DCV systems are ventilation systems in which the airflow rate is controlled automatically according to a measured demand at room level. This means that DCV systems must have a feedback control, for instance a sensor in the room giving a continuous measurement of the indoor air quality. This signal is then used to control the airflow rate according to the desired indoor air quality level.
VAV stands for Variable Air Volume. It is a broader term than DCV, as it encompasses all systems with variable airflow rate, irrespective of the type of control. Only VAV systems that control the airflow rate according to a measured demand in the room, and not according to a preset value.
Demand-Controlled Ventilation (DCV) must become more reliable to close the gap between theoretical and real energy-performance. These following critical control points must be addressed during commissioning of a DCV:
- energy-efficient and accurate DCV system
- balancing procedures
- handover procedures
Source from article on “Commissioning for energy-optimal Demand-Controlled Ventilation” by Mads Mysen, Peter G Schild, Axel Cablé and John Woollett