JP2014085051A - Sun light collecting mirror and sun light heat collecting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sun light collecting mirror and a sun light heat collecting system having a light weight and simple configuration, of which manufacturing is easy and its transportation and assembling work or maintenance for replacement etc. can be easily carried out.SOLUTION: In the case that a reflection mirror 10 is assembled, both edges of the reflection mirror 10 are fitted into a clearance of rails 42 and pushed at the end portions while its reflection surface is being faced inwardly, and the reflection mirror 10 can be fitted to a frame 41. Since the reflection mirror 10 is light in weight, a worker can hold it with hands and push it into the frame and so an operation vehicle such as a crane and the like is not necessary and the number of assembling steps is substantially decreased. In this case, a wall part 11a of a hollow layer structure 11 is positioned in substantial parallel relation with an axial direction of a receiver 70. Accordingly, the reflection mirror 10 is easily curved along a parabolic line or an arcuate shape of the frame 41 and it shows a high accurate reflection surface shape to enable a sufficient light collecting characteristic to be assured. In turn, since the reflection mirror 10 shows a high rigidity in an axial direction of the receiver 70, it is not dropped from the rails 42 even if strong wind blows against it.

Description

  The present invention relates to a solar light collecting mirror and a solar heat collecting system, and more particularly to a solar light collecting mirror and a solar heat collecting system suitable for a trough-type support structure.

  In recent years, utilization of natural energy has been studied as an alternative energy to fossil fuel energy such as oil and natural gas. Among them, solar energy, which is the most stable alternative energy for fossil fuels and has a large amount of energy, is attracting attention.

  However, although solar energy is a very powerful alternative energy, from the viewpoint of utilizing this, (1) the energy density of solar energy is low, and (2) it is difficult to store and transfer solar energy. However, this is considered a problem.

  At present, research and development of solar cells are actively performed, and the use efficiency of solar light is increasing. However, it is difficult to say that the recovery efficiency is still high.

  On the other hand, as another method for converting sunlight into energy, a so-called solar heat collecting system that reflects and collects sunlight with a mirror and generates electric power using the obtained heat as a medium has attracted attention. Using this method, it is possible to generate electricity regardless of day and night by storing the obtained heat, and from a long-term perspective, it is considered that the power generation efficiency is higher than that of solar cells. It can be said that it can be used effectively. In the solar heat collection system, a large number of mirrors are installed around the tower, and the sunlight reflected from the mirrors is collected on the heat collection part at the top of the tower, and the power is generated with the heat. There is a trough type that concentrates sunlight reflected from the curved mirror on the pipe installed at the focal position of the curved mirror installed in a shape, heats the liquid (oil etc.) flowing in the pipe, and generates electricity with the heat . In the case of a trough-type solar heat collecting system, it is assumed that a curved mirror is used.

  Currently, glass mirrors using glass as a base material are widely used as mirrors used in solar heat collecting systems. Here, the curved mirror for the trough-type solar heat collecting system is formed by, for example, gradually bending a flat glass mirror against a concrete support having a curved surface as shown in Patent Document 1 so as not to break. Thus, the curved mirror is formed in the attached state, but the installation process takes time and costs are increased. In addition, since the glass itself is quite heavy, a heavy machine such as a crane is required to install or replace the glass mirror in the field, and there is a problem that more labor is required.

JP 58-14105 A U.S. Pat. No. 8,039,777

  On the other hand, Patent Document 2 discloses that a metal panel using SUS, aluminum, or the like is applied to a reflection mirror. However, a metal panel using SUS, aluminum, or the like is also expensive to manufacture and has a problem that installation and replacement are troublesome because it is heavy like a glass mirror.

  SUMMARY OF THE INVENTION An object of the present invention is a light-collecting mirror that is light and simple in configuration, easy to manufacture, and easy to perform maintenance such as transportation, assembly work, and replacement, and a solar heat collecting system using the same. Is to provide.

  The solar light collecting mirror according to claim 1 is a hollow laminated structure including a plurality of wall portions extending along a predetermined direction and a pair of plates abutting against both side edges of the plurality of wall portions. The film surface is provided with a film mirror.

  According to this invention, weight reduction can be achieved by using a film mirror instead of a glass mirror. However, since a film mirror has low rigidity, it cannot maintain a fixed shape by itself. Therefore, in the present invention, a hollow laminated structure is adopted to support the film mirror. As a result, it is possible to promote weight reduction while securing a highly accurate shape of the solar light collecting mirror, so that it is possible to reduce the trouble of installation and replacement. Moreover, since the said hollow laminated structure is equipped with the some wall part extended along a predetermined direction, and a pair of board which contact | abuts the both-sides edge of the said several wall part, the direction which the said wall part approaches It is easy to bend, whereby a predetermined curved surface shape can be obtained, the sunlight collecting efficiency can be increased, and the rigidity of the wall portion in the surface direction is high, so that the film mirror shape can be maintained. Here, the “wall portion” refers to a portion that connects between a pair of plates. For example, in the case of a hollow laminated structure that is sandwiched between a pair of plates in a state where a single plate material is repeatedly bent into a wave shape, A portion of the plate material leading to the other plate is referred to as a wall portion. Therefore, the plurality of wall portions may be parallel as long as they extend along a predetermined direction, or may be inclined with respect to each other.

