Phase change heat storage device and heat storage device having the same

Abstract

The present invention discloses a phase-change heat accumulator and a heat storage device having the same, and relates to the technical field of thermal energy storage, comprising a heat storage module, wherein a plurality of phase-change heat storage units are arranged in the heat storage module; the channels in the first column are defined as first fluid channels, and the channels in the second column are defined as second fluid channels, wherein the first fluid channels and the second fluid channels are distributed in an interval order, and the flow directions of the fluids in the first fluid channels and the second fluid channels are opposite; the front and rear sides of the heat storage module are used as ends, and the ends of the heat storage module are sequentially provided with a flow equalizer, a flow confluence, and a confluence end cover; an output pipe is provided on the confluence mixing chamber; and an input pipe is connected to the confluence cavity; and the heat release time can be prolonged without increasing the volume of the heat storage module, the heat exchange temperature difference between the phase-change material and the fluid is increased, the charging / discharging rate is increased, and the temperature uniformity is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal energy storage, and in particular to a phase change heat accumulator and a heat storage device having the same. Background Art

[0002] Thermal energy storage technology has a wide range of applications. For example, domestic electricity needs to adopt the method of peak shaving and valley filling to relieve the pressure of power grid operation, that is, to store surplus electricity during the low-power consumption period and release and use it in life and production during the peak power consumption period. In addition, thermal energy storage technology is also a common and important component of smart grids.

[0003] Thermal energy storage technologies are divided into sensible heat storage, latent heat storage and thermochemical heat storage. Among them, latent heat storage technology uses phase change material (PCM) as a thermal energy storage medium, and uses the PCM phase change process from solid melting to liquid or from liquid solidifying to solid to store or recover thermal energy. Compared with other thermal storage technologies, it has its own advantages. However, in practice, when the phase change heat accumulator releases heat, there will be problems such as too fast heat release rate, slow water temperature rise, and a single method for regulating the outlet water temperature. Moreover, the phase change heat accumulator is limited by the phase change material and has a slow heat charging speed. In addition, when performing variable heat storage, it is usually necessary to increase or decrease its phase change heat storage unit to achieve this. This process is cumbersome and takes a lot of time. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a phase change heat storage device and a heat storage device having the same.

[0005] The technical solution adopted by the present invention to solve its technical problems is: to provide a phase-change heat accumulator, including a heat storage module, wherein a plurality of phase-change heat storage units are arranged in the heat storage module, spaces are reserved between the phase-change heat storage units in the same row as channels for fluid to pass through, and spaces are also reserved between the phase-change heat storage units in the same column as channels for fluid to pass through, and the channels extend along the front and rear directions; the channels in the first column are defined as first fluid channels, and the channels in the second column are defined as second fluid channels, the first fluid channels and the second fluid channels are distributed in an interval order, and the flow directions of the fluids in the first fluid channels and the second fluid channels are opposite; the front and rear sides of the heat storage module are used as ends, and the ends of the heat storage module are sequentially provided with a flow equalizer, a flow confluence, and a confluence end cover; the flow equalizer is provided with a flow equalizing hole for guiding the fluid in the channel to flow out evenly; the confluence is provided with a confluence end cover A flow collector mixing chamber and a plurality of flow collector inner cavity channels, gaps are left between the flow collector inner cavity channels as flow collector outer cavity channels, and an output pipe is arranged on the flow collector mixing chamber; the space between the inner side of the flow collector end cover and the outer side of the flow collector is connected to the flow collector outer cavity channel as an inlet cavity, and the inlet cavity is connected to an input pipe; the fluid in the first fluid channel flows from the front side to the rear side, and the front side input pipe passes through the front side flow collector end cover, passes through the front side flow collector, the flow collector outer cavity channel, the front side flow equalizer, the first fluid channel, the rear side flow collector, and the rear side flow collector end cover, until it is output from the rear side output pipe; the fluid in the second fluid channel flows from the rear side to the front side, and the rear side input pipe passes through the rear side flow collector end cover, the rear side flow collector, the flow collector outer cavity channel, the rear side flow equalizer, the second fluid channel, the front side flow collector, and the front side flow collector end cover, until it is output from the rear side output pipe.

