Control method of air conditioning system

Abstract

The invention relates to the technical field of air conditioners, particularly provides a control method of an air conditioning system, and aims to solve the problem of poor energy-saving performance of an existing air conditioning system due to poor self-adaptive control capability. The air conditioning system comprises a compressor unit. The control method comprises the steps that a compressor is started and runs for a first preset duration; the target temperature, the initial temperature change index, the room temperature at the reference moment and the room temperature at the first moment are obtained; calculating a predicted temperature at a second moment; the room temperature at the second moment and the current load of the compressor unit are obtained; calculating a temperature change index correction value and a current temperature change index, and calculating a predicted temperature at a third moment based on the current temperature change index, the room temperature and the room temperature; the difference value between the predicted temperature and the target temperature is calculated, and the demand load of the compressor unit is calculated based on the difference value; and comparing the demand load with the current load, and adjusting the actual load of the compressor unit based on the comparison result. According to the invention, endless waste of energy can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular provides a control method for an air conditioning system. Background Art

[0002] With the widespread adoption of HVAC systems in modern buildings, user requirements for indoor environmental comfort and system energy efficiency have significantly increased. However, current air conditioning systems generally rely on a fixed temperature differential control strategy. Its core control logic is based on a preset fixed temperature differential threshold, resulting in the inability to precisely match compressor output to the actual building operating conditions. This "static threshold-driven" control mode forces the system to operate at high power during partial load periods (such as low traffic at night and during off-peak hours), resulting in significant energy waste.

[0003] Although existing adaptive control technologies attempt to improve energy efficiency by optimizing response speed, they still have significant flaws: First, they rely on manual experience or expert knowledge for parameter adjustment, which cannot cover complex and changeable actual operating conditions; second, they lack in-depth utilization of historical operating data and fail to establish a dynamic mapping relationship between indoor temperature changes and compressor load, resulting in the control strategy being unable to predict future demand loads. Summary of the Invention

[0004] The present invention aims to solve the above technical problems, that is, at least to solve the problem that the existing air-conditioning system has poor energy-saving performance due to poor adaptive control capability.

[0005] In a first aspect, the present invention provides a control method for an air-conditioning system, wherein the air-conditioning system includes a compressor unit, wherein the compressor unit includes at least one compressor, and the control method includes:

[0006] Starting at least one compressor and running it for a first preset time period;

[0007] Obtaining the target temperature, the initial temperature change index α0, the room temperature T0 at the reference time, and the room temperature T1 at the first time;

[0008] Calculating a predicted temperature T2′ at a second moment based on the initial temperature change index α0, the room temperature T0, and the room temperature T1;

[0009] Obtaining the room temperature T2 at the second moment and the current load of the compressor unit;

[0010] Calculating a temperature change index correction value Δα based on the room temperature T2 and the predicted temperature T2′;

[0011] Calculating a current temperature variation index α based on the initial temperature variation index α0 and the temperature variation index correction value Δα;

[0012] Calculating a predicted temperature T3′ at a third moment based on the current temperature change index α, the room temperature T1, and the room temperature T2, wherein the intervals between the reference moment, the first moment, the second moment, and the third moment are a second preset time length;

[0013] calculating a difference between the predicted temperature T3′ and the target temperature, and calculating a required load of the compressor unit based on the difference;

[0014] The required load is compared with the current load, and based on the comparison result, the actual load of the compressor group is adjusted.

[0015] In some feasible implementations of the above-mentioned air-conditioning system control method, the “adjusting the actual load of the compressor unit based on the comparison result” includes:

[0016] If the required load is less than the current load, reducing the actual load of the compressor unit; or

[0017] If the required load is greater than the current load, increasing the actual load of the compressor unit; or

[0018] If the required load is equal to the current load, the current load of the compressor group is maintained unchanged.

[0019] In some feasible implementations of the above-mentioned method for controlling the air-conditioning system, the compressor group includes at least two compressors, and the “adjusting the actual load of the compressor group” includes:

[0020] Adjust the number of starts of the compressor.

[0021] In some feasible implementations of the above-mentioned air-conditioning system control method, the “adjusting the number of startups of the compressor” includes:

[0022] If the required load is greater than the current load, and the load ratio of the compressors in operation is greater than or equal to a first preset ratio, the number of startups of the compressors is increased.

