Panel for construction

Abstract

To restrain excessive temperature rise of a panel for construction.SOLUTION: A front surface of a panel body 2 comprises an inner bottom surface 22 enclosed by an annular outer frame 21, multiple ribs 23 erected forward from the inner bottom surface 22 and supporting a solar battery panel 3, an upper void space 42U formed between an upper side inner wall 21u of the outer frame 21 and the rib 23 and becoming an exhaust part, and a lower void space 42D formed between a lower side inner wall 21d of the outer frame 21 and the rib 23 and becoming an intake part. The solar battery panel 3 supported by the ribs 23 is constituted not to close the upper void space 42U and the lower void space 42D, and an air flow channel AC to pass air flowed in from the lower void space 42D toward the upper void space 42U is formed between the inner bottom surface 22 of the panel body 2 and a back surface (a resin layer 31) of the solar battery panel 3.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a building panel.

Background Art

[0002] As a building panel used for a fence or an outer wall of a building, etc., a panel having a reinforcing resin layer provided on the surface of a core material made of a foamed resin is known. For example, Patent Document 1 describes a fence having a polyurea resin layer provided on the surface of a core material made of a plate-shaped foamed resin. Since the core material of this building panel is made of a foamed resin, it is lighter than a general building panel. Therefore, construction can be facilitated, and damage at the time of collapse of a fence or a building can be reduced.

[0003] In recent years, in order to increase the amount of renewable energy generated, the use of solar panels on buildings and the like has been recommended. By attaching a solar panel to a panel body having a resin layer provided on the surface of a core material made of a foamed resin to form a building panel, a building panel having a power generation function, being lightweight and easy to handle can be realized. And by popularizing the said building panel, the amount of renewable energy generated can be increased.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, since the above-described building panel uses a foamed resin as the core material, it is difficult for the heat accumulated inside to be discharged due to exposure to sunlight or the like. Depending on the season and environment, the temperature of the building panel may become too high, which may deteriorate the solar cell panel provided in the building panel. The present invention has been made in view of such circumstances, and an object thereof is to suppress an excessive temperature rise of a building panel.

Means for Solving the Problems

[0006] In order to solve the above problems, the present invention provides a panel body including a core material made of a foamed resin and a resin layer coated and formed on at least the front surface of the core material, and a solar cell panel supported on the front surface of the panel body with its back surface facing. A building panel comprising: an inner bottom surface surrounded by an annular outer frame on the front surface of the panel body; a plurality of support portions protruding forward from the inner bottom surface to support the solar cell panel; and an upper space formed between the inner wall of the upper side of the outer frame and the support portion and serving as an exhaust portion, and a lower space formed between the inner wall of the lower side of the outer frame and the support portion and serving as an intake portion. The solar cell panel supported by the support portion is configured not to block the upper space and the lower space, and an air flow path is formed between the inner bottom surface of the panel body and the back surface of the solar cell panel to flow the air flowing in from the lower space toward the upper space.

Effects of the Invention

[0007] According to the present invention, an excessive temperature rise of a building panel can be suppressed.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the components, types, combinations, shapes, relative arrangements, etc. described in each embodiment are not intended to limit the scope of the present invention only thereto, but are merely illustrative examples. For example, in the following description, a wall composed of building panels will be taken as an example, but an outer wall material used for the outer wall of a building can also be obtained by changing the width, height, thickness, etc. Further, the respective dimensional values shown in the following description are examples and are not limited to those dimensional values.

[0010] <Overview of the building panel 1 according to the first embodiment> FIG. 1 is a perspective view of a wall 100 composed of building panels 1 according to the first embodiment, FIG. 2 is an exploded perspective view of the building panel 1, and FIG. 3 is a longitudinal sectional view showing the air flow inside the building panel 1. The example shown in FIG. 1 is a wall 100 formed by horizontally connecting a plurality of building panels 1 in a vertical state along the left - right direction (horizontal direction). As shown in FIG. 2, each building panel 1 has a vertically long rectangular and thick panel body 2, a vertically long rectangular and thin solar panel 3, an upper cavity - forming member 4U having a long rectangular - tube shape along the left - right direction, and a lower cavity - forming member 4D having a long rectangular - tube shape along the left - right direction. A plurality of upper cavities 42U are formed in the upper cavity - forming member 4U, and a plurality of lower cavities 42D are formed in the lower cavity - forming member 4D.

