Compact heat storage and exchange device and manufacturing method thereof

Abstract

The invention relates to a compact heat storage and exchange device and a manufacturing method thereof.The heat storage and exchange device comprises micro-channel parallel flow flat pipes, small collecting pipes, large collecting pipes and phase change heat storage materials, the phase change heat storage materials are located between the micro-channel parallel flow flat pipes, the two ends of each parallel flow flat pipe are open and communicated with the small collecting pipes, and the small collecting pipes are communicated with the large collecting pipes; the small collecting pipe is communicated with the large collecting pipe through a connecting pipe; the phase change heat storage material contains a heat conduction framework to form a composite phase change material, and the high heat conductivity direction of the composite phase change material is consistent with the direction of a flow channel in the flat pipe. Compared with the prior art, the spatial layout of the phase change heat storage composite material microstructure and the heat exchange fluid flow channel is optimized in space, and the contact heat resistance between the phase change heat storage composite material and the heat exchange flat pipe is reduced; and the working mode and the input / output power of the heat storage heat exchanger can be flexibly adjusted by changing the connecting mode of the small collecting pipes.

Description

Technical Field

[0001] The present invention relates to the technical field of heat storage and heat management, and in particular to a compact heat storage and heat exchange device and a manufacturing method thereof. Background Art

[0002] Thermal storage technology can be widely used in solar thermal utilization, building energy conservation, heat pump air conditioning and other energy storage technologies such as compressed air energy storage technology, which can effectively overcome the time intermittent and intensity unstable problems of heat flow, so as to achieve the decoupling of thermal energy supply and demand in time and intensity, and effectively match the supply and demand relationship. Thermal storage technology includes three categories: sensible heat storage, phase change latent heat storage and thermochemical heat storage. Among them, latent heat storage technology based on solid-liquid phase change is in the early stage of commercial application and still faces problems such as low power density caused by insufficient heat transfer performance and low energy density caused by non-compact device structure.

[0003] Existing heat transfer enhancement measures include the use of finned tube heat exchangers, plate-fin heat exchangers, the use of metal foam to fill phase change materials, the addition of thermal conductive additives inside the phase change materials, etc. These measures can improve the heat transfer coefficient to a certain extent, but face problems such as increased weight and insufficient heat transfer enhancement, which seriously restrict the energy density and power density of phase change heat storage devices. In addition, most of the existing phase change heat storage and heat exchange devices are single fluid channels, which only allow one fluid to exchange heat with the phase change material, and cannot meet the situation where two or more fluids flow at the same time, which greatly limits the application scenarios of heat storage heat exchangers. Although existing reports use multiple coils placed inside the phase change heat storage to form multiple fluid heat exchange channels, the overall heat storage and heat transfer performance is poor due to unreasonable structural design.

[0004] Patent CN203731913U discloses a heat storage heat exchanger, the heat exchange core of the heat exchanger is composed of a fluid pipeline, an aluminum fin plate and a solid-liquid phase change heat storage material filled in the inner tank, and the cold and hot fluid pipelines composed of two copper tubes are passed through a number of fin plates in a bow shape. In this patent, most of the heat exchange of cold and hot fluids is carried out through solid-liquid phase change materials, and a small part is conducted through the fin plates between the cold and hot fluid tubes. Although the heat storage heat exchanger has the advantages of heat storage and heat exchange can be flexibly separated or carried out simultaneously, and simple manufacturing, the use of tubular fluid passages and square shells makes the device prone to heat storage dead zones and poor heat transfer capacity of cold and hot fluids, which limits the energy density and power density of the device. Similarly, patent CN221036983U discloses a serpentine tube phase change heat storage heat exchanger, which aims to achieve efficient heat exchange between three substances: cold fluid, hot fluid and solid-liquid phase change material through the curved surface structure of the serpentine heat exchange tube. The heat storage heat exchanger also uses a tubular fluid passage, and there is an unreasonable arrangement of the hot and cold fluid pipelines, which limits the energy density and power density of the device. Patent CN104215109A discloses a phase change energy storage device with a microchannel heat exchanger, in which fins are arranged above and below the flat tubes of the heat exchanger to enhance heat transfer, and two independent manifolds are arranged inside the manifold on one side of the flat tube, so that the fluid inlet and outlet are located on the same side of the flat tube, and the fluid flows back after entering the flat tube. The phase change energy storage device has the problems of complex heat transfer structure and large fluid flow resistance, and is not conducive to the arrangement of multiple fluids. Summary of the invention

