EP3405732A1 - Neuartiger waermeuebertrager - Google Patents
Neuartiger waermeuebertragerInfo
- Publication number
- EP3405732A1 EP3405732A1 EP17700833.1A EP17700833A EP3405732A1 EP 3405732 A1 EP3405732 A1 EP 3405732A1 EP 17700833 A EP17700833 A EP 17700833A EP 3405732 A1 EP3405732 A1 EP 3405732A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat exchanger
- spacers
- graphite
- medium
- heat exchange
- 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- Withdrawn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
- 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
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
-
- 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
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/0062—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by spaced plates with inserted elements
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- 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
Definitions
- the invention relates to a novel heat exchanger and its use.
- Heat exchangers are used in particular in the field of heating technology, preferably as a gas / liquid heat exchanger. It is known to heat transfer elements of heat exchangers in a variety of materials, such. Metals or plastics. For example, be corrosive media
- Heat exchanger elements made of phenol resin impregnated graphite used According to the prior art (Chemical Industry, Issue 5, 1993, pp 24-27) is a massive synthetic graphite block is used, is machined mechanically in such a way that channels for a primary and a secondary side arise in which flue gas or Water can be guided. The hot flue gas releases the energy to the water and warms it up.
- the graphite block acts as a corrosion-resistant heat exchanger in e.g. Heating systems to allow energy-efficient cooling of the flue gas below the dew point.
- the porous graphite block To exclude leaks between the two sides, the porous graphite block must be impregnated with a phenolic resin and thus made gas- and liquid-tight.
- a heat exchanger comprising a stack of parallel, plate-shaped heat exchange elements (A), for heat transfer from a first medium to a second medium and at least two spacers (B), characterized in that the heat exchange elements (A) and the at least two spacers (B) consist of graphite foils and / or impregnated graphite foils and the flows of the first medium and the second medium are arranged as a cross-flow.
- a stack of parallel, plate-shaped heat exchange elements (A) is understood to mean a number of at least two parallel, plate-shaped heat exchange elements (A), wherein the at least two parallel, plate-shaped heat exchange elements (A) can lie in direct contact one above the other.
- the heat exchanger there is no graphite core of a synthetic graphite block, but a core of individual, stacked graphite foils.
- the targeted utilization of the high thermal conductivity of the graphite foil in the plane, for example, the heat of a gas stream can be highly effective derived from water as a heat transfer fluid, which can be highly compact designs realized.
- the graphite foil according to the present invention can be made of either expanded graphite or synthetic graphite.
- graphite foil expanded graphite is rolled into graphite foils.
- Graphite sheets are impermeable to gases, vapors, and liquids and are oxidized in oxidizing gases, such as e.g. Air resistant up to about 500 ° C.
- graphite such as natural graphite is usually mixed with an intercalant such as nitric acid or sulfuric acid and heat-treated at an elevated temperature of, for example, 600 ° -1200 ° C. (DE 10003927A1).
- an intercalant such as nitric acid or sulfuric acid
- Expanded graphite represents a graphite that is expanded by a factor of 80 or more, for example, compared to natural graphite in the plane perpendicular to the hexagonal carbon layers. Due to the expansion, expanded graphite is characterized by excellent formability and good intermeshability. Expanded graphite may be used in sheet form, preferably using a graphite foil having a density of 1.3 to 2.0 g / cm 3 . A graphite foil in this density range has thermal conductivities of 300 W / (mK) to 500 W / (mK). The thermal conductivity is determined by the Angstrom method ("Angström's Method of
- graphite foil can also be produced via a synthetic process route. If, for example, polyimide film is carbonized and subsequently graphitized at up to 3000 ° C., a synthetic graphite film with heat conductivities in the film plane of up to 1500 W / (mK) is obtained.
- the graphite foils are impregnated with resin, preferably acrylate resin or furan resin.
- resin preferably acrylate resin or furan resin.
- the impregnation allows additional sealing to avoid unwanted contact and thus a reaction of the first medium with the second medium, higher strength of the graphite foils and prevents unwanted media uptake in the graphite foil.
