4. Non-Tracking Principles and System Development
In these parabolic concentrating rays towards the solar trace, it eliminates tracking of the sun concentrator which are (i) east-west and (ii) north-south directions. This paper presents that no tracking is needed according to the solar altitude angle and azimuth angle. The solar altitude angle is made from a point on the surface of the earth and to the centre of the solar disk and is lined extending horizontally from the point. It is merely on the particular year, whereas the azimuth angle is effectively used in solar energy radiation heating application and it absorbs or collects as much of the solar energy as possible. The azimuth angle plays major part in obtaining the greatest possible solar energy production. It is the horizontal plane measured from the south, for location in the southern hemisphere. Every day the sun rises from the east to west from the zero altitude angles, reaches to maximum at noon, and gradually decreases to west, where as the azimuth angle decreases up to solar noon and equal zero at solar noon. Afterwards the azimuth angle increases. The two angles vary depending upon the position and location of particular time of a day in year. The altitude angle at noon time for particular day is obtained as 56o [4]. Figure 3 shows the solar trace which obtained by line joining of intersections of reflected suns rays in the parabolic dish concentrator for the straight path of the sun. The solar radiation is explained in a clearway in Fig. 3 and the intensity of solar trace is maximum at the trace of the path. The absorber is kept along the trace shown Fig. 3, and the maximum intensity of radiation is obtained.