KR20130016586A - Heat exchanger for exhaust-heat recovery - Google Patents

Abstract

PURPOSE: A heat exchanger for an exhaust-heat retrieval is provided to improve a heat exchange efficiency by generating an air turbulence which disturbs a flow when air supply and ventilation by a fluid path of a serpentine. CONSTITUTION: A heat exchanger for an exhaust-heat retrieval comprises a first heating plate(10), a second heating plate(20), a heat exchanger(30), and input/output part(40). The first and the second heating plate are laminated to the upper and the lower to the hexagonal shape. The heat exchanger is mounted at the center of the first heating plate and the second heating plate and is a square planar shape. The heat exchanger comprises the upper projection which is protruded to the top and the lower projection which is protruded to the lower part. The input part has a triangle shape which is symmetrical to both sides of the heat exchanger. The input part has inlet and outlet(50) for exhaust and inflow of the air supply and the ventilation.

Description

Heat exchanger for exhaust heat recovery {HEAT EXCHANGER FOR EXHAUST-HEAT RECOVERY}

The present invention relates to a heat exchanger for recovering the exhaust heat contained in the exhaust by heat-exchanging the supply and exhaust, more specifically, the turbulence generated by disturbing the flow during the supply and exhaust by meandering flow path to generate heat exchange efficiency The present invention relates to a heat exchanger for exhaust heat recovery, which improves the pressure loss, reduces the pressure loss, facilitates the discharge of condensate, and minimizes the clogging of the flow path due to contamination.

An air conditioner is installed in a building, a school, a hospital, and a theater used by many people to keep indoor air pleasant and clean at all times, and the air conditioner supplies heating or cooling air inside the building.

At this time, the air conditioner circulates inside the building and introduces fresh outside air while discharging a part of the returned air to the outside of the building. In this process, the heated or cooled air is discharged to the outside in order to maintain a comfortable indoor temperature, It is necessary to supply the heat to the outside air again or to re-cool the outside air, so that the energy can not be utilized reasonably.

In addition, in the drying process of agricultural and marine products, food, and industrial products, the humidity rises due to the moisture generated during the drying process. Therefore, even when introducing the outside air while discharging the inside air, the heat is not recovered from the inside of the hot air. It is being discharged.

In order to solve this problem, various methods for recovering and reusing heat included in exhaust gas have been proposed. As an example, a heat exchanger for exhaust heat recovery of Patent No. 10-0783616 may be cited.

The heat exchanger of the above patent invention has a plurality of heat exchanger plates having different inlet / outlet formation directions stacked on top of each other, whereby indoor and outdoor air flows between the heat exchanger plates of each layer so that heat exchange is performed between indoor and outdoor air in the process. will be.

However, the heat exchanger having the above-described structure has a flat surface of the heat exchanger plates constituting different layers, so that the surface area of the heat exchanger plate which is in contact with the indoor and outdoor air decreases the heat exchange efficiency. There is a problem that the heat exchange efficiency is low because it flows.

In addition, the air flowing on the heat transfer plate of the upper and lower layers forms a boundary layer on the surface of the heat transfer plate, and this boundary layer continues to grow along the air flow direction, in which case the efficiency of the heat exchanger is further lowered.

As a technique for solving the problems in the prior art, "exhaust heat recovery heat exchanger" (Korean Patent Publication No. 10-0991946) has been published.

The technique is to improve the heat exchange efficiency, and to improve the heat exchange efficiency by forming a meandering flow path in the wave-shaped cross section on the heat transfer plate.

By the way, the flow path presented in the above technique is to take an excessively curved shape to increase the contact area of the air and to form turbulence while preventing the formation of the boundary layer of the air, by forming a wave surface of the ripple shape, etc. As the flow resistance increases, there is a problem that the pressure loss increases as a result.

As a result, it is difficult to discharge the condensate generated during the heat exchange, as well as clogging and contamination of the flow path due to dust.

Accordingly, it is necessary to develop a heat exchanger having excellent heat exchange efficiency while reducing pressure loss and minimizing problems such as blockage and contamination inside the flow path.

KR 10-0783616 (2007.12.03) KR 10-0991946 (2010.10.28)

Exhaust heat recovery heat exchanger of the present invention is to solve the problems occurring in the prior art as described above, the upper projection and the lower projection protruding to the upper portion based on the heat exchange membrane of the entrance and exit alternately, the upper projection The lower and lower protrusions are formed to be in a meandering shape on a plane, and the left and right widths of the boundary where the upper and lower protrusions meet are formed to be smaller than the width of the upper or lower protrusions so that a straight flow path is formed at the center of the flow path. To reduce pressure loss.

