JP2011043318A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently carry out heat exchange with a second fluid in a heat exchanger passing the second fluid in an axial direction of a heat transfer tube to carry out heat exchange with a first fluid. <P>SOLUTION: The heat exchanger is formed with a plurality of first headers 2L provided in one side of a plurality of heat transfer tubes 3 with each respectively having a gap 26 in a vertical direction, a plurality of second headers 2R provided in another side of the plurality of heat transfer tubes 3 with each respectively having a gap 26 in the vertical direction, and a second fluid passage 27 passing the second fluid 7 from a side of one header 2 in the axial direction of the heat transfer tubes 3 through the gaps 26 and discharging the second fluid 7 to a side of another header 2. The second fluid is passed via the second fluid passage 27 formed by the gaps 26, and the second fluid is evenly passed along outer peripheries of the heat transfer tubes 3 along the axial direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat exchanger in which a second fluid is allowed to flow through the outer periphery of a first fluid flowing in a plurality of heat transfer tubes so that heat exchange with the first fluid can be performed. The present invention relates to a heat exchanger in which the efficiency of heat exchange is improved by flowing two fluids.

  Conventionally, a multi-pass heat exchanger having a structure as shown in FIG. 6 is known (for example, Patent Document 1). The heat exchanger of FIG. 6 will be described in detail. Reference numeral 201 denotes a fin, which is provided in a direction perpendicular to the axial direction of the plurality of heat transfer tubes 202. In general, a plurality of fins 201 are provided at regular intervals. In FIG. 6, only both end portions are illustrated. Reference numeral 202 denotes a heat transfer tube in which a refrigerant to be cooled is circulated. Reference numeral 203 denotes headers provided at both ends of the heat transfer tube 202. A plurality of partition plates 204 are provided inside the header 203, the flow direction of the refrigerant is regulated by the partition plates 204, and the refrigerant flowing from one heat transfer tube 202 flows to the other heat transfer tube 202. I am doing so.

  When cooling the refrigerant using such a multi-pass heat exchanger, first, the refrigerant is caused to flow from the uppermost heat transfer tube 202. Then, the refrigerant flows through the heat transfer pipe 202 through the inflow space of the left header 203 and flows into the partition space 205 of the right header 203. Then, the refrigerant that has flowed into the partition space 205 of the header 203 flows into the other heat transfer pipe 202 joined to the same partition space 205, and similarly flows to the partition space 205 of the left header 203. Hereinafter, similarly, the refrigerant is caused to flow so as to meander the left header 203 and the right header 203. On the other hand, when air is caused to flow along the fins 201 provided in a direction perpendicular to the heat transfer tubes 202, heat exchange is performed between the air and the surfaces of the fins 201 and the heat transfer tubes 202. The refrigerant flowing through can be cooled.

  As another heat exchanger, as shown in FIG. 8, an apparatus has been proposed in which air is passed through the outer peripheral portion along the axial direction of the heat transfer tube to perform heat exchange (Patent Document 2). In detail, in FIG. 8, reference numeral 210 denotes a header provided on the left and right, and reference numeral 211 denotes a heat transfer tube provided between the left and right headers. The heat transfer tube 211 is provided with an outer tube 212 at the center thereof, and a fin (not shown) is provided between the outer tube and a heat diffusion is performed. On the other hand, reference numeral 213 is a chamber partitioned between the left and right headers, and allows air to pass from the inlet 214 to the outlet 215. And when cooling the 1st fluid 6 using such a heat exchanger, the 1st fluid 6 is made to flow in from one header 210L, and is made to flow out to the other header 210R side via the heat exchanger tube 211. On the other hand, at the same time, air as the second fluid 7 is introduced from the inlet 214 of the chamber 213, heat exchange is performed through fins provided between the outer pipe 212 and the air is discharged from the outlet 215. .

JP 2004-108601 A Japanese Patent Laid-Open No. 07-133993

  However, these conventional heat exchangers cause the following problems. That is, in the multi-pass heat exchanger as shown in FIG. 6, heat exchange is performed with the refrigerant through the air in a direction perpendicular to the axial direction of the heat transfer tube. In such a method, the heat transfer tube 202 is used. When the size of the heat transfer tube 202 is reduced by reducing the clearance between the heat transfer tube 202 and the heat transfer tube 202, a vortex or turbulent flow is generated in the gap 206 between the heat transfer tube 202 and the heat transfer tube 202 as shown in FIG. There was a problem that heat could not be exchanged well due to retention.

