WO2000037859A1

WO2000037859A1 - Laminated double pipe heat exchanger and regenerative air conditioning system using it

Info

Publication number: WO2000037859A1
Application number: PCT/JP1998/005754
Authority: WO
Inventors: Hajime Mukawa
Original assignee: Bosch Automotive Systems Corporation
Priority date: 1998-12-21
Filing date: 1998-12-21
Publication date: 2000-06-29

Abstract

A laminated double pipe heat exchanger (8) capable of preventing external leakage of a combustible heat exchange medium, comprising tube elements (25) and fins (26) alternately laminated one upon another, wherein each of tube elements has a first flow path (65) comprising a pair of tank units (66a, 66b) provided on one end side of a tube element (25) and a tank communication flow path (67) providing communication between the pair of tank units and a second flow path so formed as to envelope the first flow path (65). A combustible refrigerant is circulated through the first flow path (65), and a soluble brine for dissolving and absorbing the combustible refrigerant through the second flow path (70).

Description

Details

Stacked double tube heat exchanger and regenerative air conditioner using the same

Technical field

The present invention provides a laminated type two-stage heat exchanger including two flow paths through which a heat exchange medium flows, wherein the heat exchange medium flowing through these flow paths exchanges heat with the outside air, and can also exchange heat between the two heat exchange media. It is used for heavy-pipe heat exchangers and used in vehicles, etc., and stores cold heat generated in the evaporator of an air conditioner during engine operation in a cold storage material. The present invention relates to a regenerative air conditioner that enables cooling and cooling of a nap room, an on-board refrigerator, and the like. Background art

An air conditioner for a vehicle disclosed in Japanese Patent Application Laid-Open No. 10-53019 includes a main evaporator for cooling the interior of a passenger compartment, and a cool storage evaporator for cooling a cool storage pack for cooling in a nap room. Are separately provided, and at the time of cold storage, the cooling valve is cooled by controlling the opening and closing of an electromagnetic valve provided in the refrigerant flow path to flow the refrigerant to the cold storage evaporator.

However, the vehicle air conditioner disclosed in Japanese Patent Application Publication No. Hei 10-53019 has a cool storage evaporator separately from the main evaporator, and circulates the same refrigerant in the main cycle and the cool storage cycle. Therefore, extra space is required for placing the cool storage evaporator, and when the cool storage cycle is not operating, the compressor lubricating oil sent together with the refrigerant from the compressor accumulates in the cool storage evaporator. Oil stagnation is likely to occur, which may cause compressor burn-in. For this reason, it is conceivable to use an independent refrigeration cycle for the regenerative cycle. Is a big deal.

In recent years, flammable refrigerants such as hydrocarbons, which have a very small effect on the ozone layer, have been attracting attention due to environmental considerations.However, in the cabin unit, especially the pipe connection and tube brazing near evaporator Is a place where refrigerant leakage is likely to occur, and when flammable refrigerants are used, particularly strict measures must be taken.

Therefore, the present invention provides a laminated double-pipe heat exchanger that can prevent the flammable heat exchange medium from leaking to the outside, and by using the laminated double-pipe heat exchanger, A regenerative air conditioner using a laminated double-pipe heat exchanger that does not cause oil stagnation in the refrigeration cycle and that can prevent the flammable refrigerant from leaking when flammable refrigerant is used. The purpose is to provide. Disclosure of the invention

According to the present invention, a tube element having a first flow path through which a first heat exchange medium flows and a second flow path through which a second heat exchange medium flows, and fins are alternately stacked, The heat exchanger according to claim 1, wherein the heat exchange medium exchanges heat with the outside air and heat exchanges between the first heat exchange medium and the second heat exchange medium. The flow path is composed of a pair of tank sections provided on one end side of the tube element and a tank communication flow path that connects the pair of tank sections, and the second flow path includes the first flow path. The first channel is provided so as to wrap the outside of the channel and not communicate with the first channel, and the first channels of the adjacent tube elements are formed on the side of the tank portion. Through the through-holes to form the first flow path group, and End and is formed at the other end of the second channel to each other the second flow path of said tube element to A first heat exchange medium into which a first heat exchange medium flows into a predetermined portion of the first flow path group. An inlet and a first heat exchange medium outlet through which the first heat exchange medium flows are provided, and the second heat exchange medium flows into a predetermined portion of the second flow path group. A second heat exchange medium inflow port and a second heat exchange medium outflow port through which the second heat exchange medium flows out.

