Heat pump hot water system, control method thereof, electronic device, and storage medium

Abstract

The application discloses a heat pump hot water system, a control method thereof, an electronic device and a storage medium. The heat pump hot water system comprises a water tank and n units, n>=2, each unit is connected with an inlet water pipeline and an outlet water pipeline, the corresponding inlet water temperature of each unit when the unit is at an optimal energy efficiency ratio is different, the n units are sequentially arranged according to the size of the inlet water temperature, so that when all the units are connected in series, the water flowing out of the water tank first enters the first unit and finally enters the nth unit, wherein the inlet water temperature corresponding to the first unit when the first unit is at the optimal energy efficiency ratio is the smallest among the n units, and the inlet water temperature corresponding to the nth unit when the nth unit is at the optimal energy efficiency ratio is the largest among the n units; each unit except the first unit is provided with a valve assembly, and whether the corresponding unit participates in water circulation and the series-parallel connection mode of the unit is changed through the valve assembly. The application can flexibly adjust the connection of each unit according to actual needs, and improve energy efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump hot water system, in particular to a heat pump hot water system, a control method thereof, an electronic device and a storage medium. BACKGROUND

[0002] The heat pump hot water system is a kind of efficient heating system, and its basic principle is the reverse Carnot cycle. The heat pump hot water system includes at least two units for producing hot water, which can be referred to as hot water units, hot water machines, main machines or units. The hot water produced by the hot water machine can be supplied to the user side. Unlike other heat pump systems, the hot water machine transfers heat to water in the condenser, raising the water temperature to the required temperature. Different hot water machines have different capacity and energy efficiency due to the influence of system, structure, refrigerant, operation mode, operation condition, etc.

[0003] Some heat pump hot water systems have a water tank for storing hot water produced by the hot water machine. Since the demand for hot water usually increases first and then decreases over time, the demand for hot water is very small during part of the time period. Storing hot water in the water tank will cause heat loss and waste. Currently, to solve this problem, the water flow between the unit and the water tank can be reduced or some hot water machines can be turned off during the low demand period of hot water, and the water flow between the unit and the water tank can be increased or some hot water machines can be turned on again during the peak demand period of hot water. However, such control cannot fully utilize the performance of the hot water machine, and the system energy efficiency is poor. SUMMARY

[0004] The embodiments of the present application provide a heat pump hot water system, a control method thereof, an electronic device and a storage medium to at least solve the problem of poor energy efficiency of the heat pump hot water system in the prior art.

[0005] To solve the above technical problems, the embodiments of the present application provide a heat pump hot water system, which includes a water tank and n units, n≥2, each unit is connected with an inlet water pipeline and an outlet water pipeline, the inlet water temperature corresponding to each unit at its optimal energy efficiency ratio is different, and the n units are sequentially sorted according to the inlet water temperature, so that the water flowing out of the water tank first enters the first unit and finally enters the nth unit, wherein the inlet water temperature corresponding to the first unit at its optimal energy efficiency ratio is the smallest among the n units, and the inlet water temperature corresponding to the nth unit at its optimal energy efficiency ratio is the largest among the n units.

[0006] Each unit except the first unit is provided with a valve assembly, which controls whether the corresponding unit participates in water circulation and changes the series-parallel connection mode of the units.

[0007] Optionally, the valve assembly comprises a first valve, a second valve and a third valve; in the direction from the first unit to the nth unit, for any unit except the first unit, the water inlet pipeline of the unit is connected to the water outlet pipeline of the previous unit through the first valve, the water inlet pipeline of the unit is connected to the water outlet pipeline of the water tank through the second valve, and the water outlet pipeline of the unit is connected to the water outlet pipeline of the previous unit through the third valve.

[0008] The embodiment of the present application also provides a control method of the heat pump hot water system, which is applied to the heat pump hot water system of the embodiment of the present application, and the method comprises the following steps of:

[0009] detecting an actual temperature of the water tank;

[0010] controlling units to start and stop and controlling the valve assembly to change the series-parallel connection mode of the units according to the actual temperature of the water tank and the set temperature, so that the system energy efficiency ratio is optimal.

