Multi-energy multi-user clean energy heat supply pipe network system

Abstract

The utility model belongs to the technical field of heating, and particularly relates to a multi-energy multi-user clean energy heat supply pipe network system which comprises a main circulation pipeline, the main circulation pipeline comprises a heat source side and a user side, and the heat source side is sequentially connected with at least two sets of clean energy heat supply systems in series in a bypass mode in the circulation direction. Compared with the prior art, a plurality of clean energy sources are connected to the main circulation pipeline in a bypass mode in series, one or more primary energy sources are used during use, the advantages of various primary energy sources are fully utilized, the plurality of heating systems are connected to the main circulation pipeline in a bypass mode in series, and the heat supply efficiency is improved. Each user can select a heating mode according to the temperature requirement.

Description

Technical Field

[0001] This utility model belongs to the field of heating technology, specifically relating to a multi-energy, multi-user clean energy heating network system. Background Technology

[0002] Background of Clean Energy Utilization

[0003] Traditional fossil fuels are non-renewable energy sources with limited reserves, facing depletion as extraction and consumption increase. Clean energy sources, such as solar, wind, hydro, and bioenergy, are renewable energy sources with inexhaustible resources, capable of meeting long-term human energy needs and achieving sustainable energy development. Developing clean energy can diversify energy supply, reduce dependence on imported fossil fuels, and enhance the security and stability of energy supply.

[0004] Clean energy sources each have their own characteristics, and the combined use of multiple energy sources can complement each other's advantages.

[0005] While clean energy boasts advantages such as environmental friendliness, renewable resources, and wide distribution, it also presents numerous disadvantages, including low energy density, high intermittency, and high technological dependence. Therefore, the organic combination and coordinated operation of various energy types to achieve efficient energy utilization and optimized system operation has become a reliable option for clean energy utilization. Multi-energy coupling enables different energy sources to complement and optimize each other during production, transmission, distribution, and use, reducing energy waste; multiple energy sources can be used for mutual backup and regulation, mitigating the impact of fluctuations in the supply of a single energy source on the system; and the intermittency and instability of clean energy can be addressed, promoting its large-scale application.

[0006] Modular design of multi-energy, multi-user clean energy system

[0007] Because various clean energy sources have their own characteristics and user needs vary greatly, it is important to integrate the design of various clean energy sources and user needs to meet the heating needs of various clean energy sources and users with different heating methods. Utility Model Content

[0008] To address the challenge of integrating multiple clean energy sources and meeting diverse user needs, this utility model provides a multi-energy, multi-user clean energy heating network system.

[0009] The purpose of this utility model is achieved in the following manner: a multi-energy, multi-user clean energy heating network system, including a main circulation pipeline, the main circulation pipeline including a heat source side and a user side, wherein:

[0010] On the heat source side, at least two sets of clean energy heating systems are connected in series and bypassed along the circulation direction.

[0011] On the user side, at least two sets of heating systems are connected in series and bypassed along the circulation direction.

[0012] Furthermore, the clean energy heating system is at least one of buried pipe and air-cooled heat pump 3.

[0013] Furthermore, the heating system is at least one of radiator heating system 17, fan coil heating system 18, and underfloor heating system 19.

[0014] Furthermore, at least two sets of clean energy heating systems are sequentially connected in series and bypassed along the circulation direction on the heat source side, arranged in order of increasing heating capacity.

[0015] Furthermore, at least two sets of heating systems, connected in series and bypassed along the circulation direction on the heating side, are set up in order of decreasing temperature requirement.

[0016] Furthermore, each clean energy heating system is connected to the main circulation pipeline via a bypass loop, and each bypass loop is equipped with a separate circulating water pump.

[0017] Furthermore, the heating system terminal is connected to the heat pump unit through a secondary pipe network, and a circulation pump is installed between the heat pump unit and the secondary pipe network; the heat pump unit is connected to the main circulation pipe through a bypass circuit, and a circulation pump is installed in the bypass circuit.

[0018] As a specific solution, the heating side is connected in series with bypasses along the circulation direction:

[0019] The shallow geothermal buried pipe 1, a bypass loop of the main circulation system is connected in sequence to the shallow geothermal buried pipe circulation pump 4 and the input end of the shallow geothermal buried pipe 1 through the inlet pipe, and the output end of the shallow geothermal buried pipe 1 is connected to the main circulation pipe through the return pipe.

