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Solar Energy Research Paper

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2.6 Solar Energy
2.6.1 Introduction
Energy from the sun is called solar energy. The Sun’s energy comes from nuclear fusion reaction that takes place deep in the sun. Hydrogen nucleus fuse into helium nucleus. The energy from these reactions flow out from the sun and escape into space. Solar energy is sometimes called radiant energy. These are different kinds of radiant energy emitted by sun. The most important are light infrared rays. Ultra violet rays, and X- Rays. The sun is a large sphere of very hot gases. Its diameter is 1.39x106KM. While that of the earth is 1.27x104 KM. The mean distance between the two is 1.5x108KM. The beam radiation received from the sun on the earth is reflected in to space, another 15% is absorbed by the earth atmosphere …show more content…
Its diameter is 1.39x106 KM. While that of the earth is 1.27x104 KM. The mean distance between the two is 1.50x108 KM. Although the sun is large, it subtends an angle of only 32 minutes at the earth’s surface. This is because it is also a very large distance. Thus the beam radiation received from the sun on the earth is almost parallel. The brightness of the sun varies from its center to its edge. However for engineering calculations, it is customary to assume that the brightness all over the solar disc in uniform. As viewed from the earth, the radiation coming from the sun appears to be essentially equivalent to that coming from a back surface at 5762ok. “The rate at which solar energy arrives at the top of the atmosphere is called solar constant Isc”. This is the amount of energy received in unit time on a unit area perpendicular to the sun’s direction at the mean distance of the earth from the sun. Because of the sun’s distance and activity vary throughout the year, the rate of arrival of solar constant is thus an average from which the actual values vary up to 3 percent in either direction. The National Aeronautics and Space Administration’s (NASA) standard value the solar constant, expressed in three common units, is as …show more content…
A sketch of the Instrument as Installed for the measurement of global radiation. Basically the pyranometer consists of a ‘black’ surface which heats up when exposed to solar radiation. Its temperature increases until its rate of heat gain by solar radiation equals its rate of heat loss by convection, conduction and radiation. The hot Junctions of a thermopile are attached to the black surface. While the cold Junctions are located in such a way that they do not receive the radiation. As a result, an e. m. f. is generated. This emf which is usually in the range of 0 to 10MV can be read, recorded or Integrated over a period of time and is a measure of the global

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