[0005] The purpose of the present invention is to provide a compact heat storage and heat exchange device and a method for making the same in order to overcome at least one of the defects of the above-mentioned prior art. The compact heat storage and heat exchange device has one or more fluid passages. The fluid flows in a flat tube with a micro-channel. A composite phase change material (phase change heat storage material) with enhanced thermal conductivity is filled between the flat tubes. The orientation direction of the thermal conductive skeleton (sheet-shaped high thermal conductivity material) in the composite phase change material is consistent with the direction of the flow channel in the flat tube to ensure that the heat transfer direction in the high thermal conductivity direction is consistent. The effective thickness of the composite phase change material can be adjusted by adjusting the spacing between the flat tubes. Since each fluid passage is relatively independent, the fluid flow direction can be adjusted by adjusting the pipeline connection method, thereby adjusting the heat storage and release power. The present invention optimizes the heat transfer and heat storage performance in space, improves the energy charging and discharging rate of the heat storage material, and can achieve high energy density and high power density at the device level.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] The first object of the present invention is to provide a compact heat storage and heat exchange device, comprising:

[0008] Flat tube, which is a microchannel parallel flow flat tube, contains multiple parallel channels inside, and is connected to a small header at both ends. The two ends of the flat tube are connected to the side of the small header to form a heat exchanger unit, and the small header is connected to the large header through a connecting pipe;

[0009] A small manifold with slots on the side, into which the parallel flow flat tubes are partially inserted and welded, wherein the internal cross-sectional area of ​​the small manifold is greater than or equal to the sum of the cross-sectional areas of all flow channels inside the parallel flow flat tubes;

[0010] The large collecting pipe has holes on the side and is connected to the small collecting pipe through a connecting pipe;

[0011] The phase change heat storage material is located between the microchannel parallel flow flat tubes, and contains a heat conductive skeleton (sheet-shaped high thermal conductivity material) inside to form a composite phase change material. The direction of high thermal conductivity of the composite phase change material is consistent with the direction of the flow channel (parallel channel) in the flat tube.

[0012] The manufacturing method of the compact heat storage and heat exchange device is as follows: first, parallel flow flat tubes are assembled with two small collecting pipes to form a single heat exchanger unit, and then multiple heat exchanger units are assembled, and then these heat exchanger units are connected in a certain way through a large collecting pipe to obtain a multi-strand flat tube heat exchanger, and then the composite phase change material particles or powders are compressed and formed in the prefabricated heat exchanger interlayer, and the compression direction is parallel to the flat tube surface and perpendicular to the flat tube axis.

[0013] Furthermore, the heat exchanger unit includes two small headers and a flat tube; the two small headers are respectively connected to both ends of the flat tube; the small headers are tubes with side slots, and the side slots are connected to the open end faces of the flat tube.

[0014] Furthermore, the small collecting pipe is a round tube or a square tube with one end closed, one end open and slotted holes on the side.

[0015] Furthermore, the open ends of the two small collecting tubes in the same heat exchanger unit, i.e., the two small collecting tubes connected to the same flat tube, are arranged diagonally and connected to the large collecting tube with side openings to ensure that the fluid distribution in the microchannels of the flat tube is as uniform as possible; the small collecting tubes on the same side in adjacent heat exchanger units are in contact and the open ends of the small collecting tubes on the same side in adjacent heat exchanger units are arranged oppositely; the closed ends of the small collecting tubes are closed by plugs of the small collecting tubes.

[0016] Furthermore, the effective thickness of the small collecting tube in a direction perpendicular to the plane of the flat tube is the same as the thickness of the phase change heat storage material in this direction.

[0017] Furthermore, the phase change heat storage composite material is composed of a mixture of a sheet-like high thermal conductivity material and a phase change material. The high thermal conductivity material and the phase change material are tightly stacked by pressure, and the orientation direction of the sheet-like high thermal conductivity material is consistent with the flow direction in the flat tube.

