EP1265045A2 - High refrigeration power evaporator for vehicle air conditioning system - Google Patents
High refrigeration power evaporator for vehicle air conditioning system Download PDFInfo
- Publication number
- EP1265045A2 EP1265045A2 EP02012050A EP02012050A EP1265045A2 EP 1265045 A2 EP1265045 A2 EP 1265045A2 EP 02012050 A EP02012050 A EP 02012050A EP 02012050 A EP02012050 A EP 02012050A EP 1265045 A2 EP1265045 A2 EP 1265045A2
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- European Patent Office
- Prior art keywords
- elementary
- path
- belonging
- heat exchanger
- collecting
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/0202—Header boxes having their inner space divided by partitions
- F28F9/0204—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions
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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
- 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
- F28D1/0325—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 the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another
- F28D1/0333—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 the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another the plates having integrated connecting members
- F28D1/0341—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 the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another the plates having integrated connecting members with U-flow or serpentine-flow inside the conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
- F28F9/262—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators
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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
- 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
- F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
- F28D2021/0085—Evaporators
Definitions
- the invention relates to a heat exchanger defining a combined path for a first fluid formed of a multiplicity first elementary journeys and a combined journey for a second fluid formed by a multiplicity of seconds elementary paths, the first and second paths elementary being arranged alternately in a first direction so that each elementary path for one fluids either in thermal contact with at least one path adjacent elementary for the other fluid, each first basic path with a U-shaped configuration, both of which branches extend in a second direction and are offset from each other in a third direction, the first, second and third directions being substantially perpendicular to each other, each second elementary path extending into the third direction of an entrance face of the exchanger, close to a first branch of the first elementary paths, at a exit face, close to the second branch of the first elementary paths, the two branches of each first elementary path leading into collecting spaces respective, the collecting spaces connected to said first branches and those connected to said second branches being aligned in the first direction in first and second rows respectively, and the collecting spaces communicating two by two so as to establish a combined route extending
- Such heat exchangers are used in particular as as evaporators in vehicle air conditioning loops, the first fluid being a circulating refrigerant in the loop, and the second fluid being air intended for the passenger compartment of the vehicle.
- evaporators in which the refrigerant circulates in a combined path in six passes, a first subset of first elementary paths defining a first pass starting from a first collector space belonging to the second row and a second pass leading to a second collecting space belonging to the first row, a second subset of first elementary paths defining a third pass starting from a third collector space, next to the second collecting space in the first row and communicating with this one, and a fourth pass leading to a fourth collector space next to the first collector space in the second row and separated from it by a partition, and a third subset of first elementary paths defining a fifth pass starting from a fifth collector space next to the fourth collector space in the second row and communicating with it and a sixth pass leading to a sixth collector space next to the third collector space in the first row and separated from it by a partition.
- the refrigerant flows from the second face to the first face of the evaporator, that is to say against the flow of air, while it flows from the first face to the second face, i.e. in the same direction as the air, between the third pass and the fourth pass.
- the object of the invention is in particular to improve the characteristics evaporator refrigerators, both in terms of cooling capacity in terms of homogeneity of the temperature of the cooled air of a second elementary path to the other.
- the invention relates in particular to a heat exchanger of the kind defined in the introduction, and provides that at least one passage of transition is made between two collecting spaces belonging respectively in the two rows, so that, in the first elementary journeys communicating directly with these two collecting spaces, the fluid circulates from one branch to another in the same direction compared to the third direction.
- Figure 1 is a top view in section of an evaporator according to the invention.
- Figure 2 is a graph showing performance respective refrigerators of an evaporator according to the invention and a conventional circuit evaporator.
- FIG. 1 represents an evaporator according to the invention, in section along the plane passing through the axes of the two rows collector spaces.
- This evaporator consists essentially of by a stack of pockets and dividers corrugated as described for example in FR 2 747 462 A, to which we can refer for more details on the structure of this stack.
- Each pocket 1 is formed of two stamped sheet metal plates in the form of bowls 2 and 3. These are identical to each other and have their concavities facing one another, that is to say respectively to the right and to the left of the figure.
