Structure

Abstract

To provide a structure for improving solar heat collection efficiency.SOLUTION: The structure 100 includes a heat collecting member 10 capable of collecting heat by sunlight. The heat-collecting member 10 has a wall part 21, a hollow part 22 which is formed inside the wall part 21 and through which a heating medium to which heat by sunlight is transmitted can flow, and a projection part 23 which projects from the 21g of the outer surface of the wall part 21 to the D1 in the first direction. The projecting strip part 23 extends to a second direction D1 crossing the first direction D2, and the second direction D2 includes vertical components along a vertical direction in which gravity acts.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a structure. [Background technology]

[0002] Heat collecting elements that collect solar heat are known. Patent Document 1 discloses a solar heat collector having a hollow body that is extruded. The hollow body is installed so that its top wall faces the sun. Outward ribs are provided on the outer surface of the top wall of the hollow body to transfer solar radiant heat to the heat carrier flowing through the hollow body. The outward ribs are formed parallel to the axial direction of the hollow body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2008-544205 Summary of the Invention [Problem to be solved by the invention]

[0004] The solar heat collector disclosed in Patent Document 1 has an increased surface area due to the outward ribs, which increases the solar light receiving area and improves the efficiency of collecting radiant heat. At the same time, the increased light receiving surface area due to the outward ribs is thought to be able to collect heat through convective heat transfer from the surrounding heated air. However, depending on the orientation of the outward ribs, natural air convection around the outward ribs may be hindered, causing the air to stagnate around the outward ribs. In this case, the amount of heat from convective heat transfer made possible by the outward ribs may not be easily transferred to the heat carrier, leaving room for improvement in the efficiency of collecting solar heat.

[0005] The present invention provides a structure that improves the efficiency of collecting solar heat. [Means for solving the problem]

[0006] The present invention provides a structure comprising a heat collecting member capable of collecting heat generated by sunlight, the heat collecting member having a wall portion, a hollow portion formed inside the wall portion and through which a heat medium can flow to transfer the heat generated by sunlight, and a ridge portion protruding from the outer surface of the wall portion in a first direction, the ridge portion extending in a second direction intersecting the first direction, the second direction including a vertical component along the vertical direction in which gravity acts.

[0007] According to the structure of the present invention, the heat collecting member has ridges protruding in the first direction, which increases the surface area of ​​the heat collecting member and the contact area with the air compared to a structure without ridges. This results in improved solar heat collection efficiency. Furthermore, the air around the heat collecting member loses heat at the contact surface with the heat collecting member (the heat collecting member acquires heat from the air), causing its temperature to drop and its density to increase, resulting in vertically downward natural convection. However, because the second direction in which the ridges extend includes a vertical component, the air can flow smoothly along a plane intersecting the first direction, i.e., along the outer surface of the wall of the heat collecting member. This allows for efficient heat exchange between the heat collecting member and the air.

[0008] The heat collecting member may further include a main body portion having the wall portion, the hollow portion, and the ridge portion, and the main body portion may be formed by extrusion molding in which the direction in which the hollow portion extends is the extrusion direction.

[0009] According to the above-described configuration, the main body is formed by extrusion molding, and therefore can be easily manufactured.

[0010] The second direction may be a direction along an extrusion direction in the extrusion molding.

[0011] According to the above configuration, since the second direction in which the convex rib portion extends is the direction along the extrusion direction, it is only necessary to change the shape of the die for manufacturing the main body portion so that the convex rib portion is formed, and the main body portion having the convex rib portion formed thereon can be easily manufactured.

[0012] The heat collecting device may further include a transparent plate that suppresses heat radiation from the heat collecting member, and the transparent plate may be disposed so as to cover the heat collecting member.

[0013] According to the above configuration, because the transparent plate covers the heat collecting member, the air heated by sunlight is trapped around the heat collecting member by the transparent plate, and the heat of the surrounding heated air (hereinafter referred to as warm air) moves by convection to the contact surface of the heat collecting member with the air, and is transferred (heat transferred) through thermal conduction inside the heat collecting member to the heat medium flowing through the hollow portion. The warm air in the space surrounded by the transparent plate has heat removed (cooled) by the heat collecting member, and the vertical downward flow of the cooled air is accelerated. As a result, the air in the space surrounded by the transparent plate circulates, lowering the temperature of the air in the lower part of the space (cooling the air).

[0014] The transparent plate may be a light-transmitting member.

