Central heating system and control method thereof

Abstract

The invention relates to the technical field of heat supply systems, and provides a centralized heat supply system and a control method thereof.The centralized heat supply system comprises a centralized heat supply module and an energy module, and the energy module comprises an air heat exchange unit, a heat storage unit, a heat pump unit, a water dividing and collecting unit, a control valve set, a green power unit and a power distribution unit; the water dividing and collecting unit is connected with the air heat exchange unit, the heat storage unit and the heat pump unit and controls connection and disconnection between any two of the air heat exchange unit, the heat storage unit and the heat pump unit, the control valve set is connected with the heat pump unit, the heat storage unit and a primary network of the centralized heating module and controls connection and disconnection between any two of the heat pump unit, the heat storage unit and the centralized heating module, and a wire of the power distribution unit is connected with the green power unit and a municipal power grid. The power distribution unit supplies power to electric components of the energy module. Therefore, the central heating system can operate in the heating mode to supplement heat to the primary network and meet the heat utilization requirement of the secondary network, and can operate the heat storage mode by using the electric power generated by the green power unit in the non-heating season to realize cross-season heat storage so as to efficiently absorb renewable electric power.

Description

Technical Field

[0001] This invention relates to the field of heating system technology, and in particular to a centralized heating system and its control method. Background Technology

[0002] In some cold-winter regions, centralized heating relies primarily on coal-fired and gas-fired boilers and combined heat and power (CHP) systems, resulting in a massive primary heating network. Simultaneously, a significant portion of electricity is generated from renewable energy sources. Under traditional CHP operation models, ensuring sufficient heat generation to meet winter heating demands inevitably leads to excessive electricity production. This excess electricity results in a large amount of renewable energy being unutilized, causing wind and solar power curtailment. Conversely, fully utilizing renewable energy requires a significant reduction in CHP power generation, consequently reducing the heat output and making it insufficient to meet winter heating needs.

[0003] Some related technologies utilize renewable energy sources to supply heat to users at the secondary heating network or user terminals. However, with the acceleration of urbanization, the space available at the user side of many users connected to centralized heating systems is often insufficient to install large-scale clean energy heating systems, and users still need to rely on centralized heating networks for heat supply.

[0004] Therefore, how to solve the problem that when the heat provided by cogeneration in related technologies is reduced or even unable to provide heat, the user's heat demand cannot be met, and the renewable energy power cannot be efficiently absorbed, has become an important technical problem that those skilled in the art need to solve. Summary of the Invention

[0005] This invention provides a centralized heating system and its control method to address the shortcomings of related technologies where user-side heating demand cannot be met when the heat provided by combined heat and power (CHP) is reduced or even unable to provide heat. At the same time, it utilizes cross-seasonal heat storage to achieve efficient year-round consumption of renewable electricity.

[0006] This invention provides a centralized heating system, comprising: A centralized heating module includes a heat exchange station and a primary network and a secondary network capable of heat exchange at the heat exchange station; The energy module includes an air heat exchange unit, a heat storage unit, a heat pump unit, a water distribution unit, a control valve assembly, a green electricity unit, and a power distribution unit. The air heat exchange unit and the heat storage unit are connected to the heat pump unit via the water distribution unit. The water distribution unit controls the connection and disconnection between any two of the air heat exchange unit, the heat storage unit, and the heat pump unit. The heat pump unit and the heat storage unit are connected to the primary grid via the control valve assembly. The control valve assembly controls the connection and disconnection between any two of the heat pump unit, the heat storage unit, and the primary grid. The green electricity unit generates electricity using renewable energy. The power distribution unit's wiring connects the green electricity unit and the municipal power grid. The power distribution unit supplies power to the electrical components of the air heat exchange unit, the heat storage unit, the heat pump unit, the water distribution unit, and the control valve assembly.

[0007] According to a centralized heating system provided by the present invention, the air heat exchange unit has an air heat exchange inlet pipe and an air heat exchange outlet pipe, the heat storage unit has a heat storage inlet pipe and a heat storage outlet pipe, and the heat pump unit has a heat source inlet pipe and a heat source outlet pipe. The water distribution unit includes: The water distribution assembly includes a water distributor, a thermal storage power pump, an air heat exchange power pump, and a main water supply valve, an air heat exchange water supply valve, a first thermal storage water supply valve, and a second thermal storage water supply valve connected to the water distributor. The main water supply valve is connected to the heat source outlet pipe, the air heat exchange water supply valve is connected to the air heat exchange inlet pipe, the first thermal storage water supply valve and the second thermal storage water supply valve are connected in parallel and are both connected to the thermal storage inlet pipe, the thermal storage power pump is located in the branch where the first thermal storage water supply valve is located, and the air heat exchange power pump is located downstream of the air heat exchange water supply valve. The water collection assembly includes a water collector and a main return water valve, an air heat exchange return water valve, and a first heat storage return water valve connected to the water collector. The main return water valve is connected to the heat source inlet pipe, the air heat exchange return water valve is connected to the air heat exchange outlet pipe, and the first heat storage return water valve is connected to the heat storage outlet pipe.

[0008] According to a centralized heating system provided by the present invention, the heat pump unit has a heating supply water pipe and a heating return water pipe. The heating supply water pipe is connected to the supply water pipe of the primary network through a heating supply water branch. The heating return water pipe is connected to the return water pipe of the primary network through a heating return water branch. The heating supply water pipe is connected to the heat storage inlet pipe through a heat storage supply water branch. The heating return water pipe is connected to the heat storage outlet pipe through a heat storage return water branch. The control valve assembly includes: A heating valve assembly includes a heating water supply valve and a heating water return valve, wherein the heating water supply valve is disposed in the heating water supply branch and the heating water return valve is disposed in the heating water return branch. The thermal storage valve assembly includes a third thermal storage water supply valve and a second thermal storage water return valve. The third thermal storage water supply valve is located in the thermal storage water supply branch, and the second thermal storage water return valve is located in the thermal storage water return branch.

[0009] According to a centralized heating system provided by the present invention, the heating water supply branch is connected to the end of the primary network's water supply pipe near the heat exchange station, and the heating return water branch is connected to the end of the primary network's return water pipe near the heat exchange station.

[0010] According to a centralized heating system provided by the present invention, the electrical energy generated by the green electricity unit comes from solar energy, wind energy, tidal energy or geothermal energy.

[0011] According to a centralized heating system provided by the present invention, the green electricity unit includes: The photovoltaic-thermal composite panel has an electrical connection part and a water flow channel. The electrical connection part is electrically connected to the power distribution unit. The water distribution component also includes a photovoltaic-thermal power pump and a photovoltaic-thermal water supply valve disposed on the water distributor. The water collection component also includes a photovoltaic-thermal water return valve. The photovoltaic-thermal water supply valve is connected to one end of the water flow channel through the photovoltaic-thermal power pump, and the photovoltaic-thermal water return valve is connected to the other end of the water flow channel.

[0012] According to a centralized heating system provided by the present invention, the heat storage unit has a heat storage temperature detection element for detecting the internal water temperature, the air heat exchange unit has an air heat exchange temperature detection element for detecting the outlet water temperature, and the green electricity unit has a solar thermal temperature detection element for detecting the outlet water temperature.

[0013] According to a centralized heating system provided by the present invention, the heat pump unit includes one or more heat pump devices, and the heat pump devices are connected in series or in parallel. The heat pump device includes a compression mechanism, a first heat exchanger, a throttling valve, and a second heat exchanger connected in sequence; or, the heat pump unit includes a compression mechanism, a four-way valve, and a first heat exchanger, a throttling valve, and a second heat exchanger connected in sequence, wherein the air intake of the compression mechanism, the air exhaust of the compression mechanism, the first heat exchanger, and the second heat exchanger are connected to the four-way valve, the heat source inlet pipe and the heat source outlet pipe correspond to the first heat exchanger, and the heating supply water pipe and the heating return water pipe correspond to the second heat exchanger; The compression mechanism includes one of a single-stage compressor, a single-stage gas-supplement compressor, a two-stage compressor, and a multi-stage compressor; or, the compression mechanism includes one of a single-stage compressor unit, a single-stage gas-supplement compressor unit, a two-stage compressor unit, a multi-stage compressor unit, and a cascade compressor unit.

