High efficiency heat storage device with graphene coating

Abstract

The utility model belongs to the heating and cooling technical field, concretely, it is a kind of high -efficient heat storage device with graphene coating, the heat storage device whole is cuboid or square structure, and the upper and lower rectangle of cuboid or square is used as frame, and multiple current collecting pipes are vertically arranged between the frame, and the heat storage unit is connected between every two opposite current collecting pipes, the heat storage unit is the fin made of metal material, and the fin is hollow to store phase change material, and the two ends of heat storage unit are connected with current collecting pipe, and the heat storage unit is hollow and connected to hollow current collecting pipe, so that a space for phase change material flow is formed, and at the same time, the input pipe and output pipe of phase change material are arranged, which is convenient for phase change material and external circulation, so as to store and release heat.

Description

Technical Field

[0001] This invention belongs to the field of heating and cooling technology, specifically, it is a high-efficiency heat storage device with a graphene coating. Background Technology

[0002] With the increasing severity of global climate change, dual carbon targets have become a common goal pursued by all countries. Dual carbon targets—carbon peaking and carbon neutrality—aim aim to reduce carbon emissions and achieve green, low-carbon, and sustainable development. Achieving carbon neutrality necessitates a zero-carbon and low-carbon energy structure based on renewable energy. In this context, the combination of heat pumps and thermal storage technologies offers a highly promising solution.

[0003] Thermal energy storage technology stores heat energy by heating or cooling a storage medium, allowing the stored energy to be used for heating and cooling at a later time. The application of thermal energy storage technology in buildings and industrial processes can improve overall efficiency and reliability, resulting in better economic benefits, reduced investment and operating costs, reduced environmental pollution, and reduced carbon emissions. Thermal energy storage systems generally store heat in a storage medium; high energy density and high heat release and absorption efficiency are ideal characteristics for all thermal energy storage systems. From the current global research perspective, heat storage can generally be divided into three types: sensible heat storage, latent heat storage, and chemical storage. Among them, sensible heat storage materials cannot maintain a stable temperature during energy release, and have high heat loss during heat exchange, making them unable to retain heat for long periods and having low heat storage capacity, which cannot meet current industrial requirements; chemical heat storage utilizes the reversible endothermic / exothermic reaction process of heat storage materials to store and release heat. Although this method has relatively good heat storage capacity and low heat loss, it faces problems such as corrosion of equipment by heat storage materials, poor heat and mass transfer capabilities, and difficulties in material development, which limit its practical application; latent heat storage technology utilizes phase change materials to absorb or release heat during phase change, thereby exchanging heat, which makes up for the shortcomings of sensible heat storage in that it cannot retain heat for long periods, and has a high energy density, does not involve chemical reactions, and will not cause harm to the ecological environment.

[0004] Therefore, latent heat storage is the most promising technology in the field of thermal energy storage, as it can solve the problem of the mismatch between thermal energy in time and space. Latent heat storage utilizes phase change materials (PCMs) for heat exchange. In current technologies, PCMs are generally stored in vertical microchannel tube devices, which are also commonly referred to as thermal storage devices. Existing thermal storage devices have simple structures, small PCM storage capacities, and insignificant thermal storage effects. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model discloses a high-efficiency thermal storage device. This device improves the heat conversion rate of the phase change material by spraying a graphene coating. The specific technical solution adopted by this utility model is as follows:

[0006] A high-efficiency thermal storage device with a graphene coating includes an integral frame made of metal material. Multiple cylindrical metal pipes, serving as manifolds, are arranged longitudinally along the frame. Thermal storage units, each consisting of metal fins, are positioned between pairs of opposing manifolds. The outer surface of each thermal storage unit is coated with graphene. A connecting pipe, made of metal, is located in the middle of one manifold on one side of the frame and is connected to an input pipe for inputting phase change material. A connecting pipe, also made of metal, is located in the middle of another manifold on one side of the frame and is used to output the phase change material.

[0007] In the above technical solution, the thermal storage device has an overall rectangular or cubic structure. The upper and lower rectangles of the rectangular or cubic structure serve as a frame, and multiple manifolds are vertically arranged between the frames. Thermal storage units are connected between pairs of opposite manifolds. The thermal storage units are made of metal fins, which are hollow and used to store phase change materials. The two ends of the thermal storage units are connected to the manifolds. The hollow thermal storage units are connected to the hollow manifolds, thus forming a space for the phase change materials to flow. At the same time, input and output pipes for the phase change materials are provided to facilitate the flow of the phase change materials with the outside world, thereby causing the storage and release of heat.

[0008] A further improvement to this invention is that the input pipe is configured as a main input pipe and input branch pipes. The main input pipe is connected to multiple input branch pipes via flared connectors, and each input branch pipe is connected to a manifold. By configuring the input pipe as a main input pipe and input branch pipes, the phase change material is input from the main input pipe to the flared connector and then enters the corresponding manifold and the heat storage unit connected to the manifold through the input branch pipes. This ensures synchronous flow, preventing uneven flow that could lead to poor heat storage performance.

