Different crowns have different degrees of curvature, and the size of the air outlet is different. The size of the spring tuyere cannot be completely defined by a certain data. Because the structure of the greenhouse is different, the time and speed of cooling are also different. In a greenhouse with a large crown, because of the suitable crowning, the hot air flow is easily discharged along the upper part of the greenhouse shed. Even if the outlet is small, a good air release effect can be achieved. In addition, the low sheds with longer planting years have higher temperatures in the shed because of the smaller arches.
The wind direction varies with different directions. The size of the air outlets on the two sides of the greenhouse is different. When the western wind blows, the vegetables on the west side of the greenhouse are blocked by the gables. The heat discharged from the shed is relatively small and the temperature is high. Care should be taken to increase the outlet on the west side of the greenhouse and reduce the outlet on the east side.
Partition ventilation should pay attention to sub-ventilation in the spring. After opening the shed for 1 hour in the morning, open the air outlet and put a small wind around 3-5 centimeters to remove moisture from the shed while supplementing the carbon dioxide in the shed. Photosynthesis Smoothly supplemented raw materials. When the shelf temperature rises above 28°C, the air outlet shall be gradually opened, and the temperature within the shelf may not exceed 33°C.
The wind is windy and windy. There are many winds in spring and spring. Pay attention to wind protection at the air outlet and increase the density of the air release rope. It is better to use a wide cloth with large friction. This kind of cloth has a friction force when you hit the knot and fix the film. Large, slipknot is not easily blown loose by the wind.
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