WO2014068755A1 - Solar light heat collecting tube and solar light heat collector using same - Google Patents
Solar light heat collecting tube and solar light heat collector using same Download PDFInfo
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- WO2014068755A1 WO2014068755A1 PCT/JP2012/078360 JP2012078360W WO2014068755A1 WO 2014068755 A1 WO2014068755 A1 WO 2014068755A1 JP 2012078360 W JP2012078360 W JP 2012078360W WO 2014068755 A1 WO2014068755 A1 WO 2014068755A1
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- collecting tube
- heat collecting
- solar heat
- solar
- solar light
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S70/00—Details of absorbing elements
- F24S70/20—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption
- F24S70/225—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption for spectrally selective absorption
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
- F24S80/60—Thermal insulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S70/00—Details of absorbing elements
- F24S70/60—Details of absorbing elements characterised by the structure or construction
- F24S2070/62—Heat traps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
- F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
- F24S23/74—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with trough-shaped or cylindro-parabolic reflective surfaces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
Definitions
- the present invention relates to a solar heat collecting tube and a solar heat collector using the same.
- a vacuum glass tube has been used as a solar heat collecting tube because it can suppress heat loss due to air convection (for example, see Patent Document 1).
- Patent Document 1 the inside of the tube exposed to high temperatures must be kept in a vacuum for a long time, and there are problems such as fatigue of the glass material due to thermal expansion and contraction during the day and night, and reduction in heat collection efficiency due to reflection of the glass surface. It was.
- an object of the present invention is to provide a solar heat collecting tube with high heat collection efficiency and a solar heat collector using the same.
- the present inventor has shown that the use of a cylindrical heat collecting tube provided with a slit-like opening improves the heat collecting efficiency without using a vacuum glass tube.
- the headline and the present invention were completed. That is, the present invention provides the following (1) to (6).
- a solar heat collecting tube that collects sunlight and heats a heat medium
- the shape of the solar heat collecting tube is a partially cut-out cylindrical shape having slit-like openings throughout the major axis direction
- a solar heat collecting tube in which the ratio of the area of the inner wall surface to the area of the opening (opening / inner wall) is 2.5 to 30.0%.
- the solar heat collecting tube according to the above (1) which has a selective absorption film that transmits visible light and near infrared rays of the sunlight and reflects far infrared rays radiated from the heat medium on the inner wall surface.
- a solar collector having a solar collector tube and a condensing reflector The solar heat collecting tube is the solar heat collecting tube according to any one of the above (1) to (5), The solar collector which the said solar heat collecting tube is provided in the focus of the said condensing reflector.
- a solar heat collecting tube with high heat collection efficiency and a solar heat collector using the same can be provided.
- the solar heat collecting tube of the present invention can be formed using a metal base material such as stainless steel, heat-resistant steel, etc., it is superior in long-term reliability than a vacuum glass tube and is easy to manufacture, Very useful.
- the solar heat collecting tube of the present invention is a solar heat collecting tube that collects sunlight and heats a heat medium, and the shape of the solar heat collecting tube has slit-like openings throughout the major axis.
- the solar heat collecting tube has a partially cut-out cylindrical shape, and the ratio of the area of the inner wall surface to the area of the opening (opening / inner wall) is 2.5 to 30.0%.
- the solar heat collecting tube 10 of the present invention is a heat collecting tube provided in the solar heat collector 1 of the present invention, condenses the sunlight reflected by the condensing reflector 2, and heats it. A heat collecting tube for heating the medium.
- the shape of the solar heat collecting tube 10 of this invention is a cylinder shape provided with the slit-shaped opening part 11, and specifically, it shows to FIG. 2 (A). As shown in FIGS. 2 (B) and 2 (C), it may be a circular cylinder (including an ellipse).
- the ratio of the area of the inner wall surface of the solar heat collecting tube to the area of the opening (opening / inner wall) is 2.5 to 30.0%.
- the inner wall surface of the solar heat collecting tube refers to the light receiving surface of sunlight (reflected light)
- the area refers to the area of the inner surface of the solar heat collecting tube not including the area of the opening.
- the opening part of a solar heat collecting tube means the taking-in port of sunlight (reflected light)
- the area is short of an opening part, for example, when the cross-sectional shape of a solar heat collecting tube is uniform. It is a value calculated from the product of the side and the long side (that is, the length of the solar heat collecting tube in the long axis direction).
- the length of the shortest side is said.
- the ratio is in the range of 2.5 to 30.0%, the heat collecting efficiency of the solar heat collecting tube is increased. This is because sunlight (reflected light) incident from the opening is confined in the cylindrical shape of the solar heat collecting tube and repeatedly reflected on the inner wall of the solar heat collecting tube as shown in FIG. it is conceivable that.
- the ratio is preferably 5 to 25%, more preferably 10 to 20%, because the heat collection efficiency of the solar heat collecting tube becomes higher.
- the base material of the solar heat collecting tube of the present invention is not particularly limited, and a heat-resistant metal base material such as an iron-based material (for example, stainless steel, heat-resistant steel, alloy steel, carbon steel, etc.) or an aluminum-based material is used. be able to. Among these, it is preferable to use stainless steel or heat-resistant steel in consideration of the use environment, for example, considering that the solar heat collecting tube is heated to about 500 ° C. and that a heat medium such as a molten salt can be used. .
- the material of the stainless steel is not particularly limited, and examples thereof include a material containing 5 to 40% of Cr and 5% or less of Mo, and 5% of an arbitrary component such as Ti, Nb, and Cu.
- the heat-resistant steel is not particularly limited, and examples thereof include materials containing Ni, Co, W, Mo, Nb, and other alloy elements in addition to several percent or more of Cr, and the structure thereof is martensitic or ferrite. , Austenite type and precipitation hardening type.
- the solar heat collecting tube 10 of the present invention preferably has a selective absorption film 12 on the inner wall surface because the heat collecting efficiency of the solar heat collecting tube becomes higher.
- the selective absorption film is a film that transmits visible light and near infrared rays of sunlight and reflects far infrared rays radiated from the heat medium.
- the selective absorption film is, for example, a film that absorbs at a wavelength of 0.5 ⁇ m, which is an approximate intensity peak of sunlight (air mass 1), of 60% or more, preferably 80% or more, and black body radiation of 600K.
- films having an absorption of 70% or less, preferably 50% or less (reflection is less than 50%) at a wavelength of 5 ⁇ m, which is an approximate intensity peak specifically, for example, black chrome plating film, black nickel plating A film, an electroless nickel blackening film, a triiron tetroxide film, or the like can be suitably used.
- the solar heat collecting tube 10 of the present invention has a heat insulating layer 13 or a selective absorption film (not shown) similar to the above on the outer wall surface because the heat collecting efficiency of the solar heat collecting tube becomes higher.
- the heat insulating layer for example, it is preferable to use an inorganic heat-resistant heat insulating material, and specifically, glass wool, slag wool, ceramic fiber, inorganic foaming material, or the like can be suitably used.
- the thickness of the said heat insulation layer is not specifically limited, The thing to about 10 cm is applicable.
- the solar collector of the present invention is a solar collector having the above-described solar collector tube of the present invention and a condensing reflector, and the solar collector tube is at the focal point of the concentrator reflector. It is a solar collector provided. Next, the structure of the solar heat collector of this invention is demonstrated using drawing.
- the solar heat collector 1 of the present invention includes the above-described solar heat collecting tube 10 of the present invention and the condensing reflector 2.
- the condensing reflection plate 2 is mounted on the support base 4 together with the tracking mechanism 3, and the solar heat collecting tube 10 is a support member so as to be positioned at the focal point (condensing portion) of the condensing reflection plate 2. 5 is supported and fixed to the condenser reflector 2.
- the solar heat collecting tube 10 is preferably fixed so that the center of the opening 11 is the focal point (condenser) of the condensing reflector 2.
- the surface of the condensing reflector 2 facing the solar heat collecting tube 10 is a curved trough-type mirror surface, and the sunlight incident on the condensing reflecting plate 2 is reflected to the solar heat collecting tube 10. Condensed.