[0014] This invention also provides a control method for a centralized heating system, capable of controlling the energy modules of the centralized heating system described above to operate in direct heat storage source mode, air source heat pump heating mode, heat storage source heat pump heating mode, air source natural heat storage mode, and air source mechanical heat storage mode, respectively. The control method for the centralized heating system includes: The control water distribution unit keeps any two of the air heat exchange unit, heat storage unit and heat pump unit in the off state, while the control valve group keeps only the heat storage unit connected to the primary network, so that the energy module operates in the direct supply mode of the heat storage source. The water distribution unit is controlled to only connect the air heat exchange unit and the heat pump unit, while the control valve group is controlled to only connect the heat pump unit and the primary network, so that the energy module operates in the air source heat pump heating mode. The water distribution unit is controlled to only connect the heat storage unit and the heat pump unit, while the control valve group is controlled to only connect the heat pump unit and the primary network, so that the energy module operates in the heat storage source heat pump heating mode. The water distribution unit is controlled to keep the air heat exchange unit and the heat storage unit in a connected state, while the control valve group is controlled to keep any two of the heat pump unit, the heat storage unit and the primary network in a closed state, so that the energy module operates in the air source natural heat storage mode. The water distribution unit is controlled to connect only the air heat exchange unit and the heat pump unit, while the control valve group is controlled to connect only the heat pump unit and the heat storage unit, so that the energy module operates in the air-source mechanical heat storage mode.

[0015] According to a control method for a centralized heating system provided by the present invention, the green electricity unit includes a photovoltaic-thermal composite panel, and the heat pump unit includes a four-way valve; The control method for the centralized heating system can also control the energy modules of the centralized heating system to operate in solar thermal natural heat storage mode, solar thermal mechanical heat storage mode, and cooling heat storage mode, respectively. The control method for the centralized heating system further includes: The water distribution unit is controlled to keep the water flow channels of the heat storage unit and the photovoltaic-thermal composite plate in a connected state, while the control valve group is controlled to keep any two of the heat pump unit, the heat storage unit and the primary network in a closed state, so that the energy module operates in the solar-thermal natural heat storage mode. The water distribution unit is controlled to ensure that the water flow channel of the photovoltaic-thermal composite plate is connected to the heat pump unit, and the control valve group is controlled to ensure that the heat pump unit is connected to the heat storage unit, so that the energy module operates in the photovoltaic-thermal-mechanical heat storage mode. The water distribution unit is controlled to connect only the heat storage unit and the heat pump unit, while the control valve group is controlled to connect only the heat pump unit and the primary network. The four-way valve is controlled to connect the exhaust port of the heat pump unit's compression mechanism to the first heat exchanger, so that the energy module operates in the cooling and heat storage mode.

[0016] The centralized heating system provided by this invention includes a centralized heating module and an energy module. The centralized heating module includes a heat exchange station and a primary network and a secondary network capable of heat exchange at the heat exchange station. The energy module includes an air heat exchange unit, a heat storage unit, a heat pump unit, a manifold unit, a control valve assembly, a green electricity unit, and a power distribution unit. The air heat exchange unit and the heat storage unit are connected to the heat pump unit via the manifold unit, which controls the connection and disconnection between any two of the air heat exchange unit, the heat storage unit, and the heat pump unit. By controlling the state of the manifold unit, low-grade heat energy from the air can be directly stored in the heat storage unit, or low-grade heat energy from the air or the heat energy from the heat storage unit can be upgraded to high-grade heat energy by the heat pump. The heat pump unit and the heat storage unit are connected to the primary network via the control valve assembly, which controls the connection and disconnection between any two of the heat pump unit, the heat storage unit, and the primary network. By controlling the state of the control valve group, the heat energy from the heat pump unit or the heat storage unit can be directly supplied to the primary network, or the heat energy from the heat pump unit can be stored in the heat storage unit. With this configuration, through flexible control of the manifold and control valve group, the energy modules of the centralized heating system can operate in heating mode to supplement the heat to the primary network and meet the heating needs of the secondary network. During the non-heating season, the energy modules of the centralized heating system can also utilize electricity generated by the green electricity unit during the non-heating season to operate in heat storage mode, storing heat in the heat storage unit to supplement the heat energy consumed in winter and prepare for the next heating season, achieving cross-seasonal energy storage. When the heat provided by the primary network decreases or even cannot be provided, the energy modules operate in heating mode to supplement the heat to the primary network and meet the heating needs of the secondary network. When the cogeneration system is the primary network, the centralized heating system provided by this invention effectively solves the problem in related technologies where the heating needs of users cannot be met when the heat provided by the cogeneration system decreases or even cannot be provided.

[0017] The green electricity unit generates electricity using renewable energy. The power distribution unit's wiring connects the green electricity unit to the municipal power grid, supplying power to the electrical components of the air heat exchange unit, thermal storage unit, heat pump unit, water distribution unit, and control valve assembly. The energy module can use the clean electricity generated by the green electricity unit and can consume the generated green electricity locally, providing power for the operation of the energy module. This effectively utilizes renewable energy that might otherwise be wasted, converting it into heat energy for heating or storage, improving the utilization rate of renewable energy and reducing energy waste. The centralized heating system provided by this invention also achieves efficient consumption of renewable electricity throughout the year. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the centralized heating system provided by the present invention. Figure 1 .

[0020] Figure 2 yes Figure 1 A schematic diagram of the structure of the water distribution unit in the centralized heating system.

[0021] Figure 3 This is a schematic diagram of the centralized heating system provided by the present invention. Figure 2 .

[0022] Figure 4 yes Figure 3 A schematic diagram of the structure of the water distribution unit in the centralized heating system.

[0023] Figure 5 This is a schematic diagram of the centralized heating system provided by the present invention when only the centralized heating module is running.

[0024] Figure 6 This is a schematic diagram of the centralized heating system provided by the present invention operating in the direct supply mode of the heat storage source.

[0025] Figure 7 This is a schematic diagram of the centralized heating system provided by the present invention operating in air source heat pump heating mode.

[0026] Figure 8 This is a schematic diagram of the centralized heating system provided by the present invention operating in the heat storage source heat pump heating mode.

[0027] Figure 9 This is a schematic diagram of the centralized heating system provided by the present invention operating in the air source natural heat storage mode.

[0028] Figure 10 This is a schematic diagram of the centralized heating system provided by the present invention operating in air-source mechanical heat storage mode.

[0029] Figure 11 This is a schematic diagram of the centralized heating system provided by the present invention operating in the solar thermal natural heat storage mode.

[0030] Figure 12 This is a schematic diagram of the centralized heating system provided by the present invention operating in the solar thermal mechanical heat storage mode.

[0031] Figure 13 This is a schematic diagram of the centralized heating system provided by the present invention operating in cooling and heat storage mode.

