CN115682313A

CN115682313A - Multi-split air conditioning system and control method thereof

Info

Publication number: CN115682313A
Application number: CN202211400458.7A
Authority: CN
Inventors: 王战术
Original assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Current assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2023-02-03

Abstract

The application provides a multi-split air conditioning system and a control method thereof, relates to the technical field of air conditioners, and is used for controlling the multi-split air conditioning system to operate in a high sensible heat mode so as to reduce energy consumption. This multi-split air conditioning system includes: an outdoor unit; at least one indoor unit; at least one first temperature sensor; at least one humidity sensor; a controller configured to: the method comprises the steps that the return air temperature of each indoor unit is obtained through at least one first temperature sensor, and the environmental humidity of each indoor unit is obtained through at least one humidity sensor; respectively determining the return air temperature difference and the humidity difference of each indoor unit; and if the maximum return air temperature difference in the at least one indoor unit is smaller than the temperature threshold value and the maximum humidity difference value in the at least one indoor unit is smaller than the humidity threshold value, the outdoor unit is controlled to operate in a high sensible heat mode, wherein the sensible heat ratio of the multi-split air conditioning system in the high sensible heat mode is higher than that in other operation modes.

Description

Multi-split air conditioning system and control method thereof

Technical Field

The application relates to the technical field of air conditioners, in particular to a multi-split air conditioner system and a control method thereof.

Background

At present, the multi-split air conditioner is widely applied to the aspects of commerce, home furnishing and the like. Compared with the common air conditioning system, the multi-split air conditioner has the advantages of energy conservation, low operation cost, advanced control, reliable operation, good unit adaptability and wide refrigerating and heating temperature range.

The existing multi-split air conditioning system usually controls the heat-humidity ratio in a heat-humidity unified treatment mode, refrigeration and dehumidification share a low-temperature cold source, and energy cannot be fully utilized, so that the energy consumption of the air conditioning system is high.

Disclosure of Invention

The application provides a multi-split air conditioning system and a control method thereof, which are used for controlling the multi-split air conditioning system to operate in a high sensible heat mode so as to reduce energy consumption.

In order to achieve the purpose, the following technical scheme is adopted in the application.

In a first aspect, an embodiment of the present application provides a multi-split air conditioning system and a control method thereof, and relates to the technical field of air conditioners. This multi-split air conditioning system includes: an outdoor unit; each indoor unit in the at least one indoor unit is respectively connected with the outdoor unit through a refrigerant connecting pipeline; the first temperature sensor is used for detecting the return air temperature of each indoor unit; at least one humidity sensor for detecting the ambient humidity of each indoor unit; a controller configured to: the method comprises the steps that return air temperature of each indoor unit is obtained through at least one first temperature sensor, and the environment humidity of each indoor unit is obtained through at least one humidity sensor; respectively determining the return air temperature difference and the humidity difference value of each indoor unit, wherein for one of the indoor units, the return air temperature difference is the difference value between the return air temperature of the indoor unit and the set temperature of the indoor unit, and the humidity difference value is the difference value between the environment humidity of the indoor unit and the set humidity of the indoor unit; and if the maximum return air temperature difference in the at least one indoor unit is smaller than a temperature threshold value and the maximum humidity difference value in the at least one indoor unit is smaller than a humidity threshold value, the outdoor unit is controlled to operate in a high sensible heat mode, wherein the sensible heat ratio of the multi-split air conditioning system in the high sensible heat mode is higher than that in other operation modes.

The technical scheme provided by the embodiment of the application at least has the following beneficial effects: the scheme provides an operation mode of the multi-split air-conditioning system, namely a high sensible heat mode, and the sensible heat ratio of the multi-split air-conditioning system in the high sensible heat mode is higher than that of other modes. In addition, the method and the device determine whether the judgment condition of the high-heat-development mode is met, namely the set temperature threshold and the set humidity threshold according to the actual temperature and the actual humidity. When the judgment condition of the operation high-heat-development mode is met, the indoor temperature and humidity are appropriate, so that the operation high-heat-development mode can be controlled, the energy consumed by adjusting the indoor temperature and humidity is reduced, and the purpose of reducing energy consumption is achieved.

