Air conditioning compressor frequency control method, readable storage medium and air conditioning system

Abstract

The present invention provides an air conditioner compressor frequency control method, a readable storage medium and an air conditioning system. The control method includes an energy-saving step, which includes the following steps: a calibration recording step: obtaining a calibration temperature T according to the operating parameters of the air conditioner when it was last shut down and / or according to the parameters of the machine room. 停 And calibrate the compressor operating frequency F 停 ; The first execution step: When the air conditioner starts working, collect the internal ambient temperature T in the room 内 , according to the formula △T=T 内 ‑T 停 , calculate △T; get the first judgment temperature T according to the setting k , T k is a constant value, and T k >0; when △T>T k When the compressor is operated at this time, adjust the operating frequency F 初 =F 停 ; When △T≤T k When adjusting F 初 <F 停 The present invention can obtain a reference frequency for starting the compressor according to the heat load generated by the current machine room and / or the historical operating parameters of the air conditioner, and can further control the compressor of the air conditioner to enter a high-efficiency operating state in advance to achieve energy-saving operation.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an air conditioner compressor frequency control method, a readable storage medium and an air conditioning system. Background Art

[0002] At present, in special places such as computer rooms and equipment rooms, due to the particularity of their use environment, there are heat sources such as equipment heating on the indoor side for a long time, so air conditioners need to work for a long time 24 hours a day to adjust the indoor temperature; with the development of communications and digital industries, the power consumption of computer rooms is increasing; statistics show that the power consumption of air conditioners in computer rooms accounts for about 50% of the total power consumption of computer rooms, and how to save the power consumption of air conditioning equipment has become an urgent problem to be solved; the existing air conditioning system used for computer room temperature control usually has fixed working parameters or requires maintenance personnel to adjust it regularly, but the heat load of the computer room is changing dynamically (for example: the heat generated by the workload of computer room equipment, outdoor temperature and humidity, computer room access control switches, etc. are all factors that affect the heat load). The traditional air conditioning setting parameter is unchanged or adjusted manually once in a long time. Due to the lack of automatic adjustment, the air conditioning cooling output is usually set to a large value to cope with possible high load conditions in the computer room (sudden high temperature weather or increased load of computer room equipment), but in most cases the actual heat load of the computer room is not that large. This excessive setting has a huge deviation, and the energy-saving strategy is not accurate enough, which will cause unnecessary waste of electricity.

[0003] Furthermore, in the prior art, in order to improve comfort, the air-conditioning system generally controls the air-conditioning to run at a higher frequency at the initial stage of startup, thereby improving the cooling effect at the initial stage of startup, and the energy efficiency of high-frequency operation is generally low; on the other hand, high-frequency operation at startup increases the cooling output, which can easily cause the local temperature to drop too quickly, and easily drop quickly below the set temperature line, thereby causing the air conditioner to frequently start and stop near the set temperature line, further increasing the energy consumption of the air conditioner; and the common computer room environment is mainly to cool the equipment, and there is no need to excessively pursue temperature reduction efficiency. Therefore, it is necessary to balance the design in terms of temperature reduction efficiency and energy saving. It is very necessary to develop corresponding control strategies for air conditioners used in computer room environments, so as to reduce the operating energy consumption of the air-conditioning system while meeting actual use requirements. Summary of the invention

[0004] The present invention provides an air-conditioning compressor frequency control method, a readable storage medium and an air-conditioning system to solve the problem that the air-conditioning system used for temperature control in a computer room in the prior art has high energy consumption and is not conducive to energy saving.

[0005] In order to solve the above problems, according to one aspect of the present invention, a method for controlling the frequency of an air conditioner compressor is provided, comprising an energy-saving step, the energy-saving step comprising the following steps: a calibration recording step: obtaining a calibration temperature T according to the operating parameters of the air conditioner when it was last shut down and / or according to the parameters of the machine room. 停 And calibrate the compressor operating frequency F 停 ; The first execution step: When the air conditioner starts working, collect the internal ambient temperature T in the room 内 According to the formula △T=T 内 -T 停 , calculate △T; get the first judgment temperature T according to the setting k , T k is a constant value, and T k >0; when △T>T k When the compressor is operated at this time, adjust the operating frequency F 初 =F 停 ; When △T≤T k When adjusting F 初 <F 停 .

[0006] Furthermore, according to the parameters of the compressor in the air conditioner, the lower limit frequency F of the compressor operation is obtained. 下 , F 下 <F 停 ; In the first execution step: when 0≤△T≤T k When adjusting F 初 =(F 停 +F 下 ) / 2; when △T<0, adjust F 初 =F 下 .

[0007] Further, in the first execution step: 3°C ≤ T k ≤7℃.