That is, by forming a straight flow path in the center of the flow path, it is easy to discharge the condensed water generated during the heat exchange process, and to smoothly discharge the pollutants such as dust, to minimize the internal contamination and clogging phenomenon on the flow path.

In addition, it is to improve the heat exchange efficiency by increasing the disturbance of the flow and the formation of turbulence by deviating one end of each other when the upper projection and the lower projection of the first heat transfer plate and the second heat transfer plate alternately stacked.

In addition, by forming the upper projection and the lower projection to be in the shape of a meandering up and down when viewed from the side, to further increase the disturbance of the flow and the formation of turbulence, and to increase the contact area to improve the heat exchange efficiency. .

In order to solve the technical problem as described above, the exhaust heat recovery heat exchanger of the present invention has a hexagonal shape of the first heat transfer plate and the second heat transfer plate alternately stacked up and down, and the first heat transfer plate and the second heat transfer plate have a rectangular planar shape at the center thereof. It consists of a heat exchanger having a heat exchanger and a triangular shape inlet / outlet which is formed symmetrically on both sides of the heat exchanger. Inlet and outlet for the inlet and outlet of the exhaust is formed, the edge of the remaining edge except for the side on which the inlet and outlet is formed is sealed by the coupling protrusion and the coupling groove corresponding to each other, the entrance and exit of the first heat transfer plate and the second heat transfer plate In the heat exchanger is formed with a plurality of guide projections protruding from the inlet and outlet toward the heat exchanger, the first heat transfer plate And a heat exchange part of the second heat exchanger plate, the upper protrusion part protruding upwardly and the lower protrusion protruding downwardly having the same width, are alternately formed on the basis of the heat exchange membrane of the entrance and exit part, and the upper protrusion part and the lower protrusion part connect the input and output parts of both sides. The imaginary line connecting the entry and exit portions of both sides is formed continuously while taking a meandering shape from the plane to the left and right in the direction of the plane. It is formed smaller, the upper projection and the lower projection is formed continuously in the form of meandering up and down on the side in the direction connecting the entry and exit of both sides, wherein the first heat transfer plate and the second heat transfer plate of the first heat transfer plate The lower protrusions are stacked up and down in such a manner that the upper protrusions of the second heat transfer plate are in contact with each other, The upper and lower projections of the second heat exchanger plate form a meandering shape in the direction intersecting with the upper and lower protrusions of the second heat transfer plate so that the cross-sectional shape in some sections is lower than the end of the upper protrusion of the second heat transfer plate. It is characterized by being formed to be shifted so as to further protrude.

At this time, the meandering imaginary line on the side connecting the entry and exit portions on both sides of the boundary where the upper protrusion and the lower protrusion meet each other has a meandering waveform height smaller than the vertical interval between the upper protrusions and the vertical interval between the lower protrusions. It is characterized by being formed.

In addition, the lowermost end of the lower protrusion of the first heat transfer plate and the uppermost end of the second heat transfer plate upper protrusion in contact with each other are formed in a meandering shape from side to side in a direction connecting the upper protrusion and the lower protrusion to the entrance portions of both sides. It is characterized by that.

In addition, the upper protrusion and the lower protrusion is characterized in that the cross-sectional shape in the direction connecting the entry and exit of both sides of the cross-section each has a rectangular shape.

In addition, an arc-shaped auxiliary groove is formed at the distal end of the coupling protrusion formed at the edge of the first heat transfer plate and the second heat transfer plate in the opposite direction to the coupling protrusion, and the packing of the cylindrical cross section is installed in the auxiliary groove. It features.

At this time, the guide projection is characterized in that it takes a meandering shape on the plane and side.

In addition, between the guide projections, characterized in that the auxiliary projection having a meandering shape on the plane and side are formed.

According to the present invention, the upper protrusion and the lower protrusion protruding upward are formed alternately based on the heat exchange membrane of the entrance and exit, and the upper and lower protrusions are formed to be meandering in plan view. The width of the left and right portions of the boundary where the upper protrusion and the lower protrusion meet is smaller than the width of the upper protrusion or the lower protrusion, thereby forming a linear flow path in the center of the flow path, thereby reducing the pressure loss.