[0018] Furthermore, the mass fraction of the phase change material in the phase change heat storage composite material is 50% to 95%.

[0019] Furthermore, the sheet-like high thermal conductivity material includes one or more of graphite nanosheets, graphene, copper sheets, aluminum sheets, and boron nitride nanosheets; the phase change material includes one or more of paraffin, fatty acids, polyols, inorganic salt hydrates, inorganic salts, or water.

[0020] Furthermore, the large header is connected to the plurality of heat exchanger units through connecting pipes, and changing their connection form can change the maximum allowable number of heat exchange fluids of the compact heat storage and heat exchange device, wherein the number of large headers is twice the maximum allowable number of heat exchange fluids. Taking a compact heat storage and heat exchange device comprising six groups of heat exchanger units as an example, the connection mode can be AAAAAA (i.e., a single heat exchange fluid, requiring at least two large headers), ABABAB (i.e., two heat exchange fluids, requiring at least four large headers) or ABCABC (i.e., three heat exchange fluids, requiring at least six large headers).

[0021] Furthermore, the maximum allowable number of heat exchange fluid strands is determined according to specific requirements, and is applicable to a single strand of heat exchange fluid, two strands of heat exchange fluids of different types, or three strands, etc.

[0022] In one embodiment of the present invention, the microchannel parallel flat tubes are aluminum flat tubes, and the micro-channels inside the aluminum flat tubes are provided with micro-fins to further enhance convective heat transfer.

[0023] In one embodiment of the present invention, the small collecting tube is a square tube. After multiple heat exchanger units are stacked, the small collecting tube is in close contact with the flat tube without gaps and forms a square cavity for filling phase change heat storage material, thereby maximizing the use of space.

[0024] In one embodiment of the present invention, the phase change heat storage material is a composite material of phase change material and expanded graphite, and the preparation method is: first, the expanded graphite is mixed with a granular or liquid phase change material in a certain proportion (the mass fraction of the phase change material is 50% to 95%), and then the mixture is fully stirred at a temperature higher than the melting point of the phase change material, and then the loose composite material is compressed into a square cavity formed by a small manifold and a flat tube, and the porosity of the composite material after compression is less than 15% (the porosity is the percentage of the air volume in the material to the total volume of the material). The phase change material used is one or more of water, paraffin, fatty acid, polyol, inorganic hydrated salt or inorganic salt.

[0025] In one embodiment of the present invention, after the phase change heat storage material is compressed into the heat exchanger cavity, a potting glue is used on the outside to integrate the phase change heat storage material and the heat exchanger, which can prevent leakage of the phase change material after melting and prevent changes in contact thermal resistance caused by material contraction and expansion.

[0026] A second object of the present invention is to provide a method for manufacturing a compact heat storage and heat exchange device, the method comprising the following steps:

[0027] The flat tube, two small headers (a slot is opened on the side of each small header), a connecting tube and a plug of the small header are welded together to form a heat exchanger unit, wherein both ends of the flat tube are connected to the slot on the side of the small header, the connecting tube is connected to the small header, and the plug of the small header is sealed at one end of the small header;

[0028] Multiple heat exchanger units are stacked and connected in a certain way using a large header with side openings. The large header is connected to the small header through a connecting pipe, and each contact point or surface is fixed by threaded connection or welding;

[0029] The mixed powder or particles of the prefabricated phase change material and the flaky high thermal conductivity material are compressed into the gap between the flat tubes. The compression direction is parallel to the plane of the flat tube and perpendicular to the axis of the flow channel inside the flat tube. The compressed mixed powder or particles of the prefabricated phase change material and the flaky high thermal conductivity material form a phase change heat storage composite material, and finally form a heat storage and heat exchange device with a certain flow channel.