[0011] As shown in FIG. 3, the panel body 2 includes a core material 2a made of foamed resin and a resin layer 2b coated and formed on the entire surface of the core material 2a. As shown in FIG. 2, an annular outer frame 21 is provided along the four sides of the front surface of the panel body 2. An inner bottom surface (inner back surface) 22 is provided at a position surrounded by the outer frame 21 and recessed from the front surface 21a of the outer frame 21. A plurality of ribs 23 project forward from the inner bottom surface 22. Each rib 23 extends in the vertical direction (the air flow direction) and is provided at intervals in the left - right direction (the crossing direction intersecting the air flow direction). Each rib 23 is an example of a support portion for supporting the solar panel 3, and the back surface of the solar panel 3 is fixed to the front surface of each rib 23 by adhesion or the like. That is, the solar panel 3 is supported with its back surface facing the front surface of the panel body 2. As shown in FIG. 3, when the solar panel 3 is supported by each rib 23, an air flow path AC is formed between the inner bottom surface 22 of the panel body 2 and the back surface of the solar panel 3.

[0012] As shown in FIG. 2, the horizontal length W3 of the solar cell panel 3 is substantially equal to the opening width (width of the inner peripheral edge) W21 of the outer frame 21, but the vertical length H3 of the solar cell panel 3 is shorter than the opening length (height of the inner peripheral edge) H21 of the outer frame 21, and is substantially equal to, for example, the vertical length H23 (see FIG. 7(a)) of each rib 23. The solar cell panel 3 is supported by each rib 23 with the upper side of the panel, the upper ends of each rib 23, and the lower side of the panel, the lower ends of each rib 23 being aligned. In other words, the solar cell panel 3 in a state supported by the rib 23 is configured not to block the upper cavity 42U formed in the upper cavity forming member 4U and the lower cavity 42D formed in the lower cavity forming member 4D.

[0013] As a result, a gap for attaching the upper cavity forming member 4U is formed between the upper side (upper ends of each rib 23) of the solar cell panel 3 and the inner wall of the upper side of the outer frame 21. Similarly, a gap for attaching the lower cavity forming member 4D is formed between the lower side (lower ends of each rib 23) of the solar cell panel 3 and the inner wall of the lower side of the outer frame 21. As shown in FIG. 3, when the upper cavity forming member 4U is attached to the upper gap, the upper cavity 42U (exhaust portion) provided in the upper cavity forming member 4U communicates with the air flow path AC. Similarly, when the lower cavity forming member 4D is attached to the lower gap, the lower cavity 42D (intake portion) provided in the lower cavity forming member 4D communicates with the air flow path AC.

[0014] The arrow AF shown in FIG. 3 indicates the flow of air. In this building panel 1, the air flow path AC circulates the air flowing in from the lower cavity 42D toward the upper cavity 42U. For example, when the air temperature in the air flow path AC rises due to receiving sunlight and becomes higher than the outside air temperature, an air flow is generated by the chimney effect. That is, the air in the air flow path AC has a reduced density and rises, and is discharged from the upper cavity 42U. Then, as the air in the air flow path AC rises, outside air flows into the air flow path AC through the lower cavity 42D. Since the outside air temperature is lower than the air temperature in the air flow path AC, the air in the air flow path AC is heated by the heat accumulated in the building panel 1, and the heated air is discharged from the building panel 1. As a result, an excessive temperature rise of the building panel 1 is suppressed, and consequently, an excessive temperature rise of the solar cell panel 3 is also suppressed.

[0015] <First Embodiment> Next, the building panel 1 of the first embodiment will be described in detail. FIG. 4 is a front view of the building panel 1, FIG. 5 is a cross-sectional view of the building panel 1, FIG. 6(a) is a longitudinal sectional view of the building panel 1 cut between the ribs 23, FIG. 6(b) is a longitudinal sectional view of the building panel 1 cut at the position of the ribs 23, FIG. 7(a) is a front view of the panel body 2, FIG. 7(b) is a perspective view of the panel body 2 viewed from the upper left diagonal direction, FIG. 7(c) is a cross-sectional view of the panel body 2, FIG. 8(a) is a perspective view of the void forming member 4 (upper void forming member 4U, lower void forming member 4D) viewed from the front side, and FIG. 8(b) is a perspective view of the void forming member 4 viewed from the back side.

[0016] As shown in FIGS. 4 and 5, the building panel 1 has a vertically long rectangular shape when viewed from the front. For example, the width W1 is 1000 mm, the height H1 is 1500 mm, and the thickness D is 150 mm, but it is not limited to these dimensions. The building panel 1 is configured by attaching a solar cell panel 3, an upper void forming member 4U, and a lower void forming member 4D to the front surface of the panel body 2.

