Solar flux distribution on central receivers: A projection method from analytic function |
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Affiliation: | 1. Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education, School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an, Shaanxi 710049, China;2. Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA;1. Stokes Laboratories, Bernal Institute, School of Engineering, University of Limerick, Ireland;2. Vast Solar, Level 10, 17-19 Bridge St, Sydney, NSW 2000, Australia |
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Abstract: | This paper presents a methodology to project the flux distribution from the image plane into the panels of any central receiver in Solar Power Tower plants. Since analytic functions derived from the convolution approach are conveniently defined on the image plane, its oblique projection solves the distorted spot found in actual receivers. Because of its accuracy describing the flux distribution due to rectangular focusing heliostats, we make use of the analytic function on the image plane by Collado et al. (1986). Based on the projection method, we have developed a computer code successfully confronted against PSA measurements and SolTrace software, either for flat plate or multi-panel cylindrical receivers. The validated model overcomes the computation time limitation associated to Monte Carlo technique, with a similar accuracy and even higher level of resolution. For each heliostat in a field, the spillage is computed besides the rest of optical losses; parallel projection is used for shading and blocking. The resulting optical performance tool generates the flux map caused by a whole field of heliostats. A multi-aiming strategy is investigated on the basis of the radius of the reflected beams, estimated from error cone angles. |
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Keywords: | Solar power tower Multi-panel cylindrical receiver Flux density concentration Oblique projection Heliostat field optical efficiency Multi-aiming strategy |
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