An alternate system uses a fog or fine mist injected in to the intake air stream. Although several commercial systems are available, growers can assemble and set up their own system utilizing a ruthless piston pump and fog nozzles. The basic components are demonstrated in Fig. 1. A two-stage system controlled by a two- stage thermostat enables more water to be employed on excessively warm, bright days. Temperature settings should be 5-10°F apart.
Algae growth in the pads can become a problem that may decrease the effectiveness of the machine and result in accelerated deterioration of the pads. The addition of an algaecide to the water supply will help in control.
It really is desirable, especially in hard water areas, to include a wetting agent to the water to obtain additional uniform wetting of the pads. A commercial material or liquid household detergent at the rate of 2 tablespoons per 100 gallons can be used.
Water for the pads should be clean and lower in mineral content to prevent clogging and coating of the pads. A pump, pipes and gutters are used to recirculate the water. A flow rate 113 gallon per minute per linear foot of pad system should be provided to assure adequate wetting.
In the most typical cooling system (fan and pad), the fans draw air through wet pads that extend the length of one endwall or sidewall. Aspen and coated cellulose are common pad materials that usually have life of one to three years. Approximately one sq . foot of pad are is needed for 20 square feet of floor area.
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