JP2011080704A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger mounted with heat transfer tubes between right and left headers for efficiently heat-exchanging even if it is miniaturized. <P>SOLUTION: The heat exchanger 1 includes the right and left headers 3 and the heat transfer tubes 6 connected between the right and left headers 3 and carries out heat exchanging between a first fluid 7 passing in the heat transfer tubes 6 via the headers 3 and a second fluid 8 passing outside the heat transfer tubes 6. In the heat exchanger 1, the right and left headers 3 are vertically laminated, and the vertically adjacent headers 3 are respectively displaced to the axial direction of the heat transfer tubes 6 so as to form gaps S for flowing the second fluid 8 between one header 3 and the headers 3 vertically adjacent to the one header 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat exchanger in which heat transfer tubes are connected between left and right headers. More specifically, the invention is made compact by devising the arrangement of headers, and the efficiency of heat exchange is improved. It relates to a heat exchanger.

  Conventionally, as a multi-pass heat exchanger, a structure as shown in FIG. 7 is known (Patent Document 1, etc.). The heat exchanger of FIG. 7 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, but FIG. 7 shows only both end portions. Reference numeral 202 denotes a heat transfer tube through which a refrigerant to be cooled is passed. 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 is passed through the other heat transfer tube 202. I am doing so.

  When cooling a refrigerant using such a multi-pass heat exchanger, first, the refrigerant is caused to flow from the space of the uppermost header 203. Then, the refrigerant flows through the heat transfer pipe 202 through the inflow space of the header 203 and flows into the partition space 205 of the right header 203. The refrigerant folded back in the partition space 205 of the header 203 flows into the lower heat transfer tube 202 and similarly flows to the partition space 205 of the left header 203. Thereafter, similarly, the refrigerant passes through the left header 203 and the right header 203 in a meandering manner. 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.

  Moreover, as another heat exchanger, as shown in FIG. 9, an apparatus is proposed in which air is exchanged by flowing air along the axial direction of the heat transfer tube (Patent Document 2). This apparatus will be described in detail. In FIG. 9, reference numeral 210 (LR) is a header provided on the left and right, and reference numeral 211 is 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 is provided with a corrugated fin (not shown) between the outer tube and the heat diffusion. 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 7 using such a heat exchanger, the 1st fluid 7 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 8 is introduced from the inlet 214 of the chamber 213, heat exchange is performed through the fin 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. 7, heat is exchanged with the refrigerant through the air in the direction perpendicular to the axial direction of the heat transfer tube. There is a problem that vortex or turbulent flow is generated in the gap 206 between the heat tube 202 and the heat transfer tube 202, and heat is accumulated therein and heat exchange cannot be performed well.

  In addition, as shown in FIG. 9, 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 direction in FIG. 9, and heat exchange cannot be performed efficiently in other parts (for example, near the wall surface of the chamber).

  Furthermore, in the structure as shown in FIG. 9, when the heat transfer tubes are compacted and made compact, if the air is introduced from the direction perpendicular to the axial direction of the heat transfer tubes, the gap of the heat transfer tubes becomes small, First, it becomes impossible to enter air in a direction perpendicular to the heat transfer tube.

  Therefore, in order to solve the above-described problems, the present invention provides a heat exchanger in which heat transfer tubes are attached between the left and right headers. It is intended to provide.

  That is, in order to solve the above-mentioned problem, the present invention is provided with a header provided on the left and right sides and a heat transfer tube connected between the left and right headers, and the first fluid passed through the heat transfer tube via the header. In the heat exchanger for exchanging heat with the second fluid passed outside the heat transfer tube, the left and right headers are stacked in the vertical direction, and the headers adjacent in the vertical direction are connected to the heat transfer tubes. A heat exchanger characterized in that a gap is formed between one header and a vertical header adjacent to the header, shifted in the axial direction.

