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Demand-controlled ventilation

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Title: Demand-controlled ventilation  
Author: World Heritage Encyclopedia
Language: English
Subject: Gas detector, Carbon dioxide sensor, Air changes per hour, Displacement ventilation, Aquastat
Collection: Heating, Ventilating, and Air Conditioning
Publisher: World Heritage Encyclopedia

Demand-controlled ventilation

Demand Controlled Ventilation (DCV) is automatic adjustment of ventilation equipment to meet occupant demand. DCV is a control method used to modulate the volume of fresh air taken into a building or other occupied space by mechanical air conditioning equipment. Sensors or time schedules are used to estimate ventilation need and automated control loops are used to meet a set point determined by a design engineer. The design engineer references a codified standard when determining ventilation set points.

There is a significant energy saving potential in rigorous outdoor air control. [1]

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)[2]
  • 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.[3]
  • Positive control gates
  • Ticket sales
  • Security equipment data share (including people counting video software)[4][5]
  • Inference from other system sensors/equipment


  1. ^
  2. ^ KMC Controls. (2013). Demand Control Ventilation Benefits for Your Building. Retrieved 25 March 2013, from
  3. ^ Mysen, M., Berntsen, S., Nafstad, P. & Schild, P. G. (2005). Occupancy Density and Benefits of Demand-controlled Ventilation in Norwegian Primary Schools. Energy and Buildings, 37(12), 1234–1240. Retrieved October 9, 2012.
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