Indoor solar power generation building and photoelectric converter

Abstract

To provide an indoor solar power generation building capable of efficiently utilizing sunlight received inside the building to perform more efficient solar power generation, and a photoelectric converter suitable for use in the indoor solar power generation building. [Solution] A building having a floor 10, walls 20, and a ceiling 30, and a power generation space GS for installing a photoelectric converter 50 inside that receives sunlight SL and converts it into electricity, at least the ceiling 30 in the power generation space GS is provided with a sunlight-transmitting section 40 that allows sunlight SL to enter the interior, and at least a portion of the floor 10 and walls 20 in the power generation space GS is provided with a reflector 41 that reflects sunlight SL that is received inside from the sunlight-transmitting section 40.

Description

[Technical Field]

[0001] The present invention relates to an indoor solar power generation building and a photoelectric converter suitable for use in the indoor solar power generation building. [Background technology]

[0002] Conventionally, as seen in, for example, Patent Documents 1 to 4, BACKGROUND ART There are known buildings in which photoelectric converters that receive sunlight and convert it into electricity are installed. Such a building allows solar power generation within the building.

[0003] However, these conventional technologies do not include the technical idea of ​​efficiently utilizing the sunlight received within a building to generate more efficient solar power. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-238785 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-146967 [Patent Document 3] No. No. 3161980 [Patent Document 4] Japanese Patent Publication No. 2020-130075 Summary of the Invention [Problem to be solved by the invention]

[0005] The problem to be solved by the present invention is to provide an indoor solar power generation building that can efficiently utilize sunlight received inside the building to perform more efficient solar power generation, and a photoelectric converter suitable for use in this indoor solar power generation building. [Means for solving the problem]

[0006] In order to solve the above problems, the indoor solar power generation building of the present invention comprises: A building having a floor, walls, and a ceiling, and having a power generation space for installing a photoelectric converter therein that receives sunlight and converts it into electricity, a sunlight-transmitting portion that allows sunlight to enter the interior of the power generation space is provided on at least the ceiling portion of the power generation space; The power generation space is characterized in that a reflector that reflects sunlight that has entered the interior through the sunlight transmitting portion is provided on at least a portion of the floor and wall of the power generation space.

[0007] With the above-mentioned configuration, the indoor solar power generation building can provide the following effects. Solar power generation can be performed indoors by irradiating the photoelectric converter installed in the power generation space with sunlight that has entered the room through a sunlight transmitting section provided at least in the ceiling section. Furthermore, at least a portion of the floor and wall sections of the power generation space are provided with reflectors that reflect sunlight that enters the interior through the sunlight-transmitting section, so that the sunlight reflected by these reflectors can also be directed at the photoelectric converter to generate electricity. Therefore, this indoor solar power generation building makes it possible to efficiently utilize the sunlight received inside the building and generate solar power more efficiently.

[0008] In this indoor solar power generation building, The building may be a two-story or higher building, and the power generation space may be provided on the top floor of the building.

[0009] When configured like this, By locating the power generation space on the top floor, which is expected to receive the most sunlight, it is expected that more efficient solar power generation will be possible, and the floors below the top floor will be able to be used for purposes other than solar power generation.

[0010] In this indoor solar power generation building, The photoelectric conversion element is a direct light receiving section that can directly receive sunlight that is received indoors mainly through the sunlight transmitting section; a reflected light receiving portion capable of receiving mainly reflected light reflected by the reflector; The configuration may include the following.

[0011] When configured like this, In addition to the fact that sunlight received indoors from the sunlight-transmitting section is mainly received directly by the direct light-receiving section, sunlight received indoors from the sunlight-transmitting section and reflected by the reflector is mainly received by the reflected light-receiving section that can receive reflected light reflected by the reflector, resulting in more efficient solar power generation.

