US20230061591A1 - Dimple chiller with secondary dimples - Google Patents
Dimple chiller with secondary dimples Download PDFInfo
- Publication number
- US20230061591A1 US20230061591A1 US17/756,781 US202117756781A US2023061591A1 US 20230061591 A1 US20230061591 A1 US 20230061591A1 US 202117756781 A US202117756781 A US 202117756781A US 2023061591 A1 US2023061591 A1 US 2023061591A1
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- US
- United States
- Prior art keywords
- dimples
- main
- heat exchanger
- plate
- exchanger according
- 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.)
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- 239000012530 fluid Substances 0.000 description 4
- 239000002826 coolant Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000013101 initial test Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
- F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
- F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
- F28F3/044—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being pontual, e.g. dimples
-
- 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
- F28D9/0031—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 paired plates touching each other
- F28D9/0037—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 paired plates touching each other the conduits for the other heat-exchange medium also being formed by paired plates touching each other
-
- 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
- F28D9/0031—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 paired plates touching each other
- F28D9/0043—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 paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another
- F28D9/005—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 paired plates touching each other the plates having openings therein for circulation of at least one heat-exchange medium from one conduit to another the plates having openings therein for both heat-exchange media
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/08—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning
- F28F3/086—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning having one or more openings therein forming tubular heat-exchange passages
Definitions
- Dimple plates in heat exchanger (HEX) applications often suffer from low specific heat exchange rates due to low velocities of the heat-exchanging fluids.
- the invention can be regarded as being a plate of a heat exchanger or a heat exchanger having at least one plate which is preferably rectangular and comprises main dimples, between which secondary dimples are formed that are flatter and/or smaller with respect to their dimensions as seen in a plan view.
- the plate thus has main dimples, depressions, bumps and/or protrusions or bulges which are preferably arranged in rows preferably extending obliquely to the edges of the preferably rectangular plate.
- secondary dimples are formed between the main dimples, which can alternatively be designated as the main dimples as above.
- the rows are thereby seen in those directions in which the dimples are lined up one behind the other with minimal spacing. These rows can extend at any angle to the edges, as well as perpendicular to the one edges and therefore parallel to the other edges.
- the present invention leads to increased heat exchange rates in a dimple heat exchanger, in particular a cooler plate, while the active surface for heat exchange is not reduced.
- the surface of heat exchange is increased without changing the use of material.
- the velocities of the fluids around the secondary dimples are increased, which results in an increased heat exchange.
- the invention further leads to a change in flow directions not only in the horizontal plane, but also perpendicular thereto, thus leading to a mixing of temperature layers in the channels between the dimple heat exchanger plates.
- the depth of the secondary dimples is set to a maximum of 0.5 times the channel height and/or 0.5 times the depth of the main dimples.
- the depth of the main dimples can be set to a maximum corresponding to the channel height.
- the distance between the main and secondary dimples in an x direction can be varied between 1.9 and 2.5 mm and in they direction (a second diagonal direction) between 1.9 and 2.5 mm.
- one secondary dimple can be formed between two main dimples.
- at least one, preferably precisely one, secondary dimple is formed in each case on the entire plate between two main dimples, or several, preferably four, and preferably spaced apart by 90 degrees, secondary dimples are formed in the vicinity of each main dimple.
- At least some, preferably all, of the secondary dimples can be arranged on the lines or rows that are described by the main dimples.
- the main dimples are preferably arranged in rows which preferably extend obliquely to the edges of the preferably rectangular plate.
- the rows are designated above as diagonals; however, they do not have to correspond to the diagonals of the rectangular plate, but can extend at an angle thereto.
- the rows can be formed in two directions extending at an angle to each other, wherein the angle can be equal or not equal to 90 degrees. For all of the above-mentioned embodiments, favorable properties could be determined in initial tests and simulations.
- the sheet thickness of the plate can thereby be less in the area of the main and/or secondary dimples than between the dimples.
- the main and/or secondary dimples can be circular, elliptical, or oval in plan view.
- the main axes of elliptical or oval main dimples can extend parallel to a plate edge, in particular parallel to the longer edge of a rectangular plate.
