Autodesk 235B1-05A761-1301 User Guide - Page 261
Exporting Duct System Data, In the Duct System XML Export dialog
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To be eligible for exporting, each system must have at least one start point and one endpoint. A system is defined as any ductwork between a start point and one or more endpoints. A start point must consist of a fan or other air handling device. Endpoints must consist of outlet devices such as air terminals. Flow values must be assigned to outlet devices in order to properly size system components. For example, a supply system uses an air handling unit to supply air to several rooms. Each room includes an air terminal as the outlet for the air. In this example, the system includes all ductwork from the air handling unit to each air terminal. If there was no air handling unit in the drawing, you would not be able to export the system data. TIP To preview the connectivity of a system, select an object within the system, and click [Duct, Duct Flex, or Duct Fitting] tab ➤ Modify panel ➤ Show Connected Objects drop-down ➤ Show Connected Run . These are additional considerations prior to exporting data: ■ Start points can be fans, air handling units, or similar MvParts such as a VAV boxes, mixers, or economizers. ■ To ensure proper sizing, assign flow values to all outlet devices, such as air terminals. For more information on modifying MvPart properties to assign flow values, see Configuring Mechanical Parts for Analysis on page 196. ■ If the outlet device is an end cap, it is assigned a flow value of zero. ■ Variable air volume controllers (VAV boxes) with 2 connectors, such as single duct or shut off VAV boxes, are considered part of the duct run unless they are ending a branch. If they end a branch, they must have a flow value assigned. If they do not end a branch, the flow value assigned to them is not used. ■ VAV boxes with more than 2 connectors, such as dual duct boxes, are considered end points. Any ductwork beyond the VAV box is not considered. The flow value assigned to the VAV box connector is used for analysis. ■ Duct segments that contain takeoffs are considered as one plenum duct when exported. If you want the analysis tool to assign different sizes to different parts of the duct, use the break command to divide the duct into multiple segments, and insert transition fittings where appropriate. Prior to exporting, consult your external analysis package to see if there are any additional requirements you need to include in your system. For example, you may need to specify the ASHRAE fitting type for all duct fittings as shown in Specifying ASHRAE Fitting Types on page 242. There may also be system design constraints that you need to consider. To export duct system data: 1 Click ➤ Export ➤ Duct XML. 2 In the Duct System XML Export dialog, specify a path and file name for the output file. Note that the file extension for a DDXML file is *.ddx. 3 Click Select Object. 4 In the drawing, select any duct segment or fitting within the system that you want to export. 5 In the Duct System XML Export dialog, specify a system for Select System Type. 6 Click Start. 7 When the export is complete, the DDXML file is created in the specified directory. 8 If any errors were encountered during export, click View Event Log to see a list errors. To modify your system before attempting to export again, see Modifying a Duct System on page 219. Exporting Duct System Data | 243
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