Advantages: ?
(1) Universal: The sun shines on the earth and there are no geographical restrictions. It is everywhere, no matter land or sea, no matter mountains or islands. It can be directly developed and used, and does not need to be mined and transported. ?
(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 that reaches the Earth's surface each year is approximately equivalent to 130 trillion tons of standard coal, and its total amount is the largest energy that can be developed around the world. Today. ?
(4) Long term: Based on the current rate of nuclear energy generated by the sun, hydrogen storage is sufficient to laster tens of billions of years, and life on Earth also depends on billions of years. In this sense, we can say that the energy of the sun is inexhaustible. ?
Disadvantages: ?
(1) Dispersion: Although the total amount of 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 one wishes to obtain a certain powerconversion, we often need a set of collection and conversion equipment of a considerable area, which is expensive. ?
(2) Instability: Due to the limitations of natural conditions such as day and night, season, geographic latitude and altitude, as well as the influence of random factors such as clear, cloudy, cloudy, rain, etc., when a certain ground solar radiation is reached, it is both intermittent and extremely unstable, making 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 on clear days.him. 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 solar energy utilization, some 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.
What does the sun mean in our lives?
1. Solar energy has the advantages of universality, safety, large reserves and long-term use.
(1) Universal: The sun shines on the earth, without geographical restrictions, regardless of land or sea. It can be found everywhere, whether in the mountains or on the islands, and can be directly grown and used, easy to collect, and does not require mining or transportation.
(2) Harmless: Developmental BenefitsThe use of solar energy will not pollute the environment and is one of the cleanest energy sources.
(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: According to estimates of the rate of nuclear energy produced by the sun, hydrogen storage is sufficient to last tens of billions of years, and the lifespan of Earth is also about billions of years old. In this sense, we can say that the energy of the sun is inexhaustible.THE.
1. The sun is the origin of human life; the origin of life requires energy, and the maintenance and continuation of life also requires energy. Certain temperature conditions are also necessary for the survival and sustainability of organisms. At a minimum, the water should remain liquid. The sun brings us heat and light and provides the necessary energy.
The sun can give people warmth, improve blood circulation, and promote the normal secretion of sweat and sebum. Sunlight can kill bacteria and maintain normal bacterial flora on the surface of human skin. Photosynthetic organisms form the basis of the food chain. Energy on earth is provided directly or indirectly by sunlight.
2. Many geological and meteorological disasters on earth are linked to solar activities, such as solar wind, sunspots, rashes, etc.
3. , people became aware of solar energy. For direct or indirect use, the simplest is solar water heater, then solar power generation and using solar power to drive vehicles.
Detailed information:
The Sun is currently passing through the local bubble of Orion Arm at inner edge of the Milky Way Local interstellar clouds in the region. There are 50 closest star systems within 17 light years of Earth (the closest star to the Sun is a red dwarf called Proxima Centauri, located about 4.2 light years away).
The sun is a yellow dwarf star (G2V spectrum). The lifespan of a yellow dwarf star is approximately 10 billion years. The current sun is approximately 4.57 billion years old. In about 5 to 6 billion years, the hydrogen inside the sun will almost comcompletely exhausted and the core of the sun will collapse, causing the temperature to rise. This process will continue until the sun begins to fuse helium into carbon.
Although helium fusion produces less energy than hydrogen fusion, it is also hotter, so the outer layers of the sun will expand and release some of the energy. external atmosphere in space. When the conversion to new elements is complete, the mass of the Sun will have decreased slightly and the outer layers will have extended to the current orbits of the Earth or Mars (which will then be further from the Sun due to the drop in mass of the Sun). .