TWI679841B - Solar concentrator - Google Patents

Abstract

A solar collector is formed by transparent glass, a solar panel, a cymbal, and an optical film. The solar panel is disposed on the side of the transparent glass, and the cymbal is disposed above the transparent glass to guide incident sunlight to the solar panel. The thin film is set under the transparent glass, which can reflect part of the wavelength range of the sunlight and return to the transparent glass for transmission, so as to improve the solar panel's light collection efficiency, to achieve a higher solar power generation current, and to make the solar light Part of the waveband range penetrates the optical film to control the color and amount of sunlight leaving the solar collector. In addition, a fluorescent adhesive layer can be set under the optical film to convert sunlight into a region of the solar panel with a better response band, which can further increase the power generation current of the solar panel.

Description

Solar collector

The invention relates to a solar light collector, in particular to a solar light collector using a cymbal and an optical film to improve power generation efficiency.

A solar concentrator can collect sunlight and focus it on a small area solar cell receiving surface to increase the efficiency of collecting sunlight, improve the photoelectric conversion efficiency of solar cells, and reduce the material of solar cells. In this way, it can solve the problem of expensive prices of solar cell materials.

However, whether a traditional solar collector is reflective or refractive, there is still much room for improvement in consideration of factors such as performance, price, and manufacturing; for example, a different number of lenses or mirrors must be used To collect enough sunlight, the volume of the entire mirror group is often very large and cumbersome, and it is expensive. It is necessary to simplify the size and achieve higher light collection efficiency.

In the further improved solar light collectors, almost all geometric collection mirrors or lenses are used to improve the light guide ability of the solar light collectors. For example, the Republic of China Patent No. 200937655 discloses a thin-film solar collector / collector that has prism features formed on the surface of the light guide. The ambient light incident on the light guide is redirected into the light guide by the prism feature and by total internal reflection. Guide through the light guide; use the light guide to collect, concentrate, and direct the light to the photovoltaic cell to increase the efficiency of converting light energy into heat and electricity and reduce the cost of the photovoltaic device. In addition, the Republic of China Patent No. M373472 discloses an improvement of the surface structure of the light collector. The improvement method is electrolytic polishing on the surface of a metal substrate structure, which effectively increases the corrosion resistance and weather resistance of the light collector and maintains bright surface characteristics. Furthermore, the Republic of China Patent No. I540744 discloses a wide-band reflector, a concentrating solar system, and a method of using the same. A UV-reflecting multilayer optical film is stacked on a visible / infrared-reflecting metal layer to obtain ultraviolet light. Broadband reflector that reflects infrared light. In addition, the Republic of China Patent No. I473279 discloses a solar concentrator, which uses a light converging element to reduce the material cost of the solar concentrator and achieves the advantage of being thin. In addition, the Republic of China Patent No. I473279 discloses a light collection method, a light collection system, and a light energy conversion device. The light collection system includes a light collecting element and a reflective curved surface element, which can make the light collecting system collect a large amount of incident light. Emitted in a denser, smaller light area. The Republic of China Patent No. 484702 discloses a penetrating holographic solar concentrator, which improves the focusing lens of the traditional solar concentrator, and is replaced by holographic optical elements, reducing the grinding of thick lenses and reducing weight.

With the development of various light collection systems and the improvement of solar cell efficiency, the development potential of solar light collection appliances has been made. Therefore, how to provide an improved solar concentrator that can effectively use solar energy, while reducing its volume and weight, and greatly reducing costs is still one of the important issues that researchers currently need to overcome and solve.

In view of this, the main object of the present invention is to provide a solar light collector that combines a cymbal, an optical film, a transparent glass, and a solar panel, in addition to reducing the amount and cost of the solar panel, and improving the light collection efficiency of the solar panel. To achieve higher solar power generation current and power generation efficiency.

Another object of the present invention is to provide a solar light collector, which is further provided with a fluorescent glue layer in the solar light collector, which can convert sunlight into a band region with a better response of the solar panel, and can further increase the power generation of the solar panel. Current.

Therefore, in order to achieve the above object, the present invention discloses a solar light collector, which includes a transparent glass, a solar panel, a cymbal, and at least one optical film; wherein the solar panel is disposed on the side of the transparent glass; the cymbal is disposed on the transparent The top surface of the glass can deflect the sunlight entering the surface of the cymbal, so that the sunlight has more opportunities to be guided to the side solar panel; and the optical film is set on the bottom surface of the transparent glass to reflect or transmit the sunlight Part of the band range allows sunlight to re-enter into transparent glass for transmission, increasing the chance of sunlight shining on the solar panel, thereby achieving a higher solar panel power generation current, and controlling the amount of sunlight leaving the solar collector. The amount and color make this solar collector have the ability to control color selection and brightness.