  If it does in this way, since it is provided in the state which the header of the 1st layer and the header of the 2nd layer shifted, the thickness of the header to be laminated can be reduced and the heat exchanger can be made compact. In addition, since the second fluid can flow in through the gap between the headers, the second fluid and the heat transfer tube can be brought into contact with each other along the axial direction of the heat transfer tube, and efficiency is improved even when the size is reduced. Heat exchange can be performed well.

  In such an invention, the thickness of the header is gradually reduced in the vertical direction toward the outer end of the heat transfer tube.

  In this way, when flowing the second fluid from the header side, it is possible to form an inclined surface that divides the second fluid, and the second fluid is passed along the inclined surface to the upper or lower heat transfer tube. You can pass through.

  Further, all the distances between the left and right headers stacked in the vertical direction are made common. That is, when the headers on one side are arranged in order from right to left, the headers on the other end side are similarly arranged in order from right to left.

  If it does in this way, the heat exchanger which has a crevice can be formed only by laminating | stacking, shifting a unitized header and a heat exchanger tube alternately.

  In another invention, the outer pipe is connected to the left and right headers and allows the first fluid to flow through the header, and the outer pipe is provided inside the outer pipe and projects through the header to protrude outward. An inner pipe, an outer pipe connected to the left and right headers, and a casing that covers the inner pipe provided in the outer pipe and allows a second fluid to flow into the inner pipe, and the left and right headers are vertically And the headers adjacent in the vertical direction are respectively shifted in the axial direction of the outer tube, and the second fluid is caused to flow between the one header and the vertical header adjacent to the header. Create a gap.

  Similarly, when configured in this way, the heat exchanger can be made compact by reducing the thickness of the stacked headers, and the second fluid can be introduced through the gap between the headers. The second fluid and the heat transfer tube can be brought into contact with each other along the axial direction of the heat transfer tube, so that heat exchange can be efficiently performed even if it is compact. Moreover, the first fluid can be passed between the inner pipe and the outer pipe by passing the first fluid through the header, and the outer and inner sides of the outer pipe can be passed by flowing the second fluid into the sealed casing. The second fluid can be passed through the tube and the first fluid can be cooled or heated from the inside and the outside.

  According to the present invention, the left and right headers and the heat transfer tubes connected between the left and right headers are provided, and the first fluid passed through the heat transfer tubes via the headers is passed to the outside of the heat transfer tubes. In the heat exchanger for exchanging heat with the second fluid, the left and right headers are stacked in the vertical direction, and the headers adjacent in the vertical direction are shifted in the axial direction of the heat transfer tubes, respectively. Since a gap is formed between the header and the vertical header adjacent to the header, the thickness of the stacked headers can be reduced to make the heat exchanger compact. In addition, since the second fluid can flow in through the gap between the headers, the second fluid and the heat transfer tube can be brought into contact with each other along the axial direction of the heat transfer tube, and efficiency is improved even when the size is reduced. Heat exchange can be performed well.

1 is an external perspective view of one end side of a heat exchanger showing a first embodiment of the present invention. External perspective view of one end side in the same form Front schematic diagram in the same form Side view in the same form The figure which shows the heat exchanger in 2nd embodiment Schematic plan view in the same form 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, embodiments of the present invention will be described with reference to the drawings. 1 to 4 show the heat exchanger 1 in the first embodiment, and FIGS. 5 and 6 show the heat exchanger 1 in the second embodiment. Each of these heat exchangers 1 includes a unit 2 provided with a heat transfer tube 6 for passing a first fluid 7 to be heat exchanged into the tube, and headers 3 provided on the left and right ends of the heat transfer tube 6. The unit 2 is stacked by shifting the left and right positions of the header 3, thereby reducing the thickness width between the upper and lower sides, and from the gap between the headers 3 arranged in steps along the axial direction of the heat transfer tube 6. Heat exchange with the first fluid 7 can be performed through the two fluids 8.

