CN203608146U - Flat type solar concentrator - Google Patents

Abstract

The utility model discloses a flat type solar concentrator. The solar concentrator comprises a Fresnel lens group, a flat type light guide plate and solar photovoltaic battery pieces; and the flat type light guide plate is arranged relatively to the Fresnel lens group, and the solar photovoltaic battery pieces are installed on two sides of the flat type light guide plate. Each Fresnel lens group is composed of multiple Fresnel lenses in a parallel manner; and each Fresnel lens is in an upper protruding shape, the upper surface of each Fresnel lens is a curved cylindrical surface, the lower surface of each Fresnel lens is jagged, and tooth widths of teeth are equal to each other. The upper surface of the flat type light guide plate is a flat surface, the bottom of the flat type light guide plate is equipped with a plurality of grooves, and each groove corresponds to a Fresnel lens light focal strip. The curved cylindrical surface Fresnel lenses are adopted, so the focal length of each lens is shortened, the disc of confusion is small, energy is more concentrated, and the thickness of the whole structure is greatly reduced.

Description

A kind of plate type solar concentrator

Technical field

The utility model relates to a kind of solar concentrator, is specifically related to a kind of plate type solar concentrator that is applicable to photovoltaic generation.

Background technology

In recent decades; under the dual-pressure of energy crisis and environmental problem; solar energy because of the plurality of advantages such as its unlimitedness, spatter property, generality become people pay close attention to focus; attempt to set it as the substitute of other conventional energy resources; but utilizing at present solar power generation is only 1% of total electricity supply, and photovoltaic power generation technology is not promoted.Its reason is that the solar energy density on actual arrival ground is lower, and peak value is no more than 1kW/m ², and conversion efficiency of solar cell is lower, and there is lack of raw materials and the more expensive photovoltaic generation cost that makes of price is higher for silicon simultaneously.Along with the continuous propelling that solar energy utilizes, photovoltaic concentration technology gets most of the attention, thereby this technology can converge sunlight and improve solar radiation energy density on the one hand, can utilize on the other hand the concentrator that price is more cheap to replace expensive solar cell.

The focal beam spot irradiance that traditional photovoltaic optical condenser can cause photovoltaic cell to receive in assembling sunlight is inhomogeneous, not only make the inner generation current of photovoltaic cell reduce photoelectric conversion efficiency, and its fever phenomenon has directly caused system premature aging, shorten the photovoltaic cell life-span, thereby comparatively huge popularization and the application that has limited this technology of collective optics volume simultaneously, an above difficult problem is urgently to be resolved hurrily.

Summary of the invention

The utility model is to overcome the large and inhomogeneous shortcoming of optically focused focal spot irradiance of existing photovoltaic optical condenser volume, provide a kind of thinner, converge the uniform high efficiency plate type solar of hot spot irradiance photovoltaic optical condenser.

In order to solve the technical problem of above-mentioned existence, the utility model adopts following technical proposals:

The utility model comprises Fresnel Lenses group, plate light guide plate and solar-energy photo-voltaic cell sheet, and plate light guide plate and Fresnel Lenses group are oppositely arranged, and solar-energy photo-voltaic cell sheet is equipped with in the both sides of plate light guide plate.

Described many group Fresnel Lenses groups are made up of side by side multiple Fresnel Lenses, and described Fresnel Lenses is presented convex, and its upper surface is bent cylinder, lower surface toothing, and the facewidth of each tooth equates.

Described plate light guide plate upper surface is plane, and bottom is with multiple grooves, and each groove is corresponding to the burnt band of a Fresnel Lenses light.

Single groove is made up of three reverse V-shaped structures, and the drift angle of each reverse V-shaped structure is 120 °.

The beneficial effect the utlity model has is:

Owing to having adopted bent cylinder Fresnel Lenses, shorten the focal length of lens, disc of confusion is little, and energy is more concentrated, and can make total thickness significantly reduce.The transmission that simultaneously utilizes light guide plate to realize light has reduced output, and the light that left converges brought heat homogenizing focal spot, can suppress, fever phenomenon low by the uneven caused photoelectric conversion efficiency of hot spot irradiance and photovoltaic cell premature aging problem in transmitting procedure.

Accompanying drawing explanation

Fig. 1 is the structural representation of a kind of plate type solar concentrator of the utility model.

Fig. 2 is the operation principle schematic diagram of the utility model plate type solar concentrator.

Fig. 3 is the former schematic diagram of work of the plate light guide plate of the utility model plate type solar concentrator.

1. bent cylinder Fresnel Lenses groups in figure, 2. plate light guide plate, 3. solar-energy photo-voltaic cell, 4. light 5. reflection recess.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail:

As shown in Figure 1, the utility model comprises bent cylinder Fresnel Lenses group 1, and the material of described Fresnel Lenses group is PMMA, formed by multiple Fresnel Lenses, the upper surface of single Fresnel Lenses is cylindrical, and lower surface is zigzag, and the facewidth of each profile of tooth equates.

Solar light 4 vertical incidence, pool the burnt band of a light through bent cylinder Fresnel Lenses group 1, and the burnt band of light is positioned at the upper surface of the V-type reflection recess 5 of plate light guide plate 2.

Described plate light guide plate 2 materials are BK7 glass, have multiple grooves, the corresponding Fresnel Lenses of each groove, and single groove becomes the type of falling 3V.

The drift angle of described V-type reflection recess 5 is 120 °, can make the parallel light of vertical incidence in the another side reflection of V-type groove, and incide light guide plate upper surface with 60 ° of angles, avoids V-type groove that light is caused and blocked.

Described plate light guide plate 2 meets light total reflection condition, and the light beam converging through Fresnel Lenses group 1 is propagated in light guide plate inner total reflection, avoids the waste of energy, improves the efficiency of concentrator.

Described solar cell 3 is positioned at the both sides of plate light guide plate 2, and the end face of big or small and plate light guide plate 2 is suitable, and the light that solar cell is accepted is the light after homogenizing, has improved battery dark area effect, has high light photoelectric transformation efficiency.

Plate type solar concentrator of the present utility model is single module, can be according to actual needs, spliced by multiple modules, realize large-area Salar light-gathering, uniformity more than more than 50% efficiency and 80% can be realized in incident light drift angle in ± 7 °, effectively reduces the requirement of tracking accuracy.

Claims (2)

1. a plate type solar concentrator, comprise Fresnel Lenses group, plate light guide plate and solar-energy photo-voltaic cell sheet, it is characterized in that: plate light guide plate and Fresnel Lenses group are oppositely arranged, and solar-energy photo-voltaic cell sheet is equipped with in the both sides of plate light guide plate;

Described many group Fresnel Lenses groups are made up of side by side multiple Fresnel Lenses, and described Fresnel Lenses is presented convex, and its upper surface is bent cylinder, lower surface toothing, and the facewidth of each tooth equates;

Described plate light guide plate upper surface is plane, and bottom is with multiple grooves, and each groove is corresponding to the burnt band of a Fresnel Lenses light.

2. a kind of plate type solar concentrator according to claim 1, is characterized in that: single groove is made up of three reverse V-shaped structures, the drift angle of each reverse V-shaped structure is 120 °.

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