KR102188580B1 - Apparatus and device for generating solar power based on functional waveguide structure and solar window including the same - Google Patents

Abstract

A window-type solar power generation device using a functional optical waveguide and a solar cell window including the same are disclosed, and a window-type solar power generation device using the functional optical waveguide includes a condensing lens layer that condenses sunlight incident from the upper side to the lower side, A plurality of curvatures that are spaced apart from the condensing lens layer and provided to collect at least a portion of the light that has passed through the condensing lens layer and entered from the upper side through a curvature-type reflective surface and collects it toward the edge through the internal optical waveguide It may include an optical waveguide light-converging layer including a type reflector, and a solar cell array disposed to face the edge of the light-guided light-converging layer.

Description

A window-type solar power generation device using a functional optical waveguide and a solar cell window including the same {APPARATUS AND DEVICE FOR GENERATING SOLAR POWER BASED ON FUNCTIONAL WAVEGUIDE STRUCTURE AND SOLAR WINDOW INCLUDING THE SAME}

The present application relates to a window-type solar power generation device using a functional optical waveguide and a solar cell window including the same.

A solar concentrator and a window-type solar power generation system are systems that change the path of sunlight and direct it to a solar cell.

However, in general solar concentrators and windows-type solar power generation systems, the ratio of light collected by the edge of the light waveguide layer is low, and power conversion efficiency is lowered.

In addition, since conventional solar concentrators and windows-type solar power generation systems use a reflector having a flat structure such as a simple triangle or trapezoid, when it is refracted by a lens and collected and reflected by a flat reflector, it is incident on the reflector surface. Since the direction of the reflected light is determined by Fresnel's eq. according to the direction of the light (light) being reflected, there is a limitation that it cannot be reflected at a certain angle and direction. That is, when the light collected by the plane reflector is reflected, it is emitted again.

In this way, light (light) emitted and reflected from the reflector may cause loss of light (light) as it travels through the optical waveguide and passes out of the condition of total reflection on the optical waveguide surface and is transmitted out of the optical waveguide layer or re-reflected to another adjacent reflector.

The technology behind the present application is disclosed in Korean Patent Publication No. 10-17020651.

The present application is to solve the problems of the prior art described above, by maintaining the light condensed by the edge of the optical waveguide to be reflected at a desired angle while maintaining the total reflection condition of the optical waveguide, at the edge of the optical waveguide. It aims to collect a large amount of light (light) efficiently.

However, the technical problem to be achieved by the embodiments of the present application is not limited to the technical problems as described above, and other technical problems may exist.

As a technical means for achieving the above technical problem, the window-type solar power generation device using a functional optical waveguide according to an embodiment of the present application includes a condensing lens layer for condensing sunlight incident from an upper side to a lower side, and the condensing lens A plurality of curved reflectors disposed at a lower side of the layer and provided to collect at least a portion of the light passing through the condensing lens layer and entering from the upper side through the curvature-type reflective surface to collect it toward the edge through the optical waveguide path therein. It may include an optical waveguide condensing layer including and a solar cell array disposed opposite to the edge of the optical waveguide condensing layer.

In addition, the curved reflective surface may be formed with a predetermined curvature so that the reflected light proceeds while satisfying a total reflection condition in the optical waveguide light collecting layer.

In addition, the condensing lens layer may include a plurality of upwardly convex lenses.

In addition, one of the plurality of curvature-type reflectors may be provided so as to correspond to one of the plurality of upwardly convex lenses in a vertical direction.

Further, the focal point of the plurality of upwardly convex lenses may be positioned below the curvature-type reflective surface.

In addition, the curved reflective surface may be formed to reflect at least some of the light passing through the corresponding upwardly convex lens and reaching the focus at an angle satisfying the total reflection condition.

In addition, when the light condensed by the condensing lens layer is to be collected by one edge positioned on one side in the width direction of the optical waveguide condensing layer, the upwardly convex protruding shape of the curvature-type reflective surface is a pole with the focus as an origin. Based on the coordinate system, a total reflection condition for setting a reflection angle so that the light reflected from the curved reflective surface can proceed with total reflection in the optical waveguide, and an angular range condition for covering at least some of the light incident through the condensing lens layer In consideration of, it may be formed to be reflected at a reflection angle that satisfies the total reflection condition within an angle range that satisfies the angular range condition.

In addition, the upwardly convex protruding shape of the curved reflective surface may be formed in consideration of a non-interference condition in which the reflected light does not interfere with a neighboring curved reflector adjacent to one side in the width direction.

In addition, the angular component of each point of the upwardly convex protruding shape has a range that satisfies Equation 1 below, and the radius component of each point of the upwardly convex protruding shape corresponding to the angular component is from the origin satisfying Equation 2 below. Can be determined based on the distance function of.

In addition, the first angle, which is the minimum value among the angular components of each point of the upward convex protrusion shape, and the second angle, which is the maximum value among the angular components of each point of the upward convex protrusion shape, are on the width direction axis of the polar coordinate system with the focal point as the origin. It may be measured based on a counterclockwise direction with a direction toward the edge of the other side positioned at the other side in the width direction of the optical waveguide light collecting layer at 0 degrees.

In addition, the output angle, which is an angle that satisfies the total reflection condition, is a clockwise direction with a direction toward one edge located at one side in the width direction of the optical waveguide condensing layer on the width direction axis of the polar coordinate system with the focus as the origin. It can be measured on the basis of.

In addition, the angular range condition may be a condition to be determined in a range in which the first angle and the second angle satisfy Equations 3 to 5 below.

In addition, the non-interference condition may be a condition in which the neighboring curvature type reflector is spaced apart from the curvature type reflector so as to satisfy Equation 6 below based on the width direction.

In addition, the total reflection condition may be a condition to be determined in a range in which the output angle satisfies Equations 7 to 9 below.

In addition, the curvature type reflector may include a first curvature type reflector and a second curvature type reflector.