  In addition, as shown in FIG. 8, when the chamber is provided between the opposing headers and air is introduced from above and air is passed in the axial direction of the heat transfer tube, most of the air introduced from the inflow port. Flows in the direction indicated by the thick solid line in FIG. 8 and causes a problem that heat cannot be exchanged efficiently in other portions (for example, near the wall surface of the chamber).

  Therefore, in order to solve the above-described problems, the present invention enables efficient heat exchange with the second fluid in a heat exchanger that exchanges heat with the first fluid in the tube through the second fluid in the axial direction of the heat transfer tube. An object of the present invention is to provide a heat exchanger.

  That is, in order to solve the above-mentioned problem, the present invention provides a heat transfer tube for passing a first fluid to be subjected to heat exchange, and a first fluid that is provided at both left and right ends of the heat transfer tube and passed through one heat transfer tube. A heat exchanger that exchanges heat with the first fluid in the heat transfer tube through the second fluid to the outer peripheral portion of the heat transfer tube, and one side of the plurality of heat transfer tubes. A plurality of first headers each provided with a gap in the vertical direction, and a plurality of second headers connected to the other side of the plurality of heat transfer tubes, each provided with a gap in the vertical direction, A second fluid flow passage is formed in which the second fluid is passed in the axial direction of the heat transfer tube through the gap of the one header and the second fluid is discharged through the gap of the other header. .

  In this way, since the second fluid can flow from the gap between the top and bottom of the header, the second fluid can be uniformly passed through the outer periphery of all the heat transfer tubes, and the efficiency of heat exchange can be improved. Will be able to.

  Further, in such an invention, when the first header and the second header provided on the left and right are viewed from the left and right directions, the first header and the second header are provided so as to have a gap in the vertical direction.

  In this way, as shown in FIG. 1, the second fluid flow passage can be formed in parallel with the straight line passing through the overlapping gap between the left and right headers, and the second fluid flows smoothly to exchange heat. Efficiency can be improved.

  Further, the first header and the second header provided on the left and right sides have a vertical gap when viewed from the left and right direction, and the straight pipe portions of the heat transfer tubes connected to the headers are Provide a straight line parallel to the gap.

  In this way, as shown in FIG. 1, by positioning most of the heat transfer tubes in the gap, the contact area with the second fluid passing between them can be increased, and the efficiency of heat exchange can be further increased. Can be improved.

  Moreover, it is also possible to arrange such heat exchangers so as to be symmetrically overlapped. That is, it is connected to one side of the plurality of heat transfer tubes, and is connected to the other side of the plurality of heat transfer tubes and has a plurality of first headers provided so as to have a gap between the upper and lower sides, and has a gap between the upper and lower sides. And a plurality of third headers provided at the same height as the first head and provided with gaps between the upper and lower sides on the other side of the plurality of heat transfer tubes. A header, and a plurality of fourth headers provided at the same height as the second head so as to have a gap between the upper and lower sides, and provided with a gap between the upper and lower sides, respectively. The first fluid is passed so as to meander sequentially between the header and the second header, and the first fluid is passed so as to meander sequentially between the third header and the fourth header. Through The second fluid circulating from the left and right sides of the header in the axial direction of the heat transfer tube.

  In this way, heat can be exchanged uniformly through the second fluid using the gap between the headers, and the first fluid can be passed through the first header and the third header. Will be able to.

  In addition, a corrugated heat diffusion plate that fits within the gap width between the top and bottom of the header is attached to the outer peripheral portion of the plurality of heat transfer tubes.

  In this way, since the heat diffusion plate can be attached after attaching the header and the heat transfer tube, the manufacturing process can be simplified, and the heat diffusion plate is located in the gap through which the second fluid passes. Further, the efficiency of heat exchange can be improved.

  According to the present invention, the heat transfer pipe that passes the first fluid to be heat exchanged, and the first fluid that is provided at the left and right ends of the heat transfer pipe and passed through the one heat transfer pipe are folded back to the other heat transfer pipe. A heat exchanger that exchanges heat with the first fluid in the heat transfer tube through the second fluid through the outer peripheral portion of the heat transfer tube, and is connected to one side of the plurality of heat transfer tubes, A plurality of first headers provided with gaps, a plurality of second headers connected to the other side of the plurality of heat transfer tubes, each provided with a gap in the vertical direction, and the gaps of the one header A second fluid flow passage is formed through which the second fluid is passed in the axial direction of the heat transfer tube and the second fluid is discharged through the gap of the other header. Flow two fluids to the outer periphery of all heat transfer tubes. Be passed through the second fluid can be, it is possible to improve the efficiency of heat exchange.

