Heat exchange element and heat exchange ventilation device

Abstract

A heat exchange element (100) is provided with first partition plates (1) and second partition plates (2) which are alternately stacked, and each of the first partition plates (1) and the second partition plates (2) has opposed flow sections (10, 20) which exchange heat between a fluid flowing through a plurality of first flow paths (3) and a fluid flowing through a plurality of second flow paths (4). The opposing flow section (10) of the first partition plate (1) has a waveform shape in which a plurality of first flow path ribs (11) protruding from one surface in the stacking direction are arranged in parallel, and the opposing flow section (20) of the second partition plate (2) has a waveform shape in which a plurality of second flow path ribs (21) protruding from one surface in the stacking direction are arranged in parallel. The length of the first flow path rib (11) in the stacking direction is longer than that of the second flow path rib (21), and the opposing flow section (20) of the second partition plate (2) is formed of a sheet having higher moisture permeability than that of the opposing flow section (10) of the first partition plate (1).

Description

Technical Field

[0001] The present disclosure relates to a heat exchange element that allows two fluids, a supply flow and an exhaust flow, to pass between stacked plates to perform heat exchange between the fluids, and a heat exchange ventilator having the heat exchange element. Background Art

[0002] The flow forms of two fluids used in existing heat exchange elements include: orthogonal flow in which the two fluids flow orthogonally to each other, and opposing flow in which the two fluids flow opposite to each other. However, under the condition of the same pressure loss, the heat exchange amount per unit volume of the opposing flow form is theoretically greater. Therefore, most existing heat exchange ventilation devices use heat exchange elements in the opposing flow form.

[0003] Patent document 1 discloses a heat exchange element having a plurality of flow paths formed by a plate and each flow path having a rectangular cross-section in an opposing flow form. The existing heat exchange element disclosed in Patent document 1 allows two fluids to pass alternately and oppositely along the up-down direction and left-right direction of each flow path, so that heat exchange can be performed between the left and right flow paths in addition to the heat exchange between the up-down flow paths through the partition plate constituting the flow path. In this way, the existing heat exchange element has a larger heat exchange area than a heat exchange element with a simple structure in which two fluids are alternately opposed only along the up-down direction through the partition plate. In addition, the existing heat exchange element can increase the cross-sectional area of ​​each flow path and obtain a wider heat exchange area by setting the shape of each flow path to a rectangular shape that is long in the up-down direction. As a result, the existing heat exchange element can suppress pressure loss and obtain a higher sensible heat exchange efficiency.

[0004] Patent Document 1: International Publication No. 2013 / 091099

[0005] However, the heat exchange element requires a high total heat exchange efficiency. In order to obtain a high total heat exchange efficiency, not only the sensible heat exchange efficiency is required, but also the humidity exchange efficiency needs to be good. In order to improve the humidity exchange efficiency, a partition plate with high moisture permeability needs to be used. However, due to the characteristics of the material such as poor elongation of the material with high moisture permeability, it is difficult to form it into a rectangular shape that is long in the vertical direction.

[0006] Therefore, in the conventional heat exchange element having a vertically long rectangular flow path, a material with high moisture permeability cannot be used, so there is a problem that the sensible heat exchange efficiency is high, but the humidity exchange efficiency is poor, and the improvement of the total heat exchange efficiency is limited.

[0007] In addition, in order to improve the total heat exchange efficiency, there is a method of increasing the number of stacked sheets to increase the heat exchange area. However, if the rectangular shape that is long in the vertical direction is kept unchanged and the number of stacked sheets is simply increased, although the heat exchange efficiency can be improved, the size of the heat exchange element becomes larger. On the other hand, if the size of the heat exchange element is kept unchanged and the number of stacked sheets is increased, the cross-sectional area of ​​each flow path becomes smaller, resulting in an issue of increased pressure loss.

[0008] Therefore, in the existing total heat exchange elements, it is difficult to achieve both high total heat exchange efficiency and low pressure loss. Summary of the invention

[0009] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a heat exchange element and a heat exchange ventilator that can achieve both high total heat exchange efficiency and low pressure loss.

[0010] In the heat exchange element disclosed in the present invention, the first partition plate and the second partition plate are alternately stacked, and a plurality of first flow paths are formed between the surface of the first partition plate on one side of the stacking direction and the surface of the second partition plate on the other side of the stacking direction, and a plurality of second flow paths are formed between the surface of the first partition plate on the other side of the stacking direction and the surface of the second partition plate on one side of the stacking direction.

