heat exchanger

Abstract

To make it possible to reduce a space in which devices are installed with respect to a system equipped with a heat exchanger.SOLUTION: A heat exchanger for exchanging heat between a first fluid and a second fluid comprises a cylindrical core extending along an axial direction. The core includes an inner peripheral wall for defining an internal space extending along the axial direction, and an outer peripheral wall arranged on an outer peripheral side of the inner peripheral wall. Between the inner peripheral wall and the outer peripheral wall, at least one peripheral first flow passage extending along the axial direction, and through which the first fluid can flow, and at least one peripheral second flow passage extending along the axial direction, and through which the second fluid can flow are arranged so as to be adjacent to each other in a peripheral direction of the core.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a heat exchanger. [Background Art]

[0002] Patent Document 1 discloses that a heat exchanger that causes heat exchange between a first fluid and a second fluid includes a heat exchange core formed with a first flow passage extending along an axial direction through which the first fluid flows, and a second flow passage extending along the axial direction through which the second fluid flows.

[0003] Patent Document 2 discloses that the heat exchanger includes an inner cylinder that forms a first flow passage through which a first fluid flows and in which a heat recovery member is disposed, and an outer cylinder that forms a second flow passage through which a second fluid flows on a radially outer side of the inner cylinder relative to the first flow passage. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] International Publication No. 2021 / 172320 [Patent Document 2] Japanese Unexamined Patent Publication No. 2021-113655 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] Heat exchangers are sometimes installed in systems where space for equipment installation is limited, such as spacecraft and aircraft. For this reason, it is desirable that the heat exchanger be configured so that the total equipment volume, including the heat exchanger and other equipment, is small. However, in the technology described in Patent Document 1, the heat exchanger is provided independently, and therefore it is not configured to reduce the equipment volume. Furthermore, piping is required to supply the fluid that has undergone heat exchange in the heat exchanger to the target, which may increase the equipment volume. In the technology described in Patent Document 2, other equipment (heat recovery members) is placed in the flow path where heat exchange takes place, so it is necessary to ensure a flow path diameter that is at least large enough to accommodate the heat recovery members, which may increase the volume of the heat exchanger. In addition, if the flow path diameter is large, the heat transfer area will be small, which may decrease the heat exchange efficiency.

[0006] This disclosure has been made in view of the above-mentioned problems and aims to provide a heat exchanger that can reduce the space required for installing the equipment in a system on which the heat exchanger is mounted. [Means for solving the problem]

[0007] To achieve the above objective, the heat exchanger according to the present disclosure is a heat exchanger that performs heat exchange between a first fluid and a second fluid, comprising a cylindrical core extending in the axial direction, the core including an inner circumferential wall defining an internal space extending in the axial direction, and an outer circumferential wall disposed on the outer circumferential side of the inner circumferential wall, wherein at least one circumferential first flow path extending in the axial direction and through which the first fluid can flow, and at least one circumferential second flow path extending in the axial direction and through which the second fluid can flow, are arranged adjacent to each other in the circumferential direction of the core. [Effects of the Invention]

[0008] According to the heat exchanger of this disclosure, the space required for installing the equipment in the system in which the heat exchanger is installed can be reduced. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic perspective view showing the configuration of the heat exchanger according to the first embodiment. [Figure 2] This is a diagram illustrating the configuration of the core according to the first embodiment. [Figure 3] This is a diagram illustrating the configuration of the core according to the first embodiment. [Figure 4A] This diagram schematically shows the configuration of the circumferential first flow channel according to the first embodiment. [Figure 4B] This diagram schematically shows the configuration of the circumferential second flow channel according to the first embodiment. [Figure 5] This is a diagram illustrating the configuration of the core according to the second embodiment. [Figure 6A] This diagram schematically shows the configuration of the circumferential first flow channel according to the second embodiment. [Figure 6B] This figure schematically shows the configuration of the circumferential second flow channel according to the second embodiment. [Figure 7] This is a schematic perspective view showing the configuration of the heat exchanger according to the third embodiment. [Figure 8] This is a diagram illustrating the configuration of a heat exchanger according to the third embodiment. [Figure 9] This is a diagram illustrating the configuration of a heat exchanger according to several embodiments. [Modes for carrying out the invention]

[0010] Hereinafter, a heat exchanger according to an embodiment of the present disclosure will be described with reference to the drawings. Such an embodiment represents one aspect of the present disclosure and is not limiting to this disclosure, and can be modified at will within the scope of the technical idea of ​​the present disclosure.

[0011] <First Embodiment> (composition) The heat exchanger 1 according to the present disclosure performs heat exchange between a first fluid X1 and a second fluid X2. Each of the first fluid X1 and the second fluid X2 may be either a liquid or a gas, and usually the temperatures of the two fluids are different. In the present disclosure, description will be given by taking as an example a case where the first fluid X1 has a lower temperature than the second fluid X2.

[0012] FIG. 1 is a perspective view schematically showing the configuration of a heat exchanger 1A (1) according to the first embodiment. As shown in FIG. 1, the heat exchanger 1A includes a cylindrical core 2 extending along an axial direction D1. In the form illustrated in FIG. 1, the core 2 has a cylindrical shape, and the internal space 3 of the core 2 is open to both sides in the axial direction D1. In some embodiments, the internal space 3 of the core 2 is open only to one side in the axial direction D1.

[0013] FIG. 2 is a view for explaining the configuration of the core 2 according to the first embodiment, and shows the core 2 viewed from a radial direction D2 of the core 2. FIG. 3 is a view for explaining the configuration of the core 2 according to the first embodiment, and shows the core 2 viewed from the axial direction D1. In the present disclosure, the radial direction D2 is a direction orthogonal to the axial direction D1, and starts from an axis O of the core 2.

[0014] As shown in FIG. 2, the core 2 includes an inner circumferential wall 4 that defines the internal space 3 extending along the axial direction D1, and an outer circumferential wall 6 disposed on the outer circumferential side of the inner circumferential wall 4. In the first embodiment, both the inner circumferential wall 4 and the outer circumferential wall 6 have a cylindrical shape, and the outer circumferential wall 6 has a larger diameter than the inner circumferential wall 4. The outer circumferential wall 6 covers the inner circumferential wall 4 from the outside in the radial direction D2. A gap 5 including a first circumferential flow path 8 and a second circumferential flow path 10, which will be described later, is formed between the outer circumferential wall 6 and the inner circumferential wall 4.

