Air source air conditioning system and control method thereof

Abstract

The application discloses an air source air conditioning system and a control method thereof. The air source air conditioning system has multiple outdoor units arranged in parallel. The control method comprises the following steps: detecting the actual ambient temperature T1.1 beside each started outdoor unit; when the change trend of the actual ambient temperature T1.1 reaches the cold island effect condition or the hot island effect condition, the started outdoor unit is determined as a to-be-optimized unit; it is judged whether there is a non-started outdoor unit in the air source air conditioning system; if yes, the to-be-optimized unit is turned off and the corresponding non-started outdoor unit is started; if not, the outdoor fan of the to-be-optimized unit is turned off and the compressor of the to-be-optimized unit is kept on. According to the change trend of the temperature beside the outdoor unit, whether the cold or hot island effect occurs is predicted, and the corresponding unit is switched, so that the cold or hot island effect is avoided and the performance of the air conditioning system is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning system technology, and more particularly to an air source air conditioning system and its control method. Background Technology

[0002] Air source air conditioning systems have a short history of application in heating scenarios in northern my country. Moreover, due to site limitations, air source air conditioning systems are mostly small systems with a small number of units. As a result, there is little mention of air source air conditioning systems with a large number of units and a clustered matrix arrangement, and there is also little research on the heat island effect in unit clusters.

[0003] In large-scale air source air conditioning systems, the outdoor units are arranged relatively centrally. In winter, the air source air conditioning system is in heating mode. The low-temperature air after heat exchange through the outdoor heat exchanger flows back into the unit located in the middle of the cluster, forming a cold island over time. The temperature of the low-temperature air after heat exchange is significantly lower than the surrounding air temperature, which reduces the evaporation temperature of the unit and decreases the heating capacity. In summer, the air source air conditioning system is in cooling mode. The high-temperature air after heat exchange through the outdoor heat exchanger flows back into the unit located in the middle of the cluster, forming a heat island over time. The temperature of the high-temperature air after heat exchange is significantly higher than the surrounding air temperature, which increases the condensation temperature of the unit and decreases the cooling capacity.

[0004] Air source heat pump air conditioning systems operating under the heat island effect for extended periods can lead to a significant decrease in the system's COP value, resulting in poor stability in heating and cooling, negatively impacting user experience, and being detrimental to energy conservation and environmental protection. Summary of the Invention

[0005] To address the issue of reduced system performance caused by the heat island effect, this invention proposes an air source air conditioning system and its control method. Based on the temperature change trend near the outdoor unit, the system predicts whether a heat island effect will occur and controls the corresponding unit to switch, thereby avoiding the heat island effect and improving the performance of the air conditioning system.

[0006] The technical solution adopted in this invention is a control method designed for an air source air conditioning system, wherein the air source air conditioning system has multiple outdoor units connected in parallel, and the control method includes:

[0007] Measure the actual ambient temperature T1.1 next to each activated outdoor unit;

[0008] When the changing trend of the actual ambient temperature T1.1 reaches the conditions of cold island effect or heat island effect, the outdoor unit that has been turned on is identified as a unit to be optimized.

[0009] Determine whether there is an outdoor unit that is not turned on in the air source air conditioning system;

[0010] If so, then shut down the unit to be optimized and turn on the corresponding unused outdoor unit.

[0011] Furthermore, the air source air conditioning system has a heating mode and / or a cooling mode, and the control method includes:

[0012] If the air source air conditioning system is in heating mode, when the trend of the actual ambient temperature T1.1 reaches the cold island effect condition, the outdoor unit that has been turned on is identified as a unit to be optimized.

[0013] And / or if the air source air conditioning system is in cooling mode, then when the trend of the actual ambient temperature T1.1 reaches the heat island effect condition, the outdoor unit that has been turned on is identified as a unit to be optimized.

[0014] Furthermore, the cold island effect condition is T1.1 < T1 - ΔT1 and lasts for t1 time, where T1 is the initial ambient temperature when the outdoor unit is started, ΔT1 is the first set temperature difference value, and t1 is the first set time.

