Phase change reinforced heat exchanger

Abstract

The utility model belongs to the technical field of heat exchangers, and discloses a phase change reinforced heat exchanger. A first enhanced heat exchange structure and a first enhanced heat exchange coating are arranged on the outer wall face of a heat exchange pipe of the heat exchanger, and the first enhanced heat exchange structure protrudes out of the first enhanced heat exchange coating in the radial direction of the heat exchange pipe. A second heat exchange enhancement coating is arranged on the inner wall face of the heat exchange pipe, and a flowing medium is arranged in the heat exchange pipe. The first enhanced heat exchange structure, the first enhanced heat exchange coating and the second enhanced heat exchange coating are arranged, fluid disturbance is increased through the first enhanced heat exchange structure, the heat exchange efficiency of the heat exchanger is improved, meanwhile, the first enhanced heat exchange coating is arranged to form a phase change core, and the heat transfer coefficient can be further improved. Besides, the first enhanced heat exchange structure has a certain protection effect on the first enhanced heat exchange coating, so that the first enhanced heat exchange coating is not prone to being damaged outside the pipe, the second enhanced heat exchange coating is not prone to falling off in the pipe, and long-period efficient operation of the heat exchange pipe and the phase change enhanced heat exchanger can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a phase change enhanced heat exchanger. Background Technology

[0002] In the field of heat exchangers, common heat exchange conditions include those with and without phase change. Phase change heat transfer conditions include liquid evaporation and gas condensation. High-flux heat exchange tubes are heat exchange tubes with a sintered coating on their outer surface to enhance heat transfer performance. This type of tube has a very significant enhancing effect on boiling heat transfer of various media such as water, ethanol, Freon, liquid nitrogen, and olefins, with a heat transfer coefficient that can be 3 to 8 times that of a bare tube. Superhydrophobic coatings are structures with self-cleaning and anti-fouling properties, high-efficiency droplet condensation heat transfer coefficients, and anti-icing and anti-frost properties. They can be processed onto heat exchange tubes through spraying or other methods, significantly increasing the condensation heat transfer coefficient of the heat exchange tubes.

[0003] However, this method of enhancing heat transfer using coatings has drawbacks. The coating is typically applied to the outer wall of the heat exchanger tube, and the adhesion strength between the coating and the base tube can be unstable. During use, the coating may partially detach and fail. Furthermore, because this tube type contains an outer coating, the coating is constantly rubbed during the manufacturing, installation, and operation of the heat exchanger, especially during the tube insertion process, leading to coating damage, reduced heat transfer efficiency, or even failure.

[0004] Therefore, there is an urgent need for a phase change enhanced heat exchanger to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a phase change enhanced heat exchanger that can achieve strong heat exchange and overcome the problem of easy damage to the outer coating of the heat exchange tube.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A phase change enhanced heat exchanger includes at least one heat exchange tube. The outer wall of the heat exchange tube is provided with a first enhanced heat exchange structure and a first enhanced heat exchange coating. The first enhanced heat exchange coating and the first enhanced heat exchange structure enhance the heat exchange effect between the heat exchange tube and the fluid outside the tube. At least a portion of the first enhanced heat exchange structure protrudes from the first enhanced heat exchange coating along the radial direction of the heat exchange tube, so that the first enhanced heat exchange structure can protect the first enhanced heat exchange coating. The inner wall of the heat exchange tube is provided with a second enhanced heat exchange coating, and a flowing medium is disposed inside the heat exchange tube. The second enhanced heat exchange coating enhances the heat exchange effect between the flowing medium and the heat exchange tube.

[0008] Preferably, the inner wall of the heat exchange tube is provided with a second enhanced heat exchange structure, and the second enhanced heat exchange coating is provided on the second enhanced heat exchange structure. The second enhanced heat exchange structure and the second enhanced heat exchange coating are used to increase the heat exchange efficiency between the inner wall of the heat exchange tube and the flowing medium.

[0009] Preferably, the second enhanced heat exchange structure includes at least one of a textured surface structure, a T-groove structure, a corrugated structure, a straight groove structure, and a spiral groove structure.

[0010] Preferably, the first enhanced heat exchange coating is a enhanced condensation coating, and the second enhanced heat exchange coating is a enhanced evaporation coating; or...

[0011] The first enhanced heat exchange coating is an enhanced evaporation coating, and the second enhanced heat exchange coating is an enhanced condensation coating.