[0015] As shown in Figure 3, between the inner peripheral wall 4 and the outer peripheral wall 6 (gap 5), a first circumferential flow passage 8 through which the first fluid X1 can flow and a second circumferential flow passage 10 through which the second fluid X2 can flow are arranged adjacent to each other in the circumferential direction D3 of the core 2. In the first embodiment, each of the first circumferential flow passage 8 and the second circumferential flow passage 10 extends linearly through the gap 5 along the axial direction D1 (see Figures 4A and 4B). Note that the present disclosure only requires that each of the first circumferential flow passage 8 and the second circumferential flow passage 10 extends in any shape along the axial direction D1, and is not limited to linear extension.

[0016] In the first embodiment, as illustrated in Figure 3, the core 2 includes a heat transfer wall 12 that partitions the gap 5 into the first circumferential flow passage 8 and the second circumferential flow passage 10. In the circumferential direction D3, the heat transfer wall 12 is located between the first circumferential flow passage 8 and the second circumferential flow passage 10. In the circumferential direction D3, the first circumferential flow passage 8 is located on the opposite side of the heat transfer wall 12 from the second circumferential flow passage 10. In the radial direction D2, the first circumferential flow passage 8 and the second circumferential flow passage 10 at least partially overlap each other. In the radial direction D2, the first circumferential flow passage 8 and the second circumferential flow passage 10 are at the same position as each other. The distance from the axis O to the first circumferential flow passage 8 and the distance from the axis O to the second circumferential flow passage 10 are the same or substantially the same.

[0017] In the embodiment illustrated in Figure 3, the core 2 includes a plurality of heat transfer walls 12, and the gap 5 includes a plurality of first circumferential flow passages 8 arranged along the circumferential direction D3 and a plurality of second circumferential flow passages 10 arranged along the circumferential direction D3. Each of the plurality of first circumferential flow passages 8 and each of the plurality of second circumferential flow passages 10 are alternately arranged over the entire circumferential direction D3.

[0018] In the embodiment illustrated in Figure 3, the heat transfer wall 12 has a protrusion 13 that protrudes toward either the inside of the first circumferential flow passage 8 or the inside of the second circumferential flow passage 10. Although not shown, in some embodiments, the heat transfer wall 12 has a first protrusion protruding toward the inside of the first circumferential flow passage 8 and a second protrusion protruding toward the inside of the second circumferential flow passage 10.

[0019] Figure 4A is a schematic diagram showing the configuration of the circumferential first flow path 8 according to the first embodiment. In the first embodiment, as illustrated in Figure 4A, the inlet 14 of the circumferential first flow path 8 opens inward in the radial direction D2 on one side of the axial direction D1. The outlet 16 of the circumferential first flow path 8 opens toward the other side of the axial direction D1 on the other side of the axial direction D1. The circumferential first flow path 8 extends linearly parallel to the axial direction D1.

[0020] Figure 4B is a schematic diagram showing the configuration of the circumferential second flow path 10 according to the first embodiment. In the first embodiment, as illustrated in Figure 4B, the inlet 18 of the circumferential second flow path 10 opens inward in the radial direction D2 on the other side of the axial direction D1. The outlet 20 of the circumferential second flow path 10 opens toward one side of the axial direction D1 on one side of the axial direction D1. The circumferential second flow path 10 extends linearly so as to be parallel to the axial direction D1.

[0021] Furthermore, this disclosure is not limited to the embodiments illustrated in Figures 4A and 4B. In some embodiments, the inlet 14 of the circumferential first flow path 8 opens outward in the radial direction D2. In some embodiments, the inlet 18 of the circumferential second flow path 10 opens outward in the radial direction D2. In some embodiments, both the inlet 14 of the circumferential first flow path 8 and the inlet 18 of the circumferential second flow path 10 are located on one side of the axial direction D1, and both the outlet 16 of the circumferential first flow path 8 and the outlet 20 of the circumferential second flow path 10 are located on the other side of the axial direction D1. In other words, the first fluid X1 and the second fluid X2 each flow from one side to the other in the axial direction D1.

[0022] In the first embodiment, core 2 is a structure formed by layering powder material using a 3D printer (not shown). The 3D printer is a three-dimensional additive manufacturing device that creates a three-dimensional object (core 2) based on, for example, 3DCAD (computer-aided design) data or 3DCG (three-dimensional computer graphics) data. This 3D printer is configured, for example, to locally melt the powder with a laser and then sinter it to perform layered manufacturing, and includes a material bucket for storing the powder, a manufacturing stage for forming the structure, and an excess bucket for storing excess powder.

[0023] (Effects / Actions) The operation and effects of the heat exchanger 1A according to the first embodiment will now be described. According to the first embodiment, in the circumferential direction D3, the circumferential first flow path 8 and the circumferential second flow path 10 are adjacent to each other with the heat transfer wall 12 in between. Therefore, heat exchange can be performed between the first fluid X1 flowing through the circumferential first flow path 8 and the second fluid X2 flowing through the circumferential second flow path 10. Furthermore, equipment other than the heat exchanger 1A can be housed in the internal space 3 defined by the inner circumferential wall 4. Therefore, the space required to install the equipment (the total equipment volume of the heat exchanger 1A and other equipment) in a system (such as a spacecraft or aircraft) on which the heat exchanger 1A is mounted can be reduced.

[0024] According to the first embodiment, the second circumferential flow path 10 is arranged on both sides of the first circumferential flow path 8 in the circumferential direction D3, and the first circumferential flow path 8 is arranged on both sides of the second circumferential flow path 10 in the circumferential direction D3. Therefore, the heat exchange efficiency of the heat exchanger 1A can be increased.

[0025] According to the first embodiment, the inside of the circumferential first channel 8 can be inspected through the outlet 16 of the circumferential first channel 8, thus facilitating maintenance of the circumferential first channel 8. Similarly, the inside of the circumferential second channel 10 can be inspected through the outlet 20 of the circumferential second channel 10, thus facilitating maintenance of the circumferential second channel 10. In particular, if the core 2 is a 3D printed object, powder may remain in the circumferential first channel 8 and the circumferential second channel 10, but cleaning of these channels can be made easier.

[0026] According to the first embodiment, since the heat transfer wall 12 has a projection 13, the heat transfer area of ​​the heat transfer wall 12 facing the circumferential first flow path 8 or the heat transfer area of ​​the heat transfer wall 12 facing the circumferential second flow path 10 is increased. As a result, the amount of heat transferred (heat exchange amount) between the first fluid X1 and the second fluid X2 is increased, and the heat exchange efficiency can be improved.