[0011] Optionally, the step of controlling the units to start and stop and controlling the valve assembly to change the series-parallel connection mode of the units according to the actual temperature of the water tank and the set temperature, so that the system energy efficiency ratio is optimal, comprises the following steps of:

[0012] if the actual temperature of the water tank is less than the set temperature, controlling the number of units to start according to the absolute value of the difference between the actual temperature of the water tank and the set temperature, determining the units to start according to the unit energy efficiency ratio, and controlling all valve assemblies to make the currently started units in series and the currently stopped units not participate in water circulation;

[0013] if the actual temperature of the water tank is equal to the set temperature, keeping the number of currently started units unchanged, and controlling all valve assemblies to make the currently started units in parallel and the currently stopped units not participate in water circulation;

[0014] if the actual temperature of the water tank is greater than the set temperature, controlling the number of units to start according to the absolute value of the difference between the actual temperature of the water tank and the set temperature, determining the units to stop according to the unit energy efficiency ratio, and controlling all valve assemblies to make the currently started units in parallel and the currently stopped units not participate in water circulation.

[0015] Optionally, the step of determining the units to start according to the unit energy efficiency ratio comprises the following steps of: obtaining the energy efficiency ratio of each unit currently in the stopped state at the current water inlet temperature of the unit, and preferentially starting the unit with a high energy efficiency ratio.

[0016] Optionally, the step of determining the units to stop according to the unit energy efficiency ratio comprises the following steps of: obtaining the energy efficiency ratio of each unit currently in the started state at the current water inlet temperature of the unit, and preferentially stopping the unit with a low energy efficiency ratio.

[0017] Optionally, control all valve assemblies to make the currently opened unit in series and the currently closed unit not participate in water circulation, comprising:

[0018] Control the first valve corresponding to the currently opened unit to be opened, and the second valve and the third valve to be closed.

[0019] Control the first valve and the second valve corresponding to the currently closed unit to be closed, and the third valve to be opened.

[0020] Optionally, control all valve assemblies to make the currently opened unit in parallel and the currently closed unit not participate in water circulation, comprising:

[0021] Control the first valve corresponding to the currently opened unit to be closed, and the second valve and the third valve to be opened.

[0022] Control the first valve and the second valve corresponding to the currently closed unit to be closed, and the third valve to be opened.

[0023] The embodiment of the present application also provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to realize the control method of the heat pump water heating system.

[0024] The embodiment of the present application also provides a non-volatile computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the control method of the heat pump water heating system.

[0025] According to the technical scheme of the present application, each unit is sequentially sorted according to the corresponding inlet water temperature when the optimal energy efficiency ratio is achieved, so that when all units are connected in series, the water flowing out of the water tank first enters the unit that has better performance when the inlet water temperature is low, and finally enters the unit that has better performance when the inlet water temperature is high. And corresponding valve assemblies are set for the units, and whether the corresponding unit participates in water circulation and changes the series-parallel connection mode are controlled through the valve assemblies, so that the connection of each unit can be flexibly adjusted according to actual needs, the performance of each unit is fully utilized, energy saving is realized, the energy efficiency is improved, and the problem of poor energy efficiency of the heat pump water heating system in the prior art is solved, so that the system energy efficiency ratio is optimal. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic diagram of the heat pump water heating system provided by the embodiment of the present application;

[0027] Figure 2 is an enlarged schematic diagram of the valve assembly provided by the embodiment of the present application;

[0028] Figure 3is a flow chart of a control method of a heat pump water heating system provided by an embodiment of the present application;

[0029] Figure 4 is a flow chart of a heat pump water heating system control provided by an embodiment of the present application;

[0030] Figure 5 is a schematic diagram of a hardware structure of an electronic device provided by an embodiment of the present application;

[0031] Explanation of reference signs:

[0032] Water tank 10, valve assembly 20, user end 30, first valve 21, second valve 22, third valve 23, water tank temperature sensing bag 11, water replenishing valve 12, sewage valve 13, first water pump 14, second water pump 31, pressure sensor P, temperature sensor T, check valve K. DETAILED DESCRIPTION

[0033] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0034] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in other than the order illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0035] It should be noted that the steps shown in the flow chart of the drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flow chart, in some cases, the steps shown or described herein can be executed in an order different from that shown herein.

