US20220228809A1 - Heat exchanger, method for producing a heat exchanger and power plant comprising such a heat exchanger - Google Patents
Heat exchanger, method for producing a heat exchanger and power plant comprising such a heat exchanger Download PDFInfo
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- US20220228809A1 US20220228809A1 US17/616,653 US202017616653A US2022228809A1 US 20220228809 A1 US20220228809 A1 US 20220228809A1 US 202017616653 A US202017616653 A US 202017616653A US 2022228809 A1 US2022228809 A1 US 2022228809A1
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- Prior art keywords
- fins
- heat exchanger
- stack
- pipe conduits
- passage holes
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- Abandoned
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- 238000004519 manufacturing process Methods 0.000 title abstract description 9
- 239000000112 cooling gas Substances 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 239000002826 coolant Substances 0.000 claims description 34
- 239000000498 cooling water Substances 0.000 claims description 25
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 239000007769 metal material Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 14
- 238000010276 construction Methods 0.000 description 9
- 230000008901 benefit Effects 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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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
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
- F28D7/082—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
- F28D7/085—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration in the form of parallel conduits coupled by bent portions
- F28D7/087—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration in the form of parallel conduits coupled by bent portions assembled in arrays, each array being arranged in the same plane
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/006—Auxiliaries or details not otherwise provided for
-
- 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
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
- F28D7/0083—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids with units having particular arrangement relative to a supplementary heat exchange medium, e.g. with interleaved units or with adjacent units arranged in common flow of supplementary heat exchange medium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
- F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
- F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
- F28F1/325—Fins with openings
-
- 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
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/085—Heat exchange elements made from metals or metal alloys from copper or copper alloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
-
- 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
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0028—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for cooling heat generating elements, e.g. for cooling electronic components or electric devices
- F28D2021/0031—Radiators for recooling a coolant of cooling systems
-
- 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
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/004—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for engine or machine cooling systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
- F28F2009/004—Common frame elements for multiple cores
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2210/00—Heat exchange conduits
- F28F2210/08—Assemblies of conduits having different features
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2215/00—Fins
- F28F2215/04—Assemblies of fins having different features, e.g. with different fin densities
Definitions
- the present invention relates to a heat exchanger through which a medium to be cooled flows in a flow direction during operation thereof.
- the present invention further relates to a process for producing such a heat exchanger.
- the invention additionally relates to a power plant having a generator cooled by means of a generator cooling gas and a heat exchanger that cools the generator cooling gas.
- Power plants for example gas turbine power plants, steam turbine power plants, combined gas and steam turbine power plants, solar power plants or the like, comprise a multitude of components that require cooling, in order firstly to remove the waste heat that arises and secondly to increase the output of the power plant.
- the generator used for power generation which is generally cooled with generator cooling gas recooled by means of a heat exchanger.
- the heat exchanger is usually connected to a closed cooling water system of the power plant, via which further heat exchangers are also supplied with cooling water for example those for lubricant oil and/or sealing oil cooling, for cooling of pumps or the like.
- the cooling water of the cooling water circuit can be re-cooled in various ways, for example by means of fresh water flow cooling, circulation cooling using a cooling tower or air-cooled coolers, etc.
- a possible achievable electrical power in the generator depends on the cold gas temperature of the generator cooling gas defined for cooling of the generator windings, i.e. the generator cooling gas temperature on entry into the generator.
- the lower the cold gas temperature the more mechanical energy can be converted to electrical energy in the generator.
- the generator cooling gas is recooled as described above within a heat exchanger, through which cooling water from the cooling system of the power plant flows.
- the cold gas temperature of the generator cooling gas is coupled to the cooling water temperature of the cooling water flowing through the heat exchanger.
- the cooling water temperature in turn is dependent on the recooling of the cooling water and consequently cannot be lowered at will. There are thus limits to the electrical power achievable in the generator.
- a heat exchanger comprising a first stack of fins having a multitude of first fins stacked in a stacking direction that extends transverse to the flow direction, wherein the first fins are each provided with a multitude of first passage holes that are flush with one another in stacking direction, at least one further stack of fins arranged adjacent to the first stack of fins in flow direction, and having a multitude of second fins stacked in the stacking direction, wherein the second fins are each provided with a multitude of second passage holes that are flush with one another in stacking direction, first pipe conduits that extend through the first passage holes of the first fins of the first stack of fins and are press-fitted with the first fins, second pipe conduits that extend through the second passage holes of the second fins of the at least one further stack of fins and are press-fitted with the second fins, wherein the first pipe conduits and the second pipe conduits are not connected to one another for flow purposes and are provided for passage of a first cooling medium and a second
- the first cooling medium may be cooling water, for example.
