Heat pump water heater control method and device, heat pump water heater and storage medium

Abstract

The invention discloses a heat pump water heater control method and device, a heat pump water heater and a storage medium, and belongs to the technical field of heat pump systems. When the heat pump water heater needs to store heat energy and heat water energy, after the heat pump water heater is controlled to operate for a target duration according to an initialization strategy, the actual water outlet temperature, the phase change temperature of a heat storage module and the temperature of the heat storage module are detected; determining a target water outlet temperature according to the actual water outlet temperature, the phase change temperature of the heat storage module and the temperature of the heat storage module; and the operation frequency of the compressor is adjusted according to the actual water outlet temperature and the target water outlet temperature. In this way, the optimal value is found to correct the target outlet water temperature by detecting the actual outlet water temperature and the temperature of the phase-change material of the heat storage module and controlling the temperature difference between the actual outlet water temperature and the phase-change material of the heat storage module, then the operation states of the indoor unit and the outdoor unit and the frequency of the compressor are adjusted, the most energy-saving operation state can be achieved, and energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump systems, and particularly to a control method and device for a heat pump water heater, a heat pump water heater, and a storage medium. Background Art

[0002] Conventional heat pump water heaters generally continuously heat the water in the water tank through a heat pump system so that the water in the water tank maintains a relatively high water temperature for users to use. However, during the heat charging and energy storage process, generally, the outlet water temperature of the heat pump is controlled to meet the heat storage requirement. However, when the outlet water temperature is too high during the heat charging and energy storage process, the energy consumption is large.

[0003] The above content is only used to assist in understanding the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main objective of the present invention is to provide a control method and device for a heat pump water heater, a heat pump water heater, and a storage medium, aiming to solve the technical problem of large energy consumption caused by too high outlet water temperature of the heat pump water heater during the heat charging and energy storage process in the prior art.

[0005] To achieve the above objective, the present invention provides a control method for a heat pump water heater. The control method for the heat pump water heater is applied to a heat pump water heater. The heat pump water heater includes a heat pump main unit, a hydraulic module, and a heat storage module. The heat pump main unit includes a gas-liquid separator, a compressor, a reversing device, a condenser, an outdoor fan, and an expansion valve. The hydraulic module includes an electric heating module, a water flow switch, a water pump, and an expansion tank. The heat pump main unit is connected to the hydraulic module through a water-fluorine heat exchanger. The heat storage module includes a first heat exchange water path and a second heat exchange water path. The heat storage module is connected to the hydraulic module through the first heat exchange water path. The second heat exchange water path is connected to a user water pipeline. The first heat exchange water path is used for heat storage, and the second heat exchange water path is used for heat exchange with the first heat exchange water path;

[0006] The control method for the heat pump water heater includes:

[0007] When there is a heat storage energy demand and a hot water production energy demand in the heat pump water heater, after controlling the heat pump water heater to operate for a target duration according to an initialization strategy, detect the actual outlet water temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module;

[0008] Determine a target outlet water temperature according to the actual outlet water temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module;

[0009] Adjust the operating frequency of the compressor according to the actual outlet water temperature and the target outlet water temperature.

[0010] Optionally, controlling the heat pump water heater to operate for a target duration according to an initialization strategy includes:

[0011] When there are heat storage energy requirements and hot water production energy requirements in the heat pump water heater, detect the ambient temperature;

[0012] Determine the initial operating frequency and the initial target outlet water temperature according to the ambient temperature;

[0013] After controlling the heat pump water heater to operate for the target duration according to the initial operating frequency and the initial target outlet water temperature, detect the actual outlet water temperature and the phase change temperature of the heat storage module.

[0014] Optionally, determining the initial operating frequency and the initial target outlet water temperature according to the ambient temperature includes:

[0015] Obtain the heat pump energy requirement, the first correction coefficient, and the second correction coefficient of the heat pump water heater;

[0016] Determine the initial operating frequency and the initial target outlet water temperature according to the heat pump energy requirement, the first correction coefficient, the second correction coefficient, and the ambient temperature.

[0017] Optionally, determining the target outlet water temperature according to the actual outlet water temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module includes:

[0018] Compare the actual outlet water temperature with the phase change temperature of the heat storage module;

[0019] Determine the target outlet water temperature according to the comparison result and the temperature of the heat storage module.

