Heat pump system and control method and control device thereof

Abstract

The invention provides a heat pump system and a control method and device thereof. The hot water system comprises a heat pump loop, the heat pump loop comprises a first intermediate heat exchanger and an outdoor heat exchanger which are connected through a refrigerant pipeline, and the first intermediate heat exchanger heats the heating hot water loop through the refrigerant pipeline to generate hot water; the heating hot water loop comprises a heating pipeline, heating equipment and a second intermediate heat exchanger, the heating equipment and the second intermediate heat exchanger are connected in parallel, the heating pipeline flows through the water side of the first intermediate heat exchanger for heat exchange, and the water side of the first intermediate heat exchanger is selectively connected with the heating equipment or the second intermediate heat exchanger; domestic hot water flows through the second intermediate heat exchanger to exchange heat with the heating pipeline. According to the heat pump system and the control method and device thereof, heat distribution can be dynamically adjusted according to data monitored in real time, so that the heat exchanger is prevented from being frozen, heat resources in the system are utilized to the maximum extent, and the energy efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to a heat pump system and a control method and a control device thereof. Background Art

[0002] In related technologies, when a thermal storage heat pump water heater is used, during low-temperature heating and defrosting, or when the evaporating temperature is relatively low in cooling mode, the primary water side of the heat exchanger can freeze due to heat exchange. In severe cases, this can cause deformation or even structural damage to the water side piping of the heat exchanger. For example, when the system is heating in a low-temperature environment and needs to be defrosted after a certain period of operation, the intermediate heat exchanger acts as the evaporator. Due to the low temperature and low pressure protection temperature of the refrigerant on the evaporation side, there is a risk of ice forming on the water side of the intermediate heat exchanger. Summary of the Invention

[0003] The present invention provides a heat pump system and its control method and control device, which are used to address the defects existing in the prior art and achieve the following technical effects: dynamically adjust heat distribution according to real-time monitoring data to prevent the first intermediate heat exchanger from freezing, while maximizing the use of heat resources within the system and improving energy efficiency.

[0004] A hot water system according to an embodiment of the first aspect of the present invention includes:

[0005] A heat pump circuit includes a first intermediate heat exchanger and an outdoor heat exchanger connected by a refrigerant pipe, wherein the first intermediate heat exchanger heats a heating hot water circuit through the refrigerant pipe;

[0006] A heating hot water circuit, comprising a heating pipe, a heating device, and a second intermediate heat exchanger, wherein the heating pipe flows through the water side of the first intermediate heat exchanger to exchange heat with the refrigerant pipe, the heating device and the second intermediate heat exchanger are connected in parallel, and the water side of the first intermediate heat exchanger can be selectively connected to the heating device or the second intermediate heat exchanger;

[0007] Wherein, domestic hot water flows through the second intermediate heat exchanger to exchange heat with the heating pipe.

[0008] According to one embodiment of the present invention, an electric three-way valve is provided in the heating pipe, the inlet of the electric three-way valve is connected to the water side of the first intermediate heat exchanger, and the two outlets of the electric three-way valve are respectively connected to the heating equipment and the second intermediate heat exchanger.

[0009] According to one embodiment of the present invention, the heating pipe is further provided with an electric auxiliary heating device.

[0010] According to one embodiment of the present invention, a heating water pump is provided on the heating pipe, and the heating water pump is connected in series with the water side of the first intermediate heat exchanger.

[0011] According to one embodiment of the present invention, a water tank is further included. The water tank is connected to a water tank pipe. The water tank pipe is used to provide domestic water to the second intermediate heat exchanger, and a water tank water pump is provided on the water tank pipe.

[0012] According to a second embodiment of the present invention, a method for controlling a hot water system based on the first embodiment of the present invention includes:

[0013] receiving a signal for controlling the hot water system to enter a defrost mode, and obtaining hot water information in the first intermediate heat exchanger;

[0014] determining whether there is a risk of freezing on the water side of the first intermediate heat exchanger based on the hot water information;

[0015] If it is determined that the water side of the first intermediate heat exchanger is at risk of freezing, the heating hot water temperature of the heating equipment and the inlet hot water temperature of domestic water when entering the second intermediate heat exchanger are obtained;

[0016] According to the heating hot water temperature and the inlet hot water temperature, one of the heating device and the second intermediate heat exchanger is controlled and adjusted to be connected in series to the water side of the first intermediate heat exchanger.

[0017] According to one embodiment of the present invention, the hot water information includes the water flow rate change rate and / or the water outlet temperature in the first intermediate heat exchanger;

[0018] The step of determining whether the water side of the first intermediate heat exchanger has a risk of freezing damage based on the hot water information specifically includes:

[0019] When the water flow rate change rate is greater than or equal to a preset maximum rate of change, or the water outlet temperature is less than or equal to a preset minimum temperature, it is determined that the water side of the first intermediate heat exchanger is at risk of freezing.

[0020] According to one embodiment of the present invention, the hot water information includes the water flow rate change rate and / or the water outlet temperature in the first intermediate heat exchanger;

[0021] The step of determining whether the water side of the first intermediate heat exchanger has a risk of freezing damage based on the hot water information specifically includes:

[0022] When the water flow rate change rate is less than a preset maximum rate of change, or the outlet water temperature is greater than a preset minimum temperature and lasts for at least a preset time, it is determined that there is no risk of freezing damage on the water side of the first intermediate heat exchanger.

[0023] According to one embodiment of the present invention, the step of controlling and adjusting one of the heating equipment and the second intermediate heat exchanger connected in series to the water side of the first intermediate heat exchanger according to the heating hot water temperature and the inlet hot water temperature specifically includes:

[0024] According to the comparison result of the heating hot water temperature and the inlet hot water temperature and the range in which they are located, the valve direction of the electric three-way valve, the switch of the electric auxiliary heating device, and the switch of the heating water pump and the water tank pump are controlled and adjusted.