[0012] In order to solve the above problems, the photoelectric conversion element of the present invention comprises: A photoelectric conversion element provided in the power generation space of the indoor solar power generation building, a direct light receiving section that can directly receive sunlight that has entered the indoor space through the sunlight transmitting section; a reflected light receiving portion capable of receiving reflected light reflected by the reflector; characterized in that it is provided with

[0013] According to this photoelectric conversion element, In addition to the fact that sunlight received indoors from the sunlight-transmitting section is mainly received directly by the direct light-receiving section, sunlight received indoors from the sunlight-transmitting section and reflected by the reflector is mainly received by the reflected light-receiving section that can receive reflected light reflected by the reflector, resulting in efficient solar power generation. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a front view showing an embodiment of an indoor solar power generation building and a photoelectric conversion element according to the present invention. [Figure 2]FIG. 1 is a schematic front view of an embodiment in which a power generation space is provided on the top floor of a building. [Figure 3] 1A and 1B are diagrams showing an embodiment in which multiple photovoltaic converters are provided inside an indoor solar power generation building, in which (a) is a schematic plan view, (b) is a view taken along the arrow bb in FIG. 1A, and (c) is a view taken along the arrow cc in FIG. 1A. [Figure 4] FIG. 2 is a front view showing an embodiment of a photoelectric conversion element. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of an indoor solar power generation building and a photoelectric converter according to the present invention will be described with reference to the drawings. In each drawing, the same or corresponding parts are designated by the same reference numerals.

[0016] The indoor solar power generation building 1 shown in FIG. A building having a floor 10, walls 20, and a ceiling 30, and a power generation space GS for installing a photoelectric converter 50 therein that receives sunlight SL and converts it into electricity, At least the ceiling portion 30 in the power generation space GS is provided with a sunlight transmitting portion 40 that allows sunlight SL to enter the interior (power generation space GS), At least a part of the floor 10 and the wall 20 in the power generation space GS is provided with a reflector 41 that reflects sunlight SL1 that has entered the room through the sunlight transmitting portion 40.

[0017] In the embodiment shown in Figure 1, the entire south wall portion 20s and the entire ceiling portion 30 are sunlight-transmitting portions 40, but the sunlight-transmitting portions 40 may also be provided on at least a portion of the ceiling portion 30 and a portion of the wall portion 20. In the embodiment shown in FIG. 1, the reflector 41 is provided on the entire surface of the floor 10, the entire surface of the north wall 20n, the entire surface of the east wall 20e (see FIG. 3(a)), and the entire surface of the west wall 20w (see FIG. 3(a)). However, the reflector 41 may be provided on at least a portion of the floor 10 and the wall 20 in the power generation space GS. For example, the reflector 41 may be provided on part or all of the floor 10, part or all of the wall, or part and / or all of the floor 10 and part and / or all of the wall. If the sunlight-transmitting section 40 is not provided on the south wall 20s, the reflector 41 may be provided on all or part of the south wall 20s. Note that, here, "the entire surface" or "the entire surface" includes the meaning of the entire surface excluding the pillars and beams of the building, or the entire surface excluding the entrance and exit area.

[0018] With the above-described configuration, the indoor solar power generation building 1 can provide the following effects.

[0019] By irradiating sunlight SL1 received indoors through sunlight transmitting section 40 provided on ceiling section 30 onto photoelectric converter 50 installed in power generation space GS, solar power generation can be performed indoors.

[0020] Furthermore, at least a portion of the floor 10 and wall 20 in the power generation space GS is provided with a reflector 41 that reflects sunlight SL1 received indoors through the sunlight-transmitting portion 40, so that sunlight SL2 reflected by this reflector 41 can also be directed at the photoelectric conversion body 50 to generate electricity.

[0021] Therefore, according to this indoor solar power generation building 1, sunlight SL received within the building (power generation space GS) can be efficiently utilized, enabling more efficient solar power generation.

[0022] For example, as shown in FIG. 2, the building 1 may be a two-story building or more, with the power generation space GS provided on the top floor 1t of the building 1.

[0023] When configured like this, By providing the power generation space GS on the top floor 1t, which is expected to be the sunniest floor of the building 1, it is expected that more efficient solar power generation will be possible, and the floor 1b below the top floor 1t will be able to be used for purposes other than solar power generation.

[0024] As shown in FIG. 1, the photoelectric conversion element 50 includes: Mainly, a direct light receiving section 51 that can directly receive sunlight SL1 that is received indoors through the sunlight transmitting section 40, The reflector 41 is mainly provided with a reflected light receiving portion 52 that can receive the reflected light SL2 reflected by the reflector 41.

[0025] According to this photoelectric conversion element 50, The sunlight SL1 received indoors from the sunlight transmitting section 40 is mainly received directly by the direct light receiving section 51, and the reflected light SL2 received indoors from the sunlight transmitting section 40 and reflected by the reflector 41 is mainly received by the reflected light receiving section 52, resulting in efficient solar power generation.

