Samiksha Jaiswal (Editor)

Demand controlled ventilation

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Demand Controlled Ventilation (DCV) is automatic adjustment of ventilation equipment according to occupant choice. DCV is a control method that modulates the volume exchange of fresh or outside air into an enclosed space by mechanical air conditioning equipment. Design engineers reference a codified standard when determining ventilation set points in order for sensors or time schedules and control loops to achieve indoor air quality.

There is a significant energy saving potential in rigorous outdoor air control.

Common reference standards for ventilation:

  • ISO ICS 91.140.30: Ventilation and air-conditioning systems
  • ASHRAE 62.1 & 62.2: The standards for Ventilation and Indoor Air Quality

    • Examples of estimating occupancy

  • Timed schedules
  • Motion sensors (various technologies including: Audible sound, inaudible sound, infrared)
  • Gas detection (CO2) In a survey on Norwegian schools, using CO2 sensors for DCV was found to reduce energy consumption by 62% when compared with a constant air volume (CAV) ventilation system.
  • Positive control gates
  • Ticket sales
  • Security equipment data share (including people counting video software)
  • Inference from other system sensors/equipment

    • References

    Demand controlled ventilation Wikipedia
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