[0015] The heat island effect condition is T1.1 > T1 + ΔT2 and lasts for t2 time, where T1 is the initial ambient temperature when the outdoor unit is started, ΔT2 is the second set temperature difference value, and t2 is the second set time.

[0016] Furthermore, shutting down the unit to be optimized and turning on the corresponding unused outdoor unit includes: selecting the one with the shortest cumulative running time among all unused outdoor units as the replacement unit, shutting down the unit to be optimized and turning on the replacement unit.

[0017] Furthermore, the control method also includes: when at least two outdoor units that have been turned on are simultaneously identified as units to be optimized, a priority is set according to the cumulative running time of the units to be optimized, and the units to be optimized are processed in order of priority.

[0018] Furthermore, the control method also includes:

[0019] Determine whether there is an outdoor unit that is not turned on in the air source air conditioning system;

[0020] If not, then shut down the outdoor fan of the unit to be optimized, and keep the compressor of the unit to be optimized running.

[0021] Furthermore, the control method also includes: after shutting down the outdoor fan of the unit to be optimized, when the trend of the change of the actual ambient temperature T1.1 reaches the fan start-up condition, restarting the outdoor fan of the unit to be optimized.

[0022] Furthermore, the air source air conditioning system has a heating mode and / or a cooling mode;

[0023] If the air source air conditioning system is in heating mode, the fan is turned on when T1.1 > Tset1 and lasts for t3, where Tset1 is the first set temperature and t3 is the third set time.

[0024] And / or if the air source air conditioning system is in cooling mode, the fan is turned on under the condition that T1.1 < Tset2 and lasts for t4, where Tset2 is the second set temperature and t4 is the fourth set time.

[0025] The present invention also proposes an air source air conditioning system, comprising: at least one indoor unit and multiple outdoor units connected in parallel, wherein the air source air conditioning system manages the outdoor units using the control method described above.

[0026] In some embodiments, the air source air conditioning system further includes:

[0027] At least one thermal imaging camera is used to capture thermal images of all outdoor units;

[0028] The acquisition module is used to receive the thermal imaging image and transmit it to the analysis module;

[0029] An analysis module is used to analyze the thermal imaging image to obtain the actual ambient temperature T1.1;

[0030] The control module is used to send shutdown and startup commands to the corresponding outdoor unit according to the changing trend of the actual ambient temperature T1.1;

[0031] Each of the outdoor units is connected to the control module and provides feedback on its operating status.

[0032] Furthermore, the analysis module selects multiple sampling points within a range of R±△r from the center point of the activated outdoor unit, and takes the average temperature of the sampling points as the actual ambient temperature T1.1; where r is the set radius and △r is the set deviation.

[0033] In other embodiments, the air source air conditioning system further includes:

[0034] Multiple temperature sensors, with each outdoor unit equipped with at least one of the temperature sensors;

[0035] The acquisition module is used to receive the temperature value detected by the temperature sensor and transmit it to the analysis module;

[0036] The analysis module is used to analyze the temperature value corresponding to the outdoor unit that has been turned on to obtain the actual ambient temperature T1.1;

[0037] The control module is used to send shutdown and startup commands to the corresponding outdoor unit according to the changing trend of the actual ambient temperature T1.1;

[0038] Each of the outdoor units is connected to the control module and provides feedback on its operating status.

[0039] Furthermore, the air source air conditioning system has a heating mode and / or a cooling mode;

[0040] If the air source air conditioning system is in heating mode, the analysis module takes the lowest temperature value among the temperature values ​​corresponding to the outdoor unit that has been turned on as the actual ambient temperature T1.1.

[0041] If the air source air conditioning system is in cooling mode, the analysis module takes the highest temperature value among the temperature values ​​corresponding to the outdoor unit that has been turned on as the actual ambient temperature T1.1.

[0042] Furthermore, the outdoor units of the air source air conditioning system are arranged in a clustered matrix.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. Based on the temperature change trend next to the outdoor unit, predict whether a heat island effect will occur, control the corresponding unit to switch, avoid the concentrated operation of outdoor units in close proximity, solve the problem of reduced unit performance caused by the heat island effect, and improve the COP value of the air conditioning system.