<First embodiment>
Hereinafter, a first embodiment will be described. As shown in FIGS. 1 and 2, the heat exchanger 1 in the first embodiment includes a pair of left and right headers 3 having a triangular shape, and a plurality of heat transfer tubes 6 provided in parallel between the left and right headers 3. The headers 3 are alternately stacked in the vertical direction so that the headers 3 are different from each other, the first fluid 7 is introduced from one header 3, and the first fluid 7 is fed from the other header 3. Is to be discharged. Then, the second fluid 8 is caused to flow in the axial direction of the heat transfer tube 6 through the second fluid 8 such as air from the gap between the header 3 and the header 3 thus provided, and the position of the header 3 is shifted. Thus, the thickness in the vertical direction can be reduced. Hereinafter, the heat exchanger 1 in the first embodiment will be described in detail. In the present embodiment, for convenience of explanation, the “up and down direction” is the direction in which the headers 3 and the like are stacked in the drawing, and the “left and right direction” is the axial direction of the heat transfer tube 6. It can be replaced depending on the actual usage.

  First, the heat exchanger 1 includes a plurality of heat transfer tubes 6 connected between the left and right headers 3 as one unit 2, and a plurality of the units 2 are provided. The unit 2 has a thickness of several millimeters (for example, 2 mm), a width and length of several centimeters (for example, 3 to 5 cm), and a length of several centimeters to several tens of centimeters (for example, 5 to 10 cm). It is configured to be small, and these dimensions are appropriately changed according to the application in which the heat exchanger 1 is used. For example, when cooling a small thermal apparatus such as a CPU, the thickness is 2 mm × width 5 cm × length. On the other hand, when a very large thermal apparatus is to be cooled, such as 10 cm, a larger value is set. The heat transfer tube 6 constituting the unit 2 is constituted by a very fine stainless steel or ceramic hollow pipe having an outer diameter of about 1 mm, and allows the first fluid 7 to pass in the axial direction inside. On the other hand, as shown in FIGS. 1 and 2, the header 3 connected to both ends of the heat transfer tube 6 is configured to have an inclined surface 31 whose thickness dimension in the vertical direction is gradually reduced toward both outer sides. The first fluid 7 to be heat exchanged is passed through the inside, and the first fluid 7 is branched into the plurality of heat transfer tubes 6 connected thereto. The header 3 has a large end face 32 for connecting the heat transfer tube 6 so that the heat transfer tube 6 can be easily connected. A plurality of the heat transfer tubes 6 are passed through a rectangular metal plate. A hole is formed, and the heat transfer tube 6 is connected and welded to the hole, and then a rectangular metal plate is welded to the header 3. For this reason, this rectangular metal plate is configured to be larger than the outer diameter of the heat transfer tube 6 in the vertical direction. For example, when the outer dimension of the heat transfer tube 6 is about 1 mm, the metal plate forming the end surface 32 is It is configured to be about 2 mm.

  When such units 2 are stacked in the vertical direction, they are stacked with predetermined gaps in the vertical and horizontal directions so that the adjacent headers 3 are not in close contact with each other. That is, when the position of the uppermost header 3 is the first part 41, the second part 42 of the header 3 provided below the header 3 is, for example, the axis of the heat transfer tube 6 by the length in the left-right direction of the header 3. As shown in FIG. 4, the vertical direction is set so that there is almost no gap in the header 3 between the upper and lower sides when viewed from the side. Thus, even when the gap between the header 3 between the top and bottom when viewed from the side is small, the header 3 is actually shifted in the left-right direction as shown in FIG. Therefore, the second fluid 8 can flow in the axial direction along the inclined surface 31. On the other hand, if the headers 3 are stacked in the vertical direction without shifting, the gap for passing the second fluid 8 between the headers 3 must be increased. For example, the thickness of the header 3 is 2 mm and the gap Is set to 1 mm, the total thickness of the header 3 and the header 3 is 5 mm. However, if configured as in the present embodiment, the gap between the headers 3 when viewed from the side is 0.1 mm. Even if it exists, the big clearance gap shifted in the left-right direction can be formed. Thereby, even if the thickness of the header 3 and the header 3 is 4.1 mm, the second fluid 8 can be surely passed through the gap, and the thickness dimension in the vertical direction of the heat exchanger 1 can be reduced. it can.