According to the above configuration, when a plurality of tube elements are connected, a pair of tanks is connected to a tank of an adjacent tube element, and the two rows of tanks are connected to the pair of tanks and the tanks. A first flow path group composed of a plurality of tank communication flow paths to be formed and a second flow path group configured to wrap around the outside of the first flow path group are independently formed. Is defined. Then, the first heat exchange medium flows through the first flow path group, and the second heat exchange medium flows through the second flow path group. In addition to heat exchange with the outside air via the fins interposed between the heat exchangers, heat exchange can be performed between the first and second heat exchange media. Thereby, if a flammable refrigerant such as a hydrocarbon flows through the first flow path group, and a soluble brine having a property of dissolving the flammable refrigerant flows through the second flow path group, The heat can be exchanged between the flammable refrigerant and the soluble brine, and even if the flammable refrigerant leaks, the leaked flammable refrigerant is dissolved and absorbed in the soluble brine. Leakage into the vehicle interior or the like can be prevented. Further, the tube element has a pair of inner plates in which a tank forming portion and a tank communication channel forming portion are bulged, and has a bulging width larger than the tank forming portion and the ink communication channel forming portion. The second flow path forming portion has a pair of swelled outer plates, and the pair of inner plates are joined to each other so that the swelling portions face outward. Inside pre The first flow path is defined between the nozzles, and the pair of outer plates are joined to each other so that the bulging portions face outward and cover the pair of inner plates. The second flow path may be defined between the inner plate and the outer plate.

According to the above configuration, the first flow path and the second flow path formed so as to surround the outside of the first flow path can be reliably and easily defined, and the first flow path can be defined. Exchange between the heat exchange medium flowing through the second flow path and the heat exchange medium flowing through the second flow path can be performed via the inner plate.

In addition, the present invention provides at least a compressor for pumping refrigerant, a condenser for cooling and condensing and liquefying the refrigerant, expansion means for expanding the refrigerant, and the stack as an evaporator for evaporating the refrigerant by heat exchange. A closed-loop refrigeration cycle, which is connected to the double-tube heat exchanger by piping, and at least the stacked double-tube heat exchanger, a pump for circulating brine, the brine and a cold storage material And a regenerator cooler for exchanging heat with the regenerator material to cool the regenerator material.The regenerator has a regenerative cycle forming a closed loop.When the regenerative operation is performed, the compressor and the pump are driven. The pump is stopped.

The regenerative air conditioner having the above configuration uses the above-described laminated double-pipe heat exchanger as an evaporator for the air conditioner. The generated cold heat is also transmitted to the brine. By circulating the brine having received the cold heat in the cold storage cycle by the pump, heat can be exchanged between the brine and the cold storage material in the cold storage material cooler, and the cold heat can be stored in the cold storage material. Then, when the cold storage is completed, the pump is stopped to stop the circulation of the brine, and the battery is used to drive the fan for sending cool air, or by using natural cooling to use the cold storage heat. Cooling can be performed.

In addition, the present invention may be such that the refrigerant is caused to flow through the first flow path group and the brine is flowed through the second flow path group, and a flammable refrigerant is used as the refrigerant. In addition to the above, a soluble brine having a property of dissolving the flammable refrigerant may be used as the brine. According to the above configuration, the refrigerant that is the heat exchange medium of the refrigeration cycle flows through the first flow path group of the laminated double-pipe heat exchanger, and the brine that is the heat exchange medium of the cold storage cycle is the first refrigerant. When a flammable refrigerant such as a hydrocarbon is used as the refrigerant by flowing through the second flow path group provided outside the flow path group, the flammable refrigerant has a property of dissolving the flammable refrigerant. If used together with the brine, even if the flammable refrigerant flowing inside leaks from the brazing portion, etc., the leaked flammable refrigerant will be dissolved and absorbed by the soluble brine flowing outside, so flammable Leakage of the conductive refrigerant into the vehicle or the like is prevented.

