ã€China Aluminum Network】 The essence of green building is to ensure that the environment and health of the indoor environment are met, to meet the full life cycle of the building to realize the efficient saving of resources and energy consumption, and to take into account the minimization of negative pollution to the surrounding environment as much as possible. effect. In short, green building is a kind of realm that is healthy, efficient, and natural, while pursuing simplicity, in order to facilitate the sustainability of the construction industry. In response to China's rapid urbanization process, China's "Green Building Evaluation Standard" (hereinafter referred to as the "Green Standard") was formally promulgated in 2006. As of July 2012, the number of green building projects publicized by the Ministry of Housing and Urban-Rural Development reached 488 with an average annual growth rate of more than 300%. It is predicted that the total amount of green buildings in China will reach 1 billion m during the 12th Five-Year Plan period. Glass curtain walls will be the main ones. Building products. Need to focus on their own energy-saving, create a comfortable indoor environment, while taking into account the resource-saving and renewable energy utilization and other green "functionality. To adapt to the rapid development of the current green building. 2, the characteristics and requirements of the green curtain wall Most of the energy consumption in buildings is used for lighting, ventilation, heating and cooling to create an artificial indoor climate. The curtain wall is the skin of the building, so the green curtain wall should have the functions of natural lighting, effective ventilation, shielding noise, energy saving, pollution prevention, etc., and can be realized or adjusted through the curtain wall structure. 2.1 Curtain Wall and Natural Lighting Natural lighting is the introduction of sunlight into the interior of a building and its distribution in a certain way to provide better and better quality lighting than artificial lighting. Natural lighting can change the intensity, color, and vision of light, creating a healthier and more exciting work environment than an artificial lighting system. Statistics show that the energy consumption of lighting in buildings accounts for 40% to 50% of the total energy consumption, and the increase in cooling load caused by the waste heat generated during cooling season accounts for 3% of the total energy consumption – 5 %. Therefore, rational design and effective use of natural daylight can significantly reduce the energy consumption of lighting in buildings, while also reducing power demand and pollution and by-products generated by power generation, in line with the purpose of green building. Natural light can meet people's visual requirements more and more constantly. It is a requirement of modern architecture for the performance of curtain wall lighting, and it is also one of the ways to save energy in green buildings. 2.2 Curtain Wall and Natural Ventilation Indoor air quality is the result of many complex factors interacting with each other, and ventilation can provide users with enough fresh air to eliminate the source of microbial pollution. It is an important way to improve indoor air quality. According to the technology used for ventilation, it can be divided into mechanical (assisted) ventilation and natural ventilation. As an external protection system, the curtain wall in the mechanical (auxiliary) ventilation design should consider the size of the new tuyere must meet the requirements of the new air volume; must be located away from the source of pollution. Natural ventilation does not consume non-renewable energy. It is a commonly used technical measure for green buildings today. 2.3 Curtain Wall and Building Energy Saving The most important factor influencing the energy-saving design of curtain walls is the climate. Different design strategies and technical measures should be adopted for different climate conditions such as dry heat, hot and humid, warm or cold. The usual method is to use appropriate materials and reasonable construction measures to improve the energy efficiency of the curtain wall; more active is to collect and use the natural environment energy of buildings such as wind and solar energy to save the consumption of non-renewable energy. 2.4 Curtain Wall and "Light Pollution" The so-called “light pollution†of the curtain wall means that due to the reflective properties of the glass, the curtain wall reflects sunlight and heat and night lights to the surrounding buildings or roads, causing the temperature of these buildings to increase in the summer or the night window to be too bright, affecting people. A normal living life or visual disturbance to pedestrians and drivers on the road. This problem has caused people to be very disgusted with the glass curtain wall. This is also contrary to the concept of a green curtain wall, which is very different from the green building advocated. With the continuous development of curtain wall materials and construction technology, we can address the “light pollution†brought about by the reflection of glass curtain walls in the following aspects. 3. Several common green curtain walls The green energy-saving curtain wall is a curtain wall that has no pollution (or low pollution), and it has environmental protection and energy saving functions. This is an inevitable trend in the future development of curtain walls. Currently, there are three types of green energy-saving curtain walls that are applied and researched: photovoltaic curtain walls, double-layer dynamic energy-saving curtain walls, and ecological curtain walls. 