Double-system waste heat recovery heat pump system based on shared fins and working method

Abstract

The application discloses a double-system waste heat recovery heat pump system based on shared fins, which comprises an air conditioner heat pump system and a domestic hot water system. The air conditioner heat pump system comprises a first compressor, a four-way valve, an indoor heat exchanger, a first expansion valve and an outdoor heat exchanger. The domestic hot water system comprises a second compressor, a domestic hot water tank and a second expansion valve. The outdoor heat exchanger is internally provided with shared heat dissipation fins, air conditioner system fluorine pipes and domestic hot water fluorine pipes which are in heat exchange with the shared heat dissipation fins. The vertical sections of the air conditioner system fluorine pipes and the domestic hot water fluorine pipes in the shared heat dissipation fins are in a wavy shape, and the air conditioner system fluorine pipes and the domestic hot water fluorine pipes are arranged in a cross shape. The application has the advantages of realizing heat exchange cooperation of the air conditioner heat pump system and the domestic hot water system, recycling waste heat of the air conditioner heat pump system, improving energy utilization efficiency, simplifying the structure and reducing the cost.

Description

Technical Field

[0001] This invention relates to the field of heat pump and waste heat recovery technology, and in particular to a dual-system waste heat recovery heat pump system based on shared fins and its operating method. Background Technology

[0002] With the increasing prominence of energy resource issues, waste heat recovery technology has become an important means to improve energy utilization efficiency and achieve energy conservation and emission reduction. Heat pump systems, as highly efficient energy transfer devices, are widely used in air conditioning and heating, domestic hot water supply, and other fields.

[0003] Currently, in existing technologies, air conditioning heat pump systems and domestic hot water systems are usually set up independently, each equipped with independent heat dissipation and heat exchange components. This not only occupies a large space and has high equipment costs, but also fails to effectively recover and utilize the waste heat generated during the operation of the air conditioning heat pump system, resulting in energy waste. Moreover, for some integrated air conditioning and domestic hot water systems, there are problems with unsatisfactory waste heat recovery and unstable operation. In particular, when the refrigerant-based air conditioning heat pump is connected to the domestic hot water system, mutual interference is likely to occur. For example, in a tri-generation system, when the air conditioner is cooling, the indoor unit evaporator, outdoor unit condenser, and domestic hot water system load are mutually dependent, restrictive, and interfering, making it impossible to operate stably. When the air conditioner is heating, the domestic hot water also needs to be heated. Changes in the load conditions of both can easily cause fluctuations in water temperature, making the system unstable and resulting in unsatisfactory user experience and energy-saving effects. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-system waste heat recovery heat pump system and its working method based on shared fins. It has the advantages of realizing the heat exchange synergy between the air conditioning heat pump system and the domestic hot water system, recovering waste heat from the air conditioning heat pump system, improving energy utilization efficiency, and simplifying the structure and reducing costs.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A dual-system waste heat recovery heat pump system based on shared fins, including an air conditioning heat pump system and a domestic hot water system; The air conditioning heat pump system includes a first compressor, a four-way valve, an indoor heat exchanger, a first expansion valve, and an outdoor heat exchanger. The domestic hot water system includes a second compressor, a domestic hot water tank, and a second expansion valve; The outdoor heat exchanger is equipped with common heat dissipation fins and air conditioning system refrigerant pipes and domestic hot water refrigerant pipes that exchange heat with the common heat dissipation fins. The vertical cross-section of the air conditioning system refrigerant pipes and domestic hot water refrigerant pipes in the common heat dissipation fins is wavy, and the air conditioning system refrigerant pipes and domestic hot water refrigerant pipes are arranged in a cross pattern. The outlet of the first compressor is connected to the first port of the four-way valve, the second port of the four-way valve is connected to the first port of the indoor heat exchanger, the second port of the indoor heat exchanger is connected to the first port of the first expansion valve, the second port of the first expansion valve is connected to the first port of the refrigerant pipe of the air conditioning system, the second port of the refrigerant pipe of the air conditioning system is connected to the fourth port of the four-way valve, and the third port of the four-way valve is connected to the inlet of the first compressor. The outlet of the second compressor in the domestic hot water system is connected to the inlet of the domestic hot water tank. The outlet of the domestic hot water tank is connected to the second expansion valve. The outlet of the second expansion valve is connected to the inlet of the domestic hot water refrigerant pipe. The outlet of the domestic hot water refrigerant pipe is connected to the inlet of the second compressor.