[0023] In some feasible implementations of the above-mentioned air-conditioning system control method, the control method further includes:

[0024] In the case of increasing the number of activations of the compressors, the loads of the compressors are made equal, and the total load of the compressor group is equal to the demand load.

[0025] In some feasible implementations of the above-mentioned air-conditioning system control method, the “adjusting the number of startups of the compressor” includes:

[0026] When there are no less than two compressors in operation and the required load is less than the current load, if the load ratio of one of the compressors is less than or equal to a second preset ratio, the number of compressors started is reduced.

[0027] In some feasible implementations of the above-mentioned air-conditioning system control method, the compressor unit includes at least two compressors. When the number of compressors in operation is not less than two, the control method further includes:

[0028] Before adjusting the actual load of the compressor group based on the comparison result, obtaining the load ratio of each compressor;

[0029] comparing the load ratio with a third preset ratio;

[0030] The operating frequency of the compressor group is selectively adjusted based on a comparison result of the load ratio and the third preset ratio, and based on a comparison result of the required load and the current load.

[0031] In some feasible implementations of the above-mentioned air-conditioning system control method, the “selectively adjusting the operating frequency of the compressor unit” includes:

[0032] If the load ratios of the compressors are all greater than the third preset ratio, and the required load is less than the current load, controlling the compressors to reduce their operating frequencies simultaneously; or

[0033] If the load ratios of all compressors are less than or equal to a third preset ratio, and the required load is less than the current load, the compressor with the longest cumulative operating time is preferentially controlled to reduce its operating frequency; or

[0034] If the required load is greater than the current load, the compressors are controlled to increase their operating frequencies simultaneously.

[0035] In some feasible implementations of the above-mentioned air-conditioning system control method, the calculation formula of the predicted temperature T2′ is:

[0036] T2′=T1+(T1-T0)×α0

[0037] Where T2′ is the predicted temperature at the second moment, T1 is the room temperature at the first moment, T0 is the room temperature at the reference moment, and α0 is the initial temperature change index;

[0038] The calculation formula of the temperature change index correction value Δα is:

[0039] Δα=k×(T2-T2′) / T2

[0040] Wherein, Δα is the temperature change index correction value, k is the adjustment coefficient, T2 is the room temperature at the second moment, and T2′ is the predicted temperature at the second moment.

[0041] In some feasible implementations of the above-mentioned air-conditioning system control method, the calculation formula of the current temperature change index α is:

[0042] α=α0+Δα×c

[0043] Wherein, α is the current temperature change index, α0 is the initial temperature change index, Δα is the temperature change index correction value, c is a constant, and when the air-conditioning system is in heating mode, c is a positive number, and when the air-conditioning system is in cooling mode, c is a negative number;

[0044] The calculation formula of the predicted temperature T3′ is:

[0045] T3′=T2+(T2-T1)×α

[0046] Wherein, T3′ is the predicted temperature at the third moment, T2 is the room temperature at the second moment, T1 is the room temperature at the first moment, and α is the current temperature change index.

[0047] Beneficial effects of the present invention:

[0048] (1) By real-time monitoring of the room temperature data at different times, and combining the initial temperature change index to predict the temperature at the next moment (i.e., the second moment), the temperature change index correction value is further calculated based on the predicted temperature and the actual monitored room temperature at that moment, thereby obtaining a more accurate current temperature change index. With this more accurate current temperature change index, the trend of room temperature changes at future moments (such as the third moment) can be predicted more scientifically, and based on this temperature prediction, the required load of the compressor can be further calculated. By comparing the required load with the current load, a scientific and reasonable strategy can be provided for the actual load adjustment of the compressor, so that the actual load adjustment of the compressor is more in line with actual needs, effectively avoiding the ineffective operation and excessive energy consumption of the compressor unit, effectively reducing the unnecessary waste of energy, and improving the energy efficiency ratio of the entire air-conditioning system.