[0032] Figure label: 1. Primary network; 11. Primary network heat source; 12. Primary network power pump; 13. Primary network water supply pipe; 14. Primary network return pipe; 15. Primary network water supply valve; 16. Primary network return valve; 2. Secondary network; 21. Urban heating load area; 22. Secondary network power pump; 23. Secondary network water supply pipe; 24. Secondary network return pipe; 3. Heat exchange station; 4. Heating valve assembly; 41. Heating return valve; 42. Heating supply... 43. Water valve; 44. Heating supply water branch; 5. Heating return water branch; 6. Heat pump unit; 51. Compression mechanism; 52. First heat exchanger; 53. Throttling valve; 54. Second heat exchanger; 55. Heat source side power pump; 56. Heating side power pump; 57. Four-way valve; 6. Water distribution and manifold unit; 601. Water collector; 602. Water distributor; 603. Air heat exchange return water valve; 604. First heat storage return water valve; 605. 606. Air heat exchange water supply valve; 607. First thermal storage water supply valve; 608. Second thermal storage water supply valve; 609. Air heat exchange power pump; 611. Thermal storage power pump; 612. Main return water valve; 613. Main supply water valve; 614. Photothermal return water valve; 615. Photothermal supply water valve; 616. Photothermal power pump; 7. Air heat exchange unit; 72. Heat exchange packing; 73. Air heat exchange inlet pipe; 74. Air heat exchange outlet pipe 8. Thermal storage unit; 81. Thermal storage container; 82. Thermal storage outlet pipe; 83. Thermal storage inlet pipe; 84. Thermal storage power pump; 9. Thermal storage valve assembly; 91. Thermal storage water supply branch; 92. Third thermal storage water supply valve; 93. Thermal storage return water branch; 94. Second thermal storage return water valve; 100. Municipal power grid; 101. Power distribution unit; 102. Green electricity unit; 00. Energy module; 01. Photovoltaic thermal composite panel. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0034] The following is combined with Figures 1 to 13 The present invention describes a centralized heating system.

[0035] like Figures 1 to 13 As shown, the centralized heating system provided in this embodiment of the invention includes a centralized heating module and an energy module 00.

[0036] Specifically, the centralized heating module includes a heat exchange station 3, a primary network 1, and a secondary network 2. The primary network 1 and secondary network 2 can exchange heat at the heat exchange station 3. The primary network 1 includes a primary network heat source 11, a primary network power pump 12, a primary network water supply pipe 13, a primary network return water pipe 14, a primary network water supply valve 15, and a primary network return water valve 16, as shown in the reference. Figure 1 and Figure 2 Secondary network 2 includes urban heat load zone 21, secondary network water supply pipe 23, secondary network return water pipe 24, and secondary network power pump 22. Primary network heat source 11 may be, but is not limited to, a combined heat and power system. Heat exchange station 3 includes heat exchangers.

[0037] The energy module 00 includes an air heat exchange unit 7, a heat storage unit 8, a heat pump unit 5, a water distribution unit 6, a control valve group, a green electricity unit 102, and a power distribution unit 101.

[0038] Air heat exchange unit 7 and heat storage unit 8 are connected to heat pump unit 5 via water distribution unit 6. Water distribution unit 6 is used to control the connection and disconnection between any two of the air heat exchange unit 7, heat storage unit 8, and heat pump unit 5. By controlling the state of water distribution unit 6, low-grade heat energy in the air can be directly stored in heat storage unit 8, or low-grade heat energy in the air or heat energy in heat storage unit 8 can be upgraded to high-grade heat energy by the heat pump.

[0039] Heat pump unit 5 and heat storage unit 8 are connected to primary network 1 via a control valve assembly. The control valve assembly is used to control the connection and disconnection between any two of the heat pump unit 5, heat storage unit 8, and primary network 1. By controlling the state of the control valve assembly, the heat energy of heat pump unit 5 or heat storage unit 8 can be directly supplied to primary network 1, or the heat energy of heat pump unit 5 can be stored in heat storage unit 8.

[0040] Specifically, the water distribution unit 6 can be controlled to shut off any two of the air heat exchange unit 7, the heat storage unit 8, and the heat pump unit 5, while the control valve group can be controlled to keep only the heat storage unit 8 connected to the primary network 1. At this time, water circulates between the heat storage unit 8 and the primary network 1, allowing the heat from the heat storage unit 8 to be directly transferred to the primary network 1, which is called the direct supply mode of the heat storage source.

[0041] The water distribution unit 6 can be controlled to connect only the air heat exchange unit 7 and the heat pump unit 5, while the control valve group can be controlled to connect only the heat pump unit 5 and the primary network 1. In this case, the heat pump unit 5 converts the low-grade heat energy from the air heat exchange unit 7 into high-grade heat energy and delivers it to the primary network 1, which is called the air source heat pump heating mode.

[0042] The water distribution unit 6 can be controlled to connect only the heat storage unit 8 and the heat pump unit 5, while the control valve group can be controlled to connect only the heat pump unit 5 and the primary network 1. In this case, the heat pump unit 5 converts the low-grade heat energy of the heat storage unit 8 into high-grade heat energy and delivers it to the primary network 1, which is called the heat storage source heat pump heating mode.

[0043] The water distribution unit 6 can be controlled to keep only the air heat exchange unit 7 and the heat storage unit 8 in a connected state, while the control valve group can be controlled to keep any two of the heat pump unit 5, the heat storage unit 8, and the primary network 1 in a closed state. At this time, water circulates between the air heat exchange unit 7 and the heat storage unit 8, which can store the heat of the air heat exchange unit 7 in the heat storage unit 8. This is called the air source natural heat storage mode.

[0044] The water distribution unit 6 can be controlled to connect only the air heat exchange unit 7 and the heat pump unit 5, while the control valve group can be controlled to connect only the heat pump unit 5 and the heat storage unit 8. In this case, the heat pump unit 5 converts the low-grade heat energy of the air heat exchange unit 7 into high-grade heat energy, and transports and stores it in the heat storage unit 8. This is called the air-source mechanical heat storage mode.

[0045] This configuration, through flexible control of the water distribution unit 6 and the control valve group, allows the energy module 00 of the centralized heating system to operate in heating mode, supplementing the primary network 1 with heat to meet the heating needs of the secondary network 2. During the non-heating season, the energy module 00 can also utilize the electricity generated by the green electricity unit 102 to operate in heat storage mode, storing heat in the heat storage unit 8 to replenish the heat energy consumed in winter and prepare for the next heating season, achieving cross-seasonal energy storage. When the heat provided by the primary network 1 decreases or even becomes unavailable, the energy module 00 operates in heating mode to supplement the primary network 1 with heat to meet the heating needs of the secondary network 2. When the cogeneration system is the primary network 1, the centralized heating system provided by this embodiment effectively solves the problem in related technologies where the heating needs of users cannot be met when the heat provided by the cogeneration system decreases or becomes unavailable.

[0046] Furthermore, when the heating demand of secondary network 2 decreases or even disappears, energy module 00 can operate to store heat. This allows the heat to be released to primary network 1 when the heating demand of secondary network 2 is high and primary network 1 cannot provide sufficient heat.

[0047] The green power unit 102 generates electricity using renewable energy. The power distribution unit 101 is connected to the green power unit 102 and the municipal power grid 100 by wires. The power distribution unit 101 is used to supply power to the electrical components of the air heat exchange unit 7, the heat storage unit 8, the heat pump unit 5, the water distribution unit 6, and the control valve group.

[0048] Energy module 00 can use the clean electricity generated by green electricity unit 102 and can consume the generated green electricity locally to provide power for the operation of energy module 00. It effectively utilizes renewable energy that might otherwise be abandoned, converting it into heat energy for heating or storage, thereby improving the utilization rate of renewable energy and reducing energy waste. The centralized heating system provided in this embodiment of the invention also achieves efficient consumption of renewable electricity throughout the year.

[0049] Specifically, the energy module 00 can prioritize the use of clean electricity generated by the green electricity unit 102, thereby reducing the system's operating costs and carbon emissions. When green electricity is insufficient, it can be supplemented by the municipal power grid 100, ensuring the stability and reliability of the entire centralized heating system and realizing flexible coupling and intelligent scheduling of multiple energy sources.

