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How to choose covering materials for smart greenhouses, such as glass, solar panels, and plastic films

by:UNQ     2021-03-06
The common covering materials and advantages and disadvantages of smart greenhouses are mainly introduced to our planting friends from the price, service life, insulation coefficient, and light transmittance. 1. The covering material is transparent glass. The intelligent glass greenhouse is mainly made of colorless transparent glass. There are also some glass greenhouses with landscape greenhouses and ecological restaurants. They choose some coated and colored glass for aesthetics, which increases the height of the greenhouse and reduces the daylighting rate. 1. Generally, the normal service life of glass is more than 20 years. Long service life is one of the great advantages of glass. The framework of the intelligent greenhouse basically adopts the hot-dip galvanized square steel framework, and the design service life is 20 years. If there are special requirements, it can be designed for 50 years. 2. Judging from the light transmittance of glass, the light transmittance of ordinary white glass is between 85% and 88%, and the light transmittance of low-iron ultra-white glass is between 90% and 92%. If the light transmittance of the double-sided coating of ultra-white glass is as high as 97.5%, the yield of light-loving crops will increase significantly. 3. From the perspective of glass insulation coefficient, the K value of single-layer glass is 6.3~6.4, and the K value of double-layer hollow glass is 3.0~4.0. It can be seen from the data parameters that the insulation coefficient of single-layer glass is poor, which generally refers to the top of the smart greenhouse. Single-layer tempered glass is used, and double-layer insulating glass (5+6+5 double-layer glass) is basically used on all sides. 2. Double-layer hollow solar panels mostly use hollow solar panels, and now there are three or more layers of solar panels. At present, greenhouses using sun panels on the top or around the smart greenhouse are very common. The advantages of the sun board are good thermal insulation performance, light weight (1.4 kg per square meter), and convenient construction. 1. Generally, the service life of the hollow solar panel is 10 years, and the light transmittance and yellowing coefficient of the solar panel will be within a reasonable coefficient range within 10 years. Basically, the cost of using German Bayer's 1.4 grams of sun panels is about 75 yuan/square meter. 2. Hollow solar panels are divided into 8mm, 10mm, 12mm according to the thickness (8mm is the most used in solar panel smart greenhouses). The light transmittance is about 79%, and the light transmittance is moderate. 3. In terms of thermal insulation coefficient, the K value of 8mm hollow solar panels is 3.3, and the thermal insulation performance is better. Smart greenhouses using hollow solar panels are also very common in the north. Third, plastic film (multi-span film greenhouse) The commonly used plastic film is basically po film, pe film, and pvc film. Generally, multi-span film greenhouse uses 15-filament Po film, and the service life can reach five years. The light transmittance of plastic film is about 87%, and the solar panel is basically the same. Generally, the thermal insulation performance of a single-layer film and a single-layer glass is not very satisfactory. Therefore, many multi-span film greenhouses are surrounded by multi-layer or double-layer film structure, which is more conducive to increasing the thermal insulation effect in the multi-span film greenhouse. Multi-span film film is mainly for users of greenhouses that are used in the short term. It is a very practical type of greenhouse. For long-term practical use, it is better to choose a glass greenhouse or a solar panel greenhouse.
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