[0049] (2) Based on real-time monitoring of temperature data at multiple moments and a dynamic calculation mechanism, the system can automatically and accurately adjust the compressor load according to the dynamic changes in the actual room temperature without excessive human intervention. It can automatically adapt to different environmental conditions, personnel flow conditions, equipment heat dissipation and other complex environmental factors, ensuring that the air-conditioning system can maintain a stable and efficient operating state under various working conditions, effectively improving the adaptability and reliability of the system. While ensuring that the room temperature is always within the target range and creating a more comfortable use environment for users, it effectively avoids high-power operation during partial load periods (such as low traffic at night and non-peak electricity consumption periods), thereby significantly reducing energy waste and improving the energy-saving performance of the air-conditioning system. This not only conforms to the current trend of energy conservation and emission reduction, but also provides strong support for reducing long-term operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0051] Figure 1 This is a flowchart of a method for controlling an air-conditioning system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art will appreciate that these embodiments are intended only to illustrate the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art may adjust these embodiments as needed to suit specific applications. To better illustrate the present invention, numerous specific details are provided in the following detailed description. Those skilled in the art will appreciate that the present invention can be practiced without certain specific details.

[0053] The present invention provides an air-conditioning system, which includes a compressor unit, a condenser, an expansion valve and an evaporator. The compressor unit, the condenser, the expansion valve and the evaporator are sequentially connected in series through pipelines to form a refrigerant circulation loop.

[0054] Among them, the compressor unit includes at least one compressor. When multiple compressors are used, the multiple compressors are connected in parallel, and the outlet of each compressor is connected to the high-pressure exhaust pipeline, so that the high-pressure exhaust pipeline collects the outlet gas of multiple compressors and transports it to the inlet of the condenser; the condenser condenses the high-temperature and high-pressure refrigerant gas into a high-pressure liquid; the expansion valve controls the flow and pressure of the liquid refrigerant so that it forms a low-temperature and low-pressure wet steam before entering the evaporator; the evaporator provides a vaporization place for the refrigerant, so that it absorbs the heat of the cooled medium and then vaporizes into a low-temperature and low-pressure gaseous refrigerant; the inlet of each compressor is connected to the low-pressure suction pipeline, so that the gas at the outlet of the evaporator returns to the inlets of multiple compressors through the low-pressure suction pipeline to complete the cycle.

[0055] like Figure 1 As shown, based on the above air conditioning system structure, an embodiment of the present invention provides a control method for an air conditioning system, the control method comprising:

[0056] S1. Start at least one compressor and run it for a first preset time.

[0057] Because at the initial startup, the refrigerant circulation and pressure changes in the system require a certain amount of time to reach a stable state. For example, after the refrigerant is discharged from the compressor, it needs to pass through components such as the condenser, expansion valve and evaporator to complete the cycle. During this process, the pressure, temperature and other parameters of each component will gradually stabilize. Therefore, after the compressor is started and kept running for the first preset time, the refrigeration system can establish a relatively stable operating condition, thereby ensuring the reliability of subsequent monitoring data. Among them, the specific value of the first preset time is closely related to factors such as the compressor type, ambient temperature, and ambient humidity, and is generally set by the designer after collecting multiple sets of experimental data.

[0058] Furthermore, when the air conditioning system employs a centralized water-cooling structure, the air conditioning system further includes a chilled water subsystem and a cooling water subsystem. The chilled water subsystem includes a chilled water circulation loop and a chilled pump disposed within the chilled water circulation loop, and the cooling water system includes a cooling water circulation loop and a cooling pump disposed within the cooling water circulation loop. Based on this, the control method includes: starting the chilled pump and the cooling pump before or simultaneously with step S1.

[0059] S2. Obtain the target temperature, the initial temperature change index α0, the room temperature T0 at the reference time, and the room temperature T1 at the first time.

[0060] Among them, the target temperature is the target temperature set by the user or the default target temperature of the air-conditioning system in the corresponding working mode. The temperature change index is a quantitative indicator that describes the degree of change of the room temperature over time in the corresponding working mode of the air-conditioning system, and the initial temperature change index α0 is the default temperature change parameter preset by the air-conditioning system, which is obtained by the designer after scientific measurement through multiple sets of experimental data. The reference moment is the moment when the compressor unit has completed the first preset time, or a certain moment after step S1. Taking the moment when the compressor runs for the first preset time as the reference moment as an example, the room temperature obtained by detection at this time is T0; taking the reference moment as the starting point, the first moment after the second preset time, and the room temperature obtained by detection at the first moment is T1. Various temperature detection devices such as temperature sensors and thermometers can be installed in the room, and these temperature detection devices can be used to effectively detect and accurately obtain the room temperature.