In addition, the curvature-type reflective surface of the first curvature-type reflector has a reference height in the vertical direction of the other side so that the light collected by the condensing lens layer is collected at one edge of the optical waveguide condensing layer. May be higher.

In addition, the curvature-type reflective surface of the second curvature-type reflector has a vertical reference height of one side and a vertical reference height of the other side so that the light collected by the condensing lens layer is collected by the other edge of the optical waveguide condensing layer. May be higher.

In addition, the window type photovoltaic device according to the exemplary embodiment of the present application includes a plurality of the first curved reflectors in one direction based on the center of the width direction of the optical waveguide light collecting layer, and a plurality of the first curved reflectors in the other direction. Of the second curvature type reflector may be provided.

In addition, the window-type photovoltaic device according to an exemplary embodiment of the present disclosure includes the number of the plurality of first curvature-type reflectors so that the amount of light collected by one edge of the light waveguide layer and the amount of light collected by the other edge are different. And different numbers of the plurality of second curvature type reflectors may be provided.

In addition, the window-type photovoltaic device according to the embodiment of the present application, so that the amount of light collected by one edge of the light waveguide layer and the amount of light collected by the other edge are different from the center of the width direction of the optical waveguide condensing layer. A plurality of the first curvature type reflectors may be provided in one direction based on a point spaced apart in one direction or the other direction by a predetermined distance, and a plurality of the second curvature type reflectors may be provided in the other direction.

On the other hand, the solar cell window according to an embodiment of the present application is provided to surround the edge so that the outflow of light collected toward the edge side of the window-type solar power generation device and the light wave collecting layer is blocked, and the inner part is provided with the It may include an edge frame on which the solar cell array is disposed.

The above-described problem solving means are merely exemplary and should not be construed as limiting the present application. In addition to the above-described exemplary embodiments, additional embodiments may exist in the drawings and detailed description of the invention.

According to the above-described problem solving means of the present application, the incident light can be reflected while maintaining a desired angle and direction while maintaining the total reflection condition of the optical waveguide in at least a part of the plurality of curvature reflectors, so that it can be efficiently reflected at the edge of the optical waveguide. Since a large amount of light may be collected, loss of light may be reduced compared to the prior art, and a condensing rate may be increased.

According to the above-described problem solving means of the present application, by adjusting the number ratio of the first curvature type reflector and the second curvature type reflector in different directions of light collection, or by adjusting the distance between the curvature type reflectors, the light is condensed at both ends of the light waveguide condensing layer By controlling the amount of light generated, the ratio of the power generated at both ends can be set differently.

However, the effect obtainable in the present application is not limited to the effects as described above, and other effects may exist.

1 is a schematic cross-sectional view of a window-type solar power generation device using a functional optical waveguide according to an embodiment of the present application.
FIG. 2 is a schematic cross-sectional view illustrating a traveling path of light reflected by one curved reflector and condensed to an edge in an optical waveguide.
3 is a diagram for explaining a constraint that must be satisfied in order to determine an upwardly convex protruding shape of a curved reflective surface.
4 is a diagram for describing a condition for total reflection of light reflected from a curved reflective surface.
5 is a diagram for explaining a relationship between an incidence angle and a reflection angle on a curved reflective surface.
6 is a diagram for explaining a change in a distance to a curved reflective surface according to a local change in an incident angle.
7 is a diagram for explaining a distance function from a focal point of an upwardly convex lens to each point on a curved reflective surface.
8 is a schematic cross-sectional view illustrating an embodiment of a first curvature type reflector and a second curvature type reflector.
9 is a schematic three-dimensional view of a solar cell window including a window-type solar power generation device using a functional optical waveguide according to an embodiment of the present application.
10A is a schematic cross-sectional view illustrating a path of light collected by a window-type solar power generation device having a conventional planar reflector.
10B is a schematic cross-sectional view illustrating a path of light condensed by a window-type photovoltaic device using a functional optical waveguide according to an embodiment of the present application.
11A is a schematic cross-sectional view showing a path of light reflected from a point of a conventional planar reflector.
FIG. 11B is a schematic cross-sectional view illustrating a path of light reflected from one curved reflector in a window-type solar power generation device using a functional optical waveguide according to an embodiment of the present application.
12 is an experimental example in connection with a window-type solar power generation device using a functional optical waveguide according to an embodiment of the present application, and a conventional window-type solar power generation device using a functional optical waveguide according to an embodiment of the present application This is a graph comparing the transmittance, reflectance, and edge collection rate according to the position of the reflector in the optical waveguide of a window-type solar power generation device having a planar reflector.

Hereinafter, exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present application. However, the present application may be implemented in various different forms and is not limited to the embodiments described herein. In addition, in the drawings, parts not related to the description are omitted in order to clearly describe the present application, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the present specification, when a part is said to be "connected" with another part, it is not only "directly connected", but also "electrically connected" or "indirectly connected" with another element interposed therebetween. "Including the case.

Throughout this specification, when a member is positioned "on", "upper", "upper", "under", "lower", and "lower" of another member, this means that a member is located on another member. It includes not only the case where they are in contact but also the case where another member exists between the two members.

Throughout the specification of the present application, when a certain part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

For reference, in the description of the embodiments of the present application, terms (upward, downward, etc.) related to directions or positions are described based on the arrangement state of each component shown in the drawings. For example, as seen in FIG. 1, an upward direction may be a 12 o'clock direction, a downward direction may be a 6 o'clock direction, one width direction may be a 9 o'clock direction, and the other direction in the width direction may be a 3 o'clock direction.

However, this direction setting may vary depending on the arrangement state of the present apparatus. For example, if necessary, it may be arranged such that the upward direction of FIG. 1 faces a horizontal direction or an oblique oblique direction, and one width direction faces an up-down direction or an oblique oblique direction.

In addition, the meaning of the term width direction used throughout the present specification may mean a direction indicating a transverse direction, a horizontal direction, etc. according to the arrangement state of the present apparatus.