Further, in the present invention, cold heat stored in the cold storage material may be used for a refrigerator for a vehicle. As a result, the refrigerator provided in the vehicle can also be cooled using the cold storage heat. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing a regenerative air conditioner using a laminated double-pipe heat exchanger according to the present invention.

FIG. 2 (a) is a plan view showing the structure of the front side and one side of the laminated double-tube heat exchanger according to the present invention, and FIG. 2 (b) is the laminated type heat exchanger according to the present invention. It is a top view which shows the structure of the back side and other side surfaces of a double tube heat exchanger.

FIG. 3 is a plan view showing the structure of the lower surface of the stacked double-tube heat exchanger according to the present invention. FIG. 4 (a) is a cross-sectional view taken along line AA in FIG. 5 (a), showing the structure of the inner plate and the outer plate constituting the tube element of the laminated double-tube heat exchanger according to the present invention. FIG. 4 (b) is a cross-sectional view taken along the line BB ′ in FIG. 4 (b), showing the structure when the inner plate and the outer plate are joined face-to-face.

FIG. 4 (a) is a side cross-sectional view showing an inner flow path of the laminated double-pipe heat exchanger according to the present invention, and FIG. 5 (b) is a laminated double-pipe heat exchanger according to the present invention. FIG. 4 is a side cross-sectional view showing an outer flow path of the exchanger.

FIG. 6 (a) is a cross-sectional view showing the flow direction of the refrigerant and the brine at the front side of the laminated double-pipe heat exchanger according to the present invention, and FIG. 6 (b) relates to the present invention. It is sectional drawing which shows the distribution direction of the refrigerant | coolant and the brine in the back side of a laminated | stacked double tube heat exchanger.

FIG. 7 is a schematic perspective view showing the flow path of the refrigerant and the brine in the laminated double-pipe heat exchanger according to the present invention.

FIG. 8 (a) is a schematic diagram showing a coolant cooler used in the cold storage cycle of the cool storage air conditioner according to the present invention, and FIG. 8 (b) is a cool storage air conditioner according to the present invention. It is the schematic which shows the liquid amount adjustment reservoir used for the cold storage cycle of an apparatus. FIG. 9 is a block diagram showing a regenerative air conditioner having a refrigerating room using regenerative heat of regenerative material. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in more detail with reference to the accompanying drawings. A regenerative air conditioner 1 shown in FIG. 1 has a compressor 4 for pumping a refrigerant as a first heat exchange medium, and a refrigerant compressed by the compressor 4 is cooled and condensed and liquefied by heat exchange with outside air. Capacitor 5 and this capacitor 5, a liquid tank 6 for gas-liquid separation of the refrigerant flowing out of the liquid tank 5 and only the liquid flow out, an expansion valve 7 for expanding the refrigerant flowing out of the liquid tank 6, and a refrigerant expanded by the expansion valve 7 by heat exchange. There is provided a refrigeration cycle 2 in which a stacked double-pipe heat exchanger 8 functioning as an evaporator for evaporating to generate cool air is connected in series with a pipe.

Further, the regenerative air conditioner 1 includes the stacked double-pipe heat exchanger 8, a pump 13 for circulating brine as a second heat exchange medium, a regenerator material 14 capable of storing cold heat, and The regenerator has a regenerator cycle 3 in which a regenerator cooler 15 for exchanging heat with brine and a liquid amount adjusting reservoir 19 for allowing a change in the volume of the brine due to a temperature change are connected in series. It is preferable to use a heat-insulating resin hose or the like as a pipe connecting each of the components 8, 13, 15, and 9 constituting the cold storage cycle 2.

