Phase change hot water system and control method thereof

Abstract

The invention relates to a phase-change water heating system and a control method thereof, the phase-change water heating system comprises a phase-change heat exchange liner provided with a water inlet and a water outlet; the water outlet heating module is arranged in the phase change heat exchange inner container and communicated with the phase change heat exchange inner container and the water outlet. And the thermostatic valve is communicated with the water inlet and the water outlet. According to the phase change hot water system, the heat generated by the water outlet heating module can be transferred into the phase change heat exchange inner container without the actions of arranging a water pump and switching a water way, internal water circulation between the phase change heat exchange inner container and the water outlet heating module is achieved, and then the water way of the phase change hot water system can be simplified.

Description

Technical Field

[0001] The present application relates to the technical field of water heaters, and in particular to a phase change hot water system and a control method thereof. Background Art

[0002] Phase change hot water systems usually include four major components: electric heating tubes, phase change heat exchange tanks, water pumps and thermostatic valves. They mainly increase the amount of available hot water through energy storage and heat exchange in the phase change heat exchange tank and heating by the electric heating tubes.

[0003] The existing phase change hot water system has two main states in actual operation, namely energy storage condition and water use condition; in the energy storage condition, the water inlet is closed, the water pump starts working, driving the internal water circulation between the phase change heat exchange tank and the heating tube, and at the same time the electric heating tube starts working to transfer heat to the phase change material in the tank; in the water use condition, the water inlet is opened, the water pump does not work, and the water pressure drives the water path to flow through the phase change heat exchange tank and the heating tube in turn, and finally mixes the cold water through the thermostatic valve and outputs the hot water for use.

[0004] Since the existing phase change hot water system requires a water pump to drive the internal water circulation between the phase change heat exchange tank and the heating tube, the water circuit of the phase change hot water system is relatively complicated. Summary of the invention

[0005] The embodiments of the present application provide a phase change hot water system and a control method thereof, aiming to solve the technical problem that the existing phase change hot water system requires a water pump to drive the internal water circulation between the phase change heat exchange tank and the heating tube, resulting in a relatively complex water circuit of the phase change hot water system.

[0006] In a first aspect, an embodiment of the present application provides a phase change hot water system, the phase change hot water system comprising:

[0007] A phase change heat exchange inner tank, wherein the phase change heat exchange inner tank is provided with a water inlet and a water outlet;

[0008] A water outlet heating module is provided in the phase change heat exchanger inner tank and is connected to the phase change heat exchanger inner tank and the water outlet.

[0009] A thermostatic valve is connected to the water inlet and the water outlet.

[0010] In some embodiments, the water outlet heating module includes a water storage pipe shell, a water outlet pipe and a heating pipe; the water storage pipe shell is provided with a water storage cavity, the heating pipe is arranged in the water storage cavity, the water storage pipe shell is connected to the water outlet pipe and the phase change heat tank, and the water outlet pipe is connected to the water outlet.

[0011] In some embodiments, a water storage inlet and a water storage outlet are provided on the top of the water storage pipe shell, and both the water storage inlet and the water storage outlet are connected to the phase change heat transfer tank.

[0012] In some embodiments, the height of the water storage tube shell is lower than the height of the phase change heat sink.

[0013] In some embodiments, the height difference between the water storage tube shell and the phase change heat sink is 1 cm-10 cm.

[0014] In some embodiments, the phase change heat sink is provided with a phase change material, and the height of the phase change material is lower than the height of the water storage pipe shell.

[0015] In some embodiments, the phase change heat exchange device includes a water inlet pipe, and the water inlet pipe is connected to the phase change heat exchange inner tank and the water inlet.

[0016] In some embodiments, the heating tube is a U-shaped heating tube.

[0017] In a second aspect, an embodiment of the present application further provides a control method for a phase change hot water system, which is applied to the above-mentioned phase change hot water system, and the control method includes:

[0018] determining an operating condition of the phase change hot water system;

[0019] Based on the working condition of the phase change hot water system, the switch states of the water inlet and the water outlet heating module are controlled.

