EP3812677B1 - Radiator for cooling a transformer or a choke - Google Patents

Radiator for cooling a transformer or a choke Download PDF

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Publication number
EP3812677B1
EP3812677B1 EP20198629.6A EP20198629A EP3812677B1 EP 3812677 B1 EP3812677 B1 EP 3812677B1 EP 20198629 A EP20198629 A EP 20198629A EP 3812677 B1 EP3812677 B1 EP 3812677B1
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EP
European Patent Office
Prior art keywords
radiator
elements
boundary layer
transformer
air
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.)
Active
Application number
EP20198629.6A
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German (de)
French (fr)
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EP3812677A1 (en
Inventor
Kurt KAINEDER
Florian BACHINGER
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Siemens Energy Global GmbH and Co KG
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Siemens Energy Global GmbH and Co KG
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Publication of EP3812677A1 publication Critical patent/EP3812677A1/en
Application granted granted Critical
Publication of EP3812677B1 publication Critical patent/EP3812677B1/en
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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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0308—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • 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
    • F28F1/122—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 being formed of wires
    • 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
    • F28F1/124—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 being formed of pins
    • 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
    • F28F1/34—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 obliquely
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
    • F28F13/185—Heat-exchange surfaces provided with microstructures or with porous coatings
    • 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
    • F28F3/022—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being wires or pins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • 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

