Time-Controlled Ventilation

A time-controlled ventilation (TCV) system is a low-cost way to achieve ongoing energy savings. Facilities with highly predictable occupancy that is limited to a set number of hours per day, such as some offices and classrooms, can significantly reduce energy consumption with TCV.

Ventilation systems in an office building, for example, can be set to operate during regular occupant hours only. At the end of the workday, offices shut off or reduce ventilation to minimum levels.

Time clocks control ventilation to occur only during regular business hours. During this time, outside ventilation air is often set at full design occupancy, regardless of actual occupancy. When occupancy falls below the maximum design level during regular occupant hours, unnecessary ventilation may occur. TCV systems save energy during unoccupied hours only.

Occupancy sensors and carbon dioxide (CO₂) sensors are other common demand-controlled ventilation strategies you can apply in your building.