In some embodiments, the controller is further configured to: and if the maximum return air temperature difference is larger than or equal to the temperature threshold value and/or the maximum humidity difference value is larger than or equal to the humidity threshold value, controlling the air conditioner outdoor unit to finish the operation of the high-heat-development mode.

In some embodiments, the controller is specifically configured to: determining a target grade parameter of a high sensible heat mode according to the maximum return air temperature difference; and controlling the outdoor unit to operate at a target high sensible heat level corresponding to the target level parameter according to a preset corresponding relationship and the level parameter, wherein the preset corresponding relationship is used for indicating the corresponding relationship between at least one level parameter and at least one high sensible heat level.

In some embodiments, the controller is further configured to: determining an evaporation temperature correction value according to the maximum return air temperature difference and a target return air temperature difference value corresponding to the target high sensible heat level; determining a target evaporation temperature according to a preset evaporation temperature and an evaporation temperature correction value when the multi-split air conditioning system operates; and adjusting the operating frequency of a compressor of the multi-split air conditioning system according to the target evaporation temperature.

In some embodiments, the controller is specifically configured to: if the actual evaporation temperature is higher than the target evaporation temperature, increasing the running frequency of the compressor; if the actual evaporation temperature is equal to the target evaporation temperature, controlling the running frequency of the compressor to be kept unchanged; and if the actual evaporation temperature is less than the target evaporation temperature, reducing the running frequency of the compressor.

In some embodiments, the controller is specifically controlled to: and determining a difference value between the target return air temperature difference value and the maximum return air temperature difference value, and determining an evaporation temperature correction value according to the difference value between the target return air temperature difference value and the maximum return air temperature difference value.

In some embodiments, the controller is further configured to: and adjusting the operating frequency of a compressor of the multi-split air conditioning system according to the target air outlet temperature corresponding to the target high sensible heat level.

In some embodiments, the controller is specifically controlled to: the actual air outlet temperature of the indoor unit corresponding to the maximum air return temperature value is detected through a third temperature sensor; if the actual air outlet temperature is lower than the target air outlet temperature, reducing the operating frequency of the compressor; and if the actual air outlet temperature is greater than or equal to the target air outlet temperature, controlling the running frequency of the compressor to keep unchanged.

In a second aspect, an embodiment of the present application provides a method for controlling a multi-split air conditioning system, including: the method comprises the steps that return air temperature of each indoor unit is obtained through at least one first temperature sensor, and the environment humidity of each indoor unit is obtained through at least one humidity sensor; respectively determining the return air temperature difference and the humidity difference value of each indoor unit, wherein for one indoor unit, the return air temperature difference is the difference value between the return air temperature of the indoor unit and the set temperature of the indoor unit, and the humidity difference value is the difference value between the environmental humidity of the indoor unit and the set humidity of the indoor unit; and if the maximum return air temperature difference in the at least one indoor unit is smaller than the temperature threshold value and the maximum humidity difference value in the at least one indoor unit is smaller than the humidity threshold value, the outdoor unit is controlled to operate in a high sensible heat mode, wherein the sensible heat ratio of the multi-split air conditioning system in the high sensible heat mode is higher than that in other operation modes.

In a third aspect, an embodiment of the present application provides a controller, including: one or more processors; one or more memories; wherein the one or more memories are configured to store computer program code comprising computer instructions, and the controller executes any one of the control methods of the multi-split air conditioning system provided by the second aspect when the one or more processors execute the computer instructions.

In a fourth aspect, embodiments of the present application provide a computer-readable storage medium including computer instructions that, when executed on a computer, cause the computer to perform any one of the control methods of the multi-split air conditioning system provided in the second aspect.

In a fifth aspect, embodiments of the present invention provide a computer program product, which is directly loadable into a memory and contains software codes, and which, when loaded and executed by a computer, is capable of implementing any of the methods for controlling a multi-split air conditioning system as provided in the second aspect.