[0030] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0031] 1) The present invention provides a compact heat storage and heat exchange device and a manufacturing method thereof. The present invention spatially optimizes the spatial layout of the microstructure of the phase change heat storage composite material and the heat exchange fluid flow channel, so that the high thermal conductivity direction of the phase change heat storage composite material is consistent with the fluid flow direction in the flat tube, and the contact thermal resistance between the phase change heat storage composite material and the flat tube is reduced by compression treatment;

[0032] 2) The present invention provides a compact heat storage heat exchange device and a manufacturing method thereof. By changing the connection mode between the small header and the large header, the working mode and input / output power of the heat storage heat exchanger can be flexibly adjusted, and the fluid passage can be expanded to three or more to meet the heat exchange and heat storage of multiple fluids;

[0033] 3) The present invention provides a compact heat storage and heat exchange device and a method for manufacturing the same. The device of the present invention has a simple structure, low cost, and is easy to process and manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic structural diagram of the dual-channel compact heat storage and heat exchange device (dual-fluid path heat storage and heat exchange device) in Example 1;

[0035] Figure 2Schematic diagram of the manufacturing method of the dual-channel compact heat storage and heat exchange device (dual-fluid path heat storage and heat exchange device) in Example 1;

[0036] Figure 3 Schematic diagram of a fluid passing through the dual-channel compact heat storage and heat exchange device (dual-fluid path heat storage and heat exchange device) in Example 1 for countercurrent (a) and cocurrent (b) heat exchange with a phase change material;

[0037] Figure 4 This is a schematic diagram of countercurrent heat exchange between two fluids and phase change materials in the dual-channel compact heat storage and heat exchange device (dual-fluid path heat storage and heat exchange device) in Example 1;

[0038] Figure 5 It is a schematic structural diagram of a three-fluid channel compact heat storage and heat exchange device (three-fluid channel heat storage and heat exchange device) in Example 2;

[0039] As shown in the figure: 1- flat tube; 2- small collecting tube; 3- large collecting tube; 4- phase change heat storage material; 5- connecting tube. DETAILED DESCRIPTION

[0040] The present invention realizes a heat storage and heat exchange device with high energy density and high power density by optimizing the heat transfer and heat storage structure. It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as those commonly understood by ordinary technicians in the technical field to which the present application belongs.

[0041] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the technical solution of the present application will be described in detail below in conjunction with specific embodiments. The test materials used in the embodiments of the present invention are all conventional test materials in the art and can be purchased through commercial channels. The features such as preparation means, materials, structures or composition ratios that are not clearly described in this technical solution are all deemed to be common technical features disclosed in the prior art.

[0042] The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several modifications and improvements may be made without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0043] The present invention relates to a compact heat storage and heat exchange device and a manufacturing method thereof. The heat storage and heat exchanger comprises: microchannel parallel flow flat tubes 1, small collecting tubes 2, large collecting tubes 3, and phase change heat storage materials 4, wherein the phase change heat storage materials 4 are located between the microchannel parallel flow flat tubes 1, the two ends of the parallel flow flat tubes 1 are open and connected to the small collecting tubes 2, and the small collecting tubes 2 are connected to the large collecting tubes 3 through connecting tubes 5; the phase change heat storage material 4 contains a heat conductive skeleton to form a composite phase change material, and the high thermal conductivity direction of the composite phase change material is consistent with the flow channel direction in the flat tubes 1. The manufacturing method of the compact heat storage heat exchanger is as follows: first, assemble the parallel flow flat tube 1 with two small manifolds 2 to form a single heat exchanger unit, then assemble multiple heat exchanger units, and then connect these heat exchanger units in a certain way through the large manifold 3 to obtain a multi-strand flat tube 1 heat exchanger, and then compress the composite phase change material particles or powder in the prefabricated multi-strand flat tube 1 heat exchanger interlayer, and the compression direction is parallel to the flat tube 1 surface and perpendicular to the axis of the flat tube 1. Compared with the prior art, the present invention spatially optimizes the spatial layout of the microstructure of the phase change heat storage composite material and the heat exchange fluid flow channel, reduces the contact thermal resistance between the phase change heat storage composite material and the heat exchange flat tube 1, and the working mode and input / output power of the heat storage heat exchanger can be flexibly adjusted by changing the connection method of the small manifold.

