Pad and fan system : pad and fan system cools down greenhouse temperature, using evaporative cooling. The pads are installed on one side of the greenhouse, with the fans on the other side. These fans blow air from inside to outside, absorbing outdoor air through the pad. Thanks to the wet pads, dry outdoor air becomes colder and more humid, ideal for the growth of plants.
PAR light : radiation with a wavelength in the range from 400 to 700 nm that is used by photosynthetic organisms in the process of photosynthesis.
Polycarbonate : plastic film presenting in two forms : a single layer and a multi layer. Here are the different features of polycarbonate in multi layer:
-for 8 or 10mm of polycarbonate thickness, 1 air gap with a double layer are used
-for 16mm of polycarbonate width, 2 air gaps with a triple layer are used
-for 32mm of polycarbonate width, 3 air gaps with a fourfold layer are used
Relative humidity : percentage of the saturated/maximum water vapour content at the actual temperature. RH = (actual water vapour content) / (maximum water vapour content) x 100.
Semi-closed system : a corridor, located on the outer gable of the greenhouse, uses outside air for dehumidification and cooling. Thus, the corridor is used to mix inner air with external air. This system uses also air tubes below gutters bringing air from the corridor to the crop.
Sensible cooling : it is the process in which only the sensible heat of the air is removed so as to reduce its temperature, without any change in the moisture content of the air.
Sensible heat : it is the amount of heat exchanged, without any physical stage transition, between several bodies forming an isolated system.
Shade and open screen : with its highly reflective quality and open structure ideal for ventilation, shade and open screen shelters plants from sunlight, which makes it suitable for shading in hot climates or to manage more sensitive plants.
Solar radiation : radiation coming from the sun on an area in the range from 1 and 1400 W/m², depending on location and season.
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