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Open AccessArticle

Simulation and Experimental Study on the Optical Performance of a Fixed-Focus Fresnel Lens Solar Concentrator Using Polar-Axis Tracking

1
Department of Energy Engineering, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
2
Department of Human and Engineered Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo 277-8563, Japan
3
Solar Energy Research Institute, Yunnan Normal University, Kunming 650092, China
*
Authors to whom correspondence should be addressed.
Energies 2018, 11(4), 887; https://doi.org/10.3390/en11040887
Received: 15 March 2018 / Revised: 5 April 2018 / Accepted: 9 April 2018 / Published: 10 April 2018
(This article belongs to the Special Issue Solar Thermal Energy Utilization Technologies in Buildings)
Most sun-tracking systems of solar concentrators are expensive, sensitive to operational costs, and complicated in optical design in which the receiver must be free to rotate about the axis. To overcome the aforementioned problems, this study presents a fixed-focus Fresnel lens solar concentrator (FFFSC) using polar-axis tracking which allows the Fresnel lens to concentrate sunlight to a fixed small heat-receiving area and the receiver remained fixed in location and rotation. Experimental research has been conducted to obtain the optical characteristics of the FFFSC for different solar times, tracking errors, and periodical adjustment errors. It has been found that maximum values of the relative optical efficiency loss (ηre-opt,loss) and minimum value of the optical efficiency (ηopt) of the FFFSC for different solar times are 1.87% and 71.61%, respectively. The mean value and maximum value of the local concentration ratio of the solar flux on the receiver are more than 86.64 and 1319.43, respectively. When the tracking error and periodical adjustment error are within 1°, the ηopt of the FFFSC can reach 70.38% and 68.94%, respectively. The optical characteristics of FFFSC is also verified numerically. Especially, according to the total year simulation of the FFFSC’s optical characteristics, maximum value of ηre-opt,loss is 0.116%, which means the proposed the FFFSC can achieve fixed-focus. View Full-Text
Keywords: solar energy; fixed-focus; polar-axis tracking; Fresnel lens; optical efficiency solar energy; fixed-focus; polar-axis tracking; Fresnel lens; optical efficiency
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Wang, H.; Huang, J.; Song, M.; Hu, Y.; Wang, Y.; Lu, Z. Simulation and Experimental Study on the Optical Performance of a Fixed-Focus Fresnel Lens Solar Concentrator Using Polar-Axis Tracking. Energies 2018, 11, 887.

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