- the second cooling medium used may, for example, be a coolant which is recooled in a cooling unit. If the medium to be cooled is generator cooling gas, the cold gas temperature thereof on entry into the generator is not limited by the degree of recooling of the cooling water of the cooling water system of the power plant. Instead, the cold gas temperature of the generator cooling gas can be lowered further via heat exchange with the coolant that flows through the heat exchanger, such that it can be adapted flexibly to the cooling demand of the generator if, for example, power-increasing measures are undertaken on the turbine.
- a further advantage of the heat exchanger of the invention is that the mechanical coupling of the stacks of fins through which the different cooling media flow via the at least one cover imparts very good mechanical stiffness to both stacks of fins with a simultaneously very inexpensive construction of low volume, even if one of the stacks of fins in itself should have only very low intrinsic stiffness, for example, on account of low construction depth.
- This is important especially when an existing heat exchanger in which the generator cooling gas has to date been recooled by means of cooling water only is to be replaced by a heat exchanger of the invention in order to lower the cold gas temperature of the generator cooling gas by additional cooling by means of a coolant.
- the construction space available is defined by the dimensions of the old heat exchanger and is very limited.
- barely any space is available for a stack of fins through which a second cooling medium flows, and therefore this second stack of fins can frequently be executed only with a very low construction depth, which leads to low intrinsic stiffness.
- the first fins have a greater area than the second fins.
- the dimensions of the fins of the respective stacks of fins are matched to the respective cooling medium.
- the design of the surface of the first fins is advantageously different than the design of the surface of the second fins. In this way too, it is possible to achieve adaptation of the stacks of fins to the respective cooling medium.
- the first fins and the second fins have been produced from a sheet material, for example from aluminum, in order to achieve good thermal conductivity.
- a distance between the first fins in stacking direction is different than the distance between the second fins in stacking direction, advantageously greater.
- the first fins and the second fins may have been produced from a sheet material having a coating on one or both sides.
- the first pipe conduits are each connected to one another via U-shaped connecting conduits, and the first cooling medium flows through them successively, and/or the second pipe conduits are each connected to one another by U-shaped connecting conduits, and the second cooling medium flows through them successively.
- the flow cross section of the first pipe conduits is advantageously different than the flow cross section of the second pipe conduits, advantageously greater.
- the first pipe conduits and the second pipe conduits have been produced from a metallic material, advantageously from copper, which achieves good thermal conductivity.
- the inner faces of the first pipe conduits and/or the inner faces of the second pipe conduits are structured in order to increase their size, which is conducive to better heat transfer.
- An arrangement pattern of the first passage holes advantageously differs from the arrangement pattern of the second passage holes.
- the at least one cover has advantageously been produced from a metallic material, advantageously from a metal sheet. This leads to a simple and inexpensive construction of the at least one cover.
- the at least one cover encompasses the first stack of fins and the at least one further stack of fins on opposite sides, which further increases the mechanical stiffness of the construction.
- the first stack of fins and the at least one further stack of fins are joined to one another via at least one side section.
- a side section is also very conducive to the mechanical stiffness of the construction.
- the present invention further provides a process for producing a heat exchanger designed in accordance with the invention, in which the first fins and the second fins are produced simultaneously in a single fin compression device, for example using a fin compression mold that defines both features of the first fins and features of the second fins. In this way, very effective manufacture of the heat exchanger of the invention is achieved.
- the first pipe conduits and the second pipe conduits are advantageously expanded simultaneously in a pipe conduit expansion machine. Such simultaneous expansion is also very conducive to effective manufacture of the heat exchanger of the invention.
- the present invention additionally provides a power plant having a generator cooled by means of a generator cooling gas and a heat exchanger of the invention that cools the generator cooling gas.
- the first cooling medium that flows through the heat exchanger is cooling water
- the second cooling medium that flows through the heat exchanger is a coolant, for example tetrafluoromethane (R-134a) or carbon dioxide.
- FIG. 1 a schematic view of a power plant in one embodiment of the present invention
- FIG. 2 a schematic view of one embodiment of a heat exchanger of the invention in the power plant shown in FIG. 1 ;
- FIG. 3 a schematic side view in the direction of the arrow III in FIG. 2 , showing a first stack of fins and a second stack of fins of the heat exchanger, omitting struts and an upper and lower cover for illustration purposes;
- FIG. 4 a top view of a first fin of a first stack of fins of the heat exchanger shown in FIG. 2 ;
- FIG. 5 a top view of a second fin of a further stack of fins of the heat exchanger shown in FIG. 2 ;
- FIG. 6 a schematic view of a fin production machine for production of the fins shown in FIGS. 4 and 5 ;
- FIG. 7 a schematic perspective view of a fin compression mold of the fin production machine shown in FIG. 6 ;
- FIG. 8 a schematic view of pipe conduit expansion tools of a pipe conduit expansion machine.
- FIG. 1 shows a power plant 1 in one embodiment of the present invention.
