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

Abstract

The invention discloses a heat pump water heater system and a control method thereof, electronic equipment and a storage medium, and the control method of the heat pump water heater system comprises the following steps: in a heating mode, obtaining the temperature Ts of a radiator arranged at a main flow path outlet of a subcooler and the outdoor environment temperature Th; according to the temperature Ts of the radiator and the outdoor environment temperature Th, the opening and closing of a second electronic expansion valve between an outlet of a first electronic expansion valve of a main circulation loop in the heat pump water heater system and an inlet of a supercooled auxiliary flow path are determined; the heat absorption effect of refrigerants can be improved, the limit working condition operation requirement of the heat pump water heater is effectively improved, the product reliability is improved, and the heat dissipation capacity is enhanced.

Description

Technical Field

[0001] This invention relates to the field of heat pump technology, and in particular to a heat pump water heater system and its control method, electronic equipment, and storage medium. Background Technology

[0002] Air source heat pump water heaters are devices that use heat from the air to produce hot water, featuring high efficiency and energy saving. With increasing demands for energy conservation, more and more heat pump water heaters are now using inverter technology. However, heat dissipation of the inverter module is a critical issue. The industry generally employs refrigerant cooling to reduce module temperature or selects module components with higher temperature resistance.

[0003] However, the refrigerant cooling method refers to the refrigerant being condensed in the condenser and then entering the electronic control heat sink to exchange heat with the electronic control to reduce the module temperature. Since the refrigerant only undergoes condensation, under high water temperature conditions, the condensation temperature is relatively high, resulting in a poor cooling effect on the electronic control. Under extreme high temperature conditions, it is still necessary to limit the compressor frequency to meet the heating requirements of the electronic control, which affects the product's output capacity. Summary of the Invention

[0004] To address the problem of poor heat dissipation in controllers in existing technologies, this invention provides a heat pump water heater system and its control method, electronic equipment, and storage medium.

[0005] The present invention adopts the following technical solution: The first aspect of this invention provides a control method for a heat pump water heater system, comprising the following steps: In heating mode, the temperature Ts of the radiator set at the main outlet of the subcooler and the outdoor ambient temperature Th are obtained. Based on the radiator temperature Ts and the outdoor ambient temperature Th, determine the opening and closing of the second electronic expansion valve between the outlet of the first electronic expansion valve in the main circulation loop of the heat pump water heater system and the inlet of the subcooled auxiliary flow path.

[0006] According to the control method, if the difference between the radiator temperature Ts and the outdoor ambient temperature Th is greater than the temperature difference threshold, and the radiator temperature Ts is greater than the first temperature threshold, then the second electronic expansion valve is opened. If the difference between the radiator temperature Ts and the outdoor ambient temperature Th is less than or equal to the temperature difference threshold, and the radiator temperature Ts is less than the second temperature threshold, then the second electronic expansion valve is closed. Otherwise, the current state of the second electronic expansion valve shall be maintained; The first temperature threshold is greater than the second temperature threshold.

[0007] According to the control method, when the second electronic expansion valve is in the open state, if the temperature Ts of the radiator is greater than the first temperature threshold, the opening degree of the second electronic expansion valve is increased; if the temperature Ts of the radiator is less than the third temperature threshold, the opening degree of the second electronic expansion valve is decreased; if the temperature Ts of the radiator is less than or equal to the first temperature threshold and greater than or equal to the third temperature threshold, the current opening degree of the second electronic expansion valve is maintained. The second temperature threshold < the third temperature threshold < the first temperature threshold.

[0008] According to the control method described above, the inlet water temperature of the water-side heat exchanger is obtained; The opening and closing of the bypass solenoid valve between the inlet and outlet of the refrigerant flow path of the water-side heat exchanger is controlled based on the inlet water temperature Tw of the water-side heat exchanger, the outdoor ambient temperature Th, and the radiator temperature sensing bulb temperature Ts.

[0009] According to the control method, when the inlet water temperature Tw of the water-side heat exchanger is less than the outdoor ambient temperature Th, and the difference between the radiator temperature Ts and the outdoor ambient temperature Th is less than a preset difference, the bypass solenoid valve is opened; otherwise, the bypass solenoid valve is closed.