[0008] Furthermore, the air-conditioning compressor frequency control method further includes a temperature determination step and a rapid temperature control step. The temperature determination step includes: setting the energy-saving temperature T according to the parameters of the machine room. 节 , when T 内 <T 节 When T 内 ≥T 节 When the temperature is rapidly controlled, the operating frequency F of the compressor is 初 >F 停 As the compressor works, the temperature in the room T 内 Gradually decreases, when T 内 <T 节 When the temperature is high, the rapid temperature control step is stopped and the energy-saving step is executed.

[0009] Optionally, the air conditioner compressor frequency control method further includes a temperature determination step and a rapid temperature control step, wherein the temperature determination step includes: setting an energy-saving temperature T according to the parameters of the machine room. 节 ; According to the setting, the second judgment temperature T is obtained 余 , T 余 is a constant value, and T 余 >0; when T 内 <T 节 -T 余 When T 内 ≥T 节 -T 余 When the temperature is rapidly controlled, the operating frequency F of the compressor is 初 >F 停 As the compressor works, the internal ambient temperature T 内 Gradually decreases, when T 内 <T 节 When the temperature is high, the rapid temperature control step is stopped and the energy-saving step is executed.

[0010] Furthermore, 1℃≤T 余 ≤3℃.

[0011] Furthermore, 30°C<T 节 ≤38℃; According to the compressor parameters, the upper limit frequency F of the compressor operation is obtained 上 , F 上 ≥F 停 , in the rapid temperature control step, the operating frequency of the compressor F 初 =F 上 .

[0012] Furthermore, the energy-saving step further includes a temperature change speed control step; after the first execution step is executed for time t0, the temperature change speed control step is executed; the temperature change speed control step includes: collecting the internal environment temperature in the computer room at this time to obtain T1, then waiting for time t1, and then collecting the internal environment temperature in the computer room to obtain T2, according to formula V 速 = (T1-T2) / t1, calculate the temperature change rate V 速 ; Get the target speed V according to the setting 标 , V 标 is a fixed value; when V 速 >V 标 When the compressor is running, the operating frequency F 初 ; When V 标 / 2≤V 速 ≤V 标 When the compressor is kept at the operating frequency F 初 unchanged; when V 速<V 标 / 2, increase the compressor's operating frequency F 初 .

[0013] Furthermore, according to formula V 标 = (T2-T 设 ) / t 标 Calculate the target speed V 标 , T 设 =T 停 +T 差 , T 差 is the set value, 30 min≤t 标 ≤120min; 5 min≤t0≤20min; 1 min≤t1≤3min.

[0014] Furthermore, when V 速 >V 标 When the compressor operating frequency decreases, A=kF 降 , and A is an integer; k=V 速 / V 标 , 2 Hz≤F 降 ≤4Hz; when V 速 <V 标 / 2, the increase in the compressor operating frequency is B, B=F 升 / 2k, and B is an integer; 2Hz≤F 升 ≤4Hz.

[0015] According to another aspect of the present invention, a readable storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed, the above-mentioned air-conditioning compressor frequency control method can be implemented.

[0016] According to another aspect of the present invention, an air conditioning system is provided, including a memory and a processor, wherein the processor is electrically connected to the memory; the processor is configured to execute the above-mentioned air conditioning compressor frequency control method based on instructions stored in the memory.

[0017] Applying the technical solution of the present invention, the present invention provides an air conditioner compressor frequency control method, including an energy-saving step, the energy-saving step includes the following steps: a calibration recording step: obtaining a calibration temperature T according to the operating parameters of the air conditioner when it was last shut down and / or according to the parameters of the machine room. 停 And calibrate the compressor operating frequency F 停 ; The first execution step: When the air conditioner starts working, collect the internal ambient temperature T in the room 内 According to the formula △T=T 内 -T 停 , calculate △T; get the first judgment temperature T according to the setting k, T k is a constant value, and T k >0; when △T>T k When the compressor is operated at this time, adjust the operating frequency F 初 =F 停 ; When △T≤T k When adjusting F 初 <F 停 .

