2012年12月25日星期二

Explain the principle of the solar panels


Sun light in a semiconductor pn junction, the formation of a new hole - electron pairs in the role of the pn junction electric field, hole by the n region to the p region, the flow of electrons from the p region n region, connected to the circuit after the formation of the current. This is a photovoltaic solar cell works.
A solar power generation solar power, there are two ways, one is light - heat - electricity conversion mode, another light - electricity direct conversion.
(1) light - heat - electricity conversion, thermal power generation through the use of solar radiation, generally by the solar cell collectors heat absorbed converted to the vapor of the working fluid, and then drive a turbine to generate electricity. A process - thermal conversion process; after a process heat - electricity conversion process, ordinary thermal power. Disadvantage of solar thermal power is inefficient and high cost of its investment is estimated at least than ordinary fire 5 to 10 times more expensive a 1000MW power station solar thermal power plants need to invest 20 to 25 billion U.S. dollars, average 1kW of investment for 2000 to $ 2500. Currently only a small scale for special occasions, while large-scale use in the economy is very uneconomical and can not compete with a conventional power plant or nuclear power plant.
(2) the direct conversion of light - electricity in this way is the use of the photoelectric effect, direct conversion of solar radiation into electrical energy, light - electricity conversion device is a solar cell. Solar cells due to the photovoltaic effect solar energy directly converted into electrical energy device, a semiconductor photodiode, when the sun light to the photodiode, the photodiode will the sun's light energy into electrical energy, producing current. When many cells are connected in series or in parallel can be relatively large output power of solar cell matrix. The solar cell is a promising new type of power, has a permanent, clean and flexibility three advantages of solar cells and long life, as long as there is sun, the solar panel can be an investment in long-term use; thermal power, nuclear power generation compared to the solar cell does not cause environmental pollution; solar cells can be medium and small simultaneously, large million kilowatt medium-sized power plants, small for a solar battery pack, which is unmatched by other power. To give priority to the development of solar energy, the Jordanian government announced that the country's first feed-in tariff scheme solar feed-in tariff subsidies per kW / 120 fils ($ 0.17). The government enacted a new initiative dedicated to the development of clean renewable energy, help to reduce the proportion of imported energy, so as to ease the financial difficulties. The policy will also Jordan's own installation system to provide 15% of domestic subsidies.
The Jordanian government said that the best way to reduce the demand for electricity and the cost is to encourage people to use solar energy to individuals and small and medium-sized businesses can save 32-70% of their monthly bill.
Earlier this year, the Jordanian government has agreed to the construction of solar power plants, plans up to 39% from 4% in 2007 to 2020, the proportion of renewable energy sources to total energy structure. Currently, the government spent on energy subsidies of up to $ 1.7 billion, resulting in a budget deficit climbed to $ 3.1 billion. Meanwhile, solar, wind and other clean energy accounted for only 1% of the national energy supply, well below the government energy planning goals, by 2020, new energy generating capacity accounts for about 10% of the total energy.

没有评论:

发表评论