How to ventilate greenhouses more effectively is very important, especially for greenhouses in southern my country. The energy consumption of production is mainly consumed in cooling in summer. Therefore, choosing and optimizing the ventilation plan is to reduce the operating cost of greenhouses and increase the economic benefits of greenhouse operations. key.
Natural ventilation
The natural ventilation of the greenhouse is to use the wind pressure and heat pressure formed by the temperature difference between the inside and outside of the greenhouse to exchange the hot and cold air inside and outside the greenhouse, so as to achieve the goal of cooling in the greenhouse. It does not require ventilation and exhaust mechanical equipment required for mechanical ventilation, so it also saves operating costs. Therefore, when conditions permit, it should be used first.
A good ventilation system should meet the following requirements: good ventilation capacity, reasonable indoor air distribution, and the ventilation system can easily adjust the ventilation volume. The ventilation capacity is reflected in the size of the ventilation power and the size of the ventilation area. For natural ventilation, it is required to arrange the air inlet and outlet of the greenhouse at the lowest and highest point of the greenhouse respectively, which can increase the thermal pressure difference and increase the driving force of ventilation.
Mechanical ventilation
For the mechanical ventilation of the greenhouse, the choice of high-power fans and double forced ventilation of intake and exhaust can increase the ventilation volume. The ventilation area is actually the area of the ventilation window. The larger the area, the better the ventilation effect. But with a large area, the cost and operating cost of the window opening mechanism have also increased. In addition, the ventilation window should be set as far as possible so that the airflow direction of the wind pressure ventilation and the heat pressure ventilation is the same, for example, the skylight exhaust direction is in the downwind direction of the local prevailing wind direction.
