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Roger Angel used a dozen of mirrors with a length of about 3.3 meters to create a prototype of a solar generator.
This machine looks a bit like a huge box-shaped kite. A white steel frame holds a square giant mirror. The steel frame is mounted on a turret that can track the sun's trajectory.
This design reflects at least 90% of sunlight's energy, up to or up to 98%, and does not generate pollution during operation.
Power generation is not the roster of Roger Angel. He is a professor of astronomy and optics at the University of Arizona. He is a pioneer in the optical world and a master of playing with mirrors. He invented a new method of manufacturing a telescope, which produced a large mirror area and precise imaging. Now, he has also slightly improved the technique of gathering stars to collect sunlight, hoping to increase the utilization of solar energy. To reduce costs.
The key to Angel's invention is focusing; the key to focusing is on the concave mirror.
Angel has a "mirror lab" at the University of Arizona. Here, he and his colleagues created a large number of mirrors with a length and width of 11 feet (approximately 3.3 meters). The method used was called "rotary firing."
How to make a mirror with a large surface area has always been a problem faced by mirror makers. Angel addressed this problem by giving the mirror a hollow honeycomb structure. He puts the glass slag into a huge mold and puts the mold in a huge rotary furnace for heating. When the temperature in the furnace reached 1149 degrees Celsius, the glass melted into a liquid and broke into the mold. As the air circulates in the light honeycomb structure, the glass can be thermally balanced in a short time. The reason why he chooses to use a rotary furnace is that in the rotation, the glass will naturally form a paraboloid, so as to achieve the effect of gathering light.
It takes a year to create such a giant mirror. To date, the laboratory has created dozens of honeycomb giant mirrors. Using these mirrors, Angel has built a prototype of solar power in an abandoned swimming pool in the university. This machine looks a bit like a huge box-shaped kite. A white steel frame holds up a square giant mirror. . The steel frame is mounted on a turret that can track the sun's trajectory. In order to save costs, ordinary window glass is used, but one side is painted silver and treated as a mirror. The mirror is concave and collects sunlight on photovoltaic cells. Sunlight is gathered to make solar cells more efficient when converting light energy into electricity. It is estimated that this design can reflect at least 90% of the sunlight's energy, the highest or up to 98%. Throughout the design, only the turret that tracks the position of the sun can be moved. The device emits a slight "whiplash" during operation and no pollutants are produced.
So far, this prototype has only been able to emit a few kilowatts of electricity, but Angel pointed out that these electric energy can already be put into practical use: “You can use it to charge electric cars. Imagine driving a solar-powered car in the city. Roaming inside, it should feel pretty bad."
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