[0006] The phase change heat accumulator provided by the present invention has at least the following technical effects by adopting the phase change heat storage unit in the heat storage module in conjunction with the first fluid channel and the second fluid channel with opposite flow directions: the heat release time can be extended without increasing the volume of the heat storage module, the heat exchange temperature difference between the phase change material and the fluid can be increased, the charging / discharging rate can be increased, and the temperature uniformity can be improved.

[0007] As some preferred embodiments of the present invention, the heat storage module includes a heat-insulating shell, and the front and rear sides of the heat-insulating shell are open.

[0008] As some preferred embodiments of the present invention, the phase change thermal storage unit is wavy.

[0009] As some preferred embodiments of the present invention, the cross-sections of the phase-change thermal storage unit and the channel are rectangular.

[0010] As some preferred embodiments of the present invention, the flow equalizer is a linear plate structure.

[0011] As some preferred embodiments of the present invention, the confluence device is an "E"-shaped structure.

[0012] As some preferred embodiments of the present invention, a middle pipe is provided between the output pipe and the input pipe.

[0013] A heat storage device according to an embodiment of the second aspect of the present invention includes the above-mentioned phase change heat storage device, which has at least the following technical effects: the heat storage device adopts the phase change heat storage unit in the heat storage module in conjunction with the first fluid channel and the second fluid channel with opposite flow directions, and has at least the following technical effects: without increasing the volume of the heat storage module, the heat release time can be extended, the heat exchange temperature difference between the phase change material and the fluid can be increased, the charging / discharging rate can be increased, and the temperature uniformity can be improved.

[0014] As some preferred embodiments of the present invention, parallel connecting pipes are arranged between the phase change heat accumulators, and a concentrating pipe is arranged on the parallel connecting pipes.

[0015] As some preferred embodiments of the present invention, series connecting pipes are provided between the phase change heat accumulators.

[0016] The beneficial effects of the present invention are:

[0017] 1. The new design uses opposite flow directions in the two flow channels for each phase change thermal storage unit when charging / discharging heat, which prolongs the heat release time;

[0018] 2. The new design uses opposite flow directions in the two flow channels for each phase change thermal storage unit when charging / discharging heat, which increases the heat exchange temperature difference between the phase change material and the fluid, increases the charging / discharging rate, and improves temperature uniformity;

[0019] 3. The new design makes regular bends in the conventional rectangular phase change thermal storage unit, which increases the degree of turbulence of the fluid in the fluid channel and improves the heat exchange rate between the hot fluid and the phase change material;

[0020] 4. The new design makes regular bends in the conventional rectangular phase change thermal storage unit, which greatly increases the heat exchange area between the heat-charging fluid and the phase change material in a limited area, and improves the heat exchange rate between the heat-charging fluid and the phase change material;

[0021] 5. The new design arranges four fluid channels in each phase change heat storage unit to exchange heat in a wrapped form. Compared with the plate heat storage unit, the heat exchange area between the heat exchange fluid and the phase change material is increased;

[0022] 6. The new design can match different heat storage capacities through the number of processes. When the heat storage capacity is low, one of the fluid channels is closed to charge part of the phase change material, thus improving the energy efficiency.

[0023] 7. The new design can match different heat storage amounts by the number of processes. Compared with changing the heat storage amount by adding or reducing phase change heat storage units, the new design has a simpler structure and is more convenient to use.

[0024] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a three-dimensional diagram of a phase change heat accumulator of the present invention;

[0027] Figure 2 It is an internal structure diagram of a phase change heat storage device of the present invention;

[0028] Figure 3 It is a structural exploded diagram of a phase change heat accumulator of the present invention;

[0029] Figure 4 The present invention Figure 1 AA section view;

[0030] Figure 5 The present invention Figure 1 BB cross-sectional view;

[0031] Figure 6 is a three-dimensional diagram of the phase change thermal storage unit of the present invention;

[0032] Figure 7 is a three-dimensional diagram of the confluence device of the present invention;

[0033] Figure 8 is a three-dimensional diagram of a heat storage device of the present invention;

[0034] Fig. 9 is a three-dimensional diagram of another embodiment of a heat storage device of the present invention;

[0035] Fig.10 is a three-dimensional diagram of another embodiment of a heat storage device of the present invention;

[0036] Fig.11 It is a flowchart of the verification calculation program of the present invention;

[0037] Fig.12 It is a comparison chart of outlet water temperature changes between the present invention and the prior art (conventional technology).