[0020] The medium-deep geothermal buried pipe 2, a bypass loop of the main circulation system is connected in sequence to the medium-deep geothermal buried pipe circulation pump 5 and the input end of the medium-deep geothermal buried pipe 2 through the inlet pipe, and the output end of the medium-deep geothermal buried pipe 2 is connected to the main circulation pipe through the return pipe.

[0021] The air-cooled heat pump 3 has a bypass loop of the main circulation system connected to the air-cooled heat pump circulation pump 6 and the input end of the air-cooled heat pump 3 in sequence through the water inlet pipe. The output end of the air-cooled heat pump 3 is connected to the main circulation pipe through the water return pipe.

[0022] The heating side is connected in series with bypasses along the circulation direction:

[0023] The radiator heating system 17 has a bypass loop of the main circulation system connected in sequence to the input end of the evaporator of the distribution pump a11 and the heat pump unit a8 via the inlet water pipe. The output end of the evaporator of the heat pump unit a8 is connected to the main circulation pipe via the return water pipe. The input end of the condenser of the heat pump unit a8 is connected in sequence to the output end of the heating circulation pump a14 and the radiator heating system 17 via the inlet water pipe. The input end of the radiator heating system 17 is connected to the output end of the condenser of the heat pump unit a8 via the supply water pipe.

[0024] The fan coil heating system 18 has a bypass loop of the main circulation system connected in sequence to the input end of the evaporator of the distribution pump b12 and the heat pump unit b9 via the inlet water pipe. The output end of the evaporator of the heat pump unit b9 is connected to the main circulation pipe via the return water pipe. The input end of the condenser of the heat pump unit b9 is connected in sequence to the output end of the heating circulation pump b15 and the fan coil heating system 18 via the inlet water pipe. The input end of the fan coil heating system 18 is connected to the output end of the condenser of the heat pump unit b9 via the supply water pipe.

[0025] The underfloor heating system 19 has a bypass loop of the main circulation system connected in sequence to the input end of the evaporator of the distribution pump c13 and the heat pump unit c10 via the inlet water pipe. The output end of the evaporator of the heat pump unit c10 is connected to the main circulation pipe via the return water pipe. The input end of the condenser of the heat pump unit c10 is connected in sequence to the output end of the heating circulation pump c16 and the underfloor heating system 19 via the inlet water pipe. The input end of the underfloor heating system 19 is connected to the output end of the condenser of the heat pump unit c10 via the supply water pipe.

[0026] Compared to existing technologies, this utility model bypasses and connects multiple clean energy sources in series to the main circulation pipeline. When in use, one or more primary energy sources are activated, making full use of the advantages of various primary energy sources. Multiple heating systems are bypassed and connected in series to the main circulation pipeline, and each user can choose the heating method according to their temperature requirements. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a multi-energy, multi-user clean energy heating network system.

[0028] Among them, 1. Shallow geothermal buried pipe, 2. Medium-deep geothermal buried pipe, 3. Air-cooled heat pump, 4. Shallow geothermal buried pipe circulation pump, 5. Medium-deep geothermal buried pipe circulation pump, 6. Air-cooled heat pump circulation pump, 7. Main circulation pump, 8. Heat pump unit a, 9. Heat pump unit b, 10. Heat pump unit c, 11. Distribution pump a, 12. Distribution pump b, 13. Distribution pump c, 14. Heating circulation pump a, 15. Heating circulation pump b, 16. Heating circulation pump c, 17. Radiator heating system, 18. Fan coil heating system, 19. Underfloor heating system. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] As attached Figure 1 As shown, a multi-energy, multi-user clean energy heating network system includes a main circulation pipeline, which comprises a heat source side and a user side, wherein:

[0032] On the heat source side, at least two sets of clean energy heating systems are connected in series and bypassed along the circulation direction.

[0033] On the user side, at least two sets of heating systems are connected in series and bypassed along the circulation direction.

[0034] Definition of "Bypass Series": Bypass series refers to a technical means of adding a bypass pipeline to a series system to solve the problems of uneven flow distribution and system maintenance. In this utility model, bypass series means that the heat source and user system are connected to the main circulation pipeline through a bypass. When the bypass pipeline is closed, it does not affect the circulation of the main circulation pipeline itself.

[0035] Furthermore, the clean energy system is at least one of a buried pipe and an air-cooled heat pump 3. Both the buried pipe and the air-cooled heat pump 3 are existing technologies, and this application does not involve any improvement to their structure.

