Dual source heat pump system and control method

Abstract

The application discloses a dual-source heat pump system and a control method, and belongs to the technical field of heat pumps. The system comprises a solar water heater, a first water tank, a first heat exchange assembly and a heat pump assembly. The solar water heater is connected with the first water tank. The first heat exchange assembly is connected with the first water tank through a first power pump. The first heat exchange assembly is connected with a first valve. One end of the first valve is connected with a second power pump. The second power pump is connected with a first pipeline. The first pipeline is used for connecting a return water pipe of a terminal system. The heat pump assembly is connected with a second pipeline. The second pipeline is used for connecting a water supply pipe of the terminal system. The heat pump assembly comprises an air heat exchanger, a second heat exchange assembly, a compressor and a condenser. The first water tank is connected with the second heat exchange assembly. The first heat exchange assembly is connected with the second heat exchange assembly. The second heat exchange assembly and the air heat exchanger are connected with the compressor. The compressor is connected with the condenser. The condenser is connected with the compressor and the air heat exchanger respectively.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, and in particular to a dual-source heat pump system and control method. Background Technology

[0002] Existing conventional water source heat pump units typically use natural heat sources or circulating water heat sources as low-grade heat inputs. The heat source grade is improved through the circulation process of the heat pump system, thereby obtaining medium- to high-grade hot water to meet heating or domestic water needs. However, these conventional water source heat pump units generally suffer from insufficient heat source supply and switching capabilities. Specifically, the heat pump unit can only rely on a single type of low-grade heat source from either natural or circulating water sources. When the supply of this type of heat source is interrupted or insufficient, it cannot effectively absorb low-grade heat energy, making it difficult to meet heating or domestic water needs, thus hindering the heating of the terminal systems connected to the heat pump unit. Summary of the Invention

[0003] This application aims to provide a dual-source heat pump system and control method, which at least solves the problem of heating the terminal system connected to the heat pump unit.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application provide a dual-source heat pump system, the dual-source heat pump system comprising: a solar water heater, a first water tank, a first heat exchange component, and a heat pump component; The solar water heater is connected to the first water tank, the first heat exchange component is connected to the first water tank through a first power pump, the first heat exchange component is connected to a first valve, one end of the first valve is connected to a second power pump, the second power pump is connected to a first pipe, and the first pipe is used to connect to the return water pipe of the terminal system. The heat pump assembly is connected to a second pipe, which is used to connect to the water supply pipe of the terminal system. The heat pump assembly includes an air heat exchanger, a second heat exchange component, a compressor, and a condenser. The first water tank is connected to the second heat exchange component, the first heat exchange component is connected to the second heat exchange component, the second heat exchange component and the air heat exchanger are both connected to the compressor, the compressor is connected to the condenser, and the condenser is connected to both the compressor and the air heat exchanger. One end of the second pipe is connected to the condenser.

[0005] Optionally, the dual-source heat pump system further includes a second valve; One end of the second valve is connected to the first pipe, and the other end of the second valve is connected to the second pipe.

[0006] Optionally, the dual-source heat pump system further includes a second water tank; One end of the second power pump is connected to the second water tank, and the second water tank is connected to the first pipe.

[0007] Optionally, the first valve is a three-way valve, with the first end of the first valve connected to the second power pump, the second end of the first valve connected to the first heat exchange assembly, and the third end of the first valve connected to the condenser.

[0008] Optionally, the dual-source heat pump system further includes a third power pump; One end of the third power pump is connected to the first water tank, and the other end of the third power pump is connected to the solar water heater.

[0009] Optionally, the dual-source heat pump system further includes a cooling tower fan; The cooling tower fan is connected to the second heat exchange component, and the cooling tower fan is used to transfer cold liquid to the second heat exchange component so that the heat pump component can cool.

[0010] Secondly, embodiments of this application also provide a control method for controlling a dual-source heat pump system as described in any one of the first aspects above, wherein the dual-source heat pump system includes a second valve and a third power pump, and the control method includes: Obtain the first temperature value of the solar water heater and the second temperature value of the first water tank; Based on the first temperature value and the second temperature value, the first power pump, the second power pump, the third power pump, the first valve, and the second valve are controlled.

[0011] Optionally, controlling the first power pump, the second power pump, the third power pump, the first valve, and the second valve based on the first temperature value and the second temperature value includes: When the first temperature value is less than the first set temperature threshold and the first temperature value is greater than or equal to the sum of the second temperature value and the second set temperature threshold, the third power pump is controlled to start and run, the first power pump and the second power pump are both controlled to shut down, and the first valve and the second valve are both controlled to shut down. If the first temperature value is less than or equal to the sum of the second temperature value and the third set temperature threshold, or if the second temperature value is greater than the fourth set temperature threshold, the third power pump is controlled to shut down. When the second temperature value is greater than or equal to the fifth set temperature threshold, the second valve and the third power pump are controlled to close, and the first power pump, the second power pump, and the first valve are all controlled to open. When the second temperature value is less than the fifth set temperature threshold and the second temperature value is greater than the sixth set temperature threshold, the first valve, the second valve, and the third power pump are all closed, and the first power pump and the second power pump are all turned on. When the second temperature value is less than the sixth set temperature threshold, both the first valve and the second valve are closed, and both the first power pump and the third power pump are closed, while the second power pump is turned on; wherein the second set temperature threshold, the third set temperature threshold, and the fourth set temperature threshold are all less than the first set temperature threshold, the second set temperature threshold is greater than the third set temperature threshold, the second set temperature threshold and the third set temperature threshold are both less than the fourth set temperature threshold, the fifth set temperature threshold and the sixth set temperature threshold are both less than the fourth set temperature threshold, and the sixth set temperature threshold is less than the fifth set temperature threshold.

