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Monday, July 23, 2012

Importing gbXML results from CHAVC

BIM Inside the System

If you are attempting to import the calculated results of Space and Zone Heating and Cooloing Load using gbXML, you are likely to run into a slight problem.  The result of which is that the values that are imported are about 9% of what the expected values should be.  The reason is due to how CHVAC is writing out the gbXML file; it boils down to an improper specification for the unit

According to the standard published at: http://www.gbxml.org/currentschema.php

Valid values for the load units are: BtuPerHour and Watt

(specifically:  )
<xsd:simpleType name="loadUnitEnum">
<xsd:restriction base="xsd:NMTOKEN">
  <xsd:enumeration value="BtuPerHour" />
  <xsd:enumeration value="Watt" />

However, in the gbXML file, what you may find is unit="Watts" insetead of unit="Watt"

Using a simple editor, like Notepad, you can do a search and replace for the unit="Watts" to correct the specification to Watt.  After doing so, you should get the expected results when importing into Revit.

If you are a user of CHVAC, and this issue is important to you, please contact Elite Software directly.


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