A heating system and a control method, device, storage medium and program product thereof

Abstract

The application provides a heating system and a control method, device, storage medium and program product thereof, and belongs to the field of energy-saving air conditioning equipment.The heating system can run in an air source heat pump single operation mode, a gas boiler single operation mode, an air source heat pump and gas boiler parallel operation mode and an air source heat pump and gas boiler series operation mode; the control method comprises the following steps: determining a current heating period; determining a current operation mode according to the determined current heating period; controlling the heating system to enter the determined operation mode; and performing loading or unloading of the air source heat pump and / or the gas boiler according to the current air source heat pump energy efficiency ratio, the equivalent heat pump energy efficiency ratio of the gas boiler and the current water supply temperature and / or return water temperature.The scheme provided by the application can automatically switch between the heat pump or boiler single operation mode, the series mode and the parallel mode.

Description

Technical Field

[0001] This invention relates to the field of control, and more particularly to a heating system and its control method, device, storage medium and program product, belonging to energy-saving air conditioning equipment. Background Technology

[0002] In building heating, ventilation, and air conditioning systems, the selection of heat source and the matching of terminal heat dissipation methods directly determine the system's energy efficiency ratio and operating economy. Common terminal methods mainly include low-temperature underfloor heating and high-temperature radiators: underfloor heating systems typically require lower supply water temperatures (35~50℃) and smaller supply and return water temperature differences (≤10℃), which closely matches the high-efficiency operating range of air source heat pumps; while radiator systems often require higher supply water temperatures (>50℃) and larger supply and return water temperature differences. Gas boilers in related technologies have significant temperature regulation advantages under such conditions.

[0003] In related technologies, to balance initial investment costs and long-term operating expenses, an increasing number of projects are adopting heat source solutions that combine air source heat pumps and gas boilers. However, the combination methods in these technologies are mainly limited to simple parallel or series fixed architectures, lacking intelligent control strategies based on real-time environmental parameters and economic factors. Summary of the Invention

[0004] The technical problem to be solved by this invention is that the combination of air source heat pumps and gas boilers in related technologies is limited to simple parallel or series fixed structures. Therefore, this invention provides a heating system and its control method, device, storage medium and program product, which belongs to energy-saving air conditioning equipment.

[0005] This invention provides a control method for a heating system, the heating system comprising at least two sets of air source heat pumps and at least two sets of gas-fired boilers; the at least two sets of gas-fired boilers are connected in parallel, each of the at least two sets of gas-fired boilers comprising at least two gas-fired boilers; the at least two sets of air source heat pumps are connected in parallel, each of the at least two sets of air source heat pumps comprising at least two air source heat pumps; the water inlets of the at least two sets of gas-fired boilers are connected in parallel and then connected to at least two boiler water pumps; the water inlets of the at least two sets of air source heat pumps are connected in parallel and then connected to at least two heat pump water pumps; the adjustable flow range of the boiler water pumps is greater than the adjustable flow range of the heat pump water pumps; control valves are respectively provided on the water inlet pipes of the at least two sets of gas-fired boilers and the water inlet pipes of the at least two sets of air source heat pumps; the heating system is capable of operating in an air source heat pump standalone mode, a gas-fired boiler standalone mode, an air source heat pump and gas-fired boiler parallel operation mode, and an air source heat pump and gas-fired boiler series operation mode; the control method includes: Determine the current heating cycle; determine the current operating mode based on the determined current heating cycle; control the heating system to enter the determined operating mode; and execute the loading or unloading of the air source heat pump and / or gas boiler based on the current air source heat pump energy efficiency ratio, the equivalent heat pump energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature.

[0006] Optionally, the heating cycle includes: a first heating cycle, a second heating cycle, a third heating cycle, and a fourth heating cycle, wherein the outdoor temperature decreases sequentially in the first, second, third, and fourth heating cycles; based on the determined current heating cycle, the current operating mode is determined, including: if currently in the first or second heating cycle, determining whether to enter the air source heat pump standalone operation mode or the gas boiler standalone operation mode based on the current gas price, electricity price, and the average outdoor temperature of the day; if currently in the third heating cycle, determining whether to enter the air source heat pump and gas boiler parallel operation mode; if currently in the fourth heating cycle, determining whether to enter the air source heat pump and gas boiler series operation mode.

[0007] Optionally, if the current heating cycle is in its first heating period, the current operating mode is determined based on the current gas price, electricity price, and the average outdoor temperature of the day. This includes: calculating the current equivalent heat pump efficiency ratio (EER) of the gas boiler based on the current gas and electricity prices, and obtaining the air source heat pump EER corresponding to the average outdoor temperature of the day; determining the current operating mode based on the calculated current equivalent heat pump EER of the gas boiler and the obtained air source heat pump EER corresponding to the average outdoor temperature of the day; wherein, it is determined whether the current equivalent heat pump EER of the gas boiler is greater than the air source heat pump EER corresponding to the average outdoor temperature of the day; if the current equivalent heat pump EER of the gas boiler is greater than the air source heat pump EER corresponding to the average outdoor temperature of the day, then the gas boiler is determined to enter the gas boiler-only operating mode; otherwise, the air source heat pump is determined to enter the air source heat pump-only operating mode.

[0008] Optionally, controlling the heating system to enter a defined operating mode includes: if it is determined to enter an air source heat pump standalone operating mode, then the group of air source heat pumps with the shortest cumulative operating time is activated, and a corresponding heat pump water pump with the shortest cumulative operating time is activated; if it is determined to enter a gas boiler standalone operating mode, then the group of gas boilers with the shortest cumulative operating time is activated, and a corresponding boiler water pump with the shortest cumulative operating time is activated; if it is determined to enter an air source heat pump and gas boiler parallel operating mode, then the group of air source heat pumps and the group of gas boilers with the shortest cumulative operating time are activated, and a corresponding heat pump water pump and a corresponding boiler water pump with the shortest cumulative operating time are activated; if it is determined to enter an air source heat pump and gas boiler series operating mode, then the group of air source heat pumps and the group of gas boilers with the shortest cumulative operating time are activated, and a corresponding heat pump water pump with the shortest cumulative operating time is activated.

[0009] Optionally, based on the current air source heat pump energy efficiency ratio, the equivalent heat pump energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature, the loading or unloading of the air source heat pump and / or gas boiler is executed, including: if the air source heat pump is currently in standby mode, then in real time it is determined whether the current air source heat pump energy efficiency ratio is greater than the equivalent heat pump energy efficiency ratio of the gas boiler and whether the current supply water temperature and / or return water temperature meets preset requirements; if it is determined that the current air source heat pump energy efficiency ratio is greater than the equivalent heat pump energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature does not meet preset requirements and continues for a first preset time, then the air source heat pump loading step is executed; when all at least two sets of air source heat pumps are started... If, during operation, the current supply water temperature or return water temperature is higher than the set temperature by a preset temperature value for a second preset time, then the air source heat pump unloading step is executed; and / or, if the current operation mode is a gas boiler operating alone, then it is determined in real time whether the current air source heat pump efficiency ratio is less than the equivalent heat pump efficiency ratio of the gas boiler and whether the current supply water temperature and / or return water temperature meets the preset requirements; if it is determined that the current air source heat pump efficiency ratio is less than the equivalent heat pump efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature does not meet the preset requirements for a first preset time, then the gas boiler loading step is executed; when all at least two sets of gas boilers are running, if the current supply water temperature or return water temperature is higher than the set temperature... If the preset temperature value is higher than the preset value and continues for a second preset time, then the gas boiler unloading step is executed; and / or, if the current operation mode is a parallel operation mode of air source heat pump and gas boiler, then it is determined whether the current air source heat pump energy efficiency ratio is greater than or equal to the equivalent heat pump energy efficiency ratio of the gas boiler and whether the current supply water temperature and / or return water temperature meet the preset requirements; if it is determined that the current air source heat pump energy efficiency ratio is greater than or equal to the equivalent heat pump energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature does not meet the preset requirements and continues for a first preset time, then the air source heat pump loading step is executed first, followed by the gas boiler loading step; if it is determined that the current air source heat pump energy efficiency ratio is lower than the gas boiler energy efficiency ratio, then the gas boiler loading step is executed first. If the equivalent heat pump efficiency ratio of the boiler is not met, and the current supply water temperature and / or return water temperature does not meet the preset requirements for a first preset time, then the gas boiler loading step is executed first, followed by the air source heat pump loading step; if the current supply water temperature or return water temperature is higher than the set temperature by a preset temperature value for a second preset time, then the air source heat pump unloading step and / or the gas boiler unloading step is executed; wherein, if the current air source heat pump efficiency ratio is less than the equivalent heat pump efficiency ratio of the gas boiler, then the air source heat pump unloading step is executed first, followed by the gas boiler unloading step; if the current air source heat pump efficiency ratio is greater than the equivalent heat pump efficiency ratio of the gas boiler, then the gas boiler unloading step is executed first, followed by the air source heat pump unloading step.

[0010] Optionally, the air source heat pump loading step includes: loading the frequency of each main unit in each group of air source heat pumps to a first preset frequency, and then loading them to a second preset frequency; and / or, the air source heat pump unloading step includes: shutting down the main units of the group of air source heat pumps with the longest cumulative operating time, then closing the corresponding control valve, and then shutting down one heat pump water pump; and / or; the gas boiler loading step includes: loading the load of each boiler in each group of gas boilers to a first preset load rate, and then loading them to a second preset load rate; and / or; the gas boiler unloading step includes: shutting down each boiler in the group of gas boilers with the longest cumulative operating time, then closing the corresponding control valve, and then shutting down one boiler water pump.

[0011] Optionally, it further includes: if the current operation mode is an air source heat pump operating alone, then after executing the air source heat pump loading step, when the corresponding activated water pump is frequency-increased to a preset full-load frequency, if the air source heat pump operating alone cannot meet the requirements, then switching to an air source heat pump and gas boiler operating in parallel mode; and / or; if the current operation mode is a gas boiler operating alone, then after executing the gas boiler loading step, when the corresponding activated water pump is frequency-increased to a preset full-load frequency, if the gas boiler operating alone cannot meet the requirements, then switching to an air source heat pump and gas boiler operating in parallel mode; and / or; if the current operation mode is an air source heat pump and gas boiler operating in parallel mode, when all at least two sets of air source heat pumps are loaded to a preset full-load frequency and all at least two sets of gas boilers are loaded to the maximum load rate, if the current supply water temperature and / or return water temperature still do not meet the preset requirements, then entering an air source heat pump and gas boiler operating in series mode.

[0012] Optionally, the system further includes: when the heating system is operating in parallel mode with the air source heat pump and the gas boiler or in series mode with the air source heat pump and the gas boiler, determining whether the air source heat pump will frost based on outdoor environmental parameters within a preset future time period; if it is determined that the air source heat pump will frost, and the equivalent heat pump efficiency ratio of the gas boiler is greater than the defrosting efficiency ratio of the air source heat pump corresponding to the average outdoor temperature within the preset future time period, then the air source heat pump is unloaded and the gas boiler is loaded; if it is determined that the air source heat pump will frost, and the equivalent heat pump efficiency ratio of the gas boiler is not greater than the defrosting efficiency ratio of the air source heat pump corresponding to the outdoor temperature within the preset future time period, then the air source heat pump is no longer loaded.

[0013] In another aspect, the present invention provides a control device for a heating system, the heating system comprising at least two sets of air source heat pumps and at least two sets of gas-fired boilers; the at least two sets of gas-fired boilers are connected in parallel, each of the at least two sets of gas-fired boilers comprising at least two gas-fired boilers; the at least two sets of air source heat pumps are connected in parallel, each of the at least two sets of air source heat pumps comprising at least two air source heat pumps; the water inlets of the at least two sets of gas-fired boilers are connected in parallel to at least two boiler water pumps; the water inlets of the at least two sets of air source heat pumps are connected in parallel to at least two heat pump water pumps; the adjustable flow range of the boiler water pumps is greater than the adjustable flow range of the heat pump water pumps; the water inlet pipes of the at least two sets of gas-fired boilers and the at least two sets of air source heat pumps are connected in parallel; The air source heat pump is equipped with control valves on its inlet pipe; the heating system is capable of operating in a standalone mode for the air source heat pump, a standalone mode for the gas boiler, a parallel mode for the air source heat pump and the gas boiler, and a series mode for the air source heat pump and the gas boiler; the control device includes: a first determining unit for determining the current heating cycle; a second determining unit for determining the current operating mode based on the current heating cycle determined by the first determining unit; a control unit for controlling the heating system to enter the determined operating mode; and an execution unit for executing the loading or unloading of the air source heat pump and / or the gas boiler based on the current air source heat pump energy efficiency ratio, the equivalent heat pump energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature.

[0014] Optionally, the heating cycle includes: a first heating cycle, a second heating cycle, a third heating cycle, and a fourth heating cycle, wherein the outdoor temperature decreases sequentially in the first, second, third, and fourth heating cycles; the second determining unit determines the current operating mode based on the current heating cycle determined by the first determining unit, including: if the current heating cycle is the first or second functional cycle, then based on the current gas price, electricity price, and the average outdoor temperature of the day, determining whether to enter the air source heat pump standalone operation mode or the gas boiler standalone operation mode; if the current heating cycle is the third heating cycle, determining whether to enter the air source heat pump and gas boiler parallel operation mode; if the current heating cycle is the fourth heating cycle, determining whether to enter the air source heat pump and gas boiler series operation mode.

[0015] Optionally, if the second determining unit is currently in the first heating cycle, it determines the current operating mode based on the current gas price, electricity price, and the average outdoor temperature of the day. This includes: calculating the current equivalent heat pump energy efficiency ratio (EER) of the gas boiler based on the current gas price and electricity price, and obtaining the air source heat pump EER corresponding to the average outdoor temperature of the day; determining the current operating mode based on the calculated current equivalent heat pump EER of the gas boiler and the obtained air source heat pump EER corresponding to the average outdoor temperature of the day; wherein, it determines whether the current equivalent heat pump EER of the gas boiler is greater than the air source heat pump EER corresponding to the average outdoor temperature of the day; if the current equivalent heat pump EER of the gas boiler is greater than the air source heat pump EER corresponding to the average outdoor temperature of the day, it determines to enter the gas boiler stand-alone operating mode; otherwise, it determines to enter the air source heat pump stand-alone operating mode.

[0016] Optionally, the control unit controls the heating system to enter a determined operating mode, including: if it is determined to enter the air source heat pump stand-alone operating mode, then the group of air source heat pumps with the shortest cumulative operating time is turned on, and a heat pump water pump with the shortest cumulative operating time is turned on accordingly.

[0017] If it is determined to enter the gas-fired boiler standalone operation mode, then the group of gas-fired boilers with the shortest cumulative operating time will be turned on, and correspondingly, one boiler water pump with the shortest cumulative operating time will be turned on. If it is determined to enter the air source heat pump and gas-fired boiler parallel operation mode, then the group of air source heat pumps and the group of gas-fired boilers with the shortest cumulative operating time will be turned on, and correspondingly, one heat pump water pump and one boiler water pump with the shortest cumulative operating time will be turned on. If it is determined to enter the air source heat pump and gas-fired boiler series operation mode, then the group of air source heat pumps and the group of gas-fired boilers with the shortest cumulative operating time will be turned on, and correspondingly, one heat pump water pump with the shortest cumulative operating time will be turned on.