[0012] Optionally, the control method further includes: Obtain the current time point of the dual-source heat pump system; Based on the current time point of the dual-source heat pump system, the first power pump, the second power pump, the third power pump, the first valve, and the second valve are controlled.

[0013] Optionally, controlling the first power pump, the second power pump, the third power pump, the first valve, and the second valve based on the current time point of the dual-source heat pump system includes: When the dual-source heat pump system is in a first set time period, the first power pump, the second power pump, the first valve, and the second valve are all opened, and the third power pump is closed; wherein, the first set time period is a time period during night.

[0014] In this embodiment, since the solar water heater is connected to the first water tank, the liquid in the first water tank can be heated by the solar water heater. Since the first heat exchange component is connected to the first water tank via a first power pump, when the first power pump is running, the liquid in the first water tank can be pumped to the first heat exchange component, allowing the liquid to exchange heat within the first heat exchange component. Since the first heat exchange component is connected to a first valve, one end of which is connected to a second power pump, which is connected to a first pipe, after connecting the first pipe to the return water pipe of the terminal system, the first power pump can pump the liquid in the return water pipe to the first valve, and then transmit it to the first heat exchange component, where it is heated by the liquid in the first water tank. This is equivalent to heating the liquid in the first water tank via the solar water heater, ultimately heating the liquid in the return water pipe of the terminal system, which is equivalent to using solar energy to heat the liquid in the return water pipe of the terminal system. Since the heat pump component is connected to a second pipe, the second pipe can be connected to the water supply pipe of the terminal system, allowing the liquid flowing from the heat pump component to enter the water supply pipe of the terminal system. Because the first water tank is connected to the second heat exchange component, the first heat exchange component is connected to the second heat exchange component, the second heat exchange component and the air heat exchanger are both connected to the compressor, the compressor is connected to the condenser, and the condenser is connected to both the compressor and the air heat exchanger, the liquid in the first water tank can flow into the second heat exchange component, and the liquid in the first heat exchange component can also flow into the second heat exchange component. The refrigerant in the second heat exchange component can flow into the compressor, which can compress the refrigerant. The high-temperature refrigerant after compression flows into the condenser, and the heat from the first heat exchange component can be obtained from the first water tank. This is equivalent to using solar energy to heat the first water tank, which in turn is equivalent to using solar energy to heat the refrigerant in the second heat exchange component, enabling the heat pump component to heat. Furthermore, the air heat exchanger is connected to the compressor, so the refrigerant in the air heat exchanger can also flow into the compressor. After compression by the compressor, the high-temperature refrigerant flows into the condenser, which is equivalent to using the heat from the air to heat the heat pump component. In other words, in this embodiment, not only can solar energy be used to heat the heat pump component, but the heat of the air can also be used to heat the heat pump component. That is, in this application, heat can be extracted from solar energy or from the air, making the heat source dual-source, which is beneficial for the heat pump component to extract heat according to actual needs and facilitates heating of the terminal system.

[0015] Furthermore, the dual-source heat pump system provided in this application also has the following effects: (1) Compared with the traditional hot water system, the first heat exchange component and the second pipe in the dual-source heat pump system provided in this application are respectively connected to the terminal return water pipe and the supply water pipe, directly serving the floor heating or radiator at the heating end, that is, the terminal direct heating connection, so that the solar heat can directly serve the terminal heating, rather than just being used for hot water storage, thus improving the direct utilization rate of heat energy; (2) The dual-source heat pump system of this application adopts a dual heat exchange component collaborative strategy, specifically: the first heat exchange component is connected to the second heat exchange component and the water tank is also connected to the second heat exchange component, forming a multi-stage heat exchange path of "water tank-first heat exchange-second heat exchange", which can realize the utilization of tiered temperature; (3) The first heat exchange component of the dual-source heat pump system of this application is connected in series with the first power pump, the first valve and the second power pump to form a multi-stage flow regulation and pressure control mechanism, which is more accurate than the single pump design flow control. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This diagram illustrates a dual-source heat pump system provided in an embodiment of this application. Figure 2 This is a schematic diagram illustrating another dual-source heat pump system provided in an embodiment of this application; Figure 3 This is a flowchart illustrating a control method provided in an embodiment of this application.

