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DesignSpecification:OutdoorAir ProportionalControlBasedOnOccupancySchedule method

asked 2023-11-17 11:57:12 -0600

xchen's avatar

updated 2023-11-17 12:22:31 -0600

I'm reading the Input Output Reference Manual for v9.5 and v9.6. For DesignSpecification:OutdoorAir objects, one of the outdoor air method is ProportionalControlBasedOnOccupancySchedule. However, none of the following fields that define the outdoor air flow, i.e. Outdoor Air Flow per Person, Outdoor Air Flow per Zone Floor Area, Outdoor Air Flow per Zone, Outdoor Air Flow Changes per Hour, is used when ProportionalControlBasedOnOccupancySchedule is selected according to the reference text.

And when I select this method in my model, the hourly output ventilation rate does not follow the occupancy schedule either.

I'm wondering when using this method, how is the outdoor air flow defined? How is it "proportioned"?

I use this method in Controller:MechanicalVentilation, "System Outdoor Air Method" field, without DCV enabled and no economizer or night cycle.

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answered 2023-11-20 01:09:19 -0600

Keigo's avatar

updated 2023-11-20 01:10:14 -0600

ProportionalControlBasedOnOccupancySchedule does not work. You can raise the issue ( I didn't do so just because it did not affect my models. I always use IndoorAirQualityProcedure to model DCV controlled by CO2 concentration.

Alternatively, you can add the occupancy schedule (i.e. the schedule you put in Number of People Schedule Name in People) to Minimum Outdoor Air Schedule Name in Controller:OutdoorAir in order to control the outdoor air flow rate based on the occupancy schedule.

Outdoor Air Method in DesignSpecification:OutdoorAir can be Sum Flow/Person, Flow/Area or Flow/Zone.

Controller:MechanicalVentilation, ZoneControl:ContaminantController and ZoneAirContaminantBalance are not used. Please delete them.

If the occupancy schedule is different in each room, I think you can use EMS to override each outdoor air flow rate in DesignSpecification:OutdoorAir.

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Asked: 2023-11-17 11:57:12 -0600

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Last updated: Nov 20