Solar energy have how old?

Solar energy is the sun continuously in the process of nuclear fusion energy. Solar irradiance (average on the earth's orbit The radiation intensity) Is 1367 kw/m2. The circumference of the earth's equator is 40000 km, which can be calculated. The earth energy 173000 tw. In the

solar is inside the sun continuously in the process of nuclear fusion energy. Solar irradiance (average on the earth's orbit The radiation intensity) Is 1367 kw/m2. The circumference of the earth's equator is 40000 km, which can be calculated. The earth energy 173000 tw. On sea level for 1 kw/m2 standard peak intensity, the surface of the earth at some point 24 h average irradiance for 20 kw/m2. Equivalent to 102000 tw energy, human depend on the energy d for survival. The sun is a huge, long and endless energy. Although the solar radiation energy to the earth's atmosphere, only for his total radiation energy, Is about 3. One over two billion two hundred million of the 865 x1086w ', but has been as high as 173000 tw, that is to say the sun light to the earth every second energy is equivalent to 5. 9 x10'tee。 On earth, wind, water, ocean temperature difference energy, wave energy and biomass energy and some of the tidal power is derived from the sun; Even the earth's fossil raw materials ( Such as coal, oil, natural gas, etc. ) Basically is time immemorial stored solar energy. So, the generalized included the scope of the solar energy is very big. Narrow sense of the solar energy is limited to the sun radiation energy of sunlight, photoelectric direct conversion and light chemical.

, LED street light