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• 1. Close the windows
• 2. Close the screens
• 3. More energy saving

The lower outdoor temperatures result in higher relative humidity outside. Ventilation and heating for humidity management is barely reliable. By closing the windows and screens during colder and damper parts of the day (night, cloudy or rainy days), the greenhouse is insulated and isolated from the outside conditions. In this way, DryGair ensures that the humidity in the greenhouse remains at the set target level.

Screens help to prevent condensation drops. Due to the physical properties of air, even at low indoor relative humidity, the colder surfaces in the greenhouse, such as the roof and metal structures, can reach the dew point. Subsequently, condensation will be formed. Closing the screens creates a physical barrier between condensation drops from the roof and the plants. This protects them from getting wet, while the heat energy stays inside. By keeping the plants dry, the chance of moisture-related plant diseases is drastically reduced.

Closing the windows and screens helps keep the heat inside the greenhouse. In this way, you do not have to heat as much as if you relied on ventilation for humidity control. The result: major energy savings. In addition, the electrical energy used by each DryGair unit is converted into heat energy. Because of this, the temperature increases and the heating requirement in the greenhouse reduces even further.

Note: Do you not have an effective heating system? You can upgrade a standard DryGair unit  with a heating and cooling function to easily provide the heating in your greenhouse.  

Longer nights mean more operating hours for the DryGair unit. Both bright mornings as sunsets are times when the relative humidity in the greenhouse naturally rises. To avoid high indoor humidity, we recommend extending the operating hours of the DryGair. Not only with the night, but also the morning and evening hours when the radiation is low. This provides an active dehumidification impulse to the indoor climate, even when windows and screens are closed. It also prevents moisture peaks during those transitional hours.

Are you working with supplemental lighting? Remember that plant evaporation is the balance between factors such as radiation, temperature and humidity. Plant evaporate much more when exposed to radiation and higher temperatures. Therefore, in some cases, DryGair will be combined with open windows and screens to help control excess moisture. 

  

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How to create climate equality in the greenhouse?
An important factor for obtaining a uniform crop and harvest result is the creation of climate equality. This means that a situation is aimed for in which the temperature and the humidity show as little difference as possible at different locations in the greenhouse.

How do you prevent excessive moisture in a greenhouse?
A humid climate with excessive moisture leads to various cultivation problems, such as inequality and the onset of diseases in you crop. Therefore it’s important to control the moisture by dehumidifying.

What is ‘Next Generation Growing’?
The “Next Generation Growing” is a new growing method in which new insights for greenhouse climate control and a change in the behavior of the grower lead to an optimal cultivation result in a (semi) closed greenhouse, with the side effect of saving energy.