  The solar light collecting mirror according to claim 2 is the invention according to claim 1, wherein the hollow laminated structure is attached to a trough-type support structure, and the plurality of wall portions are connected to the pair of plates. It is characterized in that imaginary planes extending to one side are bent so as to cross each other.

  The hollow laminated structure includes a plurality of wall portions extending along a predetermined direction and a pair of plates abutting against both side edges of the plurality of wall portions. In particular, the present invention is applied to a trough-type solar heat collecting system because it has a characteristic that it is easy to bend so that virtual planes extending to one side of the plates intersect each other and high in a direction different from the bending direction. It is preferable to use a solar light collecting mirror.

  The solar light collecting mirror according to claim 3 is the invention according to claim 1 or 2, wherein the hollow laminated structure is made of plastic or metal.

  By forming the hollow laminated structure with plastic, it is possible to provide a structure that can be reduced in weight, can be easily processed, has excellent weather resistance, and is stable for a long period of time. On the other hand, weather resistance superior to plastic can be realized by forming the hollow laminated structure from plastic. Note that by reducing the thickness of the wall and plate, the workability and weight can be brought to a level that is not problematic for practical use.

  The solar light collecting mirror according to claim 4 is the invention according to any one of claims 1 to 3, wherein the hollow laminated structure plate provided with at least the film mirror contains conductive fine particles. It is characterized by.

  For example, when installing a thermal power generation system for Daegu in a desert or the like, dust or the like may adhere to the solar light collecting mirror, leading to a reduction in light collecting efficiency. On the other hand, when conductive fine particles are contained in the plate having the hollow laminated structure provided with at least the film mirror, it is possible to suppress the electric resistance of the film mirror and suppress the adhesion of dust and the like.

  The solar light collecting mirror according to claim 5 is the invention according to claim 4, wherein the fine particles are carbon black having a concentration of 5 to 50 wt%.

A solar heat collecting system having a trough-type support structure according to claim 6,
It has at least 1 heat collection part and the mirror for sunlight condensing in any one of Claims 1-5, The said mirror for sunlight condensing reflects sunlight in the said heat collection part. Irradiating.

[Film mirror]
The film mirror of this invention is demonstrated. “Film mirror” refers to a film-like mirror in which a reflective layer is provided on a film-like resin substrate. The thickness of the film is 50 to 400 μm, preferably 70 to 250 μm, and particularly preferably 100 to 220 μm. It is preferable to set the thickness to 50 μm or more because when the film mirror is attached to the structure, it is easy to obtain good regular reflectance without bending the mirror. Moreover, since it becomes easy to handle by making it 400 micrometers or less, it is preferable.

  The thickness from the surface of the film mirror to the reflective layer is preferably 0.2 mm or less as a solar light collecting mirror used in a trough solar power generation system.

  The film mirror has a flexible support and a photothermal reflection layer provided on at least one surface of the support.

(Flexible support)
There are no particular restrictions on the material that constitutes the flexible support that constitutes the film mirror applicable to the reflector, but in terms of flexibility and weight reduction, for example, polyester, polyethylene terephthalate, polyethylene naphthalate, acrylic Resins such as polycarbonate, polyolefin, cellulose, and polyamide are preferably used. In addition, a glass material can be used as the support as long as it has flexibility.

  “Flexible” in the case of “flexible support” means that it can be bent without being damaged by more than 5 cm when the center part is pushed and bent while supporting both ends of 1.5 m in length. If so, it shall have “flexibility”. However, considering that the film mirror is wound into a roll and transported, a support that can be bent by 10 cm or more is preferably used in the same evaluation, and is not damaged even when wound on a cylindrical member having a diameter of about 50 cm. It is particularly preferable to have the following flexibility.

  Although the thickness of a flexible support body changes with the intensity | strength calculated | required as a film mirror, about 10-125 micrometers is preferable in general.

  The surface of the support may be subjected to corona discharge treatment, plasma treatment or the like in order to improve adhesion with a layer provided on the surface.

  The support preferably contains any one of benzotriazole, benzophenone, triazine, cyanoacrylate, and polymer type ultraviolet absorbers. In particular, when a resin is used as the support material, it is preferable to contain an ultraviolet absorber.

<Ultraviolet absorber>
It is preferable to contain an ultraviolet absorber in the layer between the light incident side surface of the film mirror and the photothermal reflection layer. Furthermore, you may make a support body contain a ultraviolet absorber. As the ultraviolet absorber used for the support, those which are excellent in the ability to absorb ultraviolet rays having a wavelength of 370 nm or less and have little absorption of visible light having a wavelength of 400 nm or more are preferable from the viewpoint of using sunlight.