That is, by forming a straight flow path in the center of the flow path is easy to discharge the condensate generated during the heat exchange process, it is possible to minimize the internal contamination and clogging phenomenon such as dust.

In addition, the upper and lower protrusions of the first and second heat exchangers stacked alternately contact each other so that one end thereof is shifted from each other, thereby increasing the disturbance of the flow and the formation of turbulent flow, thereby improving heat exchange efficiency.

In addition, the upper and lower protrusions are also formed to be in a meandering shape when viewed from the side to further increase the disturbance of the flow and the formation of turbulence, and increase the contact area to improve heat exchange efficiency.

1 is a perspective view showing a heat exchanger for exhaust heat recovery of the present invention.
Figure 2 is a perspective view of the first heat transfer plate in the present invention.
Figure 3 is a perspective view of the second heat transfer plate in the present invention.
Figure 4 is an exploded perspective view showing a heat exchanger for exhaust heat recovery of the present invention.
Figure 5 is a plan view showing a first heat transfer plate in the present invention.
Figure 6 is a plan view showing a second heat transfer plate in the present invention.
7 is a plan view of a state in which the first heat transfer plate and the second heat transfer plate are laminated in the present invention.
8 is a cross-sectional view showing the stacked state of the upper projection and the lower projection in the present invention.
Figure 9 is a side cross-sectional view showing that the upper projection and the lower projection is formed meandering when viewed from the side in the present invention.
10 is a cross-sectional view showing an example in which the packing is installed between the coupling protrusion and the coupling groove in the present invention.
Figure 11 is a plan view showing an example in which the guide projection is formed meandering in the present invention.

Exhaust heat recovery heat exchanger of the present invention is configured by alternately stacked up and down the first heat transfer plate 10 and the second heat transfer plate 20 of the hexagonal shape as shown in FIGS.

The first heat exchanger plate 10 and the second heat exchanger plate 20 each have a heat exchanger 30 having a rectangular planar shape at the center and a triangular-shaped entry and exit unit that is formed symmetrically on both sides of the heat exchanger 30. It consists of 40.

In addition, the inlet and outlet 50 for inlet and outlet of supply / exhaust on one side of each of the inlet and outlet parts 40 on both sides of the heat exchanger 30 in a state in which the first heat exchanger plate 10 and the second heat exchanger plate 20 are stacked. Is formed.

In addition, as shown in FIG. 4, the edges of the other edges except for the side on which the entrance and exit ports 50 are formed are stacked to be sealed by the coupling protrusions 60 and the coupling grooves 61 corresponding to each other.

In addition, a plurality of guide protrusions 70 protruding from the inlet and outlet 50 toward the heat exchanger 30 are formed in the inlet and outlet portions 40 of the first heat exchanger plate 10 and the second heat transfer plate 20.

Such a configuration will be similar to that of a known heat exchanger.

Hereinafter, the characteristic configuration of the heat exchanger for exhaust heat recovery of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, the heat exchanger 30 of the first heat transfer plate 10 and the second heat transfer plate 20 protrudes upward from the upper protrusion 80 and protrudes upward based on the heat exchange film of the entry and exit 40 as shown. Lower protrusions 90 are alternately formed with the same width.

The upper protrusion 80 and the lower protrusion 90 preferably have a cross-sectional shape in a direction connecting the entry and exit portions 40 on both sides of the cross section, respectively, to increase the heat exchange area.

At this time, the upper projection portion 80 and the lower projection portion 90 is formed in succession while taking a meandering shape from side to side in a plane connecting the entry and exit portions 40 on both sides, the upper projection portion 80 and the lower projection portion The virtual line 100 on the plane where the boundary where the 90 meets connects the entry and exit portions 40 on both sides has a left and right width, that is, the width b of the boundary portion is smaller than the width a of the upper and lower protrusion portions. It is.

That is, it shows that the air supply and exhaust passing through the flow path formed by the upper protrusion 80 and the lower protrusion 90 can move in a straight line.

In addition, the upper protrusion 80 and the lower protrusion 90 are continuously formed while taking a meandering shape on the side in the direction connecting the entry and exit portions 40 on both sides.

2 and 3 show the detailed structures of the first heat transfer plate 10 and the second heat transfer plate 20, respectively.