- the power plant 1 in the present case is a gas turbine power plant, which may in principle likewise be any type of power plant.
- the power plant 1 comprises an air compressor 2 , a gas turbine 3 , a generator 4 and a transformer 5 .
- air compressed by the air compressor 2 is mixed with fuel in a known manner, and the air-fuel mixture is ignited.
- the resultant combustion gas is supplied to the gas turbine 3 , where it is expanded to drive a gas turbine rotor 6 .
- the gas turbine rotor 6 drives the rotor 46 of the generator 4 , which converts the kinetic energy to electrical energy.
- the transformer 5 transforms the electrical energy in such a way that it can be fed to a power supply grid.
- the generator 4 is supplied by DC power in operation via contact rings or a brushless exciter 47 .
- the generator 4 is cooled using generator cooling gas, which is circulated through a generator cooling circuit 7 by means that are not shown in detail.
- the generator cooling gas is recooled by provision of a heat exchanger 8 in one embodiment of the present invention.
- the generator cooling gas is cooled firstly using cooling water that circulates in a cooling water circuit 9 , and secondly by means of a coolant that circulates in a coolant circuit 10 .
- the cooling water circuit 9 in the present case is what is called the intermediate cooling water circuit of the power plant 1 , to which further heat exchangers are also connected, by means of which lubricant oil, sealing oil, pumps and/or other components of the power plant 1 , for example, are cooled.
- the coolant circuit 10 through which the coolant flows comprises a cooling unit for recooling of the coolant.
- the coolant used in the present context is tetrafluoroethane (R-134a).
- R-134a tetrafluoroethane
- the generator cooling gas removes heat from the generator 4 , is recooled in the heat exchanger 8 and then is guided back into the generator 4 .
- the heat withdrawn from the generator cooling gas is transferred firstly to the cooling water that flows through the cooling water circuit 9 and secondly to the coolant that flows through the coolant circuit 10 .
- a significant advantage of the power plant 1 shown in FIG. 1 is that the generator cooling gas that flows through the generator cooling gas circuit 7 is recooled not solely by means of cooling water but additionally by means of a coolant. In this way, the cold gas temperature of the generator cooling gas on entry into the generator 4 is adjustable or controllable very flexibly and as required.
- a further advantage is that the generator cooling gas is recooled by the cooling water and by the coolant in a single heat exchanger 8 , since the use of a single heat exchanger 8 saves construction space.
- FIG. 2 shows one possible design of a heat exchanger 8 of the invention.
- the heat exchanger 8 through which a generator cooling gas flows in a flow direction indicated by the arrows 11 comprises a first stack of fins 12 having a multitude of first fins 14 stacked in a stacking direction that extends transverse to the flow direction indicated by the arrow 13 .
- the first fins 14 as shown in FIG. 4 , are each provided with a multitude of first passage holes 15 that are flush with one another in stacking direction.
- the heat exchanger 8 further comprises at least one further stack of fins 16 arranged adjacent to the first stack of fins 12 in flow direction and having a multitude of second fins 17 stacked in the stacking direction, wherein the second fins 17 are each provided with a multitude of second passage holes 18 that are flush with one another in stacking direction.
- the first fins 14 and the second fins 17 are each produced from sheet material, in the present case from aluminum, wherein the first fins 14 and/or the second fins 17 may be provided with a coating on one or both sides.
- the first fins 14 differ from the second fins 17 firstly in that they have a greater area.
- the surfaces of the first fins 14 , apart from the first passage holes 15 in the present case are smooth, whereas the surfaces of the second fins 17 are structured.
- the structuring in the working example presented is defined by elevated regions 19 that are slotted at the side and are provided in the upward direction, which increases the surface areas of the second fins 17 and influences the flow of the generator cooling gas through the further stack of fins 16 .
- the design of the surfaces both of the first fins 14 and of the second fins 17 may in principle vary as required. A further difference is that a distance a 1 between the first fins 14 in stacking direction is greater than a distance a 2 between the second fins 17 in stacking direction. Furthermore, the arrangement patterns of the first passage holes 15 differ from the arrangement patterns of the second passage holes 18 , as apparent from FIGS. 3 and 4 .
- the heat exchanger 8 further comprises first pipe conduits 20 that extend through the first passage holes 15 of the first fins 14 of the first stack of fins 12 and are press-fitted with the first fins 14 , and second passage holes 21 that extend through the second passage holes 18 of the second fins of the at least one further stack of fins 16 and are press-fitted with the second fins 17 .
- the first pipe conduits are each connected to one another via U-shaped connecting conduits 22 , and the cooling water flows through them successively, entering the first stack of fins 12 in the direction of the arrow 23 and exiting therefrom in the direction of the arrow 24 .
- the second pipe conduits 21 are each connected to one another by U-shaped connecting conduits 25 , and the coolant flows through them successively, entering the further stack of fins 16 in the direction of the arrow 26 and exiting therefrom in the direction of the arrow 27 .