- the main axes of elliptical or oval secondary dimples can extend at an angle to the plate edges of a rectangular plate.
- the main axes of several elliptical or oval secondary dimples can extend parallel to each other and at an angle to the main axes of several other secondary dimples.
- FIG. 1 shows a plan view of a plate of a conventional heat exchanger with dimples.
- FIG. 2 shows a plate similar to that of FIG. 1 , which additionally comprises the secondary dimples according to the invention.
- FIG. 3 is a graph showing the increase in performance of a heat exchanger with the plates of FIG. 2 compared to the heat exchanger with the plates of FIG. 1 .
- FIGS. 4 and 5 show plates similar to those of FIGS. 1 , 2 , 4 and 5 including their dimensions.
- FIG. 6 shows the plate of FIG. 8 including one detail and preferred sizes of the dimples.
- FIG. 7 shows further experimental results indicating an increase in performance of the new type of plate by between 6.2 and 10.2%, without changing neither the size of the plate nor the amount of material used, although the secondary dimples are formed.
- a plate 100 of a heat exchanger comprises numerous dimples which in this case, in plan view, are oval dimples 102 that are arranged on lines extending obliquely to the plate edges, which do not quite correspond to the diagonals of the rectangle forming the plate shape.
- two groups of rows can be seen, one extending from bottom left to top right and the other from bottom right to top left, and which in the case shown intersect at an angle smaller than 90 degrees.
- the arrangement of the main dimples 12 substantially corresponds to that of the (only present) dimples 102 as shown in FIG. 1 .
- one secondary dimple 14 is formed in each case between every two main dimples 12 , which in this case in plan view is both smaller and, not visible in plan view, flatter.
- precisely one secondary dimple 14 is formed in each case between two main dimples 12 , and therefore four secondary dimples are formed in the vicinity of every main dimple.
- the secondary dimples are located on those lines or rows that are described by the main dimples.
- the main dimples 12 are oval when viewed from the top, with their longer axis extending parallel to the longer edge of the rectangular plate 10 , and the secondary dimples are circular when viewed from the top.
- FIG. 3 which shows a performance comparison of the plates from FIGS. 1 and 2 in a two-sided heated wall, there appears an increase in performance from 2.0 to nearly 5% depending on the coolant flow.
- FIG. 4 shows a further plate 100 comprising only a single type of dimple 102 .
- a plate 10 according to the invention according to FIG. 5 is provided with both main dimples 12 and secondary dimples 14 .
- the main dimples 12 and the secondary dimples 14 are also arranged in intersecting rows in this embodiment, which also in this case do not correspond to the diagonals of the rectangular plate. However, they are arranged at an angle of 90 degrees to each other in this embodiment.
- both the main dimples 12 and the secondary dimples 14 are circular in plan view.
- the plates of FIGS. 4 and 5 can typically be between 60 mm and 100 mm wide and between 80 mm and 140 mm long. According to an exemplary embodiment, they are each 64 mm wide and 102 mm long.
- the shape and alignment of the main dimples 12 and the secondary dimples 14 can be seen more clearly in the detailed view of FIG. 6 .
- four secondary dimples 14 are arranged here around one main dimple 12 at a constant spacing of 90 degrees.
- the main dimples of the plate of FIG. 6 can have a diameter of 4.1 mm and a depth of 1.2 mm. 67 dimples of this type can be present on the plate shown in FIG. 6 .
- the secondary dimples can have a diameter of 1.9 mm and a depth of 0.6 mm, and 140 dimples of this type can be formed on the plate shown in FIG. 9 .
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- 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
- This patent application is a United States nation phase patent application based on PCT/KR2021/001305 filed on Feb. 1, 2021, which claims the benefit of German Patent Application No.
DE 10 2020 201 344.6 filed on Feb. 4, 2020 and German Patent Application No. DE 10 2020 212 900.2 filed on Oct. 13, 2020, the entire disclosures of which are hereby incorporated herein by reference. - Dimple plates in heat exchanger (HEX) applications often suffer from low specific heat exchange rates due to low velocities of the heat-exchanging fluids.