[0015] According to the above configuration, the transparent plate is a translucent material that can transmit visible light from sunlight, so the sunlight irradiated onto the heat collecting member is not blocked by the transparent plate, and the amount of solar radiation that can be received by the heat collecting member can be ensured while trapping the warm air within the space surrounded by the transparent plate.

[0016] The heat collecting member may include a high emissivity portion on a surface of the heat collecting member that has a relatively high emissivity for wavelengths in the wavelength range of sunlight.

[0017] The high emissivity portion may further have a relatively low emissivity for wavelengths greater than the wavelength range of sunlight.

[0018] According to the above-mentioned configuration, since the high emissivity portion is of the selective absorption type, it is possible to improve the efficiency of collecting solar heat. [Effects of the Invention]

[0019] According to the structure of the present invention, the solar heat collection efficiency can be improved. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 2 is an exploded perspective view of the heat collecting member according to the first embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of a main body according to the first embodiment of the present invention. [Figure 3A] FIG. 10 is a side view schematically showing the flow of air around a heat collecting member in a comparative example of the present invention. [Figure 3B] FIG. 10 is a perspective view schematically showing the flow of air around a heat collecting member in a comparative example of the present invention. [Figure 3C] FIG. 3 is a diagram schematically showing the flow of air around the heat collecting member in the first embodiment of the present invention. [Figure 4] 1 is a schematic perspective view of an agricultural greenhouse according to a first embodiment of the present invention. [Figure 5] FIG. 1 is a configuration diagram of an agricultural greenhouse according to a first embodiment of the present invention. [Figure 6] FIG. 10 is a plan view showing a first modified example of the main body of the present invention. [Figure 7] FIG. 10 is a front view showing a second modified example of the main body of the present invention. [Figure 8] FIG. 10 is a front view showing a third modified example of the main body of the present invention. [Figure 9] FIG. 10 is a front view showing a fourth modified example of the main body of the present invention. [Figure 10] FIG. 10 is a front view showing a fifth modified example of the main body of the present invention. [Figure 11A] 1 is a perspective view of a main body of a heat collecting member used as a joint beam according to a first embodiment of the present invention. FIG. [Figure 11B] FIG. 10 is a front view of a main body according to a first modified example of a heat collecting member used as a joint beam according to the first embodiment of the present invention. [Figure 11C] FIG. 10 is a front view of a main body according to a second modified example of a heat collecting member used as a joint beam according to the first embodiment of the present invention. [Figure 12] FIG. 4 is a configuration diagram showing a modified example of the agricultural greenhouse according to the first embodiment of the present invention. [Figure 13] FIG. 10 is a diagram showing a building having vertical members as frames arranged on the outside of walls according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] (First embodiment) First, the configuration of the heat collecting member 10 according to this embodiment will be described with reference to Figures 1 and 2. The Z direction shown in Figure 1 is the direction along the vertical direction in which gravity acts, the direction perpendicular to the Z direction is the X direction, and the direction perpendicular to the Z direction and the X direction is the Y direction.

[0022] The heat collecting member 10 is configured to allow a heat medium to flow through the inside. The heat medium is, for example, water. However, the heat medium is not limited to water and may be an antifreeze solution containing ethylene glycol as a main component, or the like.

[0023] As shown in FIG. 1, the heat collecting member 10 has two cover portions 1 and a main body portion 2.

[0024] The lid 1 is a rectangular parallelepiped member formed by cutting an aluminum alloy rectangular parallelepiped or welding aluminum alloy plates. Note that the lid 1 may be made of metals other than aluminum alloys, such as steel, aluminum, copper, copper alloys, or non-metals such as resin or rubber.

[0025] The configuration of the lid part 1 can be changed as appropriate depending on the flow of the heat medium through the main body part 2, but in this embodiment, an inlet 1a is formed in one of the two lid parts 1, and an outlet 1b is formed in the other lid part 1. Furthermore, each of the two lid parts 1 has a communication space 1s that communicates with the heat medium flow path 22s of the main body part 2. The lid part 1 is fixed to the main body part 2 by any fixing method, for example, welding or adhesive.

[0026] The main body 2 is cylindrical with both ends 2a and 2b open. The main body 2 is an elongated member with the longitudinal direction extending from one end 2a to the other end 2b. The main body 2 is formed by extrusion molding of an aluminum alloy (an example of a metal containing aluminum). In other words, the longitudinal direction of the main body 2 is the direction along the extrusion direction in the extrusion molding.