- the first pipe conduits 20 and the second pipe conduits 21 have each been produced from a metallic material, from copper in the present case, where the flow cross section of the first pipe conduits 20 is greater than the flow cross section of the second pipe conduits 21 .
- the inner faces of the first pipe conduits 20 and/or the inner faces of the second pipe conduits 21 may be structured in order to increase their surface area.
- the heat exchanger 8 additionally comprises an upper cover and lower cover 28 , each of which connect the first stack of fins 12 and the further stack of fins 16 to one another.
- the covers 28 are respectively placed onto the outer first fins 14 of the first stack of fins 12 and onto the adjacent outer second fins 17 of the further stack of fins 16 in stacking direction from the bottom and from the top, and cover these fins 14 and 17 .
- the covers 28 have been provided with first passage openings 29 that are arranged and formed so as to correspond to the first passage holes 15 of the first fins 14 of the first stack of fins 12 , through which the first pipe conduits 20 are conducted, and with second passage openings 30 that are arranged and formed so as to correspond to the second passage holes 18 of the second fins 17 of the further stack of fins 16 , through which the second pipe conduits 21 are conducted.
- the covers 28 have been produced from a metallic material, in the present case each from a metal sheet of aluminum.
- FIG. 6 shows a schematic of a fin production machine 34 with a sheet metal roll accommodation device 36 that accommodates a roll of sheet metal 35 , a sheet metal conveying device 37 , a fin pressing device 38 having an upper fin press mold 39 and a lower fin press mold 40 , a fin transport device 41 and a fin stacking device 42 .
- the fin press molds 39 and 40 have different regions A 1 , A 2 , A 3 , A 4 , B 1 , B 2 , B 3 and B 4 , which form features of the fins 14 and 17 .
- the regions identified by A form features of the first fin 14
- the regions identified by B form features of the second fin 17 .
- the regions identified by number 1 form slots in the sheet metal; the regions identified by number 2 expand slotted regions; the regions identified by number 3 perform deep drawing of the sheet metal.
- the first fins 14 and second fins 17 manufactured in this way in the fin pressing device 38 are then moved using the fin transport device 41 to the fin stacking device 42 , where the first fins 14 and the second fins 17 are respectively stacked one on top of another.
- the stacked fins 14 and 17 are then moved to a pipe conduit expansion machine 43 .
- the pipe conduits 20 and 21 that have been introduced in the meantime into the corresponding passage holes 15 , 18 of the stacked fins 14 , 17 are expanded simultaneously therein using suitably shaped pipe conduit expansion tools 44 by pushing the pipe conduit expansion tools 44 through the pipe conduits 20 , 21 from the top in the direction of the arrows 45 .
- the covers 28 , the struts 33 and the connecting conduits 22 , 25 are mounted.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Geometry (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
- This application is the US National Stage of International Application No. PCT/EP2020/063124 filed 12 May 2020, and claims the benefit thereof. The International Application claims the benefit of German Application No. DE 10 2019 208 619.5 filed 13 Jun. 2019. All of the applications are incorporated by reference herein in their entirety.
- The present invention relates to a heat exchanger through which a medium to be cooled flows in a flow direction during operation thereof. The present invention further relates to a process for producing such a heat exchanger. The invention additionally relates to a power plant having a generator cooled by means of a generator cooling gas and a heat exchanger that cools the generator cooling gas.
- Power plants, for example gas turbine power plants, steam turbine power plants, combined gas and steam turbine power plants, solar power plants or the like, comprise a multitude of components that require cooling, in order firstly to remove the waste heat that arises and secondly to increase the output of the power plant. This is also true of the generator used for power generation, which is generally cooled with generator cooling gas recooled by means of a heat exchanger. The heat exchanger is usually connected to a closed cooling water system of the power plant, via which further heat exchangers are also supplied with cooling water for example those for lubricant oil and/or sealing oil cooling, for cooling of pumps or the like. The cooling water of the cooling water circuit can be re-cooled in various ways, for example by means of fresh water flow cooling, circulation cooling using a cooling tower or air-cooled coolers, etc.
- A possible achievable electrical power in the generator depends on the cold gas temperature of the generator cooling gas defined for cooling of the generator windings, i.e. the generator cooling gas temperature on entry into the generator. The lower the cold gas temperature, the more mechanical energy can be converted to electrical energy in the generator. The generator cooling gas is recooled as described above within a heat exchanger, through which cooling water from the cooling system of the power plant flows. Thus, the cold gas temperature of the generator cooling gas is coupled to the cooling water temperature of the cooling water flowing through the heat exchanger. The cooling water temperature in turn is dependent on the recooling of the cooling water and consequently cannot be lowered at will. There are thus limits to the electrical power achievable in the generator.
