Start-up control method of heat pump water heater, heat pump water heater and storage medium

Abstract

The application belongs to the technical field of household appliances, and particularly relates to a starting control method of a heat pump water heater, the heat pump water heater and a storage medium, and is used for solving the technical problem that the existing heat pump water heater lacks starting control in multiple modes. The starting control method comprises detecting an actual temperature corresponding to the heat pump water heater, and determining whether the heat pump water heater meets a starting condition in a coexistence mode according to the actual temperature; if the heat pump water heater meets the starting condition in the corresponding coexistence mode, the first control valve and the second control valve are respectively controlled to be opened to a preset opening degree, and after the refrigeration and heating water circuit continuously conducts at the preset opening degree for more than or equal to a preset time threshold, the heat pump water heater is started. The application can ensure that the heat pump water heater can be stably and reliably started in multiple modes.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to a start-up control method for a heat pump water heater, a heat pump water heater, and a storage medium. Background Technology

[0002] With the continuous development of science and technology and the continuous improvement of people's living standards, air source heat pump water heaters have gradually entered more and more homes and offices.

[0003] Currently, traditional air source heat pump water heaters typically only include hot water production, while indoor cooling and heating are usually handled by separate cooling and heating equipment. This results in low equipment utilization rates for both the traditional air source heat pump water heater and the cooling and heating equipment, and also occupies a large installation space, leading to low space utilization. To address this, a new type of air source heat pump water heater has been developed that integrates hot water production, cooling, and heating functions into one unit, making it a multi-functional appliance that improves both equipment and space utilization.

[0004] However, the start-up control method for novel air source heat pump water heaters operating in multiple modes still needs further research. Summary of the Invention

[0005] This application provides a start-up control method for a heat pump water heater, a heat pump water heater, and a storage medium, which can ensure that the heat pump water heater can start stably and reliably in multiple modes.

[0006] In a first aspect, embodiments of this application provide a method for controlling the start-up of a heat pump water heater. The heat pump water heater includes a cooling and heating water circuit, a hot water tank, and a control valve assembly. The cooling and heating water circuit includes a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a hot water heat exchanger. The compressor, the outdoor heat exchanger, and the indoor heat exchanger are interconnected in the cooling and heating water circuit. The compressor, the hot water heat exchanger, and the indoor heat exchanger are also interconnected. The hot water heat exchanger is used to heat the hot water tank, and the indoor heat exchanger is used to exchange heat with the indoor environment. The control valve assembly includes a first control valve and a second control valve. The first control valve is connected between the outdoor heat exchanger and the indoor heat exchanger, and the second control valve is connected between the hot water heat exchanger and the indoor heat exchanger. The method includes:

[0007] The actual temperature corresponding to the heat pump water heater is detected, and it is determined whether the heat pump water heater meets the start-up conditions in the coexistence mode based on the actual temperature. The actual temperature includes the actual temperature of the hot water in the hot water tank and the actual cooling temperature of the heat pump water heater. The coexistence mode is a mode in which hot water mode and cooling mode coexist.

[0008] If the heat pump water heater meets the start-up conditions corresponding to the coexistence mode, then the first control valve and the second control valve are controlled to open to the preset opening degree respectively;

[0009] The heat pump water heater is started after the cooling and heating water circuit is continuously connected at the preset opening degree for a time greater than or equal to a preset time threshold.

[0010] The start-up control method described above, wherein controlling the first control valve and the second control valve to open to a preset opening degree, specifically includes:

[0011] Adjust the opening degree of the first control valve and the second control valve to the maximum opening degree;

[0012] Alternatively, based on the frequency of the compressor and the outdoor ambient temperature where the outdoor heat exchanger is located, the preset opening degree corresponding to the first control valve and the second control valve is determined respectively, and the opening degree of the first control valve and the second control valve is adjusted to the preset opening degree.

[0013] The start-up control method described above, wherein determining the opening degrees of the first control valve and the second control valve based on the compressor frequency and the outdoor ambient temperature where the outdoor heat exchanger is located, specifically includes:

[0014] The preset opening degree of the first control valve is determined based on the compressor frequency, the outdoor ambient temperature, the preset indoor temperature where the indoor heat exchanger is located, and the actual indoor temperature.

[0015] In the start-up control method described above, the heat pump water heater includes a first calculation module, which is configured to calculate according to the formula...

[0016]

[0017] Determine the preset opening degree corresponding to the first control valve.

[0018] in, This is the preset opening degree corresponding to the first control valve. For the compressor frequency, The outdoor ambient temperature where the outdoor heat exchanger is located. This refers to the actual indoor temperature at which the heat pump water heater needs to cool. The preset indoor temperature for which the heat pump water heater needs to cool. , , as well as This is the corresponding adjustment coefficient.

[0019] The start-up control method described above, wherein determining the opening degrees of the first control valve and the second control valve based on the compressor frequency and the outdoor ambient temperature where the outdoor heat exchanger is located, specifically includes:

[0020] The preset opening degree of the second control valve is determined based on the compressor frequency, the outdoor ambient temperature, the preset hot water temperature of the hot water tank, and the actual hot water temperature.

[0021] In the start-up control method described above, the heat pump water heater includes a second calculation module, which is configured to calculate according to the formula...

[0022]

[0023] Determine the preset opening degree corresponding to the second control valve.

[0024] in, This is the preset opening degree corresponding to the second control valve. For the compressor frequency, The outdoor ambient temperature where the outdoor heat exchanger is located. This refers to the actual temperature of the hot water in the hot water tank. Set the preset temperature for the hot water in the hot water tank. , , as well as This is the corresponding adjustment coefficient.

[0025] The startup control method described above, wherein determining whether the heat pump water heater meets the startup conditions in the coexistence mode based on the actual temperature of the hot water in the hot water tank and the actual cooling temperature of the heat pump water heater, specifically includes:

[0026] Based on the actual temperature of the hot water, determine whether the heat pump water heater meets the start-up conditions of the hot water mode;

[0027] Based on the actual cooling temperature, determine whether the heat pump water heater meets the start-up conditions of the cooling mode;

[0028] If the heat pump water heater simultaneously meets the start-up conditions for both the hot water mode and the cooling mode, then it is determined that the heat pump water heater meets the start-up conditions for the coexistence mode.

[0029] The start-up control method described above, wherein determining whether the heat pump water heater meets the start-up conditions of the hot water mode based on the actual temperature of the hot water, specifically includes:

[0030] If the actual temperature of the hot water is less than or equal to the difference between the preset temperature of the hot water in the hot water tank and the hysteresis temperature of the hot water in the hot water tank, then the heat pump water heater is determined to meet the start-up conditions of the hot water mode.

[0031] The step of determining whether the heat pump water heater meets the start-up conditions of the cooling mode based on the actual cooling temperature specifically includes:

[0032] If the actual cooling temperature is greater than or equal to the sum of the preset room temperature of the indoor heat exchanger and the cooling hysteresis temperature of the indoor heat exchanger, then the heat pump water heater is determined to meet the start-up conditions of the cooling mode.

[0033] As described above, in the start-up control method, the heat pump water heater includes a throttling valve assembly. The indoor heat exchanger, the outdoor heat exchanger, and the hot water heat exchanger are respectively connected to the compressor and the two ends of the throttling valve assembly to form different heat exchange circuits. The heat exchange circuit includes a refrigeration circuit, a hot water circuit, and a refrigeration-heating water circuit. The refrigeration circuit includes the compressor, the outdoor heat exchanger, and the indoor heat exchanger that are interconnected. The hot water circuit includes the compressor, the outdoor heat exchanger, and the hot water heat exchanger that are interconnected.

