Temperature is the driving force for plant growth. In winter and spring, due to the low temperature and lack of light, it will cause freezing hazards and insufficient photosynthesis in greenhouse fruits and vegetables. To this end, the following introduction describes three commonly used temperature-increasing equipment, can increase the average greenhouse temperature by about 3°C, thereby increasing the winter utilization rate of solar greenhouses, achieving the goal of “high efficiency and low consumptionâ€, and complying with the goal of low carbon and environmental protection. It is required to ensure the safe wintering production of fruits and vegetables, saving medicine, saving water and energy, and improving the quality of vegetables and the quality of production.
First, solar greenhouse water cycle heat storage system
Solar greenhouse water circulation heat storage system consists of heat absorption and water circulation system. Suction heat treatment is to attach or brush a special heat-absorbing material on the back wall of a solar greenhouse, wrap it around the radiator with a plastic film, convert the solar energy into hot air, and heat the water inside the radiator. Heat it up. The water circulation system is the warm water in the radiator, which can be circulated by the water pump. The thermostatic water tank at one end of the radiator can store the warm water. The endothermic material absorbs sunlight energy and raises the temperature of the rear wall. After the wall absorbs heat, the greenhouse is heated and heated at night. The heated warm water is sent to the solar greenhouse radiator at night through a circulating pump to heat the plant growth environment, while the warm water can replace the winter cold water to meet the water needed for crop growth.
Second, solar greenhouse back wall insulation system
After the sun rises in winter morning, the temperature and humidity in the solar greenhouse gradually rise. When the temperature exceeds the optimum temperature for the growth of crops in the greenhouse, a high-temperature and high-humidity environment is formed, which is not suitable for the growth of crops. The plant manager must open the uptake of the greenhouse. The “air release†is carried out to ensure the normal temperature required for the growth of crops, that is, to release excess heat to cool down, discharge excess moisture, reduce humidity, and provide sufficient carbon dioxide concentration. In the high-temperature and high-humidity environment before “dischargingâ€, germs are easy to spread and breed, and taking measures to reduce humidity is not conducive to the growth of crops. The contradiction between temperature and humidity cannot be solved for a long time; in the rear wall insulation system after “dischargingâ€, heat cannot be timely Heat storage, the space between double insulation walls can not add the required heat, forming a "hollow cold bridge" phenomenon.
The solar greenhouse back wall insulation system can be installed on the back wall without opening the upper air outlet of the greenhouse. Fans will be used to evenly transfer the excess heat in the greenhouse to the gap in the back wall of the solar greenhouse, and the remaining heat will be transferred through the fan. Stored in a well-preserved thermal chamber, through the effective use of the excess heat in the solar greenhouse, through heat conduction and exchange, to ensure the efficient use of solar energy after conversion, to provide a good growth environment for greenhouse crops.
Third, intelligent ventilation temperature heating system
The intelligent ventilation and ground heating system introduces excess hot air in the greenhouse during the day into the cultivated soil through fans, buried pipes and other devices. It uses the soil to accumulate heat during the day and at night, it extracts the heat accumulated in the soil and sends it to the greenhouse to increase the greenhouse temperature. Air temperature.
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