Greenhouse Evaporative Cooling System Design

Of air per square foot of cellulose pad material are common for greenhouses based on their system design.

Greenhouse evaporative cooling system design.

Typical fan and pad greenhouse arrangement. One of the most popular and efficient ways to cool large commercial greenhouses is with a wet wall system. The coolest area of the greenhouse is adjacent to the evaporative cooling pads. The evaporative cooling system.

The fan and pad system has been the standard system for evaporative cooling for more than 50 years. Morris 3 reported the greenhouse cooling potential by evaporative cooling through a simple equation. Evaporative cooling achieve and maintain cooler temperatures in your greenhouse in any climate with a cost effective evaporative cooling system. 4 presented a detailed treatment of the greenhouse evaporative cooling system.

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. A wet wall system consists of cooling pads encased in large aluminum housing. Roof evaporative cooling is another system where cooling is achieved by spraying water on the roof of the greenhouse. 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 most common way of accomplishing evaporative cooling in a greenhouse is with a fan and pad system figure 1. They are supplied with water from a pipe above the pads and excess water is collected in a gutter at the bottom. Open top design allows for easy detection and cleaning of. 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.

In this system aspen or cellulose pads are mounted in one endwall or sidewall of the greenhouse. The basis of any evaporative cooling system is the evaporation of water into an airstream. The two most common evaporative cooling systems used in greenhouses are wet wall systems and portable evaporative coolers. Check out our greenhouse cooling systems aluminum evaporative cooling systems.

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. It has been observed by various authors 5 7 that the temperature can be lowered by 6 8 c with evaporative cooling in greenhouses. Growers can also work with a greenhouse specialist to design a custom evaporative cooling system strong enough to manage temperatures on any scale. 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.

It should be clear that like many other greenhouse systems the design and control strategy for evaporative cooling systems requires some thought and attention.