[0036] Furthermore, the user-supply system is at least one of the following: radiator heating system 17 (generally a municipal heating network + radiators), fan coil heating system 18 (a fan coil unit is an air conditioning terminal device, mainly composed of a fan, a motor, and a coil. Its working principle is that the fan drives indoor air to flow through the coil, and the cold or hot water in the coil exchanges heat with the air, thereby regulating the indoor temperature), and underfloor heating system 19. Radiators, fan coil units, and underfloor heating are all existing technologies, and this application does not involve any improvement to their structure. The above-mentioned heating system can be a total system covering the heating equipment in all buildings in a building or even a region, and is considered existing technology.

[0037] Furthermore, at least two sets of clean energy heating systems are sequentially connected in series and bypassed along the circulation direction on the heat source side, arranged in order of increasing heating capacity. Heating capacity refers to the upper limit of the heat exchange temperature that the system can provide to the circulating water. For example, in this application, a shallow geothermal buried pipe 1 system is arranged in sequence. The shallow geothermal buried pipe 1 is generally buried at a depth of less than 200m, corresponding to geothermal energy of 10℃-25℃; a medium-deep geothermal buried pipe 2 system is arranged. The medium-deep geothermal buried pipe 2 is generally buried at a depth of 500-5000m, commonly around 3500m, corresponding to geothermal energy of 25℃-90℃; and an air-cooled heat pump 3 system is arranged. The air-cooled heat pump 3 works through a compression refrigeration cycle, using refrigerant to absorb heat from the air. Its output water temperature can reach up to 60℃. The above is the preferred solution proposed by this utility model. In actual use, the number of heating systems and the arrangement of different heating temperatures can be determined according to the actual heat output of the heating system.

[0038] Furthermore, at least two sets of heating systems connected in series and bypassed along the circulation direction on the user side are arranged sequentially from high to low temperature requirements. This can be achieved by leading out heating pipes in a stepped manner along the circulation direction of the main circulation pipe, allowing users to use heating at the corresponding stepped temperature according to their needs. Preferably, the heating systems are arranged in a stepped manner. Specifically, for example, in this application, a radiator heating system 17 is arranged sequentially, with a standard inlet temperature between 60℃ and 80℃ and an outlet temperature between 40℃ and 60℃, indicating a higher temperature requirement; a fan coil heating system 18 requires a water temperature of 45℃ for fan coil heating, with a return water temperature typically around 40℃; and a floor heating system 19 requires a floor heating water temperature typically between 35-45℃, with a return water temperature difference of approximately 10℃ from the supply water temperature. The above is the preferred solution proposed by this utility model. In actual use, the number of heating systems and the arrangement of temperature requirements can be determined according to the user's actual needs.

[0039] Furthermore, each clean energy system is connected to the main circulation pipeline through a bypass loop, and each bypass loop is equipped with a circulating water pump; the heating system terminal is connected to the heat pump unit through a secondary pipeline network, and a circulating pump is installed between the heat pump unit and the secondary pipeline network; this allows each energy source and user to be equipped with its own circulating pump, without consuming the head of the main circulation pump, and the hydraulic balance adjustment of the pipeline network is convenient.

[0040] Furthermore, as a practical solution, refer to Figure 1 ,

[0041] The heating side is connected in series with bypasses along the circulation direction:

[0042] The shallow geothermal buried pipe 1, a bypass loop of the main circulation system is connected in sequence to the shallow geothermal buried pipe circulation pump 4 and the input end of the shallow geothermal buried pipe 1 through the inlet pipe, and the output end of the shallow geothermal buried pipe 1 is connected to the main circulation pipe through the return pipe.

[0043] The medium-deep geothermal buried pipe 2, a bypass loop of the main circulation system is connected in sequence to the medium-deep geothermal buried pipe circulation pump 5 and the input end of the medium-deep geothermal buried pipe 2 through the inlet pipe, and the output end of the medium-deep geothermal buried pipe 2 is connected to the main circulation pipe through the return pipe.

[0044] The air-cooled heat pump 3 has a bypass loop of the main circulation system connected to the air-cooled heat pump circulation pump 6 and the input end of the air-cooled heat pump 3 in sequence through the water inlet pipe. The output end of the air-cooled heat pump 3 is connected to the main circulation pipe through the water return pipe.

