JP2008196732A - Heat exchanger, manufacturing method of heat exchanger, and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger easily manufactured with a constitution of small number of components, and exchanging heat with high efficiency. <P>SOLUTION: This heat exchanger has a plurality of corrugated flat tubes 18 in which the fluid flows in the first direction, and which are arranged in parallel with each other at intervals in the second direction approximately orthogonal to the first direction. The corrugated flat tubes 18 have the flat shape long in the third direction with respect to the second direction, on a first plane along the second direction and the third direction, and have the corrugated shape on a second plane along the first direction and the second direction, when the direction approximately orthogonal to the first direction and the second direction is regarded as the third direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat exchanger, a method of manufacturing a heat exchanger, and a projector, and more particularly to a technology of a heat exchanger that performs heat exchange from a liquid to a gas.

  In recent years, projectors are required to have high brightness, and the amount of heat generated tends to increase as the amount of light that can be supplied increases. In order to increase the heat radiation efficiency of the light source, it is desirable to adopt a liquid cooling method in which a refrigerant flows instead of the conventional air cooling method. Furthermore, it is desirable to use a heat exchanger that can dissipate heat with high efficiency for the refrigerant that has received heat from the light source. Conventionally, for example, Patent Document 1 proposes a heat exchanger technology for performing heat dissipation with high efficiency. In the technique proposed in Patent Document 1, a plurality of fine tubes are arranged in a heat exchanger.

JP 2004-218969 A

  In the technique of Patent Document 1, a plurality of fine tubes having a diameter of 0.1 to 1 mm are used. Such a configuration including a plurality of fine tubes is difficult to manufacture. Conventionally, a configuration using a flat tube having a flat cross section instead of a tube having a circular cross section has been proposed. It is possible to improve the heat dissipation efficiency by increasing the surface area of the tube. In this case, in order to realize higher heat radiation efficiency, it is necessary to arrange many flat tubes, and the number of parts increases. As described above, according to the conventional technique, there is a problem that it is difficult to realize high-efficiency heat exchange with a configuration with a small number of parts that can be easily manufactured. The present invention has been made in view of the above-mentioned problems, and is a heat exchanger that can be easily manufactured and has a small number of parts, and can perform heat exchange with high efficiency, and a method of manufacturing the heat exchanger And a projector using the heat exchanger.

  In order to solve the above-described problems and achieve the object, according to the present invention, the fluid is caused to flow in the first direction, and the second direction substantially orthogonal to the first direction is spaced from each other and arranged in parallel. A plurality of corrugated flat tubes, and the third direction is a direction substantially perpendicular to the first direction and the second direction, the corrugated flat tubes are arranged along the second direction and the third direction. A flat shape which is long in the third direction with respect to the second direction is formed in one surface, and a corrugated shape is formed in the second surface along the first direction and the second direction. A heat exchanger can be provided.

  By using a corrugated flat tube obtained by deforming a flat tube into a corrugated shape (wave shape), the surface area can be increased compared to a circular tube or a normal flat tube. By increasing the surface area of the tube, heat exchange can be performed with high efficiency. By enabling heat exchange with high efficiency by using a small number of corrugated flat tubes, the number of parts can be reduced. Further, the corrugated flat tube can be easily formed by pressing the flat tube. Thereby, it is possible to obtain a heat exchanger that can be easily manufactured and has a small number of parts and can perform heat exchange with high efficiency.

  Moreover, as a preferable aspect of the present invention, it is preferable to have a fan that allows air to flow in the space between the corrugated flat tubes, and it is preferable that the fan causes air to flow along the third direction. By causing the air to flow along the third direction with respect to the corrugated flat tube having a corrugated shape in the second surface, it is possible to reduce the obstruction of the air flow by the corrugated flat tube. Thereby, heat exchange can be performed with higher efficiency.

  Moreover, as a preferable aspect of the present invention, it is desirable that the corrugated flat tube is configured using a stainless steel member. Thereby, high durability can be obtained.

  Furthermore, according to the present invention, there is provided a method of manufacturing a heat exchanger having a plurality of flow tubes arranged in parallel with a space between each other, wherein a flat tube with a spacer is inserted. A method of manufacturing a heat exchanger comprising: a flat tube forming step; and a corrugated flat tube forming step of forming a corrugated flat tube constituting a flow tube by deforming the flat tube and the spacer into a corrugated shape. Can be provided. Thereby, the heat exchanger which can perform heat exchange with high efficiency can be manufactured easily.

