Journal
ENERGIES
Volume 11, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/en11040887
Keywords
solar energy; fixed-focus; polar-axis tracking; Fresnel lens; optical efficiency
Categories
Funding
- National Natural Science Foundation of China [51476038]
- Guangzhou Science and Technology Program of Production and Research Collaborative Innovation Major Project [2016201604030020]
- Guangdong Province Frontier and Key Technology Innovation Special Fund Project [2016A050503042]
- Nansha District Science and Technology Program [2016CX013]
- Guangzhou Science and Technology Program Production and Research Collaborative Innovation Major Project [201704030009]
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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 (eta(re-opt,loss)) and minimum value of the optical efficiency (eta(opt)) 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 degrees, the eta(opt) 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 eta(re-opt),(loss) is 0.116%, which means the proposed the FFFSC can achieve fixed-focus.
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