Heat exchange member, heat exchanger and heat conductive member

Abstract

To provide a heat exchange member capable of improving heat recovery efficiency and suppressing increase in pressure loss.SOLUTION: A heat exchange member 100 comprises: a honeycomb structure 10 that has an outer peripheral wall 11, an inner peripheral wall 12, and a partition wall 13 disposed between the outer peripheral wall 11 and the inner peripheral wall 12 and partitioning and forming a plurality of cells 16 serving as a flow path for first fluid extending from a first end surface 14 to a second end surface 15; and a covering member 20 covering the outer peripheral surface of the outer peripheral wall 11. In a cross section of the honeycomb structure 10 orthogonal to the direction of the flow path for the first fluid, the partition walls 13 extend radially. Each cell 16 is formed of the outer peripheral wall 11, the inner peripheral wall 12 and the partition wall 13.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a heat exchange member, a heat exchanger, and a heat conduction member. [Background technology]

[0002] In recent years, there has been a demand for improved fuel economy in automobiles. In particular, to prevent a deterioration in fuel economy when the engine is cold, such as when the engine is started, there are hopes for a system that can quickly warm the coolant, engine oil, automatic transmission fluid (ATF), etc., thereby reducing friction loss. There are also hopes for a system that can heat the exhaust gas purification catalyst in order to quickly activate the catalyst.

[0003] An example of such a system is a heat exchanger. A heat exchanger is a device that exchanges heat between a first fluid and a second fluid by circulating a first fluid inside the heat exchanger and a second fluid outside the heat exchanger. In such a heat exchanger, heat is exchanged from a high-temperature fluid (e.g., exhaust gas) to a low-temperature fluid (e.g., cooling water), making it possible to effectively utilize heat.

[0004] As a heat exchanger for recovering heat from high-temperature gas such as exhaust gas from an automobile, a heat exchanger using a heat exchange member having a honeycomb structure has been proposed. Also, a heat exchange member having a hollow honeycomb structure having a hollow region that functions as a bypass path for exhaust gas has been proposed. For example, Patent Document 1 proposes a heat exchange element comprising a hollow honeycomb structure having partition walls, inner walls and outer walls that define cells that penetrate from a first end face to a second end face and serve as a flow path for a first fluid, and a covering member that covers the outer wall of the honeycomb structure, in which the cells are arranged radially in a cross section of the honeycomb structure perpendicular to the flow path direction of the first fluid, and the thickness of the inner walls and outer walls is greater than the thickness of the partition walls. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2019 / 135312 Summary of the Invention [Problem to be solved by the invention]

[0006] As a result of studies by the present inventors, it has been found that the heat exchange element described in Patent Document 1 has room for improvement in terms of achieving both an improvement in heat recovery efficiency and suppression of an increase in pressure loss.

[0007] The present invention has been made to solve the above problems, and provides a heat exchange element and a heat exchanger capable of improving heat recovery efficiency while suppressing an increase in pressure loss. The present invention also provides a heat conductive member that can be mounted on the heat exchange element and the heat exchanger. [Means for solving the problem]

[0008] The above problems are solved by the present invention, which is specified as follows:

[0009] The present invention relates to a honeycomb structure having an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall, which partition walls define a plurality of cells that serve as a flow path for a first fluid and extend from a first end surface to a second end surface; A covering member that covers an outer peripheral surface of the outer peripheral wall; Equipped with In a cross section of the honeycomb structure perpendicular to a flow path direction of the first fluid, the partition walls extend in a radial direction, Each of the cells is formed by the outer peripheral wall, the inner peripheral wall, and the partition wall. And, Except for the case where the inside of the cell and the inner peripheral side of the inner peripheral wall are filled with porous ceramics, It is a heat exchange member.

[0010] The present invention also relates to a honeycomb structure having an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall, the partition walls defining a plurality of cells that serve as a flow path for a first fluid extending from a first end face to a second end face; A covering member that covers an outer peripheral surface of the outer peripheral wall; Equipped with In a cross section of the honeycomb structure perpendicular to the flow path direction of the first fluid, the partition walls include partition walls extending in a radial direction, and the ratio of the number of partition walls extending in the radial direction to the outer diameter (mm) of the honeycomb structure is 3.2 ~6 pieces / mm It is a heat exchange member.

[0011] The present invention also relates to a heat exchange member, an outer cylinder arranged radially outwardly of the covering member at a distance therefrom so that a second fluid can flow around the outer periphery of the covering member; It is a heat exchanger comprising:

[0012] The present invention also provides a heat transfer member including a honeycomb structure having an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall, partitioning and forming a plurality of cells that serve as a flow path for a first fluid extending from a first end face to a second end face, The outer peripheral wall, the inner peripheral wall and the partition wall are made of a Si-SiC material mainly containing SiC particles as an aggregate and containing metal Si between the SiC particles, In a cross section of the honeycomb structure perpendicular to a flow path direction of the first fluid, the partition walls extend in a radial direction, Each of the cells is formed by the outer peripheral wall, the inner peripheral wall, and the partition wall. And, Except for the case where the inside of the cell and the inner peripheral side of the inner peripheral wall are filled with porous ceramics, It is a thermally conductive member.

[0013] Furthermore, the present invention provides a heat transfer member including a honeycomb structure having an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall, partitioning and forming a plurality of cells that serve as a flow path for a first fluid extending from a first end face to a second end face, The outer peripheral wall, the inner peripheral wall and the partition wall are made of a Si-SiC material mainly containing SiC particles as an aggregate and containing metal Si between the SiC particles, In a cross section of the honeycomb structure perpendicular to the flow path direction of the first fluid, the partition walls include partition walls extending in a radial direction, and the ratio of the number of partition walls extending in the radial direction to the outer diameter (mm) of the honeycomb structure is 3.2 ~6 pieces / mm It is a thermal conductive member. Effect of the Invention

