Heat transfer member and heat exchanger

Abstract

The present invention is provided with a plurality of inorganic porous bodies (10), and a housing (20) containing an inorganic material. The plurality of inorganic porous bodies (10) are arranged in layers and are joined to the inner surface of the housing (20), and at least some of the inorganic porous bodies (10) are separated from each other.

Description

Heat transfer member and heat exchanger

[0001] The present invention relates to a heat transfer member and a heat exchanger.

[0002] Various types of heat exchangers are known for use in semiconductor devices, etc. For example, Japanese Patent Publication No. 2016-085033 (JP2016-085033A) discloses a heat exchanger having a thin plate stack formed with a plurality of flow paths penetrating in the stacking direction.

[0003] In the heat exchanger disclosed in JP 2016-085033 A, the thin plate stack can have any polygonal shape, such as a rectangular parallelepiped, cylinder, semi-cylinder, oblong cylinder, elliptical cylinder, triangular prism, or octagonal prism, and the cross-sectional shape of the flow passages in the thin plate stack can also have any polygonal shape, such as a rectangle, triangle, circle, or semicircle. In this heat exchanger, the thin plates are stacked so that the relative positions of the holes in the multiple thin plates gradually change, and the first flow passage and the second flow passage are arranged adjacent to each other in at least two directions so that heat transfer occurs in at least two directions in the thin plate stack. This shortens the distance from the first flow passage to the second flow passage, thereby improving the heat exchange rate. In response to this, a new heat exchanger with a different structure is needed.

[0004] An object of the present invention is to provide a heat transfer member and a heat exchanger having a new and more useful structure.

[0005] The heat transfer member of the present disclosure is a heat transfer member comprising a plurality of inorganic porous bodies and a housing containing an inorganic material, wherein the plurality of inorganic porous bodies are arranged in layers and bonded to the inner surface of the housing, and at least some of the inorganic porous bodies are spaced apart from one another.

[0006] In the heat transfer member of the present disclosure, the layered inorganic porous bodies joined to the inner surface of the housing may be joined to each other via inorganic porous bodies arranged on adjacent horizontal surfaces.

[0007] The heat transfer member of the present disclosure may have an array structure made up of a plurality of inorganic porous bodies arranged on the horizontal surface.

[0008] In the heat transfer member of the present disclosure, the multiple inorganic porous bodies forming the array structure may be joined to each other via an inorganic porous body joined to the inner surface of the housing and / or an inorganic porous body provided in another array structure.

[0009] In the heat transfer member of the present disclosure, the inorganic porous body may be plate-shaped.

[0010] In the heat transfer member of the present disclosure, the inorganic porous body may have a space factor of 60 to 92%.

[0011] In the heat transfer member of the present disclosure, the inorganic porous body may include a metal member having a longitudinal axis and a lateral axis.

[0012] In addition, in the inorganic porous body, a plurality of the metal members may be arranged on the same plane.

[0013] In the heat transfer member of the present disclosure, the inorganic porous body may have a space factor of 20 to 92% by weight of the metal member.

[0014] In the heat transfer member of the present disclosure, the area of ​​a cross section perpendicular to the direction in which the longitudinal axis of the metal member extends is 0.1 to 6.0 mm ２ may be.

[0015] In the heat transfer member of the present disclosure, the plurality of metal members may be spaced apart from one another and arranged in the direction in which the longitudinal axis extends.

[0016] In the heat transfer member of the present disclosure, the inorganic porous body may contain a metal material.

[0017] In the heat transfer member of the present disclosure, the metal material may include metal particles at least partially in contact with each other.

[0018] In the heat transfer member of the present disclosure, the metal material may include at least metal fibers.

[0019] In the heat transfer member of the present disclosure, the housing may have at least one outlet and one inlet through which a fluid can enter and exit, and the spaces between the inorganic porous bodies and / or the pores in the inorganic porous bodies may form flow paths.

[0020] The heat exchanger of the present disclosure is characterized by including the heat transfer member of the present disclosure.

[0021] FIG. 1 is an exemplary conceptual diagram of a heat transfer member according to an embodiment of the present disclosure. FIG. 2 is an exemplary conceptual diagram of a heat transfer member according to an embodiment of the present disclosure. FIG. 3 is an exemplary conceptual diagram of a heat transfer member according to an embodiment of the present disclosure. FIG. 4 is an exemplary conceptual diagram of a heat transfer member according to an embodiment of the present disclosure. FIG. 5 is an exemplary conceptual diagram of a heat transfer member according to an embodiment of the present disclosure. FIG. 6 is an exemplary conceptual diagram of an inorganic porous body included in a heat transfer member according to an embodiment of the present disclosure. FIG. 7 is an exemplary conceptual diagram of an inorganic porous body included in a heat transfer member according to an embodiment of the present disclosure. FIG. 8 is an exemplary conceptual diagram of an inorganic porous body included in a heat transfer member according to an embodiment of the present disclosure. FIG. 9 is a diagram showing an exemplary arrangement structure of inorganic porous bodies in a heat transfer member. FIG. 10 is a diagram showing an exemplary arrangement structure of inorganic porous bodies in a heat transfer member. FIG. 11 is a diagram showing an exemplary arrangement structure of inorganic porous bodies in a heat transfer member. FIG. 12 is a conceptual diagram showing positions where test pieces were cut out from the inorganic porous body or copper plate arranged in Examples and Comparative Examples for evaluation of heat transfer properties and fluid diffusibility. FIG. 13 is a conceptual diagram showing positions where test pieces were cut out from the inorganic porous body or copper plate arranged in Examples and Comparative Examples for evaluation of heat transfer properties and fluid diffusibility.

