A serpentine tube microchannel heat exchanger

Abstract

The utility model provides a kind of serpentine tube microchannel heat exchanger, including m (m is greater than or equal to 2) flat tubes with microchannel inside, the m flat tubes are simultaneously folded into n (n is greater than or equal to 1) times back-and-forth serpentine tube unit, m flat tubes are connected in parallel between two distribution heads, distribution head divides heat exchange medium into m parts, respectively flows into m flat tubes;Insertion fin is installed on the flat tube.The utility model provides a kind of serpentine tube microchannel heat exchanger, can effectively reduce microchannel heat exchanger shunt number, improve the balance of heat exchange medium evaporation, improve the condensation problem of heat exchanger, more effectively reduce cost.

Description

Technical Field

[0001] This utility model relates to a serpentine tube microchannel heat exchanger. Background Technology

[0002] The serpentine tube microchannel heat exchanger is a new type of heat exchanger developed based on the ordinary microchannel heat exchanger, used to improve heat exchange efficiency. However, existing serpentine tube microchannel heat exchangers have the following problems: (1) The inlet and outlet ports of the existing serpentine tube microchannel heat exchanger are not integrated for liquid separation, which increases the number of flow paths of the microchannel heat exchanger and increases the manufacturing cost. (2) Existing serpentine tube microchannel heat exchangers are located in the same wind field, but there is a large wind speed deviation in different areas of the actual wind field, which leads to uneven evaporation of the heat exchange medium. (3) Existing serpentine tube microchannel heat exchangers cannot be used in scenarios where water splashing is to be avoided in air supply, because the air humidity is high and condensation is easily generated at the inlet of the liquid phase of the heat exchange medium. (4) If the existing serpentine tube microchannel heat exchanger is used in a system with two or more compressors, when the system stops running one compressor, the corresponding serpentine tube microchannel heat exchanger does not participate in heat exchange, which is wasteful. Summary of the Invention

[0003] In view of this, the present invention provides a serpentine tube microchannel heat exchanger, which can effectively reduce the number of flow paths in the microchannel heat exchanger, improve the uniformity of heat exchange medium evaporation, improve the condensation problem of the heat exchanger, and more effectively reduce costs.

[0004] To address the aforementioned problems, embodiments of this utility model provide a liquid distribution structure for a serpentine tube microchannel heat exchanger, characterized by: It includes m (m≥2) flat tubes with internal microchannels. The m flat tubes are simultaneously folded into n (n≥1) round trip serpentine tube units. The m flat tubes are connected in parallel between two liquid separators. The liquid separators divide the heat exchange medium into m parts, which flow into the m flat tubes respectively. Insertion fins are installed on the flat tubes.

[0005] Furthermore, the liquid separator is a one-to-two liquid separator, which includes a main structure, an internal cavity, a partition in the middle of the cavity, the partition dividing the cavity into two independent and parallel chambers, and sealing plates on both sides of the main structure for sealing the two chambers. The main structure has a fluid inlet hole on its side wall. The end of the fluid inlet hole is connected to two branch channels. The end of the fluid inlet hole is perpendicular to the two branch channels. The two branch channels are respectively connected to the channels on both sides of the partition. The channels on both sides are respectively connected to their corresponding chambers. The sealing plate has a flat tube slot at the corresponding chamber. The flat tube slot is used to insert and connect to the serpentine tube. Alternatively, one side of the sealing plate has an inlet hole, and the side of the partition plate includes two channels, both of which are connected to the inlet hole and are connected to two chambers respectively. The other side of the sealing plate has a flat tube slot at the corresponding chamber, and the flat tube slot is used to insert and connect to the serpentine tube.

[0006] Furthermore, the liquid distribution head is a multi-liquid distribution head, comprising an inlet plate, a channel plate, a flow distribution orifice plate, a chamber plate, and a sealing plate connected in sequence; the inlet plate is provided with a fluid inlet, the channel plate is provided with at least two flow distribution channels, the fluid inlet is connected to the flow distribution channels, the flow distribution orifice plate is provided with flow distribution holes, and the end of each flow distribution channel is connected to a flow distribution hole; the chamber plate is provided with several parallel liquid distribution chambers of equal size; and the sealing plate is provided with flat tube slots, each flat tube slot corresponding to and connected to a liquid distribution chamber, the flat tube slots being used to insert and connect to a flat tube.

