Multi-source heat pump system linked with central heating and used for reinforcing heating effect

Abstract

The invention discloses a multi-source heat pump system linked with central heating and used for reinforcing the heating effect, relates to the technical field of central heating and heat pumps, and solves the problems that an existing central heating tail end is large in temperature fluctuation, a user cannot autonomously regulate and control, and energy is wasted due to the fact that a traditional heat pump and a central heating pipe network are lack of coordination. The system comprises a central heating interface, a double-source heat pump unit and a dynamic intelligent control module, the double-source heat pump unit comprises a compressor, a multi-way reversing valve, a user heat exchanger, a primary (air source) heat exchange loop and a secondary (central heating source) heat exchange loop, and the dynamic intelligent control module is linked with the temperature sensor group to control loop opening and closing and mode switching. Accurate temperature control and autonomous regulation and control are achieved, the heating cost is reduced, the cooling and heating integrated function is achieved, energy utilization is optimized, carbon emission is reduced, and reliability is high.

Description

Technical Field

[0001] This invention relates to the field of centralized heating and heat pump technology, specifically a multi-source heat pump system that is linked with centralized heating to enhance the heating effect. Background Technology

[0002] In the current centralized heating system, large fluctuations in terminal temperatures and high energy consumption are common core pain points. This is especially true in older buildings where aging heating pipes and uneven heat distribution lead to localized overheating or underheating, severely impacting user comfort and heating experience while also resulting in wasted energy. More importantly, under the existing centralized heating model, users are completely passive, unable to adjust heating usage and temperature according to their actual needs, such as family members' schedules and indoor activities. They are forced to passively bear fixed heating costs, resulting in extremely poor flexibility.

[0003] To alleviate the inadequacy of centralized heating, traditional air-source and ground-source heat pump systems are often used as supplementary heating equipment. However, these single-source heat pump systems lack a dynamic coordination mechanism with the centralized heating network, and cannot respond in real time to changes in centralized heating conditions such as fluctuations in supply water temperature, pressure, and outdoor ambient temperature. This leads to a mismatch between the system's operating status and actual heating demand. For example, when the outdoor temperature is low, the heating efficiency of traditional air-source heat pumps drops sharply, and continuing to operate them will result in a significant waste of electricity. Conversely, when the centralized heating supply is sufficient, if the heat pump system is not shut down in time, it will lead to cumulative energy losses, further exacerbating the energy waste problem.

[0004] Furthermore, existing centralized heating billing methods are mostly based on the heated area, which is disconnected from users' actual heating needs. Even if users do not need to maintain excessively high heating temperatures, they still have to pay the full cost, resulting in poor economic efficiency. At the same time, traditional heating systems are extremely limited in function, only providing heating in winter. Summer cooling requires additional air conditioning or other cooling equipment, increasing initial equipment costs for users, occupying extra installation space, and the two systems cannot complement each other's energy, further reducing energy efficiency. Based on these shortcomings, developing a new heating system that can efficiently link with centralized heating to achieve precise temperature control, energy saving, and improved user economy has become an urgent need in the centralized heating sector. Summary of the Invention

[0005] To address the aforementioned deficiencies in existing technologies, the present invention aims to provide a multi-source heat pump system that can be linked with centralized heating to enhance the heating effect, enabling precise temperature control according to actual user needs, reducing heating costs, improving economic efficiency, and simultaneously achieving dual functions of winter heating and summer cooling, optimizing energy utilization efficiency, and reducing carbon emissions.

[0006] To achieve the above objectives, the present invention employs the following technical means:

[0007] A multi-source heat pump system that is linked with a central heating system to enhance the heating effect includes a central heating interface, a dual-source heat pump unit, and a dynamic intelligent control module.

[0008] The dual-source heat pump unit includes a compressor, a multi-way reversing valve, a user heat exchanger located between the compressor and the multi-way reversing valve, and a primary heat exchange circuit and a secondary heat exchange circuit connected in parallel via pipelines.

[0009] The primary heat exchange circuit includes a first expansion valve, one end of which is connected to a multi-way reversing valve via a pipeline, and the other end of which is connected to a compressor via a pipeline. A first heat exchanger is provided in the pipeline between the first expansion valve and the compressor. The first heat exchanger is used to realize heat exchange between the refrigerant and the outdoor air.

[0010] The secondary heat exchange circuit includes a second expansion valve. One end of the second expansion valve is connected to a multi-way reversing valve through a pipeline, and the other end of the second expansion valve is connected to a compressor through a pipeline. A second heat exchanger is provided in the pipeline between the second expansion valve and the compressor. The second heat exchanger is connected to the central heating interface to realize heat exchange between the refrigerant and the central heating hot water.

