Contam Help

8/6/2019 Contam Help

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Define the Zone

Right click within the rectangle to activate the pop-up icon placement menu and select Zone.

This will place an undefined zone icon (as indicated by the red color) within the bounding rectangle.

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Single Zone Tutorial


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Double-click on the zone icon to display the Zone Properties dialog shown below. Name the zone A and setthe volume at 100 m. Notice the Floor Area will automatically be calculated by dividing the volume by thedefault level height of 3 m. Click the OK button to set the zone properties as indicated by the black zone icon.

Define the Airflow Paths

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Right click on the left hand wall and select Flow Path from the icon placement menu. This will place anundefined path icon on the wall.

Double-click on the path icon to display the Airflow Path Properties dialog box shown below.

Click on the New Element button to display the list of Airflow Element Models shown below.

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Select the Orifice Area Data model and click the OK button. This will display the Powerlaw Model: Orificedialog box shown below. Name the airflow element Orfc1, provide a Descripton of 100 cm2 orfice, andclick the OK button.

The Airflow Path Properties dialog box should now indicate the Name of the Airflow Element Orfc1 alongwith its Model Summary information as shown below. Click the OK button to set the airflow path properties asindicated by the black airflow path icon.

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Now create a fan to force airflow through the zone, by adding another path to the opposite wall and activatingthe Airflow Path Properties. Create a new Constant Volume Flow model having a flow rate of 100 m/h asshown below and click OK.

Select the Flow Path tab of the Airflow Path Properties dialog and set the Positive Flow Direction to beFrom zone A to zone Ambt as shown below and click OK.

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You should now have a SketchPad that looks similar to the one below.

Steady State Airflow Simulation

Set the simulation parameters

Display the simulation parameters to insure they are set to run a steady state airflow simulation by selecting SetSimulation Parameters from the Simulation menu (or use the F4 function key).

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Review Airflow Simulation Results

You should now see the results of the simulation displayed on the SketchPad similar to the one below. Thegreen lines indicates the direction and relative magnitude of airflow rate and the red lines indicates the directionand relative magnitude of the pressure drop across the flow paths. You can highlight each flow path to display

the results in the left-most pane of the status bar and the floating status window if it is activated (Ctrl+T totoggle floating status window).

Define a Contaminant

In order to perform contaminant calculations, you must create at least one contaminant to be simulated.Activate the Project Species dialog box via the Data - Contaminants ... menu command. Click the Newbutton to display the Species Properties dialog box shown below and create a species named CO2 having theproperties shown below.

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Click the OK button, and the Project Species dialog box should now indicate that the project contains onespecies and that species is used in the simulation which makes it appear in the Contaminants list as well, i.e., acontaminant is a species that is set to be used in the simulation. This allows you to activate and deactivatecontaminants between simulations without losing the properties. Now click the OK button to set the propertiesof the species/contaminant.

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Define Contaminant Source

Now that the contaminant is defined, a source can be created and placed within the zone. To create a source,right click on a blank cell within the zone and select Source/Sink from the icon placement menu. This willplace an undefined source/sink icon on the SketchPad.

Double-click on the source/sink icon to display the Source/sink Properties dialog box shown below.

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Click on the New Element button to display the list of Source/Sink Element Models shown below.

Select the Constant Coefficient model and click the OK button. This will display the Constant Coefficient

Model dialog box shown below. Name the element and set the Generation Rate to 0.01 g/s as shown belowthen click the OK button to set the element properties.

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You should now have an element set for the source as displayed below. Click the OK button to set theproperties of the source.

The source/sink icon should now be black to indicate that its properties are defined as shown below.

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Run Contaminant Simulation

Display the simulation parameters to insure they are set to run a steady state airflow and steady statecontaminant simulation by selecting Set Simulation Parameters from the Simulation menu (or use the F4function key). Then click the Run button to perform the simulation.

Review Contaminant Simulation Results

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After running the simulation you should see the airflow results on the SketchPad as before. Highlight the zoneicon and select View - Results Display Window from the menu. This will display the window shown belowwith both the contaminant concentration and airflow results for the highlighted zone.

Run Transient SimulationYou can also run transient simulation wherein the airflow and contaminant (or only the contaminant) varieswith time. The airflow can vary due to variations in driving forces such as windspeed and direction, outdoortemperature, ventilation system flows or changes in the configuration of building openings, e.g., opening andclosing of doors and windows. Contaminant concentrations can change due to these changes in airflows as wellas changes in source and sink emission and removal rates.

This example will demonstrate the time variation of both airflow and contaminant concentrations by simplyscheduling the fan airflow rate to vary with time while the source will still emit at a constant rate as before.

Define a Schedule for the Fan

Double-click the fan icon to display the Airflow Path Properties dialog and select the Filter and Schedule tab.Click the New Schedule button to display the Week Schedule dialog then click the New day Schedule button todisplay the Day Schedule dialog box. Define a schedule that turns on (a value of 1.0) and off (a value of 0.0)

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every hour until 06:00:00. Give it a name, e.g., FanSched, as shown in the following figure, and click the OKbutton.

Select all of the days on the left side of the Week Schedule dialog box, and click the Replace button to set themall to the newly defined day schedule. Give the schedule a name as shown in the following figure and click theOK button.

The schedule for the fan airflow path should now be set to the one you just created as shown in the AirflowPath Properties dialog box in the following figure.

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Run Transient Simulation

Display the simulation parameters to set them to run a transient airflow and transient contaminant simulation byselecting Set Simulation Parameters from the Simulation menu. Set the Simulation Dates and Times and theSimulation Time Steps as shown in the figure below. Select the Output tab and be sure the ContaminantConcentrations check box labeled Detailed is checked. Click the Run button to perform the simulation.

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View Results of Transient Contaminant Simulation

After the simulation has been performed, right-click on the zone icon and select Plot Contaminants from thepop-up menu. Click the OK button on the Chart Control dialog box to display the transient concentration resultsas shown in the following figure.

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