[0022] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Figures 1A to 1F are exemplary conceptual diagrams of heat transfer members according to embodiments of the present disclosure. Figures 2A to 2C are exemplary conceptual diagrams of inorganic porous bodies included in heat transfer members according to embodiments of the present disclosure.

[0023] 1A to 1E, the heat transfer member 1 according to this embodiment has a more useful new structure, specifically including a plurality of inorganic porous bodies 10 and a housing 20 containing an inorganic material, the plurality of inorganic porous bodies 10 being arranged in layers and bonded to the inner surface of the housing 20, with at least some of the inorganic porous bodies 10 being spaced apart from one another. In this way, the inorganic porous bodies 10 have pores or the like, and are spaced apart from one another, thereby achieving both diffusibility of a fluid flowing inside the heat transfer member 1 and heat transferability.

[0024] In this specification, "arranged in layers" of a plurality of inorganic porous bodies 10 includes arranging the inorganic porous bodies 10 in a stacked state (vertically) (e.g., FIG. 1D ), but also means that a plurality of inorganic porous bodies 10 form a single layer, as shown in FIG. 1A . That is, a single layer may be formed by a plurality of inorganic porous bodies 10 on the same plane. Furthermore, the height (or upper and lower surfaces) of each inorganic porous body 10 do not necessarily have to be aligned on a plane (including the inner surface of the housing 20). Therefore, "on the same plane" also includes approximately the same plane, as long as the inorganic porous bodies 10 can be recognized as a single layer. The same applies to the array structures described below. There are no particular limitations on the arrangement of the inorganic porous bodies 10 in the horizontal direction (e.g., the X and Y directions in FIG. 4 ) within each layer or each array structure.

[0025] In the heat transfer member 1, the "inner surface" of the housing 20 to which the plurality of inorganic porous bodies 10 are bonded does not necessarily refer to the entire inner surface of the housing 20, as shown in FIG. 1A and other figures. As shown in FIGS. 1A to 1F, the main surface of the plate-shaped inorganic porous body 10 may be bonded to the inner surface of the housing 20. In another embodiment, the inorganic porous body 10 may be bonded to the inner surface of the housing 20 at its end surface. In this case, the "main surface" refers to the widest surface of the plate-shaped outer surface, and the "end surface" refers to the side surface adjacent to the main surface. Furthermore, the main surfaces of the plurality of inorganic porous bodies 10 may be horizontal (parallel, X direction, Y direction), perpendicular (Z direction), or inclined relative to the flow of fluid passing through the heat transfer member 1 (see FIG. 1E). In this way, flow paths in various directions can be provided.

[0026] Furthermore, the "separation" distance between the inorganic porous bodies 10 bonded to the inner surface of the housing 20 is not particularly limited, and can be appropriately set so as to obtain the desired fluid diffusivity within the heat transfer member 1. To maintain this separation distance, the layered inorganic porous bodies 10 bonded to the inner surface of the housing 20 can be bonded to each other via inorganic porous bodies 10 arranged on adjacent horizontal surfaces (e.g., Figures 1B and 1F). The bonding method herein is not particularly limited, and may be bonding (welding) by heating, or may use an adhesive (including silver paste, etc.), and any known method or means can be used. Furthermore, the "horizontal surface," like the "same plane" described above, also includes a substantially horizontal surface (note that the terms "horizontal surface" and "plane" used here refer to a surface in a mathematical and conceptual sense for explanatory purposes). Therefore, the layered inorganic porous body 10 bonded to the inner surface of the housing 20 and the inorganic porous body 10 arranged on the horizontal surface adjacent to the inorganic porous body 10 bonded to the inner surface of the housing 20 are not necessarily arranged parallel to each other.