It should be noted that all or part of the computer instructions may be stored on the computer readable storage medium. The computer readable storage medium may be packaged with or separately from a processor of the controller, which is not limited in this application.

For a detailed description of the second to fifth aspects and their respective embodiments in this application, reference may be made to the detailed description of the first aspect and its respective embodiments; moreover, the beneficial effects of the second aspect to the fifth aspect and the various implementation manners thereof may refer to the beneficial effect analysis of the first aspect and the various embodiments thereof, and are not described herein again.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

Fig. 1 is a schematic composition diagram of a multi-split air conditioning system according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a multi-split air conditioning system according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of an outdoor unit according to an embodiment of the present application;

fig. 4 is a block diagram illustrating a hardware configuration of a multi-split air conditioning system according to an embodiment of the present disclosure;

fig. 5 is a flowchart illustrating a method for controlling a multi-split air conditioning system according to an embodiment of the present disclosure;

fig. 6 is a flowchart of a control method for another multi-split air conditioning system according to an embodiment of the present disclosure;

fig. 7 is a block diagram illustrating a hardware configuration of a controller of a multi-split air conditioning system according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that all directional indicators (such as up, down, left, right, front, and back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it should be noted that the terms "connected" and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection unless otherwise explicitly stated or limited. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art. In addition, when a pipeline is described, the terms "connected" and "connected" are used in this application to have a meaning of conducting. The specific meaning is to be understood in conjunction with the context.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

For the convenience of understanding, a brief introduction and description will be made to some basic concepts of terms or techniques related to the embodiments of the present invention.

A refrigeration mode: the compressor of the air conditioning system sucks the low-temperature and low-pressure gaseous refrigerant evaporated by the evaporator into a compressor cavity, compresses the low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant, and enters the condenser. The high-temperature high-pressure gas refrigerant is condensed into a high-temperature high-pressure liquid refrigerant in the condenser, then is throttled by a throttling element such as a capillary tube, is changed into a low-temperature low-pressure liquid refrigerant, enters the evaporator for evaporation, and finally returns to the compressor, so that the whole refrigeration cycle is completed. The outdoor heat exchanger in the cooling mode is used as a condenser, and the indoor heat exchanger is used as an evaporator.

Refrigerant: a substance which is easily changed into gas by heat absorption and liquid by heat release. In an air conditioning system, heat energy is transferred by evaporation and condensation of a refrigerant, resulting in a refrigeration effect.

A dehumidification mode: the heat exchanger of the indoor unit of the air conditioning system is used as an evaporator to absorb heat, indoor air is condensed into water through the evaporator to be reserved in the air conditioner, and then the water vapor is discharged through a water discharge pipe of the air conditioner, so that the effect of drying the indoor air is achieved.

Apparent heat ratio: sensible heat ratio is the ratio of sensible load to total load. The total load of the air conditioning system during operation consists of an apparent load and a latent load, wherein the apparent load refers to the energy consumed by the air conditioning system in unit time for reducing indoor temperature, and the latent load refers to the energy consumed by the air conditioning system in unit time for reducing indoor humidity. The larger the sensible heat ratio is, the more obvious the refrigerating effect is, and the higher the working efficiency of the air conditioning system is.

In the related technology, the refrigeration and dehumidification of the multi-split air conditioning system are realized by cooling, condensing and dehumidifying air through a surface cooler, and because the air conditioning system adopts a temperature and humidity unified processing method, the energy consumption is high, and meanwhile, the temperature and humidity unified processing method is difficult to adapt to the change of a heat-humidity ratio, so that the indoor air quality is low, and the comfort of a user is not high. The air conditioning system adopting the independent temperature and humidity control system solves the problem of controlling two parameters of temperature and humidity by adopting two processing means respectively, needs a large amount of water resources and huge supporting facilities, and has higher investment and operation cost.