[0038] Reference numerals:

[0039] Thermal storage module 100, thermal insulation housing 110, phase change thermal storage unit 120, first fluid channel 130, second fluid channel 140;

[0040] Flow equalizer 200, flow equalizing hole 201, front flow equalizer 210, rear flow equalizer 220;

[0041] The flow combiner 300, the flow combiner mixing chamber 301, the flow combiner inner chamber channel 302, the flow combiner outer chamber channel 303, the front side flow combiner 310, and the rear side flow combiner 320;

[0042] The confluence end cover 400, the confluence cavity 401, the front confluence end cover 410, and the rear confluence end cover 420;

[0043] Output pipe 500 , front output pipe 510 , rear output pipe 520 ; input pipe 600 , front input pipe 610 , rear input pipe 620 , middle pipe 700 ; parallel connecting pipe 800 , central pipe 810 , series connecting pipe 900 . DETAILED DESCRIPTION

[0044] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0045] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] In the description of the present invention, the meaning of "a plurality" is more than two, and "greater than", "less than", "exceed" etc. are understood to exclude the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0047] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0048] Figure 1 is a perspective view of an embodiment of the present invention, referring to Figure 1One embodiment of the present invention provides a phase change heat storage device, including a heat storage module 100. Figure 2 , Figure 3 A plurality of phase change thermal storage units 120 are arranged in the thermal storage module 100. Space is reserved between the phase change thermal storage units 120 in the same row as a channel for fluid to pass through. Space is also reserved between the phase change thermal storage units 120 in the same column as a channel for fluid to pass through. The channel extends along the front and rear directions.

[0049] Further, see Figure 4 , Figure 5 , define the channels in the first column as first fluid channels 130, and the channels in the second column as second fluid channels 140. The first fluid channels 130 and the second fluid channels 140 are distributed in an interval order, and the flow directions of the fluids in the first fluid channels 130 and the second fluid channels 140 are opposite.

[0050] Further, refer to Figure 3 The front and rear sides of the thermal storage module 100 are used as ends, and the ends of the thermal storage module 100 are sequentially provided with a flow equalizer 200, a flow converging device 300, and a converging end cover 400.

[0051] Furthermore, the flow equalizer 200 is provided with flow equalizing holes 201 for guiding the fluid in the channel to flow out evenly.

[0052] Furthermore, the concentrator 300 is provided with a concentrator mixing chamber 301 and a plurality of concentrator inner chamber channels 302 , gaps are left between the concentrator inner chamber channels 302 as concentrator outer chamber channels 303 , and the concentrator mixing chamber 301 is provided with an output tube 500 .

[0053] Furthermore, the space between the inner side of the confluence end cover 400 and the outer side of the confluence device 300 serves as a confluence cavity 401 which is in communication with the confluence device outer cavity channel 303 , and the confluence cavity 401 is connected to an input pipe 600 .

[0054] The fluid in the flow channel enters the confluence cavity 401 in the confluence end cover 400 on one side from the input pipe 600 on one side, and then passes through the confluence outer cavity channel 303 of the confluence 300 on one side, the flow equalizing hole 201 of the flow equalizer 200 on one side, the first fluid channel 130 or the second fluid channel 140, the confluence inner cavity channel 302 of the confluence 300 on the other side, and the confluence inner cavity channel 302 of the confluence 300 on the other side, and is finally discharged from the output pipe 500 on the other side.

[0055] The fluid channel of the new technology is divided into at least two independent channels, and it is assumed that the fluid in the first fluid channel 130 flows from the front to the rear, and the fluid in the second fluid channel 140 flows from the rear to the front: A. The front input pipe 610 passes through the front confluence end cover 400, passes through the front confluence 300, the confluence outer cavity channel 303, the front flow equalizer 200, the first fluid channel 130, the confluence 300 on the rear, and the confluence end cover 400 on the rear, until it is output from the rear output pipe 500; B. The rear input pipe 620 passes through the rear confluence end cover 400, the rear confluence 300, the confluence outer cavity channel 303, the rear flow equalizer 200, the second fluid channel 140, the front confluence 300, and the front confluence end cover 400, until it is output from the rear output pipe 500.

