2. Photoelectric utilization of solar energy. Using photovoltaic effect to convert solar energy into electric energy, such as: solar cells;
3. Sunlight reflection and utilization. Or directly use sunlight, direct sunlight into the room, to achieve the lighting effect, such as: light tube lighting system. As a non-electric lighting system, light pipe lighting system can use sunlight for indoor lighting in buildings during the day. The basic principle is that outdoor natural light is efficiently collected by the lighting cover and introduced into the system for redistribution, and then transmitted through a special light guide tube, and the natural light is evenly and efficiently irradiated to any place where light is needed through the diffuser at the bottom. From dawn to dusk, even if it is cloudy, the light introduced into the room by the solar lighting system of the light guide tube is still sufficient. The device mainly consists of three parts: lighting device, light guide device and diffusion device.
Daylighting device: also known as light collector, it is the outdoor part of light pipe lighting system, which is used to collect sunlight. Air tightness, water tightness, wind pressure resistance and impact resistance are important performance indicators. At present, most of the lighting covers are hemispherical, and the light collection effect is better than that of traditional skylights and lighting skylights, but most of them are made of PMMA (acrylic) or PC by blow molding, both of which have the disadvantage of weak impact resistance. The latest collector is a crystal diamond collector with patented design, and its effective solar heat collection surface area (EDCS) is several times higher than that of ordinary transparent lighting cover. Unique thread design-the top thread can divide the strong direct sunlight at noon-the side segmented thread can refract the diffused light in the morning and evening to achieve more collection effect.
Light guide device: also known as light guide tube, is the key component to transmit light, and its internal surface reflectivity has a great influence on the system efficiency. In order to ensure the high transmission efficiency of the whole system, the pipe wall material with high reflection should be adopted. The transmittance can be tested according to the current national standard "Classification and Test Method of Daylighting Performance of Windows" (GB/T 1 1976). When the pipe length exceeds 20 times the pipe diameter, the transmission efficiency is lower than 0.75, which makes the overall efficiency of the system lower than 0.5. It is uneconomical to use and should not be adopted.
Diffuser: The main function is to distribute the collected outdoor natural light indoors as much as possible. In addition to ensuring reasonable light distribution, it should also have high light transmittance and improve the efficiency of the whole system.
Dimmer: it is an additional device of light pipe lighting system, which is used to adjust the light output. Add your daylight ideas to any place where you need to provide daytime lighting for:
Public buildings: shopping malls, supermarkets, stadiums, exhibition halls, zoos and museums;
Industrial buildings: large workshops, warehouses and subway maintenance workshops;
Military facilities: hangar, maintenance hangar, equipment hangar, tunnel, etc.
Civil buildings: waiting hall, underground passage, subway, light rail and other waiting halls, schools, hospitals, government agencies, prisons, senior clubs, hotels, hotels, mobile homes, family houses, villas, etc.