[0011] Moreover, the first partition plate and the second partition plate respectively have: an opposing flow portion for heat exchange between a fluid flowing in a plurality of first flow paths and a fluid flowing in a plurality of second flow paths, the opposing flow portion of the first partition plate has: a corrugated shape in which a plurality of first flow path ribs are arranged in parallel and protruded from a surface on one side of the stacking direction, the opposing flow portion of the second partition plate has: a corrugated shape in which a plurality of second flow path ribs are arranged in parallel and protruded from a surface on one side of the stacking direction, the first flow path ribs are longer in the stacking direction than the second flow path ribs, and the opposing flow portion of the second partition plate is formed by a sheet having higher moisture permeability than that of the opposing flow portion of the first partition plate.

[0012] The heat exchange element disclosed herein exhibits the effect of being able to achieve both high total heat exchange efficiency and low pressure loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a perspective view showing a schematic structure of a heat exchange element according to Embodiment 1.

[0014] Figure 2 This is a perspective view showing a first partition plate of the heat exchange element according to Embodiment 1.

[0015] Figure 3 This is a perspective view showing a second partition plate of the heat exchange element according to Embodiment 1.

[0016] Figure 4It is a cross-sectional view showing a state in which the opposing flow portions of the first partition plate and the opposing flow portions of the second partition plate are alternately stacked.

[0017] Figure 5 It is a cross-sectional view showing a state in which the opposing flow portions of the first partition plate and the opposing flow portions of the second partition plate are alternately stacked.

[0018] Figure 6 This is a diagram showing a schematic structure of a heat exchange ventilator according to a second embodiment. DETAILED DESCRIPTION

[0019] Hereinafter, the heat exchange element and the heat exchange ventilator according to the embodiment of the present disclosure will be described in detail based on the drawings. In addition, the same reference numerals are given to the same or corresponding parts in each figure, and the repeated description of the parts is appropriately simplified or omitted.

[0020] Implementation Method 1

[0021] Figure 1 1 is a perspective view showing a simplified structure of an opposed flow type heat exchange element 100 according to Embodiment 1. The heat exchange element 100 is formed in a hexagonal column shape. The heat exchange element 100 is formed by alternately stacking first partition plates 1 and second partition plates 2. The number of first partition plates 1 constituting the heat exchange element 100 and the number of second partition plates 2 constituting the heat exchange element 100 are both arbitrary.

[0022] In the following description, the direction in which the first partition plate 1 and the second partition plate 2 are stacked is referred to as the "stacking direction". In addition, the stacking direction is sometimes referred to as the "up-down direction". In addition, the upper surface of the first partition plate 1 and the second partition plate 2 is referred to as the "surface", and the surface on the opposite side to the surface is referred to as the "back surface". Here, the surface of the first partition plate 1 and the second partition plate 2 is also referred to as the "surface on one side of the stacking direction". In addition, the back surfaces of the first partition plate 1 and the second partition plate 2 are also referred to as the "surface on the other side of the stacking direction".

[0023] exist Figure 1 , a first flow path 3 is shown in which a fluid flows in a direction schematically indicated by solid arrows F1, F2, F3, F4, and F5. The first flow path 3 is formed between the surface of the adjacent first partition plate 1 and the back surface of the second partition plate 2. Figure 1 2 shows a second flow path 4 in which a fluid flows in a direction schematically indicated by dashed arrows G1, G2, G3, G4, and G5. The second flow path 4 is formed between the back surface of the first partition plate 1 and the surface of the second partition plate 2 adjacent to each other.

[0024] In the following description, the fluid flowing in the first flow path 3 is referred to as a "supply flow", and the fluid flowing in the second flow path 4 is referred to as an "exhaust flow". In addition, the direction orthogonal to the direction in which the first flow path 3 or the second flow path 4 extends and the stacking direction is referred to as a "flow path width direction".

[0025] Figure 2 This is a perspective view showing first partition plate 1 of heat exchange element 100 according to Embodiment 1. Figure 2 Shown from Figure 1 The state of the first partition plate 1 is observed in the same direction. An opposing flow portion 10 for performing heat exchange between the supply air flow and the exhaust air flow is formed in the center of the first partition plate 1. In the opposing flow portion 10, sensible heat exchange is mainly performed. Here, sensible heat exchange refers to the exchange of "heat" between the supply air flow and the exhaust air flow. The shape of the opposing flow portion 10 observed along the stacking direction (the shape observed from above or below) is rectangular. In addition, a plurality of first flow path ribs 11 extending from the upstream side of the supply air flow along the downstream side are formed in parallel on the surface of the opposing flow portion 10. The first flow path ribs 11 protrude upward from the surface of the opposing flow portion 10. Moreover, a portion of the first flow path 3 is formed between two adjacent first flow path ribs 11.

