WO2015129838A1 - Sic honeycomb as heat transfer material for molten salt eutectic mixture involving phase change - Google Patents

Sic honeycomb as heat transfer material for molten salt eutectic mixture involving phase change Download PDF

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WO2015129838A1
WO2015129838A1 PCT/JP2015/055733 JP2015055733W WO2015129838A1 WO 2015129838 A1 WO2015129838 A1 WO 2015129838A1 JP 2015055733 W JP2015055733 W JP 2015055733W WO 2015129838 A1 WO2015129838 A1 WO 2015129838A1
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heat storage
molten salt
heat
heat transfer
sic
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PCT/JP2015/055733
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French (fr)
Japanese (ja)
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裕昭 桐木
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イビデン株式会社
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
    • F28D20/023—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material being enclosed in granular particles or dispersed in a porous, fibrous or cellular structure
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/0006—Honeycomb structures
    • C04B38/0012—Honeycomb structures characterised by the material used for sealing or plugging (some of) the channels of the honeycombs
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/02—Materials undergoing a change of physical state when used
    • C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
    • C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/04—Constructions of heat-exchange apparatus characterised by the selection of particular materials of ceramic; of concrete; of natural stone
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

Definitions

  • the present invention relates to a heat storage technique and a heat storage material.
  • the technology for storing and using solar heat, waste heat, etc. is used in various fields.
  • the technique of storing heat using the phase change of a material is attracting attention as a technique for storing a large amount of heat because a large latent heat is required in accordance with the phase change.
  • Patent Document 1 as a heat storage tank applicable to a hot water supply or heating system using solar heat, in a heat storage tank in which a top portion and a pipe for introducing or sending out a heat medium are arranged, the heat storage tank extends in the vertical direction.
  • a heat storage tank has been proposed.
  • a heat storage tank using latent heat has a problem in heat transfer when the heat storage body is in a solid state.
  • heat exchange is performed using the flow of the heat medium, but the heat storage capacity is reduced by the amount of space required for the heat medium to pass through the volume of the entire heat storage tank.
  • molten salt which is a eutectic mixture with phase change, is used as a heat storage material using latent heat in solar thermal power generation facilities and the like.
  • the molten salt melts and causes natural convection in a wide area within the container. This natural convection occurs everywhere when designing the heat storage container, so it is difficult to predict the necessary heat storage time in consideration of the heat transfer coefficient in advance.
  • the present invention aims to solve the problems of conventional heat storage materials and provide a heat storage technology and a heat storage material that can easily predict the time required for heat storage.
  • the heat storage material of the present invention for solving the above problems is to use a SiC honeycomb as a heat transfer control material of a molten salt which is a eutectic mixture accompanied by a phase change.
  • the heat storage material of the present invention is preferably composed of the SiC honeycomb and a molten salt.
  • control can be performed so that only natural convection occurs in a narrow region between the SiC honeycombs even during heat storage.
  • the increase in the heat transfer coefficient due to natural convection is added to the heat conductivity of the molten salt and SiC honeycomb mixture, so The influence of convection can be reduced.
  • the heat transfer coefficient in the molten salt can be designed using a commercially available simulation software, such as the necessary heat storage time of the heat storage container. That is, if an SiC honeycomb is used, the heat transfer coefficient of the molten salt It can be said that can be controlled.
  • the magnitude of the heat storage amount shown in the present specification indicates the magnitude of the latent heat of fusion when the entire phase changes from a liquid phase to a solid.
  • the heat storage material of the present invention uses a SiC honeycomb as a heat transfer control material for molten salt, which is a eutectic mixture with phase change.
  • the SiC honeycomb is a member made of SiC and having holes in a honeycomb shape.
  • the size of the member is not particularly limited, and is, for example, 30 mm ⁇ 30 mm ⁇ 150 mm, 100 mm ⁇ 100 mm ⁇ 1000 mm.
  • the size and shape of the hole are not particularly limited.
  • a square or a rectangle can be used, and the cross-sectional size of the hole is, for example, a square or a regular hexagon with a side length of 1 to 10 mm.
  • Molten salt which is a eutectic mixture with phase change, is used as a heat storage material in solar thermal power generation facilities and the like.
  • the molten salt melts and causes natural convection in a wide area within the container. This natural convection occurs everywhere when designing the heat storage container, so it is difficult to predict the necessary heat storage time in consideration of the heat transfer coefficient in advance. This is because it is difficult to obtain the heat transfer coefficient by natural convection with commercially available simulation software because the boundary condition changes.
  • the SiC honeycomb is crushed into small pieces and mixed with the molten salt so as to be about 30% by weight, so that only natural convection occurs in a narrow region between the SiC honeycombs even during heat storage. be able to.
  • a molten salt that is a eutectic mixture with phase change is a mixture having a common point in the phase diagram.
  • the heat storage material of the present invention is preferably composed of the SiC honeycomb and a molten salt.
  • the mixture of the SiC honeycomb and the molten salt hardly causes a convection phenomenon only in a region where the molten salt is narrow.
  • the increase in heat transfer coefficient due to natural convection is added to the thermal conductivity of the mixture of molten salt and SiC honeycomb. The effect of natural convection on heat transfer can be reduced.
  • the heat storage material of the present invention is to use a SiC honeycomb.
  • the reason why SiC is used instead of powder or plate is to prevent separation by gravity, and it is easy to uniformly mix and fill molten salt and SiC honeycomb in a large-scale heat accumulator.
  • the shape of the SiC honeycomb is not particularly limited, and may be used after being crushed into small pieces.
  • Example 1 according to the present invention will be described below.
  • a heat storage material composed of a molten salt that is a eutectic mixture with phase change and a SiC honeycomb is filled into a container having an internal volume of 10 m 3 .
  • the molten salt is a mixture of KNO 3 and NaNO 3 .
  • the weight ratio of the heat storage material is 35% by weight for KNO 3 , 35% by weight for NaNO 3 and 30% by weight for SiC honeycomb.
  • the SiC honeycomb is packed in the container without any gap, and the molten salt that is a eutectic mixture accompanied with phase change is packed in the void portion of the honeycomb.
  • the molten molten salt is impeded by the convection by the honeycomb, and the heat transfer by convection is much smaller than the heat conduction of the SiC honeycomb, and can be easily stored by heat transfer calculation only by the heat conduction of the SiC honeycomb. Can be calculated.
  • the convection phenomenon is hardly involved, the difference between the experimental value and the simulation is not likely to deviate even when scaled up, and the time required for heat storage can be easily predicted.
  • the molten salt is a mixture of KNO 3 and NaNO 3 .
  • the weight ratio of the heat storage material is 50% by weight for KNO 3 and 50% by weight for NaNO 3 . That is, the container is filled only with a molten salt that is a eutectic mixture with a phase change.
  • the molten salt begins to convect everywhere.
  • the time required for melting varies depending on the location of convection and is difficult to predict. Also, since the convection momentum appears more prominently as the size of the container increases, the difference between the experimental value and the simulation tends to deviate even when scaled up, making it difficult to predict the time required for heat storage. is there.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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Abstract