[0036] It should be understood that the term "and / or" used herein is only to describe an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B can represent three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0037] Embodiment 1

[0038] The embodiment provides a heat pump hot water system, Figure 1 is a schematic diagram of the heat pump hot water system provided by the embodiment of the application, as Figure 1 indicated, the heat pump hot water system comprises a water tank 10 and n units, n≥2, each unit is connected with an inlet water pipeline and an outlet water pipeline, hot water produced by the unit is directly sent to the water tank 10 through the outlet water pipeline of the unit or is sent to the water tank 10 after passing through other units, water flowing out of the water tank 10 directly enters the unit through the inlet water pipeline of the unit or enters the unit after passing through other units, and water circulation is formed between the water tank and the unit.

[0039] A first water pump 14 is arranged on a main water circulation pipeline between the water tank 10 and the unit, for controlling the water flow between the water tank 10 and the unit, and the power of the first water pump 14 can be adjusted according to the actual temperature of the water tank and the set temperature, for example, if the actual temperature of the water tank is less than the set temperature, the power of the first water pump 14 is increased, if the actual temperature of the water tank is greater than the set temperature, the power of the first water pump 14 is decreased, and the power adjustment range can be a fixed value or can be determined by the deviation between the actual temperature of the water tank and the set temperature, and the greater the deviation, the greater the power adjustment range. P represents a pressure sensor, T represents a temperature sensor, and K represents a check valve, Figure 1 The same style devices in the water tank 10 are not repeated, for example, the inlet and outlet water pipelines of the unit are also provided with pressure sensors and temperature sensors. The water tank 10 is provided with a water tank temperature sensing bag 11 for detecting the actual temperature of the water tank. The water tank 10 is connected with a water supplement pipeline, and a water supplement valve 12 and a check valve are arranged on the water supplement pipeline. The water tank 10 is also connected with a sewage pipeline, and a sewage valve 13 is arranged on the sewage pipeline. The water tank 10 also constitutes water circulation with a user terminal 30, and a second water pump 31 is arranged on a water circulation loop between the water tank 10 and the user terminal 30, for controlling the water flow between the water tank 10 and the user terminal 30, and the power of the second water pump 31 can be adjusted according to the user water demand, for example, if the user water demand is large, the power of the second water pump 31 is increased, and if the user water demand is small, the power of the second water pump 31 is decreased.

[0040] The water inlet temperature corresponding to the optimal energy efficiency ratio of each unit is different, and the n units are sequentially arranged according to the water inlet temperature, so that the water flowing out of the water tank 10 first enters the first unit (i.e., unit 1) and finally enters the n th unit (i.e., unit n) when all the units are connected in series, wherein the water inlet temperature corresponding to the optimal energy efficiency ratio of the first unit is the smallest among the n units, and the water inlet temperature corresponding to the optimal energy efficiency ratio of the n th unit is the largest among the n units. The water inlet temperature here refers to the water inlet temperature of the unit.

[0041] When designing the whole water heater unit, the energy efficiency ratio of each unit at different water inlet temperatures can be tested. For each unit, find the water inlet temperature corresponding to the optimal energy efficiency ratio as the basis for arranging the installation of the unit.

[0042] For example, before the unit is installed, the units are sequentially arranged according to the water inlet temperature corresponding to the optimal energy efficiency ratio from small to large as 1, 2, …, n, so that when all the units are connected in series, the water flowing out of the water tank first enters the unit that has better performance at low water inlet temperature, and finally enters the unit that has better performance at high water inlet temperature.

[0043] Each unit except the first unit is provided with a valve assembly 20, which controls whether the corresponding unit participates in the water circulation and changes the series-parallel connection mode of the unit.

[0044] When the units are connected in series, the water flowing out of the water tank is preferentially heated in the unit that has better performance at low water inlet temperature, and then continues to be heated in the next unit, and finally flows out of the unit that has better performance at high water inlet temperature to the water tank. Through series connection of the units, one-time heating of hot water can be realized, and the performance of each unit can be better played, so that the system energy efficiency ratio is optimal.

[0045] When the units are connected in parallel, each unit connected in parallel is independently connected with the water tank to form a water circulation. According to specific needs, low-energy-efficiency units can be closed or high-energy-efficiency units can be opened. Through parallel connection of the units, circulating heating of hot water can be realized, which has good running performance and stability, and tries to ensure that the system energy efficiency ratio is optimal.

