Dual-mode water heater integrating refrigeration and heat storage functions

Abstract

The application relates to the technical field of water heaters, in particular to a dual-mode water heater integrating refrigeration and heat storage functions, which comprises a compressor, an energy storage tank, a phase change material, a condenser and a heat exchanger, the condenser is connected with the heat exchanger through the phase change material, the inlet of the condenser is connected with the outlet of the compressor, the outlet of the condenser is connected with the inlet of a throttling device, the inlet of the heat exchanger is connected with a water supply pipeline, and the outlet is connected with a hot water output pipeline; a fan disc is connected with the throttling device at one end and connected with the compressor at the other end, the fan disc is provided with an air outlet and an air guide opening, the air outlet is connected with a room, and the air guide opening is connected with the outside through an air guide pipe. Compared with the prior art, the application solves the core contradiction that the traditional heat pump cannot simultaneously realize refrigeration and hot water heating through phase change heat storage and cold-heat shunting architecture.

Description

Technical Field

[0001] This application relates to the field of water heater technology, and in particular to a dual-mode water heater that integrates cooling and heat storage functions. Background Technology

[0002] Existing heat pump water heaters generally use a compressor to drive the refrigeration cycle, and release the heat of the refrigerant into the water in the storage tank through the condenser to prepare hot water. They rely on the preheated and stored hot water in the tank to meet user needs, while their cooling function requires the help of a separate refrigeration device.

[0003] However, during the operation of this type of equipment, the condensation heat generated in the cooling mode is directly discharged into the environment through the outdoor unit, while the heating mode requires the compressor to be started to heat the water stored in the water tank; and due to the time delay in the switching of refrigerant flow, the cooling and heating functions cannot operate simultaneously.

[0004] Therefore, existing equipment suffers from a double waste of energy due to the mutual incompatibility of cooling and heating modes—the condensation heat that could have been used to produce hot water during cooling is forced to be released into the atmosphere, while the user's cooling needs cannot be met during heating. Summary of the Invention

[0005] This application provides a dual-mode water heater that integrates cooling and heat storage functions to solve the technical problem of double energy waste caused by the mutual incompatibility of cooling and heating modes in existing equipment.

[0006] This application provides a dual-mode water heater integrating cooling and heat storage functions, including:

[0007] compressor;

[0008] An energy storage tank is provided, which contains a phase change material, a condenser, and a heat exchanger. The condenser and the heat exchanger are connected through the phase change material. The inlet of the condenser is connected to the outlet of the compressor, and the outlet of the condenser is connected to the inlet of the throttling device. The inlet of the heat exchanger is connected to a water supply pipeline, and the outlet is connected to a hot water output pipeline.

[0009] The fan coil unit has one end connected to the throttling device and the other end connected to the compressor. The fan coil unit is provided with an air outlet and an air guide. The air outlet is connected to the indoor unit, and the air guide is connected to the outdoor unit through an air guide pipe.

[0010] Furthermore, the fan coil unit is equipped with a stepper motor. When the water heater is in cooling mode, the stepper motor controls the air vent to close and the air outlet to open; when the water heater is in hot water mode, the stepper motor controls the air vent to open and the air outlet to close.

[0011] Furthermore, the water supply pipeline includes a cold water pipe, a hot water pipe, and a return water pipe. The inlet of the cold water pipe is connected to an external water source, and the outlet is connected to the inlet of the heat exchanger and the water-using equipment, respectively. The outlet of the hot water pipe is connected to the water-using equipment and the inlet of the return water pipe, respectively. The outlet of the return water pipe is connected to the inlet of the heat exchanger.

[0012] Furthermore, a circulation pump is provided on the return water pipe, and a one-way valve is provided at the outlet of the circulation pump, with the one-way valve located at the outlet of the return water pipe.

[0013] Furthermore, the energy storage box also includes a box body and an outer shell, the outer shell being located on the outer layer of the box body, the phase change material being filled inside the box body, and an insulation layer being provided between the outer shell and the box body.

[0014] Furthermore, the phase change temperature of the phase change material is 40℃-60℃, and the phase change material is paraffin or hydrated salt.

[0015] Furthermore, the energy storage box is also equipped with a temperature probe, the detection end of which passes through the box body and comes into contact with the phase change material.

[0016] Furthermore, the water heater also includes a controller, which is communicatively connected to the temperature probe, the fan coil unit, and the compressor.

[0017] Furthermore, the refrigerant pipeline between the compressor and the condenser has a unidirectional flow structure.

[0018] Furthermore, the outlet of the heat exchanger is also equipped with an electric heater or a gas water heater.

