The function of external shading: 1. Blocking strong light: External shading is located on the outside of the top of the greenhouse and can block most of the strong light before it directly reaches the greenhouse. It can flexibly adjust the degree of shading according to different seasons and light intensities, providing suitable light conditions for the greenhouse. For instance, during the intense summer sunlight, external shading can reduce the light intensity to a suitable range for crops, preventing them from growing poorly due to excessive light. 2. Heat insulation and cooling: One of the main functions of external shading is heat insulation, which can effectively reflect and absorb solar radiation heat and prevent heat from entering the greenhouse interior. In the hot summer, external shading can lower the internal temperature of the greenhouse by 3 to 5 degrees Celsius or even more than when there is no shading, creating a relatively cool growth environment for crops and helping to alleviate the stress of high temperatures on crops. 3. Prolonging the service life of facilities: External shading can reduce the direct exposure of sunlight to the greenhouse film or other covering materials, slow down the aging speed of the materials, and thus extend the service life of the greenhouse facilities. Long-term exposure to sunlight can gradually make the film brittle and break, while external shading can effectively reduce this damage, lowering the maintenance cost and replacement frequency of the facilities. 4. Energy conservation: As external shading can lower the temperature inside the greenhouse, it reduces the frequency and duration of use of ventilation and cooling equipment as well as air conditioners and other refrigeration devices, thereby achieving the goal of energy conservation. In some large greenhouses, this can significantly reduce operating costs and achieve the effect of energy conservation and emission reduction. |
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