Based on this, the embodiment of the application provides a multi-split air conditioning system. The system comprises: an outdoor unit; each indoor unit in the at least one indoor unit is respectively connected with the outdoor unit through a refrigerant connecting pipeline; the first temperature sensor is used for detecting the return air temperature of each indoor unit; at least one humidity sensor for detecting the ambient humidity of each indoor unit; a controller configured to: the method comprises the steps that return air temperature of each indoor unit is obtained through at least one first temperature sensor, and the environment humidity of each indoor unit is obtained through at least one humidity sensor; respectively determining the return air temperature difference and the humidity difference value of each indoor unit, wherein for one of the indoor units, the return air temperature difference is the difference value between the return air temperature of the indoor unit and the set temperature of the indoor unit, and the humidity difference value is the difference value between the environment humidity of the indoor unit and the set humidity of the indoor unit; and if the maximum return air temperature difference in the at least one indoor unit is smaller than the temperature threshold value and the maximum humidity difference value in the at least one indoor unit is smaller than the humidity threshold value, the outdoor unit is controlled to operate in a high sensible heat mode, wherein the sensible heat ratio of the multi-split air conditioning system in the high sensible heat mode is higher than that in other operation modes. Through the multi-split air conditioning system, high sensible heat refrigeration is realized, so that the frequency of the compressor is reduced, and the purpose of reducing energy consumption is achieved.

The embodiments provided in the present application will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram illustrating a composition of a multi-split air conditioning system provided in an exemplary embodiment of the present disclosure, and fig. 2 is a schematic diagram illustrating internal components of a multi-split air conditioning system provided in an exemplary embodiment of the present disclosure. The multi-split air conditioning system provided by the embodiment of the present application is described below with reference to fig. 1 and 2.

The multi-split air conditioning system 100 includes an outdoor unit 11, an indoor unit 12, an indoor unit 13, and a controller 14 (not shown in fig. 1). Each indoor unit in at least one indoor unit is respectively connected with the outdoor unit through a refrigerant connecting pipeline.

In fig. 1, only one outdoor unit is connected to two indoor units, and the present application provides a multi-split air conditioning system in which one outdoor unit is connected to a plurality of indoor units, and the composition of the multi-split air conditioning system in fig. 1 does not constitute a limitation on the multi-split air conditioning system.

The outdoor unit 11 is generally installed outdoors and used for heat exchange in an indoor environment. In the illustration of fig. 1, the outdoor unit 11 is indicated by a broken line because the outdoor unit 11 is located outdoors on the opposite side of the

indoor units

12 and 13 with respect to the wall surface.

The outdoor unit includes: a compressor 111, an outdoor heat exchanger 112, an outdoor fan 113, an outdoor expansion valve 114, a four-way selector valve 115, a liquid-side shutoff valve 116, and a gas-side shutoff valve 117.

The outdoor unit of the multi-split air conditioning system refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, each indoor unit of the multi-split air conditioning system includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

A compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas. In the cooling mode of operation of the multi-split air conditioning system 100, the compressor 111 serves to compress refrigerant gas in a high-temperature and high-pressure state and discharge the compressed refrigerant gas. The refrigerant discharged from the compressor 111 flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

The expansion valve consists of a valve body and a coil and is used for throttling, depressurizing and regulating flow. The expansion valve in the multi-split air conditioning system can make the liquid refrigerant with medium temperature and high pressure become low-temperature and low-pressure wet steam through the throttling, then the refrigerant absorbs heat in the evaporator to achieve the refrigeration effect, and the flow of the valve is controlled through the superheat degree change of the outlet of the evaporator. Also, the outdoor expansion valve 114 may expand the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant when the multi-split air conditioning system 100 operates in the cooling mode. The evaporator evaporates the refrigerant expanded in the electronic expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The multi-split air conditioning system can adjust the temperature of the indoor space throughout the cycle.