[0017] Figure label: 10: Solar water heater; 20: First water tank; 30: First heat exchange component; 40: Heat pump component; 401: Air heat exchanger; 402: Second heat exchange component; 403: Compressor; 404: Condenser; 405: Economizer; 406: Liquid receiver; 407: Liquid cooler; 408: Four-way valve; 409: Gas-liquid separator; 410: First circulation pump; 411: Second circulation pump; 412: Third circulation pump; 413: First control valve; 414: Second control valve; 415: Third control valve; 416: Fourth control valve; 41 7: Fifth control valve; 418: First check valve; 419: Second check valve; 420: Third check valve; 421: Fourth check valve; 422: Fifth check valve; 423: First connecting pipe; 424: Second connecting pipe; 425: Third connecting pipe; 426: Fourth connecting pipe; 50: First power pump; 60: First valve; 70: Second power pump; 80: First pipeline; 90: Second pipeline; 100: Second valve; 110: Second water tank; 120: Third power pump; 130: Cooling tower fan; 200: Terminal system. Detailed Implementation

[0018] To facilitate a clear description of the technical solutions in the embodiments of the present invention, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect. For example, the first threshold and the second threshold are merely used to distinguish different thresholds and do not limit their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that the terms "first" and "second" are not necessarily different.

[0019] It should be noted that in this invention, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0020] In this invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b, or c" can represent: a, b, c, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] This application provides a dual-source heat pump system, such as... Figure 1 and Figure 2 As shown, the dual-source heat pump system includes: a solar water heater 10, a first water tank 20, a first heat exchange component 30, and a heat pump component 40; the solar water heater 10 is connected to the first water tank 20, the first heat exchange component 30 is connected to the first water tank 20 via a first power pump 50, the first heat exchange component 30 is connected to a first valve 60, one end of the first valve 60 is connected to a second power pump 70, the second power pump 70 is connected to a first pipe 80, the first pipe 80 is used to connect to the return water pipe of the terminal system; the heat pump component 40 is connected to a second pipe 90, the second pipe 90 is used to... The water supply pipe connecting to the terminal system, the heat pump assembly 40 includes an air heat exchanger 401, a second heat exchange assembly 402, a compressor 403 and a condenser 404, a first water tank 20 connected to the second heat exchange assembly 402, a first heat exchange assembly 30 connected to the second heat exchange assembly 402, the second heat exchange assembly 402 and the air heat exchanger 401 both connected to the compressor 403, the compressor 403 connected to the condenser 404, and the condenser 404 connected to both the compressor 403 and the air heat exchanger 401; wherein, one end of the second pipe 90 is connected to the condenser 404.

[0024] In this embodiment, since the solar water heater 10 is connected to the first water tank 20, the liquid in the first water tank 20 can be heated by the solar water heater 10. Since the first heat exchange component 30 is connected to the first water tank 20 through the first power pump 50, when the first power pump 50 is running, the liquid in the first water tank 20 can be pumped to the first heat exchange component 30, so that the liquid can exchange heat in the first heat exchange component 30. Since the first heat exchange component 30 is connected to the first valve 60, and one end of the first valve 60 is connected to the second power pump 70, which is connected to the first pipe 80, after connecting the first pipe 80 to the return water pipe of the terminal system, the first power pump 50 can pump the liquid in the return water pipe to the first valve 60, and then transfer it to the first heat exchange component 30 through the first valve 60. This allows the liquid in the first water tank 20 to exchange heat with the liquid in the first heat exchange component 30, which is equivalent to heating the liquid in the first water tank 20 through the solar water heater 10, ultimately heating the liquid in the return water pipe of the terminal system. This is equivalent to using solar energy to heat the liquid in the return water pipe of the terminal system. Since the heat pump component 40 is connected to the second pipe 90, the second pipe 90 can be connected to the water supply pipe of the terminal system, allowing the liquid flowing from the heat pump component 40 to enter the water supply pipe of the terminal system. Since the first water tank 20 is connected to the second heat exchange assembly 402, the first heat exchange assembly 30 is connected to the second heat exchange assembly 402, the second heat exchange assembly 402 and the air heat exchanger 401 are both connected to the compressor 403, the compressor 403 is connected to the condenser 404, and the condenser 404 is connected to both the compressor 403 and the air heat exchanger 401, the liquid in the first water tank 20 can flow into the second heat exchange assembly 402, and the liquid in the first heat exchange assembly 30 can also flow into the second heat exchange assembly 402. The refrigerant in the second heat exchange assembly 402 can flow into the compressor 403, and the compressor 403 can compress the refrigerant. The high-temperature refrigerant, after compression, flows into the condenser 404. The heat from the first heat exchange component 30 can be obtained from the first water tank 20, effectively heating the first water tank 20 using solar energy. This, in turn, heats the refrigerant in the second heat exchange component 402 using solar energy, enabling the heat pump component 40 to heat. Furthermore, the air heat exchanger 401 is connected to the compressor 403, allowing the refrigerant in the air heat exchanger 401 to flow into the compressor 403. The compressed, high-temperature refrigerant then flows into the condenser 404, effectively heating the heat pump component 40 using the heat from the air. In other words, in this embodiment, the heat pump component 40 can be heated not only using solar energy but also using the heat from the air. This dual-source approach allows the heat pump component 40 to extract heat according to actual needs, facilitating the heating of the terminal system.

[0025] It should be noted that in this embodiment, the terminal system can be an air conditioning system, or it can be a floor heating system. The specific type of terminal system is not limited in this embodiment.

