A decipol predictive controller for VAV systems.

Due to the lack of proper sensors for odours, the odour concept, involving the unitsolf and decipol, is of very little practical use with respect to automatic control of VAVsystems. However, the decipol level in a room may be predicted from the concentration ofCO2 and the amount of fresh air supplied. By using the CO2 level as a decisive variable ofthe occupant load within the room, the actual air quality (decipol level) can be predicted.Once the decipol level is known, it is compared to a given set point, thus enabling thecontroller to alter the air flow rate accordingly. Eventually the room air quality shouldbecome equal to the specified set point. In this study, such a demand controlled ventilationalgorithm is presented. The performance of the controller is visualized by simulation, andthe results show that the approach to control the decipol level based on measurements ofthe CO2 level could be advantageous compared to commercial CO2 control.