[0044] The present invention provides a compact heat storage and heat exchange device, comprising:

[0045] The microchannel parallel flow flat tube 1 contains multiple parallel channels inside, and the two ends are connected to the small collecting pipe 2;

[0046] A small manifold 2 has slots on its side, and the parallel flow flat tube 1 is partially inserted into the slots and welded, wherein the internal cross-sectional area of ​​the small manifold 2 is greater than or equal to the sum of the cross-sectional areas of all the flow channels inside the parallel flow flat tube 1;

[0047] The large collecting pipe 3 has a hole on the side and is connected to the small collecting pipe 2 through a connecting pipe 5;

[0048] The phase change heat storage material 4 is located between the microchannel parallel flow flat tubes 1 and contains a heat conductive skeleton inside to form a composite phase change material. The direction of high thermal conductivity of the composite phase change material is consistent with the flow channel direction in the flat tube 1.

[0049] The manufacturing method of the compact heat storage and heat exchange device is as follows: first, the parallel flow flat tube 1 is assembled with two small collecting pipes 2 to form a single heat exchanger unit, and then multiple heat exchanger units are assembled, and then these heat exchanger units are connected in a certain way through the large collecting pipe 3, and then the composite phase change material particles or powders are compressed and formed in the prefabricated heat exchanger interlayer, and the compression direction is parallel to the plane of the flat tube 1 and perpendicular to the axis of the flat tube 1.

[0050] Preferably, the microchannel parallel flat tube 1 is an aluminum flat tube 1, the large and small headers 2 and the connecting tube 5 are all made of aluminum, and the micro-channels inside the aluminum flat tube 1 have micro-fins to further enhance convective heat transfer. Preferably, the small header 2 is a square tube, and after multiple heat exchanger units are stacked up, the small header 2 is in close contact with the flat tube 1 without gaps and forms a square cavity for filling the phase change heat storage material 4, maximizing the use of space.

[0051] Preferably, the phase change heat storage material 4 is a composite material of phase change material and expanded graphite, and the preparation method is: first, the expanded graphite and the granular or liquid phase change material are mixed in a certain proportion, and then the mixture is stirred evenly under an environment where the temperature is higher than the melting point of the phase change material, and then the loose composite material is compressed into the square cavity formed by the small manifold 2 and the flat tube 1. The phase change material used is one or more of water, paraffin, fatty acid, polyol, inorganic hydrated salt or inorganic salt.

[0052] Example 1

[0053] like Figure 1 to Figure 2 As shown, this embodiment provides a dual-channel compact heat storage and heat exchange device and its manufacturing method and working mode, wherein the dual-channel compact heat storage and heat exchange device comprises a flat tube 1 (microchannel parallel flow flat tube), a small collecting tube 2, a large collecting tube 3, a phase change heat storage material 4 and a connecting tube 5, wherein the flat tube 1 and the small collecting tubes 2 at both ends thereof, and the connecting tube 5 connected to the small collecting tube 2, etc. form a heat exchanger unit, each heat exchanger unit is connected to the large collecting tube 3 through the connecting tube 5, and the phase change heat storage material 4 is filled between the heat exchanger units.

[0054] In this embodiment, the microchannel parallel flow flat tube may have a thickness of 3 to 5 mm, a width of 50 to 500 mm, and a number of holes / channel equivalent diameter of 10 to 1000 μm.

[0055] The large header 3 is connected to the small header 2 via the connecting pipe 5 to form fluid channels with different numbers of fluid streams. The number of the large headers 3 is twice the maximum allowable number of fluid streams.

[0056] See Figure 1 In this embodiment, the small manifold 2 is a square tube with slots on the side connected to the flat tube 1. One end of the small manifold 2 is connected to the connecting tube 5 and the other end is sealed by a plug of the small manifold. The open ends of the two small manifolds 2 connected to the two ends of the same flat tube 1 are arranged diagonally.