[0026] The bottom side 12a of the triangular upstream header section 12 is connected to the upstream end 10a as the upstream side among the four sides of the rectangular opposing flow section 10. In addition, the bottom side 13a of the triangular downstream header section 13 is connected to the downstream end 10b as the downstream side among the four sides of the rectangular opposing flow section 10.

[0027] A plurality of first fins 12b are formed at intervals in the upstream header portion 12. These first fins 12b are arranged in parallel with the first oblique side 12c of the upstream header portion 12. The first oblique side 12c is also referred to as "one oblique side".

[0028] A part of the first flow path 3 is formed between two adjacent first fins 12 b. Therefore, the supply airflow passes between the two adjacent first fins 12 b and flows into the opposing flow portion 10 from the upstream end portion 10 a of the opposing flow portion 10 .

[0029] A plurality of first fins 13b are formed at intervals in the downstream header portion 13. These first fins 13b are arranged in parallel with the first oblique side 13c of the downstream header portion 13. The first oblique side 13c is also referred to as "one oblique side".

[0030] A part of the first flow path 3 is formed between two adjacent first fins 13b. Therefore, the supply airflow flowing out from the downstream end 10b of the opposing flow portion 10 travels between the two adjacent first fins 13b.

[0031] Figure 3 This is a perspective view showing second partition plate 2 of heat exchange element 100 according to Embodiment 1. Figure 3 Shown from Figure 1 The state of the second partition plate 2 is observed in the same direction. An opposing flow portion 20 for performing heat exchange between the supply air flow and the exhaust air flow is formed in the center of the second partition plate 2. In the opposing flow portion 20, humidity exchange is mainly performed. The shape of the opposing flow portion 20 observed along the stacking direction (the shape observed from above or below) is a rectangle. In addition, a plurality of second flow path ribs 21 extending from the upstream side of the exhaust air flow along the downstream side are formed in parallel on the surface of the opposing flow portion 20. The second flow path ribs 21 protrude upward from the surface of the opposing flow portion 20. Moreover, a portion of the second flow path 4 is formed between two adjacent second flow path ribs 21.

[0032] The bottom side 22a of the triangular upstream header section 22 is connected to the upstream end 20a of the four sides of the rectangular opposing flow section 20, and the bottom side 23a of the triangular downstream header section 23 is connected to the downstream end 20b of the four sides of the rectangular opposing flow section 20, which is the downstream side.

[0033] A plurality of second fins 22b are formed at intervals in the upstream header portion 22. These second fins 22b are arranged parallel to the second oblique side 22c of the upstream header portion 22. The second oblique side 22c is also referred to as "the other oblique side".

[0034] A part of the second flow path 4 is formed between two adjacent second fins 22 b. Therefore, the exhaust gas flows through between the two adjacent second fins 22 b and flows into the opposing flow portion 20 from the upstream end portion 20 a of the opposing flow portion 20 .

[0035] A plurality of second fins 23b are formed at intervals in the downstream header portion 23. These second fins 23b are arranged parallel to the second oblique side 23c of the downstream header portion 23. The second oblique side 23c is also referred to as "the other oblique side".

[0036] A part of the second flow path 4 is formed between two adjacent second fins 23b. Therefore, the exhaust gas flow flowing out from the downstream end 20b of the opposing flow portion 20 travels between the two adjacent second fins 23b.

[0037] Figure 4 It is a cross-sectional view showing a state where the opposing flow portions 10 and the opposing flow portions 20 are alternately stacked. Figure 4 Shown in Figure 1 A cross-sectional view of the opposing flow portion 10 and the opposing flow portion 20 cut along a plane perpendicular to the extending direction of the first flow channel 3 or the second flow channel 4 in FIG.

[0038] like Figure 4 As shown, an inverted U-shaped (in reference to Figure 4 In the case of the first flow path ribs 11, the first flow path ribs 11 are convex toward the upper side of the paper. The first flow path ribs 11 are composed of a top 11a and a pair of side wall portions 11b and 11c. The plurality of first flow path ribs 11 are arranged in parallel, so that the opposing flow portion 10 has a corrugated shape as a whole.

[0039] Similarly, an inverted U-shaped (see FIG. Figure 4 In the case of the second flow path ribs 21, the second flow path ribs 21 are convex toward the upper side of the paper. The second flow path ribs 21 are composed of a top 21a and a pair of side wall portions 21b and 21c. The plurality of second flow path ribs 21 are arranged in parallel, so that the opposing flow portion 20 has a corrugated shape as a whole.