The present application relates to a window-type solar power generation device using a functional optical waveguide and a solar cell window including the same. Here, the window-type photovoltaic device according to the exemplary embodiment of the present disclosure may be applied to a solar concentrator and a window-type solar cell device (system), but the application field is not limited thereto. That is, it goes without saying that the window-type solar power generation device using the functional optical waveguide according to the exemplary embodiment of the present application can be applied to various systems (devices) that condens light through an edge.

1 is a schematic cross-sectional view of a window-type solar power generation device using a functional optical waveguide according to an embodiment of the present application.

Referring to FIG. 1, a window-type solar power generation device 1 using a functional optical waveguide according to an embodiment of the present application includes a condensing lens layer 100, an optical waveguide condensing layer 200, and a solar cell array 300. It may include.

The cross section of the condensing lens layer 100 shown in FIG. 1 may be a cross section of a plurality of spherical condensing lenses (2D lens array), as shown in FIG. 9 to be described later, but is not limited thereto. For example, it may be a cross section of a plurality of cylindrical (Cylindrical) condensing lenses (1D lens array).

FIG. 2 is a schematic cross-sectional view illustrating a traveling path of light reflected by one curved reflector and condensed to an edge in an optical waveguide.

Referring to Figure 2, the window type solar power generation device 1 using a functional optical waveguide according to an embodiment of the present application, the condensing lens layer 100 condenses the sunlight 600 incident from the upper side to the lower side , The light reflected by the curvature-type reflector 210 provided in the optical waveguide condensing layer 200 satisfies the total reflection condition, proceeds through the optical waveguide in the optical waveguide condensing layer 200, and the edge of the optical waveguide condensing layer 200 The light may be collected by condensing the solar cell array 300 disposed adjacent to and.

The condensing lens layer 100 may condense sunlight incident from the upper side to the lower side.

In addition, the condensing lens layer 100 may include a plurality of upwardly convex lenses 110.

Here, the focal length of each of the plurality of upwardly convex lenses 110 and the distance between the lenses, which is a degree that each of the plurality of upwardly convex lenses are spaced apart in the width direction, are in accordance with the embodiment of the window-type photovoltaic device 1 according to the present application. Therefore, they can have the same or different values.

For example, the plurality of upwardly convex lenses 110 may have the same focal length ( F ), but each of the plurality of upwardly convex lenses may be spaced apart at different intervals in the width direction.

The cross-section of the condensing lens layer 100 shown in FIG. 2 may be a cross-section of a plurality of spherical condensing lenses (2D lens array), as shown in FIG. 9 to be described later, but is not limited thereto. For example, it may be a cross section of a plurality of cylindrical (Cylindrical) condensing lenses (1D lens array).

In addition, the focal point of the plurality of upwardly convex lenses 110 may be located below the curved reflective surface 211.

The optical waveguide condensing layer 200 may be spaced apart from the condensing lens layer 100, and at least part of the light that has passed through the condensing lens layer 100 and entered from the upper side is totally reflected by the curved reflective surface 211 Thus, it may include a plurality of curvature type reflectors 210 that are provided to collect them toward the edge through the optical waveguide path therein.

In addition, one of the plurality of curvature-type reflectors 210 may be provided so as to correspond to one of the plurality of upwardly convex lenses 110 in the vertical direction.

In addition, the curved reflective surface 211 may be formed with a predetermined curvature so that the reflected light proceeds while satisfying the total reflection condition in the optical waveguide light collecting layer 200.

In addition, the curved reflective surface 211 may be formed to reflect at least some of the light passing through the upwardly convex lens 110 corresponding thereto and reaching the focus at an angle satisfying the total reflection condition.

In addition, when the light condensed by the condensing lens layer 100 is to be collected by one edge 250 positioned at one side in the width direction of the optical waveguide condensing layer 200, the upward convex protrusion shape of the curved reflective surface 211 Silver, based on the polar coordinate system with the focal point 111 of the upwardly convex lens 110 as the origin, the total reflection condition in which the reflection angle is set so that the light reflected from the curved reflective surface 211 can proceed in total reflection within the optical waveguide And a reflection angle that satisfies the total reflection condition within an angle range that satisfies the angular range condition in consideration of an angular range condition that covers at least a part of the light incident through the condensing lens layer 100. I can.

In addition, the upwardly convex protruding shape of the curvature type reflective surface 211 may be formed in consideration of a non-interference condition in which the reflected light does not interfere with neighboring curvature type reflectors adjacent to one side in the width direction.

3 is a diagram for explaining a constraint that must be satisfied in order to determine an upwardly convex protruding shape of a curved reflective surface.

Referring to FIG. 3, the upwardly convex protruding shape of the curved reflective surface 211 is, in consideration of the total reflection condition, the angular range condition, or the non-interference condition, the output angle 10, the first angle 20, It may be determined by determining the second angle 30, setting a polar coordinate system using the focal point 111 of the upwardly convex lens 110 as an origin, and defining a distance function from the origin.

The cross-section of the condensing lens layer 100 shown in FIG. 3 may be a cross-section of a plurality of spherical condensing lenses (2D lens array), as shown in FIG. 9 to be described later, but is not limited thereto. For example, it may be a cross section of a plurality of cylindrical (Cylindrical) condensing lenses (1D lens array).

In addition, the angular component of each point of the upwardly convex protruding shape may have a range satisfying Equation 1 below.

[Equation 1]

In addition, a radius component of each point of the upwardly convex protrusion corresponding to the angular component may be determined based on a distance function from an origin satisfying Equation 2 below.

[Equation 2]

Here, θ _ini is a first angle (20), which is a minimum value among angular components of each point of the upwardly convex protruding shape, θ _fin, is a second angle (30), which is a maximum value among angular components of each point of the upwardly convex protruding shape, r (θ) may indicate a distance function from the origin, and θ ₀ may indicate an output angle 10 that is an angle that satisfies the total reflection condition.

