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Greenhouse Auto Vent

An alternate system uses a fog or good mist injected in to 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 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, shiny days. Temperature settings ought to be 5-10°F apart.

Algae development in the pads may become a problem that may reduce the effectiveness of the machine 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 drinking 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 may be used.

Water for the pads ought to 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 drinking water. A flow rate 113 gallon each and every minute per linear foot of pad system ought to be provided to make certain adequate wetting.

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

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