Heat storage device and heating and ventilation system

Abstract

The utility model discloses a heat storage device and a heating and ventilation system, and the heat storage device comprises a shell, a phase change material and a heat exchange assembly; the shell is provided with an accommodating cavity; the phase change material is accommodated in the accommodating cavity; the heat exchange assembly is connected to the shell, the heat exchange assembly comprises a heat exchange pipeline and heat exchange fins, the heat exchange pipeline and the heat exchange fins are located in the containing cavity, the heat exchange pipeline is embedded in the phase change material, the heat exchange pipeline comprises a collecting pipe and a plurality of coil pipes communicated with the collecting pipe, the heat exchange fins are fixed to each coil pipe, and the heat exchange fins are arranged in the collecting pipe. The projections of the heat exchange fins on every two adjacent coil pipes in the extension direction of the coil pipes are partially overlapped. According to the technical scheme, the heat exchange efficiency of the heat storage device can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchange equipment, and in particular to a heat storage device and a heating and ventilation system. Background Art

[0002] Thermal storage heating modules in HVAC systems are one of the key technologies for efficient energy management. They can store thermal energy and release it when needed to meet the heat needs of heating, cooling or industrial processes.

[0003] In the related art, the heat storage device of the HVAC system is often in the form of a hot water tank, using water itself as the heat storage medium. In addition, the heat exchange in the water tank is often performed by using a stainless steel bare tube inner disk for water-to-water heat exchange, or an aluminum tube outer disk for fluorine-water heat exchange, and the heat exchange efficiency is low. Utility Model Content

[0004] The embodiments of the present application provide a heat storage device and a HVAC system, which can improve the heat exchange efficiency of the heat storage device.

[0005] In the first aspect, an embodiment of the present application provides a heat storage device, which includes a shell, a phase change material and a heat exchange component; the shell has a accommodating cavity; the phase change material is accommodated in the accommodating cavity; the heat exchange component is connected to the shell, and the heat exchange component includes a heat exchange pipe and heat exchange fins located in the accommodating cavity, the heat exchange pipe is buried in the phase change material, the heat exchange pipe includes a collecting pipe and a plurality of coils connected to the collecting pipe, and the heat exchange fins are fixed on each of the coils, wherein the projections of the heat exchange fins on two adjacent coils in the extension direction of the coils overlap.

[0006] In some embodiments, each of the coils includes at least two straight pipe sections and a curved pipe section connected between two adjacent straight pipe sections, a heat exchange gap is provided between two adjacent straight pipe sections, the heat exchange fins are connected to the straight pipe sections, and the projections thereof along the extension direction of the coils overlap in the heat exchange gap.

[0007] In some embodiments, the heat exchange fins extend in a spiral shape in the length direction of the straight tube section.

[0008] In some embodiments, the heat exchange fins on each of the straight tubes include a plurality of fin units, and the fin units are spaced apart in the length direction of the straight tube section.

[0009] In some embodiments, the collecting pipe is partially located in the accommodating cavity and partially extends to the outside of the shell, and the collecting pipe includes: a first collecting pipe, which is connected to one of the straight pipe sections of the coil; and a second collecting pipe, which is connected to the other straight pipe section of the coil; wherein the first collecting pipe and the second collecting pipe are both located on the same side of the plurality of coils.

[0010] In some embodiments, the heat exchange assembly further includes a plurality of diverter pipes, one end of each diverter pipe is connected to a corresponding straight pipe section of the coil, and the other end is connected to the first header or the second header.

[0011] In some embodiments, the plurality of coils are arranged in an array, and the length direction of the straight pipe section of each coil is parallel to the vertical direction.

[0012] In some embodiments, the header and the diverter are located above the coil.

[0013] In some embodiments, the plurality of coils are arranged in an array, and the length direction of the straight section of each coil is parallel to the horizontal direction.

[0014] In some embodiments, a plurality of support frames are further included, and two adjacent coils are fixed to each other via a support frame.

