Biaxial-Type Concentrated Solar Tracking System with a Fresnel Lens for Solar-Thermal Applications

In this paper, an electromechanical, biaxial-type concentrated solar tracking system was designed for solar-thermal applications. In our tracking system, the sunlight was concentrated by the microstructure of Fresnel lens to the heating head of the Stirling engine and two solar cells were installed to provide the power for tracking system operation. In order to obtain the maximum sun power, the tracking system traces the sun with the altitude-azimuth biaxial tracing method and accurately maintains the sun’s radiation perpendicular to the plane of the heating head. The results indicated that the position of heating head is an important factor for power collection. If the sunlight can be concentrated to completely cover the heating head with small heat loss, we can obtain the maximum temperature of the heating head of the Stirling engine. Therefore, the temperature of heating head can be higher than 1000 °C in our experiment on a sunny day. Moreover, the results also revealed that the temperature decrease of the heating head is less than the power decrease of solar irradiation because of the latent heat of copper and the small heat loss from the heating head.

[1]  Ziyad M. Salameh,et al.  Simple electro-optically controlled dual-axis sun tracker , 1990 .

[2]  Felix Tellez,et al.  Central Receiver System Solar Power Plant Using Molten Salt as Heat Transfer Fluid , 2008 .

[3]  Somchai Wongwises,et al.  A review of solar-powered Stirling engines and low temperature differential Stirling engines , 2003 .

[4]  Cheng Siong Chin,et al.  Design, Modeling and Testing of a Standalone Single Axis Active Solar Tracker using MATLAB/Simulink , 2011 .

[5]  Ruzhu Wang,et al.  Concentrated solar energy applications using Fresnel lenses: A review , 2011 .

[6]  Kok-Keong Chong,et al.  General Formula for On-Axis Sun-Tracking System , 2010 .

[7]  Richard B. Diver,et al.  A Compendium of Solar Dish/Stirling Technology , 1994 .

[8]  Can Çinar,et al.  Manufacturing and testing of a gamma type Stirling engine , 2005 .

[9]  S. C. Kaushik,et al.  Exergetic analysis of a solar thermal power system , 2000 .

[10]  Y. Tripanagnostopoulos,et al.  The Fresnel lens concept for solar control of buildings , 2007 .

[11]  Ali Reza Tavakolpour,et al.  Simulation, construction and testing of a two-cylinder solar Stirling engine powered by a flat-plate solar collector without regenerator , 2008 .

[12]  B. Ross.  Status of the emerging technology of Stirling machines , 1995 .

[13]  Eckhard Lüpfert,et al.  Advances in Parabolic Trough Solar Power Technology , 2002 .

[14]  V. Poulek,et al.  New solar tracker , 1998 .

[15]  Sode-Shinni Nmadu Rumala,et al.  A shadow method for automatic tracking , 1986 .

[16]  Joseph E. Ford,et al.  Reactive self-tracking solar concentrators: concept, design, and initial materials characterization. , 2012, Applied optics.

[17]  M. Clifford,et al.  Design of a novel passive solar tracker , 2004 .

[18]  Brian Edwards.  Computer based sun following system , 1978 .