[0061] S3. Calculate the predicted temperature T2' at the second moment based on the initial temperature change index α0, the room temperature T0, and the room temperature T1.

[0062] Taking the first moment as the starting point, the second moment is the second preset time. By substituting the initial temperature change index α0, the room temperature T0 at the reference moment, and the room temperature T1 at the first moment into the corresponding formula, the predicted temperature T2′ at the second moment can be calculated.

[0063] Specifically, the calculation formula for the predicted temperature T2′ at the second moment is:

[0064] T2′=T1+(T1-T0)×α0

[0065] Wherein, T2′ is the predicted temperature at the second moment, in °C; T1 is the room temperature at the first moment, in °C; T0 is the room temperature at the reference moment, in °C; α0 is the initial temperature change index.

[0066] S4. Obtain the room temperature T2 at the second moment and the current load of the compressor unit.

[0067] The first moment is taken as the starting point, and the second moment is the second preset time. The room temperature at the second moment is obtained through detection as T2. At the same time, the load of the compressor unit at the second moment is obtained as the current load.

[0068] Specifically, we can first obtain the load ratio of each compressor in operation (the load ratio of a compressor refers to the ratio between the actual load of the compressor under the current operating conditions and the rated full load, usually expressed as a percentage), and then calculate the load value of each compressor in combination with its corresponding rated power. Finally, we can add up the load values ​​of each compressor to obtain the current load of the compressor group in kW.

[0069] S5. Calculate the temperature change index correction value Δα based on the room temperature T2 and the predicted temperature T2′.

[0070] The temperature variation index correction value refers to the value adjusted to the originally set temperature variation index after considering various influencing factors in actual operation, so as to more accurately reflect the actual situation of room temperature changes over time.

[0071] Specifically, the calculation formula of the temperature change index correction value Δα is:

[0072] Δα=k×(T2-T2′) / T2

[0073] Among them, Δα is the temperature change index correction value; T2 is the room temperature at the second moment, in °C; T2′ is the predicted temperature at the second moment, in °C; k is the adjustment coefficient (constant), which plays the role of adjusting the correction amplitude, reflecting the different sensitivities of different air-conditioning systems and different room environments to temperature changes. Therefore, usually during the air-conditioning installation phase, the staff will conduct a series of tests and comprehensively consider various practical factors to set the adjustment coefficient to ensure that the subsequent air-conditioning system can more accurately correct the temperature change index based on this coefficient and achieve effective control of the room temperature. In addition, when performing regular maintenance on the air conditioner, the staff can also further adjust this adjustment coefficient based on the actual operation of the air conditioner during this period, such as whether the room temperature is stable, whether there are abnormal fluctuations, etc., as well as possible changes in the external environment, so as to make it work better.

[0074] S6. Calculate the current temperature change index α based on the initial temperature change index α0 and the temperature change index correction value Δα.

[0075] Specifically, the calculation formula of the current temperature change index α is:

[0076] α=α0+Δα×c

[0077] Where α is the current temperature change index, α0 is the initial temperature change index, Δα is the temperature change index correction value, and c is a constant. When the air conditioning system is in heating mode, c is a positive number; when the air conditioning system is in cooling mode, c is a negative number. For example, when the air conditioning system is in heating mode, the value of c is 1; when the air conditioning system is in cooling mode, the value of c is -1.

[0078] It should be noted that the numerical values ​​in the above examples are merely exemplary and should not be construed to limit the scope of protection of the present invention.

[0079] S7. Calculate the predicted temperature T3′ at the third moment based on the current temperature change index α, the room temperature T1, and the room temperature T2, wherein the intervals between the reference moment, the first moment, the second moment, and the third moment are the second preset time lengths.

