WO2017158293A1 - Gas cooler for motor vehicle - Google Patents

Gas cooler for motor vehicle Download PDF

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Publication number
WO2017158293A1
WO2017158293A1 PCT/FR2017/050594 FR2017050594W WO2017158293A1 WO 2017158293 A1 WO2017158293 A1 WO 2017158293A1 FR 2017050594 W FR2017050594 W FR 2017050594W WO 2017158293 A1 WO2017158293 A1 WO 2017158293A1
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WO
WIPO (PCT)
Prior art keywords
gas cooler
flat tubes
inclusive
spacers
refrigerant
Prior art date
Application number
PCT/FR2017/050594
Other languages
French (fr)
Inventor
Georges De Pelsemaeker
Dominik Sporna
Original Assignee
Valeo Systemes Thermiques
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valeo Systemes Thermiques filed Critical Valeo Systemes Thermiques
Publication of WO2017158293A1 publication Critical patent/WO2017158293A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • 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
    • F28F1/126—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 consisting of zig-zag shaped fins

Definitions

  • the invention relates to a heat exchanger, in particular for a motor vehicle, and more specifically to a gas cooler in which refrigerant fluid R744 is able to circulate.
  • Both heat exchangers and gas coolers generally comprise a plurality of flat tubes stacked and arranged parallel to each other, and spacers disposed between said flat tubes.
  • a refrigerant fluid in the gaseous state circulates in said flat tubes of the exchanger, and a second fluid, for example air, passes through said spacers arranged between said flat tubes.
  • the dimensions of the elements constituting a gas cooler are generally studied. for optimal efficiency and performance.
  • the tube pitch between two successive flat tubes being between 6.5 and 10 mm, terminals included.
  • the gas cooler because of its tube pitch between 6.5 and 10 mm, has a low environmental impact.
  • the tube pitch between two successive flat tubes is between 8 and 10 mm inclusive.
  • the tube pitch between two successive flat tubes is between 8 and 9 mm inclusive.
  • the tube pitch between two successive flat tubes is 8.60 mm, with a tolerance of plus or minus 0.05 mm.
  • the flat tubes have a width of between 10 and 17 mm inclusive.
  • the flat tubes have a thickness of between 1 and 1.25 mm inclusive.
  • the flat tubes have a light having a height of between 0.5 and 0.7 mm, including terminals.
  • the flat tubes have a flat tube wall thickness of between 0.15 and 0.4 mm inclusive.
  • the spacers have a thickness of between 0.06 and 0.10 mm, inclusive.
  • the spacers have a periodic profile with a period of between 1.90 and 2.4 mm inclusive.
  • the spacers have a height of between 7 and 10 mm inclusive.
  • the gas cooler comprises 2 or 3 passes of refrigerant.
  • FIG. 1 shows a diagrammatic representation in profile of a gas cooler
  • FIG. 2 shows a schematic representation in perspective of a part of a gas cooler
  • FIG. 3 is a diagrammatic representation in longitudinal section of FIG.
  • FIG. 4 shows a diagrammatic representation of a spacer
  • FIG. 5 shows a graph of the evolution of the environmental impact of the gas cooler as a function of the pitch of tubes
  • Figure 6 shows a graph of the evolution of the mass of the gas cooler and its efficiency as a function of the pitch of tubes.
  • FIG. 1 shows a schematic representation in profile of a gas cooler 1, in particular for use in an air conditioning circuit of a motor vehicle.
  • Said gas cooler 1 comprises a plurality of flat tubes 2 stacked and arranged parallel to each other. Inside these flat tubes 2 circulates a refrigerant fluid, more particularly R744, between two collectors 4 placed at the ends of said flat tubes 2. Between the flat tubes 2 are arranged tabs 3. Said tabs 3 have a periodic profile and are traversed by a second fluid, for example air.
  • the collectors 4 comprise an inlet 4a and / or the outlet 4b of refrigerant and also one or more separators 5 defining circulation zones.
  • each collector 4 comprises a separator 5 so that the refrigerant makes three passes within the gas cooler to pass from the inlet 4a to the outlet 4b of the refrigerant.
  • a single manifold 4 then has both an inlet 4a and a coolant outlet 4b separated by a separator 5.
  • the flat tubes 2 and the spacers 3 are generally made of metal materials, for example aluminum.