Definitions

  • the invention relates to a method for a radiator or a choke coil, the radiator or the choke coil having a plurality of radiator elements through which an air stream can flow in parallel and arranged parallel to one another, and between two radiator elements at least one device for breaking up the boundary layer of the air stream flowing between the radiator elements. is provided.
  • the invention can also be used for radiators for cooling other electrical devices which are also cooled with a liquid coolant such as mineral oil or ester.
  • a radiator for a transformer is disclosed.
  • the radiator is equipped with a device for breaking up the boundary layer of an air flow that occurs between two radiator sections aligned parallel to one another.
  • radiators Power transformers are often cooled by radiators, that is, the heated coolant is led out of the power transformer housing, through a radiator and back into the housing. In the radiator, the heat is released into the surrounding air over large surfaces. The surrounding air can circulate solely due to the buoyancy (natural cooling) or be blown over the surfaces of the radiator by means of a fan (forced cooling).
  • the radiators are usually designed as panel radiators, where the air can flow between several panel-shaped radiator elements, while the coolant to be cooled is conducted in parallel through the radiator elements of a panel radiator.
  • the efficiency of the radiator depends significantly on three factors, first, heat transfer from the heated coolant to the wall of the radiator element, second, heat conduction from the inner to the outer surface of the radiator element, and third, heat transfer from the outer surface of the radiator element to the air. Since the radiators are usually made of metal and have a high thermal conductivity, the thermal resistance of the wall of the radiator section plays only a negligibly small role. Therefore, mainly the first and third factors can be influenced to increase the efficiency of the radiator. Increased efficiency can mean that the temperature of the coolant after the radiator is further reduced while the radiator remains the same, or that the cooling system or its radiator(s) are dimensioned smaller while the temperature of the coolant after the cooling system or its radiator(s) remains the same can or can.
  • the coolant often circulates naturally through the transformer and radiator(s) only due to the buoyancy of the warm coolant, which is why the hydraulic resistance of the radiator sections cannot be increased significantly.
  • An increase in the surface area of the radiator sections, for example through corrugated walls of the radiator sections, can therefore not be done arbitrarily.
  • the heat transfer from the radiator element to the air can be increased by fans in a known manner. Changing the spacing between the radiator sections can also improve efficiency in some cases, but is not always possible due to space limitations.
  • the starting point is a radiator for cooling a transformer, preferably a power transformer, or a choke coil.
  • the radiator has a plurality of radiator elements through which a coolant can flow in parallel and which are arranged parallel to one another. It is provided that at least one device for breaking up the boundary layer of the air flow that flows through between the radiator elements is provided between two radiator elements.
  • the devices are mounted outside the radiator members, they do not alter the hydraulic properties inside the radiator members.
  • the devices according to the invention can also be retrofitted to a radiator when it is or has already been in operation and does not have to be attached during the production of the radiator, ie not before the radiator sections are assembled into a radiator.
  • the device for breaking up the boundary layer can in a first embodiment of the invention run at least partially transversely to the surface of the radiator members, ie the devices must not run exclusively parallel to the surface of the radiator members.
  • the devices do not necessarily have to extend from a surface of a radiator member to the middle of the flow channel or beyond - viewed normal to the plane of the radiator members - because this could increase the air resistance too much. As a rule, it will be sufficient if the devices protrude to a quarter or a third into the flow channel between two radiator elements.
  • the device for breaking up the boundary layer could also be a plate which is arranged in the flow channel between two adjacent radiator members and is inclined at an angle with respect to the radiator members. Viewed in the flow direction of the air, the plate should likewise not take up more than a third, in particular not more than a quarter, of the width of the flow channel.
  • the cross section of the plate can be adjusted to the aerodynamic requirements.
  • the device for dissolving the boundary layer runs at least partially parallel to the surface of the radiator elements. It would therefore be conceivable to arrange plates or rods parallel to the radiator sections, but such a device should not have the entire length of the flow duct between two radiator sections, but should be shorter than this length, so that the flow conditions in the flow duct change and it becomes one Dissolution of the boundary layer of that air flow can come, which flows through between the radiator elements.
  • the cross section of the plate can be adjusted to the aerodynamic requirements.
  • the devices for breaking up the boundary layer are to be designed in such a way that the air resistance is not significantly increased.
  • the forced or natural airflow is reduced only slightly, while the improved heat transfer provides an overall benefit.
  • a device for breaking up the boundary layer is a rod, ie a component whose longitudinal dimension is a multiple of the transverse dimension.
  • the rod can be normal or at an angle to the surface of the radiator elements run.
  • the cross-section of the rod does not have to be circular, but can also be larger in the direction of flow of the air than transverse to the direction of flow, which reduces drag.
  • the rod can be shaped in such a way that a Karman vortex street forms behind it.
  • a simple embodiment according to the invention for retrofitting a radiator with at least one rod consists in the rod being clamped between two adjacent radiator sections.
  • the bar can largely bridge the distance between adjacent radiator elements, so that one or more openings through which the air can flow can be provided in the bar in order to reduce the air resistance.
  • the rod can also have a length which is only a third or a quarter of the distance between adjacent radiator elements, in which case no openings in the rod are necessary.
  • the rod may be attached to one radiator section and terminate in front of the adjacent radiator section.
  • post-attachment is effected, for example by welding or clamping to the edges of radiator sections.
  • a device for dissolving the boundary layer is a wire, ie also an object whose longitudinal dimension is a multiple of the transverse dimension.
  • a wire is flexible and can be formed into any shape. A wire is therefore also suitable for retrofitting.
  • a wire may be wrapped around one of the radiator members.
  • Another embodiment of the invention is that a paint is applied to the radiator members to increase the surface roughness as a means of dissolving the boundary layer.
  • the paint thus contains solids which are surrounded by the liquid phase of the fresh paint and then stick to the surface of the radiator element when the liquid phase of the paint dries. The solids protrude from the surface of the radiator element.
  • boundary layer dissolving devices can also be used on a radiator, such as rods and wires and a paint to increase surface roughness.
  • a radiator element such as rods and wires and a paint to increase surface roughness.
  • only one type of device can be used per radiator element, or several different types of device can be used per radiator element, such as a paint and at least one wire on the same radiator element.
  • the invention can be applied to different types of radiators. Provision can be made for at least two radiator elements to be designed in the form of plates. This would be the case, for example, with panel radiators and so-called corrugated iron boilers.
  • the device for dissolving the boundary layer can then run at least partially transversely to the plane of the radiator elements or at least partially parallel to the plane of the radiator elements.
  • radiator elements are tubular, as in the case of one tube radiator.
  • the device for breaking up the boundary layer can then run at least partially transversely to the longitudinal axis of the radiator elements or at least partially parallel to the longitudinal axis of the radiator elements.
  • the method according to the invention for manufacturing a radiator is carried out by attaching the device for dissolving the boundary layer to a radiator which is already in operation and connected to a transformer.
  • At least one rod can be clamped between two adjacent radiator sections, and/or at least one wire can be wound around one of the radiator sections, and/or at least one plate can be mounted between two adjacent radiator sections, and/or at least one radiator section with a Paint to increase the surface roughness.
  • the transformer 1 shows a schematic representation of a transformer 1.
  • the transformer 1 has at least one transformer winding 2, which is wound around a core 10.
  • the transformer winding 2 consists, for example, of a low-voltage winding and a high-voltage winding (not shown).
  • the transformer 1 has a housing 3 that is filled with a coolant 4 .
  • an expansion tank 11 is provided, which is arranged in direct connection to the housing 3 above the latter. The expansion vessel 11 can be omitted if the radiator(s) 6 is dimensioned appropriately.
  • a cooling circuit is provided.
  • the cooling circuit has a riser pipe 12 as a riser section, and a return pipe 13 back into the housing 3 is also provided.
  • At least one radiator 6 is provided between riser pipe 12 and return pipe 13 .
  • the radiator 6 comprises a plurality of plate-shaped radiator elements 5 through which the flow occurs parallel to one another.
  • the radiator elements 5 are generally also arranged parallel to one another.
  • the cooling air flows between the radiator elements 5 parallel to the radiator elements 5 .
  • the plane of the radiator elements runs here in each case perpendicularly in the plane of the drawing.
  • a pump 7 for suction and suction of the coolant 4 can be arranged in the cooling circuit, e.g.
  • the device can be, for example, a rod 8 arranged transversely to the plane of the radiator members 5, and thus transversely to the air flow.
  • the rod 8 can be arranged normal or at an angle to the plane of the radiator members 5.
  • the bar can start from one radiator element 5 and end in front of the adjacent radiator element 5 .
  • several bars 8 can be provided between two adjacent radiator members 5 .
  • the device for dissolving the boundary layer can also be a wire 9 which is wound around a radiator member 5 on the outside.
  • a wire 9 which is wound around a radiator member 5 on the outside.
  • several wires 9 can also be wound around a radiator element 5, or one wire 9 can also be wound around several radiator elements 5.
  • the means for dissolving the boundary layer may also comprise a plate 14 placed between two radiator members 5, here parallel to the radiator members 5.
  • Rods 8 and/or wires 9 and/or plates 14 and/or other devices for dissolving the boundary layer for a radiator element 5 can also be combined. And it can too Rods 8 and/or wires 9 and/or plates 14 and/or other devices for dissolving the boundary layer for a radiator 6 can be combined.
  • radiator 3 shows a well-known corrugated iron tank for a transformer or a choke, on the housing 3 of which a multiplicity of plate-shaped radiator elements 5 are arranged on both longitudinal sides over the entire height of the housing 3 .
  • the radiator elements 5 on one side thus form a radiator 6, so to speak, in which all radiator elements 5 can be flowed through in parallel by the coolant.
  • a device for breaking up the boundary layer is shown here as an example as a plate 14 between two radiator elements 5 .
  • Such plates 14 could also be arranged between the remaining radiator elements 5, and/or other devices for breaking up the boundary layer.

