JP2001099497A - Solar heat collecting plate - Google Patents
Solar heat collecting plateInfo
- Publication number
- JP2001099497A JP2001099497A JP27823299A JP27823299A JP2001099497A JP 2001099497 A JP2001099497 A JP 2001099497A JP 27823299 A JP27823299 A JP 27823299A JP 27823299 A JP27823299 A JP 27823299A JP 2001099497 A JP2001099497 A JP 2001099497A
- Authority
- JP
- Japan
- Prior art keywords
- wavelength
- coating
- heat collecting
- average
- collecting plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/50—Solar heat collectors using working fluids the working fluids being conveyed between plates
- F24S10/504—Solar heat collectors using working fluids the working fluids being conveyed between plates having conduits formed by paired non-plane plates
-
- 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
-
- 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
- Y02E10/44—Heat exchange systems
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、裏面側からの赤外線放
射で熱媒体を加熱するようにした太陽熱集熱板に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar heat collecting plate for heating a heat medium by infrared radiation from the back side.
【０００２】[0002]
【従来技術】地球温暖化防止のため、ＣＯ2排出を伴う
化石燃料の代わりに太陽光のエネルギ−の利用が注目さ
れている。太陽光の利用は太陽熱温水器などで一部実用
化されているが、その集熱部は太陽熱集熱板をパイプや
波板状に成形して、内部を水などの熱媒体が流れるよう
にしている。この太陽熱集熱板としては、基材にステン
レス鋼板、アルミニウム板、銅板などのように熱伝導率
が高く、耐食性の材料を用いて、その表面側に熱吸収性
のブラッククロム、ブラックニッケルなどの被膜を形成
したものやそれらの熱吸収性物質の粉末を含有する塗膜
を形成することにより太陽光の主波長である波長０.３
〜２.０μｍの光を吸収するようにしたもので、裏面側
は、基材が耐食性材料であるので、裸のままにしてい
る。BACKGROUND OF THE INVENTION prevent global warming, solar energy instead of fossil fuels with CO 2 emissions - use is attention. The use of sunlight is partially used in solar water heaters, etc., but the heat collecting part is formed by shaping a solar heat collecting plate into a pipe or corrugated sheet so that a heat medium such as water flows inside. ing. This solar heat collecting plate is made of a material with high thermal conductivity, such as stainless steel plate, aluminum plate, copper plate, etc. By forming a coating film or a coating film containing the powder of the heat absorbing substance, a wavelength of 0.3, which is the main wavelength of sunlight, is obtained.
It absorbs light of up to 2.0 μm, and the back side is left bare because the base material is a corrosion-resistant material.
【０００３】ところで、太陽熱温水器などの集熱部で集
熱板から熱媒体への熱伝播は、例えば、図１に示すよう
に、太陽熱集熱板１と熱媒体２との間に空間３を設け
て、裏面側から赤外線放射によるのが伝導や対流より熱
損失が少ない。しかし、太陽熱集熱板は裏面側が赤外線
放射率の低い基材の露出したものであるので、集熱部で
の熱伝播は伝導や対流により行うしか方法がなく、熱損
失が大きいという欠点があった。By the way, in a heat collecting portion such as a solar water heater, heat is propagated from the heat collecting plate to the heat medium by, for example, a space 3 between the solar heat collecting plate 1 and the heat medium 2 as shown in FIG. The heat loss due to infrared radiation from the back side is smaller than that of conduction or convection. However, since the backside of the solar heat collecting plate is an exposed base material with low infrared emissivity, there is no other way than to conduct heat propagation in the heat collecting part by conduction or convection. Was.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、裏面側から
の赤外線放射率を大きくして、熱損失を少なくした太陽
熱集熱板を提供するものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a solar heat collecting plate in which heat radiation is reduced by increasing the emissivity of infrared rays from the back side.
【０００５】[0005]
【課題を解決するための手段】本発明の太陽熱集熱板
は、金属基材の表面側に太陽光の主波長である波長０.
