A poorly maintained system may not provide sufficient cooling or could result in wetting of leaves and fruit. Fogging systems produce very small droplets of water in the range of 10-20 microns which are suspended in the air and evaporate before they have time to fall on to the crop canopy.įogging line pressure and fogging nozzles need to be properly maintained. On a hot day, a cooling effect of up to 10 oC can be achieved.
![cooling pad system greenhouse cooling pad system greenhouse](https://img.alicdn.com/imgextra/i4/6000000002688/O1CN01sjRsDH1Vj97CRqtGt_!!6000000002688-0-tbvideo.jpg)
Fogging systemsįogging systems are a fairly effective and uniform method of greenhouse cooling and provide a reasonable increase in relative humidity in a greenhouse. Under extreme conditions which demand a lot of cooling, the air movement through the greenhouse generated by exhaust fans may damage plants. A disadvantage of the fan and pad system is that it tends to create a significant temperature gradient from one end of the greenhouse to the other (warmest at the fan end and coolest at the pad end) which can affect crop uniformity and make management more difficult.
Cooling pad system greenhouse install#
These systems are quite effective for cooling but are relatively expensive to install and maintain. As a result, cool air is drawn into the greenhouse to replace the hot air expelled by the fan. The air, passing through and over the wet pad evaporates some of the water and is cooled. When the fan is in operation, it pulls air from outside the structure, through the evaporative pad, into the greenhouse.
![cooling pad system greenhouse cooling pad system greenhouse](http://agratech.com/cms/upload/menu/gallery/80/agra-tech-commercial-greenhouse-accessories-cooling-pad-mt.jpg)
A pump circulates water over and through the pad. An exhaust fan is located at one end of the greenhouse and a porous pad is built into the wall of the structure at the opposite end. Fan and pad systems combine two pieces of equipment.