The

indoor units

12 and 13 take the indoor unit 12 as an example of an indoor unit, and the indoor unit is usually mounted on an indoor wall surface or the like. For another example, an indoor unit (not shown in fig. 1) is also an indoor unit type of the indoor unit. The multi-split air conditioning system may include an outdoor unit and 2 or more indoor units, and a controller (not shown) for controlling each of the indoor units and the outdoor unit.

An indoor unit 12, including: an expansion valve 121, an expansion valve 122, a heat exchanger 123, a heat exchanger 124, a temperature sensor 125, and a humidity sensor 126.

An indoor unit 13, including: an expansion valve 131, an expansion valve 132, a heat exchanger 133, a heat exchanger 134, a temperature sensor 135, and a humidity sensor 136.

In the embodiment shown in the present application, the controller 14 is a device capable of generating an operation control signal according to the command operation code and the timing signal, and instructing the multi-split air conditioning system to execute the control command. Illustratively, the controller may be a Central Processing Unit (CPU), a Network Processor (NP), a Digital Signal Processor (DSP), a microprocessor, a microcontroller, a Programmable Logic Device (PLD), or any combination thereof. The controller may also be other devices with processing functions, such as a circuit, a device, or a software module, which is not limited in any way by the embodiments of the present application.

In addition, the controller 14 may be configured to control operations of various components within the multi-split air conditioning system 100, so that the various components of the multi-split air conditioning system 100 operate to implement various predetermined functions of the multi-split air conditioning system.

In some embodiments, the controller 14 may be integrated into the outdoor unit 11, that is, the outdoor unit 11 may control operations of various components in the multi-split air conditioning system 100.

In some embodiments, the multi-machine air conditioning system 100 may also have a remote control attached thereto that has the capability to communicate with the controller 14, for example, using infrared or other communication means. The remote controller is used for various controls of the multi-split air conditioning system by a user, and realizes interaction between the user and the multi-split air conditioning system 100.

Fig. 3 is a schematic structural diagram of an outdoor unit 11 exemplarily provided in the embodiment of the present application. As shown in fig. 3, the outdoor unit 11 further includes a humidity sensor 118, a temperature sensor 119, and an electronic expansion valve 121. In some embodiments, lines D, E, S, and C shown in fig. 3 are all refrigerant flow lines. In the cooling mode, the refrigerant flows through the discharge port of the compressor 111, the line D, the line C, the line E, the line S, and the suction port of the compressor 111 in this order.

In some embodiments, a humidity sensor 118 and a temperature sensor 119 are connected to the controller 14, and the humidity sensor 118 and the temperature sensor 119 may be disposed at an exhaust port of the compressor 111 to detect a discharge port temperature value and a humidity value of the compressor 111 and transmit the detected discharge port temperature value and humidity value of the compressor 111 to the controller 14.

Fig. 4 is a block diagram illustrating a hardware configuration of a multi-split air conditioning system according to an exemplary embodiment of the present application. As shown in fig. 4, the multi-split air conditioning system 100 may further include one of: a communication interface 130 and a memory 140.

In some embodiments, the communication interface 130 is used to establish communication connections with other network entities, such as with terminal devices. The communication interface 130 may include a Radio Frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, a GPS module, and the like. Taking the RF module as an example, the RF module can be used for receiving and transmitting signals, and particularly, transmitting the received information to the controller 14 for processing; in addition, the signal generated by the controller 14 is sent out. In general, the RF circuit may include, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like.

The memory 140 may be used to store software programs and data. The controller 14 performs various functions of the multi-split air conditioning system 100 and data processing by executing software programs or data stored in the memory 140. The memory 140 may include high speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. The memory 140 stores an operating system that enables the multi-split air conditioning system 100 to operate. The memory 140 may store an operating system and various application programs, and may also store codes for executing the control method of the multi-split air conditioning system provided in the embodiment of the present application.

Those skilled in the art will appreciate that the hardware configuration shown in fig. 4 does not constitute a limitation of the multi-split air conditioning system, which may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

As shown in fig. 5, an embodiment of the present application provides a control method for a multi-split air conditioning system, which is applied to the controller 14 in the multi-split air conditioning system 100 shown in fig. 4, and the method includes the following steps:

s101, obtaining the return air temperature of each indoor unit through at least one first temperature sensor, and obtaining the environmental humidity of each indoor unit through at least one humidity sensor.

