Compressor frequency control method and system for air conditioning equipment

Abstract

This invention provides a compressor frequency control method and system for air conditioning equipment. By calculating the target frequency of the compressor based on the greater of humidity requirement, dew point requirement, and temperature difference requirement, when the ambient humidity is very close to the set value, the target frequency of the compressor can be calculated based on the temperature difference requirement. This allows the compressor's operating frequency to be adjusted to the target frequency calculated based on the temperature difference requirement, thus avoiding problems such as insufficient humidity reduction and compressor inability to shut down due to a decrease in compressor frequency. Furthermore, this invention controls the compressor frequency adjustment rate based on the compressor's suction pressure or the evaporation temperature of the refrigerant at the compressor's suction port. By setting different adjustment rates, multiple conditions constrain the compressor frequency adjustment, combining compressor frequency regulation with coil antifreeze protection, maximizing dehumidification effect while increasing the operational stability of the dehumidifier in the computer room.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a compressor frequency control method and system for air conditioning equipment. Background Technology

[0002] To prevent static electricity from damaging electronic components within data centers, strict requirements are placed on temperature and humidity control. To meet energy-saving requirements, data centers often employ high return air operation, utilizing natural cooling or high-temperature chilled water systems to control room temperature. However, these terminal air conditioners lack humidity control capabilities and cannot meet the increasing humidity control demands of data centers. Therefore, data centers require additional dehumidifiers to maintain stable humidity levels within the room.

[0003] Because data centers cannot be completely isolated from outside air, the humidity in the server room environment fluctuates seasonally, and the operating load of the data center fluctuates significantly throughout the day, further leading to fluctuations in the humidity of the server room environment. These changes all require dehumidifiers to have both dehumidification and humidification capabilities.

[0004] Currently, most data center dehumidifiers use fixed-frequency compressors, which have high energy consumption and are gradually deviating from the stringent energy requirements of data centers. Furthermore, fixed-frequency compressors have a limited adjustable cooling capacity range, requiring frequent start-ups and shutdowns, which easily causes humidity fluctuations in the data center, hindering its stable operation. In addition, the data center environment and workload experience periodic and seasonal fluctuations, further affecting the dehumidifier's operating status through ambient temperature and humidity, and even causing evaporator frosting and icing, thus impacting dehumidification efficiency.

[0005] In addition, although some dehumidifiers in computer rooms use inverter compressors, dehumidifiers are different from air-cooled air conditioners. As the ambient humidity gets closer to the set value, the compressor frequency will gradually decrease, the dehumidification effect will be greatly reduced, and the compressor may run continuously and cannot be turned off. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a compressor frequency control method and system for air conditioning equipment to solve the technical problem that when the ambient humidity is extremely close to the set value, the compressor frequency decreases and the dehumidification capacity decreases significantly, resulting in the inability to reduce humidity and the inability to shut down the compressor.

[0007] In a first aspect, embodiments of the present invention provide a compressor frequency control method for an air conditioning device, the air conditioning device including a compressor and a fan, the compressor frequency control method comprising:

[0008] Obtain a first demand, and when the first demand is greater than a first demand setpoint, turn on the fan and the compressor, wherein the first demand is a first humidity demand or a first dew point demand, and the first demand setpoint is a first humidity demand setpoint or a first dew point demand setpoint.

[0009] Obtain the second requirement, and calculate the target frequency of the compressor based on the larger of the first requirement and the second requirement, wherein the second requirement is the temperature difference requirement;

[0010] Adjust the operating frequency of the compressor to the target frequency of the compressor.

[0011] Furthermore, the compressor frequency control also includes:

[0012] Detect the relative humidity of the first environment, and calculate the first humidity requirement based on the relative humidity of the first environment;

[0013] or,

[0014] The first ambient dew point temperature is detected, and the first dew point requirement is calculated based on the first ambient dew point temperature.

[0015] Furthermore, the compressor frequency control also includes:

[0016] Obtain the evaporation temperature of the refrigerant at the compressor suction port;

[0017] The first ambient dew point temperature is detected, and the temperature difference requirement is calculated based on the evaporation temperature and the first ambient dew point temperature.

[0018] Furthermore, the compressor frequency control further includes:

[0019] The suction pressure of the compressor is detected, and the evaporation temperature of the refrigerant at the compressor suction port is calculated based on the suction pressure.