[0045] 2. When there are no unused outdoor units in the air source air conditioning system, shut down the outdoor fan of the unit to be optimized to reduce the heat exchange of the outdoor heat exchanger, avoid aggravating the heat island effect, and maintain the normal operation of the unit. Attached Figure Description

[0046] The present invention will now be described in detail with reference to the embodiments and accompanying drawings, wherein:

[0047] Figure 1 This is a schematic diagram of the temperature field when the central unit of this invention is about to experience the cold island effect;

[0048] Figure 2 This is a schematic diagram of the temperature field when the central unit of this invention is about to experience the heat island effect;

[0049] Figure 3 This is a schematic diagram of the process in heating mode for some embodiments of the present invention;

[0050] Figure 4 This is a schematic flowchart of some embodiments of the present invention in cooling mode;

[0051] Figure 5This is a schematic diagram of the thermal imaging camera distribution in some embodiments of the present invention;

[0052] Figure 6 These are flowcharts illustrating the thermal imaging control process of some embodiments of the present invention;

[0053] Figure 7 This is a schematic diagram of the temperature sensor distribution in some embodiments of the present invention;

[0054] Reference numerals: 1. Outdoor unit; 2. Thermal imaging camera; 3. Temperature sensor. Detailed Implementation

[0055] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0056] The control method proposed in this invention is applicable to air source air conditioning systems, especially clustered air source air conditioning systems. The air source air conditioning system includes at least one indoor unit and multiple outdoor units. The multiple outdoor units are connected in parallel and centrally arranged together. Each outdoor unit can form a refrigerant circulation loop with the indoor unit independently.

[0057] like Figure 1 , 2 As shown, assuming there are 9 operating outdoor units 1, since the outdoor fans have the same vertical air intake capacity, taking the air source air conditioning system in heating mode as an example, during winter heating, the cold air after heat exchange will re-enter the units for heat exchange, causing a cold island to form in the middle of the 9-unit cluster. This lowers the evaporation temperature of the central unit, reduces the heating capacity, and lowers the COP value of the air conditioning system. Taking the air source air conditioning system in cooling mode as an example, during summer cooling, the hot air after heat exchange will re-enter the units for heat exchange, causing a heat island to form in the middle of the 9-unit cluster. This raises the condensing temperature of the central unit, reduces the heating capacity, and lowers the COP value of the air conditioning system.

[0058] Based on this, the present invention proposes a control method that can solve the urban heat island effect, the details of which are as follows:

[0059] Measure the actual ambient temperature T1.1 next to each activated outdoor unit;

[0060] When the actual ambient temperature T1.1 changes to the conditions of cold island effect or heat island effect, the outdoor unit that has been turned on is identified as a unit to be optimized.

[0061] Determine if there are any outdoor units in the air source air conditioning system that are not turned on;

[0062] If so, shut down the unit to be optimized and turn on the corresponding outdoor unit that is not currently in use.

[0063] This invention predicts whether a thermal island effect has occurred or is about to occur in an already activated outdoor unit based on the temperature change trend next to the outdoor unit, and controls the corresponding unit to switch, avoiding the concentrated operation of outdoor units in close proximity, solving the problem of reduced unit performance caused by the thermal island effect, and improving the COP value of the air conditioning system.

[0064] It should be noted that air source air conditioning systems can have only a cooling mode, meaning they supply cooling to the room. Alternatively, they can have only a heating mode, providing heating to the room. The preferred option is an air source air conditioning system that uses a heat pump system, meaning it has both heating and cooling modes, allowing it to switch between supplying cooling or heating to the room.

[0065] For heating mode, when the actual ambient temperature T1.1 reaches the conditions for the cold island effect, the outdoor unit that is already turned on is identified as a unit to be optimized. For cooling mode, when the actual ambient temperature T1.1 reaches the conditions for the heat island effect, the outdoor unit that is already turned on is identified as a unit to be optimized.

[0066] Designing corresponding judgment conditions for different functional modes can accurately analyze whether the outdoor unit that has been turned on is experiencing a heat island effect, and promptly control the unit to make adjustments, resulting in more stable operation of the air conditioning system and a better user experience.

