HEAT EXCHANGER COMPRISING A PLURALITY OF FLUID CIRCULATION PLATES EACH COMPRISING AT LEAST TWO DISTINCT PORTIONS, COOLING SYSTEM AND METHOD OF MANUFACTURING

Abstract

HEAT EXCHANGER COMPRISING A PLURALITY OF FLUID CIRCULATION PLATES EACH COMPRISING AT LEAST TWO DISTINCT PORTIONS, COOLING SYSTEM AND MANUFACTURING METHOD The invention relates to a heat exchanger comprising a plurality of plates (14) for circulating said first fluid comprising: a plurality of conduits (18) configured to allow the circulation of said first fluid between a first inlet (35) and a first outlet (36), at least a first portion (15, 17) extending mainly along a plane having a non-zero inclination (25) relative to a main plane along which a second portion (16) extends, and in that said plates (14) for circulating said first fluid are configured such that said first portion (15, 17) and said second portion (16) of a first circulation plate (14) are respectively arranged substantially parallel to said first portion (15,17) and to said second portion (16) of a second circulation plate (14), each space between two circulation plates (14) defining a circulation layer of a second fluid. Figure for the abstract: figure 2,

Description

Title of the invention: HEAT EXCHANGER COMPRISING A PLURALITY OF FLUID CIRCULATION PLATES EACH COMPRISING AT LEAST TWO DISTINCT PORTIONS, COOLING SYSTEM AND METHOD OF MANUFACTURING Technical field of the invention

[0001] The invention relates to a heat exchanger suitable for use in a system air cooling, for example in an air, rail or land vehicle. In particular, the invention relates to a heat exchanger comprising a plurality of plates for circulating a first fluid. Technological background

[0002] Heat exchangers are used to enable heat transfer between at least two fluids, in particular to cool or heat one of the fluids using another fluid. Heat exchangers are used in many contexts, and in particular in air cooling systems for air, rail or land vehicles. Air cooling systems can be used to cool a flow of fluid (called hot fluid) in the liquid or gaseous state.

[0003] In the case of cooling, the cold flow of a cold circuit can, for example, be supplied by an air flow taken from the secondary flow of an aircraft engine, known as fan air, the temperature of which is close to the external environment of the aircraft. The cold circuit can also be supplied by an air flow taken from a scoop of the aircraft which supplies an air channel, better known as RAM air.

[0004] In aircraft, it is generally sought to limit the mass and bulk of all components. Thus, in certain cases, it may be useful to install heat exchangers within spaces spatially constrained by a generally curved shape, which is particularly the case for aircraft nacelles.

[0005] For example, EP3364142 discloses a curved heat exchanger formed of several segments assembled together by means of their closing bars, the ends of which extend along planes that are not parallel to each other.

[0006] However, such a heat exchanger has non-optimal heat exchange performance and relatively high pressure losses and causes constraints during manufacturing. Objectives of the invention

[0007] The invention aims to provide a heat exchanger making it possible to overcome these drawbacks.

[0008] The invention also aims to provide a heat exchanger having excellent efficiency while having a limited mass.

[0009] The invention also aims to provide, in at least one embodiment, a heat exchanger configured to be able to be installed in a spatially constrained space of an air, rail or land vehicle.

[0010] The invention also aims to provide, in at least one embodiment, a method of manufacturing such a heat exchanger, the implementation of which is easy and requires only a few separate elements. Statement of the invention

[0011] To this end, the invention relates to a heat exchanger comprising:

[0012] - a circulation enclosure comprising a first inlet for a first fluid in the circulation enclosure and a first outlet of said first fluid outside the circulation enclosure,

[0013] - a second inlet of a second fluid into the circulation enclosure and a second outlet of said second fluid outside the circulation enclosure,

[0014] characterized in that said exchanger comprises a plurality of circulation plates for said first fluid, each circulation plate for said first fluid comprising:

[0015] - a plurality of conduits configured to allow the circulation of said first fluid between said first inlet and said first outlet,

[0016] - at least a first portion and at least a second portion, said first portion extending mainly along a plane having a non-zero inclination relative to a principal plane along which said second portion extends,

[0017] and in that said circulation plates for said first fluid are configured such that said first portion of a first circulation plate is arranged substantially parallel to said first portion of a second circulation plate and such that said second portion of a first circulation plate is arranged substantially parallel to said second portion of said second circulation plate, each space between two circulation plates defining a circulation layer for said second fluid.