[0027] <Second Embodiment> A heat exchanger 1A according to the second embodiment will now be described. The second embodiment differs from the first embodiment in that the circumferential first flow path 8 includes the radial first flow path 22, and the circumferential second flow path 10 includes the radial second flow path 24. In the second embodiment, components that are the same as those in the first embodiment are given the same reference numerals, and their detailed descriptions are omitted.

[0028] (composition) Figure 5 is a diagram illustrating the configuration of the core 2 according to the second embodiment, showing a magnified view of a part of the core 2 from the axial direction D1. In the second embodiment, as illustrated in Figure 5, the circumferential first flow path 8 includes a plurality of radial first flow paths 22 arranged along the radial direction D2. The circumferential second flow path 10 includes a plurality of radial second flow paths 24 arranged along the radial direction D2.

[0029] Each of the multiple radial first channels 22 overlaps with each other in the circumferential direction D3 by at least a portion. The core 2 includes a first radial partition wall 23 provided between adjacent radial first channels 22, 22 in the radial direction D2. In the second embodiment, the core 2 is a 3D-printed object, and the inner circumferential wall 4, outer circumferential wall 6, heat transfer wall 12 and the first radial partition wall 23 are integrally formed.

[0030] In the embodiment illustrated in Figure 5, the multiple radial first channels 22 include, in order from the inside to the outside of the radial direction D2, a first radial first channel 22A(22), a second radial first channel 22B(22), a third radial first channel 22C(22), a fourth radial first channel 22D(22), and a fifth radial first channel 22E(22). The first radial first channel 22A is located furthest inside the radial direction D2 among the multiple radial first channels 22. The fifth radial first channel 22E is located furthest outside the radial direction D2 among the multiple radial first channels 22.

[0031] Although not shown in Figure 5, the heat transfer wall 12 may have projections 13 that protrude toward at least one of the following: the interior of the first radial first flow path 22A, the interior of the second radial first flow path 22B, the interior of the third radial first flow path 22C, the interior of the fourth radial first flow path 22D, and the interior of the fifth radial first flow path 22E.

[0032] Each of the multiple radial second flow channels 24 overlaps with each other in the circumferential direction D3 by at least a portion. The core 2 includes a second radial partition wall 25 provided between adjacent radial second flow channels 24, 24 in the radial direction D2. The second radial partition wall 25 is integrally formed with the inner circumferential wall 4, the outer circumferential wall 6, the heat transfer wall 12, and the first radial partition wall 23.

[0033] In the embodiment illustrated in Figure 5, the multiple radial second channels 24 include, in order from the inside to the outside of the radial direction D2, a first radial second channel 24A(24), a second radial second channel 24B(24), a third radial second channel 24C(24), a fourth radial second channel 24D(24), and a fifth radial second channel 24E(24). The first radial second channel 24A is located furthest inside the radial direction D2 among the multiple radial second channels 24. The fifth radial second channel 24E is located furthest outside the radial direction D2 among the multiple radial second channels 24.

[0034] Although not shown in Figure 5, the heat transfer wall 12 may have projections 13 that protrude toward at least one of the following: the interior of the first radial second flow path 24A, the interior of the second radial second flow path 24B, the interior of the third radial second flow path 24C, the interior of the fourth radial second flow path 24D, and the interior of the fifth radial second flow path 24E.

[0035] In the second embodiment, as illustrated in Figure 5, each of the multiple radial first flow channels 22 and each of the multiple radial second flow channels 24 are arranged adjacent to each other in the circumferential direction D3. In the radial direction D2, each of the multiple radial first flow channels 22 and each of the multiple radial second flow channels 24 are at the same position.

[0036] Figure 6A is a schematic diagram showing the configuration of one circumferential first flow path 8 according to the second embodiment. In the second embodiment, as illustrated in Figure 6A, the gap 5 between the inner circumferential wall 4 and the outer circumferential wall 6 includes a first branching section 26. The first branching section 26 includes the inlet 14 of the circumferential first flow path 8 and communicates with each of the plurality of radial first flow paths 22. In other words, the first fluid X1 that flows into the first branching section 26 branches and flows through each of the plurality of radial first flow paths 22.

[0037] Figure 6B is a schematic diagram showing the configuration of one circumferential second flow path 10 according to the second embodiment. In the second embodiment, as illustrated in Figure 6B, the gap 5 between the inner circumferential wall 4 and the outer circumferential wall 6 includes a second branching section 28. The second branching section 28 includes the inlet 18 of the circumferential second flow path 10 and communicates with each of the multiple radial second flow paths 24. In other words, the second fluid X2 that flows into the second branching section 28 branches and flows through each of the multiple radial second flow paths 24.

[0038] (Effects / Actions) The operation and effects of the heat exchanger 1A according to the second embodiment will now be described. According to the second embodiment, compared to the case in which there are multiple radial first flow channels 22 and one radial first flow channel 22 with the same flow channel cross-sectional area, the strength of the core 2 can be increased because a first radial partition wall 23 is provided. Similarly, compared to the case in which there are multiple radial second flow channels 24 and one radial second flow channel 24 with the same flow channel cross-sectional area, the strength of the core 2 can be increased because a second radial partition wall 25 is provided.

[0039] According to the second embodiment, the gap 5 of the core 2 includes the first branching portion 26, so that the circumferential first flow path 8 can branch the first fluid X1 into each of the multiple radial first flow paths 22 without interfering with the circumferential second flow path 10. Similarly, the gap 5 of the core 2 includes the second branching portion 28, so that the circumferential second flow path 10 can branch the second fluid X2 into each of the multiple radial second flow paths 24 without interfering with the circumferential first flow path 8.

[0040] If the core 2 has a solid shape with no internal space 3 formed, the difference between the distance between the circumferential first flow path 8 and the circumferential second flow path 10 that are adjacent to each other on the inside of the radial direction D2 (thickness of the heat transfer wall 12 in the circumferential direction D3) and the distance between the circumferential first flow path 8 and the circumferential second flow path 10 that are adjacent to each other on the outside of the radial direction D2 becomes large. As a result, the core 2 may experience a large difference in the amount of heat transferred in the radial direction D2, potentially degrading the performance of the heat exchanger 1. According to the second embodiment, the core 2 has a hollow shape with an internal space 3 formed on the inside of the radial direction D2. As a result, the difference between the distance between the circumferential first flow path 8 and the circumferential second flow path 10 that are adjacent to each other on the inside of the radial direction D2 and the distance between the circumferential first flow path 8 and the circumferential second flow path 10 that are adjacent to each other on the outside of the radial direction D2 can be reduced. As a result, the difference in the amount of heat transferred in the radial direction D2 of the core 2 can be suppressed, and the degradation of the performance of the heat exchanger 1A can be suppressed.

