Microchannel heat exchangers and their heat exchange systems
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG DUNAN MASCH & ELECTRONICS TECH CO LTD
- Filing Date
- 2023-08-01
- Publication Date
- 2026-06-30
Smart Images
Figure CN116772453B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of heat exchange, and in particular to a microchannel heat exchanger and its heat exchange system. Background Technology
[0002] Microchannel heat exchangers are widely used in heat exchange systems to improve heat exchange efficiency through their small channel area and large surface area in contact with air.
[0003] Existing microchannel heat exchangers have limitations in heat exchange efficiency due to the upper limits of both the flow area and heat exchange area of the medium. This is especially true in the fields of small-scale refrigeration and micro-fluid heat exchange, where the heat exchange efficiency of existing microchannel heat exchangers is particularly insufficient, and the strength and durability of the heat exchange tubes are also low. Summary of the Invention
[0004] Based on this, the present invention provides a microchannel heat exchanger to address the above-mentioned technical problems.
[0005] A microchannel heat exchanger includes multiple heat exchange tubes and manifolds disposed at both ends of the heat exchange tubes. Both ends of each heat exchange tube are connected to the manifolds. Each heat exchange tube includes at least three layers of microchannel tubes. Along the width direction of the microchannel tubes, each layer of microchannel tubes has multiple flow paths for medium flow. The three layers of microchannel tubes are arranged along the thickness direction of the heat exchange tubes to form a third layer, a second layer, and a first layer. One end of the third layer is connected to one end of the second layer on the same side via an elbow, and the other end of the second layer is connected to one end of the first layer on the same side via an elbow. One of the third layer and the first layer is connected to one manifold, and the other is connected to another manifold.
[0006] With this design, when the medium enters the heat exchange tube from the manifold, it flows in an S-shaped or serpentine path within the heat exchange tube, extending the flow path of the medium, increasing the contact area and contact time with air, and improving heat transfer efficiency. Moreover, the heat exchange tube, composed of three layers of microchannel tubes, is thicker and has higher structural strength than existing heat exchange tubes, thus extending its service life.
[0007] In one embodiment, the thickness of a single heat exchange tube is 0.2mm-20mm. This setting avoids the heat exchange tube being too thin, which would lead to excessively high manufacturing difficulty and make it difficult to set up three layers of microchannel tubes; it also prevents the heat exchange tube from being too thick, which would occupy too much space inside the microchannel heat exchanger and lose the advantages of the microchannel heat exchanger such as small size, large contact area with air, and high heat exchange efficiency.
[0008] In one embodiment, the cross-sectional shape of the flow path is rectangular, with a width D1 and height D2 of 200 μm-1000 μm; and / or, the cross-section of the flow path is circular, with a diameter D3 of 100 μm-800 μm; and / or, the cross-section of the flow path is arc-shaped, with an inner diameter D4 and outer diameter D5 of 200 μm-1000 μm; and / or, the cross-section of the flow path is elliptical, with a major axis D6 and minor axis D7 of 100 μm-800 μm, and the minor axis D7 being smaller than the major axis D6. This arrangement prevents the rectangular, circular, or elliptical shapes from being too large, which could affect the strength of the heat exchange tube, and also avoids the rectangular shape being too small, resulting in insufficient flow area and excessive pressure on the inner wall of the flow path when the medium flows through.
[0009] In one embodiment, the flow area of the three layers of microchannel tubes gradually increases along the thickness direction of the heat exchange tubes. This arrangement allows the required flow area of the medium to gradually increase or decrease during heat exchange, and the gradually increasing flow area of the three layers of microchannel tubes can adapt to the phase change process of the medium.
[0010] In one embodiment, the first layer has a plurality of evenly spaced flow paths with arc-shaped cross-sections, the second layer has a plurality of evenly spaced flow paths with rectangular cross-sections, and the third layer has a plurality of evenly spaced flow paths with elliptical cross-sections. With this configuration, since the flow area of the arc-shaped cross-section flow path is the smallest and the flow area of the elliptical cross-section flow path is the largest for the same dimensions, the flow area can gradually increase from the first layer to the third layer, and gradually decrease from the third layer to the first layer.