[0017] <Panel Body 2> As shown in FIGS. 5 and 6, the panel body 2 includes a foam resin core material 2a and a resin layer 2b covering each surface of the core material 2a. In this embodiment, the core material 2a is made of urethane foam, and the resin layer 2b is a polyurea resin layer. When the resin layer 2b is configured by a polyurea resin layer, maintenance such as overcoating the polyurea resin can be simplified because of its high weather resistance. Note that the material of the core material 2a is not limited to foamed urethane, and the material of the resin layer 2b is not limited to polyurea resin. For example, foamed polystyrene may be used for the core material 2a, and the resin layer 2b may be a polyurethane resin layer.

[0018] When the resin layer 2b is constituted by a polyurea resin layer, the thickness of the resin layer 2b is, for example, about 0.3 mm to 2 mm. The thickness of the resin layer 2b can be adjusted by the number of sprayings of the polyurea resin. For example, since the thickness of the resin layer 2b formed by one spraying operation is about 0.3 mm, by repeating the spraying operation twice, a resin layer 2b with a thickness of about 0.6 mm can be formed, and by repeating the spraying operation seven times, a resin layer 2b with a thickness of about 2.1 mm can be formed.

[0019] As shown in FIGS. 7(a) to (c), on the front surface of the panel body 2, a rectangular outer frame 21 is provided along the four sides of the panel body 2. In the present embodiment, the width WD21 of the outer frame 21 is, for example, 125 mm. In this case, the width W21 of the inner peripheral edge of the outer frame 21 is 750 mm, and the height H21 of the inner peripheral edge of the outer frame 21 is 1250 mm, but it is not limited to these dimensions.

[0020] In the portion surrounded by the outer frame 21 on the front surface of the panel body 2, an inner bottom surface 22 (inner back surface) provided at a recessed position behind the front end surface of the panel body 2, an upper cavity forming member 4U, and a lower cavity forming member 4D (both refer to FIG. 4 etc.) are fixed to a forming member fixing portion 24, and a plurality of ribs 23 protruding forward from the inner bottom surface 22 are provided. As shown in FIG. 7(c), in the present embodiment, the inner bottom surface 22 is provided at an intermediate position in the thickness direction of the panel body 2 (for example, a position 75 mm away from the front end surface of the panel body 2 toward the rear), but it is not limited to this position.

[0021] The forming member fixing portion 24 includes a left forming member fixing portion 24L provided between the left end of the inner bottom surface 22 and the left side of the outer frame 21, and a right forming member fixing portion 24R provided between the right end of the inner bottom surface 22 and the right side of the outer frame 21. Each forming member fixing portion 24 has a narrow rectangular shape with its front surface extending along the vertical direction (up and down direction), and the front surface is provided at a position between the front end surface of the panel body 2 and the inner bottom surface 22. The upper space forming member 4U has its left end portion on the back surface fixed to the upper end portion of the left forming member fixing portion 24L by adhesion or the like, and its right end portion on the back surface fixed to the upper end portion of the right forming member fixing portion 24R by adhesion or the like. Similarly, the lower space forming member 4D has its left end portion on the back surface fixed to the lower end portion of the left forming member fixing portion 24L by adhesion or the like, and its right end portion on the back surface fixed to the lower end portion of the right forming member fixing portion 24R by adhesion or the like.

[0022] The plurality of ribs 23 are support portions for supporting the solar cell panel 3 and are flow path forming members for forming the air flow path AC together with the solar cell panel 3. Each rib 23 protrudes forward from the inner bottom surface 22 and extends along the vertical direction, and is provided at intervals along the left - right direction (cross direction). The plurality of ribs 23 and the solar cell panel 3 form a plurality of elongated air flow paths AC extending along the vertical direction (the air flow direction) inside the building panel 1 (see FIGS. 5, 6(a), etc.). Since each air flow path AC is elongated in the air flow direction, the air flow velocity can be increased compared with a configuration without the ribs 23. Also, in this embodiment, since each rib 23 has a shape extending along the vertical direction, the deflection of the panel body 2 in the front - rear direction can be suppressed.

[0023] As shown by reference numeral SP1 in FIG. 7(a), the upper ends of the ribs 23 are located below the inner wall 21u of the upper side of the outer frame 21, and as shown by reference numeral SP2, the lower ends of the ribs 23 are located above the inner wall 21d of the lower side of the outer frame 21. For example, the upper ends of the ribs 23 are located 85 mm below the inner wall 21u of the upper side of the outer frame 21, and the lower ends of the ribs 23 are located 85 mm above the inner wall 21d of the lower side of the outer frame 21, but are not limited to these positions.

