Power generation system

Abstract

To provide a power generation system capable of suppressing a decrease in power generation efficiency and damage by external factors.SOLUTION: A power generating system 10 comprises a solar power generation sheet 12 which is arranged on an indoor ceiling surface 104, and a reflector 14 which reflects outdoor sunlight L1 onto the solar power generation sheet 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power generation system. [Background technology]

[0002] The following Patent Document 1 discloses a roller shade device that includes a screen section that is placed in a building at a predetermined distance from an exterior window and a holder that holds the screen section so that it can be rolled up. The screen section includes a first screen section that is provided with a solar cell unit and a second screen section that is provided to cover the first screen section.

[0003] Patent Document 2 below discloses a photovoltaic / light shelf attached to the outside of an opening in the exterior wall of a building. The photovoltaic / light shelf has multiple solar cell panels, each with a light-receiving surface that reflects a portion of the incident sunlight, arranged approximately horizontally and spaced apart vertically along the opening. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-177746 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-213255 Summary of the Invention [Problem to be solved by the invention]

[0005] In the roller shade device described in Patent Document 1, the first screen unit and the second screen unit are provided at positions spaced apart from the exterior windows inside the building. This makes it difficult for sunlight to directly irradiate the solar cell unit of the first screen unit, making it difficult for the solar cell unit to generate electricity efficiently.

[0006] In Patent Document 2, solar panels are arranged horizontally outside the opening in the exterior wall of a building, which makes it easier for sunlight to directly irradiate the solar panels. However, because the solar panels are arranged outdoors, there is a risk that they may become dirty, resulting in a decrease in power generation efficiency, or that the solar panels may be damaged by external factors such as rain or hail.

[0007] In consideration of the above, an object of the present invention is to provide a power generation system that can suppress a decrease in power generation efficiency and damage due to external factors. [Means for solving the problem]

[0008] The power generation system according to a first aspect includes a photovoltaic power generation element disposed on an indoor ceiling surface, and a reflector that reflects outdoor sunlight onto the photovoltaic power generation element.

[0009] According to the power generation system described in the first aspect, by arranging the solar power generation material on the ceiling surface indoors and using a reflector to reflect sunlight onto the solar power generation material, it is possible to construct a power generation system that is more durable against external factors such as reduced power generation efficiency due to dirt and damage to the device due to rain or hail, compared to a system installed outdoors.

[0010] The power generation system according to the second aspect is the power generation system according to the first aspect, wherein the photovoltaic material is a photovoltaic sheet attached to the ceiling surface, and the reflector is arranged to protrude from the outside of the window.

[0011] According to the power generation system of the second aspect, the photovoltaic material is a photovoltaic sheet, which can be easily installed on a ceiling. For example, compared to crystalline silicon solar cells, perovskite photovoltaic sheets are lighter and easier to install on indoor ceilings. Furthermore, since the reflector is provided in a state where it protrudes from the outside of the window, the reflector can efficiently reflect sunlight onto the photovoltaic sheet.

[0012] The power generation system according to a third aspect is the power generation system according to the second aspect, wherein the reflector is a metal plywood formed by attaching a metal plate with a high linear expansion coefficient to the top surface of a metal plate with a low linear expansion coefficient, with the top surface facing the ceiling surface.

[0013] In the power generation system described in the third aspect, the metal plywood reflector has a concave shape in winter, concentrating sunlight and directing it to the photovoltaic sheet for efficient power generation. In summer, the metal plywood has a flat or convex shape, preventing excessive light concentration and reducing the efficiency of power generation by the photovoltaic sheet and preventing the temperature from rising indoors.

[0014] A fourth aspect of the power generation system is the power generation system according to the second aspect, wherein the reflecting plate is provided so that the angle of inclination relative to a horizontal plane is adjustable.