[0015] In a second aspect, an embodiment of the present application provides a HVAC system comprising a heat source module, a first utilization unit, and a heat storage device as described above, wherein the heat exchange pipeline comprises a charging flow path and a discharging flow path, the heat source module is connected to the charging flow path to form a charging circuit, and the first utilization unit is connected to the discharging flow path to form a discharging circuit. The heat storage device comprises at least two temperature sensing components, one of which is used to detect a first temperature at a first preset depth within the phase change material, and the other of which is used to detect a second temperature at a second preset depth within the phase change material, wherein the first preset depth is closer to the upstream of the heat storage device than the second preset depth.

[0016] In some embodiments, the HVAC system includes a control module connected to the heat source module, and the control module is used to control the opening or closing of the charging circuit according to the first temperature and the second temperature.

[0017] In some embodiments, the heat source module includes: a main heat source unit and an auxiliary heat source unit; the main heat source unit is connected to the charging flow path, and the main heat source unit includes at least one of a solar energy collection module, a water source heat exchange pipe, and an air source heat exchange pipe; the auxiliary heat source unit is connected to the charging flow path, and the auxiliary heat source unit includes an electric heating module.

[0018] In some embodiments, the HVAC system further includes a second utilization unit, the heat source module is connected to the second utilization unit via a heat transfer pipeline, and the heat transfer pipeline is connected in parallel with the charging flow path.

[0019] In some embodiments, the HVAC system has: a first operating mode, when the HVAC system is in the first operating mode, the heat source module provides heat to the first utilization unit; a second operating mode, when the HVAC system is in the second operating mode, the heat source module provides heat to the second utilization unit.

[0020] The heat storage device in the embodiment of the present application uses a phase-change material as a heat storage medium. This material can absorb or release large amounts of heat energy during the phase change process, which is then used to absorb heat from the outside world and store it within a storage chamber. When the heat from the heat storage device is needed, the heat from the phase-change material is transferred out of the device through heat exchange to release heat to the outside world, thereby achieving heat exchange. Compared to traditional water tanks that use water as a heat storage medium, this effectively increases energy storage density and requires far less heat storage medium than the water used in traditional water tanks. Therefore, for the same heat storage capacity, the size of the heat storage device can be significantly reduced, saving installation space.

[0021] The heat exchange assembly includes a heat exchange pipe and heat exchange fins located in the accommodating cavity. The heat exchange pipe is buried in the phase change material so that the heat exchange pipe can exchange heat with the phase change material. The heat exchange pipe includes a header and multiple coils connected to the header. Compared with the heat exchange pipe, the coil uses a vertical tube to exchange heat, which can effectively reduce the temperature stratification of the phase change material in the heat storage device, thereby improving the heat exchange efficiency. In addition, the coiled arrangement of the heat exchange pipe can reduce the number of pipes in the heat exchange pipe, further reducing the volume of the accommodating cavity, thereby reducing the volume of the shell to save installation space and reduce production costs.

[0022] In addition, heat exchange fins are fixed on each coil, wherein the projections of the heat exchange fins on two adjacent coils in the extension direction of the coils overlap. In this way, when the volume of the accommodating cavity is the same, the spatial density of the heat exchange fins in the accommodating cavity is higher and the heat exchange area is also larger, thereby better improving the heat exchange efficiency. The volume of the shell can be set to be smaller to save space and facilitate installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 This is a schematic structural diagram of an embodiment of the heat storage device of the present application;

[0025] Figure 2 for Figure 1 FIG. 1 is a schematic diagram of an exploded structure of an embodiment of a heat exchange assembly shown in FIG. 2 ;

[0026] Figure 3 for Figure 1 A structural schematic diagram of another embodiment of a heat exchange assembly is shown in FIG;

[0027] Figure 4 for Figure 1 FIG. 1 is a side view of a coil and a heat exchange fin according to an embodiment of the present invention;

[0028] Figure 5 for Figure 4 FIG. 1 is a schematic diagram of a top view of an embodiment of a coil and heat exchange fins;

[0029] Figure 6 This is a structural diagram of an embodiment of the HVAC system of the present application.

[0030] Description of Figure Numbers:

[0031] 100. Heat storage device; 110. Shell; 111. Accommodation chamber; 120. Phase change material; 130. Heat exchange component; 131. Heat exchange pipe; 1311. Collecting pipe; 1311a. First collecting pipe; 1311b. Second collecting pipe; 1312. Coil; 1312a. Straight pipe section; 1312b. Bend pipe section; 132. Heat exchange fin; 133. Heat exchange gap; 134. Diverter pipe; 140. Support frame; 200. HVAC system; 210. Charging flow path; 220. Discharging flow path; 300. Heat source module; 400. First utilization unit; 500. Second utilization unit.