- Each bowl has a peripheral edge 4 located in a perpendicular plane to that of the figure, and the peripheral edges 4 of the two bowls forming a pocket are mutually assembled in a fluid-tight manner, for example by soldering, to define the interior volume of the pouch.
- Each pocket has two head regions 5 and 6, located respectively down and up in the figure, defined by deep-drawn plates 2, 3. The lead regions 5 and 6 occupy a minority fraction of the height of the evaporator at the top of it, the rest of the height, behind the plane of the figure, being occupied by a thinner body region.
- regions 5 and 6 of each pocket are separated from each other by a zone of tight junction 7 between the two bowls at mid-width of the pocket, this junction zone extending downwards to the vicinity of the lower end of the pocket so as to define in the body region thereof a elementary U-shaped path for the refrigerant between these two volumes.
- a neighboring plate 2 and a neighboring plate 3 belonging with two different pockets are in mutual support by their funds 8 in regions 5 and 6, and separated one of the other, in the body region, by a trimmed interval a wavy interlayer defining an elementary path for the air to be cooled, parallel to the plane of the figure, according to arrow F1. Funds 8 in mutual contact are brazed together and some of them are crossed by openings 9 making the volumes communicate with each other corresponding interiors.
- the evaporator comprises an inlet insert of fluid 10 and a fluid outlet insert 11 which are stacked with pockets 1, each insert being interposed between regions 5 and 6 of a pocket on the one hand and the regions 5 and 6 of another pocket on the other hand.
- the inserts 10 and 11 are for example of the type described in FR 2 757 618 A. Inserts 10 and 11 are both identical and define each an inlet or outlet pipe 12 projecting relative to the inlet face 13 of the evaporator, that is to say the face through which the air flow F1 enters, and a interior volume divided by a partition 14 into a part 15 which communicates with the interior volumes of regions 5 of neighboring pockets and a part 16 which communicates with the interior volumes of regions 6 of these pockets.
- the refrigerant entering the evaporator through the inlet pipe 12 of the insert 10 is distributed, via of volume 15, between the interior volumes of regions 5 lying between one end 20 of the evaporator, located to the left of the figure, and a partition 17 formed by the bottoms of two bowls not provided with opening 9, these interior volumes forming a first collecting space 21.
- the fluid travels in parallel the elementary U-shaped paths delimited by the pockets that define it, the branches close to the face 13 and the branches close to the opposite face or face of outlet 18 forming respectively a first pass and a second pass, the latter leading to a second space collector 22 formed by the interior volumes of regions 6 of the same pockets which form the collecting space 21.
- the collector space 22 communicates through openings 9-1 with a third collector space 23, which is connected to its tower to a fourth collecting space 24, separated from the space 21 through partition 17, via elementary paths U-shaped forming a third pass and a fourth past.
- a transition insert 27 is interposed in the stack of sleeves, following the sleeves defining the collecting spaces 23 and 24.
- the insert 27 defines a unitary interior volume 28 extending over all the width of the evaporator, not communicating with the exterior thereof, separated from the space 23 by a wall 29 and communicating with space 24.
- volume 28 communicates with a collecting space 25 formed by the volumes interiors of regions 6 of the pockets to the right of insert 27 and up to the right end 30 of the evaporator, and is separated by a wall 31 of a collecting space 26 formed by the regions 5 of the same pockets.
- insert 27 passes the fluid from the fourth space collector 24, located in the row close to face 13, at fifth collector space 25, located in the next row from face 18, from where it arrives, via elementary U-shaped paths forming fifth and sixth passes, to the sixth collecting space 26, which communicates with the outlet pipe 12 via the volume 15 of the outlet insert 11.
- the refrigerant circulates twice in the opposite direction of the air according to the arrow F2, namely between the third and fourth passes and between the fifth and sixth passes, the traffic taking place in the same direction as air, according to arrow F1, only between the first two passes.
- This circuit improves the cooling capacity of the evaporator by compared to conventional circuitry in which the fluid refrigerant flows in the opposite direction of the air between the two first passes and between the last two passes, and in the same sense as this between the third and fourth passes.