[0056] In this way, the adjacent flow channels of the phase change heat storage unit 120 in each heat storage module 100 have the same flow direction and the opposite flow direction, which significantly improves the heat exchange temperature difference between the heat exchange fluid and the phase change material, and avoids the heat exchange deterioration phenomenon caused by the small or even no heat exchange temperature difference between the heat exchange fluid and the phase change material at the outlet.

[0057] In some embodiments, the thermal storage module 100 includes a heat-insulating outer shell 110, and the front and rear sides of the heat-insulating outer shell 110 are open. The heat-insulating outer shell 110 has a heat-insulating layer to reduce unnecessary heat loss.

[0058] It is conceivable that the output pipe 500 and the input pipe 600 are each provided with at least one switch valve, and the relevant valves are controlled according to the requirements of the application scenario, thereby meeting the requirements of different scenarios.

[0059] In some embodiments, a group of flow equalizers 200, flow concentrators 300, and flow concentrator end covers 400 are respectively provided at the front and rear ends of the heat storage module 100, namely, a front flow equalizer 210, a front flow concentrator 310, a front flow concentrator end cover 410, and a rear flow equalizer 220, a rear flow concentrator 320, and a rear flow concentrator end cover 420.

[0060] When in the normal charge / discharge mode, the heat exchange fluid is split before entering the heat accumulator, the first heat exchange fluid flows into the heat accumulator from the front output pipe 510, and the second heat exchange fluid flows in from the rear output pipe 520. The heat exchange fluid flows into the heat accumulator from the front output pipe 510, passes through the outer chamber channel 303 of the front concentrator 310 (does not enter the concentrator mixing chamber 301 and the concentrator inner chamber channel 302 of the front concentrator 310), the front flow equalizer 210, the first fluid channel 130, the rear concentrator 320 (enters the concentrator mixing chamber 301 and the concentrator inner chamber channel 302 of the rear concentrator 320), and the rear concentrator end cover 420, and flows out from the rear input pipe 620. ; The second heat exchange fluid passes through the rear output pipe 520, the outer cavity channel 303 of the rear concentrator 320 (does not enter the concentrator mixing cavity 301 and the concentrator inner cavity channel 302 of the rear concentrator 320), the rear flow equalizer 220, the second fluid channel 140, the front concentrator 310 (enters the concentrator mixing cavity 301 and the concentrator inner cavity channel 302 of the front concentrator 310), and the front concentrator end cover 410, and flows out through the front input pipe 610. In this mode, the adjacent flow channels of the phase change heat storage unit 120 in each heat storage module 100 have the same flow direction and the opposite flow direction, which significantly improves the heat exchange temperature difference between the heat exchange fluid and the phase change material, and avoids the heat exchange deterioration phenomenon caused by the small or even no heat exchange temperature difference between the heat exchange fluid and the phase change material at the outlet.

[0061] In some embodiments, a plurality of groups of flow equalizers 200 , flow combiners 300 , and flow combiner end covers 400 may be respectively disposed at the front and / or rear ends of the thermal storage module 100 .

[0062] When the heat storage amount is small, if the phase change material of the entire heat accumulator is charged, the temperature of the phase change material after charging will not reach the use temperature. In response to this phenomenon, the present patent can operate a charging mode with variable heat storage amount, where the number of first fluid channels is greater than the number of second fluid channels. At this time, the front output pipe 510 is opened, and the rear input pipe 620 is closed. The hot fluid flows from the front output pipe 510 into the heat accumulator, passes through the front confluence end cover 410, the front confluence 310, the confluence outer cavity channel 303, the front flow equalizer 210, the first fluid channel 130, the rear confluence 320, and the rear confluence end cover 420, and flows out through the rear input pipe 620. When the heat storage amount is smaller, close the front output pipe 510 and open the rear input pipe 620, then the hot fluid flows from the rear input pipe into the heat exchanger through the rear conduit end cover 420, the rear conduit 320, the conduit outer cavity channel 303, the rear flow equalizer 220, the second fluid channel 140, the front conduit 310, and the front conduit end cover 410, and flows out through the front output pipe 510.