[0046] The embodiment sorts the units according to the corresponding inlet water temperatures when the units are in the optimal energy efficiency ratios, so that when all the units are connected in series, the water flowing out of the water tank first enters the unit that has better performance when the inlet water temperature is low, and finally enters the unit that has better performance when the inlet water temperature is high. Corresponding valve assemblies are arranged for the units, and whether the corresponding unit participates in water circulation and the series-parallel connection mode of the unit are controlled through the valve assemblies, so that the connection of each unit can be flexibly adjusted according to actual needs, the performance of each unit is fully utilized, energy saving is realized, the energy efficiency is improved, and the problem of poor energy efficiency of the heat pump water heating system in the prior art is solved, so that the system energy efficiency ratio is optimal.

[0047] As shown in Figure 2 , the valve assembly 20 includes a first valve 21, a second valve 22 and a third valve 23. As shown in Figure 1 and Figure 2 , in the direction from the first unit to the nth unit, for any unit except the first unit, the inlet water pipeline of the unit is connected to the outlet water pipeline of the previous unit through the first valve 21, the inlet water pipeline of the unit is connected to the outlet water pipeline of the water tank 10 through the second valve 22, and the outlet water pipeline of the unit is connected to the outlet water pipeline of the previous unit through the third valve 23. Through such a setting, the change of the series-parallel connection mode of the unit and the control of whether the unit participates in water circulation can be simply and reliably realized.

[0048] In the embodiment, if the first valve 21 corresponding to any unit is opened and the second valve 22 and the third valve 23 thereof are closed, the outlet water of the previous unit can flow through the unit, so that the units are connected in series. If the second valve 22 and the third valve 23 of any unit are opened and the first valve 21 thereof is closed, the water flowing out of the water tank can enter the unit and the water flowing out of the unit can return to the water tank, so that the units are connected in parallel. If the unit does not participate in water circulation, the first valve 21 and the second valve 22 corresponding to the unit are closed to prevent water from flowing into the unit, and the third valve 23 corresponding to the unit is opened to ensure that other units can smoothly participate in water circulation.

[0049] The first valve 21, the second valve 22 and the third valve 23 in the embodiment can be stop valves, electromagnetic valves or other valve pieces having on-off control functions.

[0050] Embodiment 2

[0051] The embodiment provides a control method of a heat pump water heating system, which can be applied to the heat pump water heating system described in the above embodiments. Figure 3 The embodiment provides a control method of a heat pump water heating system, which can be applied to the heat pump water heating system described in the above embodiments. Figure 3 The method includes the following steps:

[0052] S301, detecting the actual temperature of the water tank.

[0053] S302, according to the water tank actual temperature and the set temperature, control the unit start-stop and control the valve assembly to change the unit series-parallel connection mode, so that the system can be optimal energy efficiency. By controlling the valve assembly can also make the unit (ie, off the unit) out of the water cycle loop.

[0054] The embodiment according to the water tank actual temperature and the set temperature, control the unit start-stop and control the valve assembly to change the unit series-parallel connection mode, so that the system can be optimal energy efficiency, according to the actual demand to adjust the connection of each unit, make full use of the performance of each unit, energy saving, improve energy efficiency, solve the problem of poor energy efficiency of the existing technology of heat pump hot water system, so that the system can be optimal energy efficiency.

[0055] In an alternative embodiment, according to the water tank actual temperature and the set temperature, control the unit start-stop and control the valve assembly to change the unit series-parallel connection mode, so that the system can be optimal energy efficiency, comprising:

[0056] If the water tank actual temperature is less than the set temperature, according to the absolute value of the difference between the water tank actual temperature and the set temperature, control the number of units to be opened, according to the unit energy efficiency ratio to determine the unit to be opened, control all valve assemblies to make the currently opened unit in series and the currently closed unit not participate in the water cycle;

[0057] If the water tank actual temperature is equal to the set temperature, keep the current number of units opened unchanged, control all valve assemblies to make the currently opened unit in parallel and the currently closed unit not participate in the water cycle;

[0058] If the water tank actual temperature is greater than the set temperature, according to the absolute value of the difference between the water tank actual temperature and the set temperature, control the number of units to be opened, according to the unit energy efficiency ratio to determine the unit to be closed, control all valve assemblies to make the currently opened unit in parallel and the currently closed unit not participate in the water cycle.

[0059] The embodiment is specific to different situations, which can meet the user's demand while ensuring the system energy efficiency ratio as optimal as possible, energy saving and improving energy efficiency.

[0060] The unit heating energy efficiency ratio can be obtained by calculating the ratio of heating capacity to heating power consumption.

[0061] The specific control of each case is described below.