[0010] A second aspect of the present invention provides a heat pump water heater system for performing the above-described control method, comprising: a main circulation loop, an ambient temperature sensing element, a radiator temperature sensing element, and a controller; The refrigerant in the main circulation loop passes sequentially through the compressor's exhaust port, four-way valve, water-side heat exchanger, subcooled main flow path, first electronic expansion valve, and evaporator, and then re-enters the compressor's suction port through the four-way valve. A radiator is provided at the main flow outlet of the subcooler; A second electronic expansion valve is provided between the outlet of the first electronic expansion valve and the inlet of the auxiliary flow path of the subcooler; An ambient temperature sensor is installed at the evaporator to obtain the outdoor ambient temperature. A radiator temperature sensor is installed at the radiator to obtain the temperature of the radiator. The controller is connected to the ambient temperature sensor and the radiator temperature sensor, and controls the opening and closing of the second electronic expansion valve based on the outdoor ambient temperature sent by the ambient temperature sensor and the radiator temperature sent by the radiator temperature sensor.

[0011] According to the heat pump water heater system, a bypass solenoid valve is provided between the inlet and outlet of the refrigerant flow path of the heat exchanger.

[0012] According to the heat pump water heater system, the water-side heat exchanger is equipped with an inlet temperature sensor on the inlet side to obtain the inlet water temperature.

[0013] A third aspect of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when loaded onto the processor, implements the control method described above.

[0014] A fourth aspect of the present invention provides a storage medium comprising a stored program, wherein the program, when running, controls the device where the storage medium is located to execute the control method described above.

[0015] Compared with the prior art, the beneficial effects of the present invention include at least the following: This invention can improve the heat absorption effect of refrigerant, effectively improve the extreme operating conditions of heat pump water heaters, improve product reliability, and enhance heat dissipation capacity. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a flowchart of the control method for the heat pump water heater system of the present invention; Figure 2 This is a schematic diagram of the heat pump water heater system of the present invention; In the diagram: 1. Compressor; 2. Four-way valve; 3. Water-side heat exchanger; 4. Subcooler; 5. First electronic expansion valve; 6. Radiator; 7. Evaporator; 8. Second electronic expansion valve; 9. Ambient temperature sensor; 10. Radiator temperature sensor; 11. Bypass solenoid valve; 12. Plate heat exchanger; 13. Third electronic expansion valve; 14. Capillary tube; 15. Check valve. Detailed Implementation

[0018] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure.

[0020] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0021] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0022] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0024] Embodiment 1 of the present invention provides a control method for a heat pump water heater, comprising the following steps: Step S110: In heating mode, obtain the temperature Ts of the radiator set at the main outlet of the subcooler and the outdoor ambient temperature Th.

[0025] Step S120: Based on the radiator temperature Ts and the outdoor ambient temperature Th, determine the opening and closing of the second electronic expansion valve between the outlet of the first electronic expansion valve of the main circulation loop and the inlet of the subcooled auxiliary flow path in the heat pump water heater system.

[0026] This invention can improve the heat absorption effect of refrigerant, effectively improve the extreme operating conditions of heat pump water heaters, improve product reliability, and enhance heat dissipation capacity.

[0027] Preferably, but not limitingly, if the difference between the radiator temperature Ts and the outdoor ambient temperature Th is greater than a temperature difference threshold, and the radiator temperature Ts is greater than a first temperature threshold, then the second electronic expansion valve is opened. If the difference between the radiator temperature Ts and the outdoor ambient temperature Th is less than or equal to the temperature difference threshold, and the radiator temperature Ts is less than the second temperature threshold, then the second electronic expansion valve is closed. Otherwise, the current state of the second electronic expansion valve is maintained.

[0028] In this invention, the refrigerant enters the subcooler after being throttled by the second electronic expansion valve, which can reduce the temperature of the refrigerant entering the radiator from the main circuit of the subcooler. By adjusting the opening of the second electronic expansion valve, the temperature of the radiator is reduced, thereby improving the heat dissipation effect of the controller board.

[0029] The first temperature threshold is greater than the second temperature threshold.

[0030] Further preferably, but not limitingly, the temperature difference threshold ranges from 20 to 50°C; the first temperature threshold ranges from 80 to 90°C; and the second temperature threshold ranges from 50 to 60°C.

[0031] Further preferred but not limiting, when the second electronic expansion valve is in the open state, if the temperature Ts of the radiator is greater than the first temperature threshold, the opening degree of the second electronic expansion valve is increased; if the temperature Ts of the radiator is less than the third temperature threshold, the opening degree of the second electronic expansion valve is decreased; if the temperature Ts of the radiator is less than or equal to the first temperature threshold and greater than or equal to the third temperature threshold, the current opening degree of the second electronic expansion valve is maintained. The second temperature threshold < the third temperature threshold < the first temperature threshold.