[0025] According to one embodiment of the present invention, the step of controlling and adjusting the valve direction of the electric three-way valve, the switch of the electric auxiliary heating device, and the switch of the heating water pump and the water tank pump based on the comparison result of the heating hot water temperature and the inlet hot water temperature and the range in which they are located specifically includes:

[0026] When the heating temperature and the water tank temperature are both less than or equal to the preset minimum temperature, the electric three-way valve is controlled to connect to the second intermediate heat exchanger, and the electric auxiliary heating device is controlled to be turned on, the water tank pump is turned off, and the heating water pump is controlled to be turned on.

[0027] According to one embodiment of the present invention, the step of controlling and adjusting the valve direction of the electric three-way valve, the switch of the electric auxiliary heating device, and the switch of the heating water pump and the water tank pump based on the comparison result of the heating hot water temperature and the inlet hot water temperature and the range in which they are located specifically includes:

[0028] When the heating temperature is less than or equal to the water tank temperature and the water tank temperature is greater than the preset minimum temperature, the electric three-way valve is controlled to connect to the second intermediate heat exchanger, and the electric auxiliary heating device is controlled to be closed, the water tank water pump is turned on, and the heating water pump is turned on.

[0029] According to one embodiment of the present invention, the step of controlling and adjusting the valve direction of the electric three-way valve, the switch of the electric auxiliary heating device, and the switch of the heating water pump and the water tank pump based on the comparison result of the heating hot water temperature and the inlet hot water temperature and the range in which they are located specifically includes:

[0030] When the heating temperature is greater than the water tank temperature and the heating temperature is greater than the preset minimum temperature, the electric three-way valve is controlled to be connected to the heating equipment, and the electric auxiliary heating device is controlled to be closed, the water tank water pump is closed, and the heating water pump is turned on.

[0031] According to a third aspect of the present invention, a control device for a hot water system based on the first aspect of the present invention includes:

[0032] a first acquisition module, configured to receive a signal for controlling the hot water system to enter a defrost mode, and acquire hot water information in the first intermediate heat exchanger;

[0033] a first control module, configured to determine whether the water side of the first intermediate heat exchanger has a risk of freezing damage based on the hot water information;

[0034] a second acquisition module, configured to determine that the water side of the first intermediate heat exchanger has a risk of freezing, and then acquire the heating hot water temperature of the heating equipment and the inlet hot water temperature of domestic water when entering the second intermediate heat exchanger;

[0035] The second control module is used to control and adjust one of the heating equipment and the second intermediate heat exchanger to be connected in series to the water side of the first intermediate heat exchanger according to the heating hot water temperature and the inlet hot water temperature.

[0036] The hot water system of the present invention can dynamically adjust heat distribution according to real-time monitoring data through intelligent control to prevent freezing of the water side of the first intermediate heat exchanger, while maximizing the use of heat resources within the system to improve energy efficiency.

[0037] The control method of the hot water system of the present invention has the following technical effects: (1) Real-time detection and prevention: The system can detect changes in parameters such as water flow, outlet water temperature, heating equipment temperature and water tank temperature in real time, thereby detecting and preventing the freezing of the system in advance. (2) Internal heat generation: The present invention uses the heat energy generated inside the system to prevent freezing, rather than relying on high-power consumption components such as external electric heating, which can save costs and improve energy efficiency. (3) Intelligent control: The system automatically adjusts the operating strategy according to the detected parameter changes, such as turning on or off the electric auxiliary heating, adjusting the flow direction of the electric three-way valve and controlling the operation of the water pump to adapt to different freezing risk situations. (4) Flexibility and adaptability: The defrosting method of the present invention can automatically adjust according to different temperature conditions and system states to ensure that freezing can be effectively prevented in various environments, thereby improving the stability and reliability of the system. (5) Cost-effectiveness: By optimizing the defrosting process, the dependence on external heat sources is reduced, the system operating costs are reduced, and the overall energy efficiency is improved. (6) Protection mechanism: Preventive measures are taken before the freezing risk occurs to protect the heat exchanger from being damaged, ensure that the system can operate normally, and thus extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1It is a structural diagram of a heating hot water circuit of a hot water system provided by the present invention;

[0040] Figure 2 It is a structural schematic diagram of the heat pump circuit of the hot water system provided by the present invention;

[0041] Figure 3 1 is a schematic diagram of the steps of the hot water system control method provided by the present invention;

[0042] Figure 4 It is a structural schematic diagram of the control device of the hot water system provided by the present invention;

[0043] Figure 5 It is a structural schematic diagram of the electronic device provided by the present invention.

[0044] Reference numerals:

[0045] 1. Flow meter; 2. Electric auxiliary heating device; 3. Expansion valve; 4. Electric three-way valve; 5. Water pressure gauge; 6. Magnetic filter; 7. Heating water pump; 8. Domestic water tank; 9. Water tank drain outlet; 10. Water tank temperature sensor; 11. Second intermediate heat exchanger; 12. Water tank water pump; 13. Safety valve; 14. Exhaust valve; 15. Drain outlet; 16. Heating temperature sensor; 17. Heating equipment; 18. Outdoor heat exchanger; 19. Throttling device; 20. Liquid storage tank; 21. First intermediate heat exchanger; 22. Heating pipe; 23. Gas-liquid separator; 24. Compressor; 25. Four-way valve; 110. First acquisition module; 120. First control module; 130. Second acquisition module; 140. Second control module. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0047] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of 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 operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0048] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0049] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0050] The following describes a hot water system, a control method for a hot water system, and a control device thereof proposed by the present invention with reference to the accompanying drawings. It should be noted that the control method for the hot water system of the second embodiment of the present invention and the control device for the hot water system of the third embodiment of the present invention are both implemented based on the structural basis of the hot water system of the first embodiment of the present invention.

[0051] like Figure 1 and Figure 2 As shown, the hot water system according to the first embodiment of the present invention includes a heat pump circuit, a heating hot water circuit and a domestic water tank 8.

