Fan And Pad Cooling System In Greenhouse

Several evaporative cooling systems work well in commercial greenhouses.

Fan and pad cooling system in greenhouse.

The pad system is normally installed continuously along the side or end of the wall opposite the fans. Water flows along the distribution pipe and drains down into the pad material. The most commonly used evaporative cooling system used in greenhouses is the fan and pad evaporative cooling system see figures 5 5 and 5 6. Two evaporative cooling systems are commonly used in greenhouses.

Fan and pad systems consist of exhaust fans at one end of the greenhouse and a pump circulating water through and over a porous pad figure 2 installed at the opposite end of the greenhouse. The 4 or 6 inch thick pad is treated with anti rot salts stiffening and wetting agents. Cooling pads cool by creating large amounts of surface area that are exposed to air being drawn into the greenhouse by exhaust fans. It contains a cellulose pad overhead water supply pipe gutter to collect excess water a sump tank pump piping and control.

This technique utilizes the cooling effect produced when water evaporates and cools the air as it is pulled through the pad. A fan and pad system uses exhaust fans to pull air through evaporative cooling pads. They are supplied with water from a pipe above the pads and excess water is collected in a gutter at the bottom. With this type of system exhaust fans are placed in one wall of the greenhouse and pads are in the opposite wall.

Note that swamp coolers can be considered stand alone evaporative cooling systems but otherwise operate similarly as pad and fan systems. In this system aspen or cellulose pads are mounted in one endwall or sidewall of the greenhouse. Fan and pad evaporative cooling systems. The fan and pad system has been the standard system for evaporative cooling for more than 50 years.