According to the embodiment of the present invention, a fluorescent adhesive layer may be disposed under the optical film of the solar light collector to convert sunlight into a region of the solar panel with a better response band, and further increase the power generation current of the solar panel.

In the following, detailed descriptions will be made through specific embodiments in conjunction with the accompanying drawings to make it easier to understand the purpose, technical content, features and effects of the present invention.

Please refer to FIG. 1, which illustrates a schematic diagram of a solar light collector 100 provided by a first embodiment of the present invention.

In this embodiment, a transparent glass 10, a solar panel 20, a cymbal 30, and an optical film 40 are used to form a solar light collector 100. The transparent glass 10 has a top surface 11, a bottom surface 12 and a plurality of side surfaces 13. The solar panel 20 is attached to one side surface 13 of the transparent glass 10, and the cymbal 30 is attached to the top surface 11 of the transparent glass 10. The optical film 40 is attached to the bottom surface 12 of the transparent glass 10. When sunlight enters the transparent glass 10 from the surface of the diaphragm 30, the diaphragm 30 can deflect the sunlight entering the surface of the diaphragm 30, so that the sunlight has more opportunities to be guided to the lateral solar panel 20, and the optical film 40 can choose to reflect or penetrate a part of the wavelength range of sunlight. On the one hand, after the sunlight is reflected by the optical film 40, it can be reflected by the inner surface of the cymbal 30, so that the sunlight can enter the transparent glass 10 multiple times. The lateral transmission allows the sunlight to have more opportunities to be guided to the lateral solar panel 20. On the other hand, using sunlight that penetrates the optical film 40 can not only control the color of the sunlight leaving the solar collector 100, but also The amount of sunlight leaving the solar collector 100 can be controlled, so that the solar collector 100 has the ability to control color selection and brightness.

The transparent glass 10 used in this embodiment is preferably B270, with a length and width of 5 cm (cm) × 5 cm and a thickness of 5 mm (mm). The silicon solar panel 20 is used. The size of the silicon solar panel 20 is 5cm × 0.5cm, and the optical film 40 may be at least one or more pieces, and the optical film 40 may be selected from visible light penetration, blue light penetration, green light penetration, blue and red light penetration, and red light. A combination of one or more optical films penetrated by the region, and the optical film 40 may be combined on one or more substrates, such as a plastic or glass substrate 41.

Please refer to FIG. 2 and FIG. 3, which show the transmittance graphs of six types of optical films V1, V2, B, G, M, and R. Among them, V1 and V2 in FIG. 2 are visible light transmission, B Is the penetration of the blue light region, G in FIG. 3 is the penetration of the green light region, M is the penetration of the blue light region and the red light region, and R is the penetration of the red light region. The six optical films V1, V2, B, G, M, and R are each composed of a high-refractive index film and a low-refractive index film sequentially stacked on each other. The high-refractive index film and the low-refractive index film may be a titanium dioxide film and a The silicon oxide film is not limited in practice, and may be an oxide film, a fluoride film, a nitride film, or a metal film, respectively. As shown in Fig. 2, the visible light region of the optical film V1 penetrates from 388 nanometers (nm) to 644 nm, and the near-infrared light region has high reflection without penetration from 691 nm to 1119 nm. The visible light region of the optical film V2 penetrates The range is from 410nm to 717nm. The near-infrared region is highly reflective and does not penetrate from 777nm to 1169nm. The visible range of optical film B is from 350nm to 517nm, most of which belong to the blue range. As shown in Figure 3, the visible light range of the optical film G ranges from 494 nm to 587 nm, and most of it belongs to the green light range. The optical film M is from 387 nm to 529 nm, and then from 598 nm to the near-infrared region. In the range, the optical film R has a high transmission range from 596 nm to the near-infrared region, and the color of the transmitted light is red. It is known from the above that the near-infrared light regions of the optical films B, G, M, and R all belong to the transmissive range. Therefore, if the optical film V1 or V2 is attached, the near-infrared light region will be highly reflective and not penetrate And attach one or two glass substrates, so that the transmittances of the six optical film combinations listed in Table 1 are around 80%. Table 1 is a description of the composition of the six types of optical film combinations and glass substrate combinations; these optical film combinations are a combination of one or more of the above-mentioned optical films V1, V2, B, G, M, and R with a glass substrate.

