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The Effect of Global Solar Variations on the Performance

From the very beginning, the mankind has observed the sun as a most significant source of energy. It is totally confirmed that the radiation coming from the sun is an electromagnetic radiation which is quantized in nature and the quanta of this energy is known as photon. The quantum of energy possessed by one photon is ‘hν’ where h is the Plank’s constant and ν is frequency of radiation. The radiation which is most significant to us is that emitted from the sun, the earth and the atmosphere lying within the ultraviolet, visible and infrared spectral regions [1]. Most solar and terrestrial radiation falls between 0.15 and 120µm and the radiation of practical importance to the solar energy users falls between 0.15 and 5.0 µm. Visible radiation wavelengths lies between 0.38 and 0.72 µm [2]. Solar energy will be even more relevant for developing nations whose energy requirements are increasing rapidly as a result of large scale industrialization and growing population, for these nations, it is easier to switch directly to renewable energy sources, since they are yet to choose their options. The energy crisis of the seventies has encouraged research in energy related areas, especially those, useful for utilization of solar energy.