[0011] The user heat exchanger is connected to the user-side circulating water circuit;

[0012] The dynamic intelligent control module is electrically connected to the temperature sensor group, the compressor, the first expansion valve, and the second expansion valve, and is configured to control the opening and closing of the primary heat exchange circuit and the secondary heat exchange circuit and their collaborative working mode based on the outdoor temperature monitored by the temperature sensor group.

[0013] Preferably, the system also includes a flow regulating valve installed on the inlet pipe of the central heating interface, the flow regulating valve being electrically connected to the dynamic intelligent control module; the dynamic intelligent control module is further configured to adjust the opening of the flow regulating valve according to the operating mode and user-side needs to control the amount of central heating hot water used.

[0014] Preferably, the temperature sensor group includes an inlet water temperature sensor for monitoring the temperature of the central heating water supply, an indoor temperature sensor for monitoring the indoor temperature or the return water temperature on the user side, and an outdoor temperature sensor for monitoring the outdoor temperature.

[0015] Preferably, the multi-way reversing valve is used to switch between cooling and heating cycles; when switching to the cooling cycle, the dynamic intelligent control module controls the secondary heat exchange circuit to close and controls the primary heat exchange circuit to open, so that the system operates in air source heat pump cooling mode.

[0016] Preferably, the pipeline circulation between the first expansion valve, the multi-way reversing valve, and the compressor, and the pipeline circulation between the second expansion valve, the multi-way reversing valve, and the compressor are all refrigerant circuit circulations.

[0017] Preferably, the user-side circulating water circuit includes a primary circulating water pump connected to the inlet of the user heat exchanger, the primary circulating water pump being connected to a heat storage buffer tank, the heat storage buffer tank being connected to a terminal device via a secondary circulating water pump, and the terminal device being connected to the return water inlet of the user heat exchanger via a pipeline, the terminal device being a radiator, a fan coil unit, or underfloor heating.

[0018] Preferably, the dynamic intelligent control module is configured to execute the following mode switching logic:

[0019] When the outdoor temperature is lower than the first preset threshold, the primary heat exchange circuit and the secondary heat exchange circuit are simultaneously turned on to enter the dual-source complementary mode.

[0020] When the outdoor temperature is higher than or equal to the first preset threshold, the primary heat exchange circuit is closed and the secondary heat exchange circuit is opened, entering the central heating priority mode.

[0021] In response to user commands or central heating interruption signals, the secondary heat exchange circuit is shut down and the primary heat exchange circuit is opened, entering the air source independent mode.

[0022] Preferably, in the dual-source complementary mode, the dynamic intelligent control module is further configured to: dynamically adjust the opening ratio of the first expansion valve and the second expansion valve according to the real-time monitored central heating water temperature, outdoor temperature and user-side heat load demand, so as to allocate the heat energy contribution ratio of primary heat exchange and secondary heat exchange.

[0023] Preferably, the dynamic intelligent control module is further configured to: in heating mode, adjust the operating frequency of the compressor and / or the speed of the circulating water pump in the user-side circulating water circuit according to the difference between the user-set temperature and the actual indoor temperature, so as to achieve precise control of the indoor temperature.

[0024] Preferably, the dynamic intelligent control module includes an intelligent controller, an operation panel, a communication module, a storage module, and a power module. The intelligent controller, operation panel, communication module, and storage module are respectively connected to the power module, and the operation panel, communication module, and storage module are respectively connected to the intelligent controller.

[0025] The present invention has the following beneficial effects:

[0026] 1. Achieve precise temperature control and improve heating comfort: This system uses a dynamic intelligent control module to link multi-dimensional temperature sensors to monitor the actual indoor temperature, centralized water supply temperature, and outdoor ambient temperature in real time. Based on the difference between the user-set temperature and the actual indoor temperature, it precisely adjusts the compressor operating frequency, circulating water pump speed, and heat energy distribution ratio of the heat exchange circuit. This effectively solves the problems of large temperature fluctuations at the terminal of traditional centralized heating systems and local overheating or undercooling in old buildings, ensuring that the indoor temperature remains stable within the user's needs and significantly improving living and usage comfort.

[0027] 2. Supports autonomous temperature control to meet personalized needs: Users can independently set the heating temperature and switch operating modes through the control panel or remote communication module, breaking free from the limitations of traditional centralized heating where users passively accept fixed temperatures. Simultaneously, the system supports extending heating time in response to user commands, enabling early startup before centralized heating begins and delayed shutdown after heating ends, fully adapting to the personalized heating needs of different users based on family members' schedules and indoor activity scenarios.