[0014] According to the present invention, it is possible to provide a heat exchange element and a heat exchanger capable of improving heat recovery efficiency while suppressing an increase in pressure loss. Also, according to the present invention, it is possible to provide a heat conductive member that can be mounted on the heat exchange element and the heat exchanger. [Brief description of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view parallel to the axial direction of a honeycomb structure of a heat exchanger element according to a first embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view taken along line aa' of the heat exchange member shown in FIG. [Diagram 3] 3 is a partial enlarged view of a honeycomb structure constituting the heat exchange member shown in FIG. 2. [Figure 4] 1 is a cross-sectional view parallel to a flow path direction of a first fluid in a honeycomb structure of a heat exchanger according to a first embodiment of the present invention. [Diagram 5] 5 is a cross-sectional view taken along line bb' of the heat exchanger shown in FIG. [Figure 6] FIG. 4 is a cross-sectional view parallel to the axial direction of a honeycomb structure of a heat exchanger element according to a second embodiment of the present invention. [Figure 7] 7 is a cross-sectional view of the heat exchanger member shown in FIG. 6 taken along line cc'. [Figure 8] 8 is a partial enlarged view of a honeycomb structure constituting the heat exchanger member shown in FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments, and it should be understood that modifications and improvements to the following embodiments, which are made based on the ordinary knowledge of a person skilled in the art, fall within the scope of the present invention, without departing from the spirit of the present invention.

[0017] The present inventors have investigated the problem of further improving the heat recovery efficiency of Patent Document 1, and have found the following. In the cross section of the honeycomb structure perpendicular to the flow direction of the first fluid, the hollow honeycomb structure described in Patent Document 1 has a second partition wall extending in the circumferential direction and a first partition wall intersecting with the second partition wall. The first partition wall has a role of transmitting the heat of the first fluid flowing in the cells to the outer peripheral wall of the honeycomb structure and smoothly exchanging heat with the second fluid flowing outside the covering member covering the outer peripheral wall, but it has been found that the second partition wall does not contribute much to this role and is a factor of increasing pressure loss. In addition, if there are many second partition walls, the opening area of ​​the cell decreases, so the flow rate of the first fluid flowing in the cell increases. As a result, the first fluid passes through the honeycomb structure before the heat of the first fluid is sufficiently recovered, which may reduce the heat recovery efficiency, and it has been found that there is room for improvement.

[0018] <Embodiment 1> (1) Heat exchange and heat conduction components Fig. 1 is a cross-sectional view parallel to the axial direction of the honeycomb structure of the heat exchanger element according to the first embodiment of the present invention. Fig. 2 is a cross-sectional view of the heat exchanger element shown in Fig. 1 taken along line a-a', that is, a cross-sectional view perpendicular to the flow path direction (axial direction) of the first fluid of the honeycomb structure of the heat exchanger element according to the first embodiment of the present invention. Fig. 3 is a partial enlarged view of the honeycomb structure constituting the heat exchanger element shown in Fig. 2.

[0019] The heat exchange member 100 according to the first embodiment of the present invention includes a honeycomb structure 10 having an outer peripheral wall 11, an inner peripheral wall 12, partition walls 13 disposed between the outer peripheral wall 11 and the inner peripheral wall 12 and partitioning a plurality of cells 16 that serve as a flow path for a first fluid extending from a first end face 14 to a second end face 15, and a covering member 20 that covers the outer peripheral surface of the outer peripheral wall 11. In the heat exchange member 100 having such a structure, heat exchange between the first fluid that can flow in the cells 16 and the second fluid that can flow around the outer periphery of the covering member 20 is performed through the outer peripheral wall 11 of the honeycomb structure 10 and the covering member 20. In FIG. 1, the first fluid can flow in either the left or right direction on the paper. The first fluid is not particularly limited, and various liquids or gases can be used. For example, when the heat exchange member 100 is used in a heat exchanger mounted on an automobile, the first fluid is preferably exhaust gas.

[0020] Moreover, among the components of the heat exchange member 100 according to the first embodiment of the present invention, those excluding the covering member 20 are referred to as a heat conductive member. That is, the heat conductive member according to the first embodiment of the present invention includes a honeycomb structure 10 having an outer peripheral wall 11, an inner peripheral wall 12, and partition walls 13 disposed between the outer peripheral wall 11 and the inner peripheral wall 12 and defining a plurality of cells 16 that serve as flow paths for a first fluid extending from a first end face 14 to a second end face 15.

[0021] The partition walls 13 (13a) constituting the honeycomb structure 10 extend in the radial direction (diameter direction) in a cross section of the honeycomb structure 10 perpendicular to the flow path direction of the first fluid (i.e., the cross section shown in FIG. 2). With this structure, the heat of the first fluid can be transferred in the radial direction via the partition walls 13a, and therefore the heat of the first fluid can be efficiently transferred to the outside of the honeycomb structure 10.

[0022] Each of the plurality of cells 16, which are the flow paths of the first fluid, is formed from an outer peripheral wall 11, an inner peripheral wall 12, and partition walls 13a extending in the radial direction. That is, the plurality of cells 16 do not have partition walls 13 extending in the circumferential direction in the cross section of the honeycomb structure 10 perpendicular to the flow path direction of the first fluid. As described above, the partition walls 13 extending in the circumferential direction do not contribute much to the heat exchange between the first fluid and the second fluid, and are a factor in increasing the pressure loss. In addition, if there are many partition walls 13 extending in the circumferential direction, the opening area of ​​the cells 16 decreases, so that the flow rate of the first fluid flowing through the cells 16 increases. As a result, the first fluid passes through the honeycomb structure 10 before the heat of the first fluid is sufficiently recovered, and the heat recovery efficiency decreases. Therefore, by forming each of the plurality of cells 16 from the outer peripheral wall 11, the inner peripheral wall 12, and the partition walls 13a extending in the radial direction, it is possible to achieve both improvement of the heat recovery efficiency and suppression of the increase in pressure loss.

[0023] The number of partition walls 13a extending in the radial direction can be appropriately set depending on the size of the honeycomb structure 10 and the like. For example, in a cross section of the honeycomb structure 10 perpendicular to the flow direction of the first fluid, the ratio (N / D1) of the number N (pieces) of partition walls 13 to the outer diameter D1 (mm) of the honeycomb structure 10 is preferably 2.3 pieces / mm or more, more preferably 3.2 pieces / mm or more, and even more preferably 4 pieces / mm or more. With this configuration, it is possible to improve the heat recovery efficiency and suppress an increase in pressure loss while ensuring the mechanical strength of the honeycomb structure 10. The upper limit of the ratio (N / D1) is not particularly limited, but is generally 6 pieces / mm or less.