[Problem] To provide a heat storage technique and heat storage material whereby the time needed for heat storage is easily predicted. [Solution] A heat storage material in which a SiC honeycomb is used as a heat transfer material for a molten salt eutectic mixture involving a phase change. By mixing a SiC honeycomb in the molten salt, control can be performed so that only natural convection occurs in narrow regions between SiC honeycombs even during heat storage. In predicting the time needed for heat storage in the case of natural convection in the narrow regions, the effect of natural convection on the movement of heat can be reduced by adding the increase in the heat transfer coefficient due to natural convection to the heat transfer coefficient of the molten salt and SiC honeycomb mixture.

Description

相変化を伴う共融混合物である溶融塩の熱伝達制御材としてのＳｉＣハニカムSiC honeycomb as a heat transfer control material for molten salt, eutectic mixture with phase change
　本発明は、蓄熱技術および蓄熱材に関する。 The present invention relates to a heat storage technique and a heat storage material.
　太陽熱、廃熱などを蓄熱し、利用する技術は様々な分野で利用されている。物質の相変化を利用し蓄熱する技術は、相変化に伴って大きな潜熱が必要であることから大きな熱量を蓄える技術として注目されている。 The technology for storing and using solar heat, waste heat, etc. is used in various fields. The technique of storing heat using the phase change of a material is attracting attention as a technique for storing a large amount of heat because a large latent heat is required in accordance with the phase change.
　特許文献１には、太陽熱を利用した給湯、暖房システムなどに適用可能な蓄熱槽として、頂部および熱媒の導入あるいは送出用のパイプを配設してなる蓄熱槽において、蓄熱槽の上下方向にわたって平板状をした容器を複数段棚状に積層すると共に、この容器内には潜熱を利用した蓄熱体を充填し、更に容器には熱媒が流動するための通水路を特徴とする潜熱を利用した蓄熱槽が提案されている。 In Patent Document 1, as a heat storage tank applicable to a hot water supply or heating system using solar heat, in a heat storage tank in which a top portion and a pipe for introducing or sending out a heat medium are arranged, the heat storage tank extends in the vertical direction. Laminates flat containers in a multi-tiered shelf, fills the container with heat storage using latent heat, and uses the latent heat characterized by a water passage for the heat medium to flow in the container. A heat storage tank has been proposed.
特開昭５０－１２４２３６号公報JP 50-124236 A
　一般に潜熱を利用した蓄熱槽は、蓄熱体が固体の状態にあるときの伝熱性に問題がある。特許文献１では、熱媒の流動を利用し熱交換を行っているが、蓄熱槽全体の容積に対し熱媒を通過させるための空間を要する分、蓄熱容量が低下する。 Generally, a heat storage tank using latent heat has a problem in heat transfer when the heat storage body is in a solid state. In Patent Document 1, heat exchange is performed using the flow of the heat medium, but the heat storage capacity is reduced by the amount of space required for the heat medium to pass through the volume of the entire heat storage tank.
　一方、近年大規模な太陽熱発電での蓄熱技術の利用が検討されている。
　相変化を伴う共融混合物である溶融塩は、太陽熱発電設備等で、潜熱を利用した蓄熱材として用いられる。溶融塩のみを蓄熱材として用いた４ＭＷ・ｈｒクラスの大型蓄熱容器を設計する際、溶融塩は融解し、容器内の広い領域で自然対流を起こす。蓄熱容器の設計時、この自然対流はあらゆる箇所で起こるため、前以て、熱伝達率を考慮して必要な蓄熱時間等を予測することは困難である。 On the other hand, in recent years, the use of heat storage technology in large-scale solar thermal power generation has been studied.