[0011] In one embodiment, the ratio of the number of flow paths with rectangular cross-sections, elliptical cross-sections, and arc-shaped cross-sections is 3:2:1. This arrangement facilitates the calculation of the opening diameter of each flow path with a rectangular, elliptical, or arc-shaped cross-section based on the required flow area of each layer of microchannel tubes, ensuring a gradual increase or decrease in the flow area between the three layers of microchannel tubes.
[0012] In one embodiment, an insulating layer is provided between adjacent layers of microchannel tubes. This arrangement prevents heat transfer between the layers of microchannel tubes, thus protecting heat exchange efficiency. The insulating layer also supports the microchannel tubes, withstands their pressure, and improves the structural strength of the heat exchange tubes.
[0013] In one embodiment, the insulating layer is made of ceramic, copper, or an aluminum alloy. This design allows the ceramic material to maintain good chemical stability at high temperatures due to its high melting point.
[0014] In one embodiment, the thickness of the insulating layer is 0.1 to 0.3 times the thickness of the heat exchange tube; the thickness of one layer of the microchannel tube is 0.05 mm to 0.15 mm.
[0015] This design avoids the insulation layer being too thin to effectively isolate heat transfer and to provide adequate support and pressure resistance; it also prevents the insulation layer from being too thick, which would affect the layout of the heat exchange tubes, waste materials, and increase costs.
[0016] The present invention also provides a heat exchange system, including the microchannel heat exchanger as described above.
[0017] Compared to existing technologies, this invention incorporates three layers of microchannel tubes within each heat exchange tube, causing the medium to flow in an S-shaped path after entering the heat exchange tube. This extends the flow path of the medium, increases the contact area and contact time with air, and improves heat transfer efficiency. Furthermore, the three-layer microchannel tube structure increases the thickness of the heat exchange tube, enhancing structural strength and extending its service life. An insulating layer is also placed between each microchannel tube layer, with its thickness carefully controlled to both isolate heat transfer between layers and withstand pressure, further strengthening the heat exchange tube's structure. Attached Figure Description
[0018] Figure 1 A cross-sectional view of the heat exchange tube provided by the present invention;
[0019] Figure 2 This is a cross-sectional schematic diagram of the rectangular microchannel tube provided by the present invention;
[0020] Figure 3 This is a cross-sectional schematic diagram of the circular microchannel tube provided by the present invention;
[0021] Figure 4 A cross-sectional schematic diagram of the elliptical microchannel tube provided by the present invention;
[0022] Figure 5 A cross-sectional schematic diagram of the arc-shaped microchannel tube provided by the present invention;
[0023] Figure 6 A perspective view of the heat exchange tube provided by the present invention;
[0024] Figure 7 for Figure 6 Enlarged partial sectional view at point A in the image;
[0025] Figure 8 for Figure 6 Enlarged partial cross-sectional view of point B from another angle;
[0026] Figure 9A perspective view of the microchannel heat exchanger provided by the present invention;
[0027] Figure 10 This is a schematic diagram of the microchannel heat exchanger provided by the present invention;
[0028] Figure 11 for Figure 10 A magnified view of section C in the image.
[0029] The symbols in the diagram represent the following meanings:
[0030] 100. Microchannel heat exchanger; 101. Heat exchange tube; 10. Microchannel tube; 11. Third layer; 12. Second layer; 13. First layer; 14. Insulation layer; 15. Elbow; 17. Flow path; 102. Manifold. Detailed Implementation
[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0032] It should be noted that when a mechanism is referred to as being "fixed to" or "set on" another mechanism, it can be directly on the other mechanism or there may be an intervening mechanism. When a mechanism is considered to be "connected to" another mechanism, it can be directly connected to the other mechanism or there may be an intervening mechanism. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.
