EP3430103A1 - Procédé de fabrication d'un régulateur thermique à changement d'état et régulateur thermique à changement d'état - Google Patents

Procédé de fabrication d'un régulateur thermique à changement d'état et régulateur thermique à changement d'état

Info

Publication number
EP3430103A1
EP3430103A1 EP17709427.3A EP17709427A EP3430103A1 EP 3430103 A1 EP3430103 A1 EP 3430103A1 EP 17709427 A EP17709427 A EP 17709427A EP 3430103 A1 EP3430103 A1 EP 3430103A1
Authority
EP
European Patent Office
Prior art keywords
phase change
mold
change material
starting material
shaped body
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Withdrawn
Application number
EP17709427.3A
Other languages
German (de)
English (en)
Inventor
Günter Rinn
Klaus Reiser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schunk Carbon Technology GmbH
Schunk Kohlenstofftechnik GmbH
Original Assignee
Schunk Carbon Technology GmbH
Schunk Kohlenstofftechnik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schunk Carbon Technology GmbH, Schunk Kohlenstofftechnik GmbH filed Critical Schunk Carbon Technology GmbH
Publication of EP3430103A1 publication Critical patent/EP3430103A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • F28F21/02—Constructions of heat-exchange apparatus characterised by the selection of particular materials of carbon, e.g. graphite
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • 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 invention relates to a method for producing a latent heat storage device, wherein a phase change material is introduced into a molded body produced by expansion of a graphitic starting material. Also, the invention relates to a latent heat storage.
  • Latent heat storage use thermodynamic changes in state of a storage medium, wherein predominantly the phase transition is used solid / liquid and vice versa.
  • EP 1 837 617 B1 discloses a latent heat accumulator which has a shaped body which is produced by isostatic pressing of a mixture of a phase change material and an expandable graphite material.
  • a pressed graphite plate is used to produce a latent heat storage, which is impregnated with a phase change material.
  • Expanded graphite is usually first pressed into a shaped body to be then infiltrated with the phase change material. However, it is also possible to first mix expanded graphite and phase change material and then to form the corresponding mixture under pressure into a shaped article (see for example EP 1 416 027 B1).
  • the present invention has the object, a method of the type mentioned and a latent heat storage so educate that easily desired geometries of the molded body to be produced can be provided.
  • the infiltration should not be adversely affected by the shaping.
  • the graphitic starting material to be expanded is expanded in a mold that already dictates the shape of the molding.
  • a pressure achieved shaping is carried out with the result that changes in the porosity and / or extending in the expanded material channels do not occur. This results in advantages in terms of the infiltration of the phase change material in the production of a latent heat storage.
  • Another possibility is that the graphitic starting material is introduced into the mold and then the mold is heated to a temperature required for expanding the graphitic starting material.
  • the energy required for its expansion can be introduced directly into the graphitic starting material.
  • a porous form in particular consisting of or containing silicon carbide, graphite, ceramic, sintered metal is used as the mold.
  • a mold having vents and / or of a porous or perforated material such as metal such. B. copper, can be used.
  • passage openings are introduced in order to be able to discharge the gas produced during expansion.
  • the cross-section of corresponding openings is smaller than the particle size of the particles of the starting material.
  • the phase change material can then be introduced.
  • a pressureless Kapillarinfiltration is preferably provided, which has the advantage over the prior art to be taken vacuum-pressure method that there is the possibility of a residue-free retraction of the phase change material in the molding.
  • residues remain on the surface of a molded article which must be removed.
  • non-pressure infiltration capillary filtration
  • adhesion and capillary forces are utilized whereby the liquid saturant flows by itself into the porous body.
  • impregnating agent in solid form on the body to be impregnated and to heat.
  • the impregnating agent melts and runs into the body.
  • the shaped body is embedded in liquid phase change material and / or is contacted in a floating manner with the phase change material.
  • phase change material such as wax
  • a precise metering can take place.
  • graphitic starting material in the form of graphite salt one having a bulk density of between 0.1 g / ml to 0.9 g / ml, in particular 0.3 g / ml to 0.8 g / ml, wherein a bulk density in the range of 0.7 g / ml is preferable.
  • a molded body of desired geometry can be produced without difficulty, without fundamentally requiring machining after expansion, since the mold itself predetermines the desired geometry of the molded article.
  • geometrically complex moldings can be made, a possibility that does not offer the prior art.
  • Self-inventing is also - and thus independent of the production of the molded article - the pressureless infiltration (Kapillarinfiltration) of the molding, in particular the metered introduction into a recess of the molding or the floating contact with the phase change material are emphasized.
  • Kapillarinfiltration pressureless infiltration
  • the invention further relates to a latent heat storage consisting of a molded body which is infiltrated with phase change material, and in particular has been prepared by method steps, which have been previously explained.
  • a latent heat storage consisting of a molded body which is infiltrated with phase change material, and in particular has been prepared by method steps, which have been previously explained.
  • the shaping by the form in which the graphitic starting material is expanded, and the pressureless Kapillarinfiltrieren are emphasized.
  • the shaped body without phase change material has a porosity between 64% and 99.4%.