[0006] The operating modes of the dual-system waste heat recovery heat pump system based on shared fins include air conditioning summer mode and domestic hot water waste heat recovery mode, air conditioning summer mode, air conditioning winter mode and domestic hot water mode, air conditioning winter mode, and domestic hot water mode. In both the summer mode and the domestic hot water waste heat recovery mode of the air conditioner, the first compressor of the air conditioning heat pump system operates, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant enters through the first port of the four-way valve and then enters the air conditioning system's refrigerant pipe on the outdoor side heat exchanger through the fourth port of the four-way valve. The high-temperature, high-pressure gaseous refrigerant exchanges heat with the shared heat dissipation fins, transferring the condensation waste heat to the domestic hot water refrigerant pipe, becoming a medium-temperature, high-pressure liquid refrigerant. It then passes through the first expansion valve for throttling, becoming a low-temperature, low-pressure liquid refrigerant, which then enters the indoor side heat exchanger. After heat exchange, it becomes a medium-temperature, low-pressure gaseous refrigerant. The low-temperature, low-pressure gaseous refrigerant then passes through the fourth port of the four-way valve... The refrigerant enters through the second port, passes through the third port of the four-way valve, and then enters the first compressor for cyclic operation. The second compressor of the domestic hot water system operates, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant enters the heating coil of the domestic hot water tank, where it exchanges heat and becomes a medium-temperature, high-pressure liquid refrigerant. It then enters the second expansion valve for throttling and becomes a low-temperature, low-pressure gaseous refrigerant. Subsequently, it passes through the domestic hot water refrigerant pipe of the outdoor heat exchanger, where the low-temperature, low-pressure liquid refrigerant exchanges heat with the shared heat dissipation fins, absorbing the waste heat from the air conditioner condensation, and becomes a medium-temperature, low-pressure gaseous refrigerant. Finally, it enters the second compressor of the domestic hot water system for cyclic operation. In summer mode, the air conditioner's heat pump system operates with the first compressor working, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant enters through the first port of the four-way valve and then through the fourth port to the refrigerant pipe of the outdoor heat exchanger. The high-temperature, high-pressure gaseous refrigerant exchanges heat with the shared heat sink fins, becoming a medium-temperature, high-pressure liquid refrigerant. It then passes through the first expansion valve, becoming a low-temperature, low-pressure liquid refrigerant, which then enters the indoor heat exchanger. After heat exchange, it becomes a medium-temperature, low-pressure gaseous refrigerant. This low-temperature, low-pressure gaseous refrigerant enters through the second port of the four-way valve and then through the third port to the first compressor, where it cycles continuously. The domestic hot water system is not operating. In both winter and domestic hot water modes, the air conditioner's heat pump system's first compressor operates, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant enters through the first port of the four-way valve and then through the second port to the indoor heat exchanger. After heat exchange, it becomes a medium-temperature, high-pressure liquid refrigerant. Subsequently, it passes through the first expansion valve for throttling, becoming a low-temperature, low-pressure liquid refrigerant. This liquid refrigerant then enters the refrigerant pipes of the outdoor heat exchanger. The low-temperature, low-pressure gaseous refrigerant exchanges heat with the shared heat sink fins and the surrounding air, bringing the refrigerant closer to ambient temperature, becoming a medium-temperature, low-pressure gaseous refrigerant. This medium-temperature, low-pressure gaseous refrigerant then enters through the fourth port of the four-way valve. The refrigerant passes through the third port of the four-way valve and enters the first compressor for cyclic operation. The second compressor of the domestic hot water system operates, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant enters the heating coil of the domestic hot water tank, where it exchanges heat and becomes a medium-temperature, high-pressure liquid refrigerant. Then, it enters the second expansion valve for throttling and becomes a low-temperature, low-pressure gaseous refrigerant. Subsequently, it passes through the domestic hot water refrigerant pipe of the outdoor heat exchanger, where the low-temperature, low-pressure liquid refrigerant exchanges heat with the shared heat dissipation fins and the air environment. The refrigerant approaches the ambient temperature and becomes a medium-temperature, low-pressure gaseous refrigerant, which then enters the second compressor of the domestic hot water system for cyclic operation. In winter mode, the air conditioner's heat pump system operates with the first compressor working, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant enters through the first port of the four-way valve, then through the second port to the indoor heat exchanger. After heat exchange, it becomes a medium-temperature, high-pressure liquid refrigerant. Subsequently, it passes through the first expansion valve for throttling, becoming a low-temperature, low-pressure liquid refrigerant. This liquid refrigerant then enters the refrigerant pipes of the air conditioning system in the outdoor heat exchanger. The low-temperature, low-pressure gaseous refrigerant exchanges heat with the shared heat sink fins and the surrounding air, becoming a medium-temperature, low-pressure gaseous refrigerant. This medium-temperature, low-pressure gaseous refrigerant enters through the fourth port of the four-way valve, then through the third port, and finally enters the first compressor for cyclic operation. The domestic hot water system is not operating. In domestic hot water mode, the second compressor of the domestic hot water system operates, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant enters the heating coil of the domestic hot water tank, where it exchanges heat and becomes a medium-temperature, high-pressure liquid refrigerant. It then enters the second expansion valve for throttling, becoming a low-temperature, low-pressure gaseous refrigerant. Subsequently, it passes through the domestic hot water refrigerant pipes of the outdoor heat exchanger, where it exchanges heat with the shared heat sink fins and the surrounding air. The refrigerant approaches ambient temperature, becoming a medium-temperature, low-pressure gaseous refrigerant, which then enters the second compressor of the domestic hot water system for recirculation. The air conditioning heat pump system does not operate.

