Small volume graphene-aluminum composite interwall heat exchanger for fluid heat dissipation and preparation method thereof

Abstract

The application discloses a small-size graphene-aluminum composite partition heat exchanger for fluid heat dissipation, and is characterized by comprising a fixed shell. The graphene material is compounded with a traditional aluminum heat dissipation module to form a special graphene high-efficiency heat conduction channel, so that the heat exchange efficiency of a single heat exchange unit is greatly increased, and the overall heat exchange efficiency and heat exchange speed of the heat exchanger are greatly improved. In the heat exchange process, heat is efficiently transmitted through the graphene, which can not only realize efficient transmission inside the heat exchange unit, but also can average heat transmission of a plurality of heat exchange units in the same row, so that the overall heat dissipation effect is balanced. The composite heat exchanger can achieve excellent heat exchange effect in a very short heat exchange stroke (effective distance for heat exchange) and heat exchange time (effective time for heat exchange), and fully meets the small-size and high-efficiency heat transmission demand on site.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, and in particular to a small-volume graphene-aluminum composite indirect heat exchanger for fluid heat dissipation and its preparation method. Background Technology

[0002] Heat exchangers enable efficient heat transfer to target fluids using relatively few resources and are now widely used in fluid heat exchange in modern industrial equipment, heat exchange of incoming air in residential homes, and heat exchange of fuels in the aerospace field. Currently, the most widely used heat exchanger is the "indirect heat exchanger," which is quite compact in size and has a relatively simple operating principle. A heat exchanger is a special structure composed of layers of parallel heat exchange units. Two fluids exchange heat within these units but do not mix. However, with the development of modern industry, the requirements for heat exchanger efficiency are increasing. Traditional indirect heat exchangers suffer from the fatal problem of low heat exchange efficiency. Heat exchange efficiency largely depends on the number and efficiency of the heat exchange units. Simply increasing the number of heat exchange units can improve the heat exchanger's efficiency, but it also increases the overall size and weight of the heat exchanger, which does not meet the small-volume, low-weight requirements of some fields such as aerospace. To meet these on-site requirements, there is an urgent need for a new type of high-efficiency heat exchanger that is efficient, space-saving, and lightweight. Summary of the Invention

[0003] The purpose of this invention is to provide a small-volume graphene-aluminum composite indirect heat exchanger for fluid heat dissipation and its preparation method in order to solve the above-mentioned problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A small-volume graphene-aluminum composite indirect heat exchanger for fluid heat dissipation is characterized by comprising a fixed outer shell, wherein multiple composite heat exchange plates are uniformly distributed on the inner wall of the fixed outer shell, and multiple supports are uniformly distributed between two adjacent composite heat exchange plates.

[0006] Preferably, both the fixed outer shell and the support strip are made of aluminum.

[0007] Preferably, the composite heat exchange plate includes a first aluminum plate, with a first groove on both the upper and lower surfaces of the first aluminum plate, a graphene film embedded inside the first groove, and a second aluminum plate disposed on the outer side of the graphene film.

[0008] A method for fabricating a small-volume graphene-aluminum composite indirect heat exchanger for fluid heat dissipation, comprising the following steps:

[0009] The first step is to take an aluminum plate with a diameter of 300mm*200mm*0.4mm and cut grooves of 300mm*198mm*0.1mm on the top and bottom surfaces;

[0010] The second step involves embedding a high-performance heat dissipation film with dimensions of 300mm*198mm*0.08mm into the upper and lower surfaces of the slotted aluminum plate from the first step, and then sealing it with an aluminum plate of 300mm*200mm*0.02mm, followed by preliminary air-press forming.

[0011] The third step is to vacuum hot press the composite plate from the second step so that the graphene is encapsulated inside the aluminum plate on the top surface, thus obtaining a composite heat exchange plate.

[0012] The fourth step is to weld 300mm*4mm*0.4mm aluminum strips onto the composite board from the third step to divide the board into different channel units.

[0013] Fifth, weld the composite heat exchange plate from the third step onto the structure from the fourth step, and then repeat the fourth step.