[0045] For the aforementioned heating system, the connection end between the return water pipe and the main circulation pipe is located at the rear end of the connection end between the inlet water pipe and the main circulation pipe along the circulation direction of the main circulation pipe.

[0046] The heating side is connected in series with bypasses along the circulation direction:

[0047] The radiator heating system 17 has a bypass loop of the main circulation system connected in sequence to the input end of the evaporator of the distribution pump a11 and the heat pump unit a8 via the inlet water pipe. The output end of the evaporator of the heat pump unit a8 is connected to the main circulation pipe via the return water pipe. The input end of the condenser of the heat pump unit a8 is connected in sequence to the output end of the heating circulation pump a14 and the radiator heating system 17 via the inlet water pipe. The input end of the radiator heating system 17 is connected to the output end of the condenser of the heat pump unit a8 via the supply water pipe.

[0048] The fan coil heating system 18 has a bypass loop of the main circulation system connected in sequence to the input end of the evaporator of the distribution pump b12 and the heat pump unit b9 via the inlet water pipe. The output end of the evaporator of the heat pump unit b9 is connected to the main circulation pipe via the return water pipe. The input end of the condenser of the heat pump unit b9 is connected in sequence to the output end of the heating circulation pump b15 and the fan coil heating system 18 via the inlet water pipe. The input end of the fan coil heating system 18 is connected to the output end of the condenser of the heat pump unit b9 via the supply water pipe.

[0049] The underfloor heating system 19 has a bypass loop of the main circulation system connected in sequence to the input end of the evaporator of the distribution pump c13 and the heat pump unit c10 via the inlet water pipe. The output end of the evaporator of the heat pump unit c10 is connected to the main circulation pipe via the return water pipe. The input end of the condenser of the heat pump unit c10 is connected in sequence to the output end of the heating circulation pump c16 and the underfloor heating system 19 via the inlet water pipe. The input end of the underfloor heating system 19 is connected to the output end of the condenser of the heat pump unit c10 via the supply water pipe.

[0050] For the aforementioned heating system, the connection end between the return water pipe and the main circulation pipe of the heat pump unit is located at the rear end of the connection end between the inlet water pipe and the main circulation pipe along the circulation direction of the main circulation pipe.

[0051] Heat pump units are a current technology that includes components such as evaporators, condensers, compressors, and expansion valves. They transfer energy from low-temperature areas to high-temperature areas through Carnot cycles or reverse Carnot cycles and are mostly used for air conditioning, refrigeration, and heating.

[0052] Multiple clean energy sources with different temperature qualities are connected to a heating network in a bypass series connection. The heat energy is preferably delivered to the network in order of increasing temperature quality of the clean energy sources. Each clean energy source can operate independently or in combination for high efficiency. Multiple users are connected to the heating network in a bypass connection. Users can utilize the heat energy in the network in a graded manner from high to low according to their own needs. Each user can operate independently or in combination for high efficiency.

[0053] Each energy source and user is equipped with its own circulating water pump, which does not consume the head of the main circulating water pump and facilitates the hydraulic balance adjustment of the pipeline network.

[0054] Multiple clean energy sources are selected and heat is input into the system in order of increasing heating temperature, making full use of the heating potential of various clean energy sources, reducing the circulation flow of the pipeline network, and increasing the heating capacity of the pipeline network.

[0055] Each user can choose the connection method according to their temperature requirements. Connecting to a high-temperature water supply can provide direct heating, while connecting to a lower-temperature return water supply can be boosted by a heat pump for utilization.

[0056] (1) A shallow geothermal buried pipe 1 and a shallow geothermal buried pipe circulation pump 4 form a loop, a medium-deep geothermal buried pipe 2 and a medium-deep geothermal buried pipe circulation pump 5 form a loop, and an air-cooled heat pump 3 and an air-cooled heat pump circulation pump 6 form a loop, which are connected to the main circulation pipeline in a bypass manner. Similarly, other primary energy sources such as industrial waste heat, solar energy, and reclaimed water can also be connected in the same way.

