Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
When you specify OA flow/person in the DesignSpecification:OutdoorAir object in EnergyPlus, during the sizing run, the min OA flow rate for the system is determined at each hour during of the design days like this: (people * people fraction * oa/person) + (area * oa/area) + (oa fixed rate). The min OA flow for the system is then set to the highest value that occurs during the sizing days. During hourly simulation, if DCV is not enabled, the min OA flow will be set to the value from the design day no matter how many people are in the zone. If DCV is enabled, the min OA will be calculated based on the number of people, and the system will ramp down OA accordingly.
In OS, you turn DCV on/off using the toggle on the AirLoop > Controls tab. By default, it is turned off.