[0018] Thus, an exchanger according to the invention comprising such circulation plates integrating at least two portions inclined relative to each other as if each plate had been partially folded, can have a generally curved or bent general shape so as to be able to follow the curvature of a space allocated to the exchanger within a nacelle of an aircraft for example or any other space constrained having a non-planar (or substantially parallelepiped) shape. A heat exchanger according to the invention comprising such circulation plates thus also makes it possible to propose such a single-piece heat exchanger, i.e. formed from a single piece, and not from several sections assembled together with a distinct inclination. The structure of an exchanger according to the invention also allows the length of the passage within which said first fluid circulates within each circulation plate to be substantially identical within each circulation plate of said first fluid of the same heat exchanger, identical plates being able to be used for all the different layers of the same heat exchanger and not requiring any particular adaptation linked to the inclination of the different portions of a circulation plate of said first fluid relative to each other.The configuration of the circulation plates incorporating circulation ducts for the first fluid also makes it possible to provide circulation layers for the second fluid that are substantially identical to each other. This also improves the cooling performance of the heat exchanger and limits pressure losses.

[0019] The circulation plates of said first fluid are therefore arranged without being in contact with each other, two plates adjacent to each other providing a free space allowing the passage of said second fluid. The circulation plates of said first fluid are therefore arranged so as to allow an alternation of circulation layers of said first fluid and circulation layers of said second fluid. We also speak of alternation of so-called "hot" layers and so-called "cold" layers.

[0020] Each conduit of said first fluid circulation plates at least partially delimits a circulation channel for said first fluid within such a circulation plate. Each conduit of a first fluid circulation plate extends within each portion of said first fluid circulation plate. Thus, advantageously and according to the invention, each conduit of a first fluid circulation plate extends at least within said first portion and at least within said second portion of said first fluid circulation plate.Advantageously and according to the invention, each first fluid circulation plate comprises a plurality of conduits configured to allow the circulation of said first fluid between said first inlet and said first outlet, said conduits extending substantially parallel to each other within said first portion and within said second portion of said first fluid circulation plate. Thus, advantageously and according to the invention, within each portion of said first fluid circulation plates, said conduits extend substantially parallel to each other. Furthermore, each conduit of a first fluid circulation plate may have a . section of various geometric shapes, including a square section, a circular section or even a rectangular section.

[0021] Advantageously and according to the invention, each circulation plate for said first fluid is formed from a single piece, that is to say from a single piece integrating said conduits.

[0022] Advantageously and according to the invention, each circulation plate for said first fluid further comprises a third portion. Advantageously and according to the invention, each circulation plate further comprises a third portion, said third portion extending mainly along a plane having a non-zero inclination relative to a main plane along which said second portion extends, said second portion connecting said first portion and said third portion.

[0023] Advantageously and according to the invention, said inclination is at least equal to 10°. Advantageously and according to the invention, said inclination is between 15° and 50°.

[0024] Thus, advantageously and according to the invention, said heat exchanger further comprises closing bars for each circulation layer of said second fluid, at least one closing bar being arranged between two circulation plates of the first fluid.

[0025] Advantageously and according to the invention, at least one closing bar is arranged between said first portion of said first circulation plate and said first portion of said second circulation plate.

[0026] Advantageously and according to the invention, the closing bars in contact with at least a first portion of the circulation plates of said exchanger are offset relative to each other in a direction parallel to the main plane along which a first portion of a circulation plate of the first fluid extends.

[0027] Advantageously and according to the invention, each circulation plate of said first fluid of a heat exchanger according to the invention is adapted to allow the passage of a fluid in the liquid state or in the gaseous state.