[0032] The third temperature threshold ranges from 60 to 70°C.

[0033] This invention can improve the heat dissipation effect of the controller.

[0034] Preferably, but not limitingly, the inlet water temperature of the water-side heat exchanger is obtained; The opening and closing of the bypass solenoid valve between the inlet and outlet of the refrigerant flow path of the water-side heat exchanger is controlled based on the inlet water temperature Tw of the water-side heat exchanger, the outdoor ambient temperature Th, and the radiator temperature sensing bulb temperature Ts.

[0035] This invention can prevent condensation from occurring in the electronic control system under low water temperature conditions, where the refrigerant temperature is lower than the ambient dew point temperature due to the low condensation temperature.

[0036] Further preferred but not limiting, when the inlet water temperature Tw of the water-side heat exchanger is less than the outdoor ambient temperature Th, and the difference between the radiator temperature Ts and the outdoor ambient temperature Th is less than a preset difference, the bypass solenoid valve is opened; otherwise, the bypass solenoid valve is closed.

[0037] The preset difference is a negative number, and the preset difference is related to the dew point temperature of the outdoor ambient temperature at this time. The preset difference can be obtained through a humid-enthalpy diagram.

[0038] When the inlet water temperature Tw of the water-side heat exchanger is lower than the outdoor ambient temperature Th, and the difference between the radiator temperature Ts and the outdoor ambient temperature Th is less than a preset difference, the radiator is at risk of condensation. In this case, the bypass solenoid valve of the water-side heat exchanger needs to be opened to increase the temperature of the refrigerant entering the radiator and prevent the radiator temperature from falling below the dew point temperature of the outdoor ambient temperature. This invention can enhance the heat dissipation effect of the controller under high ambient temperature conditions, and at the same time avoid the risk of condensation on the controller radiator under low water temperature conditions.

[0039] like Figure 2As shown, an air source heat pump water heater system provided in Embodiment 2 of the present invention includes: a main circulation loop, an ambient temperature sensing element 9, a radiator temperature sensing element 10, and a controller; The refrigerant in the main circulation loop passes sequentially through the exhaust port of compressor 1, four-way valve 2, water-side heat exchanger 3, main flow path of subcooling 4, first electronic expansion valve 5 and evaporator 7, and then enters the suction port of compressor 1 again through four-way valve 2. A radiator 6 is provided at the main flow outlet of the subcooler; A second electronic expansion valve 8 is provided between the outlet of the first electronic expansion valve 5 and the inlet of the auxiliary flow path of the subcooler 4; An ambient temperature sensor 9 is located at the evaporator 7 and is used to obtain the outdoor ambient temperature. A radiator temperature sensor 10 is installed at the radiator 6 to obtain the temperature of the radiator. The controller is connected to the ambient temperature sensor 9 and the radiator temperature sensor 10. Based on the outdoor ambient temperature sent by the ambient temperature sensor 9 and the radiator temperature sent by the radiator temperature sensor 10, the controller controls the opening and closing of the second electronic expansion valve 8.

[0040] A bypass solenoid valve 11 is provided between the inlet and outlet of the refrigerant flow path of the heat exchanger.

[0041] The water-side heat exchanger is equipped with an inlet water temperature sensor on the inlet side to obtain the inlet water temperature.

[0042] Preferably, but not limitingly, the main flow path of the subcooler 4 is connected to the main flow path of the plate heat exchanger 12, and the main flow path of the plate heat exchanger 12 is connected to the first electronic expansion valve 5; the outlet of the main flow path of the plate heat exchanger 12 is connected to the auxiliary flow path of the plate heat exchanger 12 through the third electronic expansion valve 13, and the auxiliary flow path of the plate heat exchanger 12 is connected to the enthalpy-increasing port of the compressor 1.

[0043] Preferably, but not limitingly, a capillary tube 14 and a one-way valve 15 are sequentially provided after the bypass solenoid valve 11.

[0044] The radiator 6 is located at the controller.

[0045] The evaporator is equipped with a fan at 7 locations.

[0046] Embodiment 3 of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded onto the processor, it implements the control method described above.

[0047] Embodiment 4 of the present invention provides a storage medium, the storage medium including a stored program, wherein the program controls the device where the storage medium is located to execute the above-described control method when it is running.