Table I Optical film combination composition SUBT Glass substrate + glass substrate + glass substrate V1T V1 + glass substrate + glass substrate V2T V2 + glass substrate + glass substrate BT B + V1 + glass substrate GT G + V1 + glass substrate + glass substrate MT M + V2 + glass substrate + glass substrate RT R + V2 + glass substrate

Please refer to Figure 4, which shows the transmittance diagrams of three optical film combinations V1T, V2T, and BT, and please refer to Figure 5, which shows the transmittance diagrams of three optical film combinations GT, MT, and RT, all showing six The near-infrared light region of this optical film combination V1T, V2T, BT, GT, MT, and RT is highly reflective and does not penetrate, and the penetration of the penetrating region is around 80%. As shown in Figure 4, the visible light range of the optical film combination V1T ranges from 388 nm to 644 nm, the near-infrared light region has a high reflection without penetration range from 693 nm to 1119 nm, and the visible light range of the optical film combination V2T ranges from 410 nm. To 711nm, near-infrared region with high reflection without penetration range from 774nm to 1162nm, visible film region of optical film combination BT from 392nm to 517nm, most of which belong to blue light range, near-infrared region with high reflection without penetration The range is from 529nm to 1130nm. As shown in Figure 5, the visible light range of the optical film combination GT ranges from 494 nm to 586 nm, and most of it belongs to the green light range. The near-infrared light region has high reflection without transmission range from 607 nm to 1119 nm. The visible light range penetrates from 410nm to 529nm and 598nm to 712nm, the near-infrared region is highly reflective and does not penetrate from 774nm to 1164nm. The visible light region of the optical film combination RT ranges from 596nm to 712nm, most of which are red. Light range, near-infrared light region with high reflection without penetration range from 776nm to 1167nm. Because human vision cannot observe the near-infrared light region, the six optical film combinations V1T, V2T, BT, GT, MT, and RT all highly reflect the near-infrared light region, and then reflect through the inner surface of the diaphragm to make the near-infrared light region The sunlight can enter the transparent glass multiple times and be transmitted laterally, so that the sunlight in the near-infrared region has more opportunities to be guided to the side solar panel, and the solar panel power generation current is increased.

Further, in this embodiment, sunlight of a solar simulator is used to illuminate a solar concentrator. The solar concentrator uses six types of optical film combinations V1T, V2T, BT, GT, MT, RT, and glass as shown in Table 1. The substrate combination SUBT measures the short-circuit current of the solar panel for five consecutive times and averages them. The measurement results are shown in the lower curve of Table 2 and Figure 6. Among them, the solar collectors of different groups are combined with optical films or The name of the glass substrate combination is represented.

Table II Group Short-circuit current (mA) SUBT 16.5 V1T 24.38 V2T 23.83 BT 25.23 GT 25.22 MT 24.7 RT 24.9

It is known from Table 2 and Figure 6 that different combinations of optical films can increase the short-circuit current of solar panels. From Figures 4 and 5, it is known that sunlight of different colors and different brightness penetrates the solar collector. .

In addition, please refer to FIG. 7, which illustrates a schematic diagram of the solar light collector 200 provided by the second embodiment of the present invention.

In this embodiment, the fluorescent adhesive layer 50 is attached below the optical film 40 of the solar light collector 100 (see FIG. 1) of the first embodiment to convert sunlight into a solar panel 20 with a better response. In the band region, the short-circuit current of the solar panel 20 can be further increased. The manufacturing method of the fluorescent adhesive layer 50 is to use a yellow inorganic fluorescent powder layer with a rubber powder ratio of 10%. First, the fluorescent powder is mixed with silicon rubber at a weight percentage of 10%, and is evenly stirred with a centrifugal defoamer. Then, the air in the mixed solution was evacuated, and then the spin coating method was used to spin the test piece at a rotation speed of 900 rpm and a rotation time of 25 seconds. Finally, the test piece was dried at 150 ° C for two hours in a high-temperature oven to obtain fluorescent light.光 胶层 50。 Light adhesive layer 50.

