Reference 41Active recirculation ventilation
1. Flexible and customised solutions
Solutions specifically customised to your project and designed to ensure optimal air distribution
2. Efficient air distribution
The system has a high inductive outlet pattern that provides a good mixture of the injected air with the air that is already in the greenhouse.
Due to the position and our hole pattern, you obtain a lower temperature in the crop of the plant
3. Unique design
With this specifically developed duct for greenhouses we have found the right balance between the dynamic and static pressure.
This is why the air flow at the beginning and at the end of the duct is more uniform than in any other system
The duct system has a uniquely designed, patented and highly inductive outlet pattern. This unique outlet pattern ensures a very good
mixture of the injected air with the air that is already between the leaves and in the greenhouse
Entrainment is an undesired parallel airflow along the air distribution duct in the direction of the airflow, which is usually created in air
distribution ducts with only a normal hole pattern. Entrainment is a major cause of poor air distribution in greenhouses. Due to the slanted
outlet, there are high air speeds and a shortage of air at the beginning of the air distribution duct and an excess of air at the end
6. Less energy consumption
Due to the single duct concept and a balanced ratio between the selected ventilator and the air distribution duct, the power consumption of
the ventilator is considerably less, resulting in lower energy consumption or a larger quantity of air supply
The material is transparent or white polyethylene (PE) and is UV-stabilised [320 Kilo Langley per Year (KLY); 80 KLY is one year of UV in
the Netherlands]. The thickness of the material is 150 or 180 micron. It is produced in three layers, resulting in a material that can optimally
withstand cracking (breaking by continuous movements)
8. Easy to mount
An additional advantage of a single hose is the easy mounting: you have to mount only a single duct and that will save you time. You don’t
have to consider the second duct which will be inside the outer duct that can move with the installation. The weight is many times lower so
that you can install a lighter suspension construction. When replacing the ducts, you have to pay only half the amount of environmental tax
for transporting the discarded plastic
The GrowAir® solution is based on a patented system designed with holes in combination with flow controlling direction baffles. This will reduce the air flowing along the textile duct and ensure a uniform air distribution.
More even air distribution in the length and height of the duct
Lower overall pressure loss
Takes less time to install due to the GrowAir® duct patented pattern system, only requires one duct
The patented pattern in the GrowAir® system will be made in such a way that the entrainment problem seen on the Double Duct system will be balanced more out
More uneven air distribution in the length and height of the duct
Higher overall pressure loss due to the Double Duct system
Takes longer time to install due to the Double Duct system
Entrainment may occur in the first part of the system, leading to less air in the area where the ducts are connected to the fan
In the shown pilot there is a temperature and absolute humidity difference during the day. We have measured a difference of 6°C near the top of the plant between the Double Duct and the GrowAir® duct. At night the temperature and humidity is more uniform (1°C). Looking at the absolute humidity the GrowAir® duct creates a more homogenous distribution. Please note that in this pilot we have not changed the inlet conditions of the acclimatized air, so it is the same for the Double Duct and the GrowAir® duct.
The GrowAir® duct has over 120 meters a horizontal temperature difference of 1°C at the bottom and 2°C at the top of the plants The Double Duct has a horizontal temperature difference of 6°C at the bottom and 4.5°C at the top of the plants over 120 meters.
Due to the construction method of the GrowAir® duct system there is a higher static pressure available to force the air out of the holes. This has a significant influence on the air velocity and the potential possible reachable height for the air leaving the ducts
In this project the static pressure in the Double Duct after 65 m is 47 Pa at 70% Fan Speed, which is much lower than the GrowAir® system that has a static pressure left of 85 Pa at 65 metres at 70%
The temperature in the duct is equal for GrowAir® and Double Ducts, there is absolutely no isolation activity from the two polyethylene ducts that makes a double duct
The plenum connects the fan or air handling unit with the GrowAir duct.
The plenum connects the fan or air handling unit with the GrowAir duct and because of the air guidance blades you will have even less turbulence in the first meters of your duct.
This end cap need to be installed at the end of your duct. The holes will supply some air in the middle pad and haze a fixing point to adjust the duct to the gutter on the end.
This end cap need to be installed at the end of your duct. The adjustable holes will supply some air in the middle pad and haze a fixing point to adjust the duct to the gutter on the end.
To hang the duct under the total gutter we supply you a special suspension kit with syntactic hooks.
To connect the duct to the plenum and air handling unit/ventilator and end-cap you need these specific clamps.
In semi closed greenhouses it is common to use a corridor to mix the air to create optimal conditions. The air will be transported out of the corridor by a fan into a plenum and air distribution ducts. The fan and the air distribution system have to be in balance with each other to get an optimal working system for gaining optimal conditions to grow in. We can advise, select and supply you with a specially selected fan to reassure you a well-balanced system for an optimal homogenous air distribution in your (clients) greenhouse.
In semi closed greenhouses it is common to use a corridor to mix the air to create optimal air conditions. In some conditions it is advisable to extent your air distribution system and fan with a heat exchanger. We can advise, select and supply you with a specially selected heat exchanger to reassure you a well-balanced system for an optimal homogenous air distribution in your (clients) greenhouse.
In some situations creating a corridor is not possible or unwanted. For this situations the best air conditions will be created in an air handling unit/dehumidifier. Depending on the situation this unit is placed outside the greenhouse or inside it (and has a connection with the outside to get fresh air. We can advise, select and supply you with a specially selected air handling unit/dehumidifier to reassure you a well-balanced system for an optimal homogenous air distribution in your (clients) greenhouse.
If air need to be mixed in your greenhouses to create optimal conditions, we can provide you with this Ventilatorbox including a plenum and air distribution ducts. The fan and the air distribution system have to be in balance with each other to get an optimal working system for gaining optimal conditions to grow in. We can advise, select and supply you with a specially selected fan to reassure you a well-balanced system for an optimal homogenous air distribution in your (clients) greenhouse.
Reference 41Active recirculation ventilation
Reference 38Zea Mais research
Reference 37Den Magiske Fabrikken
Reference 36Vertical Farm 1
Reference 35Container climate conditioning
Reference 34Shelf climate conditioning
Reference 33Energy to Save Anthuriums
Reference 32Homogenous Climate
Reference 31Tom d’Aqui pilot
Reference 30Cooling Wasabi
Reference 29Les Jardins du Reunis
Reference 27Eletsk part 1
Reference 24Indoor Cultivation on the Highest Standards
Reference 23GROWx Vertical Farm
Reference 22Magnin 2
Reference 20Earl Du Chateau
Reference 19Enza Zaden
Reference 18Greenhouse nr 1.
Reference 16Incotec research & development
Reference 15Biobest Biological Systems
Reference 12Wageningen University & Research
Reference 11 Stolze Installatietechniek B.V.
Reference 10Windset Farms
Reference 9Earl Perez & Fils
Reference 8JMP Flowers
Reference 6Ter Laak
Reference 5 Tomunion
Reference 3Koppert Biological Systems
Reference 2JPL Provence
Reference 1Le Jardin de Rabelais