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Seven-focal superposition uniform concentrating Fresnel lens applied to concentrated photovoltaic power generation

A Fresnel lens and concentrating photovoltaic technology, applied in the field of condensing lenses, can solve the problems of shortening battery life, uneven energy distribution, damage to batteries, etc., to avoid local hot spots, improve conversion efficiency and battery life, and improve The effect of uniformity

Active Publication Date: 2018-02-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Photovoltaic power generation is a major form of direct utilization of solar energy. The Fresnel lens is one of the core components of the concentrated photovoltaic system. Its performance directly affects the performance of the entire system. The traditional point concentrated Fresnel lens is due to The energy distribution of the concentrated spot is not uniform. After the incident sunlight is concentrated, local hot spots will be formed on the surface of the battery. The photoelectric conversion efficiency of the power generation system is low

Method used

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  • Seven-focal superposition uniform concentrating Fresnel lens applied to concentrated photovoltaic power generation
  • Seven-focal superposition uniform concentrating Fresnel lens applied to concentrated photovoltaic power generation
  • Seven-focal superposition uniform concentrating Fresnel lens applied to concentrated photovoltaic power generation

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Embodiment 1

[0021] The front view of the concentrating photovoltaic power generation seven-focus superimposed uniform concentrating Fresnel lens 1 in this embodiment is as follows figure 1 shown. it consists of figure 2 The six identical concentric polygonal fan-shaped unit Fresnel lenses 2 and one such as image 3 The shown regular hexagonal unit Fresnel lens 6 is spliced; the lens surface of the concentric polygonal fan-shaped unit Fresnel lens 2 is engraved with concentric circular arcs from small to large, and the lens surface is a concentric polygonal sector, Including the first side 3, the second side 4, the third side 5 and the arc side; the two endpoints of the second side 4 are respectively connected with the first side 3 and the third side 5, and the lens surface is from the inside to the outside The third arc is a semicircle, the second side 4 passes through the center of the concentric arc, and completely coincides with the chord of the third arc; the first side 3 and the t...

Embodiment 2

[0025] The regular hexagonal unit Fresnel lens 6 in the concentrating photovoltaic power generation seven-focus superimposed uniform concentrating Fresnel lens 1 described in this embodiment can be obtained by cutting from the traditional point-focusing Fresnel lens 8, including the following steps:

[0026] (1) Make a regular hexagon at the center of the traditional point-focus Fresnel lens 8, and the six sides 9 of the hexagon are respectively tangent to the concentric circle corresponding to the fourth annulus outward from the center of the circle, as Figure 4 shown.

[0027] (2) Cut the regular hexagonal unit Fresnel lens 6 from the spot-concentrating Fresnel lens 8 along the six sides 9 of the regular hexagon.

Embodiment 3

[0029] The concentric polygonal fan-shaped unit Fresnel lens 2 in the concentrating photovoltaic power generation seven-focus superposition uniform concentrating Fresnel lens 1 described in this embodiment can be obtained by cutting from the traditional point-focusing Fresnel lens 8, including the following steps :

[0030] (1) Repeat the above steps, make a regular hexagon at the center of the traditional point-focusing Fresnel lens 8, and the six sides of the regular hexagon are respectively in phase with the concentric circles corresponding to the fourth annulus outwards from the center of the circle Cut, adjust the angle of the regular hexagon so that the straight line from the center of the concentric circle just intersects the two vertices of the regular hexagon at two points A and B, as Figure 5 shown.

[0031] (2) The other two pairs of vertices EG, FH connecting the regular hexagon are tangent to the third annular band of the concentric ring and two points C and D, ...

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Abstract

The invention provides a seven-focus superposition uniform concentration Fresnel lenses for concentration photovoltaic power generation. The lenses comprise six same concentric polygon sector unit Fresnel lenses and one regular hexagon unit Fresnel lens, wherein second edges of the six same concentric polygon sector unit Fresnel lenses are sequentially connected in a head to tail mode, the second edges of the six same concentric polygon sector unit Fresnel lenses are then sequentially and tightly connected with a fourth edge of the regular hexagon unit Fresnel lens, and length of the second edges is identical to length of the fourth edge; concentration light spot energy uniformity is improved through light wave superposition by the seven Fresnel lenses, a problem of hot local spots formed by non-uniform concentration existing in traditional point concentration Fresnel lenses can be avoided, and thereby solar conversion efficiency and service life of cells are improved. The seven-focus superposition uniform concentration Fresnel lenses has advantages of simple structure, easy realization and low cost.

Description

【Technical field】 [0001] The invention relates to the technical field of concentrating lenses, in particular to a seven-focus superimposed uniform concentrating Fresnel lens applied to concentrating photovoltaic power generation. 【Background technique】 [0002] Photovoltaic power generation is a major form of direct utilization of solar energy. The Fresnel lens is one of the core components of the concentrated photovoltaic system. Its performance directly affects the performance of the entire system. The traditional point concentrated Fresnel lens is The energy distribution of the concentrated spot is uneven. After the incident sunlight is concentrated, local hot spots will be formed on the surface of the battery. The photoelectric conversion efficiency of the power generation system is low. 【Content of invention】 [0003] Aiming at the problems existing in the traditional point concentrating Fresnel lens, the object of the present invention is a seven-focus superimposed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B19/00G02B3/08
CPCG02B3/08G02B19/0009G02B19/0042
Inventor 王进军
Owner SHAANXI UNIV OF SCI & TECH
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