[0020] In some embodiments, the working condition includes an energy storage condition and a water use condition, and the switching state of the water inlet and the water outlet heating module is controlled based on the working condition of the phase change hot water system, including:

[0021] When the phase change hot water system is in the energy storage mode, the water inlet is closed and the water outlet heating module is turned on to heat the water stored in the water storage pipe shell by using the heating pipe and perform heat exchange with the water stored in the phase change heat transfer tank;

[0022] When the phase change hot water system is in water use condition, the water inlet and the water outlet heating module are opened, so that the water outlet heating module reheats the water output from the phase change heat sink.

[0023] The embodiment of the present application provides a phase change hot water system and a control method thereof. The phase change hot water system includes: a phase change heat exchange inner tank, a water outlet heating module and a thermostatic valve, wherein the phase change heat exchange inner tank is provided with a water inlet and a water outlet; the water outlet heating module is arranged in the phase change heat exchange inner tank and is connected to the phase change heat exchange inner tank and the water outlet, and the thermostatic valve is connected to the water inlet and the water outlet. Since the water outlet heating module is arranged in the phase change heat exchange inner tank and is connected to the phase change heat exchange inner tank, the heat generated by the water outlet heating module can be transferred to the phase change heat exchange inner tank without setting a water pump and switching the water circuit, thereby realizing the internal water circulation between the phase change heat exchange inner tank and the water outlet heating module, and thus simplifying the water circuit of the phase change hot water system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0027] Figure 1 A schematic diagram of the structure of a phase change hot water system provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the flow direction of a phase change hot water system provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of energy transfer of a phase change hot water system under energy storage conditions provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of energy transfer of a phase change hot water system under water use conditions provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the structure of a computer device provided in an embodiment of the present application.

[0032] Description of Figure Numbers:

[0033] Phase change heat sink 100, phase change material 101, water inlet 110, water outlet 120, water inlet pipe 130, water outlet heating module 200, water storage pipe shell 210, water storage cavity 211, water storage inlet and outlet 212, water outlet pipe 220, heating pipe 230, thermostatic valve 300. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0035] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0036] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0037] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0038] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0039] As used in this specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0040] Phase change hot water systems usually include four major components: electric heating tubes, phase change heat exchange tanks, water pumps and thermostatic valves. They mainly increase the amount of available hot water through energy storage and heat exchange in the phase change heat exchange tank and heating by the electric heating tubes.

[0041] The existing phase change hot water system has two main states in actual operation, namely energy storage condition and water use condition; in the energy storage condition, the water inlet is closed, the water pump starts working, driving the internal water circulation between the phase change heat exchange tank and the heating tube, and at the same time the electric heating tube starts working to transfer heat to the phase change material in the tank; in the water use condition, the water inlet is opened, the water pump does not work, and the water pressure drives the water path to flow through the phase change heat exchange tank and the heating tube in turn, and finally mixes the cold water through the thermostatic valve and outputs the hot water for use.

[0042] However, the existing phase change hot water system has the following problems in actual work:

[0043] 1. The existing phase change hot water system mainly installs cast aluminum heating tubes outside the phase change heat exchange inner tank. The cast aluminum heating tubes have the advantages of rapid heating, high efficiency and energy saving, and safety and reliability. However, since the cast aluminum heating tubes need to be installed outside the phase change heat exchange inner tank, the cast aluminum heating tubes have energy loss under both energy storage conditions and water use conditions, which makes the available hot water amount of the phase change hot water system relatively limited.

[0044] 2. Under energy storage conditions, a water pump is required to drive the internal water circulation between the phase change heat exchange tank and the heating tube, which makes the water circuit of the phase change hot water system more complicated and increases the overall cost and failure risk of the phase change hot water system.

[0045] 3. Under water-using conditions, in addition to heat loss, the external heating tube is also prone to local overheating during the heating process. Local overheating will not only affect the service life and energy efficiency of the heating tube, but may also increase the risk of safety accidents such as fire and burns.

[0046] In order to solve the above technical problems, the present application provides a phase change hot water system and a control method thereof, which can simplify the water circuit of the phase change hot water system, reduce the energy loss of the phase change hot water system and improve the safety of the use of the phase change hot water system.

[0047] See also Figures 1 to 4The present application provides a phase change hot water system, which includes a phase change heat transfer tank 100, a water outlet heating module 200 and a thermostatic valve 300.

