The "Technical Regulations for Construction Lighting Pursuit Mirror System" (JGJ/T295-2013) was released recently. As the first industry standard, this regulation provides a comprehensive technical basis for the production design and construction of the architectural lighting chasing mirror system (hereinafter referred to as the lighting chasing mirror), filling the domestic gap. Although the light chasing mirror has been popular abroad, it is still a new term in China. What is the secret of it? Why should we introduce such a standard? On this topic, the reporter interviewed Hua Jianmin, associate professor of Chongqing University and director of the construction teaching and research section of the Civil Engineering Institute.
Energy-saving weapon for chasing the sun China's building energy efficiency level lags far behind that of developed countries. The thermal function of the envelope structure in most heating areas in China is much worse than that in developed countries with similar climate. The energy consumed per unit area of ​​heating is equivalent to 23 times that of developed countries with similar latitudes. Developing energy-efficient building technologies and reducing energy consumption in building buildings are important for solving energy problems. Hua Jianmin believes that.
Among the many renewable clean energy sources, solar energy has great advantages. Compared with the limited nature of conventional energy sources, solar energy has unlimited reserves and is inexhaustible. And solar energy has a true universality, will not produce pollution, with the use and high economic efficiency. Therefore, the prospects for solar energy in energy conservation and energy replacement technologies are generally optimistic.
The invention of the light chasing mirror came into being, and it was timely.
Hua Jianmin introduced that the light chasing mirror has the function of detecting sunlight and adjusting the steering according to the angle of sunlight. It can reflect sunlight to a designated area and consists of four parts: chasing mirror, mirror, control box and astigmatism. The accurate positioning of the mirror and the mirror base realizes the installation of the chasing mirror and the mirror. At the same time, the control box and the follow-up mirror are connected together by a cable. Through the debugging control of the control box, the best chasing mirror is determined for the sun. The angle, so as to maximize the reflection of light to the mirror, through the reflection of the mirror and the scattering of the astigmatic lens, the sunlight inside the building is sufficient.
Talking about the advantages of the chasing mirror, Hua Jianmin cited the most important three: First, the chasing mirror can provide natural light for the building interior. The technology effectively utilizes sunlight illumination to increase the natural atmosphere in the building. The purpose of natural light source instead of artificial light source is to reduce the artificial lighting in the use area and reduce the amount of electrical installation of lamps, pipelines, switches, etc. Second, the green natural energy utilization system. The technology meets the requirements of environmental protection and energy conservation, can greatly reduce the energy consumption within the system, and is an ultra-low energy green energy lighting system. This natural energy utilization system will be one of the development trends of environmental protection and energy conservation projects in the future; third, it will save the maintenance, replacement, cleaning and energy consumption costs of the corresponding electrical lighting systems brought by the later use.
New technology calls for standardization However, as a new technology for green energy conservation and environmental protection, the application of the light chasing mirror is not yet mature. The main problem is reflected in the special working methods of the architectural lighting chasing mirror system (detecting sunlight, changing angles, etc.), so that the buildings using this system have many special requirements compared to ordinary buildings. These special requirements will be designed for the whole building. And construction has a great impact, even constraints. Hua Jianmin said.
When a lighting chase mirror is set up in a new, rebuilt and expanded building project, its design should be incorporated into the architectural design. In the architectural design, conditions should be set for setting the lighting chasing mirror, and when adding the lighting chasing mirror to the existing building, it is necessary to consider whether it will affect the structural safety of the house. The construction and installation plan of the lighting chase mirror project should ensure that the system can achieve the expected design effect.
Hua Jianmin further pointed out that in the process of popularization and use of the light chasing mirror, the lack of corresponding implementation standards in China has restricted the use and promotion of the technology to a certain extent.
In the absence of relevant construction techniques and acceptance regulations to guide the current situation of lighting chasing mirror construction, in 2012, the preparation of the "Technical Regulations for Construction Lighting Chasing Mirror System Construction" began, China Construction Third Bureau Second Company, Chongqing University, Wuhan University, Shenyang Construction The University, Central South Architectural Design Institute and related units participated in the preparation. In October this year, the Ministry of Housing and Urban-Rural Development issued the “Technical Regulations for Construction Lighting Chasing Mirror System Constructionâ€, which will be implemented on April 1, 2014.
The road to comprehensive promotion is still long. At present, the application of the chasing mirror is mainly in developed countries in Europe. It is relatively backward in China and there are few manufacturers. We also use German products. Chen Xinan, deputy chief engineer of China Construction Third Bureau, told reporters that as the first company in China to use the light-seeking mirror technology in the project, the company has successfully completed the construction project of the light-seeking mirror and formed a provincial-level construction method. Due to its rich experience in building construction, China Construction Third Bureau Second Company became the first editor-in-chief of the “Technical Regulations for Construction Lighting Chasing Mirror System Constructionâ€.
After the formal implementation of the procedures, it can play a good guiding role for the industry. However, people generally have a misunderstanding about the use of light-seeking mirrors. One is that they don't know about this technology, and the other is that people who know it are not willing to apply it. Chen Xin'an introduced that we made a comparative calculation that the hypothetical product is pure imported equipment. Although some investment is required in the early stage, the cost in the later period is not much, and it can be recovered in about ten years.
As a green energy-saving and environmental protection technology, the promotion and use of the light-seeking mirror may be restricted by factors such as imperfect national green environmental protection regulations, green buildings, green construction and low implementation. Hua Jianmin has deep feelings about this.
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