[0018] In actual use, it is found that the operating parameters of the air conditioner when it was last shut down are highly adapted to the actual working conditions of the computer room. Therefore, the present invention realizes the effective recording and reference of the operating parameters when the air conditioner was last shut down by setting a calibration recording step, so that the subsequent frequency change of the compressor can have a reasonable reference correspondence, and there is no need to start the compressor at the highest frequency as in the prior art, thereby effectively reducing the operating frequency of the compressor, reducing energy consumption and achieving energy saving; at the same time, when the operating parameters of the air conditioner when it was last shut down cannot be obtained or the operating parameters of the air conditioner when it was last shut down are abnormal and have no reference significance, the calibration temperature and the calibrated compressor operating frequency can be effectively calibrated for reference based on the parameters of the computer room, combined with actual experience and experimental data; by setting the first execution step, different operating frequencies of the compressor can be determined based on the temperature difference, thereby making the operating frequency of the compressor more in line with the actual use requirements and achieving energy saving of the compressor; in the first execution step, the first judgment temperature can be determined based on the actual allowed computer room The temperature fluctuation range of the room, the allowable error range when the air conditioner adjusts the temperature, actual use and experimental experience and other factors can be flexibly selected, thereby realizing flexible setting of the temperature difference criterion, which can further improve the application scope and energy-saving effect of the air-conditioning compressor frequency control method proposed in the present invention; the present invention proposes a compressor frequency control method, which can obtain the reference frequency of the compressor start-up according to the heat load generated by the current machine room and / or the historical operating parameters of the air conditioner, thereby controlling the compressor of the air conditioner to enter a high-efficiency operating state in advance to achieve energy-saving operation; compared with the high-power or full-power compressor starting method (i.e., high-frequency or maximum frequency starting method) in the prior art, the method of the present invention controls the operation of the compressor by adopting a low-power compressor frequency, and realizes low-power operation of the compressor while meeting the temperature drop requirements of the machine room, thereby reducing the overall energy consumption of the air conditioner; the method of the present invention has simple steps and low use cost, can be applied on the basis of the existing variable frequency air conditioner, has obvious energy-saving effect and meets the actual temperature control requirements of the machine room, and is suitable for large-scale promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic flow chart of some steps of a method for controlling the frequency of an air conditioner compressor provided by an embodiment of the present invention is shown;

[0021] Figure 2 A logic block diagram of some steps of the air-conditioning compressor frequency control method provided in the first embodiment of the present invention is shown. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] like Figure 1 to Figure 2 As shown, an embodiment of the present invention provides an air conditioner compressor frequency control method, including an energy-saving step, the energy-saving step includes the following steps: a calibration recording step: obtaining a calibration temperature T according to the operating parameters of the air conditioner when it was last shut down and / or according to the parameters of the machine room. 停 And calibrate the compressor operating frequency F 停 ; The first execution step: When the air conditioner starts working, collect the internal ambient temperature T in the room 内 According to the formula △T=T 内 -T 停 , calculate △T; get the first judgment temperature T according to the setting k , T k is a constant value, and T k >0; when △T>T k When the compressor is operated at this time, adjust the operating frequency F 初 =F 停 ; When △T≤T k When adjusting F 初 <F 停 .

[0024] In actual use, it is found that the operating parameters of the air conditioner when it was last shut down are highly adapted to the actual working conditions of the computer room. Therefore, the present invention realizes the effective recording and reference of the operating parameters when the air conditioner was last shut down by setting a calibration recording step, so that the subsequent frequency change of the compressor can have a reasonable reference correspondence, and there is no need to start the compressor at the highest frequency as in the prior art, thereby effectively reducing the operating frequency of the compressor, reducing energy consumption and achieving energy saving; at the same time, when the operating parameters of the air conditioner when it was last shut down cannot be obtained or the operating parameters of the air conditioner when it was last shut down are abnormal and have no reference significance, the calibration temperature and the calibrated compressor operating frequency can be effectively calibrated for reference based on the parameters of the computer room, combined with actual experience and experimental data; by setting the first execution step, different operating frequencies of the compressor can be determined based on the temperature difference, thereby making the operating frequency of the compressor more in line with the actual use requirements and achieving energy saving of the compressor; in the first execution step, the first judgment temperature can be determined based on the actual allowed computer room The temperature fluctuation range of the room, the allowable error range when the air conditioner adjusts the temperature, actual use and experimental experience and other factors can be flexibly selected, thereby realizing flexible setting of the temperature difference criterion, which can further improve the application scope and energy-saving effect of the air-conditioning compressor frequency control method proposed in the present invention; the present invention proposes a compressor frequency control method, which can obtain the reference frequency of the compressor start-up according to the heat load generated by the current machine room and / or the historical operating parameters of the air conditioner, thereby controlling the compressor of the air conditioner to enter a high-efficiency operating state in advance to achieve energy-saving operation; compared with the high-power or full-power compressor starting method (i.e., high-frequency or maximum frequency starting method) in the prior art, the method of the present invention controls the operation of the compressor by adopting a low-power compressor frequency, and realizes low-power operation of the compressor while meeting the temperature drop requirements of the machine room, thereby reducing the overall energy consumption of the air conditioner; the method of the present invention has simple steps and low use cost, can be applied on the basis of the existing variable frequency air conditioner, has obvious energy-saving effect and meets the actual temperature control requirements of the machine room, and is suitable for large-scale promotion and use.

[0025] It should be noted that the air-conditioning compressor frequency control method provided by the present invention can also determine the initial target frequency according to the ambient temperature in the machine room when the air conditioner is turned on, the external ambient temperature of the compressor and the manually set temperature, and then adjust it according to the temperature rise and fall in the machine room; and in order to improve the comfort in the early stage of the air conditioner startup, the initial operating frequency of the compressor can be appropriately increased, and even the existing compressor rapid frequency increase technology can be used to allow the air conditioner compressor to quickly rise to a higher frequency when it is turned on (of course, this consumes more energy).