[0024] The height (dimension in the front-rear direction) of each rib 23 indicated by reference numeral D23 in FIG. 7(c) is determined based on the thickness of the solar cell panel 3. For example, the height D23 of each rib 23 is determined such that when the solar cell panel 3 is fitted into the space in the inner peripheral portion of the outer frame 21 and the front surface of the solar cell panel 3 and the front end surface of the panel body 2 are flush, the back surface of the solar cell panel 3 abuts against the front surface of each rib 23. If, for example, the thickness D3 of the solar cell panel 3 (see FIG. 2. Note that the thickness D3 indicates the thickness of the frame portion that supports the outer periphery of the solar cell body) is 20 mm, the dimension in the front-rear direction of each rib 23 is such that the front surface of each rib 23 is located 20 mm behind the front end surface of the panel body 2. The solar cell panel 3 is supported by the plurality of ribs 23 by fixing the space between its back surface and the front surface of each rib 23 by means such as adhesion. Note that the interval in the left-right direction (cross direction) between each rib 23 and the number of ribs 23 are not particularly limited as long as the solar cell panel 3 can be supported by each rib 23.

[0025] <Solar cell panel 3> As shown in FIGS. 2, 4 to 7, the width W3 of the solar cell panel 3 is aligned with the width W21 of the inner peripheral edge of the outer frame 21, and the height H3 of the solar cell panel 3 is aligned with the length H23 in the vertical direction of the rib 23. In other words, the solar cell panel 3 is supported by the rib 23 so as not to block the upper space 42U formed in the upper space forming member 4U and the lower space 42D formed in the lower space forming member 4D. The back surface of the solar cell panel 3 is covered with a resin layer 31. In this embodiment, it is covered with a polyurea resin layer. The thickness of the polyurea resin layer is, for example, 0.3 mm to 0.6 mm. By reducing the thickness of the polyurea resin layer, heat from the solar cell panel 3 can be efficiently transferred to the air in the air flow path AC. In this embodiment, the resin layer 2b on the rib 23 side and the resin layer 31 on the solar cell panel 3 side are fixed by an adhesive or an adhesive sheet.

[0026] Since the outer surface of the panel body 2 is covered by the polyurea resin layer 2b and the back surface of the solar cell panel 3 is covered by the polyurea resin layer 31, the surface of the air flow path AC is covered by the polyurea resin. Since the polyurea resin can maintain water resistance and weather resistance over a long period of time, even if water enters the air flow path AC, deterioration of the polyurea resin due to water can be suppressed. Also, maintenance such as overcoating the polyurea resin can be simplified.

[0027] <Upper cavity forming member 4U and lower cavity forming member 4D> Next, the upper cavity forming member 4U and the lower cavity forming member 4D will be described. In the present embodiment, since the upper cavity forming member 4U and the lower cavity forming member 4D have the same configuration, they will be described together as the cavity forming member 4. As shown in FIGS. 8(a) and 8(b), the cavity forming member 4 includes a rectangular tube-shaped frame 41, a plurality of front cavities 42f provided along the left-right direction on the front surface of the frame 41, a plurality of rear cavities 42r provided along the left-right direction on the back surface of the frame 41, and a shutter operation portion 43 provided at the left end portion of the front surface of the frame 41.

[0028] The frame 41 is a rectangular tube member made of a material harder than the panel body 2 (for example, a metal material such as a stainless steel material), has a width (dimension in the left-right direction) W41 that is sufficiently larger than the height (dimension in the up-down direction) H41, and has a long shape in which the depth (dimension in the front-rear direction) D41 is smaller than the height H41. In the present embodiment, the width W41 of the frame 41 is aligned with the width W21 of the inner peripheral edge of the outer frame 21 (see FIG. 2), the height H41 of the frame 41 is aligned with the distance between the inner wall 21u of the upper side of the outer frame 21 and the upper ends of the respective ribs 23, and the depth of the frame 41 is aligned with the distance between the front surface 21a of the outer frame 21 and the front surface of the member fixing portion 24. Thus, when the cavity forming member 4 (upper cavity forming member 4U, lower cavity forming member 4D) is attached to the panel body 2, the front surface of the cavity forming member 4 becomes flush with the front surface of the panel body 2. Since the frame 41 is composed of a long member harder than the panel body 2, attaching it to the panel body 2 can suppress the lateral deflection of the panel body 2.