[0027] The main body 2 may be made of a metal other than aluminum alloy, such as iron or copper. The thermal conductivity of the main body 2 is preferably 200 w / m·K or higher. By using an aluminum alloy for the main body 2, the workability, corrosion resistance, and thermal conductivity of the heat collecting member 10 can be improved. The heat medium is preferably neutral to weakly alkaline with a pH of 6 to 11 to suppress corrosion of the aluminum alloy.

[0028] The main body 2 has a wall 21 and a hollow portion 22 formed inside the wall 21. Each of the wall 21 and the hollow portion 22 extends in the longitudinal direction (the direction along the extrusion direction in extrusion molding). The cross section (hereinafter referred to as the transverse cross section) of the main body 2 perpendicular to the longitudinal direction is constant (including being substantially constant), and in this embodiment, is rectangular.

[0029] The hollow portion 22 has an opening 2h that extends continuously along the longitudinal direction and two partition walls 22g that partition the opening 2h. The opening 2h is partitioned by the two partition walls 22g into three spaces through which a heat medium can flow. Hereinafter, each of the three spaces through which a heat medium can flow is referred to as a heat medium flow path 22s. In this embodiment, the heat medium flows in the same direction through the three heat medium flow paths 22s. However, the heat medium may flow in opposite directions between adjacent heat medium flow paths 22s.

[0030] 2, the wall portion 21 has four outer surfaces 21g, and the outer surfaces 21g include an outer surface 21g intended to be a light-receiving surface capable of receiving sunlight. Hereinafter, the outer surface 21g intended to be a light-receiving surface will be referred to as a light-receiving surface 21j.

[0031] At the outer surface 21g, heat is exchanged between the main body 2 and the surrounding air. For example, if the temperature of the outer surface 21g of the heat collecting member 10 is lower than the temperature of the air, the air in contact with the outer surface 21g loses heat to the outer surface 21g, causing the temperature to drop. When the temperature of the air drops, the volume of the air decreases and the density increases, so that heat exchange between the air and the heat collecting member 10 causes the air to flow from above to below along the heat collecting member 10 (natural convection that includes a vertically downward component occurs).

[0032] As shown in FIGS. 1 and 2, the main body 2 further has three ridge portions 23 that protrude in a protruding direction D1 (an example of a first direction). The ridge portions 23 are formed integrally with the main body 2 and facing outward on the surface of the main body 2. In this embodiment, the ridge portions 23 are formed on the light receiving surface 21j. The three ridge portions 23 are formed at a constant spacing M along the short side direction that is perpendicular to the long side direction of the main body 2. In this embodiment, the spacing M between the three ridge portions 23 is constant, but the spacing M does not have to be constant, and the number of ridge portions 23 is not limited to three.

[0033] 1, the ridge portions 23 extend in an extension direction D2 (an example of a second direction) perpendicular to the protrusion direction. In this embodiment, the extension direction D2 is a direction along the extrusion direction in extrusion molding, and the heat collecting member 10 is applied to a structure in which the extension direction D2 of the ridge portions 23 is arranged so as to include a vertical component along the vertical direction (Z direction).

[0034] 3A and 3B, in a heat collecting member 10 according to a comparative example, in which the extension direction D92 of the ridge portions 93 does not include a vertical component, i.e., is horizontal, the flow of air (warm air) around the heat collecting member 10 is obstructed by the ridge portions 93. This causes air to stagnate between adjacent ridge portions 93. Specifically, the upper surfaces (upper surfaces in the vertical direction) of the ridge portions 93 located vertically below the adjacent ridge portions 93 obstruct the downward movement of air, inhibiting natural convection. Note that FIG. 3A is a view of the heat collecting member 10 shown in FIG. 3B as viewed from the X direction.

[0035] On the other hand, as shown in Figure 3C, in a heat collecting member 10 in which the extension direction D2 of the convex rib portion 23 is arranged in an attitude that includes a vertical component, the air (warm air) flows smoothly downward along the outer surface 21g (light receiving surface 21j) without being obstructed by the convex rib portion 23, and obstruction of natural convection by the convex rib portion 23 is avoided.

