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Detailed explanation of photovoltaic glass curtain wall technology

How much do you know about photovoltaic glass curtain wall technology? Photovoltaic curtain wall not only has the functions of flame retardant, heat insulation and noise reduction, but also can reduce light pollution compared with ordinary glass curtain wall. Let's take a look!

Reflective glass curtain wall refers to the external protective structure or decorative structure of the building, which can be displaced relative to the main structure through the supporting structure system without sharing the role of the main structure. There are two kinds of walls: single glass and double glass. Glass curtain wall is a beautiful and novel method of building wall decoration, and it is a remarkable feature of modernist high-rise building era. 20 13 According to FLAP (Fatal Awareness Program) statistics, in Toronto alone,/kloc-0 to 9 million migratory birds die from these glass curtain walls every year. The glass curtain wall of modern high-rise buildings is made of mirror glass and ordinary glass, and the interlayer is filled with dry air or inert gas. There are two layers and three layers of insulating glass, and the two layers of insulating glass are sealed by two layers of glass and a frame to form a sandwich space; Triple glazing is two sandwich spaces composed of triple glazing. Insulating glass has the advantages of sound insulation, heat insulation, frost prevention, moisture prevention and strong wind pressure resistance. According to the measurement, when the outdoor temperature is-10℃, the temperature in front of single-layer glass window is -2℃, while the indoor temperature when using three-layer insulating glass is 13℃. In hot summer, double-layer insulating glass can block 90% of solar radiation heat. Sunlight can still penetrate through the glass curtain wall, but most of them will not feel hot when exposed to sunlight. The room with hollow glass curtain wall can be warm in winter and cool in summer, which greatly improves the living environment.

Detailed explanation of photovoltaic glass curtain wall technology

Photovoltaic glass is a kind of special glass which uses solar radiation to generate electricity by laminating solar cells, and has related current extraction devices and cables. It has the advantages of beautiful appearance, controllable light transmission, energy-saving power generation, no fuel, no waste gas, no waste heat, no waste residue and no noise pollution, and is widely used, such as solar smart windows, solar pavilions, photovoltaic glass building ceilings and photovoltaic glass curtain walls. Photovoltaic glass can be divided into crystalline silicon photovoltaic glass and thin film photovoltaic glass, in which crystalline silicon is the most commonly used curtain wall, and it is also divided into monocrystalline silicon and polycrystalline silicon. The photovoltaic glass described below consists of five layers: glass -PVB(EVA) film-solar cell -PVB(EVA) film-glass * * * (see the figure below), which is similar to the laminated glass commonly used in buildings and has good safety. By controlling the cell gap and edge gap between double-sided glass, photovoltaic glass with light transmittance of 5% ~ 80% can be made. For hollow photovoltaic glass, double-glass laminated photovoltaic modules are used to replace the outer glass of hollow glass, and there are more steps to synthesize hollow photovoltaic modules than double-glass laminated photovoltaic modules in the production process. There is no essential difference. Because the power generation efficiency of crystalline silicon photovoltaic module will decrease at high temperature, hollow photovoltaic module glass is generally used in non-high temperature areas. Thin film photovoltaic glass is characterized by light weight, thin thickness, flexibility, portability and good weak light. In the case of weak light in the morning and evening, the power generation effect is better than that of monocrystalline silicon battery, but the conversion efficiency is not as high as that of traditional monocrystalline silicon battery.

Solar photovoltaic glass consists of low-iron glass, solar cells, films, back glass and special metal wires. It seals the solar cell between low-iron glass and back glass through thin film, which is the most novel high-tech glass product for building. Low-iron glass is used to cover solar cells to ensure more light transmittance and generate more electricity. Tempered low-iron glass has higher strength and can withstand greater wind pressure and greater temperature difference between day and night.

Glass curtain wall is a new type of contemporary wall, which endows architecture with the greatest feature of organically unifying architectural aesthetics, architectural functions, architectural energy conservation and architectural structure. Architecture presents different colors from different angles, which gives people dynamic beauty with the changes of sunlight, moonlight and lighting. Magnificent glass curtain wall buildings have been built in major cities on all continents, such as New York World Trade Center, Chicago Petroleum Building and Sears Building. Bank of China Tower in Hong Kong, Great Wall Hotel in Beijing and Lianyi Building in Shanghai have also been adopted.

Reflective insulating glass is 6 mm thick and weighs about 50kg/_, which has the advantages of portability, beauty, less pollution and energy saving. The inner side of the outer glass of the curtain wall is coated with colored metal coating. From the appearance, the whole external wall is like a mirror, reflecting the scenery of the sky and the surrounding environment. When the light changes, the image is colorful and changeable. Under the reflection of light, the room is not exposed to strong light, and the vision is soft. China 1983 was first adopted in the Great Wall Hotel project.

Photovoltaic curtain wall integrates photovoltaic power generation technology and curtain wall technology, which is a high-tech product and represents the latest development direction of building solar energy integration technology in the world. Photovoltaic curtain wall is a special kind of resin, which sticks solar cells on glass and embeds them between two pieces of glass. Through the battery, light energy can be converted into electric energy. In addition to the main function of photovoltaic curtain wall for power generation, photovoltaic curtain wall also has obvious functions of heat insulation, sound insulation, safety and decoration. In particular, solar cell power generation will not emit carbon dioxide or produce gases harmful to the greenhouse effect, and there is no noise. It is a kind of clean energy and has good compatibility with the environment.

A, crystalline silicon battery

According to its characteristics, solar cells can be divided into monocrystalline silicon cells, polycrystalline silicon cells and amorphous silicon cells. Their physical properties are different, and their appearance, shape and color are also very different. The conversion rate of amorphous silicon battery is between 6% and 9%, and it is brown or translucent, which is suitable for weak light power generation places.

Second, the rear glass.

The back of its photoelectric template can also reflect the colors that designers like to adapt to different architectural styles, thus providing a new aesthetic decoration effect for modern architecture. The glass pattern effect of the back plate meets the requirements of different architectural styles and light transmittance.

Three, photovoltaic curtain wall junction box

The junction box must be anti-aging and anti-ultraviolet, with durability of 1000v, protection grade of IP65 and working temperature of -40 degrees to +85 degrees. According to the power supply of components, the needs of BIPV engineering design and the requirements of architectural aesthetics, different junction boxes are configured. Different types of junction boxes, back junction boxes and side junction boxes can be used according to actual conditions. For example, side junction boxes can be used for open frame and semi-hidden frame installation, and rear junction boxes can be used for point-supported and hidden frame installation.

The detailed explanation of photovoltaic glass curtain wall technology is here. Photovoltaic glass curtain wall is widely used in building curtain wall, photovoltaic roof, sunshade, solar power generation system and many other fields. The installation form can be open frame type, hidden frame type or various profiles with curtain walls. I hope the above content is helpful to you.