Solar energy is not the most efficient source of energy.
The total amount of solar energy resources is equivalent to more than 10,000 times the energy used by humans. However, the energy density of solar energy is low and it varies from place to place and from time to time. This is the main problem facing the development and use of solar energy. These characteristics of solar energy will limit its role in the entire integrated energy system.
The use of solar energy is not yet very popular. There are still problems with using solar energy to generate electricity, such as its high cost and low conversion efficiency. However, solar cells have been used to provide power. artificial satellites.
Detailed information:
Disadvantages of solar energy
1 Dispersion
Although the total amount of solar radiation reaching the Earth's surface is large. , But the energy flow density is very low. Therefore, when using solar energy, if we want to obtain a certain conversion power, we often need a set of collection and conversion equipment with a considerable area, which is expensive.
2. Instability
Due to limitations of natural conditions such as day and night, season, geographic latitude and altitude, as well as random factors such as clear, cloudy, cloudy, and rain , solar irradiation reaching a certain ground is both intermittent and extremely unstable, making large-scale application of solar energy more difficult.
3. Low efficiency and high cost
With the level of development of the use ofsolar energy, certain aspects are theoretically feasible and technically mature. However, some solar energy utilization devices have low efficiency and high cost, and the current laboratory use efficiency does not exceed 30%. In general, the economy cannot compete with conventional energy.
4. Pollution from solar panels
Solar panels have a certain lifespan. Typically, they need to be replaced every 3 to 5 years at most, and replaced solar panels are very difficult to replace. be destroyed. Nature breaks it down, causing considerable pollution.
Baidu Encyclopedia - Solar Energy
The sun's energy comes from what it contains
Advantages (1) Universal: The sun shines on the earth and there are no geographical restrictions, whether on land or sea, on mountains or on islands. It can be directly developed and used without requiring mining or transportation. (2) Harmless: The development and use of solar energy will not pollute the environment. It is one of the cleanest sources of energy, which is extremely valuable today as environmental pollution becomes more and more serious. (3) Huge: The energy of solar radiation reaching the Earth's surface each year is equivalent to about 130 trillion tons of coal, and its total amount constitutes the largest energy that can be developed in the world today. (4) Long-term: Based on the current rate of nuclear energy produced by the sun, the storage of hydrogen is enough to last for tens of billions of years, and the lifespan of the Earth is also long-term. 'about several billion years., in this sense, we can say that the energy of the sun is inexhaustible.
Disadvantages
(1) Dispersion: Although the quantitytotal solar radiation reaching the Earth's surface is 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 greatest at noon. The average solar energy received in an area of 1 square meter perpendicular to the direction of sunlight is approx. 1000W if total averaged day and night throughout the year, that's only about 200W. In winter it is only about half, and on cloudy days it is usually only about 1/5. This energy flow density is very low. Therefore, when using solar energy, if we want to obtain a certain conversion power, we often need a set of collection and conversion equipment with a considerable area, which is expensive. (2) Instability: due to limitations of natural conditions such as day andnight, season, geographic latitude and altitude, as well as the influence of random factors such as clear weather, cloudy weather, clouds and rain, solar irradiation reaches a certain level. Some soils are intermittent and extremely unstable, which makes the large-scale application of solar energy more difficult. In order to make solar energy a continuous and stable energy source and ultimately become an alternative energy source that can compete with conventional energy sources, the problem of energy storage must be well solved , that is, the energy of solar radiation during clear days should be stored as much as possible for use at night or when it rains. It is used for everyday use, but currently energy storage is also one of the weakest links in solar energy use. (3) Low efficiency and high cost: At the current level of development of the uUsing solar energy, certain aspects are theoretically feasible and technically mature. However, some devices using solar energy have low efficiency and high cost. Generally speaking, the economy cannot compete with conventional energy sources. For a considerable period, the future development of the use of solar energy will be limited mainly by economic reasons.
The sun's energy comes from the nuclear fusion reaction that occurs inside it.
At the core of the Sun, hydrogen nuclei undergo fusion reactions at extremely high temperatures and pressures to generate helium nuclei and release energy. This process is called nuclear fusion.
The nuclear fusion reaction is the main source of the enormous energy that the sun continues to emit. Inside the sun, hydrogen nucleicollide and merge into helium nuclei. The mass lost during this process is converted into energy and released. This energy is transferred to the surface of the sun in the form of radiation and is emitted into the solar system, including Earth, in the form of light and heat.
The energy production of the sun has a significant impact on the environment and the terrestrial ecosystem. Once solar energy radiation reaches the Earth, it is absorbed and reflected by the Earth's atmosphere and surface, thereby forming the Earth's climate and ecological environment. Stable solar energy production plays a critical role in maintaining the stability of Earth's climate and ecosystems.
The sun's energy is also widely used by humans, notably for the production of electricity, heating, maritime transport, agriculture and the management of water resources. Solar energy is professional energypre and renewable which is of great importance in reducing dependence on fossil fuels and reducing environmental pollution.
Characteristics of solar energy:
1. Infinite: The sun's energy source is infinite. As long as the sun burns, it will continue to produce energy. This infinity makes solar energy a reliable long-term energy source.
2. Environmental protection: Solar energy is an environmentally friendly energy source that does not produce harmful waste gases, sewage, etc., nor does it cause environmental pollution . The use of solar energy helps reduce damage to the environment and protect the ecological balance.
3. High efficiency: Solar energy has high energy density and high energy conversion efficiency compared to other energy sources. Under the same conditions, the proSolar energy production is superior to traditional electricity generation methods.
4. Convenience: Solar energy is a ubiquitously available energy source and does not require complex transportation and storage facilities. The installation and use of solar equipment is also relatively simple, convenient and quick.
5. Dependence: The use of solar energy is affected by factors such as geographical location, climatic conditions and weather. If the geographical location is not good or the climatic conditions are unfavorable, solar energy production. will be affected.