[0041] <Third Embodiment> A heat exchanger 1B according to the third embodiment will now be described. In the third embodiment, the heat exchanger 1B differs from the first and second embodiments in that, in addition to the core 2, it further includes a lid 40, a header 50, a storage tube 60, and an insulating material 80. In the third embodiment, components that are the same as those of the first and second embodiments are denoted by the same reference numerals, and their detailed descriptions are omitted.

[0042] (composition) Figure 7 is a schematic perspective view showing the configuration of the heat exchanger 1B(1) according to the third embodiment. Figure 8 is a diagram illustrating the configuration of the heat exchanger 1B according to the third embodiment. In the third embodiment, as shown in Figures 7 and 8, the heat exchanger 1B includes a core 2, a lid 40, and a header 50. Also, as shown in Figure 8, the heat exchanger 1B includes a storage tube 60 and an insulating material 80.

[0043] In the third embodiment, as illustrated in Figure 8, the core 2 further includes a one-sided wall 30 that covers the internal space 3 from one side in the axial direction D1. This one-sided wall 30 is located on one side in the axial direction D1 than the insertion portion 62 of the storage tube 60, which will be described later. The one-sided wall 30 is integrally formed with the inner circumferential wall 4. The one-sided wall 30 is located on the other side in the axial direction D1 than one end face 4a of the inner circumferential wall 4 on one side in the axial direction D1.

[0044] The internal space 3 of the core 2 opens to the other side in the axial direction D1 (towards the outlet 16 of the circumferential first flow path 8). The lid 40 includes a closing wall 42 that covers the opening 31 of the internal space 3. In the third embodiment, as illustrated in Figure 8, the closing wall 42 has a larger diameter than the opening 31 of the internal space 3. Furthermore, the closing wall 42 is located on the other side in the axial direction D1 than the opening 31 of the internal space 3. The lid 40 further includes a lid wall 44 that extends from the edge of the closing wall 42 along one side in the axial direction D1 and has a concave shape. This lid wall 44 includes one end of the lid 40 on one side in the axial direction D1.

[0045] The lid 40 is connected to the other end 32 of the core 2 on the other side in the axial direction D1. In the third embodiment, the lid wall 44 is configured to be detachably attached to the other end 32 of the core 2. As illustrated in Figures 7 and 8, the core 2 includes a core flange portion 33 extending radially outward in the direction D2 from the other end 32 of the core 2. The lid 40 includes a lid flange portion 46 extending radially outward in the direction D2 from the lid wall 44. The heat exchanger 1B further includes bolts 81 for fastening the core flange portion 33 and the lid flange portion 46.

[0046] The header 50 is connected to one end 34 on one side of the core 2 in the axial direction D1. In the third embodiment, as illustrated in Figure 8, the header 50 includes a first wall 52, a second wall 54, and a header wall 56.

[0047] The first wall 52 forms a first fluid inlet 51 between itself and one side wall 30 of the core 2, which communicates with the inlet 14 of the circumferential first flow path 8. The first wall 52 is located on one side of the axial direction D1 relative to the one side wall 30 of the core 2. The inlet 14 of the circumferential first flow path 8 is formed in the inner circumferential wall 4 and is located on one side of the axial direction D1 relative to the one side wall 30. In the embodiment illustrated in Figure 8, the header 50 includes an inlet pipe 58 connected to the first wall 52 for the flow of the first fluid X1 supplied from outside the heat exchanger 1B into the first fluid inlet 51.

[0048] The second wall 54 forms a second fluid outflow passage 53 between itself and the core 2, which communicates with the outlet 20 of the circumferential second flow path 10. The second wall 54 is located on one side in the axial direction D1 than both the first wall 52 and one end 34 of the core 2. The second wall 54 has a larger diameter than the first wall 52 and covers the first wall 52 from one side in the axial direction D1. In the embodiment illustrated in Figure 8, the header 50 is connected to the second wall 54 and includes an outflow pipe 59 for draining the second fluid X2 from the second fluid outflow passage 53 to the outside of the heat exchanger 1B.

[0049] The header wall 56 extends from the edge of the second wall 54 along the other side in the axial direction D1 and is configured to be detachably attached to one end 34 of the core 2. In the third embodiment, as illustrated in Figures 7 and 8, the core 2 includes a second core flange portion 35 extending radially outward in the direction D2 from one end 34 of the core 2. The header 50 includes a header flange portion 57 extending radially outward in the direction D2 from the header wall 56. The heat exchanger 1B further includes a second bolt 82 for fastening the second core flange portion 35 and the header flange portion 57.

[0050] As illustrated in Figure 8, the storage tube 60 has a storage space 61 formed inside. This storage space 61 is open on both sides in the axial direction D1. In the third embodiment, a structure 100 is placed in the storage space 61 of the storage tube 60. The structure 100 is not particularly limited as long as it utilizes the first fluid X1 which has been heat-exchanged with the second fluid X2. In the third embodiment, the structure 100 is a catalyst 101(100) for removing toxic components from the first fluid X1. In some embodiments, the structure 100 is a combustor, an electric motor, etc.

[0051] The storage tube 60 includes an insertion portion 62 and a flange portion 63. The insertion portion 62 has a cylindrical shape and is inserted into the internal space 3 of the core 2. The insertion portion 62 includes a one-sided opening 64 on one side of the storage space 61 in the axial direction D1. The one-sided opening 64 is located on the other side of the axial direction D1 from the one side wall 30 of the core 2 and opens into the internal space 3 of the core 2. In other words, the internal space 3 of the core 2 includes a folded portion 3a located between the one side wall 30 and the insertion portion 62 in the axial direction D1, through which the detoxified first fluid X13, described later, flows.