[0028] Advantageously and according to the invention, each circulation layer of said second fluid of a heat exchanger according to the invention is adapted to allow the passage of a fluid in the gaseous state.

[0029] The first fluid may for example designate a fluid to be cooled (“hot” air) and the second fluid may designate a fluid having a temperature lower than that of the first fluid (so-called “cold” or “fresh” air) (case of a cooler in which the temperature of the first fluid is higher than the temperature of the second fluid). The reverse is of course also possible, for example in the case of operation as an evaporator in which the first fluid would designate a liquid to be evaporated by heat exchange with a second fluid whose temperature would be higher than the temperature of the first fluid.

[0030] Furthermore, flow guides (or fins) may be arranged in each circulation layer of said second fluid. Advantageously and according to the invention, each circulation layer of said second fluid comprises at least one flow guide having a corrugated shape. Such a flow guide may take various forms and may be in the form, for example, of a corrugated sheet, a corrugated strip or even zigzag fins. Advantageously and according to the invention, each flow guide of a circulation layer of said second fluid is arranged in contact with at least one circulation plate of said first fluid.

[0031] The circulation of each of said first and second fluids can take different forms, including those known as cross-flow or counter-flow (single or multiple passes). A heat exchanger according to the invention can be configured to allow a single-pass or U-shaped circuit of said first fluid. The second fluid of a heat exchanger according to the invention can be configured according to a single-pass, U-shaped, Z-shaped or any more complex circuit.

[0032] Advantageously and according to the invention, the conduits of each circulation plate of said first fluid are configured to allow the circulation of said first fluid between said first inlet and said first outlet in a direction substantially orthogonal to a main direction of circulation of said second fluid in each circulation layer of said second fluid. According to this aspect of the invention, the heat exchangers thus formed are cross-pass.

[0033] Nothing also prevents the provision of the conduits being configured to allow the circulation of said first fluid in a direction substantially parallel to a main direction of circulation of said second fluid in each circulation layer of said second fluid. According to this aspect of the invention, the heat exchangers thus formed are co-current or counter-current.

[0034] The invention also relates to a cooling system comprising a heat exchanger according to the invention.

[0035] Nothing also prevents the design of an air conditioning system comprising a heat exchanger according to the invention.

[0036] The invention also relates to a method of manufacturing such a heat exchanger. In particular, a manufacturing method according to the invention in which said heat exchanger comprises:

[0037] - a circulation enclosure comprising a first inlet for a first fluid in the circulation enclosure and a first outlet of said first fluid outside the circulation enclosure,

[0038] - a second inlet of a second fluid into the circulation enclosure and a second outlet of said second fluid outside the circulation enclosure,

[0039] is characterized in that, said heat exchanger comprising a plurality of circulation plates of said first fluid, each circulation plate of said first fluid comprising:

[0040] - a plurality of conduits configured to allow the circulation of said first fluid between said first inlet and said first outlet,

[0041] - at least a first portion and at least a second portion, said first portion extending mainly along a plane having a non-zero inclination relative to a principal plane along which said second portion extends,

[0042] said circulation plates for said first fluid are arranged such that said first portion of a first circulation plate is arranged substantially parallel to said first portion of a second circulation plate and such that said second portion of a first circulation plate is arranged substantially parallel to said second portion of said second circulation plate, each space between two circulation plates defining a circulation layer for said second fluid.

[0043] The invention also relates to a heat exchanger, a method of manufacturing such a heat exchanger, a cooling system and an aircraft characterized in combination by all or part of the characteristics mentioned above or below. List of figures

[0044] Other aims, characteristics and advantages of the invention will appear on reading the following description given solely for non-limiting purposes and which refers to the appended figures in which:

[0045] [Fig-1] is a schematic longitudinal sectional view of a heat exchanger according to the invention,

[0046] [Fig.2] is a schematic perspective view of a heat exchanger according to the invention,

[0047] [Fig.3] is a schematic view of a detail of a longitudinal end of a heat exchanger according to the invention,

[0048] [Fig.4] a schematic cross-sectional view of a heat exchanger according to the invention.

