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Air quality control with VOC (volatile organic compound) sensors inresidential buildings could increase user comfort by adapting to the actualcontaminant level. Preliminary tests assessed the dynamics of VOC levels insingle-family passive houses with a ventilation system. At normal andexceptional usages, sufficient signal variations were measured for airquality control. An air quality control was developed and tested in foursingle-family passive house dwellings to control the building ventilationsystem via VOC sensors and a special adaptation algorithm to handle variablecontaminant loads and sensor drift. Results showed good operation of the airquality control for the ventilation system, detecting changing contaminantswithin a few minutes and changing the air flow rate in the buildingimmediately. The 43 VOC sensors used during the monitoring had more than1.2 million working hours in total without any electrical failure, but with aloss of sensitivity for the calibration gas CO. The air quality control couldmanage that loss of sensitivity and worked well till the end of the fieldtest. A comparison between VOC and CO<sub>2</sub> sensors in one building resultedin more detailed information about emission rates in the room with the VOCsensor, allowing one to get a better reaction of the ventilation system

Use of VOC sensors for air quality control of building ventilation systems