[0052] The flange portion 63 has a cylindrical shape with a greater wall thickness than the insertion portion 62 and extends radially outward in the D2 direction from the other end 66 on the other side of the insertion portion 62 in the axial direction D1. The flange portion 63 includes the other side opening 65 on the other side of the storage space 61 in the axial direction D1. The flange portion 63 is connected to the other end 32 of the core 2. The inner surface of the insertion portion 62 and the inner surface of the flange portion 63 are flush with each other. In the third embodiment, the flange portion 63 is connected to the other end of the insertion portion 62 and is located on the other side of the axial direction D1 than the insertion portion 62, but the disclosure is not limited to this embodiment. In some embodiments, the flange portion 63 is located on one side of the axial direction D1 than the other end of the insertion portion 62.

[0053] In the third embodiment, as illustrated in Figure 8, a first fluid outflow passage 70 is formed between the closing wall 42 of the lid 40 and the core 2, communicating with the outlet 16 of the circumferential first flow path 8 and the other side opening 65 of the storage space 61, respectively. In other words, the first fluid X1 flowing out from the circumferential first flow path 8 flows through the first fluid outflow passage 70 and into the storage space 61 of the storage pipe 60. Thus, the internal space 3 of the core 2 is configured to receive the heat-exchanged first fluid X11(1), which is the first fluid X1 that has undergone heat exchange with the second fluid X2, via the storage pipe 60.

[0054] In the third embodiment, as illustrated in Figure 8, the heat exchanger 1B further includes a temperature control device 90 located in the first fluid outlet passage 70. The temperature control device 90 controls the temperature of the heat-exchanged first fluid X11 flowing out from the circumferential first flow path 8. Such a temperature control device 90 may be, for example, a heating device that heats the heat-exchanged first fluid X11 to a preset temperature, or a cooling device that cools the heat-exchanged first fluid X11 to a preset temperature. In the third embodiment, the temperature control device 90 is a heating device that heats the heat-exchanged first fluid X11 to a temperature (e.g., 200 degrees) at which toxic components can be removed by the catalyst 101. The heat-exchanged first fluid X11 heated by the temperature control device 90 flows into the storage space 61 of the storage tube 60 as heated first fluid X12 (X1). The heated first fluid X12 then comes into contact with the catalyst 101 to remove toxic components. The heated first fluid X12, detoxified by the catalyst 101, flows into the folded portion 3a of the internal space 3 of the core 2 as detoxified first fluid X13 (X1).

[0055] In the third embodiment, the temperature control device 90 is detachably attached to the core 2. Although not shown, for example, the temperature control device 90 includes heat transfer tubes and a support plate that supports the heat transfer tubes. The support plate is fitted into a slit formed on the other end face (other end 32) in the axial direction D1 of the core 2. In some embodiments, the temperature control device 90 is detachably attached to the lid 40.

[0056] In the third embodiment, as illustrated in Figure 8, the outer diameter of the insertion portion 62 is smaller than the inner diameter of the inner circumferential wall 4, and a second fluid inflow passage 72 is formed between the inner circumferential wall 4 and the insertion portion 62, extending along the axial direction D1 from one end of the insertion portion 62 on one side of the axial direction D1 to the flange portion 63. The second fluid inflow passage 72 communicates with the folded portion 3a of the internal space 3 of the core 2 and the inlet 18 of the circumferential second flow path 10. The inlet 18 of the circumferential second flow path 10 is formed in the inner circumferential wall 4 and is located on one side of the axial direction D1 than the flange portion 63. The detoxified first fluid X13 that flows into the second fluid inflow passage 72 from the folded portion 3a of the internal space 3 flows through the second fluid inflow passage 72 toward the other side of the axial direction D1. This detoxified first fluid X13 then flows into the circumferential second flow path 10 as the second fluid X2. The heat-exchanged second fluid X21 (X2), which has exchanged heat with the first fluid X1, then flows through the second fluid outlet passage 53 and, as described above, is discharged to the outside of the heat exchanger 1B via the outlet pipe 59.

[0057] The thermal insulation material 80 is provided on the surface 74 of the inner peripheral wall 4 on the side facing the internal space 3, and on the surface 76 of one side wall 30 on the side facing the internal space 3. The thermal insulation material 80 suppresses heat exchange between the detoxified first fluid X13 flowing through the second fluid inlet passage 72 and the first fluid X1 flowing through the circumferential first flow path 8, and also suppresses heat exchange between the detoxified first fluid X13 flowing through the second fluid inlet passage 72 and the second fluid X2 flowing through the circumferential second flow path 10. Furthermore, the thermal insulation material 80 suppresses heat exchange between the detoxified first fluid X13 flowing through the folded portion 3a of the internal space 3 of the core 2 and the first fluid X1 flowing through the first fluid inlet passage 51.

[0058] (Effects / Actions) The operation and effects of the heat exchanger 1B according to the third embodiment will now be described. According to the third embodiment, the heat-exchanged first fluid X11 is configured to flow into the internal space 3 of the core 2, so that equipment requiring temperature control can be housed in the internal space 3. Furthermore, since the internal space 3 is covered by a heat exchange portion including a circumferential first flow path 8 and a circumferential second flow path 10 over the entire circumferential direction D3, heat loss of this equipment can be suppressed. However, this disclosure is not limited to a configuration in which the heat-exchanged first fluid X11 flows into the internal space 3. In some embodiments, the internal space 3 is configured so that the heat-exchanged first fluid X11 does not flow into it.

[0059] According to the third embodiment, since the heat exchanger 1B includes a storage tube 60 that houses the catalyst 101, the core 2 and the storage tube 60 can be made separate from each other, making maintenance of the catalyst 101 easier.

[0060] According to the third embodiment, the core 2 includes one side wall 30, which causes the internal space 3 to include a folded portion 3a, allowing the flow direction of the detoxified first fluid X13 flowing out from the storage tube 60 to be folded back toward the inlet 18 of the circumferential second flow path 10. As a result, the direction in which the first fluid X1 flows through the circumferential first flow path 8 and the direction in which the second fluid X2 flows through the circumferential second flow path 10 are made opposite to each other, thereby increasing the heat exchange efficiency of the heat exchanger 1B.

[0061] According to the third embodiment, since the heat exchanger 1B includes an insulating material 80, heat exchange between the first fluid X1 and the second fluid X2 and the detoxified first fluid X13 is suppressed. Therefore, a decrease in the heat exchange efficiency of the heat exchanger 1B can be suppressed.

