JP2008170049A - Water-water heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-water heat exchanger with high heat exchange efficiency, capable of coping with demands with different heat exchange capacities. <P>SOLUTION: The water-water heat exchanger is composed of a heat exchange part 60 of a center part of a heat exchanger 29 for reheating, and inlet and outlet distribution parts 61, 62 provided on both side parts of the heat exchange part 60. It is composed such that heat exchange liquid introduced into a passage 84A via a heat exchange liquid introduction pipe 82 is passed through a first passage 63, a third passage 67, a fifth passage 71, and a seventh passage 75, and such that a liquid to be heat-exchanged introduced into a passage 84B from the heat exchange part 60 is passed through a second passage 65, a fourth passage 69, and a third passage 73 and led out of an heat-exchanged liquid lead-out pipe 83. It is composed such that the heat exchange liquid from the first passage 63, the third passage 67, the fifth passage 71, and the seventh passage 75 is led out of a heat exchange liquid lead-out pipe 92 into a passage 94A, and such that the heat-exchanged liquid introduced via a heat-exchanged liquid introducing pipe 93 is passed through the second passage 65, the fourth passage 69, and the sixth passage 73. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a water heat exchanger, for example, a water heat exchanger such as a reheating heat exchanger in a heat pump type hot water supply apparatus.

This type of heat pump type hot water supply apparatus is known from, for example, Patent Document 1, and a water heat exchanger such as a reheating heat exchanger is also widely known.
JP 2004-232978 A

  Such water heat exchangers are required to have high heat exchange efficiency in the market, and sometimes have different heat exchange capabilities in the market.

  Then, this invention is made | formed in view of the above-mentioned situation, and it aims at providing the water-to-water heat exchanger which can respond to the request | requirement from which the efficiency of heat exchange is high and heat exchange capability differs.

  For this reason, the first invention comprises a heat exchange section in which a tube through which the heat exchange liquid or the heat exchange liquid flows and a tube through which the heat exchange liquid or the heat exchange liquid flows are concentrically disposed between the pipe, A first lead-in / out distribution part having a heat exchange liquid inlet and a heat exchange liquid outlet on one side of the heat exchange part, and a heat exchange liquid inlet and heat exchange on the other side of the heat exchange part A second lead-in / out distribution unit having a liquid lead-out port, and the heat exchange liquid introduced from the heat exchange liquid introduction port of the first lead-in / out distribution unit through the first lead-out / distribution unit The heat exchange liquid introduced into the heat exchange section and introduced from the heat exchange liquid inlet of the second lead-in / out distribution section is introduced into the heat exchange section through the second lead-out / distribution section. When the heat exchange liquid and the heat exchange liquid are exchanged, and after this heat exchange, the heat exchange liquid is led out from the heat exchange liquid outlet of the second lead-in / out distributor. Characterized in that for deriving the heat exchange fluid from the heat exchange fluid outlet port of the first derivation distributor.

  According to a second aspect of the present invention, there are provided a heat exchanging unit configured such that a plurality of concentric tubes are arranged so that a heat exchange liquid and a heat exchange liquid alternately flow between the tubes, A first lead-in / out distribution part having a heat exchange liquid inlet and a heat exchange liquid outlet on one side, and a heat exchange liquid inlet and a heat exchange liquid outlet on the other side of the heat exchange part. A second lead-in / out distribution unit, and the heat exchange part introduced from the heat exchange liquid introduction port of the first lead-out / distribution part through the first lead-out / distribution part. And heat exchange by introducing the heat exchange liquid introduced from the heat exchange liquid inlet of the second lead-in / distribution section into the heat exchange section via the second lead-out / distribution section. Heat exchange between the liquid and the heat exchange liquid, and after this heat exchange, the heat exchange liquid is led out from the heat exchange liquid outlet of the second lead-in / out distribution section and the first Characterized in that for deriving the heat exchange fluid from the heat exchange fluid outlet in and out the distribution unit.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a plurality of gap forming portions are protruded outward of the inner tube, and the gap forming portions are brought into contact with the outer tube, so that the heat exchange liquid It is characterized in that an interval between passages through which the heat exchange liquid flows is formed.

