Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 161, Issue -, Pages 284-293Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2018.01.082
Keywords
Linear Fresnel reflector; End losses minimization; Two-axis tracking system; Optical performance
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Funding
- six talent peaks project in Jiangsu, China [XNY-028]
- National Natural Science Foundation of China [51105192]
- Natural Science Foundation of Jiangsu province of China [BK2010556]
- National Key Technology RD Program [2014BAJ01B06]
- Australian Research Council [DE1601000131]
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In order to compensate for end losses in linear solar concentrators (which can account for 33% of the optical losses), a mechanically simple two-axis tracking system was designed and analyzed. In the proposed system, a standard linear Fresnel reflector (LFR) with east-west rotational tracking was placed on north-south rails and driven by a linear actuator. By keeping the receiver fixed, end losses can be eliminated when the reflector slides along the rails. The relative optical efficiency improvement of this design was studied in detail though a combination of theory, numerical simulation, and experimentation. The results show that the annual average optical efficiency of an LFR can be improved by 8-50%, depending on the normalized collector length and local latitude. The optimal sliding distance limit, D-s,D-lim and the LFR geometries where this design is most techno-economically beneficial were also investigated. It was found that the proposed tracking system is most applicable to solar driven, industrial process heat systems where rooftop or ground space is limited.
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