Energy storage device and air conditioning system

Abstract

The application discloses an energy storage device and an air conditioning system. The energy storage device comprises an energy storage container and a heat exchange pipe system. The energy storage container contains energy storage medium in the inner cavity. The heat exchange pipe system is arranged in the energy storage container and comprises a plurality of heat exchange pipes arranged in parallel. The plurality of heat exchange pipes circulate refrigerant to exchange heat with the energy storage medium. Each heat exchange pipe is reciprocally folded to form a serpentine distribution and comprises at least two vertical pipe segments extending in the height direction. The spacing between each vertical pipe segment of the plurality of vertical pipe segments of the plurality of heat exchange pipes and other vertical pipe segments adjacent in different directions is configured within a set spacing range, so that each vertical pipe segment and the adjacent other vertical pipe segments cooperatively cool the enclosed area during the energy storage process. The energy storage device improves the energy storage uniformity.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an energy storage device and an air conditioning system. Background Technology

[0002] Against the backdrop of energy structure transformation and dual-carbon goals, energy storage technology has received widespread attention as an important means to achieve peak shaving and valley filling of electricity and improve the utilization rate of renewable energy. However, existing ice storage devices suffer from poor energy storage uniformity.

[0003] It should be noted that the statements in this background section only provide background information relevant to this application and do not necessarily constitute prior art. Summary of the Invention

[0004] This application provides an energy storage device and an air conditioning system to improve the uniformity of energy storage.

[0005] The first aspect of this application provides an energy storage device, comprising: Energy storage container, the inner cavity of which contains an energy storage medium; and The heat exchange tube system is installed inside the energy storage container and includes multiple heat exchange tubes arranged in parallel. A refrigerant flows through the multiple heat exchange tubes to exchange heat with the energy storage medium. Each heat exchange tube is folded back and forth to form a serpentine distribution and includes at least two vertical tube sections extending along the height direction. In this process, the spacing between each vertical pipe segment of the multiple heat exchange tubes and other adjacent vertical pipe segments in different directions is configured to be within a set spacing range, so that each vertical pipe segment and other adjacent vertical pipe segments can perform coordinated cooling of the enclosed area during the energy storage process.

[0006] In some embodiments, the set spacing range is determined based on the set tube spacing, which is configured to be positively correlated with the set energy storage period of the energy storage device.

[0007] In some embodiments, the relationship between the set tube spacing and the set energy storage period is: D = 5t + 10, where D is the set tube spacing and t is the set energy storage period.

[0008] In some embodiments, the energy storage medium includes a cold storage medium, and the relationship between the set tube spacing and the set energy storage period is configured according to a heat exchange model. The result is obtained, where L is the thickness of the solidified layer of the cold storage medium, k is the thermal conductivity of the cold storage medium, and T is the thermal conductivity of the cold storage medium. ref The temperature of the refrigerant, T ice Let ρ be the phase change temperature of the cold storage medium, ρ be the density of the cold storage medium, and h be the density of the cold storage medium. fg Where D is the latent heat of the cold storage medium, and D is the set tube spacing. The maximum solidification layer thickness of the cold storage medium is half of the set tube spacing. This refers to the diameter of the vertical pipe section.

[0009] In some embodiments, the ratio of the set spacing range to the set tube spacing is between 0.9 and 1.1.

[0010] In some embodiments, the heat exchange tube system includes a plurality of first heat exchange tubes spaced apart in a first direction. Each first heat exchange tube is folded back and forth in a second direction in a first vertical plane perpendicular to the first direction to form a serpentine distribution and includes a first vertical tube segment extending in the height direction and connecting segments disposed at both ends of the first vertical tube segment. The second direction is perpendicular to the first direction.

[0011] In some embodiments, each first heat exchange tube includes ports respectively disposed at both ends in a second direction, and the ports of two adjacent first heat exchange tubes in the plurality of first heat exchange tubes are staggered in the second direction.

[0012] In some embodiments, the heat exchange tube system further includes a plurality of second heat exchange tubes spaced apart in a second direction. Each second heat exchange tube includes a second vertical tube segment and a first connecting segment and a second connecting segment respectively disposed at both ends of the second vertical tube segment to connect with adjacent second vertical tube segments. The second vertical tube segment extends along the height direction and is parallel to a second vertical plane, which is parallel to a first direction. The first connecting segment is inclined relative to the second vertical plane; and / or the second connecting segment is inclined relative to the second vertical plane. The plurality of first heat exchange tubes and the plurality of second heat exchange tubes are staggered.

[0013] In some embodiments, the heat exchange tube system includes a plurality of second heat exchange tubes spaced apart in a first direction. Each second heat exchange tube includes a second vertical tube segment and a first connecting segment and a second connecting segment respectively disposed at both ends of the second vertical tube segment to connect with other adjacent second vertical tube segments. The second vertical tube segment extends along the height direction and is parallel to a first vertical plane, which is perpendicular to the first direction. The first connecting segment is inclined relative to the first vertical plane; and / or the second connecting segment is inclined relative to the first vertical plane.

[0014] In some embodiments, in a horizontal plane perpendicular to the first vertical plane, the angle between the projection of the first connecting segment and the projection of the second connecting segment ranges from 60° ≤ β ≤ 120°.