[0027] The heat transfer member 1 may have an array structure consisting of multiple inorganic porous bodies 10 arranged on a horizontal surface (in FIG. 1C, one array structure is surrounded by a dashed line). In this specification, the term "arrangement structure" refers to a structural unit formed by multiple inorganic porous bodies 10 on a horizontal surface within the heat transfer member 1, forming a layer within the heat transfer member 1. The layered inorganic porous bodies 10 bonded to the inner surface of the housing 20 also form an array structure. As shown in FIG. 1C, the multiple inorganic porous bodies 10 in one array structure are preferably spaced apart from each other. As described above, they may be bonded to each other via the inorganic porous bodies 10 bonded to the inner surface of the housing 20 (FIG. 1C), or / and may be bonded to each other via inorganic porous bodies 10 included in another array structure (FIG. 1D). The number of array structures (number of layers), i.e., the height of the heat transfer member 1, as well as the width and length (dimensions) of the heat transfer member 1, can be adjusted appropriately depending on the structure, specifications, and application of the heat exchanger used. The number of inorganic porous bodies 10 in the array structure is not particularly limited and can be adjusted appropriately.

[0028] The space factor of the inorganic porous body 10 in the heat transfer member 1 is preferably 60 to 92%, more preferably 65 to 90%, and even more preferably 70 to 90%. When the space factor of the inorganic porous body 10 is within these ranges, good heat transfer and fluid diffusivity can be achieved. Here, the term "space factor" refers to the proportion (area ratio) of the area of ​​the metal portion (e.g., the metal member 11, metal particles 12a, and metal fibers 12b of the inorganic porous body 10) present in a cross section of the heat transfer member 1 excluding the housing 20. The space factor of the inorganic porous body 10 can be calculated, for example, by using a scanning electron microscope (SEM) and known image analysis software to calculate the average value of values ​​obtained by the following formula for a cross section of the inorganic porous body 10 in a direction perpendicular to each layer of the heat transfer member 1 (e.g., the cross section shown in Figures 1A to 1E): Space factor (%) = area occupied by metal in inorganic porous body 10 / (area occupied by metal in inorganic porous body 10 + area occupied by non-metal in inorganic porous body 10) × 100

[0029] (Inorganic porous body 10) The inorganic porous body 10 is preferably plate-shaped (FIGS. 1A to 1F, 2A to 2C, and 3A to 3C). The shape of each plate-shaped inorganic porous body 10 is not limited to the hexagonal shape shown in FIGS. 2A to 2C, and the inorganic porous body 10 can be manufactured in any shape, such as a triangle, a rectangle, a trapezoid, or a circle. Furthermore, the plate-shaped inorganic porous body 10 may have warping or unevenness.

[0030] The inorganic porous body 10 may include a metal member 11 and a metal material 12 having a longitudinal axis and a transverse axis (see, for example, FIGS. 2A and 2B). At least one of the metal member 11 and the metal material 12 may be copper, silver, stainless steel, or aluminum. Examples of other metals include gold, iron, chromium, beryllium, tungsten, molybdenum, and alloys thereof. The metal member 11 and the metal material 12 may contain two or more of the above metals. Furthermore, the metal member 11 and the metal material 12 may be made of the same or different materials.

[0031] In the inorganic porous body 10, multiple metal members 11 may be arranged on the same plane (FIG. 2B). The arrangement of the metal members 11 is not particularly limited, but it is preferable from the viewpoint of heat transfer and fluid diffusivity that the multiple metal members 11 be spaced apart from one another and arranged in the direction of the longitudinal axis (FIG. 2C). Furthermore, by arranging the metal members 11 at intervals from one another, even if the metal members 11 expand or contract due to heat, only the inorganic porous body 10 expands or contracts, and the overall heat transfer member 1 is not significantly affected.

[0032] The space factor of the metal member 11 in the inorganic porous body 10 is preferably 20 to 90%, more preferably 20 to 80%, and even more preferably 40 to 70%. When the space factor of the metal member 11 is within these ranges, good heat transfer and fluid diffusivity can be achieved. The "space factor" of the metal member 11 is the proportion of the area where the metal member 11 is present in one inorganic porous body 10. The space factor of the metal member 11 can also be determined, for example, as the average area ratio of a cross section of the inorganic porous body 10 in a direction perpendicular to each layer of the heat transfer member 1, using a scanning electron microscope (SEM) and known image analysis software. Space factor (%) = area occupied by the metal member 11 / (area of ​​one inorganic porous body 10 (i.e., area occupied by the metal member 11 + area occupied by parts other than the metal member 11)) × 100

[0033] The dimensions (length, width, thickness, etc.) of the inorganic porous bodies 10 are not particularly limited and can be appropriately adjusted depending on the application, etc. In the heat transfer member 1, the shapes and dimensions of the inorganic porous bodies 10 may be the same or different.

[0034] (Metal member 11) As described above, the metal member 11 has a longitudinal axis and a lateral axis (see, for example, Figures 2B and 2C). For ease of processing, the metal member 11 preferably has a solid rod shape. The metal member 11 may be hollow, and may be, for example, an organic material plated with a metal. Furthermore, the metal member 11 is preferably bonded to other materials (such as the metal material 12) in the inorganic porous body 10. By bonding the metal member 11 to other materials, the thermal conductivity and homogeneity of the inorganic porous body 10 (heat transfer member 1) tend to be stable.