  As a preferred embodiment of the present invention, it is desirable to form a flat tube by pressing a cylindrical member in the flat tube forming step. Thereby, a flat tube can be formed easily.

  Moreover, as a preferable aspect of the present invention, the flat tube forming step includes forming a recess in a portion other than the portion along the first side of the first plate member and the portion along the second side facing the first side. It is desirable to include a forming step and a joining step of forming a flat tube by joining a portion along the first side of the first plate member and a portion along the second side to the second plate member. Thereby, an easy flat tube can be formed.

  Moreover, as a preferable aspect of the present invention, it is desirable that a plurality of spacers are arranged at intervals from each other in the flat tube forming step. By arranging the spacer, it is possible to prevent the inside of the corrugated flat tube from being completely blocked when the flat tube is deformed to the corrugated flat tube. In addition, by providing an interval between the spacers, a space for allowing fluid to flow can be secured. Thereby, a corrugated flat tube can be easily formed by deformation of the flat tube.

  As a preferred embodiment of the present invention, it is desirable to press the flat tube using a mold having a corrugated shape in the corrugated flat tube forming step. Thereby, the flat tube can be easily deformed into a corrugated shape.

  Moreover, as a preferable aspect of the present invention, it is desirable to include a spacer removing step of removing the spacer from the corrugated flat tube. By removing the spacer, a wide space for fluid flow can be secured. Thereby, it can be set as the structure which can perform heat exchange with still higher efficiency.

  Furthermore, according to the present invention, it is possible to provide a projector including the heat exchanger described above. By using the above heat exchanger, it is possible to easily perform manufacture and to have a configuration with a small number of parts and to perform heat exchange with high efficiency. As a result, it is possible to obtain a projector that can be easily manufactured and can display a bright image with a small number of components.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a schematic configuration of a heat exchanger 10 according to Embodiment 1 of the present invention. The heat exchanger 10 includes a main body 11 and a fan 12. The upper tank 13 is provided in a portion corresponding to the ceiling surface of the main body 11. The lower tank 14 is provided in a portion corresponding to the bottom surface of the main body 11. The radiator core 17 is provided between the upper tank 13 and the lower tank 14 in the main body 11.

  The inflow pipe 15 is connected to the upper tank 13. The inflow pipe 15 allows a refrigerant that is a fluid, for example, water to flow into the upper tank 13. The refrigerant from the inflow pipe 15 flows into the upper tank 13. The radiator core 17 is configured by arranging a plurality of corrugated flat tubes 18 in parallel. The upper tank 13 allows the refrigerant to flow into each corrugated flat tube 18 substantially evenly. The corrugated flat tube 18 allows the refrigerant from the upper tank 13 to pass through and flows into the lower tank 14. The corrugated flat tube 18 is a flow tube that causes the refrigerant to flow in the Y direction that is the first direction.

  The plurality of corrugated flat tubes 18 are arranged in parallel at intervals in the X direction. The X direction is a second direction substantially orthogonal to the Y direction, which is the first direction. The radiator core 17 releases the heat of the refrigerant into the air while the refrigerant flows in the corrugated flat tube 18. The corrugated flat tube 18 is configured using a metal member, for example, a stainless steel member. The refrigerant from the corrugated flat tube 18 flows into the lower tank 14. The outflow pipe 16 is connected to the lower tank 14. The outflow pipe 16 allows the refrigerant to flow out of the lower tank 14.

  The fan 12 is provided corresponding to the radiator core 17 of the main body 11. The fan 12 feeds air into the radiator core 17, thereby causing air to flow in the space between the corrugated flat tubes 18. The fan 12 causes air to flow along the Z direction. The Z direction is a third direction substantially orthogonal to the Y direction that is the first direction and the X direction that is the second direction. The heat exchanger 10 is configured by joining a main body 11 and a fan 12. In the figure, the main body 11 and the fan 12 are shown apart for the sake of explanation. The fan 12 may send air to the radiator core 17 or may send air from the radiator core 17 to the side opposite to the main body 11.