[0024] In a cross section of the honeycomb structure 10 perpendicular to the flow direction of the first fluid, the aspect ratio of the cells 16 is not particularly limited, but is preferably at least 3, and more preferably at least 5. By controlling the aspect ratio within such a range, it becomes possible to stably achieve both improvement in heat recovery efficiency and suppression of an increase in pressure loss. Here, the aspect ratio of the cell 16 means the ratio (L2 / L1) of the length L2 of the partition wall 13 (13a) to the length L1 of the inner circumferential wall 12 constituting one cell 16. The upper limit of the aspect ratio of the cells 16 is not particularly limited, but is generally 30 or less.

[0025] In a typical embodiment, the number of partition walls 13a extending in the radial direction is 200 to 500, and preferably 300 to 500. The length L2 of the partition walls 13a extending in the radial direction is 1.7 to 20 mm. The length L1 of the inner peripheral wall 12 constituting one cell 16 is 0.1 to 2 mm. With this configuration, it is possible to improve the heat recovery efficiency while suppressing an increase in pressure loss.

[0026] The shape (outer shape) of the honeycomb structure 10 is not particularly limited and may be, for example, a circular cylinder, an elliptical cylinder, a rectangular cylinder, or other polygonal cylinders. Therefore, the outer shape of the honeycomb structure 10 in the cross section of Fig. 2 (i.e., the outer shape of the outer peripheral wall 11) may be a circle, an ellipse, a rectangle, or other polygonal shape. The shape of the hollow portion in the honeycomb structure 10 is not particularly limited, and may be, for example, a circular cylinder, an elliptical cylinder, a rectangular cylinder, or other polygonal cylinder. Therefore, the shape of the hollow portion in the cross section of Fig. 2 (i.e., the inner shape of the inner peripheral wall 12) may be a circle, an ellipse, a rectangle, or other polygonal shape. The shape of the honeycomb structure 10 and the shape of the hollow portion may be the same or different, but from the viewpoint of resistance to external impacts, thermal stress, and the like, it is preferable that they are the same.

[0027] The thickness of the outer peripheral wall 11 and the inner peripheral wall 12 is preferably greater than the thickness of the partition wall 13. This configuration can increase the strength of the outer peripheral wall 11 and the inner peripheral wall 12, which are prone to destruction (e.g., cracks, fractures, etc.) due to external impact, thermal stress caused by the temperature difference between the first fluid and the second fluid, and the like. The thicknesses of the outer peripheral wall 11, the inner peripheral wall 12, and the partition walls 13 can be appropriately adjusted depending on the application. For example, when the heat exchange member 100 and the heat conductive member are used for general heat exchange applications, the thicknesses of the outer peripheral wall 11 and the inner peripheral wall 12 are preferably more than 0.3 mm and not more than 10 mm, more preferably 0.5 mm to 5 mm, and even more preferably 1 mm to 3 mm. In addition, when the heat exchange member 100 and the heat conductive member are used for heat storage applications, it is also preferable to set the thickness of the outer peripheral wall 11 to 10 mm or more to increase the heat capacity of the outer peripheral wall 11. The thickness of the partition walls 13 is preferably 0.1 to 1 mm, and more preferably 0.2 to 0.6 mm. By making the thickness of the partition walls 13 0.1 mm or more, it is possible to ensure sufficient mechanical strength of the honeycomb structure 10. Furthermore, by making the thickness of the partition walls 13 1 mm or less, it is possible to suppress problems such as an increase in pressure loss due to a decrease in the opening area and a decrease in heat recovery efficiency due to a decrease in the contact area with the first fluid.

[0028] The outer peripheral wall 11, the inner peripheral wall 12, and the partition walls 13 are mainly composed of ceramics. "Mainly composed of ceramics" means that the mass ratio of ceramics to the total mass of the outer peripheral wall 11, the inner peripheral wall 12, and the partition walls 13 is 50 mass% or more.

[0029] The porosity of the outer peripheral wall 11, the inner peripheral wall 12, and the partition walls 13 is preferably 10% or less, more preferably 5% or less, and particularly preferably 3% or less. The porosity of the outer peripheral wall 11, the inner peripheral wall 12, and the partition walls 13 can also be 0%. By setting the porosity of the outer peripheral wall 11, the inner peripheral wall 12, and the partition walls 13 to 10% or less, the thermal conductivity can be improved.

[0030] The outer peripheral wall 11, the inner peripheral wall 12, and the partition walls 13 preferably contain, as a main component, SiC (silicon carbide) having high thermal conductivity. "Containing SiC (silicon carbide) as a main component" means that the mass ratio of SiC (silicon carbide) to the total mass of the outer peripheral wall 11, the inner peripheral wall 12, and the partition walls 13 is 50 mass% or more.

[0031] More specifically, materials such as Si-impregnated SiC, (Si+Al)-impregnated SiC, metal composite SiC, recrystallized SiC, Si3N4, and SiC can be used as the material for the outer peripheral wall 11, the inner peripheral wall 12, and the partition wall 13. Among them, a Si-SiC material (sintered body) mainly made of SiC particles as an aggregate and containing metal Si between the SiC particles is preferred because it can be manufactured at low cost and has high thermal conductivity. Specifically, it is preferred to use Si-impregnated SiC or (Si+Al)-impregnated SiC as a material. In this specification, "mainly made of SiC as an aggregate" means that the proportion of SiC particles in the total mass of the aggregate is 50 mass% or more, preferably 70 mass% or more, more preferably 80 mass% or more, and particularly preferably 95 mass% or more.

[0032] The cell density (i.e., the number of cells 16 per unit area) in the cross section of the honeycomb structure 10 perpendicular to the flow direction of the first fluid is not particularly limited and may be appropriately adjusted depending on the application, etc., but is preferably 4 to 320 cells / cm. 2 The cell density is preferably in the range of 4 cells / cm. 2 By setting the cell density at or above 320 cells / cm, the strength of the partition walls 13, and therefore the strength and effective GSA (geometric surface area) of the honeycomb structure 10 itself can be sufficiently ensured. 2 By setting the above value, it is possible to prevent an increase in pressure loss when the first fluid flows.