  • the chiller 1 is characterized according to various parameters illustrated in Figures 2 to 4.
  • the intervals described in this description are intervals whose terminals are included, that is to say that the terminals of said intervals are included in said intervals.
  • a tolerance quality related to the manufacturing process is to be considered for the various measures and intervals mentioned in this description.
  • the gas cooler 1 has a width lt (visible in Figure 2) of between 10 and 17 mm, in particular of the order of 12mm. This width lt is dictated in particular by the requirements of the car manufacturers and the VDA standards.
  • said flat tubes 2 have a height ht between 1 and 1.25 mm, preferably 1.1 mm.
  • the flat tubes 2 may furthermore have a hole 20 with a height h1 of between 0.5 and 0.7 mm, preferably 0.55 mm, with a tolerance of, for example, plus or minus 0.005 mm, and a thickness of wall and flat tube 2 between 0.15 and 0.4 mm.
  • the gas cooler 1 comprises twelve flat tubes.
  • the height ht of the flat tubes 2, the height hl of the light 20 of said flat tubes 2 and their number is an optimization between the manufacturing process, a limitation of the pressure drop of the refrigerant inside the tubes to 100kg / h, as well as the lowest possible pressure drop of the second fluid when it meets the side of said flat tubes 2.
  • the flat tubes 2 have a tube pitch pt (visible in FIG. 3) of between 8 and 10 mm, more particularly between 8 and 9 mm, in particular of the order of 8.60 mm, with a tolerance of, for example, more than or less 0.05mm.
  • the spacers 3 have a thickness ei of between 0.06 and 0.10 mm, preferably 0.07 mm, with a tolerance of, for example, plus or minus 0.005 mm.
  • Said spacers 3 also have a period p1 between 1.90 and 2.4 mm, preferably 2.1 mm, with a tolerance of 0.05 mm, for example.
  • the period pi and the thickness ei of the spacers 3 are in particular defined to limit the pressure drop of the second fluid as it passes through said spacers 3, while maintaining good protection of said interleaves against corrosion.
  • the spacers 3 also have a height hi of between 7 and 10 mm.
  • FIG. 5 shows a graph of the evolution of the environmental impact of a gas cooler 1 as a function of the tube pitch pt.
  • the environmental impact is expressed in gram of C02 per 100km and corresponds to the manufacture of said gas cooler 1, in particular the production of an ingot, the extrusion, brazing, its influence on the consumption of the motor vehicle during its duration of life and its recycling.
  • Figure 5 shows that, for a tube pitch of between 6.5 and 10 mm, the environmental impact is the lowest.
  • the environmental impact is even lower for an even smaller tube pitch pt between 8 and 9 mm with an optimum of 8.60 mm, with a tolerance of, for example, plus or minus 0.05 mm.
  • a tube pitch of between 8 and 10 mm allows to limit the increase in the mass of the gas cooler 1 while maintaining good efficiency.
  • This aspect is illustrated in Figure 6 showing the evolution of the efficiency and mass of a gas cooler 1 according to its pitch of pt tube. It is observed that the more the tube pitch pt decreases, the more the efficiency increases but also the mass of the gas cooler 1 increases. Indeed, in the context of the use of R744 as a refrigerant, it is not possible to reduce the thickness of the flat tubes 2 below a certain threshold because its pressure is high, of the order of 150 bars, when crossing the gas cooler 1. Thus, it is clear that the gas cooler 1 according to the invention not only allows good efficiency while having a limited mass and despite the use of R744 as a refrigerant and especially said gas cooler 1 has an impact low environmental impact.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention relates to a gas cooler (1) comprising: ◦ a plurality of parallel flat tubes (2) which are stacked on top of each other and inside which a refrigerant fluid can flow, R744 being the refrigerant fluid; ◦ inserts (3) which are placed between the flat tubes (2) and through which a second fluid can flow; the distance (pt) between two adjacent flat tubes (2), including the borders, ranges from 6.5 to 10 mm.

Description

Refroidisseur de gaz pour véhicule automobile.  Gas cooler for a motor vehicle.
L'invention concerne un échangeur de chaleur, en particulier pour véhicule automobile, et plus précisément un refroidisseur de gaz dans lequel du fluide réfrigérant R744 est apte à circuler. The invention relates to a heat exchanger, in particular for a motor vehicle, and more specifically to a gas cooler in which refrigerant fluid R744 is able to circulate.
