The hottest high-end photovoltaic curtain wall bec

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High end PV curtain wall becomes the direction of internal transformation of curtain wall industry

with the intensification of competition in the traditional curtain wall industry, the industry profit margin is diluted and the threshold is reduced. High end PV curtain wall has become the direction of internal transformation of curtain wall industry

in March this year, Buffett's Mitek Group acquired Benson Industrial Co., Ltd., which makes curtain walls. Buffett's investment endorsement makes the investment prospect of curtain wall industry more clear

in the curtain wall industry, photovoltaic curtain walls with power generation function are also particularly attractive. In 2010, China's existing urban and rural construction area reached 45billion square meters, of which more than 99% were high-energy consuming buildings. Therefore, the prospect of building energy-saving construction and transformation is very broad

taking into account the demand for lighting and power generation

photovoltaic curtain walls are usually curtain wall materials formed by placing photovoltaic modules between two layers of glass. In addition to the power generation characteristics, it has the same architectural characteristics as other curtain walls

it is understood that there are two main technical modes of PV curtain wall at present. One is crystalline silicon curtain wall and the other is amorphous silicon curtain wall. The photovoltaic module of the former is made of polycrystalline silicon or monocrystalline silicon, which has the advantages of high photoelectric conversion efficiency, small installation size, and mature production materials and technologies. However, the disadvantage is that the curtain wall has poor light transmittance and poor performance under high temperature and weak light conditions

the photoelectric curtain wall developed in the early stage is the extension of the photoelectric roof on the curtain wall, but the facade of the curtain wall has higher lighting and aesthetic standards than the roof, so it puts forward higher light transmission requirements for the original crystalline silicon materials

compared with crystalline silicon curtain wall, amorphous silicon is relatively late in development and its photoelectric conversion efficiency is lower than that of crystalline silicon material, but the photovoltaic module thin film cells used in amorphous silicon curtain wall have good light transmittance and can also play a role under high temperature and weak light conditions. Compared with the single appearance color of crystalline silicon curtain wall components, amorphous silicon curtain wall components can better integrate with the building facade without affecting the appearance effect of the building, and have also become a new focus of market attention

in addition, the lighting conditions in different parts of China are different. In the past, the photoelectric curtain wall was mainly designed to adapt to different lighting conditions through the inclined wall design. Up to now, according to the relatively flexible characteristics of thin-film batteries, the maximum light utilization can also be realized directly through the inclined inlay in the glass interlayer

for example, the Zhongjian building in Changsha is a building with thin-film photoelectric curtain walls. In the glass curtain wall at the top, an amorphous silicon thin film battery is embedded in the glass in the shape of a hundred pages. The narrow louver design enables the modular design battery of the membrane rausberg prefabricated building to achieve a greater tilt angle, and does not affect the indoor lighting and the indoor view

lishuishui, chief engineer of China Construction Fifth Engineering Bureau, said that the self-designed photoelectric curtain wall has a building area of about 2000 square meters and an annual power generation of about 100000 kwh, which can basically meet the lighting power consumption of the public part of the entire China Construction building

policy dependence is still large

at present, the annual use area of building curtain walls in China has exceeded 70million square meters, but in addition to considering the mechanical properties of the parts. In Li's opinion, if the PV curtain wall can reach 10% of the promotion area, the annual power output will be equivalent to 10 medium-sized thermal power stations, and the carbon dioxide emission will be reduced by about 4million tons

within the industry, with the intensification of competition in the traditional curtain wall industry, the profit margin of the industry is diluted and the threshold is lowered. High end photovoltaic curtain wall has become the direction of internal transformation of the curtain wall industry

take AVIC Sanxin in the curtain wall industry as an example, they have already taken the photoelectric curtain wall as one of the main transformation channels. Industrial solar in Zhuhai has also shifted its business focus from traditional curtain wall business to photovoltaic building integration project year by year, and the gross profit margin of the latter is almost twice that of the former. According to the financial report of Societe Generale solar, as of the first half of this year, the revenue share of the photovoltaic building integration project of Societe Generale has increased from 39.5% in the same period last year to 48.1%

however, nationwide, the promotion of photoelectric curtain wall is still very limited due to the direct connection with motor and the change of lead screw with the change of motor. Li shuihui believes that the reason is that developers have not fully accepted the cost of photoelectric curtain wall, and the whole industry is greatly affected by the national photovoltaic subsidy policy

generally speaking, the cost of ordinary curtain walls with PV modules is about twice that of the original. Lishuishui said that in order to encourage the development of photovoltaic buildings, the government used the total investment method to calculate the subsidy for photovoltaic buildings. The subsidy amount is about half of the increased cost of Installing Photovoltaic Modules on curtain walls. However, the government subsidy is also declining after the price of photovoltaic modules has dropped, Therefore, Xu Xu, deputy director of the Chemical Department of IHS Markit, a curtain wall produced by CSCEC, said: "if the consumption of polyurethane foam is determined by the location, the increased cost of Installing Photovoltaic modules is still 1300~1400 yuan/m2, and the payback period of power generation income is 15 ~ 16 years. Therefore, developers are not willing to choose photoelectric curtain walls for such a long payback period, and the whole industry is still highly dependent on government subsidies.

In several opinions of the State Council on promoting the healthy development of photovoltaic industry, the state continues to encourage the full use of solar energy in the process of urbanization, strengthen the application of photovoltaic power generation in combination with building energy conservation, and promote the integrated construction of photovoltaic buildings. However, the specific support rules still need to be further clarified by the government

in addition to the government's policy support, Li shuihui also suggested that photovoltaic curtain wall enterprises should develop photovoltaic photothermal products as soon as possible, because only relying on the current low photoelectric conversion efficiency to use solar energy for power generation actually loses the use of a large amount of photothermal energy, while the photovoltaic photothermal integration system can greatly reduce building energy consumption and increase the use interest of developers. Zhonghua glass () Department

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