Cooling and Wetting Systems
Cooling a greenhouse is more expensive than heating a greenhouse. An investment in a cooling system must therefore be a well considered decision. The preferred cooling method for a greenhouse is through evaporative cooling. Evaporative cooling is the process of having particles of water evaporate, which leads to a drop in temperature through increased humidity. There are two systems which use this principle in commercial greenhouses: high pressure fogging and the Pad & Fan cooling system. In the few years, semi-closed greenhouses have been developed based on the same principles as the Pad & Fan system.
During summer periods, high-temperature values that are being formed in greenhouses can greatly influence the efficiency of production and also decrease the productivity of plants grown there. A greenhouse production without the cooling systems can be sustained at the desirable level by imposing summer restrictions in the areas with a warm climate, and by starting cooling in the areas with cold climates. A statement can be made regarding both the utility and efficiency of fan-pad cooling systems that tend to go up in areas with low relative air humidity. We have attempted to create a map of internal greenhouse temperature distribution by determining the system’s efficiency.