Design procedure of V-trough cavities for photovoltaic systems

✍ Scribed by N. Fraidenraich

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 216 KB
• Volume: 6
• Category: Article
• ISSN: 1062-7995
• DOI: 10.1002/(sici)1099-159x(199801/02)6:1<43::aid-pip200>3.0.co;2-p

✦ Synopsis

The combination of photovoltaic (PV) systems with V-trough cavities has been identi®ed as an attractive option to reduce, in the short time scale, the prices of the PV electrical energy. In places of good radiation level, the output energy of these devices can be almost doubled, compared to PV ¯at-plate ®xed systems. Additionally, V-trough cavities are simple to manufacture and can be used with conventional (1-sun) solar cells. In this work we present a design procedure for V-trough cavities used in combination with PV generators. The main design requirements are: uniform illumination on the plane of the PV module, within a ®nite interval of incidence angles; minimum cost of energy; and heat dissipation by natural, passive means. The V-trough cavities depend on two parameters. We obtain a ®rst analytical relation between the concentration ratio (C) and the V-trough angle (c) for concentrators with uniform illumination at the absorber. The region of minimum cost of the V-trough PV ensemble yields a second relation. Then, a unique pair of cavity parameters, satisfying the above criteria, is found. A design example of a V-trough cavity for the city of Recife, PE, Brazil, is presented.