  When the units 2 having the header 3 are stacked in this manner, the positions of the headers 3 are alternately arranged in the vertical direction such that the first part 41 and the second part 42 are alternately arranged. If it does in this way, about the header 3 on the opposite side of the heat exchanger tube 6, it will be arrange | positioned alternately so that it may have a clearance gap.

  In addition, an inflow part (51, 52) and an exhaust part (53, 54) for inflowing and exhausting the first fluid 7 are provided to the header 3 provided in the first part 41 and the second part 42. It is done. The inflow portions (51, 52) and the discharge portions (53, 54) are provided at the end portions in the longitudinal direction of the header 3, and the first inflow portion 51 is provided for the header 3 provided in the first portion 41. The second inflow portion 52 and the second discharge portion 54 are connected to the first discharge portion 53 and the header 3 provided in the second portion 42. And the connection part 55 is attached to the upper end part of these 1st inflow parts 51 and the 2nd inflow part 52, and the 1st fluid 7 is made to flow in from the inflow port 57. FIG. Similarly, the first discharge portion 53 and the second discharge portion 54 are provided with a connecting portion 56 to discharge the first fluid 7 from the discharge port 58.

  Next, the effect | action of the heat exchange in the heat exchanger 1 comprised in this way is demonstrated.

  First, when cooling the 1st fluid 7 used as the object of heat exchange, the 1st fluid 7 is made to flow in from the inflow port 57 provided in the connection part 55 of one edge part. Then, the first fluid 7 flows into the first inflow part 51 and the second inflow part 52 through the connecting part 55, and from there, the header 3 connected at the first part 41 and the header 3 connected at the second part 42. The first fluid 7 flows into the branch. When the first fluid 7 flows into the header 3 in this way, the first fluid 7 flows into the plurality of heat transfer tubes 6 connected to the end face 32 of each header 3, and the first portion 41 and the second portion on the opposite side. 42 headers 3 are discharged. And the 1st fluid 7 discharged | emitted in this way is discharged | emitted from the discharge port 58 through the connection part 56 similarly.

  On the other hand, with the first fluid 7 flowing in, the second fluid 8 is allowed to flow from the lateral direction of the header 3 on one side (that is, for example, the left direction of the header 3 in FIG. 3). The second fluid 8 may be a gas or a liquid, but in the present embodiment, a case where the first fluid 7 is cooled using a gas such as air will be described. When the second fluid 8 is blown using a fan 9 or the like, the second fluid 8 branches along the inclined surface 31 with the top of the triangular header 3 as a boundary, and the header 3 adjacent in the vertical direction. It flows in the axial direction of the heat transfer tube 6 through the gap S. And it flows to the axial direction of the heat exchanger tube 6 by the wind pressure by the fan 9, and in the meantime, it heat-exchanges with the 1st fluid 7 via the outer peripheral part of the heat exchanger tube 6, and from the clearance gap S with the header 3 on the opposite side. Discharged.

  As described above, according to the above-described embodiment, a plurality of units 2 constituted by the heat transfer tubes 6 connected to the pair of left and right headers 3 are stacked, and at that time, the positions of the headers 3 in the left-right direction are shifted. Therefore, the thickness dimension in the vertical direction can be reduced, and the efficiency of heat exchange can be improved by flowing the second fluid 8 in the axial direction of the heat transfer tube 6.

  In addition, since the unit 2 is shared and the distance between the headers 3 of each layer is constant, the heat exchanger 1 can be simply configured by mass-producing one unit 2 and stacking the units 2 while shifting them. Will be able to.

  In the present embodiment, the header 3 has a triangular shape. However, the present invention is not limited to this. For example, any shape can be used as long as the thickness of the second fluid 8 is reduced. The shape may be a semicircle, a semi-elliptical shape, or the like.

  In the above embodiment, a thin circular tube is used as the heat transfer tube 6, but a flat tube may be used.