[0062] According to the third embodiment, the heat exchanger 1B includes a lid 40, and a first fluid outlet passage 70 is formed between the closing wall 42 of the lid 40 and the core 2. This allows the heat-exchanged first fluid X12 to flow into the storage space 61. Furthermore, since the heat exchanger 1B includes a temperature control device 90 located in the first fluid outlet passage 70, the heat-exchanged first fluid X11 can be adjusted to a temperature at which toxic components can be removed by the catalyst 101 before flowing into the storage space 61. In addition, since the temperature control device 90 is detachably attached to the core 2, the maintainability of the temperature control device 90 can be improved.

[0063] According to the third embodiment, the core flange portion 33 and the lid flange portion 46 are fastened together by bolts 81, thereby improving the airtightness of the internal space 3 of the core 2, the circumferential first flow path 8, and the circumferential second flow path 10.

[0064] According to the third embodiment, the heat exchanger 1B includes a header 50, a first fluid inlet passage 51 is formed between the first wall 52 of the header 50 and one side wall 30 of the core 2, and a second fluid outlet passage 53 is formed between the second wall 54 of the header 50 and the core 2. Therefore, the first fluid X1 can be introduced into the circumferential first flow path 8, and the heat-exchanged second fluid X21 can be discharged from the circumferential second flow path 10.

[0065] Figure 9 is a diagram illustrating the configuration of a heat exchanger 1B according to several embodiments. In some embodiments, as illustrated in Figure 9, the heat exchanger 1B includes a first support member 92 that supports the flange portion 63 against the inner circumferential wall 4, and a second support member 94 that supports one end 93 on one side of the insertion portion 62 in the axial direction D1 against one side wall 30.

[0066] In the embodiment illustrated in Figure 9, one end 93 of the insertion portion 62 is the portion of the insertion portion 62 that includes the one-sided opening 64. The first support member 92 has, for example, a ring shape and is attached to the surface 74 of the inner circumferential wall 4. This first support member 92 has the function of pressing the flange portion 63 from the outside in the radial direction D2. The second support member 94 has, for example, a cylindrical shape and extends from the surface 76 of one side wall 30 along the other side in the axial direction D1. The inner diameter of the second support member 94 is approximately the same as the outer diameter of the insertion portion 62, and one end 93 of the insertion portion 62 is fitted into the second support member 94. The second support member 94 is configured to allow the detoxified first fluid X13 to flow into the second fluid inflow passage 72.

[0067] As illustrated and explained in Figure 9, the provision of the first support member 92 can suppress the detachment of the storage tube 60 from the core 2. Furthermore, the provision of the second support member 94, compared to the case where only the first support member 92 is provided, means that both the flange portion 63 and one end 93 of the insertion portion 62 of the storage tube 60 are supported by the core 2. This further suppresses vibration of the storage tube 60 and stress concentration in the storage tube 60, thereby increasing the durability of the heat exchanger 1B.

[0068] The contents described in each of the above embodiments can be understood, for example, as follows:

[0069] [1] The heat exchanger (1) relating to this disclosure is A heat exchanger that performs heat exchange between a first fluid (X1) and a second fluid (X2), It comprises a cylindrical core (2) extending along the axial direction (D1), The aforementioned core is An inner circumferential wall (4) defines the internal space (3) that extends along the axial direction, The outer peripheral wall (6) is located on the outer peripheral side of the inner peripheral wall, Between the inner circumferential wall and the outer circumferential wall, at least one circumferential first flow path (8) extending along the axial direction and through which the first fluid can flow, and at least one circumferential second flow path (10) extending along the axial direction and through which the second fluid can flow, are arranged adjacent to each other in the circumferential direction (D3) of the core.

[0070] According to the configuration described in [1] above, heat exchange can be performed between a first fluid flowing through a first circumferential channel and a second fluid flowing through a second circumferential channel. Furthermore, equipment other than the heat exchanger can be housed in the internal space defined by the inner circumferential wall. This reduces the space required for installing equipment in a system on which the heat exchanger is mounted.

[0071] [2] In some embodiments, in the configuration described in [1] above, The at least one circumferential first flow path includes a plurality of circumferential first flow paths arranged along the circumferential direction, The at least one circumferential second flow path includes a plurality of circumferential second flow paths arranged along the circumferential direction, Each of the plurality of circumferential first flow channels and each of the plurality of circumferential second flow channels are arranged alternately in the circumferential direction.

[0072] According to the configuration described in [2] above, a second circumferential flow path is arranged on both sides of the first circumferential flow path in the circumferential direction, and a first circumferential flow path is arranged on both sides of the second circumferential flow path in the circumferential direction. This makes it possible to increase the heat exchange efficiency of the heat exchanger.

[0073] [3] In some embodiments, in the configuration described in [1] or [2] above, The at least one circumferential first channel includes a plurality of radial first channels (22) arranged along the radial direction (D2) of the core, The at least one circumferential second flow path includes a plurality of radial second flow paths (24) arranged along the radial direction, Each of the plurality of radial first channels and each of the plurality of radial second channels are arranged to be adjacent to each other in the circumferential direction.

[0074] The configuration described in [3] above can increase the strength of the core compared to the case in which multiple radial first channels and one radial first channel having equal channel cross-sectional area are included. Similarly, the strength of the core can increase compared to the case in which multiple radial second channels and one radial second channel having equal channel cross-sectional area are included.

[0075] [4] In some embodiments, in the configuration described in any one of [1] to [3] above, Each of the at least one circumferential first channel and the at least one circumferential second channel extends linearly along the axial direction between the inner circumferential wall and the outer circumferential wall, The inlet (14) of the at least one circumferential first channel opens radially to the core on one side in the axial direction, The outlet (16) of the at least one circumferential first flow path opens in the axial direction on the other side in the axial direction, The inlet (18) of the at least one circumferential second flow path opens radially on the other side in the axial direction, The outlet (20) of the at least one circumferential second flow path is open in the axial direction on one side in the axial direction.

[0076] According to the configuration described in [4] above, the inside of the circumferential first channel can be inspected through the outlet of the circumferential first channel, thus facilitating maintenance of the circumferential first channel. Similarly, the inside of the circumferential second channel can be inspected through the outlet of the circumferential second channel, thus facilitating maintenance of the circumferential second channel.

[0077] [5] In some embodiments, in the configuration described in any one of [1] to [4] above, The internal space of the core is configured to receive the heat-exchanged first fluid (X11), which is the first fluid that has undergone heat exchange with the second fluid.

[0078] According to the configuration described in [5] above, equipment requiring temperature control can be housed in the internal space. Furthermore, since the internal space is covered with a heat exchange section including a first circumferential flow path and a second circumferential flow path, heat loss of the equipment can be suppressed.