[0057] See Figure 2A method for manufacturing a dual-channel compact heat storage and heat exchange device is as follows: ① alternately assemble heat exchanger units with connecting pipes 5, the small headers 2 on the same side of adjacent heat exchanger units are in contact and the open ends of the small headers 2 on the same side of adjacent heat exchanger units are arranged oppositely, so that the distance between the connecting pipes 5 of adjacent heat exchanger units is pulled apart; ② connect the connecting pipes 5 of different heat exchanger units to the large header 3. For this embodiment, the open ends of the two small headers 2 in the same heat exchanger unit are respectively connected to the two large headers 3. Since the open ends of the small headers 2 on the same side of the adjacent heat exchanger units are arranged oppositely, Among the four large collecting tubes 3, the two large collecting tubes 3 located on the same side of the flat tube 1 are alternately connected to the open ends of the small collecting tubes 2, that is, they are connected to the small collecting tubes 2 of different heat exchanger units, while the two large collecting tubes 3 located in the diagonal direction of the flat tube 1 are connected to the small collecting tubes 2 of the same heat exchanger unit; ③ Adjust the heat exchange device with cavity after assembly; ④ Add prefabricated loose phase change heat storage composite material particles into the cavity and mechanically compress them to a certain density (the porosity of the composite material after compression is less than 15% (porosity is the percentage of air volume in the material to the total volume of the material)) to obtain phase change heat storage material 4; ⑤ Obtain a dual-channel compact heat storage and heat exchange device. In step ④, after the phase change heat storage material is compressed into the heat exchanger unit cavity (the cavity here refers to the cavity formed by the flat tubes 1 and the small collecting tubes 2 of adjacent heat exchanger units), the phase change heat storage material 4 and the heat exchanger unit can be packaged integrally with each other using potting glue on the outside, which can prevent the leakage of the phase change material after melting and prevent the change of contact thermal resistance caused by the shrinkage and expansion of the material.

[0058] In this embodiment, the phase change heat storage material 4 is a composite material of phase change material and expanded graphite, and the ratio of phase change material to expanded graphite is 90:10. In this embodiment, the phase change material can be paraffin.

[0059] See Figure 3 In the dual-channel compact heat storage and heat exchange device, the two channels can be fed with the same fluid, which can be flexibly counter-current ( Figure 3 Left a) or downstream ( Figure 3 (b) on the right exchanges heat with the phase change heat storage material 4.

[0060] See Figure 4 In the dual-channel compact heat storage and heat exchange device, two fluids are introduced into the two channels, and heat can also be flexibly exchanged with the phase change heat storage material 4 in a countercurrent manner.

[0061] Example 2

[0062] Similar to Example 1, the following can be made: Figure 5 The three-fluid channel compact heat storage and heat exchange device shown, the specific manufacturing method and fluid channel form can refer to Example 1. Figure 5The heat transfer between the three fluids is shown as a co-current mode.

[0063] like Figure 5 As shown, the connection and arrangement of the large header 3 in the three-fluid channel compact heat storage and heat exchange device of this embodiment are different from those in Embodiment 1. In this embodiment, six large headers 3 are provided. The six large headers 3 are arranged in pairs, and three pairs of large headers 3 are connected to three adjacent heat exchanger units in sequence. Among the three adjacent heat exchanger units, the open end of the small header 2 in the second heat exchanger unit is also closed by a plug of the small header, and the outer side surfaces of the two small headers 2 are opened (the outer side surface refers to the side surface of the small header 2 away from the flat tube 1), and the openings of the outer side surfaces of the two small headers 2 in the same heat exchanger unit are respectively connected to the two large headers 3 through connecting pipes 5, while the open ends of the small headers 2 on the same side in the first heat exchanger unit and the third heat exchanger unit are arranged oppositely, and the two large headers 3 located on the same side of the flat tube 1 are respectively connected to the open ends of the small headers 2 of the first heat exchanger unit and the third heat exchanger unit, that is, the small headers 2 of different heat exchanger units are connected, and the two large headers 3 located in the diagonal direction of the flat tube 1 are connected to the small headers 2 of the same heat exchanger unit.

[0064] The above is a description of the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned description of the embodiments for the convenience of ordinary technicians in the technical field to understand and use the invention. It is obvious that those familiar with the technology in the field can easily make various modifications to these embodiments and apply the general principles described here to other embodiments without creative work. Therefore, the present invention is not limited to the above-mentioned embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A compact heat storage and heat exchange device, characterized in that: include: Flat tube (1), small collecting tube (2), large collecting tube (3), phase change heat storage material (4), connecting tube (5); The two ends of the flat tube (1) are connected to the side of the small collecting tube (2) to form a heat exchanger unit, and the small collecting tube (2) and the large collecting tube (3) are connected through a connecting tube (5); The phase-change heat storage material (4) is located in the channel between adjacent flat tubes (1) and is in close contact with the flat tubes (1); The flat tube (1) is a microchannel parallel flow flat tube.