[0020] Optionally, determining the target outlet water temperature according to the comparison result and the temperature of the heat storage module includes:

[0021] Determine a target temperature difference according to the comparison result, where the target temperature difference is the difference between the target outlet water temperature and the temperature of the heat storage module;

[0022] Determine the target outlet water temperature according to the target temperature difference and the temperature of the heat storage module.

[0023] Optionally, adjusting the operating frequency of the compressor according to the actual outlet water temperature and the target outlet water temperature includes:

[0024] Determine a water temperature difference according to the actual outlet water temperature and the target outlet water temperature;

[0025] Determine a change value of the water temperature difference according to the water temperature difference;

[0026] Determine the target operating frequency according to the change value of the water temperature difference, and adjust the operating frequency of the compressor according to the target operating frequency.

[0027] Optionally, the determining the target operating frequency according to the change value of the water temperature difference includes:

[0028] Determine the value range corresponding to the change value of the water temperature difference;

[0029] Determine the frequency compensation strategy according to the value range;

[0030] Obtain the third correction coefficient, the water pump operating coefficient, the current target frequency, and the current operating frequency;

[0031] Determine the target operating frequency according to the third correction coefficient, the water pump operating coefficient, the current target frequency, the current operating frequency, and the frequency compensation strategy.

[0032] In addition, to achieve the above object, the present invention further provides a heat pump water heater control device. The heat pump water heater includes a heat pump main unit, a hydraulic module, and a heat storage module. The heat pump main unit includes a gas-liquid separator, a compressor, a reversing device, a condenser, an outdoor fan, and an expansion valve. The hydraulic module includes an electric heating module, a water flow switch, a water pump, and an expansion tank. The heat pump main unit is connected to the hydraulic module through a water-fluorine heat exchanger. The heat storage module includes a first heat exchange water path and a second heat exchange water path. The heat storage module is connected to the hydraulic module through the first heat exchange water path. The second heat exchange water path is connected to the user water pipeline. The first heat exchange water path is used for heat storage, and the second heat exchange water path is used for heat exchange with the first heat exchange water path;

[0033] The heat pump water heater control device includes:

[0034] A temperature detection module, configured to, when there is a heat storage energy demand and a hot water production energy demand in the heat pump water heater, control the heat pump water heater to operate for a target duration according to an initialization strategy, and then detect the actual water outlet temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module;

[0035] A water temperature calculation module, configured to determine a target water outlet temperature according to the actual water outlet temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module;

[0036] A frequency adjustment module, configured to adjust the operating frequency of the compressor according to the actual water outlet temperature and the target water outlet temperature.

[0037] In addition, to achieve the above object, the present invention also provides a heat pump water heater, which includes: a memory, a processor, and a heat pump water heater control program stored on the memory and running on the processor. The heat pump water heater control program is configured to implement the heat pump water heater control method as described above.

[0038] In addition, to achieve the above object, the present invention also provides a storage medium, on which a heat pump water heater control program is stored. When the heat pump water heater control program is executed by a processor, it implements the heat pump water heater control method as described above.

[0039] When there is a heat storage energy demand and a hot water production energy demand in the heat pump water heater of the present invention, after controlling the heat pump water heater to operate for a target duration according to the initialization strategy, the actual water outlet temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module are detected; the target water outlet temperature is determined according to the actual water outlet temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module; the operating frequency of the compressor is adjusted according to the actual water outlet temperature and the target water outlet temperature. In this way, by detecting the actual water outlet temperature and the temperature of the phase change material of the heat storage module, and controlling the temperature difference between the two to find the optimal value to correct the target water outlet temperature, and then adjusting the operating states of the indoor and outdoor units and the compressor frequency, the most energy-saving operating state can be achieved, and the energy consumption can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic structural diagram of a heat pump water heater in the hardware operating environment related to the embodiment solution of the present invention;

[0041] Figure 2 is a schematic flowchart of the first embodiment of the heat pump water heater control method of the present invention;

[0042] Figure 3 is a schematic structural diagram of a heat pump water heater in an embodiment of the heat pump water heater control method of the present invention;

[0043] Figure 4 is a schematic flowchart of the second embodiment of the heat pump water heater control method of the present invention;

[0044] Figure 5 is a structural block diagram of the first embodiment of the heat pump water heater control device of the present invention.

