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Multi-span film greenhouses have higher land utilization rate than other greenhouses and are cost-effective. They are multi-span greenhouses covered with film. A complete multi-span film greenhouse mainly consists of hot-dip galvanized steel main frame, greenhouse civil foundation, covering materials, hot-dip galvanized steel outer sunshade frame, internal thermal insulation system, outer sunshade system, cooling system with wet curtain and fan, rolling film window system at top and surrounding, power distribution system, spraying system and drainage system.
Solar greenhouse, short for energy-saving solar greenhouse, also known as warm shed, is composed of gable walls on both sides, enclosure walls, supporting frames and covering materials. It is a unique greenhouse type in northern China without indoor heating. The rear wall absorbs solar energy to store and release heat to maintain a certain indoor temperature for the growth of vegetable crops.
Greenhouse breeding, also called warm shed breeding, is an advanced, mature and applicable technology. It can achieve the same breeding effect as fully enclosed livestock houses with low investment. It can reduce livestock and poultry mortality by 2.7%-13.5%, increase meat and egg yield by 12%-25%, and save more than 11% of feed. It promotes the popularization of improved varieties and new technologies, drives moderate-scale breeding, realizes balanced supply of livestock and poultry products, and serves as an important technology for developing high-yield and high-quality animal husbandry.
Oval tubes have become popular greenhouse frame materials in recent years due to excellent compression resistance. Early oval tubes were processed from round tubes, which limited their application due to fixed round tube specifications. Nowadays, they are directly made of galvanized strip steel with adjustable length to reduce promotion restrictions. Greenhouses with oval steel frames have a span of 10-20 meters, length of 50-120 meters, ridge height of 5.0-6 meters and side height of about 1.5-1.7 meters. The greenhouse is covered with 0.15mm anti-dripping film fixed by film pressing lines. Electric film rollers are installed at roof and bottom vents for ventilation and cooling in summer. The whole greenhouse is covered with rainproof thermal insulation quilts outside, and electric rolling machines are equipped on both sides.