[0067] In some embodiments of the present invention, the cold island effect condition is T1.1 < T1 - ΔT1 and lasts for t1, where T1 is the actual ambient temperature when the outdoor unit is started, ΔT1 is a first set temperature difference value, and t1 is a first set time. The heat island effect condition is T1.1 > T1 + ΔT2 and lasts for t2, where T1 is the actual ambient temperature when the outdoor unit is started, ΔT2 is a second set temperature difference value, and t2 is a second set time.

[0068] The design logic for the cold island effect condition is to compare the actual ambient temperature after the unit starts with the initial ambient temperature at startup. If the actual temperature is significantly lower and remains at a low temperature for a prolonged period, it indicates that a cold island effect has occurred. The design logic for the heat island effect condition is to compare the actual ambient temperature after the unit starts with the initial ambient temperature at startup. If the actual ambient temperature is significantly higher and remains at a high temperature for a prolonged period, it indicates that a heat island effect has occurred.

[0069] It should be noted that, in order to improve control accuracy, the actual ambient temperature and the initial ambient temperature of the same unit should be obtained by the same detection method to reduce misjudgment caused by deviations due to different detection methods.

[0070] In a preferred embodiment of the invention, the control method further includes:

[0071] After identifying any outdoor units that have been turned on as units to be optimized, determine whether there are any outdoor units that have not been turned on in the air source air conditioning system.

[0072] If not, shut down the outdoor fan of the unit to be optimized, and keep the compressor of the unit to be optimized running.

[0073] The advantage of this design is that, without replacing the unit, the outdoor fan of the unit to be optimized can be shut down, effectively reducing the heat exchange of the outdoor heat exchanger, avoiding the aggravation of the heat island effect, preventing further deterioration of the evaporation temperature of the unit to be optimized, and maintaining the normal operation of the unit.

[0074] Based on the above embodiments, after shutting down the outdoor fan of the unit to be optimized, when the actual ambient temperature T1.1 changes to the condition for the fan to start, the outdoor fan of the unit to be optimized is restarted to improve the heat exchange efficiency of the unit.

[0075] In some embodiments of the present invention, for the heating mode, the fan is turned on when T1.1 > Tset1 and lasts for t3, where Tset1 is the first set temperature and t3 is the third set time. For the cooling mode, the fan is turned on when T1.1 < Tset2 and lasts for t4, where Tset2 is the second set temperature and t4 is the fourth set time.

[0076] The design logic for the fan start-up conditions is that in heating mode, if the actual ambient temperature T1.1 next to the unit to be optimized increases significantly and remains at a high temperature for a long time, the cold island effect will disappear or weaken, and the outdoor fan of the unit to be optimized will be restarted to improve heat exchange efficiency. In cooling mode, if the actual ambient temperature T1.1 next to the unit to be optimized decreases significantly and remains at a low temperature for a long time, the heat island effect will disappear or weaken, and the outdoor fan of the unit to be optimized will be restarted to improve heat exchange efficiency.

[0077] It should be understood that after the fan of the unit to be optimized is turned on, the unit to be optimized is restored to an already turned-on outdoor unit, and whether it is a unit to be optimized is re-determined based on the changing trend of the actual ambient temperature T1.1.

[0078] like Figure 3 As shown, the control process is explained in detail using an application example in heating mode:

[0079] Step S11: Record the initial ambient temperature T1 when the outdoor unit is turned on;

[0080] Step S12: Real-time detection of the actual ambient temperature T1.1 next to the outdoor unit that has been turned on;

[0081] Step S13: When T1.1 < T1 - △T1 and lasts for t1 time, the outdoor unit that has been turned on is identified as the unit to be optimized.

[0082] Step S14: Determine if there are any outdoor units that are not turned on. If yes, proceed to step S15; otherwise, proceed to step S16.

[0083] Step S15: Turn off the unit to be optimized, turn on the corresponding outdoor unit that is not turned on, and return to step S11;

[0084] Step S16: The outdoor fan of the unit to be optimized is turned off, while the compressor of the unit to be optimized remains on. Then proceed to step S17.

