In the 3-way system the central control system decides whether to guide the roof air directly into the haystack or whether it needs to be dehumidified first of all by means of the air dehumidifier (#2).
Therefore, with this system roof extraction can be used even more effectively.
In this process the decision, as to which airway is the most efficient, is taken by the SPS control system by means of the HX diagram. It is not only the temperature and humidity of the roof air that is significant; the storage capacity of the air in the roof is of prime importance.
Air flow #1: recirculating air with dehumidifier
Air flow #2: roof fan with dehumidifier
Air flow #3: roof fan without dehumidifier