | Thermal / Hydraulic Summary |Performance.

Here we can see that to satisfy our duty requirements we need an exchanger with 131 plates of 1168mm by 322mm.The plate ports are 75mm diameter and the plate chevron angle is 30 (Figure 11).

You may want to look at the optimization path which shows the exchanger arrangements which were examined in thefinal design search (Figure 12).

Figure 11 Performance Results


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It is possible to customize the screen that appears immediately after you have run a design, rating or simulation. Thisselection is provided under the menu under Tools | Program Settings | UI Options 2 | Plate . Some engineers like to seethe Optimization Path , others the Performance screen or the Overall Summary .

Aspen Plate also produces a range of graphical output. The setting plan, Results | Mechanical Summary | ExchangerDiagram gives a dimensioned sketch of the exchanger we have designed (Figure 13).

Note that right clicking on the diagram reveals a range of options to print or copy and there are a range of viewingoptions also provided.

Figure 13 Exchanger Diagram

Figure 12 Optimization Path


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Left click and drag can be used to zoom in to specific parts of the diagram.

When you have performed a rating or simulation, detailed incremental analysis is also available in tabular and graphicalform.

To make a rating you must go to the menu bar and Run | Update File With Geometry to create a rating case. It is goodpractice to save such a case with a different name from your original design case.

4. Further Resources For further information on this workflow, or any of the individual products or elements covered briefly in this written tutorialplease 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. Thefollowing knowledge base article provides a general index to recent animated tutorials and information white papers:http://support.aspentech.com/webteamasp/KB.asp?ID=130722
http://www.aspentech.com/core/aspen-edr.aspxhttp://www.aspentech.com/core/aspen-edr.aspxhttp://support.aspentech.com/webteamasp/KB.asp?ID=130722http://support.aspentech.com/webteamasp/KB.asp?ID=130722http://support.aspentech.com/webteamasp/KB.asp?ID=130722http://www.aspentech.com/core/aspen-edr.aspx

Aspen Plate Exchanger-get Started

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