[0014] Step 6: Repeat step 5 14 times to weld an aluminum shell with d=2mm on the outside to obtain a 16-layer network structure;

[0015] Step 7: Connect the odd-numbered channels in the grid structure from step 6 to the guide pipe to form a coolant circulation channel;

[0016] Step 8: Connect the even-numbered channels of the network structure in step 7 to the inlet channel to form the coolant channel;

[0017] Step 9: Connect the inlet of the coolant to the hot liquid outlet of the equipment, connect the lower outlet of the coolant to the circulating cooling water inlet, and discharge the failed coolant from the upper outlet. This completes the construction of the fluid heat exchanger.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0019] This application combines graphene material with traditional aluminum heat dissipation modules to form a special graphene high-efficiency heat conduction channel, thereby significantly increasing the heat exchange efficiency of a single heat exchange unit and greatly improving the overall heat exchange efficiency and speed of the heat exchanger. During the heat exchange process, heat is efficiently transferred through graphene, achieving not only efficient heat transfer within the heat exchange unit but also even heat transfer across multiple heat exchange units in the same row, resulting in a balanced overall heat dissipation effect. This patented composite heat exchanger achieves excellent heat exchange performance within an extremely short heat exchange stroke (effective distance for heat exchange) and heat exchange time (effective time for heat exchange), fully meeting the requirements for small-volume, high-efficiency heat transfer in the field. Attached Figure Description

[0020] Figure 1 A front view structural schematic diagram provided according to an embodiment of the present invention is shown;

[0021] Figure 2 A three-dimensional structural schematic diagram provided according to an embodiment of the present invention is shown;

[0022] Figure 3 This diagram illustrates a first-view exploded structural diagram of a composite heat exchange plate according to an embodiment of the present invention.

[0023] Figure 4 This diagram illustrates a composite heat exchange plate structure from an exploded second-view perspective according to an embodiment of the present invention.

[0024] Figure 5 A schematic diagram simulating fluid heat exchange between a composite heat exchanger and a conventional heat exchanger, according to an embodiment of the present invention, is shown.

[0025] Legend:

[0026] 1. Fixed outer shell; 2. Support bar; 3. Composite heat exchange plate; 4. First aluminum plate; 5. First groove; 6. Graphene film; 7. Second aluminum plate. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1-5 The present invention provides a technical solution:

[0029] A small-volume graphene-aluminum composite indirect heat exchanger for fluid heat dissipation includes a fixed outer shell 1. Multiple composite heat exchange plates 3 are uniformly distributed on the inner wall of the fixed outer shell 1, and multiple support strips 2 are uniformly distributed between adjacent composite heat exchange plates 3. Both the fixed outer shell 1 and the support strips 2 are made of aluminum. Each composite heat exchange plate 3 includes a first aluminum plate 4, with first grooves 5 formed on both its upper and lower surfaces. A graphene film 6 is embedded inside the first grooves 5, and a second aluminum plate 7 is disposed on the outer side of the graphene film 6.

[0030] A method for fabricating a small-volume graphene-aluminum composite indirect heat exchanger for fluid heat dissipation, comprising the following steps:

[0031] The first step is to take an aluminum plate with a diameter of 300mm*200mm*0.4mm and cut grooves of 300mm*198mm*0.1mm on the top and bottom surfaces;

[0032] The second step involves embedding a high-performance heat dissipation film with dimensions of 300mm*198mm*0.08mm into the upper and lower surfaces of the slotted aluminum plate from the first step, and then sealing it with an aluminum plate of 300mm*200mm*0.02mm, followed by preliminary air-press forming.

[0033] The third step is to vacuum hot press the composite plate from the second step so that the graphene is encapsulated inside the aluminum plate on the top surface, thus obtaining a composite heat exchange plate.

[0034] The fourth step is to weld 300mm*4mm*0.4mm aluminum strips onto the composite board from the third step to divide the board into different channel units.

[0035] Fifth, weld the composite heat exchange plate from the third step onto the structure from the fourth step, and then repeat the fourth step.