In the laminated double-tube heat exchanger 8 described in detail below, the refrigerant as the heat exchange medium of the refrigeration cycle 2 and the brine as the heat exchange medium of the regenerative cycle 3 flow separately. The refrigerant absorbs heat from the outside and evaporates to generate cold heat, and heat exchange is performed between the refrigerant and the brine, whereby the brine is formed. In this case, the cold heat of the refrigerant is conducted. The laminated double-pipe heat exchanger 8 is disposed in a first air blast unit 9 having an air conditioner fan 10 and an air outlet 11, and the air conditioner fan 10. As a result, the cool air generated by the evaporation of the refrigerant can be sent out from the air outlet 11 as cold air into a vehicle interior or the like.

The cool storage material cooler 15 shown in FIG. 8 (a) has a heat conducting portion 80 made of a material having high heat conductivity such as aluminum, and a heat conducting portion 80 is provided around the heat conducting portion 80. The cold storage material 14 is arranged in contact. The heat conducting part 80 is Inlet 8 1 through which air flows in and a brine outlet 8 2 through which the brine flows out, and a plurality of pipe-shaped brine flow passages 8 3 communicating with the inlet 8 1 and the outlet 8 2. The cold heat of the brine flowing in the heat conducting portion 80 is conducted to the cold storage material 14. Further, as shown in FIG. 1, the cool storage material cooler 15 is disposed in a second ventilation unit 16 provided with a cool storage fan 17 and an air outlet 18, The cold air released from the material 14 can be sent out from the air outlet 18 as cold air to a nap room or the like.

Further, the liquid amount adjusting reservoir 19 shown in FIG. 8 (b) is provided on a casing 86 for storing the brine, and on one side and the other side of the casing 86. The casing 86 is composed of an inflow pipe 87 and an outflow pipe 88 that communicate the inside of the casing with the pipeline through which the brine circulates. The inflow pipe 87 is provided so that the opening 87 a inside the casing 86 is located above the casing 86, and the outflow pipe 88 is provided inside the casing 86. The opening 88 a is provided near the bottom of the casing 86. This allows the brine to expand in volume until the liquid level of the brine accumulated in the casing 86 reaches the position of the opening 87 a of the inflow pipe 87 even if the brine expands in volume due to temperature rise. Therefore, problems such as rupture of the connection pipe can be prevented.

The laminated double-tube heat exchange 8 shown in FIGS. 2 to 7 is composed of a plurality of (12 in this embodiment) tube elements 25 and corrugated fins 26. Are alternately laminated to form a core body, and the tube element 25a at one end side in the laminating direction has a refrigerant inlet 2.7 through which the refrigerant circulating in the refrigeration cycle 2 flows and circulates in the core body. A refrigerant outlet 32 from which the discharged refrigerant flows out is provided, and a tube element 25 b on the other end side is provided with: A brine inlet 41 into which the brine circulating in the cool storage cycle 3 flows and a brine outlet 43 from which the brine circulating in the core body flows out are provided. The refrigerant inlet 27 communicates with a flow passage 28.The flow passage 28 is provided inside a fourth inflow tube element 25e from the tube element 25b on the other end side. It communicates with an inflow pipe 29 which is guided through a refrigerant inflow hole 46 (see FIG. 3).

The tube element 25 includes a pair of inner plates 50, 50 and a pair of outer plates 58, 58, as shown in FIGS. 4 (a) and 4 (b). The inner plate 50 has a tank forming portion 52 and a U-shaped channel forming portion 51 formed so as to bulge outward. The tank forming portion 52 has a lower end of the inner plate 50. In the vicinity, a pair is formed in the front-back direction (left-right direction in FIG. 5) of the tube element 25, and a pair of inner plates 50, 50 are joined face-to-face, as shown in FIG. As shown, a front tank portion 66a and a rear tank portion 66b are defined. Further, the U-shaped flow path forming portion 51 is formed to have a smaller bulging width than the tank forming portion 52 and has a folded wall portion 53 formed therein. As shown in FIG. 5 (a), by forming a pair of inner plates 50, 50 face-to-face by forming a U-shaped cross section folded back at the upper part of the inner plate 50, as shown in FIG. A U-shaped channel 67 is formed to connect the front and rear tank portions 66 a and 66 b to each other. The front and rear tank portions 66 a and 66 b and the U-shaped channel 67 constitute an inner channel 65. The upper and lower ends of the inner plate 50 are provided with upper and lower joints 54 and 55 for joining the pair of inner plates 12 and 12 together by brazing or the like. In addition, the tank forming portion 52 has the tank portions 66 a and 66 b of the tube element 25 adjacent thereto. A tank communication hole 68 for communicating with the tank portions 66 a and 66 b of the element 25 is formed.The lower end joint portion 55 has a lower end flow passage 73 of an outer flow passage 70 described later. A brine circulation hole 79 is formed to allow the flowing brine to flow.