[0032] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of this application clearer, the following part will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0034] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application, as detailed in the appended claims.

[0035] In the description of this application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, in the description of this application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0037] HVAC (Heating, Ventilation, and Air Conditioning) is a system of equipment and control systems used in buildings to provide a comfortable indoor environment. Thermal storage heating modules within HVAC systems are a key technology for efficient energy management. They store thermal energy and release it when needed to meet the thermal demands of heating, cooling, or industrial processes.

[0038] In related technologies, thermal storage heating modules for HVAC systems often utilize hot water tanks, using water itself as the heat storage medium. However, water's heat storage capacity is limited, and providing sufficient hot water requires a large tank, making installation inconvenient. Furthermore, the high pressure inside the tank creates a high risk of corrosion and leakage, posing a certain risk. Furthermore, heat exchange within the tank often involves water-to-water heat exchange using a stainless steel inner tube or fluorine-water heat exchange using an aluminum outer tube, both of which have low heat exchange efficiency.

[0039] To resolve the above issues, please refer to Figures 1 to 3 The present application provides a heat storage device 100, which is used in a heating and ventilation system 200 to store heat. In an embodiment of the present application, the heat storage device 100 includes a housing 110, a phase change material 120, and a heat exchange component 130.

[0040] The shell 110 has a accommodating cavity 111, and the phase change material 120 is accommodated in the accommodating cavity 111. The phase change material 120 (PCMs) is a type of material that can absorb or release a large amount of heat energy during the phase change process. It has the advantages of high energy storage density and stable phase change temperature. The phase change material 120 can be selected from inorganic compounds (such as salts and salt hydrates), organic compounds (such as paraffin, fatty acids) and polymer materials (such as polyethylene glycol PEG).

[0041] The phase change material 120 is housed within the accommodating chamber 111 and is used to exchange heat with the outside world, absorbing heat and then storing it within the accommodating chamber 111. When the heat from the thermal storage device 100 is needed, the heat from the phase change material 120 is transferred out of the thermal storage device 100 through heat exchange to release the heat externally. During the process of absorbing and releasing heat, the phase change material 120 undergoes a phase change. This phase change causes the volume of the phase change material 120 within the accommodating chamber 111 to change. When the phase change material 120 absorbs sufficient heat, it transforms from a solid state to a liquid state, expanding in volume. The accommodating chamber 111 has sufficient space to accommodate the expansion of the phase change material 120, thereby minimizing the pressure on the housing 110. It should be noted that by providing sufficient space to allow the phase change material 120 to expand or contract freely within the accommodating chamber 111, excessive pressure on the housing 110 can be avoided. Accordingly, providing too much excess space will increase the ineffective heat storage volume of the thermal storage device 100.

[0042] The use of phase change material 120 as the energy storage and heat storage medium effectively improves the energy storage density compared to the traditional water tank that uses water as the heat storage medium. The amount of heat storage medium required is much lower than the amount of water in the traditional water tank. Therefore, under the same heat storage requirement, the volume of the heat storage device 100 can be greatly reduced, saving installation space.

[0043] The heat exchange assembly 130 is connected to the housing 110 and includes a heat exchange pipe 131 and heat exchange fins 132 located within the accommodating chamber 111. The heat exchange pipe 131 is embedded within the phase change material 120, enabling heat exchange between the heat exchange pipe 131 and the phase change material 120. The heat exchange pipe 131 includes a header 1311 and a plurality of coils 1312 connected to the header 1311. Compared to the heat exchange pipe 131, the coils 1312 use a vertical tube structure for heat exchange, effectively reducing temperature stratification of the phase change material 120 within the thermal storage device 100, thereby improving heat exchange efficiency. Furthermore, the coiled arrangement of the heat exchange pipe 131 reduces the number of heat exchange pipes 131, further reducing the volume of the accommodating chamber 111. This reduces the volume of the housing 110, saving installation space, lowering manufacturing costs, and reducing the refrigerant charge within the HVAC system 200, further reducing the production and maintenance costs of the air conditioning system.

