Solar energy as a kind of green energy, has its advantages and disadvantages.The following simple introduction for everyone under the characteristics of the solar energy.
Advantages common:
(1) the sun shine, no regional restrictions whether land or sea, mountains or islands, everywhere all have, can be directly development and utilization, and need not mining and transportation.
(2) harmless: the development 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.A huge
(3) each year on the surface of the solar radiation that reaches the earth or the equivalent of about 130 trillion tons of coal, the total current can be developed in the world's largest energy.(4) for a long time: according to the current produced by the sun nuclear rate estimation, the hydrogen capacity enough to maintain billions of years, and the life of the earth is about for billions of years, in this sense, it can be said that the sun's energy is inexhaustible.
Disadvantages common:
(1) to the amount of solar radiation on the surface of the earth although is very big, but can flow density is very low.On average, near the tropic of cancer, in summer the weather is sunny, noon radiation of solar radiation, the largest in the direction perpendicular to the sunlight 1 square meter area receives an average of about 1000 w solar power;If according to the annual average day and night, only about 200 w.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, cost is higher.
(2) the instability due to the 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 radiation is intermittent, it is 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 during the day the sun radiant energy stored as far as possible, for the night or rainy day, but at the moment, energy storage is one of the relatively weak link in solar energy utilization.
(3) the low efficiency and high cost: the development level of the solar energy utilization, some aspects is feasible in theory, technology is mature.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, is mainly restricted by economy.
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