[0015] In some embodiments, the energy storage device includes two heat exchange tube systems arranged symmetrically in a first direction.

[0016] In some embodiments, the energy storage container includes a cylindrical body, and the heat exchange tube system includes a plurality of third heat exchange tubes spaced apart in the radial direction of the cylindrical body. Each third heat exchange tube is folded back and forth to form a serpentine distribution and includes a plurality of third vertical tube segments extending in the height direction. The projection of the third heat exchange tubes on the horizontal plane is an open zigzag line distributed approximately along the circumferential direction of the cylindrical body.

[0017] In some embodiments, the open-ended zigzag line includes a first segment, a second segment, a third segment, and a fourth segment connected sequentially in the circumferential direction, and the lengths of the first segment, the second segment, the third segment, and the fourth segment are arranged in an increasing order, and the multiple open-ended zigzag lines are arranged in a spiral shape.

[0018] A second aspect of this application provides an air conditioning system including the aforementioned energy storage device.

[0019] Based on the technical solution provided in this application, the energy storage device includes an energy storage container and a heat exchange tube system. The energy storage container contains an energy storage medium. The heat exchange tube system is disposed within the energy storage container and includes multiple heat exchange tubes arranged in parallel. A refrigerant flows through the multiple heat exchange tubes to exchange heat with the energy storage medium. Each heat exchange tube is folded back and forth to form a serpentine distribution and includes at least two vertical tube segments extending along the height direction. The spacing between each vertical tube segment and adjacent vertical tube segments in different directions is configured within a set spacing range, so that during energy storage, each vertical tube segment and its adjacent vertical tube segments can collaboratively cool the enclosed area. In the energy storage device of this application embodiment, the heat exchange tubes are arranged such that the spacing between adjacent vertical tube segments is within a set spacing range. This ensures that the distance between the energy storage medium at different locations and the vertical tube segments is within a certain range, avoiding the problem of uneven heat exchange caused by some energy storage medium being too far from the vertical tube segments. In other words, the energy storage medium at different locations is heat exchanged by multiple vertical pipe sections working together, thereby improving the uniformity of energy storage.

[0020] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a three-dimensional structural diagram of the heat exchange tube system of the energy storage device according to the first embodiment of this application.

[0022] Figure 2 for Figure 1 The diagram shows a top view of the heat exchanger tube system.

[0023] Figure 3 This is a three-dimensional structural diagram of the heat exchange tube system of the energy storage device according to the second embodiment of this application.

[0024] Figure 4 for Figure 3The diagram shows a top view of the heat exchanger tube system.

[0025] Figure 5 for Figure 3 The diagram shows a structural schematic of one embodiment of the energy storage device.

[0026] Figure 6 This is a three-dimensional structural diagram of the heat exchange tube system of the energy storage device according to the third embodiment of this application.

[0027] Figure 7 for Figure 6 The diagram shows the structure of the second heat exchanger tube in the heat exchanger tube system.

[0028] Figure 8 for Figure 7 The diagram shows a top view of the second heat exchange tube.

[0029] Figure 9 for Figure 6 The diagram shows a top view of the heat exchanger tube system.

[0030] Figure 10 for Figure 9 A partially enlarged structural diagram of part M in the diagram.

[0031] Figure 11 This is a schematic diagram of the energy storage device according to the fourth embodiment of this application.

[0032] Figure 12 for Figure 11 The diagram shows a top view of the energy storage device.

[0033] Figure 13 for Figure 11 The diagram shows the structure of the third heat exchange tube of the energy storage device.

[0034] Figure 14 for Figure 13 The diagram shows a top view of the third heat exchange tube.

[0035] Labels for each figure: 100. Heat exchanger tube system; 10. Heat exchanger tubes; 11. First heat exchange tube; 111. First vertical tube section; 112. Connecting section; 11a. First port; 11b. Second port; 12. Second heat exchange tube; 121. Second vertical tube section; 122. First connecting section; 123. Second connecting section; 13. Third heat exchange tube; 131. Third vertical tube section; 132. Third connecting section; 133. Fourth connecting section; 13a. Starting end; 13b. End; 200. Energy storage container; 300. Liquid inlet pipe; 400. Exhaust pipe. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0037] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0038] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0039] The inventors of this application conducted an in-depth study on the energy storage process of the energy storage device and found that the cold / heat of the refrigerant is transferred from the heat exchange tube to the energy storage medium on the outside. The longer the heat transfer path, the greater the thermal resistance. This results in the formation of a thick ice layer in the area near the tube wall of the heat exchange tube, while the ice layer in the area far from the tube wall is very thin or even not frozen, forming a huge ice layer thickness gradient and poor energy storage uniformity.

[0040] To address this issue, this application proposes optimizing the spacing between heat exchange tubes so that the spacing between each heat exchange tube is within a predetermined range. This ensures that the energy storage medium in each region of the energy storage container is within the radiation range of the heat exchange tubes, thereby achieving uniform heat transfer. Furthermore, because the spacing between the heat exchange tubes in this application embodiment is within the predetermined range, the energy storage medium at a certain location within the energy storage container can undergo synergistic heat exchange with heat exchange tubes located at different positions circumferentially, significantly improving heat transfer uniformity and enhancing energy storage uniformity.

