Sunlight shines on the p-n junction of the semiconductor, forming new hole-electron pairs. Under the action of the electric field of the p-n junction, holes flow from region n to region p and electrons flow from region p to region n. . Once the circuit is turned on, create an electric current. This is how photovoltaic solar cells work.
nbsp;?With the continuous improvement of modern living standards, the use of nature has also reached its extreme, and the sun has also become the backbone of our lives. the sun is essential in life. Whether it is a lighting lamp or a water heater, it has a solar mode. So what is the principle of solar power generation?
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Methods of producing solar energy There are two methods of producing solar energy, the one being light, heat and electricity. mconversion method, and the other is the direct light-electricity conversion method.
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(1) The light-heat-dynamic-electricity conversion method generates electricity using thermal energy generated by solar radiation. Generally, the thermal energy absorbed is converted by one. solar captor. The steam is converted into working fluid and then drives the steam turbine to produce electricity. The first process is a process of converting light into heat; the second process is a conversion of moving heat into electricity and the final conversion process, which is the same as ordinary thermal power generation. The disadvantages of solar thermal power generation are as follows. that the yield is very low and the cost is very high. Its investment is estimated to be at least 5 to 10 times more expensive than ordinary thermal power plants.
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(2) Methode direct conversion of light into electricity This method uses the photoelectric effect to directly convert the energy of solar radiation into electrical energy. The basic device for light in electricity. electricity conversion is the solar cell. A solar cell is a device that directly converts solar energy into electrical energy through the photovoltaic effect. When the sun shines on the photodiode, the photodiode converts light energy from the sun into electrical energy, producing current. When many batteries are connected in series or parallel, a solar cell array with relatively large output power can be formed. Solar cells are a promising new energy source with three major advantages: Solar cells have a long lifespan and can be invested once and used for a long time as long as the sun exists by rapportion to the production of thermal energy. the cells do not cause environmental pollution.
Sunlight shines on the p-n junction of the semiconductor, forming new hole-electron pairs. Under the action of the electric field of the p-n junction, holes are formed. formed by Area n flows to area p and electrons flow from area p to area n When the circuit is connected, a current is formed. This is how photovoltaic solar cells work. 1. Solar power generation methods There are two solar power generation methods, one is light-heat-electricity conversion method and the other is direct light-electricity conversion method. (1) The light-heat-electricity conversion method generates electricity using thermal energy generated by solar radiation. Generally, a solar collector converts thermal energy intobsorbed into steam as the working fluid, then drives a steam turbine to produce electricity. The first process is light—Thermal conversion process; the latter process is the process of converting heat into electricity, which is the same as ordinary thermal power generation. The disadvantages of solar thermal power generation are that its efficiency is very low and its cost is very high. estimates that its investment is at least 5 to 10 times more expensive than ordinary thermal power plants. A 1,000 MW solar thermal power plant requires an investment of 2.0 to 2.5 billion US dollars, and the average investment for 1 kW is 2,000 to 2,500 US dollars. Therefore, it can only be used on a small scale on special occasions, and large-scale use is not economically profitable and cannot compete with ordinary thermal or nuclear power plants. (2)Direct light-to-electricity conversion method This method uses the photoelectric effect to directly convert solar radiation energy into electrical energy. The basic device for converting light into electricity is the solar cell. A solar cell is a device that directly converts solar energy into electrical energy through the photovoltaic effect. When the sun shines on the photodiode, the photodiode converts light energy from the sun into electrical energy, producing current. When many batteries are connected in series or parallel, a solar cell array with relatively large output power can be formed. Solar cells are a promising new energy source with three major advantages: Solar cells have a long lifespan and can be invested once and used for a long time as long as the sun exists, theyare different from the production of thermal energy; and nuclear energy production. In comparison, solar cells do not cause environmental pollution; Solar cells can be used in both large, medium and small sizes, ranging from medium-sized million-kilowatt power plants to small solar batteries for a single household. . It is a panel raw material that other power sources cannot match: glass, EVA, cells, aluminum alloy shells, tin-plated copper sheets, stainless steel brackets, batteries, etc.
Solar water heaters convert solar energy. energy into thermal energy, heating water from low temperature to high temperature to meet the needs of people who use hot water in life and production. Solar water heaters are composed of heat collecting tubes, water storage tanks and accessoriesassociates. The conversion of solar energy into thermal energy mainly relies on heat collecting tubes. The surface temperature of the collector exposed to sunlight is high and the temperature of the back of the collector tube is low, and the water in the tube produces a temperature difference reaction. The principle of hot water flotation and cold water sinking is used. to cause microcirculation of water to achieve the required hot water.
The operating principles of solar panels and solar water heaters are quite different. The only thing they have in common is that they both absorb solar energy.