An energy-saving heat exchanger based on rhombohedral octahedron metamaterial

Abstract

The present invention discloses an energy-saving heat exchanger based on rhombohedral octahedron metamaterial, which relates to the technical field of heat exchange equipment, including heat exchange plates, heat exchange fins and connecting pipes, wherein the connecting pipes are connected to the heat exchange plates, and adjacent heat exchange plates are connected to the heat exchange fins, and the heat exchange fins are composed of a number of rhombohedral octahedral metamaterial cells periodically arranged in space, wherein the rhombohedral octahedral metamaterial cell is composed of 18 square faces and 8 regular triangle faces in space; the rhombohedral octahedral metamaterial cell has a total of 26 faces, 48 ​​edges and 24 vertices. The present invention adopts the above-mentioned energy-saving heat exchanger based on rhombohedral octahedron metamaterial, which has the characteristics of light weight and high heat exchange efficiency compared with traditional heat exchangers, reduces heat dissipation energy consumption, and is energy-saving and environmentally friendly; the heat exchange fins use rhombohedral octahedral metamaterials, which helps to improve the operating efficiency of the heat exchanger, so that the heat exchanger can effectively deal with the situation where a large amount of heat generated by the equipment during operation cannot be dissipated.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange equipment, and in particular to an energy-saving heat exchanger based on rhombohedral octahedron metamaterial. Background Art

[0002] Metamaterials are artificial composite structures or materials with extraordinary physical properties that natural materials do not have. In the field of thermal science, the research on metamaterials has brought unprecedented opportunities for new thermal management and heat exchange technologies. Traditional materials are limited by their inherent properties in terms of thermal conductivity, heat dissipation and other thermal properties. Metamaterials break through these limitations and regulate the propagation path and mode of heat flow through carefully designed microscopic or mesoscopic structures. The research on metamaterials in thermal management has shown great potential in many fields. The heat dissipation structure based on metamaterials helps to improve energy conversion efficiency and reduce energy loss and shortened equipment life caused by overheating.

[0003] A heat exchanger is a device used to exchange heat between two media and is widely used in energy, chemical industry, biomedicine, environmental protection and other fields. However, existing heat exchangers often need to consume more energy to maintain sufficient heat exchange efficiency or fail to meet heat exchange requirements when facing high load and high efficiency requirements. Therefore, there is an urgent need for a new type of heat exchanger that can significantly improve heat exchange efficiency without increasing too much cost and complexity to meet the needs of the ever-evolving modern industry and energy applications. Summary of the invention

[0004] The purpose of the present invention is to provide an energy-saving heat exchanger based on rhombohedral octahedron metamaterial to solve the problems of insufficient heat exchange efficiency and low energy utilization rate of existing heat exchangers, so as to meet the demand for efficient and energy-saving heat exchange during the operation of large-scale industrial equipment.

[0005] To achieve the above-mentioned purpose, the present invention provides an energy-saving heat exchanger based on rhombohedral octahedral metamaterial, comprising a heat exchange plate, a heat exchange fin and a connecting pipe, wherein the connecting pipe is connected to the heat exchange plate, and adjacent heat exchange plates are connected to the heat exchange fins, and the heat exchange fins are composed of a plurality of rhombohedral octahedral metamaterial cells periodically arranged in space, and the rhombohedral octahedral metamaterial cell is composed of 18 square faces and 8 regular triangle faces in space; the rhombohedral octahedral metamaterial cell has a total of 26 faces, 48 ​​edges and 24 vertices.

[0006] Preferably, a flow channel for the flow of coolant is opened in the heat exchange plate, and the flow channel is forked into 7 branch channels in the heat exchange plate, and the branch channels are evenly distributed laterally in the heat exchange plate.

[0007] Preferably, four heat exchange fins are provided, and the upper ends of the heat exchange fins abut against the lower ends of the flow channels above them, and the lower ends of the heat exchange fins abut against the upper ends of the flow channels below them.

[0008] Preferably, the connecting pipe is in a U-shaped structure, the head end of the connecting pipe is threadedly connected to the end of the flow channel above it, and the end of the connecting pipe is threadedly connected to the head end of the flow channel below it.

[0009] Preferably, the head end of the top heat exchange plate and the tail end of the bottom heat exchange plate are both provided with sealing ports, and the sealing ports are screwed to the flow channel; the heat exchanger body is installed in the coolant circuit through the sealing ports.