[0015] In the power generation system according to the fourth aspect, the reflector is provided with an adjustable tilt angle relative to the horizontal plane, so that in winter, for example, the tilt angle of the reflector relative to the horizontal plane can be made smaller than in summer, thereby efficiently reflecting sunlight onto the photovoltaic sheet. [Effects of the Invention]

[0016] According to the power generation system of the present disclosure, it is possible to suppress a decrease in power generation efficiency and damage due to external factors. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic configuration diagram showing a power generation system of a first embodiment. [Figure 2] FIG. 2A is an enlarged view showing a part of the power generation system of the first embodiment in winter, and FIG. 2B is an enlarged view showing a part of the power generation system in summer. [Figure 3] FIG. 6 is an enlarged configuration diagram showing a part of a power generation system according to a second embodiment. [Figure 4]FIG. 10 is an enlarged configuration diagram showing a part of a power generation system according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the accompanying drawings, in which elements less relevant to the present invention are omitted.

[0019] [First embodiment] A power generation system according to a first embodiment will be described with reference to Figures 1 and 2. Figure 1 shows the overall configuration of a power generation system 10 according to the first embodiment.

[0020] <Overall configuration of power generation system> As shown in Figure 1, the power generation system 10 includes a solar power generation sheet 12 arranged on a ceiling surface 104 inside the building 100, and a reflector 14 that reflects sunlight L1 outside the building 100 onto the solar power generation sheet 12.

[0021] (Photovoltaic power generation sheet) 1, the photovoltaic sheet 12 is an example of a photovoltaic material and is a thin sheet-like member. The photovoltaic sheet 12 is attached to a ceiling surface 104 inside a room 102 using a jig or the like.

[0022] The photovoltaic sheet 12 is composed of, for example, a perovskite solar cell (perovskite PV: Photovoltaic). A perovskite solar cell uses a compound having a perovskite crystal structure (general formula: AMX3) as a power generation layer. A is a monovalent cation. Examples of A include monovalent cations such as alkali metal cations or organic cations. M is a divalent cation. M is, for example, a divalent cation of a transition metal or an element of Groups 13 to 15. More specifically, examples of M include Pb 2+ , Ge 2+ , Sn 2+X is a monovalent anion such as a halogen anion. Each site of A, M, and X may be occupied by multiple types of ions. Perovskite solar cells can be manufactured by coating or printing the material onto a film. While crystalline silicon solar cells are heavy and thick, perovskite solar cells are made up of a membrane of small crystals, making them resistant to bending and distortion and allowing for lightweight construction.

[0023] In the first embodiment, the photovoltaic sheet 12 is lightweight, which makes it easier to attach the photovoltaic sheet 12 to the ceiling surface 104. Although not shown in the figures, the photovoltaic sheet 12 is electrically connected to a power supply circuit via wiring.

[0024] (reflector) As shown in FIG. 1 , the reflector 14 is provided in a state where it protrudes from the outside of a window 108 provided in an opening in an exterior wall 106 of a building 100. The window 108 is an example of a window. A plurality of reflectors 14 (for example, three) are provided at intervals in the vertical direction of the window 108. The reflector 14 is attached to a vertical frame 108A that constitutes the window 108 by means of supports 20. For example, both ends of the reflector 14 in the width direction are attached to a pair of frame bodies 108A by means of the supports 20.

[0025] The reflectors 14 are attached to the frame 108A of the window section 108 by the supports 20 in a nearly horizontal position, and are inclined relative to the supports 20 so that the tip of the reflectors 14 is positioned higher than the supports 20. In the power generation system 10, outdoor solar radiation L1 is reflected by the multiple reflectors 14, and the reflected light L2 passes through the window section 108 of the building 100 and is irradiated onto the solar power generation sheet 12 on the ceiling surface 104 of the indoor space 102. The inclination angle of the multiple reflectors 14 relative to the horizontal plane and the position of the solar power generation sheet 12 on the ceiling surface 104 are adjusted so that the light L2 reflected by the reflectors 14 is irradiated onto the solar power generation sheet 12 on the ceiling surface 104.

[0026] The reflectors 14 are nearly horizontal, so as not to obstruct the line of sight of a person P inside the building 102. As an example, the reflectors 14 are spaced at different intervals in the vertical direction of the window sections 108, so as not to spoil the view (i.e., not to obstruct the line of sight) when a person P is standing on the floor 110 of the interior 102 of the building 100 and looks outside through the window sections 108. Specifically, the reflectors 14 are arranged so that when the person P is standing on the floor 110, the distance between the upper and lower reflectors 14 at a position facing the line of sight of the person P is greater than the distance between the upper and lower reflectors 14 at a position above the line of sight of the person P.