  Examples of ultraviolet absorbers include oxybenzophenone compounds, benzotriazole compounds, salicylic acid ester compounds, benzophenone compounds, cyanoacrylate compounds, nickel complex salts compounds, triazine compounds, and the like. Compounds, benzotriazole-based compounds and triazine-based compounds with little coloring are preferred. Further, ultraviolet absorbers described in JP-A Nos. 10-182621 and 8-337574, and polymer ultraviolet absorbers described in JP-A Nos. 6-148430 and 2003-113317 may be used.

(Anchor layer)
In the film mirror used in the present invention, an anchor layer may be formed for the purpose of enhancing the adhesion between the support and the photothermal reflection layer.

  The anchor layer is not particularly limited as long as it has a function of improving the adhesion between the photothermal reflection layer and the support, but is preferably made of a resin. Therefore, in the anchor layer, the reflective layer originally has a high adhesiveness for closely adhering the support and the photothermal reflective layer, a high heat resistance that can withstand the heat applied when the photothermal reflective layer is formed by a vacuum deposition method or the like. It is required to have smoothness for drawing out high reflection performance.

  The resin used for the anchor layer is not particularly limited as long as it satisfies the above conditions of adhesion, heat resistance, and smoothness. Polyester resin, acrylic resin, melamine resin, epoxy resin, polyamide resin , Vinyl chloride resins, vinyl chloride vinyl acetate copolymer resins, etc., or a mixture of these resins can be used, and from the viewpoint of weather resistance, a mixed resin of a polyester resin and a melamine resin is preferable, and a curing agent such as isocyanate It is more preferable to use a thermosetting resin in which is mixed. The thickness of the anchor layer is preferably 0.01 to 3 μm, more preferably 0.1 to 1 μm, from the viewpoints of adhesion, smoothness, reflectance of the reflective layer, and the like.

  As a method for forming the anchor layer, a conventionally known wet coating method such as a gravure coating method, a reverse coating method, or a die coating method can be used.

(Photothermal reflection layer)
As the metal constituting the photothermal reflection layer, for example, silver or a silver alloy, gold, copper, aluminum, or an alloy thereof can be used. In particular, silver is preferably used because it shows a high reflectance in the visible light region. Such a photothermal reflective layer serves as a reflective film that reflects light and heat. By making the photothermal reflection layer a film made of silver or a silver alloy, the reflectance of the film mirror from the infrared region to the visible light region can be increased, and the dependency of the reflectance on the incident angle can be reduced. From the infrared region to the visible light region means a wavelength region of 2500 to 400 nm. The incident angle means an angle with respect to a line (normal line) perpendicular to the film surface.

  As a silver alloy, from the point which the durability of a photothermal reflective layer improves, from silver and 1 or more types of other metals chosen from the group which consists of gold | metal | money, palladium, tin, gallium, indium, copper, titanium, and bismuth An alloy is preferred. As the other metal, gold is particularly preferable from the viewpoint of high temperature humidity resistance and reflectance.

  When the photothermal reflection layer is a film made of a silver alloy, 90 to 99.8 atomic percent of silver is preferable in the total (100 atomic percent) of silver and other metals in the reflective layer. Further, the other metal is preferably 0.2 to 10 atomic% from the viewpoint of durability.

  The film thickness of the photothermal reflection layer is preferably 60 to 300 nm, particularly preferably 80 to 200 nm. If the thickness of the reflective layer is less than 60 nm, the film thickness is thin and light is transmitted, so that the reflectance in the visible light region of the film mirror may be reduced. The reflectance increases in proportion to the film thickness up to about 200 nm, but it does not depend on the film thickness above 200 nm. Rather, if the thickness of the photothermal reflection layer exceeds 300 nm, irregularities are likely to occur on the surface of the photothermal reflection layer, which causes light scattering, which may reduce the reflectance in the visible light region.

  Gloss is required for film mirrors, but the method of making and bonding metal foils may cause loss of gloss due to surface irregularities, so in film mirrors that require uniform surface roughness over a wide area range, The photothermal reflection layer is preferably formed by a wet method or a dry method.

  The wet method is a general term for a plating method, and is a method of forming a film by depositing a metal from a solution. Specific examples include silver mirror reaction.

  On the other hand, the dry method is a general term for a vacuum film-forming method. Specific examples include a resistance heating vacuum deposition method, an electron beam heating vacuum deposition method, an ion plating method, and an ion beam assisted vacuum deposition method. And sputtering method. In particular, a vapor deposition method capable of a roll-to-roll method for continuously forming a film is preferably used. That is, it is preferable that the manufacturing method of the film mirror which manufactures the film mirror which concerns on this invention is a manufacturing method of the aspect which has the process of forming the reflective layer which consists of silver by silver vapor deposition.