[0028] 3. Significantly Reduce Heating Costs and Improve Economic Efficiency: On the one hand, the system dynamically adjusts the opening of the flow regulating valve, reducing the amount of hot water used for centralized heating while ensuring heating performance. This helps users switch from traditional billing based on heating area to billing based on flow rate. Actual operating condition calculations show that this system can reduce heating flow rate costs by 60% annually. On the other hand, the system optimizes energy utilization through dual-source synergy and intelligent control, achieving a COP value of 20. For the same heating capacity, energy consumption is only 5% of that of pure electric heating. Considering both flow rate and electricity costs, the total annual heating cost can be reduced by 55%, significantly alleviating the financial burden on users.

[0029] 4. Integrated Functionality, Reducing Additional Investment for Users: This system switches between cooling and heating cycles via a multi-way reversing valve. Combined with adaptable terminal equipment, a single unit can simultaneously provide both winter heating and summer cooling, eliminating the need for separate air conditioning or other cooling equipment. This not only reduces initial equipment purchase and installation costs but also saves space required for separate installation of two units, improving both equipment and space utilization.

[0030] 5. Optimize energy utilization and practice energy conservation and environmental protection: The system dynamically switches operating modes, prioritizing the use of centralized heating energy when there is sufficient centralized heating, rationally utilizing low-grade natural air source energy when outdoor temperatures are suitable, and optimizing the distribution ratio of dual-source heat energy during peak energy demand periods to achieve optimal energy allocation. Simultaneously, the system significantly reduces the flow demand and electricity consumption of centralized heating, reducing carbon emissions from the indirect consumption of fossil fuels, aligning with the development trend of energy conservation and environmental protection, and contributing to the construction of a green heating system.

[0031] 6. Ensuring Heating Continuity and Enhancing System Reliability: In the event of a central heating outage, the system can automatically switch to an independent air source mode, absorbing outdoor air heat energy to achieve continuous heating, thus avoiding the heating interruption problems caused by the reliance on the central heating network in traditional heating systems. Furthermore, the system's thermal storage buffer tank can further mitigate temperature fluctuations, improve heating stability, and ensure heating continuity and reliability under special conditions such as extreme weather and central heating network failures. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the modules of the system of the present invention;

[0033] Figure 2 This is a schematic diagram of the dynamic intelligent control module of the present invention;

[0034] In the attached figures, the following labels are used:

[0035] Central heating interface 1, inlet water temperature sensor 2, flow regulating valve 3, second heat exchanger 4, second expansion valve 5, multi-way reversing valve 6, primary circulating water pump 7, thermal storage buffer tank 8, secondary circulating water pump 9, terminal equipment 10, indoor temperature sensor 11, first expansion valve 12, first heat exchanger 13, user heat exchanger 14, outdoor temperature sensor 15, compressor 16, dynamic intelligent control module 17, intelligent controller 171, operation panel 172, communication module 173, storage module 174, power supply module 175. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] like Figure 1-2 As shown, a multi-source heat pump system that is linked with central heating to enhance the heating effect includes a central heating interface 1, a dual-source heat pump unit, and a dynamic intelligent control module 17.

[0038] The dual-source heat pump unit includes a compressor 16, a multi-way reversing valve 6, a user heat exchanger 14 located between the compressor 16 and the multi-way reversing valve 6, and a primary heat exchange circuit and a secondary heat exchange circuit connected in parallel via pipelines.

[0039] The primary heat exchange circuit includes a first expansion valve 12. One end of the first expansion valve 12 is connected to a multi-way reversing valve 6 through a pipeline, and the other end of the first expansion valve 12 is connected to a compressor 16 through a pipeline. A first heat exchanger 13 is provided in the pipeline between the first expansion valve 12 and the compressor 16. The first heat exchanger 13 is used to realize the heat exchange between the refrigerant and the outdoor air.

[0040] The secondary heat exchange circuit includes a second expansion valve 5. One end of the second expansion valve 5 is connected to a multi-way reversing valve 6 through a pipeline, and the other end of the second expansion valve 5 is connected to a compressor 16 through a pipeline. A second heat exchanger 4 is provided in the pipeline between the second expansion valve 5 and the compressor 16. The second heat exchanger 4 is connected to the central heating interface 1 to realize the heat exchange between the refrigerant and the central heating hot water.

[0041] User heat exchanger 14 is connected to the user-side circulating water circuit;

[0042] The dynamic intelligent control module 17 is electrically connected to the temperature sensor group, compressor 16, first expansion valve 12, and second expansion valve 5, and is configured to control the opening and closing of the primary heat exchange circuit and the secondary heat exchange circuit and their collaborative working mode based on the outdoor temperature monitored by the temperature sensor group.

[0043] Furthermore, it also includes a flow regulating valve 3 installed on the inlet pipe of the central heating interface 1, which is electrically connected to the dynamic intelligent control module 17. The dynamic intelligent control module 17 is also configured to adjust the opening of the flow regulating valve 3 according to the operating mode and user-side needs to control the amount of central heating hot water used, so as to realize the on-demand use of central heating energy and further reduce energy consumption.