[0050] In this embodiment of the invention, the air heat exchange unit 7 has a heat exchange packing 72, an air heat exchange water inlet pipe 73 and an air heat exchange water outlet pipe 74. The air heat exchange water inlet pipe 73 and the air heat exchange water outlet pipe 74 can supply water for circulation. When the water passes through the heat exchange packing 72, it can exchange heat with the air to transfer the heat in the air to the water.

[0051] The heat storage unit 8 includes a heat storage container 81, a heat storage inlet pipe 83, and a heat storage outlet pipe 82. The heat storage container 81 can be, but is not limited to, a buried pipe or a hot water storage pit. The heat storage inlet pipe 83 and the heat storage outlet pipe 82 can circulate water. If the temperature at the location where the heat storage inlet pipe 83 and the heat storage outlet pipe 82 are connected is higher than the temperature inside the heat storage container 81, heat is transferred into the heat storage container 81, achieving heat storage. If the temperature at the location where the heat storage inlet pipe 83 and the heat storage outlet pipe 82 are connected is lower than the temperature inside the heat storage container 81, heat is released from the heat storage container 81 to the outside, achieving heat release.

[0052] The heat pump unit 5 has a heat source inlet pipe and a heat source outlet pipe, which can supply water circulation to supply low-grade heat energy to the heat pump unit 5.

[0053] The water distribution unit 6 includes a water distribution component and a water collection component.

[0054] The water distribution assembly includes a water distributor 602, a thermal storage power pump 609, an air heat exchange power pump 608, and a main water supply valve 612, an air heat exchange water supply valve 605, a first thermal storage water supply valve 606, and a second thermal storage water supply valve 607 connected to the water distributor 602. The main water supply valve 612 is connected to the heat source outlet pipe, the air heat exchange water supply valve 605 is connected to the air heat exchange inlet pipe 73, and the first thermal storage water supply valve 606 and the second thermal storage water supply valve 607 are connected in parallel and are both connected to the thermal storage inlet pipe 83.

[0055] By controlling the opening and closing states of the main water supply valve 612, the air heat exchange water supply valve 605, the first heat storage water supply valve 606, and the second heat storage water supply valve 607, the connection and disconnection between the heat source outlet pipe, the air heat exchange inlet pipe 73, and the heat storage inlet pipe 83 can be controlled.

[0056] A thermal storage power pump 609 is located in the branch where the first thermal storage water supply valve 606 is located, and the thermal storage power pump 609 can provide power for the water flowing to the thermal storage unit 8. An air heat exchange power pump 608 is located downstream of the air heat exchange water supply valve 605, and the air heat exchange power pump 608 can provide power for the water flowing to the air heat exchange unit 7.

[0057] The water collection assembly includes a water collector 601 and a main return water valve 611, an air heat exchange return water valve 603, and a first heat storage return water valve 604 connected to the water collector 601. The main return water valve 611 is connected to the heat source inlet pipe, the air heat exchange return water valve 603 is connected to the air heat exchange outlet pipe 74, and the first heat storage return water valve 604 is connected to the heat storage outlet pipe 82.

[0058] By controlling the opening and closing states of the main return water valve 611, the air heat exchange return water valve 603, and the first heat storage return water valve 604, the connection and disconnection between the heat source inlet pipe, the air heat exchange outlet pipe 74, and the heat storage outlet pipe 82 can be controlled.

[0059] By combining the coordinated control of the valves in the water distribution and collection components, the connection and disconnection of the air heat exchange unit 7, the heat storage unit 8, and the heat pump unit 5 can be flexibly controlled.

[0060] In a further embodiment, the heat pump unit 5 has a heating supply water pipe and a heating return water pipe. The heating supply water pipe is connected to the supply water pipe of the primary network 1 through a heating supply water branch 43, and the heating return water pipe is connected to the return water pipe of the primary network 1 through a heating return water branch 44. In this way, a fluid passage is constructed for the heat pump unit 5 to directly supply heat to the primary network 1.

[0061] The heating water supply pipe is connected to the heat storage inlet pipe 83 via the heat storage water supply branch 91, and the heating return water pipe is connected to the heat storage outlet pipe 82 via the heat storage return water branch 93. This establishes a fluid pathway for heat pump unit 5 to store heat in heat storage unit 8. A heat storage power pump 84 is installed on the heat storage outlet pipe 82, and the connection point between the first heat storage return water valve 604 and the heat storage outlet pipe 82 is located on the side of the heat storage power pump 84 closest to the heat storage container 81.

[0062] The heating supply water branch 43 and the heating return water branch 44 are collectively referred to as the heating pipeline, and the heat storage supply water branch 91 and the heat storage return water branch 93 are collectively referred to as the heat storage pipeline. The heating pipeline and the heat storage pipeline are connected in parallel, so that the heat pump unit 5 has both direct heating and heat storage functions.

[0063] The control valve assembly includes a heating valve assembly 4 and a heat storage valve assembly 9.

[0064] The heating valve assembly 4 includes a heating water supply valve 42 and a heating water return valve 41. The heating water supply valve 42 is located in the heating water supply branch 43, and the heating water return valve 41 is located in the heating water return branch 44. By synchronously opening or closing the heating water supply valve 42 and the heating water return valve 41, the thermal circulation between the heat pump unit 5 and the primary network 1 can be easily connected or disconnected, thereby realizing the start and stop control of the heating function of the primary network 1. The operation is simple and the control is precise.

[0065] The thermal storage valve assembly 9 includes a third thermal storage water supply valve 92 and a second thermal storage water return valve 94. The third thermal storage water supply valve 92 is located in the thermal storage water supply branch 91, and the second thermal storage water return valve 94 is located in the thermal storage water return branch 93. By synchronously opening or closing the third thermal storage water supply valve 92 and the second thermal storage water return valve 94, the thermal circulation between the heat pump unit 5 and the thermal storage unit 8 can be easily connected or disconnected, thereby controlling whether the energy module 00 performs mechanical thermal storage.

[0066] It should be noted that both the heating water supply branch 43 and the thermal storage water supply branch 91 are connected to the heating water supply pipe, and both the heating return water branch 44 and the thermal storage return water branch 93 are connected to the heating return water pipe. In fact, the heating water supply branch 43 and the thermal storage water supply branch 91 are connected, and the heating return water branch 44 and the thermal storage return water branch 93 are also connected. The heat from the thermal storage unit 8 can be transported to the primary network 1 through the heating pipeline. By opening or closing the aforementioned heating valve assembly 4 and thermal storage valve assembly 9, the thermal circulation between the thermal storage unit 8 and the primary network 1 can be easily connected or disconnected.

[0067] By coordinating the control of each valve in the water distribution unit 6 and the valves in the control valve group, the energy module 00 can be precisely switched between direct heating mode and thermal storage mode, ensuring the reliability of the system to work on demand.

[0068] In this embodiment of the invention, the heating and water supply branch 43 is connected to the end of the water supply pipe of the primary network 1 near the heat exchange station 3, so that the high-temperature hot water generated by the energy module 00 is directly supplied to the inlet of the heat exchange station 3. This can quickly and effectively replenish the water supply at the end of the primary network water supply pipe 13, thereby compensating for the heat loss and pressure loss of the primary network 1 during long-distance transportation, ensuring that the water temperature entering the heat exchange station 3 always meets the heating needs of the secondary network 2, and significantly improving the heating quality and system stability for end users.

[0069] The heating return water branch 44 is connected to the end of the return water pipe of the primary network 1 near the heat exchange station 3. The return water with the lowest temperature after heat exchange at the heat exchange station 3 serves as the water source to be heated for the energy module 00. Together with the heating supply water branch 43, it forms a compact and efficient local heat circulation supplement loop for the heat exchange station 3. This makes the heat supplementation point more precise, the response speed to load changes faster, and minimizes the disturbance to the hydraulic conditions of the main pipeline of the primary network 1, thereby improving the operating efficiency of the energy module 00 and the control flexibility of the entire heating system.