Description

GEBIET DER ERFINDUNGFIELD OF THE INVENTION

Die Erfindung betrifft ein Verfahren für einen Radiator oder eine Drosselspule, wobei der Radiator oder die Drosselspule mehrere parallel von einem Luftstrom durchströmbare und parallel zueinander angeordnete Radiatorglieder aufweist und zwischen zwei Radiatorgliedern zumindest eine Einrichtung zum Auflösen der Grenzschicht jenes Luftstroms, der zwischen den Radiatorgliedern strömt, vorgesehen ist.The invention relates to a method for a radiator or a choke coil, the radiator or the choke coil having a plurality of radiator elements through which an air stream can flow in parallel and arranged parallel to one another, and between two radiator elements at least one device for breaking up the boundary layer of the air stream flowing between the radiator elements. is provided.

Die Erfindung kann auch für Radiatoren zur Kühlung von anderen elektrischen Einrichtungen verwendet werden, die ebenfalls mit einem flüssigen Kühlmittel, wie Mineralöl oder Ester, gekühlt werden.The invention can also be used for radiators for cooling other electrical devices which are also cooled with a liquid coolant such as mineral oil or ester.

STAND DER TECHNIKSTATE OF THE ART

In der US 2012/312515 A1 ist ein Radiator für einen Transformator offenbart. Der Radiator ist mit einer Einrichtung zum Auflösen der Grenzschicht eines Luftstromes eingerichtet, der sich zwischen zwei parallel zueinander ausgerichteten Radiatorgliedern einstellt.In the U.S. 2012/312515 A1 a radiator for a transformer is disclosed. The radiator is equipped with a device for breaking up the boundary layer of an air flow that occurs between two radiator sections aligned parallel to one another.

Weiterer Stand der Technik ist aus der EP 0671748 , US 1,461,518 A , DE 102005002005 A1 und WO 2009/137892 A1 bekannt.Further prior art is from EP 0671748 , US 1,461,518A , DE 102005002005 A1 and WO 2009/137892 A1 known.

Leistungstransformatoren werden häufig durch Radiatoren gekühlt, das heißt, das erwärmte Kühlmittel wird aus dem Gehäuse des Leistungstransformators heraus, durch einen Radiator und wieder zurück in das Gehäuse geführt. Im Radiator wird die Wärme über große Oberflächen an die umgebende Luft abgegeben. Dabei kann die umgebende Luft alleine aufgrund des Auftriebs (natürliche Kühlung) zirkulieren oder mittels Lüfter (forcierte Kühlung) über die Oberflächen des Radiators geblasen werden. Die Radiatoren sind meist als Plattenradiatoren ausgebildet, wo die Luft zwischen mehreren plattenförmigen Radiatorgliedern hindurch strömen kann, während das zu kühlende Kühlmittel parallel durch die Radiatorglieder eines Plattenradiators geleitet wird.Power transformers are often cooled by radiators, that is, the heated coolant is led out of the power transformer housing, through a radiator and back into the housing. In the radiator, the heat is released into the surrounding air over large surfaces. The surrounding air can circulate solely due to the buoyancy (natural cooling) or be blown over the surfaces of the radiator by means of a fan (forced cooling). The radiators are usually designed as panel radiators, where the air can flow between several panel-shaped radiator elements, while the coolant to be cooled is conducted in parallel through the radiator elements of a panel radiator.

Die Effizienz des Radiators hängt maßgeblich von drei Faktoren ab, erstens vom Wärmeübergang des erwärmten Kühlmittels auf die Wand des Radiatorglieds, zweitens von der Wärmeleitung von der inneren zur äußeren Oberfläche des Radiatorglieds, und drittens vom Wärmeübergang von der äußeren Oberfläche des Radiatorglieds an die Luft. Da die Radiatoren in der Regel aus Metall gefertigt sind und über eine hohe Wärmeleitfähigkeit verfügen, spielt der Wärmewiderstand der Wand des Radiatorglieds nur eine vernachlässigbar kleine Rolle. Deshalb können hauptsächlich der erste und der dritte Faktor beeinflusst werden, um die Effizienz des Radiators zu vergrößern. Eine vergrößerte Effizienz kann bedeuten, dass die Temperatur des Kühlmittels nach dem Radiator bei gleichbleibendem Radiator weiter reduziert wird, oder dass die Kühlanlage bzw. deren Radiator(en) bei gleichbleibender Temperatur des Kühlmittels nach der Kühlanlage bzw. deren Radiator(en) kleiner dimensioniert werden kann bzw. können.The efficiency of the radiator depends significantly on three factors, first, heat transfer from the heated coolant to the wall of the radiator element, second, heat conduction from the inner to the outer surface of the radiator element, and third, heat transfer from the outer surface of the radiator element to the air. Since the radiators are usually made of metal and have a high thermal conductivity, the thermal resistance of the wall of the radiator section plays only a negligibly small role. Therefore, mainly the first and third factors can be influenced to increase the efficiency of the radiator. Increased efficiency can mean that the temperature of the coolant after the radiator is further reduced while the radiator remains the same, or that the cooling system or its radiator(s) are dimensioned smaller while the temperature of the coolant after the cooling system or its radiator(s) remains the same can or can.

