Beijing Association Showcases China Green Agro's Modern Greenhouse Initiative
As the Chinese proverb says, "The year's plan starts with spring," the Central No.1 Document clearly advocates for the construction of an agricultural powerhouse and the acceleration of "developing modern facility agriculture." Recently, the Beijing Greenhouse Industry Association, in cooperation with the Beijing Agricultural Technology Extension Station, organized an observational meeting at the national modern agricultural technology demonstration park in Xiaotangshan's East District. The event was hosted at a domestically produced intelligent glass greenhouse project constructed by China Green Agro.
Secretary-General Zhang Zhixia of the Beijing Greenhouse Industry Association and Lei Xihong, head of the Beijing Agricultural Technology Extension Station's facility agriculture department, along with representatives from over 50 member units, participated in the event. Guo Wenzhong, a researcher at the Beijing Academy of Agriculture and Forestry Sciences' Intelligent Equipment Technology Research Center, conducted a live explanation for the attendees. He shared insights on greenhouse design schemes, the development foundation and trend of facility structures, the differences between sunlight greenhouses and glass greenhouses, energy-saving design and exploration of low-energy consumption glass greenhouses, and the arrangement of equipment. This allowed participants to gain a better understanding of the key energy-saving and emission reduction technologies, intelligent technologies, and their effectiveness in facility production.
The large slope exterior insulated multi-span glass greenhouse is an innovative development in China, embodying the design of a "large slope, external insulation" multi-span greenhouse. A successful case of its application is the construction of an 8.8-hectare intelligent large slope exterior insulated multi-span glass greenhouse in Shouguang, Shandong. Actual operational validation has shown that this greenhouse can significantly reduce the production energy consumption, labor costs, and other operational costs. It has good promotion effects and is a suitable new type of greenhouse facility for corporate operation.
Drawing from the features of Dutch greenhouses, the design improves specific equipment while integrating the overall structure with the environmental conditions of the greenhouse construction site. This allows for adaptability to local conditions. The greenhouse uses triple-glazed double-cavity glass as the exterior translucent insulation layer. This design helps to reduce the installation of a large number of windows in the Venlo-style glass greenhouse, thus avoiding air leakage due to poor window sealing and reducing insulation capacity. Although the light transmittance of triple-glazed double-cavity glass is 10-15% lower than that of ordinary insulating glass, its thermal resistance value is five times higher, significantly improving the insulation capacity of the exterior facade.
The greenhouse adopts a large slope design on the top, and a reasonable roof angle facilitates the maximum entry of natural light in winter. An external insulation quilt is installed in the north-south gutter, greatly reducing the heating load in winter. The use of a time-based on-off external insulation device and intelligent control system allows the insulation quilt to open and close with the movement of sunlight from east to west. This can effectively reduce the heating energy consumption in winter and the total amount of solar radiation in summer, effectively adjusting the balance of insulation and radiation input.
The greenhouse uses a highly transparent diffused glass as the top lighting material, which has a light transmittance of up to 97.5%. The diffused scattering function makes the light in the greenhouse more uniform, reducing the impact of greenhouse gutters and structural shadows on indoor crop growth.
The greenhouse adopts positive pressure ventilation, which reduces the installation of side windows and wet curtains, thereby reducing the possibility of air leakage. Due to the optimized greenhouse structure and innovative design of the external insulation quilt, it has been calculated that the heating load of the large sloped