Greenhouse Auto Vent

An alternate system uses a fog or great 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 essential components are proven in Fig. 1. A two-stage system managed by a two- stage thermostat allows more water to be applied on excessively warm, bright days. Temperature settings ought to be 5-10°F apart.

Algae development in the pads can become a problem that will reduce 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 drinking water areas, to include a wetting agent to the drinking water to obtain additional uniform wetting of the pads. A commercial materials or liquid home 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 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 should be provided to guarantee adequate wetting.

In the most typical coolant system (fan and pad), the fans draw air through wet pads that prolong the length of one endwall or sidewall. Aspen and covered cellulose are normal pad materials that always have life of 1 to 3 years. Approximately one square foot of pad are is necessary for 20 square feet of floor area.

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