[0026] In addition, in this embodiment, the heat pump assembly 40 may further include an economizer 405, a liquid receiver 406, and a liquid cooler 407. The liquid receiver 406 may be connected to the condenser 404, the liquid cooler 407 may be connected to the liquid receiver 406, the economizer 405 may be connected to the liquid cooler 407, and the compressor 403 and the air heat exchanger 401 may be connected to the economizer 405. The economizer 405 can improve energy efficiency, reduce exhaust temperature, and enhance low-temperature heating capacity, while the liquid receiver 406 can store liquid.

[0027] In addition, in this embodiment, the heat pump assembly 40 further includes a four-way valve 408, a gas-liquid separator 409, a first circulating pump 410, a second circulating pump 411, a third circulating pump 412, a first control valve 413, a second control valve 414, a third control valve 415, a fourth control valve 416, a fifth control valve 417, a first check valve 418, a second check valve 419, a third check valve 420, a fourth check valve 421, and a fifth check valve 422; one end of a flow channel of the second heat exchange assembly 402 is connected to one end of the first control valve 413 and one end of the second control valve 414, the other end of the first control valve 413 and the other end of the second control valve 414 are connected to the first end and the second end of the four-way valve 408, the third end of the four-way valve 408 is connected to the condenser 404, and the compressor 403 is connected to the fourth end of the four-way valve 408, wherein the second end of the four-way valve 408 is connected to the gas-liquid separator 409. A liquid receiver 406 is connected to a condenser 404, and is also connected to a liquid cooler 407 via a first connecting pipe 423. A first one-way valve 418 is located on the first connecting pipe 423. An economizer 405 is connected to the liquid cooler 407 via a second connecting pipe 424. The economizer 405 has a first inlet, a second inlet, a first outlet, and a second outlet. The first inlet is connected to the condenser 404 via a connecting pipe. The first connecting pipe 423 is connected to a first branch pipe, which is connected to the second inlet. A first circulating pump 410 is located on the first branch pipe. The first outlet is connected to one end of an air heat exchanger 401 via a third connecting pipe 425. A second circulating pump 411 is located on the third connecting pipe 425. The other end of the air heat exchanger 401 is connected to the first end of a four-way valve 408 via a third control valve 415. The second outlet is connected to a compressor 403. A gas-liquid separator 409 is connected to the compressor 403. The fourth control valve 416 is located on the second connecting pipe 424, and one end of the second check valve 419 is connected to one end of the fourth control valve 416. The other end of the second check valve 419 is connected to the first connecting pipe 423. One end of the third check valve 420 is connected to the other end of the fourth control valve 416. The other end of the third check valve 420 is connected to the first connecting pipe 423. The other end of one flow channel of the second heat exchange component 402 is connected to the second connecting pipe 424 through the fourth connecting pipe 426. The third circulating pump 412 is located on the second connecting pipe 424, and the fifth control valve 417 is located on the second connecting pipe 424. One end of the fourth check valve 421 is connected to one end of the fifth control valve 417. The other end of the fourth check valve 421 is connected to the second connecting pipe 424. One end of the fifth check valve 422 is connected to the other end of the fifth control valve 417. The other end of the fifth check valve 422 is connected to the second connecting pipe 424.

[0028] In addition, in this embodiment, the first heat exchange component 30 can be a plate heat exchanger, which can have at least two flow channels, each through which liquid can flow, thereby enabling heat exchange between the liquids in different flow channels. The second heat exchange component 402 can be a heat exchange tank or a plate heat exchanger, and can also have at least two flow channels, each through which liquid can flow, thereby enabling heat exchange between the liquids in different flow channels.

[0029] When the first heat exchange component 30 is a plate heat exchanger, one end of one flow channel of the plate heat exchanger can be connected to the first water tank 20 via the first power pump 50, and the other end of the flow channel can be connected to the first valve 60. One end of the other flow channel of the plate heat exchanger can be connected to one end of one flow channel of the second heat exchange component 402, and the other end of the other flow channel of the plate heat exchanger can be connected to the condenser 404.

[0030] In addition, in this embodiment, when the second heat exchange component 402 is a heat exchange tank or a plate heat exchanger, it may have three flow channels. The number of heat pump components 40 may be two, and the two heat pump components 40 may share one second heat exchange component 402, meaning one of the two heat pump components 40 may have a second heat exchange component 402. Of course, the number of heat pump components 40 may also be one. The specific number of heat pump components 40 is not limited in this embodiment.

[0031] In addition, in some embodiments, the first heat exchange component 30 and the second pipe are respectively connected to the terminal return water pipe and the supply water pipe, directly serving the underfloor heating or radiators at the heating end. This is different from the traditional hot water system, that is, the terminal is directly connected to heating, so that the solar heat can directly serve the terminal heating, rather than just being used for hot water storage, thus improving the direct utilization rate of heat energy.

[0032] Furthermore, in this embodiment, the connection between the first heat exchange component 30 and the second heat exchange component 402, and the parallel design of the air heat exchanger 401 and the second heat exchange component 402, involve specific coordinated control. The condenser 404 is simultaneously connected to both the compressor 403 and the air heat exchanger 401, forming a bidirectional heat exchange loop. Compared to traditional unidirectional connections, this allows for flexible switching of the heat exchange path under different operating conditions. Additionally, both the second heat exchange component 402 and the air heat exchanger 401 are connected to the compressor 403, forming a dual heat source input interface, allowing air source heat and solar-assisted heat to enter the heat pump cycle simultaneously or alternately.

