Abstract
Forced ventilation has more accuracy in climate control of agricultural greenhouses. It is worthwhile to apply some energy saving measures to overcome the disadvantage of high power consumption in fan driving of forced ventilation. Here we present a new developed controller based on PLC which mainly can control the ventilation fans rotation speed in combination with variable frequency drive except for manipulating other facilities in greenhouse like pad, shading screen etc. The control system integrates a sense module which measuring solar radiation, temperature and humidity inside and outside of greenhouse, an actuating module which includes variable frequency drive, pad control and radiation screens to perform a optimized cooling strategy to reduce electrical energy consumption by low down the fans rotation speed with ambient condition changes.
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