[0007] In summary, the present invention has the following beneficial effects: 1. Highly efficient waste heat recovery and improved energy utilization: In summer cooling mode, the waste heat released by the outdoor heat exchanger of the air conditioner is transferred through shared heat dissipation fins. The second compressor only needs to operate the delivery function to deliver the refrigerant to the indoor heat exchanger of the domestic hot water system, thus realizing waste heat recovery. The second compressor does not need to consume additional energy to assist in the preparation of domestic hot water, thereby improving the thermal efficiency of the domestic hot water system, reducing energy waste, and conforming to the industry development trend of energy conservation and consumption reduction. At the same time, it solves the pain point of low-temperature condensation heat waste in existing water heat pumps and achieves efficient utilization of low-grade waste heat. 2. The dual systems operate independently, resolving mutual interference issues. The air conditioning heat pump system and the domestic hot water system use completely independent pipelines, achieving heat transfer only through shared heat dissipation fins, with no direct connection. Load fluctuations in the domestic hot water system will not affect the air conditioning performance, and the preparation of domestic hot water in winter will not interfere with indoor heating. This completely solves the core pain points of instability and mutual interference between pipelines connected to the water tank in traditional tri-generation systems. At the same time, it avoids the energy consumption problem of traditional tri-generation systems being "overpowered," improving system operational stability and energy efficiency. 3. The structure is simple, the modification is convenient, and the cost is controllable. There is no need to carry out large-scale modification of the existing water-cooled heat pump system. Only an independent pipeline needs to be added to the outdoor heat exchanger, which shares the heat dissipation fins of the original outdoor heat exchanger. The modification is simple and the cost is controllable. At the same time, the two systems are designed independently, and the later maintenance only needs to be carried out for each system, which is convenient and reduces the later operating costs. 4. Stable and reliable operation with strong adaptability: The two systems operate independently. If one system fails, the other system can continue to operate normally without affecting the user's basic needs. The fault self-diagnosis module can detect and report faults in a timely manner and activate backup protection to further improve system reliability. It is suitable for various scenarios such as residential, office, and health care facilities that require simultaneous air conditioning control and domestic hot water preparation, and has a wide range of applications. 5. High heat exchange efficiency and excellent user experience: The pipes of the outdoor heat exchanger of the air conditioner and the domestic hot water system are alternately coiled on the fins, and the surface is coated with a heat exchange enhancement coating, resulting in high heat transfer efficiency. The waste heat recovery efficiency in summer is no less than 80%. The domestic hot water tank can automatically adjust its operating status according to the water temperature, adapt to load fluctuations, and ensure a stable supply of domestic hot water. The air conditioning heat pump system operates without interference, and the indoor temperature control accuracy is high, improving the user experience. 6. It avoids the defects of existing technologies and has outstanding innovation. It is different from the traditional "single system integration" approach. It adopts the design of "dual system independent and shared heat transfer fins". It avoids the problems of complex structure and poor stability of the tri-generation system, and solves the drawbacks of mutual interference in the pipeline connection to the water tank scheme. At the same time, it overcomes the defect of existing low temperature waste heat recovery technology that is difficult to adapt to the needs of air conditioning and domestic hot water. The technological innovation is outstanding. 7. A dual-system waste heat recovery heat pump system with shared heat dissipation fins can decouple the heat pump load. When the air conditioning heat pump system is cooling, the outdoor heat exchanger of the air conditioning heat pump system and the domestic hot water system share the same heat dissipation fins, and the recovered heat is used for heating in the domestic hot water system. When the air conditioning heat pump system is heating, the outdoor heat exchanger of the air conditioning heat pump system and the domestic hot water system share the same heat dissipation fins. The piping of the outdoor heat exchanger of the air conditioning heat pump system and the domestic hot water system is independent and not shared, thus decoupling the load. The system regulates the heat absorption of the outdoor heat exchanger by adjusting the fan speed and compressor speed of the outdoor heat exchanger, making the system operation more stable. Attached Figure Description

