If you want a good harvest, you need ideal conditions for the plants to grow. As such, it is crucial to ensure uniform climatic conditions and optimal support for plant photosynthesis throughout the entire greenhouse. There are two ways to achieve this, which can be used together if required: horizontal ventilation to circulate the air above the plants, and tube ventilation from below to supply conditioned air.

An all-round talent based on refrigeration technology
AxiCool axial fans from ebm-papst are used for the horizontal air circulation system – products that were originally designed for use in refrigeration technology. Due to their guide vanes, the fans feature high air throw and enable precise control of the air flow. The fans are mounted on routes in the greenhouse at defined intervals. The housing is white so as to reflect as much sunlight as possible. In order to meet service life requirements, the AxiCool fans have been specifically equipped for use in very humid greenhouses. The plastic components are made from UV-resistant material, which is also easy to clean.

A true innovation: ventilation from below
A particularly innovative method is the use of ventilation tubes from below. Energy-efficient, high-pressure centrifugal or axial fans from ebm-papst are used to implement this solution. The usually conditioned air is supplied using a perforated tube. This tube is positioned below the plants, thereby providing an optimal supply of CO2 to the undersides of the leaves. The axial fans draw in air from the greenhouse’s air preparation room and force it into the tube and through the holes past the plants toward the ceiling, where it is then directed back into the intake air flow. The result is a defined circuit of air flow. The fans' excellent performance allows for particularly long tubes, which can be used in large greenhouse installations, for example.

Energy saving made easy
The fans for both methods are powered by energy-saving EC motors. The efficiency of these motors far exceeds the requirements of efficiency class IE4. With this solution, ebm-papst is further expanding the potential applications of its EC technology.