In different greenhouses, at the same time, the vents are open to the same size. Will the temperature in the shed be the same? the answer is negative. However, many vegetable farmers only pay attention to the size of the vent when they ventilate, but they ignore the difference in the structure of the shed.
Due to the different heights and crowns of greenhouses, the changes in airflow during ventilation are different, and the effect of ventilation and cooling is also very different. In smaller sheds, the hot air in the shed is not discharged through the top vents, so even if the top vents are opened to the maximum, the cooling capacity is limited. That is to say, under the same weather conditions, a high-height, high-arched greenhouse can be cooled by lowering the temperature of the roof by opening the ceiling by 40 centimeters in width; the smaller canopy, even with the top vents, can be cooled. Increasing it to 60 cm wide does not necessarily reduce the temperature to the same level. Therefore, when the vegetable farmer is ventilating, the size of the air vent should be properly adjusted according to the temperature in the shed, instead of judging the temperature in the shed by the size of the air vent. The vegetable farmer should set 2 to 4 thermometers in each greenhouse to adjust the size of the vents according to the temperature inside the greenhouse. Only open the top vents, when the temperature drop in the shed can not be down, the ventilation openings in the front of the greenhouse should be opened in time, through the hallway to enhance the air circulation inside the shed to reduce the temperature inside the shed.
Of course, for vegetables with lower light requirements, the temperature in the shed can be further reduced by splashing mud on the shed film or covering the shade net. However, it should be noted that when covering the shade net, the vent should not be covered so as to prevent the hot air inside the shed from being discharged and affect the cooling effect.
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