[0020] or,

[0021] The temperature of the evaporator coil connected to the compressor suction port is detected to obtain the evaporation temperature of the refrigerant at the compressor suction port.

[0022] Furthermore, the compressor frequency control method further includes:

[0023] When adjusting the operating frequency of the compressor to the target frequency of the compressor, the adjustment rate of the compressor frequency is also controlled according to the suction pressure of the compressor.

[0024] When the suction pressure is greater than or equal to the first pressure setting value, the compressor frequency is controlled at the first adjustment rate.

[0025] When the suction pressure is greater than or equal to the second pressure setting value and less than the first pressure setting value, the compressor frequency is controlled at the second adjustment rate.

[0026] When the suction pressure is greater than or equal to the third pressure setting value and less than the second pressure setting value, the compressor frequency is controlled to remain unchanged;

[0027] When the suction pressure is less than the third pressure setting value, the compressor frequency is controlled at the third adjustment rate;

[0028] Wherein, the first pressure setting value is greater than the second pressure setting value, the second pressure setting value is greater than the third pressure setting value, the first adjustment rate is greater than the second adjustment rate, the second adjustment rate is greater than the third adjustment rate, and the first adjustment rate and the second adjustment rate are positive numbers, while the third adjustment rate is a negative number.

[0029] Furthermore, the compressor frequency control method further includes:

[0030] When adjusting the operating frequency of the compressor to the target frequency of the compressor, the adjustment rate of the compressor frequency is also controlled according to the evaporation temperature of the refrigerant at the compressor intake port.

[0031] When the evaporation temperature is greater than or equal to the first evaporation temperature set value, the compressor frequency is controlled at the first adjustment rate.

[0032] When the evaporation temperature is greater than or equal to the second evaporation temperature setting value and less than the first evaporation temperature setting value, the compressor frequency is controlled at the second adjustment rate.

[0033] When the evaporation temperature is greater than or equal to the third evaporation temperature setting value and less than the second evaporation temperature setting value, the compressor frequency is controlled to remain unchanged;

[0034] When the evaporation temperature is lower than the third evaporation temperature set value, the compressor frequency is controlled at the third adjustment rate;

[0035] Wherein, the first evaporation temperature setting value is greater than the second evaporation temperature setting value, the second evaporation temperature setting value is greater than the third evaporation temperature setting value, the first adjustment rate is greater than the second adjustment rate, the second adjustment rate is greater than the third adjustment rate, and the first adjustment rate and the second adjustment rate are positive numbers, while the third adjustment rate is a negative number.

[0036] Furthermore, the compressor frequency control method also includes:

[0037] Obtain a third demand, and when the third demand is less than the third demand set point, shut down the fan and the compressor, wherein the third demand is a second humidity demand or a second dew point demand, and the third demand set point is a second humidity demand set point or a second dew point demand set point.

[0038] Alternatively, the compressor frequency control may further include:

[0039] The relative humidity of the second environment is detected, and the second humidity requirement is calculated based on the relative humidity of the second environment; or, the dew point temperature of the second environment is detected, and the second dew point requirement is calculated based on the dew point temperature of the second environment; and the second humidity requirement setpoint is lower than the first humidity requirement setpoint, and the second dew point requirement setpoint is lower than the first dew point requirement setpoint.

[0040] In a second aspect, embodiments of the present invention provide a compressor frequency control system for an air conditioning device, the system including a main controller connected to the compressor and a fan, the main controller including:

[0041] The acquisition module is used to acquire the first requirement and the second requirement;

[0042] The first control module is used to control the opening and closing of the compressor and the fan;

[0043] The second control module is used to calculate the target frequency of the compressor based on the greater of the first requirement and the second requirement, and to adjust the operating frequency of the compressor to the target frequency.

[0044] Thirdly, embodiments of the present invention provide an electronic device, including a memory and a processor, wherein the memory stores a computer program that can run on the processor, and the processor executes the computer program to implement the compressor frequency control method of the air conditioning device as described above.

[0045] Fourthly, embodiments of the present invention provide a computer-readable medium having processor-executable non-volatile program code, the program code causing the processor to execute the compressor frequency control method of the air conditioning device as described above.