[0008] Figure 1 This is a system structure diagram of an embodiment; Figure 2 This is a flowchart illustrating the workflow of the air conditioning summer mode and the domestic hot water waste heat recovery mode in the embodiment. Figure 3 This is a flowchart illustrating the workflow of the air conditioning winter mode and the domestic hot water waste heat recovery mode in the embodiment. Figure 4 This is a flowchart illustrating the workflow of the air conditioner's summer mode in an embodiment. Figure 5 This is a flowchart illustrating the workflow of the air conditioner's winter mode in an embodiment. Figure 6 This is a flowchart illustrating the workflow of the domestic hot water mode in an embodiment. Figure 7 This is a schematic diagram of the cross-arrangement structure of the air conditioning system refrigerant pipes and the domestic hot water refrigerant pipes in an embodiment.

[0009] In the diagram, 1. Air conditioning heat pump system; 2. Domestic hot water system; 3. First compressor; 4. Four-way valve; 5. Indoor heat exchanger; 6. First expansion valve; 7. Outdoor heat exchanger; 8. Second compressor; 9. Domestic hot water tank; 10. Second expansion valve; 11. Shared heat dissipation fins; 12. Air conditioning system refrigerant pipe; 13. Domestic hot water refrigerant pipe. Detailed Implementation

[0010] The present invention will be further described in detail below with reference to the accompanying drawings.

[0011] Dual-system waste heat recovery heat pump system based on shared heat dissipation fins, such as Figures 1-7 The system shown includes an air conditioning heat pump system 1 and a domestic hot water system 2. The air conditioning heat pump system 1 includes a first compressor 3, a four-way valve 4, an indoor heat exchanger 5, a first expansion valve 6, and an outdoor heat exchanger 7. The domestic hot water system 2 includes a second compressor 8, a domestic hot water tank 9, and a second expansion valve 10; The outdoor heat exchanger 7 is equipped with a common heat dissipation fin 11 and air conditioning system refrigerant pipes 12 and domestic hot water refrigerant pipes 13 that exchange heat with the common heat dissipation fins 11. The vertical cross-sections of the air conditioning system refrigerant pipes 12 and domestic hot water refrigerant pipes 13 in the common heat dissipation fins 11 are both wavy, and the air conditioning system refrigerant pipes 12 and domestic hot water refrigerant pipes 13 are arranged in a cross pattern. The cross arrangement of the air conditioning system refrigerant pipes 12 and domestic hot water refrigerant pipes 13 can ensure that the temperatures of the two pipes are similar after heat exchange.