[0026] Depending on the installation position of the sunlight transmitting section 40, the shape and structure of the direct light receiving section 51, the shape and structure of the reflected light receiving section 52, and the installation position and shape and structure of the reflector 41, sunlight SL1 may be directly received by the reflected light receiving section 52, or reflected light SL2 may be directly received by the light receiving section 51.

[0027] This will be explained in more detail below. The basic structure of the building 1 itself can be any suitable known basic structure.

[0028] The sunlight transmitting portion 40 can be made of a known sunlight transmitting material (for example, glass, transparent synthetic resin).

[0029] The reflectors 41 provided on the floor 10 and the wall 20 can be made of any known appropriate reflecting material (including sheet-like reflecting material and tape-like reflecting material) that can reflect sunlight. The reflective surface is preferably an uneven surface, such as that shown in Figure 1, so that light is diffused inside the building (inside the power generation space GS). The uneven surface may be a corrugated surface or a surface made up of continuous hemispheres (including spherical crown surfaces). Furthermore, as shown in Figure 3, for example, it is desirable to use curtain- or blind-like reflectors that can be opened and closed according to the solar orientation as reflectors 41e and 41w provided on the east-facing wall 20e and the west-facing wall 20w in order to improve the efficiency of solar power generation.

[0030] A known solar cell can be used for the light receiving portion of the photoelectric converter 50. A multi-junction cell, a space cell, a sheet-shaped or film-shaped solar cell, or the like can be used. The photoelectric conversion element 50 is preferably configured as a power generation device that is not restricted in the power generation method and is lightweight enough to be handled by human power. In the photoelectric converter 50 shown in FIG. 1, the direct light receiving section 51 that receives direct light (SL1) is structured to generate electricity at a concentration of 100 to 2000 times using a parabolic dish-type Cassegrain optical tracking and concentrating device, rod lenses, and multi-junction cells, and the reflected light receiving section 52 is composed of a solar cell sheet (52) cylindrically attached to the outer periphery of the primary mirror that forms the direct light receiving section 51, parallel to the direct light, and can be structured to receive scattered light (SL2).

[0031] The invention relating to the indoor solar power generation building or indoor solar power generation as described above will be further described below.

[0032] This invention is an indoor solar power generation building in which a solar power generation device (50) is housed inside a building with exterior walls that transmit sunlight. This building 1 can be designed on the premise that it is not subject to external forces other than earthquake forces and the outside air, and it can be any building with sufficient strength to perform its specified power generation function. The selection of constituent materials can be expanded from metal materials to lightweight materials such as wood materials, fiber materials, resin materials, membrane materials, carbon materials, ceramic materials, paints, and composite materials with metals.

[0033] The photoelectric converter can be used in a wide range of applications, including multi-junction cells, space batteries, and sheet or film solar cells. Use in indoor environments can broaden the range of materials for constructing solar cells, enabling the construction of a power generation device (50) that is lightweight enough to be handled by human power. More specifically, the device is designed on the premise that it is not subject to external forces other than earthquakes or the outside air, and has sufficient strength to perform the required power generation function. The components can be made of lightweight materials, such as metals, wood, fiber, resin, membrane, carbon, ceramic, paint, and composites with metals.

[0034] The building 1 of this invention can trap sunlight that enters the building with reflective materials (41) installed on the walls and floors, increasing the amount of received light. The building and the power generation device (group (Figure 3)) function as a power generation device together, demonstrating high power generation capacity through the synergistic effect of direct light and reflected light.

[0035] This invention improves factors that reduce power generation due to indoor storage and adds factors that promote power generation, thereby achieving longer life, higher efficiency, labor savings, and lower costs.

[0036] Factors that reduce power generation include dust, rain, snow, wind, hail, sleet, lightning, typhoons, tornadoes, downbursts, fine dust, yellow sand, volcanic ash, salt damage, pollen, flying objects, vibration, shock, damage, deformation, and other external forces, metal fatigue, moisture, ultraviolet rays, and temperature deterioration, high-temperature loss, electrical leakage, fire, difficulty of maintenance and inspection, bird and animal damage, weeding, theft, light pollution, soil erosion, and damage to the natural environment and landscape. The building of this invention can improve these factors. Furthermore, by blocking outside air, the power generation equipment (50) is protected and the power generation environment is improved.