  ADVANTAGE OF THE INVENTION According to this invention, the efficiency of heat exchange can be provided and the water-to-water heat exchanger which can respond also to the request | requirement from which heat exchange capability differs can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. First, an embodiment of a heat pump type hot water supply apparatus provided with a reheating heat exchanger which is a water heat exchanger according to the present invention will be described. In FIG. 1, which is a schematic configuration diagram of the entire configuration, a heat pump type hot water supply apparatus 10 includes a heat pump unit 11 and a hot water storage tank unit 12 connected to the heat pump unit 11 by piping. The heat pump unit 11 and the hot water storage tank unit. 12 is usually installed outdoors.

  The heat pump unit 11 includes a variable capacity compressor 13 such as a rotary two-stage compressor, a water refrigerant heat exchanger 14 as a heating device, a decompression device 15 such as an electric expansion valve, an air heat exchanger in a unit main body 11A. And an evaporator 16, a heat exchange blower 19 that ventilates the evaporator 16 and exchanges heat with air, an accumulator 17, and a heat pump side control device 18.

  The compressor 13, the radiator 14 </ b> A constituting the water refrigerant heat exchanger 14, the decompressor 15, the evaporator 16, and the accumulator 17 are connected in a ring shape by a refrigerant pipe 20 and compress carbon dioxide as a refrigerant. A heat pump cycle (refrigerant circuit) X that compresses to a supercritical pressure by the machine 13 is configured. The water-refrigerant heat exchanger 14 includes the radiator 14A and the heat receiver 14B.

  The hot water storage tank unit 12 includes a hot water storage tank 22, a water supply pipe 23 connected to the bottom of the hot water storage tank 22, a water supply on / off valve 24, a branch water supply pipe 25, a hot water storage pipe 26, Circulation pump 27, reheating pipe 28, reheating heat exchanger 29, which is a water heat exchanger, bath water pipe 30, bath water circulation pump 31, hot water supply pipe 33, mixing valve 34, bath A hot water supply opening / closing valve 35, a tank side control device 36, and the like are accommodated. A pressure relief valve 21 is connected to the hot water supply pipe 33.

  Further, the outlet portion 26 A of the hot water storage pipe 26 is connected to the bottom portion of the hot water storage tank 22, and the inlet portion 26 B of the hot water storage pipe 26 is connected to the top portion of the hot water storage tank 22. The outlet 28A of the reheating pipe 28 and the hot water supply pipe 33 are connected to the top of the hot water storage tank 22, respectively.

  Then, hot water was circulated between the water refrigerant heat exchanger 14 and the hot water storage tank 22 to heat and exchange heat with the refrigerant of the heat pump cycle (refrigerant circuit) X in the water refrigerant heat exchanger 14. A first hot water circulation path 50 for storing hot water in the hot water storage tank 22 is formed. Further, a second hot water circulation path 51 for circulating hot water between the hot water heat exchanger 29 and the hot water storage tank 22 for tracking hot water in the bathtub 40 is formed. Furthermore, the 3rd warm water circulation path 53 which circulates bathtub water between the said heat exchanger 29 for a chasing and the bathtub 40 for chasing the said bath water is formed.

  The first hot water circulation circuit 50 between the water refrigerant heat exchanger 14 and the hot water storage tank 22, the second hot water circulation circuit 51 between the reheating heat exchanger 29 and the hot water storage tank 22, and Are connected so as to partially overlap, and the water in the hot water storage tank 22 is taken out and supplied to the water refrigerant heat exchanger 14 at the connection start point (one connection end) in the overlapped circuit, or There is provided a first three-way valve 54 for switching whether the hot water from the upper part of the hot water storage tank 22 is replenished by the reheating heat exchanger 29 and supplied to the intermediate part of the hot water storage tank 22 or not. The water in the hot water storage tank 22 through the first three-way valve 54 is supplied to the water refrigerant heat exchanger 14 at the connection end point (the other connection end) in the middle, or through the first three-way valve 54. Remembrance with the reheating heat exchanger 29 And whether supply back to the middle portion of the hot water storage tank 22 hot water, a second three-way valve 55 to switch to provide. In addition, the hot water storage and recirculation circulation pump 27 is disposed between the first three-way valve 54 and the second three-way valve 55.

