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

Abstract

The invention discloses a heat pump hot water system and a control method thereof, electronic equipment and a storage medium. The heat pump hot water system comprises a water tank and n units, n is larger than or equal to 2, each unit is connected with a water inlet pipeline and a water outlet pipeline, water inlet temperatures corresponding to the units in the optimal energy efficiency ratios are different, and the n units are sequentially ranked according to the water inlet temperatures. When all the units are connected in series, water flowing out of the water tank firstly enters the first unit and finally enters the nth unit, the corresponding water inlet temperature when the first unit is located at the optimal energy efficiency ratio of the first unit is the minimum in the n units, and the corresponding water inlet temperature when the nth unit is located at the optimal energy efficiency ratio of the nth unit is the maximum in the n units; each unit except the first unit is correspondingly provided with a valve assembly, and whether the corresponding unit participates in water circulation or not is controlled through the valve assemblies, and the series-parallel connection mode of the units is changed. The connecting condition of all the units can be flexibly adjusted according to actual requirements, and the energy efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump water heating systems, and in particular to a heat pump water heating system and a control method thereof, an electronic device and a storage medium. Background Art

[0002] The heat pump hot water system is a highly 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 called hot water units, hot water machines, main units or units. The hot water produced by the hot water machine can be supplied to the user side. Different from other heat pump systems, the hot water machine transfers heat to water in the condenser to raise the water temperature to the required temperature. Different hot water machines are affected by the system, structure, refrigerant, operation mode, operating conditions, etc., and have different capabilities and energy efficiencies.

[0003] Some heat pump hot water systems are equipped with water tanks to store the hot water produced by the water heater. Since the demand for hot water usually increases first and then decreases over time, and the demand for hot water is very low during certain periods of time, storing hot water in the water tank will cause heat loss and waste. At present, this problem can be solved by reducing the water flow circulating between the unit and the water tank or shutting down some water heaters during the low-demand period, and increasing the water flow circulating between the unit and the water tank or opening more water heaters during the peak demand period. However, with such control, the performance of the water heater is difficult to fully utilize, and the system energy efficiency is poor. Summary of the invention

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

[0005] To solve the above technical problems, an embodiment of the present invention provides a heat pump hot water system, comprising a water tank and n units, n≥2, each unit is connected to a water inlet pipeline and a water outlet pipeline, each unit has a different corresponding water inlet temperature when it is at its own optimal energy efficiency ratio, and the n units are sorted in sequence according to the size of the water inlet temperature, so that when all 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 inlet temperature corresponding to the first unit when it is at its own optimal energy efficiency ratio is the smallest among the n units, and the water inlet temperature corresponding to the nth unit when it is at its own optimal energy efficiency ratio is the largest among the n units;

[0006] Each unit except the first unit is provided with a corresponding valve assembly, and the valve assembly is used to control whether the corresponding unit participates in the water circulation and change the series and parallel connection mode of the units.

[0007] Optionally, the valve assembly includes: 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 pipe of the unit is connected to the water outlet pipe of the previous unit through the first valve, the water inlet pipe of the unit is connected to the water outlet pipe of the water tank through the second valve, and the water outlet pipe of the unit is connected to the water outlet pipe of the previous unit through the third valve.

[0008] The embodiment of the present invention further provides a control method for a heat pump hot water system, which is applied to the heat pump hot water system described in the embodiment of the present invention, and the method includes:

[0009] Detect the actual temperature of the water tank;

[0010] According to the actual temperature of the water tank and the set temperature, the start and stop of the unit is controlled and the valve assembly is controlled to change the series and parallel connection mode of the unit to optimize the energy efficiency ratio of the system.