Dabei ist zu berücksichtigen, dass das Kühlmittel häufig natürlich durch den Transformator und den/die Radiator/en zirkuliert, also nur aufgrund des Auftriebs des warmen Kühlmittels, weshalb der hydraulische Widerstand der Radiatorglieder nicht wesentlich erhöht werden kann. Eine Erhöhung der Oberfläche der Radiatorglieder, etwa durch gewellte Wände der Radiatorglieder, kann deshalb nicht beliebig erfolgen. Der Wärmeübergang vom Radiatorglied auf die Luft kann bekannter Weise durch Lüfter erhöht werden. Auch die Änderung der Abstände zwischen den Radiatorgliedern kann in manchen Fällen die Effizienz verbessern, ist aber aufgrund eines begrenzten Bauraums nicht immer möglich.It should be noted that the coolant often circulates naturally through the transformer and radiator(s) only due to the buoyancy of the warm coolant, which is why the hydraulic resistance of the radiator sections cannot be increased significantly. An increase in the surface area of the radiator sections, for example through corrugated walls of the radiator sections, can therefore not be done arbitrarily. The heat transfer from the radiator element to the air can be increased by fans in a known manner. Changing the spacing between the radiator sections can also improve efficiency in some cases, but is not always possible due to space limitations.

DARSTELLUNG DER ERFINDUNGPRESENTATION OF THE INVENTION

Es ist Aufgabe der Erfindung, die Kühlleistung einen im Betrieb befindlichen Radiators zu verbessern.It is the object of the invention to improve the cooling performance of a radiator that is in operation.

Diese Aufgabe wird durch einen Verfahren nach Anspruch 1 gelöst. Ausgangspunkt ist ein Radiator zur Kühlung eines Transformators, vorzugsweise eines Leistungstransformators, oder einer Drosselspule, der Radiator weist mehrere parallel von einem Kühlmittel durchströmbare und parallel zueinander angeordnete Radiatorglieder auf. Dabei ist vorgesehen, dass zwischen zwei Radiatorgliedern zumindest eine Einrichtung zum Auflösen der Grenzschicht jenes Luftstroms, der zwischen den Radiatorgliedern durchströmt, vorgesehen ist.This object is achieved by a method according to claim 1. The starting point is a radiator for cooling a transformer, preferably a power transformer, or a choke coil. The radiator has a plurality of radiator elements through which a coolant can flow in parallel and which are arranged parallel to one another. It is provided that at least one device for breaking up the boundary layer of the air flow that flows through between the radiator elements is provided between two radiator elements.

Wenn Luft zwischen den Radiatorgliedern durchströmt, so bildet sich ein Temperaturprofil aus. Nach einer bestimmten Einströmlänge ist die Luft in der Nähe der Radiatorglieder viel wärmer als in der Mitte zwischen zwei benachbarten Radiatorgliedern. Durch Einrichtungen zum Auflösen der Grenzschicht wird die Lufttemperatur im Strömungskanal, der zwischen zwei benachbarten Radiatorgliedern gebildet wird, homogenisiert. Die relativ kalte Luft aus der Mitte des Strömungskanals gelangt zur Oberfläche der Radiatorglieder und ersetzt die warme Luft in der Grenzschicht zur Oberfläche des Radiatorglieds. Dadurch erhöht sich der Wärmeübergang zwischen Radiatorglied und Luft.When air flows between the radiator sections, a temperature profile is formed. After a certain inflow length, the air near the radiator sections is much warmer than in the middle between two adjacent radiator sections. The air temperature in the flow channel formed between two adjacent radiator members is homogenized by means for dissolving the boundary layer. The relatively cool air from the center of the flow channel passes to the surface of the radiator elements and replaces the warm air in the boundary layer to the surface of the radiator element. This increases the heat transfer between the radiator section and the air.

Da die Einrichtungen außerhalb der Radiatorglieder angebracht sind, verändern sie die hydraulischen Eigenschaften im Inneren der Radiatorglieder nicht. Auch können die erfindungsgemäßen Einrichtungen nachträglich an einem Radiator angebracht werden, wenn dieser schon im Betrieb ist oder war, und müssen nicht bereits bei der Produktion des Radiators angebracht werden, also nicht, bevor die Radiatorglieder zu einem Radiator zusammengebaut werden.Because the devices are mounted outside the radiator members, they do not alter the hydraulic properties inside the radiator members. The devices according to the invention can also be retrofitted to a radiator when it is or has already been in operation and does not have to be attached during the production of the radiator, ie not before the radiator sections are assembled into a radiator.

Damit eine Umlenkung der Luft auftritt, kann die Einrichtung zum Auflösen der Grenzschicht in einer ersten Ausführungsform der Erfindung zumindest teilweise quer zur Oberfläche der Radiatorglieder verlaufen, die Einrichtungen dürfen dabei also nicht ausschließlich parallel zur Oberfläche der Radiatorglieder verlaufen. Dabei müssen die Einrichtungen - normal zur Ebene der Radiatorglieder gesehen - von einer Oberfläche eines Radiatorglieds nicht unbedingt bis zur Mitte des Strömungskanals oder darüber hinaus reichen, weil dies den Luftwiderstand zu stark erhöhen könnte. In der Regel wird es ausreichen, wenn die Einrichtungen zu einem Viertel oder einem Drittel in den Strömungskanal zwischen zwei Radiatorgliedern ragen.In order for the air to be deflected, the device for breaking up the boundary layer can in a first embodiment of the invention run at least partially transversely to the surface of the radiator members, ie the devices must not run exclusively parallel to the surface of the radiator members. The devices do not necessarily have to extend from a surface of a radiator member to the middle of the flow channel or beyond - viewed normal to the plane of the radiator members - because this could increase the air resistance too much. As a rule, it will be sufficient if the devices protrude to a quarter or a third into the flow channel between two radiator elements.