[0052] Among them, the heat pump circuit includes a compressor 24, a four-way valve 25, a first intermediate heat exchanger 21 and an outdoor heat exchanger 18 connected through a refrigerant pipe. The first intermediate heat exchanger 21 heats the heating hot water circuit through the refrigerant pipe to generate hot water in the heating hot water circuit.

[0053] The heating hot water circuit includes a heating pipe 22 and a heating device 17 and a second intermediate heat exchanger 11 connected in parallel. The heating pipe 22 flows through the first intermediate heat exchanger 21 to exchange heat with the refrigerant pipe. Part of the heating pipe 22 in the first intermediate heat exchanger 21 can be selectively connected in series with the heating device 17 or the second intermediate heat exchanger 11. It can be understood that the first intermediate heat exchanger 21 is divided into a refrigerant side and a water side. The refrigerant side of the first intermediate heat exchanger 21 contains part of the refrigerant pipe in the heat pump circuit, while the water side of the first intermediate heat exchanger 21 contains part of the heating pipe 22 in the heating hot water circuit. In heating mode, the first intermediate heat exchanger 21 acts as a condenser. At this time, the refrigerant pipe inside the first intermediate heat exchanger 21 heats the heating pipe 22, generating hot water in the heating hot water circuit.

[0054] Domestic water flows through the second intermediate heat exchanger 11 to exchange heat with the heating pipe 22, wherein the domestic water can be obtained by setting up a domestic water tank 8. Specifically, the domestic water tank 8 is connected to a water tank pipe, and the hot water in the water tank pipe flows through the second intermediate heat exchanger 11 to exchange heat with the heating pipe 22.

[0055] According to the hot water system of the embodiment of the present invention, its specific working principle is as follows: when the hot water system is in a low temperature environment for heating, it needs to be defrosted after running for a certain period of time. At this time, the first intermediate heat exchanger 21 serves as an evaporator. Since the low temperature and low pressure protection temperature of the refrigerant on the evaporation side is very low, part of the heating pipe 22 in the first intermediate heat exchanger 21 (that is, the water side of the first intermediate heat exchanger 21) will have the risk of freezing. Therefore, in the defrost mode, when it is detected that the water side of the first intermediate heat exchanger 21 has the risk of freezing, the heating hot water circuit can be the first intermediate heat exchanger 21. Hot water is provided on the water side of the heat exchanger 21 to help it achieve defrosting. Specifically, since part of the heating pipes 22 in the first intermediate heat exchanger 21 can be selectively connected in series with the heating equipment 17 or the second intermediate heat exchanger 11, during the defrosting process, the system can control the hot water in the heating equipment 17 to flow through the water side of the first intermediate heat exchanger 21 to heat it for defrosting, or the system can control the second intermediate heat exchanger 11 to absorb the heat of the hot water in the domestic water tank 8 and transfer the heat to the water side of the first intermediate heat exchanger 21 through the hot water pipe to achieve heating and defrosting.

[0056] The hot water system operates as follows: The system monitors the temperature and humidity on the water side of the first intermediate heat exchanger 21 through sensors. When a risk of freezing is detected, the system initiates a defrost procedure. In defrost mode, the system can select one of two methods to provide hot water to the water side of the first intermediate heat exchanger 21 to aid defrosting. The first method involves using the heating device 17 to assist in defrosting. The system can control the hot water in the heating device 17 to flow through the water side of the first intermediate heat exchanger 21, using the heat from the heating device 17 to heat the water side of the first intermediate heat exchanger 21, thereby melting frost. The second method involves using the second intermediate heat exchanger 11 to assist in defrosting. The system can control the second intermediate heat exchanger 11 to absorb heat from the hot water in the domestic water tank 8 and then transfer this heat to the water side of the first intermediate heat exchanger 21 via a hot water pipe, achieving heating and defrosting. Through both defrost methods, whether using the heating device 17 or the second intermediate heat exchanger 11, the system ensures that hot water flows through the water side of the first intermediate heat exchanger 21, providing sufficient heat to melt frost.

[0057] When the frost is cleared, the system detects that the temperature on the water side of the first intermediate heat exchanger 21 has returned to normal, and the system stops supplying hot water to the water side of the first intermediate heat exchanger 21. After the defrost process is completed, the system returns to normal heating and hot water supply mode, continuing to provide indoor heating and domestic hot water through the heat pump circuit.

[0058] This design allows the system to flexibly adapt to varying environmental conditions, ensuring that even in cold weather, frost does not affect the heat exchange efficiency of the water side of the first intermediate heat exchanger 21. In this way, the system not only provides a comfortable indoor environment but also maintains energy efficiency and reduces energy consumption.

[0059] In related technologies, when using a thermal storage heat pump water heater, if it encounters low-temperature heating and defrosting or a relatively low evaporation temperature in cooling mode, the primary water side of the heat exchanger may freeze due to heat exchange. In severe cases, this may cause deformation of the water side piping of the heat exchanger or even structural damage. For example, when the system is heating in a low-temperature environment, it needs to be defrosted after running for a certain period of time. At this time, the intermediate heat exchanger acts as the evaporator. Since the low-temperature and low-pressure protection temperature of the refrigerant on the evaporation side is very low, there is a risk of freezing on the water side of the intermediate heat exchanger.

[0060] Therefore, to address the technical deficiencies in the aforementioned related art, the present invention provides a hot water system. This system selectively connects the water side of a first intermediate heat exchanger 21 in series with either a heating device 17 or a second intermediate heat exchanger 11. This allows the water side of the first intermediate heat exchanger 21 to be defrosted using either the heating device 17 or the second intermediate heat exchanger 11. This system flexibly accommodates varying environmental conditions and ensures that frost does not affect the heat exchange efficiency of the water side of the first intermediate heat exchanger 21 during cold weather. In this way, the system not only provides a comfortable indoor environment but also maintains energy efficiency and reduces energy consumption.