  37 is a communication line for connecting the heat pump side control device 18 and the tank side control device 36, 38 is a kitchen remote controller, 39 is a bath remote controller, and these remote controllers 38 and 39 are tank side control devices. 36 is connected to the wiring.

  Next, the reheating heat exchanger 29 will be described in detail with reference to FIGS. 2 is an external view of the reheating heat exchanger 29, FIG. 3 is also a right side view, FIG. 4 is a longitudinal sectional view, and FIG. 5 is a cross-sectional view taken along line AA in FIG. .

  The reheating heat exchanger 29 is roughly composed of a central heat exchanging portion 60 and lead-in / out distributing portions 61 and 62 provided on both sides of the heat exchanging portion 60. The heat exchanging unit 60 includes a cylindrical central first pipe 64 that forms a first passage 63 through which hot water that is one of the high-temperature heat exchange liquids that flows in the reheating pipe 28, and the central first pipe 64. A cylindrical second pipe 66 that forms a second passage 65 through which water (or hot water) that is a heat exchange liquid flowing in the bath water pipe 30 passes outside the pipe 64, and outside the second pipe 66. A cylindrical third pipe 68 that forms a third passage 67 through which the heat exchange liquid passes, and a cylindrical fourth pipe that forms a fourth passage 69 through which the heat exchange liquid passes outside the third pipe 68. 70, a cylindrical fifth pipe 72 forming a fifth passage 71 through which the heat exchange liquid passes outside the fourth pipe 70, and a sixth pipe through which the heat exchange liquid passes outside the fifth pipe 72. A cylindrical sixth pipe 74 forming the passage 73 and a seventh passage 75 through which the heat exchange liquid passes outside the sixth pipe 74 are formed. Composed of seventh pipe 76. cylindrical to.

  That is, the second pipe 66, the third pipe 68, the fourth pipe 70, the fifth pipe 72, the sixth pipe 74, and the seventh pipe 76 are arranged concentrically on the outer side of the central first pipe 64. To be formed. And the center 1st pipe | tube 64 is the longest, and it becomes short gradually toward the outer pipe | tube, and the 7th pipe | tube 76 is the shortest. A plurality of baffle plates 77 are arranged inside the central first pipe 64 so that the speed of the flowing heat exchange liquid can be decreased to further promote heat exchange.

  Next, the lead-out / distribution unit 61 on the right side of FIG. 4 will be described. A cylindrical outer tube 80 is disposed on the outside concentrically with each tube constituting the heat exchange unit 60. A heat exchange liquid introduction pipe 82 into which hot water is introduced from the upper part of the hot water storage tank 22 through the reheating pipe 28 penetrates to the disk-shaped outer closing plate 81 that closes the right opening, It arrange | positions in the state which the front-end | tip of the to-be-heated liquid extraction pipe | tube 83 which leads the water (or warm water) from the said heat exchange part 60 to the bathtub 40 penetrated.

  Further, the inner tube 85 constitutes the heat exchanging part 60 so as to form passages 84A and 84B through which the heat exchange liquid or the heat exchange liquid passes inside the outer pipe 80 and outside the seventh pipe 76. Are arranged concentrically with each tube. A disc-shaped inner closing plate 86 that closes the right opening of the inner tube 85 shorter than the outer tube 80 is disposed with the tip of the heat exchange liquid outlet tube 83 penetrating therethrough.

  Further, the heat exchange liquid introduced into the passage 84A through the heat exchange liquid introduction pipe 82 flows into the first passage 63, the third passage 67, the fifth passage 71, and the seventh passage 75, and the passage. In the inner pipe 85, the heat exchange liquid introduced from the heat exchanging portion 60 into the flow passage 84 </ b> B flows through the second passage 65, the fourth passage 69 and the sixth passage 73 and can be led out from the heat exchange liquid outlet pipe 83. In addition, each closing plate 88 to which each right end portion of the central first pipe 64 to the seventh pipe 76 penetrates and is fixed is disposed, and the inner pipe 85 is provided with respective communication ports 89A and 89B.

  On the other hand, the left lead-in / out distribution unit 62 in FIG. 4 will be described. A cylindrical outer tube 90 is arranged on the outer side concentrically with each tube constituting the heat exchanging unit 60. A disk-like outer closing plate 91 that closes the opening penetrates a heat exchange liquid outlet tube 92 through which heat exchange liquid is led out to the center, and the heat exchange liquid to be introduced from the bathtub 40 is introduced into the outer cover plate 91. It arrange | positions in the state which the front-end | tip of the heat exchange liquid inlet tube 93 penetrated.