[0070] Energy Module 00 does not occupy land in the central city and is generally located in the suburbs. It aims to utilize the distributed renewable energy in the area to supply heat to the primary grid system, acting as a distributed energy station. At the same time, this type of energy station can be flexibly deployed closer to heat users and can be set up in multiple locations, which helps to reduce the loss and power consumption of hot water during long-distance transportation.

[0071] In this embodiment, the electrical energy generated by the green power unit 102 can be, but is not limited to, solar energy, wind energy, tidal energy, or geothermal energy.

[0072] In this embodiment, the green electricity unit 102 includes a photovoltaic-thermal composite plate 01, which realizes the integration of photovoltaic and solar thermal power, and can recover heat while generating electricity, greatly improving the comprehensive utilization efficiency of solar energy.

[0073] The photovoltaic-thermal composite panel 01 has an electrical connection part and a water flow channel. The electrical connection part is electrically connected to the power distribution unit 101. Photovoltaic power generation can supply power to various electrical components of the energy module 00, effectively reducing the dependence of the energy module 00 on the municipal power grid 100 and the operating cost, and improving the energy self-sufficiency rate of the energy module 00.

[0074] The water distribution assembly also includes a solar thermal power pump 615 and a solar thermal water supply valve 614 installed in the water distributor 602. The water collection assembly also includes a solar thermal return valve 613. The solar thermal water supply valve 614 is connected to one end of the water flow channel through the solar thermal power pump 615, and the solar thermal return valve 613 is connected to the other end of the water flow channel. This constitutes a complete and controllable solar thermal circulation loop. The solar thermal power pump 615 provides circulation power, and the solar thermal water supply valve 614 and solar thermal return valve 613 control the on / off state. This realizes the active collection and flexible scheduling of solar thermal resources, which facilitates the efficient transfer of collected solar heat to the heat storage unit 8 for storage or direct supply to the heat pump unit 5, thereby enhancing the system's ability to utilize renewable energy and the diversity of its operating modes.

[0075] At this time, the energy module 00 of the centralized heating system can also operate in solar thermal natural heat storage mode and solar thermal mechanical heat storage mode.

[0076] Specifically, the water distribution unit 6 can be controlled to keep only the water flow channels of the heat storage unit 8 and the photovoltaic-thermal composite panel 01 connected, while the control valve group can be controlled to keep any two of the heat pump unit 5, the heat storage unit 8, and the primary network 1 in a closed state. At this time, water circulates between the water flow channels of the photovoltaic-thermal composite panel 01 and the heat storage unit 8, which can store solar heat in the heat storage unit 8, and is called the solar thermal natural heat storage mode.

[0077] The water distribution unit 6 can be controlled to ensure that only the water flow channel of the photovoltaic-thermal composite panel 01 is connected to the heat pump unit 5, while the control valve group can be controlled to ensure that only the heat pump unit 5 is connected to the heat storage unit 8. At this time, the heat pump unit 5 converts solar heat into high-grade thermal energy and stores it in the heat storage unit 8, which is called the solar-thermal-mechanical heat storage mode.

[0078] The medium in the water flow channel of the aforementioned photovoltaic-thermal composite plate 01 is selected from organic or inorganic solutions with low freezing points.

[0079] In this embodiment of the invention, the heat storage unit 8 has a heat storage temperature detection element for detecting the water temperature inside the heat storage unit 8, so as to monitor the heat storage status and temperature inside the heat storage unit 8 in real time, providing accurate data basis for intelligent switching between different operating modes of the energy module 00, ensuring efficient and rational use of energy, and avoiding ineffective or inefficient energy scheduling.

[0080] The air heat exchange unit 7 has an air heat exchange temperature detection element to detect the outlet water temperature of the air heat exchange unit 7. It can provide real-time feedback on the effect of absorbing heat from the ambient air, helping the control system to determine whether the currently acquired low-grade heat energy is sufficient for direct storage or whether it is necessary to start the heat pump unit 5 to raise the temperature. It is the key to achieving efficient switching between natural heat storage and mechanical heat storage modes of air energy, thereby significantly improving the energy utilization efficiency of the system under different ambient temperatures.

[0081] The green electricity unit 102 has a solar thermal temperature detection element to detect the outlet water temperature of the green electricity unit 102, so that the control system can accurately grasp the instantaneous heat generation of solar energy. This is the key to realizing the efficient switching between solar thermal natural heat storage and mechanical heat storage modes, thereby maximizing the utilization of green electricity and solar thermal resources and improving the clean energy utilization rate and operating economy of the entire system.

[0082] Temperature sensors can be selected from the above-mentioned heat storage temperature detection element, air heat exchange temperature detection element, and photothermal temperature detection element.

[0083] Meanwhile, the valves in this embodiment are set as electric valves, and each temperature sensor, each valve, each power pump, and the compression mechanism 51 are electrically connected to the control system to realize automated control of the energy module 00.

[0084] In some embodiments of the present invention, the heat pump unit 5 includes one or more heat pump devices. When the heat pump unit 5 includes multiple heat pump devices, the heat pump devices can be connected in series or in parallel.

[0085] The heat pump device includes a compression mechanism 51, a first heat exchanger 52, a throttling valve 53, and a second heat exchanger 54 connected in sequence. During operation of the compression mechanism 51, the first heat exchanger 52 acts as an evaporator, and the second heat exchanger 54 acts as a condenser.

[0086] In other embodiments of the present invention, the heat pump device includes a compression mechanism 51, a four-way valve 57, and a first heat exchanger 52, a throttling valve 53, and a second heat exchanger 54 connected in sequence. The suction port and exhaust port of the compression mechanism 51, the first heat exchanger 52, and the second heat exchanger 54 are connected to the four-way valve 57. By switching the state of the four-way valve 57, the first heat exchanger 52 can be used as an evaporator and the second heat exchanger 54 can be used as a condenser; alternatively, the first heat exchanger 52 can be used as a condenser and the second heat exchanger 54 can be used as an evaporator.

[0087] The heat source inlet pipe and heat source outlet pipe correspond to the first heat exchanger 52, and the heating supply water pipe and heating return water pipe correspond to the second heat exchanger 54.

[0088] When the first heat exchanger 52 acts as an evaporator and the second heat exchanger 54 acts as a condenser, it can absorb the heat output from the air heat exchange unit 7 and the heat storage unit 8, and release the heat to the primary network 1 or the heat storage unit 8. When the energy module 00 operates in the direct heat storage source supply mode, air source heat pump heating mode, heat storage source heat pump heating mode, air source natural heat storage mode, air source mechanical heat storage mode, solar thermal natural heat storage mode, and solar thermal mechanical heat storage mode, the first heat exchanger 52 acts as an evaporator and the second heat exchanger 54 acts as a condenser.

[0089] When the first heat exchanger 52 functions as a condenser and the second heat exchanger 54 functions as an evaporator, the water distribution unit 6 is controlled to connect only the water storage unit and the heat pump unit 5, and the control valve group is controlled to connect only the heat pump unit 5 and the primary network 1. In this mode, cooling capacity can be supplied to the primary network 1, and the heat from the primary network 1 can be stored in the heat storage unit 8; this is called the cooling-storage mode. It can produce chilled water at temperatures ranging from 16°C to 20°C.

[0090] In a specific embodiment, the compression mechanism 51 includes one of a single-stage compressor, a single-stage gas-supplement compressor, a two-stage compressor, and a multi-stage compressor; or, the compression mechanism 51 includes one of a single-stage compressor group, a single-stage gas-supplement compressor group, a two-stage compressor group, a multi-stage compressor group, and a cascade compressor group.