[0033] In this embodiment, the cooperation of the first valve 60 and the second power pump 70 enables dual-mode switching, allowing the return water to directly exchange heat for heating or switch to the hot water storage tank, adapting to different seasons and load requirements. In winter, the first heat exchange component 30 can preheat the return water, which then enters the heat pump cycle through the second heat exchange component 402. Solar waste heat is used to assist the heat pump in defrosting, improving operating efficiency in low-temperature environments.

[0034] In addition, in some embodiments, the dual-source heat pump system further includes a second valve 100; one end of the second valve 100 is connected to the first pipe 80, and the other end of the second valve 100 is connected to the second pipe 90.

[0035] With this configuration, when the second valve 100 is opened, the liquid in the first pipe 80 can flow into the second pipe 90, or the liquid in the second pipe 90 can flow into the first pipe 80. This allows the liquid in the first pipe 80 to flow into the second pipe 90, or the liquid in the second pipe 90 to flow into the first pipe 80, as needed.

[0036] It should be noted that the second valve 100 can be a solenoid valve. Of course, the second valve 100 can also be other types of valves, such as an electric ball valve. In this respect, the embodiments of this application do not limit it.

[0037] In addition, in some embodiments, the dual-source heat pump system further includes a second water tank 110; one end of the second power pump 70 is connected to the second water tank 110, and the second water tank 110 is connected to the first pipe 80.

[0038] Since one end of the second power pump 70 is connected to the second water tank 110, and the second water tank 110 is connected to the first pipe 80, the liquid in the first pipe 80 can flow into the second water tank 110, and then the liquid in the second water tank 110 flows out, forming a liquid circulation flow. Alternatively, the liquid in the second water tank 110 can flow into the first pipe 80, and then form a liquid circulation flow. That is, when the liquid in the first pipe 80 is heated, the liquid in the second water tank 110 is also heated at the same time. Thus, the second water tank 110 acts as a buffer, preventing the liquid in the first pipe 80 from being heated too quickly, preventing the compressor 403 in the heat pump assembly 40 from frequently starting and stopping, and preventing the liquid in the first pipe 80 from cooling down rapidly.

[0039] It should be noted that the volume of the first water tank 20 can be greater than the volume of the second water tank 110.

[0040] In some embodiments, the first valve 60 is a three-way valve, with the first end of the first valve 60 connected to the second power pump 70, the second end of the first valve 60 connected to the first heat exchange assembly 30, and the third end of the first valve 60 connected to the condenser 404.

[0041] Since the first valve 60 is a three-way valve, which typically has three connection ends (a first end, a second end, and a third end), the first end of the first valve 60 can be connected to the second power pump 70, and the second end can be connected to the first heat exchange assembly 30. This allows the first end to be connected to the second end as needed, enabling the first heat exchange assembly 30 to connect with the first power pump 50. The first power pump 50 can then pump liquid into the first heat exchange assembly 30 or pump liquid from the first heat exchange assembly 30 outwards, facilitating the circulation of liquid within the first heat exchange assembly 30. Furthermore, the third end of the first valve 60 is connected to the condenser 404, allowing liquid in the condenser 404 to flow into the first heat exchange assembly 30 through the first valve 60 for heat exchange.

[0042] In addition, in some embodiments, the dual-source heat pump system further includes a third power pump 120; one end of the third power pump 120 is connected to the first water tank 20, and the other end of the third power pump 120 is connected to the solar water heater 10.

[0043] Since one end of the third power pump 120 is connected to the first water tank 20 and the other end is connected to the solar water heater 10, when the third power pump 120 is turned on and running, it can pump the liquid in the first water tank 20 to the solar water heater 10, thereby heating the liquid in the first water tank 20. The heated liquid can then return to the first water tank 20 due to the action of the third power pump 120. In other words, by setting up the third power pump 120, it is convenient for the solar water heater 10 to heat the liquid in the first water tank 20.

[0044] It should be noted that the solar water heater 10 can be connected to the first water inlet of the first water tank 20 through the first pipe, and the solar water heater 10 can be connected to the second water inlet of the first water tank 20 through the second pipe. The third power pump 120 is located in the second pipe. When the second power pump 70 is running, the second power pump 70 pumps the liquid in the first water tank 20 to the solar water heater 10. The liquid in the solar water heater 10 is pumped to the first water tank 20, which realizes the circulation of the liquid in the first water tank 20 and the solar water heater 10, and finally heats the liquid in the first water tank 20.

[0045] In some embodiments, the dual-source heat pump system also includes a cooling tower fan 130; the cooling tower fan 130 is connected to the second heat exchange assembly 402 and is used to transfer coolant to the second heat exchange assembly 402 so that the heat pump assembly 40 can be cooled.