[0040] In addition, the cross-sectional shape of the first flow path rib 11 and the second flow path rib 21 is not limited to a rectangle, and may be a polygon such as a trapezoid or a hexagon.

[0041] like Figure 4 As shown, the opposing flow portion 10 is stacked on the opposing flow portion 20 in such a manner that the bottom of the first flow path rib 11 covers the top 21a of the second flow path rib 21. In addition, the opposing flow portion 20 is stacked on the opposing flow portion 10 in such a manner that the bottom of the second flow path rib 21 covers the top 11a of the first flow path rib 11. Moreover, the first flow path 3 is formed in the area 3a sandwiched by two adjacent first flow path ribs 11 and the area 3b surrounded by the top 21a and the side wall portions 21b and 21c of the second flow path rib 21. Similarly, the second flow path 4 is formed in the area 4a sandwiched by two adjacent second flow path ribs 21 and the area 4b surrounded by the top 11a and the side wall portions 11b and 11c of the first flow path rib 11. The cross-sectional shapes of the first flow path 3 and the second flow path 4 are both rectangular.

[0042] Here, Figure 4 The symbol "+" recorded in the first flow path 3 in the figure shows the direction of the supply airflow from the front to the back of the paper. Figure 4 The symbol “-” recorded in the second flow path 4 in FIG. 4 shows the direction of the exhaust flow from the depth of the paper to the front. In addition, the symbol “+” and the symbol “-” are Figure 5 The same is true in Chinese.

[0043] In this way, the first flow path 3 and the second flow path 4 are adjacent in the stacking direction and also in the flow path width direction. Therefore, heat exchange between the supply air flow and the exhaust air flow is performed not only between the first flow path 3 and the second flow path 4 adjacent in the stacking direction, but also between the first flow path 3 and the second flow path 4 adjacent in the flow path width direction.

[0044] The opposing flow section 10 is made of a non-moisture-permeable sheet such as plastic or metal. The sheet is bent by stamping, compression molding, vacuum molding, etc. to form a corrugated opposing flow section 10 in which a plurality of first flow path ribs 11 are arranged in parallel. Similarly, the opposing flow section 20 is made of a highly moisture-permeable sheet such as a highly moisture-permeable resin or paper to which a moisture-permeable material is added. The sheet is bent by stamping, compression molding, vacuum molding, etc. to form a corrugated opposing flow section 20 in which a plurality of second flow path ribs 21 are arranged in parallel.

[0045] In addition, the sheet used as the opposing flow portion 10 and the sheet used as the opposing flow portion 20 are preferably a single flat plate sheet. If a single flat sheet is used, the opposing flow portion 10 and the opposing flow portion 20 can be formed by a simple processing method such as press processing, thereby improving processing performance.

[0046] The sheet material used in the opposing flow section 10 has a higher expansion / contraction ratio than the sheet material used in the opposing flow section 20. Therefore, the opposing flow section 10 can be easily shaped compared to the opposing flow section 20. Therefore, each of the side wall portions 11b and 11c of the plurality of first flow path ribs 11 is extended in the stacking direction, and the length A of each of the plurality of first flow path ribs 11 in the stacking direction is made longer than the length B of each of the plurality of second flow path ribs 21 in the stacking direction, thereby increasing the heat exchange area in the opposing flow section 10.

[0047] Specifically, the aspect ratio of the first flow path rib 11 is greater than 2, while the aspect ratio of the second flow path rib 21 is about 1. Here, the aspect ratio is the ratio of the length A in the stacking direction of the first flow path rib 11 to the length C in the flow path width direction (A / C), or the ratio of the length B in the stacking direction of the second flow path rib 21 to the length C in the flow path width direction (B / C).

[0048] Thus, the opposed flow portion 10 having a wider heat exchange area contributes to an improvement in sensible heat exchange efficiency compared to the opposed flow portion 20. Here, sensible heat exchange efficiency refers to the efficiency of exchanging "heat associated with temperature changes" between the supply airflow and the exhaust airflow.

[0049] On the other hand, the sheet material used in the opposing flow section 20 is a material having higher moisture permeability than the sheet material used in the opposing flow section 10. Therefore, the sheet material used in the opposing flow section 20 has better performance in humidity exchange than the sheet material used in the opposing flow section 10. Therefore, the opposing flow section 20 using a material having high moisture permeability contributes to an improvement in humidity exchange efficiency compared to the opposing flow section 10.

[0050] The aspect ratio of the first flow path rib 11 is not less than 2, but is not limited to this aspect ratio. By making at least the length A in the stacking direction longer than the length C in the flow path width direction, the heat exchange area in the opposing flow portion 10 can be ensured.