In the outer plate 58, an upper end flow path forming section 59, a lower flow path forming section 60, and an intermediate flow path forming section 63 are formed so as to bulge outward, respectively. The passage forming portion 59 is near the upper end of the outer plate 58, the lower flow passage forming portion 60 is near the lower end of the outer plate 58, and the outer side of the evening forming portion 52 of the inner plate 50. The intermediate channel forming portion 63 is formed between the upper end channel forming portion 59 and the lower end channel forming portion 60. The fin 26 is formed so as to have a smaller bulging width than the flow path forming portions 59 and 60, and the fins 26 can be interposed in the concave portions 64 formed thereby. An upper end joint 61 and a lower end joint 62 for joining the pair of outer plates 58, 58 to each other by brazing or the like are provided at an upper end portion and a lower end portion of the outer plate 58. I have. When these pair of outer plates 58, 58 are face-to-face bonded such that the bulges thereof face outward and sandwich the pair of inner plates 50, 50, it is shown in FIG. 5 (b). As described above, an upper end flow path 71 defined by the upper end flow path formation section 59 and a lower end flow path formation section 60 are defined so as to wrap the outside of the tank sections 66 a and 66. A lower end flow path 73 and an intermediate flow path forming section 63 define an intermediate flow path 72 communicating the upper end flow path 71 and the lower end flow path 73. The lower flow path 72 and the intermediate flow path 73 constitute an outer flow path 70.

Further, the upper end flow path forming portion 76 is formed with an upper end communication hole 76 for communicating with the upper end flow path 71 of the adjacent tube element 25. The lower end flow path forming portion 60 is used to connect the tank portions 66 a and 66 b of the tube element 25 to the tank portions 66 a and 66 b of the adjacent tube element 25. The tank communication hole 69 is formed, and a lower communication hole 77 for communicating the lower flow path 73 of the tube element 25 with the lower flow path 73 of the adjacent tube element 25 is formed. ing. Thereby, two rows of tank groups are formed in the stacking direction of the tube elements 25.

In this embodiment, as shown in FIG. 6 (b), one of the two tube elements located at the middle part has one middle tube element 25c and the other middle tube element 25c. The tank communication holes 68, 69 are not formed between the rear tank portions 66b of d, and are not connected to each other. In addition, a refrigerant inflow hole 46 communicating with the flow pipe 29 is formed in the tank portion 66 b on the rear side of the inflow tube element 25 e, and the tube element 25 on one end side is formed. A refrigerant outlet hole 30 is formed in the rear side tank portion 66 b of a, and the refrigerant outlet hole 30 communicates with a refrigerant outlet passage 31 having the refrigerant outlet 32.

The upper end flow path 71 of the tube element 25 b on the other end side is formed with a brine inflow hole 74 communicating with the flow path 40 having the brine inlet 41. The channel 73 is provided with a brine outlet 75 communicating with the channel 42 having the brine outlet 43.

