Where does the energy of solar lights come from?
Solar energy generally refers to the radiant energy of sunlight, which is generally used to generate electricity in modern times. Since the formation of the earth, organisms have survived mainly by the heat and light provided by the sun. Since ancient times, humans have also known to use the sun to dry objects as a method of preserving food. However, with the reduction of fossil fuels, solar energy is deliberately developed further. There are two ways to use solar energy: passive utilization and photoelectric conversion. Solar power is an emerging renewable energy source. In a broad sense, solar energy is the source of many energy on the earth. Such as wind energy, chemical energy, potential energy of water and so on.
Solar energy is the energy produced by the continuous nuclear fusion reaction process of sunspots inside or on the sun. The average solar radiation intensity in the earth’s orbit is 1367w/㎡. The circumference of the earth’s equator is 40000km. It can be calculated that the energy obtained by the earth can reach 173,000 TW. The standard peak intensity at sea level is 1kw/㎡. The 24-hour average annual radiation intensity at a certain point on the earth’s surface is 0.20kw/㎡. Equivalent to 102000TW of energy. Human beings rely on these energies for survival, including all other forms of renewable energy.
Although the total amount of solar energy resources is equivalent to more than 10,000 times the energy used by human beings. But 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 utilization of solar energy. These characteristics of solar energy will limit its role in the entire integrated energy system.
