The role of greenhouse vents is ventilation. Ventilation and ventilation are an important management measure in greenhouse production. Through ventilation, it is possible to regulate the temperature in the greenhouse, supplement the carbon dioxide in the greenhouse, and discharge the water vapor, reducing the humidity in the greenhouse. In addition, ventilation can be used to vent harmful gases in the greenhouse.
The greenhouse vents are set in different ways. There are windows that are ventilated at regular intervals on the back wall, and there are also openings on the front of the roof for ventilation. The currently used sunroof greenhouse vents are quilted vents, that is, two rows of vents are provided on the front roof. The upper row is located near the ridge and has strong exhaust capacity. It mainly discharges hot and humid air. The lower row is located at a height of about 1 meter above the ground in the front roof and is mainly used for air intake. If the setting is too high, the air exchange effect will be affected, and if it is too low, the cold air will be directly rushed into the greenhouse and “sweeping wind†will appear. Affecting the growth of peach trees, severe cold damage or cold injury. Therefore, it is very important to grasp the proper height of the lower vents. The upper and lower rows of ventilation doors are formed by overlapping the upper three layers of the upper, middle and lower films according to the height requirements. The overlapping films are overlapped by 20-30 cm, and the upper film presses the middle film and the middle film presses. Under the film, there is no gap between the two films at ordinary times. If it is necessary to vent the air, it will be split upwards from the two film seams and become a ventilation channel. The ventilation volume can be adjusted by the quilting width. The shed film is not easy to damage, the ventilation operation speed is high, and the ventilation and air exchange effect is good.
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