[0007] Furthermore, the fin includes a sheet-like main board, on one side of which multiple slots are formed, and flat tubes are inserted into each slot.

[0008] Furthermore, the number of flat tubes in the serpentine tube unit is two or four.

[0009] Furthermore, the number of the serpentine tube units includes two sets, with the outer flat tubes of the two sets of serpentine tube units respectively connected to a dispensing head, and the inner flat tubes of the two sets of serpentine tube units connected to the same dispensing head.

[0010] Furthermore, the serpentine tube unit contains two flat tubes.

[0011] This utility model also proposes a liquid distribution structure for a serpentine tube microchannel heat exchanger, which is characterized by: It includes two flat tubes with internal microchannels, which are simultaneously folded into a serpentine tube unit that travels n (n≥1) times. Each flat tube is connected to a manifold distributor at both ends, and insertable fins are installed on the flat tubes.

[0012] Furthermore, the fin includes a sheet-like main board, on one side of which multiple slots are formed, and flat tubes are inserted into each slot.

[0013] Furthermore, heat exchange medium is introduced into the two flat tubes through a manifold distributor. The flow direction of the heat exchange medium can be the same or opposite.

[0014] Compared with the prior art, the serpentine tube microchannel heat exchanger proposed in this utility model has at least the following beneficial effects: (1) The double serpentine tubes of this serpentine tube microchannel heat exchanger have multiple inlets and outlets, which facilitates integrated liquid distribution and can effectively reduce the number of flow paths in the heat exchanger. (2) The double serpentine tubes of the serpentine tube microchannel heat exchanger pass through the same wind field simultaneously, which makes the evaporation of the heat exchange medium more balanced for wind fields with large wind speed deviations. (3) The double serpentine tubes of the serpentine tube microchannel heat exchanger pass through the same air field on both sides, which can effectively avoid the condensation caused by the mixing of air after passing through the heat exchanger. (4) The double serpentine tubes of the serpentine tube microchannel heat exchanger can be applied to two or more compressor systems. When one compressor is stopped, the air side application area is maximized.

[0015] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural diagram of the serpentine tube microchannel heat exchanger proposed in this utility model; Figure 2 for Figure 1 Exploded view; Figure 3 for Figure 1 Flow path diagram of a serpentine tube microchannel heat exchanger; Figure 4 This is a structural diagram of a double serpentine tube microchannel heat exchanger; Figure 5 This is a structural diagram of a one-to-four serpentine tube microchannel heat exchanger. Figure 6 This is a serpentine tube microchannel heat exchanger with inlets and outlets on both sides; Figure 7 for Figure 6 Exploded view; Figure 8 for Figure 6 Flow path diagram of the serpentine tube microchannel heat exchanger with inlet and outlet on both sides; Figure 9Right view of the internal structure of a 1-to-2 dispensing head; Figure 10 Left view of the internal structure of a 1-to-2 dispensing head; Figure 11 A front view of the internal structure of a 1-to-2 dispensing head; Figure 12 An isometric view of the internal structure of a 1-to-2 separator; Figure 13 An exploded view of the internal structure of a 1-to-4 dispensing head; Figure 14 A simulation model of the volume fraction and flow rate of R32 refrigerant in a two-phase state in a liquid separator is used for a one-to-two liquid separator head. Figure 15 The refrigerant volume distribution ratio after liquid separation by a one-to-two separator head at a flow rate of 20 kg / h. Figure 16 This is a flow diagram of the refrigerant after separation by a one-to-two separator at a flow rate of 20 kg / h. Figure 17 This describes the flow rate of refrigerant at a flow rate of 20 kg / h, after being separated by a one-to-two separator, as it enters the inlet of each microchannel flat tube.