[0049] Detailed description of an embodiment of the invention

[0050] In the figures, scales and proportions are not strictly observed for the purposes of illustration and clarity. Identical, similar or analogous elements are designated by the same references in all the figures.

[0051] Figures 1 to 4 illustrate an embodiment of a heat exchanger according to the invention. [Fig.l] represents a longitudinal section of a bundle of a heat exchanger. As can be seen in Figures 1 and 2, this heat exchanger comprises a plurality of plates 14 for circulating a first fluid between a first inlet 35 of the first fluid into a circulation enclosure and a first outlet 36 of the first fluid outside the circulation enclosure.

[0052] As can be seen in [Fig.2], the first inlet 35 of the first fluid is a mouth of an inlet box 37 of the first fluid and the first outlet 36 of the first fluid outside the circulation enclosure is a mouth of an outlet box 39 of the first fluid.

[0053] In the embodiment shown here, the inlet 37 and outlet 39 boxes for the first fluid are arranged at the same longitudinal end of the exchanger, the first fluid following a U-shaped configuration within the bundle of the exchanger. At its other longitudinal end, the exchanger here comprises a box 38 for changing the direction of the first fluid (corresponding to the base of the U of the U-shaped circuit). Other types of configurations for circulation of the first fluid and the second fluid are also conceivable, such as a simple cross-flow configuration or a Z-shaped configuration (co-current or counter-current).

[0054] [Fig.2] illustrates the heat exchanger bundle of [Fig.l] to which the first fluid inlet box 37, the first fluid outlet box 39 and the first fluid direction change box 38 have been added.

[0055] As can be seen in Figures 1 and 2, the heat exchanger comprises three portions 20, 21, 22 which are not coplanar with each other, a central portion 20 being arranged between two lateral portions 21 and 22. Line 26 ([Fig.l]) schematizes the limit between the central portion 20 and the lateral portion 21. Similarly, line 27 schematizes the limit between the central portion 20 and the lateral portion 22. Each lateral portion 21, 22 is inclined relative to the central portion 20.

[0056] As can also be seen in Figures 1 and 2, each plate 14 for circulating the first fluid extends so as to have three distinct portions 15, 16, 17 that are substantially planar and not coplanar with each other. Each plate 14 for circulating the first fluid thus comprises a central portion 16 arranged between two lateral portions 15 and 17. Each lateral portion 15, 17 of a plate 14 for circulating the first fluid extends mainly in a plane having a non-zero inclination 25 relative to the main plane along which the central portion 16 of the plate 14 for circulating the first fluid extends. The inclination is between 10° and 50°, and in particular between 20° and 30°.

[0057] As can be seen in [Fig. 4], each plate 14 for circulating the first fluid incorporates a plurality of conduits 18 configured to allow the circulation of the first fluid between the first inlet 35 and said first outlet 36. In the embodiment shown, within each portion 15, 16, 17 of each plate 14 for circulating the first fluid, the conduits 18 extend parallel to each other in a longitudinal direction and in a rectilinear manner. The conduits 18 extend in a continuous (without interruption) within the same plate 14 for circulation of the first fluid, that is to say for example within the lateral portion 17 then within the central portion 16 and finally within the lateral portion 15. The conduits 18 therefore also extend substantially parallel to each other within each portion 15, 16, 17 of the same plate 14 for circulation of the first fluid.

[0058] Each portion 15, 16, 17 of each plate 14 for circulating the first fluid has a cross-section of substantially rectangular shape.

[0059] The heat exchanger shown in Figures 1 to 4 further comprises two external plates 40, 42. Like the plates 14 for circulating the first fluid, the upper external plate 40 (in the views shown in Figures 1 to 4) comprises three flat portions 2, 3, 4 not coplanar with each other, a central portion 3 being arranged between two lateral portions 2 and 4. Similarly, the lower external plate 42 comprises three flat portions 5, 6, 7 not coplanar with each other, a central portion 6 being arranged between two lateral portions 5 and 7.

