Overview
The double arch double membrane greenhouse is a modern agricultural structure combining two arched layers covered with plastic film. This design significantly improves thermal efficiency compared to single-layer greenhouses, making it suitable for regions with harsh winters or temperature fluctuations. The dual-layer film creates an insulating air gap, reducing heat loss by up to 40% while maintaining high light transmission (typically 85-90%). Its modular steel framework allows for spans ranging from 6 to 12 meters, accommodating diverse crop layouts and mechanization.
Structure and Working Principle
The greenhouse features parallel arched steel trusses supporting inner and outer plastic membranes. The 30-50cm air gap between layers acts as a thermal buffer, with optional inflation systems to maintain the interlayer space. Automatic ventilation systems (roll-up sidewalls or roof vents) regulate temperature and humidity. The outer membrane typically uses 150-200 micron UV-resistant polyethylene, while the inner layer may be thinner (80-120 microns) for light diffusion. The steel framework is hot-dip galvanized for corrosion resistance, with a lifespan exceeding 15 years.
Key Features
1. Energy Efficiency: The air gap reduces heating costs by 20-35% compared to single-layer structures, with R-values between 1.5-2.0. 2. Durability: Reinforced film edges and anti-drip coatings prevent premature degradation. The arch design withstands snow loads up to 35kg/m² and wind speeds of 20m/s. 3. Customization: Options include integrated irrigation systems, shade nets, and automated climate controls compatible with IoT monitoring.
Application Areas
Commercial vegetable production (tomatoes, cucumbers, leafy greens) benefits from the extended growing season and reduced frost risk. Floriculture operations utilize the consistent microclimate for premium flower cultivation. In northern climates, these greenhouses enable year-round production without expensive glass structures. They're also deployed for organic farming and plant nurseries requiring precise environmental control.
Maintenance and Precautions
Biannual film inspections are crucial to identify wear, especially at contact points with the framework. Use soft brushes for cleaning to avoid scratches that accelerate UV degradation. In snowy regions, temporary internal supports may be needed to prevent membrane collapse. Ensure proper grounding of the steel structure to avoid static electricity buildup that attracts dust to the film surfaces.
B2B Procurement Guide
For bulk purchases (5,000+ sqm), negotiate film warranties (typically 3-5 years) and framework certifications (ISO 9001, CE). Request samples of frame coatings and film light transmission test reports. Leading manufacturers offer design customization for gutter height (recommended 3-4m for tall crops) and column spacing (4-5m for machinery access). Containerized shipping is standard for international orders, with assembly teams available for on-site construction.
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