[0026] In addition, it is worth noting that: after calculating the difference △T between the current room temperature and the last shutdown temperature recorded by the air conditioner, by determining the size of △T, the larger △T is, the higher the current room temperature is compared to the last shutdown temperature, so the required compressor operating frequency is higher, in order to cool down the room; however, due to the use of the last air conditioner shutdown frequency F 停 Operation is sufficient to ensure that the air conditioner has sufficient cooling output to cool the room. Therefore, when the temperature difference △T is large, the compressor can use F 停 Operation can take into account both the temperature drop rate and energy saving; when the temperature difference △T is small, a lower initial frequency operation can be adopted, that is, different initial operating frequencies can be determined by different differences.

[0027] Specifically, according to the parameters of the compressor in the air conditioner, the lower limit frequency F of the compressor operation is obtained. 下 , F 下 <F 停 ; In the first execution step: when 0≤△T≤T k When adjusting F 初 =(F 停 +F 下 ) / 2; when △T<0, adjust F 初 =F 下 .

[0028] This setting further limits the frequency of the compressor under different temperature differences (that is, it also indirectly limits the power of the compressor), realizes gradient control of the compressor frequency, and further enables the compressor to steadily adjust the frequency according to the current load and historical operating parameters, thereby controlling the air conditioner to enter an efficient operating state in advance and achieving energy-saving operation.

[0029] Specifically, in the first execution step: 3°C ≤ T k ≤7℃.

[0030] The first determination temperature T k The temperature range is determined based on the actual allowable temperature fluctuation range in the room, the allowable error range when the air conditioner adjusts the temperature, actual use and experimental experience, etc. The first judgment temperature T is selected within this range. k It is closer to the actual use requirements and the energy-saving working range of the air conditioner.

[0031] In a specific embodiment of the present invention, preferably T k =4℃.

[0032] Optionally, the air conditioner compressor frequency control method further includes a temperature determination step and a rapid temperature control step, wherein the temperature determination step includes: setting an energy-saving temperature T according to the parameters of the machine room. 节 , when T 内 <T节 When T 内 ≥T 节 When the temperature is rapidly controlled, the operating frequency F of the compressor is 初 >F 停 As the compressor works, the internal ambient temperature T 内 Gradually decreases, when T 内 <T 节 When the temperature is high, the rapid temperature control step is stopped and the energy-saving step is executed.

[0033] By setting the temperature determination step and the rapid temperature control step in coordination, when the temperature in the computer room needs to be cooled quickly, it is no longer restricted by energy-saving restrictions. The compressor can be directly controlled to work at high frequency and high power to ensure the stability of the computer room temperature. Moreover, after the temperature of the computer room is stabilized within an appropriate range, it can be switched to the energy-saving step in time to achieve subsequent energy saving.

[0034] Optionally, the air conditioner compressor frequency control method further includes a temperature determination step and a rapid temperature control step, wherein the temperature determination step includes: setting an energy-saving temperature T according to the parameters of the machine room. 节 ; According to the setting, the second judgment temperature T is obtained 余 , T 余 is a constant value, and T 余 >0; when T 内 <T 节 -T 余 When T 内 ≥T 节 -T 余 When the temperature is rapidly controlled, the operating frequency F of the compressor is 初 >F 停 As the compressor works, the temperature in the room T 内 Gradually decreases, when T 内 <T 节 When the temperature is high, the rapid temperature control step is stopped and the energy-saving step is executed.

[0035] The second judgment temperature T is obtained by setting 余 , making it more scientific to judge whether the temperature in the machine room is abnormal and whether the temperature in the machine room needs to be quickly cooled; by flexibly setting the second judgment temperature T 余 , so that the method of the present invention can be adapted to different computer rooms.

[0036] Specifically, 1℃≤T 余 ≤3℃.

[0037] The second determination temperature T 余The temperature range is determined based on the actual allowable temperature fluctuation range in the computer room, actual use and experimental experience, and the second judgment temperature T selected within this range is 余 Closer to the actual temperature requirements of the computer room.

[0038] Specifically, 30℃<T 节 ≤38℃; According to the compressor parameters, the upper limit frequency F of the compressor operation is obtained 上 , F 上 ≥F 停 , in the rapid temperature control step, the operating frequency of the compressor F 初 =F 上 This setting ensures that the compressor can quickly cool the room during the rapid temperature control step; in actual use, the upper limit frequency F of the compressor operation 上 It can be the maximum operating frequency allowed by the compressor.

[0039] In a specific embodiment of the present invention, 30°C < T 节 ≤38℃, recommended T 节 =35℃. It should be noted that the best working temperature of general equipment in the computer room is below 40℃, so the room temperature is controlled below 35℃. The higher the temperature, the more energy-saving it is, but it will affect the working efficiency of the equipment. The lower the room temperature, the more energy it consumes. Therefore, it is recommended to enter the energy-saving mode (i.e., execute the energy-saving steps) when the energy-saving temperature is 35℃.