[0045] DESCRIPTION OF REFERENCE NUMERALS:

[0046] Label Name Label Name 10 Heat pump main unit 17 Water-fluorine heat exchanger 20 Hydraulic module 21 Electric auxiliary heating device 30 Heat storage module 22 Flow switch 11 Gas-liquid separator 23 Water pump 12 Compressor 24 Expansion tank 13 Reversing device 25 First sensor 14 Outdoor heat exchanger 31 First heat exchange water path 15 Outdoor fan 32 Second heat exchange water path 16 Expansion valve 33 Second sensor

[0047] The realization, functional features, and advantages of the object of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] It should be understood that the specific embodiments described herein are only for explaining the present invention and are not used to limit the present invention.

[0049] Referring to Figure 1 , Figure 1 FIG. is a schematic structural diagram of a heat pump water heater for a hardware operating environment related to the solution of the embodiment of the present invention.

[0050] As Figure 1 shown, the heat pump water heater may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display) and an input unit such as a keyboard (Keyboard). Optionally, the user interface 1003 may further include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM) or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0051] Those skilled in the art can understand that Figure 1 the structure shown in

[0052] does not constitute a limitation on the heat pump water heater, and may include more or fewer components than shown in the figure, or combine some components, or arrange different components. Figure 1 As

[0053] shown, the memory 1005, as a storage medium, may include an operating system, a network communication module, a user interface module, and a heat pump water heater control program. Figure 1 In the heat pump water heater shown in

[0054] the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the heat pump water heater of the present invention may be arranged in the heat pump water heater. The heat pump water heater calls the heat pump water heater control program stored in the memory 1005 through the processor 1001 and executes the heat pump water heater control method provided by the embodiment of the present invention. Figure 2 ,Figure 2 It is a schematic flowchart of the first embodiment of a control method for a heat pump water heater according to the present invention.

[0055] In this embodiment, the control method for the heat pump water heater includes the following steps:

[0056] Step S10: When there is a need for heat storage energy and hot water production energy in the heat pump water heater, control the heat pump water heater to operate for a target duration according to the initialization strategy, and then detect the actual water outlet temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module.

[0057] In this embodiment, the execution subject of this embodiment can be the control device of the heat pump water heater. This heat pump water heater control device has functions such as data processing, data communication, and program operation. The heat pump water heater control device can be a controller inside the heat pump water heater. Of course, it can also be other devices with similar functions, and this embodiment does not limit this. For the convenience of description, this embodiment is described by taking the heat pump water heater control device as an example.

[0058] It should be noted that most of the heat pump water heaters on the market at present are storage-type, and the water in the water tank is heated by the heat pump system. The water stored in the water tank is in a "stagnant water" state. To overcome this drawback, a new type of phase change heat storage heat pump water heater has emerged on the market. The phase change heat storage material is filled into the gaps between the heat exchange tubes of the heat storage module of the heat pump water heater, and heat exchange is carried out between the hot water in the tube and the phase change heat storage material to complete the phase change energy storage of the phase change heat storage material, and then heat is released when using hot water to meet the user's demand for hot water. However, during the energy storage process, it is generally achieved by controlling whether the water outlet temperature of the heat pump reaches the heat storage required temperature. When the capacities of the matching heat pump hosts are different, accurate control cannot be achieved.

[0059] To solve the above technical problems, in this embodiment, by detecting the actual water outlet temperature and the temperature of the phase change material of the heat storage module, and controlling the temperature difference between the two to find the optimal value to correct the target water outlet temperature, and then adjusting the operating states of the indoor and outdoor units and the compressor frequency, the most energy-saving operating state can be achieved and the energy consumption can be reduced.

[0060] It is worth noting that the heat pump water heater mentioned in this embodiment and the following embodiments refers to such as Figure 3The shown phase change heat pump water heater, the phase change heat pump water heater includes a heat pump main unit 10, a hydraulic module 20 and a heat storage module 30. The heat pump main unit 10 includes a gas-liquid separator 11, a compressor 12, a commutation device 13, an outdoor heat exchanger 14, an outdoor fan 15 and an expansion valve 16. The hydraulic module 20 includes an electric auxiliary heating device 21, a water flow switch 22, a water pump 23, an expansion tank 24 and a water-fluorine heat exchanger 17. The hydraulic module is also provided with a first sensor 25, and the heat storage module 30 is also provided with a second sensor 33. The first sensor 25 is used to collect the outlet water temperature, and the second sensor 33 is used to collect the temperature of the heat storage module. The heat pump main unit is connected to the hydraulic module through the water-fluorine heat exchanger 17.