Wherein, the return air temperature of each indoor set is the air temperature of the return air inlet department of each indoor set, also each indoor ambient temperature.

Illustratively,

temperature sensor

125, 135 in fig. 2 are used to detect the return air temperature of at least one indoor unit, and

humidity sensor

126 and 136 are used to detect at least one indoor humidity.

Optionally, when the multi-split air conditioning system operates in the cooling mode or the dehumidification mode, the controller may periodically obtain the return air temperature and the indoor humidity of each indoor unit at a preset frequency. Therefore, the control method provided by the embodiment of the application is periodically executed at the preset frequency.

The preset frequency may be 3 seconds/time, 5 seconds/time, 8 seconds/time, or other possible frequencies.

And S102, respectively determining return air temperature difference and humidity difference of each indoor unit.

Wherein, the return air temperature difference is the difference between the return air temperature and the set temperature. The set temperature is the temperature that the user sets through the remote controller and wants to reach indoors. The humidity difference is a difference between the indoor humidity and the set humidity. The set humidity is the humidity that the user wants to reach indoors set by the remote controller. It is understood that the set temperatures may be the same or different, and the set humidities may be the same or different. In a particular implementation, the return air temperature is T _i To show that the set temperature is T _s To express that the return air temperature difference is (T) _i -T _s ) And is denoted by c.

And S103, if the maximum return air temperature difference in the at least one indoor unit is smaller than a temperature threshold value and the maximum humidity difference in the at least one indoor unit is smaller than a humidity threshold value, controlling the air conditioner outdoor unit to operate in a high sensible heat mode.

The temperature threshold is a temperature value determined based on a set temperature of the multi-split air conditioning system. Alternatively, the temperature threshold may be a, which may be a possible temperature value such as 0.5 ℃, 1 ℃,2 ℃, etc.

It should be understood that the temperature threshold a refers to a comfortable temperature fluctuation value statistically obtained based on a large amount of user data, which is pre-stored in the multi-split air conditioning system. After acquiring the set temperature determined by the user, the controller may modify the set temperature based on the temperature threshold value a to obtain the maximum return air temperature difference.

The humidity threshold may be b, which may be 3%, 4%, 5%, etc. of possible humidity values

It should be understood that the humidity threshold b is an allowable floating range of the actual humidity in the comfort range compared to the set humidity. After acquiring the set humidity determined by the user, the controller may modify the set humidity based on the humidity threshold b to obtain the maximum humidity difference.

The high sensible heat mode refers to an operation mode of the multi-split air conditioning system during refrigeration or dehumidification. The sensible heat ratio when the multi-split air conditioning system operates in the high-sensible-heat mode is higher than that when the multi-split air conditioning system operates in other modes.

Optionally, if the maximum return air temperature difference of the indoor unit is smaller than the temperature threshold and the indoor maximum humidity difference is smaller than the humidity threshold, the controller controls the outdoor unit to operate in a high sensible heat mode.

For example, when the set temperature of the air conditioner is 25 ℃, the set humidity is 49%, the temperature threshold a is 2%, and the humidity threshold b is 5%, if the return air temperature is 26 ℃ and the indoor humidity is 52%, then the difference between the return air temperature of the air conditioner and the set temperature is small, and the multi-split air conditioning system consumes less energy per unit time to reduce the indoor temperature, i.e., the apparent load is small, so the proportion of the apparent load to the total load is small, i.e., the apparent heat ratio of the air conditioner is small. At this time, if the multi-split air conditioning system still operates according to the original parameters, the generated refrigerating capacity is too high, and unnecessary energy is consumed. Therefore, the controller controls each indoor unit of the air conditioner to operate in a high sensible heat mode, the sensible heat ratio of the multi-split air conditioning system is improved, and the energy consumption of the air conditioner is reduced.