(Corrosion prevention layer)
In the film mirror used in the present invention, a corrosion prevention layer can be provided adjacent to the side of the photothermal reflection layer that is far from the support. The corrosion-preventing layer contains a corrosion inhibitor and prevents corrosion deterioration of the metal forming the light-heat reflecting layer, for example, silver, and contributes to improving the adhesive force with the adhesive layer formed thereon.

  As a resin that can be used for forming the corrosion prevention layer, a polyester resin, an acrylic resin, a melamine resin, an epoxy resin, etc. can be used alone or a mixed resin thereof. From the viewpoint of weather resistance, a polyester resin, An acrylic resin is preferable, and a thermosetting resin mixed with a curing agent such as isocyanate is more preferable.

  The thickness of the corrosion prevention layer is preferably 0.01 to 3 μm, more preferably 0.1 to 1 μm, from the viewpoints of adhesion, weather resistance, and the like.

  Conventionally known coating methods such as a gravure coating method, a reverse coating method, and a die coating method can be used as the method for forming the corrosion prevention layer.

  As the corrosion inhibitor for the light-heat reflecting layer contained in the corrosion prevention layer, a corrosion inhibitor having an adsorptive group for silver and an antioxidant are preferably used. Here, “corrosion” refers to a phenomenon in which a metal (silver) is chemically or electrochemically eroded or deteriorated by an environmental material surrounding it (see JIS Z0103-2004).

  Moreover, in the film mirror which concerns on this invention, the aspect in which the anchor layer contains antioxidant and the corrosion prevention layer contains the corrosion inhibitor which has an adsorptive group with respect to silver is also preferable.

The content of the corrosion inhibitor, the optimum amount varies depending on compounds used, in general, is preferably in the range of 0.1 to 1.0 g / m ^2.

<Corrosion inhibitor having an adsorptive group for silver>
Corrosion inhibitors having an adsorptive group for applicable silver include amines and derivatives thereof, compounds having a pyrrole ring, compounds having a triazole ring, compounds having a pyrazole ring, compounds having a thiazole ring, and compounds having an imidazole ring It is desirable to be selected from a compound, a compound having an indazole ring, a copper chelate compound, a thiourea, a compound having a mercapto group, a naphthalene-based compound, or a mixture thereof.

<Antioxidant>
An antioxidant can also be used as a corrosion inhibitor for the photothermal reflection layer used in the corrosion prevention layer.

  As the antioxidant, it is preferable to use a phenol-based antioxidant, a thiol-based antioxidant, and a phosphite-based antioxidant.

(Adhesive layer)
In the film mirror used in the present invention, an adhesive layer can be provided for the purpose of fixing the film mirror on the hollow laminated structure.

  The adhesive layer is not particularly limited, and for example, any of a dry laminate agent, a wet laminate agent, an adhesive agent, a heat seal agent, a hot melt agent, and the like is used. For example, polyester resin, urethane resin, polyvinyl acetate resin, acrylic resin, nitrile rubber and the like are used.

  The laminating method is not particularly limited, and for example, it is preferable to carry out the roll method continuously from the viewpoint of economy and productivity.

  The thickness of the pressure-sensitive adhesive layer is usually preferably in the range of about 1 to 50 μm from the viewpoints of the pressure-sensitive adhesive effect, the drying speed, and the like.

  Moreover, the following each layer can also be formed in the film mirror used by this invention as needed.

(Hard coat layer)
Here, a hard coat layer can be provided as the outermost layer of the film mirror. This hard coat layer is provided for the purpose of preventing the film mirror surface from being scratched or contaminated. The thickness of the hard coat layer is preferably 0.05 μm or more and 10 μm or less from the viewpoint of preventing the film mirror from warping while obtaining sufficient scratch resistance. More preferably, they are 1 micrometer or more and 10 micrometers or less. The material for forming the hard coat layer is not particularly limited as long as transparency, weather resistance, hardness, mechanical strength, and the like can be obtained. The hard coat layer can be composed of an acrylic resin, urethane resin, melamine resin, epoxy resin, organic silicate compound, silicone resin, or the like. In particular, silicone resins and acrylic resins are preferable in terms of hardness and durability. Further, in terms of curability, flexibility, and productivity, those made of an active energy ray-curable acrylic resin or a thermosetting acrylic resin are preferable.

  The active energy ray-curable acrylic resin or thermosetting acrylic resin is a composition containing a polyfunctional acrylate, an acrylic oligomer, or a reactive diluent as a polymerization curing component. In addition, you may use what contains a photoinitiator, a photosensitizer, a thermal-polymerization initiator, a modifier, etc. as needed.

  Acrylic oligomers include polyester acrylates, urethane acrylates, epoxy acrylates, polyether acrylates, etc., including those in which a reactive acrylic group is bonded to an acrylic resin skeleton, and rigid materials such as melamine and isocyanuric acid. A structure in which an acrylic group is bonded to a simple skeleton can also be used.