  The inflow pipe 15 and the outflow pipe 16 are connected to a circulation unit (not shown). The circulation part forms a flow path through which the refrigerant flows. A circulation pump (not shown) is used for the flow of the refrigerant. Heat from the heat source is transmitted to the refrigerant in the flow path through which the refrigerant flows. The heat exchanger 10 radiates heat from the refrigerant to the surrounding air.

  FIG. 2 shows a perspective configuration of the corrugated flat tube 18. The corrugated flat tube 18 is configured by deforming a thin flat tube formed in a plate shape into a corrugated shape. The corrugated flat tube 18 has openings formed in a portion connected to the upper tank 13 shown in FIG. 1 and a portion connected to the lower tank 14. The corrugated flat tube 18 causes the refrigerant to flow in a direction along the corrugated shape.

  FIG. 3 shows an XZ cross section of the radiator core 17 shown in FIG. The XZ plane is a first plane along the X direction that is the second direction and the Z direction that is the third direction. The corrugated flat tube 18 has a flat shape that is long in the Z direction with respect to the X direction in the XZ plane. Each corrugated flat tube 18 is formed with a length of, for example, several hundred μm in the X direction. The wall thickness of the corrugated flat tube 18 is, for example, 100 μm. The width | variety of the part which flows a refrigerant | coolant among the corrugated flat tubes 18 is 100-several hundred micrometers, for example. The corrugated flat tubes 18 are arranged in parallel at substantially equal intervals so that air can flow, for example, at intervals of 1 mm. In each corrugated flat tube 18, the refrigerant flows in the Y direction substantially orthogonal to the XZ plane. The heat from the refrigerant spreads in the direction along the XZ plane and is transmitted to the air outside the corrugated flat tube 18.

  Thus, by making the corrugated flat tube 18 into a very thin shape, there is little influence on the heat radiation efficiency without using a member having high thermal conductivity. Therefore, it is possible to select a material with more emphasis on corrosion resistance and cost than thermal conductivity. High durability can be acquired by comprising the corrugated flat tube 18 using the stainless member characterized by high corrosion resistance like a present Example.

  FIG. 4 shows an XY cross section of the corrugated flat tube 18 shown in FIG. The XY plane is a second plane along the Y direction that is the first direction and the X direction that is the second direction. The corrugated flat tube 18 has a corrugated shape (wave shape) in the XY plane. By making the corrugated flat tube 18 into a corrugated shape, the surface area can be increased compared to a normal flat tube. By increasing the surface area, heat exchange can be performed with high efficiency.

  Air from the fan 12 (see FIG. 1) flows in the Z direction substantially orthogonal to the XY plane. By causing the air to flow along the Z direction with respect to the corrugated flat tube 18 having a corrugated shape in the XY plane, it is possible to reduce the obstruction of the air flow by the corrugated flat tube 18. Thereby, heat exchange can be performed with higher efficiency.

  FIG. 5 shows a configuration example of the main body 20 of the conventional heat exchanger. The main body 20 includes a radiator core 21 in which a plurality of circular tubes 22 are arranged in parallel. The circular tube 22 is formed, for example, with a width of several hundred μm to several mm. In order to obtain the same efficiency as the case of the present embodiment, it is necessary to arrange many circular pipes 22. When the circular tubes 22 are arranged in a matrix as shown in FIG. 6, the pressure loss of air between the circular tubes 22 can be reduced, while the heat transfer rate from the refrigerant to the air is reduced by passing the air. . In particular, in the case of a small heat exchanger used in a small electronic device, the circular tubes 22 may be arranged in a staggered manner in order to improve the heat transfer rate from the refrigerant to the air. In this case, the heat transfer rate from the refrigerant to the air can be increased, while the pressure loss of the air between the circular tubes 22 increases.

  In this embodiment, by using the corrugated flat tube 18 obtained by further deforming the flat tube into a corrugated shape, the surface area of the tube can be increased as compared with the circular tube 22 or the flat tube. By enabling heat exchange with high efficiency by using a small number of corrugated flat tubes 18, the number of parts can be reduced. The corrugated flat tube 18 can be easily formed by pressing the flat tube as will be described later. Thereby, it can be easily manufactured and has a configuration with a small number of parts, and there is an effect that heat exchange can be performed with high efficiency.

