Nonimaging Fresnel Lenses: Design and Performance of Solar by Dr. Ralf Leutz, Dr. Akio Suzuki (auth.)

By Dr. Ralf Leutz, Dr. Akio Suzuki (auth.)

This publication bargains a close and entire account of the engineering of the world's first nonimaging Fresnel lens sunlight concentrator. The booklet closes a spot in sun concentrator layout, and describes nonimaging refractive optics and its numerical arithmetic . The contents stick with a platforms strategy that's absent in usual handbooks of optics or solar power. The reader is brought to the rules, theories, and benefits of nonimaging optics from the perspective of concentrating sun (the sunlight concentrator idea). The publication exhibits the reader how to define his or her personal optical resolution utilizing the foundations and methodologies overlaying the layout and the review of the nonimaging lens. This novel sun concentrator is constructed in the normal constraints awarded by means of the solar and in terms of aggressive strategies provided by means of different concentrators.

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Extra resources for Nonimaging Fresnel Lenses: Design and Performance of Solar Concentrators

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6) illuminat es a cirele having a radius of (pEol eosBs ), where p is the distanee between the foeal point Fand P, and B is the angle between PFand the optieal axis of the paraboloid. 20) p(B)=l+eosB' where 1 is the foeal length of the eoneentrator. 21 ) eosB is also a function of B. f;r . 2 Generalized Ideal Concentration 25 This concentration is maximized for 'ljJr = 7r I 4, which results in C = 10 900. 19). In reality, concentration by the paraboloid yields a radiation intensity distribution around the exact focal point.

The foci are identical to the edges of a f1at absorber, or the exit aperture. All edge rays impinge on the point after one reflection. All rays having smaller angles of incidence will irradiate the absorber region. Thus, all rays within ±Oo will be collected on the absorber. This is called the edge ray principle [182J. A ray whieh has a slightly larger angle of incidence is rejected from the entry aperture after several reflections between the two parabolic reflectors. In other words, the absorber part cannot be seen when looking through the entry apert ure at such angles.

27) and for the inner angles of refraction and incidence ß = 1J~ + 1J~ . 28) Applying Snell's law of refraction results in sin 1Jl = n' sin 1J~ , sin 1J2 = n' sin 1J~ . 29b) where n' is the refractive index of the prism material. The prism will be surrounded by air. 3 Deviation d8 d4>l =0. 31) -l. ::. 34) . 35) n,2 - sin 2 4>1 - n,2 - sin 2 4>2 . 36b) 4>1 denoting the conditions for an extremum of the deviation. To determine the nature of the extremum, the second derivative of the deviation d 28/ d4>i must be evaluated.

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