  Further, the inner tube 95 constitutes the heat exchanging part 60 so as to form passages 94A and 94B through which the heat exchange liquid or the heat exchange liquid passes inside the outer pipe 90 and outside the seventh pipe 76. Are arranged concentrically with each tube. A disc-shaped inner closing plate 96 that closes the left opening of the inner tube 95 shorter than the outer tube 90 is disposed in a state where the tip of the heat exchange liquid outlet tube 92 penetrates.

  Further, the heat exchange liquid from the first passage 63, the third passage 67, the fifth passage 71, and the seventh passage 75 of the heat exchanging section 60 is led out from the heat exchange liquid outlet pipe 92 to the passage 94A. The central first pipe 64 to the seventh pipe in the inner pipe 95 so that the heat exchange liquid introduced through the heat exchange liquid introduction pipe 93 flows into the second passage 65, the fourth passage 69 and the sixth passage 73. Each closing plate 98 through which each left end portion of the pipe 76 passes and is fixed is disposed, and each communication port 99A, 99B is opened in the inner pipe 95.

  The branch plate 100A is provided in a horizontal state so that the passages 84A and 84B do not communicate with each other at the right end portion, and the branch plate 100B is provided in a horizontal state so that the passages 94A and 94B do not communicate with each other at the left end portion. . That is, the right side surface of the branch plate 100A in FIG. 4 is fixed inside the outer closing plate 81, the front and rear surfaces are fixed inside the inner tube 85, and the left end is fixed so as to bite into the inner closing plate 86, As shown in FIG. 5, the inner tube 85 has an approximately elliptical cross section, and its long diameter portion is further bulged outwardly, and this bulged portion is fixed to the inner surface of the outer tube 80. Further, the left side surface of the branch plate 100B in FIG. 4 is fixed inside the outer closing plate 91, the front and rear surfaces are fixed inside the inner tube 95, and the right end portion is fixed so as to bite into the inner closing plate 96, The inner tube 95 has an approximately elliptical cross section, and its long diameter portion is further bulged outward, and this bulged portion is fixed to the inner surface of the outer tube 90.

  Here, when filling the bath tub 40 with hot water, when a bath hot water switch (not shown) of the bath remote controller 39 is pressed, the hot water tank 22 is pushed out to the hot water supply pipe 33. Hot water flows into the mixing valve 34, where it is mixed with tap water supplied from the water supply pipe 23 and the branch water supply pipe 25, and hot water having a preset temperature is poured into the bathtub 40 through the hot water supply pipe 41. When the predetermined amount of hot water is poured, the hot water filling is completed.

  Next, hot water boiling operation will be described. First, when the compressor 13 of the heat pump cycle X is started by starting the operation of the heat pump unit 11, the refrigerant of carbon dioxide is compressed in two stages by the compressor 13, and the supercritical pressure that is compressed and discharged by the compressor 13 is high. The high-pressure liquid refrigerant dissipates heat in the radiator 14A, exchanges heat with water flowing through the heat receiver 14B, and heats the water.

  The refrigerant whose temperature has decreased due to heat dissipation by the radiator 14A is reduced in pressure by the decompression device 15 and becomes low pressure, and then flows into the evaporator 16, where it absorbs heat from the air and evaporates. It becomes a low-pressure gaseous refrigerant, flows into the accumulator 17, and is sucked into the compressor 13 from the accumulator 17 and compressed again.

  With the start of operation of the heat pump unit 11, the hot water storage and recirculation circulation pump 27 in the hot water storage tank unit 12 is activated, and water in the lower part of the hot water storage tank 22 is taken out and supplied to the water refrigerant heat exchanger 14. Thus, the first three-way valve 54 is switched and the second three-way valve 55 is switched so that the water in the lower part of the hot water storage tank 22 through the first three way valve 54 is supplied to the water-refrigerant heat exchanger 14. Due to the operation of the circulation pump 27 for use and reheating, low temperature or normal temperature water in the lower part of the hot water storage tank 22 flows from the outlet 26A into the hot water storage pipe 26, and the first three-way valve 54, for hot water storage and reheating. The refrigerant flows into the heat receiver 14B through the circulation pump 27 and the second three-way valve 55, and is heated by exchanging heat with the high-temperature and high-pressure refrigerant flowing in the radiator 14A.