In addition, referring to FIG. 3, the first angle 20 and the second angle 30 refer to the other side edge located on the other side in the width direction of the optical waveguide on the width direction axis of the polar coordinate system with the focal point as the origin. It can be measured based on a counterclockwise direction with a direction of 0 degrees.

In addition, referring to FIG. 3, the first angle 20 is geometrically 0 degrees in a direction toward the other edge located on the other side in the width direction of the optical waveguide condensing layer on the width direction axis of the polar coordinate system with the focus as the origin. Therefore, it may be an angle toward the maximum point 212 in the vertical direction of the curved reflective surface 211 based on the counterclockwise direction.

In addition, referring to FIG. 3, the second angle 30 is a direction toward the other edge located on the other side in the width direction of the optical waveguide on the width direction axis of the polar coordinate system with the focal point as the origin. It may be an angle toward the lowest reference point 213 in the vertical direction of the curved reflective surface 211 based on the counterclockwise direction.

However, the measurement method for the first angle 20 and the second angle 30 described above may be different depending on the light collection direction, which is the direction in which the light reflected by the curved reflective surface 211 is directed. When the light condensed by the condensing lens layer 100 is to be collected by the other edge 260 located on the other side in the width direction of the optical waveguide condensing layer 200, the first angle 20 and the second angle 30 May be measured based on a clockwise direction with a direction toward one edge positioned at one side of the width direction of the optical waveguide layer on the width direction axis of the polar coordinate system with the focal point as the origin.

In addition, referring to FIG. 3, the output angle 10 is clockwise with a direction toward one edge located at one side in the width direction of the optical waveguide on the width direction axis of the polar coordinate system with the focus as the origin. It can be measured on the basis of.

However, the measurement method for the above-described output angle 10 may be different depending on the direction of light collection, which is the direction in which the light reflected by the curvature-type reflective surface 211 is directed, and if the condensing lens layer 100 In the case of collecting the collected light to the other edge 260 located on the other side in the width direction of the optical waveguide light collecting layer 200, the output angle 10 is the luminous intensity on the width direction axis of the polar coordinate system with the focus as the origin. It may be measured based on a counterclockwise direction with a direction toward the other edge positioned at the other side in the width direction of the wave light collecting layer at 0 degrees.

According to the window type photovoltaic device 1 using the functional optical waveguide according to the present application, the output angle 10, which is the angle of the reflected light reflected from the curved reflective surface 211, is the entire area of the curved reflective surface 211 Can be determined at the same angle.

However, it is preferable that the above-described same angle is not meant to be exactly the same, but is understood as a category including substantial identity that can be recognized as the same within a certain error range.

In addition, the curved reflective surface 211 must be able to reflect the entire light (light) that is condensed by the upwardly convex lens 110 and then passes through the optical waveguide layer 200 as it is to the optical waveguide layer 200. It is possible to prevent the occurrence of loss due to the presence of light (light) that cannot be collected toward the edge side of, and the above-described effect is because the first angle 20 and the second angle 30 satisfy the angular range condition. Can be achieved.

Specifically, the angular range condition is that θ _{l, which} is the angle at which the incident light is condensed by the upwardly convex lens 110 and is refracted at the largest angle, is between the first angle 20 and the second angle 30 It can mean a condition to be included in the range.

That is, the angular range condition may mean a condition to be determined in a range in which the first angle 20 and the second angle 30 satisfy Equations 3 to 5 below.

[Equation 3]

[Equation 4]

[Equation 5]

Here, d _l is the width of the upwardly convex lens based on the width direction, F is the focal length of the upwardly convex lens 110, θ _l is the maximum incident angle of light incident through the upwardly convex lens 110, θ _{ini Denotes} a first angle 20 and θ _fin denotes a second angle 30, respectively.

According to Equation 4, the first angle 20 may have a range of values smaller than a value obtained by subtracting θ _l from 90 degrees.

According to Equation 5, the second angle 30 may have a range of greater than 90 degrees plus θ _l .

Next, when the non-interference condition is described, the non-interference condition may be a condition in which the neighboring curvature type reflector is spaced apart from the curvature type reflector 210 so as to satisfy Equation 6 below with respect to the width direction.

[Equation 6]

Here, θ ₀ may denote an output angle 10, H denotes a vertical reference protrusion height of the neighboring curvature type reflector, and L denotes a distance to be spaced apart.

Specifically, when some of the light (light) reflected by one curvature-type reflector 211 enters the curvature-type reflective surface of the neighboring curvature-type reflector, the light (light) is transmitted from the neighboring curvature-type reflector. Since there is a possibility of reflection at an angle that does not satisfy the total reflection condition, it does not reach the edge side of the optical waveguide condensing layer 200, and loss of light (light) may occur.

Therefore, the case where the light reflected by the curvature type reflective surface 211 is incident on the curvature type reflective surface of the neighboring curvature type reflector should be minimized.

In addition, referring to Figure 3, the H can be calculated by the following equation 6-1.

[Equation 6-1]

In addition, referring to Figure 3, the L can be calculated by the following equation 6-2.

[Equation 6-2]

In Equations 6-1 and 6-2, θ _ini is the first angle (20), θ _fin is the second angle (30), and r(θ _ini ) is the first angle in the distance function from the origin. As a result of substituting (20), it may be the distance from the focal point 111 of the upwardly convex lens to the highest point 212 of the curvature-type reflective surface, and r(θ _fin ) is the second angle ( As a result of substituting 30), it may be the distance from the focal point 111 of the upwardly convex lens to the lowest point 213 of the curved reflective surface, and d is the focus 111 of the upwardly convex lens and the width direction of the upwardly convex lens. It may be a distance between focal points of other upwardly convex lenses adjacent to one side.

However, the d value in Equation 6-2 may be defined differently according to the light collection direction, and specifically, in the case of collecting light with the other edge located on the other side in the width direction of the optical waveguide condensing layer 200, It may be defined as the distance between the focal point 111 of the upwardly convex lens and the focal point of the upwardly convex lens and other upwardly convex lens adjacent to the other side in the width direction. In this case, L is the curvature type reflector 210 and the other in the width direction. It may mean a distance at which neighboring curvature type reflectors adjacent to the side are spaced apart from each other to satisfy Equation 6 based on the width direction.