[0027] 2(A) and 2(B), the reflector 14 is a metal plywood 32 formed by attaching a metal plate 32A having a high linear expansion coefficient to the upper surface of a metal plate 32B having a low linear expansion coefficient, with the upper surface of the metal plate 32B facing the ceiling surface 104. That is, the reflector 14 includes the metal plate 32A disposed on the upper side in the vertical direction and the metal plate 32B disposed on the lower side in the vertical direction. The reflector 14 is attached to the frame 108A of the window portion 108 by the support part 20 with the metal plate 32A attached to the upper surface of the metal plate 32B facing the ceiling surface 104. The thermal expansion coefficient is a material property specific to a substance and indicates how much a dimension expands when the temperature rises by 1°C.

[0028] The metal plate 32A is made of, for example, an aluminum alloy having a large linear expansion coefficient. -5 (1 / °C). The metal plate 32B is made of, for example, steel, which has a smaller coefficient of linear expansion than aluminum alloys. Steel is a type of alloy made primarily of iron, with 0.02% to 2.14% carbon and trace amounts of manganese and phosphorus added. For example, the coefficient of linear expansion of steel is 1.17×10 -5 (1 / ℃).

[0029] 2(A), in winter (i.e., during the winter months) when temperatures are relatively low, the upper metal plate 32A is more likely to shrink than the lower metal plate 32B, resulting in a concave shape for the reflector 14. When the reflector 14 is concave, outdoor sunlight L1 is reflected by the reflector 14 and concentrated, and the reflected light L2 is more likely to be irradiated onto a narrow area including the solar power generation sheet 12.

[0030] As shown in FIG. 2(B), during the summer months (i.e., summer months) when temperatures are relatively high, the reflector 14 is less curved than in winter due to the difference in the thermal expansion coefficients of the upper and lower metal plates 32A and 32B. For example, the reflector 14 may be substantially flat. In some cases, the reflector 14 may be convex. This reduces the concentration of solar light L1 when it is reflected by the reflector 14, and the reflected light L2 is irradiated over a wide area, including the photovoltaic sheet 12 on the ceiling surface 104. In the first embodiment, the tilt angle of the reflector 14 relative to the horizontal plane and the position of the photovoltaic sheet 12 on the ceiling surface 104 are adjusted so that as much of the reflected light L2 as possible is irradiated onto the photovoltaic sheet 12, without reducing the power generation efficiency of the photovoltaic sheet 12 due to excessive concentration of the reflected light L2 by the reflector 14.

[0031] <Action and effect> Next, the operation and effects of the first embodiment will be described.

[0032] The power generation system 10 includes a photovoltaic sheet 12 disposed on a ceiling surface 104 inside a building 100, and a reflector 14 that reflects sunlight L1 outside the building 100 onto the photovoltaic sheet 12.

[0033] In the power generation system 10, a photovoltaic sheet 12 is disposed on a ceiling surface 104 inside the building 100, and a reflector 14 reflects sunlight L1 onto the photovoltaic sheet 12. This makes it possible to construct a power generation system 10 that is more resistant to external factors, such as reduced power generation efficiency due to dirt and damage to the device due to rain or hail, than when the photovoltaic material is installed outdoors. Furthermore, compared to when the photovoltaic material is installed outdoors, this eliminates the need for large-scale work such as setting up scaffolding outside the building 100, making maintenance and replacement of the photovoltaic sheet 12 easier.

[0034] In the power generation system 10, the photovoltaic sheet 12 is attached to a ceiling surface 104 inside the building 100, and the reflector 14 is provided so as to protrude from the outside of a window 108 of the building 100.

[0035] The power generation system 10 can be easily installed on the ceiling surface 104 by using the photovoltaic sheet 12. As an example, a perovskite solar cell is used as the photovoltaic sheet 12. Compared to crystalline silicon photovoltaic cells, the perovskite photovoltaic sheet 12 is lighter in weight and easier to install on the ceiling surface 104 of the indoor space 102.

[0036] Furthermore, since the reflector 14 is provided in a state where it protrudes from the outside of the window 108 of the building 100, the reflector 14 can efficiently reflect the sunlight L1 to the photovoltaic sheet 12.

