Polycarbonate Roof And Glass Wall Greenhouse

• Roof Ridge: Constructed using 8mm or 10mm double-walled hollow polycarbonate sheets, this material can absorb the kinetic energy of hailstones falling at terminal velocity without cracking, providing comprehensive protection for crops. The cellular hollow structure of these multi-layered polycarbonate sheets naturally scatters direct sunlight into wide-angle diffused light, preventing sunburn on the upper leaves. Furthermore, an 8mm double-walled polycarbonate sheet weighs only 1.5–1.7 kg/m², reducing the roof-covering load by more than 80%, which in turn lowers costs for raw steel materials and transportation.
• Side walls: Constructed using 4mm or 5mm float glass, which offers exceptional optical clarity and an aesthetically pleasing appearance. This glass provides excellent sound insulation and is classified as a completely non-combustible, Class A1 fire-rated material. With a very low coefficient of thermal expansion, the glass integrates perfectly with the continuous rubber sealing strips of the aluminum alloy profiles; this precise fit ensures superior airtightness, eliminating drafts, effectively maintaining positive or negative pressure ventilation environments, and preventing the entry of insects. 

To achieve a climate conducive to balanced crop growth, Zheyang has designed environmental control systems for commercial hybrid greenhouses, including: 

• Aerodynamic roof and side ventilation: Continuous electric rack-and-pinion vents are installed along the roof ridge, integrated with insect screens to block pests while ensuring effective aerodynamic ventilation.
• External shading screen: An open-weave screen installed above a polycarbonate roof, designed to block excessive ultraviolet (UV) radiation and solar energy.
• Internal thermal curtain: Utilizes a composite material with a closed structure to trap thermal radiation within the crop canopy microclimate, reducing heating fuel consumption by 35%–45%.
• Evaporative cooling system with wet pads and exhaust fans: Comprising evaporative cellulose wet pads and low-noise, high-capacity, variable-speed exhaust fans, this system completes a full air exchange every 45–60 seconds, ensuring that an optimal canopy temperature is maintained during the peak heat of summer.

Cost-cutting for polycarbonate roof and glass wall greenhouse:

• Reduced steel consumption: With lightweight polycarbonate roofing, structural engineers can increase truss spans and optimize steel column cross-sections, resulting in an 8%–12% reduction in the total tonnage of structural steel per hectare.
• Container Utilization: Polycarbonate sheets can be stacked flat, significantly improving space utilization. Composite roofing components allow for greater surface area coverage per 40-foot high-cube shipping container, reducing ocean freight costs by 25%.
• Energy efficiency: During the winter heating season, a roof made of multi-wall polycarbonate sheets—thanks to its lower heat transfer coefficient—can save approximately 20%–30% of thermal energy compared to a single-layer glass roof.
• Maintenance costs: For greenhouses with all-glass structures, a hailstorm can lead to expenses for cleanup and material replacement; in contrast, a composite roof with impact-resistant properties can completely eliminate such catastrophic risks.