The study investigated performance of two commercially
available non-selective metal oxide semiconductor VOC sensors and two
commercially available non dispersive infrared CO2 sensors installed in one
person office. The office was equipped with demand controlled ventilation.
The signals from VOC and CO2 sensors, presence detection
sensor and supply/return air flow were logged. VOC and CO2 signals were in
agreement with respect to indicated need for mechanical ventilation for 49 % of
occupied time (81 % of whole measuring period).
VOC measurement would clearly trigger the mechanical
ventilation in contradiction with CO2 measurement in 11 % of occupied time.
Opposite situation was observed in 6 % of occupied time. In approx. 22 % of
occupied time CO2 signal has just reached the set-point while the VOC signal
was significantly below. In that case the ventilation start up would be
dependent on settings of a particular controller.
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