The shading system of a multi story greenhouse

The intensity of solar radiation in summer is high. For general greenhouse crops, the light intensity from 10am to 4pm is greater than the saturation point of the crop's light, and excess radiation enters the greenhouse, causing the indoor temperature of the multi greenhouse to be too high. Sunshade is the use of materials with low light transmittance to prevent excess solar radiation from entering the greenhouse. It ensures the normal growth of greenhouse crops while also being a measure to reduce greenhouse temperature. The installation and use of greenhouse shading nets can generally reduce greenhouse temperature by 3-10 ℃. There are two shading methods for greenhouses: indoor shading and outdoor shading.

The outdoor sunshade of a multi story greenhouse is a sunshade installed outside the greenhouse frame, and a sunshade is installed on the frame. The sunshade net can be driven by a curtain pulling mechanism or a film rolling mechanism, and can be opened and closed freely. It can be manually controlled, electrically controlled, or connected to a computer control system as needed to achieve intelligent control. The advantage of outdoor shading is that it directly isolates solar radiation outside the greenhouse, which has a good cooling effect. However, for outdoor shading in multi story greenhouses, a supporting framework needs to be erected on the gutter of the greenhouse, or a separate framework needs to be set up outside the greenhouse to support the shading system, which requires steel. In addition, the overall exposure of the shading system to the outdoor natural environment requires high strength and aging resistance of the shading net, and the mechanical performance of the driving system is required to adapt to various weather conditions.

The indoor shading system of a multi story greenhouse involves installing a shading net inside the greenhouse. The support of the internal shading system is fixed on the pillars and derived frames of the greenhouse, and the shading net is set on the support system. The entire system does not require the production of additional metal frames, which can save steel and facilitate installation. The sunshade net frequently opens and closes, and is generally controlled by electric power. In case of temporary power outage, it can be manually opened and closed. The cooling effect of indoor sunshades is not as good as outdoor sunshades, but indoor sunshades in multi story greenhouses save materials and have low costs. There are two types of driving systems for sunshade nets: cable driven sliding door systems and gear rack driven sliding door systems.