Schematic front view of a heat exchanger showing an embodiment of the present invention Schematic diagram of the vicinity of the header in the same form Side schematic diagram in the same form Sectional view of the header in the same form The figure which shows the heat exchanger in other embodiment Diagram showing a conventional multi-pass heat exchanger The figure which shows the flow state at the time of letting the fluid pass in the direction perpendicular | vertical to a pipe | tube in FIG. The figure which shows the heat exchanger which flows a 2nd fluid to the axial direction of the conventional heat exchanger tube

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The heat exchanger 1 according to the present embodiment includes a plurality of headers 2 provided alternately on the left and right, and a plurality of heat transfer tubes 3 connected between the left and right headers 2. A gap 26 is formed between the upper and lower sides of each header 2 (2L, 2R) on the right side and the left side, and the heat transfer tube 3 is arranged in the second fluid flow passage 27 passing through the gap 26 of the header 2. is there. And by comprising in this way, when the 2nd fluid 7 is passed through the gap | interval 26 from the side of one header 2, the 2nd fluid 7 is made uniform along the axial direction of all the heat exchanger tubes 3. The contact is made to improve the efficiency of heat exchange. Hereinafter, the configuration of the heat exchanger 1 in the present embodiment will be described in detail.

  The heat transfer tube 3 of the heat exchanger 1 is constituted by an extremely thin circular tube so that the high-pressure first fluid 6 can pass through, for example, an outer diameter of about 1 mm and an inner diameter of 0.5 mm. Consists of a metal member of a degree. As shown in FIG. 2, a plurality of the heat transfer tubes 3 are attached to a single header 2 at regular intervals. For example, a bent portion 31 is connected to the first header 2L side, and left and right from there. A straight pipe portion 32 that passes through the straight second fluid flow passage 27 formed by the gap between the headers 2 is formed, and a bent portion 31 is provided on the tip side thereof to be connected to the second header 2R. ing. When attaching these heat transfer tubes 3 to the header 2, the bending direction of the other heat transfer tubes 3 adjacent in the same header 2 is made different. For example, when the heat transfer tube 3 on the front side is bent downward, Then, the heat transfer tube 3 on the depth side adjacent thereto is bent upward. Thereby, the clearance gap W between the bending part 31 and the bending part 31 of the heat exchanger tube 3 which adjoins every other line is enlarged, and it is easy to let the 2nd fluid 7 pass through there.

  The headers 2 connected to both ends of the heat transfer tube 3 are configured so that the first fluid 6 flowing in from one heat transfer tube 3 is folded back to the other heat transfer tubes 3. A plurality are provided. That is, first, when the first fluid 6 is caused to flow from the first header 2L on the upper left side, the first fluid 6 is caused to flow into the second header 2R on the right side through the heat transfer tube 3 there. The first fluid 6 is folded by the two headers 2R, and the first fluid 6 is caused to flow into the heat transfer tube 3 below the first fluid 6. Then, it flows into the lower first header 2L provided with a predetermined gap 26 from the previous first header 2L, and similarly, the first fluid 6 is folded back by the first header 2L to transmit the lower side thereof. The first fluid 6 is caused to flow into the heat pipe 3. Similarly, the heat transfer tube 3 and the first header 2L or the second header 2R are meandered by flowing into the second header 2R provided with a predetermined gap 26 from the second header 2R. Thus, the first fluid 6 is finally discharged from the discharge port 25 of the second header 2R on the lower right side through the first fluid 6.

  The header 2 is configured not to provide a partition for turning back the first fluid 6 flowing in the heat transfer tube 3, and bends the first fluid 6 flowing in from the one heat transfer tube 3 downward. It passes through one of the other heat transfer tubes 3. That is, it is made to flow in one of the heat transfer tubes 3 bent to the lower side where no pressure is applied by the pressure of the first fluid 6 flowed from above.

