CN115176120A

CN115176120A - Heat exchanger

Info

Publication number: CN115176120A
Application number: CN202180016817.6A
Authority: CN
Inventors: M.奥古斯丁; M.贝尔佐夫斯基; T.斯特拉梅基; D.索斯特克
Original assignee: Valeo Autosystemy Sp zoo
Current assignee: Valeo Autosystemy Sp zoo
Priority date: 2020-02-28
Filing date: 2021-02-15
Publication date: 2022-10-11
Also published as: EP3872435A1; EP3872435B1; WO2021170438A1

Abstract

A heat exchanger (1), in particular for a motor vehicle, comprising: a first manifold (2) comprising a first tank (2 a) and a first header (2 b); a second manifold (3) comprising a second tank (3 a) and a second header (3 b); a connector block (7) comprising an inlet Rin and an outlet Rout for fluid, wherein the connector block (7) is in fluid connection with the first manifold (2); -a plurality of tubes (4) forming at least one stack arranged between a first manifold (2) and a second manifold (3), the tubes (4) comprising open ends received in the manifolds (2, 3), wherein the first manifold (2) and the second manifold (3) are in fluid connection with each other, forming a primary passage (10) and a secondary passage (20) for the fluid, characterized in that the primary passage (10) is defined by at least two tubes (4) located at the end of the stack, the secondary passage (20) being located between the tubes (4) forming the primary passage (10).

Description

Heat exchanger

Technical Field

The present invention relates to a heat exchanger, in particular for a motor vehicle.

Background

Heat exchangers commonly used in the industry may include means for redirecting fluid within the core in order to increase the distance traveled by the fluid, thereby improving the overall performance of the heat exchanger. Sometimes, fluid is transferred between adjacent sections to avoid complicated solutions. The formation of multiple passages inside the core of a heat exchanger is often problematic due to increased pressure drop and limited packaging. Excessive pressure drop also affects performance in an indirect manner due to increased work consumption caused by compression. In the case of a heat exchanger having two manifolds connected by heat exchange tubes, so-called "dead zones" occur in which the flow of the heat exchange fluid is restricted. Thus, providing uniform fluid distribution in a heat exchanger including a manifold is problematic.

One of the known solutions to promote an optimal and uniform distribution of the fluid circulating through the heat exchanger is to divide the heat exchanger into a plurality of sections by blocking or restricting the fluid flow within the manifold. However, the currently known solutions do not suggest providing uniformity of the fluid distribution, which generally negatively affects the efficiency of the entire heat exchanger. Sometimes, the fluid is not delivered uniformly into the tube, which may indicate uniformity issues, especially in this area. This especially relates to the case of a much smaller cross-section for the flow of fluid from the first passage to the second passage, which may result in a significant pressure drop.

Accordingly, it is desirable to provide a heat exchanger that increases efficiency and reduces pressure drop.

Disclosure of Invention

The object of the present invention is a heat exchanger, in particular for a motor vehicle, comprising:

a first manifold comprising a first tank and a first header,

a second manifold comprising a second tank and a second header,

-a connecting block comprising an inlet R for fluid _in And an outlet R _out Wherein the connector block is in fluid connection with the first manifold,

-a plurality of tubes forming at least one stack arranged between a first manifold and a second manifold, the tubes comprising open ends received in the manifolds,

wherein the first and second manifolds are fluidly connected to each other forming a primary passage and a secondary passage for fluid, characterized in that the primary passage is defined by at least two tubes located on an end of the stack and the secondary passage is located between the tubes forming the primary passage.

Preferably, the tubes are arranged in a first stack comprising a first stacking direction, the second stack comprising a second stacking direction parallel to the first stacking direction, wherein the second stack is spaced apart from the first stack in a third direction perpendicular to the first and second stacking directions.

Preferably, the at least two tubes located at the end of the first stack are at the same height as the at least two tubes located at the end of the second stack.

Preferably, the first stack and the second stack are in fluid connection with a first manifold to provide at least one U-turn for the fluid, wherein the U-turn is formed between at least one tube of the first stack and a corresponding tube of the second stack.

Preferably, the first stack comprises tube portions P1, P2 and S1, wherein the tube portions P1 and P2 form a primary passage within the first stack and the tube portion S1 forms a secondary passage of the first stack.

Preferably, the second stack comprises secondary tube portions P3, P4 and S2, wherein the tube portions P3 and P4 form the primary passage of the second stack and the tube portion S2 forms the secondary passage of the second stack, wherein the tube portion S2 is located between the tube portions P3, P4 forming the primary passage.