[0009] A further improvement to this invention is that multiple heat storage units are arranged between every two related manifolds, with each heat storage unit arranged in parallel. This integrated arrangement of multiple heat storage units saves space and achieves better heat storage performance within the same volume.

[0010] In a further improvement of this invention, the frame, manifold, main inlet pipe, and branch inlet pipe are all made of copper, and the heat storage unit uses fins made of aluminum strip, with hollow fins for storing phase change material. All parts are connected by welding.

[0011] A further improvement to this invention is that the outer surface of the heat storage unit is coated with graphene, and the graphene is a water-based graphene heat dissipation coating. This water-based graphene heat dissipation coating is made from high aspect ratio graphene powder, deionized water, and additives, mixed in a specific ratio using a unique dispersion and grinding technique, and then compounded with resin. It features excellent film-forming properties, good adhesion to various substrates, and high heat dissipation efficiency, and is widely used in various heat dissipation scenarios.

[0012] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model integrates multiple heat storage units together, which greatly saves space and allows more phase change material to be stored in a unit volume, resulting in better heat storage effect; in addition, when the heat storage device needs to work externally, the heat dissipation effect is good because the outer surface of the heat storage unit is coated with graphene. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 yes Figure 1 The main view.

[0015] Figure 3 yes Figure 2 Top view.

[0016] In the diagram, 1-frame, 2-manifold, 3-thermal storage unit, 4-main inlet pipe, 5-branch inlet pipe, 6-connecting pipe, 7-inlet port. Detailed Implementation

[0017] To enhance understanding of this utility model, it will be described in further detail below with reference to the accompanying drawings and embodiments. These embodiments are only used to explain this utility model and do not limit the scope of protection of this utility model.

[0018] Example: Figure 1 , Figure 2 , Figure 3 As shown, a high-efficiency thermal storage device with a graphene coating is disclosed. The device has an overall rectangular or cubic structure. The upper and lower rectangles of the rectangular or cubic structure serve as a frame 1. Multiple manifolds 2 are vertically arranged between the frames 1. Thermal storage units 3 are connected between pairs of opposite manifolds 2. The thermal storage units 3 are made of metal fins, which are hollow and used to store phase change materials. The outer surface of the thermal storage units 3 is coated with graphene. The two ends of the thermal storage units 3 are connected to the manifolds 2. The hollow thermal storage units 3 are connected to the hollow manifolds 2. A metal pipe is set in the middle of the manifolds 2 as a connecting pipe 6. The connecting pipe 6 is connected to an input pipe for inputting phase change materials. A metal pipe is set in the middle of the manifolds 2 on one side of the frame 1 as a connecting pipe 6 for outputting phase change materials.

[0019] In this embodiment, the input pipes are configured as a main input pipe 4 and an input branch pipe 5. This allows the phase change material to flow from the main input pipe 4 to the horn-shaped connector and then through the input branch pipe 5 into the corresponding manifold 2 and the heat storage unit 3 connected to the manifold 2, thus achieving synchronous operation. Multiple heat storage units 3 are arranged between every two related manifolds 2, with each heat storage unit 3 arranged in parallel.

[0020] The specific workflow of this embodiment is as follows: Under the action of an external compressor, the phase change material flows from the inlet 7 through the main inlet 4 and is distributed to each inlet branch pipe 5 through the horn interface and input into the corresponding manifold 2. The manifold 2 is connected to the heat storage unit 3, so that it enters the heat storage unit 3 for storage and thus achieves the effect of heat storage.

[0021] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency thermal storage device with a graphene coating, characterized in that, The device includes an overall frame made of metal. Multiple cylindrical metal pipes, serving as manifolds, are arranged longitudinally along the frame. A heat storage unit, consisting of metal fins, is positioned between each pair of opposing manifolds. The outer surface of each heat storage unit is coated with graphene. A connecting pipe, made of metal, is located in the middle of one manifold on one side of the frame and is connected to an input pipe for inputting phase change material. A connecting pipe, also made of metal, is located in the middle of another manifold on one side of the frame and is used to output phase change material.

2. The high-efficiency thermal storage device with graphene coating according to claim 1, characterized in that, The input pipe is configured as a main input pipe and input branch pipes. The main input pipe is connected to multiple input branch pipes through a horn connector, and each input branch pipe is connected to a collector pipe.

3. The high-efficiency thermal storage device with graphene coating according to claim 2, characterized in that, Multiple thermal storage units are set between each pair of related manifolds, and each thermal storage unit is set in parallel.

4. The high-efficiency thermal storage device with graphene coating according to claim 3, characterized in that, The frame, manifold, main inlet pipe, and branch inlet pipe are all made of copper. The heat storage unit uses fins made of aluminum strip, and the hollow fins are used to store phase change materials.

5. The high-efficiency thermal storage device with graphene coating according to any one of claims 1-4, characterized in that, The outer surface of the heat storage unit is coated with graphene, which is a water-based graphene heat dissipation coating.

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