[0040] Furthermore, the energy-saving step further includes a temperature change speed control step; after the first execution step is executed for time t0, the temperature change speed control step is executed; the temperature change speed control step includes: collecting the internal environment temperature in the computer room at this time to obtain T1, then waiting for time t1, and then collecting the internal environment temperature in the computer room to obtain T2, according to formula V 速 = (T1-T2) / t1, calculate the temperature change rate V 速 ; Get the target speed V according to the setting 标 , V 标 is a fixed value; when V 速 >V 标 When the compressor is running, the operating frequency F 初 ; When V 标 / 2≤V 速 ≤V 标 When the compressor is kept at the operating frequency F 初 unchanged; when V 速 <V 标 / 2, increase the compressor's operating frequency F 初 .

[0041] It should be noted that after the air conditioner runs steadily (usually about 10 minutes), the temperature drop rate can be compared with the target speed V according to the cooling capacity output by the current air conditioner. 标 For comparison, if the temperature change rate V 速 If the temperature change speed V 速 If the speed is too slow, the compressor frequency can be increased; the target speed V 标 represents how long the air conditioner is expected to run to make the room reach the set temperature range. The longer the time is, the more energy-saving it is. Therefore, the temperature change speed control step is based on the condition that the current ambient temperature in the room meets the suitable working temperature of the equipment, considering the temperature change speed V in the energy-saving mode. 速 It is not set based on the technical logic that needs to be met first; by setting the temperature change speed control steps, not only the cooling capacity of the air conditioner can offset the heat generated by the equipment in the computer room, but also energy saving is achieved.

[0042] Specifically, according to the formula V 标 = (T2-T 设 ) / t 标 Calculate the target speed V 标 , T 设 =T 停 +T 差 , T 差 is the set value, 30 min≤t 标 ≤120min; 5 min≤t0≤20min; 1 min≤t1≤3min. This setting makes the target speed V 标 , temperature change rate V 速 can all be calculated accurately and reliably.

[0043] It should be noted that: T 差 It can be determined based on the allowable error range of the air conditioner when adjusting the temperature, actual use and experimental experience, etc. Specifically, 0℃≤T 差 ≤5℃.

[0044] In a specific embodiment of the present invention, preferably t0=10min, preferably t1=1min, preferably t 标 =60min.

[0045] In addition, it is worth noting that when the air conditioner is used to adjust the temperature, the allowable error range is set to T 差 When the allowable error range is set to a difference value N, the size of the difference N will affect the operation of the air conditioner; the size of the difference N has the following effects on the operation of the air conditioner:

[0046] 1. Energy efficiency ratio: The size of the difference N will directly affect the energy efficiency ratio of the air conditioner; if the difference N is small, it may mean that the air conditioner needs to start and stop more frequently to maintain a constant temperature, which will lead to increased energy consumption; on the contrary, if the difference N is large, the air conditioner can maintain stable operation for a longer time, thereby reducing energy consumption;

[0047] 2. Temperature comfort: The size of the difference N will affect the comfort of the room's indoor temperature. If the difference N is small, the air conditioner will try to maintain the accuracy of the set temperature to make the indoor temperature more stable. However, if the difference N is too large, the indoor temperature may fluctuate greatly around the set temperature, resulting in reduced comfort;

[0048] 3. Air conditioner life: The service life of the air conditioner will be affected by the difference N. If the difference N is small, the air conditioner needs to be started and shut down more frequently, which will increase the wear and tear of the air conditioner and thus reduce its service life; on the contrary, if the difference N is large, the air conditioner can reduce the number of startups and shutdowns, thereby extending its service life;

[0049] 4. Noise: The size of the difference N affects the noise level of the air conditioner; if the difference N is small, the air conditioner needs to start and shut down more frequently, which may lead to a higher noise level; if the difference N is large, the air conditioner can start and shut down less frequently, thereby reducing noise;

[0050] 5. Control accuracy: The size of the difference N will affect the temperature control accuracy of the air conditioner. If the difference N is small, the air conditioner needs to control the temperature more accurately to keep it near the set temperature, which may increase the complexity of the air conditioner control system; on the contrary, if the difference N is large, the temperature control accuracy of the air conditioner can be relatively loose, and the complexity of the control system is low;

[0051] 6. Indoor air quality: The size of the difference N may affect the indoor air quality. If the difference N is small, the air conditioner needs to start and stop more frequently, which may lead to faster indoor air flow and help to renew the indoor air; however, if the difference N is large, the indoor temperature fluctuates greatly, which may lead to unstable indoor air quality;

[0052] In summary, the size of the difference N has many effects on the operation of the air conditioner, including energy efficiency ratio, temperature comfort, air conditioner life, noise, control accuracy and indoor air quality; in practical applications, it is necessary to select a suitable difference N according to the specific needs of the computer room and the use environment to achieve the best air conditioning performance and use comfort.

