KR20190097807A - Shape-transformable compound parabolic solar concentrator - Google Patents

Abstract

Disclosed is a shape-transformable compound parabolic solar concentrator. The shape-transformable compound parabolic solar concentrator comprises: a first mirror of which the focus is located in a second mirror; and a second mirror of which the focus is located in the first mirror. The first mirror and the second mirror are designed to allow light to enter an entrance even if an incidence angle of the light entering the first mirror and the second mirror is changed, and adjust an allowable incidence angle range by adjusting slopes of the first mirror and the second mirror.

Description

Shape-transformable compound parabolic solar concentrator

The present invention relates to a shape-variable complex parabolic solar collector that can collect sunlight without daily light tracking by changing the shape of the CPC throughout the year.

Despite the advantages of reducing the material consumption and improving the voltage characteristics, the solar collector has a high cost for operating the light tracking system, which limits its practical use.

Luminescent Solar Concentrator (LSC) according to the prior art is a method in which the light emitting material absorbs light and then re-emits the light to induce light to the edge by total reflection. This method can collect light into the solar cell at the edge irrespective of the angle of incidence of light, but the light transmission efficiency is very low. Only available for limited purposes, such as glass window replacement.

Increasing the permissible incident angle of a one-dimensional compound parabolic concentrator (CPC) and aligning its axes from east to west allows condensing with less influence from sun movement throughout the year. However, the magnification of one-dimensional CPC is C = n / sin (θaccept / 2) where n is the refractive index of the mold within the CPC. In this case, C has only a low light magnification of less than 3.

According to the prior art, the lens is still and proposed to reduce the light tracking cost by moving the solar cell in the horizontal direction according to the focus. According to another prior art, a method of reducing light tracking costs using origami has been proposed. However, these methods only reduce the cost of light tracking and do not solve the fundamental problem of solar cells moving all day along the year.

The technical problem to be achieved by the present invention is to produce a one-dimensional CPC array to align the axial direction from east to west to propose a shape-variable composite parabolic solar light collector that minimizes the change in the incident angle of the cross-section direction according to the movement of the sun. In the case of the conventional one-dimensional CPC, the whole system should be tilted according to the altitude change of the sun during the year + -23.5 °, which is very expensive and generates an area not covered by the shadowing area. There is a problem. According to the present invention, the solar cell panel itself is fixed, but the shape of the parabolic mirror is changed according to the yearly solar altitude, and as the altitude of the sun changes, an asymmetric CPC is designed accordingly.

In one aspect, the variable variable composite parabolic solar light collector proposed by the present invention includes a first mirror having a focal point at the second mirror and a second mirror having a focal point at the first mirror, wherein the first mirror And the second mirror is designed to allow light to enter the entrance even when the incident angles of the light incident on the first mirror and the second mirror are changed, and the allowable angle of incidence by adjusting the inclination of the first mirror and the second mirror. Adjusting range, the first mirror and the second mirror is a linear mirror, the first mirror and the second mirror is an extendable mirror and extends in response to a change in shape throughout the year.

Based on the point at which the light reflected by the first mirror is focused on the second mirror at each inclination of the first mirror and the second mirror, and the point where the light reflected on the second mirror is focused on the first mirror By cutting the first mirror and the second mirror to adjust the condensing magnification.

The actuators of the first mirror and the second mirror use two-point linear mirrors installed only at the top of the first mirror and the second mirror, or use three-point linear mirrors with an auxiliary actuator.

According to another aspect, the variable variable composite parabolic solar collector proposed by the present invention includes a first mirror having a focal point at the second mirror and a second mirror having a focal point at the first mirror, The first mirror and the second mirror are designed to allow light to enter the entrance even if the incident angle of the light incident on the first mirror and the second mirror is changed, and by adjusting the inclination of the first mirror and the second mirror. Adjusting the allowable angle of incidence range, the first mirror and the second mirror comprises an upper mirror and a lower mirror, respectively, the upper mirror and the lower mirror includes a portion overlapping each other.