３〜２.０μｍの可視光線と近赤外線を吸収可能で、平
均膜厚が０.２〜４.０μｍの被膜が形成され、裏面側に
は平均膜厚が７μｍ以上の被膜が形成されていることを
特徴としている。この太陽熱集熱板で裏面側の被膜は表
面粗度が中心線平均粗さで３μｍ以上、うねりの平均波
長が２００μｍ以下であることが好ましく、表面側の被
膜はカ−ボンブラック、遷移元素の酸化物または複合酸
化物、ＴｉＣ、ＴｉＮ、ＴｉＢ2、ＴｉＯ、ＺｒＣから
選ばれた１種または２種以上を含有するのが好ましい。The solar heat collecting plate of the present invention has a wavelength of 0.1 mm, which is the main wavelength of sunlight, on the surface side of a metal substrate.
A film having an average film thickness of 0.2 to 4.0 μm is formed, capable of absorbing visible light and near infrared rays of 3 to 2.0 μm, and a film having an average film thickness of 7 μm or more is formed on the back side. It is characterized by: In this solar heat collecting plate, the coating on the back side preferably has a surface roughness of 3 μm or more in center line average roughness and an average wavelength of undulation of 200 μm or less, and the coating on the front side is carbon black or a transition element. It is preferable to contain one or more selected from oxides or composite oxides, TiC, TiN, TiB 2 , TiO, and ZrC.
【０００６】[0006]
【作用】本発明者らは、表面側に太陽光の主波長である
可視光線と近赤外線（波長０.３〜２.０μｍ）を吸収す
る被膜が形成された太陽熱集熱板において、裏面側の赤
外線放射率を高める方法を種々検討した結果、表面側の
被膜を平均膜厚で０.２〜４.０μｍにして、裏面側に平
均膜厚が７μｍ以上の被膜を形成すればよいことを見い
だした。すなわち、表面側の被膜は平均膜厚で０.２μ
ｍ以上にして、太陽光の主波長である波長０.３〜２.０
μｍの可視光線と近赤外線を吸収できるようにするとと
もに、赤外線の波長より短い４.０μｍ以下にすること
により赤外線放射率を低くして、太陽熱が集熱板に蓄積
されるようにする。そして、裏面側に被膜を形成して、
その平均膜厚を７μｍ以上にすると、被膜が樹脂であっ
ても、基材の影響が現れず、赤外線放射率が高い。７μ
ｍ未満であると、基材からの波長の長い赤外線が透過し
てしまい、基材の影響が現れる。The present inventors have proposed a solar heat collecting plate having a coating on the front side which absorbs visible light, which is the main wavelength of sunlight, and near infrared rays (wavelength: 0.3 to 2.0 μm). As a result of various studies on methods for increasing the infrared emissivity of the above, it was found that the average thickness of the coating on the front side was 0.2 to 4.0 μm, and that the average thickness of the coating on the rear side was 7 μm or more. I found it. That is, the coating on the surface side has an average thickness of 0.2 μm.
m or more, and 0.3 to 2.0, which is the main wavelength of sunlight.
In addition to being able to absorb visible light and near-infrared light of μm, the infrared emissivity is reduced by setting the wavelength to 4.0 μm or less, which is shorter than the wavelength of infrared light, so that solar heat is accumulated on the heat collecting plate. And a film is formed on the back side,
When the average film thickness is 7 μm or more, even if the film is a resin, the influence of the base material does not appear and the infrared emissivity is high. 7μ
If it is less than m, infrared light having a long wavelength from the base material is transmitted, and the influence of the base material appears.
【０００７】表面側の被膜は、基材の陽極酸化、電気め
っき、無電解めっき、真空蒸着、スパッタリングなどに
より平均膜厚が０.２〜４.０μｍになるように基材に形
成すればよい。材料としては、従来太陽光の主波長であ
る波長０.３〜２.０μｍの光を吸収するものとして用い
られていたもの、例えば、ブラッククロム、ブラックニ
ッケル、亜鉛酸化物、酸化第二銅、ブラックアルミニウ
ム、酸化第二鉄、Ｃｏ−Ｓｎ酸化物、Ｎｉ−Ｓｎ酸化物
などを用いればよい。The film on the front side may be formed on the substrate by anodic oxidation, electroplating, electroless plating, vacuum deposition, sputtering, or the like so that the average film thickness is 0.2 to 4.0 μm. . As a material, a material that has been used as a material that absorbs light having a wavelength of 0.3 to 2.0 μm, which is the main wavelength of sunlight, such as black chrome, black nickel, zinc oxide, cupric oxide, Black aluminum, ferric oxide, Co-Sn oxide, Ni-Sn oxide, or the like may be used.