[0010] Preferably, sealing gaskets are installed at the head end and the tail end of the flow channel and are engraved with threads.

[0011] Preferably, the heat exchange plate and the heat exchange fins are integrally processed by a 3D printing method.

[0012] Therefore, the present invention adopts the above-mentioned energy-saving heat exchanger based on rhombohedral octahedron metamaterial, which has the following beneficial effects:

[0013] (1) The energy-saving heat exchanger based on rhombohedral octahedron metamaterial provided by the present invention has the characteristics of light weight and high heat exchange efficiency compared with traditional heat exchangers, reduces heat dissipation energy consumption, and is energy-saving and environmentally friendly.

[0014] (2) The present invention adopts 3D printing technology, making it possible to manufacture complex heat dissipation structures. At the same time, the 3D printing integrated processing method makes the heat exchanger provided by the present invention have better sealing performance than similar products, effectively reducing the possibility of leakage and other phenomena.

[0015] (3) The heat exchange fins of the present invention use rhombohedral octahedral metamaterials, which have a larger porosity and can provide a larger heat exchange area, thereby helping to improve the operating efficiency of the heat exchanger and enabling the heat exchanger to effectively cope with the situation where a large amount of heat is generated during operation and cannot be dissipated.

[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of an energy-saving heat exchanger based on rhombohedral octahedron metamaterial according to the present invention;

[0018] Figure 2 This is a schematic diagram of the heat exchange plate structure of the present invention;

[0019] Figure 3 is a cross-sectional view of the heat exchange plate of the present invention;

[0020] Figure 4 Schematic diagram and geometric parameters of the rhombohedral octahedron metamaterial cell of the present invention;

[0021] Figure 5 A schematic diagram of the coolant flow direction of the energy-saving heat exchanger of the present invention;

[0022] Figure 6 A schematic diagram of the hot air flow of the energy-saving heat exchanger of the present invention;

[0023] Figure 7 The outlet temperature simulation result of the energy-saving heat exchanger of the present invention;

[0024] Figure 8 It is a temperature cloud diagram of the cooling effect of the energy-saving heat exchanger of the present invention;

[0025] Fig. 9 This is a schematic diagram of the working state of the energy-saving heat exchanger of the present invention;

[0026] Reference numerals

[0027] 1. Shell; 2. Heat exchange plate; 3. Heat exchange fins; 4. Connecting pipe; 5. Sealing port. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0029] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0030] Example

[0031] See also Figure 1-9The present invention provides an energy-saving heat exchanger based on rhombohedral octahedron metamaterial, including a heat exchanger body and a shell 1. The shell 1 is arranged outside the heat exchanger body. The shell 1 is the external frame structure of the heat exchanger, providing accommodation space and protection for other components. The shell 1 enables the entire heat exchanger to perform heat exchange in a relatively closed and stable environment. The heat exchanger body is provided with a heat exchange plate 2, a heat exchange fin 3 and a connecting pipe 4. The shell 1, the heat exchange plate 2 and the heat exchange fin 3 are integrated by 3D printing.

[0032] There are five heat exchange plates 2, which are evenly distributed on the heat exchange body from top to bottom. In each heat exchange plate 2, a flow channel for the flow of coolant is opened. In the middle of the heat exchange plate 2, the flow channel is bifurcated, specifically into 7 branch channels, which are evenly distributed laterally in the heat exchange plate 2. The design of this bifurcated structure is intended to disperse the flow path of the fluid in the heat exchange plate, thereby increasing the contact area between the fluid and the heat exchange plate 2 and enhancing the heat exchange efficiency. The sealing port 5 is installed at the head end of the top heat exchange plate 2 and the end of the bottom heat exchange plate 2, and is screwed to the flow channel. The heat exchanger is installed in the coolant circuit through the sealing port 5.

[0033] Sealing gaskets are installed at the head and end of the flow channel to ensure that there is no leakage when the fluid flows in the flow channel. The head and end of the flow channel are engraved with threads. The two adjacent heat exchange plates 2 are connected by a connecting pipe 4. The shape of the connecting pipe 4 is "U" shaped. The head end of the connecting pipe 4 is screwed to the end of the first flow channel above it, and the end is screwed to the head end of the first flow channel below it.