[0061] Among them, the outdoor fan 15 is used to reduce the coil temperature of the outdoor heat exchanger 14, thereby accelerating the heat exchange between the heat exchanger and the external environment, and further achieving the control of the heating output capacity of the heat pump main unit 10. The greater the rotation speed of the outdoor fan 15, the greater the heating output of the heat pump main unit 10, and the smaller the rotation speed of the outdoor fan 14, the smaller the heating output capacity of the heat pump main unit 10.

[0062] Among them, the heat storage module includes a first heat exchange water path 31 and a second heat exchange water path 32. The first heat exchange water path 31 and the second heat exchange water path 32 together form a heat storage module heat exchanger. The heat storage module is connected to the hydraulic module 20 through the first heat exchange water path 31. The second heat exchange water path 32 is connected to the user water pipeline. The first heat exchange water path 31 is used to store heat for the phase change material in the heat storage module, and the second heat exchange water path 32 is used to exchange heat with the first heat exchange water path through the phase change material.

[0063] During the operation of the heat pump main unit in the heat storage mode, the compressor 12 outputs high-temperature and high-pressure refrigerant to the commutation device 13. Through the selected terminal D-C of the commutation device 13, the high-temperature and high-pressure refrigerant exchanges heat through the water-fluorine heat exchanger 17. At this time, the water-fluorine heat exchanger 17 is used as an outdoor heat exchanger. After the refrigerant exchanges heat through the water-fluorine heat exchanger 17, it sequentially passes through the expansion valve 16, the outdoor heat exchanger 14, the selected terminal E-S of the commutation device 13 and the gas-liquid separator 11 and returns to the compressor. During this process, since the first side of the water-fluorine heat exchanger 17 is connected to the heat pump main unit and the second side is connected to the hydraulic module, when there is high-temperature and high-pressure refrigerant on the first side of the water-fluorine heat exchanger, due to the temperature difference between the two sides of the water-fluorine heat exchanger, the refrigerant on the first side will heat the water flowing through the second side of the water-fluorine heat exchanger, thereby realizing the heating of the water in the pipeline of the hydraulic module.

[0064] In the hydraulic module, water is sent to the water-fluorine heat exchanger 17 by a water pump, so that the water body in the pipeline passes through the water-fluorine heat exchanger 17 for heating, and then flows through the first heat exchange water path 31 of the heat storage module through the electric auxiliary heating device 21 and the water flow switch 22 in sequence, realizing heat exchange with the phase change material filled in the heat storage module, achieving the purpose of heat storage, and finally flowing back to the expansion tank 24 or the water pump 23 to participate in the next water-fluorine heat exchange.

[0065] In the heat storage module, tap water enters the second heat exchange water path 32 of the heat storage module through the one-way valve in the user water pipeline. The second heat exchange water path 32 exchanges heat with the phase change material filled in the heat storage module to raise the temperature of the user's water.

[0066] In this embodiment, the heat pump host and the hydraulic module can be integrated into one module, that is, the hydraulic part is included in the heat pump host, or they can be installed separately and independently. The heat storage water tank can be a separate heat storage module, or the heat storage module and the hydraulic part can together form the heat storage water tank.

[0067] The heat exchanger of the heat storage module can be composed of a finned tube heat exchanger and the phase change material filled in its gaps. There are two water paths in the finned tube heat exchanger. One is connected to the hydraulic module, and the hot water provided by the hydraulic module pipeline flows through the heat exchanger of the heat storage module or the coil of the heat storage module to exchange heat with the phase change material, realizing the heat charging and energy storage process of the heat storage module. The other is connected to the user water pipeline. When the user uses hot water, tap water is replenished. The external water body exchanges heat with the phase change material through the second heat exchange water path in the heat exchanger of the heat storage module, realizing the heat release of the phase change material, achieving the process of raising the temperature of the user's water, meeting the user's demand for using hot water, and can mix water through the bypass tap water branch to control the water outlet temperature and meet the user's demand for the water temperature of the used water.

[0068] It should be noted that when the heat pump water heater performs heat storage and energy storage, that is, when the heat storage mode is turned on, after the heat storage mode, the outlet temperature of the hydraulic module is first detected. That is, the temperature detected by the first sensor 25 is used as the outlet temperature of the hydraulic module. Then, according to the outlet temperature, it is judged whether the heat pump water heater has heat storage energy demand in the current state. Specifically, it is judged whether there is heat storage energy demand according to the temperature trend of the outlet temperature. After determining that the current heat pump water heater has heat storage energy demand, it is also necessary to judge whether there is hot water production energy demand. The specific judgment method is to judge according to the ambient temperature, and the ambient temperature is the temperature of the environment where the heat pump host is located.