[0018] In the diagram: fin 3, 11~15-distribution head, 16~19-manifold assembly, 21~28-serpentine tube, 29-main structure, 30-chamber, 31-partition plate, 32-fluid inlet, 33-branch channel, 34-channel, 35-inlet plate, 36-channel plate, 37-distribution plate, 38-chamber plate, 39-sealing plate, 111, 121, 161, 171, 181, 191-pipe opening, 112~115, 122~125, 162, 192-flat tube slot, 271, 272, 281, 282-flat tube opening. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. This utility model is intended for more general application in socket-type heating pipes; therefore, it can be used in any practical application with specific requirements.

[0020] This utility model provides a serpentine tube microchannel heat exchanger, comprising m (m≥2) flat tubes with internal microchannels, wherein the m flat tubes are simultaneously folded into n (n≥1) round trip serpentine tube units, the m flat tubes are connected in parallel between two liquid distributors, the liquid distributors divide the heat exchange medium into m portions, which flow into the m flat tubes respectively; insert-type fins are installed on the flat tubes.

[0021] Example 1 See Figure 1 and Figure 2 This embodiment provides a finned multi-serpentine tube microchannel heat exchanger, which is a four-in-four-out structure. The serpentine tube unit wraps around four flat tubes, and the four flat tubes are folded into serpentine tube units that go back and forth twice, namely serpentine tube 21, serpentine tube 22, serpentine tube 23, and serpentine tube 24. The four flat tubes are connected in parallel between two liquid distributors 11 and 12. The liquid distributors divide the heat exchange medium into four parts, which flow into the four flat tubes respectively. Multiple rows of insertable fins 3 are inserted laterally into the serpentine tube unit.

[0022] When designing a larger heat exchanger, serpentine tubes 21, 22, 23, and 24 can be folded into a serpentine structure with more reciprocating motions. The length of the serpentine tubes can be modified accordingly based on the required size of the heat exchanger.

[0023] The liquid separator 11 and liquid separator 12 can be a liquid separator block structure that divides into four or a gas collection block structure, or other liquid separator or gas collection structures that have the function of dividing into multiple liquids.

[0024] See Figure 13 A multi-dispensing head is provided, comprising an inlet plate 35, a channel plate 36, a flow distribution plate 37, a chamber plate 38, and a sealing plate 39 connected in sequence. The inlet plate has a fluid inlet, the channel plate has at least two flow distribution channels, the fluid inlet is connected to the flow distribution channels, the flow distribution plate has flow distribution holes, and the end of each flow distribution channel is connected to a flow distribution hole. The chamber plate has several parallel dispensing chambers of equal size, and the sealing plate has a flat tube slot, each flat tube slot corresponding to and connected to a dispensing chamber. The flat tube slot is used to insert and connect a flat tube.

[0025] See Figure 1 and Figure 2In this embodiment, the multi-dispensing head is a four-dispensing head with four flat tube slots. The flat tube slot 211 of the serpentine tube 21 is inserted into the flat tube slot 112 of the dispensing head 11, the flat tube slot 221 of the serpentine tube 22 is inserted into the flat tube slot 113 of the dispensing head 11, the flat tube slot 231 of the serpentine tube 23 is inserted into the flat tube slot 114 of the dispensing head 11, and the flat tube slot 241 of the serpentine tube 24 is inserted into the flat tube slot 115 of the dispensing head 11. The flat end 212 of the serpentine tube 21 is inserted into the flat end 125 of the separator head 12; the flat end 222 of the serpentine tube 22 is inserted into the flat end 124 of the separator head 12; the flat end 232 of the serpentine tube 23 is inserted into the flat end 123 of the separator head 12; and the flat end 242 of the serpentine tube 24 is inserted into the flat end 122 of the separator head 12. Fins 3 are inserted into the exterior of the serpentine tubes 21, 22, 23, and 24.

[0026] Specifically, see Figure 1 and Figure 2 The fin 3 includes a sheet-like main board, on one side of which multiple slots are opened, and flat tubes are inserted into each slot.

[0027] See Figure 3 The liquid heat exchange medium enters the distributor 11 through port 111 and is evenly divided into four streams, which then flow into serpentine tubes 21, 22, 23, and 24 respectively. The heat exchange medium undergoes a phase transition from liquid to gas in serpentine tubes 21, 22, 23, and 24 before flowing into the distributor 12. The gaseous heat exchange medium in the distributor 12 flows out of the heat exchanger through port 121.

