An alternate system uses a fog or great mist injected into the intake air stream. Although many commercial systems are available, growers can assemble and install their own system utilizing a high pressure piston pump and fog nozzles. The essential components are proven in Fig. 1. A two-stage system managed by a two- stage thermostat enables more water to be employed on excessively warm, shiny days. Temperature settings ought to be 5-10°F apart.
Algae growth in the pads can become a problem that will reduce the effectiveness of the system and result in accelerated deterioration of the pads. The addition of an algaecide to the drinking water supply can help in control.
It is desirable, especially in hard water areas, to add a wetting agent to the drinking water to obtain more uniform wetting of the pads. A commercial material or liquid household detergent at the rate of 2 tablespoons per 100 gallons may be used.
Water for the pads ought to be clean and lower in mineral content to avoid clogging and coating of the pads. A pump, pipes and gutters are used to recirculate the drinking 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 coolant system (fan and pad), the fans draw air through wet pads that extend the length of 1 endwall or sidewall. Aspen and coated cellulose are common pad materials that always have life of 1 to three years. Approximately one sq . foot of pad are is necessary for 20 square feet of floor area.
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