Die Einrichtung zum Auflösen der Grenzschicht könnte aber auch eine Platte sein, die im Strömungskanal zwischen zwei benachbarten Radiatorgliedern angeordnet ist und um einen Winkel gegenüber den Radiatorgliedern geneigt ist. Dabei sollte die Platte in Strömungsrichtung der Luft gesehen ebenfalls nicht mehr als ein Drittel, insbesondere nicht mehr als ein Viertel, der Breite des Strömungskanals einnehmen. Der Querschnitt der Platte kann an die aerodynamischen Anforderungen angepasst werden.However, the device for breaking up the boundary layer could also be a plate which is arranged in the flow channel between two adjacent radiator members and is inclined at an angle with respect to the radiator members. Viewed in the flow direction of the air, the plate should likewise not take up more than a third, in particular not more than a quarter, of the width of the flow channel. The cross section of the plate can be adjusted to the aerodynamic requirements.

In einer anderen Ausführungsform ist vorgesehen, dass die Einrichtung zum Auflösen der Grenzschicht zumindest teilweise parallel zur Oberfläche der Radiatorglieder verläuft. Es wäre also denkbar, Platten oder Stäbe parallel zu den Radiatorgliedern anzuordnen, wobei eine solche Einrichtung aber nicht die gesamte Länge des Strömungskanals zwischen zwei Radiatorgliedern aufweisen soll, sondern kürzer als diese Länge sein soll, damit sich die Strömungsbedingungen im Strömungskanal ändern und es zu einem Auflösen der Grenzschicht jenes Luftstroms kommen kann, der zwischen den Radiatorgliedern durchströmt. Der Querschnitt der Platte kann an die aerodynamischen Anforderungen angepasst werden.In another embodiment it is provided that the device for dissolving the boundary layer runs at least partially parallel to the surface of the radiator elements. It would therefore be conceivable to arrange plates or rods parallel to the radiator sections, but such a device should not have the entire length of the flow duct between two radiator sections, but should be shorter than this length, so that the flow conditions in the flow duct change and it becomes one Dissolution of the boundary layer of that air flow can come, which flows through between the radiator elements. The cross section of the plate can be adjusted to the aerodynamic requirements.

Die Einrichtungen zum Auflösen der Grenzschicht sind so auszugestalten, dass der Luftwiderstand nicht wesentlich erhöht wird. Somit reduziert sich die forcierte oder natürliche Luftströmung nur geringfügig, während der verbesserte Wärmeübergang insgesamt einen Vorteil ergibt.The devices for breaking up the boundary layer are to be designed in such a way that the air resistance is not significantly increased. Thus, the forced or natural airflow is reduced only slightly, while the improved heat transfer provides an overall benefit.

Eine Ausführungsform sieht vor, dass eine Einrichtung zum Auflösen der Grenzschicht ein Stab ist, also ein Bauteil, dessen Längsabmessung ein Vielfaches der Querabmessung beträgt. Der Stab kann normal oder in einem Winkel zur Oberfläche der Radiatorglieder verlaufen. Der Querschnitt des Stabs muss nicht kreisförmig sein, sondern kann auch in Strömungsrichtung der Luft größer sein als quer zur Strömungsrichtung, was den Luftwiderstand verringert. Der Stab kann etwa so geformt sein, dass sich dahinter eine Karmansche Wirbelstraße bildet.One embodiment provides that a device for breaking up the boundary layer is a rod, ie a component whose longitudinal dimension is a multiple of the transverse dimension. The rod can be normal or at an angle to the surface of the radiator elements run. The cross-section of the rod does not have to be circular, but can also be larger in the direction of flow of the air than transverse to the direction of flow, which reduces drag. The rod can be shaped in such a way that a Karman vortex street forms behind it.

Eine erfindungsgemäß einfache Ausführungsform zur Nachrüstung eines Radiators mit zumindest einem Stab besteht darin, dass der Stab zwischen zwei benachbarte Radiatorglieder geklemmt wird. Dabei kann der Stab den Abstand zwischen benachbarten Radiatorgliedern großteils überbrücken, sodass zur Reduzierung des Luftwiderstands noch eine oder mehrere für die Luftströmung durchgängige Öffnungen im Stab vorgesehen sein können. Der Stab kann aber auch eine Länge haben, die nur ein Drittel oder ein Viertel des Abstands zwischen benachbarten Radiatorgliedern beträgt, dann sind keine Öffnungen im Stab nötig.A simple embodiment according to the invention for retrofitting a radiator with at least one rod consists in the rod being clamped between two adjacent radiator sections. In this case, the bar can largely bridge the distance between adjacent radiator elements, so that one or more openings through which the air can flow can be provided in the bar in order to reduce the air resistance. However, the rod can also have a length which is only a third or a quarter of the distance between adjacent radiator elements, in which case no openings in the rod are necessary.

Der Stab kann an einem Radiatorglied befestigt sein und vor dem benachbarten Radiatorglied enden.. Erfindungsgemäß erfolgt eine nachträgliche Befestigung, z.B. durch Schweißen oder Klemmen an die Ränder von Radiatorgliedern.The rod may be attached to one radiator section and terminate in front of the adjacent radiator section. According to the invention, post-attachment is effected, for example by welding or clamping to the edges of radiator sections.

Eine andere Ausführungsform besteht darin, dass eine Einrichtung zum Auflösen der Grenzschicht ein Draht ist, also ebenfalls ein Gegenstand, dessen Längsabmessung ein Vielfaches der Querabmessung beträgt. Anders als ein Stab ist ein Draht jedenfalls biegsam und kann in eine beliebige Form gebracht werden. Ein Draht eignet sich daher ebenfalls zur Nachrüstung.Another embodiment consists in that a device for dissolving the boundary layer is a wire, ie also an object whose longitudinal dimension is a multiple of the transverse dimension. However, unlike a rod, a wire is flexible and can be formed into any shape. A wire is therefore also suitable for retrofitting.