  In addition, the reactive diluent has a function of a solvent in the coating process as a medium of the coating agent, and has a group that itself reacts with a monofunctional or polyfunctional acrylic oligomer. It becomes a copolymerization component.

  Here, in the hard coat layer, various additives can be further blended as necessary within a range where the effects of the present invention are not impaired. For example, stabilizers such as antioxidants, light stabilizers, ultraviolet absorbers, surfactants, leveling agents, antistatic agents, and the like can be used.

  The leveling agent is particularly effective in reducing surface irregularities when a hard coat layer is applied. As a leveling agent, for example, a dimethylpolysiloxane-polyoxyalkylene copolymer (for example, SH190 manufactured by Toray Dow Corning Co., Ltd.) is suitable as a silicone leveling agent.

(Gas barrier layer)
In the film mirror according to the present invention, a gas barrier layer can be provided for the purpose of preventing deterioration of humidity, in particular, deterioration of the film base material and various functional layers protected by the film base material due to high humidity.

Here, the moisture barrier property of the gas barrier layer is that the water vapor permeability at 40 ° C. and 90% RH is 100 g / m ² · day / μm or less, preferably 50 g / m ² · day / μm or less, more preferably 20 g / m. It is preferable to adjust the moisture resistance of the gas barrier layer so as to be m ² · day / μm or less. Also. The oxygen permeability is preferably 0.6 ml / m ² / day / atm or less under the conditions of a measurement temperature of 23 ° C. and a humidity of 90% RH. The water vapor transmission rate can be measured by, for example, a water vapor transmission rate measuring device PERMATRAN-W3-33 manufactured by MOCON.

  The gas barrier layer applicable here is mainly formed of a metal oxide. However, as the gas barrier layer made of a metal oxide, silicon oxide, aluminum oxide, or composite oxide using silicon oxide and aluminum oxide as a starting material is used. Materials, zinc oxide, tin oxide, indium oxide, niobium oxide, chromium oxide, and the like. In particular, from the viewpoint of water vapor barrier properties, silicon oxide, aluminum oxide, or a composite oxide starting from silicon and aluminum is preferable. These are formed by a vacuum process such as a vacuum deposition method, a sputtering method, a PVD method (physical vapor deposition method) such as ion plating, or a CVD method (chemical vapor deposition method). The thickness of the gas barrier layer made of metal oxide is preferably in the range of 5 to 800 nm, more preferably in the range of 10 to 300 nm.

  Here, a gas barrier layer made of a silicon oxide layer or an aluminum oxide layer or a composite oxide formed using silicon oxide or aluminum oxide as a starting material on a film base is highly resistant to gases such as oxygen, carbon dioxide, air, or water vapor. Excellent barrier action.

  Further, the silicon oxide layer or the aluminum oxide layer, or the composite oxide layer using silicon oxide and aluminum oxide as a starting material has a thickness of 1 μm or less, and the average value of each light transmittance is 90% or more. It is preferable. Thereby, there is no light loss and sunlight can be reflected efficiently.

(Sacrificial protection layer)
The film mirror can be provided with a sacrificial anticorrosive layer. The sacrificial anticorrosive layer is a layer that protects the photothermal reflective layer by sacrificial anticorrosion, and the sacrificial anticorrosive layer is disposed between the photothermal reflective layer and the support to improve the corrosion resistance of the photothermal reflective layer. it can. Here, as the sacrificial anticorrosive layer, copper having a higher ionization tendency than silver suitably used for the photothermal reflective layer is preferable, and the sacrificial anticorrosive layer of copper is formed by providing silver under the reflective layer made of silver. Can be prevented.

[Hollow laminate structure]
Next, the hollow laminated structure used in the present invention will be described. The “hollow laminate structure” is a member that supports the film mirror, and is preferably a plate shape to which the film mirror can be attached, and includes a plurality of wall portions extending along a predetermined direction, and the plurality of the wall mirrors. A pair of plates in contact with both side edges of the wall.

  The hollow laminated structure of the present invention is easy to bend in one direction and has a high rigidity in a different direction. The material may be made of resin or metal.

  When providing a film mirror on the surface of a hollow laminated structure, it is preferable to provide a resin coating layer between them. The resin coating layer is preferably a polyester coating or a fluorine coating.

  According to the present invention, a light-collecting mirror having a light and simple configuration, easy to manufacture, and easy to perform maintenance such as transportation, assembly work, and replacement, and a solar heat collecting system using the same Can be provided.

1 is a perspective view of a trough-type solar heat collecting system 250. FIG. 1 is a diagram schematically showing a cross section of a reflecting mirror 10. FIG. It is a figure which shows the state which attaches the reflective mirror. It is a figure which shows the modification of a hollow laminated structure. It is a figure which shows the modification of the assembly | attachment aspect of the reflective mirror. It is a side view of the test apparatus which used the reflecting mirror.

  Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. In FIG. 1, the perspective view of one Example of the trough type solar heat collecting system 250 is shown.

  The solar heat collecting system 250 has a structure in which the reflecting mirror 10 as a solar light collecting mirror serving as a curved mirror is attached to a support member 40 having a trough structure combined with a frame member in a manner described later. The reflecting mirror 10 is obtained by attaching a film mirror to the surface of a hollow laminated structure.

  FIG. 2 is a diagram schematically showing a cross section of the reflecting mirror 10. In FIG. 2, the hollow laminated structure 11 is integrally formed by extrusion molding or the like from plastic or metal (aluminum or the like), and extends along a predetermined direction (here, the direction perpendicular to the paper surface). 11a and a pair of plates 11b that come into contact with both side edges of the plurality of wall portions 11a. A film mirror 12 is attached to the surface of the hollow laminated structure 11.

  As the film mirror 12, the above-described configuration can be used, but any film having light reflectivity and flexibility can be used.

  The reflecting mirror 10 has a flat plate shape in a free state, but is bent into a parabolic surface in which a parabola extends in the longitudinal direction or a partial cylindrical surface in which an arc extends in the longitudinal direction by being attached to the support member 40. That is, the support member 40 has a cross-sectional shape in which the attached reflecting mirror 10 has a design curved surface shape.

  In FIG. 1, when the reflecting mirror 10 is a set of parabolas, the focal position of the parabola is set, and when the reflector 10 is a set of arcs, the center position thereof is a straight line formed when extending in the axial direction. A receiver 70 having a double-pipe structure is disposed. Water or a refrigerant serving as a heat medium flows through the center of the receiver 70. The outer surface of the inner tube 71 of the receiver 70 is colored black so that solar heat can be absorbed. The outer tube 72 of the receiver 70 is a transparent tube, usually a glass tube. A space between the inner tube 71 and the outer tube 72 is a vacuum heat insulating space, which prevents the collected solar heat from being lost.

  A heat medium is supplied to one end (inlet) 210 of the receiver 70 from a heat medium supply unit (not shown), and the heated heat medium is sent from the other end (outlet) 220 of the receiver 70 to a heat medium recovery unit (not shown). . When the solar heat collecting system 250 is formed in multiple stages, the heat medium is sent from the previous stage to the next stage. A temperature sensor 212 that detects the temperature of the heat medium and a flow meter 214 that detects the flow rate of the heat medium are attached to the inlet 210 side of the receiver 70, and the temperature of the heated heat medium is increased to the outlet 220 side of the receiver 70. A temperature sensor 222 for detecting the above is attached.

  A vertical frame member 44 extends from the upper end to the lower end of the truss-shaped support member 40, and a trapezoidal frame-shaped holding member 46 is provided above the vertical frame member 44. A U-shaped member 45 is formed so as to protrude from the holding member 46, and the receiver 70 passes through the inside of the U-shaped member 45. Thereby, the receiver 70 is held at the focal point of the parabola or the center of the circle.

  Struts 30a and 30b are arranged at both ends in the longitudinal direction of the curved reflecting mirror 10 and outside. The lower end of the support column 30 is fixed to a concrete foundation. A bearing 60 is disposed at the upper end of one of the columns 30a. A member 44a is attached to the vertical frame member 44 of the support member 40 located in the vicinity of the bearing 60, and a swing shaft 44b is fixed to the member 44a. The swing shaft 44b is inserted into the bearing 60 and is held swingably.

  A reduction gear support means 92 is attached to the upper portion of the other column 30b, and a drive gear (worm) 84 of a gear device 85 is rotatably supported by the reduction gear support means 92. A motor 90 with an encoder 100 is attached to one shaft end of the drive gear (worm) 84. As the motor 90, a motor capable of precise positioning such as a pulse motor is used.

  A shaft 83 to which a driven gear (worm wheel) 82 is attached is fixed to the vertical frame member 44 of the support member 40 located in the vicinity of the column 30b. The driven gear (worm wheel) 82 and the drive gear (worm) 84 mesh with each other to form a reduction gear, and constitute a gear device 85. The output of the motor 90 and the rotation angle of the motor 90 detected by the encoder 100 are input to the control device 230. A solar detector 110 is provided on the support member 40 having a trough structure.

  The solar heat collecting system 250 is installed by fixing the support member 40 to a foundation such as concrete so that the longitudinal direction of the reflecting mirror 10 is in the north-south direction. When the support member 40 is installed, the support member 40 is accurately matched in the north-south direction by measuring a shadow at the time of south and middle.

  When the longitudinal direction of the reflecting mirror 10 is set to the north-south direction, the detection direction of the solar detector 110 is set to the north-south direction. In this setting, the measurement of the shadow at the time of south and middle may be used as described above, or may be set to be parallel to the setting direction of the support member 40. Further, the reflecting mirror 10 is set in a horizontal state, and the zero point of the encoder 100 is obtained.