[0053] Optionally, when V 速 >V 标 When the compressor operating frequency decreases, A=kF 降 , and A is an integer; k=V 速 / V标 , 2Hz≤F 降 ≤4Hz; when V 速 <V 标 / 2, the increase in the compressor operating frequency is B, B=F 升 / 2k, and B is an integer; 2 Hz≤F 升 ≤4Hz. This setting makes the change of the compressor operating frequency more scientific and further facilitates reducing the energy consumption of the compressor.

[0054] In a specific embodiment of the present invention, preferably F 降 =2Hz, preferably F 升 =2Hz.

[0055] The present invention also provides a readable storage medium, on which computer program instructions are stored. When the computer program instructions are executed, the above-mentioned air-conditioning compressor frequency control method can be implemented.

[0056] The present invention also provides an air conditioning system, including a memory and a processor, wherein the processor is electrically connected to the memory; the processor is configured to execute the above-mentioned air conditioning compressor frequency control method based on instructions stored in the memory.

[0057] It should be noted that the energy-saving control of the air-conditioning system proposed in the present invention is a complex system engineering, involving multiple technologies and methods; the following are some basic steps and principles:

[0058] 1. Data collection: First, the air conditioner in the air conditioning system needs to record the temperature and compressor frequency when it was last used; this data can be obtained through built-in sensors and recording systems;

[0059] 2. Data analysis: The air conditioner then needs to analyze this data to determine the energy efficiency of the last time it was used; for example, if the frequency of the compressor is too high, it may cause excessive energy consumption;

[0060] 3. Temperature adjustment: Based on the results of data analysis, the air conditioner can automatically adjust the temperature for this use; for example, if the air outlet temperature was too high or too low during the last use, the air conditioner can automatically adjust the temperature to reduce energy consumption;

[0061] 4. Compressor frequency adjustment: Similarly, the air conditioner can also adjust the frequency of the current use according to the compressor frequency of the last use; for example, if the compressor frequency of the last use was too high, the air conditioner can automatically reduce the frequency to reduce energy consumption;

[0062] 5. Energy-saving mode: The air conditioner can also automatically switch to energy-saving mode according to the user's needs and habits; for example, if the user often uses the air conditioner at night, the air conditioner can be automatically set to use energy-saving mode at night;

[0063] 6. Intelligent learning: Through repeated use and adjustment, the air conditioner can learn the user's usage habits and preferences and further optimize the energy-saving control strategy;

[0064] 7. User settings: Users can also manually set the temperature and compressor frequency according to their needs to achieve more precise energy-saving control;

[0065] The above are the basic principles and main steps of the air-conditioning system proposed by the present invention, which adjusts the temperature and compressor frequency during current use accordingly according to the temperature and compressor frequency in the previous use record to achieve energy-saving control; of course, the specific implementation method may vary depending on different air conditioner models.

[0066] like Figure 2 As shown, the specific working process and principle of the first embodiment of the present invention are now described in detail as follows:

[0067] The memory function of the air conditioner can record the key operating parameters of the air conditioner in the previous operating cycle, such as the compressor operating frequency F when the set temperature is reached and the compressor stops. 停 (i.e. the rated compressor operating frequency) and the internal ambient temperature T of the machine room 停 (i.e. calibration temperature), if there is no F 停 、T 停 records, the default value F can be used 停 =F 默 , T 停 =T 默 That is, when the operating parameters of the air conditioner when it was shut down last time cannot be obtained or the operating parameters of the air conditioner when it was shut down last time are abnormal and have no reference significance, the calibration temperature and the calibrated compressor operating frequency can be effectively calibrated according to the parameters of the computer room, combined with actual experience and experimental data for reference; and the air conditioner can be set to update the parameters (i.e. re-update the calibration temperature T) when it stops at the set temperature range (i.e. after the normal working process ends). 停 And calibrate the compressor operating frequency F 停 ), the air conditioner will not update parameters when it stops abnormally;

[0068] It is known that the lower limit of the frequency at which the compressor can operate under energy-saving conditions is F 下 (Compressor operating lower limit frequency F 下 ), the upper limit of the operating frequency is F 上The suitable temperature range of the equipment in the computer room is 5~35℃. The higher the temperature, the lower the working performance of the equipment. The lower the temperature, the higher the air conditioning energy consumption.