[0060] The plates 14 for circulating the first fluid are arranged substantially parallel to each other and between the two external plates 40, 42, the portions 2 and 5, 3 and 6, 4 and 7 of which are themselves respectively also arranged substantially parallel to each other and to the plates 14 for circulating the first fluid.

[0061] In the embodiment shown, each lateral portion 15, 17 of each plate 14 for circulating the first fluid is inclined on the same side relative to the central portion 16 and at a substantially identical inclination. Similarly, each plate 14 for circulating the first fluid of the same exchanger is substantially identical, that is to say in particular that each plate 14 for circulating the first fluid has identical dimensions and central portions 16 and lateral portions 15, 17 have identical dimensions to each other. In particular, within each heat exchanger the boundary between the central portion 20 and the lateral portion 21 forms a plane containing the line 26 and orthogonal to each main plane along which each central portion 16 of the plates 14 for circulating the first fluid extends.Likewise, within each heat exchanger the boundary between the central portion 20 and the lateral portion 22 forms a plane containing the line 27 and orthogonal to each main plane along which each central portion 16 of the plates 14 for circulation of the first fluid extends.

[0062] The space between two adjacent plates 14 for circulating the first fluid (immediately adjacent but not in contact with each other) defines a layer for circulating the second fluid between a second inlet and a second outlet of the heat exchanger.

[0063] Each circulation layer of the second fluid is closed on the side of the first inlet 35 of the first fluid, of the first outlet 36 of the first fluid and of the box 38 of changing the direction of the first fluid by closing bars 10, 11, 12. Each closing bar 10, 11, 12 extends longitudinally substantially orthogonally to the longitudinal direction of each plate 14 for circulating the first fluid. The closing bars 10, 11, 12 are arranged at the longitudinal ends of the heat exchanger between the plates 14 for circulating the first fluid and between a plate 14 for circulating the first fluid and each external plate 40, 42.

[0064] The closure bars 10, 11, 12 are configured within each second fluid circulation layer such that each first fluid circulation plate 14 has a substantially identical first fluid circulation length. Furthermore, the closure bars 10, 11, 12 are configured within each second fluid circulation layer such that the width of the passage within which said second fluid circulates is substantially identical within each second fluid circulation layer of said heat exchanger.

[0065] Each closing bar 10, 11, 12 has a flat face 13 arranged towards the inside of the bundle, here in contact with the fins 31 (or flow guide) of undulating shape as can be seen in [Fig.3].

[0066] In the embodiment of the heat exchanger illustrated in Figures 1 to 4, each closing bar 10, 11, 12 is substantially parallelepipedal. However, nothing prevents providing another geometry of the closing bars.

[0067] The closing bar 12 is for example offset by an offset 9 relative to the bar 11. The closing bars 10, 11, 12 used within the exchanger are all identical. Here, each closing bar 10, 11, 12 therefore has an offset 9 thus forming, on the external side of the bundle, a set of steps in the manner of a staircase. This offset is also found inside the bundle, the face 13 of each closing bar 10, 11, 12 being offset relative to the closing bar of the directly adjacent layer. The closing bars 10, 11, 12 of the same portion of the exchanger are therefore offset relative to each other in a direction parallel to the main plane along which said portion of the plate 14 for circulation of the first fluid extends.

[0068] Thus, within the same heat exchanger, each circulation layer of the first fluid (within the circulation plates 14) has a substantially identical length.

[0069] In the embodiment of the heat exchanger illustrated in Figures 1 to 4, each closing bar 10, 11, 12 arranged between two plates 14 for circulation of the first fluid is arranged so as to have an external longitudinal edge aligned with the end of one of said two plates 14 for circulation of the first fluid between which it is arranged.