[0033] The isostatic strength of the honeycomb structure 10 is preferably more than 100 MPa, more preferably 150 MPa or more, and even more preferably 200 MPa or more. When the isostatic strength of the honeycomb structure 10 exceeds 100 MPa, the honeycomb structure 10 has excellent durability. The isostatic strength of the honeycomb structure 10 can be measured in accordance with the isostatic strength measurement method stipulated in JASO standard M505-87, which is an automotive standard issued by the Society of Automotive Engineers of Japan.

[0034] The diameter (outer diameter) of the outer peripheral wall 11 in a cross section perpendicular to the flow path direction of the first fluid is preferably 20 to 200 mm, more preferably 30 to 100 mm. By setting the diameter in this range, the heat recovery efficiency can be improved. When the outer peripheral wall 11 is not circular, the diameter of the maximum inscribed circle inscribed in the cross-sectional shape of the outer peripheral wall 11 is defined as the diameter of the outer peripheral wall 11. Furthermore, the diameter of the inner circumferential wall 12 in a cross section perpendicular to the flow path direction of the first fluid is preferably 1 to 50 mm, and more preferably 2 to 30 mm. When the cross-sectional shape of the inner circumferential wall 12 is not circular, the diameter of the maximum inscribed circle inscribed in the cross-sectional shape of the inner circumferential wall 12 is defined as the diameter of the inner circumferential wall 12.

[0035] The thermal conductivity of the honeycomb structure 10 at 25° C. is preferably 50 W / (m·K) or more, more preferably 100 to 300 W / (m·K), and even more preferably 120 to 300 W / (m·K). By setting the thermal conductivity of the honeycomb structure 10 within this range, the thermal conductivity is improved, and the heat within the honeycomb structure 10 can be efficiently transferred to the outside. The thermal conductivity value is a value measured by a laser flash method (JIS R1611-1997).

[0036] When exhaust gas is made to flow as the first fluid through the cells 16 of the honeycomb structure 10, it is preferable to support a catalyst on the partition walls 13 of the honeycomb structure 10. By supporting a catalyst on the partition walls 13, it becomes possible to convert CO, NOx, HC, and the like in the exhaust gas into harmless substances by catalytic reaction, and it becomes possible to use the reaction heat generated during the catalytic reaction for heat exchange. The catalyst preferably contains at least one element selected from the group consisting of precious metals (platinum, rhodium, palladium, ruthenium, indium, silver, and gold), aluminum, nickel, zirconium, titanium, cerium, cobalt, manganese, zinc, copper, tin, iron, niobium, magnesium, lanthanum, samarium, bismuth, and barium. The above elements may be contained as simple metals, metal oxides, or other metal compounds.

[0037] The amount of catalyst (catalyst metal + carrier) supported is preferably 10 to 400 g / L. In the case of a catalyst containing a precious metal, the amount supported is preferably 0.1 to 5 g / L. When the amount of catalyst (catalyst metal + carrier) supported is 10 g / L or more, the catalytic action is easily exhibited. On the other hand, when the amount is 400 g / L or less, the pressure loss and the increase in manufacturing costs can be suppressed. The carrier is a support on which the catalyst metal is supported. The carrier preferably contains at least one selected from the group consisting of alumina, ceria, and zirconia.

[0038] The covering member 20 is not particularly limited as long as it can cover the outer peripheral surface of the outer peripheral wall 11 of the honeycomb structure 10. For example, a tubular member that fits onto the outer peripheral surface of the outer peripheral wall 11 of the honeycomb structure 10 and covers the outer peripheral wall 11 of the honeycomb structure 10 can be used. In addition, from the viewpoint of a cushioning effect, an inorganic mat or the like may be interposed between the honeycomb structure 10 and the covering member 20. In this specification, the term "fitting" refers to the honeycomb structure 10 and the covering member 20 being fixed in a mutually fitted state. Therefore, the fitting of the honeycomb structure 10 and the covering member 20 includes fixing methods using fitting such as clearance fitting, interference fitting, and shrink fitting, as well as methods in which the honeycomb structure 10 and the covering member 20 are fixed to each other by brazing, welding, diffusion bonding, and the like.

[0039] The covering member 20 can have an inner surface shape corresponding to the outer peripheral wall 11 of the honeycomb structure 10. When the inner surface of the covering member 20 is in direct contact with the outer peripheral wall 11 of the honeycomb structure 10, the thermal conductivity is improved and the heat in the honeycomb structure 10 can be efficiently transferred to the covering member 20.

[0040] From the viewpoint of improving the heat recovery efficiency, it is preferable that the ratio of the area of ​​the outer peripheral surface of the outer peripheral wall 11 of the honeycomb structure 10 that is circumferentially covered by the covering member 20 to the total area of ​​the outer peripheral surface of the outer peripheral wall 11 of the honeycomb structure 10 is high. Specifically, the area ratio is preferably 80% or more, more preferably 90% or more, and even more preferably 100% (i.e., the entire outer peripheral surface of the outer peripheral wall 11 of the honeycomb structure 10 is circumferentially covered by the covering member 20). Note that the "peripheral wall 11" referred to here refers to a surface of the honeycomb structure 10 that is parallel to the flow direction of the first fluid, and does not include surfaces of the honeycomb structure 10 that are perpendicular to the flow direction of the first fluid (first end face 14 and second end face 15).

[0041] From the viewpoint of manufacturability, the covering member 20 is preferably made of metal. In addition, if the covering member 20 is made of metal, it is also advantageous in that welding to the outer cylinder 30 (casing) described below can be easily performed. For example, stainless steel, titanium alloy, copper alloy, aluminum alloy, brass, etc. can be used as the material of the covering member 20. Among them, stainless steel is preferable because it has high durability and reliability and is inexpensive.

[0042] The thickness of the covering member 20 is preferably 0.1 mm or more, more preferably 0.3 mm or more, and even more preferably 0.5 mm or more, for reasons of durability and reliability. The thickness of the covering member 20 is preferably 10 mm or less, more preferably 5 mm or less, and even more preferably 3 mm or less, for reasons of reducing thermal resistance and increasing thermal conductivity.