[0037] Factors that promote power generation include clean rooms, air conditioning, low-temperature benefits, reduced causes of malfunctions, liberalization of device structure, larger battery area, solar cells containing Pb·As·Ca, solar cells containing compounds that are difficult to use outdoors, automation, reduced and standardized maintenance work, easier equipment updates, use of digital technology, and relaxed system development requirements. The building of this invention can add factors that promote power generation.

[0038] This invention allows for the installation of an indoor power generation system (power generation space GS) on the top floor of a building with two or more floors, allowing the floors below to be used for other purposes, thereby enabling the effective use of limited land.

[0039] The following explanation will be given with reference to Figure 4. In the photoelectric converter 50, the direct light receiving section 51 that receives direct light (SL1) is structured to generate electricity at a concentration of 100 to 2000 times using a parabolic dish-type Cassegrain optical tracking and concentrating device 53, a rod lens 54, and a multi-junction cell 55, and the reflected light receiving section 52 is structured so that solar cell sheets 52s are provided on both the inside and outside of a base 52b that is cylindrically attached to the outer periphery of the primary mirror that forms the direct light receiving section 51 and is parallel to the direct light, and can be structured to receive scattered light (SL2 (Figure 1)). With power generation using this configuration, direct and scattered light from sloped solar radiation are received simultaneously to increase the amount of power generated, and in addition, the concentrated direct light is dispersed by the dichroic mirror 56 to thermoelectrically convert the long wavelength range that does not contribute to power generation in the multi-junction cell, and the amount of light received can be further increased by using a reflective structure that confines incident light to irradiate the photoelectric converter 50 with the direct light that does not pass through the light receiving section 51 as reflected light (SL2 (Figure 1)). The axial length ratio of the cylindrical solar cell sheet 52s provided inside and outside the base 52b shown in Figure 4 is 0.5:1.

[0040] Currently, most commercial solar power generation equipment and systems are stationary power generation systems, in which power generation panels are laid out on a large outdoor plot of land at an angle of about 30 degrees south. As the number of systems in operation increases, problems such as damage to the natural environment and landscape, as well as light pollution, have been pointed out, and regulations are being strengthened. Although various types of tracking and concentrating solar power generation that can be operated outdoors have been proposed, they are still in the research and experimental stage and have not yet reached the practical stage where they can be widely used. The reason for this is presumably due to the low cost-effectiveness caused by the weight of the equipment and the durability of the equipment structure against the external environment. Effective utilization of solar energy is an international and national imperative to curb global warming.

[0041] In view of the above, the present invention proposes a practical, highly safe, and cost-effective power generation system.

[0042] The hangars or shelters covered with a transparent material that transmits sunlight and that can constitute the building 1 of the present invention can be, for example, system buildings, agricultural greenhouses, glass greenhouses, tent warehouses, prefabricated warehouses, and so on, and can employ structures specialized for power generation. Since they can basically be made like warehouses, they are subject to warehouse building standards. Regarding the technical difficulty of resisting external forces, warehouse buildings with established design standards are highly reliable, and there are various types, but currently, membrane structure exterior walls are considered advantageous.

[0043] When installing an indoor power generation system (power generation space GS) on the top floor of a building with two or more floors, it is possible to add a hangar or shelter-like structure to the roof, or to design the top floor as part of the building. The higher the installation location, the less obstructions there are, making it more advantageous for power generation. If an indoor power generation system (power generation space GS) is installed on the second floor, the basement can be used for another purpose, doubling the utilization rate of the land.

[0044] The amount of electricity generated by this system is expected to be about twice that of a fixed power generation system installed at 30 degrees south, which will triple the utilization rate, allowing for more efficient land use and improving cost-effectiveness.

[0045] The power generation environment is affected by the shade cast by the building's framework, and the building itself requires maintenance and inspection. The shade of the framework material reduces the amount of incident light and decreases the amount of power generation, but scattered light does not create a shade, so by providing the reflected light receiving portion 52, it is possible to suppress the decrease in power generation efficiency.

[0046] The main task of the maintenance and inspection of buildings in accordance with the present invention is cleaning the exterior walls, which are made of transparent material (40). However, since the cleaning is uniform over a large area, it can be mechanized, and efficiency can be improved by utilizing drones and cleaning equipment.