[0012] The outlet end of the first compressor 3 is connected to the first port of the four-way valve 4, the second port of the four-way valve 4 is connected to the first port of the indoor heat exchanger 5, the second port of the indoor heat exchanger 5 is connected to the first port of the first expansion valve 6, the second port of the first expansion valve 6 is connected to the first port of the air conditioning system refrigerant pipe 12, the second port of the air conditioning system refrigerant pipe 12 is connected to the fourth port of the four-way valve 4, and the third port of the four-way valve 4 is connected to the inlet end of the first compressor 3. The outlet end of the second compressor 8 of the domestic hot water system 2 is connected to the inlet end of the domestic hot water tank 9. The outlet end of the domestic hot water tank 9 is connected to the second expansion valve 10. The outlet end of the second expansion valve 10 is connected to the inlet end of the domestic hot water refrigerant pipe 13. The outlet end of the domestic hot water refrigerant pipe 13 is connected to the inlet end of the second compressor 8.

[0013] Specific implementation process: The operating modes of the dual-system waste heat recovery heat pump system based on shared fins include air conditioning summer mode and domestic hot water waste heat recovery mode, air conditioning summer mode, air conditioning winter mode and domestic hot water mode, air conditioning winter mode, and domestic hot water mode. In the summer mode and the domestic hot water waste heat recovery mode of the air conditioner, the first compressor 3 of the air conditioner heat pump system 1 operates, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant enters from the first port of the four-way valve 4 and then enters the air conditioning system refrigerant pipe 12 of the outdoor heat exchanger 7 from the fourth port of the four-way valve 4. The high-temperature, high-pressure gaseous refrigerant exchanges heat with the common heat dissipation fins 11 and transfers the condensation waste heat to the domestic hot water refrigerant pipe 13, becoming a medium-temperature, high-pressure liquid refrigerant. Subsequently, it passes through the first expansion valve 6 for throttling, becoming a low-temperature, low-pressure liquid refrigerant, and then enters the indoor heat exchanger 5. After heat exchange, it becomes a medium-temperature, low-pressure gaseous refrigerant. The low-temperature, low-pressure gaseous refrigerant passes through the fourth port of the four-way valve 4... The refrigerant enters through the second port, passes through the third port of the four-way valve 4, and enters the first compressor 3 for cyclic operation. The second compressor 8 of the domestic hot water system 2 operates, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant enters the heating coil of the domestic hot water tank 9, where it undergoes heat exchange and becomes a medium-temperature, high-pressure liquid refrigerant. Subsequently, it enters the second expansion valve 10 for throttling and becomes a low-temperature, low-pressure gaseous refrigerant. Then, it passes through the domestic hot water refrigerant pipe 13 of the outdoor heat exchanger 7, where the low-temperature, low-pressure liquid refrigerant exchanges heat with the common heat dissipation fins 11, absorbing the waste heat from the air conditioning condensation and becoming a medium-temperature, low-pressure gaseous refrigerant. Subsequently, it enters the second compressor 8 of the domestic hot water system 2 for cyclic operation. In summer mode, the first compressor 3 of the air conditioning heat pump system 1 operates, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant enters through the first port of the four-way valve 4 and then through the fourth port of the four-way valve 4 into the refrigerant pipe 12 of the outdoor heat exchanger 7. The high-temperature, high-pressure gaseous refrigerant exchanges heat with the common heat dissipation fins 11, becoming a medium-temperature, high-pressure liquid refrigerant. Subsequently, it passes through the first expansion valve 6 for throttling, becoming a low-temperature, low-pressure liquid refrigerant. It then enters the indoor heat exchanger 5, where it exchanges heat again to become a