CBECC-Com dining spaces minimum ventilation too high

asked 2019-08-01 11:22:39 -0600

bbrannon4 gravatar image

updated 2019-08-01 19:51:25 -0600

Has anyone come across an issue in CBECC-Com 2016 where a space defined as dining has very high minimum ventilation rate in the proposed, but the baseline is correctly being set to 20% of the max airflow? This is an envelope and lighting only compliance run, so the baseline in both models is being automatically created and sized. I've tested my other spaces, mostly open office, and that ventilation seems to be working correctly.

I did a sample model where I just switched that zone to an office space, and it works correctly, so this seems to be a specific problem to the dining space type, and the DCV ventilation in the model.

The result is that the outside air volume of the proposed isn't able to ramp down as far as the baseline during times of lower occupancy, which in this climate is causing the heating energy to go way up. I've submitted this to NORESCO, but thought I'd ask here too.

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