[0091] By adopting single-stage compressors, two-stage compressors, multi-stage compressors, or cascade compressor units, it is possible to effectively cope with the low outdoor ambient temperature, improve the heating performance and operational stability of the heat pump in frigid climates, and ensure that when the heat supply of the primary network 1 is insufficient, the energy module 00 can stably and efficiently generate enough high-grade heat energy to supplement the primary network 1, thus guaranteeing the user's heating needs.

[0092] The heat pump device also includes a heat source-side power pump 55 and a heating-side power pump 56. The heat source-side power pump 55 is installed in the heat source inlet pipe, and the heating-side power pump 56 is installed in the heating return pipe.

[0093] In some embodiments, valves may be installed on the heating water supply pipe and the heating water return pipe respectively to control the on / off state of the heating water supply pipe and the heating water return pipe.

[0094] The aforementioned power pumps are all selected as variable frequency pumps to improve the system energy efficiency ratio under partial load.

[0095] In summary, the centralized heating system in this embodiment of the invention retains the original centralized heating module, adds an energy module 00 to the primary network 1, and uses geothermal energy, solar energy, air energy and other renewable energy sources as heat sources according to the characteristics of renewable energy in different regions. The heat pump unit 5 is used to raise the temperature of these low-temperature heat sources to the temperature level required by the primary network, and then transports them to the primary network 1.

[0096] Furthermore, the green electricity unit 102 is used as the power source for the centralized heating system, supplying power to all electrical components of the system, thereby reducing the cost of heat source production and carbon emissions. Simultaneously, during the non-heating season, the higher-temperature heat source stored in the heat storage unit 8 is used to provide higher-temperature heat energy during the peak winter heating season when heating loads are high. To ensure efficient production of the required temperature heat source, during the non-heating season, the energy module 00 utilizes the heat pump unit 5 to absorb green electricity, storing low-grade heat sources in stages in the heat storage unit 8, achieving efficient cross-seasonal heat storage. This ensures that the low-grade heat source in the heat pump unit 5 has sufficient temperature in winter, improving the efficiency of the heat pump unit 5 and thus reducing the installed capacity of the energy module 00 and the capacity of wind and solar power generation facilities.

[0097] The centralized heating system in this embodiment of the invention addresses the issue of reduced or nonexistent heat supply to the heating network from combined heat and power (CHP) under the new power system. It utilizes cross-seasonal heat storage and renewable energy, combined with the efficient absorption of surplus green electricity, to provide high-temperature heat to the heating network. In the early stages of winter heating, heat storage units 8 can directly supply heat to the primary network. In the early and late stages of heating, air heat sources and heat pump units 5 can be used to extract heat into the primary network, reducing or compensating for the heat extraction by heat storage units 8. In the middle of the heating season, heat is extracted from the cross-seasonal heat storage units 8, upgraded by the heat pump unit 5, and then transported to the primary network. During the transitional season or in summer, heat is supplied to the heat storage units 8 through various tiered methods to ensure seasonal thermal balance of the heat storage modules, while also meeting some summer cooling needs.

[0098] On the other hand, the present invention also provides a control method for a centralized heating system based on any of the above embodiments. The control method for the centralized heating system described below can be referred to in correspondence with the centralized heating system described above.

[0099] The control method for the centralized heating system provided in this embodiment of the invention can control the energy module 00 of the centralized heating system provided in any of the above embodiments to operate in the direct supply mode of heat storage source, the air source heat pump heating mode, the heat storage source heat pump heating mode, the air source natural heat storage mode, and the air source mechanical heat storage mode.

[0100] The control method for a centralized heating system provided in this embodiment of the invention includes the following steps.

[0101] The control water distribution unit 6 keeps any two of the air heat exchange unit 7, heat storage unit 8 and heat pump unit 5 in the off state, while the control valve group keeps only the heat storage unit 8 connected to the primary network 1, so that the energy module 00 operates in the direct heat storage source supply mode.

[0102] The control water distribution unit 6 keeps the air heat exchange unit 7 and the heat pump unit 5 connected, and at the same time controls the control valve group to keep the heat pump unit 5 connected to the primary network 1, so that the energy module 00 operates in the air source heat pump heating mode.

[0103] The control water distribution unit 6 keeps the heat storage unit 8 and the heat pump unit 5 connected, and at the same time controls the control valve group to keep the heat pump unit 5 connected to the primary network 1, so that the energy module 00 operates in the heat storage source heat pump heating mode.

[0104] The control water distribution unit 6 keeps the air heat exchange unit 7 and the heat storage unit 8 in a connected state, while the control valve group keeps any two of the heat pump unit 5, the heat storage unit 8 and the primary network 1 in a cut-off state, so that the energy module 00 operates in the air source natural heat storage mode.

[0105] The control water distribution unit 6 keeps the air heat exchange unit 7 and the heat pump unit 5 connected, and at the same time, the control valve group keeps the heat pump unit 5 and the heat storage unit 8 connected, so that the energy module 00 operates in the air source mechanical heat storage mode.

[0106] By controlling the connection and disconnection between any two of the air heat exchange unit 7, heat storage unit 8, and heat pump unit 5, and by controlling the connection and disconnection between any two of the heat pump unit 5, heat storage unit 8, and primary network 1, the energy module 00 of the centralized heating system can operate in different heating and heat storage modes. When the heat provided by the primary network 1 decreases or even becomes unavailable, the energy module 00 operates in heating mode to supplement the heat to the primary network 1 and meet the heating needs of the secondary network 2. When the cogeneration system is the primary network 1, the centralized heating system provided by this invention effectively solves the problem in related technologies where the heating needs of users cannot be met when the heat provided by the cogeneration system decreases or becomes unavailable.

[0107] The derivation process of the beneficial effects of the control method of the centralized heating system in the embodiments of the present invention is largely similar to the derivation process of the beneficial effects of the centralized heating system described above, so it will not be repeated here.

[0108] When the green power unit 102 includes a photovoltaic-thermal composite panel 01, the control method of the centralized heating system provided in this embodiment of the invention can also control the energy module 00 of the centralized heating system to operate in the solar-thermal natural heat storage mode and the solar-thermal mechanical heat storage mode, respectively.

[0109] Specifically, the control method for centralized heating systems also includes the following steps.

[0110] The control water distribution unit 6 keeps the water flow channels of the heat storage unit 8 and the photovoltaic-thermal composite plate 01 connected, while the control valve group keeps any two of the heat pump unit 5, the heat storage unit 8 and the primary network 1 in a closed state, so that the energy module 00 operates in the solar thermal natural heat storage mode.

[0111] The control water distribution unit 6 keeps the water flow channel of the photovoltaic-thermal composite plate 01 connected to the heat pump unit 5, and at the same time controls the control valve group to keep the heat pump unit 5 connected to the heat storage unit 8, so that the energy module 00 operates in the photovoltaic-thermal-mechanical heat storage mode.

[0112] When the heat pump unit 5 includes a four-way valve 57, the control method of the centralized heating system provided in this embodiment of the invention can also control the energy module 00 of the centralized heating system to operate in the cooling and heat storage mode.

[0113] Specifically, the control method for centralized heating systems also includes the following steps.

[0114] The control water distribution unit 6 keeps the heat storage unit 8 and the heat pump unit 5 connected, while the control valve group keeps the heat pump unit 5 connected to the primary network 1. The control four-way valve 57 connects the exhaust port of the compression mechanism 51 of the heat pump unit 5 to the first heat exchanger 52, so that the energy module 00 operates in the cooling and heat storage mode.

[0115] The process of switching the operating mode of the energy module 00 mentioned above requires combining the detection data of the heat storage temperature detection element, the air heat exchange temperature detection element and the photothermal temperature detection element, as well as the external ambient temperature data, to control the status of each valve, each power pump and the compression mechanism 51.