- Figure 2 in which the solid line curve and dashed line curve represent the variation of the cooling capacity produced as a function of the air flow, respectively for a evaporator according to the invention and for an analogous evaporator with conventional circuitry.
- the total surface of the holes 32 is included between 3 and 10%, and preferably between 4 and 6%, of the surface of the openings 9 connecting two volumes together belonging to the same collecting space, or communicating between them two collecting spaces.
- the evaporator has been described above assuming that the head regions of the covers are located at the superior, it can also be oriented differently.
- the heat exchanger according to the invention may include more than one transition insert.
- the input insert and / or the output insert can be removed depending on the location of the tubes entry and exit.
- the number of passes may be different of six.
- the heat exchanger can exert another function as that of an air conditioning evaporator of vehicle, and can be produced using another technology than the stacked pockets.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
Description
L'invention concerne un échangeur de chaleur définissant un trajet combiné pour un premier fluide formé d'une multiplicité de premiers trajets élémentaires et un trajet combiné pour un second fluide formé d'une multiplicité de seconds trajets élémentaires, les premiers et seconds trajets élémentaires étant disposés en alternance dans une première direction de manière que chaque trajet élémentaire pour l'un des fluides soit en contact thermique avec au moins un trajet élémentaire adjacent pour l'autre fluide, chaque premier trajet élémentaire ayant une configuration en U dont les deux branches s'étendent dans une seconde direction et sont décalées l'une par rapport à l'autre dans une troisième direction, les première, seconde et troisième directions étant sensiblement perpendiculaires les unes aux autres, chaque second trajet élémentaire s'étendant dans la troisième direction d'une face d'entrée de l'échangeur, proche d'une première branche des premiers trajets élémentaires, à une face de sortie, proche de la seconde branche des premiers trajets élémentaires, les deux branches de chaque premier trajet élémentaire débouchant dans des espaces collecteurs respectifs, les espaces collecteurs reliés auxdites premières branches et ceux reliés auxdites secondes branches étant alignés dans la première direction en des première et seconde rangées respectivement, et les espaces collecteurs communiquant deux à deux de manière à établir un trajet combiné s'étendant d'un espace collecteur d'entrée à un espace collecteur de sortie situés respectivement à des extrémités opposées de l'échangeur dans la première direction.The invention relates to a heat exchanger defining a combined path for a first fluid formed of a multiplicity first elementary journeys and a combined journey for a second fluid formed by a multiplicity of seconds elementary paths, the first and second paths elementary being arranged alternately in a first direction so that each elementary path for one fluids either in thermal contact with at least one path adjacent elementary for the other fluid, each first basic path with a U-shaped configuration, both of which branches extend in a second direction and are offset from each other in a third direction, the first, second and third directions being substantially perpendicular to each other, each second elementary path extending into the third direction of an entrance face of the exchanger, close to a first branch of the first elementary paths, at a exit face, close to the second branch of the first elementary paths, the two branches of each first elementary path leading into collecting spaces respective, the collecting spaces connected to said first branches and those connected to said second branches being aligned in the first direction in first and second rows respectively, and the collecting spaces communicating two by two so as to establish a combined route extending from an input collecting space to a space outlet manifold located respectively at ends opposite of the exchanger in the first direction.
De tels échangeurs de chaleur sont utilisés notamment en tant qu'évaporateurs dans des boucles de climatisation de véhicules, le premier fluide étant un fluide réfrigérant circulant dans la boucle, et le second fluide étant de l'air destiné à l'habitacle du véhicule. Such heat exchangers are used in particular as as evaporators in vehicle air conditioning loops, the first fluid being a circulating refrigerant in the loop, and the second fluid being air intended for the passenger compartment of the vehicle.