[0044] In addition, in actual application, the filling amount of the phase change material 120 in the accommodating chamber 111 can be determined according to the required heat storage amount. Moreover, by checking the filling height of the phase change material 120 in the accommodating chamber and the setting position of the coil 1312 in the accommodating chamber 111, if there is a large deviation between the two so that the coil 1312 cannot be completely buried in the phase change material 120, the requirement can be met by changing the number of coils 1312.

[0045] Each coil 1312 is fixed with a heat exchange fin 132, which can be fixed to the coil 1312 by welding, screwing, clamping, etc. The projections of the heat exchange fins 132 on two adjacent coils 1312 in the direction of the coil 1312's extension partially overlap. In this way, when the volume of the accommodating chamber 111 remains the same, the spatial density of the heat exchange fins 132 within the accommodating chamber 111 is higher, and the heat exchange area is also larger, thereby further improving the heat exchange efficiency. The volume of the housing 110 can be set to be smaller, saving space and facilitating installation.

[0046] In order to ensure the heat exchange efficiency, the materials of the heat exchange pipe 131 and the heat exchange fins 132 need to have good thermal conductivity and heat resistance, which may include but are not limited to copper, aluminum, stainless steel, plastic, etc., and can be selected according to the specific application scenario and heat exchange requirements. Moreover, the materials of the heat exchange pipe 131 and the heat exchange fins 132 can be the same, or of course different, and this application does not impose any restrictions on this.

[0047] In some embodiments, each coil 1312 includes at least two straight pipe sections 1312a and a curved pipe section 1312b connected between two adjacent straight pipe sections 1312a. The structure of the curved pipe section 1312b can be a U-shaped bending structure or a V-shaped bending structure. Of course, it can also be other curved pipe structures, and this application does not limit this. Among them, a heat exchange gap 133 is set between two adjacent straight pipe sections 1312a, the heat exchange fins 132 are connected to the straight pipe sections 1312a, and the phase change material 120 can be filled in the heat exchange gap 133, so that each coil 1312 and the heat exchange fins 132 connected to the straight pipe sections 1312a of the coil 1312 can fully contact the phase change material 120, the heat exchange pipes 131 and the heat exchange fins 132 can be thermally connected to the phase change material 120, so that the heat exchange pipes 131 and the heat exchange fins 132 can better exchange heat with the phase change material 120, thereby improving the heat exchange efficiency.

[0048] Please refer to Figures 3 to 5The projections of the heat exchange fins 132 in the heat exchange gap 133 along the extension direction of the coil 1312 partially overlap, that is, the heat exchange fins 132 can overlap with each other in the heat exchange gap 133 without interference, and the size of the heat exchange gap 133 and the spacing between the heat exchange fins 132 can be adjusted by specifically limiting the heat exchange time and the heat exchange power. The space occupied by the heat exchange fins 132 is more dense, so that the heat exchange fins 132 can fully contact with the phase change material 120 in the heat exchange gap 133, further improving the heat exchange efficiency.

[0049] In one structural form, such as Figure 4 As shown, the heat exchange fins 132 extend in a spiral shape in the length direction of the straight tube section 1312a. When the phase change material 120 is filled into the accommodating cavity 111 above the shell 110, the heat exchange fins 132 can guide the flow in the length direction of the straight tube section 1312a. As a result, the phase change material 120 generates a rotating flow in the accommodating cavity 111 during the filling process. This disturbance helps to reduce the flow resistance, so that the phase change material 120 can better reach the bottom wall of the accommodating cavity 111 and better fill the accommodating cavity 111, avoiding the formation of gaps, improving the local heat transfer coefficient, and thus improving the overall heat exchange efficiency.

[0050] In another structural form, the heat exchange fins 132 on each straight tube include multiple fin units, and the fin units are spaced apart in the length direction of the straight tube section 1312a. In this way, when the phase change material 120 is filled into the accommodating cavity 111 above the shell 110, the heat exchange fins 132 can be better prevented from blocking the flow of the phase change material 120 in the filling direction, thereby ensuring the filling efficiency and the filling rate of the phase change material 120, thereby better ensuring the heat exchange efficiency.