[0062] (1) The water tank actual temperature is less than the set temperature

[0063] In the case that the actual temperature of the water tank is less than the set temperature, it indicates that the temperature of the water tank needs to be increased, and the number of units needs to be increased. Different temperature difference intervals corresponding to the number of units to be increased can be set in advance. The absolute value of the difference between the actual temperature of the water tank and the set temperature is in different temperature difference intervals, and the number of units to be increased is different. The larger the temperature difference interval where the absolute value of the difference between the actual temperature of the water tank and the set temperature is located, the more units need to be increased. Thus, the number of units to be started is controlled according to the absolute value of the difference between the actual temperature of the water tank and the set temperature, so as to timely meet the user's demand.

[0064] After determining the number of units to be increased, the units to be started can be determined according to the energy efficiency ratio of the units, so as to improve the energy efficiency of the system. Specifically, the energy efficiency ratio of each unit currently in the closed state at the current inlet water temperature is obtained, and the unit with a high energy efficiency ratio is started first. The energy efficiency ratio of each unit at different inlet water temperatures can be tested and stored in advance, so that the energy efficiency ratio of each unit currently in the closed state at the current inlet water temperature can be directly read as a judgment basis. Of course, real-time calculation can also be performed.

[0065] All valve assemblies are controlled to make the currently started units in series and the currently closed units not participate in water circulation, including: controlling the first valve corresponding to the currently started units to be opened, and the second valve and the third valve to be closed; controlling the first valve and the second valve corresponding to the currently closed units to be closed, and the third valve to be opened. Through the specific control, the units to be started can be quickly separated from the water flow path, the flow loss can be avoided, and the units to be started can be quickly connected in series, so as to meet the user's demand while ensuring the optimal energy efficiency of the system.

[0066] The actual temperature of the water tank is less than the set temperature, which indicates that the temperature of the water tank needs to be increased. At this time, the unit with a high energy efficiency ratio under the current working condition can be started first. For each unit currently started, the first valve is opened, and the second valve and the third valve are closed, so that the currently started units are connected in series. The water flowing out of the water tank is preferentially heated in the unit that has better performance when the inlet water temperature is low. The outlet water of the unit is heated in the next unit, and after step-by-step heating, the water finally flows out of the unit that has better performance when the inlet water temperature is high. Through the series operation of the units, the performance of each unit is better played, so that the system performance is more optimal.

[0067] This embodiment takes a unit with a fixed frequency compressor as an example for illustration. If the unit adopts a variable frequency compressor, the compressor frequency of the unit that has been started can be increased first. When the compressor frequency of all the units that have been started is increased to a certain frequency, the number of units to be increased is considered.

[0068] (2) The actual temperature of the water tank is equal to the set temperature

[0069] In the case that the actual temperature of the water tank is equal to the set temperature, it indicates that the water tank temperature needs to be maintained, and in this case, the number of units to be turned on does not need to be changed, and the current number of units to be turned on can be maintained.

[0070] controlling all valve assemblies so that the currently turned-on units are connected in parallel and the currently turned-off units do not participate in water circulation, including: controlling the first valve corresponding to the currently turned-on units to be closed, and the second valve and the third valve to be opened; controlling the first valve and the second valve corresponding to the currently turned-off units to be closed, and the third valve to be opened. Through this specific control, the units to be turned off can be quickly disconnected from the water flow path, avoiding flow loss, and the units to be turned on can be quickly connected in parallel, meeting user demand while ensuring optimal system energy efficiency.

[0071] In the case that the actual temperature of the water tank is close to the set temperature, it indicates that the water tank temperature needs to be maintained, and in this case, for the currently turned-on units, the first valve is closed, and the second valve and the third valve are opened, so that the currently turned-on units are connected in parallel and run, realizing the circulation heating of hot water and having good running performance and stability.

[0072] (3) The actual temperature of the water tank is greater than the set temperature

[0073] In the case that the actual temperature of the water tank is greater than the set temperature, it indicates that the water tank temperature needs to be lowered, and part of the units need to be turned off. Different temperature difference intervals corresponding to the number of units to be turned off can be pre-set. The absolute value of the difference between the actual temperature of the water tank and the set temperature is in different temperature difference intervals, and the number of units to be turned off is different. The greater the temperature difference interval in which the absolute value of the difference between the actual temperature of the water tank and the set temperature is located, the more units need to be turned off. Thus, the number of units to be turned on is controlled according to the absolute value of the difference between the actual temperature of the water tank and the set temperature, thereby timely meeting user demand.