[0043] The length of the covering member 20 (the length in the flow path direction of the first fluid) is not particularly limited and may be appropriately adjusted depending on the size of the honeycomb structure 10. For example, the length of the covering member 20 is preferably greater than the length of the honeycomb structure 10. Specifically, the length of the covering member 20 is preferably 5 mm to 250 mm, more preferably 10 mm to 150 mm, and further preferably 20 mm to 100 mm. When the length of the covering member 20 is greater than the length of the honeycomb structure 10 , it is preferable that the covering member 20 is provided so that the honeycomb structure 10 is located at the center thereof.

[0044] Next, a method for manufacturing the heat exchanger 100 and the heat conductive member will be described, however, the method for manufacturing the heat exchanger 100 and the heat conductive member is not limited to the manufacturing method described below. First, a clay containing ceramic powder is extruded into a desired shape to produce a honeycomb molded body. At this time, by selecting a die and a jig of an appropriate shape, the shape and density of the cells 16, the number, length and thickness of the partition walls 13, the shapes and thicknesses of the outer peripheral wall 11 and the inner peripheral wall 12, etc. can be controlled. In addition, the above-mentioned ceramics can be used as the material of the honeycomb molded body. For example, when manufacturing a honeycomb molded body mainly composed of a Si-impregnated SiC composite material, a binder and water or an organic solvent are added to a predetermined amount of SiC powder, the resulting mixture is kneaded to form a clay, and molded to obtain a honeycomb molded body of a desired shape. Then, the obtained honeycomb molded body is dried, and metal Si is impregnated and fired in a reduced pressure inert gas or vacuum to obtain a honeycomb structure 10 (thermal conductive member).

[0045] Next, the honeycomb structure 10 is shrink-fitted into the covering member 20, so that the outer peripheral surface of the outer wall 11 of the honeycomb structure 10 is covered with the covering member 20. Specifically, the covering member 20 is heated and expanded, the honeycomb structure 10 is inserted into the covering member 20, and then the covering member 20 is cooled and contracted, so that the honeycomb structure 10 can be fixed in the covering member 20. As described above, the honeycomb structure 10 and the covering member 20 can be fitted together by a fixing method using fitting such as a clearance fit or an interference fit, as well as shrink fitting, brazing, welding, diffusion bonding, or the like, in addition to shrink fitting. In this manner, the heat exchange member 100 can be obtained.

[0046] The heat exchange member 100 and heat conduction member according to the first embodiment of the present invention have a plurality of cells 16, which serve as a flow path for the first fluid, each of which is formed from an outer peripheral wall 11, an inner peripheral wall 12, and partition walls 13 extending in the radial direction, thereby making it possible to achieve both improved heat recovery efficiency and suppression of increases in pressure loss.

[0047] (2) Heat exchanger The heat exchanger according to the first embodiment of the present invention has the above-mentioned heat exchange member 100. The members other than the heat exchange member 100 are not particularly limited, and known members can be used. For example, the heat exchanger according to the first embodiment of the present invention can include the heat exchange member 100 and an outer cylinder (casing) arranged at a distance from the outer periphery of the covering member 20 of the heat exchange member 100 so that the second fluid can flow around the outer periphery of the covering member 20.

[0048] Fig. 4 is a cross-sectional view parallel to the flow path direction of the first fluid in the honeycomb structure of the heat exchanger according to the first embodiment of the present invention. Fig. 5 is a cross-sectional view taken along line b-b' of the heat exchanger shown in Fig. 4, which is a cross-sectional view perpendicular to the flow path direction of the first fluid in the honeycomb structure of the heat exchanger according to the first embodiment of the present invention.

[0049] A heat exchanger 200 according to the first embodiment of the present invention includes a heat exchange member 100 and an outer cylinder 30 arranged at a distance from the outer periphery of the covering member 20 of the heat exchange member 100 so that a second fluid can flow around the outer periphery of the covering member 20. The outer cylinder 30 has a supply pipe 31 and a discharge pipe 32 for the second fluid. In addition, it is preferable that the outer cylinder 30 covers the entire outer periphery of the heat exchange member 100. In the heat exchanger 200 having the above-mentioned structure, the second fluid flows into the outer casing 30 from the supply pipe 31. Next, while passing through the flow path of the second fluid, the second fluid exchanges heat with the first fluid flowing through the cells 16 of the honeycomb structure 10 via the covering member 20 of the heat exchange member 100, and is then discharged from the discharge pipe 32 of the second fluid. The outer peripheral surface of the covering member 20 of the heat exchange member 100 may be covered with a member for adjusting the heat transfer efficiency.

[0050] The second fluid is not particularly limited, but when the heat exchanger 200 is mounted on an automobile, the second fluid is preferably water or antifreeze (LLC as defined in JIS K2234:2006). Regarding the temperatures of the first and second fluids, it is preferable that the temperature of the first fluid is greater than the temperature of the second fluid. This is because the covering member 20 of the heat exchange element 100 does not expand at low temperatures, and the honeycomb structure 10 expands at higher temperatures, making it difficult for the fitting between the two to become loose. In particular, when the fitting between the honeycomb structure 10 and the covering member 20 is performed by shrink fitting, the risk of the fitting becoming loose and the honeycomb structure 10 falling off can be minimized.

[0051] The inner surface of the outer tube 30 is preferably fitted with the outer peripheral surface of the covering member 20 of the heat exchange member 100. In this way, the outer peripheral surface of the covering member 20 at both ends in the flow path direction of the first fluid is in close contact with the inner surface of the outer tube 30 in a circumferential manner, and the second fluid can be prevented from leaking to the outside. Methods for bringing the outer peripheral surface of the covering member 20 into close contact with the inner surface of the outer tube 30 include, but are not limited to, welding, diffusion bonding, brazing, mechanical fastening, and the like. Among these, welding is preferred because it has high durability and reliability and can also improve structural strength.

[0052] From the viewpoints of thermal conductivity and manufacturability, the outer cylinder 30 is preferably made of a metal. Examples of metals that can be used include stainless steel, titanium alloys, copper alloys, aluminum alloys, and brass. Among these, stainless steel is preferred because it is inexpensive and has high durability and reliability.

[0053] The thickness of the outer cylinder 30 is preferably 0.1 mm or more, more preferably 0.5 mm or more, and even more preferably 1 mm or more, for reasons of durability and reliability. The thickness of the outer cylinder 30 is preferably 10 mm or less, more preferably 5 mm or less, and even more preferably 3 mm or less, from the viewpoints of cost, volume, weight, etc.

