Appendix J THE DIFFERENTIAL EQUATION FOR THE 2D CONCENTRATOR PROFILE WITH NONPLANE ABSORBER

It was shown in Chapter 5 that the concentrator profile that gives the theoretical maximum concentration is obtained in two sections. The first section, that shadowed from the direct rays at angles less than θ_{i}, the maximum input angle, is an involute of the absorber cross section. The second section is such that rays at θ_{i} are tangent to the absorber after one reflection at the concentrator surface.

We suppose the absorber surface to be specified by its polar coordinates *r*, θ, as in Figure J.1. The current point *P* on the profile is at a distance *t* from the corresponding tangent point on the absorber. The condition for reflection is

Figure J.1 The differential ...

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