[0051] Furthermore, the aspect ratio of the second flow path rib 21 can also be adjusted within a processable range.

[0052] The heat exchange element 100 of this embodiment stacks the opposing flow section 10 that helps improve the sensible heat exchange efficiency and the opposing flow section 20 that helps improve the humidity exchange efficiency, so both the sensible heat exchange efficiency and the humidity exchange efficiency can be improved. If the sensible heat exchange efficiency and the humidity exchange efficiency are improved, the total heat exchange efficiency is also improved, so the heat exchange element 100 of this embodiment can obtain a high total heat exchange efficiency.

[0053] In addition, by lengthening the stacking direction length A of the first flow path rib 11 of the opposing flow section 10, the first fin 12b of the upstream header section 12, and the first fin 13b of the downstream header section 13, it is possible to widen the space of the flow path formed in the opposing flow section 10, the upstream header section 12, and the downstream header section 13 in the stacking direction. As a result, the heat exchange element 100 of the present embodiment can improve the total heat exchange efficiency and reduce the pressure loss inside the heat exchange element.

[0054] As described above, the heat exchange element 100 according to the present embodiment has the effect of achieving both high total heat exchange efficiency and low pressure loss.

[0055] Next, use Figure 5 Modifications of the heat exchange element according to the present embodiment will be described. Figure 5 It is a cross-sectional view showing a state where the opposing flow portions 30 and the opposing flow portions 40 are alternately stacked. Figure 5 and Figure 4 Same as shown in Figure 1 A cross-sectional view of the opposing flow portion 30 and the opposing flow portion 40 cut along a plane perpendicular to the extending direction of the first flow channel 3 or the second flow channel 4 in FIG.

[0056] This modification example Figure 1 The heat exchange element 100 shown is different in that the first partition plate 1 has an opposing flow portion 30 instead of the opposing flow portion 10, and the second partition plate 2 has an opposing flow portion 40 instead of the opposing flow portion 20. The other structures are the same or equivalent to the structure of the heat exchange element 100. In addition, the sheet material used in the opposing flow portion 30 is, for example, a non-moisture-permeable sheet such as plastic or metal. In addition, the sheet material used in the opposing flow portion 40 is, for example, a highly moisture-permeable sheet such as a highly moisture-permeable resin or paper to which a moisture-permeable material is added.

[0057] like Figure 5 As shown, a plurality of third flow path ribs 31 in an inverted V shape are continuously formed in the opposite flow portion 30 along the flow path width direction. The third flow path ribs 31 are composed of a pair of side wall portions 31a, 31b. The plurality of third flow path ribs 31 are arranged in parallel, so that the entire opposite flow portion 30 has a wavy shape. In addition, the opposite flow portion 40 has a planar shape without ribs. This is because the sheet material used in the opposite flow portion 40 has a low expansion and contraction rate and it is difficult to bend the sheet material to form a plurality of ribs.

[0058] Thus, the third flow path rib 31 has an inverted V shape, so the first flow path 3 having a triangular cross-sectional shape is formed in the region sandwiched by two adjacent third flow path ribs 31. In addition, the second flow path 4 having a triangular cross-sectional shape is formed in the region surrounded by a pair of side wall portions 31a and 31b in the third flow path rib 31. Moreover, sensible heat exchange and humidity exchange are performed between the supply airflow passing through the first flow path 3 and the exhaust airflow passing through the second flow path 4.

[0059] Furthermore, by forming the opposing flow portion 40 in a planar shape, it is possible to use a material that has problems in shaping, such as a material with low rigidity that is difficult to maintain a shaped shape, or a material whose moisture permeability decreases due to heating during shaping.

[0060] In addition, the cross-sectional shape of the third flow path rib 31 is not limited to a triangle, and may be a polygon such as a trapezoid or a pentagon. In addition, the sheet material used as the opposing flow portion 30 is preferably a flat plate sheet material. If a flat sheet material is used, the opposing flow portion 30 can be formed by a simple processing method such as stamping, so the processing performance is improved.

[0061] As described above, the heat exchange element of this embodiment stacks the opposed flow sections 10 and 30 that contribute to the improvement of sensible heat exchange efficiency and the opposed flow sections 20 and 40 that contribute to the improvement of humidity exchange efficiency. Therefore, in the heat exchange element of this embodiment, both the sensible heat exchange efficiency and the humidity exchange efficiency can be improved, and a high total heat exchange efficiency can be obtained.

