First, the concept of external shading
The shading system is divided into inner and outer shading according to the relative position of the installation position and the building wall surface, and the outer shading is a device for shielding sunlight outside the transparent enclosure of the building.
Second, the principle, function and development trend of external shading
Principle: External shading is the use of a physical way to block solar radiant heat and sunlight from entering the room through the perimeter of the building. The way heat is transferred is: heat conduction, heat convection, and heat radiation. Since the energy transfer of solar radiation is mainly thermal radiation, our focus is on the effects of thermal radiation on the indoor environment. When the sun radiates, it appears in the form of light and is divided into three main bands: infrared, visible, and ultraviolet. The ultraviolet light accounts for 3% of the total heat, visible light accounts for 44%, and infrared light accounts for 53%.
More than 50% of the energy consumption of buildings is the energy consumption of air conditioners. Half of the energy consumption of air conditioners is due to the loss of doors and windows. Therefore, the shading outside the building doors and windows is relatively large.
Function: External shading is one of the effective methods for building energy-saving design in China's hot summer and cold winter areas, summer hot and warm winter areas, especially in summer, which blocks solar radiant heat from entering indoors and winters to avoid indoor heat loss. Thermal comfort and light comfort.
Development trend: The real external shading must meet the three conditions of shading insulation, light transmission, ventilation and ventilation. Only when these three conditions are met at the same time, is the real external shading.
Third, the advantages of external and internal shading
1. The sunshade effect of the outer sunshade is better than the inner sunshade. Installation of outdoor shading system can reduce indoor temperature by 7 °C-8 °C, saving 40%-60% of air conditioning energy consumption, installing indoor shading system can reduce indoor temperature by 4 °C-5 °C, saving 30%-45% of air conditioning energy power consumption. In terms of energy saving, the outdoor shading system is superior to the indoor shading system.
2. The external shading system is blocked before the solar radiation reaches the glass curtain wall, and there is no chance of heat entering the room due to the flow of air between the external shading facility and the window. The inner sunshade is treated after the solar radiation enters the room, and a heat island effect is formed between the curtain and the glass. The curtain does not have a sealing effect indoors, and the heat is easily diffused indoors.
Fourth, the outer sunshade advantage products
Advantages of external sunshade products: light-transparent, low-carbon energy-saving, green and environmental protection, sunshade insulation, wind and pressure resistance, fire retardant, self-cleaning and easy to clean, fashionable and so on, in summary, products that can meet the requirements It can only be used for "high-rise building windproof sunshade products" with excellent wind and flame retardant properties, such as outdoor top roller blind translation system, because it has wind and fire resistance to meet all requirements.
The material, thickness, size and form of the sunshade material, the form and specifications of the fixing device, the power of the motor (when electric is used), and the magnitude of the wind pressure at the place of use are related to each other. Professional manufacturers request relevant technical information, and consider it after comprehensive consideration. I hope that our introduction can help you. If you have any questions about the awning, you can consult us and we will have a professional to answer your questions.