The first mirror and the second mirror between the actuator and the light inlet entrance installed on top of the first mirror and the second mirror so that the structure and size of the first mirror and the second mirror is converted according to the elasticity of the rubber band Hook a rubber band, attach the upper mirror to the rubber band, and attach a lower mirror to the inlet of the light collecting part.

The movement of the upper mirror changes as the actuator moves, the lower mirror leans against the upper mirror, and the upper mirror at the entrance of the condenser to increase the effect of the first mirror and the second mirror approximating the parabolic structure. The points fixing the lower mirror are spaced apart from each other.

The bottom mirror is a linear mirror or parabolic mirror.

According to another aspect, the variable variable composite parabolic solar collector proposed by the present invention includes a first mirror having a focal point at the second mirror and a second mirror having a focal point at the first mirror, The first mirror and the second mirror are designed to allow light to enter the entrance even if the incident angle of the light incident on the first mirror and the second mirror is changed, and by adjusting the inclination of the first mirror and the second mirror. Adjusting the allowable angle of incidence range, the first mirror and the second mirror is a parabolic metal mirror, and adjusts the inclination of the first mirror and the second mirror.

The first mirror and the second mirror are manufactured by coating a metal including silver and aluminum on glass, plastic, or a metal plate.

According to the embodiments of the present invention, the variable-shape complex parabolic photovoltaic light collector may manufacture a one-dimensional CPC array and align the axial direction in the east-west direction to minimize the change in the incident angle of the cross section according to the movement of the sun. In the case of the conventional one-dimensional CPC, the whole system should be tilted according to the altitude change of the sun during the year + -23.5 °, which is very expensive and generates an area not covered by the shadowing area. There is a problem. According to the present invention, the solar cell panel itself is fixed, but the shape of the parabolic mirror is changed according to the yearly solar altitude, and as the altitude of the sun changes, an asymmetric CPC can be designed.

1 is a view for explaining the angle of incidence according to the altitude of the sun according to an embodiment of the present invention.
2 is a graph showing the change of the incident angle according to the inclination of the solar cell panel according to an embodiment of the present invention.
3 is a view showing the open-circuit voltage characteristics of the solar cell according to the light condensing magnification according to an embodiment of the present invention.
Figure 4 is a schematic diagram for explaining the operation of the variable-shape composite parabolic solar light collector according to an embodiment of the present invention.
5 is a view for explaining a light collecting principle of a shape variable composite parabolic solar light collector according to an embodiment of the present invention.
6 is a view for explaining the structure of the variable-shape composite parabolic solar light collector according to the first embodiment of the present invention.
7 is a result of simulating the optical efficiency according to the first embodiment of the present invention.
8 is a view for explaining the structure of a variable-shape composite parabolic solar collector according to a second embodiment of the present invention.
9 is a result of simulating the optical efficiency according to the second embodiment of the present invention.
10 is a view for explaining the structure of the variable-shape composite parabolic solar light collector according to the third embodiment of the present invention.
11 is a result of simulating the optical efficiency according to the third embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view for explaining the angle of incidence according to the altitude of the sun according to an embodiment of the present invention.

One-dimensional CPC does not mean that the angle of incidence of the cross section does not change throughout the day. For example, even if one-dimensional CPCs are aligned east-west as shown in FIG. 130 and the winter 110, the sun orbit 131, 111 of the sun is outside the allowable angle of incidence most of the time except near the southern middle altitude. This problem is a problem to be solved in the present invention while at the same time limiting the performance of the one-dimensional CPC.

2 is a graph showing the change of the incident angle according to the inclination of the solar cell panel according to an embodiment of the present invention.

Figure 2 shows the angle of incidence from 6 am to 6 pm in winter (winter), summer (lower), and spring and autumn (Fall equinox), when the solar panels are aligned on the east-west axis and tilted by the local altitude. It is a graph showing whether it changes. The angle of incidence is constant in spring and autumn, but the change is severe in summer and winter. Since the actual amount of light is large during the daytime, the system design should be designed for the daytime (with less variation in the incident angle) and aimed at minimizing light loss in the morning and evening hours.

3 is a view showing the open-circuit characteristics of the solar cell according to the light condensing magnification according to an embodiment of the present invention.

