Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Yes, set the space OA to 0 in the Design Specification Outdoor Air object if there is no requirement for outdoor. The amount of outdoor air required for this space will then not be included in the calculation of the amount of system outdoor air. It is not OS that requires the Design Specification Outdoor Air object, it is the underlying engine that requires that information. I imagine that if a design spec object were missing the program could assume 0 but then what if a user just forgot to include that zone then the results would be suspect without the users knowledge. So the program requires all zones to specify the amount of outdoor air when a mechanical ventilation controller is used.