[0051] It should be noted that the heat exchange fins 132 are not limited to the above-mentioned arrangement in the longitudinal direction of the straight pipe section 1312a. For example, a plurality of heat exchange fins 132 can be provided, and the plurality of heat exchange fins 132 are arranged in a fan shape and are spaced apart in the longitudinal direction of the straight pipe section 1312a; or, a plurality of heat exchange fins 132 can be provided, and the plurality of heat exchange fins 132 are spaced apart from each other in the longitudinal direction of the straight pipe section 1312a, and an extension direction of each heat exchange fin 132 has an angle with the longitudinal direction of the straight pipe section 1312a. The present application does not limit the arrangement of the heat exchange fins 132 in the longitudinal direction of the straight pipe section 1312a.

[0052] In some embodiments, multiple coils 1312 are arranged in an array, which can be a rectangular array or a circular array, or other arrays, to ensure heat exchange gaps 133 between the coils 1312, so that the phase change material 120 can be evenly filled between adjacent coils 1312, ensuring heat exchange efficiency. In addition, the length direction of the straight pipe section 1312a of each coil 1312 is parallel to the vertical direction, which can save space in the lateral direction of the heat storage device 100, achieve a smaller volume setting, save costs, and adapt to different installation scenarios; alternatively, multiple coils 1312 are arranged in an array, and the length direction of the straight pipe section 1312a of each coil 1312 is parallel to the horizontal direction, so that the refrigerant can flow horizontally in the straight pipe section 1312a, reducing the influence of gravity during flow, thereby improving heat exchange efficiency. At the same time, such an arrangement is easier for the installation and maintenance of the coils 1312.

[0053] Since the coils 1312 can be arranged in an array combination as described above, the shape of the shell 110 can be designed accordingly to match the arrangement of the coils 1312. At the same time, it can also take into account that the heat storage device 100 can be better matched and installed when it is in a specific installation space. The shape of the shell 110 can include but is not limited to a cylindrical, elliptical or hexagonal shape, etc., and this application does not impose any restrictions on this.

[0054] Specifically, the shell 110 can include an outer shell and an inner shell. The inner shell can be arranged inside the outer shell, and the inner shell can have a accommodating cavity 111, which can facilitate heat exchange between multiple coils 1312 and the phase change material 120 in the accommodating cavity 111. The heat exchange pipe 131 is partially arranged in the accommodating cavity 111, and the other part can extend out of the inner shell from the accommodating cavity 111 and is located between the inner shell and the outer shell.

[0055] The manifold 1311 is partially located within the accommodating chamber 111 and partially extends outside the housing 110. The manifold 1311 includes a first manifold 1311a and a second manifold 1311b. The first manifold 1311a is connected to one straight pipe section 1312a of the coil 1312, and the second manifold 1311b is connected to the other straight pipe section 1312a of the coil 1312. The first manifold 1311a and the second manifold 1311b are both located on the same side of the multiple coils 1312, which can help improve the flow characteristics of the refrigerant flowing therein, reduce flow resistance, increase flow efficiency, and thus improve heat exchange efficiency. It can also enhance the stability of the overall structure, facilitate installation and maintenance, and reduce the risk of leakage.

[0056] Heat exchange assembly 130 also includes multiple shunt tubes 134. One end of each shunt tube 134 is connected to a corresponding straight section 1312a of a coil 1312, and the other end is connected to either the first header 1311a or the second header 1311b. Furthermore, a capillary distributor (not shown) is disposed between the second header 1311b and the shunt tubes 134. This capillary distributor can more precisely control the direction and flow rate of the refrigerant, achieving uniform distribution and thus improving heat exchange efficiency.

[0057] During the heat storage process, the gaseous high-temperature refrigerant is distributed from the first header 1311a through the diverter 134 and enters the coil 1312 of the heat exchange pipe 131. After flowing through the multiple coils 1312, the gaseous refrigerant exchanges heat with the phase change material 120, condenses into liquid refrigerant and is gathered by the diverter 134 to the capillary distributor between the second header 1311b and the diverter 134, and then flows out through the second header 1311b. During the process, the liquid high-temperature refrigerant is distributed from the second collecting pipe 1311b through the diverter pipe 134 and enters the coil 1312 of the heat exchange pipe 131. After the liquid refrigerant flows through multiple coils 1312, it exchanges heat with the phase change material 120, vaporizes into gaseous refrigerant and converges to the first collecting pipe 1311a through the diverter pipe 134, and then flows out through the first collecting pipe 1311a, thereby realizing the entire heat storage and heat release process of the heat storage device 100.

