Viewlet Title

Getting Started with Coil Wound Heat Exchange in Aspen Exchanger Design and Rating 4: Specifying Coil Wound Bundle Geometry

 

Description

Using provided geometry information, learn about bundle, tubes and bundle streams for a coil wound exchanger in Aspen Coil Wound and prepare it for simulation.

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: Specifying Coil Wound Bundle Geometry

In this video, I will specify the Coil Wound Bundle Geometry for a 2 bundles, and shell side evaporation coil wound exchanger using Aspen Coil Wound within EDR. I’ll build on the case I previously created.

Navigate to the Exchanger Geometry | Bundle Geometry page.

The three tabs here, Bundle, Tubes, and Bundle Streams, contain all of the inputs necessary to specify the bundles in an exchanger. 

The Bundle tab contains input related to the overall bundle, the Tubes tab contains inputs related to an individual tube, and the Bundle Streams tab contains inputs for specifying how the streams are arranged in the bundle.

To help you get started, a sample set of data has been provided in the product documentation from Coil Wound getting started guide.

From the Geometry Overview table, input the geometry information in the bundle and tubes tabs. You can also substitute your own data as you follow along with me.

All tubes in a bundle have the same length and helix (winding) angle. 

A layer is made up of multiple tubes that are coiled with the same diameter.

The longitudinal pitch between two adjacent tubes in a layer and the transverse pitch between adjacent layers will be the same for all layers in a bundle.

Several layers make up a bundle, with the tubes in adjacent layers being wound in opposite directions.

Navigate to the Bundle Streams tab. By default, the number of tubes in each bundle is split equally among the streams.

Note that the tubecount inputs for the shellside streams have been disabled. 

As the number of tubes for each stream is available, input those numbers here.

Once all the required data has been entered, it is important to save the file. Do so by going to File | Save or Save As.

EDR allows you to automatically save your work at defined time intervals. You can go to File | Options | General to view save options.

Once saved, run your case by clicking run.

Playing the Viewlet

A Viewlet is an animation sequence constructed by capturing a series of screen shots from a software application. Viewlets are used to demonstrate product features and to train users in simple procedures.

Viewlet screencasts are played using Camtasia Studio.  Click on the attachment above to launch the program.