[0019] The technical solution provided in this application has the following advantages compared with the prior art:

[0020] This application solves the core contradiction of traditional heat pumps' inability to simultaneously achieve cooling and hot water production through a phase change thermal storage and hot / cold flow separation architecture. Its beneficial effects are as follows: In cooling mode, the waste heat generated by the condenser is efficiently absorbed and stored by the phase change material, while the fan coil continuously delivers cool air to the room; when the user activates the hot water function, the stored heat energy directly heats the flowing tap water through the heat exchanger, achieving an instant hot water supply, while the compressor maintains the cooling cycle and directs the cold air from the evaporator to the outside through the air duct, completely eliminating the temporal and spatial mutual exclusion of cooling and heating functions. This not only greatly improves the overall system efficiency (COP) and eliminates the need for a large-capacity water tank to avoid the risk of water pollution, but also achieves a comfortable experience of "compatibility with multiple functions of water heater and air conditioner". Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0024] Figure 1 A schematic diagram of the structure of a dual-mode water heater integrating cooling and heat storage functions provided in this application embodiment;

[0025] Figure 2 for Figure 1 A schematic diagram of the water supply pipeline.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Compressor; 2. Energy storage tank; 21. Phase change material; 22. Condenser; 23. Heat exchanger; 24. Outer shell; 25. Housing; 26. Insulation layer; 3. Fan coil; 31. Air outlet; 32. Air guide; 4. Water supply pipeline; 41. Cold water pipe; 42. Hot water pipe; 43. Return water pipe; 441. Circulating pump; 442. Check valve; 5. Water-using equipment; 6. Throttling device. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0030] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0031] To address the technical problem of double energy waste caused by the mutual incompatibility of cooling and heating modes in existing equipment, this application provides a dual-mode water heater that integrates cooling and heat storage functions. Through phase change heat storage and a cold and hot flow separation architecture, it solves the core contradiction that traditional heat pumps cannot simultaneously achieve cooling and hot water production.

[0032] Please see Figures 1 to 2 This application provides a dual-mode water heater integrating cooling and heat storage functions, comprising: a compressor 1; an energy storage tank 2, which contains a phase change material 21, a condenser 22, and a heat exchanger 23, the condenser 22 and the heat exchanger 23 being connected via the phase change material 21; the inlet of the condenser 22 being connected to the outlet of the compressor 1, and the outlet of the condenser 22 being connected to the inlet of a throttling device 6; the inlet of the heat exchanger 23 being connected to a water supply pipe 4, and the outlet being connected to a hot water output pipe; and a fan coil unit 3, one end of which is connected to the throttling device 6, and the other end of which is connected to the compressor 1, the fan coil unit 3 having an air outlet 31 and an air guide 32, the air outlet 31 being connected to the indoor unit, and the air guide 32 being connected to the outdoor unit via an air guide duct.

[0033] Specifically, the water heater in this embodiment provides two functional modes: cooling mode and hot water mode, which users can switch between during use. When the water heater is in cooling mode, compressor 1 starts, and the refrigerant in the system is compressed and heated into a high-temperature, high-pressure gas by compressor 1, and enters the condenser 22 in the energy storage tank 2. The refrigerant releases heat in the condenser 22 and stores the heat through the phase change material 21. After releasing heat, the refrigerant is depressurized by the throttling device 6 and becomes a low-pressure, low-temperature liquid, which then enters the fan coil 3. At this time, the air outlet 31 of the fan coil 3 is open and the air guide 32 is closed. The fan coil 3 also includes a fan and a heat exchange device. Indoor air is drawn into the air inlet of the fan coil 3 by the fan so that the indoor air exchanges heat with the heat exchange device. Then, the cooled indoor air is discharged from the air outlet 31, thereby achieving indoor cooling. Compressor 1 starts and outputs high-temperature refrigerant to the condenser 22 to heat the phase change material 21. When the water heater is in hot water mode, the refrigerant is depressurized by throttling and enters the fan coil 3. The fan coil 3 closes the air outlet 31 and opens the air guide 32. After absorbing the heat of the air, the refrigerant is discharged to the outside through the air guide duct.

[0034] Through the above methods, this embodiment achieves the following technical effects:

[0035] (1) Heat recovery and energy efficiency improvement: In the cooling mode, the waste heat of the condenser 22 is stored by the phase change material 21 and converted into hot water energy, avoiding the waste of waste heat of traditional air conditioners and significantly improving the overall energy efficiency of the system.

[0036] (2) Space optimization: Phase change material 21 has high heat storage density, which can replace traditional water tanks, greatly reduce the size of the equipment and reduce space occupation.