[0041] The energy storage device in this application embodiment can be a thermal energy storage device or a cold energy storage device. In the following description of the embodiments, for the purpose of clearly explaining the technical solution, simplifying the description logic, and avoiding repetition, the energy storage device is used as a cold energy storage device, and the energy storage medium is used as a cold energy storage medium as an exemplary carrier for the description. Those skilled in the art should understand that the features and technical effects disclosed below for the cold energy storage device can also be applied to the technical solution of the thermal energy storage device.

[0042] The following is for reference. Figures 1 to 14 The structure of the energy storage device according to some different embodiments of this application will be described in detail.

[0043] refer to Figures 1 to 14 The energy storage device provided in some embodiments of this application includes an energy storage container 200 and a heat exchange tube system 100. The energy storage container 200 contains an energy storage medium. The heat exchange tube system 100 is disposed within the energy storage container 200 and includes a plurality of heat exchange tubes 10 arranged in parallel. A refrigerant flows through the plurality of heat exchange tubes 10 to exchange heat with the energy storage medium. Each heat exchange tube 10 is folded back and forth to form a serpentine distribution and includes at least two vertical tube sections extending along the height direction Z.

[0044] In this configuration, the spacing between each vertical pipe segment of the multiple heat exchange tubes 10 and other adjacent vertical pipe segments in different directions is configured within a set spacing range, so that each vertical pipe segment and other adjacent vertical pipe segments can perform coordinated cooling of the enclosed area during energy storage. The distance between two adjacent vertical pipe segments mentioned here refers to the distance between the centerlines of two adjacent vertical pipe segments.

[0045] refer to Figure 11Some embodiments of this application include an energy storage device comprising an energy storage container 200 and a heat exchange tube system 100. The heat exchange tube system 100 is disposed inside the energy storage container 200 and is in direct or indirect contact with the energy storage medium contained within the energy storage container 200 to achieve heat exchange with the energy storage medium. The energy storage container 200 is used to contain the energy storage medium and provides installation space for the heat exchange tube system 100; its shape can be cylindrical, square, or other shapes depending on actual usage requirements.

[0046] The energy storage medium can be water, or other media with good energy storage performance. For example, when water is used as a cold storage medium, it can absorb and store a large amount of cold energy through temperature changes or phase changes during the cold storage process, and then release the stored cold energy during the cooling process, achieving efficient heat exchange in conjunction with the heat exchange tube system 100. The heat exchange tube system 100 is immersed in the energy storage medium within the energy storage container 200, and the inside of the heat exchange tubes allows for the flow of refrigerant, which indirectly exchanges heat with the energy storage medium through the tube walls, thereby completing the energy storage or energy supply process.

[0047] The heat exchange tube system 100 of this application embodiment includes a plurality of heat exchange tubes 10 arranged in parallel. Compared with the single-directional coil of related technologies, it reduces the flow resistance of the refrigerant and improves the heat exchange effect. The plurality of heat exchange tubes 10 are arranged in parallel within the energy storage container 200. In some embodiments, such as those described in reference... Figure 1 and Figure 3 They can be arranged side-by-side at intervals in the first direction Y; in other embodiments, for example, refer to Figure 6 Multiple heat exchange tubes 10 may also be arranged side-by-side at intervals in the second direction X; or in some other embodiments, such as those described above. Figure 11 Multiple heat exchange tubes 10 can also be arranged side by side at intervals in the radial direction.

[0048] To ensure uniform heat transfer along the vertical Z-direction, each heat exchange tube 10 in this embodiment is folded back and forth to form a serpentine distribution and includes at least two vertical tube segments extending along the vertical Z-direction. (Reference) Figure 1 In the illustrated embodiment, the heat exchange tube 10 is folded back and forth in a serpentine pattern in the first direction X, and includes multiple vertical tube segments extending in the height direction Z, as well as connecting segments for connecting adjacent vertical tube segments. During flow, the refrigerant flows from one vertical tube segment to another through the connecting segments. The heat exchange tube system 100 of this embodiment includes multiple heat exchange tubes 10, and each heat exchange tube 10 further includes at least two vertical tube segments. Therefore, the heat exchange tube system of this embodiment includes multiple vertical tube segments. The space between adjacent vertical tube segments is filled with the aforementioned energy storage medium, which directly contacts the outer wall of the vertical tube segment for heat exchange. The spacing between the energy storage medium and the vertical tube segment directly determines the uniformity of condensation of the energy storage medium during the cooling process.

[0049] Because the spacing between each vertical pipe segment and other adjacent vertical pipe segments in different directions in this embodiment is configured within a set spacing range, the projections of multiple vertical pipe segments enclose an approximately regular polygon. The space inside this approximately regular polygon is the enclosed region, which is surrounded by multiple vertical pipe segments and collectively exerts a cooling effect. Within this enclosed region, the temperature change and condensation process at any point are jointly governed by the surrounding multiple vertical pipe segments, rather than being limited to a single heat source.