[0074] After determining the number of units to be turned off, the units to be turned off can be determined according to the energy efficiency ratio of the units, thereby improving the energy efficiency of the system. Specifically, the energy efficiency ratio of each unit currently in the on state at its current inlet water temperature is obtained, and the unit with a low energy efficiency ratio is preferentially turned off. The energy efficiency ratio of each unit at different inlet water temperatures can be pre-tested and stored, so that the energy efficiency ratio of each unit currently in the on state at its current inlet water temperature can be directly read as a judgment basis. Of course, real-time calculation can also be performed.

[0075] Controlling all valve assemblies to ensure that currently active units operate in parallel while currently shut-down units do not participate in water circulation includes: closing the first valve and opening the second and third valves corresponding to currently active units; and closing the first and second valves and opening the third valve corresponding to currently shut-down units. This specific control allows for a simple and quick disconnection of shut-down units from the water flow path, avoiding flow loss, and enables simple and quick parallel operation of active units, ensuring optimal system energy efficiency while meeting user needs.

[0076] If the actual temperature of the water tank is higher than the set temperature, it means that the water tank temperature needs to be lowered. At this time, the units with the lowest energy efficiency ratio under the current operating conditions can be shut down first. For each unit that is currently running, close its first valve and open its second and third valves to enable the currently running units to operate in parallel, thereby achieving hot water circulation heating and having good operating performance and stability.

[0077] The control of the above-described heat pump water heating system will be described below with reference to a specific embodiment. However, it is worth noting that this specific embodiment is only for better illustration of this application and does not constitute an undue limitation of this application. The same or corresponding terminology as in the above embodiment will not be repeated in this embodiment.

[0078] like Figure 4 As shown, the control process of a heat pump water heating system includes the following steps:

[0079] S401, the heat pump water heating system is started and the unit is providing heating.

[0080] S402 detects the actual temperature of the water tank and determines the optimal connection method for each unit.

[0081] S403, the water tank needs to be heated. The units that are currently in operation are connected in series, specifically: the first valve is opened, and the second and third valves are closed, so that the units that are currently in operation are connected in series.

[0082] S404, the water tank needs to be insulated, and the units that are currently in operation are connected in parallel. Specifically, the first valve is closed, and the second and third valves are open, so that the units that are currently in operation can be connected in parallel.

[0083] S405, the water tank needs to be cooled. The units that are turned on are connected in parallel, specifically: the first valve is closed, and the second and third valves are open.

[0084] S406, after running continuously for time t, return to S402 to re-detect parameter values.

[0085] For units that are in the off state, they need to be disconnected from the water flow path, specifically by closing the first and second valves and opening the third valve.

[0086] Example 3

[0087] The embodiment provides a non-volatile computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the control method of the heat pump hot water system.

[0088] Embodiment 4

[0089] The embodiment provides an electronic device, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the control method of the heat pump hot water system when executing the computer program.

[0090] Figure 5 The embodiment provides a hardware structure schematic diagram of the electronic device, as shown in the figure, the electronic device comprises: Figure 5

[0091] one or more processors 510 and a memory 520, Figure 5 In the embodiment, the processor 510 is taken as an example.

[0092] The electronic device can further comprise an input device 530 and an output device 540.

[0093] The processor 510, the memory 520, the input device 530 and the output device 540 can be connected through a bus or other means, Figure 5 In the embodiment, the connection through the bus is taken as an example.

[0094] The memory 520 is a non-volatile computer readable storage medium, which can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules of the control method of the heat pump hot water system in the embodiment. The processor 510 executes various function applications and data processing by running the non-volatile software programs, instructions and modules stored in the memory 520, that is, implements the control method of the heat pump hot water system.

[0095] The memory 520 can comprise a program storage area and a data storage area, wherein the program storage area can store application programs required by the operation device and at least one function; the data storage area can store performance data of each unit under different working conditions obtained by pre-test, etc. In addition, the memory 520 can comprise a high-speed random access memory, and can further comprise a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage device.

[0096] The input device 530 can receive input digital or character information, and generate key signal input related to user settings and function control of the electronic device. The output device 540 can comprise a display device such as a display screen. ​

[0097] The one or more modules are stored in the memory 520 and, when executed by the one or more processors 510, perform the control method of the heat pump water heating system described above.