  The hot water heated by the heat receiver 14B flows into the upper portion of the hot water storage tank 22 from the inlet portion 26B, and hot water of 80 ° C. or higher is stored in the hot water storage tank 22 as the boiling operation time elapses. When the amount of hot water increases gradually and the hot water layer reaches a certain position in the lower part of the hot water storage tank 22, the boiling operation is completed.

  Further, the bath water circulation pump 31 and the hot water storage / refreshing circulation pump 27 are operated, and the hot water from the upper part of the hot water storage tank 22 is replenished by the reheating heat exchanger 29 and the hot water storage tank 22 is operated. The first three-way valve 54 is switched so as to return to the intermediate portion of the hot water, and the hot water reheated by the reheating heat exchanger 29 via the first three-way valve 54 is returned to the intermediate portion of the hot water storage tank 22. 2 When the three-way valve 55 is switched, the hot water in the hot water storage tank 22 and the hot water in the bathtub 40 are heat-exchanged by the heat exchanger 29 for reheating, and the hot water in the bathtub 40 can be reheated.

  That is, the hot water in the upper part of the hot water storage tank 22 flows from the outlet portion 28A into the reheating pipe 28, and the reheating heat exchanger 29, the first three-way valve 54, the hot water regenerating and recirculating pump 27 and It is returned to the intermediate part of the hot water storage tank 22 through the second three-way valve 55, and the hot water in the bathtub 40 flows into the bath water pipe 30, and passes through the bath water circulation pump 31 and the reheating heat exchanger 29. Returned to the bathtub 40, the hot water in the hot water storage tank 22 and the hot water in the bathtub 40 are heat-exchanged by the reheating heat exchanger 29, and the hot water in the bathtub 40 is reheated.

  In this case, high-temperature water from the hot water storage tank 22 is introduced into the heat exchange unit 60 from the right lead-in / out distribution unit 61, and hot water from the bathtub 40 is introduced into the heat exchange unit 60 from the left lead-in / out distribution unit 62. Therefore, heat is exchanged in the heat exchange unit 60.

  More specifically, high-temperature water from the hot water storage tank 22 is introduced into the passage 84A of the right outlet / inlet distribution unit 61 through the heat exchange liquid introduction pipe 82, and each of the passages 63, 67, 71 through the communication ports 89A. And 75 to flow into. On the other hand, the hot water from the bathtub 40 is introduced into the passage 94B of the left lead-in / out distributor 62 through the heat exchange liquid introduction pipe 93 and flows into the passages 65, 69, and 73 through the communication ports 99B. Distributed.

  Therefore, as described above, the hot water from the hot water storage tank 22 and the hot water from the bathtub 40 are introduced into the heat exchanging unit 60, and heat exchange with a high heat exchange rate is performed.

  After this heat exchange, the hot water from the hot water storage tank 22 is led out to the passage 94A through each communication port 99A, and is led out from the heat exchange liquid lead-out pipe 92 to the first three-way valve 54, for hot water storage and reheating. The hot water from the hot tub 40 is returned to the intermediate portion of the hot water storage tank 22 through the circulation pump and the second three-way valve 55, while the hot water from the bathtub 40 is led out to the passage 84B through the communication ports 89B. Is returned to the bathtub 40 again.

  Further, as shown in FIG. 6, the central first pipe 64, second pipe 66, third pipe 68, fourth pipe 70, fifth pipe 72, and sixth pipe 74 have a plurality of interval forming portions outward. 101 is made to project and scattered, and the width of each passage 65, 67, 69, 71, 73, 75 is made constant by bringing the top of the gap forming portion 101 into contact with the inner surface of the tube outside each tube. Therefore, the flow of hot water flowing through the passages can be made turbulent, and coupled with increasing the heat transfer area, the heat exchange rate can be further improved.

  As shown in FIG. 7, the heat exchange liquid introduction pipe 82 and the heat exchange liquid outlet pipe 83 may be provided not on the right side of the right outlet / inlet distribution part 61 but on the cylindrical side surface. The pipe 92 and the heat exchange liquid introduction pipe 93 may be provided on the cylindrical side surface instead of the left side of the left lead-in / out distribution unit 61.

