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CN-120239801-B - Heat exchanger for a motor vehicle

CN120239801BCN 120239801 BCN120239801 BCN 120239801BCN-120239801-B

Abstract

The invention relates to a heat exchanger (50) for a motor vehicle, comprising-a first heat exchange section (1) configured to allow heat exchange between a refrigerant fluid and an air flow (F), comprising a first bundle of tubes (3) forming a set of flow channels for the refrigerant fluid, -a second heat exchange section (2) configured to allow heat exchange between a heat transfer liquid and the air flow (F), comprising a second bundle of tubes (4) forming a set of flow channels for the heat transfer liquid, wherein the tubes (3) in the first bundle of tubes have a U-shape with a first branch (5) and a second branch (7) connected by a base (6), wherein the first branch (5) is arranged upstream of the second branch (7) in the flow direction of the air flow (F), and wherein the second bundle of tubes (4) is arranged between the first branch (5) and the second branch (7) of the tubes (3).

Inventors

  • S. Carl
  • M. Ahia
  • B. Nicholas

Assignees

  • 法雷奥热系统公司

Dates

Publication Date
20260508
Application Date
20231116
Priority Date
20221122

Claims (15)

  1. 1. A heat exchanger (50) for a motor vehicle, comprising: a first heat exchange section (1) configured to allow heat exchange between the refrigerant and the air stream (F), The first heat exchange section (1) comprises a first bundle (11) of tubes (3) forming a set of refrigerant flow channels configured to be arranged in the air flow (F), A second heat exchange section (2) configured to allow heat exchange between a heat transfer liquid and said air flow (F), The second heat exchange section comprising second bundle (12) of tubes (4) forming a set of heat transfer liquid flow channels configured to be arranged in the air flow (F), Wherein the tubes (3) of the first bundle (11) of tubes have a U-shape comprising a first branch (5) and a second branch (7) connected by a base (6), Wherein the first branch (5) is positioned upstream of the second branch (7) in the flow direction of the air flow (F), and Wherein the second bundle (12) of tubes is arranged between the first branch (5) and the second branch (7) of tubes (3) in the first bundle (11) of tubes in the flow direction of the air flow (F).
  2. 2. The heat exchanger (50) of claim 1, wherein each tube (3) of the first bundle (11) of tubes extends in a plane, Wherein the tubes (3) of the first bundle (11) of tubes are arranged in parallel planes, and Wherein the tubes (3) in the first bundle (11) of tubes are aligned in a direction (D) perpendicular to the plane of the tubes.
  3. 3. The heat exchanger (50) according to claim 2, wherein the second bundle (12) of tubes (4) extends between two parallel planes (P2, P2 '), the two planes (P2, P2') being perpendicular to the plane of the tubes (3) of the first bundle (11).
  4. 4. The heat exchanger (50) of any one of the preceding claims, wherein the base (6) of a tube (3) in the first bundle (11) of tubes is spaced apart from the base of an adjacent tube (3).
  5. 5. A heat exchanger (50) according to any one of claims 1 to 3, wherein the outer circumference of the tubes (3) in the first bundle (11) of tubes has an oblong cross-section defining a major axis and a minor axis, wherein the major axis of the first branch (5) of tubes is parallel to the air flow (F), Wherein the long axis of the second branch (7) of the tube (3) is parallel to the air flow (F), and Wherein the long axis of the base (6) of the tube (3) is perpendicular to the air flow (F).
  6. 6. A heat exchanger (50) according to any one of claims 1 to 3, wherein the base (6) of a tube (3) of the first bundle (11) of tubes defines an underside of the heat exchanger (50) when the heat exchanger (50) is in a nominal position for installation in a vehicle, and Wherein the first branch (5) of the tubes (3) in the first bundle (11) of tubes extends along a vertical axis (Z) when the heat exchanger (50) is in a nominal position mounted in a vehicle.
  7. 7. A heat exchanger (50) according to any one of claims 1 to 3, wherein the base (6) of a tube (3) of the first bundle (11) of tubes defines a lateral side of the heat exchanger (50) when the heat exchanger (50) is in a nominal position for installation in a vehicle, and Wherein the first branch (5) of the tubes (3) in the first bundle (11) of tubes extends along a horizontal axis when the heat exchanger (50) is in a nominal position mounted in a vehicle.
  8. 8. A heat exchanger (50) according to any one of claims 1 to 3, wherein the first ends (15) of the tubes (3) in the first bundle (11) of tubes open into a first distributor (9), the first distributor (9) being configured to distribute the refrigerant among all the tubes (3) in the first bundle (11) of tubes, Wherein the second ends (16) of the tubes (3) in the first bundle (11) of tubes open into a first manifold (10), the first manifold (10) being configured to collect the refrigerant from all the tubes (3) in the first bundle (11) of tubes, and Wherein the first distributor (9) is positioned downstream of the first manifold (10) in the flow direction of the air flow (F) when the heat exchanger (50) is in a nominal position mounted in a vehicle.
  9. 9. A heat exchanger (50) according to any one of claims 1 to 3, Wherein a first end (15) of the tubes (3) of the first bundle (11) opens into a first distributor (9), the first distributor (9) being configured to distribute the refrigerant among all the tubes (3) of the first bundle (11), Wherein the second ends (16) of the tubes (3) in the first bundle (11) of tubes open into a first manifold (10), the first manifold (10) being configured to collect the refrigerant from all the tubes (3) in the first bundle (11) of tubes, and Wherein the first manifold (10) is positioned downstream of the first distributor (9) in the flow direction of the air flow (F) when the heat exchanger (50) is in a nominal position mounted in a vehicle.
  10. 10. A heat exchanger (50) according to any one of claims 1 to 3, wherein the length (L1) of the first branch (5) of the tubes (3) in the first bundle (11) of tubes is smaller than the length (L2) of the second branch (7) of the tubes (3) in the first bundle (11) of tubes.
  11. 11. A heat exchanger (50) according to any one of claims 1 to 3, comprising a support (30) connecting the second heat exchange section (2) to the base (6) of a tube (3) in the first bundle (11) of tubes.
  12. 12. The heat exchanger (50) of claim 11, wherein the support (30) has a thermal conductivity lower than that of the tubes (3) of the first bundle (11).
  13. 13. The heat exchanger (50) of claim 12, wherein the support (30) comprises a sealing wall (27), the sealing wall (27) connecting the second heat exchange section (2) to the base (6) of the tubes (3) in the first bundle (11) of tubes, thereby preventing the air flow (F) from circulating between the second heat exchange section (2) and the base (6) of the tubes (3) in the first bundle (11) of tubes.
  14. 14. A heat exchanger (50) according to any one of claims 1 to 3, wherein the tubes (4) in the second bundle (12) of tubes extend transversely to the tubes (3) in the first bundle (11) of tubes.
  15. 15. A heat exchanger (50) according to any one of claims 1 to 3, wherein the tubes (4) in the second bundle (12) of tubes extend parallel to the first branches (5) of the tubes (3) in the first bundle (11) of tubes.