[0046] This invention provides a compressor frequency control method and system for air conditioning equipment. By calculating the target frequency of the compressor based on the greater of humidity requirement, dew point requirement, and temperature difference requirement, when the ambient humidity is very close to the set value, the target frequency of the compressor can be calculated based on the temperature difference requirement. This allows the compressor's operating frequency to be adjusted to the target frequency calculated based on the temperature difference requirement, thus avoiding problems such as insufficient humidity reduction and compressor inability to shut down due to a decrease in compressor frequency and dehumidification capacity. Furthermore, this invention controls the compressor frequency adjustment rate based on the compressor's suction pressure or the evaporation temperature of the refrigerant at the compressor's suction port. By setting different adjustment rates, multiple conditions constrain the compressor frequency adjustment, combining compressor frequency regulation with coil antifreeze protection, maximizing dehumidification effect while increasing the operational stability of the dehumidifier in the computer room.

[0047] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0048] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0049] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0050] Figure 1 This is a flowchart of a compressor frequency control method for an air conditioning device provided in Embodiment 1 of the present invention;

[0051] Figure 2 This is a schematic diagram of the compressor frequency control system of the air conditioning equipment provided in Embodiment 1 of the present invention;

[0052] Figure 3 This is a schematic diagram of the compressor frequency control system of another air conditioning device provided in Embodiment 2 of the present invention;

[0053] Figure 4 This is a schematic diagram of the compressor frequency control system of an air conditioning device provided in Embodiment 2 of the present invention.

[0054] icon:

[0055] 1-Fan; 2-Condenser; 3-High-pressure sensor; 4-Inlet valve; 5-Water tank; 6-Drain valve; 7-Exhaust temperature sensor; 8-Compressor; 9-Electronic expansion valve; 10-Low-pressure sensor; 11-Suction temperature sensor; 12-Liquid level sensor; 13-Water pump; 14-Wet film; 15-Evaporator; 16-Ambient temperature and humidity sensor; 17-Wet film distributor; 18-Main controller; 19-Coil temperature sensor. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] To facilitate understanding of this embodiment, the embodiments of the present invention will be described in detail below.

[0058] Example 1:

[0059] Figure 1 This is a flowchart of the frequency control method for an air conditioner compressor provided in Embodiment 1 of the present invention.

[0060] Reference Figure 1 The air conditioning equipment includes a compressor and a fan. The compressor frequency control method includes the following steps:

[0061] Step S101: Obtain the first demand. When the first demand is greater than the first demand set point, turn on the fan and compressor. Here, the first demand is the first humidity demand or the first dew point demand, and the first demand set point is the first humidity demand set point or the first dew point demand set point.

[0062] Step S102: Obtain the second requirement, and calculate the target frequency of the compressor based on the larger of the first requirement and the second requirement, wherein the second requirement is the temperature difference requirement.

[0063] Step S103: Adjust the compressor's operating frequency to the compressor's target frequency.

[0064] Furthermore, compressor frequency control also includes the following steps:

[0065] Step S201: Detect the relative humidity of the first environment and calculate the first humidity requirement based on the relative humidity of the first environment;

[0066] or,

[0067] Step S202: Detect the first ambient dew point temperature and calculate the first dew point requirement based on the first ambient dew point temperature.

[0068] Specifically, the first ambient relative humidity d1 is detected, and the first humidity requirement Rd1 is calculated, where Rd1 = (first ambient relative humidity - target relative humidity) / unit control accuracy. The target relative humidity is a set value based on the unit control target, specifically set according to experience or actual application requirements. The unit control accuracy is the control accuracy based on relative humidity, also set according to actual application requirements, and is not limited here. The calculated first humidity requirement Rd1 is compared with the first humidity requirement setpoint SPd1 to determine whether the unit needs to enter dehumidification mode. The first humidity requirement setpoint SPd1 is also set according to actual application requirements. If the first humidity requirement is greater than the first humidity requirement setpoint, the fan and compressor are turned on; if the first humidity requirement is less than the first humidity requirement setpoint, the compressor frequency regulation logic is exited.

[0069] This application determines whether the unit has entered the dehumidification state by detecting either the relative humidity of the first environment or the dew point temperature of the first environment, in order to meet the needs of different scenarios for controlling the dew point temperature. Similarly, when detecting the dew point temperature of the first environment, the first environmental dew point temperature Td1 is detected, and the first humidity requirement Rtd1 is calculated, where Rtd1 = (first environmental dew point temperature - target dew point temperature) / unit control accuracy, where the unit control accuracy is the control accuracy based on the dew point temperature.