[0069] It should be understood that when it is determined that the heat pump water heater has a need for heat storage energy and a need for hot water production, the heat pump water heater is first controlled to operate according to the initialization strategy, and then the actual water outlet temperature, the phase change temperature of the heat storage module and the heat storage module temperature are detected after the target duration is reached. Among them, the initialization strategy is the initial operating frequency of the compressor and the initial target water outlet temperature determined according to the ambient temperature. The target duration is a pre-set duration and can be any length of time, which is not limited in this embodiment. The actual water outlet temperature refers to the temperature at which water is actually transported to the user's water use end, the phase change temperature of the heat storage module refers to the temperature of the phase change material in the heat storage module, and the heat storage module temperature refers to the water temperature in the hot water storage tank in the heat storage module.

[0070] Furthermore, in order to accurately control the target operation time of the heat pump water heater according to the initialization strategy, the ambient temperature is first detected, and the ambient temperature is the temperature of the environment, room, etc. where the heat pump host is located, and then the initial operation frequency and the initial target water outlet temperature are determined according to the ambient temperature. Among them, the initial operation frequency and the initial target water outlet temperature are the operating parameters of the heat pump water heater during the operation of the initialization strategy.

[0071] In a specific implementation, after the initial operating frequency and the initial target water outlet temperature are determined, the heat pump water heater is controlled to operate at the initial operating frequency and the initial target water outlet temperature for the target time, and then the actual water outlet temperature and the phase change temperature of the heat storage module are detected.

[0072] Furthermore, in order to accurately calculate the initial operating frequency and the initial target water outlet temperature, the heat pump energy requirement of the heat pump water heater, as well as the preset first correction coefficient and the second correction coefficient are first obtained. The heat pump energy requirement is QWn, which is the preset energy requirement of the heat pump water heater. The first correction coefficient and the second correction coefficient are preset fixed parameters and can be any values, which are not limited in this embodiment.

[0073] It should be noted that the calculation method of the initial operating frequency is fQWn=A*∑QWn+B, where the heat pump energy required is QWn, the first correction coefficient is A, the second correction coefficient is B, and the initial target water outlet temperature TW0 can be a pre-set fixed water temperature, which is not limited in this embodiment.

[0074] Step S20: determining a target outlet water temperature according to the actual outlet water temperature, the phase change temperature of the thermal storage module and the thermal storage module temperature.

[0075] It should be understood that after the actual water outlet temperature, the phase change temperature of the heat storage module and the heat storage module temperature are detected, the actual water outlet temperature is compared with the phase change temperature of the heat storage module, and the target water outlet temperature is determined based on the comparison result combined with the heat storage module temperature.

[0076] Further, in order to accurately determine the target outlet water temperature, first compare the actual outlet water temperature with the phase change temperature of the heat storage module. According to the comparison results, there are three cases, namely when the actual outlet water temperature > the phase change temperature of the heat storage module; when the actual outlet water temperature = the phase change temperature of the heat storage module; when the actual outlet water temperature < the phase change temperature of the heat storage module. Then calculate the comparison results with the temperature of the heat storage module to determine the target temperature difference, and further determine the target outlet water temperature according to the target temperature difference.

[0077] Further, in order to accurately determine the target temperature difference, when the actual outlet water temperature > the phase change temperature of the heat storage module, control the target temperature difference (the difference between the target water temperature and the temperature of the heat storage module) to be Ta; when the actual outlet water temperature = the phase change temperature of the heat storage module, control the target temperature difference (the difference between the target water temperature and the temperature of the heat storage module) to be Tb; when the actual outlet water temperature < the phase change temperature of the heat storage module, control the target temperature difference (the difference between the target water temperature and the temperature of the heat storage module) to be Tc. Wherein, Ta, Tb, and Tc are all temperature values of preset fixed numerical values. Then combine the temperature of the heat storage module and the target temperature difference to obtain the target outlet water temperature.

[0078] Step S30: Adjust the operating frequency of the compressor according to the actual outlet water temperature and the target outlet water temperature.

[0079] It should be noted that after obtaining the actual outlet water temperature and the target outlet water temperature, determine the target operating frequency according to the actual outlet water temperature and the target outlet water temperature, and then adjust the operating frequency of the compressor according to the target operating frequency.

[0080] In this embodiment, by detecting the actual outlet water temperature and the temperature of the phase change material of the heat storage module, and controlling the temperature difference between the two to find the optimal value to correct the target outlet water temperature, and then adjusting the operating states of the indoor and outdoor units and the compressor frequency, the most energy-saving operating state can be achieved and the energy consumption can be reduced.