[0085] Step S17: Real-time detection of the actual ambient temperature T1.1 next to the unit to be optimized. When T1.1 > Tset1 and lasts for t3, it is determined that the fan start-up condition has been met, and step S18 is executed.

[0086] Step S18: Restart the outdoor fan of the unit to be optimized, and return to step S12.

[0087] like Figure 4 As shown, the control process is explained in detail using a cooling mode application example:

[0088] Step S21: Record the initial ambient temperature T1 when the outdoor unit is turned on;

[0089] Step S22: Real-time detection of the actual ambient temperature T1.1 next to the outdoor unit that has been turned on;

[0090] Step S23: When T1.1 > T1 + △T2 and lasts for t2 hours, the outdoor unit that has been turned on is identified as the unit to be optimized.

[0091] Step S24: Determine if there are any outdoor units that are not turned on. If yes, proceed to step S25; otherwise, proceed to step S26.

[0092] Step S25: Shut down the unit to be optimized, turn on the corresponding outdoor unit that is not turned on, and return to step S21;

[0093] Step S26: The outdoor fan of the unit to be optimized is turned off, while the compressor of the unit to be optimized remains on. Then proceed to step S27.

[0094] Step S27: Real-time detection of the actual ambient temperature T1.1 next to the unit to be optimized. When T1.1 < Tset2 and lasts for t4, it is determined that the fan start-up condition has been met, and step S28 is executed.

[0095] Step S28: Restart the outdoor fan of the unit to be optimized, and return to step S22.

[0096] It should be understood that after each unit to be optimized is shut down, only one of the unactivated outdoor units needs to be turned on. In order to optimize the control scheme, the selection logic for the unactivated outdoor units is to select the one with the shortest cumulative running time among all the unactivated outdoor units as the replacement unit. Shutting down the unit to be optimized and turning on the replacement unit results in higher reliability and longer service life of the air conditioning system.

[0097] Based on this, when at least two outdoor units that are already in operation are simultaneously identified as units to be optimized, priority is set according to the cumulative operating time of the units to be optimized, and the units to be optimized are processed in order of priority. That is, the replacement unit with the higher priority of the units to be optimized is selected from the non-operational outdoor units. If the number of non-operational units is not enough, the outdoor fans of the remaining units to be optimized are turned off, while the compressors of the remaining units to be optimized are kept running, until the corresponding non-operational outdoor unit can be selected or the corresponding fan start-up conditions are met.

[0098] The present invention also proposes an air source air conditioning system for managing outdoor units using the above-mentioned control method, comprising: at least one indoor unit and multiple outdoor units connected in parallel.

[0099] like Figure 5 , 6 As shown, in some embodiments, the air source air conditioning system further includes: at least one thermal imaging camera, a data acquisition module, an analysis module, and a control module, which uses the thermal imaging camera to capture thermal images of all outdoor units, in order to... Figure 5 Taking the distribution as an example, the outdoor units 1 are distributed in a cluster matrix, with the units being relatively close together. That is, the units are densely distributed. A thermal imaging camera 2 is set on the left and right sides of the outermost part of the matrix. The shooting angle range of the thermal imaging camera 2 is shown by the dotted line. Each camera monitors the area of ​​the nine outdoor units 1. The captured thermal imaging images are stitched into a complete image by the analysis module. Since image stitching is a mature existing technology, such as CN105842755A and CN116883248A, the stitching process will not be described in detail in this invention.

[0100] The acquisition module, analysis module, and control module all belong to the control system and are functional modules divided according to their different functions. The acquisition module receives thermal imaging images and transmits them to the analysis module. The analysis module analyzes the thermal imaging images and determines the actual ambient temperature T1.1 next to each outdoor unit based on the coordinate information and temperature information of each unit. The control module sends shutdown and startup commands to the corresponding outdoor units according to the changing trend of the actual ambient temperature T1.1. Each outdoor unit is connected to the control module and provides feedback on its working status.

[0101] It should be understood that the control module can control and manage each outdoor unit 1 and the thermal imaging camera 2. When the outdoor unit 1 is turned on, the thermal imaging camera 2 is controlled to capture thermal imaging images of all outdoor units 1 in order to obtain the initial ambient temperature T1 of the turned-on outdoor unit.