On connaít en particulier des évaporateurs dans lesquels le fluide réfrigérant circule selon un trajet combiné en six passes, un premier sous-ensemble de premiers trajets élémentaires définissant une première passe partant d'un premier espace collecteur appartenant à la seconde rangée et une seconde passe aboutissant à un second espace collecteur appartenant à la première rangée, un second sous-ensemble de premiers trajets élémentaires définissant une troisième passe partant d'un troisième espace collecteur, voisin du second espace collecteur dans la première rangée et communiquant avec celui-ci, et une quatrième passe aboutissant à un quatrième espace collecteur voisin du premier espace collecteur dans la seconde rangée et séparé de celui-ci par une cloison, et un troisième sous-ensemble de premiers trajets élémentaires définissant une cinquième passe partant d'un cinquième espace collecteur voisin du quatrième espace collecteur dans la seconde rangée et communiquant avec celui-ci et une sixième passe aboutissant à un sixième espace collecteur voisin du troisième espace collecteur dans la première rangée et séparé de celui-ci par une cloison.We know in particular evaporators in which the refrigerant circulates in a combined path in six passes, a first subset of first elementary paths defining a first pass starting from a first collector space belonging to the second row and a second pass leading to a second collecting space belonging to the first row, a second subset of first elementary paths defining a third pass starting from a third collector space, next to the second collecting space in the first row and communicating with this one, and a fourth pass leading to a fourth collector space next to the first collector space in the second row and separated from it by a partition, and a third subset of first elementary paths defining a fifth pass starting from a fifth collector space next to the fourth collector space in the second row and communicating with it and a sixth pass leading to a sixth collector space next to the third collector space in the first row and separated from it by a partition.
Ainsi, de la première passe à la seconde passe, et de la cinquième passe à la sixième passe, le fluide réfrigérant circule de la seconde face vers la première face de l'évaporateur, c'est-à-dire à contre-courant de l'air, tandis qu'il circule de la première face vers la seconde face, c'est-à-dire dans le même sens que l'air, entre la troisième passe et la quatrième passe.So from the first pass to the second pass, and from the fifth pass to sixth pass, the refrigerant flows from the second face to the first face of the evaporator, that is to say against the flow of air, while it flows from the first face to the second face, i.e. in the same direction as the air, between the third pass and the fourth pass.
L'invention a notamment pour but d'améliorer les caractéristiques frigorifiques de l'évaporateur, tant en termes de puissance frigorifique qu'en termes d'homogénéité de la température de l'air refroidi d'un second trajet élémentaire à l'autre.The object of the invention is in particular to improve the characteristics evaporator refrigerators, both in terms of cooling capacity in terms of homogeneity of the temperature of the cooled air of a second elementary path to the other.
L'invention vise notamment un échangeur de chaleur du genre défini en introduction, et prévoit qu'au moins un passage de transition est ménagé entre deux espaces collecteurs appartenant respectivement aux deux rangées, de telle sorte que, dans les premiers trajets élémentaires communiquant directement avec ces deux espaces collecteurs, le fluide circule d'une branche à l'autre dans le même sens par rapport à la troisième direction.The invention relates in particular to a heat exchanger of the kind defined in the introduction, and provides that at least one passage of transition is made between two collecting spaces belonging respectively in the two rows, so that, in the first elementary journeys communicating directly with these two collecting spaces, the fluid circulates from one branch to another in the same direction compared to the third direction.
Des caractéristiques optionnelles de l'invention, complémentaires ou de substitution, sont énoncées ci-après:
- Dans les premiers trajets élémentaires communiquant directement avec lesdits deux espaces collecteurs, le fluide circule de la seconde branche à la première branche.
- Un seul passage de transition est ménagé qui mène du quatrième espace collecteur, appartenant à la première rangée, au cinquième espace collecteur, appartenant à la seconde rangée.
- L'échangeur de chaleur comprend une multiplicité de pochettes empilées dans la première direction, comportant chacune une région de corps délimitant l'un des premiers trajets élémentaires et deux régions de tête, de plus forte épaisseur que la région de corps, juxtaposées à celle-ci dans la seconde direction et juxtaposées entre elles dans la troisième direction, les régions de tête de deux pochettes voisines de l'empilement présentant des parois respectives appliquées les une contre les autres, tandis que leurs régions de corps délimitent entre elles un second trajet élémentaire, chaque espace collecteur étant formé par le volume intérieur d'une région de tête ou par les volumes intérieurs de régions de tête de plusieurs pochettes communiquant entre elles par des ouvertures ménagées dans lesdites parois, chaque passage de transition étant défini par un insert de transition interposé entre deux pochettes de l'empilement, communiquant d'une part avec le volume intérieur d'une région de tête de l'une de ces deux dernières pochettes, appartenant à la première rangée, d'autre part avec le volume intérieur d'une région de tête de l'autre pochette, appartenant à la seconde rangée.