Molten salt, which is a eutectic mixture with phase change, is used as a heat storage material using latent heat in solar thermal power generation facilities and the like. When designing a large-scale heat storage container of 4 MW · hr class using only molten salt as a heat storage material, the molten salt melts and causes natural convection in a wide area within the container. This natural convection occurs everywhere when designing the heat storage container, so it is difficult to predict the necessary heat storage time in consideration of the heat transfer coefficient in advance.
　本発明では、従来の蓄熱材の課題を解決し、蓄熱に必要な時間の予測が容易な蓄熱技術および蓄熱材を提供することを目的とする。 The present invention aims to solve the problems of conventional heat storage materials and provide a heat storage technology and a heat storage material that can easily predict the time required for heat storage.
　上記課題を解決するための本発明の蓄熱材は、相変化を伴う共融混合物である溶融塩の熱伝達制御材としてＳｉＣハニカムを利用することにある。 The heat storage material of the present invention for solving the above problems is to use a SiC honeycomb as a heat transfer control material of a molten salt which is a eutectic mixture accompanied by a phase change.
　また、本発明の蓄熱材は、前記ＳｉＣハニカムと溶融塩とからなることが好ましい。 Further, the heat storage material of the present invention is preferably composed of the SiC honeycomb and a molten salt.
　ＳｉＣハニカムを溶融塩に混合することで、蓄熱時でもＳｉＣハニカム間の狭い領域での自然対流のみしか起こらないように、制御することができる。狭い領域での自然対流の場合、蓄熱に要する時間を予測するには、自然対流による熱伝達率の増加分を、溶融塩とＳｉＣハニカム混合物の熱伝導率に加えることで、熱移動に占める自然対流の影響を少なくすることができる。このため、溶融塩内の熱伝達率として、市販のシミュレーションソフトウエアを用いて、蓄熱容器の必要な蓄熱時間等の設計が可能になる、つまり、ＳｉＣハニカムを用いれば、溶融塩の熱伝達率を制御することができると言える。 By mixing the SiC honeycomb with the molten salt, control can be performed so that only natural convection occurs in a narrow region between the SiC honeycombs even during heat storage. In the case of natural convection in a narrow area, in order to predict the time required for heat storage, the increase in the heat transfer coefficient due to natural convection is added to the heat conductivity of the molten salt and SiC honeycomb mixture, so The influence of convection can be reduced. For this reason, the heat transfer coefficient in the molten salt can be designed using a commercially available simulation software, such as the necessary heat storage time of the heat storage container. That is, if an SiC honeycomb is used, the heat transfer coefficient of the molten salt It can be said that can be controlled.
　以下、本発明の実施の形態を説明する。
　本明細書において示す蓄熱量の大きさは、全体が液相から固体に相変化する際の融解潜熱の大きさを示している。 Embodiments of the present invention will be described below.
The magnitude of the heat storage amount shown in the present specification indicates the magnitude of the latent heat of fusion when the entire phase changes from a liquid phase to a solid.
　本発明の蓄熱材は、相変化を伴う共融混合物である溶融塩の熱伝達制御材としてＳｉＣハニカムを利用する。ＳｉＣハニカムとは、ＳｉＣからなるハニカム状に孔のあいた部材である。部材の大きさは、特に限定されず、例えば３０ｍｍ×３０ｍｍ×１５０ｍｍ、１００ｍｍ×１００ｍｍ×１０００ｍｍの大きさである。 The heat storage material of the present invention uses a SiC honeycomb as a heat transfer control material for molten salt, which is a eutectic mixture with phase change. The SiC honeycomb is a member made of SiC and having holes in a honeycomb shape. The size of the member is not particularly limited, and is, for example, 30 mm × 30 mm × 150 mm, 100 mm × 100 mm × 1000 mm.
