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While fogging and pad and fan cooling operate on the same principle, fogging can provide some advantages over pad and fan, such as: more uniform cooling can be achieved over the greenhouse area, and simpler greenhouse designs, or retro-fitting are possible with fogging, unlike pad and fan greenhouses. However, the main challenge is that if the quality of water used for fogging is not maintained, it could easily lead to clogging of the nozzles with particulate matter or calcium deposits.
Contribution to energy balance and resource use of greenhouses:
The evaporative cooling acting in fogging systems reduces the greenhouse temperature, and can be used to regulate humidity.
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The compression pumps which generate the high-pressure droplet spray require electricity.
Possible steps towards sustainable, energy-efficient greenhouses
The energy supply for the compressors, and possibly for the water purification, can be derived from renewable resources.
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