5 principles for choosing sunshade nets
The selection of the shading rate of the sunshade net is a complicated task, and a comprehensive analysis must be carried out in accordance with the requirements of the crop varieties on the light, the local solar radiation and distribution, the local outdoor conditions, the type and orientation of the greenhouse, and the greenhouse covering materials. Under the conditions that meet the needs of crop growth, the higher the shading rate, the better the cooling effect.
The service life of the shading net mainly lies in the strength of the shading net, outdoor temperature and UV resistance. Since shading net is installed outdoors, the ultraviolet rays are much stronger than indoors, so it is required to have good UV resistance. In addition, the materials used Must have a certain degree of high temperature resistance.
The outer shading net needs to withstand harsh environments such as wind, rain, snow and hail, so the outer shading net needs higher strength.
The outer shading net also needs a smaller folding size to reduce light loss.
After the outer shading net absorbs solar radiation, its own temperature will increase, and a part of the energy will be radiated into the room, thereby increasing the indoor temperature. Therefore, in theory, the outer shading net woven by aluminum foil has a better cooling effect. But because this part of the energy is relatively small, it is generally ignored. It is believed that the part of the energy absorbed by the sunshade net itself has no effect on the temperature in the greenhouse, so the cooling effect of the outer sunshade net is still determined by the shading rate.
Energy-saving effect-shading net used to cool down, no need for special pursuit of heat preservation and energy saving
The energy-saving effect of external shading generally refers to its ability to reflect far infrared rays. When the external shading net reflects the far infrared rays radiated from the room back indoors, it can play a certain role in heat preservation and energy saving. Therefore, the outer sunshade net woven with aluminum foil has a better heat preservation and energy saving effect. Generally, the main function of the external sunshade net is to cool down, and there is no need to pursue special one-sided pursuit of the function of heat preservation and energy saving.
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