[0018] Optionally, the execution unit, based on the current air source heat pump energy efficiency ratio, the equivalent heat pump energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature, executes loading or unloading of the air source heat pump and / or gas boiler, including: if the air source heat pump is currently in standby mode, then in real time it is determined whether the current air source heat pump energy efficiency ratio is greater than the equivalent heat pump energy efficiency ratio of the gas boiler and whether the current supply water temperature and / or return water temperature meets preset requirements; if it is determined that the current air source heat pump energy efficiency ratio is greater than the equivalent heat pump energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature does not meet preset requirements and continues for a first preset time, then an air source heat pump loading step is executed; when the at least two sets of air source heat pumps When all units are running, if the current supply water temperature or return water temperature is higher than the set temperature by a preset value for a second preset time, the air source heat pump will be unloaded; and / or, if the gas boiler is currently in standby mode, it will be determined in real time whether the current air source heat pump efficiency ratio is less than the equivalent heat pump efficiency ratio of the gas boiler and whether the current supply water temperature and / or return water temperature meets the preset requirements; if it is determined that the current air source heat pump efficiency ratio is less than the equivalent heat pump efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature does not meet the preset requirements for a first preset time, the gas boiler will be loaded; when all at least two gas boilers are running, if the current supply water temperature or return water temperature is higher than the set temperature by a preset value for a second preset time, the air source heat pump will be unloaded; if the current supply water temperature or return water temperature is higher than the set temperature for a second preset time, the air source heat pump will be unloaded; if the current supply ... If the set temperature is higher than the preset temperature value and remains higher for a second preset time, then the gas boiler unloading step is executed; and / or, if the current operation mode is a parallel operation mode of air source heat pump and gas boiler, then it is determined whether the current air source heat pump energy efficiency ratio is greater than or equal to the equivalent heat pump energy efficiency ratio of the gas boiler and whether the current supply water temperature and / or return water temperature meet the preset requirements; if it is determined that the current air source heat pump energy efficiency ratio is greater than or equal to the equivalent heat pump energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature does not meet the preset requirements and remains higher for a first preset time, then the air source heat pump loading step is executed first, followed by the gas boiler loading step; if it is determined that the current air source heat pump energy efficiency ratio is lower than the gas boiler energy efficiency ratio, then the gas boiler loading step is executed first. If the equivalent heat pump efficiency ratio of the boiler is not met, and the current supply water temperature and / or return water temperature does not meet the preset requirements for a first preset time, then the gas boiler loading step is executed first, followed by the air source heat pump loading step; if the current supply water temperature or return water temperature is higher than the set temperature by a preset temperature value for a second preset time, then the air source heat pump unloading step and / or the gas boiler unloading step is executed; wherein, if the current air source heat pump efficiency ratio is less than the equivalent heat pump efficiency ratio of the gas boiler, then the air source heat pump unloading step is executed first, followed by the gas boiler unloading step; if the current air source heat pump efficiency ratio is greater than or equal to the equivalent heat pump efficiency ratio of the gas boiler, then the gas boiler unloading step is executed first, followed by the air source heat pump unloading step.

[0019] Optionally, the execution unit performs an air source heat pump loading step, including: loading the frequency of each main unit in each group of air source heat pumps to a first preset frequency, and then loading them to a second preset frequency; and / or, the execution unit performs an air source heat pump unloading step, including: first shutting down the main units of the group of air source heat pumps with the longest cumulative operating time, then closing the corresponding control valve, and then shutting down one heat pump water pump; and / or, the execution unit performs a gas boiler loading step, including: first loading the load of each boiler in each group of gas boilers to a first preset load rate, and then loading them to a second preset load rate; and / or, the execution unit performs a gas boiler unloading step, including: first shutting down each boiler in the group of gas boilers with the longest cumulative operating time, then closing the corresponding control valve, and then shutting down one boiler water pump.

[0020] Optionally, it further includes: a switching unit; the switching unit is configured to, if currently in the air source heat pump standalone operation mode, after executing the air source heat pump loading step, when the corresponding activated water pump is frequency-increased to a preset full-load frequency, if the air source heat pump standalone operation requirements cannot be met, switch to the air source heat pump and gas boiler parallel operation mode; and / or; the switching unit is configured to, if currently in the gas boiler standalone operation mode, after executing the gas boiler loading step, when the corresponding activated water pump is frequency-increased to a preset full-load frequency, if the gas boiler standalone operation requirements cannot be met, switch to the air source heat pump and gas boiler parallel operation mode; and / or; the switching unit is configured to, if currently in the air source heat pump and gas boiler parallel operation mode, when all at least two sets of air source heat pumps are loaded to a preset full-load frequency and all at least two sets of gas boilers are loaded to the maximum load rate, if the current supply water temperature and / or return water temperature still do not meet the preset requirements, switch to the air source heat pump and gas boiler series operation mode.

[0021] Optionally, the system further includes: a third determining unit, configured to determine whether the air source heat pump will frost based on outdoor environmental parameters within a preset future time period when the heating system is operating in parallel mode of the air source heat pump and the gas boiler or in series mode of the air source heat pump and the gas boiler; and an adjusting unit, configured to reduce the load on the air source heat pump and increase the load on the gas boiler if the third determining unit determines that the air source heat pump will frost and the equivalent heat pump efficiency ratio of the gas boiler is greater than the defrosting efficiency ratio of the air source heat pump corresponding to the outdoor temperature within the preset future time period; and to stop the load on the air source heat pump if the third determining unit determines that the air source heat pump will frost and the equivalent heat pump efficiency ratio of the gas boiler is not greater than the defrosting efficiency ratio of the air source heat pump corresponding to the outdoor temperature within the preset future time period.

[0022] In another aspect, the present invention provides a storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0023] In another aspect, the present invention provides a heating system including a processor, a memory, and a computer program stored in the memory that can run on the processor, wherein the processor executes the program to implement the steps of any of the aforementioned methods.

[0024] In another aspect, the present invention provides a heating system including any of the control devices described above.

[0025] In another aspect, the present invention provides a computer program product, including a computer program that, when executed by a processor, implements the steps of any of the methods described above.

[0026] According to the technical solution of the present invention, an HVAC system that uses a combination of air source heat pump and gas boiler for heating can automatically and intelligently switch between four operating modes: pure air source, pure boiler, heat pump and boiler in series, and heat pump and boiler in parallel. This is achieved by collecting outdoor meteorological parameters, terminal load demand, real-time gas-electricity price ratio and heat pump energy efficiency in real time.

[0027] According to the technical solution of the present invention, in order to address the low reliability of series systems, a fault degradation and reconfiguration logic is designed to ensure that the system can seamlessly switch to independent operation of a single heat source when a single device fails, thus ensuring the continuity of heating. At the same time, a variable water temperature and variable flow rate coordinated control strategy is adopted to dynamically adjust the supply and return water temperature difference and pump frequency according to the current optimal operating mode, so as to avoid energy waste caused by a fixed temperature difference and maximize the overall energy efficiency and minimize the operating cost of the system under all climate zones.

[0028] According to the technical solution of the present invention, by calculating different gas boiler + heat pump ratios, the most economical solution can be obtained for different regions, whether it is a mild transitional season or a severe winter, and it is applicable to different climate zones.

[0029] According to the technical solution of the present invention, the COP of the equivalent heat pump of the gas boiler can be obtained based on real-time meteorological data, load demand and gas-electricity price ratio. By comparing the real-time heat pump energy efficiency, it can automatically and seamlessly switch between pure air source mode, pure boiler mode, heat pump-boiler series mode and heat pump-boiler parallel mode. This ensures that the system prioritizes the use of high-efficiency heat pumps during mild transitional seasons, utilizes boilers for supplemental heating or series heating during severe winters, and flexibly adjusts strategies during periods of high electricity price / low gas price, so that the system always operates in the optimal COP range. This solves the energy efficiency bottleneck of single mode or fixed combination mode and has energy-saving effect.

[0030] According to the technical solution of this invention, a real-time gas-to-electricity ratio calculation model is introduced, and combined with peak-valley electricity pricing policies, the energy combination with the lowest overall operating cost for the current period is automatically selected. For example, during periods of low electricity prices or high gas prices, the system automatically tends to maximize the output of the air source heat pump; conversely, it prioritizes the use of the boiler. This strategy effectively copes with complex and variable climate conditions and drastically fluctuating energy prices, significantly reducing the total life-cycle operating costs. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 This is a schematic diagram of an embodiment of the control method for a heating system provided by the present invention;

[0033] Figure 2 A general diagram of a heating system for an air-source heat pump and a gas boiler according to a specific embodiment of the present invention is shown;

[0034] Figure 3 A schematic diagram of a stand-alone heating system for an air-source heat pump according to a specific embodiment of the present invention is shown.

[0035] Figure 4 A schematic diagram of a gas-fired boiler operating independently for heating according to a specific embodiment of the present invention is shown;

[0036] Figure 5 A schematic diagram of a parallel heating system of an air source heat pump and a gas boiler according to a specific embodiment of the present invention is shown;

[0037] Figure 6 A schematic diagram of a series heating system of an air source heat pump and a gas boiler according to a specific embodiment of the present invention is shown;

[0038] Figure 7 This is a schematic diagram showing the composition of a combined air source heat pump and gas boiler system;

[0039] Figure 8 This illustrates an example of the optimal combination of air source heat pump and gas boiler heating systems in different regions;

[0040] Figure 9 This is a schematic diagram of another embodiment of the control method for the heating system provided by the present invention;

[0041] Figure 10 This is a schematic diagram of the defrosting control process based on outdoor environmental parameters in the series or parallel operation mode of air source heat pump and gas boiler;

[0042] Figure 11 This is a schematic diagram illustrating the modified operation mode of a hybrid heating system combining air source heat pumps and gas boilers.

[0043] Figure 12 This is a schematic diagram illustrating mode switching in the event of a fault in a hybrid heating system combining air source heat pump and gas boiler.

[0044] Figure 13A This is a partial flowchart of a specific embodiment of the control method for a heating system provided by the present invention;

[0045] Figure 13B This is another part of a flowchart illustrating a specific embodiment of the control method for a heating system provided by the present invention;

[0046] Figure 14 This is a structural block diagram of an embodiment of the control device for a heating system provided by the present invention. Detailed Implementation

[0047] 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 in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0048] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0049] The combination of air source heat pumps and gas boilers in related technologies is mainly limited to simple parallel or series fixed architectures, lacking intelligent control strategies based on real-time environmental parameters and economic factors. The specific limitations are analyzed as follows:

[0050] Air source heat pump stand-alone operation mode: Although it has high energy efficiency, the initial investment is high and it is significantly affected by the ambient temperature. As the outdoor temperature decreases, the heating capacity decreases and the COP value drops. It is difficult to independently meet the high load demand in extremely cold weather, resulting in insufficient system reliability.

[0051] Gas-fired boilers in stand-alone operation mode have advantages such as low initial investment, stable output, and no impact from low outdoor temperatures. However, their primary energy utilization rate is relatively low, and their operating costs are directly affected by fluctuations in natural gas prices, lacking seasonal economic adjustment space.

[0052] Parallel operation mode in related technologies: In this mode, the two devices usually operate independently or are simply superimposed. Although the high energy efficiency of the heat pump and the temperature stability of the boiler can be utilized, the system lacks global optimization control. Especially in scenarios with fluctuating gas and electricity prices and changes in day and night temperature differences, it is impossible to dynamically select the optimal heat source combination, often resulting in uneconomical phenomena such as "using the heat pump first during low-temperature operating periods" or "frequent start-up and shutdown of the boiler during low-load periods".

[0053] The series operation mode in related technologies: This mode typically uses a heat pump as the primary preheater and a boiler as the secondary supplementary heater, which is suitable for scenarios with high requirements for supply water temperature. However, this strongly coupled structure leads to reduced system reliability. If any component (such as the heat pump compressor or boiler) fails, the entire heating chain is interrupted. Furthermore, the series structure makes it difficult to flexibly switch to a pure heat pump or pure boiler efficient independent operation mode, limiting the system's adaptability to different meteorological conditions.

[0054] In summary, the relevant technologies lack an intelligent control system that can automatically and optimally switch between pure air source, pure boiler, series coupling, and parallel complementary modes based on real-time gas-electricity ratio, outdoor weather, and terminal load demand. The aim is to break the limitations of a single operating mode and achieve the minimum energy consumption and optimal operating cost under all operating conditions while ensuring the continuity and reliability of heating.

[0055] This invention solves the following technical problems:

[0056] The related technologies suffer from poor environmental adaptability and energy efficiency degradation when using a single heat source: pure air source heat pump systems experience severe reduction in heating capacity at low temperatures, resulting in a significant drop in the COP value, and it is difficult to stably provide high-temperature water supply above 60°C; pure gas boiler systems have lower thermal efficiency than air source heat pumps when the ambient temperature is high or during transitional seasons, leading to an "overpowered" system and a significant increase in operating energy consumption and costs.

[0057] The series-parallel combination in related technologies suffers from a lack of global optimization control: Parallel systems in these technologies typically serve only as backup and complement, lacking intelligent scheduling based on real-time gas-electricity ratios, diurnal temperature variations, and load changes. They cannot dynamically switch between total heat pump, total boiler, and hybrid operation modes, resulting in the system operating in suboptimal conditions for extended periods. Series systems in related technologies exhibit high coupling; a failure in any component (such as the heat pump or boiler) interrupts the entire heating chain, leading to low system redundancy and difficulty in ensuring heating continuity.

[0058] Energy waste caused by inaccurate matching of supply and return water parameters in related technologies: Systems in related technologies often use fixed supply and return water temperature differences and water flow rate settings, which cannot be dynamically adjusted according to outdoor weather conditions and actual load demands at the terminal. Maintaining a high supply water temperature when the outdoor temperature is high results in superheat waste and increased energy consumption of the circulating water pump.

[0059] The lack of a multi-mode adaptive switching mechanism in related technologies: Related technologies cannot automatically decide and switch to one of the four modes—pure air source, pure boiler, series connection of both, and parallel connection of both—based on fluctuations in gas and electricity prices and climate characteristics. This results in the system being unable to achieve dual optimization of comprehensive energy efficiency and operating costs throughout the year-round operation cycle.

[0060] This invention provides a control method for a heating system. The method is used in a hybrid heating system combining an air source heat pump and a gas boiler. Preferably, the method can be used in a regional distributed heating cluster, which includes two or more heating systems, allowing for individual control of each system. For example, the control method can be implemented on a cloud control platform, where multiple hybrid heating systems combining air source heat pumps and gas boilers located in different buildings or areas are connected to the cloud control platform via an Internet of Things (IoT) gateway and controlled through the cloud control platform.

[0061] The heating system includes an air source heat pump and a gas boiler. The heating system can realize four operating modes: pure air source heat pump heating (air source heat pump operates alone), pure gas boiler heating (gas boiler operates alone), parallel heating of air source heat pump and gas boiler, and series heating of air source heat pump and gas boiler.

[0062] The heating system includes at least two sets of air source heat pumps and at least two sets of gas-fired boilers. The at least two sets of gas-fired boilers are connected in parallel, and each set includes at least two gas-fired boilers. Similarly, the at least two sets of air source heat pumps are connected in parallel, and each set includes at least two air source heat pumps. The ratio of air source heat pumps to gas-fired boilers in the air conditioning system is n:1. The number of air source heat pumps corresponds to the number of gas-fired boilers.

[0063] The user-side return water pipeline is connected to multiple water pumps in parallel and then splits into two paths. One path connects to the inlet of the at least two sets of gas-fired boilers, and the other path connects to the inlet of the at least two sets of air-source heat pumps via control valves. The multiple water pumps include at least two boiler water pumps and at least two heat pump water pumps. The adjustable flow range of the boiler water pumps is greater than that of the heat pump water pumps. Control valves (e.g., butterfly valves) are installed on the inlet pipelines of the at least two sets of gas-fired boilers (the pipelines before parallel connection). The outlets of the at least two sets of gas-fired boilers are connected in parallel to the user-side water supply pipeline. Control valves (e.g., butterfly valves) are installed on the inlet pipelines of the at least two sets of air-source heat pumps (the pipelines before parallel connection). The outlets of the at least two sets of air-source heat pumps are connected in parallel and then split into two branches. One branch connects to the inlet of the two sets of gas-fired boilers (the pipelines after parallel connection) via a control valve (e.g., butterfly valve), and the other branch connects to the user-side water supply pipeline via a control valve (e.g., butterfly valve). The number of boiler water pumps corresponds to the number of gas-fired boiler sets, and the number of heat pump water pumps corresponds to the number of air-source heat pump sets. Optionally, at least one boiler water pump is also provided as a backup water pump. Temperature sensors and heat meters are respectively installed on the main supply and return water pipelines of the air-source heat pump, the main supply and return water pipelines of the gas-fired boiler, and the main supply and return water pipelines of the heating system.

[0064] The inlet ends of the at least two sets of gas-fired boilers are connected in parallel and then connected to at least two boiler water pumps via control valves (e.g., butterfly valves). The at least two boiler water pumps are connected to the user-side return water pipeline. Each of the inlet pipelines (the pipelines before parallel connection) of the at least two sets of gas-fired boilers is equipped with a control valve (e.g., butterfly valve). The outlet ends of the at least two sets of gas-fired boilers are connected in parallel and then connected to the user-side heating / cooling water supply pipeline.

[0065] The inlet ends of the at least two sets of air source heat pumps (hereinafter referred to as heat pumps) are connected in parallel and then connected to at least two heat pump water pumps. The at least two heat pump water pumps are connected to the user-side heating / cooling return water pipeline. The inlet end pipelines of the at least two sets of air source heat pumps are respectively equipped with control valves (e.g., butterfly valves). The outlet ends of the at least two sets of air source heat pumps are connected in parallel and then divided into two branches. One branch is connected to the inlet end of the at least two sets of gas boilers (parallel pipelines) through a control valve, and the other branch is connected to the user-side heating / cooling water supply pipeline through a control valve.