Next, when the total reflection condition is described, the total reflection condition may be a condition to be determined within a range in which the output angle 10 satisfies Equations 7 to 9 below.

[Equation 7]

[Equation 8]

[Equation 9]

Here, n ₁ is the refractive index of the medium between the condensing lens layer 100 and the optical waveguide condensing layer 200, n ₂ is the refractive index of the medium forming the optical waveguide condensing layer 200, and θ _c is the optical waveguide condensing The critical angle of total reflection within the layer 200, θ ₀ , may be the output angle 10.

4 is a diagram for describing a condition for total reflection of light reflected from a curved reflective surface.

Referring to FIG. 4, when light (light) proceeds from medium 2 ( n ₂ ) to medium 1 ( n ₁ ), the critical angle ( θ _c ) may be determined by Equation 7 above, and the critical angle at which total reflection occurs. Since Equation 7 is obvious to a person skilled in the art, a detailed description is omitted.

In addition, the light (light) reflected from the curved reflective surface 211 must satisfy Equation 8 above by area ① of FIG. 4 and Equation 9 above by area ② of FIG. 4. Accordingly, the output angle θ ₀ may be determined within an angle range that satisfies both Equations 8 and 9 above.

Hereinafter, a process of deriving the distance function from the origin through FIGS. 5 to 7 will be described.

5 is a diagram for explaining the relationship between the angle of incidence and the angle of reflection on a curved reflective surface

Referring to FIG. 5, when light (light) passing through the upwardly convex lens 110 enters the focal position (A) (green straight line, incident angle θ _i ), a point (B) of the curved reflective surface 211 ) At a specific output angle ( θ ₀ ) (yellow straight line), when the angle at which the curvature-type reflective surface 211 is inclined ( θ _M ) is set, Fresnel's eq. can be established.

When the angle of incidence of light (light) incident on a point (B) of the curved reflective surface 211 is expressed as the angle of incidence to the focal position (A) and the angle at which the curved reflective surface is inclined, θ _i - θ _M becomes When the reflection angle of light (light) reflected from a point B of the curvature type reflective surface 211 is expressed as the output angle and the angle at which the curvature type reflective surface is inclined, it becomes θ ₀ + θ _M.

In addition, since θ _i - θ _M = θ ₀ + θ _M is satisfied by Snell's law that the angle of incidence and the angle of reflection are the same, θ _M = 0.5 ( θ _i - θ ₀ ).

6 is a diagram for explaining a change in a distance to a curved reflective surface according to a local change in an incident angle.

6, the distance from the focal point A of the upwardly convex lens according to the change of θ _i in the entire area of the curvature-type reflective surface 211 that satisfies θ _M = 0.5 ( θ _i - θ ₀ ) described above When is determined, the moving path of the point B of the curvature type reflective surface 211 can be known, and by connecting this, the entire upwardly convex protruding shape of the curvature type reflective surface 211 can be obtained.

θ로 광(빛)이 입사할 때의 초점(A)로부터 곡률형 반사면(211)까지의 거리를 각각 r(θ _i ) 및 r(θ _i +

θ)라 하면, 도6의 삼각형 ABC에서 사인 법칙에 의해 하기 식2-1내지 식 2-4을 만족한다.Upwardly focus of the convex lens (A) by an angle θ _i to the optical focal point (A) of the upwardly convex lens to the incident (light) angles θ _i +

The distances from the focal point (A) when light (light) is incident to θ to the curved reflective surface 211 are r(θ _i ) and r ( θ _i +

If θ ), the following equations 2-1 to 2-4 are satisfied by the sinusoidal law in the triangle ABC of FIG. 6.

[Equation 2-1]

[Equation 2-2]

[Equation 2-3]

[Equation 2-4]

Also, the above-described θ _M = 0.5 satisfies _{θ M = 0.5 (θ i +} θ 0) - - θ i by a relationship of (θ _i θ _0).

Therefore, Equation 2-4 can be converted to Equation 2-5 below.

[Equation 2-5]

Finally, by performing the integration for the above equation, the distance function r(θ) from the origin of Equation 2 can be derived.

[Equation 2]

7 is a diagram for explaining a distance function from a focal point of an upwardly convex lens to each point on a curved reflective surface.

Referring to FIG. 7, the curved reflective surface 211 may be formed by a distance function r(θ) from the focal point 111 of an upwardly convex lens determined for each θ satisfying the angular range of Equation 1 above. have. That is, between the by loading a focus 111 in the upward convex lens expressed in polar form (θ _ini, r (θ _ini)) and (θ _fin, r (θ _fin)) (θ, r (θ)) The whole may represent the upwardly convex shape of the curved reflective surface 211.

In addition, according to an embodiment of the present application, the condensing lens layer 100 may be provided with a plurality of spherical condensing lenses (2D lens array) as described above, and in this case, the curvature type reflector 210 is shown in FIGS. The shape (eg, curvature or direction) of the curvature-type reflective surface may be determined within a range that satisfies the above-described predetermined equation for not only the width direction shown in FIG. 3 but also the width direction perpendicular to the width direction. . In other words, the design of the curvature type reflector in consideration of the total reflection condition, the angular range condition, the non-interference condition, and the like presented herein is not only for the edge facing the width direction but also for the edge facing the orthogonal width direction. It can be applied two-dimensionally to collect light condensed by the condensing lens layer 100.

In addition, according to another embodiment of the present application, the condensing lens layer 100 may be provided with a plurality of cylindrical condensing lenses (1D lens array) as described above, and in this case, the total reflection condition presented herein, The design of the curvature type reflector in consideration of the angular range condition, the non-interference condition, etc. is to collect the light condensed by the condensing lens layer 100 with respect to the edge facing the width direction shown in FIGS. 1 to 3. It can be applied in one dimension.