[0012] Preferably, the first enhanced heat exchange structure includes a protrusion and a recess. Along the radial direction of the heat exchange tube, the protrusion extends beyond the recess, and the recess is located between two adjacent protrusions.

[0013] The first heat-strengthening coating is disposed on the surface of the recess; or, the first heat-strengthening coating is disposed on the surfaces of the recess and the protrusion.

[0014] Preferably, the outer wall surface of the heat exchange tube is provided with at least one of the following: a textured surface, a T-groove structure, a corrugated structure, a straight groove structure, and a spiral groove structure, to form the recessed portion and the protruding portion.

[0015] Preferably, the phase change enhanced heat exchanger further includes a baffle assembly, which forms a flow gap for the shell-side fluid to pass through. The flow gap is used to reduce pressure drop, and the baffle assembly can abut against the first enhanced heat exchange structure to fix the heat exchange tube in place.

[0016] Preferably, at least two baffle assemblies are spaced apart along the extension direction of the heat exchange tube. Each baffle assembly includes a baffle ring and multiple baffle rods. The multiple baffle rods are arranged parallel to each other within the baffle ring. A flow gap is formed between two adjacent baffle rods connected to one of the baffle rings. The baffle rods of two adjacent baffle assemblies are arranged at an angle, and the diameter of the baffle rod is smaller than the diameter of the heat exchange tube.

[0017] The beneficial effects of this invention are as follows: A first enhanced heat transfer structure and a first enhanced heat transfer coating are provided on the outer wall of the heat exchange tube, and a second enhanced heat transfer coating is provided on the inner wall of the heat exchange tube. The first enhanced heat transfer structure increases fluid turbulence and improves the heat transfer efficiency of the heat exchanger. Simultaneously, the first enhanced heat transfer coating forms a phase change nucleus, which, in conjunction with the second enhanced heat transfer coating, further improves the heat transfer coefficient. Furthermore, the first enhanced heat transfer structure provides some protection for the first enhanced heat transfer coating, making it less susceptible to damage on the outside of the tube, and the second enhanced heat transfer coating less likely to detach inside the tube, thus ensuring long-term, efficient operation of the heat exchange tube and the phase change enhanced heat exchanger. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the phase change enhanced heat exchanger provided by this utility model;

[0019] Figure 2 This is a perspective view of the first type of heat exchange tube provided by this utility model;

[0020] Figure 3 This is a cross-sectional schematic diagram of the first type of heat exchange tube provided by this utility model;

[0021] Figure 4 This is a perspective view of the second type of heat exchange tube provided by this utility model;

[0022] Figure 5 This is a cross-sectional schematic diagram of the second type of heat exchange tube provided by this utility model;

[0023] Figure 6 This is a perspective view of the third type of heat exchange tube provided by this utility model;

[0024] Figure 7 This is a cross-sectional schematic diagram of the third type of heat exchange tube provided by this utility model;

[0025] Figure 8 This is a perspective view of the fourth type of heat exchange tube provided by this utility model;

[0026] Figure 9 This is a cross-sectional schematic diagram of the fourth type of heat exchange tube provided by this utility model;

[0027] Figure 10 It is a three-dimensional assembly drawing of the baffle assembly and heat exchange tubes;

[0028] Figure 11 It is a side view assembly drawing of the baffle assembly and heat exchange tubes.

[0029] In the picture:

[0030] 1. Fluid inlet in the tube;

[0031] 2. Front tube box;

[0032] 3. Shell-side fluid outlet;

[0033] 4. Baffle assembly; 41. Baffle ring; 42. Baffle rod;

[0034] 5. Heat exchange tube; 51. Second enhanced heat exchange coating; 52. First enhanced heat exchange coating; 53. First enhanced heat exchange structure; 54. Second enhanced heat exchange structure;

[0035] 6. Shell;

[0036] 7. Rear tube box;

[0037] 8. Fluid outlet in the tube;

[0038] 9. Shell-side fluid inlet. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," and "abutting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature 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 includes the first feature 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.