- the heat exchanger can consist of expanded graphite foils or synthetic graphite foils or a combination thereof.
- the stack of heat exchange elements (A) may alternately comprise expanded graphite foil and synthetic graphite foil.
- the streams of the media are guided in such a way that their directions intersect, preferably perpendicular to one another.
- the flow (S1) of the first medium extends along the parallel, plate-shaped heat exchange elements (A) between spacers (B) (see Figure 4).
- the flow (S2) of the second medium runs along bores (D) which extend through both the heat exchange elements (A) and spacers (B) (see FIG. 4).
- these holes (D) are perpendicular to the plane of the parallel, plate-shaped heat exchange elements (A).
- a preferred embodiment is a meander-shaped deflection of the flow (S2) of the second medium at the bores (D).
- the heat transfer takes place from the first medium along the parallel stack of graphite foil as heat exchange elements (A) to the second medium, wherein the heat is dissipated outwardly in the plane of the heat exchange elements (A) to the second medium flowing through the bores (D) ,
- At least two spacers (B) are placed between the individual parallel, plate-shaped heat exchange elements (A), which form a space between the heat exchange elements (A) and thus an intermediate space (E) for the flow of the first medium.
- These spacers (B) bound laterally the spaces (E) for the flow (S1) of the first medium. This allows a uniform flow rate of the first medium without pressure loss.
- at least two stacks of spacers (B) are present between the individual parallel, plate-shaped heat exchange elements (A).
- a stack of spacers (B) means an arrangement of at least two spacers (B) directly above one another.
- the distance between the heat exchange elements (A) according to the invention is preferably 0.3 mm to 5.0 mm. Particularly preferably, the distance is 0.5 mm to 1, 5 mm. A distance smaller than 0.3 mm does not make sense, because then the graphite foil is too difficult to handle and the pressure loss in the flow (S1) is undesirably high. A distance greater than 5.0 mm is not useful, since a milled heat exchanger made of a graphite block at this size is easier to produce than a heat exchanger according to the invention.
- at least one bore (D) is mounted, which passes through both the heat exchange elements (A) and the at least two spacers (B) and thus forms one or more channels for the flow (S2) of the second medium.
- the heat exchange elements (A) and the spacers (B) are in direct contact with the second medium. This allows the heat transfer from the first medium to the second medium.
- the at least two spacers (B) are arranged on outer edges of the heat exchange elements.
- the spacers (B) terminate laterally edge to edge with the plate-shaped heat exchange elements (A).
- the at least two spacers (B) are mounted on two opposite sides between the heat exchange elements (A).
- the spacers (B) also serve as a seal between the individual heat exchange elements (A), so that no additional seal is required.
- internal spacers (C) are mounted.
- internal is meant the area between the at least two spacers (B).
- the internal spacers (C) can be arranged between the individual heat exchange elements (A).
- the inner spacers (C) are arranged centrally in this area. This prevents sagging of the heat exchange elements (A) and allows a uniform flow (S1).
- the inner spacers (C) consist of graphite foils and / or impregnated graphite foils.
- Heat exchange elements (A) depend on the use.
- the heat exchanger in the field of heating technology as
- the geometry of the heat exchanger such as length, width, spaces (E) between the heat exchange elements (A), and number and position of the holes (D) are freely adjustable.
- the heat exchanger according to the invention has a high flexibility in construction.
- the heat exchanger according to the invention can be constructed variable and highly compact. It can be used for a diverse range of applications. Because of the high efficiency of the heat exchanger according to the invention is particularly advantageous if the available space does not allow the installation or installation of a large volume heat exchanger.
- the heat exchange elements (A), the spacers (B) and / or the spacers (C) are produced by punching.
- the heat exchange elements (A), the spacers (B) and / or the spacers (C) can be produced, for example, simply by mechanical punching or by water jet or laser cutting.
- the heat exchange elements (A), the spacers (B) and / or the spacers (C) of expanded graphite are pressed close to the final contour.
- Figure 1 shows a single plate-shaped heat exchange element (A) with holes (D).
