# US 7,607,429 B2 · Multistage system for radiant energy flux transformation comprising an array of slat-like reflectors

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- Number: US 7,607,429 B2
- Document ID: US7607429B2
- Status: Granted
- Kind: B2
- Application number: 11/581,989
- Filed: 2006-10-16
- Published: 2007-02-15
- Granted: 2009-10-27
- Earliest claimed: 2001-12-17
- Assignees: S.V.V. Technology Innovations, Inc.
- Inventors: Sergiy Victorovich Vasylyev; Viktor Petrovych Vasylyev
- Web page: https://patentgrep.com/patent/US7607429B2

## CPC

- G02B 19/0028: {refractive and reflective surfaces, e.g. non-imaging catadioptric systems}
- F24S 23/70: with reflectors
- F24S 23/79: with spaced and opposed interacting reflective surfaces
- G02B 17/006: {Systems in which light light is reflected on a plurality of parallel surfaces, e.g. louvre mirrors, total internal reflection [TIR] lenses (Fresnel mirrors G02B5/09, Fresnel lenses G02B3/08)}
- G02B 17/008: {Systems specially adapted to form image relays or chained systems}
- G02B 19/0023: {at least one surface having optical power}
- G02B 19/0042: {for use with direct solar radiation}
- G02B 27/0983: {being curved}
- F24S 2023/878: {Assemblies of spaced reflective elements in the form of grids, e.g. vertical or inclined reflective elements extending over heat absorbing elements}
- Y02E 10/40: Solar thermal energy, e.g. solar towers
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- F24S: SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS (for producing mechanical power from solar energy F03G6/00)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A radiant energy flux transformation system including a primary linear focus concentrating collector formed by a plurality of cylindrical slat-like reflectors and a secondary elongated collector is described. The reflectors of primary collector generally have concave or planar transversal profiles and are positioned in a stepped arrangement with longitudinal axes being parallel to each other and to the secondary collector. The reflectors are tilted away from the direction to the source of radiant energy at a range of angles being less than 45° to reflect and direct the incident energy flux to a common focal region located below the primary collector where the concentrated flux is intercepted and further transformed by the secondary collector. In addition to efficient concentrating radiant energy such as sunlight, the system can provide uniformity or a desired energy distribution in the concentrated flux.

## Claims

### Claim 1

A multistage system for radiant energy flux transformation comprising:
a primary energy collector comprising a plurality of spaced apart non-transparent elongated reflective elements oriented generally parallel to a reference line, said reflective elements having mirrored surfaces being inclined at predetermined angles to direct parallel incident rays toward a plurality of converging directions through spaces between adjacent pairs of said reflective elements and by means of single stage specular reflection, said angles being such as to result in the reflection of said parallel rays at a range of angles of incidence having particular values more than 45° and less than 90°, at least one mirrored surface having a concave transversal profile; and
an elongated secondary energy collector extending parallel to said reference line and disposed in energy receiving relation to at least one of said mirrored surfaces;
wherein at least a portion of radiant energy flux impinging on and reflected from said surfaces of said primary energy collector is intercepted and redirected by said secondary energy collector toward a predetermined direction so as to result in an improved transformation of said radiant energy flux.

### Claim 2 (depends on 1)

The multistage system of claim 1 wherein said surfaces are designed and positioned to minimize screening and shadowing on other said surfaces.

### Claim 3 (depends on 1)

The multistage system of claim 1 wherein said reflectors comprise mirrored strips of a rectangular planar shape.

### Claim 4 (depends on 3)

The multistage system of claim 3 wherein said strips are made of a sheet metal material.

### Claim 5 (depends on 1)

The multistage system of claim 1 wherein said transversal profile comprises a segment selected from the group consisting of a parabolic curve, circular arc, a parametric curve, and a spline.

### Claim 6 (depends on 1)

The multistage system according to claim 1 wherein at least two of said reflective elements have identical dimensions.

### Claim 7 (depends on 1)

The multistage system as defined in claim 1 wherein said primary energy collector is formed by two symmetrical segments.

### Claim 8 (depends on 1)

The multistage system of claim 1 wherein said secondary energy collector comprises means for flux homogenization.

### Claim 9 (depends on 1)

The multistage system of claim 1 wherein said secondary energy collector comprises means for flux concentration.

### Claim 10 (depends on 1)

The multistage system of claim 1 wherein said secondary energy collector comprises a planar rectangular mirror.

### Claim 11 (depends on 1)

The multistage system of claim 1 wherein said secondary energy collector comprises a trough shaped mirror.

### Claim 12 (depends on 1)

The multistage system of claim 1 wherein one or more said mirrored surfaces is disposed in any one of a translated, a reversed and/or a rotated orientation relative to said secondary energy collector.

### Claim 13

A solar energy collector employing the combination of a primary optical concentrator comprising a plurality of elongated mirrored reflectors positioned to reflect and direct sunlight downward to a plurality of directions converging toward a common linear focus area through spaces between adjacent pairs of said mirrored reflectors and by means of single stage specular reflection, at least one secondary optical element, and at least one photovoltaic solar cell; at least an outermost reflector of said plurality of elongated mirrored reflectors having a concave, focusing profile and a focus located in an immediate vicinity of said secondary optical element; wherein said secondary optical element is positioned to redirect at least a portion of the sunlight focused by an outermost said mirrored reflector to said photovoltaic solar cell.

### Claim 14 (depends on 13)

The solar energy collector of claim 13 wherein said secondary optical element comprises one or more cylindrically shaped mirrors.

### Claim 15 (depends on 13)

The solar energy collector of claim 13 wherein said secondary optical element comprises rectangular planar strips of a reflective sheet material.

### Claim 16 (depends on 13)

The solar energy collector of claim 13 wherein said secondary optical element comprises a refractive transparent body.