An alternate system runs on the fog or great mist injected in to the intake air stream. Although a number of commercial systems are available, growers can assemble and set up their own system using a high pressure piston pump and fog nozzles. The basic components are shown 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 should be 5-10°F apart.
Algae growth in the pads may become a problem that may decrease the effectiveness of the system and result in accelerated deterioration of the pads. The addition of an algaecide to the drinking water supply will help in control.
It is desirable, especially in hard drinking water areas, to include a wetting agent to the water to obtain additional uniform wetting of the pads. A commercial materials or liquid household detergent at the price of 2 tablespoons per 100 gallons may be used.
Drinking water for the pads should be clean and low in mineral content to avoid clogging and coating of the pads. A pump, pipes and gutters are accustomed to recirculate the drinking water. A flow rate 113 gallon each and every minute per linear foot of pad system should be provided to assure adequate wetting.
In the most common cooling 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 normal pad materials that always have life of one to 3 years. Approximately one square foot of pad are is necessary for 20 square foot of floor area.
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