Insbesondere kann ein Draht in einer Ausführungsform der Erfindung um eines der Radiatorglieder gewickelt werden.In particular, in one embodiment of the invention, a wire may be wrapped around one of the radiator members.

Eine weitere Ausführungsform der Erfindung besteht darin, dass als Einrichtung zum Auflösen der Grenzschicht ein Anstrich zur Erhöhung der Oberflächenrauigkeit auf die Radiatorglieder aufgebracht wird. Der Anstrich enthält also Festkörper, die von der flüssigen Phase des frischen Anstrichs umschlossen werden und beim Trocknen der flüssigen Phase des Anstrichs dann an der Oberfläche des Radiatorglieds haften bleiben. Die Festkörper ragen dabei von der Oberfläche des Radiatorglieds ab.Another embodiment of the invention is that a paint is applied to the radiator members to increase the surface roughness as a means of dissolving the boundary layer. The paint thus contains solids which are surrounded by the liquid phase of the fresh paint and then stick to the surface of the radiator element when the liquid phase of the paint dries. The solids protrude from the surface of the radiator element.

Es können an einem Radiator auch verschiedene Arten von Einrichtungen zum Auflösen der Grenzschicht eingesetzt werden, also etwa Stäbe und Drähte und ein Anstrich zur Erhöhung der Oberflächenrauigkeit. Generell kann pro Radiatorglied nur jeweils eine Art der Einrichtung verwendet werden, oder es können pro Radiatorglied mehrere unterschiedliche Arten von Einrichtungen verwendet werden, etwa ein Anstrich und zumindest ein Draht auf dem gleichen Radiatorelement.Various types of boundary layer dissolving devices can also be used on a radiator, such as rods and wires and a paint to increase surface roughness. In general, only one type of device can be used per radiator element, or several different types of device can be used per radiator element, such as a paint and at least one wire on the same radiator element.

Die Erfindung kann auf unterschiedliche Typen von Radiatoren angewendet werden. Es kann vorgesehen sein, dass zumindest zwei Radiatorglieder plattenförmig ausgebildet sind. Dies wäre z.B. bei Plattenradiatoren und bei sogenannten Wellblechkesseln der Fall. Die Einrichtung zum Auflösen der Grenzschicht kann dann zumindest teilweise quer zur Ebene der Radiatorglieder verlaufen oder zumindest teilweise parallel zur Ebene der Radiatorglieder.The invention can be applied to different types of radiators. Provision can be made for at least two radiator elements to be designed in the form of plates. This would be the case, for example, with panel radiators and so-called corrugated iron boilers. The device for dissolving the boundary layer can then run at least partially transversely to the plane of the radiator elements or at least partially parallel to the plane of the radiator elements.

Es kann aber auch vorgesehen sein, dass zumindest zwei Radiatorglieder röhrenförmig ausgebildet sind, wie eben bei einem Röhrenradiator. Die Einrichtung zum Auflösen der Grenzschicht kann dann zumindest teilweise quer zur Längsachse der Radiatorglieder verlaufen oder zumindest teilweise parallel zur Längsachse der Radiatorglieder.However, it can also be provided that at least two radiator elements are tubular, as in the case of one tube radiator. The device for breaking up the boundary layer can then run at least partially transversely to the longitudinal axis of the radiator elements or at least partially parallel to the longitudinal axis of the radiator elements.

Das erfindungsgemäße Verfahren zur Herstellung eines Radiators erfolgt erfolgt, indem die Einrichtung zum Auflösen der Grenzschicht an einem Radiator angebracht wird, der bereits in Betrieb und mit einem Transformator verbunden ist.The method according to the invention for manufacturing a radiator is carried out by attaching the device for dissolving the boundary layer to a radiator which is already in operation and connected to a transformer.

So kann im Rahmen der Erfindung zumindest ein Stab zwischen zwei benachbarte Radiatorglieder geklemmt werden, und/oder zumindest ein Draht um eines der Radiatorglieder gewickelt werden, und/oder zumindest eine Platte zwischen zwei benachbarte Radiatorglieder montiert werden, und/oder zumindest ein Radiatorglied mit einem Anstrich zur Erhöhung der Oberflächenrauigkeit versehen werden.Thus, within the scope of the invention, at least one rod can be clamped between two adjacent radiator sections, and/or at least one wire can be wound around one of the radiator sections, and/or at least one plate can be mounted between two adjacent radiator sections, and/or at least one radiator section with a Paint to increase the surface roughness.

KURZE BESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES

Zur weiteren Erläuterung der Erfindung wird im nachfolgenden Teil der Beschreibung auf Figuren Bezug genommen, aus denen weitere vorteilhafte Einzelheiten und mögliche Einsatzgebiete der Erfindung zu entnehmen sind. Die Figuren sind als beispielhaft zu verstehen und sollen den Erfindungscharakter zwar darlegen, ihn aber keinesfalls einengen oder gar abschließend wiedergeben. Es zeigt:

Fig. 1
eine schematische Darstellung eines Transformators mit einem Radiator,
Fig. 2
eine schematische Darstellung eines erfindungsgemäßen Radiators,
Fig. 3
eine schematische Darstellung eines erfindungsgemäßen Wellblechkessels in perspektivischer Ansicht,
Fig. 4
den Wellblechkessel aus Fig. 3 von oben.
For further explanation of the invention, reference is made to figures in the following part of the description, from which further advantageous details and possible fields of application of the invention can be gathered. The figures are to be understood as examples and are intended to explain the character of the invention, but in no way restrict or even conclusively reproduce it. It shows:
1
a schematic representation of a transformer with a radiator,
2
a schematic representation of a radiator according to the invention,
3
a schematic representation of a corrugated iron boiler according to the invention in a perspective view,
4
the corrugated iron kettle 3 from above.