As the photovoltaic magnification (C) is higher, it is well known that the open-circuit characteristic of the solar cell is increased, as shown in FIG. 3. As a result, a technique for maximizing voltage is widely used.

Hundreds of times high magnification condensation is not an object that can be achieved with one-dimensional CPC, and the present invention targets condensation magnifications of about 10 times, at least 2-3 times and as many as tens of times. As shown in the graph below, it can be seen that the photovoltaic conversion efficiency of the solar cell increases by several percent even with low magnification of the silicon solar cell.

Figure 4 is a schematic diagram for explaining the operation of the variable-shape composite parabolic solar light collector according to an embodiment of the present invention.

The CPC is designed so that two parabolic mirrors 411 and 412 put their focus on the opposite mirror so that the light can enter the entrance even if the angle of incidence of the light changes. According to an embodiment of the present invention, the actuator 420 installed at the top of the two parabolic mirrors 411 and 412 and the condenser entrance 430 are located at the bottom of the two parabolic mirrors 411 and 412. The angle of incidence angle can be adjusted by tilting each parabolic mirror.

When the tilted parabolic mirror is designed, the magnification actually appears to decrease slightly. However, in the case of the present invention, the width of the entrance is already fixed, and the period of the structure is constant, so the condensing magnification should be the same accordingly.

Accordingly, the present invention can design the CPC at a higher magnification than the desired target magnification target, and design the slope-specific CPC in such a manner as to control the concentration of the focus through truncation at each slope. A method of adjusting the condensing magnification by truncation at each slope will be described in more detail with reference to FIG. 5.

5 is a view for explaining a light collecting principle of a shape variable composite parabolic solar light collector according to an embodiment of the present invention.

Composite parabolic concentrator (CPC) according to an embodiment of the present invention is one of the most widely used configuration for solar condensing. Lenticular concentrators generally have one focal point and are very sensitive to changes in angle of incidence, but CPC concentrates the entire incident light in a given angle of incidence range since the two parabolas 510 and 520 have different focal points (F ₁ , F ₂ ). You can. The design procedure of the CPC is well known.

As shown in FIG. 5A, parabola 520 and parabola 510 that focus on F ₁ and F ₂ , respectively, are inclined toward each other by ± θ _t . F ₁ and F ₂ are the end points of the concentrated area, and the parabola below this point must be truncated (indicated by the dashed line).

The two axes L ₁ and L ₂ move to L ' ₁ and L' ₂ , respectively, and include F ₂ and F ₁ , where the intersection of L ' ₁ and parabola 510 and the intersection of L' ₂ and parabola 520 are CPC. Determine the other endpoint of. The parabola above this intersection must also be removed.

Since the parabola has a characteristic of focusing incident light parallel to the axis at the focal point, the incident light beam parallel to L ' ₂ (the same incident angle as θ _t ) is concentrated at F ₂ by the reflection of the parabola 510. As the angle of incidence decreases and becomes vertical, the light beam passes through the left region of F ₂ . This principle of operation also applies to parabola 520 and F ₁ , so that all incident light rays within ± θ _t pass through the region between F ₁ and F ₂ without loss. When the CPC is molded with a transparent material of refractive index n, the angle of incidence θ _a becomes θ _a = 2sin ^{− 1} (nsin (θ _t )) for _1D and C _1D = 1 / sin (θ _t ) by Snell's law. = n / sin (θ _a / 2), and for 2D, C _2D = 1 / sin ² (θ _t ) = n ² / sin ² (θ _a / 2).

6 is a view for explaining the structure of the variable-shape composite parabolic solar light collector according to the first embodiment of the present invention.

The proposed variable geometry composite parabolic solar collector includes a first mirror having a focal point at the second mirror and a second mirror having a focal point at the first mirror.

The first and second mirrors are designed to allow light to enter the entrance even when the incident angles of the light incident on the first and second mirrors are changed, and the allowable incidence angle range is adjusted by adjusting the inclination of the first and second mirrors. Adjust

According to a first embodiment of the present invention, the variable-shape composite parabolic solar light collector is the first mirror and the second mirror, and the first mirror and the second mirror are extendable mirrors, Correspondingly extended. In other words, if the CPC is made of a linear mirror instead of a parabola, the mirror is stretchable to flexibly cope with shape changes throughout the year.