[0034] As described above, in the start-up control method, the control valve assembly includes a four-way reversing valve, an electric control valve, and a third control valve. The compressor is connected to the indoor heat exchanger, the outdoor heat exchanger, and the hot water heat exchanger respectively through the four-way reversing valve. The electric control valve is connected between the four-way reversing valve and the indoor heat exchanger. The third control valve is connected between the first control valve and the indoor heat exchanger, and between the first control valve and the indoor heat exchanger.

[0035] As described above, before controlling the opening degrees of the first control valve and the second control valve, the start-up control method further includes:

[0036] Control the switching of the four-way directional valve and control the electric control valve and the third control valve to open to preset opening values ​​respectively.

[0037] The startup control method described above,

[0038] If the heat pump water heater does not meet the start-up conditions in the coexistence mode, then the start-up order of the hot water mode and the cooling mode in the heat pump water heater when started individually is determined.

[0039] If the startup sequence prioritizes the hot water mode, then the first control valve and the second control valve are opened to their respective hot water startup opening degrees.

[0040] The start-up control method described above, wherein if the start-up sequence prioritizes the hot water mode, then the second control valve is opened to the hot water start-up opening degree, the start-up control method further includes:

[0041] After the heat pump water heater is shut down to a steady state, the start-up conditions of the heat pump water heater in coexistence mode are re-determined based on the actual temperature.

[0042] If the heat pump water heater meets the start-up conditions corresponding to the coexistence mode, the first control valve and the second control valve are controlled to open to the preset opening degree respectively, and after the cooling and heating water circuit is continuously conducted at the preset opening degree for a time greater than or equal to the preset time threshold, the heat pump water heater is restarted.

[0043] If the startup control method described above prioritizes the cooling mode, then the first control valve is opened to the cooling startup opening, while the second control valve is maintained at the standby opening.

[0044] In the startup control method described above, if the startup sequence prioritizes the cooling mode, then the first control valve is opened to the cooling startup opening degree, and the second control valve is maintained at the standby opening degree. The startup control method further includes:

[0045] Re-determine whether the heat pump water heater meets the start-up conditions in coexistence mode based on the actual temperature;

[0046] If the heat pump water heater meets the start-up conditions corresponding to the coexistence mode, the second control valve is controlled to open to the preset opening degree, and after the cooling and heating water circuit is continuously conducted at the preset opening degree for a time greater than or equal to a preset time threshold, the heat pump water heater is restarted.

[0047] The start-up control method for a heat pump water heater provided in this application firstly determines whether the heat pump water heater meets the start-up conditions of the corresponding coexistence mode. This allows for control of each valve in the control valve assembly when the start-up conditions for the coexistence mode are met. Secondly, the first and second control valves of the control valve assembly are opened to preset opening degrees, enabling the cooling circuit to be connected at the first control valve and the hot water circuit at the second control valve. This ensures both the cooling and hot water production functions of the heat pump water heater while also distributing the cooling and hot water production capacity through the first and second control valves. Finally, after the hot water circuit and cooling circuit remain connected at the preset opening degrees for a time greater than or equal to a preset time threshold, the heat pump water heater can start up in a relatively stable state, ensuring stable and reliable operation during the start-up process in coexistence mode.

[0048] Secondly, embodiments of this application provide a heat pump water heater, which employs the start-up control method for heat pump water heaters as described in any of the preceding claims.

[0049] Thirdly, embodiments of this application provide a storage medium storing computer execution instructions, which, when executed by a processor, are used to implement the start-up control method for a heat pump water heater as described in any of the preceding claims.

[0050] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that the heat pump water heater start-up control method, the heat pump water heater and the storage medium provided by the embodiments of this application can solve, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of the structure of a heat pump water heater provided in an embodiment of this application;

[0053] Figure 2 This is a schematic diagram of another heat pump water heater provided in an embodiment of this application;

[0054] Figure 3 A flowchart illustrating a start-up control method for a heat pump water heater provided in an embodiment of this application;

[0055] Figure 4 A schematic diagram of the startup adjustment determination process for a heat pump water heater provided in an embodiment of this application;

[0056] Figure 5 A flowchart illustrating another start-up control method for a heat pump water heater provided in an embodiment of this application;

[0057] Figure 6 This is a flowchart illustrating another start-up control method for a heat pump water heater provided in an embodiment of this application.

[0058] Figure label:

[0059] 100 - Compressor;

[0060] 200-Outdoor heat exchanger;

[0061] 300 - Indoor heat exchanger;

[0062] 310 - Inlet;

[0063] 320 - Outlet;

[0064] 330 - Second temperature sensor;

[0065] 400-Hot water heat exchanger;

[0066] 500-Hot water tank;

[0067] 510 - First temperature sensor;

[0068] 600 - Control valve assembly;

[0069] 610 - First control valve;

[0070] 620 - Second control valve;

[0071] 630 - Third control valve;

[0072] 640 - Four-way directional valve;

[0073] 650 - Electric control valve;

[0074] 660 - Fourth control valve;

[0075] 700 - Throttling valve assembly;

[0076] 800-fan. Detailed Implementation

[0077] As described in the background section, traditional air source heat pump water heaters typically only provide hot water, while indoor cooling and heating are usually handled by cooling and heating equipment such as air conditioners. However, neither traditional air source heat pump water heaters nor cooling and heating equipment operate at full capacity 24 hours a day; both have periods of inactivity. This results in low equipment utilization rates for traditional air source heat pump water heaters and cooling and heating equipment. Furthermore, because traditional air source heat pump water heaters and cooling and heating equipment are two separate systems, these two separate systems occupy a significant amount of installation space, further reducing space utilization.

[0078] To address this issue, researchers have proposed a novel air-source heat pump water heater. This new model features multiple modes, including hot water production, cooling, heating, and a combination of both. This multi-functional design simultaneously meets users' needs for heating, cooling, and hot water. Compared to traditional air-source heat pump water heaters and heating / cooling systems, this not only improves equipment and energy efficiency but also reduces the installation space required, significantly enhancing space utilization.

[0079] However, the start-up control method for the new air source heat pump water heater during multi-mode operation needs further research to ensure that the new air source heat pump water heater can have better stability during multi-mode start-up.

[0080] To address the aforementioned technical problems, this application provides a start-up control method for a heat pump water heater, a heat pump water heater, and a storage medium, which can control the start-up of the heat pump water heater in multiple modes to ensure stable and reliable operation of the heat pump water heater during the start-up process in multiple modes.

[0081] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0082] Example 1

[0083] Figure 1 A schematic diagram of a heat pump water heater is shown.

[0084] See Figure 1 As shown in the illustration, this application provides a heat pump water heater, which can also be called an air source heat pump water heater. The heat pump water heater may include a cooling / heating water circuit, a hot water tank 500, and a control valve assembly 600. The cooling / heating water circuit includes a compressor 100, an outdoor heat exchanger 200, an indoor heat exchanger 300, and a hot water heat exchanger 400. The compressor 100, outdoor heat exchanger 200, and indoor heat exchanger 300 are interconnected, as are the compressor 100, hot water heat exchanger 400, and indoor heat exchanger 300. The hot water heat exchanger 400 heats the hot water tank 500, and the indoor heat exchanger 300 exchanges heat with the indoor environment, so that the cooling / heating water circuit realizes the cooling / heating water function of the heat pump water heater.

