2. Theoretical Background
The point focusing parabolic dish concentrator can have concentration ratios ranging from 100oC to a few thousand and can yield temperatures up to 3000C. These require continuous two-axis tracking. These involve surfaces of double curvature which reflects or refract incoming rays into a small region. A paraboloid is a surface produced by rotating a parabola about its optical axis. Owing to circular symmetry of the design, it produces a point image of a parallel beam of light on a particular period of a day. In the seventies the problem of ground based solar energy conversion started to grow to one of the greatest engineers challenges of this century. Among several other concepts, the farm system using high performing point focusing collectors was identified as a very promising solution in the lower power region up to 1 MW.
The solar energy conversion principle of high temperature and higher heat obtained by dish concentrator and on a focal absorber, the entire experimental setup called as solar parabolic dish concentrating system as shown in Fig. 1. Many investigations has been carried out like mirror based booster; line based focusing and point based focusing are common practice [2]. A parabolic dish, with curve obtained on concentrated point and making it as a curve towards the movement of the sun and making as a trace it can be called as solar trace and focusing through this path is most advantages over other systems. In two axis tracking east-west and north-south are required and commonly used in practice, and this paper eliminates there is no tracking in east-west, optimized with intermittent tracking is needed in the south west directions and it is always placed normal to the incoming solar radiation rays to obtain higher efficiency and to get more energy to be captured throughout the year. It has been a fabricated dish concentrator from small elementary shapes from highly polished aluminum sheet. These elemental components are commonly called as reflecting materials. This investigations and research work to design, development fabricate a parabolic dish steam generation equipment which is used as for solar energy and to carry out performances analysis of a parabolic collector to achieve the change phase as steam at the focal solar trace in the simultaneous movement of sun of the concentrator Parabolic dish system principle is developed and an experiment has been constructed as shown in Fig. 2. It is comparatively small unit which used to be a dish shaped reflector, concentrated sunray heats the water and super heated fluid used to generate the steam for larger capacity plants, a number of dishes may be used.