medium-temperature, low-pressure gaseous refrigerant. The low-temperature, low-pressure gaseous refrigerant enters through the second port of the four-way valve 4 and then through the third port of the four-way valve 4, entering the first compressor 3 for cyclic operation. The domestic hot water system 2 does not operate. In both winter and domestic hot water modes of the air conditioner, the first compressor 3 of the air conditioning heat pump system 1 operates, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant enters through the first port of the four-way valve 4, then through the second port to the indoor heat exchanger 5. After heat exchange, it becomes a medium-temperature, high-pressure liquid refrigerant. Subsequently, it passes through the first expansion valve 6, becoming a low-temperature, low-pressure liquid refrigerant, which then enters the refrigerant pipe 12 of the outdoor heat exchanger 7. This low-temperature, low-pressure gaseous refrigerant exchanges heat with the shared heat dissipation fins 11 and the surrounding air, bringing the refrigerant closer to ambient temperature, becoming a medium-temperature, low-pressure gaseous refrigerant. This medium-temperature, low-pressure gaseous refrigerant then enters through the fourth port of the four-way valve 4... The refrigerant enters the first compressor 3 through the third port of the four-way valve 4 and circulates. The second compressor 8 of the domestic hot water system 2 operates, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant enters the heating coil of the domestic hot water tank 9 and exchanges heat in the domestic hot water tank 9, becoming a medium-temperature, high-pressure liquid refrigerant. Then, it enters the second expansion valve 10 for throttling, becoming a low-temperature, low-pressure gaseous refrigerant. Subsequently, it passes through the domestic hot water refrigerant pipe 13 of the outdoor heat exchanger 7, where the low-temperature, low-pressure liquid refrigerant exchanges heat with the shared heat dissipation fins 11 and the air environment. The refrigerant approaches the ambient temperature and becomes a medium-temperature, low-pressure gaseous refrigerant. Then, it enters the second compressor 8 of the domestic hot water system 2 and circulates. In winter mode, the first compressor 3 of the air conditioning heat pump system 1 operates, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant enters through the first port of the four-way valve 4, and then through the second port of the four-way valve 4 into the indoor heat exchanger 5. After heat exchange, it becomes a medium-temperature, high-pressure liquid refrigerant. Subsequently, it passes through the first expansion valve 6 for throttling, becoming a low-temperature, low-pressure liquid refrigerant. Then, it enters the refrigerant pipe 12 of the air conditioning system in the outdoor heat exchanger 7. The low-temperature, low-pressure gaseous refrigerant exchanges heat with the shared heat dissipation fins 11 and the air environment, becoming a medium-temperature, low-pressure gaseous refrigerant. The medium-temperature, low-pressure gaseous refrigerant enters through the fourth port of the four-way valve 4, and then through the third port of the four-way valve 4, and enters the first compressor 3 for cyclic operation. The domestic hot water system 2 does not operate. In domestic hot water mode, the second compressor 8 of the domestic hot water system 2 operates, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant enters the heating coil of the domestic hot water tank 9, where it undergoes heat exchange, becoming a medium-temperature, high-pressure liquid refrigerant. Subsequently, it enters the second expansion valve 10 for throttling, becoming a low-temperature, low-pressure gaseous refrigerant. Then, it passes through the domestic hot water refrigerant pipe 13 of the outdoor heat exchanger 7, where the low-temperature, low-pressure liquid refrigerant exchanges heat with the shared heat dissipation fins 11 and the ambient air. The refrigerant approaches the ambient temperature, becoming a medium-temperature, low-pressure gaseous refrigerant, and then enters the second compressor 8 of the domestic hot water system 2 for cyclic operation. The air conditioning heat pump system 1 does not operate.