3.1 Photoelectric curtain wall Photoelectric curtain wall is a new type of building curtain wall that integrates power generation, sound insulation, heat insulation, safety, and decorative functions. It uses photovoltaic cells and photovoltaic panels technology to convert sunlight into electricity. The key technology is solar photovoltaic cell technology. Photocells require little maintenance, have a long life, and do not generate pollution in the photoelectric conversion process. They are highly sustainable technologies. Photovoltaic panels are membrane-type photocells that look like tinted glass. They use part of the incident sunlight to generate electricity, while allowing some sunlight to pass through and provide illumination. Photovoltaic panels generate direct current, which is relatively easy to store in the battery, and then use the transformer device to convert the direct current into alternating current for use in construction equipment. Photovoltaic panels are mainly designed to slop roofs and double as roof shades, which can effectively collect and use solar energy. The photovoltaic panel can also be used as a sunshade device for lighting locations, which also acts as a shader and solar collector. Photovoltaic curtain wall integrates solar photovoltaic technology and curtain wall technology and is a new type of functional building curtain wall. It uses solar power generation technology to convert sunlight that was previously shielded from harmful elements into electricity that can be used by people. The other significant significance of the photovoltaic curtain wall is also reflected in its integration of solar power generation technology into the building curtain wall products, which does not occupy special land, and solar photovoltaic panels can also replace traditional glass and other curtain wall panel materials without repetitive investment. 3.2 Double Dynamic Energy Curtain Wall The double-layer dynamic energy-conserving curtain wall is a curtain wall composed of a double-layer structure. It consists of an outer curtain wall, an inner curtain wall, a curtain wall, an inlet curtain wall, and an air outlet device. The inner layer generally has doors and windows that can be opened. Under the cover of the outer curtain wall, the outdoor environment can be very poor and the inner doors and windows can be normally opened. The outer and inner curtain walls can be controlled to open and close the inner and outer doors. The heat channel between the two can use the solar energy to generate the chimney effect or the greenhouse effect, so as to ensure the necessary ventilation and ventilation, and to save energy. Therefore, the double-layer dynamic energy-saving curtain wall is also known as the hot-aisle curtain wall, which is divided into natural ventilation and forced ventilation according to the principle of ventilation. The double-layer dynamic curtain wall is equipped with an electric swing window, parallel outer window, electric shading shutter and electric vent inside the curtain wall; the top of the roof is in the form of steel structure; the roof is divided into two layers; the upper layer is electric shading shutter On the lower level, there is an Hidden Frame Bori screen wall with an electric sliding window; the light-collecting curtain wall accounts for a large proportion of the entire curtain wall area and is easy to obtain sufficient light. Its technical features include: a) Using the principle of hot-pressing and the chimney effect, fresh air is allowed to enter the room, the indoor polluted air is discharged to the outside, and dust can be effectively prevented from entering the room. It has a green environmental protection effect; b) It is very reasonable for winter "cold treatment" and summer "heat treatment", it has excellent winter insulation and summer heat insulation, so it has typical dynamic energy-saving; C) reasonable lighting function, according to the needs of users, adjust the light changes, change the indoor environment; d) Excellent sound insulation and noise reduction function, creating a quiet work environment for users; e) High technical content, special structure, and good visual aesthetics. 3.3 Ecological curtain wall Ecological curtain wall is developed with the development of building ecology. The so-called ecological architecture refers to a building that can change the architectural ecology and architectural color according to the function or use requirements of a building. According to the function or use requirements, the building curtain wall that can change the ecology and color is called the ecological curtain wall. The ecological curtain wall is a kind of ecological building. It takes the strategy of “sustainable development†as its strategy, and uses the high and new technology as its guide. The climate buffer layer is appropriate, saves resources, and reduces pollution. It is a healthy and comfortable ecological building envelope structure. The ecological curtain wall can establish a buffer zone between the building and the surrounding ecological environment, which can not only prevent various extreme climates from affecting the indoor environment to a certain extent, but also strengthen the effects of various microscopic climate adjustments, thereby satisfying people's various comforts. Requirements, and can achieve the goal of appropriate energy conservation. Ecological curtain wall construction is beyond the scope of conventional architecture and architectural engineering. It is a systematic project that requires architects, structural engineers, and curtain wall engineers to become familiar with mechanical transmission principles, and to understand the related scientific disciplines such as machining, assembly, and physics, chemistry, and automatic control. Knowledge requires the coordination of multiple disciplines and the cooperation of all majors. While arranging for the settlement of residential housing and rapid changes in the urban landscape, the sharp decline in arable land, increased pollution, sharp increase in energy consumption, and resource destruction have brought many environmental and social problems, and the issue of sustainable building development has been severe. It's before us. The curtain wall as an advanced building external protection system and high-grade exterior decoration products should not be used merely to showcase the wealth of luxury shells, but should be based on the purpose of green buildings, with the goal of sustainable development as the goal of ecological architecture and Integration of advanced building technologies.