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 using 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 allows more water to be employed on excessively warm, bright days. Temperature settings ought to be 5-10°F apart.

Algae development in the pads can become a problem which will decrease the effectiveness of the system and lead to accelerated deterioration of the pads. The addition of an algaecide to the water supply can help in control.

It is desirable, especially in hard drinking water areas, to add a wetting agent to the drinking water to obtain more uniform wetting of the pads. A commercial materials or liquid home detergent at the price of 2 tablespoons per 100 gallons may be used.

Water for the pads should 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 water. A flow rate 113 gallon per minute per linear foot of pad program should be provided to ensure adequate wetting.

In the most typical coolant system (fan and pad), the fans draw air through wet pads that lengthen the length of 1 endwall or sidewall. Aspen and covered cellulose are common pad materials that always have life of 1 to three years. Approximately one square foot of pad are is needed for 20 square feet of floor area.

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