[0054] The outer cylinder 30 may be an integrally molded product, or may be a joined member formed of two or more members. When the outer cylinder 30 is a joined member formed of two or more members, the design freedom of the outer cylinder 30 can be increased.

[0055] The positions of the supply pipe 31 and the discharge pipe 32 for the second fluid are not particularly limited, and can be appropriately changed in the axial and circumferential directions in consideration of the installation location of the heat exchanger 200, the piping position, the heat exchange efficiency, etc. For example, the supply pipe 31 and the discharge pipe 32 for the second fluid can be provided at positions corresponding to both axial ends of the honeycomb structure 10. Moreover, the supply pipe 31 and the discharge pipe 32 for the second fluid may extend in the same direction or in different directions.

[0056] The heat exchanger 200 according to the first embodiment of the present invention may further include an inner cylinder in the hollow portion (on the inner circumferential side of the inner circumferential wall 12) of the honeycomb structure 10, and an on-off valve provided in the inner cylinder. The inner tube may have a through hole formed therein for introducing the first fluid into the cells 16 of the honeycomb structure 10, and the through hole may branch the flow of the first fluid into two (the cells 16 of the honeycomb structure 10 and the hollow portion). The on-off valve can use its on-off mechanism to control the amount of the first fluid flowing through the hollow portion of the honeycomb structure 10. In particular, the on-off valve can selectively introduce the first fluid into the cells 16 of the honeycomb structure 10 through the through holes by blocking the flow of the first fluid inside the inner tube during heat exchange between the first fluid and the second fluid, thereby enabling efficient heat exchange between the first fluid and the second fluid.

[0057] The through-hole provided in the inner cylinder may be formed around the entire circumference of the inner cylinder, or may be formed at a partial position of the inner cylinder (for example, only the upper, middle, or lower part). The shape of the through-hole may be various shapes such as a circle, an ellipse, or a rectangle.

[0058] In the heat exchanger 200 having such a structure, the first fluid can be circulated inside the inner cylinder. At this time, when the on-off valve is closed, the airflow resistance inside the inner cylinder increases, and the first fluid selectively flows into the cells 16 through the through holes. On the other hand, when the on-off valve is open, the airflow resistance inside the inner cylinder decreases, and the first fluid selectively flows into the inner cylinder in the hollow part. Therefore, by controlling the opening and closing of the on-off valve, the amount of the first fluid flowing into the cells 16 can be adjusted. Note that the first fluid flowing through the inner cylinder in the hollow part hardly contributes to heat exchange with the second fluid, so the path of this first fluid functions as a bypass path when it is desired to suppress the heat recovery of the first fluid. In other words, when it is desired to suppress the heat recovery of the first fluid, the on-off valve should be opened.

[0059] Next, a description will be given of a manufacturing method of the heat exchanger 200. However, the manufacturing method of the heat exchanger 200 is not limited to the manufacturing method described below. The heat exchanger 200 can be manufactured by disposing and joining the outer cylinder 30 at a distance from the radial outside of the covering member 20 of the heat exchange member 100 so that the second fluid can flow around the outer periphery of the covering member 20. Specifically, both ends of the covering member 20 of the heat exchange member 100 are joined to the inner surface of the outer cylinder 30. As described above, there are various joining methods including fitting. If necessary, the joining points can be joined by welding or the like. As a result, the outer cylinder 30 that circumferentially covers the outer periphery of the covering member 20 is formed, and a flow path for the second fluid is formed between the outer periphery of the covering member 20 and the inner surface of the outer cylinder 30. In this manner, the heat exchanger 200 can be obtained. In addition, when an inner cylinder and an on-off valve are further provided, the following is provided inside the inner peripheral wall 12 of the honeycomb structure: An inner cylinder provided with an on-off valve is inserted and fitted by shrink fitting. As described above, the fitting between the inner peripheral wall 12 of the honeycomb structure 10 and the inner cylinder can be performed by a fixing method based on fitting, such as a clearance fit or an interference fit, in addition to shrink fitting, or further by brazing, welding, diffusion bonding, or the like.

[0060] The heat exchanger 200 according to the first embodiment of the present invention includes the above-described heat exchange member 100, and therefore can achieve both an improvement in heat recovery efficiency and suppression of an increase in pressure loss.

[0061] <Embodiment 2> (1) Heat exchange and heat conduction components Fig. 6 is a cross-sectional view parallel to the axial direction of the honeycomb structure of the heat exchanger element according to the second embodiment of the present invention. Fig. 7 is a cross-sectional view of the heat exchanger element shown in Fig. 6 taken along line c-c', i.e., a cross-sectional view perpendicular to the flow path direction (axial direction) of the first fluid of the honeycomb structure of the heat exchanger element according to the second embodiment of the present invention. Fig. 8 is a partial enlarged view of the honeycomb structure constituting the heat exchanger element shown in Fig. 7. 6 and 7, components denoted by the same reference numerals as those in FIGS. 1 and 2 indicate the same components as those in FIGS. 1 and 2, and therefore detailed description thereof will be omitted.

[0062] The heat exchange member 300 of embodiment 2 of the present invention comprises a honeycomb structure 50 having an outer peripheral wall 11, an inner peripheral wall 12, and partition walls 13 arranged between the outer peripheral wall 11 and the inner peripheral wall 12 and defining a plurality of cells 16 which serve as flow paths for a first fluid extending from a first end face 14 to a second end face 15, and a covering member 20 which covers the outer surface of the outer peripheral wall 11. Moreover, the partition walls 13 include partition walls 13a extending in the radial direction in a cross section of the honeycomb structure 50 perpendicular to the flow path direction of the first fluid (i.e., the cross section shown in FIG. 7). The partition walls 13 may further include partition walls 13b extending in the circumferential direction. As described above, the partition walls 13b extending in the circumferential direction do not contribute much to the heat exchange between the first fluid and the second fluid and are a cause of increased pressure loss. However, by providing the partition walls 13b within a range that does not impede both the improvement of heat recovery efficiency and the suppression of an increase in pressure loss, the mechanical strength of the honeycomb structure 10 can be ensured.