[0035] The area (cross-sectional area) of the metal member 11 in a cross section perpendicular to the direction in which the longitudinal axis extends is 0.1 to 6.0 mm ２ It is preferable that the thickness is 0.2 to 4.0 mm. ２ More preferably, it is 0.4 to 2.0 mm ２ It is even more preferable that the thickness of the metal member 11 is greater. The thicker the metal member 11, the higher the heat transferability, and it is preferable from the viewpoint of heat transferability and fluid diffusivity that the cross-sectional area of ​​the metal member 11 is within these ranges. The cross-sectional area of ​​the metal member 11 can be calculated as follows. That is, it is the average value of the areas obtained by calculating the cross-sectional area of ​​the metal member 11 in any cross section perpendicular to the longitudinal direction of the metal member 11 imaged with a microscope (for example, calculated using known software; for example, the average value of five metal members 11).

[0036] The dimensions of the metal members 11 may be the same or different in each inorganic porous body 10. The number and dimensions of the metal members 11 may be the same or different for each inorganic porous body 10.

[0037] (Metallic Material 12) The metallic material 12 may include metallic particles 12a, some of which are in contact with one another. The metallic particles 12a in contact with one another can form a porous body (inorganic porous body 10) that serves as a flow path (FIG. 2A). The shape, size, etc. of the metallic particles 12a are not particularly limited. The metallic material 12 may include metallic fibers 12b in addition to or instead of the metallic particles 12a. The metallic fibers 12b can also form a porous body that serves as a flow path (FIG. 2A). More specifically, the metallic material 12 may be obtained by heating and drying a paste containing the metallic particles 12a. Furthermore, a metallic fiber body (described below) that matches the shape of the inorganic porous body 10 can be used as the metallic fiber 12b. In the inorganic porous body 10, the metallic material 12 can also serve to join (fix) each metal member 11. FIG. 3A shows an example of an inorganic porous body 10 including three metal members 11 (one of which is surrounded by a dotted line), in which the metal members 11 are bonded together by a porous metal material 12 containing metal particles 12a. FIGS. 3B and 3C show examples in which the metal members 11 are bonded together by a metal material 12 containing metal fibers 12b. Of these structures, the inorganic porous body 10 shown in FIG. 3B is preferred because the heat transfer member 1 has high strength, heat transfer properties, flexibility (stress relaxation, pliability, bendability), and fluid diffusivity. Different inorganic porous bodies 10 may be bonded together via the metal member 11 ( FIGS. 3A and 3B ) or via the metal material 12 ( FIG. 3C ). Furthermore, in the heat transfer member 1, the bonding method (orientation of the arrangement structure) between the inorganic porous bodies 10 may be uniform or not.

[0038] (Metal Fiber Body) The metal fiber body includes metal fibers 12b, and these metal fibers 12b may be entangled with each other, or the entangled points may be bonded together. Examples of metal fiber bodies include metal paper and metal mesh, and a nonwoven fabric in which the metal fibers 12b are bonded together is preferred. A metal fiber body with entangled points can be manufactured, for example, by a wet papermaking method, but the manufacturing method is not particularly limited. Preferred materials for the metal fibers 12b include copper, aluminum, stainless steel, etc. The average diameter of the metal fibers 12b may be 1 to 30 μm, and preferably 2 to 20 μm. When the average diameter of the metal fibers 12b is within these ranges, good heat transfer and fluid diffusivity can be achieved. The average diameter of the metal fibers 12b can be calculated as follows. That is, the average length is an average value (for example, the average value of five metal fibers 12b) obtained by calculating the diameter of a circle having the same area as the area obtained by calculating the cross-sectional area of ​​the metal fibers 12b in any cross section perpendicular to the longitudinal direction of the metal fibers 12b imaged with a microscope (for example, calculated using known software). The average length of the metal fibers 12b may be 1 to 10 mm, and preferably 3 to 5 mm. The average length of the metal fibers 12b is the average value measured with a microscope (for example, the average value of five metal fibers 12b).