　また、前記孔の大きさ、形状は、特に限定されない。形状は例えば正方形、長方形、が利用でき、孔の断面の大きさは、例えば辺の長さが１～１０ｍｍの正方形、正六角形である。 Further, the size and shape of the hole are not particularly limited. For example, a square or a rectangle can be used, and the cross-sectional size of the hole is, for example, a square or a regular hexagon with a side length of 1 to 10 mm.
　相変化を伴う共融混合物である溶融塩は、太陽熱発電設備等で、蓄熱材として用いられる。溶融塩のみを蓄熱材として用いた４ＭＷ・ｈｒクラスの大型蓄熱容器を設計する際、溶融塩は融解し、容器内の広い領域で自然対流を起こす。蓄熱容器の設計時、この自然対流はあらゆる箇所で起こるため、前以て、熱伝達率を考慮して必要な蓄熱時間等を予測することは困難である。それは、境界条件が移動変化するので市販のシミュレーションソフトウエアで自然対流による熱伝達率をもとめることが困難であるためである。しかし、例えばＳｉＣハニカムを小片状に破砕して約３０重量％となるよう溶融塩に混合することで、蓄熱時でもＳｉＣハニカム間の狭い領域での自然対流のみしか起こらないように、制御することができる。 Molten salt, which is a eutectic mixture with phase change, is used as a heat storage material in solar thermal power generation facilities and the like. When designing a large-scale heat storage container of 4 MW · hr class using only molten salt as a heat storage material, the molten salt melts and causes natural convection in a wide area within the container. This natural convection occurs everywhere when designing the heat storage container, so it is difficult to predict the necessary heat storage time in consideration of the heat transfer coefficient in advance. This is because it is difficult to obtain the heat transfer coefficient by natural convection with commercially available simulation software because the boundary condition changes. However, for example, the SiC honeycomb is crushed into small pieces and mixed with the molten salt so as to be about 30% by weight, so that only natural convection occurs in a narrow region between the SiC honeycombs even during heat storage. be able to.
　相変化を伴う共融混合物である溶融塩とは、相図に共有点を有する混合物である。 A molten salt that is a eutectic mixture with phase change is a mixture having a common point in the phase diagram.
　また、本発明の蓄熱材は、前記ＳｉＣハニカムと溶融塩とからなることが好ましい。前記ＳｉＣハニカムと溶融塩との混合物は、溶融塩が狭い領域のみしか対流現象を起こしにくい。溶融塩の狭い領域での自然対流であれば、蓄熱に要する時間を予測するには、自然対流による熱伝達率の増加分を、溶融塩とＳｉＣハニカムとの混合物の熱伝導率に加えることで、熱移動に占める自然対流の影響を少なくすることができる。このため、溶融塩内の熱伝達率として、市販のＦｌｕｅｎｔ（アンシス・インコーポレイテッドの登録商標）等のシミュレーションソフトウエアを用いて、蓄熱容器の必要な蓄熱時間等の設計が可能になる、つまり、ＳｉＣハニカムを用いれば、溶融塩の熱伝達率を制御することができると言える。 Further, the heat storage material of the present invention is preferably composed of the SiC honeycomb and a molten salt. The mixture of the SiC honeycomb and the molten salt hardly causes a convection phenomenon only in a region where the molten salt is narrow. In the case of natural convection in a narrow area of molten salt, in order to predict the time required for heat storage, the increase in heat transfer coefficient due to natural convection is added to the thermal conductivity of the mixture of molten salt and SiC honeycomb. The effect of natural convection on heat transfer can be reduced. For this reason, as a heat transfer coefficient in the molten salt, it becomes possible to design a necessary heat storage time of the heat storage container using simulation software such as commercially available Fluent (registered trademark of Ansys Incorporated), that is, It can be said that the heat transfer coefficient of the molten salt can be controlled by using the SiC honeycomb.