[0050] In this embodiment, the spacing between each vertical pipe segment and adjacent vertical pipe segments in different directions is configured within a set spacing range. This allows each vertical pipe segment and its adjacent segments to collaboratively cool the enclosed area during energy storage. In other words, the heat exchange tubes of the energy storage device in this embodiment are arranged such that the spacing between adjacent vertical pipe segments is within the set spacing range. This ensures that the distance between the energy storage medium and the vertical pipe segments at different locations is within a certain range, avoiding uneven icing caused by some energy storage medium being too far from the vertical pipe segments. Alternatively, multiple vertical pipe segments collaboratively cool the energy storage medium at different locations, thereby improving the uniformity of energy storage.

[0051] It should be noted that, in this embodiment of the application, the spacing between each vertical pipe segment and other adjacent vertical pipe segments in different directions is configured to be within a set spacing range. This means that the spacing between each vertical pipe segment and its adjacent vertical pipe segments is within a certain range, which can all be an equal spacing value, or different values ​​within a certain range above and below a spacing value. In some embodiments, the set spacing range is determined based on a set pipe spacing, which is configured to be positively correlated with the set energy storage period of the energy storage device.

[0052] In the design of the above-mentioned set spacing range in this application embodiment, the set pipe spacing is first calculated and obtained. The set pipe spacing is a value. Then, the set spacing range is obtained by appropriately floating up or down based on the set pipe spacing.

[0053] In some embodiments, the ratio of the set spacing range to the set tube spacing is between 0.9 and 1.1. This allows the tube spacing between the various vertical tube sections of the heat exchange tube system to fluctuate within a very small range of the set tube spacing, resulting in better energy storage uniformity.

[0054] The spacing between the tubes is configured to be positively correlated with the set energy storage period of the energy storage device. In other words, when designing the spacing between the vertical tube sections of the heat exchange tube system of the energy storage device in this embodiment, the spacing of each energy storage device is not set to be the same, but is proportionally varied according to the set energy storage period of different energy storage devices, so as to be adaptable to different types of energy storage devices.

[0055] Different types of energy storage devices require different energy storage periods. A longer energy storage period allows for a larger allowable tube spacing. Taking cold storage as an example, the reason is as follows: Cold storage is essentially the process of transferring cold energy from the heat exchange tube walls to the surrounding medium. The speed of this cold energy transfer is limited by the thermal conductivity of the ice layer (frozen layer) itself (ice is a poor conductor of heat). If the energy storage period is limited (e.g., 8 hours at night), the cold energy can only travel a limited distance, therefore the tube spacing cannot be too large, otherwise the central area will not have enough time to freeze. If the allowable energy storage period is longer (e.g., 24 hours, 48 ​​hours, or even longer), the cold energy has more time to transfer to more distant areas.

[0056] In some embodiments, the energy storage device is a cold storage device, the energy storage medium is a cold storage medium, and the relationship between the set tube spacing D and the set energy storage period t is configured according to a heat exchange model. The result is obtained, where L is the thickness of the solidified layer of the cold storage medium, k is the thermal conductivity of the cold storage medium, and T is the thermal conductivity of the cold storage medium. ref The temperature of the refrigerant, T ice Let ρ be the phase change temperature of the cold storage medium, ρ be the density of the cold storage medium, and h be the density of the cold storage medium. fg The latent heat of the cold storage medium is D, which is the set pipe spacing. The maximum solidification layer thickness of the cold storage medium is half the difference between the set pipe spacing D and the diameter of the vertical pipe section. This refers to the diameter of the vertical pipe section. In other words, the heat exchange model in this application is related to the distance between the walls of adjacent vertical pipe sections, i.e., D-2. .

[0057] Taking water as the cold storage medium as an example, the growth of ice layer thickness is limited by heat conduction; the thicker the ice layer, the slower the freezing rate. Therefore, when calculating the set pipe spacing D, it is necessary to consider the temperature field evolution law during the dynamic heat exchange process. Based on this, this application fully considers the freezing rate when obtaining the set pipe spacing D, and therefore proposes a method based on the heat exchange model. Therefore, the set tube spacing obtained in this embodiment takes into account the freezing rate, which is fully adapted to the dynamic process of cold storage, resulting in better performance.

[0058] The aforementioned heat exchange model is a differential integral formula for the ice layer growth rate. Integrating this formula yields the relationship between the solidified layer thickness L of the cold storage medium and the set pipe spacing D and time. Furthermore, a constraint is added: under the optimal pipe spacing, the maximum solidified layer thickness L of the cold storage medium is... max To set the pipe spacing D to half the difference between the vertical pipe section and twice the pipe diameter, i.e., (D-2) ) / 2, and thus obtain the relationship between the set tube spacing D and the set cold storage cycle t.

[0059] When the cold storage medium is water, according to the above heat exchange model, and the maximum solidification layer thickness of the cold storage medium is half the difference between the set pipe spacing D and twice the diameter of the vertical pipe section, i.e., (D-2) After multiple actual tests, the optimal relationship between the set pipe spacing and the set cold storage cycle was found to be: D = 5t + 10, where D is the set pipe spacing and t is the set cold storage cycle. Furthermore, t satisfies 4h < t < 10h.