That is, the curved reflective surface 211 of the curved reflector 210 of the window-type solar power generation device 1 using the functional optical waveguide according to an embodiment of the present application is an upward convex lens 110 and the upward convex lens. Is provided between the focal points 111 of, and each point of the curvature-type reflective surface is determined by an angle ( θ ) centered on the focal point 111 of the upwardly convex lens and a distance function r(θ) corresponding to the angle. It is formed in an upwardly convex shape, while simultaneously satisfying the total reflection condition and the non-interference condition in the optical waveguide condensing layer 200 and reflecting light at the same output angle 10 to be adjacent to the edge of the optical waveguide condensing layer 200 The solar cell array 300 that is arranged so that it is possible to condensate light (for example, sunlight) incident from the top, so that the window-type solar power generation device 1 using a functional optical waveguide according to an embodiment of the present application By, the light collection rate can be significantly improved than in the conventional Taekwang power plant.

In addition, the curved reflecting surfaces of each of the curvature type reflectors 210 of the window type photovoltaic device 1 using a functional optical waveguide according to an exemplary embodiment of the present application are provided in a shape within a range that satisfies the above-described predetermined equation. Can be.

For example, the curvature-type reflective surfaces of each of the plurality of curvature-type reflectors 210 may all have the same shape assuming that the above-described predetermined equation is satisfied.

However, the shape of the curvature-type reflective surface of each of the plurality of curvature-type reflectors 210 is not limited thereto, and at least a part of the shape of the curvature-type reflective surface of each of the plurality of curvature-type reflectors 210 may be implemented in a different shape on the assumption that the above-described predetermined equation is satisfied. For example, the shape of the curved reflective surface of each of the plurality of curvature reflectors 210 is divided into a plurality of shape groups such as a first group having a first shape and a second group having a second shape. It can be provided.

For example, according to the position on the functional optical waveguide of the curvature type reflector considering the degree of proximity to the edge at which light is collected, the output angle 10 reflected from the curvature type reflector may be set differently to an optimal value for each curvature type reflector. Accordingly, at least a part of the shape (eg, curvature or direction) of the curvature type reflector may have a different shape for each curvature type reflector.

As another example, the focal length or width of the upwardly convex lens 110 of the condensing lens layer 100, the separation distance between the upwardly convex lenses, etc., is a window-type photovoltaic device (1) using a functional optical waveguide according to an embodiment of the present application. ), and the shape of the curvature-type reflective surface may have a different shape for each curvature-type reflector in consideration of the specifications of each of the upwardly convex lenses 110.

In other words, the curvature and direction of each curvature type reflector consider at least one of the focal length ( F ) of the upwardly convex lens 110, the width of the upwardly convex lens 110, and a position in the functional optical waveguide of each curvature type reflector. In the range that satisfies the equation presented in the present invention, a plurality of curved reflectors having different shapes may be used because they may be set differently as necessary.

In the window-type photovoltaic device 1 using a functional optical waveguide according to an embodiment of the present application, a surface opposite to the condensing direction (9 o'clock in FIG. 1) of the curvature-type reflective surface 211 is as shown in FIG. As such, it may be formed as a vertical surface, but this should be understood as an exemplary implementation example, and may be implemented in various forms within a range that does not impair the satisfaction of the above-described predetermined conditions.

The curvature type reflector 210 may include a first curvature type reflector 230 and a second curvature type reflector 240.

The curvature-type reflective surface of the first curvature-type reflector 230 collects light collected by the condensing lens layer 100 to one edge 250 of the optical waveguide condensing layer 200, based on the vertical direction of the other side. The height may be higher than the vertical reference height of one side.

The curvature-type reflective surface of the second curvature-type reflector 240 collects the light collected by the condensing lens layer 100 to the other edge 260 of the optical waveguide condensing layer 200, based on the vertical direction of one side. The height may be higher than the vertical reference height of the other side.

The solar cell array 300 may be disposed to face the edge of the optical waveguide condensing layer 200.

The solar cell array 300 may convert light that is totally reflected by the light waveguide condensing layer 200 and collected toward the edge into electric power. In other words, the total reflected light is directed toward the solar cell array 300 and may be converted into electrical energy.

8 is a schematic cross-sectional view illustrating an embodiment of a first curvature type reflector and a second curvature type reflector.

Referring to FIG. 8, the window-type solar power generation device 1 using a functional optical waveguide according to an embodiment of the present application is in one direction with respect to the center 220 in the width direction of the optical waveguide condensing layer 200. A plurality of first curvature type reflectors 230 may be provided, and a plurality of second curvature type reflectors 240 may be provided in the other direction.

In this case, the amount of light collected by one edge 250 of the optical waveguide condensing layer 200 and the amount of light collected by the other edge 260 may be the same.

The window-type solar power generation device 1 using a functional optical waveguide according to an embodiment of the present application includes an amount of light collected by one edge 250 of the optical waveguide condensing layer 200 and an amount of light collected by the other edge 260 To be different, the number of the plurality of first curvature type reflectors 230 and the plurality of second curvature type reflectors 240 based on the center 220 in the width direction of the light waveguide layer 200 are provided differently It can be designed to be.

At this time, the widthwise spacing of each of the plurality of first curvature-type reflectors 230 based on the widthwise center 220 and the widthwise spacing of each of the plurality of second curvature-type reflectors 240 may be set differently. I can.

The window-type solar power generation device 1 using a functional optical waveguide according to an embodiment of the present application includes an amount of light collected by one edge 250 of the optical waveguide condensing layer 200 and an amount of light collected by the other edge 260 To be different, a plurality of first curvature-type reflectors 230 are provided in one direction based on a point spaced apart from the center 220 in the width direction of the light waveguide layer 200 in one direction or in the other direction by a predetermined distance. It may be designed to have a plurality of second curvature type reflectors 240 in the other direction.