Similarly, in this embodiment, sunlight of a sunlight simulator is used to illuminate a solar collector with a fluorescent glue layer, and the solar collector also uses six optical film combinations V1T, V2T, and BT as shown in Table 1. , GT, MT, RT and glass substrate combined SUBT, measure the short-circuit current of the solar panel 5 times in a row and average them. The measurement results are shown in the upper curve of Table 3 and Figure 6. Among them, the solar energy of different groups The light collector is represented by the name of the optical film combination or the glass substrate combination

Table three Group Short-circuit current (mA) SUBT 20.68 V1T 25.07 V2T 24.87 BT 25.51 GT 25.6 MT 24.91 RT 25.15

It is known from Table 3 and Figure 6 that different combinations of optical films can increase the short-circuit current of solar panels. From Figures 4 and 5, it is known that sunlight of different colors and different brightness penetrates the solar collector. .

In various embodiments of the present invention, the optical film can be attached not only to the bottom surface of transparent glass, but also can be plated on the bottom surface of transparent glass, which can reduce the substrate for attachment and reduce the cost. Similarly, the fluorescent adhesive layer can also be plated under the optical film, which can reduce the substrate for attachment and reduce the cost.

In summary, the solar light collector disclosed in the present invention has a special design of a cymbal with an optical film, which can reduce the amount and cost of the solar panel, and still improve the light collection efficiency of the solar panel to achieve a relatively High solar power current. Furthermore, the fluorescent adhesive layer is disposed under the optical film, and the sunlight is converted into a region where the solar panel has a better response, which can further increase the power generation current of the solar panel. In addition, through the use of different optical films, the above-mentioned solar light collector can not only control the amount and color of sunlight leaving the solar light collector, but also improve the light collection efficiency of the solar light collector and increase the solar panel power generation current and Power generation efficiency.

Furthermore, the solar light collector disclosed in the present invention can be widely used in solar technology fields such as fluorescent solar light collectors, light-emitting layer solar light collectors, etc., in order to increase its light collection efficiency and power generation efficiency, and achieve higher Solar panels generate electricity.

The above-mentioned embodiments are only for explaining the technical ideas and characteristics of the present invention. The purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. When the scope of the patent of the present invention cannot be limited, That is, any equivalent changes or modifications made in accordance with the spirit disclosed in the present invention should still be covered by the patent scope of the present invention.

100‧‧‧solar collector

10‧‧‧ clear glass

11‧‧‧Top

12‧‧‧ underside

13‧‧‧ side

200‧‧‧solar collector

20‧‧‧ solar panels

30‧‧‧ cymbals

40‧‧‧Optical film

41‧‧‧ glass substrate

50‧‧‧Fluorescent adhesive layer

V1, V2, B, G, M, R‧‧‧ optical film

V1T, V2T, BT, GT, MT, RT‧‧‧ optical film combination

FIG. 1 is a schematic diagram of a solar light collector provided by a first embodiment of the present invention. FIG. 2 is a transmittance chart of the optical films V1, V2, and B used in the present invention. FIG. 3 is a transmittance chart of optical films G, M, and R used in the present invention. FIG. 4 is a transmittance chart of the optical film combinations V1T, V2T, and BT used in the present invention. FIG. 5 is a transmittance diagram of the optical film combination GT, MT, and RT used in the present invention. FIG. 6 is a measurement result of short-circuit current of a solar panel using different combinations of optical films in the solar concentrators of the first and second embodiments of the present invention; wherein the lower and upper curves represent the first and the first embodiments, respectively. Two embodiments. FIG. 7 is a schematic diagram of a solar light collector provided by a second embodiment of the present invention.

Claims (7)

A solar light collector includes: a transparent glass having a top surface, a bottom surface, and a plurality of sides; a solar panel disposed on one side of the transparent glass; and a diaphragm disposed on the transparent glass The top surface; at least one optical film disposed on the bottom surface of the transparent glass; and a fluorescent adhesive layer disposed under the optical film. The solar light collector according to claim 1, wherein the optical film is composed of a high refractive index film and a low refractive index film sequentially stacked on each other. The solar collector according to claim 2, wherein the high-refractive index film and the low-refractive index film are respectively selected from one of an oxide film, a fluoride film, a nitride film, and a metal film. The solar collector according to claim 1, wherein the optical film is an optical film that penetrates in a visible region, a blue region, a green region, a blue region and a red region, and a red region. A combination of one or more of these. The solar light collector according to claim 1, wherein the optical film is bonded to at least one substrate, and the substrate is a plastic or glass substrate. The solar light collector according to claim 1, wherein the optical film is attached or plated on the bottom surface of the transparent glass. The solar light collector according to claim 1, wherein the fluorescent adhesive layer is attached or plated under the optical film.