[0039] The proportion (space factor) of the metal material 12 (the metal portion other than the pores; a formed body composed of metal particles 12a or metal fibers 12b) in the inorganic porous body 10 excluding the metal member 11 is preferably 15 to 70%, more preferably 21 to 60%, and even more preferably 30 to 60%. When the space factor of the metal material 12 is within these ranges, good heat transfer and fluid diffusivity can be achieved. The "space factor" of the metal material 12 is the proportion of the area of ​​the inorganic porous body excluding the metal member 11 that is occupied by the metal material 12. The space factor of the metal material 12 can also be determined, for example, as the average area ratio of a cross section of the inorganic porous body 10 in a direction perpendicular to each layer of the heat transfer member 1, using a scanning electron microscope (SEM) and known image analysis software. Space factor (%)=area occupied by the metal material 12 / (area occupied by one inorganic porous body 10 (i.e., area occupied by the metal material 12+area occupied by materials other than the metal material 12)−area occupied by the metal member 11)×100

[0040] (Housing 20) As shown in Figures 1A to 1F, the housing 20 accommodates or houses multiple inorganic porous bodies 10 and is bonded as described above. Known housings 20 may be used, and examples of inorganic materials constituting the housing 20 include copper, aluminum, stainless steel, nickel, brass, alumina, silicon carbide, aluminum nitride, and solid carbon materials (graphene, graphite, carbon fiber, etc.). The housing 20 may include at least one outlet 21 and one inlet 22 through which fluid can enter and exit (Figure 1E). In such a housing 20, the pores and gaps between the multiple inorganic porous bodies 10 and / or within the inorganic porous bodies 10 (such as metal fibers 12b) function as flow paths. This structure of the heat transfer member 1 achieves excellent heat transfer and fluid diffusibility.

[0041] The dimensions (height, length, width, etc.) of the housing 20 are not particularly limited, and can be appropriately changed in design depending on the structure, specifications, applications, etc. of the heat exchanger.

[0042] (Method and Use of Heat Transfer Member 1) In a method for producing the heat transfer member 1, for example, first, a slurry solution containing metal particles 12a or a metal fiber body (metal fibers 12b) is prepared. Next, this slurry solution is applied to a metal plate, such as a stainless steel plate, that has been subjected to a release treatment, to a predetermined thickness, and a predetermined number of rod-shaped metal members 11 are sunk into the coating film and dried at a predetermined temperature. Here, the drying and heating temperature needs to be adjusted according to the melting point of the metal used so that the metal particles 12a do not melt (liquefy). On the other hand, a predetermined number of rod-shaped metal members 11 are arranged and bonded to the metal fiber body. The bonded metal members 11 and metal material 12 are cut into a predetermined shape (e.g., a hexagonal shape) to obtain a plate-shaped inorganic porous body 10. At this time, cutting may be performed using a mold for the inorganic porous body 10. Alternatively, a metal member 11 having a predetermined shape may be prepared in advance and then bonded to the metal material 12. The plurality of inorganic porous bodies 10 obtained as described above are arranged and bonded in layers on the inner surface of the housing 20 so that at least some of the inorganic porous bodies 10 are spaced apart from one another. In this way, the heat transfer member 1 is manufactured.

[0043] The heat transfer member 1 can achieve good heat transfer and fluid diffusibility, and therefore can be used as a heat dissipation / heat transfer member for a heat exchanger. Therefore, according to the present disclosure, there is provided a heat exchanger including the above-mentioned heat transfer member 1. The heat exchanger of the present disclosure includes the heat transfer member 1, and therefore has good heat transfer and fluid diffusibility.

[0044] The heat transfer member 1 and heat exchanger of this embodiment configured as described above include a plurality of inorganic porous bodies 10 and a housing 20 containing an inorganic material, the plurality of inorganic porous bodies 10 being arranged in layers and bonded to the inner surface of the housing 20, with at least some of the inorganic porous bodies 10 being spaced apart from one another. This heat transfer member 1 and heat exchanger have a more useful new structure and can exhibit good heat transfer and fluid diffusivity. The mechanism of action is thought to be that the inorganic porous bodies 10 being spaced apart from one another and being porous increases the contact area with the fluid, thereby improving heat transfer from the fluid to the heat transfer member 1.

[0045] In the heat transfer member 1 and the heat exchanger of this embodiment, the layered inorganic porous bodies 10 bonded to the inner surface of the housing 20 may be bonded to each other via the inorganic porous bodies 10 arranged on adjacent horizontal surfaces (e.g., FIG. 1B ). In this way, the inorganic porous bodies 10 forming the same layer are not bonded to each other, and the distance between the inorganic porous bodies 10 can be maintained.

[0046] Furthermore, the heat transfer member 1 and the heat exchanger of this embodiment may have an array structure (e.g., FIG. 1C ) made up of a plurality of inorganic porous bodies 10 arranged on a horizontal surface adjacent to the inner surface of the housing 20. The plurality of inorganic porous bodies 10 forming such an array structure are not directly bonded to each other but are bonded via the inorganic porous bodies 10 on the inner surface of adjacent housings 20, so that the distance between the inorganic porous bodies 10 can be more firmly maintained.

[0047] Furthermore, in the heat transfer member 1 and heat exchanger of this embodiment, the inorganic porous bodies 10 forming the array structure may be joined to one another via an inorganic porous body 10 joined to the inner surface of the housing 20 and / or an inorganic porous body 10 included in another array structure (FIGS. 1C and 1D). By joining the array structures together in this way, the spacing between the inorganic porous bodies 10 can be more reliably maintained, good heat transfer properties and fluid diffusibility can be exhibited, and a heat transfer member and heat exchanger having a more useful new structure can be provided.