[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0034] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0035] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.
[0036] Please see Figure 1 as well as Figures 9-11 The present invention provides a microchannel heat exchanger 100, which is applied in a heat exchange system to exchange heat with the outside world for cooling or heating.
[0037] The microchannel heat exchanger 100 includes multiple heat exchange tubes 101 and manifolds 102 located at both ends of the heat exchange tubes 101. Both ends of each heat exchange tube 101 are connected to a manifold 102, and the medium in one manifold 102 can flow through the heat exchange tube 101 to the other manifold 102. In this way, the multiple heat exchange tubes 101 are essentially connected in parallel. After the medium enters from a manifold 102 on one side of the microchannel heat exchanger 100, it can simultaneously enter each heat exchange tube 101 connected to that manifold 102. The multiple heat exchange tubes 101 work simultaneously, exchanging heat with the outside environment, which greatly enhances the heat exchange efficiency of the microchannel heat exchanger 100.
[0038] In one embodiment, a single heat exchange tube 101 comprises three layers of microchannel tubes 10, each layer of which has multiple flow paths 17 for medium flow. These flow paths 17 are spaced apart along the width of each layer of microchannel tube 10. The three layers of microchannel tubes 10 are arranged along the thickness of the heat exchange tube 101, forming a third layer 11, a second layer 12, and a first layer 13 in sequence. One end of the third layer 11 is connected to the end of the second layer 12 on the same side via a bend 15, and the other end of the second layer 12 is connected to the end of the first layer 13 on the same side via a bend 15. One of the third layer 11 and the first layer 13 is connected to a manifold 102, and the other is connected to another manifold 102. Thus, when the medium enters the heat exchange tube 101 from the manifold 102, it flows in an S-shaped or serpentine path within the heat exchange tube 101, extending the flow path of the medium, increasing the contact area and contact time with air, and improving heat transfer efficiency. Moreover, the heat exchange tube 101, which consists of three layers of microchannel tubes 10, is thicker and has higher structural strength than existing heat exchange tubes, thus extending its service life.
[0039] Of course, in other embodiments, the number of layers of the microchannel tube 10 is not limited to three. For example, the number of layers of the microchannel tube 10 can be set to two, four, five, or six layers, etc. The specific number of layers of the microchannel tube 10 can be set according to the needs of actual applications.
[0040] In this embodiment, a three-layer microchannel tube 10 is used as an example for detailed explanation. The three layers of microchannel tube 10 are bonded together by a curing adhesive, thereby achieving the connection of the three layers of microchannel tube 10 along the thickness direction of the heat exchange tube 101, making them a whole. In other embodiments, the three layers of microchannel tube 10 can also be connected by pressing or welding, etc., and are not limited to the above-mentioned bonding, as long as the connection can be achieved.
[0041] Specifically, the thickness of a single heat exchange tube 101 is 0.2mm-20mm. This avoids the heat exchange tube 101 being too thin, which would lead to excessively high manufacturing difficulty and make it difficult to set up a three-layer microchannel tube 10; it also prevents the heat exchange tube 101 from being too thick, which would occupy too much space inside the microchannel heat exchanger 100 and lose the advantages of the microchannel heat exchanger 100 such as small size, large contact area with air, and high heat exchange efficiency.
[0042] The cross-sectional shape of the flow path 17 can be configured in various ways, and different cross-sectional shapes are closely related to the flow area of the flow path 17.
[0043] For example, please see Figure 2The cross-sectional shape of the flow path 17 is rectangular to facilitate processing and installation. The width D1 and height D2 of the rectangular flow path 17 are 200μm-1000μm. The specific values should be adjusted according to the thickness and width of the heat exchange tube 101 to prevent the rectangle from being too large and affecting the strength of the heat exchange tube 101, and also to avoid the rectangle being too small, resulting in insufficient flow area and excessive pressure on the inner wall of the microchannel tube 10 when the medium flows through.