[0048] Storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Storage media can be, for example, but not limited to, electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination thereof. More specific examples of storage media (a non-exhaustive list) include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination thereof. Storage media as used herein is not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0049] The computer-readable program instructions described herein can be downloaded from storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper cables, fiber optic cables, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to storage media within the respective computing / processing device.

[0050] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A control method for a heat pump water heater system, characterized in that, Includes the following steps: In heating mode, the temperature Ts of the radiator set at the main outlet of the subcooler and the outdoor ambient temperature Th are obtained. Based on the radiator temperature Ts and the outdoor ambient temperature Th, determine the opening and closing of the second electronic expansion valve between the outlet of the first electronic expansion valve in the main circulation loop of the heat pump water heater system and the inlet of the subcooled auxiliary flow path.

2. The control method according to claim 1, characterized in that: If the difference between the radiator temperature Ts and the outdoor ambient temperature Th is greater than the temperature difference threshold, and the radiator temperature Ts is greater than the first temperature threshold, then the second electronic expansion valve is opened. If the difference between the radiator temperature Ts and the outdoor ambient temperature Th is less than or equal to the temperature difference threshold, and the radiator temperature Ts is less than the second temperature threshold, then the second electronic expansion valve is closed. Otherwise, the current state of the second electronic expansion valve shall be maintained; The first temperature threshold is greater than the second temperature threshold.

3. The control method according to claim 2, characterized in that: When the second electronic expansion valve is in the open state, if the temperature Ts of the radiator is greater than the first temperature threshold, the opening of the second electronic expansion valve is increased; if the temperature Ts of the radiator is less than the third temperature threshold, the opening of the second electronic expansion valve is decreased; if the temperature Ts of the radiator is less than or equal to the first temperature threshold and greater than or equal to the third temperature threshold, the current opening of the second electronic expansion valve is maintained. The second temperature threshold < the third temperature threshold < the first temperature threshold.

4. The control method according to claim 1, characterized in that: Obtain the inlet water temperature of the water-side heat exchanger; The opening and closing of the bypass solenoid valve between the inlet and outlet of the refrigerant flow path of the water-side heat exchanger is controlled based on the inlet water temperature Tw of the water-side heat exchanger, the outdoor ambient temperature Th, and the radiator temperature sensing bulb temperature Ts.

5. The control method according to claim 4, characterized in that: When the inlet water temperature Tw of the water-side heat exchanger is less than the outdoor ambient temperature Th, and the difference between the radiator temperature Ts and the outdoor ambient temperature Th is less than the preset difference, the bypass solenoid valve is opened. Conversely, the bypass solenoid valve will be closed.

6. A heat pump water heater system for executing the control method according to any one of claims 1-5, characterized in that, include: The main circulation loop, ambient temperature sensor (9), radiator temperature sensor (10), and controller; The refrigerant in the main circulation loop passes through the exhaust port of the compressor (1), the four-way valve (2), the water-side heat exchanger (3), the main flow path of the subcooling (4), the first electronic expansion valve (5), and the evaporator (7) in sequence, and then enters the suction port of the compressor (1) again through the four-way valve (2). A radiator (6) is provided at the main outlet of the subcooler. A second electronic expansion valve (8) is provided between the outlet of the first electronic expansion valve (5) and the inlet of the auxiliary flow path of the subcooler (4); the outlet of the auxiliary flow path of the subcooler (4) is connected to the suction port of the compressor (1); The ambient temperature sensing element (9) is located at the evaporator (7) and is used to obtain the outdoor ambient temperature. The radiator temperature sensor (10) is located at the radiator (6) and is used to obtain the temperature of the radiator. The controller is connected to the ambient temperature sensor (9) and the radiator temperature sensor (10). Based on the outdoor ambient temperature sent by the ambient temperature sensor (9) and the radiator temperature sent by the radiator temperature sensor (10), the controller controls the opening and closing of the second electronic expansion valve (8).

7. The heat pump water heater system according to claim 6, characterized in that: A bypass solenoid valve (11) is provided between the inlet and outlet of the refrigerant flow path of the heat exchanger.

8. The heat pump water heater system according to claim 6, characterized in that: The water-side heat exchanger is equipped with an inlet water temperature sensor on the inlet side to obtain the inlet water temperature.

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, When the computer program is loaded into the processor, it implements the control method according to any one of claims 1-5.

10. A storage medium, characterized in that: The storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the storage medium to perform the control method according to any one of claims 1-5.

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