[0070] Furthermore, compressor frequency control also includes the following steps:

[0071] Step S301: Obtain the evaporation temperature of the refrigerant at the compressor suction port;

[0072] Step S302: Detect the first ambient dew point temperature, and calculate the temperature difference requirement based on the evaporation temperature and the first ambient dew point temperature.

[0073] Specifically, after calculating the temperature difference requirement, when the first humidity requirement is greater than the temperature difference requirement, the target frequency of the compressor is calculated based on the first humidity requirement; when the temperature difference requirement is greater than the first humidity requirement, the target frequency of the compressor is calculated based on the temperature difference requirement.

[0074] or,

[0075] When the first dew point requirement is greater than the temperature difference requirement, the target frequency of the compressor is calculated based on the first dew point requirement; when the temperature difference requirement is greater than the first dew point requirement, the target frequency of the compressor is calculated based on the temperature difference requirement.

[0076] Wherein, the compressor's target frequency = (current demand - minimum frequency demand) / (maximum frequency demand - minimum frequency demand) * (maximum frequency - minimum frequency) + minimum frequency, where minimum frequency ≤ target frequency ≤ maximum frequency, and frequencies exceeding the boundary are executed according to the boundary frequency. Current demand refers to the humidity demand, dew point demand, or temperature difference demand detected by the compressor during its current operation; minimum frequency demand refers to the humidity demand, dew point demand, or temperature difference demand corresponding to the compressor operating at its lowest frequency; maximum frequency demand refers to the humidity demand, dew point demand, or temperature difference demand corresponding to the compressor operating at its highest frequency; maximum frequency and minimum frequency refer to the highest and lowest operating frequencies set for the compressor.

[0077] Furthermore, compressor frequency control further includes the following steps:

[0078] Step S401: Detect the compressor's suction pressure and calculate the evaporation temperature of the refrigerant at the compressor's suction port based on the suction pressure;

[0079] or,

[0080] Step S402: Detect the temperature of the evaporator coil connected to the compressor suction port to obtain the evaporation temperature of the refrigerant at the compressor suction port.

[0081] Specifically, the evaporation temperature of the refrigerant at the compressor suction port can be obtained in two ways. The first method is to first detect the compressor suction pressure and then calculate the evaporation temperature of the refrigerant at the compressor suction port based on the suction pressure. That is, the suction pressure PL is detected by the low-pressure sensor 10, and then the refrigerant saturation temperature Te1 (evaporation temperature) at the corresponding pressure is calculated.

[0082] The temperature difference requirement Rt is calculated based on the evaporation temperature Te1 and the first ambient dew point temperature Td1, i.e., Rt = (first ambient dew point temperature - evaporation temperature) / unit control accuracy. Then, the temperature difference requirement is compared with the humidity requirement. The unit control accuracy is the control accuracy based on the dew point temperature.

[0083] The second method is to directly detect the temperature of the evaporator coil connected to the compressor's suction port. The temperature of the evaporator coil is the evaporation temperature of the refrigerant at the compressor's suction port.

[0084] Furthermore, the compressor frequency control method further includes the following steps:

[0085] Step S501: When adjusting the operating frequency of the compressor to the target frequency of the compressor, the adjustment rate of the compressor frequency is also controlled according to the suction pressure of the compressor.

[0086] When the suction pressure is greater than or equal to the first pressure setting value, the compressor frequency is controlled at the first adjustment rate.

[0087] When the suction pressure is greater than or equal to the second pressure set value and less than the first pressure set value, control the compressor frequency at the second adjustment rate;

[0088] When the suction pressure is greater than or equal to the third pressure set value and less than the second pressure set value, keep the compressor frequency unchanged;

[0089] When the suction pressure is less than the third pressure set value, control the compressor frequency at the third adjustment rate;

[0090] Among them, the first pressure set value is greater than the second pressure set value, the second pressure set value is greater than the third pressure set value, the first adjustment rate is greater than the second adjustment rate, the second adjustment rate is greater than the third adjustment rate, and the first adjustment rate and the second adjustment rate are positive numbers, and the third adjustment rate is a negative number.