[0063] In order to obtain a higher outlet water temperature, the conventional discharge mode has a short process flow and a low fluid flow rate in each fluid channel, which makes the temperature rise of the heat exchange fluid at the outlet of the heat accumulator not high. The variable outlet warm water heat release mode of this patent can better solve this problem. The heat exchange fluid flows into the heat accumulator from the front output pipe 510, passes through the front converging end cover 410, the front converging device 310, the converging device outer cavity channel 303, the front flow equalizer 210, the first fluid channel 130, the rear converging device 320, and the rear converging end cover 420, and flows out from the rear input pipe 620 through the rear converging end cover 420; the rear input pipe 620 is connected to the rear output pipe 520 through the connecting pipe 20 and the valve 19. The heat-filled fluid flows into the heat exchanger from the rear input pipe, passes through the rear converging end cap 420, the rear converging device 320, the converging device outer cavity channel 303, the rear flow equalizer 220, the second fluid channel 140, the front converging device 310, and the front converging end cap 410, and flows out from the front output pipe 510. Compared with the conventional mode, this operation mode has fewer shunts of the heat exchange fluid, a higher flow rate of the heat exchange fluid in each fluid channel, a higher convection heat transfer coefficient, and a longer process. The heat exchange fluid fully exchanges heat with the phase change material in the channel, increases the temperature of the heat exchange fluid, and thus obtains a higher outlet water temperature.

[0064] Some embodiments, see Figure 6 The phase change heat storage unit 120 is wavy. This design can not only greatly increase the heat exchange area between the heat-filled fluid and the phase change material in a limited area, improve the heat exchange rate between the heat-filled fluid and the phase change material, but also increase the turbulence of the fluid in the fluid channel, thereby improving the heat exchange rate between the heat-filled fluid and the phase change material.

[0065] In some embodiments, the cross-section of the phase-change thermal storage unit 120 and the channel is rectangular, which is more convenient for design and processing.

[0066] In some embodiments, the current equalizer 200 is a linear plate structure, which is easier to install.

[0067] Some embodiments, see Figure 7 The confluence device 300 is an "E"-shaped structure, that is, the confluence device mixing chamber 301 and the three confluence device inner cavity channels 302 are connected together, and two gaps between the three confluence device inner cavity channels 302 are used as the confluence device outer cavity channels 303, which is easy to install and ensures that water flows in various directions do not conflict.

[0068] In some embodiments, a middle pipe 700 is provided between the output pipe 500 and the input pipe 600 to facilitate flexible adjustment of the water flow route as needed.

[0069] In order to prove that this phase change heat storage device has better advantages than conventional heat storage devices in the design of heat exchange fluid flow direction, the heat release simulation of a phase change heat storage unit in a conventional heat storage device and a phase change heat storage device proposed in this patent is performed as follows. Fig.11 As shown:

[0070] 1. Given parameters, including heat storage device structure parameters, heat exchange fluid inlet temperature, heat exchange fluid and phase change material initial temperature and physical property parameters;

[0071] 2. Set the heat accumulator working parameters, including charging / discharging time T, the length C of the phase change heat accumulator, the width K of the heat accumulator, and the height G of the heat accumulator;

[0072] 3. Set the time step dt, including the step sizes dx, dy, and dz in three dimensions

[0073] 4. According to the formula , solve the three-dimensional transient heat conduction differential equation for the phase change material nodes, specifically from the upper boundary node, the middle node, and the upper boundary node. The upper boundary nodes include the upper boundary node of Case1 phase change material, the upper boundary node of Case2 phase change material, and the upper boundary node of Case3 phase change material. The middle nodes include the middle node of Case1 phase change material, the middle node of Case2 phase change material, and the middle node of Case3 phase change material. The upper boundary nodes include the upper boundary node of Case1 phase change material, the upper boundary node of Case2 phase change material, and the upper boundary node of Cast3 phase change material.