[0116] When heating is required for secondary network 2: When the water temperature inside the heat storage unit 8 meets the water supply temperature requirements of primary network 1, the energy module 00 operates in direct heat storage source mode. When the outlet water temperature of the air heat exchange unit 7 is higher than the preset temperature on the heat source side of the heat pump unit 5, the energy module 00 operates in air source heat pump heating mode. When the ambient temperature is low, the outlet water temperature of the air heat exchange unit 7 is lower than the preset temperature on the heat source side of the heat pump unit 5, and the direct heat storage source mode has already been run, the water temperature of the heat storage unit 8 is low, and direct heating cannot meet the requirements. However, if the water temperature of the heat storage unit 8 is higher than the preset temperature on the heat source side of the heat pump unit 5, the energy module 00 operates in heat storage source heat pump heating mode.

[0117] When heating is not required for secondary network 2: When the internal water temperature of heat storage unit 8 is low and the outlet water temperature of air heat exchange unit 7 is higher than the internal water temperature of heat storage unit 8, energy module 00 operates in air-source natural heat storage mode. When the outlet water temperature of air heat exchange unit 7 is lower than the internal water temperature of heat storage unit 8, energy module 00 operates in air-source mechanical heat storage mode. When the outlet water temperature of green electricity unit 102 is higher than the internal water temperature of heat storage unit 8, energy module 00 operates in solar thermal natural heat storage mode. When the outlet water temperature of green electricity unit 102 is lower than the internal water temperature of heat storage unit 8, energy module 00 operates in solar thermal mechanical heat storage mode.

[0118] The following details the status of each valve, each power pump, and the compression mechanism 51 under various operating modes of the energy module 00.

[0119] Direct supply mode of heat storage source: refer to Figure 6 Only the thermal storage power pump 84 is operating, and only the heating water supply valve 42, heating water return valve 41, the third thermal storage water supply valve 92, and the second thermal storage water return valve 94 are in the open state. The remaining valves of the energy module 00 are in the closed state, and the remaining power pumps and compressor mechanism 51 of the energy module 00 are stopped. The direct supply mode of the thermal storage source generally operates at the beginning of the heating season.

[0120] Air source heat pump heating mode: Refer to Figure 7 In this mode, only the air heat exchange power pump 608, the heat source side power pump 55, the heating side power pump 56, and the compression mechanism 51 operate. Simultaneously, only the main water supply valve 612, the air heat exchange water supply valve 605, the air heat exchange return water valve 603, the main return water valve 611, the heating water supply valve 42, and the heating return water valve 41 are open. The first heat exchanger 52 acts as an evaporator, and the second heat exchanger 54 acts as a condenser. The remaining valves of the energy module 00 are closed, and the remaining power pumps of the energy module 00 cease operation. In this mode, the centralized heating module operates. The air source heat pump heating mode typically operates in the middle of the heating season when the ambient temperature is low.

[0121] Thermal storage heat pump heating mode: Refer to Figure 8 In this mode, only the thermal storage power pump 609, the heat source-side power pump 55, the heating-side power pump 56, and the compression mechanism 51 operate. Simultaneously, only the main water supply valve 612, the first thermal storage water supply valve 606, the first thermal storage return water valve 604, the main return water valve 611, the heating water supply valve 42, and the heating return water valve 41 are open. The first heat exchanger 52 acts as an evaporator, and the second heat exchanger 54 acts as a condenser. The remaining valves of the energy module 00 are closed, and the remaining power pumps of the energy module 00 cease operation. In this mode, the centralized heating module operates. The air source heat pump heating mode generally operates in the middle of the heating season when the ambient temperature is low.

[0122] Air source heat pump natural heat storage mode: refer to Figure 9 Only the air heat exchange power pump 608 is operating, and only the air heat exchange water supply valve 605, air heat exchange water return valve 603, first heat storage water return valve 604, and second heat storage water supply valve 607 are in the open state. The remaining valves of the energy module 00 are in the closed state, and the remaining power pumps and compressor mechanism 51 of the energy module 00 are stopped.

[0123] Air source heat pump mechanical heat storage mode: refer to Figure 10 Only the air heat exchange power pump 608, the heat source side power pump 55, the heating side power pump 56, the thermal storage power pump 84, and the compression mechanism 51 are operating. Simultaneously, only the air heat exchange water supply valve 605, the air heat exchange return water valve 603, the main water supply valve 612, the main return water valve 611, the third thermal storage water supply valve 92, and the second thermal storage return water valve 94 are open. The first heat exchanger 52 acts as an evaporator, and the second heat exchanger 54 acts as a condenser. The remaining valves of the energy module 00 are closed, and the remaining power pumps of the energy module 00 are stopped.

[0124] Photothermal natural heat storage mode: Refer to Figure 11 Only the solar thermal power pump 615 is operating, and only the first thermal storage return water valve 604, the second thermal storage supply water valve 607, the solar thermal supply water valve 614, and the solar thermal return water valve 613 are in the open state. The remaining valves of the energy module 00 are in the closed state, and the remaining power pumps and the compressor mechanism 51 of the energy module 00 are stopped.

[0125] Photothermal mechanical heat storage mode: Refer to Figure 12 Only the solar thermal power pump 615, the heat source-side power pump 55, the heating-side power pump 56, the thermal storage power pump 84, and the compression mechanism 51 are operating. Simultaneously, only the solar thermal return water valve 613, the solar thermal supply water valve 614, the main supply water valve 612, the main return water valve 611, the third thermal storage supply water valve 92, and the second thermal storage return water valve 94 are open. The first heat exchanger 52 acts as an evaporator, and the second heat exchanger 54 acts as a condenser. The remaining valves of the energy module 00 are closed, and the remaining power pumps of the energy module 00 are stopped.

[0126] Cooling and heat storage mode: Refer to Figure 13 Only the thermal storage power pump 609, the heat source-side power pump 55, the heating-side power pump 56, and the compression mechanism 51 are operating. Simultaneously, only the first thermal storage return water valve 604, the first thermal storage supply water valve 606, the main return water valve 611, the main supply water valve 612, the heating supply water valve 42, and the heating return water valve 41 are open. The first heat exchanger 52 functions as a condenser, and the second heat exchanger 54 functions as an evaporator. The remaining valves of the energy module 00 are closed, and the remaining power pumps of the energy module 00 are stopped.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A centralized heating system, characterized in that, include: The centralized heating module includes a heat exchange station (3) and a primary network (1) and a secondary network (2) capable of heat exchange in the heat exchange station (3). The energy module (00) includes an air heat exchange unit (7), a heat storage unit (8), a heat pump unit (5), a water distribution unit (6), a control valve group, a green electricity unit (102), and a power distribution unit (101). The air heat exchange unit (7) and the heat storage unit (8) are connected to the heat pump unit (5) through the water distribution unit (6). The water distribution unit (6) is used to control the connection and disconnection between any two of the air heat exchange unit (7), the heat storage unit (8), and the heat pump unit (5). The heat pump unit (5) and the heat storage unit (8) are connected through a control valve group. The valve group is connected to the primary network (1). The control valve group is used to control the connection and disconnection between any two of the heat pump unit (5), the heat storage unit (8) and the primary network (1). The green power unit (102) generates electricity using renewable energy. The wires of the power distribution unit (101) are connected to the green power unit (102) and the municipal power grid (100). The power distribution unit (101) is used to supply power to the electrical components of the air heat exchange unit (7), the heat storage unit (8), the heat pump unit (5), the water distribution unit (6) and the control valve group.