  By the way, when letting the 1st fluid 6 flow in into such a header 2, if the wall surface of the back of the header 2 is at right angles with respect to an inflow direction, the 1st fluid 6 will bounce there and the inflow amount will be restrict | limited. Moreover, since it is necessary to flow in the 1st fluid 6 which flowed in from the other heat exchanger tube 3 of the both sides of the heat exchanger tube 3, it is preferable to release the 1st fluid 6 toward the both sides. Therefore, in this embodiment, as shown in FIG. 4, the header 2 is configured so that the vertical width is gradually narrowed toward the folding point 23, whereby the first fluid 6 is placed at the folding point 23 of the header 2. Branches efficiently toward both sides in the longitudinal direction. That is, when the first fluid 6 flows into the header 2 from one heat transfer tube 3, the first fluid 6 moves toward the turning point 23 along the inclined upper wall 21 and lower wall 22 of the header 2, and at the tip. The pressure increases as you go. When the first fluid 6 gathers at the turn-back point 23, the first fluid 6 that has gone out of place branches along the left-right axis of the turn-back point 23 (that is, the longitudinal direction of the header 2) due to the pressure (see FIG. 4 (b)) and flows into another heat transfer tube 3 adjacent thereto. At this time, since the heat transfer tubes 3 are arranged at equal intervals with respect to the header 2, the inlets of the other heat transfer tubes 3 are located at positions where the first fluid 6 branched from the left and right collides. The first fluid 6 can smoothly flow into the heat transfer tube 3. When the header 2 having such a shape is formed, a thin metal plate is bent and the front portion and the side portion to which the heat transfer tube 3 is connected are processed by welding.

  When the header 2 and the heat transfer tube 3 are provided as described above, the gap 26 between the header 2 and the header 2 provided in the vertical direction, the positions of the second fluid flow path 27 and the heat transfer tube 3 formed by the gap 26, and the like. The relationship is set as follows:

  That is, with respect to the gap 26 in the vertical direction of the first header 2L, as seen from the direction in which the header 2 exists (that is, the left side or the right side in FIG. 1), as shown in FIG. The second header 2R is accommodated between the second header 2L and the lower first header 2L, and the straight tube portion 32 of the heat transfer tube 3 is positioned between the second header 2R and the upper first header 2L, Further, the straight tube portion 32 of the heat transfer tube 3 is also positioned between the second header 2R and the lower first header 2L. In this way, a straight second fluid flow passage 27 can be formed by overlapping the gap 26 between the upper and lower sides of the first header 2L and the gap 26 between the upper and lower sides of the second header 2R. Thus, the straight pipe portion 32 and the second fluid 7 provided in parallel in the second fluid flow passage 27 penetrating in a straight line can be efficiently brought into contact with each other. When the second fluid 7 is introduced from the gap 26 of the header 2 in this way, the second fluid 7 becomes turbulent on the downstream side of the bent portion 31 of the heat transfer tube 3, but as shown in FIG. Since the second fluid 7 can be caused to flow in from the large gap W between the heat transfer tubes 3 provided every other line, heat exchange is promoted also on the downstream side of the bent portion 31 by the second fluid 7 flowing in a large amount from here. be able to.

  Further, a corrugated plate-like heat diffusion plate 4 is attached to the straight tube portion 32 of the heat transfer tube 3 provided in the gap 26 of the header 2 between the upper and lower sides. The heat diffusion plate 4 diffuses heat conducted through the heat transfer tube 3 to increase the contact area with the second fluid 7, and is constituted by a metal plate having high heat conductivity. The heat diffusing plate 4 is provided so as to be inserted from the gap 26 between the upper and lower headers 2 and in contact with the outer peripheral portion of the straight tube portion 32. In this embodiment, as shown in FIG. 3, the lower surface of the straight tube portion 32 of the heat transfer tube 3 bent from the first header 2L side and the straight tube portion 32 of the heat transfer tube 3 connected to the second header 2R side. A corrugated plate having concave portions that come into contact with the upper surface of each is inserted into the gap 26 on the first header 2L side and fixed to the heat transfer tube 3, for example.

  Then, the flow for passing the second fluid 7 from the gap 26 between the headers 2 along the axial direction of the heat transfer tube 3 to the first header 2L side or the second header 2R side of the heat exchanger 1 configured as described above. Part 5 is provided. For example, when the second fluid 7 is a gas, the circulation unit 5 is configured by a fan or the like. When the second fluid 7 is circulated through the gaps 26 of the header 2 in the circulation part 5, the second fluid 7 is uniformly passed through all the gaps 26.

  Next, the operation in the heat exchanger 1 configured as described above will be described. For the sake of explanation, the first fluid 6 is a heated fluid to be cooled, and the second fluid 7 is a cold fluid for cooling the heated fluid, thereby cooling the first fluid 6. However, the present invention can be used in the same manner when the cooled fluid is heated.