[0029] The front cavity 42f is formed by an opening, for example, having a vertically long oval shape, and a plurality of such openings are provided along the left - right direction. Similarly, the rear cavity 42r is also formed by an opening, for example, having a vertically long oval shape, and a plurality of such openings are provided along the left - right direction. Therefore, in the cavity forming member 4, the front cavity 42f and the rear cavity 42r communicate with each other through the cavity within the frame 41. And the upper cavity 42U provided in the upper cavity forming member 4U is composed of the front cavity 42f, the rear cavity 42r, and the cavity within the frame 41. Similarly, the lower cavity 42D provided in the lower cavity forming member 4D is also composed of the front cavity 42f, the rear cavity 42r, and the cavity within the frame 41.

[0030] Also, a shutter that is opened and closed by a shutter operation unit 43 is provided in the front cavity 42f. The shutter operation unit 43 includes an operation protrusion 43a that protrudes forward from an operation unit opening 41a provided at the left end of the front surface of the frame 41. The operation unit opening 41a is, for example, an opening elongated in the left - right direction. When the operation protrusion 43a is positioned at the left end of the operation unit opening 41a, the front cavity 42f is opened, and when the operation protrusion 43a is positioned at the right end of the operation unit opening 41a, the front cavity 42f is closed. When the shutter closes the front cavity 42f, the intrusion of rainwater, dust, etc. into the cavity forming member 4 is suppressed.

[0031] When the cavity forming member 4 (upper cavity forming member 4U, lower cavity forming member 4D) is attached to the panel body 2, the rear cavity 42r communicates with the air flow path AC. Therefore, when the shutter opens the front cavity 42f, air flows between the air flow path AC and the outside of the building panel 1, and when the shutter closes the front cavity 42f, the intrusion of rainwater, dust, etc. into the air flow path AC is suppressed.

[0032] <Function and Effect> As shown in FIG. 3, when sunlight irradiates the solar panel 3 with the shutter open and the air temperature in the air flow path AC rises, an air flow due to the chimney effect occurs. That is, the density of the air in the air flow path AC decreases, and the air rises in the air flow path AC as indicated by the arrow AF. The rising air is exhausted to the outside of the building panel 1 through the upper cavity 42U of the upper cavity forming member 4U. In addition, as the air in the air flow path AC rises, outside air is drawn into the air flow path AC through the lower cavity 42D of the lower cavity forming member 4D. Since the outside air is cooler than the air in the air flow path AC, when the outside air is allowed to flow into the air flow path AC, the heat accumulated in the building panel 1 heats the air in the air flow path AC, and the heated air is discharged from the building panel 1. As a result, an excessive temperature rise of the building panel 1 is suppressed, and consequently, an excessive temperature rise of the solar panel 3 is also suppressed.

[0033] <Second Embodiment> In the building panel 1 of the first embodiment described above, the upper cavity 42U as the exhaust portion, the lower cavity 42D as the intake portion, and the solar panel 3 were provided on the front surface of the building panel 1, but the configuration is not limited to this. FIG. 9 is a longitudinal sectional view of a building panel 1A according to a second embodiment in which the lower cavity 42D is provided on the back side of the panel body 2.

[0034] The building panel 1A illustrated in FIG. 9 has a structural feature in that a lower mounting cavity 25 for attaching the lower cavity forming member 4D is provided at the lower back of the panel body 2. The lower attachment space 25 is a horizontally long rectangular space whose upper side is provided at substantially the same height as the lower side of the solar cell panel 3, and the lower space forming member 4D is fitted therein. And the lower attachment space 25 communicates with the air flow path AC. The lower space forming member 4D is fitted into the lower attachment space 25 with the shutter operation part 43 shown in Fig. 8(a) facing the back side of the panel main body 2. Also, at the lowermost part of the air flow path AC, a downward inclined surface 26 that slopes downward toward the lower edge of the lower space forming member 4D is provided.

[0035] In the building panel 1A according to the second embodiment, the lower space 42D as the intake part is provided on the back side of the panel main body 2 located on the side opposite to the solar cell panel 3. From the viewpoint of effectively performing power generation, the building panel 1A is installed so that sunlight irradiates the solar cell panel 3 for a long time. Therefore, the back side of the building panel 1A (panel main body 2) on the side opposite to the solar cell panel 3 is shaded for a longer time compared to the front side where the solar cell panel 3 is provided, and the temperature rise of the air is suppressed accordingly.

