Greenhouse windowing, ventilation, and cooling system: Greenhouse ventilation is the process of exchanging the air inside the greenhouse with the outdoor air, with the purpose of regulating the temperature, humidity, carbon dioxide concentration and removing harmful gases in the greenhouse to meet the requirements of normal growth of indoor cultivated plants . Greenhouse ventilation occupies an important position in greenhouse design, and it is a measure that must be taken in the regulation of the greenhouse production environment. There are two ventilation methods for modern multi-span greenhouses: natural ventilation and fan ventilation.
The natural ventilation of the multi-span greenhouse mainly relies on the window opening system. Window opening system refers to the equipment system that uses electricity or manpower in the greenhouse to open and close the top window or side window of the greenhouse through the window drive mechanism. The commonly used window opening systems in modern multi-span greenhouses are gear and rack window opening systems and film roll window opening systems driven by electricity.
Smart greenhouses are also called automated greenhouses. They are equipped with computer-controlled movable skylights, sunshade systems, heat preservation, wet curtains/fan cooling systems, sprinkler irrigation systems or drip irrigation systems, mobile seedbeds and other automated facilities, based on the agricultural greenhouse environment. High-tech "smart" greenhouse. The control of the intelligent greenhouse generally consists of three parts: a signal acquisition system, a central computer, and a control system.
The "central system" of the intelligent greenhouse is the intelligent greenhouse monitoring system. It is composed of sensors, automated control systems, communications, computer technology and expert systems. By pre-installing suitable environmental parameters required for the growth of a variety of crops, it builds an intelligent soft and hard platform for greenhouses to achieve control of the temperature, humidity, light, and temperature in the greenhouse. Automatic monitoring and control of factors such as carbon dioxide and nutrient solution.
Factors such as temperature, humidity, light intensity, soil temperature and water content in the greenhouse play a key role in the growth of greenhouse crops. The greenhouse automation control system is based on PLC, and uses a computer distributed network control structure to control the air temperature, soil temperature, relative humidity, CO2 concentration, soil moisture, light intensity, water flow, PH value, EC value and other parameters in the greenhouse. Real-time automatic adjustment and detection create the best environment for plant growth and make the environment in the greenhouse close to the ideal value artificially envisaged to meet the needs of greenhouse crop growth and development. It is suitable for seedling breeding, high-yield planting, rare and precious flower cultivation and other places to increase the output of greenhouse products and increase labor productivity. It is a successful example of modern agriculture with high-tech achievements serving large-scale production.
The computer operator inputs the data and control parameters required by the crops to the computer, and the system can realize unmanned automatic operation. The data collected by the computer can be accurately displayed and counted, providing a reliable basis for expert decision-making. The control cabinet is equipped with a manual/automatic switch, and manual control operation can be carried out when necessary.