[0048] In the heat transfer member 1 and the heat exchanger of the present embodiment, the inorganic porous bodies 10 may be plate-shaped (FIGS. 1A to 1F, 2A to 2C, and 3A to 3C). If the inorganic porous bodies 10 are plate-shaped, the inorganic porous bodies 10 can be easily handled, and the inorganic porous bodies 10 can be efficiently arranged in layers.

[0049] In the heat transfer member 1 and the heat exchanger of this embodiment, the inorganic porous body 10 may have a space factor of 60 to 92%. When the space factor of the inorganic porous body 10 is within this range, good heat transfer properties and fluid diffusibility can be achieved.

[0050] In the heat transfer member 1 and the heat exchanger of this embodiment, the inorganic porous body 10 includes a metal member 11 having a longitudinal axis and a lateral axis (see, for example, FIGS. 2B and 2C ). The inclusion of the strong metal member 11 allows the inorganic porous body 10 to exhibit good heat transfer properties while maintaining fluid diffusibility.

[0051] In the heat transfer member 1 and the heat exchanger of this embodiment, the metal members 11 in the inorganic porous body 10 can be arranged on the same plane (see, for example, FIG. 2B ), thereby improving heat transfer while maintaining fluid diffusivity.

[0052] In the heat transfer member 1 and the heat exchanger of this embodiment, the space factor of the metal member 11 in the inorganic porous body 10 may be 20 to 90%. In this way, good heat transfer properties and fluid diffusibility can be achieved.

[0053] In the heat transfer member 1 and the heat exchanger of this embodiment, the area of ​​the cross section perpendicular to the direction in which the longitudinal axis of the metal member 11 extends is 0.1 to 6.0 mm ２ In this way, good heat transfer and fluid diffusion properties can be achieved.

[0054] In the heat transfer member 1 and the heat exchanger of this embodiment, the metal members 11 may be spaced apart from one another and arranged in the direction of the longitudinal axis (FIG. 2C), thereby achieving good heat transfer and fluid diffusivity.

[0055] In the heat transfer member 1 and the heat exchanger of this embodiment, the inorganic porous body 10 may contain a metal material 12 (see, for example, FIG. 2A ). Such a metal can improve heat transfer.

[0056] In the heat transfer member 1 and the heat exchanger of this embodiment, the metal material 12 may include metal particles 12a that are partially in contact with each other. The metal material 12 may also include metal fibers 12b. Such a material can achieve porosity, good heat transfer properties, and fluid diffusivity, and can provide a heat transfer member and a heat exchanger having a more useful new structure.

[0057] In the heat transfer member 1 and the heat exchanger of this embodiment, at least one of the metal member 11 and the metal material 12 may be a copper material, a silver material, a stainless steel material, an aluminum material, or a nickel material. Such materials can be suitably used depending on the application.

[0058] In the heat transfer member 1 and the heat exchanger of this embodiment, the housing 20 may have at least one outlet 21 and one inlet 22 through which a fluid can enter and exit, and the flow paths may be formed between the inorganic porous bodies 10 and / or through pores in the inorganic porous bodies 10. In this way, good heat transfer properties and fluid diffusibility can be achieved.

[0059] The heat transfer member 1 and the heat exchanger according to this embodiment are not limited to the above-described aspects and combinations.

[0060] The present disclosure will be described in more detail below using examples and comparative examples.

[0061] Examples 1, 3 to 12 Inorganic porous bodies were produced using the materials shown in Table 1. That is, a metal member was placed on a metal fiber body shown in Table 1, and they were bonded to each other using an electric furnace set at 1100°C. The body was then cut into the shapes and sizes shown in Table 1 to obtain inorganic porous bodies. The measurement results of the space factor of each obtained inorganic porous body and the space factor of the metal member and metal material in each inorganic porous body are shown in Table 1 (each measurement result is the average of five measured values). The metal fiber body used was a copper fiber sheet (average thickness 3 mm), produced by a wet papermaking method using copper fibers (average diameter 17 μm, average length 4 mm).

[0062] Example 2 An inorganic porous body was produced using the materials shown in Table 1. That is, a slurry solution (solid content: 50%, solvent: glycerin) containing copper particles (5.2 μm in 50% particle size calculated by laser diffraction particle size distribution measurement, manufactured by Nippon Atomize Kako Co., Ltd., product name "SFR-Cu") was applied to a release-treated stainless steel plate so that the thickness after drying was 3 mm, and a metal member shown in Table 1 was sunk into the coated surface (see FIG. 3A), and N ２The inorganic porous bodies were heated at 250°C for 1 hour in an atmosphere. Thereafter, the inorganic porous bodies were released from the stainless steel plate and cut into shapes and sizes shown in Table 1. The measurement results of the space factor of each of the obtained inorganic porous bodies and the space factor of the metal member and the metal material in each inorganic porous body are shown in Table 1.