[0057] (2) with Figure 1 Taking a bypass circuit consisting of a shallow geothermal buried pipe 1 and a shallow geothermal buried pipe circulation pump 4 as an example: The shallow geothermal buried pipe circulation pump 4 is configured according to the system settings of the heating capacity, supply and return water temperatures, and pressure drop of the shallow geothermal buried pipe 1. When this bypass circuit is running, all or part of the circulating water in the main circulation pipeline enters this bypass circuit for heating before flowing back into the heating network, thus heating the circulating water in the main circulation pipeline. When this bypass circuit is shut down, the system circulating water circulates through the main circulation pipeline, and this bypass circuit is in a short-circuit state. Similarly, other bypass circuits operate on the same principle. Each bypass circuit is an independent module, and their start and stop are relatively independent and do not affect each other.

[0058] (3) Arrange the primary energy supply water temperature from low to high. At full load: open all heat source bypass circuits and heat the circulating water through each bypass circuit in turn, as shown in the figure: the ground source heat pump buried pipe 1 heats the main circulation pipeline return water (all water) from 5℃ to 10℃, the medium-deep geothermal buried pipe 2 continues to heat the main circulation pipeline return water (partial water) to 25℃, and after mixing with the main circulation pipeline, it reaches 25℃. The air-cooled heat pump 3 continues to heat the main circulation pipeline return water (partial water) to 30℃, and after mixing with the main circulation pipeline, it reaches 25℃ (the temperature calculation is for illustration purposes, and different proportions of energy will result in different temperatures). Adjust the main circulation water pump 7 to finally make the supply water temperature meet the system design requirements. At partial load, one or more bypass circuits can be opened to heat the system based on factors such as primary energy supply cost, heat and cold balance, and recovery cycle.

[0059] (4) According to the supply water temperature of heat users, they are arranged in order from high to low. At full load: all heat user bypass circuits are opened, and circulating water is supplied with heat step by step through each bypass circuit, as shown in the figure: heat pump unit a 8 takes heat from the self-circulating pipeline, the water supply (partial water) in the main circulating pipeline is cooled from 30℃ to 20℃, and after being mixed with water in the main circulating pipeline, it reaches 25℃. Heat pump unit b 9 continues to take heat from the main circulating pipeline, and the water supply (all water) in the main circulating pipeline is cooled to 15℃. Heat pump unit c 10 continues to take heat from the self-circulating pipeline, and the water supply (all water) in the main circulating pipeline is cooled to 5℃. (The temperature calculation is for illustration purposes. Different proportions of energy mixing will result in different temperatures.) At partial load, the supply and return water temperatures can be considered based on factors such as primary energy supply cost and heat pump energy efficiency to minimize the overall operating cost of the system.

[0060] The temperature values ​​mentioned above are for reference only and should be adjusted according to actual working conditions.

[0061] (5) When the initial heating load is low, the higher initial water temperature of the medium-deep geothermal layer 2 can be used for direct heating.

[0062] The above extensions can further achieve the following beneficial effects:

[0063] 1. Multiple energy sources are connected to a single heating network via bypass and series connections. Spatially, these energy sources can be distributed, and bypass circulation pipelines for different energy sources can be connected to the main circulation network nearby, offering flexible installation. This reduces energy consumption in bypass branches without increasing pressure drop in the main network; it also reduces the area required for energy stations; and it allows for the installation of noisy equipment away from noise-sensitive areas.

[0064] 2. Multiple energy sources are connected in series and bypassed sequentially, effectively utilizing the quality of each energy source, using high-temperature energy for high-energy use and low-temperature energy for low-energy use, thereby improving energy utilization efficiency.

[0065] 3. By sequentially bypassing and connecting multiple energy sources to the heating network, the circulating flow in the network is minimized, reducing transmission energy consumption; the heating temperature is increased, the heat pump efficiency is improved, and the energy consumption on the user side is reduced, both of which can save operating costs. It can also reduce the diameter of the main pipeline, lowering the initial investment in the network.

[0066] 4. Each user can choose the connection method according to their temperature requirements: the high-temperature water supply can be directly heated or heated by heat exchange, while the low-temperature return water can be heated by the heat pump; this also better adapts to the small circulating temperature difference of the heat pump unit.

[0067] 5. During the construction period, primary energy will be constructed in phases according to the gradual increase in the service area of ​​the project, thereby reducing investment risks and avoiding waste of equipment lifespan.

[0068] 6. During system operation, one or more primary energy sources will be activated based on their characteristics and end-load requirements to fully utilize their advantages, improve overall system energy efficiency, and maintain the thermal balance and sustainable use of various primary energy sources.