- If power-increasing measures on the turbine of the power plant result in a rise in mechanical power at the generator shaft, it would be desirable to provide improved cooling for the generator in order to be able to convert more power to electrical energy therewith.
- Proceeding from this prior art, it is an object of the present invention to provide improved cooling, especially improved generator cooling.
- This object is achieved by the present invention by providing a heat exchanger comprising a first stack of fins having a multitude of first fins stacked in a stacking direction that extends transverse to the flow direction, wherein the first fins are each provided with a multitude of first passage holes that are flush with one another in stacking direction, at least one further stack of fins arranged adjacent to the first stack of fins in flow direction, and having a multitude of second fins stacked in the stacking direction, wherein the second fins are each provided with a multitude of second passage holes that are flush with one another in stacking direction, first pipe conduits that extend through the first passage holes of the first fins of the first stack of fins and are press-fitted with the first fins, second pipe conduits that extend through the second passage holes of the second fins of the at least one further stack of fins and are press-fitted with the second fins, wherein the first pipe conduits and the second pipe conduits are not connected to one another for flow purposes and are provided for passage of a first cooling medium and a second cooling medium, wherein the cooling media are different from one another, and at least one cover that connects the first stack of fins and the at least one further stack of fins to one another, which is placed atop an outer first fin of the first stack of fins and atop the adjacent outer second fin of the at least one further stack of fins and covers these fins, wherein the at least one cover has been provided with first passage holes arranged and formed so as to correspond to the first passage holes of the first fins of the first stack of fins, through which the first pipe conduits are guided, and has been provided with second passage holes arranged and formed so as to correspond to the second passage holes of the second fins of the at least one further stack of fins, through which the second pipe conduits are guided.
- Such a heat exchanger is advantageous in that it can be operated with two different cooling media. The first cooling medium may be cooling water, for example. The second cooling medium used may, for example, be a coolant which is recooled in a cooling unit. If the medium to be cooled is generator cooling gas, the cold gas temperature thereof on entry into the generator is not limited by the degree of recooling of the cooling water of the cooling water system of the power plant. Instead, the cold gas temperature of the generator cooling gas can be lowered further via heat exchange with the coolant that flows through the heat exchanger, such that it can be adapted flexibly to the cooling demand of the generator if, for example, power-increasing measures are undertaken on the turbine. A further advantage of the heat exchanger of the invention is that the mechanical coupling of the stacks of fins through which the different cooling media flow via the at least one cover imparts very good mechanical stiffness to both stacks of fins with a simultaneously very inexpensive construction of low volume, even if one of the stacks of fins in itself should have only very low intrinsic stiffness, for example, on account of low construction depth. This is important especially when an existing heat exchanger in which the generator cooling gas has to date been recooled by means of cooling water only is to be replaced by a heat exchanger of the invention in order to lower the cold gas temperature of the generator cooling gas by additional cooling by means of a coolant. In such cases, the construction space available is defined by the dimensions of the old heat exchanger and is very limited. Correspondingly, barely any space is available for a stack of fins through which a second cooling medium flows, and therefore this second stack of fins can frequently be executed only with a very low construction depth, which leads to low intrinsic stiffness.
- In one configuration of the heat exchanger of the invention, the first fins have a greater area than the second fins. In other words, the dimensions of the fins of the respective stacks of fins are matched to the respective cooling medium.
- The design of the surface of the first fins is advantageously different than the design of the surface of the second fins. In this way too, it is possible to achieve adaptation of the stacks of fins to the respective cooling medium.
- Advantageously, the first fins and the second fins have been produced from a sheet material, for example from aluminum, in order to achieve good thermal conductivity.
- In one configuration of the heat exchanger of the invention, a distance between the first fins in stacking direction is different than the distance between the second fins in stacking direction, advantageously greater.
- According to the invention, the first fins and the second fins may have been produced from a sheet material having a coating on one or both sides.
- The first pipe conduits are each connected to one another via U-shaped connecting conduits, and the first cooling medium flows through them successively, and/or the second pipe conduits are each connected to one another by U-shaped connecting conduits, and the second cooling medium flows through them successively.
- The flow cross section of the first pipe conduits is advantageously different than the flow cross section of the second pipe conduits, advantageously greater.
- In one configuration of the present invention, the first pipe conduits and the second pipe conduits have been produced from a metallic material, advantageously from copper, which achieves good thermal conductivity.
- Advantageously, the inner faces of the first pipe conduits and/or the inner faces of the second pipe conduits are structured in order to increase their size, which is conducive to better heat transfer.
- An arrangement pattern of the first passage holes advantageously differs from the arrangement pattern of the second passage holes.
- The at least one cover has advantageously been produced from a metallic material, advantageously from a metal sheet. This leads to a simple and inexpensive construction of the at least one cover.