Optionally, a plurality of high sensible heat mode levels may be pre-stored in the multi-split air conditioning system, and each high sensible heat mode level has a level parameter.

In a specific implementation, the above-mentioned ranking parameter may be F _b And (4) showing.

Wherein, F _b The value is set through an outdoor machine control substrate or is assigned after calculation through a centralized control system, and the value is generally 1, 2 and 3, 8230, 8230. F _b The higher the value is, the higher the corresponding high sensible heat mode level is, and the higher the sensible heat ratio can be realized.

It should be understood that a centralized control system is disposed in the multi-split air conditioning system, and the centralized control system is connected to each subsystem of the multi-split air conditioning system, and is used for centrally processing each parameter of the air conditioner and calculating each numerical value of the air conditioner.

The subsystems can be air treatment systems composed of a multi-split system, a dehumidifier and the like.

Optionally, the controller may determine the target level parameter of the high sensible heat mode according to the set temperature and the maximum return air temperature difference of each indoor unit.

Exemplary, F _b The value-taking method is shown in formula (1):

F _b ＝p-max(T _i -T _s ) +1 formula (1)

Wherein, p is the lowest return air temperature difference value when the unit enters a high sensible heat mode, and the value range is more than or equal to 0 and less than or equal to F _b ≤p。

Further, the controller may control the outdoor unit to operate at a target high sensible heat level corresponding to the target level parameter according to the preset corresponding relationship and the target level parameter.

The preset corresponding relation is used for indicating the corresponding relation between at least one grade parameter and at least one high sensible heat grade.

For example, the preset correspondence may be implemented in the form of a correspondence table. Table 1 shows a corresponding relationship table, as shown in Table 1, the preset corresponding relationship may include a plurality of F _b Value and a plurality of high sensible heat levels, and, a plurality of F _b The value has a one-to-one correspondence with a plurality of high sensible heat levels.

TABLE 1

Exemplary if F _b The value is 1, the controller can control the outdoor unit to operate in the high sensible heat level 1 mode. If F _b The value is 3, the controller may control the outdoor unit to operate in the high sensible heat level 3 mode.

In one possible implementation manner, the controller may specifically implement the following steps S11 to S13 to control the multi-split air conditioning system to operate the high heat development mode:

and S11, determining an evaporation temperature correction value according to the maximum return air temperature difference and a target return air temperature difference corresponding to the target high sensible heat level.

Wherein the evaporation temperature is the critical temperature at which the refrigerant changes from liquid to gas. The evaporation temperature correction value is used to correct the set evaporation temperature.

Optionally, the target return air temperature difference value has a corresponding relationship with the high sensible heat level and/or the level parameter. Therefore, the controller can determine the target return air temperature difference value based on the preset corresponding relation according to the target high sensible heat level and/or the target level parameter.

Illustratively, the preset correspondence may be implemented in the form of a correspondence table. Table 2 shows a correspondence table, as shown in Table 2, the correspondence table may include a plurality of F _b A value, a plurality of high sensible level values, and a plurality of target return air temperature difference values. And a plurality of F _b The value, the plurality of high sensible heat level values and the plurality of target return air temperature difference values have a one-to-one correspondence relationship.

In a particular implementation, the target return air temperature difference is denoted by c _ t.

TABLE 2

F _b Value of	High sensible heat level	c _ t value
			F _b ＝1	High sensible heat level 1	c_t＝1
F _b ＝2	High sensible heat level 2	c_t＝2
			F _b ＝3	High sensible heat level 3	c_t＝3
F _b ＝4	High sensible heat level 4	c_t＝4

Illustratively, if the centralized control system issues F _b The value is 1, and the target return air temperature difference value c _ t is 1. If F is sent out by the centralized control system _b With a value of 3, the target return air temperature difference value c _ t is 3.

In some embodiments, the controller may determine the actual return air temperature difference between the return air temperature of each indoor unit and the set temperature. Further, the difference between the target return air temperature difference value and the actual return air temperature difference value is determined as the evaporation temperature correction value.

