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. [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
References
- ↑ http://www1.eere.energy.gov/femp/pdfs/fta_co2.pdf
- ↑ KMC Controls. (2013). Demand Control Ventilation Benefits for Your Building. Retrieved 25 March 2013, from http://www.kmccontrols.com/docs/DCV_Benefits_White_Paper_KMC_RevB.pdf
- ↑ 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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