  First, when cooling the 1st fluid 6 used as cooling object, the 1st fluid 6 is made to flow in from the inflow part of the 1st header 2L of the uppermost left part. Since only the heat transfer tube 3 for allowing the first fluid 6 to flow out is connected to the uppermost first header 2L, the first fluid 6 flows out to the second header 2R side through the heat transfer tube 3. Is done. When the first fluid 6 flows out to the second header 2R side, in the second header 2R, the first fluid 6 is discharged to the back along the upper wall 21 and the lower wall 22 on which the second header 2R is inclined. In a state where the height of the second header 2R is increased, the second header 2R branches on the left and right axis (longitudinal direction). This branching is similarly performed for the first fluids 6 that have flowed out of all the heat transfer tubes 3, whereby the respective branched first fluids 6 meet, that is, the inlets of the heat transfer tubes 3 bent downward. It flows out toward the heat transfer tube 3 side. The first fluid 6 that has passed through the heat transfer tube 3 bent downward is guided to the first header 2L side through the bent portion 31 and the straight tube portion 32 of the heat transfer tube 3, and even in the first header 2L. Similarly, branching of the first fluid 6 and outflow to the other heat transfer tubes 3 are performed. Thereafter, the first fluid 2 is reciprocated between the first header 2L and the second header 2R sequentially so as to meander the first fluid 6 in the same manner, and finally discharged from the discharge port 25 provided in the lowermost second header 2R. Let

  Simultaneously with the circulation of the first fluid 6, the circulation part 5 is operated from the side of the first header 2 </ b> L, and the second fluid 7 is caused to flow from the gap 26 of the first header 2 </ b> L. Then, the second fluid 7 flows toward the gap 26 of the second header 2R, and heat exchange is performed between the outer peripheral portion of the heat transfer tube 3 and the heat diffusion plate 4 while flowing in parallel with the axial direction of the heat transfer tube 3. I do. At this time, in the second fluid 7 circulation part 5 that linearly penetrates from the gap 26 of the first header 2L to the gap 26 of the second header 2R, the second fluid 7 can be passed substantially parallel to the straight pipe part 32. Therefore, heat exchange can be performed particularly efficiently here.

  As described above, according to the above-described embodiment, the heat transfer tube 3 that passes the first fluid 6 to be heat exchanged inward and the left and right ends of the heat transfer tube 3 are passed through the one heat transfer tube 3. And a header 2 that allows the first fluid 6 to flow back into the other heat transfer tube 3, and exchanges heat with the first fluid 6 in the heat transfer tube 3 through the second fluid 7 in the outer peripheral portion of the heat transfer tube 3. In the heat exchanger to be performed, a plurality of first headers 2L provided with gaps 26 in the vertical direction on one side of the plurality of heat transfer tubes 3, and a gap 26 in the vertical direction on the other side of the plurality of heat transfer tubes 3, respectively. A plurality of second headers 2 </ b> R provided from the side of the one header 2, the second fluid 7 is passed in the axial direction of the heat transfer tube 3 through the gap 26 from the side of the one header 2, and to the side of the other header 2. The second fluid flow passage 27 for discharging the second fluid 7 is formed. The second fluid 7 can be linearly passed through the gap 26 between the upper and lower sides of the header 2, and the second fluid 7 can be passed along the outer circumference of all the heat transfer tubes 3 along the axial direction. Efficiency can be improved.

  Also, the first header 2L and the second header 2R provided on the left and right sides are provided so as to have a gap 26 in the vertical direction when viewed from the left and right direction, and the straight pipe portion 32 is provided in the gap 26. Therefore, the efficiency of heat exchange can be further improved in the straight pipe portion 32 by flowing the second fluid 7 smoothly.

  Furthermore, since the corrugated plate-like heat diffusion plate 4 that fits within the gap 26 between the upper and lower sides of the header 2 is attached to the outer peripheral portion of the plurality of heat transfer tubes 3, the heat diffusion plate 4 can be easily attached. The heat diffusing plate 4 can radiate heat.

  In addition, this invention is not limited to the said embodiment, It can implement in a various aspect.

  For example, in the above embodiment, the second header 2R is included in the gap 26 between the upper and lower sides of the first header 2L when viewed from the lateral direction of the first header 2L. May be made narrower. In this case, the second fluid 7 is discharged from the gap 26 on the second header 2R side so as to meander slightly, but heat exchange is performed uniformly through the second fluid 7 along the axial direction of the heat transfer tube 3. If possible, the width of the gap 26 is not limited. In particular, when the heat exchanger 1 is downsized, a narrower one of these gaps 26 may be effective, and the width of the gap 26 may be changed according to the application.