【０００８】表面側の被膜は、熱吸収性物質の粉末を含
有する塗料を塗装することにより形成することも可能で
ある。この場合、熱吸収性物質としては、可視光線およ
び赤外線を吸収する物質、すなわち、一般に黒色の外観
を呈する物質が用いられる。具体的には黒色顔料である
カ−ボンブラックや、酸化第二鉄、二酸化マンガン、ブ
ラックニッケルなどの遷移元素の酸化物や、黒色の焼成
顔料として用いられるＣｕＣｒ複合酸化物、ＣｕＦｅＭ
ｎ複合酸化物、ＣｕＣｒＭｎ複合酸化物、ＣｏＦｅＭｎ
複合酸化物などの遷移元素の複合酸化物が挙げられる。
また、黒色のセラミックスのＴｉＣ、ＴｉＮ、Ｔｉ
Ｂ2、ＴｉＯ、ＺｒＣなどの粉末も使用できる。樹脂は
有機高分子、無機高分子でもよいが、赤外線吸収の少な
いものが好ましく、例えば、アクリル樹脂、ポリエステ
ル樹脂、シリコ−ン樹脂、フッ素樹脂、ポリオレフィン
樹脂、ポリ塩化ビニル樹脂、ポリエチレンテレフタレ−
ト樹脂、各種天然ゴムおよび合成ゴムなどを使用すれば
よい。被膜の形成は溶剤型塗料や粉体塗料などを塗布す
る方法、フィルムをラミネ−トする方法などによればよ
い。The film on the front side can be formed by applying a paint containing a powder of a heat absorbing substance. In this case, a substance that absorbs visible light and infrared light, that is, a substance that generally has a black appearance is used as the heat-absorbing substance. Specifically, black pigments such as carbon black, oxides of transition elements such as ferric oxide, manganese dioxide and black nickel, CuCr composite oxides used as black fired pigments, CuFeM
n composite oxide, CuCrMn composite oxide, CoFeMn
A transition element composite oxide such as a composite oxide may be used.
In addition, black ceramic TiC, TiN, Ti
Powders such as B 2 , TiO, and ZrC can also be used. The resin may be an organic polymer or an inorganic polymer, but those having low infrared absorption are preferable. For example, acrylic resin, polyester resin, silicone resin, fluorine resin, polyolefin resin, polyvinyl chloride resin, polyethylene terephthalate
Resin, various natural rubbers and synthetic rubbers may be used. The film may be formed by a method of applying a solvent type paint or a powder paint, a method of laminating a film, or the like.
【０００９】裏面側の被膜は、集熱板が太陽熱を吸収し
た場合、温度が８０〜１００℃に達するので、少なくと
も波長４μｍより長い赤外線の放射率の高いことが要求
される。これはセラミックスのような赤外線高放射性材
料を基材の裏面側に焼結したり、ほうろうかけしたりす
ればよいのであるが、これらの方法は集熱板を加工した
後でしか適用できない。When the heat collecting plate absorbs solar heat, the temperature of the film on the back side reaches 80 to 100 ° C., and therefore, it is required that the emissivity of infrared rays having a wavelength longer than at least 4 μm be high. This can be achieved by sintering or enamelling an infrared high-radiation material such as ceramics on the back side of the substrate, but these methods can be applied only after processing the heat collecting plate.