[0047] From the above, it can be seen that indoor power generation, which has a high effect of improving and promoting factors that reduce power generation, is more profitable than outdoor power generation.

[0048] A wide variety of conventional outdoor power generation systems have been invented and developed, so it is not appropriate to specify them. The same applies indoors, and various systems can be considered for the present invention. According to the present invention, indoor construction allows for weight reduction and an improved and maintained power generation environment, so it is expected that design options will be greatly expanded, such as allowing chemical substances that are difficult to use outdoors to be used indoors under controlled conditions, and that this will promote the development of new power generation systems.

[0049] The size and placement of the equipment corresponds to the building scale determined by the terrain constraints. In terms of high efficiency and light weight, the above-mentioned two-axis tracking concentrator power generation device (50) is currently considered to be advantageous. Expensive multi-junction batteries or space batteries can be miniaturized by concentrating light 100 to 2000 times, reducing manufacturing costs and mass to 1 / 100 to 1 / 2000, and changing them from being a major component of power generation to just a part of the system. This will result in the main parts of the device being made into a unitized BOS structure (support frame structure), and the cost structure will shift to parts where weight reduction will have a significant effect on reducing manufacturing costs.

[0050] A solar power generation device can be a collection of unitized parts, similar to an automobile, and the proportion of mechanical parts will increase. For example, as shown in Figure 4, it can be divided into a base section 60, a drive control device for horizontal rotation (stepping motor) 61, a horizontal rotation section 62, a vertical rotation section (51), a support column (62), a primary mirror (51), a Cassegrain-based optical focusing section 53, a direct photovoltaic power generation section 55, and a scattered light reflection photovoltaic power generation section (52s), and can be made light enough to be handled by humans. In Figure 4, 57 is the secondary mirror (reflector and multilayer thin film), 51b is the primary mirror support frame (reinforced resin and wood) and skeletal material (reinforced resin, wood and metal), 51c is the backside reflective film (multilayer thin film), 58 is the infrared photovoltaic power generation unit (Peltier power generation (PETE power generation)), 63 is the electric reel for vertical rotation, and 64 is the wire for vertical rotation.

[0051] In the event of a malfunction in the device, the affected unit can be replaced, making the work easier, and defective parts other than the solar cell and motor can be repaired and reused. Because the behavior of tracking the sun is simple, the areas of concern can be identified by accumulating malfunction data.

[0052] This makes it easy to maintain and repair the equipment, restore power generation efficiency, replace solar cells to update to the latest equipment, and improve the BOS structure. Furthermore, when light is concentrated 500 times, the power generation efficiency improves by approximately 25% compared to when light is not concentrated, making the multi-junction cell highly effective. Sheet or film solar cells can eliminate the glass and frame materials of conventional plate solar cells, making them significantly lighter, and their coating-type manufacturing method reduces manufacturing costs and allows for larger areas. Furthermore, their flexibility allows them to bend, making them suitable for use in the power generation device (50) described above.

[0053] When installing multiple photoelectric converters (power generation devices) 50 in the power generation space GS, it is desirable to arrange the power generation devices (50) in a stepped manner with the primary mirrors 51 arranged from the south face to the north face, as shown in Figure 3, in order to maximize the amount of power generated. The stepped arrangement allows for narrower spacing between devices on a plane, increasing the number of devices, and also expanding the light receiving range in the vertical direction. When the sun's altitude is low, the amount of light received by each device is reduced due to the device being shaded, but the group of devices still functions to generate electricity. Expanding the vertical range of light reception is effective in winter when the sun's altitude is low and the shadows become longer.

[0054] In an indoor power generation system, there are four types of sunlight that enter the power generation equipment: (1) direct light and (2) scattered light from the slope of the solar radiation; (3) long-wavelength light (infrared light) related to the thermoelectric conversion of direct light; and (4) reflected light from direct light due to the light confinement effect inside the building. In this system, which simultaneously uses tracked and concentrated direct and scattered light to generate electricity, the amount of solar radiation on slopes, which has annual solar radiation that is about 1.6 times higher than that on horizontal surfaces, is utilized to the maximum, increasing the amount of power generated and increasing the number of areas where cost-effectiveness is achieved.

[0055] The improvement of the power generation capacity of the power generation device (50) promotes the weight reduction, high efficiency, and cost reduction of the device, and allows for the utilization of the building's functions. This advantage is only possible with an indoor power generation system.