[0044] Furthermore, the temperature sensor group includes an inlet water temperature sensor 2 for monitoring the temperature of the central heating water supply, an indoor temperature sensor 11 for monitoring the indoor temperature or the return water temperature on the user side, and an outdoor temperature sensor 15 for monitoring the outdoor temperature. Through multi-dimensional temperature monitoring, it provides data support for the precise control of the dynamic intelligent control module 17.

[0045] Furthermore, the multi-way reversing valve 6 is used to switch between cooling and heating cycles; when switching to the cooling cycle, the dynamic intelligent control module 17 controls the secondary heat exchange circuit to close and controls the primary heat exchange circuit to open, so that the system operates in air source heat pump cooling mode, realizing the dual function of winter heating and summer cooling, and improving the versatility of the system.

[0046] Furthermore, the piping circulation between the first expansion valve 12, the multi-way reversing valve 6, and the compressor 16, and the piping circulation between the second expansion valve 5, the multi-way reversing valve 6, and the compressor 16 are both refrigerant circulations. The refrigerant circulation has high-efficiency heat transfer performance, ensuring the heat exchange efficiency of the system.

[0047] Furthermore, the user-side circulating water circuit includes a primary circulating water pump 7 connected to the inlet of the user heat exchanger 14. The primary circulating water pump 7 is connected to a heat storage buffer tank 8. The heat storage buffer tank 8 is connected to a terminal device 10 via a secondary circulating water pump 9. The terminal device 10 is connected to the return port of the user heat exchanger 14 via a pipeline. The terminal device 10 can be a radiator, fan coil unit, or underfloor heating. The heat storage buffer tank 8 can effectively mitigate temperature fluctuations and improve heating stability. The diverse selection of terminal devices can adapt to the heating needs of different buildings.

[0048] Furthermore, the dynamic intelligent control module 17 is configured to execute the following mode switching logic:

[0049] When the outdoor temperature is lower than the first preset threshold, the primary heat exchange circuit and the secondary heat exchange circuit are opened simultaneously to enter the dual-source complementary mode. The first preset threshold can be set according to the actual application scenario, preferably -7℃. At this time, the outdoor temperature is low and the air source heat energy is insufficient. The heating effect is ensured by the coordinated heating of the central heating source and the air source.

[0050] When the outdoor temperature is higher than or equal to the first preset threshold, the primary heat exchange circuit is closed and the secondary heat exchange circuit is opened, entering the central heating priority mode; at this time, the central heating can meet the basic heating demand, the air source circuit is closed, the central heating energy is fully utilized, and the energy consumption of the equipment is reduced.

[0051] In response to user commands or central heating interruption signals, the secondary heat exchange circuit is shut down and the primary heat exchange circuit is opened, entering the air source independent mode; this enables flexible extension of heating time, such as starting the machine in advance before central heating, delaying the shutdown after central heating ends, or ensuring heating continuity when central heating is interrupted.

[0052] Furthermore, in the dual-source complementary mode, the dynamic intelligent control module 17 is also configured to: dynamically adjust the opening ratio of the first expansion valve 12 and the second expansion valve 5 according to the real-time monitored central heating water temperature, outdoor temperature and user-side heat load demand, so as to allocate the heat energy contribution ratio of primary heat exchange and secondary heat exchange, achieve optimal energy allocation and improve energy utilization efficiency.

[0053] Furthermore, the dynamic intelligent control module 17 is also configured to: under heating conditions, adjust the operating frequency of the compressor 16 and / or the speed of the circulating water pump in the user-side circulating water circuit according to the difference between the user-set temperature and the actual indoor temperature, so as to achieve precise control of the indoor temperature and improve the user's heating experience.

[0054] Furthermore, the dynamic intelligent control module 17 includes an intelligent controller 171, an operation panel 172, a communication module 173, a storage module 174, and a power supply module 175. The intelligent controller 171, operation panel 172, communication module 173, and storage module 174 are respectively connected to the power supply module 175, and the operation panel 172, communication module 173, and storage module 174 are respectively connected to the intelligent controller 171. The operation panel 172 facilitates user settings such as temperature and mode switching. The communication module 173 enables remote monitoring and control. The storage module 174 is used to store operating data and control parameters, providing data support for system optimization.