- the said condensing reflecting plate is rolled, it will not specifically limit, As a material, a steel plate, an aluminum plate, a plastic plate etc. are mentioned, for example.
- the steel plate is not particularly limited as long as it is a normal steel plate. However, from the viewpoint of light resistance, weather resistance, and economy, a cold-rolled steel plate and a stainless steel plate are preferable, and a surface-treated steel plate and stainless steel are preferable because they have excellent corrosion resistance on the back surface. A steel plate is more preferable.
- the thickness of the light collecting and reflecting plate is not particularly limited, but it is preferably thinner from the viewpoint of facilitating the bending process, specifically 0.5 mm or less, more preferably 0.15 mm or less.
- the said condensing reflecting plate has a reflecting film on the surface.
- the reflective film is preferably a metal-containing film, and as the metal, silver (Ag) and aluminum (Al) having high reflectivity are preferably used, and aluminum is preferable from an economical viewpoint. .
- the said condensing reflecting plate has a protective film on the surface (The surface of the said reflecting film when it has the said reflecting film.).
- the protective film is a transparent conventional well-known protective film for withstanding outdoor erosion.
- the protective film is mainly composed of silicon oxide (SiO, SiO 2 ), and is mainly composed of aluminum oxide (Al 2 O 3 ). And a protective film.
- a heat medium (for example, oil, molten salt, water, etc.) 14 flows in the solar collector tube 10.
- the heat medium is circulated by a pump (not shown).
- the solar heat collecting tube 10 is heated by the sunlight reflected by the said condensing reflector, the heat medium 14 which flows into the inside of the solar heat collecting tube 10 is also heated, and the heated heat medium 14 becomes a steam turbine. Power is generated by being sent to (not shown) to evaporate water and turning this steam turbine.
- the heat medium 14 is not limited to a mode of flowing inside the solar heat collecting tube 10.
- the heat medium pipe 15 provided near the inner wall of the solar heat collecting tube 10. It may be a mode that flows in the inside, and as shown in FIG. 4B, in a mode that flows in the heat medium pipe 15 provided between the inner wall and the outer wall of the solar heat collecting tube 10 (double wall structure). There may be.
- a vacuum glass tube (manufactured by Terada Iron Works) is used as a solar heat collecting tube, and an aluminum metal film is formed by vacuum deposition on a curved stainless steel plate (SUS430, plate thickness: 0.1 mm, manufactured by JFE Steel) as a condensing reflector.
- a solar collector using a trough-type substrate having a film formed thereon was fabricated.
- a selective absorption film is provided on the inner wall surface for a hollow stainless steel having a ratio of openings (hereinafter referred to as “opening ratio”) shown in Table 1 below, and a heat insulating layer is formed on the outer wall surface.
- opening ratio a ratio of openings
- a solar heat collector was produced in the same manner as in the reference example except that. Specifically, first, stainless steel (SUS447J1, plate thickness: 3.0 mm) is curved using a U press, an O press, or the like to obtain a desired opening ratio, and is indicated by reference numeral 10a shown in FIG. A part to be manufactured was prepared.
- stainless steel SUS447J1, plate thickness: 3.0 mm
- a portion indicated by reference numeral 10b shown in FIG. 5 was produced.
- Each of these portions was welded at a portion denoted by reference numeral 10c shown in FIG. 5 to produce a substantially cylindrical base material partially lacking.
- black chromium plating was applied to the inner wall surface of the base material by electroplating to form a selective absorption film (film thickness: 1 ⁇ m).
- ceramic foam was sprayed on the surface of the outer wall of the base material to form a heat insulating layer.
- Example 12 A solar heat collector was produced in the same manner as in Example 7 except that heat-resistant steel (SUH660, plate thickness: 3.0 mm) was used instead of stainless steel.
- heat-resistant steel SAH660, plate thickness: 3.0 mm
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Abstract
The purpose of the present invention is to provide a solar light heat collecting tube having high heat collection efficiency, and a solar light heat collector using the solar light heat collecting tube. This solar light heat collecting tube that heats a heat medium by collecting solar light has a partially cut cylindrical shape, which has a slit-like opening in the whole region in the long axis direction, and which has a ratio (the opening/inner wall) of 2.5-30.0 % between the area of an inner wall surface and the area of the opening.
Description
本発明は、太陽光集熱管およびそれを用いた太陽光集熱器に関する。
The present invention relates to a solar heat collecting tube and a solar heat collector using the same.
太陽光集熱管としては、従来、空気の対流による熱損失を抑制できる等の理由から、真空ガラス管が使われていた（例えば、特許文献１等参照）。
しかしながら、高温に曝される管内を長期にわたって真空に維持しなければならず、また、昼夜の熱膨張・収縮によるガラス材料の疲労や、ガラスの表面反射による集熱効率の低下などの問題点があった。 Conventionally, a vacuum glass tube has been used as a solar heat collecting tube because it can suppress heat loss due to air convection (for example, see Patent Document 1).
However, the inside of the tube exposed to high temperatures must be kept in a vacuum for a long time, and there are problems such as fatigue of the glass material due to thermal expansion and contraction during the day and night, and reduction in heat collection efficiency due to reflection of the glass surface. It was.
しかしながら、高温に曝される管内を長期にわたって真空に維持しなければならず、また、昼夜の熱膨張・収縮によるガラス材料の疲労や、ガラスの表面反射による集熱効率の低下などの問題点があった。 Conventionally, a vacuum glass tube has been used as a solar heat collecting tube because it can suppress heat loss due to air convection (for example, see Patent Document 1).
However, the inside of the tube exposed to high temperatures must be kept in a vacuum for a long time, and there are problems such as fatigue of the glass material due to thermal expansion and contraction during the day and night, and reduction in heat collection efficiency due to reflection of the glass surface. It was.
そこで、本発明は、集熱効率の高い太陽光集熱管およびそれを用いた太陽光集熱器を提供することを課題とする。
Therefore, an object of the present invention is to provide a solar heat collecting tube with high heat collection efficiency and a solar heat collector using the same.
本発明者は、上記課題を解決するため鋭意検討した結果、スリット状の開口部が設けられた筒形状の集熱管を用いることにより、真空ガラス管を用いなくても集熱効率が高くなることを見出し、本発明を完成させた。すなわち、本発明は、下記（１）～（６）を提供するものである。
As a result of intensive studies to solve the above problems, the present inventor has shown that the use of a cylindrical heat collecting tube provided with a slit-like opening improves the heat collecting efficiency without using a vacuum glass tube. The headline and the present invention were completed. That is, the present invention provides the following (1) to (6).
（１）太陽光を集光して熱媒体を加熱する太陽光集熱管であって、
上記太陽光集熱管の形状が、長軸方向の全域にスリット状の開口部を有する一部欠き筒形状であり、
内壁表面の面積と上記開口部の面積との比率（開口部／内壁）が、２．５～３０．０％である太陽光集熱管。 (1) A solar heat collecting tube that collects sunlight and heats a heat medium,
The shape of the solar heat collecting tube is a partially cut-out cylindrical shape having slit-like openings throughout the major axis direction,
A solar heat collecting tube in which the ratio of the area of the inner wall surface to the area of the opening (opening / inner wall) is 2.5 to 30.0%.
上記太陽光集熱管の形状が、長軸方向の全域にスリット状の開口部を有する一部欠き筒形状であり、
内壁表面の面積と上記開口部の面積との比率（開口部／内壁）が、２．５～３０．０％である太陽光集熱管。 (1) A solar heat collecting tube that collects sunlight and heats a heat medium,
The shape of the solar heat collecting tube is a partially cut-out cylindrical shape having slit-like openings throughout the major axis direction,
A solar heat collecting tube in which the ratio of the area of the inner wall surface to the area of the opening (opening / inner wall) is 2.5 to 30.0%.
（２）内壁表面に、上記太陽光の可視光線および近赤外線を透過し、上記熱媒体から輻射される遠赤外線を反射する選択吸収膜を有する上記（１）に記載の太陽光集熱管。
(2) The solar heat collecting tube according to the above (1), which has a selective absorption film that transmits visible light and near infrared rays of the sunlight and reflects far infrared rays radiated from the heat medium on the inner wall surface.