[0080] In other words, the interval between the reference moment and the first moment, the interval between the first moment and the second moment, and the interval between the second moment and the third moment are all second preset durations. The specific value of the second preset duration is generally set by the staff based on the user's actual situation during installation and adjusted during subsequent maintenance to provide a better user experience. By substituting the current temperature change index α, the room temperature T1 at the first moment, and the room temperature T2 at the second moment into the corresponding formula, the predicted room temperature T3' at the third moment can be calculated.

[0081] Specifically, the calculation formula for the predicted temperature T3′ is:

[0082] T3′=T2+(T2-T1)×α

[0083] Wherein, T3′ is the predicted temperature at the third moment, T2 is the room temperature at the second moment, T1 is the room temperature at the first moment, and α is the current temperature change index.

[0084] S8. Calculate the difference between the predicted temperature T3′ and the target temperature, and calculate the required load of the compressor unit based on the difference.

[0085] The demand load of the compressor unit refers to the total theoretical load required by the air-conditioning system (i.e., the demand load of all compressors) estimated by the difference between the predicted temperature and the target temperature.

[0086] In one embodiment, the required load of the compressor unit is calculated as follows:

[0087] Q demand =m·c p ΔT

[0088] Among them, Q demand is the required load of the compressor unit, in kW; m is the mass flow rate (mass flow rate of air), in kg / s; c p is the specific heat capacity of air (constant), in J / (kg·℃); ΔT is the difference between the predicted temperature T3′ and the target temperature, in ℃;

[0089] The calculation formula of mass flow rate m is:

[0090] m=V·ρ

[0091] Where m is the mass flow rate (mass flow rate of air), unit is kg / s; V is the air volume in the room, unit is m 3 / s; ρ is the air density (constant), unit is kg / m 3 .

[0092] Based on this, step S4 also includes: obtaining the air volume in the room.

[0093] Specifically, the air volume in the room can be directly obtained through an air volume measuring device, or the wind speed can be obtained and then the air volume is calculated in combination with the cross-sectional area, and then the required load of the compressor unit can be calculated using the above formula.

[0094] In another embodiment, historical data or experimental data can also be used to establish an empirical formula or linear regression model between the difference (the difference between the predicted temperature and the target temperature) and the demand load (the demand load of the compressor unit). The demand load of the compressor unit can be calculated by using the established empirical formula or linear regression model and the difference between the predicted temperature T3′ and the target temperature.

[0095] S9. Compare the required load with the current load, and adjust the actual load of the compressor unit based on the comparison result.

[0096] Specifically, the magnitude relationship between the required load and the current load is compared, and based on the magnitude relationship, step S91, step S92 or step S93 is selectively executed.

[0097] S91. If the required load is less than the current load, reduce the actual load of the compressor unit.

[0098] When the demand load is less than the current load, it indicates that the compressor output has exceeded the actual demand. Reducing the actual load of the compressor unit can avoid energy waste and prevent the room temperature from excessively dropping or rising. At the same time, it can avoid wasting energy, reduce equipment operating pressure, and reduce wear and energy costs.

[0099] S92. If the required load is greater than the current load, increase the actual load of the compressor unit.

[0100] When the demand load is greater than the current load, it indicates that the compressor output is insufficient to meet the room temperature regulation needs. Increasing the load can quickly add cooling or heat to ensure that the indoor temperature meets the standard and avoid situations where comfort is reduced or user needs cannot be met due to insufficient energy supply.

[0101] S93. If the required load is equal to the current load, the current load of the compressor unit is maintained unchanged.

[0102] When the demand load is equal to the current load, it indicates that the compressor output fully matches the demand. Maintaining the current load can maintain stable system operation, avoid energy consumption fluctuations and equipment loss caused by frequent adjustments, and ensure that the indoor temperature remains stable within the target range.

[0103] Furthermore, when the demand load is not equal to the current load, the implementation method of adjusting the actual load of the compressor group includes: adjusting the operating frequency of the compressor, and / or adjusting the number of starts of the compressor. In other words, you can choose to adjust the operating frequency of the compressor or adjust the number of starts of the compressor, or you can adjust the operating frequency of the compressor and adjust the number of starts of the compressor at the same time, so as to achieve the effect of adjusting the actual load of the compressor group, specifically, including steps S901 to S904.

