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Ventilation in greenhouses

20/10/2023 An De Ridder

Ventilation is a crucial aspect of greenhouse management as it plays a vital role in maintaining the right environmental conditions for plant growth. Proper ventilation in greenhouses helps regulate temperature, humidity, and carbon dioxide levels, ensuring optimal conditions for plants.

Ventilation in greenhouses
Greenhouses can utilise natural ventilation methods, such as roof vents, side vents, and louvers, to control airflow. These openings allow warm air to rise and escape, while cooler air is drawn in through the sides or lower vents. This passive approach can be effective in moderating temperatures but may not be sufficient in extreme weather conditions.

In addition to natural ventilation, many greenhouses employ forced ventilation systems. These systems can help maintain consistent temperature and humidity levels, especially during hot or cold periods. Many modern greenhouses use automated control systems to monitor and adjust environmental conditions. These systems can be programmed to operate fans, vents, and other ventilation equipment based on pre-set parameters for temperature, humidity, and CO2 levels.

Maintaining the right temperature is crucial for plant health. Greenhouses can overheat during the day, especially in sunny conditions, and become too cold at night. Ventilation helps regulate temperature by allowing warm air to escape and cooler air to enter, preventing temperature extremes.

Humidity levels in a greenhouse affect plant transpiration, disease susceptibility, and overall plant health. Proper ventilation helps control humidity by removing excess moisture and maintaining the desired humidity range.

Adequate CO2 is essential for photosynthesis. Greenhouse ventilation ensures a sufficient supply of fresh air with CO2 to support plant growth.

Exhaust fans are commonly used in greenhouses to remove hot, stagnant air. These fans are usually placed near the roof or gable ends of the greenhouse to draw out warm air, ensuring proper air exchange. Some exhaust fans are equipped with automatic shutters to prevent the entry of pests or extreme weather conditions.

Appropriate distribution of air within the greenhouse is essential to ensure that all plants receive the same environmental conditions. Circulation fans used to even out temperature and humidity, as well as the forced air circulation inside, can affect the overall ventilation strategy. Proper airflow management helps prevent stagnation and ensures an optimal climate.

Correct ventilation is essential for creating a healthy and productive environment in a greenhouse. It helps prevent issues like mould, diseases, and excessive humidity, while also allowing for the efficient exchange of gases necessary for plant growth. The specific ventilation methods used will depend on the type of greenhouse, the crops being grown, and the local climate conditions. Greenhouse managers and growers continuously monitor these parameters and adjust ventilation systems accordingly. Properly managing these variables through ventilation is essential to create a controlled and favorable environment for optimal plant growth and crop production.

Sentera offers a large selection of sensors suitable for this kind of application. They come with a variety of power supplies and switchable output types to work with the majority of devices. Our intelligent sensors can even directly control EC fans or damper actuators. 

If your AC fan needs to be controlled based on temperature, use one of our temperature-based transformer fan speed controllers or variable fan speed controllers. If you want to be able to remotely monitor, log data, or change parameters, you can connect your sensor or controller to SenteraWeb, our online HVAC portal. This can be done by simply adding a Sentera internet gateway.

If you require stand-alone solutions that may be used or required repeatedly, please contact us. We can discuss your circumstances and determine whether to develop a specialised solution with specific firmware.
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