[0048] The phase change heat sink 100 is provided with a water inlet 110 and a water outlet 120;

[0049] The water outlet heating module 200 is disposed in the phase change heat exchanger 100 , and is connected to the phase change heat exchanger 100 and the water outlet 120 .

[0050] The thermostatic valve 300 is connected to the water inlet 110 and the water outlet 120 .

[0051] Since the water outlet heating module 200 is arranged in the phase change heat tank 100 and is connected to the phase change heat tank 100, when the water inlet end is closed, the heat generated by the water outlet heating module 200 can be transferred to the phase change heat tank 100, thereby realizing internal water circulation between the phase change heat tank 100 and the water outlet heating module 200. There is no need to set up a water pump and switch the water circuit, thereby simplifying the water circuit of the phase change hot water system.

[0052] In addition, since the water outlet heating module 200 is arranged in the phase change heat transfer tank 100, that is, completely immersed in the solution of the phase change heat transfer tank 100, the heat of the water outlet heating module 200 can be quickly transferred to the solution of the phase change heat transfer tank 100, thereby reducing heat loss and further reducing the energy loss of the electric heating tube 230.

[0053] In some embodiments, the water outlet heating module 200 includes a water storage pipe shell 210, a water outlet pipe 220 and a heating pipe 230; the water storage pipe shell 210 is provided with a water storage chamber 211, the heating pipe 230 is provided in the water storage chamber 211, the water storage pipe shell 210 is connected to the water outlet pipe 220 and the phase change heat tank 100, and the water outlet pipe 220 is connected to the water outlet 120.

[0054] In this way, under water use conditions, the heating tube 230 can quickly heat the water stored in the water storage tube shell 210 and discharge it directly through the water outlet pipe 220, thereby shortening the heating time of the heating tube 230 and avoiding the situation where the heating tube 230 heats the water but the hot water is dispersed in the solution of the phase change heat tank 100 and cannot be discharged in time.

[0055] In some embodiments, a water inlet and outlet 212 , such as a water inlet and a water outlet, is disposed on the top of the water storage tube housing 210 , and both the water inlet and the water outlet are connected to the phase change heat liner 100 .

[0056] Since a water storage inlet and a water storage outlet are provided on the top of the water storage tube shell 210, and the water storage inlet and the water storage outlet are both connected to the phase change heat exchange inner tank 100, therefore, under the energy storage condition, the water storage inlet 110 is closed, and the heating tube 230 can be used to heat the water stored in the water storage tube shell 210, and the water stored in the water storage tube shell 210 undergoes convection heat transfer with the water stored in the phase change heat exchange inner tank 100 through the water storage outlet, and the water stored in the phase change heat exchange inner tank 100 is directly heated through the tube wall of the hot water storage tube shell 210. After the water stored in the phase change heat exchange inner tank 100 is heated, the water stored in the phase change heat exchange inner tank 100 is used to provide heat for the phase change material 101 in the phase change material 101.

[0057] Under water use conditions, the water inlet 110 is opened, and external cold water is gradually input into the phase change heat exchange tank 100. When the water volume of the phase change heat exchange tank 100 reaches a certain level, the phase change heat exchange tank 100, under the condition of water pressure, will flow part of the stored water of the phase change heat exchange tank 100 through the water storage inlet into the water storage pipe shell 210. The hot water in the water storage pipe shell 210 then flows to the thermostatic valve 300 through the water outlet pipe 220. The thermostatic valve 300 mixes the hot water flowing out of the water outlet pipe 220 with the cold water input from the water inlet 110 into water of target temperature to provide it to users.

[0058] It should be noted that under water use conditions, when the stored water is consumed to a certain extent, the heating pipe 230 can be turned on to allow the heating pipe 230 to reheat the hot water output by the phase change heat tank 100 and then output it to the thermostatic valve 300 through the water outlet pipe 220 for mixing.

[0059] In some embodiments, the height of the water storage pipe housing 210 is lower than the height of the phase change heat sink 100 .

[0060] In some embodiments, the height difference between the water storage tube housing 210 and the phase change heat sink 100 is 1 cm-10 cm.