[0063] Moreover, among the components of the heat exchange member 300 according to the second embodiment of the present invention, those excluding the covering member 20 are referred to as a heat conducting member. That is, the heat conducting member according to the second embodiment of the present invention includes a honeycomb structure 50 having an outer peripheral wall 11, an inner peripheral wall 12, and partition walls 13 disposed between the outer peripheral wall 11 and the inner peripheral wall 12 and defining a plurality of cells 16 that serve as flow paths for a first fluid extending from a first end face 14 to a second end face 15.

[0064] In the heat exchange member 300 and the heat conduction member according to the second embodiment of the present invention, in a cross section of the honeycomb structure 50 perpendicular to the flow path direction of the first fluid, the ratio (N / D1) of the number N (pieces) of partition walls 13a extending in the radial direction to the outer diameter D1 (mm) of the honeycomb structure 50 is 3.2 pieces / mm or more, and preferably 4 pieces / mm or more. With this configuration, even when the partition walls 13b extending in the circumferential direction are present, it becomes easier to achieve both improvement in heat recovery efficiency and suppression of an increase in pressure loss.

[0065] In a cross section of the honeycomb structure 50 perpendicular to the flow direction of the first fluid, the aspect ratio of the cells 16 is not particularly limited, but is preferably at least 3, and more preferably at least 5. By controlling the aspect ratio within such a range, it becomes possible to stably achieve both improvement in heat recovery efficiency and suppression of an increase in pressure loss. Here, the aspect ratio of the cell 16 means the ratio L3 of the length of the radially extending partition wall 13a to the length L1 of the inner wall 12 constituting one cell 16, and the ratio L5 of the length of the radially extending partition wall 13a to the length L4 of the circumferentially extending partition wall 13b. The upper limit of the aspect ratio of the cells 16 is not particularly limited, but is generally 50 or less.

[0066] In a typical embodiment, the number of partition walls 13a extending in the radial direction is 200 to 500, and preferably 300 to 500. The lengths L3 and L5 of the partition walls 13a extending in the radial direction constituting one cell 16 are 0.85 to 10 mm. The length L1 of the inner peripheral wall 12 and the length L4 of the partition walls 13b extending in the circumferential direction constituting one cell 16 are 0.1 to 2 mm. With this configuration, it is possible to improve the heat recovery efficiency while suppressing an increase in pressure loss.

[0067] When the partition walls 13 include both the partition walls 13a extending in the radial direction and the partition walls 13b extending in the circumferential direction, it is preferable that the thickness of the partition walls 13a extending in the radial direction is greater than the thickness of the partition walls 13b extending in the circumferential direction. Since the thickness of the partition walls 13 correlates with the thermal conductivity, such a configuration can make the thermal conductivity of the partition walls 13a extending in the radial direction greater than the thermal conductivity of the partition walls 13b extending in the circumferential direction. As a result, the heat of the first fluid flowing through the cells 16 can be efficiently transferred to the outside of the honeycomb structure 50. The thickness of the partition walls 13 (the partition walls 13a extending in the radial direction and the partition walls 13b extending in the circumferential direction) is not particularly limited and may be appropriately adjusted depending on the application. The thickness of the partition walls 13 is preferably 0.1 to 1 mm, and more preferably 0.2 to 0.6 mm. By making the thickness of the partition walls 13 0.1 mm or more, the mechanical strength of the honeycomb structure 50 can be made sufficient. Furthermore, by making the thickness of the partition walls 13 1 mm or less, problems such as increased pressure loss due to a decrease in the opening area and decreased heat recovery efficiency due to a decrease in the contact area with the first fluid can be prevented.

[0068] The heat exchange member 300 and heat conduction member according to embodiment 2 of the present invention control the ratio (N / D1) of the number N (pieces) of partition walls 13a extending in the radial direction to the outer diameter D1 (mm) of the honeycomb structure 50, thereby achieving both improved heat recovery efficiency and suppression of increases in pressure loss.

[0069] (2) Heat exchanger The heat exchanger according to the second embodiment of the present invention has the above-mentioned heat exchange member 300. The members other than the heat exchange member 300 are not particularly limited, and known members can be used. For example, the heat exchanger according to the second embodiment of the present invention can include the heat exchange member 300 and an outer cylinder (casing) arranged at a distance from the outer periphery of the covering member 20 of the heat exchange member 300 so that the second fluid can flow around the outer periphery of the covering member 20. The heat exchanger according to the second embodiment of the present invention is the same as that shown in FIGS. 4 and 5 except that it has the above-mentioned heat exchange member 300, and therefore a detailed description thereof will be omitted.

[0070] The heat exchanger according to the second embodiment of the present invention includes the above-described heat exchange member 300, and therefore can achieve both improved heat recovery efficiency and suppression of an increase in pressure loss. EXAMPLES

[0071] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples in any way.

[0072] A clay containing SiC powder was extruded into a desired shape, dried, processed to a predetermined external dimension, impregnated with metal Si, and fired to produce a hollow honeycomb structure (cylindrical) composed of a Si-SiC material containing metal Si between SiC particles (Si-impregnated SiC) and having a circular hollow section perpendicular to the axial direction. All of the honeycomb structures produced had a diameter (outer diameter) D1 of the outer peripheral wall 11 of 75 mm, a diameter of the inner peripheral wall 12 of 57 mm, a length in the axial direction (direction of the flow path of the first fluid) of 15 mm, a thickness of the outer peripheral wall 11 and the inner peripheral wall 12 of 1 mm, a thickness of the partition walls 13a and 13b of 0.3 mm, and a thermal conductivity (25°C) of 150 W / (m·K). Other characteristics of the honeycomb structures are shown in Table 1.

[0073] Next, the honeycomb structures obtained in the above examples and comparative examples were shrink-fitted into a covering member to produce a heat exchanger. A stainless steel tubular member (thickness 1 mm) was used as the covering member. Next, the heat exchanger was placed in an outer cylinder (casing: thickness 1.5 mm) and both ends of the heat exchanger (covering member) were joined to the outer cylinder to produce a heat exchanger having the structure shown in Figures 4 and 5. The produced heat exchangers were evaluated as follows.

