Greenhouses are light buildings. Therefore, there is a need for good light transmission when building greenhouses. The light transmittance is one of the most basic indicators for evaluating the light transmission performance of greenhouses. Transmittance refers to the percentage of the amount of sunlight that penetrates the greenhouse and the amount of outdoor lighting. The light transmittance of greenhouses is affected by the light transmission properties of greenhouse light-transmitting materials and the shadow rate of greenhouse skeletons. With the different solar radiation angles in different seasons, the light transmittance of greenhouses also changes at any time. The light transmittance of greenhouses has become a direct factor in the growth of crops and the selection of crop varieties.
Greenhouses should pay attention to insulation performance, improve greenhouse insulation performance, reduce energy consumption, is the most direct means to increase greenhouse production efficiency. The greenhouse insulation ratio is a basic measure of greenhouse insulation performance. The greenhouse insulation ratio refers to the ratio of the coverage area of ​​the greenhouse light-transmissive material with small thermal resistance to the sum of the area of ​​the greenhouse coverage structure with the larger thermal resistance. The greater the insulation ratio, the better the insulation performance of the greenhouse.
The construction of greenhouses must take into account their durability. The durability of greenhouses is affected by factors such as the aging resistance of greenhouse materials and the carrying capacity of the main structure of greenhouses. In addition to its own strength, the durability of light-transmitting materials also shows that the light transmittance of the material is continuously attenuated with the extension of time, and the degree of attenuation of the light transmittance is a decisive factor influencing the service life of the light-transmitting material. Because the greenhouse operation is under high temperature and high humidity for a long time, the surface anti-corrosion of the components becomes one of the important factors affecting the service life of the greenhouse.
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