[0102] Furthermore, there are multiple ways to determine the actual ambient temperature T1.1. For ease of understanding, one feasible solution is illustrated below. The analysis module selects multiple sampling points within a distance R ± Δr from the center point of the activated outdoor unit, and takes the average temperature of the sampling points as the actual ambient temperature T1.1, where r is the set radius and Δr is the set deviation. The sampling points can be selected uniformly or randomly, and the actual ambient temperature T1.1 can be the average, highest, or lowest value, depending on the specific requirements. This invention does not impose any special restrictions on this.

[0103] like Figure 7 As shown, in some other embodiments, the air source air conditioning system further includes: multiple temperature sensors 3, a data acquisition module, an analysis module, and a control module. Each outdoor unit 1 is equipped with at least one temperature sensor 3, which is used to detect the temperature value of the outdoor unit 1. Figure 7 Taking the distribution as an example, the outdoor units 1 are distributed in a cluster matrix, with the units being relatively close together. That is, the units are densely distributed. Each outdoor unit 1 has a temperature sensor 3 on both its left and right sides. Two adjacent outdoor units 1 share a temperature sensor 3. The two temperature sensors 3 are used to detect the temperature value next to each outdoor unit 1.

[0104] The acquisition module, analysis module, and control module all belong to the control system and are functional modules divided according to their different functions. The acquisition module receives the temperature values ​​detected by the temperature sensor and transmits them to the analysis module. The analysis module analyzes the temperature values ​​of the two temperature sensors 3 according to the correspondence between each unit and the temperature sensor 3 to obtain the actual ambient temperature T1.1 next to each unit. The control module sends shutdown and startup commands to the corresponding outdoor unit 1 according to the changing trend of the actual ambient temperature T1.1. Each outdoor unit 1 is connected to the control module and provides feedback on its working status.

[0105] It should be understood that the control module can control and manage each outdoor unit 1 and temperature sensor 3. When the outdoor unit 1 is turned on, it controls the temperature sensors 3 on both sides of the unit to detect the temperature value in order to obtain the initial ambient temperature T1 of the turned-on outdoor unit.

[0106] In addition, there are multiple ways to determine the actual ambient temperature T1.1. For ease of understanding, a feasible solution is illustrated as an example. The air source air conditioning system has a heating mode and / or a cooling mode. If the air source air conditioning system is in heating mode, the analysis module takes the lowest temperature value among the temperature values ​​corresponding to the outdoor units that are turned on as the actual ambient temperature T1.1, and the initial ambient temperature T1 is obtained in the same way. If the air source air conditioning system is in cooling mode, the analysis module takes the highest temperature value among the temperature values ​​corresponding to the outdoor units that are turned on as the actual ambient temperature T1.1, and the initial ambient temperature T1 is obtained in the same way.

[0107] It should be noted that the terminology used above is for describing specific embodiments only and is not intended to limit the exemplary embodiments of the present invention. When the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. The order of execution of actions, steps, etc., in the apparatus and methods shown in the specification and drawings can be implemented in any order unless a specific order is expressly specified, and as long as the output of a previous process is not used in a subsequent process. Similar sequential terms used for ease of description do not imply that such an order must be followed.

[0108] Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0109] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for an air-source air conditioning system, wherein the air-source air conditioning system has multiple outdoor units connected in parallel, characterized in that, The control method includes: Measure the actual ambient temperature T1.1 next to each activated outdoor unit; When the changing trend of the actual ambient temperature T1.1 reaches the conditions of cold island effect or heat island effect, the outdoor unit that has been turned on is identified as a unit to be optimized. Determine whether there is an outdoor unit that is not turned on in the air source air conditioning system; If so, then shut down the unit to be optimized and turn on the corresponding unused outdoor unit; The air source air conditioning system has a heating mode and a cooling mode, and the control method includes: If the air source air conditioning system is in heating mode, when the trend of the actual ambient temperature T1.1 reaches the cold island effect condition, the outdoor unit that has been turned on is identified as a unit to be optimized. If the air source air conditioning system is in cooling mode, then when the trend of the actual ambient temperature T1.1 reaches the heat island effect condition, the outdoor unit that has been turned on is identified as a unit to be optimized. The cold island effect condition is T1.1 < T1 - ΔT1 and lasts for t1 time, where T1 is the initial ambient temperature when the outdoor unit is started, ΔT1 is the first set temperature difference value, and t1 is the first set time. The heat island effect condition is T1.1 > T1 + ΔT2 and lasts for t2 time, where T1 is the initial ambient temperature when the outdoor unit is started, ΔT2 is the second set temperature difference value, and t2 is the second set time.