  • the molded article should have a bulk density between 0.014 g / cm 3 and 0.79 g / cm 3.
  • the volume fraction of the expanded graphitic starting material to the volume fraction of the phase change material in the molding should be between 1: 2 and 1:10.
  • Fig. 1 is a schematic representation of a mold for producing a
  • Fig. 2 is a schematic representation of another form for producing a
  • FIG. 1 shows a schematic representation of a mold 10 by means of which a shaped body of expanded graphite salt is to be produced for a latent heat store, the interior 12 of the mold 10 specifying the outer geometry of the shaped body.
  • the mold 12 is in the embodiment of a bottom part 14, a cover part 16 and between them extending peripheral wall 18, in which it is z. B. may be a hollow cylinder section. Regardless thereof, bottom part 14, cover part 16 and peripheral wall 18 may have desired inner geometries, which are designed for the shape of the molded part to be produced.
  • a graphite salt of defined amount is introduced in the interior 12 .
  • a well-ordered, highly crystalline, flaky natural graphite is used for the production of graphite salt. This is converted with a storage medium into a graphite salt. This is expanded or blown by a thermal shock treatment. The storage medium escapes. The graphite flakes increase their volume up to a factor of 400.
  • the treatment is carried out with acids, so that acid residues such as sulphates or nitrates are interposed between the graphite layers.
  • the mold 10 z. B. positioned in a furnace to introduce the required heat in the graphite salt so that it can expand, wherein the expanded graphite salt fills the entire interior space 12 of the mold 10.
  • FIG. 2 shows a further basic illustration of a mold 100, which consists of a cup-shaped bottom part 102 and a top part 104.
  • the bottom part 102 and the upper part 104 define a sectionally U-shaped interior 112, which predetermines the shape of the produced expanded graphite.
  • the molded part in the upper edge region compared to the bottom portion has a significant reduction in cross-section, a uniform compression and homogeneous pore structure of the expanded molded body is achieved due to the teaching of the invention, according to the shaping takes place during the expansion of the graphite salt to be entered into the mold 100 and not - as in the prior art - after expanding by pressure the shape is achieved.
  • the expanded molded body remains dimensionally stable, since the expanded particles adhere to one another by adhesion forces and mechanical anchoring (clawing). If, according to the prior art, a mold is to be produced which corresponds to FIG. 2, disadvantages would arise in the upper region due to the reduction in cross section compared to the bottom region and the resulting different pressure effects with regard to the pore structure and channel cross sections Infiltrate the molding with a phase change material adversely affect.
  • an electrically, gas or oil-fired oven can be used.
  • An induction furnace is also suitable.
  • Another possibility is that the graphite salt is heated by means of microwaves.
  • the amount of graphite salt to be introduced into the interior 12, 112 depends, on the one hand, on the desired porosity to be achieved and, on the other, on the temperature at which foaming, also called puffing, takes place.
  • the material of the mold 10, 100 is to be chosen such that a permeability is ensured for the leaking when blowing propellant gas. Suitable materials are for. As per se porous materials such as silicon carbide, graphite, ceramic or sintered metal. But also a perforated metal comes into question. It is essential that the passage openings are smaller than the graphite salt grain size.
  • graphite salt can be used such that z. B. has a bulk density in the range between 0.1 g / ml and 0.9 g / ml.
  • the shaped body is removed, which, as mentioned, has a defined geometry, which is predetermined by the internal geometry of the interior 12, 112.
  • the shaped body is preferably impregnated or infiltrated by pressureless capillary filtration with a phase change material (PCM). It can either be applied to the molding solid phase change material, which is then melted, z. In the temperature range up to 150 ° C to allow infiltration.
  • PCM phase change material
  • Suitable phase change materials are, in particular, those which enable a phase change in the temperature range between 60 ° C. and 300 ° C., in particular in the range between 80 ° C. and 150 ° C.
  • Preferred materials are waxes such as paraffin, sugar, alcohol, inorganic salt or salt hydrate.
  • the ratio of phase change material to expanded graphite should be in the ratio 10: 1 to 2: 1.
  • the bulk density of the expanded graphite should be between 0.014 g / cm 3 and 0.79 g / cm 3.
  • the density is temperature-dependent. So z. B. at a temperature of 600 ° C, the grains or flakes of graphite salt increase their volume by a factor of up to 100 and at a temperature of 1,000 ° C by a factor of up to 400.
  • the final porosity of the shaped body depends on the amount of graphite salt.
  • 5 g of graphite salt are filled. This is kept at a temperature of 600 ° C for 15 min and then removed from the mold after cooling. Measurements have shown that the body has a density of 0.08 g / cm J and a porosity of 96.5%.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Ceramic Products (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un régulateur thermique à changement d'état en graphite expansé par expansion d'une matière de départ graphitique et se caractérise en ce que la matière de départ graphitique est introduite dans un moule qui correspond au moins en partie à la forme négative du régulateur thermique à changement d'état, puis la matière de départ graphitique est expansée dans le moule fermé.
EP17709427.3A 2016-03-14 2017-03-07 Procédé de fabrication d'un régulateur thermique à changement d'état et régulateur thermique à changement d'état Withdrawn EP3430103A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016104661.2A DE102016104661B4 (de) 2016-03-14 2016-03-14 Verfahren zur Herstellung eines Latentwärmespeichers
PCT/EP2017/055314 WO2017157723A1 (fr) 2016-03-14 2017-03-07 Procédé de fabrication d'un régulateur thermique à changement d'état et régulateur thermique à changement d'état