[0055] Working principle

[0056] The core working principle of this system is as follows: A dual-source heat pump unit, including a primary heat exchange loop and a secondary heat exchange loop, collects and enhances heat energy from both the air source and the central heating source. This energy is then transferred to the terminal equipment via a user-side circulating water system. The dynamic intelligent control module 17, based on data monitored by the temperature sensor group, regulates the operating status and mode switching of each component, ultimately achieving precise heating / cooling. The specific workflow is as follows:

[0057] I. Core heat exchange process based on the coordinated operation of fluorine circuit circulation and water circuit circulation

[0058] 1. Heat source acquisition stage: The system has two heat source acquisition paths, which can be operated individually or in combination:

[0059] 1. Air source acquisition primary heat exchange circuit: After the refrigerant is throttled and depressurized by the first expansion valve 12, it becomes a low-temperature refrigerant. When it flows through the first heat exchanger 13, it exchanges heat with the outdoor air and absorbs the low-grade air to achieve a temperature rise. The heated refrigerant flows back to the compressor 16 through the pipeline.

[0060] 2. Central heating source acquisition secondary heat exchange circuit: Central heating hot water enters through central heating interface 1, and after the flow rate is regulated by flow regulating valve 3, it flows into the second heat exchanger 4; refrigerant enters the second heat exchanger 4 after being throttled and depressurized by the second expansion valve 5, and exchanges heat with the central heating hot water to achieve temperature rise. The refrigerant after temperature rise also flows back to compressor 16; the central heating hot water after heat exchange flows back to the central heating network through pipeline.

[0061] 2. Heat Energy Enhancement Stage: The compressor 16 compresses the refrigerant from the primary / secondary heat exchange circuit under high pressure to further increase the refrigerant temperature and form a high-temperature and high-pressure refrigerant; the high-temperature refrigerant is transported to the user's heat exchanger 14 through pipelines.

[0062] 3. Terminal delivery stage: The user-side circulating water circuit is started. The primary circulating water pump 7 delivers the water in the heat storage buffer tank 8 to the user heat exchanger 14 for heat exchange with the high-temperature refrigerant in heating or cooling mode. The water after heat exchange is delivered to the terminal equipment 10 radiator / fan coil / underfloor heating via the secondary circulating water pump 9 to achieve indoor temperature regulation. The water that has completed heat exchange flows back to the user heat exchanger 14, forming a closed loop.

[0063] II. Core Control Unit for Intelligent Control and Mode Switching Logic: Dynamic Intelligent Control Module 17

[0064] 1. Data Acquisition Basics: Temperature sensor group provides real-time feedback of key data: Inlet water temperature sensor 2 monitors the central heating water supply temperature, outdoor temperature sensor 15 monitors the outdoor ambient temperature, and user indoor temperature sensor 11 monitors the indoor temperature / user-side return water temperature. The data is synchronously transmitted to the intelligent controller 171 of the dynamic intelligent control module 17.

[0065] 2. Mode Switching and Control: Based on monitoring data and user commands, the intelligent controller 171 switches between cooling and heating cycles via the multi-way reversing valve 6, and simultaneously controls the opening and closing of the first expansion valve 12 and the second expansion valve 5 to achieve switching between three operating modes:

[0066] 1. Central heating priority mode: When the outdoor temperature is ≥ the first preset threshold (default -7℃), the intelligent controller 171 closes the first expansion valve 12 and opens the second expansion valve 5, only starting the secondary heat exchange circuit; at the same time, it adjusts the opening of the flow regulating valve 3 to control the amount of hot water used for central heating, and adjusts the operating frequency of the compressor 16 to ensure stable indoor temperature.

[0067] 2. Dual-source complementary mode: When the outdoor temperature is less than the first preset threshold, the intelligent controller 171 simultaneously opens the first expansion valve 12 and the second expansion valve 5, and the dual-loop operates in coordination. Based on the central heating water temperature, outdoor temperature and user-side heat load, the opening ratio of the two expansion valves is dynamically adjusted to allocate the heat energy contribution ratio of the two heat sources and achieve optimal energy utilization.

[0068] 3. Independent Air Source Mode: When receiving a user's instruction to extend heating or a signal indicating interruption of centralized heating, the intelligent controller 171 closes the second expansion valve 5 and the flow regulating valve 3, and only opens the first expansion valve 12, collecting air source heat energy independently through a primary heat exchange circuit to ensure continuous heating.

[0069] 4 Cooling Mode: After the user issues a cooling command, the multi-way reversing valve 6 switches the circulation direction, and the intelligent controller 171 closes the second expansion valve 5 and opens the first expansion valve 12; the refrigerant absorbs outdoor heat through the first heat exchanger 13, and then releases heat through the user heat exchanger 14 after being compressed by the compressor 16, thereby achieving indoor cooling through the terminal device 10.

[0070] 3. Precise temperature control and fine-tuning: In heating / cooling mode, the intelligent controller 171 compares the difference between the user-set temperature and the actual indoor temperature, and dynamically adjusts the operating frequency of the compressor 16 and the speed of the primary / secondary circulating water pump to ensure accurate and stable indoor temperature; relevant operating parameters are recorded through the storage module 174, and users can achieve local / remote control through the operation panel 172 or the communication module 173.