[0074] <Heat exchange test> A heat exchange test was carried out on the heat exchanger produced above by the following method. Air (first fluid) at a temperature of 400°C (Tg1) was flowed through the honeycomb structure at a flow rate (Mg) of 10 g / sec. Meanwhile, cooling water (second fluid) at 40°C was supplied from the supply pipe of the second fluid at a flow rate (Mw) of 10 L / min, and the cooling water after heat exchange was collected from the discharge pipe of the second fluid. Under the above conditions, immediately after starting the supply of air and cooling water to the heat exchanger and passing them through for 5 minutes, the temperature of the cooling water at the inlet of the second fluid (Tw1) and the temperature of the cooling water at the outlet of the second fluid (Tw2) were measured, and the amount of recovered heat Q was calculated. Q(kW)=ΔTw[K]×Cpw[J / (kg·K)]×Pw[kg / m 3 ]×Mw[L / min]÷(60×10 6 ) In the formula, ΔTw = Tw2 - Tw1, Cpw (specific heat of water) = 4182 J / (kg K), Pw (density of water) = 997 kg / m 3 It was decided.

[0075] <Pressure loss test> In the above-mentioned heat exchange test, pressure gauges were placed in the air flow paths located before and after the heat exchange element. The pressure loss of the air flowing in the heat exchange element (cell) was measured from the differential pressure obtained from the measurements of these pressure gauges. The above results are shown in Table 1.

[0076] [Table 1]

[0077] As shown in Table 1, Examples 1 to 3 had a larger amount of recovered heat than Comparative Examples 1 and 2. The amount of recovered heat depends on the number of partition walls 13a extending in the radial direction, and the more the number of partition walls 13a, the larger the amount of recovered heat tends to be. However, even when Example 1 and Comparative Example 2, which have the same number of partition walls 13a, are compared, the amount of recovered heat in Example 1 was larger. In addition, the pressure loss also depends on the number of partition walls 13a extending in the radial direction, and the greater the number of partition walls 13a, the higher the pressure loss. However, when comparing Example 1 and Comparative Example 2, which have the same number of partition walls 13a, the pressure loss in Example 1 was smaller.

[0078] As can be seen from the above results, the present invention can provide a heat exchange element and a heat exchanger that can improve heat recovery efficiency while suppressing an increase in pressure loss. In addition, the present invention can provide a heat conduction member that can be mounted on the heat exchange element and the heat exchanger. [Explanation of symbols]

[0079] 10,50 Honeycomb structure 11 Peripheral wall 12 Inner wall 13 Bulkhead 13a Radial partition 13b circumferentially extending partition 14 First end surface 15 Second end face 16 cells 20 Covering material 30 Outer cylinder 31 Supply pipe 32 Discharge pipe 100,300 Heat exchange material 200 heat exchanger

Claims

1. a honeycomb structure including an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall, the partition walls defining a plurality of cells that serve as flow paths for a first fluid and extend from a first end surface to a second end surface; A covering member that covers an outer peripheral surface of the outer peripheral wall; Equipped with In a cross section of the honeycomb structure perpendicular to a flow path direction of the first fluid, the partition walls extend in a radial direction, Each of the cells is formed by the outer peripheral wall, the inner peripheral wall, and the partition wall, A heat exchange element except for the case where the cells and the inner peripheral side of the inner peripheral wall are filled with porous ceramics.

2. 2. The heat exchange element according to claim 1, wherein in a cross section of the honeycomb structure perpendicular to the flow direction of the first fluid, a ratio of the number of the partition walls to an outer diameter (mm) of the honeycomb structure is 2.3 / mm or more.

3. 3. The heat exchange element according to claim 2, wherein in a cross section of the honeycomb structure perpendicular to the flow direction of the first fluid, a ratio of the number of the partition walls to an outer diameter (mm) of the honeycomb structure is 3.2 / mm or more.

4. 4. The heat exchange element according to claim 1, wherein the aspect ratio of the cells is 3 or more in a cross section of the honeycomb structure perpendicular to a flow direction of the first fluid.

5. a honeycomb structure including an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall, the partition walls defining a plurality of cells that serve as flow paths for a first fluid and extend from a first end surface to a second end surface; A covering member that covers an outer peripheral surface of the outer peripheral wall; Equipped with A heat exchange member, wherein in a cross section of the honeycomb structure perpendicular to a flow path direction of the first fluid, the partition walls include partition walls extending in a radial direction, and a ratio of the number of partition walls extending in the radial direction to an outer diameter (mm) of the honeycomb structure is 3.2 to 6 / mm.

6. The heat exchange element according to claim 5 , wherein the cells have an aspect ratio of 3 or more.

7. The heat exchange member according to any one of claims 1 to 6, an outer cylinder arranged radially outwardly of the covering member at a distance therefrom so that a second fluid can flow around the outer periphery of the covering member; A heat exchanger comprising:

8. A heat conduction member including a honeycomb structure having an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall, the partition walls defining a plurality of cells that serve as a flow path for a first fluid extending from a first end face to a second end face, the outer peripheral wall, the inner peripheral wall and the partition walls are made of a Si-SiC material mainly containing SiC particles as an aggregate and containing metal Si between the SiC particles; In a cross section of the honeycomb structure perpendicular to a flow path direction of the first fluid, the partition walls extend in a radial direction, Each of the cells is formed by the outer peripheral wall, the inner peripheral wall, and the partition wall, A heat conductive member except when the inside of the cells and the inner peripheral side of the inner peripheral wall are filled with porous ceramics.

9. 9. The heat conduction member according to claim 8, wherein in a cross section of the honeycomb structure perpendicular to the flow direction of the first fluid, the ratio of the number of partition walls (pieces) to the outer diameter (mm) of the honeycomb structure is 2.3 pieces / mm or more.

10. A heat conduction member including a honeycomb structure having an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall, the partition walls defining a plurality of cells that serve as a flow path for a first fluid extending from a first end face to a second end face, the outer peripheral wall, the inner peripheral wall and the partition walls are made of a Si-SiC material mainly containing SiC particles as an aggregate and containing metal Si between the SiC particles; A heat conductive member, wherein in a cross section of the honeycomb structure perpendicular to the flow direction of the first fluid, the partition walls include partition walls extending in a radial direction, and the ratio of the number of partition walls extending in the radial direction to the outer diameter (mm) of the honeycomb structure is 3.2 to 6 pieces / mm.

11. 11. The heat conducting member according to claim 8, wherein the aspect ratio of the cells is 3 or more in a cross section of the honeycomb structure perpendicular to a flow direction of the first fluid.

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