[0037] The reflector 14 is a metal plywood 32 formed by attaching a metal plate 32A having a large linear expansion coefficient to the upper surface of a metal plate 32B having a small linear expansion coefficient, with the upper surface of the metal plate 32B facing the ceiling surface 104.

[0038] In the power generation system 10, as shown in Figure 2(A), in winter the metal plywood 32 reflects light in a concave shape, concentrating sunlight (i.e., solar radiation L1) and directing it toward the photovoltaic sheet 12, thereby generating electricity efficiently. As shown in Figure 2(B), in summer the metal plywood 32 becomes flat or convex, preventing a decrease in power generation efficiency due to excessive light concentration by the photovoltaic sheet 12 and a rise in indoor temperature.

[0039] Second Embodiment Next, a power generation system according to a second embodiment will be described. Note that the same components as those in the first embodiment will be given the same reference numerals and the description thereof will be omitted.

[0040] Fig. 3 shows an enlarged configuration diagram of a portion of a power generation system 50 according to the second embodiment. As shown in Fig. 3, the power generation system 50 includes a solar power generation sheet 12 and a reflector 52 that reflects sunlight L1 outside the building 100 onto the solar power generation sheet 12. The reflector 52 is attached to a frame 108A of a window 108 by a support 20. The reflector 52 is provided so that its angle of inclination with respect to the horizontal plane can be adjusted by an adjustment plate 56 disposed on the side of the support 20.

[0041] Specifically, reflector 52 is a metal plywood 54 formed by attaching metal plate 54A having a large linear expansion coefficient to the upper surface of metal plate 54B having a small linear expansion coefficient, with the upper surface of metal plate 54B facing ceiling surface 104. That is, metal plywood 54 has metal plate 54A disposed on the upper side in the vertical direction and metal plate 54B disposed on the lower side in the vertical direction.

[0042] In the second embodiment, the length of metal plate 54B along its protruding direction is shorter than the length of metal plate 54A along its protruding direction, and metal plate 54B does not extend to support portion 20. An adjustment plate 56 is attached to the lower portion of metal plate 54B on the support portion 20 side, and extends to a position where metal plate 54B is not located and is supported by support portion 20. The length of adjustment plate 56 along its protruding direction is preferably between 1 / 5 and 1 / 3 of the length of reflector 52 along its protruding direction. As an example, the length of adjustment plate 56 along its protruding direction is approximately 1 / 4 of the length of reflector 52 along its protruding direction.

[0043] The adjusting plate 56 is made of a metal having a higher linear expansion coefficient than the metal plate 54B. The metal plate 32A is made of, for example, an aluminum alloy having a higher linear expansion coefficient, and the metal plate 32B is made of, for example, steel having a lower linear expansion coefficient than the aluminum alloy. As an example, the adjusting plate 56 is made of the same material (e.g., aluminum alloy) as the metal plate 32A.

[0044] In winter, the solar altitude is lower than in summer, so it is preferable to use the adjustment plate 56 to adjust the reflector 52 in winter so that it is more tilted than the reflector 52 in summer. In the second embodiment, the linear expansion coefficient of the adjustment plate 56 is greater than the linear expansion coefficient of the metal plate 32B, so that the reflector 52 in winter can be adjusted so that it is more tilted than the reflector 52 in summer. In other words, the adjustment plate 56 is less likely to stretch in winter than in summer, so the inclination angle of the reflector 52 with respect to the horizontal plane in winter is smaller than the inclination angle of the reflector 52 with respect to the horizontal plane in summer. Other configurations of the power generation system 50 are similar to those of the power generation system 10 of the first embodiment.

[0045] The power generation system 50 can obtain the following actions and effects in addition to the actions and effects obtained by the same configuration as the power generation system 10 of the first embodiment.

[0046] In the power generation system 50, the reflector 52 is provided so that the angle of inclination relative to the horizontal plane can be adjusted by the adjustment plate 56. Therefore, by making the angle of inclination of the reflector 52 relative to the horizontal plane smaller in winter than in summer, it is possible to efficiently reflect the solar radiation L1 onto the photovoltaic sheet 12.