[0060] After obtaining the aforementioned set tube spacing, this application further proposes to design the arrangement of the heat exchange tube system to further enable the cold energy to radiate in multiple directions in space, avoiding local overcooling or delayed icing. In the following descriptions of embodiments, water is used as an example for the cold storage medium.

[0061] Figure 1 and Figure 2 This is a schematic diagram of the heat exchange tube system of the energy storage device according to the first embodiment of this application.

[0062] like Figure 1 and Figure 2 As shown, in the first embodiment, the heat exchange tube system 100 includes a plurality of first heat exchange tubes 11 spaced apart in the first direction Y. Each first heat exchange tube 11 is folded back and forth in a second direction X in a first vertical plane perpendicular to the first direction Y to form a serpentine distribution, the second direction X being perpendicular to the first direction Y.

[0063] like Figure 1 As shown, in this embodiment, each first heat exchange tube 11 is folded back and forth in a first vertical plane perpendicular to the first direction Y. The first heat exchange tube 11 includes a first vertical tube segment 111 and two connecting segments 112 respectively disposed at both ends of the first vertical tube segment 111. In this embodiment, the first vertical tube segment 111 and the two connecting segments 112 are all located in the same plane, i.e., within the first vertical plane, thus forming a two-dimensional array. Figure 2 As shown, for any given first vertical pipe segment 111, the distance between it and other adjacent vertical pipe segments is within the set pipe spacing range, such as... Figure 2Taking the first vertical pipe segment pointed to by arrow O as an example, the distance between it and other adjacent first vertical pipe segments is set to be approximately the same, all within the set pipe spacing range.

[0064] Thus, taking the first vertical pipe segment pointed to by arrow O and its three adjacent first vertical pipe segments as an example, the line connecting the four first vertical pipe segments roughly forms a square, and the space within the square forms an enclosed area. Therefore, any point within this enclosed area can receive cold radiation from the four first vertical pipe segments, and the distances are basically the same.

[0065] In this embodiment of the application, each first heat exchange tube 11 is folded back and forth in the first vertical plane and multiple first heat exchange tubes 11 are arranged at intervals in the first direction Y. This makes the adjacent first vertical tube sections 111 form a uniformly radiating and connected icing area, avoiding the concentration of cold energy in a single direction and further improving the uniformity of icing.

[0066] In some embodiments, each first heat exchange tube 11 includes ports respectively disposed at both ends in the second direction X, including a first port 11a and a second port 11b. The ports of two adjacent first heat exchange tubes 11 are staggered in the second direction X. Figure 2 In this embodiment, the first port 11a is the left port of the first heat exchange tube 11, and the second port 11b is the right port of the first heat exchange tube 11. In this embodiment, the corresponding ports of the multiple first heat exchange tubes 11 are not aligned, but staggered. Specifically, as shown... Figure 2 As shown, the left ports of adjacent first heat exchange tubes 11 are staggered, and the right ports are also staggered.

[0067] In this embodiment, the ports of adjacent first heat exchange tubes 11 are staggered in the second direction X, which makes the refrigerant inlet positions staggered, thereby making the areas with the largest cold release staggered, and the cooling rate of the cold storage medium in each area more consistent, effectively avoiding local overcooling caused by concentrated inlets, and making the overall icing more uniform.

[0068] like Figure 2 As shown, the ports of adjacent first heat exchange tubes are staggered, and the angle α between the line connecting the ports of two adjacent first heat exchange tubes and the second direction X is 55°~65°, preferably 60°.

[0069] The heat exchange tube system of this application embodiment has a simple structure and uniform arrangement, and its overall shape is relatively regular, making it suitable for cubic energy storage containers.

[0070] Figure 3 and Figure 4 A schematic diagram of the heat exchange tube system of the energy storage device according to the second embodiment of this application is shown.

[0071] like Figure 3 and Figure 4 As shown, in the second embodiment, the heat exchange tube system 100 includes a plurality of second heat exchange tubes 12 spaced apart in the first direction Y. Each second heat exchange tube 12 includes a second vertical tube section 121 and a first connecting section 122 and a second connecting section 123 respectively disposed at both ends of the second vertical tube section 121 to connect with adjacent second vertical tube sections 121. The first connecting section 122 is inclined relative to a first vertical plane. The second connecting section 123 is also inclined relative to the first vertical plane. The first vertical plane is perpendicular to the first direction Y and parallel to the height direction Z.

[0072] A key difference from the first embodiment is that the second heat exchange tube 12 in this application embodiment is not entirely located on the same plane, thus forming a three-dimensional array. Specifically, the second heat exchange tube 12 includes multiple parallel and spaced second vertical tube segments 121, and first connecting segments 122 and second connecting segments 123 respectively disposed at the upper and lower ends of the second vertical tube segments 121 to connect with other second vertical tube segments. The multiple second vertical tube segments 121 extend along the height direction and are parallel to the first vertical plane, while the first connecting segments 122 and second connecting segments 123 are respectively inclined relative to the first vertical plane. Figure 4 As shown in the top view, the projection of the second heat exchange tube 12 in the horizontal plane of this embodiment is formed as a sawtooth structure.