[0042] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0043] The following is based on the appendix Figure 1 To be continued Figure 11 This invention introduces a phase change enhanced heat exchanger. Specifically, the phase change enhanced heat exchanger includes a tube-side fluid inlet 1, a front tube box 2, a shell-side fluid outlet 3, a baffle assembly 4, heat exchange tubes 5, a shell 6, a rear tube box 7, a tube-side fluid outlet 8, and a shell-side fluid inlet 9. Figure 1 As shown, the front tube box 2 and the rear tube box 7 are connected to both ends of the shell 6. The front tube box 2 is provided with a tube-side fluid inlet 1, and the rear tube box 7 is provided with a tube-side fluid outlet 8. The shell 6 is provided with a shell-side fluid outlet 3 and a shell-side fluid inlet 9. Multiple heat exchange tubes 5 are installed inside the shell 6 through tube sheets and baffle assemblies 4 at both ends. The flowing medium flows into the heat exchange tubes 5 through the tube-side fluid inlet 1 and then flows out from the tube-side fluid outlet 8. Heat exchange occurs between the heat exchange tubes 5 and the shell-side fluid located outside the heat exchange tubes 5, thereby realizing the heat exchange function.

[0044] More specifically, refer to Figure 2 , Figure 3 As shown, the outer wall of the heat exchange tube 5 is provided with a first enhanced heat exchange structure 53 and a first enhanced heat exchange coating 52, which are used to enhance the heat exchange effect between the heat exchange tube 5 and the fluid outside the tube. Furthermore, at least a portion of the first enhanced heat exchange structure 53 protrudes from the first enhanced heat exchange coating 52 along the radial direction of the heat exchange tube 5, so that the first enhanced heat exchange structure 53 can protect the first enhanced heat exchange coating 52. The inner wall of the heat exchange tube 5 is provided with a second enhanced heat exchange coating 51, and the aforementioned flowing medium can flow inside the heat exchange tube 5. The second enhanced heat exchange coating 51 is used to enhance the heat exchange effect between the flowing medium and the heat exchange tube 5.

[0045] A first enhanced heat transfer structure 53 and a first enhanced heat transfer coating 52 are provided on the outer wall of the heat exchange tube 5, and a second enhanced heat transfer coating 51 is provided on the inner wall of the heat exchange tube 5. The first enhanced heat transfer structure 53 increases fluid turbulence and improves the heat transfer efficiency of the heat exchanger. At the same time, the first enhanced heat transfer coating 52 forms a phase change nucleus, which, together with the second enhanced heat transfer coating 51, can further improve the heat transfer coefficient. In addition, the first enhanced heat transfer structure 53 provides a certain degree of protection for the first enhanced heat transfer coating 52, making the first enhanced heat transfer coating 52 less susceptible to damage on the outside of the tube, and the second enhanced heat transfer coating 51 less likely to fall off inside the tube, thus ensuring the long-term efficient operation of the heat exchange tube 5 and the phase change enhanced heat exchanger.

[0046] like Figure 2 , Figure 3 As shown, specifically, the first enhanced heat exchange structure 53 includes protrusions. At least two protrusions extend from the outer wall of the heat exchange tube 5 along its radial direction, and a recess is formed between adjacent protrusions. The first enhanced heat exchange coating 52 is disposed on the surface of the recess. During tube insertion, the protrusions rub against the baffle assembly 4, thus preventing friction between the recess and the baffle assembly 4, thereby protecting the first enhanced heat exchange coating 52 disposed in the recess. Of course, to simplify the manufacturing process and reduce costs, the first enhanced heat exchange coating 52 can also be directly disposed on the surfaces of the recess and protrusions. As long as the first enhanced heat exchange coating 52 disposed in the recess is protected by the protrusions, it falls within the scope of protection of this utility model.

[0047] Preferably, the inner wall of the heat exchange tube 5 is provided with a second enhanced heat exchange structure 54. The second enhanced heat exchange structure 54 is used to increase the heat exchange efficiency between the inner wall of the heat exchange tube 5 and the flowing medium, thereby improving the overall heat exchange effect. When the heat exchange tube 5 is simultaneously provided with a first enhanced heat exchange structure 53, a first enhanced heat exchange coating 52, a second enhanced heat exchange structure 54, and a second enhanced heat exchange coating 51, it can achieve the dual effects of enhanced disturbance and formation of vaporization nuclei when a temperature difference occurs inside and outside the tube, thereby multiplying the heat transfer efficiency between the inside and outside of the tube.

[0048] Optionally, the second enhanced heat exchange structure 54 includes at least one of the following: a textured surface structure, a T-groove structure, a corrugated structure, a straight groove structure, and a spiral groove structure. These structures can all enhance the contact area between the flowing medium and the heat exchange tube 5, thereby greatly improving the heat exchange efficiency between the heat exchange tube 5 and the flowing medium.