[0066] Figure 2 A general diagram of a heating system for an air-source heat pump and a gas-fired boiler according to a specific embodiment of the present invention is shown. Figure 3 A schematic diagram of a stand-alone heating system using an air source heat pump according to a specific embodiment of the present invention is shown. Figure 4 A schematic diagram of a gas-fired boiler operating independently for heating, according to a specific embodiment of the present invention, is shown. Figure 5 A schematic diagram of a parallel heating system of an air source heat pump and a gas boiler according to a specific embodiment of the present invention is shown. Figure 6 A schematic diagram of a series heating system of an air source heat pump and a gas boiler according to a specific embodiment of the present invention is shown.

[0067] refer to Figures 2-6 As shown, the air conditioning system includes two sets of air source heat pumps and two sets of gas-fired boilers. The two sets of gas-fired boilers are connected in parallel. Each set of gas-fired boilers (hereinafter referred to as boilers) includes at least two boilers, wherein one set includes boilers 11-1, ..., 11-N, and the other set includes boilers 12-1, ..., 12-N. The two sets of air source heat pumps are also connected in parallel. Each set of air source heat pumps (hereinafter referred to as heat pumps) includes at least two air source heat pumps, wherein one set includes heat pumps 21-1, ..., 21-M, and the other set includes heat pumps 22-1, ..., 22-M. The ratio of the number of air source heat pumps to the number of gas-fired boilers in the air conditioning system is n:1.

[0068] The user-side heating / cooling return water pipeline connects to two boiler water pumps and two heat pump water pumps in parallel, then splits into two lines. One line connects to the inlet of the two sets of gas-fired boilers, and the other line connects to the inlet of the two sets of air-source heat pumps via a seventh control valve. The inlet pipelines of the two sets of gas-fired boilers (the pipelines before parallel connection) are equipped with a first control valve F1 and a second control valve F2 (e.g., butterfly valves). The outlets of the two sets of gas-fired boilers are connected in parallel to the user-side heating / cooling water supply pipeline. The inlet pipelines of the two sets of air-source heat pumps (the pipelines before parallel connection) are equipped with a third control valve F3 and a fourth control valve F4 (e.g., butterfly valves). The outlets of the two sets of air-source heat pumps are connected in parallel and then split into two branches. One branch connects to the inlet of the two sets of gas-fired boilers (the pipelines after parallel connection) via a fifth control valve F5 (e.g., butterfly valve), and the other branch connects to the user-side water supply pipeline via a sixth control valve F6 (e.g., butterfly valve).

[0069] The inlet ends of the two sets of gas-fired boilers are connected in parallel and then connected to two boiler water pumps via a seventh control valve F7 (e.g., a butterfly valve). The two boiler water pumps are connected to the user-side return water pipeline. The inlet pipelines of the two sets of gas-fired boilers (the pipelines before parallel connection) are respectively equipped with a first control valve F1 and a second control valve F2 (e.g., butterfly valves). The outlet ends of the two sets of gas-fired boilers are connected in parallel and then connected to the user-side heating / cooling water supply pipeline.

[0070] The inlet ends of the two sets of air source heat pumps (hereinafter referred to as heat pumps) are connected in parallel and then connected to two heat pump water pumps. The two heat pump water pumps are connected to the user-side heating / cooling return water pipeline. The inlet end pipelines of the two sets of air source heat pumps are respectively equipped with a third control valve F3 and a fourth control valve F4 (for example, a butterfly valve). The outlet ends of the two sets of air source heat pumps are connected in parallel and then divided into two branches. One branch is connected to the inlet end of the two sets of gas boilers (parallel pipeline) through a fifth control valve F5 (for example, a butterfly valve), and the other branch is connected to the user-side heating / cooling water supply pipeline through a sixth control valve F6 (for example, a butterfly valve).

[0071] The return water temperature of the main heating pipe of the heating system is T5, the supply water temperature of the main heating pipe is T6, the return water temperature of the main gas boiler is T1, the supply water temperature of the main gas boiler is T2, the return water temperature of the main air source heat pump is T3, and the supply water temperature of the main air source heat pump is T4. All of these can be detected by temperature sensors.

[0072] Figure 3 This diagram illustrates a pure air-source heat pump heating system. The air-source heat pump operates independently, and the gas boiler is not activated. The user-side return water (blue pipe), assuming a temperature of 40°C, flows along the direction of the (orange) arrow, passing through the heat pump pumps (blue pipe, the two on the right), and then through control valves F3 and F4 to each heat pump group (the heat pumps are activated according to heating demand). After being heated by the heat pumps (e.g., from 40°C to 45°C), the water converges through the (red) pipe and is then sent to the user-side for heating along the direction of the (orange) arrow via control valve F6. The gray areas in the diagram represent those devices or pipes that are not in use in this mode.

[0073] Figure 4 A schematic diagram of a pure gas-fired boiler heating system is shown. The gas boiler operates independently, and the air source heat pump is not activated. The user-side heating return water (blue pipe), assuming a temperature of 40°C, flows along the direction of the (orange) arrow, passing through the boiler pumps (blue pipes, the two in the middle), and then through the first control valve F1 and the second control valve F2 to each boiler group (the boilers are activated according to heating demand). After being heated by the boilers (e.g., from 40°C to 45°C), the water converges through the (red) pipe and is then sent to the user side for heating along the direction of the (orange) arrow. The gray areas in the diagram represent those devices or pipes that are not in use under this mode.

[0074] Figure 5A schematic diagram of a parallel heating system consisting of an air source heat pump and a gas boiler is shown. The air source heat pump and the gas boiler operate in parallel. The user-side heating return water (blue pipe), assuming a temperature of 40°C, flows along the direction of the (orange) arrow. After passing through the boiler pump and the heat pump, it splits into two paths. One path first flows through the seventh control valve F7, then through the first control valve F1 and the second control valve F2 to each boiler (which operates according to heating demand). After being heated by the boilers (e.g., from 40°C to 45°C), the water converges again through the (red) pipe and is then sent to the user side for heating along the (orange) arrow. The other path flows through the third control valve F3 and the fourth control valve F4 (butterfly valves F3 and F4) to each heat pump (which operates according to heating demand). After being heated by the heat pumps (e.g., from 40°C to 45°C), the water converges again through the (red) pipe and is then sent to the user side for heating along the direction of the (orange) arrow through the sixth control valve. The gray area in the diagram represents the part of the equipment or pipeline that is not enabled in this mode.

[0075] Figure 6 This diagram illustrates a series heating system consisting of an air-source heat pump and a gas boiler. The user-side return water (blue pipe), assuming a temperature of 40°C, flows along the direction of the (orange) arrow, passing through the boiler pump or heat pump pump (depending on heating demand; higher demand requires higher pump operation, up to a maximum of all four pumps operating simultaneously). It then flows through the third control valve F3 and the fourth control valve F4 to each heat pump group (heat pumps are activated based on heating demand). After being heated by the heat pumps (e.g., from 40°C to 45°C), the water converges through the (red) pipe, then flows through the (yellow) pipe, the fifth control valve F5, the first control valve F1, and the second control valve F2 to each boiler group. After being heated by the boilers (e.g., to 50°C), the water converges again through the (red) pipe and is then delivered to the user-side for heating along the direction of the (orange) arrow. The gray areas in the diagram represent those pipes that are not in use under this mode.

[0076] Figure 7 This is a schematic diagram showing the components of a combined air source heat pump and gas boiler system. Figure 8 This paper presents an example of the optimal ratio of air source heat pumps and gas boilers for heating systems in different regions. By calculating different ratios of heat pumps and gas boilers in different regions, the optimal investment payback period scheme with low operating costs and low initial investment is obtained. Therefore, setting the heat pump and boiler in an n:1 configuration is applicable to various regions, achieving the effect of the optimal design scheme. Simultaneously, the boilers and heat pumps are grouped, with the number of pumps corresponding to the number of groups. Large pumps are broken down into multiple smaller pumps, increasing the adjustable flow range (the lower limit of a single pump is, for example, 60%), better accommodating complex and variable building loads, and allowing heat pumps to be defrosted in rotation.

[0077] The total building load Q is divided into n+1 parts, where n is the proportion of air source heat pumps and 1 is the proportion of gas boilers. For example, when the building is located in a cold region with low gas prices, more gas boilers are required, and n < 1; when the building is located in a hot-summer, warm-winter region, air source heat pumps are more energy efficient, and n > 1. Specific allocation ratios can be found by referring to [reference needed]. Figure 8 As shown, the allocation ratio is determined based on the optimal investment payback period.

[0078] Air source heat pumps and gas boilers are divided into more than one group, for example, by control valves (such as electric butterfly valves). When the target water supply temperature of the heating main pipe does not meet the requirements, the number of control valves (such as electric butterfly valves) opened is increased; (the number of groups is ≥1, which is related to the number of equipment. The number of heat pump groups is the same as the number of gas boiler groups, which facilitates series heating.)

[0079] Air source heat pumps and gas boilers use different water pumps, with their respective pump numbers, parameters, group numbers, and internal equipment numbers corresponding to each. In parallel operation, starting one air source heat pump or gas boiler corresponds to starting one water pump. In series operation, different numbers of pumps can be used to achieve a large temperature difference and low flow rate, reducing pump energy consumption. Whether to prioritize boiler or heat pump operation under series / parallel conditions is determined by the Coefficient of Performance (COP): startup is based on the input COP, and operation is based on the calculated COP. For example, with two heat pumps and two boilers, two heat pumps are selected, with flow rates calculated as the total flow rate of a single heat pump multiplied by a safety factor; two boiler pumps are selected, with flow rates calculated as the total flow rate of a single boiler multiplied by a safety factor. The equivalent heat pump COP for the gas boiler... f = (Gas calorific value gg / Electricity calorific value gd) × (Electricity price Md / Gas price Mg) × Gas heat source efficiency n. The higher the gas-to-electricity ratio (the ratio of gas price to electricity price), the lower the equivalent energy efficiency ratio (COP).

[0080] Figure 1 This is a schematic diagram of an embodiment of the control method for a heating system provided by the present invention.

[0081] like Figure 1 As shown, according to an embodiment of the present invention, the control method of the heating system includes at least steps S110, S120, S130 and S140.

[0082] Step S110: Determine the current heating cycle.

[0083] Specifically, two or more heating cycles are pre-set, each corresponding to a different time range, and the initial target temperature T6 for the main heating pipe supply is set for each heating cycle. The functional cycle includes a first heating cycle, a second heating cycle, a third heating cycle, and a fourth heating cycle. The outdoor temperature decreases sequentially in the first, second, third, and fourth heating cycles.

[0084] For example, four heating cycles can be pre-set according to the season: early winter / early spring, early winter to mid-winter, mid-winter to late winter, and late winter. The first heating cycle is early winter / early spring, the second heating cycle is early winter to mid-winter, the third heating cycle is mid-winter to late winter, and the fourth heating cycle is late winter. For example, the time range of early winter / early spring is mid-October to mid-November / early March to early April; the time range of early winter to mid-winter is mid-November to mid-December; the time range of mid-winter to late winter is mid-December to early January; and the time range of late winter is early January to the end of February. The system determines which of the four heating cycles (early winter / early spring, early winter to mid-winter, mid-winter to late winter, and late winter) the current heating cycle is in, and determines the corresponding initial target temperature for the main heating pipe. In one specific implementation, the initial target temperature for the main heating pipe corresponding to the current heating cycle can be determined based on the pre-set correspondence between the initial target temperatures for the main heating pipe for different heating cycles.

[0085] Step S120: Determine the current operating mode based on the current heating cycle.

[0086] In one specific implementation, the operating modes include: air source heat pump standalone operation mode, gas boiler standalone operation mode, air source heat pump and gas boiler parallel operation mode, and air source heat pump and gas boiler series operation mode. If the current heating cycle is the first heating cycle (early winter or early spring) or the second heating cycle (early winter to mid-winter), the system determines whether to enter the air source heat pump standalone operation mode or the gas boiler standalone operation mode based on the current gas price, electricity price, and the average outdoor temperature of the day. If the current heating cycle is the third heating cycle (mid-winter to late winter), the system determines whether to enter the air source heat pump and gas boiler parallel operation mode. If the current heating cycle is the fourth heating cycle (late winter), the system determines whether to enter the air source heat pump and gas boiler series operation mode.

[0087] If the current heating season is the first heating cycle, the decision to switch between air source heat pump standalone mode and gas boiler standalone mode will be made based on current gas and electricity prices and the average outdoor temperature of the day. Specifically, the current COP (Coefficient of Performance) of the gas boiler equivalent heat pump will be calculated based on current gas and electricity prices. f And obtain the COP of the air source heat pump corresponding to the average outdoor temperature of the day; based on the calculated COP of the current gas boiler equivalent heat pump.f The system uses the average outdoor temperature of the day and the corresponding COP (Coefficient of Performance) of the air-source heat pump to determine the current operating mode. Specifically, it determines the current COP of the gas-fired boiler's equivalent heat pump. f Is it greater than the COP of the air source heat pump corresponding to the average outdoor temperature of the day? If the current gas boiler's equivalent heat pump COP... f If the COP of the air source heat pump is greater than the average outdoor temperature of the day, then the system will enter the gas boiler stand-alone operation mode; otherwise, the system will enter the air source heat pump stand-alone operation mode.

[0088] In one specific implementation, the equivalent heat pump efficiency ratio (COP) of the gas-fired boiler is... f =(Gas calorific value gg / Electricity calorific value gd) × (Electricity price Md / Gas price Mg) × Gas heat source efficiency n. The gas calorific value gg, electricity calorific value gd, electricity price Md, and gas price Mg are constant values ​​for the same region. In one specific embodiment, different average outdoor temperatures correspond to different air source heat pump energy efficiency ratios (COPs). The correspondence between different average outdoor temperatures and different air source heat pump COPs can be preset. Based on this correspondence, the air source heat pump COP corresponding to the average outdoor temperature of the day can be determined.

[0089] Step S130: Control the heating system to enter a defined operating mode.

[0090] In one specific implementation, if it is determined that the air source heat pump is entering a stand-alone operation mode, the group of air source heat pumps with the shortest cumulative operating time is activated, and correspondingly, one heat pump water pump with the shortest cumulative operating time is activated. Specifically, one main unit of this group of air source heat pumps is activated first. Preferably, the heat pump water pump with the shortest cumulative operating time is activated at a preset minimum frequency, and one main unit of this group of air source heat pumps is activated at a preset minimum heat pump frequency.

[0091] For example, combining Figure 3 As shown, the sixth control valve F6 is open, while the first control valve F1, the second control valve F2, the fifth control valve F5, and the seventh control valve F7 are closed. The control valve with the shortest cumulative operating time is opened (the equipment to be opened is determined based on the cumulative operating time, which can balance the service life of the equipment and reduce the failure rate). One heat pump with the shortest cumulative operating time is opened at the lowest frequency, and one main unit in the group corresponding to the control valve with the shortest cumulative operating time is opened at the lowest frequency. The control valve with the shortest operating time can be determined by the number of times it is opened.

[0092] In one specific implementation, if it is determined that the gas-fired boilers will enter a stand-alone operation mode, the group of gas-fired boilers with the shortest cumulative operating time will be turned on, and correspondingly, one boiler water pump with the shortest cumulative operating time will be turned on. Specifically, one boiler in this group will be turned on first. Preferably, the boiler water pump with the shortest cumulative operating time will be turned on at a preset minimum frequency, and one boiler in this group will be turned on at a preset minimum load rate.

[0093] For example, combining Figure 4 As shown, the third, fourth, fifth and sixth control valves (F3~F6) are closed, the control valve with the shortest cumulative running time (e.g., electric butterfly valve F1) is opened, the boiler water pump with the shortest cumulative running time is opened at the lowest frequency, and the boiler in the group corresponding to electric butterfly valve F1 is opened at the lowest load rate.

[0094] In one specific implementation, if it is determined that the air source heat pump and gas boiler are to enter a parallel operation mode, then the group of air source heat pumps and the group of gas boilers with the shortest cumulative operating time are activated, and correspondingly, one heat pump water pump and one boiler water pump with the shortest cumulative operating time are activated. Specifically, one main unit of the air source heat pump group and one gas boiler of the gas boiler group are activated first. Preferably, the heat pump water pump and the boiler water pump with the shortest cumulative operating time are activated at a preset minimum frequency.

