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Appl. Sci. 2016, 6(4), 115; doi:10.3390/app6040115

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

Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 80778, Taiwan
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Academic Editor: Alejandro Pérez-Rodríguez
Received: 28 December 2015 / Revised: 8 April 2016 / Accepted: 11 April 2016 / Published: 20 April 2016
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Abstract

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. View Full-Text
Keywords: solar tracking system; Fresnel lens; altitude-azimuth biaxial tracing solar tracking system; Fresnel lens; altitude-azimuth biaxial tracing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Cheng, T.C.; Yang, C.K.; Lin, I. Biaxial-Type Concentrated Solar Tracking System with a Fresnel Lens for Solar-Thermal Applications. Appl. Sci. 2016, 6, 115.

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