Preferably, the first manifold is divided into inlet passagesA channel and an outlet channel, wherein the inlet channel is connected with the inlet R of the connecting block _in And the primary channel of the first stack of tubes, the outlet channel being in fluid connection with the outlet R of the connecting block _out And the primary passage of the second stack of tubes.

Preferably, the first tank comprises at least one partition configured to block fluid communication between the sub-passage, the inlet channel and the outlet channel.

Preferably, the tube part and the tube part pass through the inlet channel and the inlet R _in Is in fluid connection.

Preferably, the pipe sections P3 and P4 pass through the outlet channel with the outlet R _out Is in fluid connection.

Preferably, the pipe sections P1 and P2 are fluidly isolated from the pipe sections P3 and P4 within the second manifold.

Preferably, the tube section S1 is fluidly connected to the tube section S2 to form at least one U-turn in the first manifold.

Preferably, the pipe section S1 is adapted to collect the fluid coming from the pipe sections P1 and P2 inside the second manifold.

Preferably, the tube section S2 is adapted to distribute the fluid between the tube sections P3 and P4 within the second manifold.

Preferably, the first manifold comprises at least one protuberance configured to form at least one channel for fluid inside the first tank.

Drawings

Examples of the invention will become apparent and described in detail with reference to the accompanying drawings, in which:

figure 1 shows a flow arrangement through a heat exchanger in a first example,

figure 2 shows a schematic view of the flow arrangement in a heat exchanger,

figure 3 shows an exploded view of the heat exchanger in a second example,

fig. 4 shows a first manifold assembly and a second manifold assembly in a second example.

Detailed Description

The present invention relates to a heat exchanger in which at least two media are guided through predetermined paths to exchange heat between each other. The subject of the invention relates in particular to a heat exchanger 1, which heat exchanger 1 can be used in a motor vehicle comprising, for example, an internal combustion engine, an electric motor or a combination of both types.

The heat exchanger may be used, for example, as an air cooled condenser (ACDS), a water cooled condenser (WCDS), an air gas cooler, or a chiller (chiller), a device for cooling water and/or cooling fluid that has been heated while cooling a battery in an electric vehicle.

Fig. 1 shows a heat exchanger 1 which can be used in a motor vehicle. Such a heat exchanger usually comprises several key elements, in particular a first manifold 2 and a second manifold 3. The

manifolds

2, 3 may have different shapes and forms, but the most common manifolds generally have a tubular or rectangular shape. Depending on the type of heat exchanger 1, the

manifolds

2, 3 may comprise other elements, such as an inlet R _in Outlet R _out Integrated connection blocks 7, mounting brackets, so-called jumpers, covers for closing the manifolds, baffles, etc. Furthermore, the first manifolds 2 do not have to be constructed in the same way as the second manifolds 3, as they can be optimized to improve the overall performance of the heat exchanger 1. There may be different types of

manifolds

2, 3 which are disclosed in the following embodiments of the invention, and therefore the invention is not limited to forming only one particular type of sub-component of the heat exchanger 1.

The heat exchanger 1 further comprises a plurality of tubes 4, the tubes 4 forming at least one stack disposed between the first manifold 2 and the second manifold 3. All types of tubes 4 typically comprise open ends which are received in the

manifolds

2, 3, although the tubes 4 may have different forms and shapes depending on the type of heat exchanger 1. The first manifold 2 typically includes a plurality of slots configured to receive one end of the tubes 4, and the second manifold 3 also includes a plurality of slots configured to receive the other open end of the respective tubes 4. This enables a fluid connection between the

manifolds

2, 3 and the tubes 4. The tube 4 may be in the form of an extruded tube, a folded tube, a plate comprising microchannels and fluid channels formed by a stamped plate.

One way to optimize the efficiency of the heat exchanger 1 is to force the fluid to flow through an organized predetermined path. The path of the fluid flowing through the heat exchanger can be considered as the inlet R of the heat exchanger 1 during the operating mode of the heat exchanger 1 _in And an outlet R _out The sum of the paths between. The term "passage" is understood to mean a group or subset of tubes 4 in which the fluid follows the same direction in the same direction of flow. In the tubes 4 of the same channel, the open ends of the tubes 4 are located in particular in the two

opposite manifolds

2, 3. The direction of fluid flow may be reversed when moving from one passage to another. Thus, the path of the fluid through the heat exchanger 1 may be extended.