2. A compact heat storage and heat exchange device according to claim 1, characterized in that: The heat exchanger unit comprises two small headers (2) and a flat tube (1); the two small headers (2) are respectively connected to two ends of the flat tube (1); The small collecting pipe (2) is a pipe with slotted holes on the side, and the slotted holes on the side are connected to the open end surface of the flat pipe (1).

3. A compact heat storage and heat exchange device according to claim 2, characterized in that: The small collecting pipe (2) is a round pipe or a square pipe with one end closed, one end open and slotted holes on the side.

4. A compact heat storage and heat exchange device according to claim 3, characterized in that: The open ends of the two small headers (2) in the same heat exchanger unit are arranged diagonally and connected to the large header (3) with side openings to ensure that the fluid distribution in the microchannels of the flat tubes (1) is as uniform as possible; The closed end of the small collecting tube (2) is closed by a plug of the small collecting tube.

5. A compact heat storage and heat exchange device according to claim 1, characterized in that: The phase change heat storage material (4) is composed of a mixture of a sheet-like high thermal conductivity material and a phase change material. The high thermal conductivity material and the phase change material are closely stacked by pressure, and the orientation direction of the sheet-like high thermal conductivity material is consistent with the direction of the flow channel in the flat tube (1).

6. A compact heat storage and heat exchange device according to claim 5, characterized in that: The sheet-like high thermal conductivity material includes one or more of graphite nanosheets, graphene, copper sheets, aluminum sheets, and boron nitride nanosheets; The phase change material includes one or more of paraffins, fatty acids, polyols, inorganic salt hydrates, inorganic salts or water.

7. A compact heat storage and heat exchange device according to claim 1, characterized in that: The large collecting pipe (3) is connected to the plurality of heat exchanger units via a connecting pipe (5), and the maximum allowable number of heat exchange fluid strands of the compact heat storage and heat exchange device is changed by changing the connection form between the large collecting pipe (3) and the plurality of heat exchanger units, wherein the number of the large collecting pipes (3) is twice the maximum allowable number of heat exchange fluid strands.

8. A compact heat storage and heat exchange device according to claim 1, characterized in that: The phase-change heat storage material (4) is packaged integrally with the heat exchanger unit.

9. A method for manufacturing a compact heat storage and heat exchange device as claimed in claims 1 to 9, characterized in that: The production method comprises the following steps: S1. First, the flat tube (1) is welded to two small collecting tubes (2), and then connected to the connecting tube (5) and the plug of the small collecting tube by threading or welding to form a heat exchanger unit, wherein the two ends of the flat tube (1) are connected to the side of the small collecting tube (2), the connecting tube (5) is connected to one end of the small collecting tube (2), and the other end of the small collecting tube (2) is blocked with a plug; S2, stacking a plurality of heat exchanger units and connecting the heat exchanger units using a large header (3) with side openings, connecting the large header (3) to a connecting pipe (5), and fixing each contact point or surface by threaded connection or welding; S3. Compressing the mixed powder or particles of the prefabricated phase change material and the flaky high thermal conductivity material into the gap between the flat tubes (1), with the compression direction being parallel to the plane of the flat tubes (1) and perpendicular to the axis of the internal flow channel of the flat tubes (1). The compressed mixed powder or particles of the prefabricated phase change material and the flaky high thermal conductivity material form a phase change heat storage material (4), and finally form a heat storage and heat exchange device with a certain flow channel.

10. The method for manufacturing a compact heat storage and heat exchange device according to claim 9, characterized in that: In step S3, the mixed powder or particles of the prefabricated phase change material and the sheet-like high thermal conductivity material are compressed into the gaps between the flat tubes (1), and the porosity of the phase change heat storage material (4) after compression is less than 15%.

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