（３）上記太陽光集熱管を構成する基材がステンレス鋼および/または耐熱鋼である上記（１）または（２）に記載の太陽光集熱管。
(3) The solar heat collecting tube according to the above (1) or (2), wherein the base material constituting the solar heat collecting tube is stainless steel and / or heat resistant steel.
（４）外壁表面に断熱層を有する上記（１）～（３）のいずれかに記載の太陽光集熱管。
(4) The solar heat collecting tube according to any one of (1) to (3), wherein the outer wall surface has a heat insulating layer.
（５）外壁表面に、上記太陽光の可視光線および近赤外線を透過し、上記媒体から輻射される遠赤外線を反射する選択吸収膜を有する上記（１）～（３）のいずれかに記載の太陽光集熱管。
(5) The method according to any one of (1) to (3), further comprising a selective absorption film that transmits visible light and near infrared light of the sunlight and reflects far infrared light radiated from the medium on the outer wall surface. Solar collector tube.
（６）太陽光集熱管と集光反射板とを有する太陽光集熱器であって、
上記太陽光集熱管が、上記（１）～（５）のいずれかに記載の太陽光集熱管であり、
上記太陽光集熱管が、上記集光反射板の焦点に設けられる太陽光集熱器。 (6) A solar collector having a solar collector tube and a condensing reflector,
The solar heat collecting tube is the solar heat collecting tube according to any one of the above (1) to (5),
The solar collector which the said solar heat collecting tube is provided in the focus of the said condensing reflector.
上記太陽光集熱管が、上記（１）～（５）のいずれかに記載の太陽光集熱管であり、
上記太陽光集熱管が、上記集光反射板の焦点に設けられる太陽光集熱器。 (6) A solar collector having a solar collector tube and a condensing reflector,
The solar heat collecting tube is the solar heat collecting tube according to any one of the above (1) to (5),
The solar collector which the said solar heat collecting tube is provided in the focus of the said condensing reflector.
以下に示すように、本発明によれば、集熱効率の高い太陽光集熱管およびそれを用いた太陽光集熱器を提供することができる。
また、本発明の太陽光集熱管は、ステンレス鋼、耐熱鋼等の金属基材を用いて形成することができるため、真空ガラス管よりも長期の信頼性に優れ、製造も容易となるため、非常に有用である。 As shown below, according to the present invention, a solar heat collecting tube with high heat collection efficiency and a solar heat collector using the same can be provided.
Moreover, since the solar heat collecting tube of the present invention can be formed using a metal base material such as stainless steel, heat-resistant steel, etc., it is superior in long-term reliability than a vacuum glass tube and is easy to manufacture, Very useful.
また、本発明の太陽光集熱管は、ステンレス鋼、耐熱鋼等の金属基材を用いて形成することができるため、真空ガラス管よりも長期の信頼性に優れ、製造も容易となるため、非常に有用である。 As shown below, according to the present invention, a solar heat collecting tube with high heat collection efficiency and a solar heat collector using the same can be provided.
Moreover, since the solar heat collecting tube of the present invention can be formed using a metal base material such as stainless steel, heat-resistant steel, etc., it is superior in long-term reliability than a vacuum glass tube and is easy to manufacture, Very useful.
〔太陽光集熱管〕
本発明の太陽光集熱管は、太陽光を集光して熱媒体を加熱する太陽光集熱管であって、上記太陽光集熱管の形状が長軸方向の全域にスリット状の開口部を有する一部欠き筒形状であり、内壁表面の面積と上記開口部の面積との比率（開口部／内壁）が２．５～３０．０％である太陽光集熱管である。
次に、本発明の太陽光集熱管の構成について、図面を用いて説明する。 [Solar collector tube]
The solar heat collecting tube of the present invention is a solar heat collecting tube that collects sunlight and heats a heat medium, and the shape of the solar heat collecting tube has slit-like openings throughout the major axis. The solar heat collecting tube has a partially cut-out cylindrical shape, and the ratio of the area of the inner wall surface to the area of the opening (opening / inner wall) is 2.5 to 30.0%.
Next, the structure of the solar heat collecting tube of this invention is demonstrated using drawing.
本発明の太陽光集熱管は、太陽光を集光して熱媒体を加熱する太陽光集熱管であって、上記太陽光集熱管の形状が長軸方向の全域にスリット状の開口部を有する一部欠き筒形状であり、内壁表面の面積と上記開口部の面積との比率（開口部／内壁）が２．５～３０．０％である太陽光集熱管である。
次に、本発明の太陽光集熱管の構成について、図面を用いて説明する。 [Solar collector tube]
The solar heat collecting tube of the present invention is a solar heat collecting tube that collects sunlight and heats a heat medium, and the shape of the solar heat collecting tube has slit-like openings throughout the major axis. The solar heat collecting tube has a partially cut-out cylindrical shape, and the ratio of the area of the inner wall surface to the area of the opening (opening / inner wall) is 2.5 to 30.0%.
Next, the structure of the solar heat collecting tube of this invention is demonstrated using drawing.
＜全体形状＞
図１に示す通り、本発明の太陽光集熱管１０は、本発明の太陽光集熱器１が具備する集熱管であって、集光反射板２によって反射した太陽光を集光し、熱媒体を加熱するための集熱管である。
また、図１および図２に示す通り、本発明の太陽光集熱管１０の形状は、スリット状の開口部１１が設けられた筒形状であり、具体的には、図２（Ａ）に示すように円（楕円を含む）筒形状であるのが好ましいが、図２（Ｂ）および（Ｃ）に示すように多角筒形状であってもよい。 <Overall shape>
As shown in FIG. 1, the solarheat collecting tube 10 of the present invention is a heat collecting tube provided in the solar heat collector 1 of the present invention, condenses the sunlight reflected by the condensing reflector 2, and heats it. A heat collecting tube for heating the medium.
Moreover, as shown in FIG. 1 and FIG. 2, the shape of the solarheat collecting tube 10 of this invention is a cylinder shape provided with the slit-shaped opening part 11, and specifically, it shows to FIG. 2 (A). As shown in FIGS. 2 (B) and 2 (C), it may be a circular cylinder (including an ellipse).
図１に示す通り、本発明の太陽光集熱管１０は、本発明の太陽光集熱器１が具備する集熱管であって、集光反射板２によって反射した太陽光を集光し、熱媒体を加熱するための集熱管である。
また、図１および図２に示す通り、本発明の太陽光集熱管１０の形状は、スリット状の開口部１１が設けられた筒形状であり、具体的には、図２（Ａ）に示すように円（楕円を含む）筒形状であるのが好ましいが、図２（Ｂ）および（Ｃ）に示すように多角筒形状であってもよい。 <Overall shape>
As shown in FIG. 1, the solar
Moreover, as shown in FIG. 1 and FIG. 2, the shape of the solar
＜開口部＞
本発明においては、太陽光集熱管の内壁表面の面積と開口部の面積との比率（開口部／内壁）が２．５～３０．０％である。
ここで、太陽光集熱管の内壁表面とは、太陽光（反射光）の受光面のことをいい、その面積とは、開口部の面積を含まない太陽光集熱管の内面の面積のことをいう。
また、太陽光集熱管の開口部とは、太陽光（反射光）の取り込み口をいい、その面積とは、例えば、太陽光集熱管の断面形状が均一である場合には、開口部の短辺と長辺（すなわち太陽光集熱管の長軸方向の長さ）との積から算出される値をいう。なお、短辺について、図２（Ａ）に示すように太陽光集熱管の厚みによって異なる場合は、最も短い辺の長さをいう。
そして、上記比率が２．５～３０．０％の範囲であると、太陽光集熱管の集熱効率が高くなる。これは、上記開口部から入射した太陽光（反射光）が、太陽光集熱管の筒形状に閉じ込められ、図２（Ａ）に示すように太陽光集熱管の内壁で反射を繰り返すためであると考えられる。
上記比率は、太陽光集熱管の集熱効率がより高くなる理由から、５～２５％であるのが好ましく、１０～２０％であるのがより好ましい。 <Opening>
In the present invention, the ratio of the area of the inner wall surface of the solar heat collecting tube to the area of the opening (opening / inner wall) is 2.5 to 30.0%.