[0036] And by providing the lower space 42D as the intake part on the back side of the panel main body 2, air with a suppressed temperature rise can be introduced into the air flow path AC, so that the temperature rise of the building panel 1A can be effectively suppressed. Also, since the above-described downward inclined surface 26 is provided at the lowermost part of the air flow path AC, water that has entered the air flow path AC can be efficiently discharged. Note that the building panel 1A according to the second embodiment can be particularly preferably used for the purpose of installing the solar cell panel 3 on the roof of a building.

[0037] <Third Embodiment> In the building panels 1 and 1A of the first and second embodiments described above, a plurality of ribs 23 extending along the vertical direction (the air flow direction) are provided at intervals along the horizontal direction (the intersecting direction), but the configuration is not limited to this. Figure 10 is an exploded perspective view of a building panel 1B according to a third embodiment in which a plurality of cylindrical panel support portions are provided on a panel body 2.

[0038] In the example shown in FIG. 10, a cylindrical panel support portion 27 is projected forward from the inner bottom surface 22 (inner back surface) of the panel body 2. And a plurality of panel support portions 27 are staggeredly arranged on the inner bottom surface 22 of the panel body 2. In the building panel 1B according to the third embodiment having the above configuration, an air flow path AC is formed between the inner bottom surface 22 of the panel body 2 and the back surface of the solar cell panel 3. When the temperature of the air in the air flow path AC rises, the air rises in the air flow path AC and is discharged from the upper cavity 42U, and outside air is sucked from the lower cavity 42D as the air in the air flow path AC rises. Since the temperature of the outside air is lower than the temperature of the air in the air flow path AC, the building panel 1B according to the third embodiment can also suppress the temperature rise of the building panel 1B.

[0039] <Fourth Embodiment> In the building panels 1, 1A, and 1B of the first to third embodiments described above, the flow of air is generated without using power, but the configuration is not limited to this. FIG. 11(a) is a longitudinal sectional view of a building panel 1C according to a fourth embodiment including an exhaust fan 51, a secondary battery 54, etc., and FIG. 11(b) is a block diagram showing the electrical configuration of the building panel 1C according to the fourth embodiment. In the example shown in FIG. 11(a), a fan 51 rotated by a fan motor 52 is provided in a space behind an upper cavity forming member 4U. The fan 51 sends out the air that has risen from the air flow path AC toward the front upper cavity 42U. The air that has risen in the air flow path AC and is sent out by the fan 51 is efficiently discharged to the outside of the building panel 1C through the upper cavity 42U. In addition, a temperature sensor 53 for detecting the air temperature in the air flow path AC is provided in the middle of the air flow path AC.

[0040] As shown in FIG. 11(b), in the building panel 1C, the solar panel 3 is electrically connected to the charge / discharge controller 55. The charge / discharge controller 55 is electrically connected to the secondary battery 54 and the control unit 56, and the control unit 56 is electrically connected to the fan motor 52 and the temperature sensor 53. Further, the charge / discharge controller 55, the control unit 56, the fan motor 52, and the temperature sensor 53 operate by the electrical energy stored in the secondary battery 54 or the electrical energy generated by the solar panel 3. The electrical energy generated by the solar panel 3 is input to the charge / discharge controller 55, stored in the secondary battery 54, or supplied to the control unit 56, the fan motor 52, and the temperature sensor 53.

[0041] The detection signal from the temperature sensor 53 is input to the control unit 56. The control unit 56 obtains the air temperature in the air flow path AC based on the input detection signal, and drives the fan motor 52 when the obtained air temperature is equal to or higher than a specified temperature. By driving the fan motor 52, the fan 51 rotates and sends the air that has risen through the air flow path AC toward the upper space 42U. Further, the control unit 56 stops the fan motor 52 when the obtained air temperature is lower than the specified temperature.

[0042] In the building panel 1C according to the fourth embodiment having the above configuration, since the air in the air flow path AC is sent toward the upper space 42U by the rotation of the fan 51, the air can be efficiently discharged, and the temperature rise of the building panel 1C can be suppressed. In the building panel 1C according to the fourth embodiment, the fan 51 is provided in the space behind the upper space forming member 4U, but the present invention is not limited to this configuration. The fan 51 may be provided at a location where the air in the air flow path AC can be sent toward the upper space 42U.

