CAV - Constant air volume

CAV control principle, constant air volume

CAV is the simplest form of ventilation control.

CAV corresponds to a simple on/off timer, which can, for example, switch a unit on at 07:00 and turn it off again at at 17:00.

CAV principle

CAV is typically used when:

  • The required level of ventilation is uniform
  • - There is a low variation in loading from persons in the room
  • - There is low variation in heat load

Example: Copy room, corridors and toilets

Characteristics Advantages Disadvantages
A timer and weekly plan control the activities of the ventilation system

Any timer can be overridden by a switch or motion sensor
Cheap installation

Simple control
Same airflow in every room, regardless of load

Higher energy consumption


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