- One known solution is the increase of dimple size to increase local velocities and change the flow directions in the fluid.
- However, an increase of dimple size directly leads to a reduced surface for the heat exchange and to an increase of pressure drop in the channel. Therefore, a solution must be found to increase heat exchange rates with a minimal increase in pressure drop in the fluid at an accelerated rate and taking away from the surface of heat exchange.
- The above problem is solved by the subject matter as shown and described herein.
- The invention can be regarded as being a plate of a heat exchanger or a heat exchanger having at least one plate which is preferably rectangular and comprises main dimples, between which secondary dimples are formed that are flatter and/or smaller with respect to their dimensions as seen in a plan view.
- The plate thus has main dimples, depressions, bumps and/or protrusions or bulges which are preferably arranged in rows preferably extending obliquely to the edges of the preferably rectangular plate. According to the invention, secondary dimples are formed between the main dimples, which can alternatively be designated as the main dimples as above. The rows are thereby seen in those directions in which the dimples are lined up one behind the other with minimal spacing. These rows can extend at any angle to the edges, as well as perpendicular to the one edges and therefore parallel to the other edges.
- As a result of the secondary dimples, the present invention leads to increased heat exchange rates in a dimple heat exchanger, in particular a cooler plate, while the active surface for heat exchange is not reduced. In fact, the surface of heat exchange is increased without changing the use of material. In addition, the velocities of the fluids around the secondary dimples are increased, which results in an increased heat exchange. The invention further leads to a change in flow directions not only in the horizontal plane, but also perpendicular thereto, thus leading to a mixing of temperature layers in the channels between the dimple heat exchanger plates.
- Preferred further developments are described herein.
- The depth of the secondary dimples is set to a maximum of 0.5 times the channel height and/or 0.5 times the depth of the main dimples. The depth of the main dimples can be set to a maximum corresponding to the channel height.
- The distance between the main and secondary dimples in an x direction (a first diagonal direction) can be varied between 1.9 and 2.5 mm and in they direction (a second diagonal direction) between 1.9 and 2.5 mm.
- In each case one secondary dimple can be formed between two main dimples. Preferably at least one, preferably precisely one, secondary dimple is formed in each case on the entire plate between two main dimples, or several, preferably four, and preferably spaced apart by 90 degrees, secondary dimples are formed in the vicinity of each main dimple.
- At least some, preferably all, of the secondary dimples can be arranged on the lines or rows that are described by the main dimples.
- The main dimples are preferably arranged in rows which preferably extend obliquely to the edges of the preferably rectangular plate. The rows are designated above as diagonals; however, they do not have to correspond to the diagonals of the rectangular plate, but can extend at an angle thereto. The rows can be formed in two directions extending at an angle to each other, wherein the angle can be equal or not equal to 90 degrees. For all of the above-mentioned embodiments, favorable properties could be determined in initial tests and simulations.
- The sheet thickness of the plate can thereby be less in the area of the main and/or secondary dimples than between the dimples.
- The main and/or secondary dimples can be circular, elliptical, or oval in plan view. The main axes of elliptical or oval main dimples can extend parallel to a plate edge, in particular parallel to the longer edge of a rectangular plate. The main axes of elliptical or oval secondary dimples can extend at an angle to the plate edges of a rectangular plate. The main axes of several elliptical or oval secondary dimples can extend parallel to each other and at an angle to the main axes of several other secondary dimples.
- Further details of the invention can be seen from the drawings.
