Demand-controlled ventilation (DCV) is an energy-saving strategy that adjusts outdoor air volumes to meet occupancy demands in variable-occupancy spaces such as classrooms, theatres, conference rooms, and lobbies. DCV saves energy through reduced fan operation and less heating/cooling of excess fresh air during periods of lower occupancy.
DesignBuilder’s DCV tools have been improved in v7.3 to provide simpler controls and more flexible options for managing minimum fresh air flow based on inside CO2 levels. To showcase this, we have prepared step-by-step examples with two common types of Indoor Air Quality Procedure (IAQP) systems:
- AHU IAQP, where the amount of fresh air supplied to zones is controlled by varying the recirculation within the AHU.
- Zone IAQP, a common approach for 100% fresh air units with outdoor air supplied from an AHU, with no recirculation, and the supply air flow rates are controlled within the zone terminal units.
You can find more detailed information and our step-by-step tutorial in our help article.
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