- Il est prévu au moins un insert d'entrée ou de sortie pour le premier fluide, interposé entre deux pochettes de l'empilement, définissant une tubulure d'entrée ou de sortie en saillie sur l'une desdites faces d'entrée et de sortie de l'échangeur, qu'il fait communiquer avec les volumes intérieurs des régions de tête de ces deux dernières pochettes appartenant à l'une desdites rangées, et faisant communiquer entre eux les volumes intérieurs des régions de tête des mêmes pochettes appartenant à l'autre rangée.
- Des perforations sont ménagées dans au moins une cloison séparant entre eux deux espaces collecteurs voisins d'une même rangée, pour créer un chemin de fuite pour le premier fluide en dérivation du ou des premiers trajets élémentaires interposés entre ces deux espaces collecteurs.
- Lesdites perforations sont ménagées dans une paroi de l'insert de transition.
- Ledit chemin de fuite est créé entre les troisième et cinquième espaces collecteurs.
- La surface totale des perforations ménagées dans une cloison est comprise entre 3 et 10 %, et de préférence entre 4 et 6 %, de la section de passage entre deux espaces collecteurs communiquant directement entre eux.
- Lesdites perforations ont un diamètre compris entre 1 et 3 mm.
- In the first elementary paths communicating directly with said two collecting spaces, the fluid circulates from the second branch to the first branch.
- A single transition passage is provided which leads from the fourth collecting space, belonging to the first row, to the fifth collecting space, belonging to the second row.
- The heat exchanger comprises a multiplicity of pockets stacked in the first direction, each comprising a body region delimiting one of the first elementary paths and two head regions, thicker than the body region, juxtaposed therewith. ci in the second direction and juxtaposed with each other in the third direction, the head regions of two neighboring pockets of the stack having respective walls applied one against the other, while their body regions delimit between them a second elementary path , each collecting space being formed by the interior volume of a head region or by the interior volumes of head regions of several pockets communicating with one another through openings in said walls, each transition passage being defined by a transition insert interposed between two pockets of the stack, communicating on the one hand with the interior volume of a head region of one of these last two pockets, belonging to the first row, on the other hand with the interior volume of a head region of the other pocket, belonging to the second row .
- There is at least one inlet or outlet insert for the first fluid, interposed between two pockets of the stack, defining an inlet or outlet pipe projecting from one of said inlet and outlet faces. of the exchanger, which it communicates with the interior volumes of the head regions of these last two pockets belonging to one of said rows, and causing the interior volumes of the head regions of the same pockets belonging to the to communicate with each other other row.
- Perforations are provided in at least one partition separating between them two neighboring collecting spaces of the same row, to create a leakage path for the first fluid bypassing the first elementary path or paths interposed between these two collecting spaces.
- Said perforations are formed in a wall of the transition insert.
- Said escape route is created between the third and fifth collecting spaces.
- The total area of the perforations made in a partition is between 3 and 10%, and preferably between 4 and 6%, of the passage section between two collecting spaces communicating directly with each other.
- Said perforations have a diameter between 1 and 3 mm.
Les caractéristiques et avantages de l'invention seront exposés plus en détail dans la description ci-après, en se référant aux dessins annexés.The characteristics and advantages of the invention will be described in more detail in the description below, in referring to the attached drawings.
La figure 1 est une vue de dessus en coupe d'un évaporateur selon l'invention. Figure 1 is a top view in section of an evaporator according to the invention.
La figure 2 est un graphique montrant les performances frigorifiques respectives d'un évaporateur selon l'invention et d'un évaporateur à circuitage classique.Figure 2 is a graph showing performance respective refrigerators of an evaporator according to the invention and a conventional circuit evaporator.