[0044] Please see Figures 3-4 In other embodiments, the cross-sectional shape of the flow path 17 can also be circular. The diameter D3 of the circular cross-section flow path 17 is 100μm-800μm, and its technical effect is similar to that described above, so it will not be repeated here. The cross-sectional shape of the flow path 17 can also be elliptical. The flow area of the circular and elliptical cross-section flow path 17 is larger than that of the rectangular cross-section. Understandably, the major diameter D6 and minor diameter D7 of the elliptical microchannel tube 10 can also be adjusted according to the working conditions. Preferably, the major diameter D6 and minor diameter D7 are also 100μm-800μm, and the minor diameter D7 is smaller than the major diameter D6.
[0045] Please see Figure 5 The cross-sectional shape of the flow path 17 can also be arc-shaped, and the inner diameter D4 and outer diameter D5 of the arc-shaped flow path 17 are 200μm-1000μm, with the outer diameter D5 being larger than the inner diameter D4. The arc-shaped flow path 17 has a small flow area, which allows the medium to maintain a high flow velocity when flowing in it. Moreover, the arc-shaped microchannel tube 10 has good structural strength and can withstand the stress brought about by the high-speed flowing medium.
[0046] Understandably, the cross-section of the flow path 17 can also be changed to a shape not mentioned above, such as a triangle, rhombus, or trapezoid, depending on the working requirements, and is not limited to the four shapes mentioned above. Furthermore, the cross-sectional shape of the flow path 17 in the three-layer microchannel tube 10 does not necessarily have to be different. For example, all three layers, or two of the three layers, can be set as flow paths 17 with rectangular or circular cross-sections. The flow area of each layer can be set by adjusting the number of rectangles, and the corresponding technical effect can still be achieved.
[0047] Furthermore, along the thickness direction of the heat exchange tube 101, the flow area of the three layers of microchannel tubes 10 gradually increases. That is, along the thickness direction, the flow area of the next layer of microchannel tube 10 is greater than the flow area of the adjacent upper layer of microchannel tube 10. Here, the flow area of the microchannel tube 10 refers to the sum of the cross-sectional areas of the multiple flow paths 17 opened in the microchannel tube 10. Thus, taking the refrigeration process as an example, with the first layer 13 having the smallest flow area and the third layer 11 having the largest flow area: the medium first enters the first layer 13. Since the initial state of the medium is a low-temperature liquid (at this time, the microchannel heat exchanger 100 is used as an evaporator), if the flow area of the first layer 13 is small, the flow velocity of the liquid medium will increase. At the same time, because the medium has just flowed into the microchannel tube 10, the temperature difference between the medium and the outside air is the largest, that is, the heat exchange effect with the outside air is the best. The increased flow velocity of the medium can optimize this phenomenon to the greatest extent, that is, further improve the heat exchange efficiency. As the medium continues to exchange heat with the outside air and reaches the second layer 12, a phase change (evaporation and heat absorption) occurs. Part of the liquid refrigerant transforms into a gaseous state, and since the volume of the gaseous state is greater than that of the liquid state, the required flow area for the second layer 12 (the next layer) is greater than that for the first layer 13 (the adjacent upper layer). As the refrigerant continues to exchange heat with the outside air in the second layer 12, its vaporization becomes increasingly pronounced, and the gaseous refrigerant becomes the dominant component. At this point, the third layer 11 needs the largest flow area to ensure the smooth outflow of the gaseous refrigerant; that is, the flow area of the third layer 11 (the next layer) is greater than the fluid area of the second layer (the adjacent upper layer).
[0048] The flow direction of the heating and cooling media is opposite. Specifically: the medium is compressed at high temperature (compressor) to become a high-temperature, high-pressure gas, and enters the microchannel heat exchanger 100 (which acts as a condenser at this time). Since the medium is initially gaseous, it requires the largest flow area from the very beginning, so it first enters the third layer 11. During heat exchange with the air, the high-temperature gaseous medium gradually condenses and liquefies due to cooling, entering the second layer 12. As the gaseous medium gradually condenses and liquefies, its required flow area decreases, meaning the flow area of the second layer 12 can be smaller than that of the third layer 11. As the heat exchange process continues, more and more liquid condenses in the medium, so the flow area of the first layer 13 can be minimized.
