ANSI/ASHRAE Standard 140
Some result differences were noted between the February 14, 2014 release of Autodesk Green Building Studio (DOE-2.2 48r 64-bit) and GBS version 3.4. Version 3.4 is the latest version of GBS to be STD-140 test results submitted for evaluation; the version 3.4 results were evaluated and met the criteria, under ANSI/ASHRAE Standard 140, Standard Method of Test for the Evaluation of Building Energy Analysis Computer Programs).
Conclusion: There is no meaningful difference between GBS DOE-2.2 48r 64-bit release results and other simulation tools.
The minor differences, where noted, are due to computational changes to DOE-2.2 48r. Refer to this blog article for more details: Autodesk Green Building Studio Adopts the newest DOE-2.2 version (48r in 64-bit) for our February 14, 2014 Release .
Differences between GBS results and other simulation tools, where noted in Section 5-3b for calculation of COP2 minimum and maximum values are due to the sensitivity of significant figures used in calculating the COP2. See here for more details.
Analytical Results Regression Tests
The Analytical Results Regression Testing passed for the February 2014 release and results are available for download: GBS Analytical Results Regression Testing, February 2014.
Vasari/Revit Conceptual Mass Model Energy Simulation Results Regression Testing
The Vasari/Revit Conceptual Mass Model Energy Simulation Results Regression Testing passed for February 2014 release and results are available for download.