A preliminary study on light pollution of glass curtain walls?

The following is the relevant content about light pollution from glass curtain walls brought to you by Zhongda Consulting for your reference.

1. Overview of glass curtain wall architecture Glass curtain wall is a novel building exterior wall decoration with the distinctive characteristics of modern architecture that is simple and bright. It emerged in high-rise buildings in the United States after World War II (20 mid-century) and subsequently became widely used around the world. However, due to the many disadvantages of this form of exterior wall, such as easy damage, light pollution, poor thermal performance, high energy consumption, etc., it has caused many problems, which has restricted its application at home and abroad in recent years. Glass curtain wall decoration was introduced to my country in the 1980s. Nowadays, modern buildings using glass curtain walls can be seen everywhere in large and medium-sized cities in my country. However, the light pollution caused by this is objective and easy to be ignored. Light pollution from glass curtain walls refers to the use of coated mirror glass and polished mirror metal plates on the curtain walls of high-rise buildings. When direct sunlight hits the surface, reflection glare is produced due to the specular reflection of the glass and metal plates, causing adverse effects on the surrounding environment. Influence. 2. Light pollution caused by modern glass curtain wall buildings. Glass curtain wall buildings built facing the street are like a huge mirror, reflecting and interfering with street traffic. The reflected light can cause sudden temporary blindness and visual illusions for drivers, seriously affecting drivers. Visual judgment can easily lead to traffic accidents. Liaocheng Dong'a Jinhua Steel: High-rise glass curtain wall buildings built near residential areas will cause reflective damage to the surrounding environment. Relevant research data shows that glass curtain walls have the characteristics of condensing and reflecting light in the sun; generally, the reflectivity of mirror glass is between 82 and 92, and the reflectivity of mirror stainless steel plates can reach 96. They are ideal for exterior wall decoration such as rough stone and tiles. The reflectivity of the material is more than 10 times. The reflected light beam is enough to destroy the photoreceptor cells on the retina of the human eye, affect people's vision, make people feel uncomfortable, dizzy, and even cause symptoms such as short-term blindness. According to information from some large and medium-sized cities in my country, road traffic accidents caused by "light pollution" are on the rise, and complaints involving "light pollution" are also increasing in various places. The reflected light from building mirror glass is stronger than sunlight, which is far beyond the range that the human body can bear. In summer, sunlight is reflected into the room. The strong dazzling light is most likely to destroy the original good indoor atmosphere, and also causes the room temperature to rise by about 5 degrees Celsius on average. People who work and live in a polluted environment with white light for a long time can easily cause vision loss, dizziness, nausea, loss of appetite, depression and other symptoms similar to neurasthenia, which can cause changes in people's normal physiology and psychology. In the long run, it can induce certain diseases. some chronic diseases. The State Environmental Protection Administration receives complaints about building light pollution from all over the country every year, which has attracted the attention of relevant national departments. The relevant departments are considering formulating relevant laws and regulations to limit and reduce the occurrence of light pollution. Light pollution from glass curtain walls is produced under the following specific conditions:

(1) The use of large-area high-reflectivity coated mirror glass and mirror metal plates;

(2) Under specific lighting conditions Produced in certain directions (south, west, southwest) and at specific times;

(3) The glass curtain wall adopts a certain arc shape, and the mirrored exterior wall is convex or concave, forming a divergence or focus of reflected light;

(4) The degree of light pollution is closely related to the direction, position and height of the glass curtain wall. 3. Analysis of examples of light pollution from glass curtain walls—Light pollution from the glass curtain walls of Huaneng Building. A resident of a certain city took Huaneng Building to court on the grounds of light pollution. When the 22-story Huaneng Building was completed, its mirrored glass curtain wall reflected light on the surrounding environment under sunlight, causing light pollution. The plaintiff believed that the reflected light from the glass curtain wall and the metal ball on the roof of the Huaneng Building entered the house directly from the rear window of the house where he lived. The reflected light for more than ten hours a day caused the indoor temperature to be too high, affecting normal daily life and aggravating the situation. The original illness was diagnosed, and Huaneng Building was required to immediately eliminate light pollution and compensate for certain economic and mental losses. When the court heard the case, it was unable to make a conclusion as there was no basis to confirm whether the reflection phenomenon of the glass curtain wall and the metal decorative ball on the top of the Huaneng Building met the light pollution standards.

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