[0081] Reference Figure 4 , Figure 4 is a schematic flowchart of the second embodiment of a control method for a heat pump water heater according to the present invention.

[0082] Based on the above first embodiment, the control method for the heat pump water heater in this embodiment includes in the step S30:

[0083] Step S301: Determine the water temperature difference according to the actual outlet water temperature and the target outlet water temperature.

[0084] It should be noted that after obtaining the actual outlet water temperature and the target outlet water temperature, first determine the water temperature difference, and the water temperature difference is the difference between the actual outlet water temperature and the target outlet water temperature.

[0085] Step S302: Determine the change value of the water temperature difference according to the water temperature difference.

[0086] It should be understood that the change value of the water temperature difference is the absolute value of the change between the water temperature difference and the previously calculated value, denoted as Δfi.

[0087] Step S303: Determine the target operating frequency according to the change value of the water temperature difference, and adjust the operating frequency of the compressor according to the target operating frequency.

[0088] In a specific implementation, after obtaining the water temperature difference and the change value of the water temperature difference, first determine the value range corresponding to the change value of the water temperature difference, and then calculate based on the value range in combination with the third correction coefficient, the water pump operation coefficient, the current target frequency, and the current operating frequency to obtain the corresponding target operating frequency. Finally, adjust the operating frequency of the compressor according to the target operating frequency.

[0089] Further, in order to accurately determine the target operating frequency, first determine the value range corresponding to the change value of the water temperature difference. The specific value range is divided into three cases, namely Δfi > 0, Δfi = 0, and Δfi < 0.

[0090] It should be noted that after determining the value range, determine the corresponding frequency compensation strategy according to the different value ranges. The frequency compensation strategy also corresponds to three cases of Δfi > 0, Δfi = 0, and Δfi < 0.

[0091] It should be understood that finally, obtain the third correction coefficient, the water pump operation coefficient, the current target frequency, and the current operating frequency. Among them, the third correction coefficient is a preset fixed coefficient, which can be any value, and this embodiment does not limit it. The water pump operation coefficient determines the value of K according to the output size of the water pump water flow. The larger the water pump output, the larger the K value. The current target frequency is the frequency that the compressor needs to reach as the target in the current operating state to complete the hot water production energy. The current operating frequency is the operating frequency of the compressor at the current moment.

[0092] In a specific implementation, the specific calculation method of the target operating frequency is as follows:

[0093] When Δfi > 0, perform positive compensation: obtain the target operating frequency fb = fo + KΔfi × C;

[0094] When Δfi = 0, remain unchanged: the target operating frequency fb = fb(n - 1);

[0095] When Δfi < 0, perform negative compensation: the target operating frequency fb = KΔfi × C + min(fr, fo, fb(n - 1));

[0096] Then control the operation of the compressor according to the corrected target frequency fb.

[0097] Wherein, fo is the current target frequency; fr is the current operating frequency; K is the pump operation coefficient, and the value of K is determined according to the output size of the pump water flow. When the pump output is large, the value of K is large; C is the third correction coefficient, and the value is taken according to the actual situation.

[0098] In this embodiment, the water temperature difference is determined according to the actual outlet water temperature and the target outlet water temperature; the change value of the water temperature difference is determined according to the water temperature difference; the target operating frequency is determined according to the change value of the water temperature difference, and the operating frequency of the compressor is adjusted according to the target operating frequency. By selecting the optimized value of the frequency according to the water temperature difference and the change value of the water temperature difference to adjust the operating frequency of the compressor, the adjusted heat pump water heater can be in the most energy-saving operating state to meet the energy demand and reduce energy consumption.

[0099] In addition, an embodiment of the present invention also provides a storage medium, on which a heat pump water heater control program is stored. When the heat pump water heater control program is executed by a processor, the steps of the heat pump water heater control method as described above are implemented.

[0100] Since this storage medium adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated here one by one.

[0101] Referring to Figure 5 , Figure 5 is the structural block diagram of the first embodiment of the heat pump water heater control device of the present invention.

[0102] As Figure 5 shown, the heat pump water heater control device proposed by the embodiment of the present invention includes:

[0103] A temperature detection module 10, configured to detect the actual outlet water temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module after controlling the heat pump water heater to operate for a target duration according to an initialization strategy when there is a heat storage energy demand and a hot water production energy demand in the heat pump water heater.