  As described above, according to the present invention, the efficiency of heat exchange is high, the length of the heat exchange section 60 and the lead-in / out distribution sections 61 and 62 is different, and the multiple tubes constituting the heat exchange section 60 etc. By preparing a plurality of ones with different numbers, it is possible to provide a water-to-water heat exchanger that can meet the requirements of specifications with different heat exchange capabilities.

  Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the various alternatives and modifications described above without departing from the spirit of the present invention. Or a modification is included.

It is a schematic block diagram of the whole structure of a heat pump type hot water supply apparatus. It is an external view of the heat exchanger for reheating which is a water heat exchanger. It is a right view of the heat exchanger for a chasing similarly. It is a longitudinal cross-sectional view of the heat exchanger for reheating which is also a water heat exchanger. It is AA sectional drawing of FIG. It is a partial longitudinal cross-sectional view of the heat exchanger for tracking similarly. It is an external view of the heat exchanger for reheating of other embodiment similarly.

Explanation of symbols

X heat pump cycle 10 hot water supply device 11 heat pump unit 12 hot water storage tank unit 22 hot water storage tank 29 heat exchanger for reheating 60 heat exchange unit 61, 62 lead-in / out distribution unit 64 central first pipe 66 second pipe 68 third pipe 70 fourth Pipe 72 Fifth pipe 74 Sixth pipe 76 Seventh pipe 82 Heat exchange liquid introduction pipe 83 Heat exchange liquid outlet pipe 84A, B passage 89A, B communication port 92 Heat exchange liquid outlet pipe 93 Heat exchange liquid introduction pipe 94A, B passage 99A, B communication port 101 interval forming part

Claims (3)

  A heat exchange part in which a heat exchange liquid or a heat exchange liquid flows between the pipe through which the heat exchange liquid or the heat exchange liquid flows and this pipe are arranged concentrically, and on one side of the heat exchange part A first lead-in / out distribution section having a heat exchange liquid inlet and a heat exchange liquid outlet, and a second having a heat exchange liquid inlet and a heat exchange liquid outlet on the other side of the heat exchange section. A heat exchange liquid introduced from a heat exchange liquid introduction port of the first lead-in / distribution section and introduced into the heat exchange section via the first lead-out / distribution section. The heat exchange liquid introduced from the heat exchange liquid inlet of the second lead-in / distribution section is introduced into the heat exchange section via the second lead-in / distribution section, so that the heat exchange liquid and the heat After exchanging heat with the exchange liquid, after this heat exchange, the heat exchange liquid is led out from the heat exchange liquid outlet of the second lead-in / out distribution section and the first lead-in / out distribution Water people heat exchanger, characterized in that for deriving the heat exchange fluid from the heat exchange fluid outlet port of the.   A heat exchange unit configured such that heat exchange liquid and heat exchange liquid flow alternately between each tube, and tubes are arranged in multiple concentric circles, and heat exchange is performed on one side of this heat exchange unit A first lead-in / out distribution unit having a liquid inlet and a heat exchange liquid outlet, and a second lead out having a heat exchange liquid inlet and a heat exchange liquid outlet on the other side of the heat exchange part A heat exchange liquid introduced from a heat exchange liquid introduction port of the first lead-in / distribution section, and introduces the heat exchange liquid into the heat exchange section via the first lead-out / distribution section. The heat exchange liquid introduced from the heat exchange liquid inlet of the two lead-in / out distribution sections is introduced into the heat exchange section via the second lead-out / distribution section, whereby the heat exchange liquid and the heat exchange liquid are introduced. After the heat exchange, the heat exchange liquid is led out from the heat exchange liquid outlet of the second lead-in / out distributor and the first lead-out / distributor Water people heat exchanger, characterized in that for deriving the heat exchange fluid from the heat exchange fluid outlet port.   A plurality of gap forming portions are protruded outward of the inner tube, and the gap forming portions are brought into contact with the outer tube so as to form an interval of a passage through which the heat exchange liquid or the heat exchange liquid flows. The water heat exchanger according to claim 1 or 2, wherein the water heat exchanger is provided.

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