[0058] Among them, the number of pipes of the coil 1312 distributed by the diversion pipe 134 can be determined by parameters such as the height of the heat exchange pipe 131 in the accommodating chamber 111 or the straight pipe extension length of a single coil 1312. For example, if the height of the heat exchange pipe 131 in the accommodating chamber 111 is too high, or the straight pipe extension length of a single coil 1312 is too long, in order to reduce the volume of the heat storage device 100 while ensuring the heat exchange efficiency, the number of pipes of the coil 1312 can be adaptively reduced, and vice versa, it can be adaptively increased.

[0059] In addition, when multiple coils 1312 are arranged in an array and the length direction of the straight pipe section 1312a of each coil 1312 is parallel to the vertical direction, the collecting pipe 1311 and the diverter pipe 134 are located above the coil 1312, which can make the refrigerant in the collecting pipe 1311 and the diverter pipe 134 flow more smoothly, reduce the pressure loss during the flow process, and improve the fluid flow efficiency, so that it flows more evenly into the coil 1312, thereby improving the heat exchange efficiency. Moreover, the collecting pipe 1311 and the diverter pipe 134 are located above the coil 1312, which can also save the space occupied by the heat storage device 100 in the lateral direction, thereby further saving installation space to better adapt to different installation scenarios.

[0060] In some embodiments, the heat storage device 100 also includes multiple support frames 140, and two adjacent coils 1312 are fixed to each other through a support frame 140. The support frame 140 can be formed into a square plate or a circular plate or other structural form, and can be fixed to the two adjacent coils 1312 by threaded connection or welding, etc., which can ensure the heat exchange gap 133 between the two adjacent coils 1312. The support frame 140 can also distribute the weight of the multiple coils 1312 to the multiple support frames 140 respectively, thereby reducing the pressure on the shell 110 when the multiple coils 1312 are fixed in the shell 110, thereby ensuring the stability and safety of the overall structure.

[0061] This application also proposes a HVAC system 200, including but not limited to air conditioners, multi-split units, heat pumps, swimming pool machines, water heaters and other equipment. Figure 1 、 Figure 2 and Figure 6 The HVAC system 200 includes a heat source module 300, a first utilization unit 400 and a heat storage device 100. The specific structure of the heat storage device 100 refers to the above embodiment. Since the HVAC system 200 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0062] In some embodiments, the heat exchange pipe 131 includes a charging flow path 210 and a discharging flow path 220. The heat source module 300 is connected to the charging flow path 210 to form a charging circuit, and the first utilization unit 400 is connected to the discharging flow path 220 to form a discharging circuit. The charging flow path 210 can transfer heat to the phase change material 120 contained in the heat storage device 100. The phase change material 120 can store heat, and the discharging flow path 220 can absorb the heat of the phase change material 120 to heat cold water.

[0063] There are multiple charging flow paths 210 and discharging flow paths 220, and four collecting pipes 1311 are provided. The four collecting pipes 1311 are all arranged on the top of the multiple coils 1312, and the four collecting pipes 1311 respectively have a charging inlet, a charging outlet, a discharging inlet and an discharging outlet.

[0064] Specifically, the manifold 1311 with a charging inlet is connected to the top of multiple charging flow paths 210, and the manifold 1311 with a charging outlet is connected to the bottom of multiple charging flow paths 210, so that after the heat exchange medium enters a manifold 1311 from the charging inlet, it can flow into multiple charging flow paths 210 from the top respectively. After the heat exchange medium undergoes heat exchange in multiple charging flow paths 210, the heat exchange medium in multiple charging flow paths 210 is collected from the bottom to another manifold 1311 and flows out from the charging outlet, completing a heat exchange cycle.

