On-line Monitoring of the Energy and Moisture Flows in Greenhouses

As the size of greenhouses in the Netherlands is increasing more and more, the on-line monitoring of certain, not directly measured, climate quantities and crop properties becomes important for good management of the greenhouse production system. For the ventilation rate, the crop evaporation and the air exchange through screens several monitors are developed, which calculates these quantities on-line from standard climate measurements. The design, implementation and performance in practice of the proposed methods will be shown.