[0104] A water temperature calculation module 20, configured to determine the target outlet water temperature according to the actual outlet water temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module.

[0105] A frequency adjustment module 30, configured to adjust the operating frequency of the compressor according to the actual outlet water temperature and the target outlet water temperature.

[0106] In one embodiment, the temperature detection module 10 is further configured to detect the ambient temperature when there is a thermal energy storage demand and a hot water production energy demand in the heat pump water heater; determine an initial operating frequency and an initial target water outlet temperature according to the ambient temperature; after controlling the heat pump water heater to operate for a target duration according to the initial operating frequency and the initial target water outlet temperature, detect the actual water outlet temperature and the phase change temperature of the heat storage module.

[0107] In one embodiment, the temperature detection module 10 is further configured to obtain the heat pump energy demand, a first correction coefficient, and a second correction coefficient of the heat pump water heater; determine an initial operating frequency and an initial target water outlet temperature according to the heat pump energy demand, the first correction coefficient, the second correction coefficient, and the ambient temperature.

[0108] In one embodiment, the water temperature calculation module 20 is further configured to compare the actual water outlet temperature with the phase change temperature of the heat storage module; determine the target water outlet temperature according to the comparison result and the temperature of the heat storage module.

[0109] In one embodiment, the water temperature calculation module 20 is further configured to determine a target temperature difference according to the comparison result, where the target temperature difference is the difference between the target water outlet temperature and the temperature of the heat storage module; determine the target water outlet temperature according to the target temperature difference and the temperature of the heat storage module.

[0110] In one embodiment, the frequency adjustment module 30 is further configured to determine a water temperature difference according to the actual water outlet temperature and the target water outlet temperature; determine a change value of the water temperature difference according to the water temperature difference; determine a target operating frequency according to the change value of the water temperature difference, and adjust the operating frequency of the compressor according to the target operating frequency.

[0111] In one embodiment, the frequency adjustment module 30 is further configured to determine a value range corresponding to the change value of the water temperature difference; determine a frequency compensation strategy according to the value range; obtain a third correction coefficient, a water pump operation coefficient, a current target frequency, and a current operating frequency; determine the target operating frequency according to the third correction coefficient, the water pump operation coefficient, the current target frequency, the current operating frequency, and the frequency compensation strategy.

[0112] In this embodiment, by detecting the actual water outlet temperature and the temperature of the phase change material of the heat storage module, and controlling the temperature difference between the two to find the optimal value to correct the target water outlet temperature, and then adjusting the operating states of the indoor and outdoor units and the compressor frequency, the most energy-saving operating state can be achieved, and the energy consumption can be reduced.

[0113] It should be understood that the above is only an example for illustration, and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can set according to needs, and the present invention does not limit this.

[0114] It should be noted that the above-described work process is only illustrative and does not limit the scope of protection of the present invention. In actual applications, those skilled in the art can select some or all of them according to actual needs to achieve the purpose of the solution of this embodiment, and no limitation is made here.

[0115] In addition, for the technical details not described in detail in this embodiment, reference can be made to the heat pump water heater control method provided in any embodiment of the present invention, and details will not be repeated here.

[0116] In addition, it should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the phrase "including a..." does not exclude the existence of additional identical elements in the process, method, article or system including that element.

[0117] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0118] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that makes a contribution to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as a read-only memory (ROM) / RAM, magnetic disk, optical disk), and includes several instructions for causing a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

[0119] The above is only the preferred embodiment of the present invention, and does not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A control method for a heat pump water heater, characterized in that, The control method of the heat pump water heater is applied to a heat pump water heater, which includes a heat pump main unit, a hydraulic module, and a heat storage module. The heat pump main unit includes a compressor, a reversing device, a condenser, an outdoor fan, and an expansion valve. The hydraulic module includes a water pump and a water-fluorine heat exchanger. The heat pump main unit is connected to the hydraulic module through the water-fluorine heat exchanger. The heat storage module includes a first heat exchange water circuit and a second heat exchange water circuit. The heat storage module is connected to the hydraulic module through the first heat exchange water circuit. The second heat exchange water circuit is connected to the user's water pipeline. The first heat exchange water circuit is used for heat storage, and the second heat exchange water circuit is used for heat exchange with the first heat exchange water circuit; The control method of the heat pump water heater includes: When there is a heat storage energy demand and a hot water production energy demand in the heat pump water heater, after controlling the heat pump water heater to operate for a target duration according to the initialization strategy, detect the actual water outlet temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module; Determine the target water outlet temperature according to the actual water outlet temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module; Adjust the operating frequency of the compressor according to the actual water outlet temperature and the target water outlet temperature.