[0036] The heat collecting member 10 of this embodiment has the ridges 23 protruding in the protruding direction D1. This increases the surface area of ​​the heat collecting member 10 and the contact area with the air compared to a configuration without the ridges 23. Furthermore, the air surrounding the heat collecting member 10 loses heat at the contact surface with the heat collecting member 10 (the heat collecting member acquires heat from the air), causing the temperature to drop and the density to increase. This generates natural convection, which moves vertically downward, which is the direction of gravity. According to this embodiment, the extension direction D2 of the ridges 23 is arranged to include a vertical component. As described with reference to FIG. 3C , the air around the heat collecting member 10, particularly the light-receiving surface 21j of the main body 2, can flow smoothly along the light-receiving surface 21j. This prevents the air from being prevented from separating from the heat collecting member 10 after heat exchange with the heat collecting member 10. Furthermore, natural convection is promoted, which is expected to increase the amount of heat transfer between the air and the heat medium via the heat collecting member 10. 3A and 3B, if the extending direction D2 of the ridges 23 does not include a vertical component, the ridges 23 will hinder natural convection, reducing the amount of heat transferred to the surface of the heat collecting member 10 on which the ridges 23 are provided. Therefore, the amount of convection heat transfer will not increase due to an increase in the contact area between the heat collecting member 10 and the air caused by providing the ridges 23, and the heat collection efficiency will not improve.

[0037] Furthermore, the main body 2 can be easily manufactured by extrusion molding. Furthermore, since there is no need for processing such as joining or cutting to form the ridges 23, manufacturing costs can be reduced.

[0038] Furthermore, since the extension direction D2 is along the extrusion direction, it is only necessary to change the shape of the die for manufacturing the main body portion 2 so that the convex rib portion 23 is formed, and the main body portion 2 having the convex rib portion 23 formed thereon can be easily manufactured.

[0039] An agricultural house 100, which is an example of a structure to which the heat collecting member 10 is applied, will be described below with reference to Fig. 4. In the first embodiment, the heat collecting member 10 applied to the agricultural house 100 is arranged so that the convex strip portion 23 includes a vertical component, and the agricultural house 100 is assembled.

[0040] The agricultural greenhouse 100 is installed on horizontal ground GL so that the installation area is rectangular. In the following description, the horizontal direction of the shorter side of the agricultural greenhouse 100 is defined as the X direction, the longer side of the agricultural greenhouse 100 is defined as the Y direction, and the direction perpendicular to the X and Y directions is defined as the Z direction.

[0041] The agricultural greenhouse 100 includes a heat collecting member 10 capable of collecting solar heat and a transparent plate 20 that suppresses heat radiation from the heat collecting member 10, and has an internal cultivation space that provides an environment suitable for cultivating agricultural crops.

[0042] The heat collecting member 10 is used as at least one of a pillar 10a extending from the ground GL in the Z direction, a first beam 10b extending in the X direction, a second beam 10c extending in the Y direction, and a gable beam 10d consisting of two members extending diagonally. The pillar 10a, the first beam 10b, the second beam 10c, and the gable beam 10d are each essential members for maintaining the structure of the agricultural greenhouse 100, and have rigidity sufficient to withstand the weight of the agricultural greenhouse 100 and external loads such as wind.

[0043] The agricultural greenhouse 100 is composed of a plurality of pillars 10a, a plurality of first beams 10b, a plurality of second beams 10c, and a plurality of gable beams 10d. In the example shown in FIG. 4, the plurality of pillars 10a include three pairs of pillars 10a facing each other in the X direction. The plurality of first beams 10b include three first beams 10b arranged at a fixed interval in the Y direction. The plurality of second beams 10c include two pairs of second beams 10c facing each other in the X direction and one second beam 10c arranged between the pair of second beams 10c. The plurality of gable beams 10d include three pairs of gable beams 10d that approach each other in the Z direction.

[0044] The three sets of pillars 10a are arranged at regular intervals in the Y direction. The two sets of second beams 10c are arranged at regular intervals in the Z direction. The three sets of gabled beams 10d are arranged at regular intervals in the Y direction (the same intervals as between two adjacent sets of pillars 10a). The first beams 10b and the second beams 10c are connected to at least one of the pillars 10a and the gabled beams 10d by connecting members (not shown), and the gabled beams 10d are connected to at least one of the pillars 10a, the first beams 10b, and the second beams 10c by connecting members (not shown).

[0045] In this embodiment, the heat collecting member 10 is used as one set of pillars 10a that is closest to the -Y side among the three sets of pillars 10a.

[0046] The heat collecting member 10 is disposed so as to be irradiated with sunlight. As a result, heat (thermal energy) based on the irradiated sunlight (light energy), i.e., solar heat, is transferred to the heat medium flowing inside the heat collecting member 10, causing the temperature of the heat medium to rise.