In the window-type solar power generation device 1 using a functional optical waveguide according to an embodiment of the present application, a light conversion material is coated on the curved reflective surface 211 or the light is converted on the edge side of the optical waveguide condensing layer 200 As the material is designed in a coating manner, the light energy absorbed by the solar cell array 300 can be amplified.

A window-type solar power generation device 1 using a functional optical waveguide according to an embodiment of the present application is a coating layer capable of reducing reflectance on the upper and lower surfaces of the plurality of upwardly convex lenses 110 of the condensing lens layer 100 It can be designed in a provided form.

On the other hand, the present application can provide a solar cell window (2) including a window-type solar power generation device (1) using a functional optical waveguide. However, in the description of the solar cell window 2 according to the embodiment of the present application, a description will be given of a part overlapping with the part described in the window type solar power generation device 1 using a functional optical waveguide according to the embodiment of the present application. It will be simplified or omitted.

9 is a schematic three-dimensional view of a solar cell window including a window-type solar power generation device using a functional optical waveguide according to an embodiment of the present application.

Referring to FIG. 9, a solar cell window 2 according to an embodiment of the present application includes a condensing lens layer 100, a light waveguide condensing layer 200, a solar cell array 300, and an edge frame 400. can do. For reference, since the condensing lens layer 100, the optical waveguide condensing layer 200, and the solar cell array 300 are configured to correspond to the window-type solar power generation device 1 using the above-described functional optical waveguide, The solar cell window 2 according to the embodiment may be referred to as a device including the window type solar power generation device 1 using a functional optical waveguide according to an embodiment of the present application.

The condensing lens layer 100 of the solar cell window 2 according to the exemplary embodiment of the present disclosure may be provided in the form of a 2D array in which spherical condensing lenses are repeatedly arranged as shown in FIG. 9.

Although not shown in the drawing, the condensing lens layer 100 of the solar cell window 2 according to another embodiment of the present application may be provided in the form of a 1D Cylindrical array having a cylindrical shape in the longitudinal direction.

The edge frame 400 may be provided to surround the edge so that the outflow of the collected light toward the edges 250 and 260 of the light waveguide layer 200 is blocked, and the solar cell array 300 may be disposed in an inner region. have.

The edge frame 400 may be disposed about at least a portion of the perimeter of the solar cell window 2 using the functional optical waveguide according to an exemplary embodiment of the present disclosure.

For example, the solar cell array 300 may be mounted inside the edge frame 400 and disposed to face the circumference (edge) of the optical waveguide condensing layer 200.

As another example, the solar cell array 300 may be installed on at least a portion of the condensing lens layer 100 and the edge frame 400 facing the circumferential surface of the optical waveguide condensing layer 200.

In addition, the edge frame 400 may be provided in the form of a window frame. However, the arrangement of the edge frame 400 is not limited to the above-described example, and may be variously arranged as necessary.

10A is a schematic cross-sectional view showing a path of light collected by a window-type solar power generation device having a conventional planar reflector, and FIG. 10B is a window-type solar power generation using a functional optical waveguide according to an embodiment of the present application. It is a schematic cross-sectional view showing a path of light condensed by the device.

10A and 10B, in the case of a conventional window-type solar power generation device having a planar reflector, light is scattered in various directions in the optical waveguide, so that light cannot be controlled, or scattered light is reflected back to an adjacent reflector. In contrast, it is possible to check the appearance of light leaking out of the optical waveguide out of the total reflection condition when it causes interference or when it reaches the optical waveguide interface, while a window using a functional optical waveguide having a curvature type reflector according to an embodiment of the present application In the case of the type photovoltaic device 1, it can be confirmed that the light collected by the lens is constantly reflected in the same angle and direction.

FIG. 11A is a schematic cross-sectional view showing a path of light reflected from one point of a conventional planar reflector, and FIG. 11B is a curvature type in a window type solar power generation device using a functional optical waveguide according to an embodiment of the present application. It is a schematic cross-sectional view showing a path of light reflected by the reflector.

Referring to FIGS. 11A and 11B, even if only sunlight incident in a certain range is considered, light scattering and interference with adjacent reflectors are less than when a conventional planar reflector is used. It can be seen that the effect of decreasing the amount of light collected toward the edge is improved.

12 is an experimental example in connection with a window-type solar power generation device using a functional optical waveguide according to an embodiment of the present application, and a conventional window-type solar power generation device using a functional optical waveguide according to an embodiment of the present application This is a graph comparing the transmittance, reflectance, and edge collection rate according to the position of the reflector in the optical waveguide of a window-type solar power generation device having a planar reflector.

Referring to FIG. 12, when using a window-type solar power generation device using a functional optical waveguide having a curvature-type reflector according to an embodiment of the present application, the conventional window-type solar power generation device having a flat-type reflector. It can be seen that the transmittance (T) and the edge collection rate (ECR) increase, and the reflectance (R) decreases, thereby dramatically improving the performance of various aspects.

The foregoing description of the present application is for illustrative purposes only, and those of ordinary skill in the art to which the present application pertains will be able to understand that it is possible to easily transform it into other specific forms without changing the technical spirit or essential features of the present application. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form.

The scope of the present application is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present application.