In the drawing, the upper part of the enlarged figure is a side cross-sectional view where the first heat transfer plate 10 and the second heat transfer plate 20 are stacked, and the lower part of the enlarged figure is a plan view of the first heat transfer plate 10 and the second heat transfer plate 20. to be.

As can be seen in each drawing, the upper and lower protrusions 80 and 90 formed alternately from one entry and exit portion 40 toward the other entry and exit portion 40 take a meandering shape from side to side on a plane. In terms of side view, it also takes a meandering step up and down.

Taking a meandering plane in plan view, the air supply and exhaust passing through the respective air supply and exhaust passage 110 formed by the upper projection 80 and the lower projection 90 as shown in Figures 5 and 6 in a straight line You can see the width narrowed down to move.

Meanwhile, as shown in FIG. 7, the first heat transfer plate 10 and the second heat transfer plate 20 are stacked in such a manner that the lower protrusion 91 of the first heat transfer plate contacts the upper protrusion 82 of the second heat transfer plate. Stacked up and down, each end of the upper projection 82 of the second heat transfer plate and the lower projection 91 of the first heat transfer plate is characterized in that the protruding alternately shifted.

8 illustrates this configuration in more detail.

Specifically, the lower protrusion 91 of the first heat transfer plate and the upper protrusion 82 of the second heat transfer plate are in contact with each other, and both ends of the lower protrusion 91 of the first heat transfer plate are both ends of the upper protrusion 82 of the second heat transfer plate. It turns out that it arrange | positions to the right side rather than contacting with it.

As such, the lower protrusion 91 of the first heat exchanger plate and the upper protrusion 82 of the second heat exchanger plate are disposed to be offset from each other, such that the supply and exhaust passage between the upper protrusion 81 of the first heat exchanger plate and the lower protrusion 92 of the second heat transfer plate is different. The cross-sectional shape of the (110) is not a simple rectangular shape but takes a deformed shape, in the lower corner of the upper protrusion 81 of the first heat transfer plate and the upper edge of the lower protrusion 92 of the second heat transfer plate and disturbance of flow The second turbulence forming unit 113 for generating turbulence is formed to improve heat exchange efficiency.

In the present invention configured as described above, the planar shape in which the first heat transfer plate 10 and the second heat transfer plate 20 are stacked on each other is illustrated in FIG. 7.

Referring to the drawings, the upper protrusions 81 and the lower protrusions 91 of the first heat transfer plate 10 are alternately formed in a meandering shape on a plane, and the second heat transfer plate 20 also has an upper protrusion 82 and a lower portion. It can be seen that the protrusions 92 are alternately formed taking a meandering shape on a plane.

In addition, the upper protrusion 81 and the lower protrusion 91 of the first heat transfer plate 10 may have a meandering shape in a direction crossing the upper protrusion 82 and the lower protrusion 92 of the second heat transfer plate 20. By forming the cross-sectional shape in some sections, it can be seen that the end of the lower protrusion 91 of the first heat transfer plate 10 is shifted so as to protrude more than the end of the upper protrusion 82 of the second heat transfer plate 20.

Accordingly, in the air supply and exhaust passage 110 between the upper protrusion 81 of the first heat transfer plate and the lower protrusion 92 of the second heat transfer plate, the straight portion 111 connecting the two entry and exit portions 40 in a straight line forms a central portion of the flow path. The upper projections 80 and the lower projections 90 themselves of the first heat transfer plate 10 and the second heat transfer plate 20 take a meandering shape, and thus the first heat transfer plate 10 and the first heat transfer plate 10 are formed at predetermined intervals on both sides of the straight portion 111. The turbulence forming unit 112 is formed.

In addition, the upper protrusion 81 and the lower protrusion 91 of the first heat transfer plate 10 are staggered in opposite directions while staggered from the upper protrusion 82 and the lower protrusion 92 of the second heat transfer plate 20. As a result, as shown in FIG. 7, the shape of the supply / exhaust passage 110 is distorted, thereby forming a second turbulence forming unit 113 that does not form a straight line and forms turbulence.

The heat exchanger for exhaust heat recovery of the present invention configured as described above has an air supply / exhaust passage 110 formed between the upper protrusion 81 of the first heat transfer plate and the lower protrusion 92 of the second heat transfer plate in plan view. ), A straight portion 111 connecting the entry and exit portions 40 on both sides is formed, and both sides of the straight portion 111 are formed as the upper protrusion 80 and the lower protrusion 90 take a planar meandering shape. The first turbulence forming part 112 is formed therein, and the upper projections 81 and 82 and the lower projections 91 and 92 of the first heat transfer plate 10 and the second heat transfer plate 20 cross each other to take a meandering shape. Due to this, the second turbulence forming unit 113 is formed on the side of the supply / exhaust passage 110.