  FIG. 3 is a diagram illustrating a state in which the reflecting mirror 10 is assembled. The support member 40 shown only partially includes a frame 41 having a cross-sectional shape matched to a parabola or an arc shape. The frame 41 has rails 42 that are bent in a parabola or an arc shape at intervals corresponding to the width of the reflecting mirror 10. As shown in the enlarged view of FIG. 3, the rails 42 provided at both ends of the frame 41 have a U-shaped cross section, and the rails 42 provided on the other frames 41 have an E-shaped cross section.

  When the reflecting mirror 10 is assembled, both the edges of the reflecting mirror 10 are fitted into the gaps of the rails 42 and pushed from the ends as shown in FIG. It can be attached to the frame 41 while being bent along the line 42. Since the reflecting mirror 10 of the present embodiment is light, it can be pushed by an operator by hand, and a heavy machine such as a crane is not required, and the number of assembling steps is greatly reduced. At this time, the wall part 11a of the hollow laminated structure 11 (FIG. 2) is located substantially parallel to the axial direction of the receiver 70 (FIG. 1). Therefore, the reflecting mirror 10 is easily bent along the parabola or arc shape of the frame 41 (ideally, a virtual plane obtained by extending the plate portion 11a to the receiver 70 side intersects the receiver 70). Thus, a highly accurate reflective surface shape is obtained so that sufficient light condensing performance can be ensured. On the other hand, since the reflecting mirror 10 has a reinforcing rib structure in the wall portion 11a in the axial direction of the receiver 70 and has high rigidity, the reflecting mirror 10 does not fall off the rail 42 even under strong winds.

  In the present embodiment, by attaching the solar detector 110 to the support member 40, it is possible to detect a deviation from the solar direction of the reflecting mirror 10 from the output of the solar detector 110. Therefore, the control device 230 drives the motor 90 so that the reflecting mirror 10 faces the sun, so that the support member 40 swings together with the reflecting mirror 10. The sunlight reflected from the reflecting mirror 10 is collected on the surface of the receiver 70, whereby the internal heat medium is heated, and the heated heat medium is heated from the other end (exit) 220 of the receiver 70 to the heat (not shown). The power is sent to the medium recovery means for power generation and the like.

  FIG. 4 is a view showing a modification of the hollow laminated structure. The hollow laminated structure 11 is not integrally formed, and as shown in FIG. 4A, similar to the structure of a corrugated cardboard, a plurality of wall portions are constituted by intermediate members 11c that are repeatedly bent into a sine curve wave shape. It is also possible to adopt a split structure in which the two plates 11d are sandwiched and bonded. Alternatively, as shown in FIG. 4 (b), as different materials, a plurality of wall portions are configured by a metal intermediate member 11e repeatedly bent in a triangular wave shape like a tin plate, and two plastic plates 11f are used. It is good also as a different material hybrid structure which pinches and adheres. When bending the reflection mirror having the hollow laminated structure of FIG. 4, if the contact surface at the center position of the wall portion is a “virtual surface”, the virtual surfaces already intersect when the reflection mirror is in a flat plate state. Therefore, the crossing angle is bent so as to increase or decrease.

  FIG. 5 is a view showing a modification of the manner in which the reflecting mirror 10 is assembled. In this example, a screw hole 41a is provided in the frame 41, a through hole 10a is provided in the flat reflecting mirror 10, and the reflecting mirror 10 is pressed against a parabolic or arcuate mounting surface to be inserted into the through hole 10a. Is screwed into the screw hole 41a, and the reflecting mirror 10 is attached following the shape of the frame 41 in a state of being bent into a parabola or an arc shape.

  The results of experiments conducted by the inventor will be described below. The present inventors inserted a reflector having a width of 300 mm × a length of 1000 mm into a rail having a groove gap Δ of 10 mm and a wedge-shaped spacer in the test apparatus shown in the side view of FIG. Fixed. The curvature of the frame to which the reflecting mirror is attached is a paraboloid of approximately R600 mm. The sensor S was arranged at a position corresponding to the receiver 70 (FIG. 1) where the sunlight was reflected and collected by the reflecting mirror, and the temperature was measured. Hereinafter, specifications of the examples and comparative examples will be described.