[0104] S901: When there is only one compressor in operation, adjust the operating frequency of the compressor in operation based on a comparison result between a required load and a current load.

[0105] Specifically, based on the comparison result between the required load and the current load, step S9011 or S9012 is selectively executed.

[0106] S9011. If the required load is less than the current load, reduce the operating frequency of the compressor in operation.

[0107] When the demand load is less than the current load, this indicates that the compressor output has exceeded the actual demand. The operating frequency of the running compressor is reduced to prevent the room temperature from dropping or rising excessively, while avoiding energy waste, reducing equipment operating pressure, and reducing wear and energy consumption costs.

[0108] S9012: If the required load is greater than the current load, increase the operating frequency of the compressor in operation.

[0109] When the demand load is greater than the current load, this indicates that the compressor output is insufficient to meet the room temperature regulation needs. Increasing the operating frequency of the running compressor can quickly replenish cooling or heat, ensuring that the indoor temperature meets the standard and avoiding situations where comfort is reduced or user needs cannot be met due to insufficient energy supply.

[0110] S902: When the compressor group includes at least two compressors and the number of compressors in operation is not less than two, adjust the operating frequencies of the at least two compressors in operation simultaneously or selectively.

[0111] Specifically, before adjusting the actual load of the compressor group based on the comparison result, the load ratio of each compressor is obtained, and the load ratio is compared with a third preset ratio. Based on the comparison result of the load ratio and the third preset ratio, and based on the comparison result of the demand load and the current load, the operating frequency of the compressor group is selectively adjusted.

[0112] The compressor load ratio refers to the ratio of the actual load of the compressor under current operating conditions to the rated full load, typically expressed as a percentage. The third preset ratio is a preset percentage constant (e.g., 50%). The third preset ratio is used to distinguish whether the compressor load is at a high level and to determine the specific implementation method for reducing the operating frequency of each compressor.

[0113] S9021. If the load ratios of the compressors are all greater than the third preset ratio, and the required load is less than the current load, control the compressors to reduce their operating frequencies simultaneously.

[0114] When the load ratio of each compressor is greater than the third preset ratio and the required load is less than the current load, this indicates that the output capacity of the current compressor exceeds the actual demand and the current operating load of each compressor is relatively high. At this time, by reducing the operating frequency of each compressor at the same time, not only can the overall energy consumption be reduced and unnecessary energy waste be avoided, but also the compressor can be prevented from overheating and increased wear due to long-term high-load operation, thereby extending the service life of the equipment.

[0115] S9022: If the load ratios of all compressors are less than or equal to the third preset ratio, and the required load is less than the current load, the compressor with the longest cumulative operating time is preferentially controlled to reduce its operating frequency.

[0116] When the load ratio of each compressor is less than or equal to the third preset ratio, and the required load is less than the current load, this indicates that although the current operating load of each compressor is low, the output capacity of the current compressor still exceeds the actual demand. At this time, the operating frequency of the compressor with the longest cumulative operating time can be reduced first. In this way, while reducing energy consumption, the usage time of each compressor can also be balanced, thereby reducing the overall maintenance cost and extending the service life of the entire compressor unit.

[0117] S9023. If the required load is greater than the current load, control each compressor to increase the operating frequency simultaneously.

[0118] When the demand load is greater than the current load, this indicates that the output capacity of the current compressor can no longer meet the actual demand. At this time, the operating frequency of each compressor can be increased at the same time to quickly increase the output capacity of the system to meet the actual demand. The simultaneous increase adjustment method can avoid damage to a single compressor due to overload and ensure that the overall operation of the system remains stable.

[0119] S903: If the required load is greater than the current load, and the load ratio of the compressors in operation is greater than or equal to a first preset ratio, increase the number of compressor starts.

[0120] When the demand load is greater than the current load, and the load ratio of the running compressors is greater than or equal to a first preset ratio, this means that the currently running compressors cannot meet the actual cooling or heating demand, and each running compressor has approached or reached its maximum output capacity and cannot be increased by increasing the operating frequency. At this time, the total output capacity of the system can be quickly increased by increasing the number of compressor starts, thereby quickly meeting the actual demand. The first preset ratio is set to distinguish whether the compressor is in a high-load state and to confirm whether its operating frequency can be further increased. The value range of the first preset ratio is 90% to 100%, for example, the first preset ratio is 90% or 100%.