[0011] Optionally, according to the actual temperature of the water tank and the set temperature, the start and stop of the unit is controlled and the valve assembly is controlled to change the series and parallel connection mode of the unit to optimize the energy efficiency ratio of the system, including:

[0012] If the actual temperature of the water tank is lower than the set temperature, 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, the units to be turned on are determined according to the energy efficiency ratio of the units, and all valve components are controlled so that the currently turned on units are connected in series and the currently turned off units do not participate in the water circulation;

[0013] If the actual temperature of the water tank is equal to the set temperature, the number of units currently turned on is kept unchanged, and all valve components are controlled so that the units currently turned on are connected in parallel and the units currently turned off do not participate in the water circulation;

[0014] If the actual temperature of the water tank is greater than the set temperature, the number of units opened is controlled according to the absolute value of the difference between the actual temperature of the water tank and the set temperature, the units that need to be closed are determined according to the energy efficiency ratio of the units, and all valve components are controlled so that the currently opened units are connected in parallel and the currently closed units do not participate in the water circulation.

[0015] Optionally, determining the unit to be turned on according to the unit energy efficiency ratio includes: obtaining the energy efficiency ratio of each unit currently in a closed state at its current inlet water temperature, and giving priority to turning on the unit with a high energy efficiency ratio.

[0016] Optionally, determining the unit to be shut down according to the unit energy efficiency ratio includes: obtaining the energy efficiency ratio of each unit currently in the on state at its current inlet water temperature, and giving priority to shutting down the unit with a low energy efficiency ratio.

[0017] Optionally, all valve components are controlled so that the units currently turned on are connected in series and the units currently turned off do not participate in the water circulation, including:

[0018] Control the first valve corresponding to the currently turned-on unit to open, and the second valve and the third valve to close;

[0019] The first valve and the second valve corresponding to the currently closed unit are controlled to be closed, and the third valve is controlled to be opened.

[0020] Optionally, all valve components are controlled so that the currently turned-on units are connected in parallel and the currently turned-off units do not participate in the water circulation, including:

[0021] Control the first valve corresponding to the currently turned-on unit to close, and the second valve and the third valve to open;

[0022] The first valve and the second valve corresponding to the currently closed unit are controlled to be closed, and the third valve is controlled to be opened.

[0023] An embodiment of the present invention further provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the control method of the heat pump hot water system described in the embodiment of the present invention when executing the computer program.

[0024] The embodiment of the present invention further provides a non-volatile computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the control method of the heat pump hot water system described in the embodiment of the present invention is implemented.

[0025] By applying the technical solution of the present invention, each unit is sorted in sequence according to the corresponding water inlet temperature when it is at its optimal energy efficiency ratio, 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 water inlet temperature is low, and finally enters the unit that has better performance when the water inlet temperature is high. In addition, corresponding valve components are set for the units, and the valve components are used to control whether the corresponding unit participates in the water circulation and change the series and parallel mode of the units. Therefore, the connection status of each unit can be flexibly adjusted according to actual needs, and the performance of each unit can be fully utilized to achieve energy saving and improve energy efficiency. The problem of poor energy efficiency of heat pump hot water systems in the prior art is solved, and the system energy efficiency ratio is optimized. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0031] Description of reference numerals:

[0032] Water tank 10, valve assembly 20, user terminal 30, first valve 21, second valve 22, third valve 23, water tank temperature sensing package 11, water supply valve 12, drain 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 purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

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

[0036] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0037] Example 1

[0038] This embodiment provides a heat pump hot water system. Figure 1 Schematic diagram of a heat pump hot water system provided by an embodiment of the present invention. Figure 1 As shown, the heat pump hot water system includes: a water tank 10 and n units, n≥2, each unit is connected to a water inlet pipeline and a water outlet pipeline, the hot water produced by the unit is directly sent to the water tank 10 through the water outlet pipeline of the unit or is sent to the water tank 10 after passing through other units, and the water flowing out of the water tank 10 directly enters the unit through the water inlet pipeline of the unit or enters the unit after passing through other units, forming a water cycle between the water tank and the unit.