2. The control method according to claim 1, characterized in that, Shutting down the unit to be optimized and turning on the corresponding non-operational outdoor unit includes: selecting the one with the shortest cumulative operating time among all non-operational outdoor units as the replacement unit, shutting down the unit to be optimized and turning on the replacement unit.

3. The control method according to claim 1, characterized in that, The control method further includes: when at least two outdoor units that have been turned on are simultaneously identified as units to be optimized, a priority is set according to the cumulative running time of the units to be optimized, and the units to be optimized are processed in order of priority.

4. The control method according to any one of claims 1 to 3, characterized in that, The control method further includes: Determine whether there is an outdoor unit that is not turned on in the air source air conditioning system; If not, then shut down the outdoor fan of the unit to be optimized, and keep the compressor of the unit to be optimized running.

5. The control method according to claim 4, characterized in that, The control method further includes: after shutting down the outdoor fan of the unit to be optimized, restarting the outdoor fan of the unit to be optimized when the trend of the change of the actual ambient temperature T1.1 reaches the fan start-up condition.

6. The control method according to claim 5, characterized in that, If the air source air conditioning system is in heating mode, the fan is turned on when T1.1 > Tset1 and lasts for t3, where Tset1 is the first set temperature and t3 is the third set time. If the air source air conditioning system is in cooling mode, the fan is turned on when T1.1 < Tset2 and lasts for t4, where Tset2 is the second set temperature and t4 is the fourth set time.

7. Air source heat pump air conditioning system, including: The system comprises at least one indoor unit and multiple outdoor units connected in parallel, characterized in that the air source air conditioning system employs the control method described in any one of claims 1 to 6.

8. The air source air conditioning system according to claim 7, characterized in that, Also includes: At least one thermal imaging camera is used to capture thermal images of all outdoor units; The acquisition module is used to receive the thermal imaging image and transmit it to the analysis module; An analysis module is used to analyze the thermal imaging image to obtain the actual ambient temperature T1.1; The control module is used to send shutdown and startup commands to the corresponding outdoor unit according to the changing trend of the actual ambient temperature T1.1; Each of the outdoor units is connected to the control module and provides feedback on its operating status.

9. The air source air conditioning system according to claim 8, characterized in that, The analysis module selects multiple sampling points within a distance R±△r from the center point of the activated outdoor unit, and takes the average temperature of the sampling points as the actual ambient temperature T1.1; where r is the set radius and △r is the set deviation.

10. The air source air conditioning system according to claim 7, characterized in that, Also includes: Multiple temperature sensors, with each outdoor unit equipped with at least one of the temperature sensors; The acquisition module is used to receive the temperature value detected by the temperature sensor and transmit it to the analysis module; The analysis module is used to analyze the temperature value corresponding to the outdoor unit that has been turned on to obtain the actual ambient temperature T1.1; The control module is used to send shutdown and startup commands to the corresponding outdoor unit according to the changing trend of the actual ambient temperature T1.1; Each of the outdoor units is connected to the control module and provides feedback on its operating status.

11. The air source air conditioning system according to claim 10, characterized in that, The air source air conditioning system has a heating mode and a cooling mode; If the air source air conditioning system is in heating mode, the analysis module takes the lowest temperature value among the temperature values ​​corresponding to the outdoor unit that has been turned on as the actual ambient temperature T1.

1. If the air source air conditioning system is in cooling mode, the analysis module takes the highest temperature value among the temperature values ​​corresponding to the outdoor unit that has been turned on as the actual ambient temperature T1.

1.

12. The air source air conditioning system according to claim 7, characterized in that, The outdoor units of the air source air conditioning system are arranged in a cluster matrix.

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