[0047] The transparent plate 20 is arranged to cover the heat collecting member 10 and prevents direct contact between the air inside and outside the agricultural greenhouse, thereby suppressing the dissipation of heat collected by the heat collecting member 10 and the ground due to solar radiation to the outside of the agricultural greenhouse. In this embodiment, the transparent plate 20 is arranged to cover all of the pillars that make up the agricultural greenhouse 100. More specifically, the transparent plate 20 is arranged to cover the pillars 10a, first beams 10b, second beams 10c, and gable beams 10d that are used as the heat collecting member 10.

[0048] The transparent plate 20 is a light-transmitting plate (surface material) that is a member that can transmit sunlight. In this embodiment, the transparent plate 20 is made of light-transmitting glass, hard plastic, or vinyl sheet.

[0049] As shown in FIG. 5, the agricultural greenhouse 100 further includes a heat medium circulating unit 30 that circulates the heat medium flowing inside the heat collecting member 10.

[0050] The heat medium circulation unit 30 includes a tank 31 for storing the heat medium, piping 32 through which the heat medium flows, a pump 33 for transporting the heat medium, a valve 34 for controlling the flow of the heat medium, a radiator 35 for exchanging heat between the heat medium and air, and a control unit 36 ​​for controlling the operation of the valve 34.

[0051] The piping 32 is connected to the heat collecting member 10, and the tank 31, the pump 33, the valve 34, and the radiator 35 are connected via the piping 32. In the example shown in FIG. 5, the piping 32 is connected to each of two pillars 10a facing each other in the X direction. The heat medium that flows into the pillars 10a via the piping 32 flows through the pillars 10a (pillar 10a on the -X side), the first beam 10b, the second beam 10c or the gable beam 10d, and the pillars 10a (pillar 10a on the +X side) in this order, and returns to the piping 32. In FIG. 5, the flow path through which the heat medium flows is conceptually indicated by the arrow R.

[0052] In this embodiment, the valve 34 is a three-way valve such as a rotary valve, and is configured to be switchable between a first position and a second position. The valve 34 is controlled by the control unit 36 ​​to be in the first position during the day when sunlight hits the heat collecting member 10, and to be in the second position at night when sunlight does not hit the heat collecting member 10.

[0053] When the valve 34 is in the first position, the heat medium flows through the pipe 32 to the heat collecting member 10, flows inside the heat collecting member 10, and then returns to the tank 31. On the other hand, when the valve 34 is in the second position, the heat medium flows through the pipe 32 to the radiator 35, exchanges heat with the air in the radiator 35, and then returns to the tank 31. As a result, for example, the heat medium heated by solar heat during the day exchanges heat with the air inside the agricultural greenhouse 100 at night. As a result, the temperature inside the agricultural greenhouse 100 can be increased at night. The radiator 35 is a pipe or the like disposed above the ground of the agricultural greenhouse 100.

[0054] As described above, in the first embodiment, the extension direction D2 of the convex strip portion 23 of the heat collection member 10 in the agricultural greenhouse 100 is arranged so as to include a vertical component, so that an increase in the amount of heat transfer (the sum of the amount of radiative heat transfer and the amount of convective heat transfer) between the air and the heat medium via the heat collection member 10 can be expected, and the efficiency of collecting heat from sunlight can be improved.

[0055] Furthermore, because the transparent plate 20 covers the heat collecting member 10, the transparent plate 20 can confine the air heated by sunlight around the heat collecting member 10. The heat of the surrounding heated air (hereinafter referred to as warm air) is transferred to the heat medium flowing through the hollow portion 22 via the contact surface between the heat collecting member 10 and the air by convection. The heat collecting member 10 has the ridges 23, which increases the contact area between the warm air and the heat collecting member 10, so that more heat from the warm air is transferred to the heat medium than in a configuration without the ridges 23. At the same time, the air (warm air) loses heat at the contact surface with the heat collecting member (the heat collecting member 10 gains heat from the air), causing its temperature to drop and its density to increase, resulting in vertically downward natural convection. Here, as described above, because the extension direction D2 of the ridges 23 includes a vertical component, the air can flow smoothly along the outer surface of the wall portion 21 of the heat collecting member 10. That is, the heat of the warm air in the space surrounded by the transparent plates 20 is removed (cooled) by the heat collecting member 10, and the vertical downward flow of the cooled air is accelerated. As a result, the air in the space surrounded by the transparent plates 20 circulates, and the temperature of the air in the lower part of the space can be lowered (the air can be cooled).

[0056] In other words, the heat collecting member 10 can maximize the amount of heat collected by convection heat transfer from the warmed air inside the agricultural greenhouse 100.

