1. What percentage of the total solar energy striking the Earth is absorbed (not
ID: 2249356 • Letter: 1
Question
1. What percentage of the total solar energy striking the Earth is absorbed (not reflected)? 2. Define "power" as applied to solar radiation (Insolation). 3. At any location on Earth, the Sun's apparenst position in the sky is defined by 4. Define the two angles representing the Sun's relative position to a single observer. 5. Sketch a generic Sun Path Chart and indicate all axes and graph lines. (Use back of this paper). 6. Regarding solar collector efficiency, maximum solar energy capture is available when a in relation to the Sun's direct radiation? 7. Define magnetic declination . Why is magnetic declination an important consideration in solar site planning?Explanation / Answer
1. About 71% of the total incomming energy is absorbed by the earth system -23% is absorbed by the atmosphere and 43% is absorbed by the surface
2. Insolation is defined as the amount of solar energy that reaches a given area. It is measured by the amount of solar energy received per square centimetre per minute.
3. At any location the suns apparent position in the sky is defined by solar altitude and solar azimuth
4.The two angles are solar azimuth and solar elevation angle.The solar elevation angle(solar altitude) is the altitude of the Sun, the angle between the horizon and the centr of the Sun's disc. Solar azimuth angle is defined as the angular distance of the sun from the true north measured clockwise around the horizon
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