[0046] Since the cooling tower fan 130 is connected to the second heat exchange component 402, the cooling tower fan 130 can transfer coolant to the second heat exchange component 402, and the second heat exchange component 402 can then transfer the cooling capacity of the coolant, enabling the heat pump component 40 to achieve a cooling effect. In other words, by setting up the cooling tower fan 130, the heat pump component 40 can achieve cooling, thus diversifying the function of the heat pump component 40; that is, the heat pump component 40 can not only generate heat but also perform cooling.

[0047] Of course, in this embodiment, the air heat exchanger 401 can also exchange heat with the environment of the heat pump assembly 40, thereby enabling the air heat exchanger 401 to cool, that is, the air heat exchanger 401 cools the refrigerant flowing through it, ultimately achieving the cooling of the heat pump assembly 40, and thus enabling the terminal system to cool.

[0048] This application provides a control method for controlling a dual-source heat pump system in any of the above embodiments. The dual-source heat pump system includes a second valve 100 and a third power pump 120. Figure 3 As shown, the control method includes: Step 301: Obtain the first temperature value of the solar water heater and the second temperature value of the first water tank.

[0049] A first temperature sensor can be installed on the solar water heater 10, and a second temperature sensor can be installed on the first water tank 20. The first temperature sensor can detect the temperature value of the solar water heater 10, and the second temperature sensor can detect the temperature value of the second water tank 110. Thus, the first temperature value and the second temperature value can be obtained from the first temperature sensor and the second temperature sensor respectively.

[0050] Step 302: Based on the first temperature value and the second temperature value, control the first power pump, the second power pump, the third power pump, the first valve, and the second valve.

[0051] Once the first temperature value and the second temperature value are obtained, the first power pump 50, the second power pump 70, the third power pump 120, the first valve 60 and the second valve 100 can be controlled based on the first temperature value and the second temperature value, thereby enabling the dual-source heat pump system to switch between different modes and making the dual-source heat pump system more versatile.

[0052] In addition, in some embodiments, step 302 can be implemented as follows: when the first temperature value is less than a first set temperature threshold and the first temperature value is greater than or equal to the sum of the second temperature value and the second set temperature threshold, control the third power pump to start and run, control the first power pump and the second power pump to both shut down, and control the first valve and the second valve to both close; when the first temperature value is less than or equal to the sum of the second temperature value and the third set temperature threshold, or when the second temperature value is greater than a fourth set temperature threshold, control the third power pump to shut down; when the second temperature value is greater than or equal to a fifth set temperature threshold, control the second valve and the third power pump to shut down, and control the first power pump, the second power pump, and the first valve to all open; when the second temperature value is less than the fifth set temperature threshold, and When the second temperature value is greater than the sixth set temperature threshold, the first valve, the second valve, and the third power pump are all closed, and the first power pump and the second power pump are all turned on; when the second temperature value is less than the sixth set temperature threshold, the first valve and the second valve are all closed, and the first power pump and the third power pump are all turned off, while the second power pump is turned on; wherein the second set temperature threshold, the third set temperature threshold, and the fourth set temperature threshold are all less than the first set temperature threshold, the second set temperature threshold is greater than the third set temperature threshold, the second set temperature threshold and the third set temperature threshold are both less than the fourth set temperature threshold, the fifth set temperature threshold and the sixth set temperature threshold are both less than the fourth set temperature threshold, and the sixth set temperature threshold is less than the fifth set temperature threshold.

[0053] The first, second, third, fourth, fifth, and sixth set temperature thresholds can all be set according to actual needs. For example, the first set temperature threshold can be 90℃, the second set temperature threshold 5℃, the third set temperature threshold 2℃, the fourth set temperature threshold 75℃, the fifth set temperature threshold 35℃, and the sixth set temperature threshold 8℃. In this case, it is equivalent to the temperature of the solar water heater 10 being less than 90℃, and the temperature of the solar water heater 10 being greater than or equal to that of the first water tank 20. When the sum of the temperature and 5℃ is reached, the third power pump 120 is turned on and running, the first power pump 50 and the second power pump 70 are turned off, and the first valve 60 and the second valve 100 are turned off. This means that the third power pump 120 can pump the liquid in the first water tank 20 to the solar water heater 10, and the liquid in the solar water heater 10 can flow to the first water tank 20. This is equivalent to using solar energy to heat the liquid in the first water tank 20 directly. In this case, the dual-source heat pump system can be called the dual-source heat pump system in solar supplementary heating mode.

[0054] When the temperature of the solar water heater 10 is less than or equal to the sum of the temperature of the first water tank 20 and 2°C, or when the temperature of the first water tank 20 is greater than 75°C, the third power pump 120 is shut off, meaning the temperature in the first water tank 20 has met the requirements and no further heating is needed. In this situation, the dual-source heat pump system is referred to as being in solar-supplemented heating mode.

[0055] When the temperature of the first water tank 20 is greater than or equal to 35℃, the second valve 100 and the third power pump 120 are closed, while the first power pump 50, the second power pump 70, and the first valve 60 are all opened. This is equivalent to using the higher temperature liquid in the first water tank 20 to heat the liquid in the first heat exchange component 30. Thus, the liquid in the return water pipe of the terminal system flowing into the first heat exchange component 30 can be directly heated by the liquid in the first water tank 20, effectively using the temperature of the first water tank 20 to heat the heat pump component 40. This condition is referred to as the dual-source heat pump system being in water tank supplementary heating mode. When the dual-source heat pump system is in water tank supplementary heating mode, the heat pump component 40 can be in standby or off state.