[0065] Similarly, the manifold 1311 with an energy release inlet is connected to the bottom of multiple energy release paths 220, and the manifold 1311 with an energy release outlet is connected to the top of multiple energy release paths 220. Cold water can enter one manifold 1311 from the energy release inlet and then be diverted into multiple energy release paths 220. After the cold water absorbs heat and becomes hot water, the hot water in multiple energy release paths 220 is collected in another manifold 1311 and flows out from the energy release outlet, completing a cold water heating cycle. It can divert a large flow of cold water into multiple small flow streams of cold water for heat exchange. After the multiple small flow streams of cold water are heated, the multiple small flow streams of hot water are collected together for users to use. Since the small flow of cold water can be quickly heated and turned into hot water, it is possible to heat the cold water in time for users to use. Therefore, by utilizing the heat storage and release characteristics of the phase change material 120, heat exchange is performed with the water in the energy release flow path 220, which can not only instantly supply users with a large flow of hot water, but also eliminate the need to use a water tank to store water, thereby preventing the growth of microorganisms such as Legionella.

[0066] In some embodiments, the heat source module 300 includes a main heat source unit and an auxiliary heat source unit. The main heat source unit is in communication with the charging flow path 210, and the auxiliary heat source unit is in communication with the charging flow path 210, and both are capable of transferring heat to the phase change material 120 through the charging flow path 210. The main heat source unit includes at least one of a solar heat collection module, a water source heat exchange pipe 131, and an air source heat exchange pipe 131. When conditions permit, more environmentally friendly natural energy sources such as solar heat collection modules, water source heat exchange modules, and air source heat exchange modules are preferentially used to exchange heat with the phase change material 120, thereby saving energy. The auxiliary heat source unit includes an electric heating module. When the main heat source unit is insufficiently supplied with energy, the auxiliary heat source unit can provide energy to ensure the stability and continuity of the heat energy supply.

[0067] In some embodiments, the thermal storage device 100 includes at least two temperature-sensing components, one of which is used to detect a first temperature at a first preset depth within the phase-change material 120, and the other of which is used to detect a second temperature at a second preset depth within the phase-change material 120. The first preset depth is closer to the upstream of the thermal storage device 100 than the second preset depth. The phase-change material 120 can be divided into a high-temperature zone and a low-temperature zone along its depth. In other words, one of the two temperature-sensing components can extend into the high-temperature zone to detect the first temperature of the phase-change material 120 in the high-temperature zone, and the other of the two temperature-sensing components can extend into the low-temperature zone to detect the second temperature of the phase-change material 120 in the low-temperature zone. The temperature range of the high-temperature zone is greater than or equal to 58°C and less than or equal to 65°C, and the temperature range of the low-temperature zone is less than or equal to 10°C. Therefore, based on the measured first and second temperatures, it can be determined whether the phase-change material 120 needs to be charged.

[0068] In some embodiments, the HVAC system 200 also includes a control module, which is connected to the heat source module 300. When the first temperature and the second temperature are both lower than the first preset temperature, the control module can turn on the heat source module 300, transfer heat to the phase change material 120 through the charging flow path 210, and the temperature of the phase change material 120 continues to rise; when the first temperature and the second temperature are both higher than the second preset temperature, the control module can turn off the heat source module 300, that is, turn off the charging flow path 210. The first temperature and the second temperature measured by the two temperature sensing components can easily grasp the timing of turning on the heat source module 300.

[0069] In addition, the control module has a preset temperature threshold. When the first temperature is lower than the temperature threshold, it indicates that the phase change material 120 has released all the heat. The control module can control the charging circuit to open and transfer the heat to the phase change material 120. When the second temperature is higher than the temperature threshold, it indicates that the phase change material 120 has stored all the heat. The control module can control the charging circuit to close and stop transferring heat to the phase change material 120.

[0070] In some embodiments, the HVAC system 200 also includes a second utilization unit 500, which can be connected to the heat source module 300 through a heat transfer pipeline. The heat transfer pipeline is also connected in parallel with the charging flow path 210, so that the second utilization unit 500 and the first utilization unit 400 utilize the heat source module 300. Optionally, the second utilization unit 500 is a temperature control module, which is used to adjust the indoor temperature.

[0071] The HVAC system 200 also has a first operating mode and a second operating mode. When the HVAC system 200 is in the first operating mode, the heat source module 300 can provide heat to the phase change material 120, allowing the first utilization unit 400 to absorb the heat stored in the phase change material 120 to heat cold water, thereby providing hot water to the user. When the HVAC system 200 is in the second operating mode, the heat source module 300 can provide heat to the second utilization unit 500, allowing the second utilization unit 500 to adjust the indoor temperature.