[0073] The second heat exchange tube 12 in this embodiment is formed with a three-dimensional folded structure, thus its heat exchange tube distribution volume is larger, which can increase the heat exchange area and facilitate uniform freezing of the cold storage medium, reducing local overcooling or uneven freezing, thereby improving cooling efficiency. Moreover, this arrangement makes it easier to flexibly set the distance between adjacent vertical tube sections, better adapting it to the set tube spacing range obtained in the above embodiment.

[0074] like Figure 4 As shown, in the second embodiment, within the same second heat exchange tube 12, the distance between adjacent second vertical tube segments 121 is b2, and the distance between two adjacent second heat exchange tubes 12 and adjacent second vertical tube segments 121 is also b2. Specifically... Figure 4 In the illustrated embodiment, for the second vertical pipe segment located in the lower left corner, the distance between it and the two adjacent other second vertical pipe segments is b2, thus enabling the three second vertical pipe segments to simultaneously provide coordinated cooling to the enclosed area.

[0075] like Figure 4As shown, taking the second vertical pipe segment in the lower left corner as an example, the line connecting this second vertical pipe segment and the other two adjacent second vertical pipe segments roughly forms an equilateral triangle. The space inside this equilateral triangle forms an enclosed area. Any point within this enclosed area can receive cold radiation from the three second vertical pipe segments, and the distances are basically the same.

[0076] In some embodiments, in a horizontal plane perpendicular to the first vertical plane, the angle between the projection of the first connecting segment and the projection of the second connecting segment ranges from 60° ≤ β ≤ 120°.

[0077] like Figure 4 As shown, the coil can be folded back and forth along the second direction X at an angle β to form the second heat exchange tube 12, where 60°≤β≤120°, preferably β=120°; then, multiple second heat exchange tubes 12 are arranged at equal intervals along the first direction Y with a spacing of b2, resulting in higher cooling efficiency and promoting ice layer growth between adjacent second heat exchange tubes.

[0078] In the second embodiment, as Figure 3 As shown, in this embodiment, the refrigerant inlet of the second heat exchange tube 12 is much higher than the main body, and the refrigerant outlet of the second heat exchange tube 12 is also much higher than the main body. This allows the main body to be located in a lower region and immersed in the energy storage medium, while the refrigerant inlet and outlet can be far away from the freezing area, reducing the squeezing effect of ice expansion on the refrigerant inlet and outlet joints and improving the reliability of the joints.

[0079] like Figure 5 As shown, in some embodiments, the energy storage device includes two heat exchange tube systems 100 symmetrically arranged in a first direction X. When the length of a single-row coil exceeds a critical value, causing a significant increase in flow resistance, a symmetrical arrangement structure is adopted to achieve multi-directional radiative cooling in the central region. The symmetrical arrangement and segmented structure alleviate the pressure drop problem in long pipe sections and improve refrigerant circulation efficiency.

[0080] Figures 6 to 10 This is a schematic diagram of the heat exchange tube system of the energy storage device according to the third embodiment of this application.

[0081] like Figure 6 , Figure 7 and Figure 8As shown, in the third embodiment, the heat exchange tube system 100 includes a plurality of first heat exchange tubes 11 spaced apart in a first direction Y and a plurality of second heat exchange tubes 12 spaced apart in a second direction X. Each first heat exchange tube 11 is folded back and forth along the second direction X in a first vertical plane perpendicular to the first direction Y to form a serpentine distribution, the second direction X being perpendicular to the first direction Y. Each second heat exchange tube 12 includes a second vertical tube segment 121 and a first connecting segment 122 and a second connecting segment 123 respectively disposed at both ends of the second vertical tube segment 121 to connect with adjacent second vertical tube segments 121. The second vertical tube segment extends along the height direction Z and is parallel to the second vertical plane, the second vertical plane being parallel to the first direction Y and parallel to the height direction Z. Wherein, as... Figure 8 As shown, the first connecting section 122 is inclined relative to the second vertical plane. The second connecting section is also inclined relative to the second vertical plane, and the plurality of first heat exchange tubes 11 and the plurality of second heat exchange tubes 12 are arranged alternately.

[0082] The heat exchanger tube system 100 of the third embodiment is equivalent to a combination of multiple first heat exchanger tubes of the heat exchanger tube system of the first embodiment and multiple second heat exchanger tubes of the heat exchanger tube system of the second embodiment, the difference being that, Figure 7 and Figure 8 As shown, in this embodiment, the reciprocating folding direction of the second heat exchange tube is the first direction Y, while in the second embodiment, the reciprocating folding direction of the second heat exchange tube is the second direction X. Furthermore, the folding angle of the second heat exchange tube is θ = 55°~65°, preferably 60°.

[0083] like Figure 9 As shown, in the third embodiment, the ports of adjacent first heat exchange tubes are staggered, and the angle θ between the line connecting the ports of two adjacent first heat exchange tubes and the second direction X is 55°~65°, preferably 60°.

[0084] like Figure 10 As shown, the two types of folded coil structures are arranged in an alternating pattern to form a hybrid cold source network. Each smallest cold source unit is supported by three independent coils working together to achieve multi-source radiative cooling, effectively avoiding the "cold capacity island" phenomenon caused by single-chain coils and improving icing uniformity and overall efficiency. Moreover, the hybrid structure enhances redundancy, so even if some coils fail, the overall cooling capacity can still be maintained.