[0062] In addition, by increasing the stacking direction length A of the first flow path ribs 11 and the first fins 12b and 13b, the pressure loss inside the heat exchange element can be reduced. Similarly, by increasing the stacking direction length of the third flow path ribs 31, the pressure loss inside the heat exchange element can be reduced.

[0063] As described above, the heat exchange element according to this embodiment has the effect of being able to achieve both high total heat exchange efficiency and low pressure loss.

[0064] Implementation Method 2

[0065] In Embodiment 2, a heat exchange ventilator including heat exchange element 100 of Embodiment 1 will be described. Figure 6 1 is a diagram showing a schematic structure of a heat exchange ventilator 200 equipped with a heat exchange element 100 .

[0066] The heat exchanging ventilator 200 includes an air supply blower 201 , an exhaust blower 202 , a heat exchanging element 100 , and a casing 203 .

[0067] The housing 203 is a box-shaped component that accommodates the supply air blower 201, the exhaust air blower 202, and the heat exchange element 100. The housing 203 is provided with a supply air duct 205 through which the supply air flow 204 passes, and an exhaust air duct 207 through which the exhaust air flow 206 passes. The supply air flow 204 is a supply air flow from the outside to the inside. The exhaust air flow 206 is an exhaust air flow from the inside to the outside. The side surface of the indoor side of the housing 203 is provided with a supply air outlet 208 and an exhaust air inlet 209. The side surface of the outdoor side of the housing 203 is provided with a supply air inlet 210 and an exhaust air outlet 211.

[0068] The supply air blower 201 is disposed in the supply air passage 205. The supply air blower 201 draws outdoor air from the supply air inlet 210 into the supply air passage 205 to generate a supply air flow 204. The supply air flow 204 is discharged indoors from the supply air outlet 208 through the supply air passage 205. The supply air blower 201 generates the supply air flow 204 from the outdoors to the indoors.

[0069] The exhaust blower 202 is disposed in the exhaust air passage 207. The exhaust blower 202 draws indoor air from the exhaust air intake port 209 into the exhaust air passage 207 to generate an exhaust flow 206. The exhaust flow 206 is discharged to the outside from the exhaust outlet 211 through the exhaust air passage 207. The exhaust blower 202 generates the exhaust flow 206 from the indoor to the outdoor.

[0070] The heat exchange element 100 is disposed at a position where the supply air passage 205 and the exhaust air passage 207 intersect. The heat exchange element 100 performs total heat exchange between the supply air flow 204 passing through the supply air passage 205 and the exhaust air flow 206 passing through the exhaust air passage 207.

[0071] Heat exchanging ventilator 200 according to Embodiment 2 includes heat exchanging element 100 according to Embodiment 1, and thus can obtain high total heat exchange efficiency.

[0072] The structures shown in the above embodiments represent an example of the content of the present disclosure. The structures of the embodiments can be combined with other known technologies. Part of the structures of the embodiments can be omitted or changed within the scope of the present disclosure.

[0073] Hereinafter, each aspect of the present disclosure will be collectively described as supplementary notes.

[0074] (Note 1)

[0075] A heat exchange element, wherein:

[0076] The first partition plate and the second partition plate are alternately stacked, a plurality of first flow paths are formed between a surface of the first partition plate on one side of the stacking direction and a surface of the second partition plate on the other side of the stacking direction, and a plurality of second flow paths are formed between a surface of the first partition plate on the other side of the stacking direction and a surface of the second partition plate on one side of the stacking direction,

[0077] The first partition plate and the second partition plate each have an opposing flow portion for performing heat exchange between the fluid flowing through the plurality of first flow paths and the fluid flowing through the plurality of second flow paths.

[0078] The opposing flow portion of the first partition plate has a corrugated shape in which a plurality of first flow path ribs protruding from one surface in the stacking direction are arranged in parallel.

[0079] The opposing flow portion of the second partition plate has a corrugated shape in which a plurality of second flow path ribs protruding from one surface in the stacking direction are arranged in parallel.

[0080] The first flow path rib is longer in the stacking direction than the second flow path rib.

[0081] The opposing flow portion of the second partition plate is formed of a sheet material having higher moisture permeability than the opposing flow portion of the first partition plate.

[0082] (Note 2)

[0083] The heat exchange element according to Supplementary Note 1, wherein:

[0084] The first flow path rib and the second flow path rib are respectively composed of a top portion and two side wall portions.

[0085] The first flow path is formed in a region sandwiched by two adjacent first flow path ribs and in a region surrounded by the top and the two side wall portions of the second flow path rib, and the second flow path is formed in a region sandwiched by two adjacent second flow path ribs and in a region surrounded by the top and the two side wall portions of the first flow path rib,

[0086] The first flow path and the second flow path have rectangular cross sections.