[0039] A first water pump 14 is provided on the main water circulation path between the water tank 10 and the unit to control the water flow between the water tank 10 and the unit. Specifically, 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 lower than the set temperature, the power of the first water pump 14 is increased. If the actual temperature of the water tank is higher than the set temperature, the power of the first water pump 14 is reduced. The power adjustment range can be a fixed value or determined by the deviation between the actual temperature of the water tank and the set temperature. 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 Components of the same style are not marked with repeated symbols. For example, pressure sensors and temperature sensors are also provided on the water inlet and outlet pipes of the unit. A water tank temperature sensing package 11 is provided in the water tank 10 for detecting the actual temperature of the water tank. The water tank 10 is connected to a water supply pipeline, on which a water supply valve 12 and a check valve are provided. The water tank 10 is also connected to a sewage pipeline, on which a sewage valve 13 is provided. The water tank 10 also forms a water cycle with the user terminal 30. A second water pump 31 is provided on the 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. Specifically, the power of the second water pump 31 can be adjusted according to the user's water demand. For example, if the user's water demand is large, the power of the second water pump 31 is increased, and if the user's water demand is small, the power of the second water pump 31 is reduced.

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

[0041] When designing the whole unit of the hot water unit, the energy efficiency ratio of each unit at different inlet water temperatures can be tested. For each unit, the corresponding inlet water temperature when it is at the optimal energy efficiency ratio is found as the basis for the unit sequence installation.

[0042] For example, before the units are installed, the units are sorted from small to large as 1, 2...n according to the inlet water temperature corresponding to their respective optimal energy efficiency ratios, 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.

[0043] Each unit except the first unit is provided with a corresponding valve assembly 20, through which the corresponding unit is controlled to participate in the water circulation and the series-parallel connection mode of the units is changed.

[0044] When the units are connected in series, the water flowing out of the water tank will first enter the unit that has better performance when the inlet water temperature is low for heating. After flowing out of this unit, the water will enter the next unit for further heating. After being heated step by step, it will eventually flow out to the water tank from the unit that has better performance when the inlet water temperature is high. By operating the units in series, the hot water can be heated once, and the performance of each unit can be better exerted, thereby optimizing the system energy efficiency ratio.

[0045] When the units are connected in parallel, each unit in parallel forms a water circulation with the water tank separately. The low-efficiency units can be shut down or the high-efficiency units can be turned on according to specific needs. By operating the units in parallel, the circulation heating of hot water can be achieved, with good operating performance and stability, and the system energy efficiency ratio can be optimized as much as possible.

[0046] In this embodiment, each unit is sorted in sequence according to the corresponding water inlet temperature when it is at its optimal energy efficiency ratio, 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 water inlet temperature is low, and finally enters the unit that has better performance when the water inlet temperature is high. In addition, a corresponding valve component is set for the unit, and the valve component is used to control whether the corresponding unit participates in the water circulation and change the series and parallel mode of the unit. Therefore, the connection status of each unit can be flexibly adjusted according to actual needs, and the performance of each unit can be fully utilized to achieve energy saving and improve energy efficiency. This solves the problem of poor energy efficiency of heat pump hot water systems in the prior art and optimizes the system energy efficiency ratio.

[0047] like Figure 2 As shown, the valve assembly 20 includes: a first valve 21, a second valve 22 and a third valve 23. Figure 1 and Figure 2 As shown, 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 21, the water inlet pipeline of the unit is connected to the water outlet pipeline of the water tank 10 through the second valve 22, and the water outlet pipeline of the unit is connected to the water outlet pipeline of the previous unit through the third valve 23. Through such an arrangement, it is possible to simply and reliably realize the change of the series and parallel connection mode of the units and control whether the units participate in the water circulation.

[0048] In this embodiment, if the first valve 21 corresponding to any unit is opened and the second valve 22 and the third valve 23 are closed, the water output of the previous unit can flow through the unit, thereby realizing the series connection of the units; if the second valve 22 and the third valve 23 of any unit are opened and the first valve 21 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, thereby realizing the parallel connection of the units. If the unit does not participate in the water circulation, the first valve 21 and the second valve 22 corresponding to the unit are closed so that water cannot flow into the unit, and the third valve 23 corresponding to the unit is opened to ensure that other units can smoothly participate in the water circulation.

[0049] In the present embodiment, the first valve 21 , the second valve 22 and the third valve 23 may be valves with an on-off control function, such as stop valves and solenoid valves.