-
FIG. 1 shows a plan view of a plate of a conventional heat exchanger with dimples. -
FIG. 2 shows a plate similar to that ofFIG. 1 , which additionally comprises the secondary dimples according to the invention. -
FIG. 3 is a graph showing the increase in performance of a heat exchanger with the plates ofFIG. 2 compared to the heat exchanger with the plates ofFIG. 1 . -
FIGS. 4 and 5 show plates similar to those ofFIGS. 1, 2, 4 and 5 including their dimensions. -
FIG. 6 shows the plate ofFIG. 8 including one detail and preferred sizes of the dimples. -
FIG. 7 shows further experimental results indicating an increase in performance of the new type of plate by between 6.2 and 10.2%, without changing neither the size of the plate nor the amount of material used, although the secondary dimples are formed. - As can be seen in
FIG. 1 , aplate 100 of a heat exchanger comprises numerous dimples which in this case, in plan view, areoval dimples 102 that are arranged on lines extending obliquely to the plate edges, which do not quite correspond to the diagonals of the rectangle forming the plate shape. In particular, two groups of rows can be seen, one extending from bottom left to top right and the other from bottom right to top left, and which in the case shown intersect at an angle smaller than 90 degrees. - In the
plate 10 of a heat exchanger according to the invention according toFIG. 2 , the arrangement of themain dimples 12 substantially corresponds to that of the (only present)dimples 102 as shown inFIG. 1 . - According to the invention, one
secondary dimple 14 is formed in each case between every twomain dimples 12, which in this case in plan view is both smaller and, not visible in plan view, flatter. In particular, precisely onesecondary dimple 14 is formed in each case between twomain dimples 12, and therefore four secondary dimples are formed in the vicinity of every main dimple. As is also preferred, the secondary dimples are located on those lines or rows that are described by the main dimples. In the case shown, themain dimples 12 are oval when viewed from the top, with their longer axis extending parallel to the longer edge of therectangular plate 10, and the secondary dimples are circular when viewed from the top. - As is revealed in
FIG. 3 , which shows a performance comparison of the plates fromFIGS. 1 and 2 in a two-sided heated wall, there appears an increase in performance from 2.0 to nearly 5% depending on the coolant flow. -
FIG. 4 shows afurther plate 100 comprising only a single type of dimple 102. - In contrast, a
plate 10 according to the invention according toFIG. 5 is provided with bothmain dimples 12 andsecondary dimples 14. Unlike the plates ofFIGS. 1, 2, and 4 , themain dimples 12 and thesecondary dimples 14 are also arranged in intersecting rows in this embodiment, which also in this case do not correspond to the diagonals of the rectangular plate. However, they are arranged at an angle of 90 degrees to each other in this embodiment. Moreover, in this case, both themain dimples 12 and thesecondary dimples 14 are circular in plan view. The plates ofFIGS. 4 and 5 can typically be between 60 mm and 100 mm wide and between 80 mm and 140 mm long. According to an exemplary embodiment, they are each 64 mm wide and 102 mm long. - The shape and alignment of the
main dimples 12 and thesecondary dimples 14 can be seen more clearly in the detailed view ofFIG. 6 . In particular, foursecondary dimples 14 are arranged here around onemain dimple 12 at a constant spacing of 90 degrees. The main dimples of the plate ofFIG. 6 can have a diameter of 4.1 mm and a depth of 1.2 mm. 67 dimples of this type can be present on the plate shown inFIG. 6 . The secondary dimples can have a diameter of 1.9 mm and a depth of 0.6 mm, and 140 dimples of this type can be formed on the plate shown inFIG. 9 . - As is apparent from
FIG. 7 , there is an increase in performance, depending on the coolant flow, between 6.2 and 10.2%.