Les échangeurs de chaleurs comme les refroidis seurs de gaz comportent généralement une multiplicité de tubes plats empilés et disposés parallèlement les uns des autres, et des intercalaires disposés entre lesdits tubes plats. Both heat exchangers and gas coolers generally comprise a plurality of flat tubes stacked and arranged parallel to each other, and spacers disposed between said flat tubes.
En fonctionnement, un fluide réfrigérant à l'état gazeux circule dans lesdits tubes plats de l'échangeur, et un deuxième fluide, par exemple de l'air, traverse lesdits intercalaires disposés entre lesdits tubes plats. In operation, a refrigerant fluid in the gaseous state circulates in said flat tubes of the exchanger, and a second fluid, for example air, passes through said spacers arranged between said flat tubes.
Les dimensions des éléments constituant un refroidisseur de gaz, comme par exemple le pas de tubes plats, l'épaisseur des tubes plats et des intercalaires, la période des intercalaires, ou encore la hauteur de la lumière au sein des tubes plats, sont généralement étudiées pour obtenir une efficacité et un rendement optimaux. The dimensions of the elements constituting a gas cooler, such as the pitch of flat tubes, the thickness of the flat tubes and spacers, the period of the spacers, or the height of the light within the flat tubes, are generally studied. for optimal efficiency and performance.
Cependant, ces refroidis seurs de gaz ne tiennent pas compte de leur impact environnemental à long terme. En effet, leur fabrication et le recyclage des matériaux les constituants sont consommateurs d'énergie et donc produisent du C02. De même leur utilisation au sein d'un véhicule automobile influe sur la consommation de se dernier et donc génère indirectement également du C02 par un surplus de consommation.. Un des buts de la présente invention est donc proposer un refroidisseur de gaz remédiant au moins partiellement aux inconvénients de l'art antérieur notamment en diminuant son impact environnemental. La présente invention concerne donc un refroidisseur de gaz comportant : However, these gas coolers do not take into account their long-term environmental impact. Indeed, their manufacture and recycling of materials constituents are energy consumers and therefore produce CO2. Similarly, their use in a motor vehicle influences the consumption of the latter and thus also indirectly generates C02 by a surplus of consumption. One of the aims of the present invention is therefore to provide a gas cooler at least partially overcoming the drawbacks of the prior art, in particular by reducing its environmental impact. The present invention therefore relates to a gas cooler comprising:
0 une multiplicité de tubes plats empilés et disposés parallèlement les uns des autres, et dans lesquels un fluide réfrigérant est apte à circuler, ledit fluide réfrigérant étant du R744, 0 a plurality of flat tubes stacked and arranged parallel to each other, and wherein a coolant is adapted to flow, said refrigerant being R744,
0 des intercalaires disposés entre lesdits tubes plats, lesdits intercalaires étant aptes à être traversés par un deuxième fluide, 0 spacers disposed between said flat tubes, said spacers being adapted to be traversed by a second fluid,
le pas de tube entre deux tubes plats successifs étant compris entre 6.5 et 10 mm, bornes incluses.  the tube pitch between two successive flat tubes being between 6.5 and 10 mm, terminals included.
Le refroidisseur de gaz, du fait de son pas de tube compris entre 6.5 et 10 mm, a un impact environnemental faible.  The gas cooler, because of its tube pitch between 6.5 and 10 mm, has a low environmental impact.
Selon un aspect de l'invention, le pas de tube entre deux tubes plats successifs est compris entre 8 et 10 mm, bornes incluses. According to one aspect of the invention, the tube pitch between two successive flat tubes is between 8 and 10 mm inclusive.
Selon un aspect de l'invention, le pas de tube entre deux tubes plats successifs est compris entre 8 et 9 mm, bornes incluses. According to one aspect of the invention, the tube pitch between two successive flat tubes is between 8 and 9 mm inclusive.
Selon un autre aspect de l'invention, le pas de tube entre deux tubes plats successifs est de 8,60 mm, avec une tolérance de plus ou moins 0,05 mm. Selon un autre aspect de l'invention, les tubes plats ont une largeur comprise entre 10 et 17 mm, bornes incluses. Selon un autre aspect de l'invention, les tubes plats ont une épaisseur comprise entre 1 et 1,25 mm, bornes incluses. According to another aspect of the invention, the tube pitch between two successive flat tubes is 8.60 mm, with a tolerance of plus or minus 0.05 mm. According to another aspect of the invention, the flat tubes have a width of between 10 and 17 mm inclusive. According to another aspect of the invention, the flat tubes have a thickness of between 1 and 1.25 mm inclusive.
