Five principles for choosing external sun shade nets

Five principles for choosing external sunshade nets：

1. The choice of shading rate - it is necessary to cool down and meet the needs of crop growth

The selection of the shading rate of the shading net is a complicated task, and it must be analyzed in combination with the requirements of the crop varieties for light, local solar radiation and distribution, local outdoor conditions, greenhouse types, and greenhouse covering materials.

Under the conditions that meet the needs of crop growth, the higher the shading rate, the better the cooling effect.

2. Service life - strength, high temperature resistance, UV resistance

The service life of the external shade mesh mainly depends on the strength of the sunshade net, the outdoor temperature and the anti-ultraviolet ability. Since the external sunshade net is installed outdoors, the ultraviolet rays are much stronger than indoors, so it is required to have good anti-ultraviolet ability. In addition, the materials used Must have certain 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 high strength.

3. Folding size - when folded, try to reduce the occlusion area as much as possible

The outer shade net also requires a smaller folded size to reduce light loss.

4. Cooling effect - mainly depends on the shading rate

After the external sunshade net absorbs solar radiation, its own temperature will increase, and part of the energy will be radiated into the room, thereby increasing the indoor temperature. Therefore, in theory, the external sunshade net woven with aluminum foil has a better cooling effect.

However, because this part of the energy is small, it is generally ignored. It is believed that the part of the energy absorbed by the shade cloth itself has no effect on the temperature in the greenhouse. Therefore, the cooling effect of the external sunshade net is still determined by the shading rate.

5. Energy-saving effect - the external sunshade net used for cooling, heat preservation and energy saving do not require special one-sided pursuit

The energy-saving effect of external shading generally refers to its ability to reflect far infrared rays. When the external shade mesh reflects the far infrared rays radiated from the room back into the room, it can play a certain role in heat preservation and energy saving. Therefore, the external sunshade net woven with aluminum foil has better thermal insulation and energy saving effect.

Generally, the main function of the external sunshade net is to cool down, and there is no need to pursue the function of heat preservation and energy saving.

The above are the five principles for choosing external sunshade nets.