[0034] The heat exchange fins 3 are distributed between every two heat exchange plates 2. Four heat exchange fins 3 are provided. The heat exchange fins 3 are distributed in the area surrounded by the shell 1, the lower surface of the upper heat exchange plate 2, and the upper surface of the lower heat exchange plate 2. The upper end of the heat exchange fin 3 abuts against the lower end of the heat exchange plate 2 above it, and the lower end abuts against the upper end of the heat exchange plate 2 below it. Through this close contact relationship, heat can be transferred from the heat exchange fin 3 to the flow channel in a more efficient manner.

[0035] When the heat exchanger is in operation, the coolant flows into the heat exchanger from the head end of the upper heat exchange plate 2 driven by an external water pump, flows through the "S"-shaped flow channel system composed of the heat exchange plate 2 and the connecting pipe 4, and flows out from the end of the bottom heat exchange plate 2. Such a flow channel system distribution makes full use of the internal space of the heat exchanger, and the contact area between the flow channel system and the heat exchange fins 3 is increased. Similarly, when the heat exchanger is in operation, the hot air near the heat-generating equipment is guided to one side of the heat exchange fins 3, so that the hot air fully contacts the heat exchange fins 3 when flowing through them, and the heat is transferred from the heat exchange fins 3 to the flow channel of the heat exchange plate 2.

[0036] The heat exchange fin 3 is composed of a number of rhombic octahedron metamaterial cells arranged periodically in space, and the rhombic octahedron metamaterial cells have unique geometric structures and physical properties. Due to its unique geometric shape, the rhombic octahedron can provide a larger surface area. The larger surface area can increase the heat exchange area with the surrounding environment, thereby improving the heat dissipation efficiency. At the same time, the rhombic octahedron structure can fully disturb the gas, destroy the air surface boundary layer, and induce the mixing of cold and hot air to enhance the heat exchange effect. In addition, the rhombic octahedron structure can optimize the heat conduction path so that the heat can be more evenly distributed on the heat sink. The above unique properties make the energy-saving heat exchanger of the present invention have higher heat exchange efficiency than similar products. Preferably, the head end of the top heat exchange plate and the end of the bottom heat exchange plate are both provided with sealing ports, which are screwed to the flow channel. The heat exchanger body is installed in the coolant circuit through the sealing port.

[0037] The number of rhombohedral octahedral metamaterial cells in the x, y and z directions is a, b and c respectively. The values ​​of a, b and c are determined based on the specific application scenario of the heat exchanger, such as the size of the heat exchanger, the heat exchange power requirement, the operating temperature range and other factors; in this embodiment, the values ​​of a, b and c are 8, 2 and 3. Figure 3 The morphology and geometric parameters of the rhombohedron are shown. The rhombohedron is a 26-sided Archimedean solid composed of 18 square faces and 8 regular triangle faces in space. The rhombohedron has 26 faces, 48 ​​edges and 24 vertices. The length, width and height of the rhombohedron are equal, all d.

[0038] In order to test the performance of the heat exchanger proposed in the present invention, the commercial CFD software Fluent was used to simulate the cooling effect of the heat exchanger. In order to improve the accuracy of the simulation results, the sandwich structure of "single-layer rhombic octahedron heat exchange fin-heat exchange channel-double-layer rhombic octahedron heat exchange fin-heat exchange channel-single-layer rhombic octahedron heat exchange fin" was selected for calculation. After geometric modeling, the mesh is generated using Fluent's built-in meshing tool. The boundary conditions of the model are set according to the actual working conditions, including inlet, outlet and wall conditions, such as velocity, pressure, temperature, etc. The surface temperature of the heat exchange channel is set to 25°C, and the initial temperature of the hot air is set to 43°C. After that, run the solver for calculation, and Fluent will iteratively solve the fluid dynamics equations according to the preset parameters until the convergence criteria are reached.

[0039] Figure 6 The simulation results of the outlet temperature of the energy-saving heat exchanger of the present invention are shown. It can be seen that after 25 iterations, the outlet temperature of the heat exchanger stabilizes at 33.5°C, which is 9.5°C lower than the initial temperature. That is, the temperature reduction of hot air flowing through the heat exchanger is 22.09%.