[0095] For example, combining Figure 5 As shown, the sixth control valve F6 and the seventh control valve F7 (electric butterfly valves F6 and F7) are opened, the fifth control valve F5 (electric butterfly valve F5) is closed, the control valve with the shortest cumulative running time is opened, and one heat pump and one boiler pump with the shortest cumulative running time are opened at the lowest frequency. One heat source device in each group corresponding to the control valve with the shortest cumulative running time (e.g., electric butterfly valves F1 and F3) is opened, and the system enters the parallel operation mode.

[0096] In one specific implementation, if it is determined that the air source heat pump and gas boiler are to be operated in series, then the group of air source heat pumps and the group of gas boilers with the shortest cumulative operating time are turned on, and correspondingly, one heat pump water pump with the shortest cumulative operating time is turned on. Specifically, one main unit of the air source heat pump group and one gas boiler of the gas boiler group are turned on first. Preferably, the heat pump water pump with the shortest cumulative operating time is turned on at a preset minimum frequency.

[0097] For example, combining Figure 6As shown, the fifth control valve F5 (electric butterfly valve F5) is opened, the sixth control valve F6 and the seventh control valve F7 (electric butterfly valves F6 and F7) are closed, the electric butterfly valves F1 and F3 with the shortest cumulative running time are opened, and one heat pump with the shortest cumulative running time is opened at the lowest frequency. One heat source device in each group corresponding to the control valve with the shortest cumulative running time (e.g., electric butterfly valves F1 and F3) is opened, and the system enters the series operation mode.

[0098] Step S140: Based on the current COP of the air source heat pump and the COP of the equivalent heat pump of the gas boiler... f And the current supply water temperature and / or return water temperature, to perform loading or unloading of air source heat pumps and / or gas boilers.

[0099] If the air source heat pump is currently in stand-alone operation mode, it will determine in real time whether the COP of the air source heat pump corresponding to the current average outdoor temperature is greater than the COP of the equivalent heat pump of the gas boiler. f And whether the current supply water temperature and / or return water temperature meet the preset requirements; if it is determined that the COP of the air source heat pump corresponding to the current average outdoor temperature is greater than the COP of the equivalent heat pump of the gas boiler. f If the current supply water temperature and / or return water temperature of the air source heat pump does not meet the preset requirements and remains so for a first preset time, then the air source heat pump loading step is executed. Specifically, it is determined whether the temperature difference between the current main supply water temperature and the main return water temperature of the air source heat pump is less than or equal to a preset fourth supply-return water temperature difference threshold. If the temperature difference is determined to be less than or equal to the preset fourth supply-return water temperature difference threshold (not greater than the preset fourth supply-return water temperature difference threshold), then it is determined that the current supply water temperature and / or return water temperature meets the preset requirements. Further, if it is determined that the COP of the air source heat pump corresponding to the current average outdoor temperature is greater than the COP of the equivalent heat pump of the gas boiler... f If the temperature difference is less than or equal to the preset fourth supply and return water temperature difference threshold and greater than or equal to the preset third supply and return water temperature difference threshold, then the current operating state remains unchanged; if it is determined that the COP of the air source heat pump corresponding to the current outdoor average temperature is greater than the COP of the equivalent heat pump of the gas boiler, then the current operating state remains unchanged. f If the temperature difference is less than a preset third supply and return water temperature difference threshold, the heating system enters a standby state. When all at least two air source heat pumps are running, if the current supply water temperature or return water temperature is higher than the set temperature by a preset temperature value and remains higher for a second preset time, the air source heat pump unloading step is executed.

[0100] For example, if the system is currently in standby mode for the air source heat pump, it continuously checks whether the air source heat pump's energy efficiency is still greater than the equivalent heat pump energy efficiency ratio (COP) of the gas boiler. If the air source heat pump's energy efficiency is still greater than the equivalent heat pump energy efficiency ratio (COP) of the gas boiler, and the supply and return water temperatures do not meet the preset requirements, then the air source heat pump loading step is executed. Specifically, it checks whether the temperature difference between the current main supply water temperature T4 and the main return water temperature T3 is less than or equal to a preset fourth supply and return water temperature difference threshold ΔT4. If the temperature difference is less than or equal to the preset fourth supply and return water temperature difference threshold ΔT4, then the current supply water temperature and / or return water temperature meets the preset requirements. If the temperature difference is less than or equal to the preset fourth supply and return water temperature difference threshold ΔT4 and greater than or equal to the preset third supply and return water temperature difference threshold ΔT3, then the current operating state remains unchanged; if the temperature difference is less than the preset third supply and return water temperature difference threshold ΔT3, then the heating system enters standby mode. (The supply and return water temperatures T3 and T4 are adjustable within the range of 30~60℃, and the supply and return water temperature difference thresholds ΔT3 and ΔT4 are adjustable within the range of -10~10℃).

[0101] The specific steps for loading the air source heat pumps may include: first loading the frequency of each unit in each group of air source heat pumps to a first preset frequency, and then loading them to a second preset frequency. That is, first loading the frequency of each unit in one group of air source heat pumps to the first preset frequency, and then to the second preset frequency; then loading the frequency of each unit in another group of air source heat pumps to the first preset frequency, and then to the second preset frequency, and so on, until the frequency of each unit in all groups of air source heat pumps is loaded to the second preset frequency. The first preset frequency may be a preset optimal frequency; the second preset frequency may be a preset full-load frequency. During loading, the corresponding water pumps are synchronously frequency-increased according to pressure or temperature difference. (When user demand decreases, the terminal valve closes, the flow rate in the main pipeline increases, leading to a larger pressure difference; in this case, the water pump frequency decreases synchronously, and vice versa. When user demand decreases, the terminal valve closes, the return water temperature decreases (the terminal doesn't need as much cooling capacity), leading to a smaller temperature difference; in this case, the water pump frequency decreases synchronously, and vice versa.) The process involves first starting the corresponding heat pump, then opening the corresponding control valve, and then starting the system. For every decrease in pressure difference or increase in temperature difference by a preset value, the frequency of the corresponding water pump increases by a preset value. When the corresponding water pump reaches the preset full-load frequency, if it cannot meet the requirements for independent operation of the air source heat pump (when all main units of all groups of air source heat pumps are loaded to full-load frequency, the supply water temperature and / or return water temperature still do not meet the preset requirements), the system switches to a parallel operation mode of the air source heat pump and the gas boiler.

[0102] For example, in the first group, the first main unit is loaded to the optimal frequency before the next unit is loaded, and so on, until all units are loaded to the optimal frequency. Then, the second group is started (the pump is started first, then the valve is opened, and then the unit is started to prevent low flow alarms). After the second group is fully loaded to the optimal frequency, the first and second groups of main units are loaded to full load simultaneously. If both groups of water pumps are running at full frequency (the water pumps also increase their frequency synchronously according to the pressure difference or temperature difference while the main units are loaded), the heat pump cannot meet the heating requirements alone (when all main units in all groups of air source heat pumps are loaded to the full load frequency, the supply water temperature and / or return water temperature still do not meet the preset requirements). The mode is corrected to enter the parallel operation mode of the heat pump and boiler (considering that the energy efficiency of the heat pump is still higher than the equivalent energy efficiency ratio (COP) of the boiler at this time, it does not enter the boiler-only heating mode separately).

[0103] The specific steps for implementing air source heat pump unloading may include: first, shutting down the main unit of the group of air source heat pumps with the longest cumulative operating time, then closing the corresponding control valve, and then shutting down one heat pump water pump.

[0104] For example, when two heat pumps are running, if the water supply temperature is higher than the set temperature by a certain value and meets the time interval (adjustable from 0 to 30 minutes), the load reduction step is entered. First, the main unit of the group that has been running for a longer time is shut down (the main units in this group are shut down one by one after the frequency is reduced to the minimum). Then, the corresponding electric butterfly valve is closed, and then the corresponding group of water pumps is shut down. When only one group of water pumps is running, one is kept on standby when the load is reduced to the minimum frequency and is not shut down (when only one group of heat pumps is running in the system, in order to prevent the system from frequently switching on and off, at least one heat pump and water pump must be in the on state).

[0105] If the gas boiler is currently in standby mode, it will determine in real time whether the COP of the air source heat pump corresponding to the current average outdoor temperature is less than the COP of the gas boiler's equivalent heat pump. f And whether the current supply water temperature and / or return water temperature meet the preset requirements; if it is determined that the COP of the air source heat pump corresponding to the current average outdoor temperature is less than the COP of the equivalent heat pump of the gas boiler. f If the current supply water temperature and / or return water temperature does not meet the preset requirements and remains so for a first preset time, then the gas boiler loading step is executed. When all at least two sets of gas boilers are running, if the current supply water temperature or return water temperature is higher than the set temperature by a preset temperature value and remains so for a second preset time, then the gas boiler unloading step is executed. Specifically, it is determined whether the temperature difference between the current main supply water temperature and the main return water temperature of the gas boiler is less than or equal to a preset second supply and return water temperature difference threshold. If the temperature difference is determined to be less than or equal to the preset second supply and return water temperature difference threshold, then the current supply water temperature and / or return water temperature is determined to meet the preset requirements. Further, if it is determined that the COP of the air source heat pump corresponding to the current average outdoor temperature is less than the COP of the equivalent heat pump of the gas boiler... fIf the temperature difference is less than or equal to a preset second supply and return water temperature difference threshold and greater than or equal to a preset first supply and return water temperature difference threshold, then the current operating state remains unchanged; if it is determined that the COP of the air source heat pump corresponding to the current outdoor average temperature is less than the COP of the equivalent heat pump of the gas boiler, then the current operating state remains unchanged. f If the temperature difference is less than the preset first supply and return water temperature difference threshold, the heating system enters standby mode.

[0106] The specific steps for loading the gas-fired boilers may include: first, loading the load of each boiler in each group of gas-fired boilers to a first preset load rate, and then loading them to a second preset load rate. That is, first loading the load rate of each boiler in one group of gas-fired boilers to the first preset load rate, then to the second preset load rate, then loading the load rate of each boiler in another group of gas-fired boilers to the first preset load rate, then to the second preset load rate, and so on, until the load rate of all boilers in all groups of gas-fired boilers is loaded to the second preset load rate. The first preset load rate can be a preset percentage of the preset maximum load rate (full load); the second preset load rate can be the preset maximum load rate. During loading, the corresponding water pumps are synchronously frequency-increased according to the pressure difference or temperature difference. Specifically, the corresponding boiler water pump is started first, then the corresponding control valve is opened, then the boiler is started. For every decrease in pressure difference or increase in temperature difference by a preset value, the frequency of the corresponding water pump increases by a preset value. When the corresponding water pump is turned on and its frequency is increased to the preset full-load frequency, if it cannot meet the requirements for the gas boiler to operate alone (when all gas boilers in all groups of gas boilers are loaded to the full-load frequency, the supply water temperature and / or return water temperature still do not meet the preset requirements), then the operation mode of the air source heat pump and the gas boiler in parallel is switched.

[0107] For example, in the first group, the first boiler is loaded to 90% of its maximum load rate before the next boiler is loaded, and so on, until all boilers in the group are loaded to 90% of their maximum load rate. Then the second group is started (the pump is started first, then the valve is started, then the boiler is started). After all boilers in the second group are loaded to 90% of their maximum load rate, the first and second groups of boilers are loaded to full load (maximum load rate) simultaneously. If both groups of water pumps are running at full frequency (the water pumps also increase their frequency synchronously according to the pressure difference or temperature difference while the boilers are being loaded), the boiler cannot meet the heating requirements alone. Therefore, the mode is adjusted to enter the parallel operation mode of the heat pump and the boiler.

[0108] The specific steps for reducing the load on gas-fired boilers may include: first, shutting down each boiler in the group of gas-fired boilers with the longest cumulative operating time, then closing the corresponding control valves, and then shutting down one boiler water pump.

[0109] For example, when two sets of boilers are running, if the water supply temperature is higher than the set temperature by a certain value and meets the time interval (adjustable from 0 to 30 minutes), the load reduction step is entered. First, the boilers in the set that have been running for a longer time are shut down (the boilers in the set are shut down one by one after the load rate is reduced to the minimum). Then, the corresponding control valve is closed, and then one set of water pumps is shut down. When only one set of boilers is running, one boiler is kept on standby when the load is reduced to the minimum frequency and is not shut down (when only one set of boilers is running in the system, in order to prevent the system from frequently switching on and off, at least one boiler and water pump must be in the on state).

[0110] If the air source heat pump and gas boiler are currently operating in parallel, it will be determined in real time whether the current COP of the air source heat pump is greater than or equal to the COP of the gas boiler's equivalent heat pump. f And whether the current supply water temperature and / or return water temperature meet the preset requirements; if it is determined that the current air source heat pump energy efficiency ratio (COP) is greater than or equal to the equivalent heat pump energy efficiency ratio (COP) of the gas boiler. f If the current supply water temperature and / or return water temperature do not meet the preset requirements and remain so for a first preset time, then the air source heat pump loading step is executed first, followed by the gas boiler loading step. The execution of the air source heat pump loading step and the gas boiler loading step are the same as in the aforementioned embodiments. If it is determined that the current air source heat pump energy efficiency ratio (COP) is less than the equivalent heat pump energy efficiency ratio (COP) of the gas boiler, then... f If the current supply water temperature and / or return water temperature do not meet the preset requirements and remain so for a first preset time, then the gas boiler loading step is executed first, followed by the air source heat pump loading step. Specifically, it is determined whether the temperature difference between the current heating main supply water temperature and the heating main return water temperature is less than or equal to a preset sixth supply-return water temperature difference threshold. If the temperature difference is determined to be less than or equal to the preset sixth supply-return water temperature difference threshold (not greater than the preset sixth supply-return water temperature difference threshold), then the current supply water temperature and / or return water temperature is determined to meet the preset requirements. Further, if it is determined that the COP of the air source heat pump corresponding to the current average outdoor temperature is less than the COP of the equivalent heat pump of the gas boiler... f If the temperature difference is less than or equal to the preset sixth supply and return water temperature difference threshold and greater than or equal to the preset fifth supply and return water temperature difference threshold, then the current operating state remains unchanged; if it is determined that the COP of the air source heat pump corresponding to the current outdoor average temperature is less than the COP of the equivalent heat pump of the gas boiler, then the current operating state remains unchanged. f If the temperature difference is less than the preset fifth supply and return water temperature difference threshold, the heating system enters standby mode. The air source heat pump loading step and the gas boiler loading step are the same as in the previous embodiments. When all at least two air source heat pumps are loaded to the preset full-load frequency and all at least two gas boilers are loaded to the maximum load rate, if the current supply and return water temperatures still do not meet the preset requirements, the system enters a series operation mode of the air source heat pump and gas boiler.

[0111] If the current supply water temperature or return water temperature is higher than the set temperature by a preset value and remains higher for a second preset time, then the air source heat pump load reduction step and / or the gas boiler load reduction step will be executed. Specifically, based on the current COP of the air source heat pump and the equivalent heat pump COP of the gas boiler, if the current COP of the air source heat pump is less than the equivalent heat pump COP of the gas boiler... f If the air source heat pump load reduction step is executed first, followed by the gas boiler load reduction step, then the air source heat pump load reduction step is executed. The execution of the air source heat pump load reduction step and the gas boiler load increase step are the same as in the previous embodiments. If the current air source heat pump COP is greater than or equal to the gas boiler's equivalent heat pump COP... f If the gas boiler is unloaded first, then the air source heat pump is unloaded. The unloading steps for the air source heat pump and the gas boiler are the same as in the previous embodiments. Further, when both air source heat pumps are unloaded to a preset minimum load frequency, both gas boilers are unloaded to a minimum load rate, and the corresponding water pump frequency is reduced to a preset minimum frequency, the system enters either the air source heat pump stand-alone operation mode or the gas boiler stand-alone operation mode.

[0112] For example, the loading process is as follows: In real time, it is determined whether the COP of the heat pump is higher than that of the gas boiler. If it is lower and the supply and return water temperatures do not meet the requirements, the gas boiler is loaded first, and the heat pump is loaded otherwise. If the supply and return water temperatures still do not meet the requirements after the entire system is loaded to full capacity, the system enters the series operation mode.

[0113] Load reduction steps: Prioritize reducing the load on systems with low energy efficiency. When both the heat pump system and the boiler system are reduced to their minimum load and the water pump frequency is reduced to its lowest level, determine whether to enter the air source heat pump stand-alone mode or the gas boiler stand-alone mode based on the current COP of the air source heat pump and the equivalent COP of the gas boiler. If the current COP of the air source heat pump is greater than or equal to the equivalent COP of the gas boiler, then enter the air source heat pump stand-alone mode. If the current COP of the air source heat pump is less than the equivalent COP of the gas boiler, then enter the gas boiler stand-alone mode.