[0072] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0073] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A heat storage device, characterized in that: include: A housing having a receiving cavity; Phase change material, accommodated in the accommodation cavity; as well as A heat exchange assembly is connected to the shell, and the heat exchange assembly includes a heat exchange pipe and heat exchange fins located in the accommodating cavity. The heat exchange pipe is buried in the phase change material. The heat exchange pipe includes a header and a plurality of coils connected to the header. The heat exchange fins are fixed on each of the coils, wherein the projections of the heat exchange fins on two adjacent coils in the extension direction of the coils overlap.

2. The heat storage device according to claim 1, wherein Each of the coils includes at least two straight pipe sections and a curved pipe section connected between two adjacent straight pipe sections. A heat exchange gap is provided between two adjacent straight pipe sections. The heat exchange fins are connected to the straight pipe sections, and their projections along the extension direction of the coil overlap in the heat exchange gap.

3. The heat storage device according to claim 2, wherein: The heat exchange fins extend in a spiral shape in the length direction of the straight tube section.

4. The heat storage device according to claim 2, wherein: The heat exchange fins on each of the straight tubes include a plurality of fin units, and the fin units are arranged at intervals in the length direction of the straight tube section.

5. The heat storage device according to any one of claims 2 to 4, characterized in that The manifold is partially located in the accommodating cavity and partially extends to the outside of the shell. The manifold includes: a first header, connected to one of the straight pipe sections of the coil; a second header, connected to the other straight pipe section of the coil; The first header and the second header are both located on the same side of the plurality of coils.

6. The heat storage device according to claim 5, characterized in that The heat exchange assembly further includes a plurality of shunt pipes, one end of each shunt pipe being in communication with a corresponding straight pipe section of the coil, and the other end being in communication with the first header or the second header.

7. The heat storage device according to claim 6, wherein The plurality of coils are arranged in an array, and the length direction of the straight pipe section of each coil is parallel to the vertical direction.

8. The heat storage device according to claim 7, wherein: The collecting pipe and the branch pipe are located above the coil.

9. The heat storage device according to claim 6, wherein: The plurality of coils are arranged in an array, and the length direction of the straight pipe section of each coil is parallel to the horizontal direction.

10. The heat storage device according to any one of claims 2 to 4, characterized in that: It also includes a plurality of support frames, and two adjacent coils are fixed to each other through a support frame.

11. A heating and ventilation system, characterized in that: The heat storage device comprises a heat source module, a first utilization unit, and the heat storage device according to any one of claims 1 to 10, wherein the heat exchange pipeline comprises a charging flow path and a discharging flow path, the heat source module is connected to the charging flow path to form a charging circuit, and the first utilization unit is connected to the discharging flow path to form an discharging circuit; the heat storage device comprises at least two temperature sensing components, one of which is used to detect a first temperature at a first preset depth in the phase change material, and the other temperature sensing component is used to detect a second temperature at a second preset depth in the phase change material, the first preset depth being closer to the upstream of the heat storage device than the second preset depth.

12. The HVAC system according to claim 11, wherein: The HVAC system includes a control module connected to the heat source module, and the control module is used to control the opening or closing of the charging circuit according to the first temperature and the second temperature.

13. The HVAC system according to claim 11, wherein: The heat source module comprises: a main heat source unit, connected to the charging flow path, the main heat source unit comprising at least one of a solar heat collection module, a water source heat exchange pipe, and an air source heat exchange pipe; and The auxiliary heat source unit is connected to the charging flow path, and the auxiliary heat source unit includes an electric heating module.

14. The HVAC system according to claim 11, wherein: The HVAC system further includes a second utilization unit. The heat source module is connected to the second utilization unit via a heat transfer pipeline. The heat transfer pipeline is connected in parallel with the charging flow path.

15. The HVAC system according to claim 11, wherein: The HVAC system has: a first operating mode, when the HVAC system is in the first operating mode, the heat source module provides heat to the first utilization unit; and In the second working mode, when the HVAC system is in the second working mode, the heat source module provides heat to the second utilization unit.

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