<Second Embodiment>
Next, a second embodiment will be described with reference to FIGS. Similarly, in the heat exchanger 1 of the second embodiment, the units 2 configured by providing the headers 3 on both sides of the heat transfer tube 6 are alternately shifted in the vertical direction and stacked. The heat transfer tube 6 is divided into an outer tube 61 and an inner tube 62, the outer tube 61 is connected to the left and right headers 3, and the inner tube 62 is passed through the header 3 to cover the entire unit 2. The second fluid 8 is passed through the inner casing 62 and the outer periphery of the outer pipe 61 from the sealed casing 91. Hereinafter, the second embodiment will be described in detail. In the present embodiment, the “up and down direction” is described as the stacking direction of the units 2 in the drawing, and the “left and right direction” is described as the axial direction of the heat transfer tube 6.

  First, the heat transfer tube 6 is divided into an outer tube 61 and an inner tube 62 so that the first fluid 7 is passed through the gap between the outer tube 61 and the inner tube 62, and the inner tube 62 has a second Two fluids 8 are allowed to pass. The inner pipes 62 are provided coaxially with the outer pipes 61. Preferably, a plurality of inner pipes 62 are inserted so as to be inscribed in the outer pipes 61 in order to facilitate the assembly of the inner pipes 62. It is made to extend from both ends.

  On the other hand, the left and right headers 3 allow the first fluid 7 to flow into and out of the outer tube 61, weld the vicinity of the end of the outer tube 61, and extend the inner tube 62 from the outer tube 61. The first fluid 7 is prevented from flowing into the inner tube 62 by penetrating from the opposite wall surface and sealing the penetrating portion. When connecting the outer tube 61 to the header 3, similarly, a plurality of holes are provided in the end face 32, the outer tube 61 is inserted, and the inserted portion is welded to form a sealed space. Similarly, on the opposite wall surface, a plurality of holes for passing the inner tube 62 are provided, the inner tube 62 is inserted, and the inserted portion is welded to form a sealed space.

  As in the first embodiment, the units 2 configured in this way are stacked in the vertical direction with the horizontal position shifted, thereby forming a gap between the adjacent header 3 and header 3. When this lamination is performed, a single heat radiating plate may be provided between the upper and lower heat transfer tubes 6 to adjust the gap, or the header 3 may be attached to the upper and lower heat transfer tubes 6 without providing a heat radiating plate or the like. The upper and lower gaps may be adjusted by closely contacting each other. At this time, as in the first embodiment, the headers 3 are alternately positioned in the first part 41 and the second part 42, and the first inflow is introduced into the longitudinal end of the header 3 as shown in FIG. The part 51 and the second inflow part 52 are provided. Further, the first discharge portion 53 and the second discharge portion 54 are provided at the end portion in the longitudinal direction of the header 3 with respect to the opposite end portion. A connecting portion 56 is provided above the first discharge portion 53 and the second discharge portion 54 so that the first fluid 7 flows in / out from the inflow port 57 and the discharge port 58. The inlet 57 and the outlet 58 are provided outside the casing 91 that covers the unit 2, thereby allowing the first fluid 7 to flow in / out from the outside of the casing 91.

  On the other hand, the casing 91 forms a sealed space in which a plurality of units 2 are provided, and an inlet 59a for allowing the second fluid 8 to flow in the axial direction of the heat transfer tube 6 (outer tube 61), A discharge port 59b for discharging the second fluid 8 is provided. Then, the second fluid 8 is introduced through the inflow port 59a and discharged from the discharge port 59b.

  Next, the effect | action in the heat exchanger 1 comprised in this way is demonstrated.

  First, the first fluid 7 to be heat exchanged is introduced from the inflow port 57. Then, as shown in FIG. 6, it branches to the 1st inflow part 51 and the 2nd inflow part 52 via the connection part 55, and flows further in into each heat exchanger tube 6 from there. At this time, since only the outer pipe 61 is connected to the header 3, the first fluid 7 passes between the outer pipe 61 and the inner pipe 62 and is discharged from the header 3 on the opposite side. Then, the first fluid 7 is discharged to the connecting portion 56 through the first discharge portion 53 and the second discharge portion 54 and discharged to the outside through the discharge port 58.