2. The control method for a heat pump water heater according to claim 1, characterized in that, The controlling the heat pump water heater to operate for a target duration according to the initialization strategy includes: When there is a heat storage energy demand and a hot water production energy demand in the heat pump water heater, detect the ambient temperature; Determine the initial operating frequency and the initial target water outlet temperature according to the ambient temperature; After controlling the heat pump water heater to operate for a target duration according to the initial operating frequency and the initial target water outlet temperature, detect the actual water outlet temperature and the phase change temperature of the heat storage module.

3. The control method for a heat pump water heater according to claim 2, characterized in that, The determining the initial operating frequency and the initial target water outlet temperature according to the ambient temperature includes: Obtain the heat pump energy demand, the first correction coefficient, and the second correction coefficient of the heat pump water heater; Determine the initial operating frequency and the initial target water outlet temperature according to the heat pump energy demand, the first correction coefficient, the second correction coefficient, and the ambient temperature.

4. The control method for a heat pump water heater according to claim 1, characterized in that, The determining the target water outlet temperature according to the actual water outlet temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module includes: Compare the actual water outlet temperature with the phase change temperature of the heat storage module; Determine the target water outlet temperature according to the comparison result and the temperature of the heat storage module.

5. The control method for a heat pump water heater according to claim 4, characterized in that, The determining the target water outlet temperature according to the comparison result and the temperature of the heat storage module includes: Determine the target temperature difference according to the comparison result. The target temperature difference is the difference between the target water outlet temperature and the temperature of the heat storage module; Determine the target water outlet temperature according to the target temperature difference and the temperature of the heat storage module.

6. The control method for a heat pump water heater according to claim 1, characterized in that, The adjusting the operating frequency of the compressor according to the actual water outlet temperature and the target water outlet temperature includes: Determine the water temperature difference according to the actual water outlet temperature and the target water outlet temperature; Determine the change value of the water temperature difference according to the water temperature difference; Determine the target operating frequency according to the change value of the water temperature difference, and adjust the operating frequency of the compressor according to the target operating frequency.

7. The control method for a heat pump water heater according to claim 6, characterized in that, The determining the target operating frequency according to the change value of the water temperature difference includes: Determine the value range corresponding to the change value of the water temperature difference; Determine a frequency compensation strategy according to the value range; Obtain a third correction coefficient, a water pump operation coefficient, a current target frequency, and a current operating frequency; Determine a target operating frequency according to the third correction coefficient, the water pump operation coefficient, the current target frequency, the current operating frequency, and the frequency compensation strategy.

8. A control device for a heat pump water heater, characterized in that, The heat pump water heater includes a heat pump main unit, a hydraulic module, and a heat storage module. The heat pump main unit includes a compressor, a reversing device, a condenser, an outdoor fan, and an expansion valve. The hydraulic module includes a water pump and a water-fluorine heat exchanger. The heat pump main unit is connected to the hydraulic module through the water-fluorine heat exchanger. The heat storage module includes a first heat exchange water circuit and a second heat exchange water circuit. The heat storage module is connected to the hydraulic module through the first heat exchange water circuit. The second heat exchange water circuit is connected to a user water pipeline. The first heat exchange water circuit is used for heat storage, and the second heat exchange water circuit is used for heat exchange with the first heat exchange water circuit; The heat pump water heater control device includes: A temperature detection module, configured to, when there is a heat storage energy demand and a hot water production energy demand in the heat pump water heater, control the heat pump water heater to operate for a target duration according to an initialization strategy, and then detect the actual water outlet temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module; A water temperature calculation module, configured to determine a target water outlet temperature according to the actual water outlet temperature, the phase change temperature of the heat storage module, and the temperature of the heat storage module; A frequency adjustment module, configured to adjust the operating frequency of the compressor according to the actual water outlet temperature and the target water outlet temperature.

9. A heat pump water heater, characterized in that, The heat pump water heater includes: a memory, a processor, and a heat pump water heater control program stored on the memory and running on the processor. The heat pump water heater control program is configured to implement the heat pump water heater control method according to any one of claims 1 to 7.

10. A storage medium, characterized in that, A heat pump water heater control program is stored on the storage medium. When the heat pump water heater control program is executed by a processor, it implements the heat pump water heater control method according to any one of claims 1 to 7.

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