[0070] In other words, each lateral portion 15, 17 of a circulation plate 14 of the first fluid has two main faces opposite and parallel to each other, each main face being in contact with a closing bar 10, 11, 12, the closing bars being in contact with the same lateral portion 15, 17 of a plate 14 for circulation of the first fluid each having an edge 13 arranged towards a layer for circulation of the second fluid. The edges 13 of each closing bar 10, 11, 12 of the same lateral portion 15, 17 of a plate 14 for circulation of the first fluid extend along separate and parallel planes. Thus, within each circulation layer of the second fluid, the distance between a plane forming the boundary between the central portion 20 and a lateral portion 21, 22 (and containing the line 26, 27) and the edge 13 of the bar 10, 11, 12 closing this circulation layer of the second fluid is constant within the same exchanger.This results in such a shift of the edges 13 of the bars of the second fluid circulation layer one by one, layer after layer. The second fluid circulation layers are therefore identical to each other and make it possible to limit pressure losses and optimize the efficiency of the heat exchanger.

[0071] Each bar 10, 11, 12 for closing a lateral portion 15, 17 of the circulation plates 14 of the exchanger is therefore offset relative to the adjacent (or closest) closing bar in a direction parallel to the main plane along which said lateral portion 15, 17 extends.

[0072] Furthermore, as can be seen in Figures 1 and 2, the heat exchanger does not include a closing bar between the lateral portions 2, 4 and the central portion 4 which would be likely to impact the circulation of the second fluid. The pressure losses within the circulation layers of the second fluid are thus also minimized.

[0073] As can be seen in particular in [Fig. 1] in which the inlet boxes 37 and outlet boxes 39 for the first fluid and the box 38 are not shown (and in [Fig. 3] which shows a detail thereof), each closing bar 11, 12 is arranged between two plates 14 for circulation of the first fluid.

[0074] Weld lines 44 and 45 are visible in [Fig. 2]. They make it possible to secure the inlet box 37 of the first fluid, the outlet box 39 of the first fluid and the box 38 for changing the direction of the first fluid to the bundle, that is to say at the ends of the external plates 40, 42, the closing bars 10, 11, 12 and the plates 14 for circulating the first fluid.

[0075] Fins 30, 31, 32 (or flow guides) are arranged in each circulation layer of the second fluid, that is to say here in what is also called the cold pass of the exchanger. The structure of a heat exchanger according to the invention further allows fins of the same dimensions to be used within the lateral portions 21, 22 and fins of the same dimensions to be used within the central portion 20 of the heat exchanger core. The fins 30, 31, 32 may be formed from corrugated plates forming circulation channels which may have various geometries such as rectangular, triangular, wave-shaped, etc.

[0076] In the embodiment illustrated in Figures 1 to 4, the heat exchanger comprises four plates 14 for circulating the first fluid and five layers for circulating the second fluid, two end circulation layers being respectively formed between the circulation plate 14 closest to the upper outer plate 40 and the upper outer plate 40 itself, and on the other hand, between the circulation plate 14 closest to the lower outer plate 42 and the lower outer plate 42 itself.

[0077] Such a heat exchanger thus makes it possible to have an impact on the pressure losses of the pass of the second fluid circulating between the plates 14 for circulation of the first fluid of less than +20%, an optimization of the fold angles makes it possible to reduce this impact below +5%.

[0078] A heat exchanger according to the invention has an exchanged power similar to that of a so-called flat exchanger with pressure losses of the pass circulating within the plates 14 for circulation of the first fluid which are equivalent.

[0079] To achieve these performances, the height of the fins 30, 31, 32 was defined as a function of the inclination 25, thus for angles of 20° and 30°, the ratios of the heights of fins 30, 31, 32 (or “intercalaries”) (height of the fins 31, 32 within the lateral portions 21 or 22 / height of the fins 30 within the central portion 20) are respectively 0.92 and 0.81.

[0080] The heat exchanger can be installed within a system for cooling a gaseous or liquid fluid but also in other applications such as a condenser.

[0081] Each plate 14 for circulation of the first fluid can for example be prepared by brazing portions of tubes intended to form the conduits 18 in contact with a notched flow guide in each of which such a portion of tube is predisposed.