[0114] If the system is currently operating in series with the gas-fired boiler, it will continuously determine whether the current COP of the air-source heat pump is greater than or equal to the COP of the gas-fired boiler. f And whether the current supply water temperature and / or return water temperature meet the preset requirements; if it is determined that the current air source heat pump energy efficiency ratio (COP) is greater than or equal to the equivalent heat pump energy efficiency ratio (COP) of the gas boiler. fIf the current supply water temperature and / or return water temperature do not meet the preset requirements and remain so for a first preset time, then the air source heat pump loading step is executed first, followed by the gas boiler loading step. The execution of the air source heat pump loading step and the gas boiler loading step are the same as in the aforementioned embodiments. If it is determined that the current air source heat pump energy efficiency ratio (COP) is less than the equivalent heat pump energy efficiency ratio (COP) of the gas boiler, then... f If the current supply water temperature and / or return water temperature do not meet the preset requirements and remain so for a first preset time, then the gas boiler loading step is executed first, followed by the air source heat pump loading step. The execution of the air source heat pump loading step and the gas boiler loading step are the same as in the aforementioned embodiments. It is determined whether the temperature difference between the current heating main supply water temperature and the heating main return water temperature is less than or equal to a preset sixth supply-return water temperature difference threshold. If the temperature difference is determined to be less than or equal to the preset sixth supply-return water temperature difference threshold (not greater than the preset sixth supply-return water temperature difference threshold), then the current supply water temperature and / or return water temperature is determined to meet the preset requirements. Further, if it is determined that the COP of the air source heat pump corresponding to the current average outdoor temperature is less than the COP of the equivalent heat pump of the gas boiler... f If the temperature difference is less than or equal to the preset sixth supply and return water temperature difference threshold and greater than or equal to the preset fifth supply and return water temperature difference threshold, then the current operating state remains unchanged; if it is determined that the COP of the air source heat pump corresponding to the current outdoor average temperature is less than the COP of the equivalent heat pump of the gas boiler, then the current operating state remains unchanged. f If the temperature difference is less than the preset fifth supply and return water temperature difference threshold, the heating system enters standby mode.

[0115] If the current supply water temperature or return water temperature is higher than the set temperature by a preset value and remains higher for a second preset time, then an air source heat pump load reduction step or a gas boiler load reduction step will be executed. Specifically, based on the current COP of the air source heat pump and the equivalent heat pump COP of the gas boiler, if the current COP of the air source heat pump is less than the equivalent heat pump COP of the gas boiler... f If the air source heat pump load reduction step is executed first, followed by the gas boiler load reduction step, then the air source heat pump load reduction step is executed. The execution of the air source heat pump load reduction step and the gas boiler load increase step are the same as in the previous embodiments. If the current air source heat pump COP is greater than or equal to the gas boiler's equivalent heat pump COP... f If the gas boiler is unloaded first, then the air source heat pump is unloaded. The unloading steps for the air source heat pump and the gas boiler are the same as in the previous embodiments. Further, when both air source heat pumps are unloaded to a preset minimum load frequency, both gas boilers are unloaded to a minimum load rate, and the corresponding water pump frequency is reduced to a preset minimum frequency, the system enters a parallel operation mode for the air source heat pump and the gas boiler.

[0116] For example, the loading process involves: real-time determination of whether the heat pump efficiency is higher than the equivalent energy efficiency ratio (COP) of the gas boiler; if it is lower and the supply and return water temperatures do not meet the requirements, the gas boiler is loaded first, and vice versa. Since the main pipe setting temperature is fixed, the return water is first preheated by the heat pump and then heated in two stages by the gas boiler. The higher the supply water temperature, the lower the heat pump efficiency. The optimal operating mode is achieved by real-time detection of the efficiency of the two heat sources.

[0117] Load reduction steps: Prioritize reducing the load on systems with low energy efficiency. When both the heat pump and boiler systems are reduced to the minimum load and the water pump frequency is reduced to the minimum, they enter parallel operation mode.

[0118] The heating system of this invention is not limited to single-unit control in a single building or a single machine room, but can be constructed into a regional distributed heating cluster. For example, multiple "heat pump + boiler" series-parallel terminal nodes located in different buildings or areas can be connected to a cloud control platform through an Internet of Things (IoT) gateway to achieve control.

[0119] Figure 9 This is a schematic diagram of another embodiment of the control method for the heating system provided by the present invention.

[0120] like Figure 9 As shown, according to another embodiment of the present invention, the control method of the heating system further includes steps S150, S152 and S154.

[0121] Step S150: When the heating system is running in parallel operation mode of air source heat pump and gas boiler or in series operation mode of air source heat pump and gas boiler, determine whether the air source heat pump will frost based on the outdoor environmental parameters within a preset time period in the future.

[0122] Specifically, weather information can be obtained via the internet to acquire outdoor environmental parameters for a preset future time period. These parameters may include outdoor ambient temperature, outdoor relative humidity, and freezing point temperature. Based on these parameters, it can be predicted whether the heat pump will frost. For example, if the outdoor relative humidity is greater than a set humidity value and the difference between the outdoor ambient temperature and the freezing point temperature meets a set difference requirement, it can be determined that the air source heat pump may be about to frost.

[0123] Step S152: If it is determined that the air source heat pump will frost, and the COP of the gas boiler equivalent heat pump is... f If the air source heat pump defrost efficiency ratio (COP) is greater than the average outdoor temperature within the preset future time period, then the air source heat pump will be unloaded and the gas boiler will be loaded.

[0124] Step S154: If it is determined that the air source heat pump will frost, and the COP of the gas boiler equivalent heat pump is... fIf the air source heat pump defrost efficiency ratio (COP) is not greater than the outdoor temperature within the preset future time period, the air source heat pump will no longer be loaded.

[0125] Figure 10 This is a schematic diagram illustrating the defrosting control process based on outdoor environmental parameters, operating in series or parallel with an air source heat pump and a gas-fired boiler. (Example:) Figure 10 As shown, based on the networked weather warning, the system analyzes the current state of the heat pump and combines it with the outdoor temperature and humidity, water vapor partial pressure, and freezing point temperature for the next period to predict whether the heat pump will frost. It also compares the equivalent energy efficiency of the gas boiler with the defrosting energy efficiency of the heat pump. When the heat pump energy efficiency is high, the heat pump system energy efficiency will decrease due to the defrosting process in the next stage, so the heat pump output will not be increased. It will be increased again after defrosting is completed. If the temperature is not met at this time, the boiler will be loaded first until defrosting is completed. When the boiler energy efficiency is high, the heat pump output will be reduced and the gas boiler output will be increased.

[0126] In another embodiment of the present invention, the control method of the heating system further includes: determining whether the indoor temperature at the farthest end is less than the sum of the indoor set temperature and the preset temperature, or whether the temperature difference between the supply water temperature and the return water temperature of the heating main pipe is greater than a preset temperature difference threshold, and whether the capacity of all devices in the current operating mode has reached its maximum; if it is determined that the indoor temperature at the farthest end is less than the sum of the indoor set temperature and the preset temperature, or the temperature difference between the supply water temperature and the return water temperature of the heating main pipe is greater than the preset temperature difference threshold, and the capacity of all devices in the current operating mode has reached its maximum, and this continues for a third preset time, then the system enters the next stage of the operating mode, that is, the operating mode corresponding to the next heating cycle; otherwise, it determines... The system determines whether the indoor temperature at the furthest point is greater than the sum of the indoor set temperature and the preset temperature, or whether the temperature difference between the supply and return water temperatures of the heating main is less than the preset temperature difference threshold, and whether the capacity of all equipment (air source heat pump and / or gas boiler) in the current operating mode has reached its minimum and has remained so for a third preset time. If the indoor temperature at the furthest point is greater than the indoor set temperature, or the temperature difference between the supply and return water temperatures of the heating main is less than the preset temperature difference threshold, and the capacity of all equipment (air source heat pump and / or gas boiler) in the current operating mode has reached its minimum and has remained so for a third preset time, then the system enters the previous stage operating mode, i.e., the operating mode corresponding to the previous heating cycle.

[0127] The above embodiments can be referred to. Figure 11 The diagram shows a modified operating mode for a hybrid heating system combining an air source heat pump and a gas boiler. Figure 11As shown, if the indoor temperature or supply and return water temperature does not meet the requirements after a period of time in the current operating mode, and all equipment outputs reach the maximum (all are loaded to the maximum load), then the next stage (the operating mode of the next heating cycle) will be entered, and the settings for the operating heating cycle will be corrected. At the same time, if the supply water temperature or indoor temperature is too high, and the equipment capacity is turned to the minimum, after a period of time, the previous stage operating mode (the operating mode of the previous heating cycle) can be entered.

[0128] Figure 12 This is a diagram illustrating mode switching in case of equipment failure in a hybrid heating system combining an air source heat pump and a gas boiler. Figure 12 As shown, priority is given to increasing the output of non-faulty units and equipment within the group. If there is no flow water path in the series mode, the operation mode is switched to parallel mode. If the water pump also fails, the matching unstarted or standby water pump is operated first. If some air source heat pumps or gas boilers malfunction, in the parallel operation mode of air source heat pumps and gas boilers, the output (load) of non-faulty units (non-faulty air source heat pumps or gas boilers) will be increased based on the priority of optimal energy efficiency. In the series operation mode of air source heat pumps and gas boilers, it will be determined whether there is at least one series branch. If not, it will switch to the parallel operation mode of air source heat pumps and gas boilers. If there is, and the non-faulty units (non-faulty air source heat pumps or gas boilers) are fully operational but still do not meet the requirements, it will enter the parallel operation mode of air source heat pumps and gas boilers. If it is not operating in the series or parallel operation mode of air source heat pumps or gas boilers, and the non-faulty units (non-faulty air source heat pumps or gas boilers) are fully operational but still do not meet the requirements, it will enter the parallel operation mode. If there is no fault, it will remain unchanged. If all air source heat pumps and gas boilers malfunction, an alert will be issued, for example, by sending an alert to the user and after-sales service provider for repair.

[0129] To clearly illustrate the technical solution of the present invention, the execution flow of the control method for the heating system provided by the present invention will be described below with reference to a specific embodiment.

[0130] Figure 13A and Figure 13B This is a flowchart illustrating a specific embodiment of the control method for a heating system provided by the present invention. Figure 13A This diagram illustrates a portion of the heating cycle during early winter / early spring and early to mid-winter. Figure 13B This diagram illustrates a portion of the process during the middle to late winter of the heating cycle; for example... Figure 13A and Figure 13B As shown, by setting different heating cycle stages and heating temperatures, the initial operating mode is determined by comparing the equivalent energy efficiency ratio (COP) of the gas boiler with the energy efficiency of the input heat pump. Then, the operating mode is corrected based on the actual operating heat pump energy efficiency, prioritizing the loading of systems with high energy efficiency. At the same time, the modes can be switched automatically.

[0131] Set the initial heating main water supply temperature T6 for different cycle periods, determine which stage of the heating cycle it is in among the four stages of early winter / early spring, early winter to mid-winter, mid-winter to late winter, and late winter, and set the heat pump stand-alone operation mode, gas boiler stand-alone operation mode, air source heat pump and gas boiler parallel operation mode, and air source heat pump and gas boiler parallel and series operation mode according to the operation stage.

[0132] If the heating season falls in early spring / early winter (e.g., mid-October to mid-November, early March to early April) or early to mid-winter (e.g., mid-November to mid-December), set the main heating pipe supply temperature T6 (adjustable from 30 to 100℃) for that heating season, and determine the equivalent energy efficiency ratio (COP) of the gas-fired boiler. f If the input energy efficiency ratio (COP) of the gas boiler is greater than the average outdoor temperature of today, the gas boiler will enter the gas boiler stand-alone operation mode; otherwise, the air source heat pump will enter the air source heat pump stand-alone operation mode.

[0133] If the air source heat pump enters the stand-alone operation mode, the electric butterfly valve F6 will be opened, and the electric butterfly valves F1, F2, F5, and F7 will be closed. The electric butterfly valve with the shortest cumulative operating time (e.g., F3) will be opened, and the heat pump mini pump with the shortest cumulative operating time will be opened at the lowest frequency. The main unit in the group corresponding to the electric butterfly valve with the shortest cumulative operating time (e.g., F3) will be opened at the lowest frequency.

[0134] The system continuously monitors whether the heat pump's energy efficiency is still greater than or equal to the equivalent energy efficiency ratio (COP) of the gas boiler. If it is, and the supply and return water temperatures do not meet the requirements, it checks whether the temperature difference between the current main supply water temperature T4 and the main return water temperature T3 of the air source heat pump is less than or equal to a preset fourth supply and return water temperature difference threshold ΔT4. If the temperature difference is less than or equal to the preset fourth supply and return water temperature difference threshold ΔT4, then the current supply water temperature and / or return water temperature meets the preset requirements. If the temperature difference is less than or equal to the preset fourth supply and return water temperature difference threshold ΔT4 and greater than or equal to the preset third supply and return water temperature difference threshold ΔT3, then the current operating state remains unchanged. If the temperature difference is determined to be less than the preset third supply and return water temperature difference threshold ΔT3, the heating system enters standby mode. Then, the loading process begins: the first main unit in the first group is loaded to the optimal frequency before the next unit is loaded, until all units are loaded to the optimal frequency. Then, the second group is started (the pump is started first, then the valve is opened, then the unit is started to prevent low flow alarms). After the second group is fully loaded to the optimal frequency, both groups are then fully loaded. Simultaneously with loading the main units, the water pumps also synchronously increase their frequency according to the pressure difference or temperature difference. If all water pumps are running at full frequency, the heat pump cannot meet the individual heating requirements, and the system enters a parallel operation mode between the heat pump and the boiler through mode correction.

[0135] If the gas boiler enters the standby heating mode, electric butterfly valves F3~F6 will be closed, and the electric butterfly valve with the shortest cumulative running time (e.g., F1) will be opened. The boiler's main water pump with the shortest cumulative running time will be opened at the lowest frequency, and the boiler in the group corresponding to the electric butterfly valve with the shortest cumulative running time (e.g., F1) will be opened at the lowest load rate.

[0136] The system continuously monitors whether the heat pump efficiency ratio is still greater than or equal to the equivalent energy efficiency ratio (COP) of the gas boiler. If it is less than or equal to the COP, and the supply and return water temperatures do not meet the requirements (it checks whether the temperature difference between the current main supply water temperature and the main return water temperature of the gas boiler is less than or equal to a preset second supply and return water temperature difference threshold ΔT2; if the temperature difference is less than or equal to the preset second supply and return water temperature difference threshold ΔT2, then it determines that the current supply water temperature and / or return water temperature meet the preset requirements). Further, if it is determined that the air source heat pump efficiency ratio (COP) corresponding to the current average outdoor temperature is less than the equivalent heat pump efficiency ratio (COP) of the gas boiler... f If the temperature difference is less than or equal to the preset second supply and return water temperature difference threshold ΔT2 and greater than or equal to the preset first supply and return water temperature difference threshold ΔT1, then the current operating state remains unchanged; if it is determined that the COP of the air source heat pump corresponding to the current outdoor average temperature is less than the COP of the equivalent heat pump of the gas boiler, then the current operating state remains unchanged. f If the temperature difference is less than the preset first supply and return water temperature difference threshold ΔT1, the heating system enters standby mode. Then, the loading step is executed: the first boiler in the first group is loaded to 90% of its maximum load rate before the next boiler is loaded, until all boilers in the group are loaded to 90%. Then, the second group is started (first the pump, then the valve, then the boiler). After the second group is fully loaded to 90% of its maximum load rate, both groups are then fully loaded. If both pumps are running at full frequency (the pumps also increase frequency synchronously according to pressure difference or temperature difference while the boilers are being loaded), the boiler cannot meet the individual heating requirements. The system then enters a parallel operation mode of the heat pump and boiler through mode correction. When the supply water temperature is higher than the set temperature by a certain value and a certain time interval is met, the load reduction step is entered. First, the boilers in the group with the longest operating time are shut down (boilers in the group are reduced to the minimum load rate and then shut down one by one), then the electric valve is closed, and then the corresponding group's pump is shut down. When a group is reduced to the minimum frequency, one boiler remains in standby mode and is not shut down.