[0085] from Figure 1As can be seen, the control valve assembly 600 may include a first control valve 610 and a second control valve 620. The first control valve 610 is connected between the outdoor heat exchanger 200 and the indoor heat exchanger 300. The second control valve 620 is connected between the hot water heat exchanger 400 and the indoor heat exchanger 300. Thus, the first control valve 610 allows the compressor 100, outdoor heat exchanger 200, indoor heat exchanger 300, and compressor 100 to be connected sequentially, and the second control valve 620 allows the compressor 100, hot water heat exchanger 400, indoor heat exchanger 300, and compressor 100 to be connected sequentially, so that the compressor 100, outdoor heat exchanger 200, and indoor heat exchanger 300 are interconnected, forming a cooling and heating water circuit.

[0086] Specifically, the hot water heat exchanger 400 can be located inside the hot water tank 500. In the cooling and heating water circuit, the high-temperature and high-pressure refrigerant discharged from the compressor 100 can flow through the cooling and heating water circuit, entering the outdoor heat exchanger 200 and the hot water heat exchanger 400 respectively, then flowing through the indoor heat exchanger 300, and finally returning to the compressor 100. In the cooling and heating water circuit, both the outdoor heat exchanger 200 and the hot water heat exchanger 400 act as condensers, while the indoor heat exchanger 300 acts as an evaporator. This allows for heat exchange between the hot water heat exchanger 400 and the water in the hot water tank 500, thereby realizing the function of the heat pump water heater in producing hot water for users. Simultaneously, through heat exchange between the indoor heat exchanger 300 and the indoor environment, the heat pump water heater absorbs heat from the indoor environment, thus realizing its cooling function.

[0087] Each function achievable by a heat pump water heater corresponds to one of its operating modes. Therefore, heat pump water heaters typically have multiple operating modes. These modes can include, but are not limited to, cooling mode, heating mode, hot water mode, and a combination mode (i.e., multiple modes). The combination mode can include, but is not limited to, a mode where hot water and cooling modes coexist, or a mode where heating and hot water modes coexist.

[0088] Figure 2 This diagram illustrates the structure of another type of heat pump water heater.

[0089] refer to Figure 2As shown, the heat pump water heater also includes a throttling valve assembly 700. An indoor heat exchanger 300, an outdoor heat exchanger 200, and a hot water heat exchanger 400 are respectively connected to the compressor 100 and the two ends of the throttling valve assembly 700 to form different heat exchange circuits. These heat exchange circuits can include, but are not limited to, a refrigeration circuit, a hot water circuit, and a cooling / heating water circuit. Specifically, the refrigeration circuit includes the compressor 100, the outdoor heat exchanger 200, and the indoor heat exchanger 300, which are interconnected. The hot water circuit includes the compressor 100, the outdoor heat exchanger 200, and the hot water heat exchanger 400, which are interconnected. The outdoor heat exchanger 200 and the hot water heat exchanger 400 are connected in parallel between the compressor 100 and the throttling valve assembly 700 in the cooling / heating water circuit to achieve the heating and cooling functions of the heat pump water heater.

[0090] It should be noted that the throttle valve assembly 700 can coexist with the control valve assembly 600 in the heat pump water heater, so that the throttle valve assembly 700 can better throttle and reduce the pressure of the medium such as refrigerant flowing in the heat exchange circuit. The structure of the throttle valve assembly 700 and its connection in the heat pump water heater can be found in relevant descriptions of heat pump water heaters in the art, and will not be further elaborated upon in this embodiment.

[0091] Alternatively, some valve bodies in the control valve assembly 600 can also serve as throttling components, such as the first control valve 610 and the third control valve 630. In this embodiment, the heat pump water heater can achieve throttling through the first control valve 610 in hot water mode, and through the third control valve 630 in cooling mode or cooling and heating water mode.

[0092] The valve body in the control valve assembly 600 is connected to different heat exchange circuits so that the heat pump heat exchanger can control the connection status of each heat exchange circuit by controlling the control valve assembly 600, so that the indoor heat exchanger 300, the outdoor heat exchanger 200 and the hot water heat exchanger 400 can exchange heat in pairs, so as to realize the cooling, heating or hot water production function of the heat pump water heater.

[0093] from Figure 2As can be seen, the control valve assembly 600 also includes a four-way reversing valve 640, an electric control valve 650, and a third control valve 630. The compressor 100 is connected to the indoor heat exchanger 300, the outdoor heat exchanger 200, and the hot water heat exchanger 400 respectively through the four-way reversing valve 640. Specifically, the four-way reversing valve 640 can include four openings. While the first and second ends of the compressor 100 can be connected through the four-way reversing valve 640, the indoor heat exchanger 300, the outdoor heat exchanger 200, and the hot water heat exchanger 400 can also be connected to the first end of the compressor 100 through the four-way reversing valve 640. In this way, the heat pump water heater can realize the connection of different heat exchange circuits by controlling the four-way reversing valve 640, thereby realizing the cooling, heating, or hot water production functions of the heat pump water heater.

[0094] refer to Figure 2 As shown, the electric control valve 650 is connected between the four-way reversing valve 640 and the indoor heat exchanger 300, so that the compressor 100 can sequentially pass through the four-way reversing valve 640 and the electric control valve 650 to the indoor heat exchanger 300. This allows the compressor 100, indoor heat exchanger 300, and third control valve 630 to be connected between the first control valve 610 and the indoor heat exchanger 300, and between the second control valve 620 and the indoor heat exchanger 300, so that the indoor heat exchanger 300 can be connected to the outdoor heat exchanger 200. Thus, the control valve assembly 600 enables the compressor 100, indoor heat exchanger 300, and outdoor heat exchanger 200 to be sequentially connected, allowing them to communicate with each other and form a refrigeration circuit.

[0095] In the refrigeration circuit, the high-temperature, high-pressure refrigerant discharged from the compressor 100 first passes through the outdoor heat exchanger 200, then flows along the refrigeration circuit through the indoor heat exchanger 300 before returning to the compressor 100. The outdoor heat exchanger 200 acts as a condenser in the refrigeration circuit, while the indoor heat exchanger 300 acts as an evaporator. This allows for heat exchange between the indoor heat exchanger 300 and the indoor environment, absorbing heat from the indoor environment and achieving the cooling function of the heat pump water heater.

[0096] It should be noted that, depending on the path of the gas discharged from the first end of the compressor 100, this refrigeration circuit can also be used as a heating circuit.

[0097] At the same time, from Figure 2As shown, the third control valve 630 can also be connected between the second control valve 620 and the indoor heat exchanger 300, so that the hot water heat exchanger 400 is connected to the indoor heat exchanger 300 in sequence through the second control valve 620 and the third control valve 630. In this way, the control valve assembly 600 can realize the sequential connection of the compressor 100, the indoor heat exchanger 300, the hot water heat exchanger 400, and the compressor 100, so that the compressor 100, the hot water heat exchanger 400, and the indoor heat exchanger 300 are interconnected, so as to form a cooling and heating circuit together with the outdoor heat exchanger 200.

[0098] In some embodiments, the compressor 100 can be sequentially connected to the hot water heat exchanger 400, the outdoor heat exchanger 200, and the compressor 100 via a four-way reversing valve 640, an electric control valve 650, a second control valve 620, and a third control valve 630, so that the compressor 100, the outdoor heat exchanger 200, and the hot water heat exchanger 400 are interconnected to form a heating circuit. In the heating circuit, the high-temperature, high-pressure refrigerant discharged from the compressor 100 first passes through the hot water heat exchanger 400 in the hot water circuit, then flows along the hot water circuit through the outdoor heat exchanger 200, and finally returns to the compressor 100. The outdoor heat exchanger 200 can act as an evaporator in the hot water circuit, and the hot water heat exchanger 400 can act as a condenser in the hot water circuit, so that the hot water heat exchanger 400 can exchange heat with the water in the hot water tank 500, thereby realizing the function of a heat pump water heater and producing hot water for users.