[0091] Specifically, following the principle of enabling the compressor to smoothly rise to the target operating frequency in the shortest time, it is necessary to allow the compressor to rise in frequency relatively quickly when the low-pressure is higher than a certain value under the condition that the unit conditions permit (due to the certain hysteresis of the refrigeration system itself, the suction pressure fluctuations caused by the compressor frequency conversion will continue for a short time, and too low suction pressure will cause the coil to freeze). That is, when the suction pressure PL> the first pressure set value SPL1, give the compressor a higher frequency rise rate, that is, the first adjustment rate V1.

[0092] Due to the hysteresis of the system, when the low-pressure is close to the freezing point, it is necessary to reduce the compressor frequency rise rate and rise in frequency slowly. That is, when the second pressure set value SPL2< the suction pressure PL< the first pressure set value SPL1, the first adjustment rate V1 drops to the second adjustment rate V2.

[0093] If the compressor maintains the second adjustment rate V2 to rise in frequency at this time, and the low-pressure is still decreasing (PL<SPL2), the risk of the coil icing caused by the continuous rise in the compressor frequency is too high. Considering the principle of maximizing the dehumidification capacity, the compressor frequency rise will be paused, and the existing frequency of the compressor will be maintained. According to the change of the low-pressure in the subsequent period of time, the compressor frequency will be adjusted again.

[0094] If the low-pressure is still decreasing when the compressor maintains the current frequency, that is, the suction pressure PL< the third pressure set value SPL3, it proves that the current compressor frequency is too high and the compressor frequency needs to be reduced. Considering the maximization of the dehumidification capacity and the system hysteresis, the compressor needs to be reduced in frequency slowly, that is, to reduce the frequency at the third adjustment rate V3 until the low-pressure rises back to the safe value. Further, the compressor frequency control method further includes the following steps:

[0095] Step S601: When adjusting the operating frequency of the compressor to the target frequency of the compressor, the adjustment rate of the compressor frequency is also controlled according to the evaporation temperature of the refrigerant at the compressor suction port.

[0096] Here, refer to Figure 3 A coil temperature sensor 19 is added to directly detect the evaporation temperature Te2, and the compressor frequency regulation rate is determined based on the evaporation temperature Te2.

[0097] When the evaporation temperature is greater than or equal to the first evaporation temperature set value, the compressor frequency is controlled at the first adjustment rate.

[0098] When the evaporation temperature is greater than or equal to the second evaporation temperature setting value and less than the first evaporation temperature setting value, the compressor frequency is controlled at the second adjustment rate.

[0099] When the evaporation temperature is greater than or equal to the third evaporation temperature setting value and less than the second evaporation temperature setting value, the compressor frequency is kept constant.

[0100] When the evaporation temperature is lower than the third evaporation temperature setting value, the compressor frequency is controlled at the third adjustment rate;

[0101] Among them, the first evaporation temperature setting is greater than the second evaporation temperature setting, the second evaporation temperature setting is greater than the third evaporation temperature setting, the first adjustment rate is greater than the second adjustment rate, the second adjustment rate is greater than the third adjustment rate, and the first and second adjustment rates are positive numbers, while the third adjustment rate is negative.

[0102] Furthermore, the compressor frequency control method also includes the following steps:

[0103] Step S701: Obtain the third demand. When the third demand is less than the third demand setpoint, turn off the fan and compressor. The third demand is the second humidity demand or the second dew point demand, and the third demand setpoint is the second humidity demand setpoint or the second dew point demand setpoint.

[0104] Alternatively, compressor frequency control may also include the following steps:

[0105] Step S702: Detect the relative humidity of the second environment and calculate the second humidity requirement based on the relative humidity of the second environment; or, detect the dew point temperature of the second environment and calculate the second dew point requirement based on the dew point temperature of the second environment; and the second humidity requirement setpoint is lower than the first humidity requirement setpoint, and the second dew point requirement setpoint is lower than the first dew point requirement setpoint.

[0106] Specifically, after step S103, the second ambient relative humidity d2 is detected by the ambient temperature and humidity sensor 16, and the second humidity requirement Rd2 is calculated; if Rd2 is less than the second humidity requirement setpoint SPd2, the process exits; wherein the second humidity requirement setpoint SPd2 < the first humidity requirement setpoint SPd1, the second humidity requirement setpoint SPd2 < the first humidity requirement setpoint SPd1 is set to avoid frequent system start-stop, in which case the dehumidification exit requirement will be less than the start requirement.