[0069] like Figure 2 As shown, Figure 2 The representative parameters and various parameters used as the basis for judgment include: calibration temperature T 停 , calibrate the compressor operating frequency F 停 , the collected internal ambient temperature T of the computer room 内 , Energy saving temperature T 节 , the first judgment temperature T k , the second judgment temperature T 余 , the first execution step execution time t0, the compressor start initial working frequency F 初 , compressor operation lower limit frequency F 下 , compressor operation upper limit frequency F 上 , Temperature change rate V 速 , target speed V 标 , the frequency F to which the compressor is to be adjusted 目标 , the current operating frequency of the compressor F 当前 , the compressor needs to reduce the operating frequency F 降 (i.e. the reduction in the compressor operating frequency A) and the compressor operating frequency F that needs to be increased 升 (i.e. the increase in the compressor operating frequency B);

[0070] When the air conditioner is turned on (i.e. the compressor is turned on), the internal ambient temperature T in the machine room is determined. 内 , if the temperature T 内 If the temperature is lower than 35℃, the energy-saving steps can be executed to start the machine; if 0℃≤T 内 -T 停 ≤3℃, the compressor starts with the initial operating frequency F 初 =1 / 2(F 停 +F 下 ), if T 内 -T 停 >3℃, the compressor starts with the initial operating frequency F 初 =F 停 , if T 内 -T 停 <0℃, then F 初 =F 下 ; When the compressor is started with the initial operating frequency F 初 After running for time t0, calculate the temperature change rate V during time t1 速 , V 速 = (T1-T2) / t1, according to the formula V 标 = (T2-T 设 ) / t标 Calculate the target speed V 标 , when V 速 >V 标 When the compressor is running, the operating frequency is reduced to the target frequency F of the compressor. 目标 , F 目标 =F 当前 -F 降 ; When V 标 / 2≤V 速 ≤V 标 When V 速 <V 标 / 2, increase the operating frequency of the compressor at this time, F 目标 =F 当前 +F 升 ;

[0071] If the temperature T 内 If the temperature is greater than or equal to 35℃, the rapid temperature control step can be performed to quickly cool the room. 内 Reduce to 35℃-T 余 After the temperature is within the range, the energy-saving step is executed and the temperature change rate V is compared as above. 速 The compressor frequency is raised and lowered by the logic of the method; in this way, the ambient temperature in the machine room can be lowered to an appropriate temperature before energy saving is achieved, that is, energy saving is achieved while meeting the working environment requirements of the equipment;

[0072] When V 速 >V 标 When the compressor operating frequency decreases, A=kF 降 , and A is an integer; k=V 速 / V 标 , 2 Hz≤F 降 ≤4Hz; when V 速 >V 标 When the temperature change rate V 速 Much greater than the target speed V 标 When the compressor reduces the frequency, the ratio can be used to determine the multiple by which the compressor reduces the frequency;

[0073] When V 速 <V 标 / 2, the increase in the compressor operating frequency is B, B=F 升 / 2k, and B is an integer; 2 Hz≤F 升 ≤4Hz.

[0074] In summary, the present invention provides an air-conditioning compressor frequency control method, a readable storage medium and an air-conditioning system. In actual use, it is found that the operating parameters of the air conditioner when it was last stopped are highly adapted to the actual working conditions of the computer room. Therefore, the present invention realizes effective recording and reference of the operating parameters when the air conditioner was last stopped by setting a calibration recording step, so that the subsequent frequency change of the compressor under control has a reasonable reference correspondence, and there is no need to start the compressor at the highest frequency as in the prior art, thereby effectively reducing the operating frequency of the compressor, reducing energy consumption and achieving energy saving; at the same time, when the operating parameters of the air conditioner when it was last stopped cannot be obtained or the operating parameters of the air conditioner when it was last stopped are abnormal and have no reference significance, the calibration temperature and the calibrated compressor operating frequency can be effectively calibrated for reference according to the parameters of the computer room, combined with actual experience and experimental data; by setting the first execution step, different operating frequencies of the compressor can be determined according to the temperature difference, thereby making the operating frequency of the compressor more in line with the actual use requirements and achieving energy saving of the compressor; in the first execution step The first judgment temperature can be flexibly selected according to factors such as the actual allowable temperature fluctuation range in the computer room, the allowable error range when the air conditioner adjusts the temperature, actual use and experimental experience, etc., so as to realize the flexible setting of the temperature difference criterion, which can further improve the application scope and energy-saving effect of the air-conditioning compressor frequency control method proposed in the present invention; the present invention proposes a compressor frequency control method, which can obtain the reference frequency of the compressor start-up according to the heat load generated by the current computer room and / or the historical operation parameters of the air conditioner, so as to control the compressor of the air conditioner to enter the high-efficiency operation state in advance and realize energy-saving operation; compared with the high-power or full-power compressor starting mode (i.e., high-frequency or maximum frequency starting mode) in the prior art, the method of the present invention controls the operation of the compressor by adopting a low-power compressor frequency, and realizes the low-power operation of the compressor while meeting the temperature drop requirements of the computer room, thereby reducing the overall energy consumption of the air conditioner; the method of the present invention has simple steps and low use cost, can be applied on the basis of the existing variable frequency air conditioner, has obvious energy-saving effect and meets the actual computer room temperature control requirements, and is suitable for large-scale promotion and use.