La figure 1 représente un évaporateur selon l'invention, en
coupe selon le plan passant par les axes des deux rangées
d'espaces collecteurs. Cet évaporateur est constitué essentiellement
par un empilement de pochettes et d'intercalaires
ondulés tel que décrit par exemple dans FR 2 747 462 A,
auquel on pourra se reporter pour plus de détails sur la
structure de cet empilement. Chaque pochette 1 est formée de
deux plaques de tôle embouties en forme de cuvettes 2 et 3.
Ces dernières sont identiques entre elles et ont leurs
concavités tournées l'une vers l'autre, soit respectivement
vers la droite et vers la gauche de la figure. Chaque cuvette
présente un bord périphérique 4 situé dans un plan perpendiculaire
à celui de la figure, et les bords périphériques 4
des deux cuvettes formant une pochette sont mutuellement
assemblés de façon étanche au fluide, par exemple par
brasage, pour délimiter le volume intérieur de la pochette.
Chaque pochette présente deux régions de tête 5 et 6, situées
respectivement vers le bas et vers le haut de la figure,
définies par des emboutis profonds des plaques 2, 3. Les
régions de tête 5 et 6 occupent une fraction minoritaire de
la hauteur de l'évaporateur à la partie supérieure de celui-ci,
le reste de la hauteur, en arrière du plan de la figure,
étant occupé par une région de corps de plus faible épaisseur.
Les volumes intérieurs des régions 5 et 6 de chaque
pochette sont séparés l'un de l'autre par une zone de
jonction étanche 7 entre les deux cuvettes à mi-largeur de la
pochette, cette zone de jonction se prolongeant vers le bas
jusqu'au voisinage de l'extrémité inférieure de la pochette
de façon à définir dans la région de corps de celle-ci un
trajet élémentaire en U pour le fluide réfrigérant entre ces
deux volumes. Une plaque 2 et une plaque 3 voisines appartenant
à deux pochettes différentes sont en appui mutuel par
leurs fonds 8 dans les régions 5 et 6, et séparées l'une de
l'autre, dans la région de corps, par un intervalle garni
d'un intercalaire ondulé définissant un trajet élémentaire
pour l'air à refroidir, parallèlement au plan de la figure,
selon la flèche F1. Les fonds 8 en contact mutuel sont brasés
ensemble et certains d'entre eux sont traversés par des
ouvertures 9 faisant communiquer entre eux les volumes
intérieurs correspondants.FIG. 1 represents an evaporator according to the invention, in
section along the plane passing through the axes of the two rows
collector spaces. This evaporator consists essentially of
by a stack of pockets and dividers
corrugated as described for example in
De manière connue, l'évaporateur comprend un insert d'entrée
de fluide 10 et un insert de sortie de fluide 11 qui sont
empilés avec les pochettes 1, chaque insert étant interposé
entre les régions 5 et 6 d'une pochette d'une part et les
régions 5 et 6 d'une autre pochette d'autre part. Les inserts
10 et 11 sont par exemple du type décrit dans FR 2 757 618 A.
Les inserts 10 et 11 sont tous deux identiques et définissent
chacun une tubulure d'entrée ou de sortie 12 faisant saillie
par rapport à la face d'entrée 13 de l'évaporateur, c'est-à-dire
la face par laquelle pénètre le flux d'air F1, et un
volume intérieur divisé par une cloison 14 en une partie 15
qui communique avec les volumes intérieurs des régions 5 des
pochettes voisines et une partie 16 qui communique avec les
volumes intérieurs des régions 6 de ces pochettes.In known manner, the evaporator comprises an inlet insert
of
Le fluide réfrigérant pénétrant dans l'évaporateur par la
tubulure d'entrée 12 de l'insert 10 se répartit, par l'intermédiaire
du volume 15, entre les volumes intérieurs des
régions 5 compris entre une extrémité 20 de l'évaporateur,
située à gauche de la figure, et une cloison 17 formée par
les fonds de deux cuvettes non munis d'ouverture 9, ces
volumes intérieurs formant un premier espace collecteur 21.
A partir de l'espace collecteur 21, le fluide parcourt en
parallèle les trajets élémentaires en U délimités par les
pochettes qui le définissent, les branches proches de la face
13 et les branches proches de la face opposée ou face de
sortie 18 formant respectivement une première passe et une
seconde passe, cette dernière aboutissant à un second espace
collecteur 22 formé par les volumes intérieurs des régions 6
des mêmes pochettes qui forment l'espace collecteur 21.
