Introduction To Solar Energy Essay
INRODUCTION TO SOLAR ENERGY
Solar energy is the energy that we get from sun. Solar energy is most readily source of energy. It does not belong to anybody and hence it is free. It is the most important non-conventional source of energy because it is non-polluting and therefore helps in reducing greenhouse effect.
Solar energy is used since prehistoric times. In 1970s after the rise in oil prices, several countries began to formulate many research and development programs to use solar energy more efficiently.
The Earth receives a large amount of solar energy. Sun is a fusion reactor which has been burning over 4 billion years. In one minute, sun provides enough energy to meet world’s energy needs for one year. . In fact, "The amount of solar
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TACHOCLINE: Tachocline is the transition layer which separates radiative zone and convective zone. In this region the sharp regime change between the uniform rotation of the radiative zone and the differential rotation of the convection zone. It results in a large shear between the two. Presently it is hypothesized that “a magnetic dynamo within this layer generates the Sun 's magnetic field.”
CONVECTION ZONE: It extends from 0.7 solar radii to near the surface. The temperature of this layer is lower than in the radiative zone. Heavier atoms are not fully ionized in this layer. Due to this, radiative heat transport is less effective and hence through this layer convection moves the Sun 's energy outward. The density of the plasma is very low. It does not allow convective currents to develop. Due to this, an orderly motion of the mass develops into thermal cells that carry the majority of the heat outward to the Sun 's photosphere above.
Photosphere: Photosphere is the visible surface of the Sun. photosphere is the layer below which the Sun becomes opaque to visible light. Visible sunlight is free to propagate into space above the photosphere and its energy escapes the Sun entirely. The decreasing amount of H− ions which absorb visible light easily is the reason for the change in opacity. The extent of ionization is about 3% in photosphere leaving almost all of the hydrogen in atomic form. The photosphere is not fully
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