Based on the point at which the light reflected by the first mirror is focused on the second mirror at each inclination of the first mirror and the second mirror, and the point where the light reflected on the second mirror is focused on the first mirror By cutting the first mirror and the second mirror can adjust the light condensing ratio.

The actuators of the first mirror and the second mirror are two-point linear mirrors using one actuator 610 installed only at the uppermost ends of the first mirror and the second mirror or actuators 621 and auxiliary actuators installed at the uppermost end. A three-point or three-point or more linear mirror with the addition of 622 can be used. When the number of points increases according to the number of auxiliary actuators 622, the accuracy can be increased accordingly.

7 is a result of simulating the optical efficiency according to the first embodiment of the present invention.

For each of the two-point linear mirror, the three-point linear mirror, and the 12-point linear mirror, a simulation result of optical efficiency according to the change of the incident angle, assuming that the CPC is inclined to the altitude of the sun, is shown in FIGS. 7 (a) and 7 ( b) and Fig. 7 (c) respectively. 7 (d) is a graph comparing optical efficiency with respect to points.

Here, C represents the condensing magnification, θ _t = tilt angle (= θ _a / 2). The tilt angle is the angle to tilt the parabolic mirror when designing the CPC. The larger the tilt angle, the wider the allowable incident angle. In the case of low magnification (C = 2), even with a straight line, optical efficiency of 95% or more (θ _t = 15 °) can be achieved.

In the case of C = 3, the optical efficiency is 90% (θ _t = 10 °) when the 3-point linear mirror is folded. The two-point linear mirror dropped slightly to 76%. From C = 5, it was difficult to achieve high optical efficiency with linear mirrors.

8 is a view for explaining the structure of a variable-shape composite parabolic solar collector according to a second embodiment of the present invention.

The proposed variable geometry composite parabolic solar collector includes a first mirror having a focal point at the second mirror and a second mirror having a focal point at the first mirror.

The first and second mirrors are designed to allow light to enter the entrance even when the incident angles of the light incident on the first and second mirrors are changed, and the allowable incidence angle range is adjusted by adjusting the inclination of the first and second mirrors. Adjust

Shape-variable composite parabolic solar light collector according to a second embodiment of the present invention, the first mirror and the second mirror includes an upper mirror and a lower mirror, respectively, the upper mirror and the lower mirror is a portion overlapping each other It includes.

In other words, the first mirror 810 includes an upper mirror 811 and a lower mirror 812, and the upper mirror 811 and the lower mirror 812 include portions overlapping each other. The second mirror 820 includes an upper mirror 821 and a lower mirror 822, and the upper mirror 821 and the lower mirror 822 include portions overlapping each other.

The first mirror 810 and the second mirror 820 is an actuator installed on top of the first mirror and the second mirror so that the structure and size of the first mirror and the second mirror is converted according to the elasticity of the rubber band ( 850) and a rubber band is attached between the condenser part, the upper mirror is attached to the rubber part, and a lower mirror is attached to the condenser part inlet.

The movement of the upper mirror changes as the actuator moves, the lower mirror leans against the upper mirror, and the upper mirror at the entrance of the condenser to increase the effect of the first mirror and the second mirror approximating the parabolic structure. The points fixing the lower mirror are spaced apart from each other.

More specifically, as shown in FIG. 8, when the CPC is overlapped with two mirrors, the length of the CPC may be changed even if the mirrors themselves are not extendable. For example, a rubber band is hung between the upper actuator and the lower condenser entrance, and an upper mirror is attached to the rubber band. In this case, even though the mirror itself is not extensible, the elasticity of the elastic allows the structure to be resized. On the other hand, if the lower mirror fixed at the entrance of the light collecting part can be leaned on the upper mirror, the lower surface which the upper mirror cannot cover is covered by the lower mirror and the entire mirror acts as a mirror.