[0043] <Modification Example> In each of the foregoing embodiments, the building panels 1, 1A, 1B, and 1C for constructing the retaining wall 100 have been described, but the present invention is not limited thereto. For example, the building panels 1, 1A, 1B, and 1C may be used as an exterior wall material of a building, or may be installed on the roof of a building. When the building panels 1, 1A, 1B, and 1C are used as an exterior wall material of a building, the building panels 1, 1A, 1B, and 1C may be installed in an inclined state as long as the upper cavity 42U is located above the lower cavity 42D. Regarding the panel body 2, in each of the foregoing embodiments, all the surfaces of the core material 2a were covered with a polyurethane resin, but the present invention is not limited to this configuration. It is sufficient that at least the front surface of the core material 2a is covered with a resin. Regarding the solar panel 3, in each of the foregoing embodiments, the solar panel 3 having a frame portion with a thickness D3 of 20 mm has been described as an example, but the present invention is not limited thereto. For example, a solar panel 3 thicker than the illustrated solar panel 3 may be used, or a sheet-like solar panel 3 thinner and more flexible than the illustrated solar panel 3 may be used. Regarding the support portion of the solar panel 3, in the building panels 1, 1A, and 1C of the first, second, and fourth embodiments, it is constituted by a plurality of ribs 23, and in the building panel 1C of the third embodiment, it is constituted by a columnar panel support portion 27. However, as long as the air flow path AC can be formed, the present invention is not limited to these configurations. Regarding the cavity forming member 4, in each of the foregoing embodiments, a square tube member made of a material harder than the panel body 2 has been illustrated as an example, but the present invention is not limited thereto. For example, the cavity forming member 4 may be constituted by an angle member having through holes serving as the upper cavity 42U and the lower cavity 42D, or may be constituted by a mesh material and a frame body for supporting the outer periphery of the mesh material. When the cavity forming member 4 is constituted by a mesh material and a frame body, the upper cavity 42U and the lower cavity 42D correspond to the meshes (gaps between wire materials) of the mesh material.

[0044] [Summary of Embodiment Examples, Operations, and Effects of the Present Invention] <First Embodiment> The first embodiment is a building panel 1, 1A, 1B, 1C comprising a core material 2a made of foamed resin and a resin layer 2b coated and formed at least on the front surface of the core material 2a, and a solar cell panel 3 supported with its back facing the front surface of the panel body 2. On the front surface of the panel body 2, there are an inner bottom surface 22 surrounded by an annular outer frame 21, a plurality of support portions (ribs 23, panel support portions 27) protruding forward from the inner bottom surface 22 to support the solar cell panel 3, an upper cavity 42U formed between the inner wall 21u of the upper side of the outer frame 21 and the support portion serving as an exhaust portion, and a lower cavity 42D formed between the inner wall 21d of the lower side of the outer frame 21 and the support portion serving as an intake portion. The solar cell panel 3 supported by the support portion is configured not to block the upper cavity 42U and the lower cavity 42D. An air flow path AC is formed between the inner bottom surface 22 of the panel body 2 and the back surface of the solar cell panel 3 to flow the air flowing in from the lower cavity 42D toward the upper cavity 42U, which is characterized in that.

[0045] According to the building panels 1, 1A, 1B, 1C according to this embodiment, when the air temperature in the air flow path AC rises due to receiving sunlight or the like and the air temperature becomes higher than the outside air temperature, the air in the air flow path AC rises by the chimney effect and is discharged from the upper cavity 42U, and the outside air flows into the air flow path AC through the lower cavity 42D. Since the outside air temperature is lower than the air temperature in the air flow path AC, the heat of the solar cell panel 3 easily moves to the air in the air flow path AC due to the inflow of the outside air, and an excessive temperature rise of the building panels 1, 1A, 1B, 1C can be suppressed.

[0046] <Second Embodiment> In the building panels 1, 1A, 1C according to this embodiment, the support portion is composed of a plurality of ribs 23 extending along the air flow direction and provided at intervals along a crossing direction crossing the air flow direction, which is characterized in that. According to the building panels 1, 1A, 1C according to this aspect, compared with the configuration without the ribs 23, the width of the air flow path AC is narrowed, so the air flow velocity can be increased. In addition, since each rib 23 has a shape extending along the vertical direction, the deflection in the front-rear direction of the panel body 2 can also be suppressed.

[0047] <Third Embodiment> In the building panels 1, 1A, 1B, 1C according to this aspect, the upper cavity 42U is provided in an upper cavity forming member 4U constituted by a long member harder than the panel body 2. And the upper cavity forming member 4U is attached between the inner wall 21u of the upper side of the panel body 2 and the support portion along an intersecting direction intersecting the air flow direction. According to the building panels 1, 1A, 1B, 1C according to this aspect, the deflection in the left-right direction of the panel body 2 can be suppressed.