[0071] Example 1

[0072] Scenario of household heating system renovation in old residential communities

[0073] 1. Scenario Characteristics: This scenario is an old residential community in northern China built in 2000. The original centralized heating pipes are aging, and the terminals use traditional cast iron radiators, resulting in local room temperature fluctuations of ±3℃ and a large temperature difference between the top floor and the first floor. The user's needs are to solve the uneven temperature, achieve independent temperature control, and reduce heating costs. The lowest outdoor temperature in winter is about -15℃, and the centralized heating water supply temperature is usually 40-45℃. The billing method is based on the heated area.

[0074] 2. System Configuration: This dual-source heat pump system is selected. The existing cast iron radiator of the terminal device 10 is retained without additional modification; the first preset threshold of the dynamic intelligent control module 17 is set to -7℃; the indoor temperature sensor 11 in the temperature sensor group is installed on the living room wall to monitor the indoor temperature; the flow regulating valve 3 is an electric two-way regulating valve to adapt to the flow regulation needs of the old pipe network; the heat storage buffer water tank 8 has a volume of 30L to mitigate temperature fluctuations.

[0075] 3. Operating Mode and Control Logic:

[0076] 1. During normal heating, when the outdoor temperature is -5℃ to -7℃: the system enters the centralized heating priority mode. The dynamic intelligent control module 17 closes the first expansion valve 12 and opens the second expansion valve 5. The inlet water temperature sensor 2 monitors the centralized heating water supply temperature as 42℃. The user sets the room temperature to 22℃. The intelligent controller 171 adjusts the flow regulating valve 3 to 60% to control the amount of hot water used for centralized heating. At the same time, the compressor 16 is adjusted to run at 35Hz, the primary circulation pump 7 is set to 1200r / min, and the secondary circulation pump 9 is set to 1000r / min to ensure that the indoor temperature is stable at 22℃ and to avoid overheating or overcooling of the original system.

[0077] 2. In extremely cold weather with outdoor temperatures of -12℃ to -7℃: the system automatically switches to dual-source complementary mode, simultaneously opening the first expansion valve 12 and the second expansion valve 5; based on data from the outdoor temperature sensor 15 and the inlet water temperature sensor 2, the intelligent controller 171 adjusts the opening ratio of the two expansion valves to 3:7 (30% for the first expansion valve and 70% for the second expansion valve), increasing the proportion of heating from the centralized heating source; the compressor 16 increases its operating frequency to 50Hz to ensure heating capacity in low-temperature environments; the thermal storage buffer tank 8 plays a role in heat preservation, preventing a sudden drop in temperature at night.

[0078] 3. Cost Optimization: After the renovation, the user negotiated with the central heating provider to switch to billing based on flow rate. By precisely adjusting the flow rate, the monthly consumption of hot water for central heating was reduced by 62% compared to before the renovation. Combined with the energy-saving advantage of the compressor's low-frequency operation, statistics show that the user's winter heating costs were reduced by 58% compared to before the renovation, far exceeding the expected target.

[0079] Example 2

[0080] Integrated heating and cooling system in newly built commercial housing

[0081] 1. Scenario characteristics: This scenario is a newly built residential community in southern China. In winter, heating is required when the outdoor temperature is as low as -2℃, and in summer, cooling is required. The user needs a single device to achieve both heating and cooling functions, while also considering energy saving and intelligent remote control. The centralized heating system has a water supply temperature of 50℃. The user has high requirements for living comfort, requiring room temperature fluctuations of ≤±0.5℃.

[0082] 2. System Configuration: The terminal device 10 uses a fan coil unit to adapt to the switching requirements of heating and cooling; the first preset threshold of the dynamic intelligent control module 17 is set to 0℃ to adapt to the temperature characteristics of winter in the south; the user's indoor temperature sensor 11 is installed on the user's side return water pipe to monitor the return water temperature and improve the temperature control accuracy; the communication module 173 uses 5G+WiFi dual-mode to support remote APP control; the thermal storage buffer water tank 8 has a volume of 50L, which works with the fan coil unit to achieve rapid heating / cooling.

[0083] 3. Operating Mode and Control Logic:

[0084] 1. When the outdoor temperature is 5℃ or ≥0℃ during winter heating: the system enters the centralized heating priority mode, closes the first expansion valve 12, and opens the second expansion valve 5; the user sets the room temperature to 23℃ through the mobile APP, and the intelligent controller 171 adjusts the opening of the flow regulating valve 3 to 50% according to the return water temperature monitoring value of 45℃. The compressor 16 operates at a frequency of 28Hz, and the speed of the circulating water pump is adapted to the flow requirements of the fan coil unit to achieve precise heating, and the room temperature fluctuation is controlled within 22.8-23.2℃.

