Viewlet Title

Getting Started with Coil Wound Heat Exchange in Aspen Exchanger Design and Rating 3: Defining Stream Process and Property Data

 

Description

Step by step walk through on how to define stream process and physical property data for a mixed refrigerant process using Coil Wound exchanger. Learn about process data requirements. Discover how to enter physical property data by leveraging the integrated Aspen Properties databank to provide superior prediction for your LNG plant.

About the Series

Coil Wound heat exchanger, also known as Spiral Wound or Wound Coil exchanger, is a principal heat transfer equipment in LNG process. Using Aspen Coil Wound, available in Aspen EDR from V9.1 and beyond, you can rigorously rate and/or simulate Coil Wound Exchanger.

In this Getting Started series, you will learn how to simulate a multi-stream heat exchanger using Aspen Coil Wound. Using the provided inlet conditions, stream compositions, and exchanger geometry data in Coil Wound Getting Started Guide provided in the product documentation, you will build a simulation case to determine the outlet conditions of the streams.

1.     Creating a Coil Wound Simulation

2.     Configuring Stream Occupancy

3.     Defining Stream Process and Property Data

4.     Specifying Coil Wound Bundle Geometry

5.     Viewing Coil Wound Results

By the end of the series, you will be able to understand the model requirements, and simulate a principle heat transfer equipment in LNG process using Aspen Coil Wound.

Script: Defining Stream Process and Physical Property Data

In this video, you will use the Coil Wound model you have configured and continue preparing it by entering stream process and physical property data.

To enter the process data, or inlet and outlet conditions, navigate to the Process Data form using the EDR Navigator.

You can choose to complete these steps using data of your own, or you can choose to follow these instruction using a sample set of data provided in the product documentation.

To access the product documentation, you can click the question mark icon in the top right corner of the application window, press the F1 key, or use the command on the Resource tab like I just did.

Under Content navigation pane of the Help window, go to Aspen Coil Wound Exchanger topic, then click on CoilWound Getting Started Guide. Now expand the Process Overview.

Then return to the Application window, before you continue go to Home | Set Units group, and make sure that the appropriate unit set is selected. If you chose to follow these steps using the sample set of data, you will want to have SI units selected.

On Process Data form, enter the process data from the table provided in Process Overview.

One of the enhancements I have noticed is EDR has significantly improved responsiveness in the copy, cut and paste functionality. Here can see how quick and easy it is for me to pass the data from the provided tables

Process data requirements essentially break down into 3 state variables: the flow rate of the stream, its pressure – both of which are mandatory-, and finally you have the option to provide either the stream temperature or enthalpy values.

When sufficient data has been entered for all tabs in a form, the red cross icon beside the Navigator option will disappear.

Next, let’s enter Physical Property Data

Navigate to the Physical Property Data | Stream 1 Compositions form. On the Compositions tab use the drop-down to specify the Physical property package.

You have the choice of several databanks. Select the Aspen Properties databank as the Physical property package and click Search Databank at the bottom of the grid.

The Find Compounds dialog box appears.

Type in the name of the compound you are looking for in the search field.

Once you have entered it, click the Find Now button and search for the compound in the Compounds found matching the specified criteria box.

Click on the desired compound and click Add selected compounds. Repeat the process for each compound listed in the Stream Compositions grid.

Once all of the compounds have been selected, click the Use Selected Compounds button to exit the Find Compounds dialog and return to the Composition tab.

Change the Composition specification to Mole flowrate or % and enter the composition of stream 1 from the Stream Compositions grid. If a compound isn’t present in the stream, leave the Composition blank.

Enter the compositions for the other four streams using Aspen Properties as the Physical property package. 

All streams using Aspen Properties have the same compounds listed on the Composition tab. You will not need to select the compounds again for other streams

After you have successfully define process and physical property data for your exchanger, it’s time to specify the geometry of the exchanger you are trying to model.

Playing the Viewlet

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