[0137] During the heating season from mid-winter to late winter (e.g., mid-December to early January), set the main heating pipe supply temperature to T6 (adjustable from 30 to 100℃) for this heating season. Open electric butterfly valves F6 and F7 and close F5. Open the electric butterfly valve with the shortest cumulative operating time (e.g., F1 and F3). Open one heat pump small water pump and one boiler large water pump with the shortest cumulative operating time at the lowest frequency. Open one heat source device in each group corresponding to electric butterfly valves F1 and F3. The system enters the parallel operation mode of air source heat pump and gas boiler.

[0138] The system continuously monitors whether the heat pump's energy efficiency ratio (COP) is greater than that of the gas boiler's equivalent energy efficiency ratio (COP). If it is less, and the supply and return water temperatures do not meet the requirements, the system determines whether the temperature difference T5 between the current heating main supply water temperature T6 and the heating main return water temperature is less than or equal to a preset sixth supply and return water temperature difference threshold ΔT6. If the temperature difference is less than or equal to the preset sixth supply and return water temperature difference threshold ΔT6 (not greater than the preset sixth supply and return water temperature difference threshold), then the current supply water temperature and / or return water temperature meet the preset requirements. Furthermore, if the COP of the air source heat pump corresponding to the current average outdoor temperature is less than the COP of the gas boiler's equivalent heat pump energy efficiency ratio (COP), the system determines that the current supply water temperature and / or return water temperature meet the preset requirements. f If the temperature difference is less than or equal to the preset sixth supply and return water temperature difference threshold ΔT6 and greater than or equal to the preset fifth supply and return water temperature difference threshold ΔT5, then the current operating state remains unchanged; if it is determined that the COP of the air source heat pump corresponding to the current outdoor average temperature is less than the COP of the equivalent heat pump of the gas boiler, then the current operating state remains unchanged. f If the temperature difference is less than the preset fifth supply and return water temperature difference threshold ΔT5, then the heating system enters standby mode. In this case, the gas boiler is loaded first, and the heat pump is loaded otherwise. The gas boiler load rate, number of units, number of groups and boiler water pump (large water pump) are loaded first, and then the heat pump frequency, number of units, number of groups and heat pump water pump (small water pump) are loaded.

[0139] When the heating season is in the depths of winter (e.g., early January to late February), set the main heating pipe supply temperature to T6 for this heating season. Open electric butterfly valves F5 and close F6 and F7. Open the electric butterfly valves with the shortest cumulative operating time (e.g., F1 and F3). Open one heat pump pump with the shortest cumulative operating time at the lowest frequency. Open one heat source device in the group corresponding to the electric butterfly valves with the shortest cumulative operating time (e.g., F1 and F3). The system enters the series operation mode. The system continuously monitors whether the heat pump's energy efficiency ratio (COP) is greater than or equal to that of the gas boiler. If it is less than COP, and the supply and return water temperatures do not meet the requirements, it determines whether the temperature difference T5 between the current heating main supply water temperature T6 and the heating main return water temperature is less than or equal to the preset sixth supply and return water temperature difference threshold ΔT6. If the temperature difference is less than or equal to the preset sixth supply and return water temperature difference threshold ΔT6 (not greater than the preset sixth supply and return water temperature difference threshold), then the current supply water temperature and / or return water temperature meet the preset requirements. Furthermore, if the COP of the air source heat pump corresponding to the current average outdoor temperature is less than the COP of the gas boiler's equivalent heat pump energy efficiency ratio, the system determines whether the current supply and / or return water temperatures meet the preset requirements. f If the temperature difference is less than or equal to the preset sixth supply and return water temperature difference threshold ΔT6 and greater than or equal to the preset fifth supply and return water temperature difference threshold ΔT5, then the current operating state remains unchanged; if it is determined that the COP of the air source heat pump corresponding to the current outdoor average temperature is less than the COP of the equivalent heat pump of the gas boiler, then the current operating state remains unchanged. fIf the temperature difference is less than the preset fifth supply and return water temperature difference threshold ΔT5, then the heating system enters standby mode. In this case, the gas boiler is loaded first, and the heat pump is loaded otherwise. The gas boiler load rate, number of units, and number of groups are loaded first, and then the heat pump frequency, number of units, and number of groups are loaded. The water pump loading order is the heat pump water pump (small water pump) frequency and number of units, and then the boiler water pump (large water pump) frequency and number of units.

[0140] The present invention also provides a control device for a heating system. This device is used in a hybrid heating system combining an air source heat pump and a gas boiler. Preferably, the device can be used in a regional distributed heating cluster, which includes two or more heating systems, and each heating system can be controlled separately. For example, this control method can be implemented on a cloud control platform, where multiple hybrid heating systems combining air source heat pumps and gas boilers located in different buildings or areas are connected to the cloud control platform via an Internet of Things (IoT) gateway and controlled through the cloud control platform.

[0141] Figure 14 This is a structural block diagram of an embodiment of the control device for a heating system provided by the present invention. Figure 14 As shown, the control device 100 of the heating system includes: a first determining unit 110, a second determining unit 120, a control unit 130, and an execution unit 140.

[0142] The first determining unit 110 is used to determine the current heating cycle.

[0143] Specifically, two or more heating cycles are pre-set, each corresponding to a different time range, and the initial target temperature T6 for the main heating pipe supply is set for each heating cycle. The functional cycle includes a first heating cycle, a second heating cycle, a third heating cycle, and a fourth heating cycle. The outdoor temperature decreases sequentially in the first, second, third, and fourth heating cycles.

[0144] For example, four heating cycles can be pre-set according to the season: early winter / early spring, early winter to mid-winter, mid-winter to late winter, and late winter. The first heating cycle is early winter / early spring, the second heating cycle is early winter to mid-winter, the third heating cycle is mid-winter to late winter, and the fourth heating cycle is late winter. For example, the time range of early winter / early spring is mid-October to mid-November / early March to early April; the time range of early winter to mid-winter is mid-November to mid-December; the time range of mid-winter to late winter is mid-December to early January; and the time range of late winter is early January to the end of February. The system determines which of the four heating cycles (early winter / early spring, early winter to mid-winter, mid-winter to late winter, and late winter) the current heating cycle is in, and determines the corresponding initial target temperature for the main heating pipe. In one specific implementation, the initial target temperature for the main heating pipe corresponding to the current heating cycle can be determined based on the pre-set correspondence between the initial target temperatures for the main heating pipe for different heating cycles.

[0145] The second determining unit 120 is used to determine the current operating mode based on the current heating cycle determined by the first determining unit.

[0146] In one specific implementation, the operating modes include: air source heat pump standalone operation mode, gas boiler standalone operation mode, air source heat pump and gas boiler parallel operation mode, and air source heat pump and gas boiler series operation mode. If the current heating cycle is the first heating cycle (early winter or early spring) or the second heating cycle (early winter to mid-winter), the system determines whether to enter the air source heat pump standalone operation mode or the gas boiler standalone operation mode based on the current gas price, electricity price, and the average outdoor temperature of the day. If the current heating cycle is the third heating cycle (mid-winter to late winter), the system determines whether to enter the air source heat pump and gas boiler parallel operation mode. If the current heating cycle is the fourth heating cycle (late winter), the system determines whether to enter the air source heat pump and gas boiler series operation mode.

[0147] If the current heating season is the first heating cycle, the decision to switch between air source heat pump standalone mode and gas boiler standalone mode will be made based on current gas and electricity prices and the average outdoor temperature of the day. Specifically, the current COP (Coefficient of Performance) of the gas boiler equivalent heat pump will be calculated based on current gas and electricity prices. f And obtain the COP of the air source heat pump corresponding to the average outdoor temperature of the day; based on the calculated COP of the current gas boiler equivalent heat pump. f The system uses the average outdoor temperature of the day and the corresponding COP (Coefficient of Performance) of the air-source heat pump to determine the current operating mode. Specifically, it determines the current COP of the gas-fired boiler's equivalent heat pump. f Is it greater than the COP of the air source heat pump corresponding to the average outdoor temperature of the day? If the current gas boiler's equivalent heat pump COP... fIf the COP of the air source heat pump is greater than the average outdoor temperature of the day, then the system will enter the gas boiler stand-alone operation mode; otherwise, the system will enter the air source heat pump stand-alone operation mode.

[0148] In one specific implementation, the equivalent heat pump efficiency ratio (COP) of the gas-fired boiler is... f =(Gas calorific value gg / Electricity calorific value gd) × (Electricity price Md / Gas price Mg) × Gas heat source efficiency n. The gas calorific value gg, electricity calorific value gd, electricity price Md, and gas price Mg are constant values ​​for the same region. In one specific embodiment, different average outdoor temperatures correspond to different air source heat pump energy efficiency ratios (COPs). The correspondence between different average outdoor temperatures and different air source heat pump COPs can be preset. Based on this correspondence, the air source heat pump COP corresponding to the average outdoor temperature of the day can be determined.

[0149] The control unit 130 is used to control the heating system to enter a defined operating mode.

[0150] In one specific implementation, if it is determined that the air source heat pump is entering a stand-alone operation mode, the group of air source heat pumps with the shortest cumulative operating time is activated, and correspondingly, one heat pump water pump with the shortest cumulative operating time is activated. Specifically, one main unit of this group of air source heat pumps is activated first. Preferably, the heat pump water pump with the shortest cumulative operating time is activated at a preset minimum frequency, and one main unit of this group of air source heat pumps is activated at a preset minimum heat pump frequency.

[0151] For example, combining Figure 3 As shown, the sixth control valve F6 is open, while the first control valve F1, the second control valve F2, the fifth control valve F5, and the seventh control valve F7 are closed. The control valve with the shortest cumulative operating time (electric butterfly valve F3) is opened (the equipment to be opened is determined based on the cumulative operating time, which can balance the service life of the equipment and reduce the failure rate). The heat pump with the shortest cumulative operating time is opened at the lowest frequency, and the main unit corresponding to the control valve with the shortest cumulative operating time is opened at the lowest frequency. The control valve with the shortest operating time can be determined by the number of times it is opened.

[0152] In one specific implementation, if it is determined that the gas-fired boilers will enter a stand-alone operation mode, the group of gas-fired boilers with the shortest cumulative operating time will be turned on, and correspondingly, one boiler water pump with the shortest cumulative operating time will be turned on. Specifically, one boiler in this group will be turned on first. Preferably, the boiler water pump with the shortest cumulative operating time will be turned on at a preset minimum frequency, and one boiler in this group will be turned on at a preset minimum load rate.

[0153] For example, combining Figure 4As shown, the third, fourth, fifth and sixth control valves (F3~F6) are closed, the control valve with the shortest cumulative running time (e.g., electric butterfly valve F1) is opened, the boiler water pump with the shortest cumulative running time is opened at the lowest frequency, and the boiler in the group corresponding to electric butterfly valve F1 is opened at the lowest load rate.

[0154] In one specific implementation, if it is determined that the air source heat pump and gas boiler are to enter a parallel operation mode, then the group of air source heat pumps and the group of gas boilers with the shortest cumulative operating time are activated, and correspondingly, one heat pump water pump and one boiler water pump with the shortest cumulative operating time are activated. Specifically, one main unit of the air source heat pump group and one gas boiler of the gas boiler group are activated first. Preferably, the heat pump water pump and the boiler water pump with the shortest cumulative operating time are activated at a preset minimum frequency.

[0155] For example, combining Figure 5 As shown, the sixth control valve F6 and the seventh control valve F7 (electric butterfly valves F6 and F7) are opened, the fifth control valve F5 (electric butterfly valve F5) is closed, the control valve with the shortest cumulative running time is opened, and one heat pump and one boiler pump with the shortest cumulative running time are opened at the lowest frequency. One heat source device in each group corresponding to the control valve with the shortest cumulative running time (e.g., electric butterfly valves F1 and F3) is opened, and the system enters the parallel operation mode.

[0156] In one specific implementation, if it is determined that the air source heat pump and gas boiler are to be operated in series, then the group of air source heat pumps and the group of gas boilers with the shortest cumulative operating time are turned on, and correspondingly, one heat pump water pump with the shortest cumulative operating time is turned on. Specifically, one main unit of the air source heat pump group and one gas boiler of the gas boiler group are turned on first. Preferably, the heat pump water pump with the shortest cumulative operating time is turned on at a preset minimum frequency.

[0157] For example, combining Figure 6 As shown, the fifth control valve F5 (electric butterfly valve F5) is opened, the sixth control valve F6 and the seventh control valve F7 (electric butterfly valves F6 and F7) are closed, the electric butterfly valves F1 and F3 with the shortest cumulative running time are opened, and one heat pump with the shortest cumulative running time is opened at the lowest frequency. One heat source device in each group corresponding to the control valve with the shortest cumulative running time (e.g., electric butterfly valves F1 and F3) is opened, and the system enters the series operation mode.

[0158] Execution unit 140 is used to calculate the current COP of the air source heat pump and the COP of the equivalent heat pump of the gas boiler. f And the current supply water temperature and / or return water temperature, to perform loading or unloading of air source heat pumps and / or gas boilers.

[0159] If the system is currently in stand-alone air source heat pump operation mode, it will continuously determine whether the current COP of the air source heat pump is greater than the COP of the equivalent heat pump of the gas boiler. f And whether the current supply water temperature and / or return water temperature meet the preset requirements; if it is determined that the current COP of the air source heat pump is greater than the COP of the equivalent heat pump of the gas boiler. f If the current supply water temperature and / or return water temperature does not meet the preset requirements and remains so for a first preset time, then the air source heat pump loading step is executed. Specifically, it is determined whether the temperature difference between the current main supply water temperature and the main return water temperature of the air source heat pump is less than or equal to a preset fourth supply-return water temperature difference threshold. If the temperature difference is determined to be less than or equal to the preset fourth supply-return water temperature difference threshold (not greater than the preset fourth supply-return water temperature difference threshold), then it is determined that the current supply water temperature and / or return water temperature meets the preset requirements. Further, if it is determined that the COP of the air source heat pump corresponding to the current average outdoor temperature is greater than the COP of the equivalent heat pump of the gas boiler... f If the temperature difference is less than or equal to the preset fourth supply and return water temperature difference threshold and greater than or equal to the preset third supply and return water temperature difference threshold, then the current operating state remains unchanged; if it is determined that the COP of the air source heat pump corresponding to the current outdoor average temperature is greater than the COP of the equivalent heat pump of the gas boiler, then the current operating state remains unchanged. f If the temperature difference is less than a preset third supply and return water temperature difference threshold, the heating system enters a standby state. When all at least two air source heat pumps are running, if the current supply water temperature or return water temperature is higher than the set temperature by a preset temperature value and remains higher for a second preset time, the air source heat pump unloading step is executed.

[0160] For example, if the system is currently in standby mode for the air source heat pump, it continuously checks whether the air source heat pump's energy efficiency is still greater than the equivalent heat pump energy efficiency ratio (COP) of the gas boiler. If the air source heat pump's energy efficiency is still greater than the equivalent heat pump energy efficiency ratio (COP) of the gas boiler, and the supply and return water temperatures do not meet the preset requirements, then the air source heat pump loading step is executed. Specifically, it checks whether the temperature difference between the current main supply water temperature T4 and the main return water temperature T3 is less than or equal to a preset fourth supply and return water temperature difference threshold ΔT4. If the temperature difference is less than or equal to the preset fourth supply and return water temperature difference threshold ΔT4, then the current supply water temperature and / or return water temperature meets the preset requirements. If the temperature difference is less than or equal to the preset fourth supply and return water temperature difference threshold ΔT4 and greater than or equal to the preset third supply and return water temperature difference threshold ΔT3, then the current operating state remains unchanged; if the temperature difference is less than the preset third supply and return water temperature difference threshold ΔT3, then the heating system enters standby mode. (The supply and return water temperatures T3 and T4 are adjustable within the range of 30~60℃, and ΔT3 and ΔT4 are adjustable within the range of -10~10℃).

[0161] The specific steps for loading the air source heat pumps may include: first loading the frequency of each unit in each group of air source heat pumps to a first preset frequency, and then loading them to a second preset frequency. That is, first loading the frequency of each unit in one group of air source heat pumps to the first preset frequency, and then to the second preset frequency; then loading the frequency of each unit in another group of air source heat pumps to the first preset frequency, and then to the second preset frequency, and so on, until the frequency of each unit in all groups of air source heat pumps is loaded to the second preset frequency. The first preset frequency may be a preset optimal frequency; the second preset frequency may be a preset full-load frequency. During loading, the corresponding water pumps are synchronously frequency-increased according to pressure or temperature difference. (When user demand decreases, the terminal valve closes, the flow rate in the main pipeline increases, leading to a larger pressure difference; in this case, the water pump frequency decreases synchronously, and vice versa. When user demand decreases, the terminal valve closes, the return water temperature decreases (the terminal doesn't need as much cooling capacity), leading to a smaller temperature difference; in this case, the water pump frequency decreases synchronously, and vice versa.) The process involves first starting the corresponding heat pump, then opening the corresponding control valve, and then starting the system. For every decrease in pressure difference or increase in temperature difference by a preset value, the frequency of the corresponding water pump increases by a preset value. When the corresponding water pump reaches the preset full-load frequency, if it cannot meet the requirements for independent operation of the air source heat pump (when all main units of all groups of air source heat pumps are loaded to full-load frequency, the supply water temperature and / or return water temperature still do not meet the preset requirements), the system switches to a parallel operation mode of the air source heat pump and the gas boiler.