【００１０】そこで、被膜形成後も加工可能な有機高分
子の被膜を形成すればよいのであるが、従来から汎用さ
れている有機高分子の波長が７μｍより長い赤外線放射
率は０.８〜０.９と高いものの、波長が４〜７μｍの場
合、０.３程度と低い。そこで、有機高分子に赤外線高
放射性材料の粉末を添加して、赤外線放射率を高めなけ
ればならない。このような粉末としては、セラミックス
粉末、遷移元素の酸化物または複合酸化物粉末、カ−ボ
ンブラックなどがあり、それらを１種以上添加すればよ
い。具体的には、セラミックス粉末として、ＴｉＣ、Ｔ
ｉＮ、ＴｉＢ2、ＴｉＯ、ＺｒＣなどがあり、遷移元素
の酸化物または複合酸化物粉末としてはＦｅ3Ｏ4、Ｍｎ
Ｏ2、ＣｏＯ、ＣｕＯ、Ｃｒ2Ｏ3、ＮｉＯなどがある。
有機高分子としては表面側の被膜に使用したものを使用
でき、表裏同一のものを使用すると、製造が容易にな
る。Therefore, it is only necessary to form a film of an organic polymer which can be processed even after the film is formed. The infrared emissivity of a conventionally used organic polymer having a wavelength longer than 7 μm is 0.8 to 0. Although it is as high as .9, it is as low as about 0.3 when the wavelength is 4 to 7 μm. Therefore, it is necessary to increase the infrared emissivity by adding a powder of an infrared high-emitting material to the organic polymer. Such powders include ceramic powders, transition element oxide or composite oxide powders, carbon black, and the like, and one or more of these may be added. Specifically, TiC, T
iN, TiB 2 , TiO, ZrC, etc., and as an oxide or composite oxide powder of a transition element, Fe 3 O 4 , Mn
There are O 2 , CoO, CuO, Cr 2 O 3 , NiO and the like.
As the organic polymer, those used for the coating on the front side can be used, and if the same polymer is used on the front and back, the production becomes easy.
【００１１】裏面側の被膜は、表面粗度を大きくする
と、赤外線放射面積が拡大し、放射率を向上させること
ができる。この表面粗度は中心線平均粗さで３μｍ以
上、うねりの平均波長が２００μｍ以下にするのが望ま
しい。表面粗度がこれらの値より小さいと、表面積拡大
が十分でないため、放射率向上効果が得られない。When the surface roughness of the coating on the back side is increased, the infrared radiation area is increased, and the emissivity can be improved. The surface roughness is desirably 3 μm or more in center line average roughness and 200 μm or less in average undulation wavelength. When the surface roughness is smaller than these values, the emissivity cannot be improved because the surface area is not sufficiently increased.
【００１２】基材は、鋼板、銅板、アルミニウム板、ア
ルミニウムめっき鋼板、アルミニウム系合金めっき鋼
板、銅めっき鋼板、錫めっき鋼板、クロムめっき鋼板、
ステンレス鋼板など熱伝導率の高い金属材料を用いるこ
とができる。集熱板を使用する集熱部は水が内部循環す
る構造になっているので、耐食性の良好なめっき鋼板、
ステンレス鋼板、アルミニウム板などにするのが望まし
い。The base material is a steel plate, a copper plate, an aluminum plate, an aluminum-plated steel plate, an aluminum-based alloy-plated steel plate, a copper-plated steel plate, a tin-plated steel plate, a chrome-plated steel plate,
A metal material having high thermal conductivity such as a stainless steel plate can be used. The heat collecting part using a heat collecting plate has a structure in which water circulates inside, so that the plated steel sheet with good corrosion resistance,
It is desirable to use a stainless steel plate, an aluminum plate, or the like.
【００１３】[0013]
【実施例】実施例１ 板厚０.５ｍｍのＳＵＳ４３０ステンレス鋼板の基材に
アルカリ脱脂処理した後、両面に塗布型クロメ−ト処理
液を塗布、乾燥した。そして、平均粒径０.０２μｍの
カ−ボンブラック含有量が５０重量％であるポリエステ
ル樹脂系塗料を表面側、裏面側に塗装し、乾燥した。Example 1 After a base material of a SUS430 stainless steel sheet having a thickness of 0.5 mm was subjected to alkaline degreasing treatment, a coating type chromate treatment solution was applied to both sides and dried. Then, a polyester resin paint having an average particle size of 0.02 μm and a carbon black content of 50% by weight was applied to the front side and the back side, and dried.
【００１４】実施例２〜４ 実施例１において、裏面側にカ−ボンブラック含有量が
実施例１と同じポリエステル樹脂系縮み塗料を塗装し、
表面粗度を大きくした。Examples 2 to 4 In Example 1, a polyester resin shrinkage paint having the same carbon black content as in Example 1 was applied to the back side,
The surface roughness was increased.