- Advantageously, the at least one cover encompasses the first stack of fins and the at least one further stack of fins on opposite sides, which further increases the mechanical stiffness of the construction.
- In one configuration of the present invention, the first stack of fins and the at least one further stack of fins are joined to one another via at least one side section. Such a side section is also very conducive to the mechanical stiffness of the construction.
- The present invention further provides a process for producing a heat exchanger designed in accordance with the invention, in which the first fins and the second fins are produced simultaneously in a single fin compression device, for example using a fin compression mold that defines both features of the first fins and features of the second fins. In this way, very effective manufacture of the heat exchanger of the invention is achieved.
- The first pipe conduits and the second pipe conduits are advantageously expanded simultaneously in a pipe conduit expansion machine. Such simultaneous expansion is also very conducive to effective manufacture of the heat exchanger of the invention.
- The present invention additionally provides a power plant having a generator cooled by means of a generator cooling gas and a heat exchanger of the invention that cools the generator cooling gas.
- Advantageously, the first cooling medium that flows through the heat exchanger is cooling water, and the second cooling medium that flows through the heat exchanger is a coolant, for example tetrafluoromethane (R-134a) or carbon dioxide.
- Further features and advantages of the present invention become clear from the description that follows with reference to the appended drawings.
- The figures show:
-
FIG. 1 a schematic view of a power plant in one embodiment of the present invention; -
FIG. 2 a schematic view of one embodiment of a heat exchanger of the invention in the power plant shown inFIG. 1 ; -
FIG. 3 a schematic side view in the direction of the arrow III inFIG. 2 , showing a first stack of fins and a second stack of fins of the heat exchanger, omitting struts and an upper and lower cover for illustration purposes; -
FIG. 4 a top view of a first fin of a first stack of fins of the heat exchanger shown inFIG. 2 ; -
FIG. 5 a top view of a second fin of a further stack of fins of the heat exchanger shown inFIG. 2 ; -
FIG. 6 a schematic view of a fin production machine for production of the fins shown inFIGS. 4 and 5 ; -
FIG. 7 a schematic perspective view of a fin compression mold of the fin production machine shown inFIG. 6 ; and -
FIG. 8 a schematic view of pipe conduit expansion tools of a pipe conduit expansion machine. -
FIG. 1 shows a power plant 1 in one embodiment of the present invention. The power plant 1 in the present case is a gas turbine power plant, which may in principle likewise be any type of power plant. The power plant 1 comprises anair compressor 2, a gas turbine 3, a generator 4 and a transformer 5. During the operation of the power plant 1, air compressed by theair compressor 2 is mixed with fuel in a known manner, and the air-fuel mixture is ignited. The resultant combustion gas is supplied to the gas turbine 3, where it is expanded to drive a gas turbine rotor 6. The gas turbine rotor 6 drives therotor 46 of the generator 4, which converts the kinetic energy to electrical energy. The transformer 5 transforms the electrical energy in such a way that it can be fed to a power supply grid. The generator 4 is supplied by DC power in operation via contact rings or abrushless exciter 47. - The generator 4 is cooled using generator cooling gas, which is circulated through a generator cooling circuit 7 by means that are not shown in detail. The generator cooling gas is recooled by provision of a
heat exchanger 8 in one embodiment of the present invention. In theheat exchanger 8, the generator cooling gas is cooled firstly using cooling water that circulates in acooling water circuit 9, and secondly by means of a coolant that circulates in acoolant circuit 10. The coolingwater circuit 9 in the present case is what is called the intermediate cooling water circuit of the power plant 1, to which further heat exchangers are also connected, by means of which lubricant oil, sealing oil, pumps and/or other components of the power plant 1, for example, are cooled. Thecoolant circuit 10 through which the coolant flows comprises a cooling unit for recooling of the coolant. The coolant used in the present context is tetrafluoroethane (R-134a). Alternatively, it is also possible to use another coolant such as carbon dioxide, to give just one example. - During the operation of the power plant 1, the generator cooling gas removes heat from the generator 4, is recooled in the
heat exchanger 8 and then is guided back into the generator 4. In theheat exchanger 8, the heat withdrawn from the generator cooling gas is transferred firstly to the cooling water that flows through the coolingwater circuit 9 and secondly to the coolant that flows through thecoolant circuit 10. - A significant advantage of the power plant 1 shown in
FIG. 1 is that the generator cooling gas that flows through the generator cooling gas circuit 7 is recooled not solely by means of cooling water but additionally by means of a coolant. In this way, the cold gas temperature of the generator cooling gas on entry into the generator 4 is adjustable or controllable very flexibly and as required. A further advantage is that the generator cooling gas is recooled by the cooling water and by the coolant in asingle heat exchanger 8, since the use of asingle heat exchanger 8 saves construction space. This is of particular importance especially when an existing heat exchanger of a power plant in which the recooling is effected solely using cooling water is to be replaced by a heat exchanger of the invention, since the construction space that is then available is defined by the dimensions of the old heat exchanger and is correspondingly limited. -