According to the laminated double-pipe heat exchanger 8 having the above-described configuration, the refrigerant flowing in from the refrigerant inflow port 27 first passes through the distribution pipe 29, and then flows into the rear tank portion 6 of the inflow tube element 25 e. 6b (see FIG. 6 (b)) and the six tube elements 25b to 25d from the tube element 25b on the other end to the other intermediate tube element 25. Flows into the rear tank part 6 6 b of the tube element and passes through the U-shaped flow path 67, and these tube elements 25 b to 25 d Flows into the front tank part 66a of the tank (see Fig. 6 (a)). Then, it flows into the front tank portion 66a of the six tube elements 25a to 25c from the one end side tube element 25a to the one intermediate tube element 25c, and the U-shaped flow After flowing through the passage 67, it flows into the rear tank portion 66b of the six tube elements 25a to 25c from the tube element 25a on the one end side to the one intermediate tube element 25c (No. 6 See Figure (b)). Then, the refrigerant flows out from the refrigerant outlet hole 30 formed in the rear ink portion 66 b of the tube element 25 a on the one end side into the flow channel 31, and flows out from the refrigerant outlet 32.

On the other hand, the brine that has flowed in from the brine inflow port 41 flows into the upper end flow path 71 of the tube element 25 b at the other end from the brine inflow hole 74 formed in the flow path 40, and Through the upper end communication hole 76 formed at the upper end of the tube element 25, it flows to the upper end flow path 71 of the tube element 25a on the one end side, and from each upper end flow path 7 1 to the intermediate flow path 7 2 flows downward into the lower end flow path 73, and the brine flowing into the lower end flow path 73 flows through the lower end flow hole 77 and the brine flow hole 79 to the other end side. It flows out from the brine outflow hole 75 formed in the tube element 25 b of the tube, and flows out from the brine outlet 43 through the flow path 42.

In this way, the refrigerant flows through the four-path route that reciprocates up and down two times in the laminated double-pipe heat exchanger 8, as indicated by the arrow A in FIG. 7, while the brine flows through the arrow B It circulates in a one-pass route from top to bottom.

As described above, the outer flow path 70 composed of the upper end flow path 71, the intermediate flow path 72, and the lower end flow path 73 includes the tank portions 66a, 66b and the U-shaped flow path. Since it is provided so as to wrap the inner flow path 65 composed of the channel 67, the brine circulating in the outer flow path 70 is formed by a concave portion of the outer plate 58. The fins 26 joined to the fins 26 exchange heat with the outside air, and the refrigerant flowing in the inner flow path 65 and the brine flowing in the outer flow path 70 pass through the inner plate 51. Heat exchange.

In the regenerative air conditioner 1 using the laminated double-pipe heat exchanger 8 shown in FIG. 1, when the air conditioner is operated, that is, when the compressor 2 of the refrigeration cycle 2 is driven, By driving the pump 13 of the cool storage cycle 3 to circulate the brine, the brine cooled in the laminated double-pipe heat exchanger 8 is passed through the cool storage material cooler 15, and the cool storage material 1 is cooled. Cool 4 Then, when the cooling of the cold storage material 14 is completed, the pump 13 is stopped to stop the circulation of the brine, and when cooling and cooling using the cold storage heat of the cold storage material 14 are performed, Instead of driving the pump 13, the battery 17 drives the cool storage fan 17 in the second blower unit 16 to cool the vehicle interior or the nap room.

According to the above configuration, since different heat exchange media are used for the refrigeration cycle 2 and the regenerative cycle 3, oil stagnation does not occur in the refrigeration cycle 2 when the regenerative cycle 3 is not operating. Since the brine is circulated when the air conditioner is operating, that is, when the engine is running, there is no burden on the battery.

When a hydrocarbon-based refrigerant such as propane or butane, that is, a flammable refrigerant is used as the refrigerant, if the brine is a soluble brine having a property of dissolving and absorbing the flammable refrigerant, Even if the flammable refrigerant leaks in the stacked double-pipe heat exchanger 8, the fusible brine dissolves and absorbs it, so that the flammable refrigerant leaks into the vehicle interior or the like. Can be prevented. As the soluble refrigerant, a product name "Fluorinert", "Hydrofluoroether", etc., manufactured by 3M Company is suitably used. Further, as shown in FIG. 9, the cold heat stored in the cold storage material 14 is sent out as cold air to a refrigerator room 90 of a refrigerator installed in the vehicle by driving a fan 17, whereby the cold storage is performed. It is also possible to cool the chamber 90. Further, by disposing the cold storage material 14 and the cold storage material cooling unit 15 on the wall of the cold storage room 90 so as to cover the cold storage room 90, the spontaneous release of cold air of the cold storage material 14 is used. Then, the inside of the refrigerator compartment 90 can be cooled. Industrial applicability