L'espace collecteur 22 communique par des ouvertures 9-1 avec
un troisième espace collecteur 23, lequel est relié à son
tour à un quatrième espace collecteur 24, séparé de l'espace
21 par la cloison 17, par l'intermédiaire de trajets élémentaires
en U formant une troisième passe et une quatrième
passe.The refrigerant entering the evaporator through the
Selon l'invention, un insert de transition 27 est interposé
dans l'empilement de pochettes, à la suite des pochettes
définissant les espaces collecteurs 23 et 24. L'insert 27
définit un volume intérieur unitaire 28 s'étendant sur toute
la largeur de l'évaporateur, ne communiquant pas avec
l'extérieur de celui-ci, séparé de l'espace 23 par une paroi
29 et communiquant avec l'espace 24. De même, le volume 28
communique avec un espace collecteur 25 formé par les volumes
intérieurs des régions 6 des pochettes situées à droite de
l'insert 27 et jusqu'à l'extrémité droite 30 de l'évaporateur,
et est séparé par une paroi 31 d'un espace collecteur
26 formé par les régions 5 des mêmes pochettes. Ainsi,
l'insert 27 fait passer le fluide du quatrième espace
collecteur 24, situé dans la rangée proche de la face 13, au
cinquième espace collecteur 25, situé dans la rangée proche
de la face 18, d'où il parvient, par l'intermédiaire de
trajets élémentaires en U formant des cinquième et sixième
passes, au sixième espace collecteur 26, lequel communique
avec la tubulure de sortie 12 par l'intermédiaire du volume
15 de l'insert de sortie 11.According to the invention, a
Grâce à l'insert de transition 27, le fluide réfrigérant circule deux fois de suite en sens inverse de l'air selon la flèche F2, à savoir entre les troisième et quatrième passes et entre les cinquième et sixième passes, la circulation s'effectuant dans le même sens que l'air, selon la flèche F1, seulement entre les deux premières passes. Ce circuitage améliore la puissance frigorifique de l'évaporateur par rapport au circuitage classique dans lequel le fluide réfrigérant circule en sens inverse de l'air entre les deux premières passes et entre les deux dernières passes, et dans le même sens que celui-ci entre les troisième et quatrième passes. C'est ce que montre la figure 2, dans laquelle la courbe en trait plein et la courbe en trait interrompu représentent la variation de la puissance frigorifique produite en fonction du débit d'air, respectivement pour un évaporateur selon l'invention et pour un évaporateur analogue à circuitage classique.Thanks to the transition insert 27, the refrigerant circulates twice in the opposite direction of the air according to the arrow F2, namely between the third and fourth passes and between the fifth and sixth passes, the traffic taking place in the same direction as air, according to arrow F1, only between the first two passes. This circuit improves the cooling capacity of the evaporator by compared to conventional circuitry in which the fluid refrigerant flows in the opposite direction of the air between the two first passes and between the last two passes, and in the same sense as this between the third and fourth passes. This is shown in Figure 2, in which the solid line curve and dashed line curve represent the variation of the cooling capacity produced as a function of the air flow, respectively for a evaporator according to the invention and for an analogous evaporator with conventional circuitry.
On constate également une amélioration de l'homogénéité de la température de l'air refroidi d'une extrémité à l'autre de l'évaporateur.There is also an improvement in the homogeneity of the temperature of the air cooled from one end to the other of the evaporator.
Ces caractéristiques de fonctionnement peuvent encore être
améliorées en prévoyant dans la paroi 29 des trous 32 créant
un chemin de fuite entre les espaces collecteurs 23 et 25.
Avantageusement, la surface totale des trous 32 est comprise
entre 3 et 10 %, et de préférence entre 4 et 6 %, de la
surface des ouvertures 9 reliant entre eux deux volumes
appartenant à un même espace collecteur, ou faisant communiquer
entre eux deux espaces collecteurs.These operating characteristics can still be
improved by providing in the
Bien que l'évaporateur ait été décrit ci-dessus en supposant que les régions de tête des pochettes se situent à la partie supérieure, il peut également être orienté différemment.Although the evaporator has been described above assuming that the head regions of the covers are located at the superior, it can also be oriented differently.