Example 1: Polypropylene hollow laminated structure (shape of FIG. 2) with a thickness of 3 mm
Example 2: Polypropylene hollow laminated structure (shape of FIG. 2) with a thickness of 5 mm
Example 3: Polypropylene hollow laminated structure (shape of FIG. 4A) with a thickness of 3 mm
Example 4: Polypropylene hollow laminated structure (shape of FIG. 4A) with a thickness of 5 mm
Example 5: Polypropylene hollow laminated structure (shape shown in FIG. 2) having a thickness of 3 mm and containing 10 wt% of carbon black on the film sheet side Example 6: Polypropylene hollow laminated structure (shape shown in FIG. 2) The thickness is 5 mm, and the plate on the film sheet side contains 40 wt% of carbon black. Example 7: PC-made hollow laminated structure (shape of FIG. 2) and thickness is 3 mm
Example 8: PC hollow laminated structure (shape of FIG. 2) with a thickness of 5 mm
Comparative Example 1: A film mirror was attached to the surface of a structure in which polyethylene foam was sandwiched between a pair of aluminum plates, and the thickness was 3 mm.
Comparative Example 2: A film mirror is attached to the surface of a structure in which polyethylene foam is sandwiched between a pair of aluminum plates, and the thickness is 5 mm.
Comparative Example 3: A film mirror is attached to a single-layer acrylic resin plate, and the thickness is 3 mm.
Comparative Example 4: Film mirror pasted on single layer acrylic resin plate, thickness 5 mm
Comparative Example 5: Film mirror pasted on single layer aluminum plate, thickness 3 mm
Comparative Example 6: Film mirror pasted on single layer aluminum plate, thickness 5 mm
Comparative Example 7: Reflective film deposition on glass plate, thickness is 3 mm
Comparative Example 8: Reflective film deposition on glass plate, thickness is 5 mm

  About the Example and the comparative example, it experimented about each of the rail insertion condition, insertion time, and condensing temperature. As an evaluation standard of the rail insertion condition, it was indicated as “◯” when all the rails were inserted, “Δ” when the rails could be inserted halfway, and “x” when the rails could not be completely inserted. In addition, as the evaluation standard of the rail insertion time, it was rated as ○ if the insertion time was within 5 minutes, Δ if it was within 6 to 15 minutes, and × if it took more than 16 minutes. Furthermore, as an evaluation standard of the condensing temperature, the experiment was evaluated as ◯ if the temperature increased above 140 ° C, △ if the temperature increased from 100 to 139 ° C, and x if the temperature increased only below 99 ° C. The results are summarized in Table 1.

  In Comparative Example 1, the rail insertion condition and insertion time were evaluated as “good”, but the light collection temperature was evaluated as “good”. Observation showed that there was a slight lift of the reflector in the rail, and the reproducibility of the paraboloid was inferior, affecting the light collecting power. In Comparative Example 2, all evaluations of the rail insertion condition, insertion time, and condensing temperature were Δ. In Comparative Example 3, the rail insertion condition was evaluated as “good”, but the insertion time was evaluated as “poor”, and the condensing temperature was “Δ”. In Comparative Example 4, the evaluation of the rail insertion condition, insertion time, and condensing temperature were all x. In Comparative Example 5, the evaluation of the rail insertion condition was Δ, and the evaluation of the insertion time and condensing temperature was x. In Comparative Examples 6 to 8, the evaluation of the rail insertion condition, the insertion time, and the light collection temperature were all x.

  On the other hand, in all of Examples 1 to 8, the evaluation of the rail insertion condition, the insertion time, and the light collection temperature are all “◯”, and the effect of the present invention was confirmed.

DESCRIPTION OF SYMBOLS 10 Reflective mirror 10a Through-hole 11 Hollow laminated structure 11a Wall part 11b Plate 11c Intermediate member 11d Plate 11e Intermediate member 11f Plastic plate 12 Film mirror 30 Column 30a Column 30b Column 40 Support member 41 Frame 41a Screw hole 42 Rail 44 Vertical frame member 44a Member 44b Oscillating shaft 45 U-shaped member 46 Holding member 60 Bearing 70 Receiver 71 Inner tube 72 Outer tube 83 Shaft 85 Gear device 90 Motor 92 Reducer support means 100 Encoder 110 Solar detector 210 Inlet 212 Temperature sensor 214 Flow meter 220 Outlet 222 Temperature sensor 230 Controller 250 Solar heat collecting system BT Bolt S sensor

Claims (6)

  A film mirror is provided on the surface of a hollow laminated structure including a plurality of wall portions extending along a predetermined direction and a pair of plates in contact with both side edges of the plurality of wall portions. Mirror for collecting sunlight.   The hollow laminated structure is attached to a trough-type support structure, wherein the plurality of wall portions are bent so that virtual surfaces extending to one side of the pair of plates intersect each other. The solar light collecting mirror according to claim 1.   The solar light collecting mirror according to claim 1, wherein the hollow laminated structure is made of plastic or metal.   4. The solar light collecting mirror according to claim 1, wherein at least the hollow laminated structure plate provided with the film mirror contains conductive fine particles. 5.   The solar light collecting mirror according to claim 4, wherein the fine particles are carbon black having a concentration of 5 to 50 wt%. A solar power generation system with a trough-type support structure,
It has at least 1 heat collection part and the mirror for sunlight condensing in any one of Claims 1-5, The said mirror for sunlight condensing reflects sunlight in the said heat collection part. A solar heat collection system characterized by irradiation.

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