[0056] In the future, it may be possible to maximize the total amount of power generated and cost-effectiveness by utilizing the four types of solar energy mentioned above. There are no restrictions on the power generation method, but the methods currently envisioned, including methods that require technological development, are listed below, excluding the high efficiency of solar cells that are currently underway as part of a national project.

[0057] Method 1: A power generation method using the power generation device (50) of the present invention (tracking and focusing type: direct light + scattered light + reflected light + infrared light) Method 2: Power generation using spherical or cylindrical power-generating films (fixed type: direct light + scattered light + reflected light) Method 3: Tracking bifacial power generation method (tracking: direct light + scattered light + reflected light) Method 4: Lightweight fixed bifacial power generation method (fixed type: direct light + scattered light + reflected light)

[0058] The indoor power generation system according to the present invention has the following advantages. In an indoor power generation system, the power generation system cost is the sum of the construction cost of the hangar and the cost of the power generation equipment. Because the cost of indoor power generation equipment can be significantly reduced, ultimately the deciding factor between outdoor and indoor power generation methods will be a comparison of the outdoor power generation system cost with the building construction cost and total power generation. Indoor power generation systems have a high construction cost, and have a strong real estate investment aspect, making them a stable investment. Furthermore, improvements and upgrades to the power generation system are easy because they are carried out indoors using lightweight, unitized parts, and equipment and maintenance costs are low, making the investment cost highly cost-effective. The useful life of outdoor fixed power generation is determined by the power generation panel and is generally said to be 25 years. The lifespan of an indoor system is determined by the building, as the equipment is protected indoors and can be easily updated. The service life of a building is determined by the standards of the skeletal materials, but buildings with a service life of 30 years or more are generally constructed, and the service life of an indoor power generation system can be made the same as that of the building, and further extension is also possible. Extending the service life increases power generation and reduces initial costs. This will promote increased revenue and reduced expenses, which are the most important factors for corporate management, and increase profit margins. In the future, technology will be developed to optimize land use and business activities by constructing buildings with solar-powered self-generation capabilities on the top floors of buildings, two floors or higher, and to pursue safety, durability, and cost reduction in power generation and buildings. The indoor power generation system is an invention that takes advantage of the fact that sunlight, which generates a large amount of energy, has no mass. The significant weight reduction and long durability of the power generation equipment, as well as the benefits of utilizing buildings specifically for power generation and utilizing multi-layered land, are noteworthy features that are not available with outdoor solar power generation or other types of power generation.

[0059] Although the embodiments and specific examples of the present invention have been described above, the present invention is not limited to the above-described embodiments and specific examples, and can be modified appropriately within the scope of the gist of the present invention. [Explanation of symbols]

[0060] 1: Indoor solar power buildings 10: Floor 20: Wall 30: Ceiling 40: Sunlight transmission part 50: Photoelectric conversion element 41: Reflector 51: Direct light receiving section 52: Reflected light receiving part

Claims

1. A building having a floor (10), walls (20), and a ceiling (30), and having a power generation space (GS) for installing a photoelectric converter (50) therein that receives sunlight (SL) and converts it into electricity, a sunlight transmitting section (40) that allows sunlight (SL) to enter the interior of the power generation space (GS) is provided at least on the ceiling section (30); a reflector (41) that reflects sunlight (SL) received indoors through the sunlight-transmitting portion (40) is provided on at least a portion of the floor portion (10) and the wall portion (20) in the power-generation space (GS); The reflecting surface of this reflector (41) is a corrugated surface or a concave-convex surface formed by connecting hemispherical surfaces, The photoelectric conversion element (50) is a direct light receiving section (51) that can directly receive sunlight (SL1) that is received indoors mainly through the sunlight transmitting section (40); a reflected light receiving portion (52) capable of receiving mainly reflected light (SL2) reflected by the reflector (41); Equipped with The direct light receiving unit (51) is a parabolic dish type, and the reflected light receiving unit (52) is a cylindrical reflected light receiving unit provided on the circular outer periphery of the direct light receiving unit (51) in parallel with the direct light.

2. In claim 1, This indoor solar power generation building is characterized in that the reflectors (41e, 41w) provided on the east wall (20e) and the west wall (20w) are curtain- or blind-like reflectors that can be opened or closed according to the solar orientation.

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