　また、本発明の蓄熱材は、ＳｉＣハニカムを利用することにある。ＳｉＣを粉末状や板状でなく、ハニカムを用いたのは重力による分離を防ぎ、大型蓄熱器に溶融塩とＳｉＣハニカムを均一に混合充填するのが容易であるためである。ＳｉＣハニカムの形状は特に限定されず小片に破砕して用いてもよい。 Also, the heat storage material of the present invention is to use a SiC honeycomb. The reason why SiC is used instead of powder or plate is to prevent separation by gravity, and it is easy to uniformly mix and fill molten salt and SiC honeycomb in a large-scale heat accumulator. The shape of the SiC honeycomb is not particularly limited, and may be used after being crushed into small pieces.
＜実施例１＞
　以下に、本発明に係る実施例１について説明する。
　相変化を伴う共融混合物である溶融塩、ＳｉＣハニカムとからなる蓄熱材を内容積が、１０ｍ３の容器に充填する。溶融塩はＫＮＯ３とＮａＮＯ３との混合物である。蓄熱材の重量比は、ＫＮＯ３が３５重量％、ＮａＮＯ３が３５重量％、ＳｉＣハニカムが３０重量％である。ＳｉＣハニカムは、容器に隙間なく詰められ、ハニカムの空隙部分に相変化を伴う共融混合物である溶融塩が詰められている。 <Example 1>
Example 1 according to the present invention will be described below.
A heat storage material composed of a molten salt that is a eutectic mixture with phase change and a SiC honeycomb is filled into a container having an internal volume of 10 m 3 . The molten salt is a mixture of KNO 3 and NaNO 3 . The weight ratio of the heat storage material is 35% by weight for KNO 3 , 35% by weight for NaNO 3 and 30% by weight for SiC honeycomb. The SiC honeycomb is packed in the container without any gap, and the molten salt that is a eutectic mixture accompanied with phase change is packed in the void portion of the honeycomb.
　このような蓄熱材は、溶融した溶融塩が、ハニカムによって対流が阻害され、対流による伝熱はＳｉＣハニカムの熱伝導より圧倒的に小さく、ＳｉＣハニカムの熱伝導のみによる伝熱計算により容易に蓄熱に要する時間を算出できる。また、対流現象がほとんど関与しないので実験値とシミュレーションとの差異は、スケールアップしても乖離しにくく、蓄熱に要する時間を容易に予測することができる。 In such a heat storage material, the molten molten salt is impeded by the convection by the honeycomb, and the heat transfer by convection is much smaller than the heat conduction of the SiC honeycomb, and can be easily stored by heat transfer calculation only by the heat conduction of the SiC honeycomb. Can be calculated. In addition, since the convection phenomenon is hardly involved, the difference between the experimental value and the simulation is not likely to deviate even when scaled up, and the time required for heat storage can be easily predicted.
＜比較例１＞
　以下に、比較例１について説明する。
　相変化を伴う共融混合物である溶融塩からなる蓄熱材を内容積が、１０ｍ３の容器に充填する。溶融塩はＫＮＯ３とＮａＮＯ３との混合物である。蓄熱材の重量比は、ＫＮＯ３が５０重量％、ＮａＮＯ３が５０重量％である。すなわち、容器には、相変化を伴う共融混合物である溶融塩のみが詰められている。 <Comparative Example 1>
Below, the comparative example 1 is demonstrated.
A heat storage material made of a molten salt, which is a eutectic mixture with phase change, is filled in a container having an internal volume of 10 m 3 . The molten salt is a mixture of KNO 3 and NaNO 3 . The weight ratio of the heat storage material is 50% by weight for KNO 3 and 50% by weight for NaNO 3 . That is, the container is filled only with a molten salt that is a eutectic mixture with a phase change.
　このような蓄熱材は、溶融した溶融塩が、あらゆる箇所で対流を始める。溶融にかかる時間は対流の発生箇所によって変動し、予測が困難である。また、対流の勢いは、容器の大きさが大きくなるにつれてより顕著に現れるので、実験値とシミュレーションとの差異は、スケールアップしても乖離しやすく、蓄熱に要する時間を予測することが困難である。 In such a heat storage material, the molten salt begins to convect everywhere. The time required for melting varies depending on the location of convection and is difficult to predict. Also, since the convection momentum appears more prominently as the size of the container increases, the difference between the experimental value and the simulation tends to deviate even when scaled up, making it difficult to predict the time required for heat storage. is there.