[0087] (Note 3)

[0088] The heat exchange element according to Supplement 1 or 2, wherein:

[0089] The length of each of the first flow path ribs in the stacking direction is longer than the length in a flow path width direction which is a direction orthogonal to the stacking direction and a traveling direction of the fluid flowing in the first flow path.

[0090] (Note 4)

[0091] A heat exchange element, wherein:

[0092] The first partition plate and the second partition plate are alternately stacked, a plurality of first flow paths are formed between a surface of the first partition plate on one side of the stacking direction and a surface of the second partition plate on the other side of the stacking direction, and a plurality of second flow paths are formed between a surface of the first partition plate on the other side of the stacking direction and a surface of the second partition plate on one side of the stacking direction,

[0093] The first partition plate and the second partition plate each have an opposing flow portion for performing heat exchange between the fluid flowing through the plurality of first flow paths and the fluid flowing through the plurality of second flow paths.

[0094] The opposing flow portion of the first partition plate has a corrugated shape in which a plurality of third flow path ribs protruding from one surface in the stacking direction are arranged in parallel.

[0095] The opposing flow portion of the second partition plate has a planar shape,

[0096] The opposing flow portion of the second partition plate is formed of a sheet material having higher moisture permeability than the opposing flow portion of the first partition plate.

[0097] (Note 5)

[0098] The heat exchange element according to Supplementary Note 4, wherein:

[0099] The third flow path rib is composed of a pair of side wall portions.

[0100] The first flow path is formed in a region sandwiched by two adjacent third flow path ribs, and the second flow path is formed in a region surrounded by the pair of side wall portions of the third flow path ribs.

[0101] The cross-sections of the first flow path and the second flow path are triangular.

[0102] (Note 6)

[0103] The heat exchange element according to any one of Supplementary Notes 1 to 5, wherein:

[0104] The opposing flow portion of the first partition plate and the opposing flow portion of the second partition plate are rectangular in shape when viewed along the stacking direction.

[0105] The first partition plate and the second partition plate each include an upstream header portion provided at an upstream end portion of the opposing flow portion and a downstream header portion provided at a downstream end portion of the opposing flow portion.

[0106] The upstream header section and the downstream header section are triangular in shape when viewed along the stacking direction.

[0107] The bottom side of the upstream header portion is aligned with the upstream end of the opposing flow portion, and the bottom side of the downstream header portion is aligned with the downstream end of the opposing flow portion.

[0108] The upstream header portion and the downstream header portion of the first partition plate each include: a plurality of first ribs arranged parallel to one of the two oblique sides;

[0109] The upstream header portion and the downstream header portion of the second partition plate each include a plurality of second fins arranged parallel to the other of the two oblique sides.

[0110] (Note 7)

[0111] The heat exchange element according to any one of Supplementary Notes 1 to 6, wherein:

[0112] The opposing flow portion of the first partition plate and the opposing flow portion of the second partition plate are each formed of a single flat sheet.

[0113] (Note 8)

[0114] The heat exchange element according to any one of Supplementary Notes 1 to 7, wherein:

[0115] The opposing flow portion of the first partition plate is formed of a plastic or metal sheet.

[0116] (Note 9)

[0117] The heat exchange element according to any one of Supplementary Notes 1 to 8, wherein:

[0118] The opposing flow portion of the second partition plate is formed of a sheet of paper or a moisture-permeable resin.

[0119] (Note 10)

[0120] A heat exchange ventilation device, wherein:

[0121] The heat exchange device comprises: the heat exchange element according to any one of Supplementary Notes 1 to 9, and a housing that accommodates the heat exchange element therein;

[0122] An air supply passage for supplying outdoor air to the room and an air exhaust passage for exhausting indoor air to the outside are formed inside the casing.

[0123] Description of Reference Numerals

[0124] 1…first partition plate; 2…second partition plate; 3…first flow path; 4…second flow path; 10, 20, 30, 40…opposite flow portion; 10a, 20a…upstream end portion; 10b, 20b…downstream end portion; 11…first flow path rib; 21…second flow path rib; 12, 22…upstream header portion; 13, 23…downstream header portion; 11a, 21a…top portion; 11b, 11c, 21b, 21c, 31a, 31b…side wall portion; 12a, 13a, 22a, 23a…bottom portion; 12b, 13b…first rib; 22b, 23b…second rib; 12c, 13c…first oblique side (oblique side on one side); 22c, 23c…second oblique side (oblique side on the other side); 31…third flow path rib.

