Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
I don't know OS, so I can't comment on how to do this in that UI, but I think what you need is to assign your schedule to the maximum outdoor air schedule field. Not: minimum as you stated in your question.
| | 2 | No.2 Revision |
I don't know OS, so I can't comment on how to do this in that UI, but I think what you need is to assign your schedule to the maximum outdoor air schedule field. Not: minimum as you stated in your question. question.... Actually, I just now looked more closely at the screenshots you posted and I see the input field is there for "maximum fraction of outside air schedule".
| | 3 | No.3 Revision |
I don't know OS, so I can't comment on how to do this in that UI, but I think what you need is to assign your schedule to the maximum outdoor air schedule field. Not: minimum as you stated in your question.... Actually, I just now looked more closely at the screenshots you posted and I see the input field is there for "maximum fraction of outside air schedule".schedule".
...oh yeah, furthermore, I see now that the schedule you used should work as a multiplier on the design osa rate to force osa flow to zero at night. Might be worth trying the other schedule to see if that helps!
| | 4 | No.4 Revision |
I don't know OS, so am editing my original answer based on realizing some more things and reading comments added to the orginal question....
In short, I can't comment on how to do this in still have the same suggestion that UI, but I think what you need is to assign should try assigning your schedule to the maximum"maximum fraction outdoor air schedule field. Not: minimum as you stated in your question.... Actually, I just now looked more closely at the screenshots you posted and I see the input field is there for "maximum fraction of outside air schedule".
...oh yeah, furthermore, I see now that the schedule".
The schedule you used applied as you applied it should work act as a multiplier on the design osa rate to force osa flow to zero minimum outside air requirement.
...so, you also asked in your comment: "why do I still see outdoor air at night. Might be worth trying night even though I have this schedule at the other schedule to see if that helps!space/zone level?"
It might be economizer. From the I/O Reference for Controller:MechanicalVentilation:
"The actual outdoor air flow rate may be higher than the minimum if free cooling is available. Regardless, the outdoor air flow rate will not exceed the Maximum Outdoor Air Flow Rate specified in the associated Controller:OutdoorAir object or the Maximum Fraction of Outdoor Air Schedule (if specified) times the current system supply air flow rate."