L'invention n'est pas limitée au mode de réalisation décrit et représenté. En particulier, l'échangeur de chaleur selon l'invention peut comporter plus d'un insert de transition. L'insert d'entrée et/ou l'insert de sortie peuvent être supprimés en fonction de l'implantation des tubulures d'entrée et de sortie. Le nombre de passes peut être différent de six. L'échangeur de chaleur peut exercer une autre fonction que celle d'un évaporateur de climatisation de véhicule, et peut être réalisé selon une autre technologie que celle des pochettes empilées.The invention is not limited to the embodiment described to be present. In particular, the heat exchanger according to the invention may include more than one transition insert. The input insert and / or the output insert can be removed depending on the location of the tubes entry and exit. The number of passes may be different of six. The heat exchanger can exert another function as that of an air conditioning evaporator of vehicle, and can be produced using another technology than the stacked pockets.
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0107452 | 2001-06-07 | ||
FR0107452A FR2825791B1 (en) | 2001-06-07 | 2001-06-07 | HIGH REFRIGERATION POWER EVAPORATOR FOR VEHICLE AIR CONDITIONING LOOP |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1265045A2 true EP1265045A2 (en) | 2002-12-11 |
EP1265045A3 EP1265045A3 (en) | 2003-05-28 |
EP1265045B1 EP1265045B1 (en) | 2004-10-13 |
Family
ID=8864051
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02012050A Expired - Lifetime EP1265045B1 (en) | 2001-06-07 | 2002-05-31 | High refrigeration power evaporator for vehicle air conditioning system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1265045B1 (en) |
AT (1) | ATE279706T1 (en) |
DE (1) | DE60201554T2 (en) |
FR (1) | FR2825791B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004005826A1 (en) * | 2002-07-03 | 2004-01-15 | Behr Gmbh & Co. | Heat exchanger |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2929388B1 (en) | 2008-03-25 | 2015-04-17 | Valeo Systemes Thermiques | HEAT EXCHANGER WITH HIGH REFRIGERATED POWER |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5355947A (en) * | 1993-10-25 | 1994-10-18 | Chrysler Corporation | Heat exchanger having flow control insert |
GB2298038A (en) * | 1995-02-17 | 1996-08-21 | Gen Motors Corp | Heat exchanger and coupling member |
GB2351800A (en) * | 1999-06-29 | 2001-01-10 | Calsonic Kansei Corp | An evaporator |
-
2001
- 2001-06-07 FR FR0107452A patent/FR2825791B1/en not_active Expired - Lifetime
-
2002
- 2002-05-31 DE DE60201554T patent/DE60201554T2/en not_active Expired - Lifetime
- 2002-05-31 EP EP02012050A patent/EP1265045B1/en not_active Expired - Lifetime
- 2002-05-31 AT AT02012050T patent/ATE279706T1/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5355947A (en) * | 1993-10-25 | 1994-10-18 | Chrysler Corporation | Heat exchanger having flow control insert |
GB2298038A (en) * | 1995-02-17 | 1996-08-21 | Gen Motors Corp | Heat exchanger and coupling member |
GB2351800A (en) * | 1999-06-29 | 2001-01-10 | Calsonic Kansei Corp | An evaporator |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004005826A1 (en) * | 2002-07-03 | 2004-01-15 | Behr Gmbh & Co. | Heat exchanger |
US7650934B2 (en) | 2002-07-03 | 2010-01-26 | Behr Gmbh & Co. | Heat exchanger |
Also Published As
Publication number | Publication date |
---|---|
FR2825791A1 (en) | 2002-12-13 |
FR2825791B1 (en) | 2003-09-05 |
ATE279706T1 (en) | 2004-10-15 |
EP1265045B1 (en) | 2004-10-13 |
EP1265045A3 (en) | 2003-05-28 |
DE60201554T2 (en) | 2005-03-24 |
DE60201554D1 (en) | 2004-11-18 |
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