[0061] like Figure 1 As shown, according to some embodiments of the present invention, an electric three-way valve 4 is provided in the heating pipe 22, the inlet of the electric three-way valve 4 is connected to part of the heating pipe 22 in the first intermediate heat exchanger 21 (that is, the water side of the first intermediate heat exchanger 21), and the two outlets of the electric three-way valve 4 are respectively connected to the heating equipment 17 and the second intermediate heat exchanger 11.

[0062] In this way, the system can control and adjust the valve direction of the electric three-way valve 4 to select whether the water side of the first intermediate heat exchanger 21 is connected to one of the heating equipment 17 and the second intermediate heat exchanger 11, and then select different auxiliary defrosting methods (such as auxiliary defrosting of the heating equipment 17 and auxiliary defrosting of the second intermediate heat exchanger 11) to defrost the outdoor heat exchange. The operation is simple and convenient and the structure is simpler.

[0063] like Figure 1 As shown, according to some embodiments of the present invention, an electric auxiliary heating device 2 is further provided on the heating pipe 22. Thus, in defrost mode, if the risk of freezing on the water side of the first intermediate heat exchanger 21 is high and the heat from the heating equipment 17 and the domestic water tank 8 cannot meet the defrosting requirements, the electric auxiliary heating device 2 can be activated to provide sufficient heat for the defrosting process on the water side of the first intermediate heat exchanger 21, ensuring complete defrosting of the water side of the first intermediate heat exchanger 21. For example, the electric auxiliary heating device 2 can be an electric heating pipe, a solar heating device, etc., and the present invention does not impose any particular limitations thereon.

[0064] like Figure 1 As shown, according to some embodiments of the present invention, a heating water pump 7 is provided on the heating pipe 22, and the heating water pump 7 is connected in series with part of the refrigerant pipe in the first intermediate heat exchanger 21 (that is, the water side of the first intermediate heat exchanger 21).

[0065] According to some embodiments of the present invention, a water tank pump 12 is provided on the water tank pipeline.

[0066] A specific embodiment of the hot water system of the present invention will be described below with reference to the accompanying drawings.

[0067] like Figure 1 and Figure 2 As shown, the hot water system mainly includes two circuit parts, one circuit is a heat pump circuit, whose main purpose is to heat and produce hot water, and the other circuit is a heating hot water circuit, whose main purpose is to use the heating equipment 17 to heat and assist in heating the water side of the first intermediate heat exchanger 21 to achieve defrosting.

[0068] like Figure 2 As shown, the heat pump system includes an outdoor heat exchanger 18, a throttling component, a first intermediate heat exchanger 21, a compressor 24, a four-way valve 25, and a gas-liquid separator 23 connected through a refrigerant pipeline. The four interfaces of the four-way valve 25 are respectively connected to the exhaust port of the compressor 24, the liquid inlet of the gas-liquid separator 23, the outdoor heat exchanger 18, and the refrigerant side of the first intermediate heat exchanger 21. The throttling component is arranged between the outdoor heat exchanger 18 and the refrigerant side of the first intermediate heat exchanger 21. A liquid reservoir for storing refrigerant is also provided on the refrigerant pipeline. In addition, heat is exchanged between the refrigerant and water in the first intermediate heat exchanger 21. The water in the heating hot water circuit flows through the water side of the first intermediate heat exchanger 21 and is heated by the refrigerant pipeline. Finally, it is heated into hot water and flows into the subsequent heating equipment 17.

[0069] like Figure 1 As shown, the heating hot water circuit includes a heating pipe 22, a parallel-connected heating device 17 and a second intermediate heat exchanger 11, a heating water pump 7, and an electric three-way valve 4. The heating device 17 is provided with a heating temperature sensor 16 (for detecting the temperature of the heating device 17). The heating pipe 22 flows through the water side of the first intermediate heat exchanger 21 to exchange heat with the refrigerant pipe. The inlet of the electric three-way valve 4 is connected to the water side of the first intermediate heat exchanger 21, and the two outlets of the electric three-way valve 4 are respectively connected to the heating device 17 and the second intermediate heat exchanger 11. The heating pipe 22 is connected to the heating device through the heating device water inlet and the heating device water outlet. In addition, an electric auxiliary heating device 2, a flow meter 1, and an expansion tank are also provided on the heating pipe 22 between the water side of the first intermediate heat exchanger 21 and the inlet of the electric three-way valve 4. The heating pipe 22 is further provided with a safety valve 13 , an exhaust valve 14 and two sewage outlets 15 . A magnetic filter 6 for filtering impurities in water is also provided at the inlet on the water side of the first intermediate heat exchanger 21 .

[0070] The domestic water tank 8 is provided with a water tank pipe, which flows through the second intermediate heat exchanger 11 and exchanges heat with the heating pipe 22. The water tank pipe is also provided with a water tank pump 12. In addition, the domestic water tank 8 is also provided with a water tank inlet and a water tank outlet, and the outer wall of the water tank is also provided with a water tank sewage outlet 159 and a water tank temperature sensor 10 (for detecting the water tank temperature).

[0071] The following describes the control method, control device and hot water system of the hot water system proposed by the present invention with reference to the accompanying drawings. Before describing the embodiments of the present invention in detail, the entire application scenario is described first. The control method, control device, electronic device and computer-readable storage medium of the hot water system of the embodiment of the present invention can be applied to the hot water system locally, or to the cloud platform in the Internet field, or other types of cloud platforms in the Internet field, or can also be applied to third-party devices. Among them, the third-party device may include a variety of different types such as mobile phones, tablet computers, notebooks, car computers and other smart terminals.

[0072] The following description only takes the control method applicable to a hot water system as an example. It should be understood that the control method of the embodiment of the present invention can also be applied to a cloud platform and third-party equipment.

[0073] It should also be noted that the control method for the hot water system proposed in the present invention is universal, that is, the method is applicable to both cooling and heating of the hot water system in a low-temperature environment or a high-temperature environment. For the convenience of description, the following will be explained using the example of heating of the hot water system in a low-temperature environment.