FIG. 2 shows one possible design of aheat exchanger 8 of the invention. Theheat exchanger 8 through which a generator cooling gas flows in a flow direction indicated by thearrows 11 comprises a first stack offins 12 having a multitude offirst fins 14 stacked in a stacking direction that extends transverse to the flow direction indicated by thearrow 13. Thefirst fins 14, as shown inFIG. 4 , are each provided with a multitude of first passage holes 15 that are flush with one another in stacking direction. Theheat exchanger 8 further comprises at least one further stack offins 16 arranged adjacent to the first stack offins 12 in flow direction and having a multitude ofsecond fins 17 stacked in the stacking direction, wherein thesecond fins 17 are each provided with a multitude of second passage holes 18 that are flush with one another in stacking direction. - The
first fins 14 and thesecond fins 17 are each produced from sheet material, in the present case from aluminum, wherein thefirst fins 14 and/or thesecond fins 17 may be provided with a coating on one or both sides. Thefirst fins 14 differ from thesecond fins 17 firstly in that they have a greater area. Secondly, the surfaces of thefirst fins 14, apart from the first passage holes 15, in the present case are smooth, whereas the surfaces of thesecond fins 17 are structured. The structuring in the working example presented is defined byelevated regions 19 that are slotted at the side and are provided in the upward direction, which increases the surface areas of thesecond fins 17 and influences the flow of the generator cooling gas through the further stack offins 16. However, it should be pointed out that the design of the surfaces both of thefirst fins 14 and of thesecond fins 17 may in principle vary as required. A further difference is that a distance a1 between thefirst fins 14 in stacking direction is greater than a distance a2 between thesecond fins 17 in stacking direction. Furthermore, the arrangement patterns of the first passage holes 15 differ from the arrangement patterns of the second passage holes 18, as apparent fromFIGS. 3 and 4 . - The
heat exchanger 8 further comprisesfirst pipe conduits 20 that extend through the first passage holes 15 of thefirst fins 14 of the first stack offins 12 and are press-fitted with thefirst fins 14, and second passage holes 21 that extend through the second passage holes 18 of the second fins of the at least one further stack offins 16 and are press-fitted with thesecond fins 17. The first pipe conduits are each connected to one another viaU-shaped connecting conduits 22, and the cooling water flows through them successively, entering the first stack offins 12 in the direction of thearrow 23 and exiting therefrom in the direction of thearrow 24. Thesecond pipe conduits 21 are each connected to one another byU-shaped connecting conduits 25, and the coolant flows through them successively, entering the further stack offins 16 in the direction of thearrow 26 and exiting therefrom in the direction of thearrow 27. Thefirst pipe conduits 20 and thesecond pipe conduits 21 have each been produced from a metallic material, from copper in the present case, where the flow cross section of thefirst pipe conduits 20 is greater than the flow cross section of thesecond pipe conduits 21. The inner faces of thefirst pipe conduits 20 and/or the inner faces of thesecond pipe conduits 21 may be structured in order to increase their surface area. - The
heat exchanger 8 additionally comprises an upper cover andlower cover 28, each of which connect the first stack offins 12 and the further stack offins 16 to one another. Thecovers 28 are respectively placed onto the outerfirst fins 14 of the first stack offins 12 and onto the adjacent outersecond fins 17 of the further stack offins 16 in stacking direction from the bottom and from the top, and cover thesefins covers 28 have been provided withfirst passage openings 29 that are arranged and formed so as to correspond to the first passage holes 15 of thefirst fins 14 of the first stack offins 12, through which thefirst pipe conduits 20 are conducted, and withsecond passage openings 30 that are arranged and formed so as to correspond to the second passage holes 18 of thesecond fins 17 of the further stack offins 16, through which thesecond pipe conduits 21 are conducted. Thecovers 28 have been produced from a metallic material, in the present case each from a metal sheet of aluminum. They firstly havechamfers 31 that point in the direction of the stacks offins pipe conduits conduits covers 28 are connected to one another via struts 33 in the present case, which impart good mechanical stiffness to the heat exchanger. -
FIG. 6 shows a schematic of afin production machine 34 with a sheet metalroll accommodation device 36 that accommodates a roll ofsheet metal 35, a sheetmetal conveying device 37, a finpressing device 38 having an upperfin press mold 39 and a lowerfin press mold 40, afin transport device 41 and afin stacking device 42. - During the operation of the
fin production machine 34, sheet metal from which thefirst fins 14 and thesecond fins 17 are to be manufactured is unwound by means of the sheetmetal conveying device 37 from the roll ofsheet metal 35 that is held by the sheet metalroll accommodation device 36 and fed to thefin pressing device 38. Both thefirst fins 14 and thesecond fins 17 are formed therein by movement of thefin press molds FIG. 7 , thefin press molds fins first fin 14, and the regions identified by B form features of thesecond fin 17. The regions identified by number 1 form slots in the sheet metal; the regions identified bynumber 2 expand slotted regions; the regions identified by number 3 perform deep drawing of the sheet metal. Thefirst fins 14 andsecond fins 17 manufactured in this way in thefin pressing device 38 are then moved using thefin transport device 41 to thefin stacking device 42, where thefirst fins 14 and thesecond fins 17 are respectively stacked one on top of another. - The
stacked fins conduit expansion machine 43. Thepipe conduits fins conduit expansion tools 44 by pushing the pipeconduit expansion tools 44 through thepipe conduits arrows 45. - In further steps, the
covers 28, thestruts 33 and the connectingconduits - Even though the invention has been further illustrated and described in detail by the working example, the invention is not limited by the examples disclosed, and other variations may be derived therefrom by the person skilled in the art without departing from the scope of protection of the invention.
