Is there a way of modeling fixed outdoor air fraction for VAV systems in CBECC-Com?

asked 2015-06-05 08:08:52 -0500

My hunch is that this is only possible through the Exceptional Design Compliance process, but I just wanted to see if there was a way of doing this within CBECC-Com.

I'm looking to model fixed outdoor air fraction for a system that varies supply airflow (the design OA is greater than the minimum required). My assumption is that CBECC-Com defaults to providing the design outdoor air at all times regardless of the supply airflow rate.

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I'm going to try to use the Scheduled option for the Outside Air Control Schedule Method input and set the min fraction sch to be the outdoor air fraction.

anchapin ( 2015-06-05 08:24:07 -0500 )edit

After adding the min fraction schedule, I found out that this Outside Air Control Schedule Method is not allowed for compliance analysis simulations.

anchapin ( 2015-06-05 12:59:07 -0500 )edit

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Yes, you are correct, CBECC does not currently support modeling fixed OA fraction systems. If you feel that this capability is important, I recommend submitting an 'Other' issue and specify it as a feature request: http://bees.archenergy.com/issue.html This will allow us to formally track it as a possible feature for future versions.