[0085] 2. Summer Cooling: After the user issues a cooling command, the multi-way reversing valve 6 switches the circulation direction, the system closes the second expansion valve 5 and opens the first expansion valve 12, entering the independent air source cooling mode; the refrigerant absorbs outdoor heat through the first heat exchanger 13 at an outdoor temperature of 35℃, and after compression by the compressor 16, it releases heat in the user's heat exchanger 14, the fan coil unit starts the cooling mode, and the intelligent controller 171 adjusts the compressor frequency according to the indoor temperature to achieve constant temperature cooling of 26℃, reducing energy consumption by 25% compared to traditional split air conditioners.

[0086] 3. Transitional seasons in spring and autumn: Users can activate the independent air source mode through the APP to achieve light heating / cooling by utilizing low-grade outdoor heat energy, without having to start centralized heating or high-energy-consuming cooling, further improving energy efficiency.

[0087] Example 3

[0088] Independent heating system for villas in frigid regions

[0089] 1. Scenario characteristics: This scenario is a villa project in Northeast China, where the lowest outdoor temperature in winter is -25℃. Central heating is only available from mid-November to mid-March of the following year. The user needs to extend the heating period, starting heating earlier at the end of October and delaying heating at the end of March to ensure the stability of heating under extreme low temperatures, while also enabling independent temperature settings for the living room, bedroom, and study.

[0090] 2. System Configuration: The terminal device 10 adopts a floor heating system with three loops, corresponding to three areas; the first preset threshold of the dynamic intelligent control module 17 is set to -10℃ to adapt to the temperature characteristics of extremely cold regions; the temperature sensor group is equipped with user indoor temperature sensors 11 in each area to achieve regional monitoring; the flow regulating valve 3 is a high-precision electric regulating valve, which is suitable for precise flow control under extreme low temperatures; the heat storage buffer water tank 8 has a volume of 100L to enhance the system's heat storage capacity.

[0091] 3. Operating Mode and Control Logic:

[0092] 1. Extreme low temperature outdoor temperature -22℃, <-10℃: The system enters the dual-source complementary mode, the opening ratio of the first expansion valve 12 and the second expansion valve 5 is adjusted to 2:8, the centralized heating heat source water supply temperature of 48℃ is utilized to the maximum extent, and the air source is used to supplement heat energy; the compressor 16 operates at full load frequency of 50Hz, and the underfloor heating system circulating water pump operates at high speed to ensure that the temperature in each area reaches the standard of 24℃ in the living room, 22℃ in the bedroom and 23℃ in the study.

[0093] 2. Extended heating period until the end of October, when centralized heating is not in operation: The system responds to user commands and enters independent air source mode, closing the second expansion valve 5 and flow regulating valve 3, and only opening the first expansion valve 12; it absorbs low-grade outdoor heat energy (outdoor temperature -5℃) through the first heat exchanger 13, and after being compressed and heated by the compressor, it supplies heat to the underfloor heating system. The intelligent controller 171 adjusts the circulating water pump branch valves according to the set temperature of each area to achieve precise temperature control in different areas and meet the user's demand for early heating.

[0094] 3. Emergency response to central heating interruption: If central heating is temporarily interrupted in winter, the system will automatically detect the central heating interruption signal and immediately switch to the independent air source mode. With the help of the heat storage capacity of the heat storage buffer tank 8, the system will ensure the continuity of heating, avoid a sudden drop in indoor temperature, and improve the reliability of the system.

[0095] The examples provided in this invention are not intended to limit the implementation. Those skilled in the art will recognize that various variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations, and any obvious variations or modifications derived therefrom are still within the scope of this invention.

Claims

1. A multi-source heat pump system that is linked with centralized heating for enhancing heating performance, characterized in that, It includes a central heating interface (1), a dual-source heat pump unit, and a dynamic intelligent control module (17). The dual-source heat pump unit includes a compressor (16) connected by a pipeline, a multi-way reversing valve (6), a user heat exchanger (14) disposed between the compressor (16) and the multi-way reversing valve (6), and a primary heat exchange circuit and a secondary heat exchange circuit disposed in parallel. The primary heat exchange circuit includes a first expansion valve (12), one end of which is connected to a multi-way reversing valve (6) via a pipeline, and the other end of which is connected to a compressor (16) via a pipeline. A first heat exchanger (13) is provided in the pipeline between the first expansion valve (12) and the compressor (16). The first heat exchanger (13) is used to realize the heat exchange between the refrigerant and the outdoor air. The secondary heat exchange circuit includes a second expansion valve (5), one end of which is connected to a multi-way reversing valve (6) via a pipeline, and the other end of which is connected to a compressor (16) via a pipeline. A second heat exchanger (4) is provided in the pipeline between the second expansion valve (5) and the compressor (16). The second heat exchanger (4) is connected to the central heating interface (1) to realize heat exchange between the refrigerant and the central heating hot water. The user heat exchanger (14) is connected to the user-side circulating water circuit; The dynamic intelligent control module (17) is electrically connected to the temperature sensor group, the compressor (16), the first expansion valve (12), and the second expansion valve (5), and is configured to control the opening and closing of the primary heat exchange circuit and the secondary heat exchange circuit and their collaborative working mode according to the outdoor temperature monitored by the temperature sensor group.