[0121] It should be noted that the numerical values ​​in the above examples are merely exemplary and should not be construed to limit the scope of protection of the present invention.

[0122] Furthermore, when the number of activated compressors is increased, the loads of the respective compressors are made equal, and the total load of the compressor group is equal to the demand load.

[0123] When the number of compressor starts is increased, by evenly distributing the load and making the total load of the compressor group equal to the demand load, some compressors can be prevented from operating at low load for a long time (low efficiency) or high load (energy consumption surge), so that all compressors can operate in the high-efficiency range, reducing energy waste. It can also avoid problems such as overheating and increased wear caused by long-term high-load operation of a single compressor, thereby improving the overall stability and reliability of the system.

[0124] It is understandable that, since when increasing the actual load of the compressor group, the operating frequency of each compressor is generally increased first, and then the number of compressor starts is increased, therefore, step S903 is generally executed after step S9023.

[0125] S904: When there are no less than two compressors in operation and the required load is less than the current load, if the load ratio of one of the compressors is less than or equal to a second preset ratio, reduce the number of compressors started.

[0126] When the demand load is less than the current load, it indicates that the output capacity of the currently running compressor exceeds the actual demand, posing a risk of energy waste. Furthermore, if the load ratio of one compressor is less than or equal to a second preset ratio, this indicates that the compressor's output capacity is far below its maximum capacity, creating redundancy. Reducing the number of compressor startups can reduce overall energy consumption and avoid unnecessary energy waste. The second preset ratio is used to distinguish whether each compressor is in an inefficient range and to determine whether the number of compressor startups can be reduced. The second preset ratio ranges from 20% to 25%, for example, 20% or 25%.

[0127] It is understandable that after reducing the number of compressor starts, if the total load of the remaining compressors in operation is less than the required load, the operating frequency of the remaining compressors in operation can be adjusted through step 901 or step S9023.

[0128] The present invention monitors the temperature data of the room at different moments in real time, and predicts the temperature at the next moment (i.e., the second moment) in combination with the initial temperature change index, and then further calculates the temperature change index correction value based on the predicted temperature and the actual monitored room temperature at that moment, thereby obtaining a more accurate current temperature change index. With this more accurate current temperature change index, it is possible to more scientifically predict the changing trend of the room temperature at future moments (such as the third moment), and based on this temperature prediction, it is possible to further infer the required load of the compressor. By comparing the required load with the current load, it is possible to provide a set of scientific and reasonable strategies for adjusting the actual load of the compressor, so that the actual load adjustment of the compressor is more in line with actual needs, effectively avoiding the ineffective operation and excessive energy consumption of the compressor unit, effectively reducing the unnecessary waste of energy, and improving the energy efficiency ratio of the entire air-conditioning system.

[0129] Moreover, based on real-time monitoring of temperature data at multiple moments and a dynamic calculation mechanism, the system can automatically and accurately adjust the compressor load according to the dynamic changes in the actual room temperature without excessive human intervention. It can automatically adapt to different environmental conditions, personnel flow, equipment heat dissipation and other complex environmental factors to ensure that the air-conditioning system can maintain a stable and efficient operating state under various working conditions, effectively improving the adaptability and reliability of the system. While ensuring that the room temperature is always within the target range and creating a more comfortable use environment for users, it effectively avoids high-power operation during partial load periods (such as low traffic at night and non-peak electricity consumption periods), thereby greatly reducing energy waste and improving the energy-saving performance of the air-conditioning system. This not only conforms to the current trend of energy conservation and emission reduction, but also provides strong support for reducing long-term operating costs.