[0107] or,

[0108] After step S103, the second ambient dew point temperature Td2 is detected, and the second dew point requirement Rtd2 is calculated based on the second ambient dew point temperature Td2; if Rtd2 is less than the second dew point requirement set point SPtd2, then exit; wherein, the second dew point requirement set point SPtd2 is less than the first dew point requirement set point SPtd1.

[0109] Reference Figure 2 The air conditioning equipment may be a dehumidifier, which includes a fan 1, a condenser 2, a high-pressure sensor 3, a water inlet valve 4, a water tank 5, a drain valve 6, an exhaust temperature sensor 7, a compressor 8, an electronic expansion valve 9, a low-pressure sensor 10, an intake temperature sensor 11, a liquid level sensor 12, a water pump 13, a wet film 14, an evaporator 15, an ambient temperature and humidity sensor 16, a wet film water distributor 17, and a main controller 18. The system detects the relative humidity of the environment through an ambient temperature and humidity sensor 16, the intake pressure through a low-pressure sensor 10, and the ambient dew point temperature through the ambient temperature and humidity sensor 16. During humidification, the compressor does not run, and the water pump 13 draws water from the water tank 5 to the wet film distributor 17. The wet film distributor 17 distributes water to the wet film 14, and the fan 1 is started. The air is humidified after passing through the wet film 14 and is then sent to the target environment through the fan 1. During dehumidification, the water pump does not run, but the compressor and the fan run. The air is dehumidified and cooled after passing through the evaporator 15 and is heated after passing through the condenser 2 to achieve constant temperature dehumidification. If cooling dehumidification is required, the air only needs to be prevented from passing through the condenser 2.

[0110] This application allows for multi-condition constraint on compressor frequency adjustment, combining compressor frequency regulation with coil anti-freeze protection to maximize dehumidification effect while improving the operational stability of the computer room dehumidifier. It can flexibly adjust the compressor frequency according to actual operating conditions, preventing a significant reduction in dehumidification capacity due to the compressor frequency decreasing when the ambient humidity is extremely close to the set value, thus avoiding the inability to reduce humidity or shut down the compressor.

[0111] Example 2:

[0112] Figure 3 and Figure 4This is a schematic diagram of the compressor frequency control system of an air conditioning device provided in Embodiment 2 of the present invention.

[0113] Reference Figure 4 The system includes a main controller 18 connected to the compressor 8 and the fan 1. The main controller 18 includes:

[0114] The acquisition module is used to acquire the first and second requirements.

[0115] The first control module is used to control the opening and closing of the compressor and fan;

[0116] The second control module is used to calculate the target frequency of the compressor based on the larger of the first and second requirements, and adjust the operating frequency of the compressor to the target frequency.

[0117] This invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the compressor frequency control method for the air conditioning device provided in the above embodiments.

[0118] This invention also provides a computer-readable medium having processor-executable non-volatile program code, on which a computer program is stored, and which, when run by a processor, executes the steps of the compressor frequency control method of the air conditioning device described above.

[0119] The computer program product provided in this embodiment of the invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the methods described in the preceding method embodiments. For specific implementation details, please refer to the method embodiments, which will not be repeated here.

[0120] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and apparatus described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0121] Furthermore, in the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0122] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0123] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0124] Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0125] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A compressor frequency control method for an air conditioning device, characterized in that, The air conditioning equipment includes a compressor and a fan, and the compressor frequency control method includes: Obtain a first demand, and when the first demand is greater than a first demand setpoint, turn on the fan and the compressor, wherein the first demand is a first humidity demand or a first dew point demand, and the first demand setpoint is a first humidity demand setpoint or a first dew point demand setpoint. Obtain the second requirement, and calculate the target frequency of the compressor based on the larger of the first requirement and the second requirement, wherein the second requirement is the temperature difference requirement; Adjust the operating frequency of the compressor to the target frequency of the compressor; The compressor frequency control also includes: Obtain the evaporation temperature of the refrigerant at the compressor suction port; The first ambient dew point temperature is detected, and the temperature difference requirement is calculated based on the evaporation temperature and the first ambient dew point temperature.

2. The compressor frequency control method according to claim 1, characterized in that, The compressor frequency control also includes: Detect the relative humidity of the first environment, and calculate the first humidity requirement based on the relative humidity of the first environment; or, The first ambient dew point temperature is detected, and the first dew point requirement is calculated based on the first ambient dew point temperature.