In addition, the upper protrusion 80 and the lower protrusion 90 have a meandering shape up and down again when viewed from the side, so that the upper and lower portions of the upper and lower portions of the straight line 111 of the exhaust passage 110 are again flown. A third turbulence forming portion that forms disturbances and turbulence is formed.

That is, the exhaust heat recovery heat exchanger of the present invention takes a straight line connecting the inlet and outlet portions 40 on both sides of the supply and exhaust passage 110, and the third turbulence forming portion 114 is formed on the upper and lower portions thereof, The first turbulence forming portion 112 is formed, and the second turbulence forming portion 113 is formed in the side central lower portion and the side central upper portion to maximize the disturbance of the flow and the formation of the turbulence.

In the present invention configured as described above, an imaginary line having a meandering shape on the side connecting the entry and exit portions 40 on both sides of the boundary portion where the upper projection portion 80 and the lower projection portion 90 meet is shown in FIGS. 2 and 3. As shown, the meandering wave height c is formed to be smaller than the vertical gap d between each upper protrusion or the vertical gap d between each lower protrusion, so that the center of the air supply / exhaust passage 110 is located at both sides of the entry and exit portions ( It is desirable to be able to connect 40) in a straight line.

In addition, the lower end of the lower projection 91 of the first heat transfer plate as the upper projection 80 and the lower projection 90 in the form of meandering up and down on the side in the direction connecting the entry and exit portion 40 of both sides and The upper end of the upper protrusion 82 of the second heat transfer plate is preferably formed to be in contact with each other as shown in FIG.

In addition, an arc-shaped auxiliary groove 62 is formed in a direction opposite to the coupling protrusion 60 at the tip of the coupling protrusion 60 formed at the edge of the first heat transfer plate 10 and the second heat transfer plate 20. The auxiliary groove 62 may have a packing 63 having a cylindrical cross section.

The packing is provided to facilitate the disassembly and assembly of the heat transfer plate while maintaining the airtightness when the first heat transfer plate 10 and the second heat transfer plate 20 are formed of a metal material instead of the vacuum forming method of the resin film.

Exhaust heat recovery heat exchanger of the present invention configured as described above so that each of the supply and exhaust passages 110 formed by alternately stacking the first heat transfer plate 10 and the second heat transfer plate 20 can be directly directed to the center portion in a straight line. Therefore, the pressure loss is increased due to the excessively formed zigzag flow path in the related art, it is difficult to discharge the condensed water generated during the heat exchange process, it is difficult to clean the internal contamination by dust, etc., and the phenomenon occurs that the internal flow path is clogged. The problem can be solved, and the heat exchange efficiency can be improved by turbulence being formed by variously disturbing the flow in the upper, lower, side, and lateral center portions of the straight portion 111.

On the other hand, as shown in Figure 11 in the present invention configured as described above, the guide protrusion 70 may be configured to take a meandering shape on the plane, or to take a meandering shape on the side to further improve the heat exchange efficiency. It may be.

In addition, the auxiliary projections 71 having a meandering shape on the plane and side surfaces are formed between the guide projections 70, and the auxiliary projections 71 extend with the upper projections 80 and the lower projections 90. It may be configured to further improve the heat exchange efficiency.

10: first heat transfer plate 20: second heat transfer plate
30: heat exchanger 40: entry and exit
50: inlet and outlet 60: engaging projection
61: coupling groove 62: auxiliary groove
63: Packing 70: Guide protrusion
80: upper protrusion
81: upper projection of the first heat transfer plate
82: upper protrusion of the second heat transfer plate
90: lower protrusion
91: lower projection of the first heat transfer plate
92: lower protrusion of the second heat transfer plate
100: a virtual line on a plane where the boundary portion where the upper protrusion 80 and the lower protrusion 90 meet connects the entry and exit portions 40 on both sides
a: width of border
b: width of upper projection and lower projection
101: an imaginary line in a meandering shape on the side at which the boundary portion where the upper protrusion portion 80 and the lower protrusion portion 90 meet connect the entry and exit portions 40 on both sides.
c: waveform height
d: vertical gap between each upper projection or vertical gap between each lower projection
110: supply and exhaust passage 111: straight part
112: first turbulence forming unit 113: second turbulence forming unit
114: third turbulence forming unit

