In March 2015, the 11th International Green Building and Building Energy Conservation Conference was held at the Beijing National Convention Center. The convening of previous conferences showed China's attention and attention to green buildings and energy conservation. At present, China's lighting electricity consumption accounts for about 13% of the total power generation. Therefore, how to effectively reduce energy consumption, improve energy efficiency, and reduce carbon dioxide emissions has become a growing concern of the people. The use of LED lights and intelligent control, the rational use of daylighting, etc. are all directions for the development of green lighting technology.
First, the working principle and structure of the light pipe lighting system
The light pipe illumination system can also be called light guide illumination and ducted daylight illumination. As an electroless illumination system, the light guide is mainly made of high-reflection material, and the sunlight obtained by the outdoor lighting component is transmitted to the indoor to realize illumination. The device is mainly composed of three parts: a lighting device, a light guiding device and a diffusing device. The basic principle is that the outdoor natural light is efficiently collected by the hood and redistributed into the system, and then transmitted through a specially made light guide tube, and the natural light is evenly and efficiently irradiated to any place where light is needed by the diffusing device at the bottom. From dawn to dusk, or even cloudy days, the light from the daylighting system of the light pipe is still sufficient. The working principle of the light pipe lighting system breaks the concept that lighting completely depends on electricity, and is a green and healthy lighting product. Light pipe lighting systems will be the most important way of building lighting systems in the future.
1. Lighting device for light pipe lighting system
The lighting device of the light pipe illumination system is mainly composed of a lighting cover and a defense device. The hood is mainly used to collect sunlight and efficiently put light into the transmission system. According to the different lighting modes, the light pipe lighting system can be divided into active lighting and passive lighting. Active lighting refers to the lighting device can actively locate the sun position and collect sunlight by installing specific devices, while the passive type refers to the roof. The daylighting fixture collects sunlight. Due to the limitations of current technological developments, passive lighting systems are currently used in the domestic market.
The defensive device is to ensure a good waterproof effect between the system and the roof, to avoid the impact of rain on the lighting system of the pipeline, and to cause leakage of the roof surface and increase the sealing performance. The rainproof board and the rain cover can be flexibly selected according to the requirements of different building roofs. ring.
2. Transmission device of light pipe illumination system
The transmission device is a core device, which is composed of a plurality of straight or curved illumination light pipes. The inner wall of the light guide tube is coated with a plurality of special films to ensure efficient transmission of light, and the light pipe reflectance is ducted daylight illumination. The main performance indicators of the device.
Light guiding materials currently used are anodized aluminum, reinforced anodized aluminum, silver coated polyester materials produced under vacuum, and non-metallic films. Among them, the non-metallic film has the highest reflectivity, reaching 99.7%, and the high reflectivity can increase the output of the luminous flux. Taking 20 reflections as an example, the non-metallic film material pipe has 94% light output, while the anodized aluminum pipe has only 3%, so that a high reflectance light pipe can transmit light in a long distance in the system. When light encounters obstacles in the transmission device, it is possible to solve the problem that light cannot be turned by using bends of different angles. The bend of the light guide of the transmission device can have a bending change of 0 to 90 degrees.
3. Diffuse device for light pipe lighting system
The diffusing device of the light pipe illumination system is composed of a diffuser, generally at the extreme end, in order to scatter the light transmitted from the transmission device onto the working surface, and has strong transmission and astigmatism, so the device determines The output quality of the pipeline daylighting system. The diffuser is mainly made of PC material or polymethyl methacrylate material. For the beautiful interior decoration, the diffuser can be made into different styles to match the interior decoration.
4. Dimming device for light pipe lighting system
In order to make more reasonable use of daylighting, and truly achieve energy saving, a dimming device is generally installed in the pipeline daylighting system to facilitate adjustment of the brightness of the room.
Second, the characteristics of the light pipe lighting system
1. Saving energy
Energy efficiency is one of the most notable features of plumbing lighting systems. For example, the Jiangsu Urban and Rural Construction Vocational College adopted a green building design when it was built. In particular, the design of the administrative building reached a three-star standard design, so the pipeline lighting system was adopted in the design of the underground garage. The illumination of the garage can be 100lx, and the electricity consumption per unit area is 8w/m2. If the garage area is 2000 square meters, the electricity consumption per day is 8 hours, and the electricity consumption per day reaches 128 degrees, and if the pipeline lighting system is used, You can save energy.
And pipe lighting has made some contributions to indoor temperature insulation. When the length of the light pipe is 0.5m, the system K value is 1.7w/m2. When the length is 3 meters, the system K value is 1.51w/m2, but when the light pipe length is 5m, the system K value is 1.51w/ M2, the system K value is inversely proportional to the length of the light pipe. The longer the length of the light pipe, the lower the thermal conductivity, indicating that the heat insulation effect is better.
2. Effective use of natural resources
The plumbing lighting system has changed our understanding of the original lighting, and the natural sunlight has been used for lighting purposes through special devices. It has brought a new revolution in lighting design and broadened the thinking for architectural design, which is “green buildingâ€. The development of lighting has injected new vitality.
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