[0049] More preferably, the outer wall surface of the heat exchange tube 5 is provided with at least one of the following structures: a rough surface, a T-groove structure, a corrugated structure, a straight groove structure, and a spiral groove structure, to form the aforementioned recesses and protrusions. This not only provides wear resistance and protection for the first reinforced heat exchange coating 52, but also allows for a larger contact area between the heat exchange tube 5 and the fluid outside the tube, thereby further enhancing the heat exchange efficiency of the heat exchange tube 5.

[0050] Specifically, such as Figure 2 , Figure 3 As shown, in the first embodiment provided by this utility model, the base tube is first processed to a length and thickness with allowance, and then the base tube is extruded or machined to form a heat exchange tube 5 with a corrugated outer wall structure. Then, according to the specific heat exchange type of the heat exchange tube 5, the specific types of the second enhanced heat exchange coating 51 and the first enhanced heat exchange coating 52 are determined. For example, in this embodiment, the flowing medium needs to be evaporated inside the tube, while condensation needs to be performed outside the tube. Therefore, the second enhanced heat exchange coating 51 is an enhanced evaporation coating, while the first enhanced heat exchange coating 52 is an enhanced condensation coating.

[0051] In the fabrication process, the metal powder and inorganic materials required for the enhanced evaporation coating are first mixed to form the desired coating precursor, which is then sprayed onto the inner wall of the heat exchange tube 5. After drying, it is sintered at high temperature to form an enhanced evaporation coating with high throughput characteristics, thereby enhancing evaporation. Next, an enhanced condensation coating is sprayed onto the outer wall of the heat exchange tube 5. A coating precursor is first prepared using materials such as silica, and then sprayed onto the outer wall of the heat exchange tube 5. Finally, an enhanced condensation coating with superhydrophobic properties is formed, enhancing the condensation heat transfer effect.

[0052] Of course, other methods or structures can also be used to achieve a similar effect. For example, such as Figure 4 , Figure 5 As shown, in the second embodiment provided by this utility model, a larger processing allowance is left in the thickness of the base tube, allowing for the processing of straight groove or spiral groove structures on the outer wall surface, and a rough surface, straight groove, or spiral groove structure on the inner wall surface. Then, a protective layer is first wrapped around the heat exchange tube 5, followed by spraying, drying, and sintering of a metal powder coating inside the heat exchange tube 5 to form a reinforced evaporation coating. This combination of the second reinforced heat exchange structure 54 and the second reinforced heat exchange coating 51 enhances the turbulence of the flowing medium within the heat exchange tube 5, while also increasing the number of vaporization nuclei during evaporation and boiling, significantly enhancing the boiling and evaporation efficiency within the heat exchange tube 5. Finally, similarly, a reinforced condensation coating is sprayed onto the outer wall surface to strengthen the condensation effect on the outer wall of the heat exchange tube 5.

[0053] like Figure 6 , Figure 7As shown, in the third embodiment provided by this utility model, the flowing medium needs to be condensed inside the pipe, while evaporation is required outside the pipe. Therefore, the second enhanced heat exchange coating 51 is a condensation-enhancing coating, while the first enhanced heat exchange coating 52 is an evaporation-enhancing coating.

[0054] During fabrication, for example, the base tube is first wrapped and protected with materials such as polytetrafluoroethylene (PTFE), and then an inorganic substance such as silica, along with a coupling agent and a binder, is used to prepare a reinforced condensation coating liquid. Afterward, the base tube can be placed in a container filled with the reinforced condensation coating for immersion coating. After immersion coating for a period of time, the reinforced condensation coating can more stably adhere to and form on the inner wall of the heat exchange tube 5, forming a dense reinforced condensation coating. Of course, other methods such as spraying can also be used to process the reinforced condensation coating inside the tube; this invention does not specifically limit this method.