[0049] Furthermore, please see Figure 1 as well as Figures 6-8Along the width of the microchannel tube 10, or the first layer 13, the first layer 13 includes multiple evenly spaced flow paths 17 with circular cross-sections, the second layer 12 includes multiple evenly spaced flow paths 17 with rectangular cross-sections, and the third layer 11 includes multiple evenly spaced flow paths 17 with elliptical cross-sections. The medium flows from the first layer 13 through the second layer 12 to the third layer 11, or from the third layer 11 through the second layer 12 to the first layer 13. Thus, for the same dimensions, the flow area of the circular cross-section flow path 17 is the smallest, and the flow area of the elliptical microchannel tube 10 is the largest. Therefore, the flow area gradually increases from the first layer 13 to the third layer 11, and gradually decreases from the third layer 11 to the first layer 13.
[0050] Of course, in other embodiments, the flow path 17 with an elliptical cross-section can also be replaced with a flow path 17 with a circular cross-section, and the flow path 17 with a rectangular cross-section can also be replaced with a square or trapezoidal flow path 17. There are various embodiments for the cross-sectional shape of the flow path 17, as long as it can achieve control of the flow area.
[0051] Furthermore, in the three-layer microchannel tube 10, the ratio of the number of flow paths 17 with rectangular cross-sections, elliptical cross-sections, and arc-shaped cross-sections is 3:2:1. This facilitates the calculation of the opening diameter of each flow path 17 with a rectangular, elliptical, or arc-shaped cross-section based on the required flow area of each layer of microchannel tube 10, ensuring a gradual increase or decrease in the flow area among the three layers of microchannel tube 10.
[0052] An insulating layer 14 is provided between adjacent layers of microchannel tubes 10. The insulating layer 14 can prevent heat transfer between the layers of microchannel tubes 10, thus preventing any impact on heat exchange efficiency. The insulating layer 14 also serves to support the layers of microchannel tubes 10, withstand the pressure of the microchannel tubes 10, and improve the structural strength of the heat exchange tube 101. It should be noted that the insulating layer 14 between adjacent layers of microchannel tubes 10 can mean that an insulating layer 14 can be provided between every two adjacent layers, or it can be provided only between some of the adjacent layers.
[0053] Of course, in other embodiments, adjacent microchannel tubes 10 can also be directly bonded together without the insulation layer 14, thereby saving materials, reducing processing costs and processing difficulty.
[0054] Preferably, the insulating layer 14 is made of ceramic, which has a high melting point and maintains good and stable chemical properties at high temperatures. In other embodiments, the insulating layer 14 may also be made of materials such as copper or aluminum alloy to reduce costs.
[0055] Furthermore, the thickness of the insulation layer 14 is 0.1 to 0.3 times the thickness of the heat exchange tube 101. This establishes a reasonable thickness range for the insulation layer 14, preventing it from being too thin to effectively insulate against heat transfer and to provide adequate support and pressure resistance; it also prevents the insulation layer 14 from being too thick, which would affect the layout of the heat exchange tube 101, waste materials, and increase costs.
[0056] The thickness of each microchannel tube 10 is preferably set to 0.05mm-0.15mm to suit most application scenarios. Within this range, the insulation layer 14 can provide both good thermal insulation and sufficient pressure-bearing structural strength.
[0057] Furthermore, by way of example, the microchannel heat exchanger 100 is made of copper, aluminum alloy, or heat-resistant plastic. Copper is relatively soft and easy to process; aluminum alloy and heat-resistant plastic are inexpensive. The material of the microchannel heat exchanger 100 can be flexibly replaced according to working requirements to adapt to different heat transfer needs, which can effectively reduce manufacturing costs and improve product adaptability.