[0056] When the temperature of the first water tank 20 is less than 35℃ and greater than 8℃, the first valve 60, the second valve 100, and the third power pump 120 are all closed, while the first power pump 50 and the second power pump 70 are both opened. This is equivalent to allowing the liquid in the first water tank 20 to flow into the first heat exchange component 30, and the first heat exchange component 30 exchanges heat through the heat of the liquid in the first water tank 20. This is equivalent to using the temperature of the first water tank 20 to heat the heat pump component 40. In this situation, the dual-source heat pump system is referred to as being in water source supplementary heating mode. When the dual-source heat pump system is in water tank supplementary heating mode, the heat pump component 40 can be put into operation.

[0057] When the temperature of the first water tank 20 is less than 8℃, both the first valve 60 and the second valve 100 are closed, and both the first power pump 50 and the third power pump 120 are closed, while the second power pump 70 is turned on. At this time, the heat pump assembly 40 is in the on-state, allowing the air heat exchanger 401 to extract heat from the air. The air heat exchanger 401 then transfers the heat to the condenser 404, which in turn transfers the heat to the second pipe 90, thus enabling the heat pump assembly 40 to generate heat—that is, utilizing the heat of the air to generate heat. This condition is referred to as the dual-source heat pump system being in air-source supplementary heating mode. In this mode, the heat pump assembly 40 is in the on-state.

[0058] Of course, in the embodiments of this application, the first set temperature threshold, the second set temperature threshold, the third set temperature threshold, the fourth set temperature threshold, the fifth set temperature threshold, and the sixth set temperature threshold can also be other values. For example, the first set temperature threshold is 85°C, the second set temperature threshold is any value between 5°C and 10°C, the third set temperature threshold is any value between 2°C and 4°C, the fourth set temperature threshold is 70°C, the fifth set temperature threshold is 36°C, and the sixth set temperature threshold is 7°C. The embodiments of this application do not limit this to any particular value.

[0059] In addition, in some implementations, the control method further includes: obtaining the time point of the dual-source heat pump system; and controlling the first power pump, the second power pump, the third power pump, the first valve, and the second valve based on the time point of the dual-source heat pump system.

[0060] The dual-source heat pump system can determine the current time using a timing device, which includes, but is not limited to, clocks, electronic watches, and electronic devices. Once the current time of the dual-source heat pump system is determined, the first power pump 50, the second power pump 70, the third power pump 120, the first valve 60, and the second valve 100 can be controlled accordingly, allowing the dual-source heat pump system to switch between different modes.

[0061] In addition, in some implementations, the control of the first power pump, the second power pump, the third power pump, the first valve, and the second valve based on the time point of the dual-source heat pump system can be implemented as follows: when the time point of the dual-source heat pump system is in a first set time period, control the first power pump, the second power pump, the first valve, and the second valve to all open, and control the third power pump to close; wherein, the first set time period is the time period during night.

[0062] In this system, when the dual-source heat pump system operates during nighttime hours, electricity costs are lower compared to other times. Therefore, the first power pump 50, the second power pump 70, the first valve 60, and the second valve 100 can all be opened, while the third power pump 120 is closed. The heat pump assembly 40 can be kept running, allowing the air heat exchanger 401 to continuously extract heat from the air. This heat is then transferred to the first water tank 20 to heat it, enabling it to store thermal energy. The heat extracted by the air heat exchanger 401 provides heat to the terminal system. This is equivalent to operating the heat pump assembly 40 during periods of lower electricity costs, thus saving economic costs. In other words, the dual-source heat pump system is essentially operating in off-peak electricity storage mode.

[0063] It should be noted that the first set time period can be from 3:00 AM to 7:00 AM. Of course, the first set time period can also be other time periods, such as from 1:00 AM to 6:00 AM; or, for example, from 1:00 AM to 5:00 AM. In this regard, the embodiments of this application do not limit it.

[0064] In addition, in this embodiment, when the dual-source heat pump system is in off-peak electricity storage mode, when the temperature of the first water tank 20 is less than the first preset temperature threshold, the operating status of the heat pump assembly 40 can be detected. If the heat pump assembly 40 is in the on-state, a shutdown command is executed. After the compressor 403 is shut down, the first valve 60 and the second valve 100 are opened, then the first power pump 50 and the second power pump 70 are turned on, and then the startup command is executed, causing the heat pump assembly 40 to start. If the heat pump assembly 40 is in the standby state, the first valve 60 and the second valve 100 are opened, then the first power pump 50 and the second power pump 70 are turned on, and then the startup command is executed. When the temperature of the first water tank 20 is greater than or equal to the first preset temperature threshold, the first power pump 50 is turned off, then the first valve 60 is turned off, then the second power pump 70 and the second valve 100 are turned off, and finally the heat pump assembly 40 is turned off.

[0065] It should be noted that the first preset temperature threshold can be set according to actual needs. For example, the first preset temperature threshold is 50°C, or for another example, it is 55°C. This application does not limit the specific temperature threshold in this regard.