WEGE ZUR AUSFÜHRUNG DER ERFINDUNGWAYS TO CARRY OUT THE INVENTION

Fig. 1 zeigt eine schematische Darstellung eines Transformators 1. Der Transformator 1 verfügt über zumindest eine Transformatorwicklung 2, die um einen Kern 10 gewickelt ist. Die Transformatorwicklung 2 besteht z.B. aus einer nicht weiter dargestellten Unter- sowie Oberspannungswicklung. Darüber hinaus verfügt der Transformator 1 über ein Gehäuse 3, das mit einem Kühlmittel 4 befüllt ist. Zur Aufnahme des Kühlmittels 4 bei hohen Temperaturen ist ein Ausdehnungsgefäß 11 vorgesehen, das in direkter Verbindung zum Gehäuse 3 über diesem angeordnet ist. Das Ausdehnungsgefäß 11 kann bei entsprechender Dimensionierung des oder der Radiatoren 6 entfallen. 1 shows a schematic representation of a transformer 1. The transformer 1 has at least one transformer winding 2, which is wound around a core 10. The transformer winding 2 consists, for example, of a low-voltage winding and a high-voltage winding (not shown). In addition, the transformer 1 has a housing 3 that is filled with a coolant 4 . To accommodate the coolant 4 at high temperatures, an expansion tank 11 is provided, which is arranged in direct connection to the housing 3 above the latter. The expansion vessel 11 can be omitted if the radiator(s) 6 is dimensioned appropriately.

Ausgehend vom Gehäuse 3 ist ein Kühlkreislauf vorgesehen. Der Kühlkreislauf verfügt über ein Steigrohr 12 als Steigabschnitt, ferner ist ein Rückleitungsrohr 13 zurück in das Gehäuse 3 vorgesehen. Zwischen Steigrohr 12 und Rückleitungsrohr 13 ist zumindest ein Radiator 6 vorgesehen. Der Radiator 6 umfasst mehrere parallel zueinander durchströmte plattenförmige Radiatorglieder 5. Die Radiatorglieder 5 sind in der Regel auch parallel zueinander angeordnet. Zwischen den Radiatorgliedern 5 strömt die Kühlluft parallel zu den Radiatorgliedern 5 hindurch. Die Ebene der Radiatorglieder verläuft hier jeweils senkrecht in der Zeichenebene.Starting from the housing 3, a cooling circuit is provided. The cooling circuit has a riser pipe 12 as a riser section, and a return pipe 13 back into the housing 3 is also provided. At least one radiator 6 is provided between riser pipe 12 and return pipe 13 . The radiator 6 comprises a plurality of plate-shaped radiator elements 5 through which the flow occurs parallel to one another. The radiator elements 5 are generally also arranged parallel to one another. The cooling air flows between the radiator elements 5 parallel to the radiator elements 5 . The plane of the radiator elements runs here in each case perpendicularly in the plane of the drawing.

Weiters kann eine Pumpe 7 zum An- und Absaugen des Kühlmittels 4 im Kühlkreislauf angeordnet sein, z.B. im Rückleitungsrohr 13, wodurch es zu einer erzwungenen Zirkulation des Kühlmittels 4 innerhalb des Kühlkreislaufs und des Gehäuses 3 kommt.Furthermore, a pump 7 for suction and suction of the coolant 4 can be arranged in the cooling circuit, e.g.

Zwischen zwei Radiatorgliedern 5 ist nun, siehe Fig. 2, wo der Radiator 6 neben dem Gehäuse 3 angeordnet ist, zumindest eine Einrichtung zum Auflösen der Grenzschicht jenes Luftstroms angeordnet, der zwischen zwei Radiatorgliedern 5 durchströmt. Die Einrichtung kann beispielsweise ein quer zur Ebene der Radiatorglieder 5, und damit quer zum Luftstrom, angeordneter Stab 8 sein. Der Stab 8 kann normal oder in einem Winkel zur Ebene der Radiatorglieder 5 angeordnet sein. Der Stab kann von einem Radiatorglied 5 ausgehen und vor dem benachbarten Radiatorglied 5 enden. Selbstverständlich können mehrere Stäbe 8 zwischen zwei benachbarten Radiatorgliedern 5 vorgesehen sein.Between two radiator members 5 is now, see 2 , where the radiator 6 is arranged next to the housing 3, at least one device for breaking up the boundary layer of that air flow which flows between two radiator members 5 is arranged. The device can be, for example, a rod 8 arranged transversely to the plane of the radiator members 5, and thus transversely to the air flow. The rod 8 can be arranged normal or at an angle to the plane of the radiator members 5. The bar can start from one radiator element 5 and end in front of the adjacent radiator element 5 . Of course, several bars 8 can be provided between two adjacent radiator members 5 .

Die Einrichtung zum Auflösen der Grenzschicht kann auch ein Draht 9 sein, der außen um ein Radiatorglied 5 gewickelt wird. Selbstverständlich können auch mehrere Drähte 9 um ein Radiatorglied 5 gewickelt werden, oder es kann auch ein Draht 9 um mehrere Radiatorglieder 5 gewickelt werden.The device for dissolving the boundary layer can also be a wire 9 which is wound around a radiator member 5 on the outside. Of course, several wires 9 can also be wound around a radiator element 5, or one wire 9 can also be wound around several radiator elements 5.

