Polycarbonate greenhouses can ensure good ventilation through the following methods:

Natural ventilation design

Set ventilation openings: Install ventilation openings at the top and sides of the greenhouse. The top ventilation opening is conducive to the discharge of hot air, as it naturally rises and can effectively remove heat when discharged from the top; Side vents can promote air circulation and allow fresh air to enter the greenhouse. Large scale production polycarbonate greenhouses are mostly double slope connected greenhouses, often equipped with ventilation windows on the side walls and ridges. When the ridge ventilation windows are fully opened, they form a large angle with the horizontal plane, such as 100 °, which can achieve good ventilation effect.

Optimize the size and quantity of ventilation openings: Reasonably determine the size and quantity of ventilation openings based on the area of the greenhouse, the type of crops planted, and local climate conditions. For crops with large areas or high ventilation requirements, large and numerous ventilation openings are needed; Ventilation openings in hot areas should also be larger and more numerous to ensure sufficient ventilation.

Consider the location of the ventilation opening: The position of the ventilation opening should be conducive to the formation of cross ventilation, allowing air to flow evenly within the greenhouse. For example, setting ventilation openings on the opposite sides to allow air to enter from one side and flow out from the other side, avoiding blind spots in ventilation. Meanwhile, avoid setting ventilation openings in areas that are prone to vortex formation, such as corners of greenhouses or near obstacles.

Installing insect proof nets: Installing insect proof nets at ventilation openings can prevent pests from entering the greenhouse without affecting ventilation effectiveness. Choose a suitable mesh size for insect prevention. A mesh size that is too high will affect ventilation, while a mesh size that is too low will result in poor insect prevention effectiveness.

Mechanical ventilation assistance

Install fans: When natural ventilation cannot meet the ventilation needs of the greenhouse, such as in hot summer weather, mechanical ventilation can be used. Install exhaust fans on greenhouse walls or roofs to force air flow, accelerate air exchange between inside and outside the greenhouse, and achieve the purpose of cooling and ventilation. Select fans of appropriate power and quantity based on the size of the greenhouse and ventilation requirements.

Install circulating fans: Install circulating fans inside the greenhouse to promote indoor air circulation, evenly distribute temperature and humidity inside the room, and avoid high temperatures, high humidity, or poor air circulation in local areas. Circulating fans can also prevent the accumulation of moisture on the surface of crop leaves, reducing the likelihood of disease occurrence.

Intelligent ventilation control

Installation of environmental monitoring equipment: Install temperature, humidity, carbon dioxide concentration and other sensors in the greenhouse to monitor indoor environmental parameters in real time. Automatically control the opening degree of ventilation openings or the operation of fans based on crop growth requirements and set thresholds.

Intelligent control system: the intelligent control system can predict the change of the indoor environment and adjust the ventilation strategy in advance according to the data collected by the sensor, combined with the weather forecast and historical data. For example, before the arrival of hot weather, automatically increase the ventilation volume and lower the indoor temperature.

Optimization of greenhouse structure

Choose the appropriate type of greenhouse, such as a tall Wenluo style greenhouse. The higher space helps to keep hot air away from crops, and the air volume is larger, resulting in slower temperature changes. At the same time, it is convenient to hang equipment such as fans and curtain systems, which is beneficial for ventilation and environmental regulation.

Ensure reasonable structure: The structural design of the greenhouse should be reasonable to avoid structural layouts that obstruct air circulation. For example, the arrangement of structural components such as columns and purlins should minimize obstruction to air flow, ensuring that air can flow smoothly inside the greenhouse.