[0061] Since hot water flows upward, the height difference between the water storage pipe shell 210 and the phase change heat transfer tank 100 is set to 1cm-10cm, so that the height of the water storage pipe shell 210 is slightly lower than the height of the phase change heat transfer tank 100, so that the hot water in the phase change heat transfer tank 100 can flow to the water storage pipe shell 210 as much as possible, and then can be provided to the user through the water outlet pipe 220, thereby ensuring that the user can obtain sufficient hot water supply.

[0062] In some embodiments, the phase change heat liner 100 is provided with a phase change material 101 , and the height of the phase change material 101 is lower than the height of the water storage pipe shell 210 .

[0063] In some embodiments, the phase change heat exchange device includes a water inlet pipe 130 , and the water inlet pipe 130 is connected to the phase change heat exchange inner tank 100 and the water inlet 110 .

[0064] In some embodiments, the heating tube 230 is a U-shaped heating tube.

[0065] Based on the above phase change hot water system, the present application also provides a control method for the phase change hot water system, the control method comprising the following steps:

[0066] Step 110: Determine the working status of the phase change hot water system.

[0067] Step 120: Based on the working condition of the phase change hot water system, control the switch status of the water inlet and the water outlet heating module.

[0068] In some embodiments, the working condition includes an energy storage condition and a water use condition, and step 120 may include the following steps:

[0069] Step 121: When the phase change hot water system is in the energy storage mode, the water inlet is closed and the water outlet heating module is turned on to heat the water stored in the water storage pipe shell by using the heating pipe and perform heat exchange with the water stored in the phase change heat transfer tank.

[0070] See also Figure 3 , Figure 3 The water stored in the heating tube is the water stored in the water storage tube shell, the water storage tube wall in the heating tube is the outer wall of the water storage tube shell, and the water stored in the heat exchange liner is the water stored in the phase change heat exchange liner.

[0071] Specifically, under the energy storage condition, the water inlet or the water inlet pipe is closed, the water outlet heating module is turned on, and the heating tube in the water outlet heating module starts to work. The heating tube heats the water stored in the water storage tube shell, and then uses the water stored in the water storage tube shell and the water stored in the phase change heat transfer tank to generate convection heat transfer, and then directly heats the water stored in the phase change heat transfer tank through the tube wall of the water storage tube shell. After the water stored in the phase change heat transfer tank is heated, heat is provided to the phase change material in the phase change heat transfer tank.

[0072] Step 122: When the phase change hot water system is in water use condition, the water inlet and the water outlet heating module are turned on, so that the water outlet heating module reheats the water output from the phase change heat sink.

[0073] Specifically, see Figure 4Under water use conditions, the water inlet or the water inlet pipe is opened. First, the water stored in the phase change heat exchange tank is pushed out by the water pressure and then flows into the water storage pipe shell. Since the bottom of the water storage pipe shell is connected to the water outlet pipe, the water stored in the phase change heat exchange tank flows to the water outlet pipe through the water storage pipe shell, and then flows out from the water outlet pipe to the thermostatic valve. The thermostatic valve mixes the hot water flowing out of the water outlet pipe with the cold water flowing into the inlet into water of the target temperature to provide it to the user.

[0074] It should be noted that when the stored water is consumed to a certain extent, the cold water flowing in from the water inlet or the water inlet pipe is heat exchanged through the phase change heat tank to obtain hot water with a preliminary increase in temperature. The hot water with a preliminary increase in temperature then flows into the water storage pipe shell, is heated for a second time by the heating pipe, and is finally output from the water outlet pipe to the thermostatic valve to mix with the cold water.

[0075] In this way, the present application adopts a water outlet heating module that integrates an instant heating tube and a water outlet pipe to replace the external heating tube of the tank. In this way, under the energy storage condition, the phase change hot water system only needs to close the water inlet end, and does not need a water pump or the action of switching the water circuit. The heat generated by the heating tube can be transferred to the phase change heat transfer inner tank, thereby realizing the energy storage action of the phase change material and water storage, reducing the complexity of the water circuit and energy loss; under the water use condition, the heating tube can quickly transfer the heat to the water stored in the water storage tube shell, and directly discharge it through the water outlet pipe for mixing with hot water; since the heating tube is completely immersed in the liquid, the heat of the heating tube can be quickly transferred to the solution, thereby avoiding energy loss and the risk of local overheating.

[0076] In addition, the present application only requires a single heating tube to achieve the effects of heat storage and instant heating.