2. The multi-source heat pump system for enhancing heating effect in conjunction with centralized heating as described in claim 1, characterized in that, It also includes a flow regulating valve (3) installed on the water inlet pipe of the central heating interface (1), the flow regulating valve (3) being electrically connected to the dynamic intelligent control module (17); the dynamic intelligent control module (17) is also configured to adjust the opening of the flow regulating valve (3) according to the operating mode and user side demand to control the amount of central heating hot water taken out.

3. A multi-source heat pump system for enhancing heating effect in conjunction with centralized heating, as described in claim 1, is characterized in that... The temperature sensor group includes an inlet water temperature sensor (2) for monitoring the temperature of the central heating water supply, an indoor temperature sensor (11) for monitoring the indoor temperature or the return water temperature on the user side, and an outdoor temperature sensor (15) for monitoring the outdoor temperature.

4. A multi-source heat pump system for enhancing heating effect in conjunction with centralized heating, as described in claim 1, is characterized in that... The multi-way reversing valve (6) is used to switch between cooling and heating cycles. When switching to the cooling cycle, the dynamic intelligent control module (17) controls the secondary heat exchange circuit to close and controls the primary heat exchange circuit to open, so that the system operates in air source heat pump cooling mode.

5. A multi-source heat pump system for enhancing heating effect in conjunction with centralized heating as described in claim 1, characterized in that, The pipeline circulation between the first expansion valve (12), the multi-way reversing valve (6), and the compressor (16) and the pipeline circulation between the second expansion valve (5), the multi-way reversing valve (6), and the compressor (16) are both refrigerant circuit circulation.

6. A multi-source heat pump system for enhancing heating effect in conjunction with centralized heating, as described in claim 1, is characterized in that... The user-side circulating water circuit includes a primary circulating water pump (7) connected to the inlet of the user heat exchanger (14). The primary circulating water pump (7) is connected to a heat storage buffer tank (8). The heat storage buffer tank (8) is connected to a terminal device (10) via a secondary circulating water pump (9). The terminal device (10) is connected to the return water outlet of the user heat exchanger (14) via a pipeline. The terminal device (10) is a radiator, fan coil unit, or underfloor heating.

7. A multi-source heat pump system for enhancing heating effect in conjunction with centralized heating as described in claim 1, characterized in that, The dynamic intelligent control module (17) is configured to execute the following mode switching logic: When the outdoor temperature is lower than the first preset threshold, the primary heat exchange circuit and the secondary heat exchange circuit are simultaneously turned on to enter the dual-source complementary mode. When the outdoor temperature is higher than or equal to the first preset threshold, the primary heat exchange circuit is closed and the secondary heat exchange circuit is opened, entering the central heating priority mode. In response to user commands or central heating interruption signals, the secondary heat exchange circuit is shut down and the primary heat exchange circuit is opened, entering the air source independent mode.

8. A multi-source heat pump system for enhancing heating effect in conjunction with centralized heating, as described in claim 7, is characterized in that... In the dual-source complementary mode, the dynamic intelligent control module (17) is also configured to: dynamically adjust the opening ratio of the first expansion valve (12) and the second expansion valve (5) according to the real-time monitored central heating water temperature, outdoor temperature and user-side heat load demand, so as to allocate the heat energy contribution ratio of primary heat exchange and secondary heat exchange.

9. A multi-source heat pump system for enhancing heating effect in conjunction with centralized heating, as described in claim 1, is characterized in that... The dynamic intelligent control module (17) is also configured to: under heating conditions, adjust the operating frequency of the compressor (16) and / or the speed of the circulating water pump in the user-side circulating water circuit according to the difference between the user-set temperature and the actual indoor temperature, so as to achieve precise control of the indoor temperature.

10. A multi-source heat pump system for enhancing heating effect in conjunction with centralized heating, as described in any one of claims 7-9, characterized in that, The dynamic intelligent control module (17) includes an intelligent controller (171), an operation panel (172), a communication module (173), a storage module (174), and a power module (175). The intelligent controller (171), operation panel (172), communication module (173), and storage module (174) are respectively connected to the power module (175), and the operation panel (172), communication module (173), and storage module (174) are respectively connected to the intelligent controller (171).

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