2. The centralized heating system according to claim 1, characterized in that, The air heat exchange unit (7) has an air heat exchange inlet pipe (73) and an air heat exchange outlet pipe (74), the heat storage unit (8) has a heat storage inlet pipe (83) and a heat storage outlet pipe (82), and the heat pump unit (5) has a heat source inlet pipe and a heat source outlet pipe. The water distribution unit (6) includes: The water distribution assembly includes a water distributor (602), a thermal storage power pump (609), an air heat exchange power pump (608), and a main water supply valve (612), an air heat exchange water supply valve (605), a first thermal storage water supply valve (606), and a second thermal storage water supply valve (607) connected to the water distributor (602). The main water supply valve (612) is connected to the heat source outlet pipe, and the air heat exchange water supply valve (605) is connected to the air heat exchange inlet pipe (73). The first thermal storage water supply valve (606) and the second thermal storage water supply valve (607) are connected in parallel and are both connected to the thermal storage inlet pipe (83). The thermal storage power pump (609) is located in the branch where the first thermal storage water supply valve (606) is located, and the air heat exchange power pump (608) is located downstream of the air heat exchange water supply valve (605). The water collection assembly includes a water collector (601) and a main return water valve (611), an air heat exchange return water valve (603), and a first heat storage return water valve (604) connected to the water collector (601). The main return water valve (611) is connected to the heat source inlet pipe, the air heat exchange return water valve (603) is connected to the air heat exchange outlet pipe (74), and the first heat storage return water valve (604) is connected to the heat storage outlet pipe (82).

3. The centralized heating system according to claim 2, characterized in that, The heat pump unit (5) has a heating water supply pipe and a heating water return pipe. The heating water supply pipe is connected to the water supply pipe of the primary network (1) through a heating water supply branch (43). The heating water return pipe is connected to the water return pipe of the primary network (1) through a heating water return branch (44). The heating water supply pipe is connected to the heat storage inlet pipe (83) through a heat storage water supply branch (91). The heating water return pipe is connected to the heat storage outlet pipe (82) through a heat storage return branch (93). The control valve assembly includes: The heating valve assembly (4) includes a heating water supply valve (42) and a heating return water valve (41). The heating water supply valve (42) is located in the heating water supply branch (43), and the heating return water valve (41) is located in the heating return water branch (44). The thermal storage valve assembly (9) includes a third thermal storage water supply valve (92) and a second thermal storage water return valve (94). The third thermal storage water supply valve (92) is located in the thermal storage water supply branch (91), and the second thermal storage water return valve (94) is located in the thermal storage water return branch (93).

4. The centralized heating system according to claim 3, characterized in that, The heating water supply branch (43) is connected to the end of the water supply pipe of the primary network (1) near the heat exchange station (3), and the heating return water branch (44) is connected to the end of the return water pipe of the primary network (1) near the heat exchange station (3).

5. The centralized heating system according to claim 3, characterized in that, The electricity generated by the green power unit (102) comes from solar energy, wind energy, tidal energy or geothermal energy.

6. The centralized heating system according to claim 3, characterized in that, The green electricity unit (102) includes: The photovoltaic-thermal composite panel (01) has an electrical connection part and a water flow channel. The electrical connection part is electrically connected to the power distribution unit (101). The water distribution component also includes a photovoltaic-thermal power pump (615) and a photovoltaic-thermal water supply valve (614) disposed on the water distributor (602). The water collection component also includes a photovoltaic-thermal return water valve (613). The photovoltaic-thermal water supply valve (614) is connected to one end of the water flow channel through the photovoltaic-thermal power pump (615), and the photovoltaic-thermal return water valve (613) is connected to the other end of the water flow channel.

7. The centralized heating system according to claim 6, characterized in that, The heat storage unit (8) has a heat storage temperature detection element for detecting the internal water temperature, the air heat exchange unit (7) has an air heat exchange temperature detection element for detecting the outlet water temperature, and the green electricity unit (102) has a photothermal temperature detection element for detecting the outlet water temperature.

8. The centralized heating system according to claim 3, characterized in that, The heat pump unit (5) includes one or more heat pump devices. When the heat pump unit (5) includes multiple heat pump devices, the heat pump devices are connected in series or in parallel. The heat pump device includes a compression mechanism (51), a first heat exchanger (52), a throttle valve (53), and a second heat exchanger (54) connected in sequence; or, the heat pump unit (5) includes a compression mechanism (51), a four-way valve (57), and a first heat exchanger (52), a throttle valve (53), and a second heat exchanger (54) connected in sequence. The air intake of the compression mechanism (51), the exhaust port of the compression mechanism (51), the first heat exchanger (52), and the second heat exchanger (54) are connected to the four-way valve (57). The heat source inlet pipe and the heat source outlet pipe correspond to the first heat exchanger (52), and the heating supply pipe and the heating return pipe correspond to the second heat exchanger (54). The compression mechanism (51) includes one of a single-stage compressor, a single-stage gas-supplement compressor, a two-stage compressor, and a multi-stage compressor, or the compression mechanism (51) includes one of a single-stage compressor group, a single-stage gas-supplement compressor group, a two-stage compressor group, a multi-stage compressor group, and a cascade compressor group.

9. A control method for a centralized heating system, characterized in that, The control method of the centralized heating system, capable of controlling the energy module (00) of any one of claims 1 to 8 to operate in direct heat storage source mode, air source heat pump heating mode, heat storage source heat pump heating mode, air source natural heat storage mode, and air source mechanical heat storage mode, respectively, includes: The control water distribution unit (6) keeps any two of the air heat exchange unit (7), heat storage unit (8) and heat pump unit (5) in the off state, while the control valve group keeps only the heat storage unit (8) connected to the primary network (1) so that the energy module (00) operates in the direct supply mode of the heat storage source. Control the water distribution unit (6) to only connect the air heat exchange unit (7) and the heat pump unit (5), and control the control valve group to only connect the heat pump unit (5) and the primary network (1), so that the energy module (00) operates in the air source heat pump heating mode; Control the water distribution unit (6) to only connect the heat storage unit (8) and the heat pump unit (5), and control the control valve group to only connect the heat pump unit (5) and the primary network (1), so that the energy module (00) operates in the heat storage source heat pump heating mode; Control the water distribution unit (6) to only connect the air heat exchange unit (7) and the heat storage unit (8), and at the same time control the control valve group to keep any two of the heat pump unit (5), the heat storage unit (8) and the primary network (1) in the off state, so that the energy module (00) operates in the air energy natural heat storage mode. The water distribution unit (6) is controlled to only connect the air heat exchange unit (7) and the heat pump unit (5), and the control valve group is controlled to only connect the heat pump unit (5) and the heat storage unit (8), so that the energy module (00) operates in the air energy mechanical heat storage mode.

10. The control method for a centralized heating system according to claim 9, characterized in that, The green electricity unit (102) includes a photovoltaic-thermal composite panel (01), and the heat pump unit (5) includes a four-way valve (57). The control method for the centralized heating system can also control the energy module (00) of the centralized heating system to operate in solar thermal natural heat storage mode, solar thermal mechanical heat storage mode, and cooling heat storage mode, respectively. The control method for the centralized heating system further includes: Control the water distribution unit (6) to only connect the water flow channel of the heat storage unit (8) and the photovoltaic-thermal composite plate (01), and at the same time control the control valve group to keep any two of the heat pump unit (5), the heat storage unit (8) and the primary network (1) in the off state, so that the energy module (00) operates in the solar-thermal natural heat storage mode. The water distribution unit (6) is controlled to only connect the water flow channel of the photovoltaic-thermal composite plate (01) to the heat pump unit (5), and the control valve group is controlled to only connect the heat pump unit (5) to the heat storage unit (8), so that the energy module (00) operates in the photovoltaic-thermal mechanical heat storage mode. The water distribution unit (6) is controlled to only connect the heat storage unit (8) and the heat pump unit (5), while the control valve group is controlled to only connect the heat pump unit (5) and the primary network (1), and the four-way valve (57) is controlled to connect the exhaust port of the compression mechanism (51) of the heat pump unit (5) to the first heat exchanger (52), so that the energy module (00) operates in the cooling and heat storage mode.

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