[0014] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A dual-system waste heat recovery heat pump system based on shared heat dissipation fins, characterized in that: Including air conditioning heat pump system (1) and domestic hot water system (2); The air conditioning heat pump system (1) includes a first compressor (3), a four-way valve (4), an indoor heat exchanger (5), a first expansion valve (6), and an outdoor heat exchanger (7). The domestic hot water system (2) includes a second compressor (8), a domestic hot water tank (9), and a second expansion valve (10). The outdoor heat exchanger (7) is provided with a common heat dissipation fin (11) and air conditioning system refrigerant pipe (12) and domestic hot water refrigerant pipe (13) that exchange heat with the common heat dissipation fin (11). The vertical cross-section of the air conditioning system refrigerant pipe (12) and domestic hot water refrigerant pipe (13) in the common heat dissipation fin (11) is wavy, and the air conditioning system refrigerant pipe (12) and domestic hot water refrigerant pipe (13) are arranged in a cross pattern. The outlet end of the first compressor (3) is connected to the first port of the four-way valve (4), the second port of the four-way valve (4) is connected to the first port of the indoor heat exchanger (5), the second port of the indoor heat exchanger (5) is connected to the first port of the first expansion valve (6), the second port of the first expansion valve (6) is connected to the first port of the air conditioning system refrigerant pipe (12), the second port of the air conditioning system refrigerant pipe (12) is connected to the fourth port of the four-way valve (4), and the third port of the four-way valve (4) is connected to the inlet end of the first compressor (3). The outlet end of the second compressor (8) of the domestic hot water system (2) is connected to the inlet end of the domestic hot water tank (9). The outlet end of the domestic hot water tank (9) is connected to the second expansion valve (10). The outlet end of the second expansion valve (10) is connected to the inlet end of the domestic hot water refrigerant pipe (13). The outlet end of the domestic hot water refrigerant pipe (13) is connected to the inlet end of the second compressor (8).