[0066] Furthermore, in this embodiment, when the dual-source heat pump system is located during a second time period, which can be a peak electricity consumption period, such as 10:00-13:00 or 17:00-22:00 daily, the heat pump component 40 can be shut down to save energy. Conversely, when the temperature return of the heat pump component 40 is less than 25°C, the heat pump component 40 can be turned on, meaning it is in operation. Operation of the heat pump component 40 refers to the heat pump component 40 being turned on and the compressor 403 running.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A dual-source heat pump system, characterized in that, The dual-source heat pump system includes: a solar water heater, a first water tank, a first heat exchange component, and a heat pump component; The solar water heater is connected to the first water tank, the first heat exchange component is connected to the first water tank through a first power pump, the first heat exchange component is connected to a first valve, one end of the first valve is connected to a second power pump, the second power pump is connected to a first pipe, and the first pipe is used to connect to the return water pipe of the terminal system. The heat pump assembly is connected to a second pipe, which is used to connect to the water supply pipe of the terminal system. The heat pump assembly includes an air heat exchanger, a second heat exchange component, a compressor, and a condenser. The first water tank is connected to the second heat exchange component, the first heat exchange component is connected to the second heat exchange component, the second heat exchange component and the air heat exchanger are both connected to the compressor, the compressor is connected to the condenser, and the condenser is connected to both the compressor and the air heat exchanger. One end of the second pipe is connected to the condenser.

2. The dual-source heat pump system according to claim 1, characterized in that, The dual-source heat pump system also includes a second valve; One end of the second valve is connected to the first pipe, and the other end of the second valve is connected to the second pipe.

3. The dual-source heat pump system according to claim 1, characterized in that, The dual-source heat pump system also includes a second water tank; One end of the second power pump is connected to the second water tank, and the second water tank is connected to the first pipe.

4. The dual-source heat pump system according to claim 1, characterized in that, The first valve is a three-way valve. The first end of the first valve is connected to the second power pump, the second end of the first valve is connected to the first heat exchange component, and the third end of the first valve is connected to the condenser.

5. The dual-source heat pump system according to claim 1, characterized in that, The dual-source heat pump system also includes a third power pump; One end of the third power pump is connected to the first water tank, and the other end of the third power pump is connected to the solar water heater.

6. The dual-source heat pump system according to any one of claims 1-5, characterized in that, The dual-source heat pump system also includes a cooling tower fan; The cooling tower fan is connected to the second heat exchange component, and the cooling tower fan is used to transfer cold liquid to the second heat exchange component so that the heat pump component can cool.

7. A control method, characterized in that, For controlling a dual-source heat pump system according to any one of claims 1-6, the dual-source heat pump system comprising a second valve and a third power pump, the control method comprising: Obtain the first temperature value of the solar water heater and the second temperature value of the first water tank; Based on the first temperature value and the second temperature value, the first power pump, the second power pump, the third power pump, the first valve, and the second valve are controlled.

8. The control method according to claim 7, characterized in that, The control of the first power pump, the second power pump, the third power pump, the first valve, and the second valve based on the first temperature value and the second temperature value includes: When the first temperature value is less than the first set temperature threshold and the first temperature value is greater than or equal to the sum of the second temperature value and the second set temperature threshold, the third power pump is controlled to start and run, the first power pump and the second power pump are both controlled to shut down, and the first valve and the second valve are both controlled to shut down. If the first temperature value is less than or equal to the sum of the second temperature value and the third set temperature threshold, or if the second temperature value is greater than the fourth set temperature threshold, the third power pump is controlled to shut down. When the second temperature value is greater than or equal to the fifth set temperature threshold, the second valve and the third power pump are controlled to close, and the first power pump, the second power pump, and the first valve are all controlled to open. When the second temperature value is less than the fifth set temperature threshold and the second temperature value is greater than the sixth set temperature threshold, the first valve, the second valve, and the third power pump are all closed, and the first power pump and the second power pump are all turned on. When the second temperature value is less than the sixth set temperature threshold, both the first valve and the second valve are closed, and both the first power pump and the third power pump are closed, while the second power pump is turned on; wherein the second set temperature threshold, the third set temperature threshold, and the fourth set temperature threshold are all less than the first set temperature threshold, the second set temperature threshold is greater than the third set temperature threshold, the second set temperature threshold and the third set temperature threshold are both less than the fourth set temperature threshold, the fifth set temperature threshold and the sixth set temperature threshold are both less than the fourth set temperature threshold, and the sixth set temperature threshold is less than the fifth set temperature threshold.

9. The control method according to claim 7, characterized in that, The control method further includes: Obtain the current time point of the dual-source heat pump system; Based on the current time point of the dual-source heat pump system, the first power pump, the second power pump, the third power pump, the first valve, and the second valve are controlled.

10. The control method according to claim 9, characterized in that, The control of the first power pump, the second power pump, the third power pump, the first valve, and the second valve based on the current time point of the dual-source heat pump system includes: When the dual-source heat pump system is in a first set time period, the first power pump, the second power pump, the first valve, and the second valve are all opened, and the third power pump is closed; wherein, the first set time period is a time period during night.

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