1: Window type solar power generation device using functional optical waveguide
100: condensing lens layer
110: upward convex lens
111: focus
200: optical waveguide light collecting layer
210: curved reflector
211: curved reflective surface
230: first curvature type reflector
240: second curvature type reflector
250: one edge
260: the other edge
300: solar cell array
2: solar cell windows
400: edge frame
500: sunlight
10: output angle
20: first angle
30: second angle

Claims (16)

In the window type solar power generation device,
A condensing lens layer condensing sunlight incident from the upper side to the lower side;
A plurality of curvature types that are spaced apart from the condensing lens layer and provided to collect at least a part of the light that has passed through the condensing lens layer and entered from the upper side through a curvature-type reflective surface and collects it toward the edge through the optical waveguide therein. An optical waveguide condensing layer including a reflector; And
Including a solar cell array disposed opposite to the edge of the light wave collecting layer,
The condensing lens layer includes a plurality of upwardly convex lenses,
One of the plurality of curvature-type reflectors is provided so as to be positioned to correspond to one of the plurality of upwardly convex lenses in the vertical direction,
The focus of the plurality of upwardly convex lenses is located below the curvature-type reflective surface, a window-type solar power generation device using a functional optical waveguide. The method of claim 1,
The curved reflective surface is formed with a predetermined curvature so that the reflected light proceeds while satisfying a total reflection condition in the optical waveguide condensing layer. delete delete The method of claim 1,
The curvature-type reflective surface is formed to reflect at least some of the light passing through the corresponding upward convex lens and reaching the focal point at an angle that satisfies the total reflection condition, a window-type solar system using a functional optical waveguide Photovoltaic device. The method of claim 5,
When the light condensed by the condensing lens layer is to be collected by one edge positioned at one side in the width direction of the optical waveguide condensing layer,
The upwardly convex protruding shape of the curvature type reflective surface is a total reflection condition in which a reflection angle is set so that the light reflected from the curvature type reflective surface can proceed in total reflection within the optical waveguide based on a polar coordinate system with the focal point as an origin, and In consideration of an angular range condition that covers at least some of the light incident through the condensing lens layer, it is formed to be reflected at a reflection angle that satisfies the total reflection condition within an angular range that satisfies the angular range condition, Window-type solar power generation device using functional optical waveguides. The method of claim 6,
The upwardly convex protruding shape of the curved reflective surface is formed in consideration of a non-interference condition that prevents the reflected light from interfering with a neighboring curved reflector adjacent to one side in the width direction, a window type using a functional optical waveguide Solar power device. The method according to claim 6 or 7,
The angle component of each point of the upwardly convex protruding shape has a range that satisfies the following equation 1,
The radius component of each point of the upwardly convex protrusion corresponding to the angular component is determined based on a distance function from the origin that satisfies Equation 2 below,
[Equation 1]

[Equation 2]

Here, θ _ini is a first angle that is a minimum value among angular components of each point of the upwardly convex protrusion shape, θ _fin is a second angle that is a maximum value among angular components of each point of the upwardly convex protrusion shape, and r(θ) is the origin. The distance function from, θ ₀ is the output angle, which is the angle that satisfies the total reflection condition,
The first angle and the second angle are counterclockwise based on a direction toward the other edge located at the other side in the width direction of the optical waveguide condensing layer on the width direction axis of the polar coordinate system with the focal point as the origin. Is measured,
The output angle is measured based on a clockwise direction with a direction toward one edge located at one side of the width direction of the optical waveguide on one side of the width direction of the polar coordinate system with the focal point as the origin. Window type photovoltaic power generation device using waveguide. The method of claim 8,
The angular range condition is,
The first angle and the second angle are conditions to be determined in the range satisfying the following Equations 3 to 5,
[Equation 3]

[Equation 4]

[Equation 5]

Here, d _l is the width of the upwardly convex lens based on the width direction, F is the focal length of the upwardly convex lens, θ _l is the maximum incident angle of light incident through the upwardly convex lens, and θ _ini is the first Angle, θ _fin is the second angle, the window type solar power generation device using a functional optical waveguide. The method of claim 8,
The non-interference condition is,
It is a condition that the neighboring curvature type reflector is spaced apart from the curvature type reflector so as to satisfy Equation 6 below based on the width direction,
[Equation 6]

Here, θ ₀ is the output angle, H is the vertical reference protrusion height of the neighboring curvature type reflector, L is the distance to be spaced apart from the window type solar power generation device using a functional optical waveguide. The method of claim 8,
The total reflection condition is,
The output angle is a condition to be determined in the range that satisfies the following equations 7 to 9,
[Equation 7]

[Equation 8]

[Equation 9]

Here, n ₁ is the refractive index of the medium between the condensing lens layer and the optical waveguide condensing layer, n ₂ is the refractive index of the medium forming the optical waveguide condensing layer, θ _c is the critical angle of total reflection in the optical waveguide condensing layer, θ ₀ is the output angle, the window type solar power generation device using a functional optical waveguide. The method of claim 5,
The curvature type reflector includes a first curvature type reflector and a second curvature type reflector,
The curvature-type reflective surface of the first curvature-type reflector has a vertical reference height of the other side higher than a vertical reference height of one side so as to collect light collected by the condensing lens layer to one edge of the optical waveguide condensing layer. Will,
The curvature-type reflective surface of the second curvature-type reflector has a vertical reference height of one side higher than the vertical reference height of the other side so as to collect light collected by the condensing lens layer to the other edge of the optical waveguide condensing layer. That is, a window-type solar power generation device using a functional optical waveguide. The method of claim 12,
A functional optical waveguide in which a plurality of the first curvature-type reflectors are provided in one direction and a plurality of second curvature-type reflectors are provided in the other direction based on the center of the width direction of the optical waveguide light collecting layer. Window type solar power generation device using. The method of claim 13,
The number of the plurality of first curvature-type reflectors and the number of the plurality of second curvature-type reflectors are provided so that the amount of light collected by one edge of the light waveguide layer and the amount of light collected by the other edge are different from each other. , Window type solar power generation device using functional optical waveguide. The method of claim 12,
One direction based on a point spaced apart in one direction or the other direction by a predetermined distance from the center of the width direction of the optical waveguide condensing layer so that the amount of light collected by one edge of the optical waveguide light collecting layer and the amount of light collected by the other edge are different. A plurality of the first curvature type reflector is provided, and a plurality of the second curvature type reflectors are provided in the other direction, a window type solar power generation device using a functional optical waveguide. Window-type solar power generation device using the functional optical waveguide according to claim 1; And
A solar cell window comprising an edge frame that surrounds the edge so as to block outflow of light collected toward the edge of the optical waveguide light collecting layer, and in which the solar cell array is disposed in an inner region.

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