[0057] Furthermore, because the transparent plate 20 is a member that transmits sunlight (for example, is transparent), the sunlight irradiating the heat collecting member 10 is not blocked by the transparent plate 20. In other words, the amount of solar radiation in the agricultural greenhouse 100 can be secured. At the same time, the transparent plate 20 can prevent air heated by sunlight from dissipating to the outside of the agricultural greenhouse 100, so that a growth environment such as temperature suitable for the crops (plants) produced in the agricultural greenhouse 100 can be established, and the growth rate of the crops can be improved.

[0058] (Modification of the first embodiment) As shown in FIG. 6 , the heat collecting member 10 may further include a high emissivity portion 24 (emissivity adjusting portion 24) having a high emissivity. The high emissivity portion 24 is provided to improve the amount of radiant heat transfer that absorbs and receives solar radiation. The high emissivity portion 24 may be formed by applying, for example, black paint with a high emissivity. Alternatively, the high emissivity portion 24 may be formed on the surface of the heat collecting member 10 as a selective absorption high emissivity portion 24 by surface treatment such as black anodizing, black chrome plating, or black nickel plating. In this embodiment, the surface of the heat collecting member 10 includes the outer surface 21g of the wall portion 21 and the outer surface 23g of the ridge portion 23. However, the high emissivity portion 24 may be provided on the entire surface of the main body 2, or only on the outer surface 21g including at least the light receiving surface 21j, or only on the outer surface 23g of the ridge portion 23.

[0059] Alternatively, the high emissivity portion 24 may be formed with a selective absorption coating (selective absorption type coating). In this case, the high emissivity portion 24 has a relatively high emissivity for wavelengths within the solar wavelength range and a relatively low emissivity for wavelengths (0.78 μm) (infrared) longer than the solar wavelength range, so that heat rays (electromagnetic waves) are not emitted from the heat collecting member. This suppresses the dissipation of heat collected by the heat collecting member 10. As a result, the solar heat collection efficiency can be improved. Furthermore, both the radiant heat obtained by receiving solar light at the high emissivity portion 24 and the convective heat from the surrounding warm air increase, improving the combined solar heat collection efficiency.

[0060] Furthermore, although the case where the extension direction D2 of the ridge portions 23 is parallel to the extrusion direction of the main body portion 2 has been described, the extension direction D2 of the ridge portions 23 may be arranged so as to include a vertical component. For example, as shown in FIG. 7, the extension direction D2 of the ridge portions 23 may intersect with the direction along the extrusion direction of the main body portion 2. More specifically, as shown in FIG. 7, the extension direction D2 of the ridge portions 23 may be a direction along the short side direction of the main body portion 2. Alternatively, as shown in FIG. 8, the extension direction D2 of the ridge portions 23 may be inclined at an inclination angle α with respect to the short side direction of the main body portion 2. Alternatively, as shown in FIG. 9, the extension direction D2 of the ridge portions 23 may be inclined at an inclination angle α with respect to the longitudinal direction of the main body portion 2. The inclination angle α is greater than 0 degrees and equal to or less than 90 degrees.

[0061] 7 to 9, the main body 2 may be formed by a forming method other than extrusion (extrusion processing), such as roll forming or casting. When the main body 2 is formed by roll forming, the convex rib portion 23 may be joined (fixed) to the main body 2 by welding or the like.

[0062] In addition, in the above embodiment, a configuration in which three convex rib portions 23 are formed on one outer surface 21g is described, but the number of convex rib portions 23 formed on one outer surface 21g can be changed as appropriate and may be one, two, four or more.

[0063] In the above embodiment, a case has been described in which a plurality of (three in the first embodiment) ridge portions 23 are formed on only one outer surface 21g (light-receiving surface 21j) of the main body portion 2, but as shown in Fig. 10, a plurality of ridge portions 23 may be formed on two or more outer surfaces 21g. In the example shown in Fig. 10, a configuration in which a plurality of ridge portions 23 are formed on two opposing outer surfaces 21g is illustrated, but the surfaces on which the plurality of ridge portions 23 are formed are arbitrary and may be, for example, two adjacent surfaces.

[0064] In the above embodiment, the case where three heat medium passages 22s are formed in the hollow portion 22 has been described, but the number of heat medium passages 22s formed in the hollow portion 22 is not limited to three and may be one, as shown in Fig. 10. In this case, the partition wall 22g is omitted. Also, the number of partition walls 22g may be one or three or more, and the number of heat medium passages 22s may be a number other than three.

[0065] In the above embodiment, the cross-sections of the wall portion 21 and the hollow portion 22 are rectangular, but the cross-sectional shapes of the wall portion 21 and the hollow portion 22 can be changed as appropriate, such as to an oval or a circle.