[0085] like Figure 9 As shown, the spacing between adjacent vertical pipe sections is b3=D. Preferably, b3=40 mm. Adjacent vertical pipe sections include the vertical pipe sections of adjacent first heat exchange tubes, that is, the spacing between two adjacent first vertical pipe sections, as well as the spacing between the first vertical pipe sections of adjacent first heat exchange tubes and the second vertical pipe sections of second heat exchange tubes. Figures 11 to 14 A schematic diagram of the energy storage device according to the fourth embodiment of this application is shown.

[0086] In the fourth embodiment, the energy storage device includes an energy storage container 200 and a heat exchange tube system 100. The energy storage container 200 includes a cylindrical body, specifically a cylindrical structure with a circular cross-section.

[0087] In some embodiments, the heat exchange tube system 100 includes a plurality of third heat exchange tubes 13 spaced apart in the radial direction of the cylindrical body. Each third heat exchange tube 13 is folded back and forth to form a serpentine distribution and includes a plurality of third vertical tube segments 131 extending in the height direction Z, and the projection of the third heat exchange tube 13 on the horizontal plane is a broken line distributed approximately along the circumferential direction of the cylindrical body.

[0088] Furthermore, multiple third heat exchange tubes 13 are arranged around the center in the radial direction. Inside the energy storage container 200, the cold energy diffuses from the center outwards. Each minimum ice storage unit is acted upon by at least two heat exchange tubes with different paths, achieving dual-source synergistic cooling and effectively eliminating the uneven icing and overcooling problems caused by the radiation accumulation of single-chain coils in local areas. In some embodiments, the broken line includes a first segment, a second segment, a third segment, and a fourth segment connected sequentially in the circumferential direction, and the lengths of the first segment, the second segment, the third segment, and the fourth segment gradually increase, with multiple open broken lines arranged in a spiral shape.

[0089] like Figure 14 As shown, the projection of the third heat exchange tube 13 in this embodiment is an open broken line, i.e., a non-closed broken line. This means that there is a gap between the three vertical tube segments at both ends of the third heat exchange tube 13, forming a flared opening in the projection. The open broken line includes multiple segments, and the angle γ between adjacent segments is an obtuse angle. Here, γ = 110°~130°, preferably 120°. Furthermore, the broken line from its starting point 13a to its ending point 13b includes a first segment, a second segment, a third segment, and a fourth segment. The length of the first segment is D, the length of the second segment is 2D, the length of the third segment is 3D, and the length of the fourth segment is 4D.

[0090] Other locations within the cylindrical cavity are also affected by at least two different heat exchange tubes, achieving synergistic cooling.

[0091] like Figure 12 and Figure 14 As shown, the circular cross-section is fractalized into a regular hexagon to achieve six-dimensional symmetrical cooling. Figure 12 As shown, a regular hexagon (shown as dashed lines) is formed with center P as the center. Then, starting from each corner of the regular hexagon, the path moves clockwise by D, 2D, 3D, 4D, and so on, forming an involute path. The distance of each stage of advancement increases sequentially, forming an adaptively expanding cold source radiation network. This makes the distribution of cold energy in different locations within the energy storage container more uniform.

[0092] like Figure 12 As shown, multiple third vertical pipe segments 131 are arranged around the circumference of the center P of the cylindrical body. The spacing between two adjacent third vertical pipe segments 131 is configured within a set spacing range. Specifically... Figure 12 In the embodiment shown, six third vertical pipe segments 131 are arranged around the center P in the circumferential direction, and the spacing between two adjacent third vertical pipe segments 131 is basically the same, thus forming a regular hexagon. This makes the internal space of the regular hexagon an enclosed area of ​​the six third vertical pipe segments 131. This enclosed area is then subjected to the combined action of the six heat exchange pipes.

[0093] In this embodiment, similarly, the pipe spacing between any third vertical pipe segment and its adjacent third vertical pipe segments is within the set pipe spacing range. Therefore, for other locations within the cylindrical body, at least two third vertical pipe segments will also be arranged around them. These at least two third vertical pipe segments will then jointly cool the enclosed area, resulting in a more uniform distribution of cooling capacity. Of course, in other embodiments not shown in the accompanying drawings, the aforementioned spiral distribution of heat exchange pipes can also be formed starting from a regular pentagon or other regular polygon.

[0094] Moreover, the use of an involute structure enhances redundancy, so that even if some coils fail, the overall cooling capacity can still be maintained.

[0095] like Figure 11 As shown, the energy storage device in this embodiment includes an inlet pipe 300 and an outlet pipe 400. The inlet pipe 300 is connected to the inlet end of a plurality of third heat exchange tubes, and the outlet pipe 400 is connected to the outlet end of a plurality of third heat exchange tubes, thereby forming parallel heat exchange.

[0096] This application also provides an air conditioning system including the above-mentioned energy storage device.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and not to limit them; although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this application or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of this application, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in this application.