Claims (21)
Applications Claiming Priority (3)
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DE102019208619.5A DE102019208619A1 (en) | 2019-06-13 | 2019-06-13 | Heat exchanger, method for producing a heat exchanger and power plant with such a heat exchanger |
DE102019208619.5 | 2019-06-13 | ||
PCT/EP2020/063124 WO2020249340A1 (en) | 2019-06-13 | 2020-05-12 | Heat exchanger, method for producing a heat exchanger and power plant comprising such a heat exchanger |
Publications (1)
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US20220228809A1 true US20220228809A1 (en) | 2022-07-21 |
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ID=70918384
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US17/616,653 Abandoned US20220228809A1 (en) | 2019-06-13 | 2020-05-12 | Heat exchanger, method for producing a heat exchanger and power plant comprising such a heat exchanger |
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US (1) | US20220228809A1 (en) |
EP (1) | EP3959478A1 (en) |
DE (1) | DE102019208619A1 (en) |
WO (1) | WO2020249340A1 (en) |
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DE102004006276A1 (en) * | 2004-02-09 | 2005-08-25 | Linde Kältetechnik GmbH & Co. KG | Partially structured heat exchanger fins |
JPWO2013084397A1 (en) * | 2011-12-09 | 2015-04-27 | パナソニックIpマネジメント株式会社 | Air conditioner |
DE102012007063B4 (en) * | 2012-04-03 | 2020-07-09 | Technische Universität Ilmenau | Finned tube heat exchanger with improved heat transfer |
DE102014212085A1 (en) * | 2014-06-24 | 2015-12-24 | BSH Hausgeräte GmbH | Heat exchanger for a household appliance, method for producing such as well as household appliance with such |
DE102015210398A1 (en) * | 2015-06-05 | 2016-12-08 | Bombardier Transportation Gmbh | Thermoelectric generator for converting heat of a hot gas stream into electrical energy |
DE102015120334A1 (en) * | 2015-11-24 | 2017-05-24 | Valeo Klimasysteme Gmbh | heat exchangers |
CN106091742A (en) * | 2016-06-21 | 2016-11-09 | 四川长虹空调有限公司 | Become caliber heat-exchange device and pipe-line system |
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2019
- 2019-06-13 DE DE102019208619.5A patent/DE102019208619A1/en not_active Withdrawn
-
2020
- 2020-05-12 US US17/616,653 patent/US20220228809A1/en not_active Abandoned
- 2020-05-12 EP EP20728962.0A patent/EP3959478A1/en not_active Withdrawn
- 2020-05-12 WO PCT/EP2020/063124 patent/WO2020249340A1/en unknown
Patent Citations (8)
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US20020050351A1 (en) * | 2000-10-30 | 2002-05-02 | Mitsubishi Heavy Industries, Ltd. | Outdoor heat exchanger unit, outdoor unit, and gas heat pump type air conditioner |
WO2005106372A1 (en) * | 2004-04-28 | 2005-11-10 | Daikin Industries, Ltd. | Adsorption heat exchanger |
US20130037239A1 (en) * | 2010-04-26 | 2013-02-14 | Sharp Kabushiki Kaisha | Heat exchange device |
WO2014130281A1 (en) * | 2013-02-21 | 2014-08-28 | Carrier Corporation | Tube structures for heat exchanger |
US20150377563A1 (en) * | 2013-02-21 | 2015-12-31 | Carrier Corporation | Tube structures for heat exchanger |
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US20180235070A1 (en) * | 2017-02-16 | 2018-08-16 | Dell Products, Lp | Heat Exchanger for an Information Handling System |
Also Published As
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DE102019208619A1 (en) | 2020-12-17 |
WO2020249340A1 (en) | 2020-12-17 |
EP3959478A1 (en) | 2022-03-02 |
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