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

A Fresnel lens, concentrating photovoltaic technology, applied in the field of condensing lens, 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, 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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  • Nine-focal superposition uniform concentrating Fresnel lens applied to concentrated photovoltaic power generation
  • Nine-focal superposition uniform concentrating Fresnel lens applied to concentrated photovoltaic power generation
  • Nine-focal superposition uniform concentrating Fresnel lens applied to concentrated photovoltaic power generation

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Experimental program
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Effect test

Embodiment 1

[0022] The front view of the concentrating photovoltaic power generation nine-focus superimposed uniform concentrating Fresnel lens 1 in this embodiment is as follows figure 1 shown. it consists of figure 2 Eight identical concentric polygonal sector unit Fresnel lenses 2 and one such as image 3 The shown regular octagonal unit Fresnel lens 6 is formed by splicing; the lens surface of the same unit Fresnel lens 2 is engraved with concentric arcs from small to large, and the head lens surface is a concentric polygonal sector, including the first One side 3, the second side 4, the third side 5 and the arc side; the two end points of the second side 4 are respectively connected with the first side 3 and the third side 5, and the lens surface is the first side from the inside to the outside. The two arcs are semicircles, the second side 4 passes through the center of the concentric arc, and completely coincides with the chord of the second arc; the first side 3 and the third s...

Embodiment 2

[0026] The regular octagonal unit Fresnel lens 6 in the concentrating photovoltaic power generation nine-focus superimposed uniform concentrating Fresnel lens 1 described in this embodiment can be obtained by cutting from a traditional point-focusing Fresnel lens 8, including the following steps:

[0027] (1) Make a regular octagon in the center of the traditional point-focusing Fresnel lens 8, and the eight sides 9 of the regular octagon are respectively tangent to the concentric circles corresponding to the fifth annular band from the center of the circle outward, as shown in Figure 4 shown.

[0028] (2) Cut the regular octagon unit Fresnel lens 6 from the focal Fresnel lens 8 along the eight sides 9 of the regular octagon.

Embodiment 3

[0030] The concentric polygonal sector unit Fresnel lens 2 in the nine-focus superimposed uniform concentrating Fresnel lens 1 of the concentrated photovoltaic power generation described in this embodiment can be obtained by cutting from the traditional point-focusing Fresnel lens 8, including the following steps :

[0031] (1) Repeat the above steps to make a regular octagon in the center of the traditional point-focusing Fresnel lens 8, and the eight sides of the regular octagon are respectively aligned with the concentric circles corresponding to the fifth annular zone from the center of the circle outward. Cut, adjust the angle of the regular octagon, so that the straight line from the center of the concentric circle just intersects the two vertices of the regular octagon at points A and B, such as Figure 5 shown.

[0032] (2) The other two pairs of vertex angles EG and FH connecting the regular octagon and the third ring zone of the concentric ring are tangent to two po...

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Abstract

The invention provides a nine-focus superposition uniform concentration Fresnel lenses for concentration photovoltaic power generation. The lenses comprise eight same concentric polygon sector unit Fresnel lenses and one regular octagon unit Fresnel lens, wherein second edges of the eight same concentric polygon sector unit Fresnel lenses are sequentially connected in a head to tail mode, the second edges of the eight same concentric polygon sector unit Fresnel lenses are then sequentially and tightly connected with a fourth edge of the regular octagon 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 nine 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 the solar conversion efficiency and service life of cells are improved. The nine-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 condensing lenses, in particular to a nine-focus superimposed uniform condensing Fresnel lens applied to concentrating photovoltaic power generation. 【Background technique】 [0002] Photovoltaic power generation is a main form of direct utilization of solar energy. Fresnel lens is one of the core components of concentrating photovoltaic systems. Its performance directly affects the performance of the entire system. The traditional point concentrating Fresnel lens is due to The energy distribution of the concentrating spot is uneven. After the incident sunlight is concentrated, local hot spots are formed on the surface of the battery. The existence of local hot spots will reduce the conversion efficiency of the battery on the one hand, and damage the battery and shorten the service life of the battery on the other hand, resulting in solar photovoltaic. The photoelectric conversion efficiency of the power...

Claims

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Application Information

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