In FIG. 8, the radius 830 of the circle means the size of the lower mirror, and the line 840 means a support (for example, a rubber band) that supports the upper mirror. As the upper actuator 850 moves, the shape of the line 840 changes, the lower mirror 850 is leaning against the line 840, and the mirror in which the line 840 and the line 850 are combined has a parabolic surface in the background. It is a similar form.

Here, the point 841 of the lower surface fixing the lines 840 is slightly separated from the condensing surface. In other words, the fixed point 851 of the lines 850 and the fixed point 841 of the lines 840 are different. This design maximizes the effect that the structure approximates to the parabolic structure.

Also, the bottom mirror may not necessarily be linear. Designed to have a slight curvature, the overall structure can be closer to the parabola.

The back parabolas in FIG. 8 represent the ideal parabolic CPC for the height of the sun throughout the year, with both parabolic mirrors at both extremes (ie summer and winter) being the maximum and the minimum, respectively. The radius 830 of the circle must be smaller than the minimum mirror size of these. This is because the length of the lower mirror should not be longer than the original parabolic surface.

9 is a result of simulating the optical efficiency according to the second embodiment of the present invention.

Simulation results optimized for each using the second embodiment of the present invention. The lower mirror is assumed to be parabolic with some curvature. The angle of tilting the parabolic mirror was 1.4 to 1.6 times greater than the change in altitude of the sun. The sun's south-high altitude varies only 23.5 degrees a year, but the morning and evening sun altitudes vary more than the south-high altitude. The allowable angle of incidence of CPC was designed to be 5 ~ 10 degrees according to magnification.

As a result of the simulation, even in the spring and autumn, even if the magnification was increased to C = 10, the optical efficiency was relatively high all day. On the other hand, in the summer and winter, the optical efficiency decreased as the magnification increased.

Even if the optical efficiency is slightly reduced, the condensing effect is still effective. For example, in the case of 10 times condensing, if the optical efficiency is 70%, the solar cell receives 7 times the light. In other words, the economic effect still exists.

10 is a view for explaining the structure of the variable-shape composite parabolic solar light collector according to the third embodiment of the present invention.

The proposed variable geometry composite parabolic solar collector includes a first mirror having a focal point at the second mirror and a second mirror having a focal point at the first mirror.

The first and second mirrors are designed to allow light to enter the entrance even when the incident angles of the light incident on the first and second mirrors are changed, and the allowable incidence angle range is adjusted by adjusting the inclination of the first and second mirrors. Adjust

According to a third embodiment of the present invention, the variable-shape composite parabolic solar collector is a first mirror and a second mirror, which is a parabolic metal mirror, and adjusts the inclination of the first mirror and the second mirror. In other words, the CPC can be made from a parabolic metal mirror from scratch and the entire mirror tilted.

As the CPC is inclined, the length of the two mirrors is severely changed, so a flexible structure is required. However, as a result of the modification of the CPC design to minimize the length change of the two mirrors, as shown in FIG. It could be designed to change. In FIG. 10, the solid line represents the CPC shape (within 5% of the length change) according to the altitude change throughout the year, and the dotted line represents the case where the actual metal mirror is along the parabolic surface. It can be seen that the left mirror is leaning against the right mirror, and due to the difference in length, the right mirror is more protruding than the left mirror (circled 1010).

The shape-variable composite parabolic solar collector according to the embodiments of the present invention described above may be manufactured by coating a metal including silver and aluminum on glass, plastic, or a metal plate.

11 is a result of simulating the optical efficiency according to the third embodiment of the present invention.

This is a result of measuring year-round performance with the angler margin (= permissible incident angle / 2) at 5 degrees and tilting the CPC designed for a magnification of 10 to 30 degrees. Annual angle = 0 means spring and autumn, and 23.5 degrees means summer and winter. That is, if the graph of FIG. 11 is interpreted, the slope of CPC is set at 0 degree (rigid0) in spring and autumn, and it is gradually inclined at 5 degrees, 10 degrees, etc. as time passes (about 2-3 weeks interval), and in summer or winter. It may be used by tilting it to 25 to 30 degrees.

In this way, by moving the structure whenever the sun's altitude changes by about 5 degrees, it is possible to utilize the condensing system without a separate daily light tracking with only 20 movements or less per year.

