Greenhouse Evaporative Cooling System Design

Typical fan and pad greenhouse arrangement.

Greenhouse evaporative cooling system design. Roof evaporative cooling is another system where cooling is achieved by spraying water on the roof of the greenhouse. In this system aspen or cellulose pads are mounted in one endwall or sidewall of the greenhouse. Designed with the grower in mind these cooling pads and systems will use heat in the air to evaporate water from plants and other wetted surfaces that will then cool your structure. 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.

Check out our greenhouse cooling systems aluminum evaporative cooling systems. It has been observed by various authors 5 7 that the temperature can be lowered by 6 8 c with evaporative cooling in greenhouses. The two most common evaporative cooling systems used in greenhouses are wet wall systems and portable evaporative coolers. Evaporative cooling achieve and maintain cooler temperatures in your greenhouse in any climate with a cost effective evaporative cooling system.

It should be clear that like many other greenhouse systems the design and control strategy for evaporative cooling systems requires some thought and attention. The water evaporates taking heat from roof and cools the roof surface. Open top design allows for easy detection and cleaning of. 4 presented a detailed treatment of the greenhouse evaporative cooling system.

A wet wall system consists of cooling pads encased in large aluminum housing. 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. They are supplied with water from a pipe above the pads and excess water is collected in a gutter at the bottom. With multiple designs and sizes for both greenhouse swamp coolers and evaporative cooling walls available growers can find the right equipment for their operation no matter the requirements.

The basis of any evaporative cooling system is the evaporation of water into an airstream. 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. Morris 3 reported the greenhouse cooling potential by evaporative cooling through a simple equation. The coolest area of the greenhouse is adjacent to the evaporative cooling pads.

Of air per square foot of cellulose pad material are common for greenhouses based on their system design. The fan and pad system has been the standard system for evaporative cooling for more than 50 years. The most common way of accomplishing evaporative cooling in a greenhouse is with a fan and pad system figure 1. One of the most popular and efficient ways to cool large commercial greenhouses is with a wet wall system.

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.