Here, the inner wall surface of the solar heat collecting tube refers to the light receiving surface of sunlight (reflected light), and the area refers to the area of the inner surface of the solar heat collecting tube not including the area of the opening. Say.
Moreover, the opening part of a solar heat collecting tube means the taking-in port of sunlight (reflected light), and the area is short of an opening part, for example, when the cross-sectional shape of a solar heat collecting tube is uniform. It is a value calculated from the product of the side and the long side (that is, the length of the solar heat collecting tube in the long axis direction). In addition, about the short side, when it changes with thickness of a solar heat collecting tube as shown to FIG. 2 (A), the length of the shortest side is said.
When the ratio is in the range of 2.5 to 30.0%, the heat collecting efficiency of the solar heat collecting tube is increased. This is because sunlight (reflected light) incident from the opening is confined in the cylindrical shape of the solar heat collecting tube and repeatedly reflected on the inner wall of the solar heat collecting tube as shown in FIG. it is conceivable that.
The ratio is preferably 5 to 25%, more preferably 10 to 20%, because the heat collection efficiency of the solar heat collecting tube becomes higher.
本発明においては、太陽光集熱管の内壁表面の面積と開口部の面積との比率（開口部／内壁）が２．５～３０．０％である。
ここで、太陽光集熱管の内壁表面とは、太陽光（反射光）の受光面のことをいい、その面積とは、開口部の面積を含まない太陽光集熱管の内面の面積のことをいう。
また、太陽光集熱管の開口部とは、太陽光（反射光）の取り込み口をいい、その面積とは、例えば、太陽光集熱管の断面形状が均一である場合には、開口部の短辺と長辺（すなわち太陽光集熱管の長軸方向の長さ）との積から算出される値をいう。なお、短辺について、図２（Ａ）に示すように太陽光集熱管の厚みによって異なる場合は、最も短い辺の長さをいう。
そして、上記比率が２．５～３０．０％の範囲であると、太陽光集熱管の集熱効率が高くなる。これは、上記開口部から入射した太陽光（反射光）が、太陽光集熱管の筒形状に閉じ込められ、図２（Ａ）に示すように太陽光集熱管の内壁で反射を繰り返すためであると考えられる。
上記比率は、太陽光集熱管の集熱効率がより高くなる理由から、５～２５％であるのが好ましく、１０～２０％であるのがより好ましい。 <Opening>
In the present invention, the ratio of the area of the inner wall surface of the solar heat collecting tube to the area of the opening (opening / inner wall) is 2.5 to 30.0%.
Here, the inner wall surface of the solar heat collecting tube refers to the light receiving surface of sunlight (reflected light), and the area refers to the area of the inner surface of the solar heat collecting tube not including the area of the opening. Say.
Moreover, the opening part of a solar heat collecting tube means the taking-in port of sunlight (reflected light), and the area is short of an opening part, for example, when the cross-sectional shape of a solar heat collecting tube is uniform. It is a value calculated from the product of the side and the long side (that is, the length of the solar heat collecting tube in the long axis direction). In addition, about the short side, when it changes with thickness of a solar heat collecting tube as shown to FIG. 2 (A), the length of the shortest side is said.
When the ratio is in the range of 2.5 to 30.0%, the heat collecting efficiency of the solar heat collecting tube is increased. This is because sunlight (reflected light) incident from the opening is confined in the cylindrical shape of the solar heat collecting tube and repeatedly reflected on the inner wall of the solar heat collecting tube as shown in FIG. it is conceivable that.
The ratio is preferably 5 to 25%, more preferably 10 to 20%, because the heat collection efficiency of the solar heat collecting tube becomes higher.
＜基材＞
本発明の太陽光集熱管の基材は特に限定されず、鉄系材料（例えば、ステンレス鋼、耐熱鋼、合金鋼、炭素鋼等）、アルミニウム系材料等の耐熱性のある金属基材を用いることができる。
これらのうち、使用環境の観点、例えば、太陽光集熱管が５００℃程度まで加熱され、また、溶融塩等の熱媒体を使用しうることを考慮すると、ステンレス鋼、耐熱鋼であるのが好ましい。
ここで、ステンレス鋼の材料は特に限定されず、例えば、Ｃｒを５～４０％含有し、Ｍｏを５％以下含有する材料が挙げられる、また、Ｔｉ，Ｎｂ，Ｃｕ等の任意成分を５％程度添加した材料を用いることもできる。
また、耐熱鋼は特に限定されず、例えば、数％以上のＣｒのほか、Ｎｉ、Ｃｏ、Ｗ、Ｍｏ、Ｎｂ、その他の合金元素を含む材料が挙げられ、その組織はマルテンサイト系、フェライト系、オーステナイト系および析出硬化系のものが挙げられる。 <Base material>
The base material of the solar heat collecting tube of the present invention is not particularly limited, and a heat-resistant metal base material such as an iron-based material (for example, stainless steel, heat-resistant steel, alloy steel, carbon steel, etc.) or an aluminum-based material is used. be able to.
Among these, it is preferable to use stainless steel or heat-resistant steel in consideration of the use environment, for example, considering that the solar heat collecting tube is heated to about 500 ° C. and that a heat medium such as a molten salt can be used. .
Here, the material of the stainless steel is not particularly limited, and examples thereof include a material containing 5 to 40% of Cr and 5% or less of Mo, and 5% of an arbitrary component such as Ti, Nb, and Cu. A material added to a certain degree can also be used.
The heat-resistant steel is not particularly limited, and examples thereof include materials containing Ni, Co, W, Mo, Nb, and other alloy elements in addition to several percent or more of Cr, and the structure thereof is martensitic or ferrite. , Austenite type and precipitation hardening type.
本発明の太陽光集熱管の基材は特に限定されず、鉄系材料（例えば、ステンレス鋼、耐熱鋼、合金鋼、炭素鋼等）、アルミニウム系材料等の耐熱性のある金属基材を用いることができる。
これらのうち、使用環境の観点、例えば、太陽光集熱管が５００℃程度まで加熱され、また、溶融塩等の熱媒体を使用しうることを考慮すると、ステンレス鋼、耐熱鋼であるのが好ましい。
ここで、ステンレス鋼の材料は特に限定されず、例えば、Ｃｒを５～４０％含有し、Ｍｏを５％以下含有する材料が挙げられる、また、Ｔｉ，Ｎｂ，Ｃｕ等の任意成分を５％程度添加した材料を用いることもできる。
また、耐熱鋼は特に限定されず、例えば、数％以上のＣｒのほか、Ｎｉ、Ｃｏ、Ｗ、Ｍｏ、Ｎｂ、その他の合金元素を含む材料が挙げられ、その組織はマルテンサイト系、フェライト系、オーステナイト系および析出硬化系のものが挙げられる。 <Base material>
The base material of the solar heat collecting tube of the present invention is not particularly limited, and a heat-resistant metal base material such as an iron-based material (for example, stainless steel, heat-resistant steel, alloy steel, carbon steel, etc.) or an aluminum-based material is used. be able to.
Among these, it is preferable to use stainless steel or heat-resistant steel in consideration of the use environment, for example, considering that the solar heat collecting tube is heated to about 500 ° C. and that a heat medium such as a molten salt can be used. .
Here, the material of the stainless steel is not particularly limited, and examples thereof include a material containing 5 to 40% of Cr and 5% or less of Mo, and 5% of an arbitrary component such as Ti, Nb, and Cu. A material added to a certain degree can also be used.
The heat-resistant steel is not particularly limited, and examples thereof include materials containing Ni, Co, W, Mo, Nb, and other alloy elements in addition to several percent or more of Cr, and the structure thereof is martensitic or ferrite. , Austenite type and precipitation hardening type.