[0028] Of course, the liquid heat exchange medium can also enter the heat exchanger through the port 121 of the distributor 12 and flow out of the heat exchanger through the port 111 of the distributor 11. The flow direction of the heat exchange medium can also be reversed. The heat exchange medium applicable to the finned multi-serpentine tube microchannel heat exchanger proposed in this utility model can also enter in the gas phase and flow out in the liquid phase, that is, the finned multi-serpentine tube microchannel heat exchanger can be used in both condensers and evaporators.

[0029] Example 2 See Figure 4 A type of insert-type double serpentine tube microchannel heat exchanger is disclosed. The working principle of this insert-type double serpentine tube microchannel bent heat exchanger is similar to that of the insert-type multi-serpentine tube microchannel heat exchanger proposed in Example 1, with the main difference being in the structure. The serpentine tube unit wraps around two flat tubes, and its serpentine tubes 25 and 26 undergo five round trip bends. The total length of serpentine tubes 25 and 26 is also correspondingly increased.

[0030] Figure 4 The separator 11 in the middle is a one-to-two separator, see [link]. Figures 9 to 12It includes a main structure 29, with an internal cavity. A partition 31 is provided in the middle of the cavity, dividing the cavity into two independent and parallel chambers 30. Sealing plates (not shown in the figure) are provided on both sides of the main structure 29. Fluid inlets 32 are provided on the side walls of the main structure 29. Fluid inlets 32 are used to connect with external media pipes. The ends of the fluid inlets are connected to two branch channels 33. The ends of the fluid inlets 32 are perpendicular to the two branch channels 33. The two branch channels 33 are respectively connected to channels 34 provided on both sides of the partition 31. The channels 34 on both sides are respectively connected to their corresponding chambers 30. Flat tube slots are provided on the sealing plates at the corresponding chambers. The flat tube slots are used to insert and connect to serpentine tubes.

[0031] See Figure 14 The figure shows a simulation model of the volume fraction and flow rate of R32 refrigerant in a two-phase state in a single-liquid separator.

[0032] Before entering the evaporator, the refrigerant is generally a gas-liquid two-phase mixture. Uneven liquid distribution can have adverse consequences: microchannels with low liquid distribution experience high superheat, while microchannels with high liquid distribution suffer from liquid carryover at the outlet, significantly wasting the heat exchange capacity of the microchannel heat exchanger. To improve the performance of the microchannel heat exchanger, a suitable liquid distributor must be installed to ensure uniform distribution of the refrigerant within the tubes.

[0033] See Figure 4 In this embodiment, the inlet and outlet connecting pipes of the liquid separator can be designed on the side of the liquid separator or on the front of the liquid separator.

[0034] The internal flow channel design of the distributor head is used to guide and distribute the refrigerant, achieving the following functions: After the refrigerant enters the distributor head through the connecting pipe, it is divided into two or more paths. The internal flow channel structure enhances the mixing degree of the gas-liquid two-phase flow and allows the two-phase refrigerant to flow left and right, so gravity does not affect the refrigerant. At the same time, the structural design of the internal flow channel of the distributor head controls the refrigerant flow rate, promotes the full mixing of the gas and liquid phases, and thus distributes the refrigerant evenly to each connected microchannel flat tube, ensuring the consistency of the refrigerant flow rate in each microchannel flat tube.

[0035] See Figures 15-17 The refrigerant volume distribution ratio after liquid separation by a one-to-two separator at a flow rate of 20 kg / h.

[0036] This figure shows the refrigerant flow rate at 20 kg / h after being divided by the splitter into two parts and entering the inlets of the microchannel flat tubes. At a refrigerant flow rate of 20 kg / h, the refrigerant is divided into two parts by the splitter and enters the microchannel flat tubes (each containing 16 channels). The refrigerant content in the upper microchannel flat tube is 49.4%, and in the lower microchannel flat tube it is 50.6%. This indicates that with this type of splitter structure, the refrigerant is evenly distributed during distribution, and the refrigerant flow rate tends to be consistent.