[0075] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0076] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0077] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0078] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0079] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for controlling the frequency of an air conditioner compressor, characterized in that: The method comprises an energy-saving step, wherein the energy-saving step comprises the following steps: Calibration record steps: According to the operating parameters of the air conditioner when it was last shut down and / or according to the parameters of the machine room, the calibration temperature T is obtained. 停 And calibrate the compressor operating frequency F 停 ; The first execution step: when the air conditioner starts to work, collect the internal environment temperature T in the machine room 内 According to the formula △T=T 内 -T 停 , calculate △T; get the first judgment temperature T according to the setting k , T k is a constant value, and T k >0; When △T>T k When the operating frequency F of the compressor is adjusted 初 =F 停 ; When △T≤T k When adjusting F 初 <F 停 ; The energy-saving step further includes a temperature change speed control step; after the first execution step is executed for t0 time, the temperature change speed control step is executed; The temperature change speed control step includes: collecting the internal environment temperature in the machine room at this time to obtain T1, then waiting for t1 time, and then collecting the internal environment temperature in the machine room to obtain T2, according to the formula V 速 = (T1-T2) / t1, calculate the temperature change rate V 速 ; Get the target speed V according to the setting 标 , V 标 is a fixed value; When V 速 >V 标 When the operating frequency F of the compressor is reduced 初 ; When V 标 / 2≤V 速 ≤V 标 When the operating frequency F of the compressor is maintained at this time 初 constant; When V 速 <V 标 / 2, increase the operating frequency F of the compressor at this time 初 .

2. The air conditioner compressor frequency control method according to claim 1, characterized in that: According to the parameters of the compressor in the air conditioner, the lower limit frequency F of the compressor operation is obtained. 下 , F 下 <F 停 ; In the first execution step: when 0≤△T≤T k When adjusting F 初 =(F 停 +F 下 ) / 2; when △T<0, adjust F 初 =F 下 .

3. The air conditioner compressor frequency control method according to claim 1, characterized in that: In the first execution step: 3°C ≤ T k ≤7℃.

4. The air conditioner compressor frequency control method according to claim 1, characterized in that: The air conditioner compressor frequency control method also includes a temperature determination step and a rapid temperature control step. The temperature determination step includes: setting an energy-saving temperature T according to the parameters of the machine room. 节 , when T 内 <T 节 When T 内 ≥T 节 , the rapid temperature control step is performed; wherein, in the rapid temperature control step, the operating frequency F of the compressor at this time 初 >F 停 As the compressor works, the temperature in the machine room T 内 Gradually decreases, when T 内 <T 节 When the temperature reaches 0.040°, the rapid temperature control step is stopped and the energy saving step is performed.

5. The air conditioner compressor frequency control method according to claim 1, characterized in that: The air conditioner compressor frequency control method also includes a temperature determination step and a rapid temperature control step. The temperature determination step includes: setting an energy-saving temperature T according to the parameters of the machine room. 节 ; According to the setting, the second judgment temperature T is obtained 余 , T 余 is a constant value, and T 余 >0; when T 内 <T 节 -T 余 When T 内 ≥T 节 -T 余 , the rapid temperature control step is performed; wherein, in the rapid temperature control step, the operating frequency F of the compressor at this time 初 >F 停 As the compressor works, the internal ambient temperature T 内 Gradually decreases, when T 内 <T 节 When the temperature reaches 0.040°, the rapid temperature control step is stopped and the energy saving step is performed.

6. The air conditioner compressor frequency control method according to claim 5, characterized in that: 1℃≤T 余 ≤3℃。 7. The air-conditioning compressor frequency control method according to claim 4 or 5, characterized in that: 30℃<T 节 ≤38℃; According to the parameters of the compressor, the upper limit frequency F of the compressor operation is obtained. 上 , F 上 ≥F 停 In the rapid temperature control step, the operating frequency F of the compressor 初 =F 上 .

8. The air conditioner compressor frequency control method according to claim 1, characterized in that: According to the formula V 标 = (T2-T 设 ) / t 标 Calculate the target speed V 标 , T 设 =T 停 +T 差 , T 差 is the set value, 30 min≤t 标 ≤120min; 5 min≤t0≤20min; 1 min≤t1≤3min.

9. The air conditioner compressor frequency control method according to claim 1, characterized in that: When V 速 >V 标 When the compressor operating frequency decreases, A=kF 降 , and A is an integer; k=V 速 / V 标 , 2 Hz≤F 降 ≤4Hz; when V 速 <V 标 / 2, the increase in the compressor operating frequency is B, B=F 升 / 2k, and B is an integer; 2 Hz≤F 升 ≤4Hz.

10. A readable storage medium, characterized in that: The readable storage medium stores computer program instructions, which, when executed, can implement the air-conditioning compressor frequency control method according to any one of claims 1 to 9.

11. An air conditioning system, characterized in that: It includes a memory and a processor, the processor is electrically connected to the memory; the processor is configured to execute the air conditioning compressor frequency control method as described in any one of claims 1 to 9 based on the instructions stored in the memory.

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