Claims

1. An energy storage device, characterized in that: include: An energy storage container (200) has an inner cavity containing an energy storage medium; and A heat exchange tube system (100) is provided in the energy storage container (200) and includes a plurality of heat exchange tubes (10) arranged in parallel. A refrigerant flows in the plurality of heat exchange tubes (10) to exchange heat with the energy storage medium. Each heat exchange tube (10) is folded back and forth to form a serpentine distribution and includes at least two vertical tube segments extending along the height direction (Z). Among them, the distance between each vertical pipe segment of the plurality of heat exchange tubes (10) and other adjacent vertical pipe segments in different directions is configured to be within a set distance range so that each vertical pipe segment and other adjacent vertical pipe segments can perform coordinated cooling of the enclosed area during the energy storage process.

2. The energy storage device according to claim 1, characterized in that, The set spacing range is determined based on the set tube spacing, which is configured to be positively correlated with the set energy storage period of the energy storage device.

3. The energy storage device according to claim 2, characterized in that, The relationship between the set tube spacing and the set energy storage period is: D = 5t + 10, where D is the set tube spacing and t is the set energy storage period.

4. The energy storage device according to claim 2, characterized in that, The energy storage medium includes a cold storage medium, and the relationship between the set tube spacing and the set energy storage period is configured according to a heat exchange model. Wherein, L is the thickness of the solidified layer of the cold storage medium, k is the thermal conductivity of the cold storage medium, and T is the thermal conductivity of the cold storage medium. ref The temperature of the refrigerant, T ice Let ρ be the phase change temperature of the cold storage medium, ρ be the density of the cold storage medium, and h be the density of the cold storage medium. fg Where is the latent heat of the cold storage medium, D is the set tube spacing, and the maximum solidification layer thickness of the cold storage medium is half of the set tube spacing. This refers to the diameter of the vertical pipe section.

5. The energy storage device according to claim 2, characterized in that, The ratio of the set spacing range to the set tube spacing is between 0.9 and 1.

1.

6. The energy storage device according to any one of claims 1 to 5, characterized in that, The heat exchange tube system includes a plurality of first heat exchange tubes (11) spaced apart in a first direction (Y). Each first heat exchange tube (11) is folded back and forth in a second direction (X) in a first vertical plane perpendicular to the first direction (Y) to form a serpentine distribution and includes a first vertical tube segment extending in the height direction (Z) and connecting segments disposed at both ends of the first vertical tube segment. The second direction (X) is perpendicular to the first direction (Y).

7. The energy storage device according to claim 6, characterized in that, Each of the first heat exchange tubes (11) includes ports respectively disposed at both ends in the second direction (X), and the ports of two adjacent first heat exchange tubes (11) are staggered in the second direction (X).

8. The energy storage device according to claim 6, characterized in that, The heat exchange tube system further includes a plurality of second heat exchange tubes (12) spaced apart in the second direction (X). Each second heat exchange tube (12) includes a second vertical tube segment and a first connecting segment and a second connecting segment respectively disposed at both ends of the second vertical tube segment to connect with adjacent second vertical tube segments. The second vertical tube segment extends along the height direction and is parallel to a second vertical plane, which is parallel to the first direction (Y). The first connecting segment is inclined relative to the second vertical plane; and / or the second connecting segment is inclined relative to the second vertical plane. The plurality of first heat exchange tubes (11) and the plurality of second heat exchange tubes (12) are staggered.

9. The energy storage device according to any one of claims 1 to 5, characterized in that, The heat exchange tube system (100) includes a plurality of second heat exchange tubes (12) spaced apart in a first direction (Y). Each second heat exchange tube (12) includes a second vertical tube segment and a first connecting segment and a second connecting segment respectively disposed at both ends of the second vertical tube segment to connect with other adjacent second vertical tube segments. The second vertical tube segment extends along the height direction and is parallel to a first vertical plane, which is perpendicular to the first direction (Y). The first connecting segment is inclined relative to the first vertical plane; and / or the second connecting segment is inclined relative to the first vertical plane.

10. The energy storage device according to claim 9, characterized in that, Within a horizontal plane perpendicular to the first vertical plane, the angle between the projection of the first connecting segment and the projection of the second connecting segment ranges from 60° ≤ β ≤ 120°.

11. The energy storage device according to claim 9, characterized in that, The energy storage device includes two heat exchange tube systems symmetrically arranged in the first direction (X).

12. The energy storage device according to any one of claims 1 to 5, characterized in that, The energy storage container includes a cylindrical body, and the heat exchange tube system includes a plurality of third heat exchange tubes (13) spaced apart in the radial direction of the cylindrical body. Each third heat exchange tube (13) is folded back and forth to form a serpentine distribution and includes a plurality of third vertical tube segments (131) extending in the height direction (Z). The projection of the third heat exchange tube (13) on the horizontal plane is an open broken line distributed approximately along the circumferential direction of the cylindrical body.

13. The energy storage device according to claim 12, characterized in that, The open-ended broken line includes a first segment, a second segment, a third segment, and a fourth segment connected sequentially in the circumferential direction, and the lengths of the first segment, the second segment, the third segment, and the fourth segment are arranged in an increasing order, and the plurality of open-ended broken lines are arranged in a spiral shape.

14. An air conditioning system, characterized in that, Includes the energy storage device as described in any one of claims 1 to 13.

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