Claims (11)
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020201344.6 | 2020-02-04 | ||
DE102020201344 | 2020-02-04 | ||
DE102020212900.2A DE102020212900A1 (en) | 2020-02-04 | 2020-10-13 | Dimple cooler with additional dimples |
DE102020212900.2 | 2020-10-13 | ||
PCT/KR2021/001305 WO2021157980A1 (en) | 2020-02-04 | 2021-02-01 | Dimple chiller with secondary dimples |
Publications (1)
Publication Number | Publication Date |
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US20230061591A1 true US20230061591A1 (en) | 2023-03-02 |
Family
ID=76853530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/756,781 Pending US20230061591A1 (en) | 2020-02-04 | 2021-02-01 | Dimple chiller with secondary dimples |
Country Status (6)
Country | Link |
---|---|
US (1) | US20230061591A1 (en) |
JP (1) | JP2023512552A (en) |
KR (1) | KR20220082916A (en) |
CN (1) | CN114599929A (en) |
DE (1) | DE102020212900A1 (en) |
WO (1) | WO2021157980A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050047932A1 (en) * | 2003-08-14 | 2005-03-03 | Tomoyoshi Nakae | Heat exchanging wall, gas turbine using the same, and flying body with gas turbine engine |
US20140046248A1 (en) * | 2011-06-09 | 2014-02-13 | Sis-Ter S.P.A. | Heat exchange device |
US9033030B2 (en) * | 2009-08-26 | 2015-05-19 | Munters Corporation | Apparatus and method for equalizing hot fluid exit plane plate temperatures in heat exchangers |
US10352566B2 (en) * | 2013-06-14 | 2019-07-16 | United Technologies Corporation | Gas turbine engine combustor liner panel |
US10830448B2 (en) * | 2016-10-26 | 2020-11-10 | Raytheon Technologies Corporation | Combustor liner panel with a multiple of heat transfer augmentors for a gas turbine engine combustor |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0654198B2 (en) * | 1985-10-14 | 1994-07-20 | 日本電装株式会社 | Stacked heat exchanger |
KR20000010016U (en) * | 1998-11-14 | 2000-06-15 | 신영주 | Heat exchanger tube |
FR2788123B1 (en) * | 1998-12-30 | 2001-05-18 | Valeo Climatisation | EVAPORATOR, HEATING AND/OR AIR CONDITIONING DEVICE AND VEHICLE COMPRISING SUCH EVAPORATOR |
KR100350946B1 (en) * | 1999-12-21 | 2002-08-28 | 한라공조주식회사 | Laminate type heat exchanger for vehicle |
KR100819010B1 (en) * | 2001-08-29 | 2008-04-02 | 한라공조주식회사 | Heat exchanger |
US20080078538A1 (en) * | 2006-09-28 | 2008-04-03 | Ali Jalilevand | Heat exchanger plate having integrated turbulation feature |
JP2011007412A (en) * | 2009-06-25 | 2011-01-13 | Mahle Filter Systems Japan Corp | Oil cooler |
RU2502932C2 (en) * | 2010-11-19 | 2013-12-27 | Данфосс А/С | Heat exchanger |
JP2014016144A (en) * | 2012-07-05 | 2014-01-30 | Airec Ab | Plate for heat exchanger, heat exchanger, and air cooler comprising heat exchanger |
CN104654889A (en) * | 2013-11-25 | 2015-05-27 | 李鹏 | Heat transfer plate of plate heat exchanger |
-
2020
- 2020-10-13 DE DE102020212900.2A patent/DE102020212900A1/en active Pending
-
2021
- 2021-02-01 US US17/756,781 patent/US20230061591A1/en active Pending
- 2021-02-01 JP JP2022547797A patent/JP2023512552A/en active Pending
- 2021-02-01 CN CN202180006122.XA patent/CN114599929A/en active Pending
- 2021-02-01 KR KR1020227017211A patent/KR20220082916A/en not_active Application Discontinuation
- 2021-02-01 WO PCT/KR2021/001305 patent/WO2021157980A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050047932A1 (en) * | 2003-08-14 | 2005-03-03 | Tomoyoshi Nakae | Heat exchanging wall, gas turbine using the same, and flying body with gas turbine engine |
US9033030B2 (en) * | 2009-08-26 | 2015-05-19 | Munters Corporation | Apparatus and method for equalizing hot fluid exit plane plate temperatures in heat exchangers |
US20140046248A1 (en) * | 2011-06-09 | 2014-02-13 | Sis-Ter S.P.A. | Heat exchange device |
US10352566B2 (en) * | 2013-06-14 | 2019-07-16 | United Technologies Corporation | Gas turbine engine combustor liner panel |
US10830448B2 (en) * | 2016-10-26 | 2020-11-10 | Raytheon Technologies Corporation | Combustor liner panel with a multiple of heat transfer augmentors for a gas turbine engine combustor |
Also Published As
Publication number | Publication date |
---|---|
JP2023512552A (en) | 2023-03-27 |
DE102020212900A1 (en) | 2021-08-05 |
CN114599929A (en) | 2022-06-07 |
WO2021157980A1 (en) | 2021-08-12 |
KR20220082916A (en) | 2022-06-17 |
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