[0040] Figure 7 The temperature cloud diagram of the cooling effect of the energy-saving heat exchanger of the present invention is shown. It can be seen that due to the use of the rhombic octahedron structure, the hot air has obvious diversion after contacting the heat exchange fins 3, which significantly increases the contact area between the hot air and the heat exchange fins 3. After passing through the first layer of rhombic octahedron fins, the hot air is cooled to about 40°C; after passing through the second layer of rhombic octahedron fins, the hot air is cooled to about 36°C; after completely passing through three layers of rhombic octahedron fins, the hot air is cooled to about 33.5°C. The simulation results show that the energy-saving heat exchanger based on the rhombic octahedron metamaterial of the present invention has excellent heat exchange efficiency, and the heat exchange efficiency can be improved by increasing the number of heat exchange fin layers.

[0041] When working, the heat exchanger should be connected to the coolant container through the head and tail seals 5 in the same coolant loop. A water pump should be installed in the loop to drive the coolant to circulate. A thermometer should be installed near the head and tail seals 5 to monitor the coolant temperature in real time. A flow meter should be installed near the head and tail seals 5 to monitor whether there is leakage or accumulation in the heat exchanger in real time so as to deal with it in time. The hot air around the heating equipment is guided to the heat exchange fin 3 area of ​​the heat exchanger through the exhaust system composed of the cooling fan and the air duct so as to exchange heat with the coolant through the fins.

[0042] Therefore, the present invention adopts the above-mentioned energy-saving heat exchanger based on rhombohedral octahedral metamaterial, which has the characteristics of light weight and high heat exchange efficiency compared with traditional heat exchangers, reduces heat dissipation energy consumption, and is energy-saving and environmentally friendly. The present invention adopts 3D printing technology, which makes it possible to manufacture complex heat dissipation structures. At the same time, the 3D printing integrated processing method makes the heat exchanger provided by the present invention have better sealing than similar products, effectively reducing the possibility of leakage and other phenomena. The heat exchange fins of the present invention use rhombohedral octahedral metamaterials. This metamaterial has a large porosity and can provide a larger heat exchange area, which helps to improve the operating efficiency of the heat exchanger, so that the heat exchanger can effectively deal with the situation where a large amount of heat generated by the equipment during operation cannot be dissipated.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An energy-saving heat exchanger based on rhombohedral octahedron metamaterial, characterized by: It includes a heat exchange plate, a heat exchange fin and a connecting pipe, wherein the connecting pipe is connected to the heat exchange plate, and adjacent heat exchange plates are connected to the heat exchange fins, and the heat exchange fins are composed of a plurality of rhombohedral octahedral metamaterial cells periodically arranged in space, and the rhombohedral octahedral metamaterial cell is composed of 18 square faces and 8 regular triangle faces in space; the rhombohedral octahedral metamaterial cell has a total of 26 faces, 48 ​​edges and 24 vertices; The heat exchange plate is provided with a flow channel for the flow of coolant, the flow channel is bifurcated into 7 branch flow channels in the heat exchange plate, and the branch flow channels are evenly distributed laterally in the heat exchange plate; The heat exchange fins are provided in four pieces, and the upper ends of the heat exchange fins abut against the lower ends of the flow channels above them, and the lower ends of the heat exchange fins abut against the upper ends of the flow channels below them.

2. The energy-saving heat exchanger based on rhombohedral octahedron metamaterial according to claim 1, characterized in that: The connecting pipe is in a U-shaped structure, the head end of the connecting pipe is screwed to the end of the flow channel above it, and the end of the connecting pipe is screwed to the head end of the flow channel below it.

3. The energy-saving heat exchanger based on rhombohedral octahedron metamaterial according to claim 2, characterized in that: The head end of the heat exchange plate at the top and the tail end of the heat exchange plate at the bottom are both provided with sealing ports, and the sealing ports are screwed to the flow channel; the heat exchanger body is installed in the coolant circuit through the sealing ports.

4. The energy-saving heat exchanger based on rhombohedral octahedron metamaterial according to claim 3, characterized in that: The flow channel head end and the tail end are equipped with sealing gaskets and are engraved with threads.

5. The energy-saving heat exchanger based on rhombohedral octahedron metamaterial according to claim 4, characterized in that: The heat exchange plate and the heat exchange fins are integrally processed by using a 3D printing method.

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