[0063] <Comparative Example 1> A C1100 copper plate with a thickness of 3 mm was cut into the shape and size shown in Table 1 and used in Comparative Example 1. <Comparative Example 2> A metal fiber body (copper fiber sheet) was produced by the wet papermaking method as in Examples 1 and 3 to 12. The metal fiber bodies used in Comparative Example 2 each had a width of 100 mm, a length of 100 mm, and a thickness of 3 mm.

[0064] <Evaluation> (Evaluation of thermal cycle test) For Examples 1 to 12 and Comparative Example 1, for example, as shown in Figures 4A and 4B, each inorganic porous body and copper plate having the size shown in Table 1 were arranged so as to be spaced apart from each other, and placed on an alumina plate (100 mm wide x 100 mm long) with silver paste. Thereafter, depending on each Example and Comparative Example, inorganic porous bodies and copper plates constituting a different arrangement structure were stacked on the arranged inorganic porous bodies and copper plates with silver paste, and N ２ The copper fiber sheets were heated at 250°C for 1 hour in a 100mm wide x 100mm long x 3mm thick atmosphere to bond the copper fiber sheets together. Furthermore, for Comparative Example 2, seven sheets of the copper fiber sheets (100mm wide x 100mm long) were laminated on an alumina plate (100mm wide x 100mm long) with a thickness of 0.5mm using silver paste. ２The samples were heated to 250°C in an atmosphere for 1 hour to bond them together, and evaluation samples were obtained. Each evaluation sample obtained was placed in a thermostatic chamber set at -55°C and left to stand for 30 minutes, then heated to 150°C at a heating rate of 10°C / min and left to stand for 30 minutes. The temperature was then lowered to -55°C at a cooling rate of 10°C / min and left to stand for 30 minutes, after which a thermal cycle test was performed by repeatedly heating and lowering the temperature under the same conditions as above. Evaluation was performed according to the following criteria: A+: No cracking or peeling was observed after 500 cycles. A: Cracking or peeling was observed at 400 cycles or more but less than 500 cycles. B: Cracking or peeling was observed at 300 cycles or more but less than 400 cycles. C: Cracking or peeling was observed at 200 cycles or more but less than 300 cycles. D: Cracking or peeling was observed at less than 200 cycles.

[0065] (Evaluation of Thermal Conductivity) The thermal conductivity was measured for Examples 1 to 12 and Comparative Examples 1 and 2. That is, the evaluation samples for each Example and Comparative Example were cut into cylindrical shapes (38.1 mmφ) along the surface direction to obtain each test piece (see FIG. 4A). The thermal conductivity (thermal conductivity) of the obtained test pieces was measured using a thermal conductivity measuring device (TCT716Lambda, manufactured by NETZSCH). The evaluation was performed according to the following criteria: A: The thermal conductivity was 200 W / m·K or more. B: The thermal conductivity was 100 W / m·K or more and less than 200 W / m·K. C: The thermal conductivity was 50 W / m·K or more and less than 100 W / m·K. D: The thermal conductivity was less than 50 W / m·K.

[0066] (Evaluation of Pressure Loss and Fluid Diffusivity) For Examples 1 to 12 and Comparative Examples 1 and 2, each evaluation sample was cut into a cylindrical shape (10.0 mmφ) along the cross-sectional direction to obtain each test piece (see FIG. 4B). The outlet side of the sealed test piece was suctioned with a compressor, and the air permeation flow rate was adjusted to 4.0 liters / minute according to the value of the flow meter. The pressure loss at this time was calculated with a manometer (manufactured by Nagano Keiki Co., Ltd., product name "GC63"). Evaluation was performed according to the following criteria: A: Less than 90 mTorr. B: 90 mTorr or more and less than 150 mTorr. C: 150 mTorr or more and less than 200 mTorr. D: 200 mTorr or more, or no permeation.

[0067]

[0068] (Overall Evaluation) As shown in Table 1, Examples 1 to 12 have a (new) structure different from conventional structures, and compared to Comparative Examples 1 and 2, they have superior durability against heat cycles and can achieve both heat transfer and fluid diffusivity.

[0069] In Comparative Example 1, which had an array structure like the Examples but the array structure was formed from a solid copper plate rather than a porous body, the heat transfer was good but the durability and fluid diffusivity were inferior to Examples 1 to 12. With regard to durability against thermal cycles, it is thought that in the case of a solid metal material, the stress caused by dimensional changes due to thermal expansion and thermal contraction could not be absorbed, and peeling and cracking occurred at the interface with the different materials. With regard to fluid diffusivity, compared to the Examples using a porous body, Comparative Example 1 using a solid metal plate had no pores that acted as flow paths and had few spaces (flow paths) through which the fluid could pass, which is thought to result in high pressure loss, i.e., low fluid diffusivity.