【００１５】実施例５〜９ 実施例１において、表面側に塗装する塗料を平均粒径
０.２μｍで、組成がＦｅ2Ｏ3−ＭｎＯ2−ＣｕＯである
黒色焼成顔料の含有量が５０重量％であるポリエステル
樹脂系塗料に変更し、裏面側に塗装する塗料も顔料の種
類、配合量が同じポリエステル樹脂系縮み塗料に変更し
た。Examples 5 to 9 In Example 1, the coating material to be coated on the surface side was prepared by adding 50% by weight of a black fired pigment having an average particle size of 0.2 μm and a composition of Fe 2 O 3 —MnO 2 —CuO. %, And the paint to be applied on the back side was also changed to a polyester resin-based shrink paint having the same pigment type and blending amount.
【００１６】実施例１０ 実施例１において、表面側と裏面側に塗装する塗料を平
均粒径０.３μｍのＴｉＣセラミックス粉末含有量が５
０重量％であるポリエステル樹脂系塗料に変更した。Example 10 In Example 1, the paint to be applied on the front side and the back side was prepared by adding a TiC ceramic powder having an average particle diameter of 0.3 μm to a content of 5%.
It was changed to a polyester resin paint which was 0% by weight.
【００１７】実施例１１ 実施例１において、表面側に塗装する塗料を平均粒径
０.０２μｍのカ−ボンブラック２０重量％と平均粒径
０.２μｍで、組成がＦｅ2Ｏ3−ＭｎＯ2−ＣｕＯである
黒色焼成顔料を３０重量％含有する塗料に変更するとと
もに、裏面側に塗装する塗料も顔料の種類、配合量が同
じポリエステル樹脂系縮み塗料に変更した。Example 11 In Example 1, the coating material to be coated on the front side was prepared by adding 20% by weight of carbon black having an average particle diameter of 0.02 μm, an average particle diameter of 0.2 μm, and a composition of Fe 2 O 3 —MnO 2. The paint was changed to a paint containing 30% by weight of a black fired pigment of CuO, and the paint applied to the back side was also changed to a polyester resin shrink paint having the same pigment type and blending amount.
【００１８】実施例１２ 実施例１において、表面側に塗装する塗料を平均粒径
０.２μｍで、組成がＦｅ2Ｏ3−ＭｎＯ2−ＣｕＯの黒色
焼成顔料３０重量％と平均粒径０.３μｍのＴｉＣセラ
ミックス粉末２０重量％とを含有する塗料に変更すると
ともに、裏面側に塗装する塗料も顔料の種類、配合量が
同じポリエステル樹脂系縮み塗料に変更した。Example 12 In Example 1, the coating material to be coated on the surface side had an average particle size of 0.2 μm, a composition of 30% by weight of a black calcined pigment of Fe 2 O 3 —MnO 2 —CuO and an average particle size of 0.3%. The paint was changed to a paint containing 20% by weight of 3 μm TiC ceramic powder, and the paint applied to the back side was changed to a polyester resin shrink paint having the same pigment type and blending amount.
【００１９】実施例１３ 板厚０.６ｍｍのアルミニウム板にアルカリ脱脂処理し
た後、リン酸クロメ−ト処理、塗布型クロメ−ト処理を
順次施して、表面側と裏面側に平均粒径０.２μｍで、
組成がＦｅ2Ｏ3−ＭｎＯ2−ＣｕＯである黒色焼成顔料
の含有量が５０重量％であるポリエステル樹脂系塗料を
塗装し、乾燥した。Example 13 An aluminum plate having a thickness of 0.6 mm was subjected to alkaline degreasing treatment, followed by phosphoric acid chromate treatment and coating type chromate treatment in order to obtain an average particle diameter of 0.8 on the front side and the back side. At 2 μm,
Composition content of the black calcined pigment is Fe 2 O 3 -MnO 2 -CuO is painted a polyester resin-based paint is a 50% by weight, and dried.
【００２０】実施例１４ 実施例１３において、基材を板厚０.５ｍｍの溶融アル
ミニウムめっき鋼板で、アルカリ脱脂処理後リン酸クロ
メ−ト処理を施したものに変更した。Example 14 In Example 13, the base material was changed to a hot-dip aluminum-plated steel sheet having a thickness of 0.5 mm, which was subjected to a phosphoric acid chromating treatment after an alkali degreasing treatment.