＜選択吸収膜，断熱層＞
図３に示す通り、本発明の太陽光集熱管１０は、太陽光集熱管の集熱効率がより高くなる理由から、内壁表面に選択吸収膜１２を有するのが好ましい。
ここで、上記選択吸収膜は、太陽光の可視光線および近赤外線を透過し、上記熱媒体から輻射される遠赤外線を反射する膜であり、このような膜を設けることにより、本発明の太陽光集熱管は、効率よく太陽光のエネルギーを吸収すると共に、熱媒体からの輻射熱を抑えることができる。
また、上記選択吸収膜としては、例えば、太陽光（エアマス１）のおよその強度ピークとなる波長０．５μｍでの吸収が６０％以上、好ましくは８０％以上の膜で、６００Ｋの黒体放射のおよその強度ピークとなる波長５μｍでの吸収が７０％以下、好ましくは５０％以下（反射が５０％未満）の膜が挙げられ、具体的には、例えば、黒色クロムめっき膜、黒色ニッケルめっき膜、無電解ニッケル黒化処理膜、四三酸化鉄皮膜等を好適に用いることができる。 <Selective absorption membrane, heat insulation layer>
As shown in FIG. 3, the solarheat collecting tube 10 of the present invention preferably has a selective absorption film 12 on the inner wall surface because the heat collecting efficiency of the solar heat collecting tube becomes higher.
Here, the selective absorption film is a film that transmits visible light and near infrared rays of sunlight and reflects far infrared rays radiated from the heat medium. By providing such a film, the solar of the present invention is provided. The light collecting tube can efficiently absorb sunlight energy and suppress radiant heat from the heat medium.
The selective absorption film is, for example, a film that absorbs at a wavelength of 0.5 μm, which is an approximate intensity peak of sunlight (air mass 1), of 60% or more, preferably 80% or more, and black body radiation of 600K. Examples include films having an absorption of 70% or less, preferably 50% or less (reflection is less than 50%) at a wavelength of 5 μm, which is an approximate intensity peak, specifically, for example, black chrome plating film, black nickel plating A film, an electroless nickel blackening film, a triiron tetroxide film, or the like can be suitably used.
図３に示す通り、本発明の太陽光集熱管１０は、太陽光集熱管の集熱効率がより高くなる理由から、内壁表面に選択吸収膜１２を有するのが好ましい。
ここで、上記選択吸収膜は、太陽光の可視光線および近赤外線を透過し、上記熱媒体から輻射される遠赤外線を反射する膜であり、このような膜を設けることにより、本発明の太陽光集熱管は、効率よく太陽光のエネルギーを吸収すると共に、熱媒体からの輻射熱を抑えることができる。
また、上記選択吸収膜としては、例えば、太陽光（エアマス１）のおよその強度ピークとなる波長０．５μｍでの吸収が６０％以上、好ましくは８０％以上の膜で、６００Ｋの黒体放射のおよその強度ピークとなる波長５μｍでの吸収が７０％以下、好ましくは５０％以下（反射が５０％未満）の膜が挙げられ、具体的には、例えば、黒色クロムめっき膜、黒色ニッケルめっき膜、無電解ニッケル黒化処理膜、四三酸化鉄皮膜等を好適に用いることができる。 <Selective absorption membrane, heat insulation layer>
As shown in FIG. 3, the solar
Here, the selective absorption film is a film that transmits visible light and near infrared rays of sunlight and reflects far infrared rays radiated from the heat medium. By providing such a film, the solar of the present invention is provided. The light collecting tube can efficiently absorb sunlight energy and suppress radiant heat from the heat medium.
The selective absorption film is, for example, a film that absorbs at a wavelength of 0.5 μm, which is an approximate intensity peak of sunlight (air mass 1), of 60% or more, preferably 80% or more, and black body radiation of 600K. Examples include films having an absorption of 70% or less, preferably 50% or less (reflection is less than 50%) at a wavelength of 5 μm, which is an approximate intensity peak, specifically, for example, black chrome plating film, black nickel plating A film, an electroless nickel blackening film, a triiron tetroxide film, or the like can be suitably used.
また、図３に示す通り、本発明の太陽光集熱管１０は、太陽光集熱管の集熱効率がより高くなる理由から、外壁表面に断熱層１３または上記と同様の選択吸収膜（図示せず）を有するのが好ましい。
ここで、上記断熱層としては、例えば、無機系の耐熱断熱材を用いるのが好ましく、具体的には、グラスウール、スラグウール、セラミックファイバー、無機発泡材等を好適に用いることができる。
また、上記断熱層の厚みは特に限定されず、１０ｃｍ程度までのものが適用できる。 Further, as shown in FIG. 3, the solarheat collecting tube 10 of the present invention has a heat insulating layer 13 or a selective absorption film (not shown) similar to the above on the outer wall surface because the heat collecting efficiency of the solar heat collecting tube becomes higher. ).
Here, as the heat insulating layer, for example, it is preferable to use an inorganic heat-resistant heat insulating material, and specifically, glass wool, slag wool, ceramic fiber, inorganic foaming material, or the like can be suitably used.
Moreover, the thickness of the said heat insulation layer is not specifically limited, The thing to about 10 cm is applicable.
ここで、上記断熱層としては、例えば、無機系の耐熱断熱材を用いるのが好ましく、具体的には、グラスウール、スラグウール、セラミックファイバー、無機発泡材等を好適に用いることができる。
また、上記断熱層の厚みは特に限定されず、１０ｃｍ程度までのものが適用できる。 Further, as shown in FIG. 3, the solar
Here, as the heat insulating layer, for example, it is preferable to use an inorganic heat-resistant heat insulating material, and specifically, glass wool, slag wool, ceramic fiber, inorganic foaming material, or the like can be suitably used.
Moreover, the thickness of the said heat insulation layer is not specifically limited, The thing to about 10 cm is applicable.
〔太陽光集熱器〕
本発明の太陽光集熱器は、上述した本発明の太陽光集熱管と集光反射板とを有する太陽光集熱器であって、上記太陽光集熱管が上記集光反射板の焦点に設けられる太陽光集熱器である。
次に、本発明の太陽光集熱器の構成について、図面を用いて説明する。 [Solar collector]
The solar collector of the present invention is a solar collector having the above-described solar collector tube of the present invention and a condensing reflector, and the solar collector tube is at the focal point of the concentrator reflector. It is a solar collector provided.
Next, the structure of the solar heat collector of this invention is demonstrated using drawing.
本発明の太陽光集熱器は、上述した本発明の太陽光集熱管と集光反射板とを有する太陽光集熱器であって、上記太陽光集熱管が上記集光反射板の焦点に設けられる太陽光集熱器である。
次に、本発明の太陽光集熱器の構成について、図面を用いて説明する。 [Solar collector]
The solar collector of the present invention is a solar collector having the above-described solar collector tube of the present invention and a condensing reflector, and the solar collector tube is at the focal point of the concentrator reflector. It is a solar collector provided.
Next, the structure of the solar heat collector of this invention is demonstrated using drawing.
＜全体形状＞
図１に示す通り、本発明の太陽光集熱器１は、上述した本発明の太陽光集熱管１０と集光反射板２とを有する。
ここで、集光反射板２は、追尾機構３と共に支持台４に載せられており、太陽光集熱管１０は、集光反射板２の焦点（集光部）に位置するように、支持部材５によって集光反射板２に支持固定されている。具体的には、太陽光集熱管１０は、その開口部１１の中心が集光反射板２の焦点（集光部）となるように固定されるのが好ましい。
また、集光反射板２の太陽光集熱管１０に対面する面は、湾曲したトラフ型の鏡面になっており、集光反射板２に入射した太陽光は反射して太陽光集熱管１０に集光するようになっている。 <Overall shape>
As shown in FIG. 1, the solar heat collector 1 of the present invention includes the above-described solarheat collecting tube 10 of the present invention and the condensing reflector 2.
Here, the condensingreflection plate 2 is mounted on the support base 4 together with the tracking mechanism 3, and the solar heat collecting tube 10 is a support member so as to be positioned at the focal point (condensing portion) of the condensing reflection plate 2. 5 is supported and fixed to the condenser reflector 2. Specifically, the solar heat collecting tube 10 is preferably fixed so that the center of the opening 11 is the focal point (condenser) of the condensing reflector 2.
