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How much solar energy is available for solar garden lights?
时间:2018-12-18 浏览:653次

Guide: Solar lights are now more and more popular, outdoor solar lights now have solar garden lights, solar lawn lights. The price of solar lights is also very affordable. The emergence of solar floodlights has made environmental protection without electricity a reality.

On earth, although there are nights and nights, the sun shines on the earth all the time. That being said, not all solar energy can come to Earth. The energy of the sun is emitted in all directions in the form of light, dissipating energy into the space of the universe.

      The orbit of the earth orbiting the sun is elliptical, and the distance between the sun and the earth is very long. The average distance is about 1.495×10°km (the farthest distance and the closest distance are 1.52×108km and 1.47×105km respectively); for the universe It is said that the earth is very small, so the earth receives very little solar energy, and most of the solar energy is emitted into the universe. Based on the size and relative position of the Earth and the Sun, it can be known that only 200 million of the total solar radiation reaches the upper boundary of the Earth's atmosphere, which is about 1.73 × 1012 kW.

      Be aware that this is only the upper bound of the Earth's atmosphere, not the amount of solar energy that is obtained from the Earth's surface. When the energy of solar radiation passes through the atmosphere, it is absorbed by the water vapor, carbon dioxide, dust, oxygen and ozone in the atmosphere, as well as the absorption, scattering and reflection of cloud droplets, fog, ice, and air molecules, so that it is projected onto the upper boundary of the atmosphere. The solar radiation does not reach the ground completely.

      When solar energy reaches the upper boundary of the Earth's atmosphere, it will reflect when it encounters air molecules, dust particles, cloud droplets and other particles. According to statistics, 30% (about 51.9×102 kW) of solar energy radiated by solar energy is reflected in the universe in the form of light, and only 70% (121.1×101 kW) enters the atmosphere. Looking at the Earth from a spaceship, it is very clear that the Earth with high reflectivity and the Earth of clouds, when the sun's rays traverse the atmosphere, some of the elements in the atmosphere have the property of selectively absorbing radiation at a certain wavelength. This has been confirmed by the blue light in the atmosphere. The components that absorb solar radiation are mainly water vapor, oxygen, ozone, carbon dioxide and solid impurities. When the solar radiation is absorbed by the atmosphere, it becomes heat energy, thus weakening the solar radiation. Therefore, 20% of the solar energy entering the atmosphere (about 14% of the total solar energy radiated by the sun to the Earth) is scattered or absorbed by the atmosphere, only about 80% of which (about 56% of the total amount of solar energy radiated by the sun to the Earth). %) More solar energy passes through the atmosphere and eventually reaches the surface of the earth. Due to the scattering and absorption of the atmosphere, the solar radiation power that finally reaches the Earth's surface is about 96.88 × 1012 kW. This is too insignificant compared to the total solar radiant energy, but in fact it is still hundreds of thousands of times the global generating capacity.

      In summary, we don't have to worry about the exhaustion of solar energy. The current solar energy development is also very rapid. The conversion efficiency, utilization rate and penetration rate of solar energy are still the focus of our concern. The research and development of solar lights such as solar garden lights and solar lawn lights are more and more in line with the people's living needs and political environmental protection.

     nuusolar will continue to develop cost-effective solar lights for the needs of the people!

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