[0055] Then, the outer wall surface of the heat exchange tube 5 is machined to form the aforementioned first enhanced heat exchange structure 53. Finally, the outer wall surface of the heat exchange tube 5 is sprayed to form an enhanced evaporation coating. Preferably, the first enhanced heat exchange structure 53 adopts a T-groove structure, that is, a correspondingly shaped recess is cut into the outer wall surface of the heat exchange tube 5, and a protrusion is formed between two adjacent recesses. This protrusion serves as the aforementioned first enhanced heat exchange structure 53. The enhanced evaporation coating is disposed in the recesses, or on the surface of the recesses and the protrusion, so that the enhanced evaporation coating located at least in the recesses is protected by the protrusion. The T-groove structure is beneficial for increasing the vaporization nuclei during boiling of the flowing medium, thereby greatly improving the evaporation-boiling heat transfer coefficient of the flowing medium outside the tube.

[0056] Of course, other methods or structures can also be used to achieve a similar effect. For example, such as Figure 8 , Figure 9 As shown, in the fourth embodiment of this utility model, a larger processing allowance is left in the thickness of the base tube. First, the inside and outside of the base tube are extruded or cut to form the aforementioned T-groove structure on the outside, combined with a reinforced evaporation coating. The inside of the tube is processed to form a corrugated structure or a spiral groove structure. Then, a protective layer of polytetrafluoroethylene or other materials is wrapped around the outer wall of the tube. The processed heat exchange tube 5 is then immersed in a container containing the reinforced condensation coating for dipping. After dipping, the reinforced condensation coating is formed inside the tube, thereby enhancing the condensation heat transfer coefficient. Thus, even if a second reinforced heat transfer structure 54, different from a plain tube, is processed inside the tube, the coating can still better adhere to the inner wall of the tube. The reinforced condensation coating combined with the second reinforced heat transfer structure 54 inside the tube can enhance the turbulence of the flowing medium and, at the same time, utilize the coating characteristics to allow the condensed liquid to quickly detach from the inner wall of the tube, greatly enhancing the condensation efficiency inside the tube. Combined with the aforementioned structure on the outside that enhances evaporation boiling efficiency and the first reinforced heat transfer coating 52, the heat transfer efficiency is significantly improved.

[0057] It should be noted that the second enhanced heat exchange structure 54 and the first enhanced heat exchange structure 53 can both adopt at least one of the following structures: textured surface, T-groove, corrugated, straight groove, and spiral groove. These structures can all form recesses and protrusions, and when installed outside the tube, they can protect the first enhanced heat exchange coating 52. Therefore, they all fall within the scope of protection of this utility model.

[0058] Furthermore, it should be emphasized that when setting the first enhanced heat exchange structure 53, it can be done by simply adding protrusions (e.g., by extrusion processing) to form a recess between two adjacent protrusions, or by simply setting recesses (e.g., by cutting processing) to form a protrusion between two adjacent recesses, or by simultaneously setting both protrusions and recesses. All these configuration methods can form a first enhanced heat exchange structure 53 with a protective effect, and all fall within the scope of protection of this utility model. Optionally, the heat exchange tube 5 is a double-sided phase change enhanced heat exchange tube, which can be manufactured from various materials such as carbon steel, stainless steel, titanium, zirconium, nickel-based alloys, or copper alloys. Depending on the specific material, any of the above configuration methods can be selected to form a suitable first enhanced heat exchange structure 53.

[0059] Furthermore, in this embodiment, the baffle assembly 4 includes at least one of a grid, a support plate, and a baffle rod 42. Specifically, the baffle assembly 4 forms a flow gap for the shell-side fluid to pass through. The flow gap is used to reduce the pressure drop, thereby offsetting the increased pressure drop caused by the special external structure and helping to improve the local heat transfer coefficient. At the same time, the baffle assembly 4 can abut against the first enhanced heat transfer structure 53 to fix the heat exchange tube 5 in place.

[0060] For example, referring to Figure 10 , Figure 11As shown, at least two baffle assemblies 4 are spaced apart along the extension direction of the heat exchange tube 5. Each baffle assembly 4 includes a baffle ring 41 and multiple baffle rods 42, which are arranged parallel to each other within the baffle ring 41. A flow gap is formed between two adjacent baffle rods 42 connected to a baffle ring 41, allowing the shell-side fluid to flow through the flow gap and pass through a baffle assembly 4. The baffle rods 42 of two adjacent baffle assemblies 4 are arranged at an angle, for example, perpendicularly, so that the multiple baffle rods 42 form a multi-layered staggered structure. The positions of the baffle rods 42 located in different layers can be different, and the staggered relationship of the baffle rods 42 between different layers is used to fix the heat exchange tube 5. This structure can reduce the wear on the outer surface of the heat exchange tube 5 during tube insertion, shorten the tube insertion time, and reduce manufacturing costs. It should be noted that the T-groove structure, spiral groove structure, and other first enhanced heat exchange structures 53 processed on the outside of the tube increase the friction of the fluid outside the tube (in this embodiment, the shell-side fluid) to a certain extent, which will increase the pressure drop of the fluid outside the tube. However, the use of baffle rods 42, grids, etc., can facilitate the passage of the fluid outside the tube, reduce the pressure drop, and minimize the negative effects caused by the change in the shape of the heat exchange tube 5. Optionally, the diameter of the baffle rod 42 is smaller than that of the heat exchange tube 5, thereby further reducing the pressure drop and reducing the flow resistance of the fluid outside the tube.