[0058] The present invention also provides a heat exchange system, including the microchannel heat exchanger 100 as described above.
[0059] Compared to existing technologies, this invention, by incorporating three layers of microchannel tubes 10 within each heat exchange tube 101, allows the medium to flow in an S-shaped or serpentine path within the heat exchange tube 101 after entering, thus extending the flow path, increasing the contact area and contact time with air, and improving heat transfer efficiency. Furthermore, the heat exchange tube 101, composed of three layers of microchannel tubes 10, has increased thickness, enhanced structural strength, and extended service life. An insulating layer 14 is also provided between each layer of microchannel tubes 10, with its thickness carefully controlled to both isolate heat transfer between layers and withstand pressure, thereby improving the structural strength of the heat exchange tube 101.
[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0061] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. A microchannel heat exchanger, comprising a plurality of heat exchange tubes (101) and a manifold (102) disposed at both ends of the heat exchange tubes (101), wherein both ends of each heat exchange tube (101) are respectively connected to the manifold (102); Its features are, The single heat exchange tube (101) includes at least three layers of microchannel tubes (10). Along the width direction of the microchannel tubes (10), each layer of microchannel tubes (10) is provided with multiple flow paths (17) for medium flow. The three layers of microchannel tubes (10) are arranged along the thickness direction of the heat exchange tube (101) to form a third layer (11), a second layer (12), and a first layer (13). One end of the third layer (11) is connected to the end of the second layer (12) on the same side through an elbow (15). The other end of the second layer (12) is connected to the end of the first layer (13) on the same side through an elbow (15). One of the third layer (11) and the first layer (13) is connected to one of the manifolds (102), and the other is connected to another manifold (102). Along the thickness direction of the heat exchange tube (101), the flow area of the three layers of microchannel tubes (10) gradually increases.
2. The microchannel heat exchanger according to claim 1, characterized in that, The thickness of a single heat exchange tube (101) is 0.2 mm to 20 mm.
3. The microchannel heat exchanger according to claim 1, characterized in that, The cross-sectional shape of the flow path (17) is rectangular, and the width D1 and height D2 of the flow path (17) are 200μm-1000μm; and / or, The cross-section of the flow path (17) is circular, and the diameter D3 of the flow path (17) is 100μm-800μm; and / or, The cross-section of the flow path (17) is arc-shaped, and the inner diameter D4 and outer diameter D5 of the flow path (17) are 200μm-1000μm; and / or, The cross-section of the flow path (17) is elliptical. The major axis D6 and minor axis D7 of the flow path (17) are 100μm-800μm, and the minor axis D7 is smaller than the major axis D6.
4. The microchannel heat exchanger according to any one of claims 1-3, characterized in that, The first layer (13) has multiple flow paths (17) with a circular arc cross-section arranged at uniform intervals, the second layer (12) has multiple flow paths (17) with a rectangular cross-section arranged at uniform intervals, and the third layer (11) has multiple flow paths (17) with an elliptical cross-section arranged at uniform intervals.
5. The microchannel heat exchanger according to claim 4, characterized in that, The ratio of the number of flow paths (17) with rectangular cross-section, flow paths (17) with elliptical cross-section, and flow paths (17) with arc cross-section is 3:2:
1.
6. The microchannel heat exchanger according to any one of claims 1-3, characterized in that, An insulating layer (14) is provided between the microchannel tubes (10) of adjacent layers.
7. The microchannel heat exchanger according to claim 6, characterized in that, The insulating layer (14) is made of ceramic, copper, or aluminum alloy.
8. The microchannel heat exchanger according to claim 6, characterized in that, The thickness of the insulation layer (14) is 0.1 to 0.3 times the thickness of the heat exchange tube (101), and the thickness of the microchannel tube (10) is 0.05 mm to 0.15 mm.
9. A heat exchange system, characterized in that, Including the microchannel heat exchanger as described in any one of claims 1-8.