[0050] Example 2

[0051] This embodiment provides a control method for a heat pump hot water system, which can be applied to the heat pump hot water system described in the above embodiment. Figure 3 is a flow chart of a control method for a heat pump hot water system provided by an embodiment of the present invention. Figure 3 As shown, the method comprises the following steps:

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

[0053] S302, according to the actual temperature of the water tank and the set temperature, control the start and stop of the unit and control the valve assembly to change the series and parallel connection mode of the unit to optimize the system energy efficiency ratio. By controlling the valve assembly, the unit that does not participate in the water circulation (i.e., the shut-down unit) can also be disconnected from the water circulation loop.

[0054] This embodiment controls the start and stop of the unit and controls the valve assembly to change the series and parallel connection mode of the unit according to the actual temperature of the water tank and the set temperature, so that the connection status of each unit can be flexibly adjusted according to actual needs, and the performance of each unit can be fully utilized to achieve energy saving and improve energy efficiency. It solves the problem of poor energy efficiency of heat pump hot water systems in the prior art and optimizes the system energy efficiency ratio.

[0055] In an optional embodiment, according to the actual temperature of the water tank and the set temperature, the start and stop of the unit is controlled and the valve assembly is controlled to change the series and parallel connection mode of the unit to optimize the system energy efficiency ratio, including:

[0056] If the actual temperature of the water tank is lower than the set temperature, 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, the units to be turned on are determined according to the energy efficiency ratio of the units, and all valve components are controlled so that the currently turned on units are connected in series and the currently turned off units do not participate in the water circulation;

[0057] If the actual temperature of the water tank is equal to the set temperature, the number of units currently turned on is kept unchanged, and all valve components are controlled so that the units currently turned on are connected in parallel and the units currently turned off do not participate in the water circulation;

[0058] If the actual temperature of the water tank is greater than the set temperature, the number of units opened is controlled according to the absolute value of the difference between the actual temperature of the water tank and the set temperature, the units that need to be closed are determined according to the energy efficiency ratio of the units, and all valve components are controlled so that the currently opened units are connected in parallel and the currently closed units do not participate in the water circulation.

[0059] This implementation method performs corresponding specific controls according to different situations, and can ensure the optimal system energy efficiency ratio as much as possible while meeting user needs, thereby achieving energy saving and improving energy efficiency.

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

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

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

[0063] When the actual temperature of the water tank is lower than the set temperature, it means that the water tank temperature needs to be increased and additional units need to be turned on. The number of additional units corresponding to different temperature difference intervals can be preset. 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 additional units 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, the more units need to be turned on. Therefore, the number of units turned on 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 meet user needs in a timely manner.

[0064] After determining the number of units that need to be added, the units that need to be turned on can be determined based on the unit energy efficiency ratio, thereby improving the system energy efficiency. Specifically, the energy efficiency ratio of each unit that is currently in a closed state at its current inlet water temperature is obtained, and the units with high energy efficiency ratios are turned on first. Specifically, the energy efficiency ratios of each unit at different inlet water temperatures can be tested and stored in advance, so that the energy efficiency ratios of each unit that is currently in a closed state at its current inlet water temperature can be directly read as a basis for judgment, and of course, it can also be calculated in real time.

[0065] Control all valve components so that the currently turned-on units are connected in series and the currently turned-off units do not participate in the water circulation, including: controlling the first valve corresponding to the currently turned-on units to be turned on, and the second and third valves to be turned off; controlling the first and second valves corresponding to the currently turned-off units to be turned off, and the third valve to be turned on. Through this specific control, the turned-off units can be simply and quickly separated from the water flow path to avoid flow loss, and the turned-on units can be simply and quickly connected in series, ensuring the optimal system energy efficiency while meeting user needs.

[0066] The actual temperature of the water tank is lower than the set temperature, indicating that the water tank temperature needs to be increased. At this time, the unit with the highest energy efficiency ratio under the current working conditions can be turned on first. For each unit currently turned on, open its first valve, close its second valve and third valve, so that the currently turned on units can be operated in series. The water flowing out of the water tank will first enter the unit that has better performance when the inlet water temperature is low for heating. The water out of this unit will enter the next unit for further heating. After being heated step by step, it will eventually flow out of the unit that has better performance when the inlet water temperature is high. By operating the units in series, hot water can be heated once, and the performance of each unit can be better exerted, thereby making the system performance better.

