Greenhouse Evaporative Cooling System Design

It has been observed by various authors 5 7 that the temperature can be lowered by 6 8 c with evaporative cooling in greenhouses.

Greenhouse evaporative cooling system design.

They are supplied with water from a pipe above the pads and excess water is collected in a gutter at the bottom. Evaporative cooling for greenhouses relates to the evaporation of water either by re circulating evaporative pad cooling systems or by high pressure fog systems or a combination of both. Evaporative cooling achieve and maintain cooler temperatures in your greenhouse in any climate with a cost effective evaporative cooling system. The new design of this system eliminates the need for a separate external sump tank and minimizes the amount of piping needed for the system while reducing annoying leaks.

The coolest area of the greenhouse is adjacent to the evaporative cooling pads. Here roof cooling is independent of the internal humidity level of the greenhouse and the inside air is sensibly cooled because of a colder roof. The most common way of accomplishing evaporative cooling in a greenhouse is with a fan and pad system figure 1. It should be clear that like many other greenhouse systems the design and control strategy for evaporative cooling systems requires some thought and attention.

Open top design allows for easy detection and cleaning of. The fan and pad system has been the standard system for evaporative cooling for more than 50 years. Growers can also work with a greenhouse specialist to design a custom evaporative cooling system strong enough to manage temperatures on any scale. In this system aspen or cellulose pads are mounted in one endwall or sidewall of the greenhouse.

The evaporative cooling system. Figures of 200 350 cu ft. Roof evaporative cooling is another system where cooling is achieved by spraying water on the roof of the greenhouse. The two most common evaporative cooling systems used in greenhouses are wet wall systems and portable evaporative coolers.

Morris 3 reported the greenhouse cooling potential by evaporative cooling through a simple equation. Of air per square foot of cellulose pad material are common for greenhouses based on their system design. The water evaporates taking heat from roof and cools the roof surface. A wet wall system consists of cooling pads encased in large aluminum housing.

One of the most popular and efficient ways to cool large commercial greenhouses is with a wet wall system. The basis of any evaporative cooling system is the evaporation of water into an airstream. Physical properties of air to use a psychrometric chart figure 1 to help determine the maximum temperature drop resulting from the operation of an evaporative cooling system it is. Typical fan and pad greenhouse arrangement.

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