Further, the surface of the condensingreflector 2 facing the solar heat collecting tube 10 is a curved trough-type mirror surface, and the sunlight incident on the condensing reflecting plate 2 is reflected to the solar heat collecting tube 10. Condensed.
図１に示す通り、本発明の太陽光集熱器１は、上述した本発明の太陽光集熱管１０と集光反射板２とを有する。
ここで、集光反射板２は、追尾機構３と共に支持台４に載せられており、太陽光集熱管１０は、集光反射板２の焦点（集光部）に位置するように、支持部材５によって集光反射板２に支持固定されている。具体的には、太陽光集熱管１０は、その開口部１１の中心が集光反射板２の焦点（集光部）となるように固定されるのが好ましい。
また、集光反射板２の太陽光集熱管１０に対面する面は、湾曲したトラフ型の鏡面になっており、集光反射板２に入射した太陽光は反射して太陽光集熱管１０に集光するようになっている。 <Overall shape>
As shown in FIG. 1, the solar heat collector 1 of the present invention includes the above-described solar
Here, the condensing
Further, the surface of the condensing
＜集光反射板＞
上記集光反射板は、圧延加工されたものであれば特に限定されず、その材料としては、例えば、鋼板、アルミニウム板、プラスチック板等が挙げられる。鋼板としては、通常の鋼板であれば特に限定されないが、耐光性、耐候性、経済性の観点から、冷延鋼板、ステンレス鋼板が好ましく、裏面の耐食性に優れるという理由から、表面処理鋼板やステンレス鋼板がより好ましい。
また、上記集光反射板の板厚は特に限定されないが、湾曲加工を容易にする観点から薄い方が好ましく、具体的には、０．５ｍｍ以下が好ましく、０．１５ｍｍ以下がより好ましい。 <Condensing reflector>
If the said condensing reflecting plate is rolled, it will not specifically limit, As a material, a steel plate, an aluminum plate, a plastic plate etc. are mentioned, for example. The steel plate is not particularly limited as long as it is a normal steel plate. However, from the viewpoint of light resistance, weather resistance, and economy, a cold-rolled steel plate and a stainless steel plate are preferable, and a surface-treated steel plate and stainless steel are preferable because they have excellent corrosion resistance on the back surface. A steel plate is more preferable.
In addition, the thickness of the light collecting and reflecting plate is not particularly limited, but it is preferably thinner from the viewpoint of facilitating the bending process, specifically 0.5 mm or less, more preferably 0.15 mm or less.
上記集光反射板は、圧延加工されたものであれば特に限定されず、その材料としては、例えば、鋼板、アルミニウム板、プラスチック板等が挙げられる。鋼板としては、通常の鋼板であれば特に限定されないが、耐光性、耐候性、経済性の観点から、冷延鋼板、ステンレス鋼板が好ましく、裏面の耐食性に優れるという理由から、表面処理鋼板やステンレス鋼板がより好ましい。
また、上記集光反射板の板厚は特に限定されないが、湾曲加工を容易にする観点から薄い方が好ましく、具体的には、０．５ｍｍ以下が好ましく、０．１５ｍｍ以下がより好ましい。 <Condensing reflector>
If the said condensing reflecting plate is rolled, it will not specifically limit, As a material, a steel plate, an aluminum plate, a plastic plate etc. are mentioned, for example. The steel plate is not particularly limited as long as it is a normal steel plate. However, from the viewpoint of light resistance, weather resistance, and economy, a cold-rolled steel plate and a stainless steel plate are preferable, and a surface-treated steel plate and stainless steel are preferable because they have excellent corrosion resistance on the back surface. A steel plate is more preferable.
In addition, the thickness of the light collecting and reflecting plate is not particularly limited, but it is preferably thinner from the viewpoint of facilitating the bending process, specifically 0.5 mm or less, more preferably 0.15 mm or less.
＜反射膜＞
本発明においては、上記集光反射板は、その表面に反射膜を有しているのが好ましい。
上記反射膜は、金属を含有する膜であるのが好ましく、この金属としては、反射率の高い銀（Ａｇ）、アルミニウム（Ａｌ）が好適に用いられ、経済的な観点からは、アルミニウムが好ましい。 <Reflective film>
In this invention, it is preferable that the said condensing reflecting plate has a reflecting film on the surface.
The reflective film is preferably a metal-containing film, and as the metal, silver (Ag) and aluminum (Al) having high reflectivity are preferably used, and aluminum is preferable from an economical viewpoint. .
本発明においては、上記集光反射板は、その表面に反射膜を有しているのが好ましい。
上記反射膜は、金属を含有する膜であるのが好ましく、この金属としては、反射率の高い銀（Ａｇ）、アルミニウム（Ａｌ）が好適に用いられ、経済的な観点からは、アルミニウムが好ましい。 <Reflective film>
In this invention, it is preferable that the said condensing reflecting plate has a reflecting film on the surface.
The reflective film is preferably a metal-containing film, and as the metal, silver (Ag) and aluminum (Al) having high reflectivity are preferably used, and aluminum is preferable from an economical viewpoint. .
＜保護膜＞
また、本発明においては、上記集光反射板は、その表面（上記反射膜を有している場合は上記反射膜の表面）に保護膜を有しているのが好ましい。
上記保護膜は、屋外侵食に耐えるための透明な従来公知の保護膜であり、例えば、酸化ケイ素（ＳｉＯ、ＳｉＯ２）を主成分とした保護膜、酸化アルミニウム（Ａｌ２Ｏ３）を主成分とした保護膜などが挙げられる。 <Protective film>
Moreover, in this invention, it is preferable that the said condensing reflecting plate has a protective film on the surface (The surface of the said reflecting film when it has the said reflecting film.).
The protective film is a transparent conventional well-known protective film for withstanding outdoor erosion. For example, the protective film is mainly composed of silicon oxide (SiO, SiO 2 ), and is mainly composed of aluminum oxide (Al 2 O 3 ). And a protective film.
また、本発明においては、上記集光反射板は、その表面（上記反射膜を有している場合は上記反射膜の表面）に保護膜を有しているのが好ましい。
上記保護膜は、屋外侵食に耐えるための透明な従来公知の保護膜であり、例えば、酸化ケイ素（ＳｉＯ、ＳｉＯ２）を主成分とした保護膜、酸化アルミニウム（Ａｌ２Ｏ３）を主成分とした保護膜などが挙げられる。 <Protective film>
Moreover, in this invention, it is preferable that the said condensing reflecting plate has a protective film on the surface (The surface of the said reflecting film when it has the said reflecting film.).
The protective film is a transparent conventional well-known protective film for withstanding outdoor erosion. For example, the protective film is mainly composed of silicon oxide (SiO, SiO 2 ), and is mainly composed of aluminum oxide (Al 2 O 3 ). And a protective film.
本発明の太陽光集熱器が太陽熱発電に用いられる場合においては、例えば、図３に示す通り、太陽光集熱管１０の内部に熱媒体（例えば、オイル、溶融塩、水等）１４が流れており、熱媒体はポンプ（図示せず）によって循環されている。
そして、上記集光反射板で反射した太陽光により太陽光集熱管１０が加熱されることで、太陽光集熱管１０の内部に流れる熱媒体１４も加熱され、加熱された熱媒体１４が蒸気タービン（図示せず）に送られて水を蒸発させ、この蒸気タービンを回すことにより、発電が行われる。
ここで、熱媒体１４は、太陽光集熱管１０の内部に流れる態様に限定されず、例えば、図４（Ａ）に示すように、太陽光集熱管１０の内壁近傍に設けられる熱媒パイプ１５中を流れる態様であってもよく、図４（Ｂ）に示すように、太陽光集熱管１０の内壁と外壁との間に設けられる熱媒パイプ１５中を流れる態様（二重壁構造）であってもよい。 When the solar collector of the present invention is used for solar power generation, for example, as shown in FIG. 3, a heat medium (for example, oil, molten salt, water, etc.) 14 flows in thesolar collector tube 10. The heat medium is circulated by a pump (not shown).