[0077] like Figure 5 As shown, the embodiment of the present application provides a computer device, including a processor 111, a communication interface 112, a memory 113 and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 communicate with each other through the communication bus 114.

[0078] Memory 113, used for storing computer programs;

[0079] In one embodiment of the present application, the processor 111 is used to execute the program stored in the memory 113 to implement the control method of the phase change hot water system provided by any of the above method embodiments, including:

[0080] determining an operating condition of the phase change hot water system;

[0081] Based on the working condition of the phase change hot water system, the switch states of the water inlet and the water outlet heating module are controlled.

[0082] It is understood by those skilled in the art that all or part of the processes in the method for implementing the above embodiment can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a storage medium, which is a computer-readable storage medium. The computer program is executed by at least one processor in the computer system to implement the process steps of the embodiment of the above method.

[0083] Therefore, an embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the control method of the phase change hot water system provided in any of the aforementioned method embodiments are implemented, including:

[0084] determining an operating condition of the phase change hot water system;

[0085] Based on the working condition of the phase change hot water system, the switch states of the water inlet and the water outlet heating module are controlled.

[0086] The storage medium is a physical, non-transient storage medium, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a magnetic disk, or an optical disk, etc., which can store program codes. The computer-readable storage medium can be non-volatile or volatile.

[0087] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0088] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of each unit is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0089] The steps in the method of the embodiment of the present application can be adjusted in order, combined and deleted according to actual needs. The units in the device of the embodiment of the present application can be combined, divided and deleted according to actual needs. In addition, the functional units in the various embodiments of the present application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0090] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, terminal, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application.

[0091] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0092] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0093] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A phase change hot water system, characterized in that: The phase change hot water system comprises: A phase change heat exchange inner tank, wherein the phase change heat exchange inner tank is provided with a water inlet and a water outlet; A water outlet heating module is provided in the phase change heat exchanger inner tank and is connected to the phase change heat exchanger inner tank and the water outlet. A thermostatic valve is connected to the water inlet and the water outlet.

2. The phase change hot water system according to claim 1, characterized in that: The water outlet heating module includes a water storage pipe shell, a water outlet pipe and a heating pipe; the water storage pipe shell is provided with a water storage cavity, the heating pipe is arranged in the water storage cavity, the water storage pipe shell is connected to the water outlet pipe and the phase change heat liner, and the water outlet pipe is connected to the water outlet.

3. The phase change hot water system according to claim 2, characterized in that: A water inlet and a water outlet are provided on the top of the water storage pipe shell, and both the water inlet and the water outlet are connected to the phase change heat transfer inner tank.

4. The phase change hot water system according to claim 1, characterized in that: The height of the water storage pipe shell is lower than the height of the phase change heat exchange inner tank.

5. The phase change hot water system according to claim 1, characterized in that: The height difference between the water storage pipe shell and the phase change heat sink is 1 cm-10 cm.

6. The phase change hot water system according to claim 1, characterized in that: The phase change heat exchange inner tank is provided with a phase change material, and the height of the phase change material is lower than the height of the water storage pipe shell.

7. The phase change hot water system according to claim 1, characterized in that: The phase change heat exchange device comprises a water inlet pipe, and the water inlet pipe is connected to the phase change heat exchange inner tank and the water inlet.

8. The phase change hot water system according to claim 1, characterized in that: The heating tube is a U-shaped heating tube.

9. A control method for a phase change hot water system, characterized in that: Applied to the phase change hot water system according to any one of claims 1 to 8, the control method comprises: determining an operating condition of the phase change hot water system; Based on the working condition of the phase change hot water system, the switch states of the water inlet and the water outlet heating module are controlled.

10. The method according to claim 9, characterized in that The working condition includes an energy storage condition and a water use condition. The control of the switch state of the water inlet and the water outlet heating module based on the working condition of the phase change hot water system includes: When the phase change hot water system is in the energy storage mode, the water inlet is closed and the water outlet heating module is turned on to heat the water stored in the water storage pipe shell by using the heating pipe and perform heat exchange with the water stored in the phase change heat transfer tank; When the phase change hot water system is in water use condition, the water inlet and the water outlet heating module are opened, so that the water outlet heating module reheats the water output from the phase change heat sink.

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