Description

Heat exchanger for a motor vehicle Technical Field The present invention relates to the field of heat exchangers, in particular for motor vehicles. Such an exchanger may be installed in a thermal conditioning system installed on a motor vehicle. In the case of electric vehicles, such thermal conditioning systems make it possible to ensure thermal conditioning of various parts of the vehicle, such as the vehicle interior or an electrical energy storage battery. The heat exchange is mainly managed by compression and expansion of the refrigerant flowing in a circuit in which a plurality of heat exchangers are arranged. The compressor makes it possible to bring the refrigerant to a high pressure and circulate it in the circuit. Background The refrigerant circuit generally comprises a first heat exchanger ensuring the condensation of the high-pressure refrigerant discharged by the compressor, or the cooling of the fluid in the case of a supercritical state. The refrigerant flows through the first heat exchanger and releases heat to the air stream passing through the heat exchanger. Furthermore, it is also common to cool components of a vehicle driveline by circulating a heat transfer liquid. To this end, the heat transfer liquid receives heat from elements of the drive train and dissipates heat, for example in an air stream, in a second heat exchanger. Integrating the two heat exchangers in a vehicle can be tricky, particularly due to their volume when offset from each other so as to receive the same air flow at the same time. To limit the volume, the two exchangers can also be aligned in the direction of the air flow so that they are continuously passed by the same air flow. However, as air passes through the exchanger located upstream, the heating of the air tends to impair the efficiency of the exchanger located downstream. The present invention aims to propose a solution that is easier to integrate due to being more compact and that provides improved thermodynamic performance. Disclosure of Invention To this end, the invention proposes a heat exchanger for a motor vehicle, comprising: a first heat exchange section configured to allow heat exchange between the refrigerant and the air stream, The first heat exchange section includes a first bundle of tubes forming a set of refrigerant flow channels configured to be disposed in an air stream, A second heat exchange section configured to allow heat exchange between the heat transfer liquid and the air stream, The second heat exchange section includes a second bundle of tubes forming a set of heat transfer liquid flow channels configured to be disposed in an air stream, Wherein the tubes in the first bundle of tubes have a U-shape comprising a first branch and a second branch connected by a base, Wherein the first branch is located upstream of the second branch in the flow direction of the air flow, and Wherein the second bundle of tubes is arranged between the first branch and the second branch of the first bundle of tubes in the flow direction of the air flow. The U-shape of the tubes in the first bundle of tubes makes it possible to increase the length of the heat exchange participating in the first heat exchange section while limiting the front surface area of the exchanger. Since the second heat exchange section is arranged in the free volume formed by the spacing between the branches of each U-shaped tube in the first bundle of tubes, the presence of the second heat exchange section does not change the external volume of the heat exchanger. Thus, the heat exchanger has a very compact shape. Furthermore, for the circulation of the air flow, the first branch of the tube is upstream of the second heat exchange section, which is itself upstream of the second branch of the tube of the first heat exchange section. Thus, each tube or a portion of the tubes receives an air flow having a temperature that is compatible with the temperature of the fluid circulating therein. In other words, the first branch of the first heat exchange section receives a fresh ambient air flow which is not heated by passing through the heat exchanger, which increases its efficiency. The air stream leaving the first branch of the first heat exchange section has a sufficiently low temperature to ensure good exchange efficiency with the second heat exchange section. Also, the air stream heated by passing through the second heat exchange section still has a sufficiently low temperature to ensure good exchange efficiency with the refrigerant flowing in the second branch of the first heat exchange section. Thus, the efficiency of the heat exchanger is optimized for a given volume. Furthermore, thanks to the proposed arrangement, any limitation in terms of the maximum temperature of the heat transfer liquid at the outlet of the second heat exchange section can be fulfilled. The functions listed in the following paragraphs may be implemented independently of each other, as well as in any technic