Selon un autre aspect de l'invention, les tubes plats ont une lumière d'une hauteur comprise entre 0,5 et 0,7 mm, bornes incluses. According to another aspect of the invention, the flat tubes have a light having a height of between 0.5 and 0.7 mm, including terminals.
Selon un autre aspect de l'invention, les tubes plats ont une épaisseur de paroi de tube plat 2 comprise entre 0,15 et 0,4 mm, bornes incluses. Selon un autre aspect de l'invention, les intercalaires ont une épaisseur comprise entre 0,06 et 0,10 mm, bornes incluses. According to another aspect of the invention, the flat tubes have a flat tube wall thickness of between 0.15 and 0.4 mm inclusive. According to another aspect of the invention, the spacers have a thickness of between 0.06 and 0.10 mm, inclusive.
Selon un autre aspect de l'invention, les intercalaires ont un profil périodique de période comprise entre 1,90 et 2,4 mm, bornes incluses. According to another aspect of the invention, the spacers have a periodic profile with a period of between 1.90 and 2.4 mm inclusive.
Selon un autre aspect de l'invention, les intercalaires ont une hauteur comprise entre 7 et 10 mm, bornes incluses. According to another aspect of the invention, the spacers have a height of between 7 and 10 mm inclusive.
Selon un autre aspect de l'invention, le refroidis seur de gaz comporte 2 ou 3 passes de fluide réfrigérant. According to another aspect of the invention, the gas cooler comprises 2 or 3 passes of refrigerant.
D'autres caractéristiques et avantages de l'invention apparaîtront plus clairement à la lecture de la description suivante, donnée à titre d'exemple illustratif et non limitatif, et des dessins annexés parmi lesquels : Other features and advantages of the invention will emerge more clearly on reading the following description, given by way of illustrative and nonlimiting example, and the appended drawings among which:
- la figure 1 montre une représentation schématique en vue de profil d'un refroidisseur de gaz,  FIG. 1 shows a diagrammatic representation in profile of a gas cooler,
la figure 2 montre une représentation schématique en perspective d'une partie d'un refroidisseur de gaz, la figure 3 montre une représentation schématique en coupe longitudinale de la figure 2, FIG. 2 shows a schematic representation in perspective of a part of a gas cooler, FIG. 3 is a diagrammatic representation in longitudinal section of FIG.
la figure 4 montre une représentation schématique d'un intercalaire, la figure 5 montre un graphique de l'évolution de l'impact environnemental du refroidisseur de gaz en fonction du pas de tubes,  FIG. 4 shows a diagrammatic representation of a spacer, FIG. 5 shows a graph of the evolution of the environmental impact of the gas cooler as a function of the pitch of tubes,
la figure 6 montre un graphique de l'évolution de la masse du refroidisseur de gaz et de son efficacité en fonction du pas de tubes.  Figure 6 shows a graph of the evolution of the mass of the gas cooler and its efficiency as a function of the pitch of tubes.
Les éléments identiques sur les différentes figures, portent les mêmes références. The identical elements in the different figures bear the same references.
Les réalisations suivantes sont des exemples. Bien que la description se réfère à un ou plusieurs modes de réalisation, ceci ne signifie pas nécessairement que chaque référence concerne le même mode de réalisation, ou que les caractéristiques s'appliquent seulement à un seul mode de réalisation. De simples caractéristiques de différents modes de réalisation peuvent également être combinées pour fournir d'autres réalisations. The following achievements are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the features apply only to a single embodiment. Simple features of different embodiments may also be combined to provide other embodiments.
