1、英文原文 Historical Review of Solar Energy Solar generally refers to the suns radiation energy. Carried out in the solar interior from H together into a helium the nuclear reaction, kept a huge release of energy, and continue to the space radiation energy, which is solar energy. This solar nuclear fusio
2、n reaction inside the can to maintain the hundreds of millions of first time. Solar radiation to space launch 3.8x10 23kW power of the radiation, of which 20 billionth of the Earths atmosphere to reach. Solar energy reaching the Earths atmosphere, 30% of the atmosphere reflectance, 23% of atmospheri
3、c absorption, and the rest to reach the Earths surface. Its power of 80 trillion kW, that is to say a second exposure to the suns energy on Earth is equivalent to five million tons of coal combustion heat release. The average per square meter in the atmosphere outside the area of energy per minute t
4、o receive about 1367w. A broad sense of the solar energy on earth many sources, such as wind energy, chemical energy, potential energy of water and so on. The narrow sense is limited to solar radiation of solar light thermal, photovoltaic and photochemical conversion of the directly. At this stage,
5、the worlds solar energy is still the focus of the study of solar energy power plant, but the diversification of the use of the condenser, and the introduction of flat-plate collector and a low boiling point working fluid, the device gradually expanded up to maximum output power 73.64kW, Objective To
6、 compare the clear and practical, cost remains high. The construction of a typical device are as follows: 1901, California built a solar-powered pumping devices, the use of truncated cone condenser power: 7.36kW； 1902 1908 years, built in the United States five sets of double-cycle solar-powered eng
7、ines, the use of flat-panel collector and a low boiling point working fluid； in 1913, Human use of solar energy has a long history. China more than 2000 years ago, back in the Warring States period, one will find that the use of four steel mirror to focus sunlight ignition； use of solar energy to dr
8、y agricultural products. The development of modern, solar energy has become increasingly widespread use, it includes the use of solar energy solar thermal, solar photovoltaic and solar energy use, such as the photochemical use. The use of solar photochemical reaction, a passive use (photo-thermal co
9、nversion) and the photoelectric conversion in two ways. A new solar power and renewable sources of energy use. Silicon photovoltaic cells mainly in the absorption of solar light energy emitted by silicon photocell is mainly extracted from the sand by the development of Bell Labs. Solar energy is the
10、 internal or the surface of the sun sunspot continuous process of nuclear fusion reactions produce energy. Earths orbit on the average solar radiation intensity for the 1367w / . Circumference of the Earths equator to 40000km, and thus calculated the Earths energy can be obtained 173000TW. At sea le
11、vel standard for peak intensity 1kw/m2, a point on the Earths surface 24h of the annual average radiation intensity 0.20kw / , which is equivalent to have 102000TW energy Human dependence on these energy to survive, including all other forms of renewable energy (except for geothermal energy resource
12、s), although the total amount of solar energy resources is the human equivalent of the energy used by ten thousand times, but low energy density of solar energy, and it vary from place to place, from time to time change, the development and utilization of solar energy which is facing a major problem
13、. These features will make solar energy in the integrated energy system of the role of subject to certain restrictions. The use of solar cells, through the photoelectric conversion to solar energy conversion is included in electricity, the use of solar water heaters, the use of solar heat hot water
14、and use water for power generation, using solar energy for desalination. Now, the use of solar energy is not very popular, the use of solar power costs are high there, the problem of low conversion efficiency, but for satellite solar cells to provide energy has been applied. Although the Earths atmo
15、sphere solar radiation to the total energy only 22 billionths of a radiation energy, it has been as high as 173,000 TW, that is to say a second exposure to the suns energy on Earth is equivalent to five million tons of coal. Earth wind energy, hydropower, ocean thermal energy, wave energy and tidal
16、energy as well as some comes from the sun； even in the face of the earths fossil fuels (such as coal, oil, natural gas, etc.) that is fundamentally Since ancient times the storage of solar energy down, so by including a broad range of solar energy is very large, he narrow sense is limited to solar r
17、adiation of solar light thermal, photovoltaic and photochemical conversion of the directly. Solar energy is the first time, but also renewable energy. It is rich in resources, can use free of charge, and without transportation, without any pollution to the environment. For mankind to create a new li
18、fe, so that social and human energy into a era of reducing pollution. Solar cells have to respond to a light and convert solar energy to power the device. Photovoltaic effect can produce many kinds of materials, such as: single crystal silicon, polycrystalline silicon, amorphous silicon, gallium ars
19、enide, copper indium selenium. They are basically the same principle of power generation is now crystal as an example to describe the process of light generation. P-type crystalline silicon available after phosphorus-doped N-type silicon, the formation of P-N junction. When the surface of solar ligh
20、t, the silicon material to be part of photon absorption； photon energy transfer to the silicon atom, electronic transitions have taken place, as a free-electron concentration in the PN junction formed on both sides of the potential difference, when the external circuit connected when the effects of
21、the voltage, there will be a current flowing through the external circuit have a certain amount of output power. The substance of this process are: photon energy into electrical energy conversion process. Si is our planets abundance of storage materials. Since the 19th century, scientists discovered the properties of crystalline silicon semiconductor, it almost