[0037] Figure 4 The liquid separator 12 is also a one-to-two liquid separator, including a main structure. The main structure has an internal cavity with a partition in the middle of the cavity. The partition divides the cavity into two independent and parallel chambers. Sealing plates are provided on both sides of the main structure to seal the two chambers. One sealing plate has an inlet hole for connecting to an external medium pipe. The side of the partition has two channels, both of which are connected to the inlet hole and to the two chambers respectively. The sealing plate on the other side has a flat tube slot corresponding to the chamber. The flat tube slot is used to insert and connect to a serpentine tube.

[0038] Dispensing heads 11 and 12 can meet different space installation requirements.

[0039] Example 3 Figure 5 A one-to-four insert-plate multi-serpentine tube microchannel heat exchanger is demonstrated. The number of serpentine tube units includes two sets, each set of serpentine tube units including serpentine tubes 27 and 28. The flat tube ports on the outer sides of the two sets of serpentine tube units are connected to one-to-two liquid distributors 14 and 15, respectively, while the flat tube ports on the inner sides of the two sets of serpentine tube units are connected to the same one-to-four liquid distributor 13.

[0040] This one-to-four insert-plate multi-serpentine tube microchannel heat exchanger is an extension of Embodiment 2. The main difference is that the one-to-four liquid distributor 13 can connect two working principles with the insert-plate multi-serpentine tube microchannel heat exchanger proposed in Embodiment 2, thereby expanding the heat exchange area and enhancing the applicability of the insert-plate multi-serpentine tube microchannel heat exchanger. The serpentine tubes 27 and 28 have undergone three round trip bends, and their overall length has also been changed accordingly.

[0041] Example 4 Figure 6An insert-type multi-serpentine tube microchannel heat exchanger is demonstrated. It features a two-sided inlet / outlet structure and includes two flat tubes with internal microchannels. These two flat tubes are simultaneously folded into a three-round-trip serpentine tube unit, forming serpentine tubes 27 and 28. The two ends of serpentine tubes 27 and 28 are respectively connected to manifold assemblies 16, 17, 18, and 19. Insert-type fins 3 are also installed on the flat tubes.

[0042] The flat end 281 of the serpentine tube 28 is inserted into the flat end 162 of the manifold assembly 16, and the flat end 282 of the serpentine tube 28 is inserted into the flat end 192 of the manifold assembly 19. The flat end 271 of the serpentine tube 27 is inserted into the flat end 172 of the manifold assembly 17, and the flat end 272 of the serpentine tube 27 is inserted into the flat end 182 of the manifold assembly 18. Fins 3 are arranged on the outside of the serpentine tubes 27 and 28.

[0043] See Figure 8 This dual-entry, multi-serpentine tube microchannel heat exchanger has two flow paths. One flow path of the liquid heat exchange medium enters the manifold assembly 16 through port 161, then flows into the serpentine tube 28. In the serpentine tube 28, the liquid phase transforms into the gas phase, and the gas phase heat exchange medium flows into the manifold assembly 19 and exits the heat exchanger through port 191. The other flow path of the liquid heat exchange medium enters the manifold assembly 18 through port 181, then flows into the serpentine tube 27. In the serpentine tube 27, the liquid phase transforms into the gas phase, and the gas phase heat exchange medium flows into the manifold assembly 17 and exits the heat exchanger through port 171. Because the flow paths of the liquid and gas phase heat exchange media in the serpentine tubes 27 and 28 are very close, this microchannel heat exchanger can reduce the temperature difference in the air field, thus avoiding condensation in the heat exchanger.

[0044] Of course, in this embodiment, the liquid heat exchange medium can also enter the heat exchanger through port 191 of manifold assembly 19 and exit the heat exchanger through port 161 of manifold assembly 16, enter the heat exchanger through port 171 of manifold assembly 17 and exit the heat exchanger through port 181 of manifold assembly 18. The flow direction of the heat exchange medium can also be reversed.