[0037] (3) Instant hot water supply: When cold water flows through heat exchanger 23, it directly exchanges heat with phase change material 21 to achieve instant hot water, avoiding the risk of stagnation and bacterial growth in storage water heaters.

[0038] (4) Intelligent mode switching: Through the design of dual air outlets (air outlet 31 / air guide 32) and air guide duct, the cooling and heating modes do not interfere with each other. When cooling, the air guide 32 is closed and the cooling capacity is used for cooling. When heating, the air outlet 31 is closed and the air guide 32 is opened to avoid indoor temperature fluctuations and achieve seamless function switching.

[0039] In one available embodiment, the fan coil unit 3 is equipped with a stepper motor. When the water heater is in cooling mode, the stepper motor controls the air vent 32 to close and the air outlet 31 to open; when the water heater is in hot water mode, the stepper motor controls the air vent 32 to open and the air outlet 31 to close.

[0040] Specifically, a stepper motor is fixed inside the fan coil unit 3 and connects the baffles of the air outlet 31 and the air guide 32 via a drive shaft. When the stepper motor receives a cooling mode command, it rotates counterclockwise (clockwise) by a specific angle, pushing the baffle of the air guide 32 to close completely, while simultaneously opening the baffle of the air outlet 31. When the stepper motor receives a hot water mode command, it rotates clockwise (counterclockwise) by a specific angle, pushing the baffle of the air outlet 31 to close completely, while simultaneously opening the baffle of the air guide 32. The opening and closing stroke of the baffles is precisely controlled by the stepper motor's step angle, ensuring stepless adjustment of the air outlet's open / closed state. In addition, in this embodiment, the mode switching signal (such as a user button or temperature control command) can directly drive the stepper motor to operate, without the need for additional sensors to feedback the air outlet status. The air outlet status is strictly bound to the operating mode: in cooling mode, the air guide 32 is forcibly closed, and the air outlet 31 is forcibly opened; in hot water mode, the air outlet 31 is forcibly closed, and the air guide 32 is forcibly opened. In this way, the electronic control of the fan coil unit 3 provides a foundation for intelligent linkage: it supports linkage with indoor temperature and humidity sensors to automatically fine-tune the air vent opening to optimize energy efficiency; and it allows remote commands (such as APP control) to trigger mode switching, improving the user experience.

[0041] like Figure 1-2 As shown, the water supply pipeline 4 includes a cold water pipe 41, a hot water pipe 42, and a return water pipe 43. The inlet of the cold water pipe 41 is connected to an external water source, and the outlet is connected to the inlet of the heat exchanger 23 and the water-using equipment 5, respectively. The outlet of the hot water pipe 42 is connected to the water-using equipment 5 and the inlet of the return water pipe 43, respectively. The outlet of the return water pipe 43 is connected to the inlet of the heat exchanger 23.

[0042] Specifically, the inlet of the cold water pipe 41 connects to an external water source (such as a municipal water pipe); the outlet has two branches: one directly connects to the water-using device 5 (such as the cold water inlet of a shower faucet); the other connects to the inlet of the heat exchanger 23. The inlet of the hot water pipe 42 connects to the outlet of the heat exchanger 23; the outlet has two branches: one connects to the water-using device 5 (such as the hot water inlet of a shower faucet); the other connects to the inlet of the return water pipe 43. The inlet of the return water pipe 43 connects to a branch of the outlet of the hot water pipe 42; the outlet connects to the inlet of the heat exchanger 23 (merging with a branch of the cold water pipe 41). The external water source directly supplies room-temperature cold water to the water-using device 5 or the heat exchanger 23 through the cold water pipe 41, meeting the needs for non-heated water (such as washing and cleaning) and the needs for heated water; the hot water heated by the heat exchanger 23 is transported through a dedicated hot water pipe 42 to avoid mixing with cold water and causing temperature fluctuations. The return pipe 43 guides the stagnant cold water at the end of the hot water pipe 42 back to the heat exchanger 23 for reheating, which enables users to directly output hot water when they turn on the hot water tap (without a cold water section), and reduces water temperature waiting time and water waste.

[0043] like Figure 1-2As shown, a circulation pump 441 is installed on the return water pipe 43, and a one-way valve 442 is installed at the outlet of the circulation pump 441. The one-way valve 442 is located at the outlet of the return water pipe 43.