[0048] <Fourth Embodiment> In the building panels 1, 1B, 1C according to this aspect, the lower cavity 42D is provided in a lower cavity forming member 4D constituted by a long member harder than the panel body 2. And the lower cavity forming member 4D is attached between the inner wall 21d of the lower side of the panel body 2 and the support portion along an intersecting direction intersecting the air flow direction. According to the building panels 1, 1B, 1C according to this aspect, the deflection in the left-right direction of the panel body 2 can be suppressed.

[0049] <Fifth Embodiment> In the building panel 1A according to this aspect, the lower cavity 42D is provided on the back side of the panel body 2. In the building panel 1A according to this aspect, on the back side of the panel body 2 on the side opposite to the solar cell panel 3, the time in the shade is longer compared to the front side where the solar cell panel 3 is provided, and the rise in the temperature of the air is suppressed accordingly. Therefore, by providing the lower cavity 42D as the intake part on the back side of the panel body 2, the air with a suppressed temperature rise can be introduced into the air flow path AC, so that the temperature rise of the building panel 1A can be effectively suppressed.

[0050] <Sixth Embodiment> In the building panels 1, 1A, 1B, 1C according to this aspect, the resin layer 2b is a polyurea resin layer, and it is characterized in that another polyurea resin layer 31 is provided on the back surface of the solar cell panel 3. According to the building panels 1, 1A, 1B, 1C according to this aspect, the air flow path AC is covered by the polyurea resin layer. And since the polyurea resin layer can maintain water resistance and weather resistance over a long period, even if water enters the air flow path AC, deterioration of the polyurea resin layer due to water can be suppressed. Also, maintenance such as overcoating the polyurea resin can be simplified.

Description of Reference Numerals

[0051] 1, 1A, 1B, 1C... building panels, 2... panel body, 2a... core material, 2b... resin layer, 21... outer frame, 21a... front surface of the outer frame, W21... opening width of the outer frame, H21... opening length of the outer frame, 21u... inner wall of the upper side of the outer frame, 21d... inner wall of the lower side of the outer frame, 22... inner bottom surface (inner back surface) of the panel body, 23... rib, H23... vertical length of the rib, D23... front-rear height of the rib, 24... forming member fixing part, 24L... left forming member fixing part, 24R... right forming member fixing part, 25... lower mounting space, 26... downward inclined surface, 27... panel support part, 3... solar panel, W3... horizontal length of the solar panel, H3... vertical length of the solar panel, 31... resin layer on the back surface of the solar panel, 4... space forming member, 4U... upper space forming member, 4D... lower space forming member, 41... frame, W41... width of the frame, H41... height of the frame, D41... depth of the frame, 41a... operation part opening, 42U... upper space, 42D... lower space, 42f... front side space, 42r... rear side space, 43... shutter operation part, 43a... operation protrusion, 51... fan, 52... fan motor, 53... temperature sensor, 54... secondary battery, 55... charge and discharge controller, 56... control part, 100... fence, AC... air flow path, AF... air flow

Claims

1. A building panel comprising a core material made of a foamed resin, and a panel body having a resin layer coated and formed at least on the front surface of the core material, and a solar cell panel supported with its back surface facing the front surface of the panel body, wherein on the front surface of the panel body, an inner bottom surface surrounded by an annular outer frame, a plurality of support portions projecting forward from the inner bottom surface to support the solar cell panel, an upper cavity formed between the inner wall of the upper side of the outer frame and the support portion, which serves as an exhaust portion, a lower cavity formed between the inner wall of the lower side of the outer frame and the support portion, which serves as an intake portion, are provided, the solar cell panel supported by the support portion is configured not to block the upper cavity and the lower cavity, a building panel, characterized in that an air flow path is formed between the inner bottom surface of the panel body and the back surface of the solar cell panel to direct the air flowing in from the lower cavity toward the upper cavity.

2. The building panel according to claim 1, wherein the support portion is composed of a plurality of ribs extending along the air flow direction and spaced apart along an intersecting direction intersecting the flow direction.

3. The upper cavity is provided in an upper cavity forming member composed of a long member harder than the panel body, the upper cavity forming member is attached between the inner wall of the upper side of the panel body and the support portion along an intersecting direction intersecting the air flow direction. The building panel according to claim 1.

4. The lower cavity is provided in a lower cavity forming member composed of a long member harder than the panel body, the lower cavity forming member is attached between the inner wall of the lower side of the panel body and the support portion along an intersecting direction intersecting the air flow direction. The building panel according to claim 1.

5. The building panel according to claim 1, wherein the lower cavity is provided on the back side of the panel body.

6. The resin layer is a polyurea resin layer, The building panel according to claim 1, characterized in that another polyurea resin layer is provided on the back surface of the solar cell panel.

Images