La figure 1 montre une représentation schématique en vue de profil d'un refroidisseur de gaz 1, notamment pour utilisation au sein d'un circuit de climatisation d'un véhicule automobile. Ledit refroidisseur de gaz 1 comporte une multiplicité de tubes plats 2 empilés et disposés parallèlement les uns des autres. A l'intérieur de ces tubes plats 2 circule un fluide réfrigérant, plus particulièrement du R744, entre deux collecteurs 4 placés aux extrémités desdits tubes plats 2. Entre les tubes plats 2 sont disposés des intercalaires 3. Lesdits intercalaires 3 ont un profil périodique et sont traversés par un deuxième fluide, par exemple de l'air. Les collecteurs 4 comportent une entrée 4a et/ou la sortie 4b de fluide réfrigérant et également des un ou plusieurs séparateurs 5 définissant des zones de circulation. Dans l'exemple présenté à la figure 1, chaque collecteur 4 comporte un séparateur 5 de sorte que le fluide réfrigérant effectue trois passes au sein du refroidisseur de gaz pour passer de l'entrée 4a à la sortie 4b de fluide réfrigérant. Il est cependant tout à fait possible d'imaginer un mode de réalisation alternatif où le fluide réfrigérant n'effectue que deux passes, un seul collecteur 4 comporte alors à la fois une entrée 4a et une sortie 4b de fluide réfrigérant séparées par un séparateur 5. Les tubes plats 2 et les intercalaires 3 sont généralement réalisés en matériaux métalliques, par exemple en aluminium. Figure 1 shows a schematic representation in profile of a gas cooler 1, in particular for use in an air conditioning circuit of a motor vehicle. Said gas cooler 1 comprises a plurality of flat tubes 2 stacked and arranged parallel to each other. Inside these flat tubes 2 circulates a refrigerant fluid, more particularly R744, between two collectors 4 placed at the ends of said flat tubes 2. Between the flat tubes 2 are arranged tabs 3. Said tabs 3 have a periodic profile and are traversed by a second fluid, for example air. The collectors 4 comprise an inlet 4a and / or the outlet 4b of refrigerant and also one or more separators 5 defining circulation zones. In the example shown in FIG. 1, each collector 4 comprises a separator 5 so that the refrigerant makes three passes within the gas cooler to pass from the inlet 4a to the outlet 4b of the refrigerant. However, it is entirely possible to imagine an alternative embodiment where the coolant only performs two passes, a single manifold 4 then has both an inlet 4a and a coolant outlet 4b separated by a separator 5. The flat tubes 2 and the spacers 3 are generally made of metal materials, for example aluminum.
Le refroidisseur 1 se caractérise selon différents paramètres illustrés aux figures 2 à 4. Les intervalles décrit dans la présente description sont des intervalles dont les bornes sont incluses, c'est à dire que les bornes desdits intervalles sont comprises dans lesdits intervalles. De plus, une qualité de tolérance liée aux processus de fabrication est à prendre en considération pour les différentes mesures et intervalles mentionnés dans la présente description. The chiller 1 is characterized according to various parameters illustrated in Figures 2 to 4. The intervals described in this description are intervals whose terminals are included, that is to say that the terminals of said intervals are included in said intervals. In addition, a tolerance quality related to the manufacturing process is to be considered for the various measures and intervals mentioned in this description.
Le refroidisseur de gaz 1 a une largeur lt (visible sur la figure 2) comprise entre 10 et 17 mm, notamment de l'ordre de 12mm. Cette largeur lt est notamment dictée par les exigences des constructeurs automobiles et les normes VDA.  The gas cooler 1 has a width lt (visible in Figure 2) of between 10 and 17 mm, in particular of the order of 12mm. This width lt is dictated in particular by the requirements of the car manufacturers and the VDA standards.
Comme illustré à la figure 3, lesdits tubes plats 2 ont une hauteur ht comprise entre 1 et 1,25 mm, de préférence 1,1 mm. Les tubes plats 2 peuvent en outre avoir une lumière 20 d'une hauteur hl comprise entre 0,5 et 0,7 mm, de préférence 0,55 mm, avec une tolérance par exemple de plus ou moins 0,005mm, et une épaisseur de paroi Et de tube plat 2 comprise entre 0,15 et 0,4 mm. Dans l'exemple illustré à la figure 1, le refroidisseur de gaz 1 comporte douze tubes plats. La hauteur ht des tubes plats 2, la hauteur hl de la lumière 20 desdits tubes plats 2 ainsi que leur nombre est une optimisation entre le processus de fabrication, une limitation de la perte de charge du fluide réfrigérant à l'intérieur des tubes à 100kg/h, ainsi qu'une perte de charge la plus faible possible du deuxième fluide lorsqu'il rencontre le flanc desdits tubes plats 2.  As illustrated in Figure 3, said flat tubes 2 have a height ht between 1 and 1.25 mm, preferably 1.1 mm. The flat tubes 2 may furthermore have a hole 20 with a height h1 of between 0.5 and 0.7 mm, preferably 0.55 mm, with a tolerance of, for example, plus or minus 0.005 mm, and a thickness of wall and flat tube 2 between 0.15 and 0.4 mm. In the example illustrated in FIG. 1, the gas cooler 1 comprises twelve flat tubes. The height ht of the flat tubes 2, the height hl of the light 20 of said flat tubes 2 and their number is an optimization between the manufacturing process, a limitation of the pressure drop of the refrigerant inside the tubes to 100kg / h, as well as the lowest possible pressure drop of the second fluid when it meets the side of said flat tubes 2.