[0044] Specifically, the circulating pump 441 is fixedly installed in the return water pipe 43, with its inlet end connected to the upstream of the return water pipe 43 (near the branch of the hot water pipe 42), and its outlet end facing the inlet of the heat exchanger 23. A one-way valve 442 is integrated at the outlet of the return water pipe 43, located downstream of the outlet of the circulating pump 441. The valve disc only allows water to flow from the circulating pump 441 to the inlet of the heat exchanger 23. The operating logic of the circulating pump 441 is as follows: Start-up condition: When the system detects that the water temperature in the hot water pipe 42 is lower than or reaches the set threshold, the circulating pump 441 starts; Water flow direction: The circulating pump 441 drives the cold water retained in the return water pipe 43 → flows through the one-way valve 442 → merges into the inlet of the heat exchanger 23 for reheating; Function of the one-way valve 442: Forces the water flow in one direction, preventing hot or cold water in the heat exchanger 23 from flowing back into the return water pipe 43. With this design, the circulating pump 441 actively draws cold water from the end of the hot water pipe 42 and accelerates the return of the cold water to the heat exchanger 23 for heating, which can ensure that the water point is hot as soon as it is turned on and completely eliminate the waiting time for water to be released.

[0045] like Figure 1 As shown, the energy storage box 2 also includes a box body 25 and an outer shell 24. The outer shell 24 is located on the outer layer of the box body 25. The phase change material 21 is filled inside the box body 25. An insulation layer 26 is provided between the outer shell 24 and the box body 25.

[0046] Specifically, the housing 25, as the core container, is made of stainless steel or corrosion-resistant aluminum alloy and directly encapsulates the phase change material 21. Its inner wall is in contact with the phase change material 21 to transfer heat. The insulation layer 26 tightly covers the outer surface of the housing 25 and fills the space between the housing 25 and the outer shell 24, forming a continuous thermal insulation barrier. The outer shell 24, as the outermost protective cover, completely covers the insulation layer 26 and physically isolates it from the external environment. The phase change material 21 is melted and poured into the interior of the housing 25, filling all gaps and solidifying. The insulation layer 26 is embedded in the space between the housing 25 and the outer shell 24 through foaming or wrapping processes, fitting seamlessly. The outer shell 24 is fixed by clips or welding, sealing the housing 25 and the insulation layer 26 inside. The insulation layer 26 blocks heat conduction / radiation from the housing 25 (phase change material 21) to the external environment, ensuring that the heat stored in the cooling mode is efficiently used for preheating the return water, and that the high-temperature heat stored in the hot water mode does not dissipate, maintaining the instant hot water supply capability.

[0047] In one available embodiment, the phase change material 21 has a phase change temperature of 40°C-60°C, and the phase change material 21 is paraffin or hydrated salt.

[0048] Specifically, paraffin wax (phase change temperature 40-55℃) or hydrated salt (phase change temperature 45-60℃) is injected into the tank 25 in a molten state, with a filling rate ≥95%, completely encapsulating the condenser 22 and heat exchanger 23. Through the solid-liquid phase change characteristics of the phase change material 21, an automatic balance between heat energy storage and release can be achieved within the 40-60℃ range. The 40-60℃ phase change temperature precisely matches the domestic hot water demand (45-55℃), avoiding the scaling problems caused by high-temperature heating (>60℃) or insufficient energy for low-temperature heat storage (<40℃) in traditional water storage tanks.

[0049] like Figure 1 As shown, the energy storage box 2 is also equipped with a temperature probe, the detection end of which passes through the box body 25 and is in contact with the phase change material 21.

[0050] Specifically, the probe's detection end is vertically inserted through a pre-drilled hole or sealing sleeve in the housing 25, with its tip directly immersed inside the phase change material 21. The probe body is fixed to the outer wall of the housing 25, and the wires are connected to an external temperature control system. The detection end is in full physical contact with the phase change material 21 without any barrier layer. Direct contact measurement avoids the lag of traditional external wall temperature measurement, accurately reflecting the solid-liquid phase change state of the phase change material 21 (40℃-60℃ range), thus ensuring automatic start-stop of waste heat storage in cooling mode when the time limit is reached, and on-demand heating in hot water mode to prevent overheating loss.

[0051] In one available embodiment, the water heater also includes a controller that is communicatively connected to the temperature probe, the fan coil unit 3, and the compressor 1.

[0052] Specifically, the controller establishes bidirectional communication with the temperature probe (which receives the temperature signal of the phase change material 21 in real time), the fan coil unit 3 (which sends air vent opening and closing commands), and the compressor 1 (which controls start and stop) via independent cables or a bus system. It receives temperature data from the temperature probe and determines whether to trigger mode switching or equipment start / stop; it outputs stepper motor action commands to the fan coil unit 3 to forcibly switch the state of the air outlet 31 / air guide vent 32; and it outputs start / stop signals to the compressor 1 to drive the cooling / heating cycle.