[0074] like Figure 3 As shown, according to the second embodiment of the present invention, the control method of the hot water system based on the first embodiment of the present invention includes:

[0075] Step S1, receiving a signal for controlling the hot water system to enter a defrost mode, and obtaining hot water information in the first intermediate heat exchanger 21;

[0076] Step S2: judging whether the water side of the first intermediate heat exchanger 21 is at risk of freezing based on the hot water information;

[0077] Step S3: If it is determined that the water side of the first intermediate heat exchanger 21 is at risk of freezing, the heating hot water temperature of the heating equipment 17 and the inlet hot water temperature of the domestic water when entering the second intermediate heat exchanger 11 (i.e., the water tank temperature in the domestic water tank) are obtained;

[0078] Step S4 , according to the heating hot water temperature and the inlet hot water temperature, controlling and adjusting the heating device 17 and one of the second intermediate heat exchanger 11 to be connected in series to the water side of the first intermediate heat exchanger 21 .

[0079] According to the control method of the hot water system of an embodiment of the present invention, its specific working process is as follows: First, in step S1, the system receives a defrost signal, that is, when the system detects that the outdoor ambient temperature is so low that it may cause the water side of the first intermediate heat exchanger 21 to freeze, it will receive a control signal to instruct the system to enter the defrost mode. Subsequently, in step S2, the system will monitor the hot water status in the first intermediate heat exchanger 21, including but not limited to the temperature and flow of the hot water. It can be understood that the above hot water information can evaluate the freezing risk of the water side of the first intermediate heat exchanger 21. Furthermore, after obtaining the above hot water information, the system determines whether there is a risk of freezing on the water side of the first intermediate heat exchanger 21 based on the collected hot water information, such as the temperature being lower than a certain threshold. When the hot water temperature is too low, it may cause the surface of the water side of the first intermediate heat exchanger 21 to freeze.

[0080] The system then obtains the heating hot water and inlet hot water temperatures in step S3. Specifically, if the system determines that there is a risk of freezing on the water side of the first intermediate heat exchanger 21, it further obtains the heating hot water temperature of the heating equipment 17 and the hot water temperature in the domestic water tank 8. This temperature data can be used to determine how to distribute excess heat within the heating hot water circuit to prevent freezing on the water side of the first intermediate heat exchanger 21.

[0081] Finally, the system determines whether to use the heating device 17 or the second intermediate heat exchanger 11 to provide heat to the water side of the first intermediate heat exchanger 21 based on the heating hot water temperature and the inlet hot water temperature. The system selects the higher-temperature heat source, either the heating device 17 or the second intermediate heat exchanger 11 (i.e., the domestic water tank 8), to provide heat to more effectively melt the frost on the water side of the first intermediate heat exchanger 21. During the defrost process, the system continuously monitors the temperature and water flow on the water side of the first intermediate heat exchanger 21 to ensure the effectiveness of the defrost operation. Once the frost is cleared, the system stops supplying hot water to the water side of the first intermediate heat exchanger 21 and resumes normal operation.

[0082] For example, if the hot water temperature of the heating device 17 is relatively high, the system may choose to connect the heating device 17 in series with the water side of the first intermediate heat exchanger 21, and use the heat in the heating device 17 for defrosting. For another example, if the hot water temperature in the domestic water tank 8 is relatively high, the system may choose to connect the second intermediate heat exchanger 11 in series with the water side of the first intermediate heat exchanger 21, and use the heat in the water tank for defrosting.

[0083] It should be noted that once the appropriate heat source is selected, the system adjusts the corresponding valves and pumps to allow hot water to flow through the water side of the first intermediate heat exchanger 21, transferring heat to melt frost. For example, if the heating pipe 22 is equipped with an electric three-way valve 4, the above process will involve switching the electric three-way valve 4 to ensure that the hot water flows along the correct path.

[0084] In this way, the control method of the hot water system of the present invention can dynamically adjust the heat distribution according to the real-time monitoring data through intelligent control to prevent the water side of the first intermediate heat exchanger 21 from freezing, while maximizing the use of the heat resources within the system and improving energy efficiency.

[0085] In summary, the control method of the hot water system according to the embodiment of the present invention has the following technical effects: (1) Real-time detection and prevention: The system can detect changes in parameters such as water flow, outlet water temperature, heating equipment 17 temperature and water tank temperature in real time, thereby detecting and preventing the freezing of the system in advance. (2) Internal heat generation: The present invention uses the heat energy generated inside the system to prevent freezing, rather than relying on high-power consumption components such as external electric heating, which can save costs and improve energy efficiency. (3) Intelligent control: The system automatically adjusts the operating strategy according to the detected parameter changes, such as turning on or off the electric auxiliary heating, adjusting the flow direction of the electric three-way valve 4 and controlling the operation of the water pump to adapt to different freezing risk situations. (4) Flexibility and adaptability: The defrosting method of the present invention can automatically adjust according to different temperature conditions and system states to ensure that freezing can be effectively prevented in various environments, thereby improving the stability and reliability of the system. (5) Cost-effectiveness: By optimizing the defrosting process, the dependence on external heat sources is reduced, the system operating costs are reduced, and the overall energy efficiency is improved. (6) Protection mechanism: Take preventive measures before the risk of freezing occurs to protect the heat exchanger from being damaged, ensure the normal operation of the system, and thus extend the service life of the equipment.

[0086] According to some embodiments of the present invention, the hot water information includes the water flow rate change rate and / or the water outlet temperature in the first intermediate heat exchanger 21. The step of determining whether there is a risk of freezing on the water side of the first intermediate heat exchanger 21 based on the hot water information specifically includes:

[0087] When the water flow rate change rate is greater than or equal to the preset maximum change rate, or the water outlet temperature is less than or equal to the preset minimum temperature, it is determined that the water side of the first intermediate heat exchanger 21 is at risk of freezing;

[0088] When the water flow rate change rate is less than the preset maximum rate of change, or the water outlet temperature is greater than the preset minimum temperature and lasts for at least a preset time, it is determined that there is no risk of freezing on the water side of the first intermediate heat exchanger 21.