[0099] It should be noted that, from Figure 1 and Figure 2 As can be seen from the diagram, the heat pump water heater may also include an economizer, and the control valve assembly 600 may further include a fourth control valve 660. The economizer is connected between the first control valve 610 and the compressor 100, and the fourth control valve 660 is connected between the first control valve 610 and the economizer. The first control valve 610 may also be called the main valve, the second control valve 620 may also be called the hot water valve, the third control valve 630 may also be called the heating valve, and the fourth control valve 660 may also be called the auxiliary valve. Specifically, the roles of the economizer and the fourth control valve 660 in the heat pump water heater can be found in the descriptions in related technologies, and will not be further elaborated in this embodiment.

[0100] The starting control method of a heat pump water heater will be further explained below with reference to the accompanying drawings and the structure of the heat pump water heater.

[0101] The heat pump water heater also includes a fan 800 and a circulating water pump. The fan 800 can be located to the side of the outdoor heat exchanger 200 to enhance heat transfer between the outdoor heat exchanger 200 and the outdoor air. The circulating water pump can be located at the inlet 310 of the indoor heat exchanger 300. For example, the outdoor heat exchanger 200 can be, but is not limited to, a finned heat exchanger, and the indoor heat exchanger 300 can be, but is not limited to, a water-side heat exchanger. The water-side heat exchanger can include an inlet 310 and an outlet 320, and the circulating water pump can be located at the inlet 310 of the water-side heat exchanger.

[0102] Figure 3 A flowchart illustrating a start-up control method for a heat pump water heater is shown.

[0103] refer to Figure 3 As shown, the start-up control method for heat pump water heaters includes:

[0104] Step S100: Detect the actual temperature corresponding to the heat pump water heater, and determine whether the heat pump water heater meets the start-up conditions in the coexistence mode based on the actual temperature. The actual temperature includes the actual temperature of the hot water in the hot water tank and the actual cooling temperature of the heat pump water heater. The coexistence mode is a mode in which hot water mode and cooling mode coexist.

[0105] It should be noted that in this embodiment, the actual temperature of the hot water in the hot water tank 500 and the actual cooling temperature of the heat pump water heater are used to determine whether the heat pump water heater meets the start-up conditions in the coexistence mode. This allows the heat pump water heater to control the control valve assembly 600 according to different modes, thereby enabling the conduction of different heat exchange circuits in the heat pump water heater.

[0106] Figure 4 This diagram illustrates the process of determining the start-up and adjustment of a heat pump water heater.

[0107] refer to Figure 4 As shown, in step S100, based on the actual temperature of the hot water in the hot water tank and the actual cooling temperature of the heat pump water heater, it is determined whether the heat pump water heater meets the start-up conditions in the coexistence mode, specifically including:

[0108] Step S110: Determine whether the heat pump water heater meets the start-up conditions for hot water mode based on the actual temperature of the hot water.

[0109] Step S120: Determine whether the heat pump water heater meets the start-up conditions for cooling mode based on the actual cooling temperature;

[0110] Step S130: If the heat pump water heater simultaneously meets the start-up conditions for both hot water mode and cooling mode, then it is determined that the heat pump water heater meets the start-up conditions for coexistence mode.

[0111] Specifically, in step S110, based on the actual temperature of the hot water, it is determined whether the heat pump water heater meets the start-up conditions for the hot water mode, which may include:

[0112] If the actual hot water temperature is less than or equal to the difference between the preset hot water temperature of hot water tank 500 and the hot water hysteresis temperature of hot water tank 500, then the heat pump water heater is determined to meet the start-up conditions for hot water mode.

[0113] It should be noted that a first temperature sensor 510 may be installed in the hot water tank 500 to detect the actual temperature of the hot water in the tank. This allows the heat pump water heater to obtain the actual temperature of the hot water for determining the start-up adjustment of the hot water mode. The number of first temperature sensors 510 in the hot water tank 500 may include, but is not limited to, one or more, such as two. The two first temperature sensors 510 may be distributed in different parts of the hot water tank 500; for example, one may be located at the top of the tank, and the other at the bottom. This allows for more accurate measurement of the liquid temperature in the hot water tank 500, enabling precise determination of the start-up conditions of the heat pump water heater.

[0114] It should be understood that the hot water hysteresis temperature and the preset hot water temperature are known quantities. The hot water hysteresis temperature can be understood as the difference between the supply water temperature and the return water temperature in the hot water tank 500. Due to the influence of the hot water hysteresis temperature, the temperature in the hot water tank 500 may decrease. Therefore, by using the actual hot water temperature, the hot water hysteresis temperature, and the preset hot water temperature, it is possible to determine the start-up adjustment of the hot water mode of the heat pump water heater, so as to determine whether the heat pump water heater simultaneously meets the start-up conditions of both the hot water mode and the cooling mode.

[0115] Specifically, step S120 determines whether the heat pump water heater meets the start-up conditions for cooling mode based on the actual cooling temperature, which may include:

[0116] If the actual cooling temperature is greater than or equal to the sum of the preset room temperature of the indoor heat exchanger 300 and the cooling hysteresis temperature of the indoor heat exchanger 300, then the heat pump water heater is determined to meet the start-up conditions of the cooling mode.

[0117] It should be noted that the actual cooling temperature can be detected by the second temperature sensor 330. The second temperature sensor 330 can be installed inside the indoor heat exchanger 300, so that the heat pump water heater can determine the actual cooling temperature of the heat pump water heater by obtaining the temperature of the liquid inside the indoor heat exchanger 300 through the second temperature sensor 330, which is used to determine the start-up adjustment of the heat pump water heater in cooling mode. Alternatively, the second temperature sensor 330 can be located outside the indoor heat exchanger 300 to directly detect changes in the ambient temperature of the room where the indoor heat exchanger 300 is located during the heat pump water heater's cooling mode. These changes in ambient temperature directly reflect the cooling effect of the heat pump water heater. The indoor environment after the heat pump water heater has cooled can be understood as the actual cooling temperature. In this embodiment, the location and number of the second temperature sensor 330 are not further limited.

[0118] It should be understood that the preset room temperature and cooling hysteresis temperature are known quantities. The cooling hysteresis temperature can be understood as the difference between the supply water temperature and the return water temperature in the indoor heat exchanger 300. Due to the influence of the cooling hysteresis temperature, the cooling effect of the heat pump water heater may be affected. Therefore, by using the actual cooling temperature, the preset room temperature, and the cooling hysteresis temperature, the start-up adjustment of the cooling mode of the heat pump water heater can be determined.

[0119] It should be noted that this embodiment can determine whether the heat pump water heater simultaneously meets the start-up conditions of both the hot water mode and the cooling mode based on the judgment results of the start-up conditions of the hot water mode and the cooling mode. This enables accurate judgment of the start-up timing of the hot water mode, cooling mode, and coexistence mode of the heat pump water heater. When it is determined that the heat pump water heater meets the start-up conditions of the corresponding coexistence mode, the valves in the control valve assembly 600 can be controlled to realize the functions of hot water production, cooling, or cooling plus hot water production of the heat pump water heater.

[0120] refer to Figure 3 As shown, the start-up control method for heat pump water heaters also includes:

[0121] Step S200: If the heat pump water heater meets the start-up conditions of the corresponding coexistence mode, then control the first control valve and the second control valve to open to the preset opening degree respectively;

[0122] Step S300: After the hot water circuit and the cooling circuit have been continuously conducting at the preset opening degree for a time greater than or equal to the preset time threshold, the heat pump water heater is started.