[0061] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A phase change enhanced heat exchanger, characterized in that, It includes at least one heat exchange tube (5), and the outer wall surface of the heat exchange tube (5) is provided with a first enhanced heat exchange structure (53) and a first enhanced heat exchange coating (52). The first enhanced heat exchange coating (52) and the first enhanced heat exchange structure (53) are used to enhance the heat exchange effect between the heat exchange tube (5) and the fluid outside the tube, and at least part of the first enhanced heat exchange structure (53) protrudes from the first enhanced heat exchange coating (52) along the radial direction of the heat exchange tube (5) so that the first enhanced heat exchange structure (53) can protect the first enhanced heat exchange coating (52). The inner wall of the heat exchange tube (5) is provided with a second heat exchange coating (51), and a flowing medium is provided inside the heat exchange tube (5). The second heat exchange coating (51) is used to enhance the heat exchange effect between the flowing medium and the heat exchange tube (5).

2. The phase change enhanced heat exchanger according to claim 1, characterized in that, The inner wall of the heat exchange tube (5) is provided with a second enhanced heat exchange structure (54), and a second enhanced heat exchange coating (51) is provided on the second enhanced heat exchange structure (54). The second enhanced heat exchange structure (54) and the second enhanced heat exchange coating (51) are used to increase the heat exchange efficiency between the inner wall of the heat exchange tube (5) and the flowing medium.

3. The phase change enhanced heat exchanger according to claim 2, characterized in that, The second enhanced heat exchange structure (54) includes at least one of the following: textured structure, T-groove structure, corrugated structure, straight groove structure and spiral groove structure.

4. The phase change enhanced heat exchanger according to claim 3, characterized in that, The first enhanced heat exchange coating (52) is an enhanced condensation coating, and the second enhanced heat exchange coating (51) is an enhanced evaporation coating; or, The first enhanced heat exchange coating (52) is an enhanced evaporation coating, and the second enhanced heat exchange coating (51) is an enhanced condensation coating.

5. The phase change enhanced heat exchanger according to claim 1, characterized in that, The first enhanced heat exchange structure (53) includes a protrusion and a recess. Along the radial direction of the heat exchange tube (5), the protrusion protrudes beyond the recess, and the recess is provided between two adjacent protrusions. The first heat-strengthening coating (52) is disposed on the surface of the recess; or, the first heat-strengthening coating (52) is disposed on the surfaces of the recess and the protrusion.

6. The phase change enhanced heat exchanger according to claim 5, characterized in that, The outer wall surface of the heat exchange tube (5) is provided with at least one of the following: a textured surface, a T-groove structure, a corrugated structure, a straight groove structure, and a spiral groove structure, to form the recessed portion and the protruding portion.

7. The phase change enhanced heat exchanger according to claim 6, characterized in that, The phase change enhanced heat exchanger further includes a baffle assembly (4), which forms a flow gap for the shell-side fluid to flow through. The flow gap is used to reduce the pressure drop, and the baffle assembly (4) can abut against the first enhanced heat exchange structure (53) to fix the heat exchange tube (5).

8. The phase change enhanced heat exchanger according to claim 7, characterized in that, Along the extension direction of the heat exchange tube (5), at least two baffle components (4) are spaced apart. Each baffle component (4) includes a baffle ring (41) and a plurality of baffle rods (42). The plurality of baffle rods (42) are arranged in parallel spaced apart within the baffle ring (41). A flow gap is formed between two adjacent baffle rods (42) connected to a baffle ring (41). The baffle rods (42) of two adjacent baffle components (4) are arranged at an angle, and the diameter of the baffle rods (42) is smaller than the diameter of the heat exchange tube (5).

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