  FIGS. 7-12 demonstrates the procedure of forming the corrugated flat tube 18 among the manufacturing methods of the heat exchanger 10. FIG. The corrugated flat tube 18 can be formed by a flat tube forming step of forming a flat tube having a flat shape and a corrugated flat tube forming step of forming the corrugated flat tube 18 from the flat tube. In the flat tube forming step, the cylindrical member 31 shown in FIG. 7 is pressed. The cylindrical member 31 is configured using a stainless steel member. A plurality of spacers 32 are inserted into the cylindrical member 31. The spacer 32 is the same stainless steel member as the rod-like and cylindrical member 31. Each spacer 32 is arranged along the cylindrical shape of the cylindrical member 31. By pressing the cylindrical member 31, a plate-like flat tube 33 is formed as shown in FIG. The flat tube 33 can be easily formed by pressing the cylindrical member 31.

  FIG. 9 shows a cross-sectional configuration of the flat tube 33 shown in FIG. Within the flat tube 33, the spacers 32 are arranged at substantially the same interval. The inside of the flat tube 33 has substantially the same width as the diameter of the spacer 32. Thus, in the flat tube forming step, the flat tube 33 into which the spacer 32 is inserted is formed.

  In the corrugated flat tube forming step, the flat tube 33 is pressed using two molds 34 and 35 as shown in FIG. Both molds 34 and 35 have a corrugated shape. The two molds 34 and 35 are formed so that both corrugated shapes are engaged with each other. By sandwiching the flat tube 33 between the two dies 34 and 35 and pressing the flat tube 33 using the two dies 34 and 35, the corrugated flat tube 18 having the corrugated shape transferred as shown in FIG. It is formed. By using the molds 34 and 35, the flat tube 33 can be easily deformed into a corrugated shape. By pressing the flat tube 33, the corrugated flat tube 18 having a substantially constant wall thickness is formed.

  FIG. 12 illustrates the deformation of the flat tube 33 in the corrugated flat tube forming step by showing a cross section along the spacer 32. For example, as shown in FIG. 12, when the flat tube 33 is pressed from above, the spacer 32 is also deformed together with the flat tube 33. Thus, in the corrugated flat tube forming step, the spacer 32 is also deformed into a corrugated shape together with the flat tube 33.

  By disposing the spacer 32, it is possible to prevent the inside of the corrugated flat tube 18 from being completely blocked when the flat tube 33 is deformed to the corrugated flat tube 18. Further, by providing an interval between the spacers 32, a space for allowing the refrigerant to flow can be secured. Thereby, the corrugated flat tube 18 can be easily formed by the deformation of the flat tube 33. The diameter of the spacer 32 can be determined according to the width of the portion of the corrugated flat tube 18 through which the refrigerant flows. For example, in the case of forming the corrugated flat tube 18 having a width of a portion through which the coolant flows is 100 μm, a spacer 32 having a diameter of 100 μm can be used.

  FIG. 13 illustrates another procedure of the flat tube forming process. Here, two plate members 41 and 42 are used. Each of the plate members 41 and 42 is a stainless steel member having a rectangular shape. First, in the recess forming step, the recess 43 is formed in the first plate member 41. The recess 43 is formed in a portion other than the portion 44 along the rectangular first side of the first plate member 41 and the portion 45 along the second side opposite to the first side. The recess 43 can be formed by pressing the first plate member 41 from a flat state.

  Next, in the joining step, the portion 44 along the first side and the portion 45 along the second side of the first plate member 41 are joined to the second plate member 42. For joining the first plate member 41 and the second plate member 42, welding can be used. For such welding, for example, seam welding can be used. The spacer 32 (not shown) is inserted between the recess 43 of the first plate member 41 and the second plate member 42. The spacer 32 may be inserted before the joining process or after the joining process.

  FIG. 14 shows a cross-sectional configuration of the flat tube 46 formed through the joining process. The width inside the flat tube 46 is determined by the depth of the recess 43. For example, when forming the corrugated flat tube 18 in which the width of the portion through which the refrigerant flows is 100 μm, the recess 43 having a depth of 100 μm can be formed. In this way, the flat tube 46 into which the spacer 32 is inserted can be formed. The flat tube 46 can be easily formed by the recess forming process and the joining process. Even when the flat tube 46 is formed, the corrugated flat tube 18 can be formed by the corrugated flat tube forming step described with reference to FIG.

