Solar street lamp, solar energy resources of light pole factory main advantages and disadvantages

Solar energy as an energy source, and fossil fuels such as coal, oil, natural gas, nuclear power, compared to has the following obvious advantages:? ( 1) Common: sun shines the earth, whether land or sea, mountains or islands, everywhere all have, can be directly open the



as an energy source, solar energy and fossil fuels such as coal, oil, natural gas, nuclear power' Is to be able to burn fossil fuels underground mineral resources. 】 Compared to, has the following obvious advantages:? ( 1) Common: sun shines the earth, whether land or sea, mountains or islands, everywhere all have, can be directly development and utilization, and needless to mining and transportation. 吗? ( 2) Harmless: the exploitation and utilization of solar energy will not pollute the environment, it is one of the most clean energy, in today's environment pollution is more and more serious, it is extremely valuable. 吗? ( 3) Huge: on the surface of the solar radiation that reaches the earth each year about 130 trillion t BiaoMei, its total current can be developed in the world's largest energy. 吗? ( 4) For a long time: according to the current produced by the sun nuclear rate estimation, hydrogen 【 Hydrogen is a kind of chemical elements in the periodic table is located in the first place. 】 Enough reserves to maintain billions of years, and the earth's life will be around for billions of years, in this sense, can be said to the sun's energy is inexhaustible. 吗? The solar energy resources are incomparable advantages of the above several aspects conventional sources of energy, but as a energy utilization, also has the following points: missing? ( 1) Dispersion: to the amount of solar radiation on the surface of the earth although very big, but can flow density 【 Energy flow density is within a certain space, per unit area ( Such as square meters) What can be achieved or unit weight ( Such as kg) Energy will have a certain energy energy or power. 】 Is very low. On average, near the tropic of cancer, in summer the weather is sunny, noon irradiance of solar radiation, the largest in the perpendicular to the direction of the sun light 1 m? 2 area receives an average of about 1 000 w solar power; If according to the annual average day and night, only 200 w left to the right. And in the winter only roughly half, cloudy day only 1/5 or so commonly, this energy flow density is very low. Therefore, in the use of solar energy, want to get a certain switching power, often require area is quite a collection and conversion equipment, made the price is higher. 吗? ( 2) Instability: by day and night, season, geographical latitude and altitude, and the natural conditions such as sunny, cloudy, cloud, rain, etc. The influence of random factors, therefore, has reached a certain ground the solar irradiance 【 Solar irradiance refers to the absorption and scattering solar radiation through the atmosphere, such as reflection effect after reach the surface of the solid earth on unit area per unit time of radiation energy. 】 Is intermittent and unstable, this increases the difficulty to the mass of solar energy application. Continuous and stable in order to make solar energy, and eventually be able to compete with conventional energy alternatives, it is necessary to well solve the problem of energy storage, namely the sunny solar radiation during the day can be stored up for the night or rainy day to use as far as possible, but the energy storage is one of the relatively weak link in solar energy utilization. 吗? ( 3) Low efficiency and high cost: the development level of the solar energy utilization, some aspects is feasible in theory, also is a mature technology. But some solar energy utilization device, because of low efficiency, high cost, in general, economy also can't compete with conventional energy. In quite some time in the future, the further development of solar energy utilization, mainly about by the economic system. 吗?