[0123] It should be noted that after determining that the heat pump water heater meets the start-up conditions for the corresponding coexistence mode, the first control valve 610 and the second control valve 620 in the control valve assembly 600 are opened to preset opening degrees respectively. This ensures that the cooling and heating water circuits are connected at the first control valve 610 and the second control valve 620, connecting the outdoor heat exchanger 200 and the hot water heat exchanger 400 to the indoor heat exchanger 300. This helps to ensure that the cooling and heating water circuits are in a conductive state, ensuring the cooling and hot water production functions of the heat pump water heater while also enabling the first control valve 610 to open. The pressure drop generated by the second control valve 620 and the second control valve 620 respectively enables the distribution of refrigerant between the outdoor heat exchanger 200 and the hot water heat exchanger 400 of the heat pump water heater, thereby achieving the purpose of distributing the cooling capacity and hot water production capacity of the heat pump water heater. Finally, by ensuring that the hot water circuit and the cooling circuit are continuously connected at a preset opening degree for a time greater than or equal to a preset time threshold, the heat pump water heater has a transition phase during the start-up process, ensuring that the heat pump water heater can start in a relatively stable state, thus giving the heat pump water heater strong stability and reliability when starting in coexistence mode.

[0124] For example, the preset time threshold may include, but is not limited to, 5 seconds.

[0125] In some embodiments, step S200, controlling the first control valve 610 and the second control valve 620 to open to preset opening degrees, may specifically include:

[0126] Adjust the opening degree of the first control valve 610 and the second control valve 620 to the maximum opening degree.

[0127] It should be noted that by adjusting the opening degree of the first control valve 610 and the second control valve 620 to the maximum opening degree, the control of the first control valve 610 and the second control valve 620 during the start-up process of the heat pump water heater can be simplified, so that the heat pump water heater has strong stability and reliability when starting in coexistence mode.

[0128] To achieve energy distribution during the operation of the heat pump water heater, in this embodiment, after the heat pump water heater starts up and operates in coexistence mode, it is necessary to control the opening degrees of the first control valve 610 and the second control valve 620 again according to the energy demands of cooling and hot water modes to distribute the energy of the heat pump water heater on demand, so as to meet the needs of cooling and hot water volume in coexistence mode. In this embodiment, the control of the opening degrees of the first control valve 610 and the second control valve 620 during the operation of the heat pump water heater in coexistence mode is not further elaborated; for details, please refer to the description in related technologies.

[0129] Alternatively, in some other embodiments, in step S200, controlling the first control valve 610 and the second control valve 620 to open to a preset degree may specifically include:

[0130] Based on the frequency of the compressor 100 and the outdoor ambient temperature where the outdoor heat exchanger 200 is located, the preset opening degree corresponding to the first control valve 610 and the second control valve 620 is determined respectively, and the opening degree of the first control valve 610 and the second control valve 620 is adjusted to the preset opening degree.

[0131] It should be noted that, during the determination of the preset opening degree corresponding to the first control valve 610 and the second control valve 620, the preset opening degree corresponding to the first control valve 610 and the second control valve 620 can be fitted according to the frequency of the compressor 100 and the outdoor ambient temperature where the outdoor heat exchanger 200 is located. Through the pressure drop generated by the preset opening degree corresponding to the first control valve 610 and the second control valve 620, the refrigerant in the heat pump heat exchanger is reasonably distributed in the outdoor heat exchanger 200 and the hot water heat exchanger 400. While ensuring the stability and reliability of the heat pump water heater startup, this embodiment enables the heat pump water heater to quickly meet the energy distribution requirements of hot water production and cooling capacity when the heat pump water heater is running in coexistence mode after temperature startup, so as to meet the user's needs for indoor temperature and hot water.

[0132] In this embodiment, the opening degrees of the first control valve 610 and the second control valve 620 are determined according to the frequency of the compressor 100 and the outdoor ambient temperature where the outdoor heat exchanger 200 is located, respectively. Specifically, this may include:

[0133] The preset opening degree of the first control valve 610 is determined based on the frequency of the compressor 100, the outdoor ambient temperature, the preset indoor temperature of the indoor heat exchanger 300, and the actual indoor temperature.

[0134] In this way, the heat pump water heater can fit the preset opening degree of the first control valve 610 to the frequency of the compressor 100, the outdoor ambient temperature, the indoor preset temperature, and the actual indoor temperature. This ensures that during the start-up process, the heat pump water heater can meet the cooling capacity required for operation, quickly reaching the indoor preset temperature to satisfy the user's temperature needs. It should be noted that the heat pump water heater may include a controller, which can be electrically connected to the first temperature sensor 510, the second temperature sensor 330, and the control valve assembly 600. The controller can acquire the temperatures detected by the first and second temperature sensors 510 and 330, and determine whether the heat pump water heater meets the start-up conditions for the corresponding coexistence mode based on these temperatures. This allows the controller to control the opening degree of each valve in the control valve assembly 600, thereby controlling the connection of each heat exchange circuit and simultaneously distributing the refrigerant between the outdoor heat exchanger 200 and the hot water heat exchanger 400 during start-up in coexistence mode.

[0135] The heat pump water heater may include a first calculation module, which is configured to calculate according to the formula

[0136] (Formula 1)

[0137] Determine the preset opening degree corresponding to the first control valve 610.

[0138] in, This is the preset opening degree corresponding to the first control valve 610. For the compressor frequency of 100, The ring represents the outdoor ambient temperature at which the outdoor heat exchanger 200 is located. This refers to the actual indoor temperature at which the heat pump water heater needs to cool. The preset indoor temperature is required for the heat pump water heater to cool the room. , , as well as This is the corresponding adjustment coefficient.

[0139] It should be noted that the first calculation module can be electrically connected to the controller, and the controller can be configured to control the first calculation module to determine the preset opening degree corresponding to the first control valve 610 according to Formula 1. In this embodiment, this is achieved by adjusting the coefficient. , , as well as The setting allows for adjustment of the preset opening degree of the first control valve 610, so that the cooling capacity required by the heat pump water heater during startup can be better met, thereby saving the running time of the heat pump water heater in reaching the preset indoor temperature and enabling it to reach the preset indoor temperature more quickly.

[0140] In this embodiment, the opening degree of the first control valve 610 and the second control valve 620 is determined based on the frequency of the compressor 100 and the outdoor ambient temperature where the outdoor heat exchanger 200 is located. Specifically, this may include:

[0141] The preset opening degree of the second control valve 620 is determined based on the frequency of the compressor 100, the outdoor ambient temperature, the preset hot water temperature of the hot water tank 500, and the actual hot water temperature.

[0142] In this way, the heat pump water heater can fit the preset opening degree of the second control valve 620 by the frequency of the compressor 100, the outdoor ambient temperature, the preset hot water temperature, and the actual hot water temperature. This allows the heat pump water heater to meet the required amount of hot water during operation and reach the actual hot water temperature more quickly, thus satisfying the user's demand for hot water.

[0143] The heat pump water heater may further include a second calculation module, which is configured to calculate according to the formula

[0144] (Formula 2)

[0145] Determine the preset opening degree corresponding to the second control valve 620.

[0146] in, This corresponds to the preset opening degree of the second control valve 620. For the compressor frequency of 100, The outdoor ambient temperature at which the outdoor heat exchanger 200 is located. This represents the actual temperature of the hot water in the 500ml hot water tank. Set the preset temperature for the 500ml hot water in the hot water tank. , , as well as This is the corresponding adjustment coefficient.

