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A revolutionary plan to improve the conversion rate of solar energy: concentrated photovoltaic solar energy

alternative energy clock on May 6 of Nandu weekly is a shocking counter. The rapidly flipping figures record the real-time global oil consumption and carbon dioxide emissions - carbon emissions have increased by nearly 400000 tons since logging on to that page 15 minutes ago to writing this paragraph - it takes more than 3 million fir trees growing for 30 years to offset

low carbon cannot be just a slogan and budget. The four words "adjusting measures to local conditions" determine the priority of each country to develop a new energy technology. Just as Spain, the United States and Australia, which have plenty of sunshine, are accelerating the application of solar energy technology

as a natural resource, pollution-free solar energy has long been studied by scientists as well as renewable resources such as wind energy, geothermal energy and tides. The principle of this technology is not complex, but its bottleneck - the efficiency of energy conversion has always been the focus of scientists all over the world

silicon, an expensive semiconductor, determines efficiency. At present, the theoretical maximum photoelectric conversion efficiency of silicon-based solar cells is only 30%. Taking monocrystalline silicon as an example, its maximum photoelectric conversion rate in the laboratory reached 24.7%, but it fell to about 15% in practical application after mass production

this is because the wavelength of the solar spectrum reaching the ground covers nanometers. Traditional silicon-based solar cells can only absorb sunlight with a wavelength less than 1100 nm, and the rest is reflected, causing a lot of waste

at present, there are many revolutionary solutions in the academic community, which can greatly improve the conversion rate - depending on what material is used to absorb sunlight. With the comprehensive cost and technological maturity, concentrated photovoltaic solar energy (hereinafter referred to as CPV) is becoming a popular fried chicken

the core of CPV is multijunction solar cells, which stack high, medium or low energy gap solar cells in series from the direction of sunlight incidence into three junction solar cells in order to absorb the high and long wavelength sunlight required by many short, medium and current production enterprises for the quality of equipment. From the battery model provided by Iqe company in the UK, we can see that the upper unit of the multi junction battery is InGaP (indium gallium phosphide), the middle unit is InGaAs (indium gallium arsenic), and the bottom unit is Ge (germanium), which improves the efficiency to 40%

this efficient multi junction solar cell requires a lens or mirror to magnify the received solar energy hundreds or thousands of times, and then focus the amplified energy on it

take solfocus, an American company, as an example. The basic unit of its CPV power generation model is a system composed of two mirrors. In the system, sunlight is led to a photocell with an area of only 1 square centimeter in our environment through a photosensitive rod. A solar panel consists of many such units, and the solar panel placed on the tracking device can rise and fall in the East and West with the change of the sun's position

cpv is commendable in that it uses less optoelectronic materials than traditional optoelectronic technology. More importantly, compared with traditional solar energy technology, the amount of water used for cooling is greatly reduced

most ways of producing energy use water. In a collector solar power plant, mirrors (reflecting sunlight) heat the liquid to produce steam, which drives the turbine of the generator to generate electricity. Like thermal power plants, such steam must be condensed into water and reused

the water consumption of traditional solar technology is as high as 3217 liters per 1000 kwh, while CPV technology only consumes 15 liters per 1000 kwh, which has obvious advantages

in April this year, KPCB, one of the largest venture capitalists of Jinan era bone screw torsion testing machine, led a heavy investment of US $129 million in amonix company in Southern California, which has been committed to developing CPV technology for 20 years

solfocus, amonix's opponent, is not idle. Last month, the company began to build a megawatt CPV solar power plant in the northern desert of Los Angeles, which will supply power to a local community university. As far away as Australia, solfocus has also received a government order to build a 235 kW solar power plant, including 28 CPV arrays, for the northern Australian airport "Alice Spring"

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