Simulate a Water Cooler1 1Simulate a Water Cooler 1999 AEA Technology plc - All Rights ReservedACOL 1_1.pdf 2Workshop 2WorkshopThe purpose of this module is to determine the tubeside outlet temperature for a forced-draught air-cooled heat exchanger by simulating a water cooler.Learning ObjectivesOnce you have completed this section, you will be able to: Use the ACOL Interface to enter Air Cooled Heat Exchanger design information. Enter physical properties by the in-built NEL 40 databank. Save datasets.Workshop3 3Process OverviewDetails of the process data and some basic geometric data are shown in the following windows.Click on New to create a new project file.Building the SimulationThe following Start up screen appears. Go to the Simulation Option field. Use the drop down list to select Tubeside Outlet Temperature. The New option clears any existing data. 4Workshop 4Next, we can begin entering the geometric data for the exchanger. Before entering data however, it is necessary to establish the units that the data will be entered in. On bottom left side there is a box marked Units. Ensure that the units are SI.1. Enter the geometric values shown below: 2. Click the Apply button.3. Click on the Bundle Specification tab. 4. Enter the following details of the number of tubes and passes for the bundle.You will notice that 160 tubes are specified with 4 passes, implying that each row will have the same number of tubes. Select Staggered - even rows to left from the Type of Bundle drop down menu.Click the Apply button to accept your entries. Clicking Next or OK will not record the values you entered.Workshop5 5Clicking on the OK button will give a pictorial representation of the pass layout. All the rows will be the same colour when you first see this window.Each pass is indicated by a different colour. Rows are numbered from bottom to top. Therefore, Row 1 is the bottom row and Row 4 is the top row.In the Pass section, click on the 2 radio button. Move the mouse so it is positioned over the first tube in the second row from the top, and click. Hold the mouse button and move to the last tube in the row and release the mouse.The entire row now changes from yellow to orange; the row is now designated as Row 3 = Pass 2.5. Repeat this action for the remaining rows using the following information: Row 2 = Pass 3 Row 1 = Pass 46. Click Apply. Note the arrows pointing upward. This indicates that the X-side flow direction is upwards, so the exchanger has been specified as counter-current.Row, tube, and pass numbers are shown on the bottom of the Pass Layout screen. The width and height are also displayed here. 6Workshop 67. Enter the Bundle Geometry for the exchanger (ensuring that you have the correct unit system). 8. Click Apply and Next. Click Next on the Material Properties window. Enter the remaining fin information as shown below:For the tubeside fouling, ACOL has many different options to consider such as a fouling resistance, thermal conductivity and a thickness layer. In this example, Constant Resistance is already selected as the Fouling Option. Although you only need to enter the required fields (marked by an asterisk), you can enter other information if you want.Workshop7 7The fouling resistance can be entered on the Tubeside Fouling tab of the Process Data input. Enter a Fouling Resistance of 0.00002 m2k/w.Click the Apply button and then click Next. The following window appears. Enter a Inlet Dry Bulb Design Temperature of 37oC. 8Workshop 89. Click Apply and then go to the Process Streams tab. Enter the data shown below for both streams and click Apply.ACOL automatically picks up the physical property data for air on the X-side. However, we need to enter physical property data on the tubeside.10. From the Input menu, select Physical Property Data. Enter Tubeside in the Name field. Enter the remaining information.Workshop9 9Running the FileBefore running the file, it is important to save the dataset. Open the File menu and select Save As. Run the file by clicking on the Run button on the main toolbar, or open the Run menu and select Calculate All. As ACOL prepares the file, it displays its progress in the following window.The Status window should indicate ACOL successfully complete. If there is a message indicating a fatal error, then another message box appears with information on locating and fixing the error:Use the information provided by the Error/Message Log to edit the dataset. Save the file and then re-run. This error log can be checked at any time after a run has been performed. Select Error/Message Log under the Output menu.The same data that we entered using the windows can also by entered on the API Input form: Select API Input from the Input menu. A Specification Sheet appears. Note that the blue highlighted values are those that you entered. Click on any blue cell to change the information Save your case!Run button 10Workshop 10in it.You can also change the measurement units if you want. Under the Units menu, you can change the units from SI (which is what we specified at the beginning of this exercise) to either British Imperial Units or Metric Units.ResultsView the output by selecting Results Summary from the Output menu.The Summary box contains the flowrates, temperatures and pressures for the tube and X-side. You should notice that the tubeside exit temperature is 54C (129F), whereas a value of 56C (133F) was expected. Thus the exchanger can perform a greater duty than originally expected.The Summary box contains information on the heat load, overall heat transfer coefficients and the mean effective temperature difference. Also, a duty ratio is indicated, where a value of 1.08 indicates that the exchanger can achieve a duty of 8% greater than that originally specified.