Les tubes plats 2 ont un pas de tube pt (visible sur la figure 3) compris entre 8 et 10 mm, plus particulièrement entre 8 et 9 mm, notamment de l'ordre de 8,60 mm, avec une tolérance par exemple de plus ou moins 0,05mm. Comme illustré sur la figure 4, les intercalaires 3 ont une épaisseur ei comprise entre 0,06 et 0,10 mm, de préférence 0,07 mm, avec une tolérance par exemple de plus ou moins 0,005mm. Lesdits intercalaires 3 ont également une période pi comprise entre 1,90 et 2,4 mm, de préférence 2,1 mm, avec une tolérance par exemple de 0,05mm. La période pi et l'épaisseur ei des intercalaires 3 sont notamment définies pour limiter les pertes de charges du deuxième fluide lorsqu'il traverse lesdits intercalaires 3, tout en conservant une bonne protection desdits intercalaires contre la corrosion. Les intercalaires 3 ont également une hauteur hi comprise entre 7 et 10 mm. Le refroidisseur de gaz 1, notamment du fait de son pas de tube pt compris entreThe flat tubes 2 have a tube pitch pt (visible in FIG. 3) of between 8 and 10 mm, more particularly between 8 and 9 mm, in particular of the order of 8.60 mm, with a tolerance of, for example, more than or less 0.05mm. As illustrated in FIG. 4, the spacers 3 have a thickness ei of between 0.06 and 0.10 mm, preferably 0.07 mm, with a tolerance of, for example, plus or minus 0.005 mm. Said spacers 3 also have a period p1 between 1.90 and 2.4 mm, preferably 2.1 mm, with a tolerance of 0.05 mm, for example. The period pi and the thickness ei of the spacers 3 are in particular defined to limit the pressure drop of the second fluid as it passes through said spacers 3, while maintaining good protection of said interleaves against corrosion. The spacers 3 also have a height hi of between 7 and 10 mm. The gas cooler 1, especially because of its tube pitch pt between
8 et 10 mm, a un impact environnemental faible. Cet impact environnemental est illustré à la figure 5 qui montre un graphique de l'évolution de impact environnemental d'un refroidisseur de gaz 1 en fonction du pas de tube pt. L'impact environnemental est exprimé en gramme de C02 par 100km et correspond à la fabrication dudit refroidisseur de gaz 1, en particulier la production d'un lingot, l'extrusion, le brasage, son influence sur la consommation du véhicule automobile durant sa durée de vie et son recyclage. La figure 5 montre alors que, pour un pas de tube pt compris entre 6.5 et 10 mm, l'impact environnemental est le plus faible. L'impact environnemental est encore plus faible pour un pas de tube pt encore plus restreint entre 8 et 9 mm avec un optimum de 8,60 mm, avec une tolérance par exemple de plus ou moins 0,05mm. 8 and 10 mm, has a low environmental impact. This environmental impact is illustrated in FIG. 5 which shows a graph of the evolution of the environmental impact of a gas cooler 1 as a function of the tube pitch pt. The environmental impact is expressed in gram of C02 per 100km and corresponds to the manufacture of said gas cooler 1, in particular the production of an ingot, the extrusion, brazing, its influence on the consumption of the motor vehicle during its duration of life and its recycling. Figure 5 shows that, for a tube pitch of between 6.5 and 10 mm, the environmental impact is the lowest. The environmental impact is even lower for an even smaller tube pitch pt between 8 and 9 mm with an optimum of 8.60 mm, with a tolerance of, for example, plus or minus 0.05 mm.
