Analysis of the advantages and disadvantages of solar energy

Everything has a good side and a bad side. For solar street lights, it is only gradually suitable for use after continuous improvement. For many solar products in our country, when using solar energy as power, we should also pay attention to the advantages and disadvantages of solar energy. Advantages (1) Universal: The sun shines on the earth, and there are no geographical restrictions. No matter whether it is land or sea, no matter whether it is mountains or islands, it is everywhere. It can be directly developed and utilized by solar monocrystalline silicon, and there is no need for mining and transportation. (2) Harmless: The development and utilization of solar energy will not pollute the environment, it is one of the cleanest energy sources, which is extremely valuable in today's increasingly serious environmental pollution. (3) Huge: The solar radiation energy reaching the earth's surface every year is equivalent to about 130 trillion tons of coal, and its total amount is the largest energy that can be developed in the world today. (4) Long-term: According to the current rate of nuclear energy generated by the sun, the storage of hydrogen is enough to last for tens of billions of years, and the life of the earth is also about several billion years. In this sense, it can be said that the energy of the sun is used for inexhaustible. Disadvantages (1) Dispersion: Although the total amount of solar radiation reaching the earth's surface is very large, the energy flux density is very low. On average, near the Tropic of Cancer, when the weather is relatively clear in summer, the irradiance of solar radiation is the largest at noon, and the average solar energy received on an area of u200bu200b1 square meter perpendicular to the direction of sunlight is about 1000W; On an average day and night, it is only about 200W. In winter, it is only about half, and cloudy days are generally only about 1/5, so the energy flux density is very low. Therefore, in order to obtain a certain conversion power when using solar energy, a set of collection and conversion equipment with a considerable area is often required, and the cost is relatively high. (2) Instability: Due to the limitations of natural conditions such as day and night, seasons, geographic latitude and altitude, and the influence of random factors such as sunny, cloudy, cloudy, and rainy, the solar irradiance reaching a certain ground is intermittent. It is extremely unstable, which increases the difficulty of large-scale application of solar energy. In order to make solar energy a continuous and stable energy source, and finally become an alternative energy source that can compete with conventional energy sources, the problem of energy storage must be well solved, that is, the solar radiation energy during the sunny day should be stored as much as possible for nighttime or rainy weather. However, energy storage is also one of the weakest links in solar energy utilization. (3) Low efficiency and high cost: The current development level of solar energy utilization is theoretically feasible in some aspects and technically mature. However, due to the low efficiency and high cost of some solar energy utilization devices, in general, the economy cannot compete with conventional energy sources. For a considerable period of time in the future, the further development of solar energy utilization will be mainly restricted by economics.