  On the other hand, with the first fluid 7 flowing in, the second fluid 8 is flowed from the inlet 59a of the casing 91 this time. At this time, since the casing 91 is sealed, not only gas but also liquid can be used as the second fluid 8. When such a second fluid 8 is introduced through the inflow port 57, the second fluid 8 flows along the axial direction of the outer pipe 61 through the gap of the header 3 provided in a different step. Then, it is discharged through the gap between the opposite header 3 and the discharge port 59b.

  Similarly, the second fluid 8 flows into the inner pipe 62 extending from the header 3. When the second fluid 8 flows into the inner pipe 62 in this way, the first fluid 7 flowing through the gap between the outer pipe 61 and the inner pipe 62 can be cooled from the inside and the outside, and the efficiency of heat exchange can be further improved. Can do.

  As described above, also in the second embodiment, since the horizontal positions of the headers 3 are shifted and stacked alternately, the thickness dimension in the vertical direction can be reduced and the axis of the heat transfer tube 6 can be reduced. The efficiency of heat exchange can be improved by flowing the second fluid 8 in the direction. Further, since the entire unit 2 is covered with the casing 91, it is possible to use not only gas but also liquid as the second fluid 8.

  Furthermore, when the first fluid 7 is passed through the heat transfer tube 6, heat exchange can be performed from the inside by the inner tube 62, and heat exchange can also be performed from the outer peripheral portion of the outer tube 61. It becomes possible to improve the efficiency.

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

  For example, although the case where the first fluid 7 is cooled has been described in the above embodiment, the present invention can also be applied to the case where the first fluid 7 is heated.

  In the above embodiment, the units 2 are stacked. However, the present invention is not limited to such stacking, and the left and right headers 3 are alternately shifted and arranged as shown in FIG. The heat pipe 6 may be connected to the header 3 so as to reciprocate.

DESCRIPTION OF SYMBOLS 1 ... Heat exchanger 2 ... Unit 3 ... Header 31 ... Inclined surface 32 ... End surface 41 ... First part 42 ... Second part 51 ... First inflow part 52 ... second inflow part 53 ... first discharge part 54 ... second discharge part 55 ... connecting part 56 ... connecting part 57 ... inlet 58 ... discharge outlet 6 ... Heat transfer tube 61 ... outer tube 62 ... inner tube 7 ... first fluid 8 ... second fluid 9 ... fan 91 ... casing S ... gap

Claims (4)

A header provided on the left and right sides, and a heat transfer pipe connected between the left and right headers, and a second fluid passed through the header through the header to the outside of the heat transfer pipe; In the heat exchanger that performs heat exchange between
The left and right headers are stacked in the vertical direction, and the headers adjacent in the vertical direction are shifted in the axial direction of the heat transfer tubes, respectively, and the first header and the vertical header adjacent to the header are A heat exchanger characterized by forming a gap for allowing two fluids to flow in. The heat exchanger according to claim 1, wherein the shape of the header is such that the thickness width in the vertical direction gradually decreases toward the outer end of the heat transfer tube. The heat exchanger according to claim 1, wherein all the distances between the left and right headers are made common. An outer pipe connected to the left and right headers and allowing the first fluid to flow through the headers;
An inner pipe provided inside the outer pipe, penetrating the header and projecting an end to the outside;
An outer pipe connected to the left and right headers and an inner pipe provided in the outer pipe, and a casing for allowing the second fluid to flow into the inner pipe,
The left and right headers are stacked in the vertical direction, and the headers adjacent in the vertical direction are shifted in the axial direction of the outer tube, respectively, so that the first header and the vertical header adjacent to the header are A heat exchanger characterized by forming a gap for allowing two fluids to flow in.

Images