- Figure 2 shows a spacer (B) with holes (D).
- Figure 3 is an exploded view showing the arrangement of heat exchange elements (A) and spacers (B).
- FIG. 4 shows a heat exchanger according to the invention with parallel, plate-shaped heat exchange elements (A) and spacers (B).
- FIG. 5 shows a heat exchanger according to the invention with internal spacers (C).
- FIG. 4 shows a heat exchanger according to the invention with parallel, plate-shaped heat exchange elements (A) and spacers (B).
- the flow (S1) of the first medium runs along the parallel, plate-shaped heat exchange elements (A) between the spacers (B), the flow (S2) of the second medium perpendicular to the flow (S1) of the first medium through the bores (D) runs.
- Figure 5 shows a cross section of a heat exchanger according to the invention with parallel, plate-shaped heat exchange elements (A), spacers (B) on the outer edge and inner spacers (C). The inner spacers (C) are arranged centrally.
- Figure 5 shows how the holes (D) pass through the heat exchange elements (A) and spacers (B) and thereby form the channels for the flow (S2) of the second medium.
- the spacers (B) and (C) form intermediate spaces (E) for the flow (S1) of the first medium.
- the parallel plate-shaped heat exchange elements (A) serve to transfer heat from a first medium, not shown, e.g. hot combustion gas, to a second medium, not shown, e.g. Water, which serves as heat carrier for heating systems. Further (not shown) are a bottom and a cover plate and supply and discharge pipe for the first medium and the second medium present.
- the combustion gas flows through the spaces (E) bounded by the heat exchanging elements (A) and the spacers (B) and releases the heat through the heat exchanging elements (A) to the water passing through the bores (D) Water is in direct contact with the heat exchange elements (A).
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202016000316.0U DE202016000316U1 (de) | 2016-01-20 | 2016-01-20 | Wärmeübertrager |
PCT/EP2017/051077 WO2017125490A1 (de) | 2016-01-20 | 2017-01-19 | Neuartiger waermeuebertrager |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3405732A1 true EP3405732A1 (de) | 2018-11-28 |
Family
ID=55486269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17700833.1A Withdrawn EP3405732A1 (de) | 2016-01-20 | 2017-01-19 | Neuartiger waermeuebertrager |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3405732A1 (de) |
DE (1) | DE202016000316U1 (de) |
WO (1) | WO2017125490A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3208566B1 (de) * | 2016-02-22 | 2019-05-29 | Vaillant GmbH | Primärwärmetauscher |
CN108050878B (zh) * | 2017-11-27 | 2019-10-18 | 浙江兴益风机电器有限公司 | 一种以石墨烯为基质的热交换器芯片的成份组方及制造工艺 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3231015A (en) * | 1963-05-01 | 1966-01-25 | Babcock & Wilcox Co | Graphite-plate heat exchange apparatus |
US3363681A (en) * | 1967-01-24 | 1968-01-16 | Union Carbide Corp | Heat exchanger |
DE2406522A1 (de) * | 1974-02-12 | 1975-08-14 | Sigri Elektrographit Gmbh | Plattenwaermeaustauscher |
JPS57155087A (en) * | 1981-03-20 | 1982-09-25 | Hitachi Ltd | Manufacture of aluminum heat exchanger |
US5628363A (en) * | 1995-04-13 | 1997-05-13 | Alliedsignal Inc. | Composite continuous sheet fin heat exchanger |
WO2000031485A1 (en) * | 1998-11-25 | 2000-06-02 | Alliedsignal Inc. | Counter-flow heat exchanger with integral manifolds and passage |
-
2016
- 2016-01-20 DE DE202016000316.0U patent/DE202016000316U1/de not_active Expired - Lifetime
-
2017
- 2017-01-19 EP EP17700833.1A patent/EP3405732A1/de not_active Withdrawn
- 2017-01-19 WO PCT/EP2017/051077 patent/WO2017125490A1/de active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2017125490A1 (de) | 2017-07-27 |
DE202016000316U1 (de) | 2016-02-19 |
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