【００２１】実施例１５ 実施例１において、表面側に塗装する塗料を平均粒径
０.２μｍで、組成がＦｅ2Ｏ3−ＭｎＯ2−ＣｕＯである
黒色焼成顔料の含有量が５０重量％であるポリエステル
樹脂系塗料に変更するとともに、裏面側に塗装する塗料
も平均粒径が０.１μｍであるＴｉＯ2粉末を５０重量％
含有するポリエステル樹脂系縮み塗料に変更した。Example 15 In Example 1, the coating material to be coated on the surface side was prepared by adding a black fired pigment having an average particle size of 0.2 μm and a composition of Fe 2 O 3 —MnO 2 —CuO to 50% by weight. In addition to changing to a certain polyester resin-based paint, the paint to be applied on the back side is also made of 50% by weight of TiO 2 powder having an average particle size of 0.1 μm.
Changed to shrink paint containing polyester resin.
【００２２】[0022]
【従来例】実施例１において、表面側に塗装する塗料を
平均粒径０.２μｍで、組成がＦｅ2Ｏ3−ＭｎＯ2−Ｃｕ
Ｏである黒色焼成顔料の含有量が５０重量％であるポリ
エステル樹脂系塗料に変更し、裏面側は無塗装にした。Conventional Example In Example 1, a coating material to be coated on the surface side was made of Fe 2 O 3 —MnO 2 —Cu
The content of the black fired pigment, which was O, was changed to a polyester resin paint having a content of 50% by weight, and the back side was left uncoated.
【００２３】[0023]
【比較例】比較例１ 実施例１において、表面側に塗装する塗料を平均粒径
０.２μｍで、組成がＦｅ2Ｏ3−ＭｎＯ2−ＣｕＯである
黒色焼成顔料の含有量が５０重量％であるポリエステル
樹脂系塗料に変更するとともに、裏面側に塗装する塗料
も顔料配合が同じポリエステル樹脂系縮み塗料に変更し
て、表面側の乾燥塗膜厚を６μｍにした。Comparative Example 1 Comparative Example 1 was repeated except that the content of the black fired pigment having a mean particle size of 0.2 μm and a composition of Fe 2 O 3 —MnO 2 —CuO was 50% by weight. And the paint applied on the back side was also changed to a polyester resin-based shrink paint having the same pigment composition, so that the dry film thickness on the front side was 6 μm.
【００２４】比較例２ 比較例１において、裏面側の乾燥塗膜厚を５μｍに変更
した。Comparative Example 2 In Comparative Example 1, the thickness of the dry coating on the back side was changed to 5 μm.
【００２５】表１に実施例１〜１５、従来例、比較例１
〜２で製造した集熱板の塗膜を示す。また、表２に集熱
板の表面側での日射吸収率、赤外線放射率と、裏面側で
の赤外線放射率を示す。なお、日射吸収率はＪＩＳ Ａ
５７５９に規定する窓ガラス用フィルムに準拠して分
光光度計を用いて分光反射率を測定した後、日射分光分
布で加重平均した日射反射率を求め、（１００−日射反
射率）を日射吸収率とした。赤外線放射率は放射率計
（Devices & Services社製AERD型）を用いて波長３〜３
０μｍの範囲の放射率を測定して、赤外線放射率とし
た。これらの結果を表２に示す。Table 1 shows Examples 1 to 15, Conventional Example and Comparative Example 1.
2 shows a coating film of a heat collecting plate manufactured in Nos. 1 to 2. Table 2 shows the solar radiation absorptance and infrared emissivity on the front side of the heat collecting plate and the infrared emissivity on the back side. The solar absorptivity is based on JIS A
After measuring the spectral reflectance using a spectrophotometer in accordance with the window glass film specified in 5759, the solar reflectance was obtained by weighted averaging with the solar spectral distribution, and (100-solar reflectance) was calculated as the solar absorptance. And Infrared emissivity was measured using an emissivity meter (Devices & Services AERD type) at a wavelength of 3 to 3
The emissivity in the range of 0 μm was measured and defined as infrared emissivity. Table 2 shows the results.
【００２６】[0026]
【表１】 （注１）膜厚は平均膜厚である。 （注２）裏面側の粗さは中心線平均粗さで、波長はうね
りの平均波長である。[Table 1] (Note 1) The film thickness is an average film thickness. (Note 2) The roughness on the back side is the center line average roughness, and the wavelength is the average wavelength of the undulation.
