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IDF Sizing:System Parameter Values Disagree w/ OpenStudio Model

asked 2021-06-03 08:44:27 -0500

updated 2021-06-04 08:25:43 -0500

I've been finding that inputs entered into OS:Sizing:System in the OpenStudio HVAC loop interface oftentimes do not translate correctly into the Sizing:System object in the IDF that the model generates. In the images attached, Central Heating Maximum System Air Flow Ratio is hardsized in OpenStudio, but autosized in the IDF. I have noticed this issue for Central Heating Design Supply Air Temperature, 100% Outdoor Air in Cooling, and 100% Outdoor Air in Heating. I have performed basic troubleshooting - ensuring that I save entries before re-running, that I am comparing to the updated IDF, and that I'm pulling from the right directory. Is there an explanation for this model behavior and any known troubleshooting methods?

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answered 2021-06-03 10:30:21 -0500

This issue appears to have been fixed a couple years ago; is it possible you are using an older version of OpenStudio? If so, you can update to a newer version and it should work properly.

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Yes - by necessity I'm working with OS 2.7.0/EP 9.0, but I can adjust my workflow to make direct IDF edits on these fields. Good to know that this was a documented issue. Thanks

jbatt's avatar jbatt  ( 2021-06-03 10:36:08 -0500 )edit

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Asked: 2021-06-03 08:44:27 -0500

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Last updated: Jun 03 '21