The heat exchanger 1 may comprise at least two passes, wherein the primary pass 10 is defined by at least two tubes 4 located at the end of a particular stack. In other words, if at least one tube 4 is the top first tube of a particular stack, while another tube 4 is the bottom tube of the same stack, and the fluid follows the same direction in the same flow direction in these tubes 4, these tubes 4 form the primary channels 10. At least one secondary passage 20 is located between the tubes 4 forming the primary passage 10.

As shown in FIG. 1, a portion of the primary section 10 is located at the inlet R _in And (ii) adjacent, wherein the arrows indicate the direction of flow. In this example, the primary and

secondary passages

10, 20 share the same first manifold 2 on one side and the second manifold 3 on the other side. Through the inlet R _in The fluid entering the heat exchanger 1 is distributed by the first manifold 2 over the primary channels 10 at the top and bottom of the stack. The top portion of the first manifold 2 may be fluidly connected to the bottom portion of the first manifold 2 by, for example, a jumper, as shown in fig. 1. This allows an even distribution of the fluid over the first manifold 2 and thus over the primary channels 10. The fluid travels along the primary passage 10 until it reaches the second manifold 3, where it is collected from its top and bottom portions, and it further reverses to flow into the secondary passage 20. The heat exchanger 1 may comprise only one secondary passage 20, but in other embodiments of the invention it may comprise two or moreAnd a plurality of sub-passages 20. Next, the fluid is collected and directed to the outlet R of the heat exchanger 1 _out 。

Fig. 2 shows a schematic view of a refrigerant flow arrangement in a heat exchanger 1, which heat exchanger 1 comprises a first stack and a second stack of tubes 4.

The first stack is formed by tube portions P1, P2 and S1, wherein the tube portions P1 and P2 form a primary passage 10 within the first stack and the tube portion S1 forms a secondary passage 20 of the first stack. Similarly, the second stack is formed by secondary tube portions P3, P4 and S2, wherein the tube portion P3 and the tube portion P4 form the primary passage 10 of the second stack and the tube portion S2 forms the secondary passage 20 of the second stack.

Fluid passing inlet R _in Enters the heat exchanger 1 and then enters the primary passage 10 through both the pipe portion P1 and the pipe portion P2. Next, the fluid enters the tube portion S1 located between the tube portion P1 and the tube portion P2, where P1, P2, and S1 are arranged in the first stacked body. The fluid makes a U-turn in the first stack, between tube section P1 and tube section S1, and between tube section P2 and tube section S1. Next, the fluid flows through the tube portion S1 of the first stack. The fluid makes a U-turn between the tube section S1 and the tube section S2. It is to be noted that the U-turn is made between the first stack and the second stack, but within the tubes 4 forming the sub-passages 20. The fluid flows further through the tube section S2 and is split into two flows, one of which makes a U-turn with respect to the tube section S2 and flows into the tube section P3, and the other of which also makes a U-turn with respect to the tube section S2, but it enters the tube section P4. It should be noted that the U-turn is made in the second manifold 3 between the second section 20 and the first section 10. Finally, the fluid is directed to the outlet R _out To leave the heat exchanger 1.

Fig. 3 shows an exploded view of a heat exchanger 1, which heat exchanger 1 is adapted to cooling one medium (e.g. coolant) with another medium (e.g. R744 refrigerant), wherein both media are enclosed in one device. This type of heat exchanger 1 involves two fluid circuits enclosed in one casing 30. In this type of heat exchanger 1, the coolant fluid, delimited by the plastic shell 30, generally flows through and around a metal core for the refrigerant, enclosed within said shell 30.

The refrigerant circuit of the heat exchanger 1 may comprise a connection block 7, a first manifold 2, a second manifold 3 and a plurality of tubes 4 located therebetween.

The connecting block 7 may be made from a unitary piece of material, for example a lightweight metal alloy such as aluminium. The shape of the connecting block 7 generally corresponds to the shape of the opening 31 located on the housing 30, so that the connecting block 7 may partially protrude from the housing 30. Preferably, the connecting piece 7 is substantially rectangular. Furthermore, the connection block 7 comprises at least one inlet R _in And at least one outlet R _out Wherein the inlet R _in Configured to introduce a first fluid into the first manifold 2, outlet R _out Configured to collect the first fluid from the first manifold 2. Inlet R _in And an outlet R _out They pass through the body of the connection block 7, generally from the top of the body of the connection block 7 towards the first manifold 2. Inlet R _in And an outlet R _out May have a circular cross-section. The connection block 7 may further comprise a recess 8, which recess 8 may be used for tightly connecting the connection block 7 to the refrigerant circuit. The recess 8 may have different shapes depending on the type of connection desired. The recess 8 shown in fig. 2 is a cut in the material of the connection piece 7, however other shapes suitable for tightly connecting the connection piece 7 to the rest of the loop are also conceivable.

