Gao Yanfeng, a professor at Shanghai University and a part-time researcher at the Shanghai Institute of Ceramics, Chinese Academy of Sciences, has recently developed an "intelligent power generation window." It can use sunlight to generate electricity, and also automatically insulate according to temperature changes. The scientific report published the research results online.
Gao Yanfeng said that vanadium dioxide is a material with structural phase transition characteristics. Under high and low temperature conditions, its chemical structure is completely different. When the temperature is below 68 ° C, vanadium dioxide is a transparent insulator that allows infrared rays to pass through; when the temperature is above 68 ° C, vanadium dioxide becomes a metal, which reflects infrared rays.
Sunlight is divided into three parts: ultraviolet, visible, and infrared. Among them, ultraviolet rays are harmful to the human body, and vanadium dioxide can absorb 97% of ultraviolet rays; for visible light, this material allows it to pass through, so it is attached to windows without affecting daylighting; for the main source of heat energy-infrared, two Vanadium oxide will reflect it at high temperatures to provide thermal insulation, and at low temperatures will allow it to penetrate and introduce heat. "We can process the vanadium dioxide material to change its critical temperature for phase transition. For example, set the critical temperature to 30 ℃, so that after attaching it to the window, when the outdoor temperature exceeds 30 ℃, the window will automatically reflect Infrared has the effect of heat insulation. "Gao Yanfeng said.
After long-term research and development, Gao Yanfeng's team has prepared a large-size vanadium dioxide film by wet chemical method for the first time in the world, and on this basis, trial-manufactured a wide temperature control intelligent energy-saving film product with independent intellectual property rights. After comparative evaluation, the high-temperature insulation performance of this product is better than imported products, the phase change characteristics are stable, and the estimated price is only 1/2 to 1/5 of foreign products.
It is reported that the "smart window" will be put into production next year. Recently, Gao Yanfeng installed solar cells on the "smart window", which successfully upgraded it to a "smart window".
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