[0079] [6] In some embodiments, in the configuration described in any one of [1] to [5] above, The storage tube (60) further comprises a storage space (61) formed inside which both sides are open, The aforementioned storage tube is An insertion portion (62) is inserted into the internal space of the core and includes a one-sided opening (64) on one side of the storage space, The device includes a flange portion (63) that extends radially outward from the other end of the insertion portion on the other axial side and includes the other side opening (65) on the other side of the storage space.

[0080] According to the configuration described in [6] above, the core and the containment tube that houses equipment other than the heat exchanger are made separate from each other, making it possible to facilitate maintenance of the equipment inside the containment tube.

[0081] [7] In some embodiments, in the configuration described in [6] above, The core further includes a side wall (30) that covers the internal space of the core from one side in the axial direction and is located on one side in the axial direction of the insertion portion of the storage tube, Between the inner circumferential wall and the insertion portion, a second fluid inflow passage (72) is formed that extends along the axial direction to the flange portion and communicates with the inlet of the at least one circumferential second flow path.

[0082] According to the configuration described in [7] above, the direction in which the first fluid flows is opposite to the direction in which the second fluid flows, thereby increasing the heat exchange efficiency.

[0083] [8] In some embodiments, in the configuration described in [7] above, The system further includes an insulating material (80) provided on the inner peripheral wall's surface (74) facing the internal space, and on the one side wall's surface (76) facing the internal space.

[0084] According to the configuration described in [8] above, the first fluid flowing through the first circumferential channel and the second fluid flowing through the second circumferential channel are prevented from exchanging heat with the fluid flowing from one side opening of the insertion portion to the inlet of the second circumferential channel, thereby suppressing a decrease in heat exchange efficiency.

[0085] [9] In some embodiments, in the configuration described in any one of [6] to [8] above, The system further includes a first support member (92) that supports the flange portion against the inner circumferential wall.

[0086] According to the configuration described in [9] above, the detachment of the storage tube from the core can be suppressed.

[0087]

[10] In some embodiments, in the configuration described in [9] above, The device further includes a second support member (94) that supports one end (93) of the insertion portion on one side in the axial direction against the one side wall.

[0088] According to the configuration described in

[10] above, compared to the configuration described in [9] above, both the flange portion and one end of the insertion portion of the storage tube are supported by the core, which further suppresses vibration of the storage tube and further suppresses stress concentration in the storage tube, thereby increasing the durability of the heat exchanger.

[0089]

[11] In some embodiments, in the configuration described in any one of [6] to

[10] above, The internal space of the core opens to the outlet side of the at least one circumferential first flow path in the axial direction, The core further includes a lid (40) which includes a closing wall (42) that covers the opening of the internal space and is connected to the other end (32) on the other side in the axial direction of the core, A first fluid outflow passage (70) is formed between the blocking wall and the core, communicating with the outlet of the at least one circumferential first flow path and the other side opening of the storage space.

[0090] According to the configuration described in

[11] above, the first fluid that has undergone heat exchange with the second fluid (heat-exchanged first fluid) can be introduced into the storage space.

[0091]

[12] In some embodiments, in the configuration described in

[11] above, The system further includes a temperature control device (90) located in the first fluid outflow passage for controlling the temperature of the first fluid discharged from the at least one circumferential first flow path.

[0092] According to the configuration described in

[12] above, the temperature of the heat-exchanged first fluid can be adjusted to any temperature before being introduced into the storage space.

[0093]

[13] In some embodiments, in the configuration described in

[13] above, The temperature control device is detachably attached to the core or the lid.

[0094] The configuration described in

[13] above can improve the maintainability of the temperature control device.

[0095]

[14] In some embodiments, in the configuration described in any one of

[11] to

[13] above, The core includes a core flange portion (33) extending radially outward from the other end of the core, The lid includes a lid flange portion (46) extending radially outward from one end (44) on one side of the lid in the axial direction, The system further includes a bolt (81) for fastening the core flange portion and the cover flange portion.

[0096] According to the configuration described in

[14] above, the airtightness of the internal space of the core, the first circumferential flow path, and the second circumferential flow path can be improved by attaching the lid to the core by bolt fastening.

[0097]

[15] In some embodiments, in the configuration described in any one of [7] to

[14] above, The core further comprises a header (50) connected to one end (34) on one side in the axial direction, The header includes a first wall (52) that forms a first fluid inlet passage (51) between itself and the one side wall, which communicates with the inlet of the at least one circumferential first flow path.

[0098] According to the configuration described in

[15] above, the first fluid can be introduced into the circumferential first flow path.

[0099]

[16] In some embodiments, in the configuration described in

[15] above, The header includes a second wall (54) that forms a second fluid outflow passage (53) between itself and the core, which communicates with the outlet of the at least one circumferential second flow path.

[0100] According to the configuration described in

[16] above, the second fluid can be discharged from the first circumferential flow path.

[0101]

[17] In some embodiments, in the configuration described in any one of [1] to

[16] above, The core includes a heat transfer wall (12) that divides the space between the inner circumferential wall and the outer circumferential wall into the first circumferential flow path and the second circumferential flow path. The heat transfer wall has a projection (13) that protrudes toward the interior of the first circumferential flow path or toward the interior of the second circumferential flow path.

[0102] According to the configuration described in

[17] above, the heat transfer area of ​​the heat transfer wall facing the first circumferential flow path, or the heat transfer area of ​​the heat transfer wall facing the second circumferential flow path, is increased, thereby increasing the amount of heat transferred (heat exchange) between the first fluid and the second fluid. Therefore, the heat exchange efficiency can be increased. [Explanation of Symbols]