[0067] This embodiment is described by taking the fixed frequency compressor as an example. If the unit adopts a variable frequency compressor, the compressor frequency of the turned-on unit can be increased first, and when the compressor frequency of all turned-on units is increased to a certain frequency, consider adding more units.

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

[0069] When the actual temperature of the water tank is equal to the set temperature, it means that the water tank temperature needs to be maintained. At this time, there is no need to change the number of units turned on, and the current number of units turned on can be kept unchanged.

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

[0071] The actual temperature of the water tank is close to the set temperature, which means that the water tank temperature needs to be maintained. At this time, for the currently turned-on unit, close its first valve, open its second valve and third valve, so that the currently turned-on unit can run in parallel to achieve circulating heating of hot water with good operating performance and stability.

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

[0073] When the actual temperature of the water tank is greater than the set temperature, it means that the water tank temperature needs to be lowered and some units need to be shut down. The number of shut-down units corresponding to different temperature difference intervals can be preset. 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 shut-down units 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, the more units need to be shut down. Therefore, the number of units turned on 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 meet user needs in a timely manner.

[0074] After determining the number of units that need to be shut down, the units that need to be shut down can be determined based on the unit energy efficiency ratio, thereby improving the system energy efficiency, specifically: obtaining the energy efficiency ratio of each unit that is currently in the on state at its current inlet water temperature, and giving priority to shutting down units with low energy efficiency ratios. Specifically, the energy efficiency ratios of each unit at different inlet water temperatures can be tested and stored in advance, so that the energy efficiency ratios of each unit that is currently in the on state at its current inlet water temperature can be directly read as a basis for judgment, and of course, it can also be calculated in real time.

[0075] Control all valve components so that the currently turned-on units are connected in parallel and the currently turned-off units do not participate in the water circulation, including: controlling the first valve corresponding to the currently turned-on units to be closed, and the second and third valves to be opened; controlling the first and second valves corresponding to the currently turned-off units to be closed, and the third valve to be opened. Through this specific control, the turned-off units can be simply and quickly separated from the water flow path to avoid flow loss, and the turned-on units can be simply and quickly connected in parallel, meeting user needs while ensuring optimal system energy efficiency.

[0076] The actual temperature of the water tank is greater than the set temperature, indicating that the water tank temperature needs to be lowered. At this time, the units with low energy efficiency ratio under the current working conditions can be shut down first. For each unit currently turned on, close its first valve and open its second valve and third valve to make the currently turned on units run in parallel, realize the circulation heating of hot water, and have good operating performance and stability.

[0077] The control of the heat pump hot water system is described below in conjunction with a specific embodiment. However, it is worth noting that this specific embodiment is only for better illustrating the present application and does not constitute an improper limitation on the present application. The explanation of terms that are the same or corresponding to the above embodiment will not be repeated in this embodiment.

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

[0079] S401, the heat pump hot water system is turned on and the unit is heating.

[0080] S402, detecting the actual temperature of the water tank and determining the optimal connection method for each unit.

[0081] S403, the water tank needs to be heated up, and the turned-on units are connected in series, specifically: the first valve is opened, and the second valve and the third valve are closed, so as to realize the connection of the units currently in the turned-on state in series.

[0082] S404, the water tank needs to be kept warm, and the turned-on units are connected in parallel, specifically: the first valve is closed, and the second valve and the third valve are opened to achieve parallel connection of the units currently in the turned-on state.

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

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

[0085] The unit in the closed state needs to be disconnected from the water flow path, specifically: the first valve and the second valve are closed, and the third valve is opened.

[0086] Example 3

[0087] This embodiment provides a non-volatile computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the control method of the heat pump hot water system described in the above embodiment is implemented.

[0088] Example 4

[0089] This embodiment provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the control method of the heat pump hot water system described in the above embodiment when executing the computer program.

[0090] Figure 5 is a schematic diagram of the hardware structure of an electronic device provided by an embodiment of the present invention, such as Figure 5 As shown, the electronic device includes:

[0091] One or more processors 510 and memory 520, Figure 5 A processor 510 is taken as an example.