[0074] 5. Solve the convection-diffusion differential equations for the nodes of the heat exchange fluid;

[0075] 6. Determine whether the node has been calculated. If not, continue the calculation from step 3;

[0076] 7. Determine whether the set time has been reached. If not, continue counting from step 3.

[0077] The phase-change thermal storage unit 120 is rectangular and wavy, which is difficult to model. In order to reduce the calculation time, the rectangular wavy phase-change thermal storage unit is simplified into a rectangle of the same shape as the conventional phase-change thermal storage unit during simulation calculation. The fluid flow directions of the four channels of the upper and lower and left and right of the conventional phase-change thermal storage unit are the same, while the fluid flow directions of the upper and lower channels of the phase-change thermal storage unit of this patent are opposite to those of the two channels of the left and right.

[0078] In order to compare the heat release time of the phase change heat storage device of the present invention with that of the conventional heat storage device, the heat release simulation is performed on the conventional heat storage device and a heat storage unit in the phase change heat storage device proposed in the present invention, respectively. Fig.12As shown. The phase change thermal storage unit 120 is simplified into a rectangle during simulation calculation. The flow directions of the four channels of the upper and lower and left and right of the conventional thermal storage unit are the same, while the flow directions of the upper and lower channels of the phase change thermal storage unit 120 of the present patent are opposite to those of the two channels of the left and right.

[0079] The length, width and height of the phase change material of the phase change thermal storage unit 120 are 10m, 0.1m and 0.1m respectively, the initial temperature is 75°C, the mass flow rate is 0.001kg / s, and the inlet water temperature is 35°C. The change of the outlet water temperature of the conventional phase change thermal storage unit and the thermal storage of the present invention over time. It can be seen from the figure that the phase change thermal storage device of the present invention has a longer heat release time.

[0080] In some embodiments, a heat storage device includes the above-mentioned phase change heat storage device. For the operation mode in which daily users have low demand for heat storage, and for waste heat recovery in large factories, multiple phase change heat storage devices can be connected according to different needs.

[0081] Some embodiments, see Figure 8 A parallel connection pipe 800 is provided between each phase change heat accumulator, and a central pipe 810 is provided on the parallel connection pipe 800. When the charging fluid has a high mass flow rate and a high charging temperature, multiple phase change heat accumulators can be connected in parallel, such as Figure 8 As shown. Before the heat-charging fluid enters the heat accumulator, it is evenly divided and flows into the front output pipe 510 and the rear input pipe 620 of each heat accumulator respectively, and flows out from the rear input pipe 620 and the front output pipe 510 in turn. After the heat exchange fluid flows out of the outlets of each heat accumulator, it is converged and discharged. Due to the high mass flow rate, the convective heat transfer thermal resistance on the water side has little effect on the whole. Therefore, this connection method can be used to charge the heat accumulator.

[0082] Some embodiments, see Fig. 9 , Fig.10 A series connection pipe 900 is provided between each phase change heat storage device.

[0083] In this embodiment, optionally, refer to Fig. 9 When the charging fluid has a low mass flow rate and a high charging temperature, multiple phase change heat accumulators can be connected in series, such as Fig. 9As shown. The heat-charging fluid flows in from the front output pipe 510 and the rear input pipe 620 of the first heat accumulator, and flows out from the rear input pipe 620 and the front output pipe 510 in turn. Open the switch valve of the rear output pipe 520 and the switch valve of the rear input pipe 620, and close the switch valve of the middle connecting pipe 700 at the same time. At this time, the rear input pipe 620 and the front output pipe 510 of the first heat accumulator are respectively connected to the front output pipe 510 and the rear input pipe 620 of the second heat accumulator, and are connected in turn. Since the mass flow rate of the heat exchange fluid is small, the convective heat transfer coefficient on the heat exchange fluid side has a great influence on the heat charging rate of the entire heat accumulator, so this connection method can be used to charge the heat accumulator.