[0147] It should be noted that the second calculation module can be electrically connected to the controller, and the controller can be configured to control the second calculation module to determine the preset opening degree corresponding to the second control valve 620 according to Formula 2. In this embodiment, this is achieved by adjusting the coefficient. , , as well as The setting allows for adjustment of the preset opening degree of the second control valve 620, so that the heat pump water heater can better meet the hot water production requirements during operation when it starts up, thereby saving the operating time of the heat pump water heater when it reaches the preset hot water temperature and enabling it to reach the preset hot water temperature more quickly.

[0148] It should be noted that in some embodiments, the first calculation module can be used instead of the second calculation module to determine the preset opening degree of the second control valve 620 according to Formula 2. In this embodiment, for the heat pump heat exchanger and the adjustment coefficient... , , , , as well as The specific value is not further limited.

[0149] Before controlling the opening degree of the first control valve 610 and the second control valve 620 in step S200, the start control method may further include:

[0150] Control the switching of the four-way directional valve 640 and control the electric control valve 650 and the third control valve 630 to open to the preset opening value respectively.

[0151] Specifically, after determining that the heat pump water heater meets the start-up conditions in the coexistence mode, before controlling the opening degree of the first control valve 610 and the second control valve 620, the controller can also control the reversing of the four-way reversing valve 640 and control the electric control valve 650 and the third control valve 630 to open to preset opening values ​​respectively. Specifically, the controller can energize the four-way reversing valve 640 and control the electric control valve 650 to open to a preset opening value (e.g., fully open) to connect the compressor 100 to the outdoor heat exchanger 200, the indoor heat exchanger 300, and the hot water heat exchanger 400 respectively. Simultaneously, the controller can also control the third control valve 630 to open to a preset opening value to control the refrigerant entering the indoor heat exchanger 300 through the outdoor heat exchanger 200 and the hot water heat exchanger 400, thereby achieving the purpose of controlling the suction superheat of the indoor heat exchanger 300.

[0152] It should be noted that when the heat pump water heater is started in coexistence mode, the controller can keep the fourth control valve 660 fully closed to prevent the fourth control valve 660 from affecting the cooling and hot water functions of the heat pump water heater.

[0153] After determining that the heat pump water heater meets the start-up conditions in coexistence mode, and before controlling the opening degree of the first control valve 610 and the second control valve 620, the start-up control method further includes:

[0154] The control valve assembly 600 is connected to the reset of each valve body in the cooling and heating water circuit.

[0155] Specifically, after determining that the heat pump water heater meets the start-up conditions in the coexistence mode, before controlling the opening degree of the first control valve 610 and the second control valve 620, the controller can control the first control valve 610, the second control valve 620, the third control valve 630, the four-way reversing valve 640 and the electric control valve 650 to reset. In this way, after the first control valve 610, the second control valve 620, the third control valve 630, the four-way reversing valve 640 and the electric control valve 650 are reset, the heat pump water heater can be kept in standby mode.

[0156] The control method further includes, after the control valve assembly 600 is reset and before controlling the opening of the first control valve 610 and the second control valve 620, the activation control method after resetting each valve body connected to the cooling / heating water circuit, and before controlling the opening of the first control valve 610 and the second control valve 620.

[0157] Determine the start-up sequence of the circulating water pump, compressor 100, and fan 800 in the heat pump water heater.

[0158] It should be noted that the controller can determine the starting rotation of the fan 800 based on the operating mode of the heat pump water heater and the outdoor ambient temperature where the outdoor heat exchanger 200 is located. When the heat pump water heater starts in cooling or heating mode, the controller can control the compressor 100 to start only after the circulating water pump turns on and the water flow switch in the heat pump water heater is activated. Specifically, the starting sequence of the circulating water pump, compressor 100, and fan 800 can be referred to the relevant descriptions of heat pump water heaters in related technologies, and is not further limited in this embodiment.

[0159] Figure 5 A flowchart illustrating a start-up control method for a heat pump water heater is shown.

[0160] refer to Figure 5 As shown, the start-up control method for a heat pump water heater may also include:

[0161] Step S400: If the heat pump water heater does not meet the start-up conditions in the coexistence mode, then determine the start-up order of the hot water mode and the cooling mode in the heat pump water heater when started individually.

[0162] It should be noted that if the heat pump water heater cannot simultaneously meet the start-up conditions for both hot water mode and cooling mode, then it can be confirmed that the heat pump water heater does not meet the start-up conditions for the coexistence mode. Whether the heat pump water heater meets the start-up conditions for both hot water mode and cooling mode can be referred to the relevant descriptions in steps S110 and S120 above, and will not be elaborated further here.

[0163] When it is confirmed that the heat pump water heater does not meet the start-up conditions in coexistence mode, the heat pump water heater can first start in hot water mode and then in cooling mode, or vice versa. Accordingly, the start-up order of hot water mode and cooling mode when started separately in a heat pump water heater can include either hot water mode starting first or cooling mode starting first.

[0164] refer to Figure 5 As shown, the start-up control method for a heat pump water heater may also include:

[0165] Step S500a: If the startup sequence is hot water mode priority startup, then control the first control valve and the second control valve to open to the corresponding hot water startup opening degree respectively.

[0166] It should be noted that, in some embodiments, the controller can also adjust the hot water start-up opening corresponding to the first control valve 610 by controlling the opening degree of the first control valve 610, thereby controlling the suction superheat of the refrigerant entering the outdoor heat exchanger 200. The hot water start-up opening corresponding to the second control valve 620 may include, but is not limited to, being fully open. The controller can control the second control valve 620 to be fully open so that the hot water heat exchanger 400 is connected to the outdoor heat exchanger 200.

[0167] To ensure the continuity of the hot water circuit, the controller can also control the four-way reversing valve 640 to switch the compressor 100 to be connected to the hot water heat exchanger 400 and the indoor heat exchanger 300 respectively, while keeping them disconnected. At the same time, the controller controls the electric control valve 650 and the fourth control valve 660 to remain fully closed. While forming a hot water circuit consisting of the compressor 100, the hot water heat exchanger 400, the outdoor heat exchanger 200 and the compressor assembly, it can prevent the refrigerant discharged from the compressor 100 from entering the indoor heat exchanger 300, thereby increasing the hot water production capacity of the heat pump water heater.

[0168] Meanwhile, in order to facilitate the discharge of refrigerant that may accidentally enter the indoor heat exchanger 300, the controller can also control the third control valve 630 to open to a small degree (e.g., 10%) so that the refrigerant in the indoor heat exchanger 300 can enter the hot water circuit.

[0169] It should be noted that, before the first control valve 610 and the second control valve 620 are opened to their respective hot water start-up positions, the start-up control method for the heat pump water heater may also include:

[0170] The control valve assembly 600 is connected to the reset of each valve body in the cooling and heating water circuit so that the heat pump water heater remains in standby mode.

[0171] Specifically, the method for resetting the various valve bodies connected to the control valve assembly 600 in the cooling and heating water circuit can be referred to the relevant descriptions above, and will not be elaborated further here.

[0172] The start-up control method further includes the following steps: After the control valve assembly 600 is reset and connected to each valve body in the cooling / heating water circuit, before the first control valve 610 and the second control valve 620 are opened to their respective hot water start-up degrees:

[0173] Determine the start-up sequence of the circulating water pump, compressor 100, and fan 800 in the heat pump water heater.