[0092] The electronic device may further include: 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 may be connected via a bus or other means. Figure 5 The example of connecting through bus is taken in the following.

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

[0095] The memory 520 may include a program storage area and a data storage area, wherein the program storage area may store an operating device and an application required for at least one function; the data storage area may store performance data of each unit under different working conditions obtained in advance. In addition, the memory 520 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[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 include 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, the control method of the heat pump hot water system is performed.

[0098] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0099] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for 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 invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat pump hot water system, comprising a water tank and n units, n ≥ 2, each unit being connected to a water inlet pipeline and a water outlet pipeline, characterized in that: The inlet water temperature corresponding to each unit when it is at its own optimal energy efficiency ratio is different, and the n units are sorted in order according to the size of the inlet water temperature, so that when all 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 it is at its own optimal energy efficiency ratio is the smallest among the n units, and the inlet water temperature corresponding to the nth unit when it is at its own optimal energy efficiency ratio is the largest among the n units; Each unit except the first unit is provided with a corresponding valve assembly, and the valve assembly is used to control whether the corresponding unit participates in the water circulation and change the series and parallel connection mode of the units.

2. The heat pump hot water system according to claim 1, characterized in that: 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 pipe of the unit is connected to the water outlet pipe of the previous unit through the first valve, the water inlet pipe of the unit is connected to the water outlet pipe of the water tank through the second valve, and the water outlet pipe of the unit is connected to the water outlet pipe of the previous unit through the third valve.

3. A control method for a heat pump hot water system, characterized in that: Applied to the heat pump hot water system according to claim 1 or 2, the method comprises: Detect the actual temperature of the water tank; According to the actual temperature of the water tank and the set temperature, the start and stop of the unit is controlled and the valve assembly is controlled to change the series and parallel connection mode of the unit to optimize the energy efficiency ratio of the system.

4. The method according to claim 3, characterized in that According to the actual temperature of the water tank and the set temperature, the unit is controlled to start and stop and the valve assembly is controlled to change the series and parallel connection mode of the unit to optimize the system energy efficiency ratio, including: If the actual temperature of the water tank is lower than the set temperature, 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, the units to be turned on are determined according to the energy efficiency ratio of the units, and all valve components are controlled so that the currently turned on units are connected in series and the currently turned off units do not participate in the water circulation; If the actual temperature of the water tank is equal to the set temperature, the number of units currently turned on is kept unchanged, and all valve components are controlled so that the units currently turned on are connected in parallel and the units currently turned off do not participate in the water circulation; If the actual temperature of the water tank is greater than the set temperature, the number of units opened is controlled according to the absolute value of the difference between the actual temperature of the water tank and the set temperature, the units that need to be closed are determined according to the energy efficiency ratio of the units, and all valve components are controlled so that the currently opened units are connected in parallel and the currently closed units do not participate in the water circulation.

5. The method according to claim 4, characterized in that The units that need to be turned on are determined according to the energy efficiency ratios of the units, including: obtaining the energy efficiency ratios of the units that are currently in a closed state at their respective current inlet water temperatures, and giving priority to turning on the units with high energy efficiency ratios.

6. The method according to claim 4, characterized in that The units that need to be shut down are determined according to the energy efficiency ratios of the units, including: obtaining the energy efficiency ratios of the units that are currently turned on at their respective current inlet water temperatures, and giving priority to shutting down the units with low energy efficiency ratios.

7. The method according to claim 4, characterized in that Control all valve components so that the currently open units are connected in series and the currently closed units do not participate in the water circulation, including: Control the first valve corresponding to the currently turned-on unit to open, and the second valve and the third valve to close; The first valve and the second valve corresponding to the currently closed unit are controlled to be closed, and the third valve is controlled to be opened.

8. The method according to claim 4, characterized in that Control all valve components so that the currently open units are connected in parallel and the currently closed units do not participate in the water circulation, including: Control the first valve corresponding to the currently turned-on unit to close, and the second valve and the third valve to open; The first valve and the second valve corresponding to the currently closed unit are controlled to be closed, and the third valve is controlled 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, wherein the processor implements the control method for the heat pump hot water system according to any one of claims 3 to 8 when executing the computer program.

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

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