Claims (7)

The first heat transfer plate 10 and the second heat transfer plate 20 having a hexagonal shape are alternately stacked up and down, and the first heat transfer plate 10 and the second heat transfer plate 20 have a rectangular planar shape at the center thereof. ) And a triangular shape entry and exit unit 40 formed on both sides of the heat exchange unit 30 to be symmetrical with each other, and the heat exchange unit in a state where the first heat transfer plate 10 and the second heat transfer plate 20 are stacked. (30) The inlet and outlet portions 40 on each side are formed with inlets and outlets 50 for inlet and outlet air supply and exhaust on one side, respectively, and the edges of the remaining edges except for the side on which the inlet and outlet 50 are formed. It is sealed by the corresponding coupling protrusion 60 and the coupling groove 61, the inlet and outlet portion 40 of the first heat transfer plate 10 and the second heat transfer plate 20 from the inlet and outlet 50 to the heat exchanger 30 In the heat exchanger is formed to protrude a plurality of guide projections 70,
The heat exchange part 30 of the first heat transfer plate 10 and the second heat transfer plate 20,
The upper protrusion part 80 protruding upward and the lower protrusion part 90 protruding downward are formed alternately with the same width, and the upper protrusion part 80 and the lower protrusion part ( 90 is formed continuously while taking a meandering shape in a plane from side to side in a direction connecting the entry and exit portions 40 on both sides, and the boundary portion where the upper projection 80 and the lower projection 90 meet each other The imaginary line on the plane connecting the 40 is formed with a left and right width smaller than the width of the upper protrusion 80 and the lower protrusion 90,
The upper protrusion part 80 and the lower protrusion part 90 are continuously formed while taking a meander shape from side to side in a direction connecting the entry and exit parts 40 on both sides,
The first heat transfer plate 10 and the second heat transfer plate 20 are stacked up and down in such a manner that the lower protrusion 91 of the first heat transfer plate is in contact with the upper protrusion 82 of the second heat transfer plate.
The upper protrusion 81 and the lower protrusion 91 of the first heat transfer plate 10 in a plane form a meandering phase in a direction crossing each other with the upper protrusion 82 and the lower protrusion 92 of the second heat transfer plate 20. The cross-sectional shape in some sections is characterized in that the end of the lower protrusion 91 of the first heat transfer plate and the end of the upper protrusion 82 of the second heat transfer plate are shifted from each other,
Heat exchanger for exhaust heat recovery.
The method of claim 1,
The imaginary line of the meandering shape on the side where the boundary portion where the upper protrusion 80 and the lower protrusion 90 meet connects the entry and exit portions 40 on both sides has a meandering waveform height of the vertical interval between the upper protrusions, or respectively. Characterized in that less than the vertical gap between the lower projection of the,
Heat exchanger for exhaust heat recovery.
The method of claim 2,
The lowermost end of the lower protrusion 91 of the first heat transfer plate as the upper protrusion 80 and the lower protrusion 90 take a meandering shape from side to side in a direction connecting the entry and exit portions 40 on both sides; Characterized in that the upper end of the upper projection 82 of the two heat transfer plates are formed to contact each other,
Heat exchanger for exhaust heat recovery.
The method of claim 3, wherein
The upper projection portion 80 and the lower projection portion 90 is characterized in that the cross-sectional shape in the direction connecting the entry and exit portion 40 on both sides of the cross-section, each having a rectangular shape,
Heat exchanger for exhaust heat recovery.
The method of claim 1,
An arc-shaped auxiliary groove 62 is formed at the distal end of the coupling protrusion 60 formed at the edge of the first heat transfer plate 10 and the second heat transfer plate 20 in the opposite direction to the coupling protrusion 60.
The auxiliary groove 62 is characterized in that the packing 63 of the cylindrical cross section is installed,
Heat exchanger for exhaust heat recovery.
The method of claim 1,
The guide protrusion 70 is characterized in that it takes a meandering shape,
Heat exchanger for exhaust heat recovery.
The method according to any one of claims 1 to 6,
Between each of the guide protrusions 70 is characterized in that the auxiliary projections 71 are formed to take a meandering shape,
Heat exchanger for exhaust heat recovery.

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