[0084] In this embodiment, optionally, refer to Fig.10 , the phase change heat storage device releases heat. When different outlet water temperatures are required, the number of phase change heat storage devices can be matched in series according to the needs, such as Fig.10 As shown. The heat-filled fluid flows in from the front output pipe 510 and flows out from the rear input pipe 620. The switch valve of the rear output pipe 520 and the switch valve of the rear input pipe 620 are closed, and the switch valve of the middle pipe 700 (the middle pipe 700 between the rear output pipe 520 and the rear input pipe 620) is opened at the same time. The heat exchange fluid of the rear input pipe 620 flows out through the middle pipe 700 between the rear output pipe 520 and the rear input pipe 620, flows into the rear input pipe 620, and flows out from the front output pipe 510. The front output pipe 510 of the first heat accumulator is connected to the front output pipe 510 of the second heat accumulator. The route of the heat exchange fluid is the same as that of the first heat accumulator. The number of heat accumulators is matched according to the requirements of the outlet heat exchange fluid temperature.

[0085] In the description of this specification, the description with reference to the terms "some embodiments" or "it is conceivable that" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A phase change heat storage device, characterized in that: Comprising a heat storage module (100), wherein a plurality of phase-change heat storage units (120) are arranged in the heat storage module (100), spaces are left between the phase-change heat storage units (120) in the same row as channels for fluid to pass through, and spaces are also left between the phase-change heat storage units (120) in the same column as channels for fluid to pass through, and the channels extend in the front and rear directions; The channels in the first column are defined as first fluid channels (130), and the channels in the second column are defined as second fluid channels (140), the first fluid channels (130) and the second fluid channels (140) are distributed in an interval sequence, and the flow directions of the fluids in the first fluid channels (130) and the second fluid channels (140) are opposite; The front and rear sides of the heat storage module (100) serve as ends, and the ends of the heat storage module (100) are provided with a flow equalizer (200), a flow concentrator (300), and a concentrator end cover (400) in sequence; The flow equalizer (200) is provided with a flow equalizing hole (201) for guiding the fluid in the channel to flow out evenly; The flow combiner (300) is provided with a flow combiner mixing chamber (301) and a plurality of flow combiner inner chamber channels (302), gaps are left between the flow combiner inner chamber channels (302) as flow combiner outer chamber channels (303), and the flow combiner mixing chamber (301) is provided with an output tube (500); The space between the inner side of the confluence end cover (400) and the outer side of the confluence device (300) serves as a confluence cavity (401) and is in communication with the confluence device outer cavity channel (303); the confluence cavity (401) is connected to an input pipe (600); The fluid in the first fluid channel (130) flows from the front side to the rear side, and the front side input pipe (610) passes through the front side confluence end cover (400), passes through the front side confluence device (300), the confluence outer cavity channel (303), the front side flow equalizer (200), the first fluid channel (130), the rear side confluence device (300), and the rear side confluence end cover (400), until it is output from the rear side output pipe (500); The fluid in the second fluid channel (140) flows from the rear side to the front side, and the rear side input pipe (620) passes through the rear side confluence end cover (400), the rear side confluence device (300), the confluence device outer cavity channel (303), the rear side flow equalizer (200), the second fluid channel (140), the front side confluence device (300), and the front side confluence end cover (400) until it is output through the rear side output pipe (500).

2. A phase change heat storage device according to claim 1, characterized in that: The heat storage module (100) comprises a heat-insulating outer shell (110), and the front and rear sides of the heat-insulating outer shell (110) are open.

3. A phase change heat storage device according to claim 1, characterized in that: The phase-change heat storage unit (120) is wavy in shape.

4. A phase change heat storage device according to claim 1, characterized in that: The cross-sections of the phase-change heat storage unit (120) and the channel are rectangular.

5. The phase change heat storage device according to claim 1, characterized in that: The flow equalizer (200) is a linear plate-shaped structure.

6. A phase change heat storage device according to claim 1, characterized in that: The flow combiner (300) is an "E"-shaped structure.

7. The phase change heat storage device according to claim 1, characterized in that: A middle pipe (700) is provided between the output pipe (500) and the input pipe (600).

8. A heat storage device, characterized in that: It comprises the phase change heat storage device according to any one of claims 1 to 6.

9. A heat storage device according to claim 8, characterized in that: A parallel connecting pipe (800) is provided between each of the phase change heat accumulators, and a concentrating pipe (810) is provided on the parallel connecting pipe (800).

10. A heat storage device according to claim 8, characterized in that: A series connection pipe (900) is provided between each of the phase change heat storage devices.

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