[0162] For example, in the first group, the first main unit is loaded to the optimal frequency before the next unit is loaded, and so on, until all units are loaded to the optimal frequency. Then, the second group is started (the pump is started first, then the valve is opened, and then the unit is started to prevent low flow alarms). After the second group is fully loaded to the optimal frequency, the first and second groups of main units are loaded to full load simultaneously. If both groups of water pumps are running at full frequency (the water pumps also increase their frequency synchronously according to the pressure difference or temperature difference while the main units are loaded), the heat pump cannot meet the heating requirements alone (when all main units in all groups of air source heat pumps are loaded to the full load frequency, the supply water temperature and / or return water temperature still do not meet the preset requirements). The mode is corrected to enter the parallel operation mode of the heat pump and boiler (considering that the energy efficiency of the heat pump is still higher than the equivalent energy efficiency ratio (COP) of the boiler at this time, it does not enter the boiler-only heating mode separately).

[0163] The specific steps for implementing air source heat pump unloading may include: first, shutting down the main unit of the group of air source heat pumps with the longest cumulative operating time, then closing the corresponding control valve, and then shutting down one heat pump water pump.

[0164] For example, when two heat pumps are running, if the water supply temperature is higher than the set temperature by a certain value and meets the time interval (adjustable from 0 to 30 minutes), the load reduction step is entered. First, the main unit of the group that has been running for a longer time is shut down (the main units in this group are shut down one by one after the frequency is reduced to the lowest level), then the corresponding electric butterfly valve is closed, and then the corresponding group of water pumps is shut down. When only one group of water pumps is running, one is kept on standby when the load is reduced to the lowest frequency and is not shut down (when only one group of heat pumps is running in the system, in order to prevent the system from frequently switching on and off, at least one heat pump and water pump must be in the on state).

[0165] If the gas boiler is currently in standby mode, it will be determined in real time whether the current COP of the air source heat pump is less than the COP of the gas boiler's equivalent heat pump. f And whether the current supply water temperature and / or return water temperature meet the preset requirements; if it is determined that the current air source heat pump energy efficiency ratio (COP) is less than the equivalent heat pump energy efficiency ratio (COP) of the gas boiler. f If the current supply water temperature and / or return water temperature does not meet the preset requirements and remains so for a first preset time, then the gas boiler loading step is executed. When all at least two sets of gas boilers are running, if the current supply water temperature or return water temperature is higher than the set temperature by a preset temperature value and remains so for a second preset time, then the gas boiler unloading step is executed. Specifically, it is determined whether the temperature difference between the current main supply water temperature and the main return water temperature of the gas boiler is less than or equal to a preset second supply and return water temperature difference threshold. If the temperature difference is determined to be less than or equal to the preset second supply and return water temperature difference threshold, then the current supply water temperature and / or return water temperature is determined to meet the preset requirements. Further, if it is determined that the COP of the air source heat pump corresponding to the current average outdoor temperature is less than the COP of the equivalent heat pump of the gas boiler... f If the temperature difference is less than or equal to a preset second supply and return water temperature difference threshold and greater than or equal to a preset first supply and return water temperature difference threshold, then the current operating state remains unchanged; if it is determined that the COP of the air source heat pump corresponding to the current outdoor average temperature is less than the COP of the equivalent heat pump of the gas boiler, then the current operating state remains unchanged. f If the temperature difference is less than the preset first supply and return water temperature difference threshold, the heating system enters standby mode.

[0166] The specific steps for loading the gas-fired boilers may include: first, loading the load of each boiler in each group of gas-fired boilers to a first preset load rate, and then loading them to a second preset load rate. That is, first loading the load rate of each boiler in one group of gas-fired boilers to the first preset load rate, then to the second preset load rate, then loading the load rate of each boiler in another group of gas-fired boilers to the first preset load rate, then to the second preset load rate, and so on, until the load rate of all boilers in all groups of gas-fired boilers is loaded to the second preset load rate. The first preset load rate can be a preset percentage of the preset maximum load rate (full load); the second preset load rate can be the preset maximum load rate. During loading, the corresponding water pumps are synchronously frequency-increased according to the pressure difference or temperature difference. Specifically, the corresponding boiler water pump is started first, then the corresponding control valve is opened, then the boiler is started. For every decrease in pressure difference or increase in temperature difference by a preset value, the frequency of the corresponding water pump increases by a preset value. When the corresponding water pump is turned on and its frequency is increased to the preset full-load frequency, if it cannot meet the requirements for the gas boiler to operate alone (when all gas boilers in all groups of gas boilers are loaded to the full-load frequency, the supply water temperature and / or return water temperature still do not meet the preset requirements), then the operation mode of the air source heat pump and the gas boiler in parallel is switched.

[0167] For example, in the first group, the first boiler is loaded to 90% of its maximum load rate before the next boiler is loaded, and so on, until all boilers in the group are loaded to 90% of their maximum load rate. Then the second group is started (the pump is started first, then the valve is started, then the boiler is started). After all boilers in the second group are loaded to 90% of their maximum load rate, the first and second groups of boilers are loaded to full load (maximum load rate) simultaneously. If both groups of water pumps are running at full frequency (the water pumps also increase their frequency synchronously according to the pressure difference or temperature difference while the boilers are being loaded), the boiler cannot meet the heating requirements alone. Therefore, the mode is adjusted to enter the parallel operation mode of the heat pump and the boiler.

[0168] The specific steps for reducing the load on gas-fired boilers may include: first, shutting down each boiler in the group of gas-fired boilers with the longest cumulative operating time, then closing the corresponding control valves, and then shutting down one boiler water pump.

[0169] For example, when two sets of boilers are running, if the water supply temperature is higher than the set temperature by a certain value and meets the time interval (adjustable from 0 to 30 minutes), the load reduction step is entered. First, the boilers in the set that have been running for a longer time are shut down (the boilers in the set are shut down one by one after the load rate is reduced to the minimum). Then, the corresponding control valve is closed, and then one set of water pumps is shut down. When only one set is running, one boiler is kept on standby when the load is reduced to the minimum frequency and is not shut down (when only one set of boilers is running in the system, in order to prevent the system from frequently switching on and off, at least one boiler and water pump must be in the on state).

[0170] If the air source heat pump and gas boiler are currently operating in parallel, it will be determined in real time whether the current COP of the air source heat pump is greater than or equal to the COP of the gas boiler's equivalent heat pump. f And whether the current supply water temperature and / or return water temperature meet the preset requirements; if it is determined that the current air source heat pump energy efficiency ratio (COP) is greater than or equal to the equivalent heat pump energy efficiency ratio (COP) of the gas boiler. f If the current supply water temperature and / or return water temperature do not meet the preset requirements and remain so for a first preset time, then the air source heat pump loading step is executed first, followed by the gas boiler loading step. The execution of the air source heat pump loading step and the gas boiler loading step are the same as in the aforementioned embodiments. If it is determined that the current air source heat pump energy efficiency ratio (COP) is less than the equivalent heat pump energy efficiency ratio (COP) of the gas boiler, then... f If the current supply water temperature and / or return water temperature do not meet the preset requirements and remain so for a first preset time, then the gas boiler loading step is executed first, followed by the air source heat pump loading step. Specifically, it is determined whether the temperature difference between the current heating main supply water temperature and the heating main return water temperature is less than or equal to a preset sixth supply-return water temperature difference threshold. If the temperature difference is determined to be less than or equal to the preset sixth supply-return water temperature difference threshold (not greater than the preset sixth supply-return water temperature difference threshold), then the current supply water temperature and / or return water temperature is determined to meet the preset requirements. Further, if it is determined that the COP of the air source heat pump corresponding to the current average outdoor temperature is less than the COP of the equivalent heat pump of the gas boiler... f If the temperature difference is less than or equal to the preset sixth supply and return water temperature difference threshold and greater than or equal to the preset fifth supply and return water temperature difference threshold, then the current operating state remains unchanged; if it is determined that the COP of the air source heat pump corresponding to the current outdoor average temperature is less than the COP of the equivalent heat pump of the gas boiler, then the current operating state remains unchanged. f If the temperature difference is less than the preset fifth supply and return water temperature difference threshold, the heating system enters standby mode. The air source heat pump loading step and the gas boiler loading step are the same as in the previous embodiments. When all at least two air source heat pumps are loaded to the preset full-load frequency and all at least two gas boilers are loaded to the maximum load rate, if the current supply water temperature and / or return water temperature still do not meet the preset requirements, the system enters the air source heat pump and gas boiler series operation mode.

[0171] If the current supply water temperature or return water temperature is higher than the set temperature by a preset value and remains higher for a second preset time, then the air source heat pump load reduction step and / or the gas boiler load reduction step will be executed. Specifically, based on the current COP of the air source heat pump and the equivalent heat pump COP of the gas boiler, if the current COP of the air source heat pump is less than the equivalent heat pump COP of the gas boiler... fIf the air source heat pump load reduction step is executed first, followed by the gas boiler load reduction step, then the air source heat pump load reduction step is executed. The execution of the air source heat pump load reduction step and the gas boiler load increase step are the same as in the previous embodiments. If the current air source heat pump COP is greater than or equal to the gas boiler's equivalent heat pump COP... f If the gas boiler is unloaded first, then the air source heat pump is unloaded. The unloading steps for the air source heat pump and the gas boiler are the same as in the previous embodiments. Further, when both air source heat pumps are unloaded to a preset minimum load frequency, both gas boilers are unloaded to a minimum load rate, and the corresponding water pump frequency is reduced to a preset minimum frequency, the system enters either the air source heat pump stand-alone operation mode or the gas boiler stand-alone operation mode.

[0172] For example, the loading process is as follows: In real time, it is determined whether the COP of the heat pump is higher than that of the gas boiler. If it is lower and the supply and return water temperatures do not meet the requirements, the gas boiler is loaded first, and the heat pump is loaded otherwise. If the supply and return water temperatures still do not meet the requirements after the entire system is loaded to full capacity, the system enters the series operation mode.

[0173] Load reduction steps: Prioritize reducing the load on systems with low energy efficiency. When both the heat pump system and the boiler system are reduced to their minimum load and the water pump frequency is reduced to its lowest level, determine whether to enter the air source heat pump stand-alone mode or the gas boiler stand-alone mode based on the current COP of the air source heat pump and the equivalent COP of the gas boiler. If the current COP of the air source heat pump is greater than or equal to the equivalent COP of the gas boiler, then enter the air source heat pump stand-alone mode. If the current COP of the air source heat pump is less than the equivalent COP of the gas boiler, then enter the gas boiler stand-alone mode.

[0174] If the system is currently operating in series with the air source heat pump and the gas boiler, it will continuously determine whether the current COP of the air source heat pump is greater than the COP of the equivalent heat pump of the gas boiler. f And whether the current supply water temperature and / or return water temperature meet the preset requirements; if it is determined that the current COP of the air source heat pump is greater than the COP of the equivalent heat pump of the gas boiler. f If the current supply water temperature and / or return water temperature do not meet the preset requirements and remain so for a first preset time, then the air source heat pump loading step is executed first, followed by the gas boiler loading step. The execution of the air source heat pump loading step and the gas boiler loading step are the same as in the aforementioned embodiments. If it is determined that the current air source heat pump energy efficiency ratio (COP) is less than the equivalent heat pump energy efficiency ratio (COP) of the gas boiler, then... fIf the current supply water temperature and / or return water temperature do not meet the preset requirements and remain so for a first preset time, then the gas boiler loading step is executed first, followed by the air source heat pump loading step. The execution of the air source heat pump loading step and the gas boiler loading step are the same as in the aforementioned embodiments. It is determined whether the temperature difference between the current heating main supply water temperature and the heating main return water temperature is less than or equal to a preset sixth supply-return water temperature difference threshold. If the temperature difference is determined to be less than or equal to the preset sixth supply-return water temperature difference threshold (not greater than the preset sixth supply-return water temperature difference threshold), then the current supply water temperature and / or return water temperature is determined to meet the preset requirements. Further, if it is determined that the COP of the air source heat pump corresponding to the current average outdoor temperature is less than the COP of the equivalent heat pump of the gas boiler... f If the temperature difference is less than or equal to the preset sixth supply and return water temperature difference threshold and greater than or equal to the preset fifth supply and return water temperature difference threshold, then the current operating state remains unchanged; if it is determined that the COP of the air source heat pump corresponding to the current outdoor average temperature is less than the COP of the equivalent heat pump of the gas boiler, then the current operating state remains unchanged. f If the temperature difference is less than the preset fifth supply and return water temperature difference threshold, the heating system enters standby mode.

[0175] If the current supply water temperature or return water temperature is higher than the set temperature by a preset value and remains higher for a second preset time, then an air source heat pump load reduction step or a gas boiler load reduction step will be executed. Specifically, based on the current COP of the air source heat pump and the equivalent heat pump COP of the gas boiler, if the current COP of the air source heat pump is less than the equivalent heat pump COP of the gas boiler... f If the air source heat pump load reduction step is executed first, followed by the gas boiler load reduction step, then the air source heat pump load reduction step is executed. The execution of the air source heat pump load reduction step and the gas boiler load increase step are the same as in the previous embodiments. If the current air source heat pump COP is greater than or equal to the gas boiler's equivalent heat pump COP... f If the gas boiler is unloaded first, then the air source heat pump is unloaded. The unloading steps for the air source heat pump and the gas boiler are the same as in the previous embodiments. Further, when both air source heat pumps are unloaded to a preset minimum load frequency, both gas boilers are unloaded to a minimum load rate, and the corresponding water pump frequency is reduced to a preset minimum frequency, the system enters a parallel operation mode for the air source heat pump and the gas boiler.

[0176] For example, the loading process involves: real-time determination of whether the heat pump efficiency is higher than the equivalent energy efficiency ratio (COP) of the gas boiler; if it is lower and the supply and return water temperatures do not meet the requirements, the gas boiler is loaded first, and vice versa. Since the main pipe setting temperature is fixed, the return water is first preheated by the heat pump and then heated in two stages by the gas boiler. The higher the supply water temperature, the lower the heat pump efficiency. The optimal operating mode is achieved by real-time detection of the efficiency of the two heat sources.

[0177] Load reduction steps: Prioritize reducing the load on systems with low energy efficiency. When both the heat pump and boiler systems are reduced to the minimum load and the water pump frequency is reduced to the minimum, they enter parallel operation mode.

[0178] The heating system of this invention is not limited to single-unit control in a single building or a single machine room, but can be constructed into a regional distributed heating cluster. For example, multiple "heat pump + boiler" series-parallel terminal nodes located in different buildings or areas can be connected to a cloud control platform through an Internet of Things (IoT) gateway to achieve control.

[0179] Optionally, the device 100 further includes a switching unit (not shown).

[0180] The switching unit is configured to, if currently in air source heat pump standalone operation mode, after executing the air source heat pump loading step, when the corresponding activated water pump reaches a preset full-load frequency, if the air source heat pump standalone operation requirements cannot be met, switch to air source heat pump and gas boiler parallel operation mode; and / or; the switching unit is configured to, if currently in gas boiler standalone operation mode, after executing the gas boiler loading step, when the corresponding activated water pump reaches a preset full-load frequency, if the gas boiler standalone operation requirements cannot be met, switch to air source heat pump and gas boiler parallel operation mode; and / or; the switching unit is configured to, if currently in air source heat pump and gas boiler parallel operation mode, when all at least two air source heat pumps are loaded to a preset full-load frequency and all at least two gas boilers are loaded to maximum load rate, if the current supply water temperature and / or return water temperature still do not meet the preset requirements, switch to air source heat pump and gas boiler series operation mode.