The optical efficiency was about 60% in summer and winter. Since the magnification is 10, this means that the solar cell can receive light about 6 times the area.

According to an embodiment of the present invention, by changing the shape of the CPC throughout the year, it is possible to design a system that can collect sunlight without daily light tracking (daily light tracking). The mirror of the proposed variable-shape complex parabolic solar collector can be manufactured by coating various metals such as silver and aluminum on glass, plastic, and metal plate. Solar cells can be used for all kinds of solar cells such as silicon, group III-V, thin film, or solar power generation. The transformation can drive the actuators electrically, or the user can manually move them. Since it is not daily light tracking, it is advantageous that the user does not have a heavy burden.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the devices and components described in the embodiments may be, for example, processors, controllers, arithmetic logic units (ALUs), digital signal processors, microcomputers, field programmable arrays (FPAs), It may be implemented using one or more general purpose or special purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to the execution of the software. For convenience of explanation, one processing device may be described as being used, but one of ordinary skill in the art will appreciate that the processing device includes a plurality of processing elements and / or a plurality of types of processing elements. It can be seen that it may include. For example, the processing device may include a plurality of processors or one processor and one controller. In addition, other processing configurations are possible, such as parallel processors.

The software may include a computer program, code, instructions, or a combination of one or more of the above, and configure the processing device to operate as desired, or process it independently or collectively. You can command the device. Software and / or data may be any type of machine, component, physical device, virtual equipment, computer storage medium or device in order to be interpreted by or to provide instructions or data to the processing device. It can be embodied in. The software may be distributed over networked computer systems so that they may be stored or executed in a distributed manner. Software and data may be stored on one or more computer readable recording media.

The method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

Although the embodiments have been described by the limited embodiments and the drawings as described above, various modifications and variations are possible to those skilled in the art from the above description. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are within the scope of the claims that follow.

Claims (10)

A first mirror having a focal point at the second mirror; And
A second mirror in focus of the first mirror
Including,
The first mirror and the second mirror,
Is designed to allow light to enter the entrance even if the incident angle of the light incident to the first mirror and the second mirror is changed,
By adjusting the inclination of the first mirror and the second mirror to adjust the allowable angle of incidence range
Solar concentrator. The method of claim 1,
The first mirror and the second mirror are linear mirrors, the first mirror and the second mirror are extendable mirrors and extend in response to year-round shape changes.
Solar concentrator. The method of claim 2,
Based on the point at which the light reflected by the first mirror is focused on the second mirror at each inclination of the first mirror and the second mirror, and the point where the light reflected on the second mirror is focused on the first mirror By cutting the first mirror and the second mirror to adjust the condensing magnification
Solar concentrator. The method of claim 2,
The actuator of the first mirror and the second mirror uses a two-point linear mirror installed only at the top of the first mirror and the second mirror or a three-point or more linear mirror with an auxiliary actuator.
Solar concentrator. The method of claim 1,
The first mirror and the second mirror include an upper mirror and a lower mirror, respectively, and the upper mirror and the lower mirror include portions overlapping each other.
Solar concentrator. The method of claim 5,
The first mirror and the second mirror,
Hanging a rubber band between an actuator installed on the top of the first mirror and the second mirror and the condenser inlet so that the structure and size of the first mirror and the second mirror is converted according to the elasticity of the rubber band, the upper portion of the rubber band Attaching a mirror, and attaching a lower mirror to the condenser entrance
Solar concentrator. The method of claim 5,
As the actuator moves, the movement of the upper mirror changes, the lower mirror is leaning against the upper mirror,
In order to increase the effect that the first mirror and the second mirror approximate the parabolic structure, the points for fixing the upper mirror and the lower mirror at the entrance of the condenser are separated from each other.
Solar concentrator. The method of claim 5,
The bottom mirror is a linear mirror or curved mirror
Solar concentrator. The method of claim 1,
The first mirror and the second mirror are curved mirrors, and adjusting the inclination of the first mirror and the second mirror
Solar concentrator. The method of claim 1,
The first mirror and the second mirror is produced by coating a metal containing aluminum on glass, plastic or metal plate
Solar concentrator.

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