And the solarheat collecting tube 10 is heated by the sunlight reflected by the said condensing reflector, the heat medium 14 which flows into the inside of the solar heat collecting tube 10 is also heated, and the heated heat medium 14 becomes a steam turbine. Power is generated by being sent to (not shown) to evaporate water and turning this steam turbine.
Here, theheat medium 14 is not limited to a mode of flowing inside the solar heat collecting tube 10. For example, as shown in FIG. 4A, the heat medium pipe 15 provided near the inner wall of the solar heat collecting tube 10. It may be a mode that flows in the inside, and as shown in FIG. 4B, in a mode that flows in the heat medium pipe 15 provided between the inner wall and the outer wall of the solar heat collecting tube 10 (double wall structure). There may be.
そして、上記集光反射板で反射した太陽光により太陽光集熱管１０が加熱されることで、太陽光集熱管１０の内部に流れる熱媒体１４も加熱され、加熱された熱媒体１４が蒸気タービン（図示せず）に送られて水を蒸発させ、この蒸気タービンを回すことにより、発電が行われる。
ここで、熱媒体１４は、太陽光集熱管１０の内部に流れる態様に限定されず、例えば、図４（Ａ）に示すように、太陽光集熱管１０の内壁近傍に設けられる熱媒パイプ１５中を流れる態様であってもよく、図４（Ｂ）に示すように、太陽光集熱管１０の内壁と外壁との間に設けられる熱媒パイプ１５中を流れる態様（二重壁構造）であってもよい。 When the solar collector of the present invention is used for solar power generation, for example, as shown in FIG. 3, a heat medium (for example, oil, molten salt, water, etc.) 14 flows in the
And the solar
Here, the
＜参考例（基準例）＞
太陽光集熱管として真空ガラス管（寺田鉄工所社製）を用い、集光反射板として湾曲させたステンレス鋼板（ＳＵＳ４３０、板厚：０．１ｍｍ、ＪＦＥスチール社製）に真空蒸着によりアルミニウム金属膜を成膜したトラフ型の基板を用いた太陽光集熱器を作製した。 <Reference example (standard example)>
A vacuum glass tube (manufactured by Terada Iron Works) is used as a solar heat collecting tube, and an aluminum metal film is formed by vacuum deposition on a curved stainless steel plate (SUS430, plate thickness: 0.1 mm, manufactured by JFE Steel) as a condensing reflector. A solar collector using a trough-type substrate having a film formed thereon was fabricated.
太陽光集熱管として真空ガラス管（寺田鉄工所社製）を用い、集光反射板として湾曲させたステンレス鋼板（ＳＵＳ４３０、板厚：０．１ｍｍ、ＪＦＥスチール社製）に真空蒸着によりアルミニウム金属膜を成膜したトラフ型の基板を用いた太陽光集熱器を作製した。 <Reference example (standard example)>
A vacuum glass tube (manufactured by Terada Iron Works) is used as a solar heat collecting tube, and an aluminum metal film is formed by vacuum deposition on a curved stainless steel plate (SUS430, plate thickness: 0.1 mm, manufactured by JFE Steel) as a condensing reflector. A solar collector using a trough-type substrate having a film formed thereon was fabricated.
＜実施例１～１１、比較例１～１２＞
太陽光集熱管として、下記第１表に示す開口部の比率（以下、「開口率」という。）となる中空のステンレス鋼に対して、内壁表面に選択吸収膜を設け、外壁表面に断熱層を設けた以外は、参考例と同様の方法で太陽光集熱器を作製した。
具体的には、まず、ＵプレスおよびＯプレス等を用いて、所望の開口率となるように、ステンレス鋼（ＳＵＳ４４７Ｊ１、板厚：３．０ｍｍ）を湾曲させ、図５に示す符号１０ａで示される部分を作製した。
次いで、同様に、ＵプレスおよびＯプレス等を用いて、ステンレス鋼（ＳＵＳ４４７Ｊ１、板厚：３．０ｍｍ）を湾曲させ、図５に示す符号１０ｂで示される部分を作製した。
これらの各部分を図５に示す符号１０ｃの部分で溶接し、一部欠き略円筒形状の基材を作製した。
次いで、基材の内壁表面に、電気めっきにより黒色クロムめっきを施し、選択吸収膜（膜厚：１μｍ）を形成した。
次いで、基材の外壁表面に、発泡セラミックスを吹き付け、断熱層を形成した。 <Examples 1 to 11 and Comparative Examples 1 to 12>
As a solar heat collecting tube, a selective absorption film is provided on the inner wall surface for a hollow stainless steel having a ratio of openings (hereinafter referred to as “opening ratio”) shown in Table 1 below, and a heat insulating layer is formed on the outer wall surface. A solar heat collector was produced in the same manner as in the reference example except that.
Specifically, first, stainless steel (SUS447J1, plate thickness: 3.0 mm) is curved using a U press, an O press, or the like to obtain a desired opening ratio, and is indicated byreference numeral 10a shown in FIG. A part to be manufactured was prepared.
Next, similarly, stainless steel (SUS447J1, plate thickness: 3.0 mm) was curved using a U press, an O press, or the like, and a portion indicated byreference numeral 10b shown in FIG. 5 was produced.
Each of these portions was welded at a portion denoted byreference numeral 10c shown in FIG. 5 to produce a substantially cylindrical base material partially lacking.
Next, black chromium plating was applied to the inner wall surface of the base material by electroplating to form a selective absorption film (film thickness: 1 μm).
Next, ceramic foam was sprayed on the surface of the outer wall of the base material to form a heat insulating layer.
太陽光集熱管として、下記第１表に示す開口部の比率（以下、「開口率」という。）となる中空のステンレス鋼に対して、内壁表面に選択吸収膜を設け、外壁表面に断熱層を設けた以外は、参考例と同様の方法で太陽光集熱器を作製した。
具体的には、まず、ＵプレスおよびＯプレス等を用いて、所望の開口率となるように、ステンレス鋼（ＳＵＳ４４７Ｊ１、板厚：３．０ｍｍ）を湾曲させ、図５に示す符号１０ａで示される部分を作製した。
次いで、同様に、ＵプレスおよびＯプレス等を用いて、ステンレス鋼（ＳＵＳ４４７Ｊ１、板厚：３．０ｍｍ）を湾曲させ、図５に示す符号１０ｂで示される部分を作製した。
これらの各部分を図５に示す符号１０ｃの部分で溶接し、一部欠き略円筒形状の基材を作製した。
次いで、基材の内壁表面に、電気めっきにより黒色クロムめっきを施し、選択吸収膜（膜厚：１μｍ）を形成した。
次いで、基材の外壁表面に、発泡セラミックスを吹き付け、断熱層を形成した。 <Examples 1 to 11 and Comparative Examples 1 to 12>
As a solar heat collecting tube, a selective absorption film is provided on the inner wall surface for a hollow stainless steel having a ratio of openings (hereinafter referred to as “opening ratio”) shown in Table 1 below, and a heat insulating layer is formed on the outer wall surface. A solar heat collector was produced in the same manner as in the reference example except that.
Specifically, first, stainless steel (SUS447J1, plate thickness: 3.0 mm) is curved using a U press, an O press, or the like to obtain a desired opening ratio, and is indicated by
Next, similarly, stainless steel (SUS447J1, plate thickness: 3.0 mm) was curved using a U press, an O press, or the like, and a portion indicated by
Each of these portions was welded at a portion denoted by
Next, black chromium plating was applied to the inner wall surface of the base material by electroplating to form a selective absorption film (film thickness: 1 μm).
Next, ceramic foam was sprayed on the surface of the outer wall of the base material to form a heat insulating layer.
＜実施例１２＞
ステンレス鋼に代えて耐熱鋼（ＳＵＨ６６０、板厚：３．０ｍｍ）を使用した以外は、実施例７と同様の方法により、太陽光集熱器を作製した。 <Example 12>
A solar heat collector was produced in the same manner as in Example 7 except that heat-resistant steel (SUH660, plate thickness: 3.0 mm) was used instead of stainless steel.