  In addition, the number of the spacers 32 and the space | interval of the spacers 32 are not restricted to what is illustrated, It can set suitably. The spacer 32 is not limited to the same stainless steel member as the corrugated flat tube 18 but may be another member. The spacer 32 may be a member having rigidity capable of maintaining the diameter in the corrugated flat tube forming process. Further, in order to prevent leakage of the refrigerant from the heat exchanger 10, a corrosion potential difference may be provided so that the spacer 32 corrodes preferentially with respect to the corrugated flat tube 18.

  Further, the spacer 32 may be removed from the corrugated flat tube 18 formed in the corrugated flat tube forming step by the spacer removing step. For example, when the spacer 32 is configured using a resin member or the like, the spacer 32 can be removed by dissolution using an organic solvent or the like. By removing the spacers 32, a wide space for allowing the refrigerant to flow can be secured. Thereby, it can be set as the structure which can perform heat exchange with still higher efficiency.

  FIG. 15 shows a schematic configuration of a projector 50 according to the second embodiment of the invention. The projector 50 is a front projection type projector that views light by supplying light to the screen 55 and observing light reflected by the screen 55. The projector 50 includes a red (R) light source 51R, a green (G) light source 51G, and a blue (B) light source 51B. The R light source 51R is a light source that supplies R light. The light source unit 51G for G light is a light source unit that supplies G light. The B light source unit 51B is a light source unit that supplies B light.

  The light source unit 51R for R light includes an LED that is a solid light source. The R light spatial light modulator 52R is a spatial light modulator that modulates the R light from the R light source 51R according to an image signal, and is a transmissive liquid crystal display device. The R light modulated by the R light spatial light modulator 52R is incident on a cross dichroic prism 53 which is a color synthesis optical system. The light source unit 51G for G light includes an LED that is a solid light source. The G light spatial light modulator 52G is a spatial light modulator that modulates the G light from the G light source 51G according to an image signal, and is a transmissive liquid crystal display device. The G light modulated by the G light spatial light modulator 52G enters the cross dichroic prism 53, which is a color synthesis optical system.

  The light source unit 51B for B light includes an LED that is a solid light source. The B light spatial light modulation device 52B is a spatial light modulation device that modulates the B light from the B light source 51B according to an image signal, and is a transmissive liquid crystal display device. The B light modulated by the B light spatial light modulator 52B is incident on a cross dichroic prism 53 which is a color synthesis optical system. As the transmissive liquid crystal display device, for example, a high temperature polysilicon TFT liquid crystal panel (HTPS) can be used. The cross dichroic prism 53 combines the R light, the G light, and the B light incident from different directions and emits them in the direction of the projection lens 54. The projection lens 54 projects light from the cross dichroic prism 53 onto the screen 55.

  The circulation unit 57 is connected to the R light source unit 51R, the G light source unit 51G, the B light source unit 51B, the circulation pump 56, and the heat exchanger 10. Heat from the R light source unit 51R, the G light source unit 51G, and the B light source unit 51B is transmitted to the refrigerant flowing in the flow path. The heat exchanger 10 radiates heat from the refrigerant to the surrounding air. By using the heat exchanger 10 described above, heat exchange can be performed with high efficiency with a configuration that can be easily manufactured and has a small number of parts. This produces an effect that a bright image can be displayed with a configuration that can be easily manufactured and has a small number of components.

  The configuration of the circulation unit 57 and the positions of the circulation pump 56 and the heat exchanger 10 are not limited to those illustrated. The configuration of the projector 50 may be appropriately changed as long as the R light source 51R, the G light source 51G, and the B light source 51B can efficiently dissipate heat. Each color light source unit 51R, 51G, 51B is not limited to a configuration using LEDs, and may be a configuration using other solid-state light sources such as a semiconductor laser. Further, the projector 50 may be configured to use a light source other than the solid light source, for example, a lamp such as an ultra-high pressure mercury lamp.

  The projector 50 is not limited to the case where a transmissive liquid crystal display device is used as the spatial light modulation device. As the spatial light modulator, a reflective liquid crystal display (Liquid Crystal On Silicon; LCOS), DMD (Digital Micromirror Device), GLV (Grating Light Valve), or the like may be used. The projector 50 is not limited to a configuration including a spatial light modulator for each color light. The projector 50 may be configured to modulate two or three or more color lights with one spatial light modulator. The projector 50 is not limited to the case where a spatial light modulator is used. The projector 50 may be a laser scan type projector that projects an image onto a projection surface by scanning a laser beam from a light source unit with a scanning unit such as a galvanometer mirror. The projector may be a so-called rear projector that supplies light to one surface of the screen and observes an image by observing light emitted from the other surface of the screen.