Claims (2)

  1. 　相変化を伴う共融混合物である溶融塩の熱伝達制御材であることを特徴とするＳｉＣハニカム。 A SiC honeycomb characterized by being a heat transfer control material for molten salt, which is a eutectic mixture with phase change.
  2. 　前記ＳｉＣハニカムと溶融塩とからなることを特徴とする蓄熱材。 A heat storage material comprising the SiC honeycomb and a molten salt.
PCT/JP2015/055733 2014-02-28 2015-02-27 Sic honeycomb as heat transfer material for molten salt eutectic mixture involving phase change WO2015129838A1 (en)

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Publication number Priority date Publication date Assignee Title
CN113773106A (en) * 2021-08-11 2021-12-10 吉林大学 Bionic self-repairing heat storage composite material and preparation method thereof

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JPS61261388A (en) * 1985-05-15 1986-11-19 Nippon Denso Co Ltd Heat storing apparatus
JPH0297895A (en) * 1988-10-03 1990-04-10 Agency Of Ind Science & Technol Heat accumulator
JPH05306389A (en) * 1992-04-28 1993-11-19 Takashi Nishigori Thermal storage material
JP2001012804A (en) * 1999-06-29 2001-01-19 Energy Support Corp Method for filling heat storage material
JP2003502614A (en) * 1999-06-18 2003-01-21 イエダ・リサーチ・アンド・デベロツプメント・カンパニー・リミテツド Safety system that accumulates high-temperature heat

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Publication number Priority date Publication date Assignee Title
JPS61261388A (en) * 1985-05-15 1986-11-19 Nippon Denso Co Ltd Heat storing apparatus
JPH0297895A (en) * 1988-10-03 1990-04-10 Agency Of Ind Science & Technol Heat accumulator
JPH05306389A (en) * 1992-04-28 1993-11-19 Takashi Nishigori Thermal storage material
JP2003502614A (en) * 1999-06-18 2003-01-21 イエダ・リサーチ・アンド・デベロツプメント・カンパニー・リミテツド Safety system that accumulates high-temperature heat
JP2001012804A (en) * 1999-06-29 2001-01-19 Energy Support Corp Method for filling heat storage material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113773106A (en) * 2021-08-11 2021-12-10 吉林大学 Bionic self-repairing heat storage composite material and preparation method thereof

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