ステンレス鋼に代えて耐熱鋼（ＳＵＨ６６０、板厚：３．０ｍｍ）を使用した以外は、実施例７と同様の方法により、太陽光集熱器を作製した。 <Example 12>
A solar heat collector was produced in the same manner as in Example 7 except that heat-resistant steel (SUH660, plate thickness: 3.0 mm) was used instead of stainless steel.
作製した各太陽光集熱器について、ＪＩＳ Ａ４１１２:2011に規定された測定方法に従って、熱媒体として水を使用し、液体集熱式の集熱効率を測定した。結果を下記第１表および図６に示す。
なお、下記第１表および図６中の集熱効率（％）は、参考例の集光効率を１００とした時の相対値である。 About each produced solar collector, according to the measuring method prescribed | regulated to JISA4112: 2011, water was used as a heat medium and the liquid heat collection type heat collection efficiency was measured. The results are shown in Table 1 below and FIG.
In addition, the heat collection efficiency (%) in the following Table 1 and FIG. 6 is a relative value when the light collection efficiency of the reference example is 100.
なお、下記第１表および図６中の集熱効率（％）は、参考例の集光効率を１００とした時の相対値である。 About each produced solar collector, according to the measuring method prescribed | regulated to JISA4112: 2011, water was used as a heat medium and the liquid heat collection type heat collection efficiency was measured. The results are shown in Table 1 below and FIG.
In addition, the heat collection efficiency (%) in the following Table 1 and FIG. 6 is a relative value when the light collection efficiency of the reference example is 100.
第１表および図６に示す通り、開口率が２．５～３０．０％となる所定のスリットを有する筒形状の太陽光集熱管を用いると、真空ガラス管を用いた参考例よりも集熱効率が高くなることが分かった。
As shown in Table 1 and FIG. 6, when a cylindrical solar heat collecting tube having a predetermined slit with an aperture ratio of 2.5 to 30.0% is used, it is more concentrated than a reference example using a vacuum glass tube. It was found that the thermal efficiency was increased.
１ 太陽光集熱器
２ 集光反射板
３ 追尾機構
４ 支持台
５ 支持部材
１０ 太陽光集熱管
１１ 開口部
１２ 選択吸収膜
１３ 断熱層
１４ 熱媒体
１５ 熱媒パイプ DESCRIPTION OF SYMBOLS 1Solar collector 2 Condensing reflecting plate 3 Tracking mechanism 4 Support stand 5 Support member 10 Solar heat collecting tube 11 Opening part 12 Selective absorption film 13 Heat insulation layer 14 Heat medium 15 Heat medium pipe
２ 集光反射板
３ 追尾機構
４ 支持台
５ 支持部材
１０ 太陽光集熱管
１１ 開口部
１２ 選択吸収膜
１３ 断熱層
１４ 熱媒体
１５ 熱媒パイプ DESCRIPTION OF SYMBOLS 1
Claims (6)
- 太陽光を集光して熱媒体を加熱する太陽光集熱管であって、
前記太陽光集熱管の形状が、長軸方向の全域にスリット状の開口部を有する一部欠き筒形状であり、
内壁表面の面積と前記開口部の面積との比率（開口部／内壁）が、２．５～３０．０％である太陽光集熱管。 A solar heat collecting tube that collects sunlight and heats a heat medium,
The shape of the solar heat collecting tube is a partially cut-out cylindrical shape having slit-like openings throughout the major axis direction,
A solar heat collecting tube, wherein the ratio of the area of the inner wall surface to the area of the opening (opening / inner wall) is 2.5 to 30.0%. - 内壁表面に、前記太陽光の可視光線および近赤外線を透過し、前記熱媒体から輻射される遠赤外線を反射する選択吸収膜を有する請求項１に記載の太陽光集熱管。 The solar heat collecting tube according to claim 1, further comprising a selective absorption film that transmits visible light and near infrared light of the sunlight and reflects far infrared light radiated from the heat medium on an inner wall surface.
- 前記太陽光集熱管を構成する基材がステンレス鋼および/または耐熱鋼である請求項１または２に記載の太陽光集熱管。 The solar heat collecting tube according to claim 1 or 2, wherein the base material constituting the solar heat collecting tube is stainless steel and / or heat resistant steel.
- 外壁表面に断熱層を有する請求項１～３のいずれか一項に記載の太陽光集熱管。 The solar heat collecting tube according to any one of claims 1 to 3, further comprising a heat insulating layer on the outer wall surface.
- 外壁表面に、前記太陽光の可視光線および近赤外線を透過し、前記媒体から輻射される遠赤外線を反射する選択吸収膜を有する請求項１～３のいずれか一項に記載の太陽光集熱管。 The solar heat collecting tube according to any one of claims 1 to 3, further comprising a selective absorption film that transmits visible light and near infrared light of the sunlight and reflects far infrared light radiated from the medium on an outer wall surface. .
- 太陽光集熱管と集光反射板とを有する太陽光集熱器であって、
前記太陽光集熱管が、請求項１～５のいずれか一項に記載の太陽光集熱管であり、
前記太陽光集熱管が、前記集光反射板の焦点に設けられる太陽光集熱器。 A solar collector having a solar collector tube and a condensing reflector,
The solar heat collecting tube is the solar heat collecting tube according to any one of claims 1 to 5,
The solar collector which the said solar heat collecting tube is provided in the focus of the said condensing reflector.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107713751A (en) * | 2017-12-08 | 2018-02-23 | 曾融 | A kind of outdoor solar energy kettle teapot |
| ES2844976A1 (en) * | 2020-01-22 | 2021-07-23 | Univ Malaga | Double cavity receiver for linear focus solar collectors (Machine-translation by Google Translate, not legally binding) |
| ES2844999A1 (en) * | 2020-01-22 | 2021-07-23 | Univ Malaga | Linear focus solar collector with horseshoe-shaped open receiver (Machine-translation by Google Translate, not legally binding) |
| CN114357711A (en) * | 2021-12-03 | 2022-04-15 | 中广核太阳能开发有限公司 | Heat collection tube bending processing method and device based on truncation ratio calculation |
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| JPS5697752A (en) * | 1979-12-29 | 1981-08-06 | Matsushita Electric Works Ltd | Heat-collecting pipe for solar-heat water heater |
| JPS5795548A (en) * | 1980-12-05 | 1982-06-14 | Taiyo Sanso Kk | Solar heat collector device |
| JPS57129348A (en) * | 1981-02-02 | 1982-08-11 | Taiyo Sanso Kk | Solar heat collector |
| JPS5846056U (en) * | 1981-09-24 | 1983-03-28 | 株式会社富士電機総合研究所 | Solar collector plate |
| JPH10306946A (en) * | 1997-05-06 | 1998-11-17 | Pado:Kk | Solar heat utilizing heating medium heater |
| JP2008215740A (en) * | 2007-03-06 | 2008-09-18 | Matsushita Electric Ind Co Ltd | Heat collector |
Cited By (7)
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| CN107713751A (en) * | 2017-12-08 | 2018-02-23 | 曾融 | A kind of outdoor solar energy kettle teapot |
| CN107713751B (en) * | 2017-12-08 | 2023-08-15 | 江门市新会区沃浩进出口有限公司 | Outdoor solar energy kettle |
| ES2844976A1 (en) * | 2020-01-22 | 2021-07-23 | Univ Malaga | Double cavity receiver for linear focus solar collectors (Machine-translation by Google Translate, not legally binding) |
| ES2844999A1 (en) * | 2020-01-22 | 2021-07-23 | Univ Malaga | Linear focus solar collector with horseshoe-shaped open receiver (Machine-translation by Google Translate, not legally binding) |
| WO2021148703A1 (en) * | 2020-01-22 | 2021-07-29 | Universidad De Málaga | Double-cavity receiver for linear-focus solar collectors |
| WO2021148701A1 (en) * | 2020-01-22 | 2021-07-29 | Universidad De Málaga | Linear-focus solar collector with horseshoe-shaped open receiver |
| CN114357711A (en) * | 2021-12-03 | 2022-04-15 | 中广核太阳能开发有限公司 | Heat collection tube bending processing method and device based on truncation ratio calculation |
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