  The heat exchanger 10 of the present invention is not limited to use in the projector 50. The heat exchanger 10 of the present invention can be applied to electronic devices that require effective heat dissipation, such as personal computers, servers, network routers, game machines, and the like.

  As described above, the heat exchanger according to the present invention is suitable for use in a projector.

The figure which shows schematic structure of the heat exchanger which concerns on Example 1 of this invention. The figure which shows the isometric view structure of a corrugated flat tube. The figure which shows the XZ cross section of the radiator core shown in FIG. The figure which shows XY cross section of the corrugated flat tube shown in FIG. The figure which shows the structural example of the main-body part of the conventional heat exchanger. The figure explaining arrangement | positioning of a circular pipe. The figure which shows a cylindrical member and a spacer. The figure which shows a flat tube. The figure which shows the cross-sectional structure of the flat tube shown in FIG. The figure explaining the press of the flat tube using two type | molds. The figure which shows a corrugated flat tube. The figure explaining the deformation | transformation of a flat tube, showing the cross section along a spacer. The figure explaining the other procedure of a flat tube formation process. The figure which shows the cross-sectional structure of the flat tube formed through the joining process. FIG. 5 is a diagram illustrating a schematic configuration of a projector according to a second embodiment of the invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Heat exchanger, 11 Main part, 12 Fan, 13 Upper tank, 14 Lower tank, 15 Inflow pipe, 16 Outflow pipe, 17 Radiator core, 18 Corrugated flat pipe, 20 Main part, 21 Radiator core, 22 Circular pipe, 31 cylinder Shaped member, 32 spacer, 33 flat tube, 34, 35 type, 41 first plate member, 42 second plate member, 43 recess, 44, 45 part, 46 flat tube, 50 projector, 51R light source for R light, 51G Light source unit for G light, 51B light source unit for B light, 52R spatial light modulation device for R light, 52G spatial light modulation device for G light, 52B spatial light modulation device for B light, 53 cross dichroic prism, 54 projection lens, 55 Screen, 56 Circulation pump, 57 Circulation section

Claims (10)

A plurality of corrugated flat tubes that flow in a first direction and are arranged parallel to each other in a second direction substantially perpendicular to the first direction;
When a direction substantially orthogonal to the first direction and the second direction is a third direction,
The corrugated flat tube has a long flat shape in the third direction with respect to the second direction in the first surface along the second direction and the third direction, and the first A heat exchanger having a corrugated shape in a direction and a second plane along the second direction. A fan that allows air to flow in the space between the corrugated flat tubes;
The heat exchanger according to claim 1, wherein the fan causes air to flow along the third direction.   The heat exchanger according to claim 1 or 2, wherein the corrugated flat tube is configured using a stainless steel member. A method of manufacturing a heat exchanger that has a plurality of flow pipes that flow fluid and are arranged in parallel at intervals,
A flat tube forming step for forming a flat tube having a flat shape with a spacer inserted;
And a corrugated flat tube forming step of forming a corrugated flat tube constituting the flow tube by deforming the flat tube and the spacer into a corrugated shape.   The method for manufacturing a heat exchanger according to claim 4, wherein, in the flat tube forming step, the flat tube is formed by pressing a cylindrical member. The flat tube forming step includes:
A recess forming step of forming a recess in a portion other than the portion along the first side of the first plate member and the portion along the second side facing the first side;
A joining step of forming the flat tube by joining a portion along the first side of the first plate member and a portion along the second side to the second plate member. Item 5. A method for producing a heat exchanger according to Item 4.   The method for manufacturing a heat exchanger according to any one of claims 4 to 6, wherein in the flat tube forming step, a plurality of the spacers are arranged at intervals.   In the said corrugated flat tube formation process, the said flat tube is pressed using the type | mold provided with the said corrugated shape, The manufacturing method of the heat exchanger as described in any one of Claims 4-7 characterized by the above-mentioned.   The manufacturing method of the heat exchanger as described in any one of Claims 4-8 including the spacer removal process which removes the said spacer from the said corrugated flat tube.   The projector provided with the heat exchanger as described in any one of Claims 1-3.

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