[0089] In this embodiment, the system monitors the water flow rate change rate in the first intermediate heat exchanger 21 in real time. The water flow rate change rate refers to the amount of change in water flow per unit time. If the monitored water flow rate change rate is greater than or equal to the preset maximum change rate (A), this may indicate that the heat exchange effect on the water side of the first intermediate heat exchanger 21 has decreased, and there is a risk of freezing. In addition, the system also monitors the outlet water temperature (Two) of the first intermediate heat exchanger 21. If the outlet water temperature is less than or equal to the preset minimum temperature threshold (B), this may mean that the temperature on the water side of the first intermediate heat exchanger 21 is too low, and there is a risk of freezing.

[0090] As you can understand, the above judgment logic is based on the physical principles of how changes in water flow and temperature affect heat exchanger performance. Significant fluctuations in water flow can lead to unstable flow rates within the heat exchanger, affecting heat exchange efficiency; while excessively low outlet water temperature directly reflects a decrease in the heat exchanger's ability to absorb heat. By monitoring these parameters, the system can promptly identify and address the risk of freezing on the water side of the first intermediate heat exchanger 21, thereby protecting the equipment from damage.

[0091] According to some embodiments of the present invention, the step of controlling and adjusting one of the heating device 17 and the second intermediate heat exchanger 11 to be connected in series to the water side of the first intermediate heat exchanger 21 according to the heating hot water temperature and the inlet hot water temperature specifically includes:

[0092] According to the comparison result of the heating hot water temperature and the inlet hot water temperature and the range in which they are located, the valve direction of the electric three-way valve 4, the switch of the electric auxiliary heating device 2, and the switch of the heating water pump 7 and the water tank water pump 12 are controlled and adjusted.

[0093] In this embodiment, when the comparison results of the heating hot water temperature and the inlet hot water temperature and the ranges in which they are located are different, the auxiliary defrosting method adopted by the system for the water side of the first intermediate heat exchanger 21 will be different. By controlling the valve direction of the electric three-way valve 4, the switch of the electric auxiliary heating device 2, and the switch of the heating water pump 7 and the water tank water pump 12, the auxiliary defrosting method can be switched, thereby specifically performing auxiliary defrosting on the water side of the first intermediate heat exchanger 21 to ensure its defrosting effect.

[0094] In a specific embodiment of the present invention, the steps of controlling and adjusting the valve direction of the electric three-way valve 4, the switch of the electric auxiliary heating device 2, and the switch of the heating water pump 7 and the water tank water pump 12 according to the comparison result of the heating hot water temperature and the inlet hot water temperature and the range in which they are located, specifically include:

[0095] When the heating temperature and the water tank temperature are both less than or equal to the preset minimum temperature, the electric three-way valve 4 is controlled to connect to the second intermediate heat exchanger 11, and the electric auxiliary heating device 2 is controlled to be turned on, the water tank pump 12 is turned off, and the heating water pump 7 is turned on.

[0096] In this embodiment, when both the heating hot water temperature (T17) and the inlet hot water temperature (T8) are less than or equal to the preset minimum temperature threshold (B), the system takes the following control measures to mitigate the risk of freezing on the water side of the first intermediate heat exchanger 21: First, the system controls the electric three-way valve 4 to connect it to the second intermediate heat exchanger 11. This allows hot water from the heating device 17 to flow through the second intermediate heat exchanger 11 and transfer heat to the water side of the first intermediate heat exchanger 21, helping to defrost it. Second, the system activates the electric auxiliary heating device 2. In this case, since neither the heating device 17 nor the hot water in the water tank is hot enough to provide sufficient heat, the electric auxiliary heating device 2 provides additional heat to assist in defrosting. Third, the system shuts down the water tank pump 12 because the water in the water tank is not hot enough to provide sufficient heat, eliminating the need to transfer water from the tank to the water side of the first intermediate heat exchanger 21. At the same time, the system will start the heating water pump 7 to ensure that the hot water in the heating equipment 17 can flow through the second intermediate heat exchanger 11 and transfer heat to the water side of the first intermediate heat exchanger 21.

[0097] In this way, through the above control measures, the system can effectively utilize the heat provided by the electric auxiliary heating device 2 when the temperatures of the heating hot water and the inlet hot water are both low, and transfer the heat to the water side of the first intermediate heat exchanger 21 through the second intermediate heat exchanger 11, thereby achieving defrosting.

[0098] In another specific embodiment of the present invention, the steps of controlling the valve direction of the electric three-way valve 4, the switch of the electric auxiliary heating device 2, and the switch of the heating water pump 7 and the water tank water pump 12 according to the comparison result of the heating hot water temperature and the inlet hot water temperature and the range in which they are located, specifically include:

[0099] When the heating temperature is less than or equal to the water tank temperature and the water tank temperature is greater than the preset minimum temperature, the electric three-way valve 4 is controlled to connect to the second intermediate heat exchanger 11, and the electric auxiliary heating device 2 is controlled to be closed, the water tank water pump 12 is turned on, and the heating water pump 7 is turned on.

[0100] In this embodiment, when the heating hot water temperature (T17) is less than or equal to the inlet hot water temperature (T8), and the inlet hot water temperature (T8) is greater than the preset minimum temperature threshold (B), the system performs the following control operations: First, the system controls the electric three-way valve 4 to connect it to the second intermediate heat exchanger 11. This allows the hot water in the water tank to flow through the second intermediate heat exchanger 11, transferring heat to the water side of the first intermediate heat exchanger 21, helping to defrost it. Second, because the hot water in the water tank is already sufficiently hot, the system shuts down the electric auxiliary heating device 2. At this point, the additional heat provided by the electric auxiliary heating device 2 is no longer necessary, thereby saving energy. Third, the system turns on the water tank pump 12 and the heating water pump 7 to ensure that the hot water in the water tank can flow to the second intermediate heat exchanger 11, thereby transferring heat to the water side of the first intermediate heat exchanger 21.