[0103] 1 heat exchanger 2 cores 3. Interior space 4 Inner wall 5 gaps 6 Outer wall 8. First flow channel in the circumferential direction 10 Circumferential second channel 12 Heat transfer wall 13 protrusions 14 Inlet of the first circumferential channel 16. Outlet of the first circumferential channel 18 Inlet of the second circumferential channel 20 Outlet of the second flow channel in the circumferential direction 22 Radial first channel 23 First radial partition wall 24 Radial second channel 25 Second radial partition wall 26. First branching point 28 Second Branch 30 One side wall 31 Openings in the interior space 32 Other end of the core 33 Core flange section 34 One end of the core 35 Second core flange section 40 Lid 42 Blocking wall 44 Lid wall 46 Cover flange section 50 headers 51 1st fluid inflow path 52 1st wall 53 2nd fluid outflow path 54 Second wall 56 Header Wall 57 Header flange section 58 Inflow pipe 59 Outflow pipe 60 Containment tube 61 Storage space 62 Insertion section 63 Flange section 64 One-sided opening 66 Other end of the insertion part 65 Other side opening 70 First fluid outflow path 72 Second fluid inflow path 74 Surface of the inner circumferential wall 76 Surface of one side wall 80 Insulation 81 volts 82 Second bolt 90 Temperature control device 92 First support member 93 One end of the insertion part 94 Second support member 100 structures 101 Catalyst D1 Axial direction D2 radial direction D3 Circumferential direction O axis X1 1st fluid X11 Heat-exchanged first fluid X12 Heated 1st fluid X13 Detoxified 1st fluid X2 2nd fluid X21 Heat-exchanged second fluid

Claims

1. A heat exchanger that performs heat exchange between a first fluid and a second fluid, It has a cylindrical core that extends along the axial direction, The aforementioned core is An inner circumferential wall defining the internal space extending along the axial direction, The outer peripheral wall is located on the outer peripheral side of the inner peripheral wall, Between the inner circumferential wall and the outer circumferential wall, at least one circumferential first flow path extending along the axial direction and through which the first fluid can flow, and at least one circumferential second flow path extending along the axial direction and through which the second fluid can flow, are arranged adjacent to each other in the circumferential direction of the core. The internal space of the core is configured such that a heat-exchanged first fluid, which is the first fluid that has undergone heat exchange with the second fluid, flows into it. heat exchanger.

2. The at least one circumferential first flow path includes a plurality of circumferential first flow paths arranged along the circumferential direction, The at least one circumferential second flow path includes a plurality of circumferential second flow paths arranged along the circumferential direction, Each of the plurality of circumferential first channels and each of the plurality of circumferential second channels are arranged alternately in the circumferential direction. The heat exchanger according to claim 1.

3. The at least one circumferential first channel includes a plurality of radial first channels arranged along the radial direction of the core, The at least one circumferential second flow path includes a plurality of radial second flow paths arranged along the radial direction, Each of the plurality of radial first channels and each of the plurality of radial second channels are arranged to be adjacent to each other in the circumferential direction. A heat exchanger according to claim 1 or 2.

4. Each of the at least one circumferential first channel and the at least one circumferential second channel extends linearly along the axial direction between the inner circumferential wall and the outer circumferential wall, The inlet of the at least one circumferential first channel opens radially to the core on one side in the axial direction, The outlet of the at least one circumferential first flow path opens in the axial direction on the other side in the axial direction, The inlet of the at least one circumferential second flow path opens radially on the other side in the axial direction, The outlet of the at least one circumferential second flow path is open in the axial direction on one side in the axial direction. A heat exchanger according to claim 1 or 2.

5. It further includes a storage tube in which a storage space is formed inside with openings on both sides, The aforementioned storage tube is An insertion portion is inserted into the internal space of the core and includes an opening on one side of the storage space, A flange portion extending radially outward from the other end of the insertion portion on the other axial side, including the other side opening on the other side of the storage space, A heat exchanger according to claim 1 or 2.

6. A heat exchanger that performs heat exchange between a first fluid and a second fluid, It has a cylindrical core that extends along the axial direction, The aforementioned core is An inner circumferential wall defining the internal space extending along the axial direction, The outer peripheral wall is located on the outer peripheral side of the inner peripheral wall, Between the inner circumferential wall and the outer circumferential wall, at least one circumferential first flow path extending along the axial direction and through which the first fluid can flow, and at least one circumferential second flow path extending along the axial direction and through which the second fluid can flow, are arranged adjacent to each other in the circumferential direction of the core. It further includes a storage tube in which a storage space is formed inside with openings on both sides, The aforementioned storage tube is An insertion portion is inserted into the internal space of the core and includes an opening on one side of the storage space, A flange portion extending radially outward from the other end of the insertion portion on the other axial side, including the other side opening on the other side of the storage space, heat exchanger.

7. The core further includes a side wall that covers the internal space of the core from one side in the axial direction and is located on one side in the axial direction of the insertion portion of the storage tube, Between the inner circumferential wall and the insertion portion, a second fluid inflow passage is formed that extends along the axial direction to the flange portion and communicates with the inlet of the at least one circumferential second flow path. The heat exchanger according to claim 6.

8. The system further comprises insulating material provided on the surface of the inner peripheral wall facing the internal space, and on the surface of the one side wall facing the internal space. The heat exchanger according to claim 7.

9. The system further includes a first support member that supports the flange portion against the inner circumferential wall. The heat exchanger according to claim 6.

10. The system further includes a second support member that supports one end of the insertion portion on one side in the axial direction against the one side wall. The heat exchanger according to claim 9.

11. The internal space of the core opens to the outlet side of the at least one circumferential first flow path in the axial direction, The core further comprises a lid that includes a closing wall covering the opening of the internal space and is connected to the other end of the core on the other side in the axial direction, Between the blocking wall and the core, a first fluid outflow passage is formed that communicates with the outlet of the at least one circumferential first flow path and the other side opening of the storage space. The heat exchanger according to claim 6.

12. The system further comprises a temperature control device arranged in the first fluid outflow passage for controlling the temperature of the first fluid discharged from the at least one circumferential first flow path, The heat exchanger according to claim 11.

13. The temperature control device is detachably attached to the core or the lid. The heat exchanger according to claim 12.

14. The core includes a core flange portion extending radially outward from the other end of the core, The lid includes a lid flange portion extending radially outward from one end of the lid on one side in the axial direction, The system further comprises bolts for fastening the core flange portion and the cover flange portion. The heat exchanger according to claim 11.

15. The core further comprises a header connected to one end on one side in the axial direction, The header includes a first wall that forms a first fluid inlet passage communicating with the inlet of the at least one circumferential first flow path between itself and the one side wall, The heat exchanger according to claim 7.

16. The header includes a second wall that forms a second fluid outflow passage communicating with the outlet of the at least one circumferential second flow path between it and the core. The heat exchanger according to claim 15.

17. The core includes a heat transfer wall that divides the space between the inner circumferential wall and the outer circumferential wall into the first circumferential flow path and the second circumferential flow path. The heat transfer wall has a projection that protrudes toward the interior of the first circumferential channel or toward the interior of the second circumferential channel. A heat exchanger according to claim 1 or 6.

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