[0174] It should be noted that the method for determining the starting sequence of the circulating water pump, compressor 100, and fan 800 in a heat pump water heater can be found in the relevant descriptions above, and will not be elaborated further here. Figure 5 As shown, if the startup sequence prioritizes hot water mode, then after opening the second control valve 620 to the hot water startup opening degree, the startup control method may also include:

[0175] Step S600: Re-determine whether the heat pump water heater meets the start-up conditions in coexistence mode based on the actual temperature;

[0176] Step S700a: If the heat pump water heater meets the start-up conditions of the corresponding coexistence mode, after the heat pump water heater is stopped to a steady state, the first control valve and the second control valve are opened to preset opening degrees respectively, and after the cooling and heating water circuit is continuously conducted at the preset opening degree for a time greater than or equal to the preset time threshold, the heat pump water heater is restarted.

[0177] It should be noted that while the heat pump water heater is operating in hot water mode, it may also meet the conditions for starting in cooling mode. Therefore, after the heat pump water heater has been running in hot water mode for a period of time, the controller can re-determine whether the heat pump water heater meets the starting conditions for coexistence mode based on the actual temperature. This allows the heat pump water heater to be restarted when the corresponding coexistence mode starting conditions are met.

[0178] Once the heat pump water heater has stopped and met the restart adjustment requirements, it can be considered that the heat pump water heater has stopped to a steady state. Restart adjustment may include, but is not limited to, a preset time or more after the compressor has stopped. For example, the preset time may include, but is not limited to, 3 minutes.

[0179] After the heat pump water heater is shut down to a steady state, it can be restarted according to the start-up conditions required for coexistence mode. Since the outdoor heat exchanger 200 acts as an evaporator in the hot water circuit and a condenser in the cooling / heating water circuit to achieve the cooling function of the heat pump water heater, in this embodiment, compared to directly controlling the control valve assembly 600 to switch the heat pump water heater from the hot water circuit to the cooling / heating water circuit via the controller, restarting the heat pump water heater after it has been shut down to a steady state and then according to the start-up conditions required for coexistence mode allows each valve body in the control valve assembly 600 to reset before controlling the control valve assembly 600. This simplifies the controller's control process for the control valve assembly 600, resulting in greater stability and reliability for the heat pump water heater during startup in coexistence mode.

[0180] Figure 6 This is a flowchart illustrating another start-up control method for a heat pump water heater provided in an embodiment of this application.

[0181] refer to Figure 6 As shown, the start-up control method for a heat pump water heater may also include:

[0182] Step S500b: If the startup sequence is cooling mode first, then control the first control valve to open to the cooling start opening, and keep the second control valve at the standby opening.

[0183] It should be noted that the cooling start opening of the first control valve 610 can be, but is not limited to, fully open. The controller can control the first control valve 610 to be fully open so that the outdoor heat exchanger 200 can be connected to the indoor heat exchanger 300. To ensure the continuity of the refrigeration circuit, the controller can also control the four-way reversing valve 640 to remain energized and reverse, connecting the compressor 100 to the outdoor heat exchanger 200 and the indoor heat exchanger 300 respectively, while controlling the electric control valve 650 to remain fully open, controlling the third control valve 630 to open to a preset opening value, and controlling the fourth control valve 660 to remain fully closed. While forming a refrigeration circuit consisting of the compressor 100, the outdoor heat exchanger 200, the indoor heat exchanger 300, and the compressor assembly, this prevents the refrigerant discharged from the compressor 100 from entering the hot water heat exchanger 400, thereby improving the cooling capacity of the heat pump water heater.

[0184] At the same time, the controller can also adjust the preset opening value of the third control according to the refrigerant flowing into the indoor heat exchanger 300, so as to achieve the purpose of controlling the suction superheat of the indoor heat exchanger 300.

[0185] It should be noted that, similar to the priority start-up of heating mode, before controlling the first control valve 610 to open to the cooling start-up opening and maintaining the second control valve 620 at the standby opening, the start-up control method also includes:

[0186] The control valve assembly 600 is connected to the reset of each valve body in the cooling and heating water circuit so that the heat pump water heater remains in standby mode.

[0187] Determine the start-up sequence of the circulating water pump, compressor 100, and fan 800 in the heat pump water heater.

[0188] refer to Figure 6 As shown, if the startup sequence prioritizes cooling mode, then the first control valve 610 is opened to the cooling start-up position, and the second control valve 620 is maintained at the standby opening position. The startup control method also includes:

[0189] Step S600: Re-determine whether the heat pump water heater meets the start-up conditions in coexistence mode based on the actual temperature;

[0190] Step S700b: If the heat pump water heater meets the start-up conditions of the corresponding coexistence mode, the second control valve is opened to the preset opening degree, and the heat pump water heater is restarted after the cooling and heating water circuit is continuously conducted at the preset opening degree for a time greater than or equal to the preset time threshold.

[0191] Because the startup conditions for hot water mode may be met while the heat pump water heater is operating in cooling mode, the controller can re-determine whether the heat pump water heater meets the startup conditions for coexistence mode based on the actual temperature after running in cooling mode for a period of time. This allows the heat pump water heater to be restarted when the startup conditions for the corresponding coexistence mode are met.

[0192] It should be noted that since the outdoor heat exchanger 200 is used as a condenser in the refrigeration circuit, and in the coexistence mode, the outdoor heat exchanger 200 continues to be used as a condenser. Therefore, when the heat pump water heater is operating in the refrigeration mode, after the heat pump water heater meets the start-up conditions of the corresponding coexistence mode, there is no need to switch the role of the outdoor heat exchanger 200. It is only necessary to open the second control valve 620 from the standby opening to the hot water start-up opening through the controller, so that the compressor 100, hot water heat exchanger 400, indoor heat exchanger 300 and compressor 100 can be connected in sequence to form a refrigeration and heating water circuit together with the refrigeration circuit. This allows the heat pump water heater to restart according to the start-up control method in the coexistence mode, and also simplifies the restart process of the heat pump water heater, making the heat pump water heater have strong stability and reliability when starting in the coexistence mode.

[0193] For example, the preset opening degree of the second control valve 620 in step S700b may include, but is not limited to, being fully open.

[0194] It should be noted that after step S700b, during the operation of the heat pump water heater, the opening degree of the first control valve 610 and the second control valve 620 can be adjusted according to the requirements of hot water production and cooling capacity.

[0195] Based on the above embodiments, this application provides a heat pump water heater that employs the aforementioned start-up control method. It should be noted that the specific process of the heat pump water heater start-up control method has been described in detail above and will not be repeated here. Furthermore, since the heat pump water heater adopts all the technical solutions in the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions in the above embodiments, which will not be elaborated upon here.

[0196] Example 2

[0197] This application embodiment also provides a storage medium storing computer execution instructions. When executed by a processor, these instructions are used to implement the start-up control method for a heat pump water heater as described above. The processor can be electrically connected to a controller so that it can act as the execution entity of the heat pump water heater start-up control method, controlling the control valve assembly 600 through the controller.

[0198] The storage medium can be a computer storage medium, such as a computer-readable storage medium, or a communication medium. A communication medium includes any medium that facilitates the transfer of a computer program from one location to another. A computer storage medium can be any available medium accessible to a general-purpose or special-purpose computer. For example, a computer-readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the computer-readable storage medium. Of course, the computer-readable storage medium can also be a component of the processor. The processor and the computer-readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the ASIC can be located in a user equipment. Of course, the processor and the computer-readable storage medium can also exist as discrete components in a communication device.

[0199] Specifically, the computer-readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random-Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The storage medium can be any available medium accessible to general-purpose or special-purpose computers.