[0101] In this way, through the above control measures, the system can effectively utilize the hot water resources in the water tank without relying on the electric auxiliary heating device 2, thereby reducing energy consumption while maintaining the system operation efficiency.

[0102] In another specific embodiment of the present invention, the steps of controlling and adjusting the valve direction of the electric three-way valve 4, the switch of the electric auxiliary heating device 2, and the switch of the heating water pump 7 and the water tank water pump 12 according to the comparison result of the heating hot water temperature and the inlet hot water temperature and the range in which they are located, specifically include:

[0103] When the heating temperature is greater than the water tank temperature and the heating temperature is greater than the preset minimum temperature, the electric three-way valve 4 is controlled to be connected to the heating equipment 17, and the electric auxiliary heating device 2 is controlled to be closed, the water tank water pump 12 is closed, and the heating water pump 7 is controlled to be turned on.

[0104] In this embodiment, when the heating hot water temperature (T17) is greater than the inlet hot water temperature (T8) and greater than the preset minimum temperature threshold (B), the system performs the following control operations: First, the system controls the electric three-way valve 4 to connect it to the heating device 17. This allows the hot water in the heating device 17 to flow directly through the water side of the first intermediate heat exchanger 21, transferring heat to assist in defrosting. Second, because the hot water temperature in the heating device 17 is already sufficiently high, the system shuts down the electric auxiliary heating device 2 to avoid unnecessary energy consumption. Third, the system shuts down the water tank pump 12 because it is no longer necessary to draw hot water from the water tank to participate in the heat exchange process. Simultaneously, the system turns on the heating water pump 7 to ensure that the hot water in the heating device 17 can flow to the water side of the first intermediate heat exchanger 21 for effective heat exchange.

[0105] In this way, through the above control measures, the system can directly use the hot water in the heating device 17 to provide heat for the water side of the first intermediate heat exchanger 21, thereby achieving defrosting.

[0106] According to some embodiments of the present invention, after the step of determining whether the water side of the first intermediate heat exchanger 21 has a risk of freezing damage based on the hot water information, the method further includes:

[0107] If it is determined that there is no risk of freezing damage on the water side of the first intermediate heat exchanger 21 , the hot water system is controlled to exit the defrost mode.

[0108] The control device of the hot water system provided by the present invention is described below. The control device of the hot water system described below and the control method of the hot water system described above can be referred to each other.

[0109] like Figure 4 As shown, according to the third embodiment of the present invention, the control device of the hot water system based on the first embodiment of the present invention includes:

[0110] The first acquisition module 110 is configured to receive a signal for controlling the hot water system to enter a defrost mode and acquire hot water information in the first intermediate heat exchanger 21;

[0111] The first control module 120 is configured to determine whether the water side of the first intermediate heat exchanger 21 is at risk of freezing based on the hot water information;

[0112] The second acquisition module 130 is used to determine that there is a risk of freezing on the water side of the first intermediate heat exchanger 21, and then obtain the heating hot water temperature of the heating equipment 17 and the inlet hot water temperature of the domestic water when entering the second intermediate heat exchanger 11;

[0113] The second control module 140 is used to control and adjust one of the heating device 17 and the second intermediate heat exchanger 11 to be connected in series to the water side of the first intermediate heat exchanger 21 according to the heating hot water temperature and the inlet hot water temperature.

[0114] Figure 5 An example of a physical structure diagram of an electronic device is shown below. Figure 5As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other via the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute a control method for the hot water system, including: receiving a signal for controlling the hot water system to enter a defrost mode, obtaining hot water information in the first intermediate heat exchanger 21; determining whether there is a risk of freezing on the water side of the first intermediate heat exchanger 21 based on the hot water information; if it is determined that there is a risk of freezing on the water side of the first intermediate heat exchanger 21, obtaining the heating hot water temperature of the heating device 17 and the inlet hot water temperature of the domestic water when entering the second intermediate heat exchanger 11; and controlling and adjusting one of the heating device 17 and the second intermediate heat exchanger 11 to be connected in series to the water side of the first intermediate heat exchanger 21 based on the heating hot water temperature and the inlet hot water temperature.

[0115] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0116] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the hot water system provided by the above methods, including: receiving a signal to control the hot water system to enter the defrost mode, and obtaining the hot water information in the first intermediate heat exchanger 21; judging whether the water side of the first intermediate heat exchanger 21 is at risk of freezing based on the hot water information; if it is determined that the water side of the first intermediate heat exchanger 21 is at risk of freezing, then obtaining the heating hot water temperature of the heating equipment 17 and the inlet hot water temperature of the domestic water when entering the second intermediate heat exchanger 11; and controlling and adjusting one of the heating equipment 17 and the second intermediate heat exchanger 11 to be connected in series to the water side of the first intermediate heat exchanger 21 based on the heating hot water temperature and the inlet hot water temperature.

[0117] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method for the hot water system provided by the above-mentioned methods, including: receiving a signal to control the hot water system to enter the defrost mode, and obtaining the hot water information in the first intermediate heat exchanger 21; judging whether there is a risk of freezing on the water side of the first intermediate heat exchanger 21 based on the hot water information; if it is determined that there is a risk of freezing on the water side of the first intermediate heat exchanger 21, obtaining the heating hot water temperature of the heating equipment 17 and the inlet hot water temperature of the domestic water when entering the second intermediate heat exchanger 11; and controlling and adjusting one of the heating equipment 17 and the second intermediate heat exchanger 11 to be connected in series to the water side of the first intermediate heat exchanger 21 based on the heating hot water temperature and the inlet hot water temperature.

[0118] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units. That is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0119] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus the necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or certain parts of the embodiment.

