Key points for the construction of polycarbonate greenhouse tunnels produced by Qingzhou Changrong Greenhouse Engineering Co., Ltd.: For natural ventilation in polycarbonate greenhouses, attention should be paid to the density difference of gas exchange caused by the temperature difference between the inside and outside of the greenhouse, as this density difference drives the indoor and outdoor air exchange; the distribution of outdoor natural wind pressure in the polycarbonate greenhouse area drives air movement. The location of the polycarbonate greenhouse is very important. If the site has good ventilation conditions, it is easy to achieve indoor and outdoor air circulation in the greenhouse, which actively helps with ventilation and cooling.

The structure, window design, and window area of the polycarbonate greenhouse: The greenhouse structure is stable, elegant, visually pleasing, with good insulation, moderate light transmission, large rain trough with wide span, grid structure, and large drainage capacity; the greenhouse frame uses rectangular tubes, square tubes, and other profiles to weld the greenhouse beams, columns, purlins, and trusses. The top and walls are usually enclosed with PC sheets (polycarbonate sheets), and the interior space of the polycarbonate greenhouse can be freely arranged. Inside the greenhouse hangs a cooling system with water curtains. When the indoor temperature is high, water is pumped and flows down through the curtains, cooling the interior. Fans distributed in the greenhouse can also help adjust the temperature.

The greenhouse top shading system includes external shading, internal shading, and internal insulation systems, all controlled by computer. The weather station system on the outside of the greenhouse can monitor wind direction and temperature. The configuration of the polycarbonate greenhouse shading system helps reduce heat accumulation inside the greenhouse, and the comprehensive temperature under the shading canopy is actually lower than that directly exposed to sunlight outdoors.

External shading has a better cooling effect than internal shading. Unless plants have specific requirements, the external shading system is generally installed. Similarly, different structural designs of the external shading system can have different cooling effects on the polycarbonate greenhouse. Of course, the external shading system is a relatively weak link in the overall greenhouse, but in the South China region, which is prone to high-temperature storms and typhoons, the structural strength of the shading system must be prioritized.