【００２７】[0027]
【表２】 [Table 2]
【００２８】[0028]
【発明の効果】以上のように、金属基材の表面側に太陽
光の主波長である波長０.３〜２.０μｍの可視光線と近
赤外線を吸収可能で、平均膜厚が０.２〜４.０μｍの被
膜が形成された太陽熱集熱板において、裏面側に平均膜
厚が７μｍ以上の被膜を形成すると、裏面側からの赤外
線放射率が大きくなり、熱伝播での熱損失を少なくする
ことができる。As described above, visible light and near-infrared light having a wavelength of 0.3 to 2.0 μm, which is the main wavelength of sunlight, can be absorbed on the surface side of the metal substrate, and the average film thickness is 0.2. When a film having an average film thickness of 7 μm or more is formed on the back surface side of the solar heat collecting plate having a film thickness of ~ 4.0 μm, the infrared emissivity from the back surface increases, and heat loss due to heat propagation is reduced. can do.
【図１】太陽熱温水器において、太陽熱集熱板から熱媒
体への熱伝播が赤外線放射方式である集熱部の断面図で
ある。FIG. 1 is a cross-sectional view of a heat collecting unit in a solar water heater in which heat is transmitted from a solar heat collecting plate to a heat medium by an infrared radiation method.
１ 太陽熱集熱板 ２ 熱媒体 ３ 空間 1 Solar heat collecting plate 2 Heat medium 3 Space
───────────────────────────────────────────────────── フロントページの続き (72)発明者 圓谷 浩 千葉県市川市高谷新町７番地の１ 日新製 鋼株式会社技術研究所塗装・複合材料研究 部内 Ｆターム(参考） 4K044 AA02 AA03 AA06 AB02 AB10 BA02 BA06 BA10 BA12 BA15 BA17 BA18 BA21 BB03 BB04 BB09 BB11 BB16 BC00 BC12 CA04 CA11 CA16 CA18 CA53 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroshi Enya 1-7-1, Takatani-shinmachi, Ichikawa-shi, Chiba F-term (reference) 4N044 AA02 AA03 AA06 AB02 AB10 BA02 BA06 BA10 BA12 BA15 BA17 BA18 BA21 BB03 BB04 BB09 BB11 BB16 BC00 BC12 CA04 CA11 CA16 CA18 CA53
Claims (3)
ある波長０.３〜２.０μｍの可視光線と近赤外線を吸収
可能で、平均膜厚が０.２〜４.０μｍの被膜が形成さ
れ、裏面側には平均膜厚が７μｍ以上の被膜が形成され
ていることを特徴とする太陽熱集熱板。1. A metal substrate capable of absorbing visible light and near infrared light having a wavelength of 0.3 to 2.0 μm, which is the main wavelength of sunlight, and having an average film thickness of 0.2 to 4.0 μm. A solar heat collecting plate, wherein a film is formed, and a film having an average film thickness of 7 μm or more is formed on the back surface side.
移元素の酸化物または複合酸化物、ＴｉＣ、ＴｉＮ、Ｔ
ｉＢ2、ＴｉＯ、ＺｒＣから選ばれた１種または２種以
上を含有することを特徴とする請求項１に記載の太陽熱
集熱板。2. The coating on the surface side is made of carbon black, oxide or composite oxide of transition element, TiC, TiN, T
iB 2, TiO, solar heat collector plate according to claim 1, characterized in that it contains one or more selected from ZrC.
粗さで３μｍ以上、うねりの平均波長が２００μｍ以下
であることを特徴とする請求項１に記載の太陽熱集熱
板。3. The solar heat collecting plate according to claim 1, wherein the coating on the back side has a surface roughness of 3 μm or more in center line average roughness and an average wavelength of undulation of 200 μm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27823299A JP2001099497A (en) | 1999-09-30 | 1999-09-30 | Solar heat collecting plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27823299A JP2001099497A (en) | 1999-09-30 | 1999-09-30 | Solar heat collecting plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001099497A true JP2001099497A (en) | 2001-04-13 |
Family
ID=17594472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27823299A Withdrawn JP2001099497A (en) | 1999-09-30 | 1999-09-30 | Solar heat collecting plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001099497A (en) |
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