Claims

1. A heat exchange element, characterized in that: The first partition plate and the second partition plate are alternately stacked, a plurality of first flow paths are formed between a surface of the first partition plate on one side of the stacking direction and a surface of the second partition plate on the other side of the stacking direction, and a plurality of second flow paths are formed between a surface of the first partition plate on the other side of the stacking direction and a surface of the second partition plate on one side of the stacking direction, The first partition plate and the second partition plate each have an opposing flow portion for performing heat exchange between the fluid flowing through the plurality of first flow paths and the fluid flowing through the plurality of second flow paths. The opposing flow portion of the first partition plate has a corrugated shape in which a plurality of first flow path ribs protruding from one surface in the stacking direction are arranged in parallel. The opposing flow portion of the second partition plate has a corrugated shape in which a plurality of second flow path ribs protruding from one surface in the stacking direction are arranged in parallel. The first flow path rib is longer in the stacking direction than the second flow path rib. The opposing flow portion of the second partition plate is formed of a sheet material having higher moisture permeability than the opposing flow portion of the first partition plate.

2. The heat exchange element according to claim 1, characterized in that The first flow path rib and the second flow path rib are respectively composed of a top portion and two side wall portions. The first flow path is formed in a region sandwiched by two adjacent first flow path ribs and in a region surrounded by the top and the two side wall portions of the second flow path rib, and the second flow path is formed in a region sandwiched by two adjacent second flow path ribs and in a region surrounded by the top and the two side wall portions of the first flow path rib, The first flow path and the second flow path have rectangular cross sections.

3. The heat exchange element according to claim 1, characterized in that The length of each of the first flow path ribs in the stacking direction is longer than the length in a flow path width direction which is a direction orthogonal to the stacking direction and a traveling direction of the fluid flowing in the first flow path.

4. A heat exchange element, characterized in that: The first partition plate and the second partition plate are alternately stacked, a plurality of first flow paths are formed between a surface of the first partition plate on one side of the stacking direction and a surface of the second partition plate on the other side of the stacking direction, and a plurality of second flow paths are formed between a surface of the first partition plate on the other side of the stacking direction and a surface of the second partition plate on one side of the stacking direction, The first partition plate and the second partition plate each have an opposing flow portion for performing heat exchange between the fluid flowing through the plurality of first flow paths and the fluid flowing through the plurality of second flow paths. The opposing flow portion of the first partition plate has a corrugated shape in which a plurality of third flow path ribs protruding from one surface in the stacking direction are arranged in parallel. The opposing flow portion of the second partition plate has a planar shape, The opposing flow portion of the second partition plate is formed of a sheet material having higher moisture permeability than the opposing flow portion of the first partition plate.

5. The heat exchange element according to claim 4, characterized in that The third flow path rib is composed of a pair of side wall portions. The first flow path is formed in a region sandwiched by two adjacent third flow path ribs, and the second flow path is formed in a region surrounded by the pair of side wall portions of the third flow path ribs. The cross-sections of the first flow path and the second flow path are triangular.

6. The heat exchange element according to any one of claims 1 to 5, characterized in that: The opposing flow portion of the first partition plate and the opposing flow portion of the second partition plate are rectangular in shape when viewed along the stacking direction. The first partition plate and the second partition plate each include an upstream header portion provided at an upstream end portion of the opposing flow portion and a downstream header portion provided at a downstream end portion of the opposing flow portion. The upstream header section and the downstream header section are triangular in shape when viewed along the stacking direction. The bottom side of the upstream header portion is aligned with the upstream end of the opposing flow portion, and the bottom side of the downstream header portion is aligned with the downstream end of the opposing flow portion. The upstream header portion and the downstream header portion of the first partition plate each include: a plurality of first ribs arranged parallel to one of the two oblique sides; The upstream header portion and the downstream header portion of the second partition plate each include a plurality of second fins arranged parallel to the other of the two oblique sides.

7. The heat exchange element according to any one of claims 1 to 5, characterized in that: The opposing flow portion of the first partition plate and the opposing flow portion of the second partition plate are each formed of a single flat sheet.

8. The heat exchange element according to any one of claims 1 to 5, characterized in that: The opposing flow portion of the first partition plate is formed of a plastic or metal sheet.

9. The heat exchange element according to any one of claims 1 to 5, characterized in that: The opposing flow portion of the second partition plate is formed of a sheet of paper or a moisture-permeable resin.

10. A heat exchange ventilation device, characterized in that: A heat exchange element according to any one of claims 1 to 5, and a housing for accommodating the heat exchange element therein, An air supply passage for supplying outdoor air to the room and an air exhaust passage for exhausting indoor air to the outside are formed inside the casing.

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