Un pas de tube pt compris entre 8 et 10 mm permet de limiter l'augmentation de la masse du refroidisseur de gaz 1 tout en conservant une bonne efficacité. Cet aspect est illustré à la figure 6 montrant l'évolution de l'efficacité et de la masse d'un refroidisseur de gaz 1 en fonction de son pas de tube pt. On observe alors que plus le pas de tube pt diminue, plus l'efficacité augmente mais également que la masse du refroidisseur de gaz 1 augmente. En effet, dans le cadre de l'utilisation du R744 comme fluide réfrigérant, il n'est pas possible de réduire l'épaisseur des tubes plats 2 en dessous d'un certain seuil car sa pression est élevée, de l'ordre de 150 bars, lors de la traversée du refroidisseur de gaz 1. Ainsi, on voit bien que le refroidis seur de gaz 1 selon l'invention permet non seulement une bonne efficacité tout en ayant une masse limitée et ce malgré l'utilisation de R744 comme fluide réfrigérant et surtout ledit refroidis seur de gaz 1 a un impact environnemental faible. A tube pitch of between 8 and 10 mm allows to limit the increase in the mass of the gas cooler 1 while maintaining good efficiency. This aspect is illustrated in Figure 6 showing the evolution of the efficiency and mass of a gas cooler 1 according to its pitch of pt tube. It is observed that the more the tube pitch pt decreases, the more the efficiency increases but also the mass of the gas cooler 1 increases. Indeed, in the context of the use of R744 as a refrigerant, it is not possible to reduce the thickness of the flat tubes 2 below a certain threshold because its pressure is high, of the order of 150 bars, when crossing the gas cooler 1. Thus, it is clear that the gas cooler 1 according to the invention not only allows good efficiency while having a limited mass and despite the use of R744 as a refrigerant and especially said gas cooler 1 has an impact low environmental impact.

Claims

REVENDICATIONS Refroidisseur de gaz (1) comportant : CLAIMS Gas cooler (1) comprising:
0 une multiplicité de tubes plats (2) empilés et disposés parallèlement les uns des autres, et dans lesquels un fluide réfrigérant est apte à circuler, ledit fluide réfrigérant étant du R744, 0 a plurality of flat tubes (2) stacked and arranged parallel to each other, and wherein a coolant is adapted to flow, said refrigerant being R744,
0 des intercalaires (3) disposés entre lesdits tubes plats (2), lesdits intercalaires (3) étant aptes à être traversés par un deuxième fluide, 0 spacers (3) disposed between said flat tubes (2), said spacers (3) being adapted to be traversed by a second fluid,
caractérisé en ce que le pas de tube (pt) entre deux tubes plats (2) successifs est compris entre 6.5 et 10 mm, bornes incluses. characterized in that the tube pitch (pt) between two successive flat tubes (2) is between 6.5 and 10 mm inclusive.
Refroidisseur de gaz (1) selon la revendication précédente, caractérisé en ce que le pas de tube (pt) entre deux tubes plats (2) successif est compris entre 8 et 10 mm, bornes incluses. Gas cooler (1) according to the preceding claim, characterized in that the tube pitch (pt) between two successive flat tubes (2) is between 8 and 10 mm inclusive.
Refroidisseur de gaz (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le pas de tube (pt) entre deux tubes plats (2) successifs est compris entre 8 et 9 mm, bornes incluses. Gas cooler (1) according to any one of the preceding claims, characterized in that the tube pitch (pt) between two successive flat tubes (2) is between 8 and 9 mm inclusive.
Refroidisseur de gaz (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le pas de tube (pt) entre deux tubes plats (2) successifs est de 8,60 mm, avec une tolérance de plus ou moins 0,05 mm. Gas cooler (1) according to any one of the preceding claims, characterized in that the tube pitch (pt) between two successive flat tubes (2) is 8.60 mm, with a tolerance of plus or minus 0, 05 mm.
Refroidisseur de gaz (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que les tubes plats (2) ont une largeur (lt) comprise entre 10 et 17 mm, bornes incluses. Refroidisseur de gaz (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que les tubes plats (2) ont une épaisseur (ht) comprise entre 1 et 1,25 mm, bornes incluses. Gas cooler (1) according to any one of the preceding claims, characterized in that the flat tubes (2) have a width (lt) of between 10 and 17 mm inclusive. Gas cooler (1) according to any one of the preceding claims, characterized in that the flat tubes (2) have a thickness (ht) of between 1 and 1.25 mm inclusive.