[0036] Step 6: Repeat step 5 14 times to weld an aluminum shell with d=2mm on the outside to obtain a 16-layer network structure;

[0037] Step 7: Connect the odd-numbered channels in the grid structure from step 6 to the guide pipe to form a coolant circulation channel;

[0038] Step 8: Connect the even-numbered channels of the network structure in step 7 to the inlet channel to form the coolant channel;

[0039] Step 9: Connect the inlet of the coolant to the hot liquid outlet of the equipment, connect the lower outlet of the coolant to the circulating cooling water inlet, and discharge the failed coolant from the upper outlet. This completes the construction of the fluid heat exchanger.

[0040] The composite heat exchanger prepared in the above manner was compared with a traditional pure aluminum heat exchanger to simulate fluid heat exchange with hot water at nearly 100°C. A thermal sensor was built into the unit to detect the hot water temperature at different heat exchange stages. The final results are as follows: Figure 5 As shown:

[0041] By comparison, the following conclusions can be clearly drawn:

[0042] I. Composite heat exchangers can achieve superior heat exchange efficiency compared to pure aluminum heat exchangers under the same heat exchange stroke (final outflow fluid temperature of composite heat exchanger: 14.32℃, final outflow fluid temperature of traditional aluminum heat exchanger: 49.47℃).

[0043] Second, the composite heat exchanger exhibits a greater temperature drop rate, demonstrating the effectiveness and efficiency of the graphene heat conduction channel construction, achieving a higher heat exchange efficiency with a shorter heat exchange path.

[0044] Third, compared with traditional aluminum heat exchangers, graphene composite heat exchangers can complete more heat exchange work in a smaller size, highlighting the comprehensive advantages of composite heat exchangers.

[0045] The above description of the embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A small-volume graphene-aluminum composite indirect heat exchanger for fluid heat dissipation, characterized in that, It includes a fixed outer shell (1), the inner wall of which is uniformly distributed with multiple layers of composite heat exchange plates (3), and multiple support bars (2) are uniformly distributed between two adjacent composite heat exchange plates (3). Both the fixed outer shell (1) and the support strip (2) are made of aluminum. The small-volume graphene-aluminum composite indirect heat exchanger for fluid heat dissipation is prepared according to the following steps: The first step is to take an aluminum plate with a diameter of 300mm*200mm*0.4mm and cut grooves of 300mm*198mm*0.1mm on the top and bottom surfaces; The second step involves embedding a high-performance heat dissipation film with dimensions of 300mm*198mm*0.08mm into the upper and lower surfaces of the slotted aluminum plate from the first step, and then sealing it with an aluminum plate of 300mm*200mm*0.02mm, followed by preliminary air-press forming. The third step is to vacuum hot press the composite plate from the second step so that the graphene is encapsulated inside the aluminum plate on the top surface, thus obtaining a composite heat exchange plate. The fourth step is to weld 300mm*4mm*0.4mm aluminum strips onto the composite board from the third step to divide the board into different channel units. Fifth, weld the composite heat exchange plate from the third step onto the structure from the fourth step, and then repeat the fourth step. Step 6: Repeat step 5 14 times to weld an aluminum shell with a diameter of 2mm on the outside to obtain a 16-layer network structure. Step 7: Connect the odd-numbered channels in the grid structure from step 6 to the guide pipe to form a coolant circulation channel; Step 8: Connect the even-numbered channels of the network structure in step 7 to the inlet channel to form the coolant channel; Step 9: Connect the inlet of the coolant to the hot liquid outlet of the equipment, connect the lower outlet of the coolant to the circulating cooling water inlet, and discharge the failed coolant from the upper outlet. This completes the construction of the fluid heat exchanger.

2. The small-volume graphene-aluminum composite indirect heat exchanger for fluid heat dissipation according to claim 1, characterized in that, The composite heat exchange plate (3) includes a first aluminum plate (4), and a first groove (5) is provided on both the upper and lower surfaces of the first aluminum plate (4). A graphene film (6) is embedded inside the first groove (5), and a second aluminum plate (7) is provided on the outside of the graphene film (6).

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