As described above, according to the laminated double-pipe heat exchanger according to the present invention, it is possible to prevent the flammable refrigerant such as hydrocarbons from leaking to the outside. Further, according to the regenerative air conditioner using the laminated double-pipe heat exchanger, oil stagnation does not occur in the refrigeration cycle, and even when a flammable refrigerant is used, the flammable refrigerant is used. Can be prevented from leaking. Furthermore, the cold stored in the cold storage material can be used for cooling the on-board refrigerator.

Claims

The scope of the claims

1. A tube element having a first flow path through which the first heat exchange medium flows and a second flow path through which the second heat exchange medium flows, and fins are alternately laminated, and the second heat In the laminated double-tube heat exchanger in which the exchange medium exchanges heat with the outside air and also exchanges heat between the first heat exchange medium and the second heat exchange medium, the first flow path includes: It comprises a pair of tank portions provided at one end of the tube element and a tank communication channel for communicating the pair of tank portions, and the second channel is provided outside the first channel. And is provided so as not to communicate with the first flow path,

The first flow paths of the adjacent tube elements are connected to each other through a through hole formed in a side portion of the tank portion to form a first flow path group, and the first flow paths of the adjacent tube elements are formed. The second flow paths are connected to each other through through holes formed at one end and the other end of the second flow path to form a second flow path group, and the first flow path group A first heat exchange medium inflow port through which the first heat exchange medium flows, and a first heat exchange medium outflow port through which the first heat exchange medium flows out, are provided in A predetermined portion of the second flow path group is provided with a second heat exchange medium inflow port into which the second heat exchange medium flows and a second heat exchange medium outflow port through which the second heat exchange medium flows out. A stacked double-tube heat exchanger characterized by being used.

2. The tube element has a pair of inner plates in which the tank forming portion and the tank communication channel forming portion are bulged, and a bulging width larger than the tank forming portion and the ink communication channel forming portion. A second flow path forming portion having a pair of swelled outer plates,

The pair of inner plates may be joined to each other such that the bulging portion faces outward. Thus, the first flow path is defined between the two inner plates, and the pair of outer plates are arranged so that the bulging portion faces outward and cover the pair of inner plates. The stacked double-pipe heat exchanger according to claim 1, wherein the second flow path is defined between the inner plate and the outer plate by joining.

3. A compressor for pumping at least a refrigerant, a condenser for cooling and condensing and liquefying the refrigerant, an expansion means for expanding the refrigerant, and an evaporator for evaporating the refrigerant by heat exchange. Or a stacked-type double-pipe heat exchanger described in 2 above is connected by piping and has a refrigeration cycle forming a closed loop, and

At least the stacked double-pipe heat exchanger, a pump for circulating brine, and a regenerator cooler for exchanging heat between the brine and the regenerator to cool the regenerator are connected by piping. A cold storage cycle comprising a closed-loop double-tube heat exchanger, wherein the compressor and the pump are driven during cold storage, and the pump is stopped when cold storage is completed. Air conditioner.

4. The laminated mold according to claim 3, wherein the refrigerant is circulated in the first flow path group and the brine is circulated in the second flow path group. A regenerative air conditioner using a heavy pipe heat exchanger.

5. The laminated double-tube heat according to claim 4, wherein a flammable refrigerant is used as the refrigerant, and a soluble brine having a property of dissolving the flammable refrigerant is used as the brine. A regenerative air conditioner using an exchanger.

6. The laminated double-tube heat exchanger according to claim 3, 4, or 5, wherein the cold stored in the cold storage material is used for an in-vehicle refrigerator. Cool storage type air conditioner.