Die Einrichtung zum Auflösen der Grenzschicht kann auch eine Platte 14 umfassen, die zwischen zwei Radiatorgliedern 5 angeordnet ist, hier parallel zu den Radiatorgliedern 5.The means for dissolving the boundary layer may also comprise a plate 14 placed between two radiator members 5, here parallel to the radiator members 5.

Es können auch Stäbe 8 und/oder Drähte 9 und/oder Platten 14 und/oder andere Einrichtungen zum Auflösen der Grenzschicht für ein Radiatorglied 5 kombiniert werden. Und es können auch Stäbe 8 und/oder Drähte 9 und/oder Platten 14 und/oder andere Einrichtungen zum Auflösen der Grenzschicht für einen Radiator 6 kombiniert werden.Rods 8 and/or wires 9 and/or plates 14 and/or other devices for dissolving the boundary layer for a radiator element 5 can also be combined. And it can too Rods 8 and/or wires 9 and/or plates 14 and/or other devices for dissolving the boundary layer for a radiator 6 can be combined.

Fig. 3 zeigt einen an sich bekannten Wellblechkessel für einen Transformator oder eine Drossel, an dessen Gehäuse 3 an beiden Längsseiten über die gesamte Höhe des Gehäuses 3 eine Vielzahl von plattenförmigen Radiatorgliedern 5 angeordnet ist. Das heißt, die einzelnen Radiatorglieder 5 stehen über ihre gesamte Längsseite mit dem Inneren des Gehäuses 3 direkt in Verbindung. Die Radiatorglieder 5 eine Seite bilden somit gleichsam einen Radiator 6, bei dem alle Radiatorglieder 5 parallel vom Kühlmittel durchströmt werden können. 3 shows a well-known corrugated iron tank for a transformer or a choke, on the housing 3 of which a multiplicity of plate-shaped radiator elements 5 are arranged on both longitudinal sides over the entire height of the housing 3 . This means that the individual radiator elements 5 are directly connected to the interior of the housing 3 over their entire longitudinal side. The radiator elements 5 on one side thus form a radiator 6, so to speak, in which all radiator elements 5 can be flowed through in parallel by the coolant.

Fig. 4 zeigt den Wellblechkessel aus Fig. 3 von oben. Hier ist beispielhaft eine Einrichtung zum Auflösen der Grenzschicht als Platte 14 zwischen zwei Radiatorgliedern 5 eingezeichnet. Zwischen den übrigen Radiatorgliedern 5 könnten ebenfalls solche Platten 14 angeordnet sein, und/oder andere Einrichtungen zum Auflösen der Grenzschicht. 4 shows the corrugated iron kettle 3 from above. A device for breaking up the boundary layer is shown here as an example as a plate 14 between two radiator elements 5 . Such plates 14 could also be arranged between the remaining radiator elements 5, and/or other devices for breaking up the boundary layer.

Bezugszeichenliste:Reference list:

11
Transformatortransformer
22
Transformatorwicklungtransformer winding
33
GehäuseHousing
44
Kühlmittelcoolant
55
Radiatorgliedradiator section
66
Radiatorradiator
77
Pumpepump
88th
Stab (Einrichtung zur Verwirbelung der zwischen den Radiatorgliedern 5 durchströmenden Luft)Rod (device for swirling the air flowing through between the radiator members 5)
99
Draht (Einrichtung zur Verwirbelung der zwischen den Radiatorgliedern 5 durchströmenden Luft)Wire (device for swirling the air flowing through between the radiator members 5)
1010
Kerncore
1111
Ausdehnungsgefäßexpansion tank
1212
Steigrohrriser
1313
Rückleitungsrohrreturn pipe
1414
Platteplate

Claims (5)

  1. Method for a radiator (6) or a choke, wherein the radiator (6) or the choke has a plurality of radiator elements (5) which are arranged parallel to one another and through which an air flow can flow in parallel, and, between two radiator elements (5), at least one device for resolving the boundary layer of the air flow flowing between the radiator elements (5) is provided, characterized in that the device for resolving the boundary layer is attached to a radiator (6) which is already in operation and which is connected to a transformer (1).
  2. Method according to Claim 1, characterized in that at least one bar (8) is clamped between two adjacent radiator elements (5).
  3. Method according to Claim 1 or 2, characterized in that at least one wire (9) is wound around one of the radiator elements (5).
  4. Method according to one of the preceding claims, characterized in that at least one plate (14) is mounted between two adjacent radiator elements (5).
  5. Method according to one of the preceding claims, characterized in that at least one radiator element (5) is provided with a coating for increasing the surface roughness.
EP20198629.6A 2019-10-25 2020-09-28 Radiator for cooling a transformer or a choke Active EP3812677B1 (en)

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Application Number Priority Date Filing Date Title
DE102019216469.2A DE102019216469A1 (en) 2019-10-25 2019-10-25 Radiator for cooling a transformer or a reactor

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EP3812677A1 EP3812677A1 (en) 2021-04-28
EP3812677B1 true EP3812677B1 (en) 2023-08-30

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1461518A (en) * 1921-03-14 1923-07-10 Westinghouse Electric & Mfg Co Transformer radiator
FR2717299B1 (en) * 1994-03-10 1996-05-10 France Transfo Sa Immersed electrical transformer tank heat exchanger.
DE102005002005B4 (en) * 2005-01-17 2007-02-08 Areva Energietechnik Gmbh Cooling device, in particular for an electrical transformer
BRMU8801397U2 (en) * 2008-05-13 2010-01-05 Eros Antonio expandable thermal radiator arrangement for oil-powered or similar electrical transformers
US20120312515A1 (en) * 2011-06-10 2012-12-13 Waukesha Electric Systems, Inc. Apparatus for heat dissipation of transforming radiators

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