3. The compressor frequency control method according to claim 1, characterized in that, The compressor frequency control further includes: The suction pressure of the compressor is detected, and the evaporation temperature of the refrigerant at the compressor suction port is calculated based on the suction pressure. or, The temperature of the evaporator coil connected to the compressor suction port is detected to obtain the evaporation temperature of the refrigerant at the compressor suction port.

4. The compressor frequency control method according to claim 1, characterized in that, The compressor frequency control method further includes: When adjusting the operating frequency of the compressor to the target frequency of the compressor, the adjustment rate of the compressor frequency is also controlled according to the suction pressure of the compressor. When the suction pressure is greater than or equal to the first pressure setting value, the compressor frequency is controlled at the first adjustment rate. When the suction pressure is greater than or equal to the second pressure setting value and less than the first pressure setting value, the compressor frequency is controlled at the second adjustment rate. When the suction pressure is greater than or equal to the third pressure setting value and less than the second pressure setting value, the compressor frequency is controlled to remain unchanged; When the suction pressure is less than the third pressure setting value, the compressor frequency is controlled at the third adjustment rate; Wherein, the first pressure setting value is greater than the second pressure setting value, the second pressure setting value is greater than the third pressure setting value, the first adjustment rate is greater than the second adjustment rate, the second adjustment rate is greater than the third adjustment rate, and the first adjustment rate and the second adjustment rate are positive numbers, while the third adjustment rate is a negative number.

5. The compressor frequency control method according to claim 1, characterized in that, The compressor frequency control method further includes: When adjusting the operating frequency of the compressor to the target frequency of the compressor, the adjustment rate of the compressor frequency is also controlled according to the evaporation temperature of the refrigerant at the compressor intake port. When the evaporation temperature is greater than or equal to the first evaporation temperature set value, the compressor frequency is controlled at the first adjustment rate. When the evaporation temperature is greater than or equal to the second evaporation temperature setting value and less than the first evaporation temperature setting value, the compressor frequency is controlled at the second adjustment rate. When the evaporation temperature is greater than or equal to the third evaporation temperature setting value and less than the second evaporation temperature setting value, the compressor frequency is controlled to remain unchanged; When the evaporation temperature is lower than the third evaporation temperature set value, the compressor frequency is controlled at the third adjustment rate; Wherein, the first evaporation temperature setting value is greater than the second evaporation temperature setting value, the second evaporation temperature setting value is greater than the third evaporation temperature setting value, the first adjustment rate is greater than the second adjustment rate, the second adjustment rate is greater than the third adjustment rate, and the first adjustment rate and the second adjustment rate are positive numbers, while the third adjustment rate is a negative number.

6. The compressor frequency control method according to claim 4 or 5, characterized in that, The compressor frequency control method further includes: Obtain a third demand, and when the third demand is less than the third demand set point, shut down the fan and the compressor, wherein the third demand is a second humidity demand or a second dew point demand, and the third demand set point is a second humidity demand set point or a second dew point demand set point. Alternatively, the compressor frequency control may further include: The relative humidity of the second environment is detected, and the second humidity requirement is calculated based on the relative humidity of the second environment; or, the dew point temperature of the second environment is detected, and the second dew point requirement is calculated based on the dew point temperature of the second environment; and the second humidity requirement setpoint is lower than the first humidity requirement setpoint, and the second dew point requirement setpoint is lower than the first dew point requirement setpoint.

7. A compressor frequency control system for an air conditioning device, characterized in that, The compressor frequency control method according to any one of claims 1 to 6, the system comprising a main controller connected to the compressor and the fan, the main controller comprising: The acquisition module is used to acquire the first and second requirements. The first control module is used to control the opening and closing of the compressor and the fan; The second control module is used to calculate the target frequency of the compressor based on the greater of the first requirement and the second requirement, and to adjust the operating frequency of the compressor to the target frequency.

8. An electronic device comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, characterized in that, When the processor executes the computer program, it implements the compressor frequency control method of the air conditioning equipment according to any one of claims 1 to 6.

9. A computer-readable medium having processor-executable non-volatile program code, characterized in that, The program code causes the processor to execute the compressor frequency control method of the air conditioning equipment according to any one of claims 1 to 6.

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