[0200] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0201] The terms "first" and "second" used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0202] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A start-up control method for a heat pump water heater, characterized in that, The heat pump water heater includes a cooling and heating water circuit, a hot water tank, and a control valve assembly. The cooling and heating water circuit includes a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a hot water heat exchanger. The compressor, the outdoor heat exchanger, and the indoor heat exchanger are interconnected in the cooling and heating water circuit. The hot water heat exchanger is used to heat the hot water tank, and the indoor heat exchanger is used to exchange heat with the indoor environment. The control valve assembly includes a first control valve and a second control valve. The first control valve is connected between the outdoor heat exchanger and the indoor heat exchanger, and the second control valve is connected between the hot water heat exchanger and the indoor heat exchanger. The method includes: The actual temperature corresponding to the heat pump water heater is detected, and it is determined whether the heat pump water heater meets the start-up conditions in the coexistence mode based on the actual temperature. The actual temperature includes the actual temperature of the hot water in the hot water tank and the actual cooling temperature of the heat pump water heater. The coexistence mode is a mode in which hot water mode and cooling mode coexist. If the heat pump water heater meets the start-up conditions corresponding to the coexistence mode, then the first control valve and the second control valve are controlled to open to the preset opening degree respectively; The heat pump water heater is started after the cooling and heating water circuit is continuously connected at the preset opening degree for a time greater than or equal to a preset time threshold.

2. The start-up control method according to claim 1, characterized in that, The control of opening the first control valve and the second control valve to a preset opening degree specifically includes: Adjust the opening degree of the first control valve and the second control valve to the maximum opening degree; Alternatively, based on the frequency of the compressor and the outdoor ambient temperature where the outdoor heat exchanger is located, the preset opening degree corresponding to the first control valve and the second control valve is determined respectively, and the opening degree of the first control valve and the second control valve is adjusted to the preset opening degree.

3. The start-up control method according to claim 2, characterized in that, The step of determining the opening degree of the first control valve and the second control valve based on the compressor frequency and the outdoor ambient temperature where the outdoor heat exchanger is located, specifically includes: The preset opening degree of the first control valve is determined based on the compressor frequency, the outdoor ambient temperature, the preset indoor temperature where the indoor heat exchanger is located, and the actual indoor temperature.

4. The start-up control method according to claim 3, characterized in that, The heat pump water heater includes a first calculation module, which is configured to calculate according to a formula. Determine the preset opening degree corresponding to the first control valve. in, This is the preset opening degree corresponding to the first control valve. For the compressor frequency, The outdoor ambient temperature where the outdoor heat exchanger is located. This refers to the actual indoor temperature where the heat pump water heater needs to cool. The preset indoor temperature for which the heat pump water heater needs to cool. , , as well as This is the corresponding adjustment coefficient.

5. The start-up control method according to claim 2, characterized in that, The step of determining the opening degree of the first control valve and the second control valve based on the compressor frequency and the outdoor ambient temperature where the outdoor heat exchanger is located specifically includes: The preset opening degree of the second control valve is determined based on the compressor frequency, the outdoor ambient temperature, the preset hot water temperature of the hot water tank, and the actual hot water temperature.

6. The start-up control method according to claim 5, characterized in that, The heat pump water heater includes a second calculation module, which is configured to calculate according to the formula Determine the preset opening degree corresponding to the second control valve. in, This is the preset opening degree corresponding to the second control valve. For the compressor frequency, The outdoor ambient temperature where the outdoor heat exchanger is located. This refers to the actual temperature of the hot water in the hot water tank. Set the preset temperature for the hot water in the hot water tank. , , as well as This is the corresponding adjustment coefficient.

7. The start-up control method according to claim 1, characterized in that, The step of determining whether the heat pump water heater meets the start-up conditions for coexistence mode based on the actual temperature of the hot water in the hot water tank and the actual cooling temperature of the heat pump water heater specifically includes: Based on the actual temperature of the hot water, determine whether the heat pump water heater meets the start-up conditions of the hot water mode; Based on the actual cooling temperature, determine whether the heat pump water heater meets the start-up conditions of the cooling mode; If the heat pump water heater simultaneously meets the start-up conditions for both the hot water mode and the cooling mode, then it is determined that the heat pump water heater meets the start-up conditions for the coexistence mode.

8. The start-up control method according to claim 7, characterized in that, The step of determining whether the heat pump water heater meets the start-up conditions of the hot water mode based on the actual temperature of the hot water specifically includes: If the actual temperature of the hot water is less than or equal to the difference between the preset temperature of the hot water in the hot water tank and the hysteresis temperature of the hot water in the hot water tank, then the heat pump water heater is determined to meet the start-up conditions of the hot water mode. The step of determining whether the heat pump water heater meets the start-up conditions of the cooling mode based on the actual cooling temperature specifically includes: If the actual cooling temperature is greater than or equal to the sum of the preset room temperature of the indoor heat exchanger and the cooling hysteresis temperature of the indoor heat exchanger, then the heat pump water heater is determined to meet the start-up conditions of the cooling mode.

9. The start-up control method according to any one of claims 1-8, characterized in that, The heat pump water heater includes a throttling valve assembly. The indoor heat exchanger, the outdoor heat exchanger, and the hot water heat exchanger are respectively connected to the compressor and the two ends of the throttling valve assembly to form different heat exchange circuits. The heat exchange circuit includes a refrigeration circuit, a hot water circuit, and a refrigeration-heating water circuit. The refrigeration circuit includes the compressor, the outdoor heat exchanger, and the indoor heat exchanger that are interconnected. The hot water circuit includes the compressor, the outdoor heat exchanger, and the hot water heat exchanger that are interconnected.

10. The start-up control method according to claim 9, characterized in that, The control valve assembly includes a four-way reversing valve, an electric control valve, and a third control valve. The compressor is connected to the indoor heat exchanger, the outdoor heat exchanger, and the hot water heat exchanger respectively through the four-way reversing valve. The electric control valve is connected between the four-way reversing valve and the indoor heat exchanger. The third control valve is connected between the first control valve and the indoor heat exchanger, and between the second control valve and the indoor heat exchanger.

11. The start-up control method according to claim 10, characterized in that, Before controlling the opening degrees of the first control valve and the second control valve, the start-up control method further includes: Control the switching of the four-way directional valve and control the electric control valve and the third control valve to open to preset opening values ​​respectively.

12. The start-up control method according to any one of claims 1-8, characterized in that, If the heat pump water heater does not meet the start-up conditions in the coexistence mode, then the start-up order of the hot water mode and the cooling mode in the heat pump water heater when started individually is determined. If the startup sequence prioritizes the hot water mode, then the first control valve and the second control valve are opened to their respective hot water startup opening degrees.

13. The start-up control method according to claim 12, characterized in that, If the startup sequence prioritizes the hot water mode, then the second control valve is opened to the hot water startup opening degree. The startup control method further includes: Re-determine whether the heat pump water heater meets the start-up conditions in coexistence mode based on the actual temperature; If the heat pump water heater meets the start-up conditions corresponding to the coexistence mode, after the heat pump water heater is stopped to a steady state, the first control valve and the second control valve are controlled to open to the preset opening degree respectively, and after the cooling and heating water circuit is continuously conducted at the preset opening degree for a time greater than or equal to the preset time threshold, the heat pump water heater is restarted.

14. A heat pump water heater, characterized in that, The start-up control method for a heat pump water heater as described in any one of claims 1-13 is adopted.

15. A storage medium, characterized in that, The storage medium stores computer execution instructions, which, when executed by a processor, are used to implement the start-up control method for a heat pump water heater as described in any one of claims 1-13.

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