[0070] In Comparative Example 2, unlike the Examples, the inorganic porous bodies are not spaced apart from each other. In particular, the fluid diffusibility of Comparative Example 2 was poor. This is thought to be due to the lack of spaces (flow paths) between the inorganic porous bodies.

[0071] Furthermore, among the examples, focusing on Examples 3 to 6, the higher the space factor of the inorganic porous body (the closer to solid), the higher the heat transferability tended to be. Furthermore, the lower the space factor of the inorganic porous body (the more pores / gaps), the higher the fluid diffusivity tended to be (the higher the space factor of the inorganic porous body, the lower the fluid diffusivity). Furthermore, the lower the space factor of the metal member in the inorganic porous body, the higher the fluid diffusivity tended to be. Furthermore, it was found that good heat transferability and fluid diffusibility can be achieved when the space factor of the inorganic porous body is 60 to 92% and when the space factor of the metal member in the inorganic porous body is 20 to 90%. These results suggest that a good balance of heat transferability and fluid diffusibility is achieved when the porosity is neither too high nor too low. In Example 8, both the space factor of the inorganic porous body and the space factor of the metal member in the inorganic porous body were within the above ranges, but the fluid diffusivity was rated "C." This is thought to be due to the relatively high space factor of the metal fiber body in Example 8, which is 65% (few gaps, nearly solid).

[0072] In particular, in Examples 9 to 12, the cross-sectional area of ​​the metal member is 0.1 to 6.0 mm ２ It can be seen that good heat transfer and fluid diffusivity can be achieved when the cross-sectional area of ​​the metal member is larger (thicker), and the fluid diffusivity tends to be higher when the cross-sectional area of ​​the metal member is smaller (thinner). This suggests that, taking into account the results of Examples 3 to 6, the cross-sectional area of ​​the metal member has an effect similar to that of the space factor of the inorganic porous body. Furthermore, the smaller the cross-sectional area of ​​the metal member is, the higher the durability tends to be.

[0073] It can be considered that the evaluation results of Examples 1 and 2 are substantially the same. That is, it can be seen that the metal material 12 constituting the inorganic porous body 10 may be a porous metal material 12 containing metal particles 12a or a metal material 12 containing metal fibers 12b.

Claims

1. A heat transfer member comprising a plurality of inorganic porous bodies and a housing containing an inorganic material, wherein the plurality of inorganic porous bodies are arranged in layers, are joined to the inner surface of the housing, and at least some of the inorganic porous bodies are spaced apart from each other.

2. The heat transfer member according to claim 1, wherein the layered inorganic porous bodies joined to the inner surface of the housing are joined to each other via inorganic porous bodies arranged on adjacent horizontal planes.

3. The heat transfer member according to claim 2, comprising an array structure composed of a plurality of inorganic porous bodies arranged on a plurality of the horizontal planes.

4. The heat transfer member according to claim 3, wherein the plurality of inorganic porous bodies forming the array structure are joined to each other via an inorganic porous body joined to the inner surface of the housing and / or an inorganic porous body provided with another array structure.

5. The heat transfer member according to any one of claims 1 to 4, wherein the inorganic porous body is plate-shaped.

6. The heat transfer member according to any one of claims 1 to 5, wherein the occupancy ratio of the inorganic porous body is 60 to 92%.

7. The heat transfer member according to any one of claims 1 to 6, wherein the inorganic porous body contains a metal member having a longitudinal axis and a short axis.

8. The heat transfer member according to claim 7, wherein in the inorganic porous body, a plurality of the metal members are arranged in the same plane.

9. The heat transfer member according to claim 7, wherein the occupancy ratio of the metal member in the inorganic porous body is 20 to 90%.

10. The area in a cross-section perpendicular to the direction in which the longitudinal axis of the metal member extends is 0.1 to 6.0 mm ２ The heat transfer member according to claim 7, which is such.

11. The heat transfer member according to claim 7, wherein the plurality of the metal members are spaced apart from each other and are arranged in the direction in which the longitudinal axis extends.

12. The heat transfer member according to any one of claims 1 to 11, wherein the inorganic porous body contains a metal material.

13. The heat transfer member according to claim 12, wherein the metal material contains metal particles at least partially in contact with each other.

14. The heat transfer member according to claim 12, wherein the metal material contains at least metal fibers.

15. The heat transfer member according to any one of claims 1 to 14, wherein the housing is provided with at least one outlet and at least one inlet through which a fluid can enter and exit, and between the plurality of inorganic porous bodies and / or the pores provided in the inorganic porous body are flow paths.

16. A heat exchanger comprising the heat transfer member according to any one of claims 1 to 15.

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