The connecting block 7 may also comprise a sealing area adapted to receive a sealing means, such as a synthetic gasket. The sealing area may be in the form of a cut along the periphery of the connecting piece 7. The sealing area should be arranged in the vicinity of the opening 31 on the housing 7 to provide a fluid tight connection.

As shown in fig. 3, the tubes 4 are arranged between the first manifold 2 and the second manifold 3. The tubes 4 may be in the form of plates and may include open ends that lead into the channels of the

respective headers

2b, 3 b. The tube 4 may comprise a top side and a bottom side and two lateral sides, wherein the top and bottom sides have a larger surface than the lateral sides. The tube 4 may also comprise a general plane parallel to its top and bottom sides. The tubes 4 may be arranged in at least two parallel stacks, each stack comprising a top end tube and a bottom end tube, wherein the top end tube and the bottom end tube are arranged on the ends of the same stack to form the primary passage 10. The term "parallel stack" should be considered to be a stack of at least two tubes 4 arranged side by side in parallel, such that the top and bottom sides are parallel to each other.

The open ends of the tubes 4 forming each stack are connected to the first manifold 2 on one side and to the second manifold on the other side. Furthermore, the tubes of each stack may be interleaved with heat sink portions 9, such as fins, turbulator fins, etc., wherein the stacks do not share the same set of heat sink portions 9. This allows adjacent stacks to separate in material, thereby creating a gap between the stacks. The heat dissipation portions 9 may be staggered between all the tubes 4 forming the stack. Furthermore, the tubes 4 may comprise bent ends allowing the formation of pairs of tubes 4, which may be introduced into respective slots. This makes it possible to reduce the amount of connection zones between the tubes 4 and the

manifolds

2, 3, which are most prone to leaks. Furthermore, it promotes the coolant fluid flow between the tubes 4 and the first manifold 2. Alternatively, the tube 4 may be straight; however, the number of slots in the first and

second manifolds

2, 3 should be increased accordingly.

The first manifold 2 and the second manifold 3 may be in fluid cooperation with each other to provide a primary passage 10 and a secondary passage 20 in the heat exchanger 1.

In the basic embodiment of the present invention, the total number of tubes 4 forming the primary passage 10 is equal to the total number of tubes 4 forming the secondary passage 20. This provides a reasonably uniform fluid distribution between the

channels

10, 20. However, the total number of tubes 4 forming the primary passage 10 may be different from the total number of tubes 4 forming the secondary passage 20. For example, the number of tubes 4 forming the primary passage 10 may be greater than the number of tubes forming the at least one secondary passage 20. It enables further optimization of the performance of the heat exchanger 1 in some applications.

As mentioned in the preceding paragraph, the heat exchanger 1 may comprise different types of tubes 4, depending on the type thereof. As shown in fig. 2 and 3, the

manifolds

2, 3 receive in a channel a pair of tubes 4, in particular two tubes 4, both having a specific shape. This facilitates the production process, increases the efficiency of the heat exchanger and, above all, it reduces the risk of leakage from the weakest areas, i.e. the connections between the tubes 4 and the channels of the

manifolds

2, 3.

Figure 4 shows in detail the sub-components forming the

manifolds

2, 3. The connection block 7 may be in fluid connection with the first manifold 2, wherein the first manifold 2 participates in the distribution and collection of the first fluid. The fluid being supplied from an inlet R in the corresponding connector 7 _in Is assigned by the inlet channel 21 and is assigned by the outlet R corresponding to the connector 7 _out The outlet channel 22. The first manifold 2 may include a first tank 2a and a first header 2b configured to define a flow path to the tubes 4. The first tank 2a may be in the form of a unitary block of material including openings for fluid, which enables fluid communication between the connector block 7 and the first manifold 2. Naturally, the first tank 2a is closed at the bottom by, for example, an end plate 2 c. The first tank 2a is in fluid connection with a first manifold 2b comprising several sub-components. The first header 2b may comprise a first plate comprising a slot for receiving the tube 4, e.g. a single slot of the first plate may receive a pair of tubes 4. Alternatively, the slots are configured to receive only one tube 4, such that the number of slots arranged on the first plate is equal to the number of tubes 4. The first header 2b is tightly connected, e.g. crimped, with the first tank 2a to ensure correct positioning of the first header 2b with respect to the first tank 2a and to facilitate the formation of a fluid-tight connection, e.g. after welding one to the other. Further, the first header 2b includes at least one second plate disposed between the first plate and the first tank 2 a. The second plate may comprise at least one opening configured to enable fluid communication between adjacent stacks of tubes 4. This enables fluid communication between the secondary passages 20 within the first manifold 2.