[0120] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean 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 embodiment of the present invention. In this specification, the schematic representations of the above terms do 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. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A hot water system, characterized in that: include: A heat pump circuit includes a first intermediate heat exchanger and an outdoor heat exchanger connected by a refrigerant pipe, wherein the first intermediate heat exchanger heats a heating hot water circuit through the refrigerant pipe; A heating hot water circuit includes a heating pipe, a heating device and a second intermediate heat exchanger. The heating pipe flows through the water side of the first intermediate heat exchanger to exchange heat with the refrigerant pipe. The heating device and the second intermediate heat exchanger are connected in parallel, and the water side of the first intermediate heat exchanger can be selectively connected to the heating device or the second intermediate heat exchanger. Domestic hot water flows through the second intermediate heat exchanger to exchange heat with the heating pipe.

2. The hot water system according to claim 1, characterized in that An electric three-way valve is provided in the heating pipe, the inlet of the electric three-way valve is connected to the water side of the first intermediate heat exchanger, and the two outlets of the electric three-way valve are respectively connected to the heating equipment and the second intermediate heat exchanger.

3. The hot water system according to claim 1, characterized in that The heating pipe is also provided with an electric auxiliary heating device.

4. The hot water system according to claim 1, characterized in that A heating water pump is provided on the heating pipe, and the heating water pump is connected in series with the first intermediate heat exchanger.

5. The hot water system according to claim 1, characterized in that Also includes: A domestic water tank is connected to a water tank pipe, which is used to provide domestic hot water to the second intermediate heat exchanger. A water tank pump is provided on the water tank pipe.

6. A control method for a hot water system according to any one of claims 1 to 5, characterized in that: include: receiving a signal for controlling the hot water system to enter a defrost mode, and obtaining hot water information in the first intermediate heat exchanger; determining whether there is a risk of freezing on the water side of the first intermediate heat exchanger based on the hot water information; If it is determined that the water side of the first intermediate heat exchanger is at risk of freezing, the heating hot water temperature of the heating equipment and the inlet hot water temperature of the domestic hot water when entering the second intermediate heat exchanger are obtained; According to the heating hot water temperature and the inlet hot water temperature, one of the heating device and the second intermediate heat exchanger is controlled and adjusted to be connected in series to the water side of the first intermediate heat exchanger.

7. The method for controlling a hot water system according to claim 6, wherein: The hot water information includes the water flow rate change rate and / or the water outlet temperature in the first intermediate heat exchanger; The step of determining whether the water side of the first intermediate heat exchanger has a risk of freezing damage based on the hot water information specifically includes: When the water flow rate change rate is greater than or equal to a preset maximum rate of change, or the water outlet temperature is less than or equal to a preset minimum temperature, it is determined that the water side of the first intermediate heat exchanger is at risk of freezing.

8. The method for controlling a hot water system according to claim 6, wherein: The hot water information includes the water flow rate change rate and / or the water outlet temperature in the first intermediate heat exchanger; The step of determining whether the water side of the first intermediate heat exchanger has a risk of freezing damage based on the hot water information specifically includes: When the water flow rate change rate is less than a preset maximum rate of change, or the outlet water temperature is greater than a preset minimum temperature and lasts for at least a preset time, it is determined that there is no risk of freezing damage on the water side of the first intermediate heat exchanger.

9. The method for controlling a hot water system according to claim 6, wherein: The step of controlling and adjusting one of the heating equipment and the second intermediate heat exchanger connected in series to the water side of the first intermediate heat exchanger according to the heating hot water temperature and the inlet hot water temperature specifically includes: According to the comparison result of the heating hot water temperature and the inlet hot water temperature and the range in which they are located, the valve direction of the electric three-way valve, the switch of the electric auxiliary heating device, and the switch of the heating water pump and the water tank pump are controlled and adjusted.

10. The method for controlling a hot water system according to claim 9, wherein: The step of controlling and adjusting the valve direction of the electric three-way valve, the switch of the electric auxiliary heating device, and the switch of the heating water pump and the water tank pump based on the comparison result of the heating hot water temperature and the inlet hot water temperature and the range of the temperature range, specifically includes: When the heating temperature and the water tank temperature are both less than or equal to the preset minimum temperature, the electric three-way valve is controlled to connect to the second intermediate heat exchanger, and the electric auxiliary heating device is controlled to be turned on, the water tank water pump is turned off, and the heating water pump is turned on.

11. The method for controlling a hot water system according to claim 9, wherein: The step of controlling and adjusting the valve direction of the electric three-way valve, the switch of the electric auxiliary heating device, and the switch of the heating water pump and the water tank pump based on the comparison result of the heating hot water temperature and the inlet hot water temperature and the range of the temperature range, specifically includes: When the heating temperature is less than or equal to the water tank temperature and the water tank temperature is greater than the preset minimum temperature, the electric three-way valve is controlled to connect to the second intermediate heat exchanger, and the electric auxiliary heating device is controlled to be closed, the water tank water pump is turned on, and the heating water pump is turned on.

12. The method for controlling a hot water system according to claim 9, wherein: The step of controlling and adjusting the valve direction of the electric three-way valve, the switch of the electric auxiliary heating device, and the switch of the heating water pump and the water tank pump based on the comparison result of the heating hot water temperature and the inlet hot water temperature and the range of the temperature range, specifically includes: When the heating temperature is greater than the water tank temperature and the heating temperature is greater than the preset minimum temperature, the electric three-way valve is controlled to be connected to the heating equipment, and the electric auxiliary heating device is controlled to be closed, the water tank water pump is closed, and the heating water pump is turned on.

13. A control device for a hot water system according to any one of claims 1 to 5, characterized in that: include: a first acquisition module, configured to receive a signal for controlling the hot water system to enter a defrost mode, and acquire hot water information in the first intermediate heat exchanger; a first control module, configured to determine whether the water side of the first intermediate heat exchanger has a risk of freezing damage based on the hot water information; a second acquisition module, configured to determine that the water side of the first intermediate heat exchanger has a risk of freezing, and then acquire the heating hot water temperature of the heating equipment and the inlet hot water temperature of domestic water when entering the second intermediate heat exchanger; The second control module is used to control and adjust one of the heating equipment and the second intermediate heat exchanger to be connected in series to the water side of the first intermediate heat exchanger according to the heating hot water temperature and the inlet hot water temperature.

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