2. The operating mode of a dual-system waste heat recovery heat pump system based on shared fins, used in the dual-system waste heat recovery heat pump system based on shared fins as described in claim 1, characterized in that: This includes air conditioner summer mode and domestic hot water waste heat recovery mode, air conditioner summer mode, air conditioner winter mode and domestic hot water mode, air conditioner winter mode, and domestic hot water mode; In the summer mode of air conditioning and the waste heat recovery mode of domestic hot water, the first compressor (3) of the air conditioning heat pump system (1) works, compressing the medium-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure gaseous refrigerant. The high-temperature high-pressure gaseous refrigerant enters from the first port of the four-way valve (4) and enters the air conditioning system refrigerant pipe (12) of the outdoor heat exchanger (7) from the fourth port of the four-way valve (4). The high-temperature high-pressure gaseous refrigerant exchanges heat with the common heat dissipation fins (11) and transfers the condensation waste heat to the domestic hot water refrigerant pipe (13), becoming a medium-temperature high-pressure liquid refrigerant. Then, it passes through the first expansion valve (6) for throttling and becomes a low-temperature low-pressure liquid refrigerant. Then, it enters the indoor heat exchanger (5) and, after heat exchange, becomes a medium-temperature low-pressure gaseous refrigerant. The low-temperature low-pressure gaseous refrigerant passes through the second port of the four-way valve (4). The refrigerant enters through the port, passes through the third port of the four-way valve (4), and enters the first compressor (3) for cyclic operation; the second compressor (8) of the domestic hot water system (2) operates, compressing the medium-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure gaseous refrigerant. The high-temperature high-pressure gaseous refrigerant enters the heating coil of the domestic hot water tank (9), where it undergoes heat exchange and becomes a medium-temperature high-pressure liquid refrigerant. Subsequently, it enters the second expansion valve (10) for throttling and becomes a low-temperature low-pressure gaseous refrigerant. Then, it passes through the domestic hot water refrigerant pipe (13) of the outdoor heat exchanger (7), where the low-temperature low-pressure liquid refrigerant exchanges heat with the common heat dissipation fins (11), absorbing the waste heat from the air conditioning condensation and becoming a medium-temperature low-pressure gaseous refrigerant. Subsequently, it enters the second compressor (8) of the domestic hot water system (2) for cyclic operation. In the summer mode of the air conditioner, the first compressor (3) of the air conditioner heat pump system (1) works, compressing the medium-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure gaseous refrigerant. The high-temperature high-pressure gaseous refrigerant enters from the first port of the four-way valve (4) and enters the air conditioning system refrigerant pipe (12) of the outdoor heat exchanger (7) from the fourth port of the four-way valve (4). The high-temperature high-pressure gaseous refrigerant exchanges heat with the common heat dissipation fins (11) and becomes a medium-temperature high-pressure liquid refrigerant. Then, it passes through the first expansion valve (6) for throttling and becomes a low-temperature low-pressure liquid refrigerant. Then, it enters the indoor heat exchanger (5) and becomes a medium-temperature low-pressure gaseous refrigerant after heat exchange. The low-temperature low-pressure gaseous refrigerant enters through the second port of the four-way valve (4) and enters the first compressor (3) through the third port of the four-way valve (4) for cyclic operation. The domestic hot water system (2) does not work. In the winter mode and domestic hot water mode of the air conditioner, the first compressor (3) of the air conditioner heat pump system (1) works, compressing the medium-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure gaseous refrigerant. The high-temperature high-pressure gaseous refrigerant enters from the first port of the four-way valve (4) and enters the indoor heat exchanger (5) from the second port of the four-way valve (4). After heat exchange, it becomes a medium-temperature high-pressure liquid refrigerant. Then, it passes through the first expansion valve (6) for throttling and becomes a low-temperature low-pressure liquid refrigerant. Then, it enters the air conditioning system refrigerant pipe (12) of the outdoor heat exchanger (7). The low-temperature low-pressure gaseous refrigerant exchanges heat with the common heat dissipation fins (11) and the air environment. The refrigerant approaches the ambient temperature and becomes a medium-temperature low-pressure gaseous refrigerant. The medium-temperature low-pressure gaseous refrigerant enters through the fourth port of the four-way valve (4) and passes through the fourth port of the four-way valve (4). The third port of the through valve (4) enters the first compressor (3) for cyclic operation; the second compressor (8) of the domestic hot water system (2) operates, compressing the medium-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure gaseous refrigerant. The high-temperature high-pressure gaseous refrigerant enters the heating coil of the domestic hot water tank (9), where it undergoes heat exchange and becomes a medium-temperature high-pressure liquid refrigerant. Subsequently, it enters the second expansion valve (10) for throttling and becomes a low-temperature low-pressure gaseous refrigerant. Then, it passes through the domestic hot water refrigerant pipe (13) of the outdoor heat exchanger (7), where the low-temperature low-pressure liquid refrigerant exchanges heat with the shared heat dissipation fins (11) and the air environment. The refrigerant approaches the ambient temperature and becomes a medium-temperature low-pressure gaseous refrigerant. Subsequently, it enters the second compressor (8) of the domestic hot water system (2) for cyclic operation. In the winter mode of the air conditioner, the first compressor (3) of the air conditioner heat pump system (1) works, compressing the medium-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure gaseous refrigerant. The high-temperature high-pressure gaseous refrigerant enters from the first port of the four-way valve (4) and enters the indoor heat exchanger (5) from the second port of the four-way valve (4). After heat exchange, it becomes a medium-temperature high-pressure liquid refrigerant. Then, it passes through the first expansion valve (6) for throttling and becomes a low-temperature low-pressure liquid refrigerant. Then, it enters the air conditioning system refrigerant pipe (12) of the outdoor heat exchanger (7). The low-temperature low-pressure gaseous refrigerant exchanges heat with the shared heat dissipation fins (11) and the air environment and becomes a medium-temperature low-pressure gaseous refrigerant. The medium-temperature low-pressure gaseous refrigerant enters through the fourth port of the four-way valve (4) and enters the first compressor (3) through the third port of the four-way valve (4) for cyclic operation. The domestic hot water system (2) does not work. In the domestic hot water mode, the second compressor (8) of the domestic hot water system (2) works, compressing the medium-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant enters the heating coil of the domestic hot water tank (9), where it exchanges heat and becomes a medium-temperature, high-pressure liquid refrigerant. Then, it enters the second expansion valve (10) for throttling and becomes a low-temperature, low-pressure gaseous refrigerant. Subsequently, it passes through the domestic hot water refrigerant pipe (13) of the outdoor heat exchanger (7), where the low-temperature, low-pressure liquid refrigerant exchanges heat with the shared heat dissipation fins (11) and the air environment. The refrigerant approaches the ambient temperature and becomes a medium-temperature, low-pressure gaseous refrigerant. Then, it enters the second compressor (8) of the domestic hot water system (2) for cyclic operation. The air conditioning heat pump system (1) does not work.

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