[0066] In the above embodiment, a case was described in which the first direction (the protruding direction D1 of the convex rib portion 23) and the second direction (the extending direction D2 of the convex rib portion 23) are perpendicular to each other, but the first direction and the second direction only need to intersect, and are not limited to a case in which the first direction and the second direction are perpendicular to each other.

[0067] In the above embodiment, the main body 2 and the lid 1 are separate bodies, but the main body 2 and the lid 1 may be integrally formed.

[0068] In the above embodiment, the heat collecting member 10 is used as a pillar 10a, but the heat collecting member 10 may be used as at least one of the first beam 10b, the second beam 10c, and the gable beam 10d described with reference to Fig. 4. When the heat collecting member 10 is used as at least one of the first beam 10b, the second beam 10c, and the gable beam 10d, the extension direction D2 of the convex rib portion 23 is formed to include a vertical component DV (see Fig. 7 and Figs. 11A to 11C).

[0069] 11A to 11C, the convex rib portion 23 can be arranged on various surfaces of the gable beam 10d as long as the extension direction D2 of the convex rib portion 23 includes a vertical component DV (see FIGS. 11A and 11C). As shown in FIG. 11B, the convex rib portion 23 may be inclined at an inclination angle α with respect to the longitudinal direction of the heat collecting member 10 used as the gable beam 10d, or as shown in FIG. 11C, it may be provided along the longitudinal direction of the heat collecting member 10. Note that the number of pillars 10a, first beams 10b, second beams 10c, and heat collecting members 10 used as the gable beams 10d can be changed as appropriate.

[0070] The heat collecting member 10 may be applied to pillars other than the pillars 10a, first beams 10b, second beams 10c, and gable beams 10d described with reference to Fig. 4. For example, as shown in Fig. 12, the agricultural greenhouse 100 may further include diagonal pillars 10z extending diagonally between pillars 10a facing each other in the Y direction, and the heat collecting member 10 may be applied to the pillars 10z. The extension direction D2 of the convex strip portions 23 in the pillars 10z, when broken down, includes at least a vertical component DV, and in the example shown in Fig. 12, includes a horizontal component DH and a vertical component DV.

[0071] In the above embodiment, the agricultural greenhouse 100 is installed on a horizontal ground surface GL. However, the agricultural greenhouse 100 may be installed on a non-horizontal ground surface GL, such as an uneven ground surface GL or an inclined ground surface GL, as long as the extending direction D2 of the convex ridge portion 23 includes a vertical component.

[0072] In the above embodiment, the shape of the installation area of ​​the agricultural greenhouse 100 is rectangular, but the shape of the installation area of ​​the agricultural greenhouse 100 is not particularly limited and can be changed as appropriate to a square, oval, circle, etc.

[0073] (Second embodiment) 13, the heat collecting member 10 according to the second embodiment differs from the first embodiment in that it is applied to a frame W (at least one of a vertical member and a horizontal member) attached to the outside of the outer wall of a structure 101 such as a building or an apartment building. Since the other configurations are the same as those of the first embodiment, the same reference numerals are used to designate the same or similar configurations as those of the first embodiment, and detailed descriptions thereof will be omitted.

[0074] In the second embodiment, the heat collecting member 10 applied as the frame W (first frame 10e described later) is assembled on the outside of the wall of the building 101 with the convex strip portion 23 arranged so as to include a vertical component.

[0075] In the example shown in FIG. 13, the building 101 includes a plurality (three) of first frame bodies 10e (vertical members) extending in the Z direction from the ground GL, at least one second frame body 10f (horizontal member) extending in the X direction and connected to each of the plurality of first frame bodies 10e, and a plurality (two) of transparent plates 20. The transparent plates 20 are disposed and fixed to each of the plurality of first frame bodies 10e and each of the plurality of second frame bodies 10f. The transparent plates 20 are disposed on the outer surface of the heat collecting member 10. In the example shown in FIG. 13, the second frame body 10f is configured to have a high emissivity by surface treatment such as application of black paint, black anodizing, black chrome plating, or black nickel plating. The angle of the main surface of the second frame body 10f with respect to the horizontal direction may be appropriately set according to the solar noon altitude.

[0076] 13 also includes a heat medium circulating unit 30 that circulates the heat medium flowing inside the heat collecting member 10, similar to the agricultural greenhouse 100, but this is omitted for ease of understanding. The lid 1 of the heat collecting member 10 is also omitted.