[0053] like Figure 1 As shown, the refrigerant pipeline between compressor 1 and condenser 22 has a unidirectional flow structure.

[0054] Specifically, the refrigerant between compressor 1 and condenser 22 is driven by compressor 1 in the forward direction. The driving direction of compressor 1 is clockwise, and only the forward refrigerant driven by the thrust of compressor 1 is allowed to pass through, while the reverse flow is blocked.

[0055] In one available embodiment, the outlet of heat exchanger 23 is also provided with an electric heater or a gas water heater.

[0056] Specifically, this embodiment adds an auxiliary heater integrated structure. An electric heater is connected in series on the hot water output pipe downstream of the heat exchanger 23 outlet, with the heating element (such as an electric heating tube) directly immersed in the water flow. A gas water heater is connected in series downstream of the heat exchanger 23 outlet, heating the water flowing through its internal heat exchange copper tubes via a burner. Users can select one heater to activate based on energy conditions, forming a series heating water circuit with the main heat exchanger 23. When the phase change material 21 has insufficient heat storage (e.g., during continuous large-scale water use), the auxiliary heater can immediately supplement the heat: the electric heater rapidly raises the water temperature (>60℃) to meet the needs of high-temperature disinfection or bathtub filling; the gas water heater provides continuous high-power heating, supporting simultaneous supply to multiple water points.

[0057] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0058] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0060] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0061] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0063] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0064] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dual-mode water heater integrating cooling and heat storage functions, characterized in that, include: compressor; An energy storage tank is provided, which contains a phase change material, a condenser, and a heat exchanger. The condenser and the heat exchanger are connected through the phase change material. The inlet of the condenser is connected to the outlet of the compressor, and the outlet of the condenser is connected to the inlet of the throttling device. The inlet of the heat exchanger is connected to a water supply pipeline, and the outlet is connected to a hot water output pipeline. The fan coil unit has one end connected to the throttling device and the other end connected to the compressor. The fan coil unit is provided with an air outlet and an air guide. The air outlet is connected to the indoor unit, and the air guide is connected to the outdoor unit through an air guide pipe.

2. The dual-mode water heater integrating cooling and heat storage functions according to claim 1, characterized in that, The fan coil unit is equipped with a stepper motor. When the water heater is in cooling mode, the stepper motor controls the air vent to close and the air outlet to open; when the water heater is in hot water mode, the stepper motor controls the air vent to open and the air outlet to close.

3. The dual-mode water heater integrating cooling and heat storage functions according to claim 1, characterized in that, The water supply pipeline includes a cold water pipe, a hot water pipe, and a return water pipe. The inlet of the cold water pipe is connected to an external water source, and the outlet is connected to the inlet of the heat exchanger and the water-using equipment, respectively. The outlet of the hot water pipe is connected to the water-using equipment and the inlet of the return water pipe, respectively. The outlet of the return water pipe is connected to the inlet of the heat exchanger.

4. The dual-mode water heater integrating cooling and heat storage functions according to claim 3, characterized in that, The return water pipe is equipped with a circulation pump, and the outlet end of the circulation pump is equipped with a one-way valve, which is located at the outlet of the return water pipe.

5. The dual-mode water heater integrating cooling and heat storage functions according to claim 1, characterized in that, The energy storage box also includes a box body and an outer shell. The outer shell is located on the outer layer of the box body, the phase change material is filled in the box body, and an insulation layer is provided between the outer shell and the box body.

6. The dual-mode water heater integrating cooling and heat storage functions according to claim 5, characterized in that, The phase change material has a phase change temperature of 40℃-60℃, and the phase change material is paraffin or hydrated salt.

7. The dual-mode water heater integrating cooling and heat storage functions according to claim 6, characterized in that, The energy storage box is also equipped with a temperature probe, the detection end of which passes through the box body and is in contact with the phase change material.

8. The dual-mode water heater integrating cooling and heat storage functions according to claim 7, characterized in that, It also includes a controller, which is communicatively connected to the temperature probe, the fan coil unit, and the compressor.

9. The dual-mode water heater integrating cooling and heat storage functions according to claim 1, characterized in that, The refrigerant pipeline between the compressor and the condenser has a unidirectional flow structure.

10. The dual-mode water heater integrating cooling and heat storage functions according to claim 1, characterized in that, The outlet of the heat exchanger is also equipped with an electric heater or a gas water heater.

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