[0130] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A method for controlling an air conditioning system, characterized in that: The air conditioning system includes a compressor unit, the compressor unit includes at least one compressor, and the control method includes: Starting at least one compressor and running it for a first preset time period; Obtaining the target temperature, the initial temperature change index α0, the room temperature T0 at the reference time, and the room temperature T1 at the first time; Calculating a predicted temperature T2′ at a second moment based on the initial temperature change index α0, the room temperature T0, and the room temperature T1; Obtaining the room temperature T2 at the second moment and the current load of the compressor unit; Calculating a temperature change index correction value Δα based on the room temperature T2 and the predicted temperature T2′; Calculating a current temperature variation index α based on the initial temperature variation index α0 and the temperature variation index correction value Δα; Calculating a predicted temperature T3′ at a third moment based on the current temperature change index α, the room temperature T1, and the room temperature T2, wherein the intervals between the reference moment, the first moment, the second moment, and the third moment are a second preset time length; calculating a difference between the predicted temperature T3′ and the target temperature, and calculating a required load of the compressor unit based on the difference; The required load is compared with the current load, and based on the comparison result, the actual load of the compressor group is adjusted.

2. The control method of the air conditioning system according to claim 1, characterized in that: The “adjusting the actual load of the compressor unit based on the comparison result” includes: If the required load is less than the current load, reducing the actual load of the compressor unit; or If the required load is greater than the current load, increasing the actual load of the compressor unit; or If the required load is equal to the current load, the current load of the compressor group is maintained unchanged.

3. The control method of the air conditioning system according to claim 1, characterized in that: The compressor group includes at least two compressors, and the “adjusting the actual load of the compressor group” includes: Adjust the number of starts of the compressor.

4. The control method of the air conditioning system according to claim 3, characterized in that: The “adjusting the number of startups of the compressor” includes: If the required load is greater than the current load, and the load ratio of the compressors in operation is greater than or equal to a first preset ratio, the number of startups of the compressors is increased.

5. The control method of the air conditioning system according to claim 4, characterized in that: The control method further includes: In the case of increasing the number of activations of the compressors, the loads of the compressors are made equal, and the total load of the compressor group is equal to the demand load.

6. The control method of the air conditioning system according to claim 3, characterized in that: The “adjusting the number of startups of the compressor” includes: When there are no less than two compressors in operation and the required load is less than the current load, if the load ratio of one of the compressors is less than or equal to a second preset ratio, the number of compressors started is reduced.

7. The control method of the air conditioning system according to claim 1, characterized in that: The compressor group includes at least two compressors. When the number of compressors in operation is not less than two, the control method further includes: Before adjusting the actual load of the compressor group based on the comparison result, obtaining the load ratio of each compressor; comparing the load ratio with a third preset ratio; The operating frequency of the compressor group is selectively adjusted based on a comparison result of the load ratio and the third preset ratio, and based on a comparison result of the required load and the current load.

8. The control method of the air conditioning system according to claim 7, characterized in that: The "selective adjustment of the operating frequency of the compressor unit" includes: If the load ratios of the compressors are all greater than the third preset ratio, and the required load is less than the current load, controlling the compressors to reduce their operating frequencies simultaneously; or If the load ratios of all compressors are less than or equal to a third preset ratio, and the required load is less than the current load, the compressor with the longest cumulative operating time is preferentially controlled to reduce its operating frequency; or If the required load is greater than the current load, the compressors are controlled to increase their operating frequencies simultaneously.

9. The control method of the air conditioning system according to any one of claims 1 to 8, characterized in that: The calculation formula of the predicted temperature T2′ is: T2′=T1+(T1-T0)×α0 Where T2′ is the predicted temperature at the second moment, T1 is the room temperature at the first moment, T0 is the room temperature at the reference moment, and α0 is the initial temperature change index; The calculation formula of the temperature change index correction value Δα is: Δα=k×(T2-T2′) / T2 Wherein, Δα is the temperature change index correction value, k is the adjustment coefficient, T2 is the room temperature at the second moment, and T2′ is the predicted temperature at the second moment.

10. The control method of the air conditioning system according to claim 9, characterized in that: The calculation formula of the current temperature change index α is: α=α0+Δα×c Wherein, α is the current temperature change index, α0 is the initial temperature change index, Δα is the temperature change index correction value, c is a constant, and when the air-conditioning system is in heating mode, c is a positive number, and when the air-conditioning system is in cooling mode, c is a negative number; The calculation formula of the predicted temperature T3′ is: T3′=T2+(T2-T1)×α Wherein, T3′ is the predicted temperature at the third moment, T2 is the room temperature at the second moment, T1 is the room temperature at the first moment, and α is the current temperature change index.

Images