[0098] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place or distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0099] From the above description of the embodiments, those skilled in the art can clearly understand that the embodiments can be implemented by means of software plus necessary universal hardware platforms, and of course can also be implemented by hardware. Based on such understanding, the above technical solutions, essentially or in terms of contribution to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0100] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A heat pump water heating system comprising a water tank and n units, n≥2, each unit being connected with an inlet water pipeline and an outlet water pipeline, characterized in that: the water temperature corresponding to the optimal energy efficiency ratio of each unit is different, and the n units are sequentially arranged according to the water temperature in descending order, so that when all the units are connected in series, the water flowing out of the water tank first enters the first unit and finally enters the nth unit, wherein the water temperature corresponding to the optimal energy efficiency ratio of the first unit is the smallest among the n units, and the water temperature corresponding to the optimal energy efficiency ratio of the nth unit is the largest among the n units; each unit except the first unit is provided with a valve assembly, which is used to control whether the corresponding unit participates in the water circulation and change the series-parallel connection mode of the units. The valve assembly comprises a first valve, a second valve and a third valve. In the direction from the first unit to the nth unit, for any unit except the first unit, the inlet water pipeline of the unit is connected to the outlet water pipeline of the previous unit through the first valve, the inlet water pipeline of the unit is connected to the outlet water pipeline of the water tank through the second valve, and the outlet water pipeline of the unit is connected to the outlet water pipeline of the previous unit through the third valve.

2. The heat pump hot water system according to claim 1, characterized by, The method applied to the heat pump water heating system of claim 1 or 2 comprises: detecting the actual temperature of the water tank; 3. A control method of a heat pump hot-water system, characterized by, controlling the start and stop of the units and the valve assemblies to change the series-parallel connection mode of the units according to the actual temperature of the water tank and the set temperature, so as to optimize the energy efficiency ratio of the system. controlling the start and stop of the units and the valve assemblies to change the series-parallel connection mode of the units according to the actual temperature of the water tank and the set temperature, so as to optimize the energy efficiency ratio of the system, comprising: if the actual temperature of the water tank is less than the set temperature, controlling the number of units to be started according to the absolute value of the difference between the actual temperature of the water tank and the set temperature, determining the units to be started according to the energy efficiency ratio of the units, and controlling all the valve assemblies to connect the currently started units in series and not to participate in the water circulation of the currently stopped units; 4. The method of claim 3, wherein, if the actual temperature of the water tank is equal to the set temperature, keeping the number of currently started units unchanged, and controlling all the valve assemblies to connect the currently started units in parallel and not to participate in the water circulation of the currently stopped units; if the actual temperature of the water tank is greater than the set temperature, controlling the number of units to be stopped according to the absolute value of the difference between the actual temperature of the water tank and the set temperature, determining the units to be stopped according to the energy efficiency ratio of the units, and controlling all the valve assemblies to connect the currently started units in parallel and not to participate in the water circulation of the currently stopped units. determining the units to be started according to the energy efficiency ratio of the units, comprising: obtaining the energy efficiency ratio of each unit currently in the stopped state at the current inlet water temperature of the unit, and starting the unit with a high energy efficiency ratio first. determining the units to be stopped according to the energy efficiency ratio of the units, comprising: obtaining the energy efficiency ratio of each unit currently in the started state at the current inlet water temperature of the unit, and stopping the unit with a low energy efficiency ratio first.

5. The method of claim 4, wherein, controlling all the valve assemblies to connect the currently started units in series and not to participate in the water circulation of the currently stopped units, comprising:

6. The method of claim 4, wherein, ​ 7. The method of claim 4, wherein, ​ controlling the first valve corresponding to the currently opened unit to be opened, and the second valve and the third valve to be closed; controlling the first valve and the second valve corresponding to the currently closed unit to be closed, and the third valve to be opened.

8. The method of claim 4, wherein, controlling all valve assemblies to make the currently opened unit in parallel and the currently closed unit not participate in water circulation, comprising: controlling the first valve corresponding to the currently opened unit to be closed, and the second valve and the third valve to be opened; controlling the first valve and the second valve corresponding to the currently closed unit to be closed, and the third valve to be opened.

9. An electronic device comprising: A memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the control method of the heat pump hot water system according to any one of claims 3 to 8 when executing the computer program.

10. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the control method of the heat pump hot water system according to any one of claims 3 to 8.

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