[0045] In summary, the serpentine tube microchannel heat exchanger proposed in this invention achieves better integrated liquid distribution, effectively reducing the number of flow paths in the microchannel heat exchanger; it can effectively cope with scenarios where there are large wind speed deviations in different areas of the same air field, achieving more balanced evaporation of the heat exchange medium. The serpentine tube microchannel heat exchanger proposed in this invention is designed with inlets and outlets on both sides, which not only effectively addresses the unevenness of the air field but also solves the problem of the overheated zone of the heat exchange medium evaporation in the same area, effectively avoiding condensation problems after the air passes through the microchannel heat exchanger; the design of the insert-type multi-serpentine tube microchannel heat exchanger with inlets and outlets on both sides allows it to be used in systems with two or more compressors. When one compressor in the system needs to be stopped due to usage conditions, the air-side heat exchange area of ​​the insert-type multi-serpentine tube microchannel heat exchanger is maximized.

[0046] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A serpentine tube microchannel heat exchanger, characterized in that: It includes m (m≥2) flat tubes with internal microchannels. The m flat tubes are simultaneously folded into n (n≥1) round trip serpentine tube units. The m flat tubes are connected in parallel between two liquid separators. The liquid separators divide the heat exchange medium into m parts, which flow into the m flat tubes respectively. Insertion fins are installed on the flat tubes.

2. The serpentine tube microchannel heat exchanger according to claim 1, characterized in that: The liquid separator is a one-to-two liquid separator, which includes a main structure with an internal cavity. A partition is provided in the middle of the cavity, which divides the cavity into two independent and parallel chambers. Sealing plates are provided on both sides of the main structure to seal the two chambers. The main structure has a fluid inlet hole on its side wall. The end of the fluid inlet hole is connected to two branch channels. The end of the fluid inlet hole is perpendicular to the two branch channels. The two branch channels are respectively connected to the channels on both sides of the partition. The channels on both sides are respectively connected to their corresponding chambers. The sealing plate has a flat tube slot at the corresponding chamber. The flat tube slot is used to insert and connect to the serpentine tube. Alternatively, one side of the sealing plate has an inlet hole, and the side of the partition plate includes two channels, both of which are connected to the inlet hole and are connected to two chambers respectively. The other side of the sealing plate has a flat tube slot at the corresponding chamber, and the flat tube slot is used to insert and connect to the serpentine tube.

3. The serpentine tube microchannel heat exchanger according to claim 1, characterized in that: The liquid distribution head is a multi-liquid distribution head, comprising an inlet plate, a channel plate, a flow distribution orifice plate, a chamber plate, and a sealing plate connected in sequence. The inlet plate has a fluid inlet, the channel plate has at least two flow distribution channels, the fluid inlet communicates with the flow distribution channels, the flow distribution orifice plate has flow distribution holes, and the end of each flow distribution channel is connected to a flow distribution hole. The chamber plate has several parallel liquid distribution chambers of equal size, and the sealing plate has a flat tube slot, each flat tube slot corresponding to and communicating with a liquid distribution chamber. The flat tube slot is used to insert and communicate with a flat tube.

4. The serpentine tube microchannel heat exchanger according to claim 1, characterized in that: The fins include a sheet-like main board, with multiple slots on one side of the sheet-like main board, into which flat tubes are inserted.

5. The serpentine tube microchannel heat exchanger according to claim 2, characterized in that: The serpentine tube unit contains two flat tubes.

6. The serpentine tube microchannel heat exchanger according to claim 3, characterized in that: The number of serpentine tube units includes two sets. The flat tubes on the outer side of the two sets of serpentine tube units are each connected to a dispensing head, and the flat tubes on the inner side of the two sets of serpentine tube units are connected to the same dispensing head.

7. The serpentine tube microchannel heat exchanger according to claim 6, characterized in that: The serpentine tube unit contains two flat tubes.

8. A serpentine tube microchannel heat exchanger, characterized in that: It includes two flat tubes with internal microchannels, which are simultaneously folded into a serpentine tube unit that travels n (n≥1) times. Each flat tube is connected to a manifold distributor at both ends, and insertable fins are installed on the flat tubes.

9. The serpentine tube microchannel heat exchanger according to claim 8, characterized in that: The fins include a sheet-like main board, with multiple slots on one side of the sheet-like main board, into which flat tubes are inserted.

10. The serpentine tube microchannel heat exchanger according to claim 9, characterized in that: The heat exchange medium is introduced into the two flat tubes through the manifold distributor, and the flow direction of the heat exchange medium is the same or opposite.

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