[0077] The heat collecting member 10 used as the first frame 10e is arranged so as to be irradiated with sunlight. As a result, heat (thermal energy) based on the irradiated sunlight (light energy), i.e., solar heat, is transferred to the heat medium flowing inside the heat collecting member 10, causing the temperature of the heat medium to rise.

[0078] The transparent plate 20 is arranged to cover the heat collecting member 10, similar to the transparent plate 20 used in the agricultural greenhouse 100 described with reference to Fig. 6. In this embodiment, the transparent plate 20 is made of translucent glass. However, the transparent plate 20 may also be made of a translucent vinyl sheet.

[0079] As described above, in the heat collecting member 10 according to the second embodiment, the frame body W is also arranged so that the extension direction D2 of the convex rib portion 23 of the heat collecting member 10 includes a vertical component, and therefore an increase in the amount of heat transfer (the sum of the amount of radiative heat transfer and the amount of convective heat transfer) between the air and the heat medium via the heat collecting member 10 can be expected, improving the efficiency of collecting heat from sunlight.

[0080] Furthermore, since the transparent plate 20 covers the heat collecting member 10, the heat of the warm air in the space surrounded by the building wall and the transparent plate 20 can be transferred (heat transferred) to the heat medium flowing through the hollow portion 22 of the heat collecting member 10.

[0081] Furthermore, since the transparent plate 20 is a light-transmitting (e.g., transparent) material, the sunlight irradiating the heat collecting member 10 is not blocked by the transparent plate 20, and the amount of light that can be received by the frame body W provided on the outside of the wall of the building 101 can be ensured.

[0082] (Variation) In the above embodiment, as shown in Figs. 4 and 13, the transparent plate 20 is disposed facing at least one surface of the heat collecting member 10 (a surface including at least one outer surface 21g of the main body 2). One transparent plate 20 may be disposed facing all surfaces of one heat collecting member 10. Furthermore, one transparent plate 20 may cover multiple heat collecting members 10 (see Figs. 4 and 13), or one heat collecting member 10 may be covered by multiple (for example, two adjacent) transparent plates 20. The transparent plate 20 may be a light-transmitting member capable of preventing diffusion of light-transmitting heat.

[0083] As described above, the heat collecting member 10 may be used as at least one of the pillars 10a, first beams 10b (beams), second beams 10c (beams), gable beams 10d, first frame bodies 10e, and second frame bodies 10f that make up the structures (agricultural greenhouse 100 and building 101). In other words, the heat collecting member 10 may be used as any of the pillars 10a, first beams 10b (beams), second beams 10c (beams), gable beams 10d, first frame bodies 10e, and second frame bodies 10f.

[0084] While specific embodiments of the present invention and their modifications have been described above, the present invention is not limited to the above-described embodiments and can be implemented with various modifications within the scope of the present invention. For example, an appropriate combination of the contents of the above-described embodiments may be an embodiment of the present invention. [Explanation of symbols]

[0085] 2 Main body 10 Heat collecting member 20 Transparent plate 21 Wall 22 Hollow part 23 Convex portion 24 High emissivity section 100 Agricultural House (Structure) 101 Building (Structure)

Claims

1. A heat collecting member capable of collecting heat generated by sunlight is provided, The heat collecting member is The wall portion and a hollow portion formed inside the wall portion and through which a heat medium for transferring heat generated by sunlight can flow; a protruding ridge portion protruding in a first direction from an outer surface of the wall portion; and The convex ridge portion extends in a second direction intersecting the first direction, The second direction includes a vertical component along a vertical direction in which gravity acts.

2. the heat collecting member further includes a main body portion having the wall portion, the hollow portion, and the ridge portion; The structure according to claim 1 , wherein the main body is formed by extrusion molding, with the extension direction of the hollow portion being the extrusion direction.

3. The structure according to claim 2 , wherein the second direction is a direction along an extrusion direction in the extrusion molding.

4. Further provided is a transparent plate for suppressing heat radiation from the heat collecting member, The structure according to claim 1 , wherein the transparent plate is disposed so as to cover the heat collecting member.

5. The structure according to claim 4 , wherein the transparent plate is a light-transmitting member.

6. The structure according to claim 1 , wherein the heat collecting member further comprises a high emissivity portion on a surface of the heat collecting member, the high emissivity portion having a relatively high emissivity for wavelengths in the wavelength range of the sunlight.

7. The structure according to claim 6 , wherein the high emissivity portion further has a relatively low emissivity for wavelengths greater than the wavelength range of the sunlight.

Images