[0069] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A multi-energy, multi-user clean energy heating network system, characterized in that: This includes the main circulation pipeline, which comprises both the heat source side and the user side, wherein: On the heat source side, at least two sets of clean energy heating systems are connected in series and bypassed along the circulation direction. On the user side, at least two sets of heating systems are connected in series and bypassed along the circulation direction.

2. The multi-energy, multi-user clean energy heating network system as described in claim 1, characterized in that: The clean energy heating system is at least one of buried pipe and air-cooled heat pump (3).

3. The multi-energy, multi-user clean energy heating network system as described in claim 1, characterized in that: The heating system is at least one of the following: radiator heating system (17), fan coil heating system (18), and floor heating system (19).

4. The multi-energy, multi-user clean energy heating network system as described in claim 1, characterized in that: At least two sets of clean energy heating systems are connected in series and bypassed along the circulation direction on the heat source side, arranged in order of increasing heating capacity.

5. A multi-energy, multi-user clean energy heating network system as described in claim 1, characterized in that: At least two sets of heating systems, connected in series and bypassed along the circulation direction on the heating side, are set up in order of decreasing temperature requirement.

6. The multi-energy, multi-user clean energy heating network system as described in claim 1, characterized in that: Each clean energy heating system is connected to the main circulation pipeline via a bypass loop, and each bypass loop is equipped with a separate circulating water pump.

7. A multi-energy, multi-user clean energy heating network system as described in claim 1, characterized in that: The heating system terminal is connected to the heat pump unit through a secondary pipe network, and a circulation pump is installed between the heat pump unit and the secondary pipe network; the heat pump unit is connected to the main circulation pipe through a bypass circuit, and a circulation pump is installed in the bypass circuit.

8. A multi-energy, multi-user clean energy heating network system as described in claim 1, characterized in that: The heating side is connected in series with bypasses along the circulation direction: The shallow geothermal buried pipe (1) is connected to the shallow geothermal buried pipe circulation pump (4) and the shallow geothermal buried pipe (1) input end via the inlet pipe. The shallow geothermal buried pipe (1) output end is connected to the main circulation pipe via the return pipe. The medium-deep geothermal buried pipe (2) has a bypass loop of the main circulation system connected to the medium-deep geothermal buried pipe circulation pump (5) and the input end of the medium-deep geothermal buried pipe (2) in sequence through the inlet pipe. The output end of the medium-deep geothermal buried pipe (2) is connected to the main circulation pipe through the return pipe. The air-cooled heat pump (3) has a bypass loop of the main circulation system connected to the air-cooled heat pump circulation pump (6) and the input end of the air-cooled heat pump (3) in sequence through the water inlet pipe. The output end of the air-cooled heat pump (3) is connected to the main circulation pipe through the water return pipe. The heating side is connected in series with bypasses along the circulation direction: The radiator heating system (17) has a bypass loop of the main circulation system connected in sequence to the input end of the evaporator of the distribution pump a (11) and the heat pump unit a (8) through the inlet water pipe. The output end of the evaporator of the heat pump unit a (8) is connected to the main circulation pipe through the return water pipe. The input end of the condenser of the heat pump unit a (8) is connected in sequence to the output end of the heating circulation pump a (14) and the radiator heating system (17) through the inlet water pipe. The input end of the radiator heating system (17) is connected to the output end of the condenser of the heat pump unit a (8) through the water supply pipe. The fan coil heating system (18) has a bypass loop of the main circulation system connected to the input end of the evaporator of the distribution pump b (12) and the heat pump unit b (9) in sequence through the water inlet pipe. The output end of the evaporator of the heat pump unit b (9) is connected to the main circulation pipe through the return water pipe. The input end of the condenser of the heat pump unit b (9) is connected to the output end of the heating circulation pump b (15) and the fan coil heating system (18) in sequence through the water inlet pipe. The input end of the fan coil heating system (18) is connected to the output end of the condenser of the heat pump unit b (9) through the water supply pipe. The underfloor heating system (19) has a bypass loop of the main circulation system connected in sequence to the input end of the evaporator of the distribution pump c (13) and the heat pump unit c (10) via the inlet water pipe. The output end of the evaporator of the heat pump unit c (10) is connected to the main circulation pipe via the return water pipe. The input end of the condenser of the heat pump unit c (10) is connected in sequence to the output end of the heating circulation pump c (16) and the underfloor heating system (19) via the inlet water pipe. The input end of the underfloor heating system (19) is connected to the output end of the condenser of the heat pump unit c (10) via the water supply pipe.

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