[0181] Optionally, the device further includes: a third determining unit and an adjusting unit (not shown), used to determine whether the air source heat pump will frost based on outdoor environmental parameters within a preset future time period when the heating system is operating in parallel operation mode of the air source heat pump and the gas boiler or in series operation mode of the air source heat pump and the gas boiler; and an adjusting unit, used to adjust if the third determining unit determines that the air source heat pump will frost and the equivalent heat pump efficiency ratio (COP) of the gas boiler is within a certain range. f If the outdoor temperature is greater than the average outdoor temperature within the preset future time period, corresponding to the air source heat pump defrosting efficiency ratio (COP), then the air source heat pump will reduce its load, and the gas boiler will increase its load; if the third determining unit determines that the air source heat pump will defrost, and the gas boiler's equivalent heat pump efficiency ratio (COP) is greater than the average outdoor temperature within the preset future time period, then the air source heat pump will reduce its load, and the gas boiler will increase its load. f If the air source heat pump defrost efficiency ratio (COP) is not greater than the outdoor temperature within the preset future time period, the air source heat pump will no longer be loaded.

[0182] Specifically, weather information can be obtained via the internet to acquire outdoor environmental parameters for a preset future time period. These parameters may include outdoor ambient temperature, outdoor relative humidity, and freezing point temperature. Based on these parameters, it can be predicted whether the heat pump will frost. For example, if the outdoor relative humidity is greater than a set humidity value and the difference between the outdoor ambient temperature and the freezing point temperature meets a set difference requirement, it can be determined that the air source heat pump may be about to frost.

[0183] The present invention also provides a storage medium corresponding to the control method of the heating system, wherein a computer program is stored thereon, and the program, when executed by a processor, implements the steps of any of the aforementioned methods.

[0184] The present invention also provides a heating system corresponding to the control method of the heating system, including a processor, a memory, and a computer program stored in the memory that can run on the processor, wherein the processor executes the program to implement the steps of any of the aforementioned methods.

[0185] The present invention also provides a heating system corresponding to the control device of the heating system, including the control device of any of the aforementioned heating systems.

[0186] The present invention also provides a computer program product corresponding to the control method of the heating system, comprising a computer program that, when executed by a processor, implements the steps of any of the aforementioned methods.

[0187] Accordingly, the solution provided by this invention can obtain the COP of the equivalent heat pump of the gas boiler based on real-time meteorological data, load demand and gas-electricity price ratio. By comparing the real-time heat pump energy efficiency, it can automatically and seamlessly switch between pure air source mode, pure boiler mode, heat pump-boiler series mode and heat pump-boiler parallel mode. This ensures that the system prioritizes the use of high-efficiency heat pumps during mild transitional seasons, utilizes boilers for supplemental heating or series heating during severe winters, and flexibly adjusts strategies during periods of high electricity price / low gas price, so that the system always operates in the optimal COP range. This solves the energy efficiency bottleneck of single mode or fixed combination mode and has energy-saving effects.

[0188] According to the technical solution of this invention, a real-time gas-to-electricity ratio calculation model is introduced, and combined with peak-valley electricity pricing policies, the energy combination with the lowest overall operating cost for the current period is automatically selected. For example, during periods of low electricity prices or high gas prices, the system automatically tends to maximize the output of the air source heat pump; conversely, it prioritizes the use of the boiler. This strategy effectively copes with complex and variable climate conditions and drastically fluctuating energy prices, significantly reducing the total life-cycle operating costs.

[0189] According to the technical solution of the present invention, a dynamic variable flow rate and variable water temperature control strategy is adopted. The system can accurately adjust the supply and return water temperature difference according to changes in outdoor temperature to avoid overheating; at the same time, it reduces unnecessary power consumption of the circulating water pump, further improving the overall energy efficiency ratio of the system.

[0190] According to the technical solution of the present invention, a dual-heat-source independent circulation architecture is adopted, which has extremely strong fault tolerance. When one of the main units (heat pump or boiler) or the corresponding water pump fails, the system can automatically degrade to the independent operation of the other device (or switch to single heat source mode), ensuring continuous heating without interruption and overcoming the fatal weakness of traditional series systems where "if one fails, all fail".

[0191] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this invention and the appended claims. For example, due to the nature of software, the functions described above can be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units can be integrated into a single processing unit, or each unit can exist physically separately, or two or more units can be integrated into a single unit.

[0192] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0193] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0194] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to related technologies, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0195] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A control method for a heating system, characterized in that, The heating system includes at least two sets of air source heat pumps and at least two sets of gas-fired boilers; the at least two sets of gas-fired boilers are connected in parallel, and each set of gas-fired boilers includes at least two gas-fired boilers; the at least two sets of air source heat pumps are connected in parallel, and each set of air source heat pumps includes at least two air source heat pumps; the water inlets of the at least two sets of gas-fired boilers are connected in parallel and then connected to at least two boiler water pumps; the water inlets of the at least two sets of air source heat pumps are connected in parallel and then connected to at least two heat pump water pumps; the adjustable flow range of the boiler water pumps is greater than the adjustable flow range of the heat pump water pumps; control valves are respectively installed on the water inlet pipes of the at least two sets of gas-fired boilers and the water inlet pipes of the at least two sets of air source heat pumps. The heating system is capable of operating in a standalone air source heat pump mode, a standalone gas boiler mode, a parallel operation mode of the air source heat pump and the gas boiler, and a series operation mode of the air source heat pump and the gas boiler; the control method includes: Determine the current heating cycle; Determine the current operating mode based on the current heating cycle; Control the heating system to enter a defined operating mode; Based on the current energy efficiency ratio of the air source heat pump, the equivalent energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature, implement loading or unloading of the air source heat pump and / or gas boiler.

2. The method according to claim 1, characterized in that, The heating cycle includes: a first heating cycle, a second heating cycle, a third heating cycle, and a fourth heating cycle, wherein the outdoor temperature decreases sequentially in the first, second, third, and fourth heating cycles; based on the determined current heating cycle, the current operating mode is determined, including: If the current heating cycle is the first heating cycle or the second functional cycle, the air source heat pump stand-alone operation mode or the gas boiler stand-alone operation mode will be determined based on the current gas price, electricity price and the average outdoor temperature of the day. If we are currently in the third heating cycle, then we will determine to enter the parallel operation mode of the air source heat pump and the gas boiler. If we are currently in the fourth heating cycle, then we will determine whether to enter the air source heat pump and gas boiler series operation mode.

3. The method according to claim 2, characterized in that, If we are currently in the first heating cycle, the current operating mode will be determined based on the current gas price, electricity price, and the average outdoor temperature of the day, including: Calculate the current equivalent heat pump energy efficiency ratio of the gas boiler based on the current gas price and electricity price, and obtain the air source heat pump energy efficiency ratio corresponding to the average outdoor temperature of the day; The current operating mode is determined based on the calculated current equivalent heat pump energy efficiency ratio of the gas boiler and the air source heat pump energy efficiency ratio corresponding to the average outdoor temperature of the day. Specifically, it determines whether the current equivalent heat pump energy efficiency ratio of the gas boiler is greater than the air source heat pump energy efficiency ratio corresponding to the average outdoor temperature of the day; if the current equivalent heat pump energy efficiency ratio of the gas boiler is greater than the air source heat pump energy efficiency ratio corresponding to the average outdoor temperature of the day, it determines to enter the gas boiler stand-alone operation mode; otherwise, it determines to enter the air source heat pump stand-alone operation mode.

4. The method according to any one of claims 1-3, characterized in that, Controlling the heating system to enter a defined operating mode includes: If it is determined to enter the air source heat pump stand-alone operation mode, then turn on the group of air source heat pumps with the shortest cumulative operating time, and correspondingly turn on one heat pump water pump with the shortest cumulative operating time. If it is determined to enter the gas boiler stand-alone operation mode, then the group of gas boilers with the shortest cumulative operating time will be turned on, and the corresponding boiler water pump with the shortest cumulative operating time will be turned on. If it is determined that the air source heat pump and gas boiler are to be operated in parallel, then the air source heat pump and the gas boiler with the shortest cumulative operating time will be turned on, and one heat pump water pump and one boiler water pump with the shortest cumulative operating time will be turned on respectively. If it is determined that the air source heat pump and gas boiler are to be operated in series, then the air source heat pump and the gas boiler with the shortest cumulative operating time will be turned on, and a heat pump water pump with the shortest cumulative operating time will be turned on accordingly.

5. The method according to any one of claims 1-3, characterized in that, Based on the current air source heat pump energy efficiency ratio, the equivalent heat pump energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature, implement loading or unloading of the air source heat pump and / or gas boiler, including: If the air source heat pump is currently in standby mode, it will determine in real time whether the current air source heat pump energy efficiency ratio is greater than the equivalent heat pump energy efficiency ratio of the gas boiler and whether the current supply water temperature and / or return water temperature meet the preset requirements. If it is determined that the current air source heat pump energy efficiency ratio is greater than the equivalent heat pump energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature does not meet the preset requirements and continues for a first preset time, then the air source heat pump loading step is executed. When all at least two sets of air source heat pumps are running, if the current supply water temperature or return water temperature is higher than the set temperature by a preset temperature value and continues for a second preset time, then the air source heat pump unloading step is executed. And / or, If the gas boiler is currently in standby mode, the system will determine in real time whether the current air source heat pump efficiency ratio is less than the equivalent heat pump efficiency ratio of the gas boiler and whether the current supply water temperature and / or return water temperature meet the preset requirements. If it is determined that the current air source heat pump energy efficiency ratio is less than the equivalent heat pump energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature does not meet the preset requirements and continues for a first preset time, then the gas boiler loading step is executed. When all at least two sets of gas-fired boilers are running, if the current supply water temperature or return water temperature is higher than the set temperature by a preset temperature value and continues for a second preset time, then the gas-fired boiler unloading step is executed. And / or, If the current operation mode is a parallel operation mode of air source heat pump and gas boiler, then determine whether the current energy efficiency ratio of air source heat pump is greater than or equal to the equivalent heat pump energy efficiency ratio of gas boiler and whether the current supply water temperature and / or return water temperature meet the preset requirements. If it is determined that the current air source heat pump energy efficiency ratio is greater than or equal to the equivalent heat pump energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature does not meet the preset requirements and continues for a first preset time, then the air source heat pump loading step is executed first, and then the gas boiler loading step is executed. If it is determined that the current air source heat pump energy efficiency ratio is less than the equivalent heat pump energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature does not meet the preset requirements and continues for a first preset time, then the gas boiler loading step is executed first, and then the air source heat pump loading step is executed. If the current supply water temperature or return water temperature is higher than the set temperature by a preset temperature value and remains higher for a second preset time, then the air source heat pump unloading step and / or the gas boiler unloading step will be executed. If the current air source heat pump energy efficiency ratio is less than the equivalent heat pump energy efficiency ratio of the gas boiler, then the air source heat pump unloading step will be executed first, followed by the gas boiler unloading step. If the current air source heat pump energy efficiency ratio is greater than or equal to the equivalent heat pump energy efficiency ratio of the gas boiler, then the gas boiler unloading step will be executed first, followed by the air source heat pump unloading step.

6. The method according to claim 5, characterized in that, The air source heat pump loading steps include: first loading the frequency of each main unit in each group of air source heat pumps to the first preset frequency, and then loading them to the second preset frequency one by one. And / or, The steps for unloading an air source heat pump include: first, shutting down the main unit of the group of air source heat pumps that has been running for the longest time, then closing the corresponding control valve, and then shutting down one heat pump water pump. and / or; The gas boiler loading process includes: first loading the load of each boiler in each group of gas boilers to the first preset load rate, and then loading them to the second preset load rate one by one. and / or; The steps for reducing the load on gas-fired boilers include: first, shutting down each boiler in the group of gas-fired boilers with the longest cumulative operating time, then closing the corresponding control valves, and then shutting down one boiler water pump.

7. The method according to claim 5, characterized in that, Also includes: If the air source heat pump is currently in stand-alone operation mode, after the air source heat pump loading step is executed, when the corresponding water pump is turned on and the frequency is increased to the preset full-load frequency, if the requirements for stand-alone operation of the air source heat pump cannot be met, the air source heat pump and gas boiler will be switched to parallel operation mode. and / or; If the gas boiler is currently in standby mode, after the gas boiler loading step is executed, when the corresponding water pump is turned on and the frequency is increased to the preset full load frequency, if the requirements for standby operation of the gas boiler cannot be met, the system will switch to parallel operation mode of air source heat pump and gas boiler. and / or; If the air source heat pump and gas boiler are currently in parallel operation mode, and at least two air source heat pumps are all loaded to the preset full-load frequency and at least two gas boilers are all loaded to the maximum load rate, if the current supply water temperature and / or return water temperature still do not meet the preset requirements, then the air source heat pump and gas boiler will be in series operation mode.

8. The method according to any one of claims 1-3, characterized in that, Also includes: When the heating system is running in parallel operation mode of air source heat pump and gas boiler or in series operation mode of air source heat pump and gas boiler, it is determined whether the air source heat pump will frost based on the outdoor environmental parameters within a preset time period in the future. If it is determined that the air source heat pump will be frosted, and the equivalent heat pump efficiency ratio of the gas boiler is greater than the defrosting efficiency ratio of the air source heat pump corresponding to the average outdoor temperature in the future preset time period, then the air source heat pump will be unloaded and the gas boiler will be loaded. If it is determined that the air source heat pump will be frosted, and the equivalent heat pump efficiency ratio of the gas boiler is not greater than the defrosting efficiency ratio of the air source heat pump corresponding to the outdoor temperature within the preset future time period, then the air source heat pump will no longer be loaded.

9. The method according to any one of claims 1-3, characterized in that, Also includes: Determine whether the indoor temperature at the farthest end is less than the sum of the indoor set temperature and the preset temperature, or whether the temperature difference between the supply water temperature and the return water temperature of the heating main pipe is greater than the preset temperature difference threshold, and whether the capacity of all equipment in the current operating mode has reached its maximum. If the indoor temperature at the farthest end is determined to be less than the sum of the indoor set temperature and the preset temperature, or the temperature difference between the supply water temperature and the return water temperature of the heating main pipe is greater than the preset temperature difference threshold, and the capacity of all devices in the current operating mode reaches its maximum and continues for a third preset time, then the operating mode corresponding to the next heating cycle will be entered. Otherwise, it will be determined whether the indoor temperature at the farthest end is greater than the sum of the indoor set temperature and the preset temperature, or whether the temperature difference between the supply water temperature and the return water temperature of the heating main pipe is less than the preset temperature difference threshold, and whether the capacity of all air source heat pumps and / or gas boilers in the current operating mode reaches its minimum and continues for a third preset time. If the indoor temperature at the farthest point is determined to be greater than the indoor set temperature, or the temperature difference between the supply and return water temperatures of the heating main pipe is less than the preset temperature difference threshold, and the capacity of all air source heat pumps and / or gas boilers in the current operating mode reaches its minimum and continues for the third preset time, then the operating mode corresponding to the previous heating cycle will be entered.

10. A control device for a heating system, characterized in that, The heating system includes at least two sets of air source heat pumps and at least two sets of gas-fired boilers; the at least two sets of gas-fired boilers are connected in parallel, and each set of gas-fired boilers includes at least two gas-fired boilers; the at least two sets of air source heat pumps are connected in parallel, and each set of air source heat pumps includes at least two air source heat pumps; the water inlets of the at least two sets of gas-fired boilers are connected in parallel and then connected to at least two boiler water pumps; the water inlets of the at least two sets of air source heat pumps are connected in parallel and then connected to at least two heat pump water pumps; the adjustable flow range of the boiler water pumps is greater than the adjustable flow range of the heat pump water pumps; control valves are respectively installed on the water inlet pipes of the at least two sets of gas-fired boilers and the water inlet pipes of the at least two sets of air source heat pumps. The heating system is capable of operating in a standalone air source heat pump mode, a standalone gas boiler mode, a parallel operation mode of the air source heat pump and the gas boiler, and a series operation mode of the air source heat pump and the gas boiler; the control device includes: The first determining unit is used to determine the current heating cycle; The second determining unit is used to determine the current operating mode based on the current heating cycle determined by the first determining unit. A control unit is used to control the heating system to enter a defined operating mode; The execution unit is used to load or unload the air source heat pump and / or gas boiler based on the current air source heat pump energy efficiency ratio, the equivalent heat pump energy efficiency ratio of the gas boiler, and the current supply water temperature and / or return water temperature.

11. A storage medium, characterized in that, It stores a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1-9.

12. An air conditioner, characterized in that, It includes a processor, a memory, and a computer program stored in the memory that can run on the processor, wherein the processor executes the program to implement the steps of any of the methods of claims 1-9, or includes the control device as described in claim 10.

13. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1-9.

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