METHOD FOR CONCENTRATING SOLAR ENERGY Russian patent published in 2012 - IPC F24J2/06 

FIELD: solar technology.

SUBSTANCE: method includes reflection of the solar energy flow and its concentration at a heat absorber. The concentrated solar energy goes from the first stage energy concentrator to the light guide concentrator of circular or elliptical section made from dielectric non-absorbing (transparent) material, where flat inclined reflective (transparent or mirror) panels are installed along the whole length at regular intervals on the incident solar energy side. The solar energy flow from the first stage energy concentrator falls on the flat inclined reflective (transparent or mirror) panels with a 65-70 degrees angle of incidence, reflects from it and falls into the angled prism surfaces positioned with a 30-35 degrees angle of incidence. Then, after the air-glass boundary, the flow refracts in the glass and enters the inner pocket of the light guide concentrator, confined from all sides with glass in the axial direction, there the flow acquires the direction parallel to the rays reflected from the inclined panels, and the angle of incidence for rays falling on the opposite side of the light guide concentrator equals 60-65 degrees. For such rays as in the air-glass interface there exists an angle of total internal reflection, the rays will not pass through the boundary separating two media. Instead, they will stay inside the light guide concentrator, the solar energy flowing from the first stage concentrator will accumulate from all flat inclined reflective (transparent or mirror) panels, get into the light guide concentrator, and the solar energy flow will change, going along the light guide concentrator, going in the cross-section equal to the cross-section of the light guide. If a double-convex lens is installed in the flow outlet on the end face of the light guide concentrator, the accumulated solar energy is concentrated by the cylindrical parabolic concentrator into a point with the diameter of 1-2 mm. This allows the energy to be sent via an optical fibre bundle to the conversion device.

EFFECT: high solar energy concentration level; creation of conditions suitable for solar energy transmission without the conversion of the said energy.

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