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Research Papers

Truncation of the Secondary Concentrator (CPC) as Means to Cost Effective Beam-Down System

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Akiba Segal, Michael Epstein

 Weizmann Institute of Science, Rehovot 76100, Israel

J. Sol. Energy Eng 132(3), 031004 (Jun 11, 2010) (4 pages) doi:10.1115/1.4001469 History: Received August 31, 2009; Revised February 11, 2010; Published June 11, 2010; Online June 11, 2010

A central solar plant based on beam-down optics is composed of a field of heliostats, a tower reflector (hyperboloid mirror), and a ground receiver interfaced at its aperture with one or a cluster of secondary concentrators (compound parabolic concentrator). In previous publications, a method was presented, illustrating the correlation between the tower reflector position and its size on one hand and the geometry, dimensions, and reflective area of the secondary concentrator on the other hand, both related to the heliostat field reflective area. Obviously, when one wishes to reduce the size of a tower reflector by locating it closer to the upper focal point, the image created at the lower focus will be broader, resulting in a larger secondary ground concentrator. The present paper describes a method for substantial decrease in the dimensions of the ground secondary concentrator cluster (and, implicitly, the concentrator's area) via truncation and some geometrical corrections without significant sacrifice of the optical performance. This offers a method for cost effective design of future central solar plants, utilizing the beam-down optics.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Geometry of the tower reflector

Grahic Jump Location
Figure 2

Field design for 1108 heliostats with 110,800 m2 reflective surface area

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