Claims

1.

2.

3. Claims Heat exchanger (1) comprising: • a circulation enclosure comprising a first inlet (35) for a first fluid into the circulation enclosure and a first outlet (36) for said first fluid outside the circulation enclosure, • a second inlet for a second fluid into the circulation enclosure and a second outlet for said second fluid outside the circulation enclosure, characterized in that said exchanger comprises a plurality of plates (14) for circulating said first fluid, each plate (14) for circulating said first fluid comprising: • a plurality of conduits (18) configured to allow the circulation of said first fluid between said first inlet (35) and said first outlet (36), • at least one first portion (15) and at least one second portion (16), said first portion (15) extending mainly along a plane having a non-zero inclination (25) relative to a main plane along which said second portion (16) extends, and in that said plates (14) for circulating said first fluid are configured such that said first portion (15) of a first circulation plate (14) is arranged substantially parallel to said first portion (15) of a second circulation plate (14) and such that said second portion (16) of a first circulation plate (14) is arranged substantially parallel to said second portion (16) of said second circulation plate (14), each space between two circulation plates (14) defining a circulation layer of said second fluid. Heat exchanger according to claim 1, characterized in that said inclination (25) is at least equal to 10°. Heat exchanger according to any one of claims 1 or 2, characterized in that said inclination (25) is between 15° and 50°.

4. Heat exchanger according to one of claims 1 to 3, characterized in that said conduits (18) extend substantially parallel to each other within said first portion (15) and within said second portion (16) of said plate (14) for circulation of said first fluid.

5. Heat exchanger according to one of claims 1 to 4, characterized in that each circulation plate (14) further comprises a third portion (17), said third portion (17) extending mainly along a plane having a non-zero inclination (25) relative to a main plane along which said second portion (16) extends, said second portion (16) connecting said first portion (15) and said third portion (17).

6. Heat exchanger according to one of claims 1 to 5, characterized in that it further comprises bars (10, 11, 12) for closing each circulation layer of said second fluid, at least one closing bar (11, 12) being arranged between two plates (14) for circulation of the first fluid.

7. Heat exchanger according to claim 6, characterized in that at least one closing bar (11, 12) is arranged between said first portion (15) of said first circulation plate (14) and said first portion (15) of said second circulation plate (14).

8. Heat exchanger according to one of claims 6 or 7, characterized in that the closing bars (10, 11, 12) in contact with at least a first portion (15) of the circulation plates (14) of said exchanger are offset relative to each other in a direction parallel to the main plane along which a first portion (15) of a plate (14) for circulation of the first fluid extends.

9. Heat exchanger according to one of claims 1 to 8, characterized in that each plate (14) for circulation of said first fluid is formed from a single piece integrating said conduits (18).

10. Cooling system comprising a heat exchanger according to one of claims 1 to 9.

11. A method of manufacturing a heat exchanger (1), said heat exchanger comprising: • a circulation enclosure comprising a first inlet (35) for a first fluid in the circulation enclosure and a first outlet (36) for said first fluid outside the circulation enclosure; traffic, • a second inlet for a second fluid into the circulation enclosure and a second outlet for said second fluid outside the circulation enclosure, characterized in that, said heat exchanger comprising a plurality of plates (14) for circulating said first fluid, each plate (14) for circulating said first fluid comprising: • a plurality of conduits (18) configured to allow the circulation of said first fluid between said first inlet (35) and said first outlet (36), • at least one first portion (15, 17) and at least one second portion (16), said first portion (15, 17) extending mainly along a plane having a non-zero inclination (25) relative to a main plane along which said second portion (16) extends, said circulation plates (14) for said first fluid are arranged such that said first portion (15, 17) of a first circulation plate (14) is arranged substantially parallel to said first portion (15, 17) of a second circulation plate (14) and such that said second portion (16) of a first circulation plate (14) is arranged substantially parallel to said second portion (16) of said second circulation plate (14), each space between two circulation plates (14) defining a circulation layer for said second fluid.

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