Publications (1)

Publication Number Publication Date
EP3430103A1 true EP3430103A1 (fr) 2019-01-23

Family

ID=58261667

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17709427.3A Withdrawn EP3430103A1 (fr) 2016-03-14 2017-03-07 Procédé de fabrication d'un régulateur thermique à changement d'état et régulateur thermique à changement d'état

Country Status (7)

Country Link
US (1) US10781350B2 (fr)
EP (1) EP3430103A1 (fr)
JP (1) JP2019508662A (fr)
KR (1) KR20180129820A (fr)
CN (1) CN109072052B (fr)
DE (1) DE102016104661B4 (fr)
WO (1) WO2017157723A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016213727A1 (de) 2016-07-26 2018-02-01 Bayerische Motoren Werke Aktiengesellschaft Kraftfahrzeugkraftstoffpumpenabdeckung, Kraftfahrzeugkraftstoffpumpe mit einer solchen Abdeckung und Verfahren zur Herstellung der Abdeckung
CN110285609A (zh) * 2019-06-11 2019-09-27 合肥美的电冰箱有限公司 排气蒸发管组件及其制作方法以及接水盘和制冷设备
DE102020115999A1 (de) * 2020-06-17 2021-12-23 Schunk Carbon Technology Gmbh Verbundwerkstoff und Verfahren zur Herstellung
JP2022174942A (ja) * 2021-05-12 2022-11-25 株式会社前川製作所 蓄熱材用の加圧成型品、及び該加圧成型品の製造方法
AT525463A1 (de) * 2021-09-17 2023-04-15 Rep Ip Ag Transportbehälter zum Transport von temperaturempfindlichem Transportgut umfassend Behälterwände

Family Cites Families (14)

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Publication number Priority date Publication date Assignee Title
JPH01264967A (ja) * 1988-04-15 1989-10-23 Mitsui Mining Co Ltd 黒鉛成形体の製造方法
DE4016710A1 (de) * 1990-05-24 1991-11-28 Bayer Ag Verfahren zur herstellung von formteilen
US5425901A (en) 1990-07-21 1995-06-20 Bayer Aktiengesellschaft Fireproofing gels, processes for their preparation and their use, in particular for fireproof glazing
DE4130335A1 (de) * 1991-09-12 1993-03-18 Bayer Ag Blaehgraphit enthaltende formkoerper, deren herstellung und verwendung
US5382387A (en) 1991-07-15 1995-01-17 Bayer Aktiengesellschaft Mouldings containing expandable graphite, their production and their use
DE10023572A1 (de) * 2000-05-15 2001-11-22 Merck Patent Gmbh Verfahren zur Herstellung eines Speicherverbundes zur Speicherung von Wärme und Kälte
DE10250249A1 (de) 2002-10-28 2004-05-13 Sgl Carbon Ag Mischungen für Wärmespeicher
JP2007160066A (ja) * 2005-11-18 2007-06-28 Nidec Sankyo Corp アクセサリ、アクセサリ製造用焼結部品、およびアクセサリの製造方法
US20070224425A1 (en) 2006-03-24 2007-09-27 Christ Martin U Process for manufacture of a latent heat storage body
US8580171B2 (en) 2006-03-24 2013-11-12 Sgl Carbon Ag Process for manufacture of a latent heat storage device
US20120240919A1 (en) * 2007-06-22 2012-09-27 Sgl Carbon Se Latent heat storage material with phase change material impregnated in a graphite matrix, and production method
DE102010003663A1 (de) 2010-04-06 2011-10-06 Sgl Carbon Se Wärmespeicherverbundmaterial enthaltend expandierten Graphit und PCM und Verfahren zu dessen Herstellung
JP5838104B2 (ja) * 2012-02-21 2015-12-24 花王株式会社 液体含浸固形物の製造方法
US20130264023A1 (en) 2012-04-09 2013-10-10 Sgl Carbon Se Latent heat storage device with phase change material and graphite matrix

Also Published As

Publication number Publication date
US20190071594A1 (en) 2019-03-07
DE102016104661B4 (de) 2024-02-08
CN109072052A (zh) 2018-12-21
JP2019508662A (ja) 2019-03-28
DE102016104661A1 (de) 2017-09-14
WO2017157723A1 (fr) 2017-09-21
KR20180129820A (ko) 2018-12-05
US10781350B2 (en) 2020-09-22
CN109072052B (zh) 2021-02-19

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