Refroidisseur de gaz (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que les tubes plats (2) ont une lumière (20) d'une hauteur (hl) comprise entre 0,5 et 0,7 mm, bornes incluses. Gas cooler (1) according to any one of the preceding claims, characterized in that the flat tubes (2) have a lumen (20) with a height (hl) of between 0.5 and 0.7 mm, terminals included.
Refroidisseur de gaz (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que les tubes plats (2) ont une épaisseur de paroi (Et) de tube plat 2 comprise entre 0,15 et 0,4 mm, bornes incluses. Gas cooler (1) according to any one of the preceding claims, characterized in that the flat tubes (2) have a wall thickness (Et) of flat tube 2 of between 0.15 and 0.4 mm inclusive. .
Refroidisseur de gaz (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que les intercalaires (3) ont une épaisseur (ei) comprise entre 0,06 et 0,10 mm, bornes incluses. Gas cooler (1) according to any one of the preceding claims, characterized in that the spacers (3) have a thickness (ei) of between 0.06 and 0.10 mm, inclusive.
10. Refroidisseur de gaz (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que les intercalaires (3) ont un profil périodique de période (pi) comprise entre 1,90 et 2,4 mm, bornes incluses. 10. Gas cooler (1) according to any one of the preceding claims, characterized in that the spacers (3) have a periodic profile period (pi) between 1.90 and 2.4 mm inclusive.
11. Refroidisseur de gaz (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que les intercalaires (3) ont une hauteur (hi) comprise entre 7 et 10 mm, bornes incluses. 11. Gas cooler (1) according to any one of the preceding claims, characterized in that the spacers (3) have a height (hi) of between 7 and 10 mm inclusive.
12. Refroidisseur de gaz (1) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte 2 ou 3 passes de fluide réfrigérant. 12. Gas cooler (1) according to any one of the preceding claims, characterized in that it comprises 2 or 3 passes of refrigerant.
PCT/FR2017/050594 2016-03-18 2017-03-15 Gas cooler for motor vehicle WO2017158293A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1652309 2016-03-18
FR1652309A FR3049047B1 (en) 2016-03-18 2016-03-18 GAS COOLER FOR MOTOR VEHICLE.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112013695A (en) * 2020-06-10 2020-12-01 湖北雷迪特冷却系统股份有限公司 Core body assembly with non-uniform wave pitch structure

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Publication number Priority date Publication date Assignee Title
FR2803376A1 (en) * 1999-12-29 2001-07-06 Valeo Climatisation STACKED FLAT TUBE EVAPORATOR WITH TWO OPPOSED FLUID BOXES
US20050189096A1 (en) * 2004-02-26 2005-09-01 Wilson Michael J. Compact radiator for an electronic device
DE102004056557A1 (en) * 2004-11-23 2006-05-24 Behr Gmbh & Co. Kg Dimensionally optimized heat exchange device and method for optimizing the dimensions of heat exchange devices
WO2006105823A1 (en) * 2005-04-08 2006-10-12 Behr Gmbh & Co. Kg Multiple-channel flat tube
US20080041559A1 (en) * 2006-08-16 2008-02-21 Halla Climate Control Corp. Heat exchanger for vehicle

Patent Citations (5)

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Publication number Priority date Publication date Assignee Title
FR2803376A1 (en) * 1999-12-29 2001-07-06 Valeo Climatisation STACKED FLAT TUBE EVAPORATOR WITH TWO OPPOSED FLUID BOXES
US20050189096A1 (en) * 2004-02-26 2005-09-01 Wilson Michael J. Compact radiator for an electronic device
DE102004056557A1 (en) * 2004-11-23 2006-05-24 Behr Gmbh & Co. Kg Dimensionally optimized heat exchange device and method for optimizing the dimensions of heat exchange devices
WO2006105823A1 (en) * 2005-04-08 2006-10-12 Behr Gmbh & Co. Kg Multiple-channel flat tube
US20080041559A1 (en) * 2006-08-16 2008-02-21 Halla Climate Control Corp. Heat exchanger for vehicle

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112013695A (en) * 2020-06-10 2020-12-01 湖北雷迪特冷却系统股份有限公司 Core body assembly with non-uniform wave pitch structure

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FR3049047B1 (en) 2019-11-01

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