  Moreover, in the said embodiment, although it has comprised so that it may have the bending part 31 and the straight tube part 32 about the heat exchanger tube 3, as shown in FIG. May be crossed diagonally.

  Furthermore, in the above embodiment, the left and right headers 2 have a triangular shape with the left and right sides as vertices, but the second fluid 7 that flows between the left and right headers 2 is removed from the gap 26 between the second headers 2R. When discharging from the second fluid 7, there is a possibility that the second fluid 7 cannot be discharged smoothly. In such a case, a shape such as a rhombus, an ellipse, or a circle may be used so that the second fluid 7 can be easily discharged.

  In addition, in the said embodiment, although the several heat exchanger tube 3 is provided with respect to the one header 2, the one heat exchanger tube 3 is provided in the one header 2, and the header 2 is provided in the axial direction. The second fluid 7 may be allowed to flow from the gap 26.

  Moreover, in the said embodiment, as shown in FIG. 1, the 1st fluid 6 is made to flow in from the upper left side, and it is made to meander sequentially, However, While arrange | positioning 1st header 2L and 2nd header 2R, You may make it arrange | position a 1st head and a 2nd head symmetrically so that it may cross. In this case, the third head is disposed at the same height position as the first header 2L, the fourth head is disposed at the same height position corresponding to the second head 2R, and the heat transfer tube 3 is similarly connected to the third head. And meander between the head and the fourth head.

1 ... heat exchanger 2 ... header (2L first header, 2R second header)
21 ... Upper wall 22 ... Lower wall 23 ... Folding point 24 ... Inlet 25 ... Outlet 26 ... Gap 27 ... Second fluid flow passage 3 ... Heat transfer tube 31 ... Bending part 32 ... Straight pipe part 4 ... Thermal diffusion plate 5 ... Second fluid circulation part 6 ... First fluid 7 ... Second fluid W ... Gap

Claims (5)

A heat transfer tube through which the first fluid to be heat exchanged is passed, and a header that is provided at both left and right ends of the heat transfer tube and flows in the first fluid passed through one heat transfer tube so as to be folded back to the other heat transfer tube. A heat exchanger for exchanging heat with the first fluid in the heat transfer tube through the second fluid through the outer peripheral portion of the heat transfer tube, and connected to one side of the plurality of heat transfer tubes, each provided with a gap in the vertical direction A plurality of first headers, a plurality of second headers connected to the other side of the plurality of heat transfer tubes, each provided with a gap in the vertical direction, and the heat transfer tubes passing through the gaps in the one header. A heat exchanger characterized in that a second fluid flow passage is formed for passing the second fluid in the axial direction and discharging the second fluid through a gap between the other headers. 2. The heat exchanger according to claim 1, wherein the first header and the second header provided on the left and right are provided so as to have a gap in the vertical direction when viewed from the left and right. The first header and the second header provided on the left and right sides have a vertical gap when viewed from the left and right direction, and the straight pipe portions of the heat transfer tubes connected to the headers are defined as the left and right gaps. The heat exchanger according to claim 1, wherein the heat exchanger is provided in a parallel straight line. A heat transfer tube through which the first fluid to be heat exchanged is passed, and a header that is provided at both left and right ends of the heat transfer tube and flows the first fluid passed through the one heat transfer tube so as to be folded back into the other heat transfer tube A heat exchanger for exchanging heat with the first fluid in the heat transfer tube through the second fluid in the outer peripheral portion of the heat transfer tube,
A plurality of first headers connected to one side of the plurality of heat transfer tubes, each provided with a gap between the upper and lower sides,
A plurality of second headers connected to the other side of the plurality of heat transfer tubes, each provided with a gap between the upper and lower sides,
A plurality of third headers provided at the same height position as the first head, and provided on the other side of the plurality of heat transfer tubes so as to have a gap between the upper and lower sides,
Provided with a plurality of fourth headers provided so as to have a gap between the upper and lower sides at the same height position as the second head, and provided with a gap between the upper and lower sides, respectively.
The first fluid is passed so as to meander sequentially between the first header and the second header, and the first fluid is passed so as to meander sequentially between the third header and the fourth header. A heat exchanger characterized in that the second fluid is passed along the axial direction of the heat transfer tube from the sides of the left and right headers through the flow passage. The heat exchanger according to any one of claims 1 to 4, wherein a corrugated heat diffusion plate that fits within a gap width between the upper and lower sides of the header is attached to an outer peripheral portion of the plurality of heat transfer tubes.

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