The first manifold 2 may also comprise at least one ridge 6 forming an inlet channel 21 and an outlet channel 22 for the fluid. The number of elevations 6 may be equal to the number of channels 21, 22.

The

channels

10, 20 may be defined by a first manifold 2, the first manifold 2 comprising at least one partition 5 located on a first tank 2 a. The partition portion 5 is configured to guide the refrigerant fluid through the first header 2b into the refrigerant fluid forming the primary passage 10The desired tube 4. The partition portion 5 may block fluid communication between the inlet channel 21 of the first tank 2a and the tube 4 forming the sub passage 20. Furthermore, the primary tank 2a is configured to collect and direct the fluid towards the outlet R of the connection block 7 _out . The primary header 2b may fluidly connect not only the first tank 2a and the tubes 4 forming the primary passages 10, but also the tubes 4 forming the secondary passages 20 of an adjacent stack of tubes 4. Thus, the first manifold 2 provides at least one U-turn for the refrigerant fluid.

The partition part 5 may be in the form of a material remaining in the process of forming the inlet passage 21 and/or the outlet passage 22 in the first tank 2 a. The material forming the manifold is partially removed to provide fluid communication between the first manifold 2 and one of the

channels

10, 20. Thus, the remaining material may form one or more separating portions 5.

The second manifold 3 may comprise a second tank 3a and a second header 3b, wherein the second manifold 3 functions as a refrigerant fluid distributor. In other words, the second manifold 3 receives fluid from one portion of the tubes 4 and transfers it to another portion of the tubes 4.

The second header 3b may comprise at least one third plate comprising a slot for receiving the tubes 4, e.g. a single slot of the third plate may receive a pair of tubes 4. Alternatively, the slots are configured to receive only one tube 4, such that the number of slots arranged on the third plate is equal to the number of tubes 4 received therein. As shown in fig. 4, the second header includes two third plates.

The second tank 3a comprises, in particular, a cover plate, which is substantially flat and provides closure of the second manifold 3, and at least one fourth plate configured to convey the first fluid from the top portion of the second manifold 3 to the bottom portion of the second manifold 3. One way of creating the fourth plate may be to form a plate with a plurality of parallel openings extending from its top portion to its bottom portion, which will provide fluid communication with the sub-components of the second manifold 3.

The second header 3b is tightly connected, e.g. crimped, with the second tank 3a to ensure correct positioning of the second header 3b with respect to the second tank 3a and to facilitate the formation of a fluid tight connection after e.g. welding one to the other.

In order to provide a fluid-tight and rigid connection between the tubes 4 and the

manifolds

2, 3, the ends of each tube 4 are introduced into their

respective manifolds

2, 3 such that they completely penetrate the first and third plates and partially penetrate the second and fourth plates.

Fig. 4 also includes exemplary locations of the primary passage 10 and the secondary passage 20. In particular, the primary channels 10 will be fluidly connected to four cells of each stack, two of which are located in the top portion of the

headers

2b and 3b and two of which are located in the bottom portion of the

headers

2b and 3 b. The secondary passage 20 is formed by four slots arranged between the slots forming the primary passage 10.

In one example, two tubes 4 at the top of each stack and two tubes 4 at the bottom of each stack may be secured (e.g., brazed) with six heat dissipation portions 9, the heat dissipation portions 9 interleaved between the tubes 4, while the top and bottom tubes 4 may include heat dissipation portions 9 secured to peripheral ends of the stacks. Furthermore, the four tubes 4 located in the middle of the stack may be fixed to the five inner radiating portions 9. The above features do apply particularly to water cooler heat exchangers, but other types of heat exchangers are also envisaged as they follow the same principles as water coolers. For example, air-cooled condensers and air-gas coolers comprising top and bottom tubes 4 not participating in the fluid circulation, in water-cooled condensers the first and last pass conducts coolant to improve resistance to high pressure, which means that, for example, the tube 4 at the top of the stack and the tube 4 at the bottom of the stack conduct refrigerant with a larger heat exchange surface with the second medium than the other passes.

Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

1. A heat exchanger (1), in particular for a motor vehicle, comprising:

a first manifold (2) comprising a first tank (2 a) and a first header (2 b),

a second manifold (3) comprising a second tank (3 a) and a second header (3 b),

-a connection block (7) comprising an inlet R for a fluid _in And an outlet R _out Wherein the connection block (7) is in fluid connection with the first manifold (2),

-a plurality of tubes (4) forming at least one stack arranged between the first manifold (2) and the second manifold (3), the tubes (4) comprising open ends received in the manifolds (2, 3),

wherein the first manifold (2) and the second manifold (3) are in fluid connection with each other, forming a primary passage (10) and a secondary passage (20) for fluid, characterized in that the primary passage (10) is defined by at least two tubes (4) located on the ends of the stack, the secondary passage (20) being located between the tubes (4) forming the primary passage (10).

2. The heat exchanger (1) according to claim 1, wherein the tubes (4) are arranged in a first stack comprising a first stacking direction, the second stack comprising a second stacking direction parallel to the first stacking direction, wherein the second stack is spaced apart from the first stack in a third direction perpendicular to the first and second stacking directions.

3. The heat exchanger (1) according to claim 2, wherein at least two tubes (4) located on the end of the first stack are at the same height as at least two tubes (4) located on the end of the second stack.

4. The heat exchanger (1) according to any of the preceding claims, wherein the first and second stacks are in fluid connection with the first manifold (2) to provide at least one U-turn for the fluid, wherein the U-turn is formed between at least one tube (4) of the first stack and a respective tube (4) of the second stack.

5. The heat exchanger (1) according to any of the preceding claims, wherein the first stack comprises pipe sections (P1), (P2) and (S1), wherein a pipe section (P1) and a pipe section (P2) form a primary passage (10) within the first stack and a pipe section (S1) forms a secondary passage (20) of the first stack.

6. Heat exchanger (1) according to any of the preceding claims, wherein the second stack comprises secondary pipe sections (P3), (P4) and (S2), wherein a pipe section (P3) and a pipe section (P4) form a primary passage (10) of the second stack and a pipe section (S2) forms a secondary passage (20) of the second stack, wherein a pipe section (S2) is located between the pipe sections (P3), (P4) forming the primary passage (10).

7. Heat exchanger (1) according to any of the preceding claims, wherein the first manifold (2) is divided into an inlet channel (21) and an outlet channel (22), wherein the inlet channel (21) is in communication with the inlet R of the connection block (7) _in And the primary channel (10) of the first stack of tubes (4), the outlet channel (22) being in fluid connection with the outlet R of the connecting block (7) _out And the primary passages (10) of the second stack of tubes (4).

8. The heat exchanger (1) according to claim 7, wherein the first tank (2 a) comprises at least one partition (5), the partition (5) being configured to block fluid communication between the sub-passage (20), the inlet channel (21) and the outlet channel (22).

9. The heat exchanger (1) according to any of the preceding claims, wherein a pipe section (P1) and a pipe section (P2) pass through the inlet channel (21) and the inlet R _in Are in fluid connection.

10. The heat exchanger (1) according to any of the preceding claims, wherein a pipe section (P3) and a pipe section (P4) are in communication with the outlet R through the outlet channel (22) _out Is in fluid connection.

11. The heat exchanger (1) according to any of the preceding claims, wherein the tube portion (P1) and the tube portion (P2) are fluidly isolated from the tube portions (P3) and (P4) within the second manifold (3).

12. The heat exchanger (1) according to any of the preceding claims, wherein a tube section (S1) is fluidly connected with a tube section (S2) to form at least one U-turn in the first manifold (2).

13. Heat exchanger (1) according to any of the previous claims, wherein a pipe section (S1) is adapted to collect inside the second manifold (2) the fluid coming from the pipe sections (P1) and (P2).

14. The heat exchanger (1) according to any of the preceding claims, wherein a tube section (S2) is adapted to distribute fluid between tube sections (P3) and (P4) within the second manifold (3).

15. The heat exchanger (1) according to any of the preceding claims, wherein the first manifold (2) comprises at least one ridge (6) configured to form at least one channel (21, 22) for the fluid inside the first tank (2 a).