Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 56: Photovoltaik I

HL 56.3: Talk

Tuesday, March 8, 2005, 15:30–15:45, TU P-N202

Static solar concentrators under Stuttgart insolation conditions — •C. Carlsson, M. B. Schubert, and J. H. Werner — Institut für Physikalische Elektronik, Uni-Stuttgart, Pfaffenwaldring 47, 705 69 Stuttgart

Static concentrators offer a possibility to concentrate sun light onto solar cells without a costly tracking device. The annual efficiency of such concentrators depends on their specific design, on the inclination angle towards the sun, as well as on the insolation conditions. This study evaluates the gain of two- and three-dimensional V-trough concentrators with a side-wall angle of 60^∘, located in Stuttgart with a tilt towards South with 48^∘. In order to simulate the optical acceptance of the V-troughs for all relevant incident angles of light, we developed an appropriate ray-tracing program. Calculations using the optical acceptance and radiation data representative for Stuttgart yield an annual irradiance gain of the order of 1.5 for both types of concentrating systems. In contrast to our first expectations, the three-dimensional trough exhibits a slightly lower annual irradiance gain than the two-dimensional system. This effect is explained by enhanced shadowing effects due to the restricted acceptance angle in the East-West direction.