■ Use the button on the right to enter Space: Actual Supply Airflow - Space: Calculated Supply Airflow for Formula.
11 Click OK.
The Actual Calculated Airflow calculated value is added to the scheduled fields (at the bottom of the list) and will display as a column in the schedule.
Format the calculated value parameter
12 On the Formatting tab of the Schedule Properties dialog, in the Fields list, select Actual Calculated Airflow, and click Conditional Format.
13 In the Conditional Formatting dialog, do the following:
■ Verify that Actual Calculated Airflow is selected for Field.
■ Select Not Between for Test.
■ Enter -35 L/s and 35 L/s for Value.
Notice that the conditions that you specified display under Conditions to Use.
■ Click the Background Color and select Red in the Color dialog.
■ Click OK twice.
The Actual Calculated Airflow calculated value parameter allows you to immediately determine what rooms do not meet the design requirements as they are red in the schedule.
Organize the data
14 On the Sorting/Grouping tab of the Schedule Properties dialog, do the following:
■ Select Space: Number for Sort by.
■ Verify that Ascending is selected.
■ Select Footer, and Count and totals.
■ Select Blank line.
■ Verify that (none) is selected for Then by.
■ Verify that Grand totals is cleared, and Itemize every instance is selected.
■ On the Filter tab, select System Type for Filter by, equals, and select Supply Air.
■ Click OK.
A new view opens called Air Terminal Schedule and is located under Schedules/Quantities in the Project Browser. Notice that the data is sorted according to room number. The red values in the Actual Calculated Airflow column immediately report that the actual amount of air being supplied to the room does not yet meet the design airflow requirements within the range of plus or minus 35 L/s.
This schedule is not only a construction document but also a design tool. You can change one or more entries in the schedule to modify your system. Each change is dynamic and immediately propagates throughout your project. This is because you are modifying the digital database of building information. This digital database information source is the integral concept of Building Information Modeling (BIM).
Next, you use the schedule as a design tool to modify the airflow for an air terminal to satisfy the design requirements.
Use the schedule as a design tool
This closes all open windows that are hidden by the schedule.
NOTE If a different project is also open, click Window menu and select the project to make it the active view, and click File menu ➤ Close to close the project.
16 In the Project Browser, under Views ➤ Mechanical ➤ HVAC ➤ Floor Plans, double-click 1 - Mech to make it the active view.
17 Enter ZR, and draw a zoom region around Office 101 located on the left outer wall of the floor plan.
18 Enter WT to tile the 2 views.
The schedule and the floor plan display simultaneously in the drawing area.
19 In the schedule, select the 150 L/s Flow parameter (in the Flow column) for the Office 101 air terminal.
A cursor displays in the selected cell in the schedule enabling you to modify the parameter, and if you click in the floor plan to make it active, the selected air terminal displays in red. Notice that the Flow column parameters are the only parameters that you can define in the schedule. The other parameters are design or calculated parameters.
20 Delete 150 L/s enter 120, and press Tab.
The Actual Calculated Airflow value displays in white indicating that it now complies with the Office 101 airflow design requirements.
NOTE After you select and modify data in a schedule, the associated system component is immediately selected and modified in the project as if you used the Element Properties dialog. This allows you to use schedules to make multiple modifications in one view. These changes dynamically propagate throughout your project because you are changing the digital database of building information. Tagging an Air Diffuser
21 Select Tag from the Mechanical tab on the Design bar. 22 Select By Category.
23 On the Options bar, click Leader to clear this option. 24 Click on a diffuser to add a tag.
TIP Editing diffuser tags in schedules, rather than one by one in a drawing, speeds the design process. Optional: Modifying Other Parameters
The drawing for the next exercise provides completed values.
25 Modify the other supply air terminal Flow parameters for both floors so that the airflow design requirements are met.
NOTE Do not modify the return or exhaust air terminals as these are not supply air terminals and do not affect the supply airflow.
After you modify the airflow parameters, all Actual Calculated Airflow parameters display in white.
IMPORTANT By modifying each supply air terminal airflow parameter, you are changing the air terminal connector size. Air terminal connector sizes are used to calculate airflow but are also used to calculate ductwork sizing.
26 Close the schedule view, and maximize the 1 - Mech floor plan view. 27 If you want to save your work, click File menu ➤ Save.
28 In the Save As dialog, enter Using Schedules Training for File name, navigate to the folder of your choice, and click Save.
In this exercise, you created a schedule to assess airflow for each room in the building. You then used this schedule as a design tool to modify the airflow so that it meets the design requirements. You modified the airflow parameters directly in the schedule and all changes occurred dynamically and propagated throughout the project. This occurred because you were modifying the digital database of building information that the project sources. This is the power of BIM.
In the next exercise, you create air systems.