Abstract
Truncation of nonimaging cusp reflectors which concentrate sunlight onto cylindrical receivers leads to collector designs which are more cost effective through substantial reductions in mirror height and length with small reductions in concentration ratios. In this paper, reflector shapes for truncated nonimaging cusp concentrators having various acceptance angles are presented, as well as curves for height/aperture and mirror arc length/aperture ratios versus concentration ratio. In addition to their general utility in concentrator design, the latter curves have special significance for thermoformed plastic reflector substrates. The reflector height/aperture ratio is the “draw”, and the reflector arc length/aperture ratio is the “stretch” to which the material is subjected during forming. With this information, important considerations in plastics fabrication can be addressed easily in the early design stages.
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