[0047] Third Embodiment Next, a power generation system according to a third embodiment will be described. Note that the same components as those in the first and second embodiments will be given the same reference numerals and descriptions thereof will be omitted.

[0048] Fig. 4 shows an enlarged view of a portion of a power generation system 70 according to the third embodiment. As shown in Fig. 4, the power generation system 70 includes a solar power generation sheet 12 and a reflector 14. The reflector 14 is provided so that its angle of inclination relative to the horizontal plane can be adjusted by an adjustment lever 74.

[0049] Specifically, the reflector 14 is attached to a frame 108A of the window section 108 by a support 72. A rotation shaft 76 that rotates the reflector 14 up and down is provided on the support 72, and an adjustment lever 74 that extends toward the indoor 102 side of the building 100 is attached to the rotation shaft 76. By moving the adjustment lever 74 up and down, the rotation shaft 76 can be rotated to move the reflector 14 up and down. For example, by manually moving the adjustment lever 74 downward in the up and down direction by the user, the angle of inclination of the reflector 14 with respect to the horizontal plane increases, and by moving the adjustment lever 74 upward in the up and down direction, the angle of inclination of the reflector 14 with respect to the horizontal plane decreases.

[0050] In winter, the solar altitude is lower than in summer, so it is preferable to use the adjustment lever 74 to adjust the reflector 14 in winter so that it is tilted more inclined than the reflector 14 in summer. For example, in winter, the user manually moves the adjustment lever 74 upward in the vertical direction, thereby decreasing the inclination angle of the reflector 14 with respect to the horizontal plane. For example, in summer, the user manually moves the adjustment lever 74 downward in the vertical direction, thereby increasing the inclination angle of the reflector 14 with respect to the horizontal plane. The other configurations of the power generation system 70 are the same as those of the power generation system 10 of the first embodiment.

[0051] The power generation system 70 can obtain the following actions and effects in addition to the actions and effects obtained by the same configuration as the power generation system 10 of the first embodiment.

[0052] In the power generation system 70, the reflector 14 is provided so that the angle of inclination with respect to the horizontal plane can be adjusted using an adjustment lever 74. Therefore, by making the angle of inclination of the reflector 14 with respect to the horizontal plane smaller in winter than in summer, it is possible to efficiently reflect the solar radiation L1 onto the photovoltaic sheet 12.

[0053] 〔others〕 In the first to third embodiments, the photovoltaic sheet 12 is not limited to the configuration disclosed herein and can be modified to other configurations without departing from the scope of the present invention. Furthermore, the reflectors 14, 52 are also not limited to the configuration disclosed herein and can be modified to other configurations without departing from the scope of the present invention. Furthermore, the number and positions of the reflectors 14, 52 in the window portions 108 of the building 100 can also be modified.

[0054] Although the present invention has been described in detail with reference to specific embodiments, it will be apparent to those skilled in the art that the present invention is not limited to such embodiments, and that various other embodiments are possible within the scope of the present invention. [Explanation of symbols]

[0055] 10 Power Generation System 12 Photovoltaic sheet 14 Reflector 32 Metal Plywood 32A metal plate 32B metal plate 50 Power Generation System 52 Reflector 54 Metal Plywood 54A metal plate 54B Metal plate 56 Adjustment plate 70 Power Generation System 72 Support part 74 Adjustment lever 76 Rotation axis 100 buildings 102 Indoor 104 Ceiling surface 108 Window section (window) L1 solar radiation L2 reflected light

Claims

1. A solar power generation material arranged on an indoor ceiling surface, a reflector that reflects outdoor sunlight to the photovoltaic material; A power generation system equipped with:

2. the photovoltaic material is a photovoltaic sheet attached to the ceiling surface, The power generation system according to claim 1 , wherein the reflector is provided in a state of protruding from the outside of the window.

3. The power generation system according to claim 2, wherein the reflector is a metal plywood formed by attaching a metal plate with a high linear expansion coefficient to the top surface of a metal plate with a low linear expansion coefficient, with the top surface facing the ceiling surface.

4. The power generation system according to claim 2 , wherein the reflector is provided so that an angle of inclination of the reflector relative to a horizontal plane can be adjusted.

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