In a specific implementation, the difference between the target return air temperature difference value c _ t and the actual return air temperature difference value c is represented by d, and the calculation method is as shown in formula (2):

d = c _ t-c formula (2)

The evaporation temperature correction value of the target evaporation temperature is represented by e, and is calculated as shown in formula (3):

e＝K _pt ×(d _(n) －d _(n-1) )+K _it ×d _(n) formula (3)

Specifically, K _pt 、K _it Is a fixed coefficient. d _(n) Is the difference between the current return air temperature difference value c and the target return air temperature difference value c _ t. d _(n-1) The difference value between the last return air temperature difference value c and the target return air temperature difference value c _ t. Optionally, K _pt 、K _it May all be 1. The value range of the evaporation temperature correction value e is more than or equal to 0 and less than or equal to 10.

When a centralized control system is arranged in the multi-split air conditioning system, the controller corrects the evaporating temperature by taking the return air temperature as an intermediate variable and calculates F according to the controller _b The operating frequency of the compressor is controlled to enter a high sensible operating mode.

And S12, determining a target evaporation temperature according to the preset evaporation temperature and the evaporation temperature correction value when the multi-split air conditioning system operates.

In some embodiments, if d >0, then e >0. If d is less than or equal to 0, e =0.

In a particular implementation, the target evaporation temperature is expressed in Teo. The method of correcting the target evaporation temperature is shown in formula (4):

teo = Teoset + e formula (4)

Specifically, teoset sets an evaporation temperature for the system, which may be a default evaporation temperature when the multi-split air conditioning system is in operation, or may be an evaporation temperature value set by a user through an air conditioner remote controller.

And S13, adjusting the operation frequency of a compressor of the multi-split air-conditioning system according to the target evaporation temperature.

In some embodiments, the controller may compare the target evaporation temperature with the actual evaporation temperature, and adjust an operating frequency of a compressor of the multi-split air conditioning system based on the comparison result.

Specifically, if the actual evaporating temperature is greater than the target evaporating temperature, the controller may increase the operating frequency of the compressor. And if the actual evaporation temperature is equal to the target evaporation temperature, controlling the running frequency of the compressor to be kept unchanged. And if the actual evaporation temperature is less than the target evaporation temperature, reducing the running frequency of the compressor.

In some embodiments, if there is a centralized control system and a separate dehumidifier in the multi-split air conditioning system, the controller may set F _b The control mode of the high sensible heat mode is referred to as S11 to S13, and the detailed description is omitted here.

In some embodiments, if there is a centralized control system but there is no separate dehumidifier in the multi-split air conditioning system, the controller may also set F _b The control mode of the high sensible heat mode is referred to as S11 to S13, and the detailed description is omitted here. However, in a specific implementation, since there is no separate dehumidifier in the multi-split air conditioning system, this control method may cause uncontrollable indoor humidity.

In another possible implementation manner, if no special centralized control system is provided in the multi-split air-conditioning system, the controller adjusts the operating frequency of the compressor of the multi-split air-conditioning system according to the target outlet air temperature corresponding to the target high sensible heat level.

Optionally, the target air outlet temperature and the actual air outlet temperature are compared, and the operating frequency of a compressor of the multi-split air conditioning system is adjusted based on the comparison result.

Specifically, the controller can adjust the operating frequency of the compressor of the multi-split air conditioning system according to the target air outlet temperature corresponding to the target high sensible heat level. And if the actual air outlet temperature is lower than the target air outlet temperature, reducing the operating frequency of the compressor. And if the actual air outlet temperature is greater than or equal to the target air outlet temperature, controlling the running frequency of the compressor to be kept unchanged.

In a particular implementation, the target outlet air temperature is represented by tset. The outdoor unit is set according to F _b Sets a target outlet air temperature tset, and controls the frequency change of the outdoor unit compressor according to the actual outlet air temperature and the target outlet air temperature tsetAnd (4) melting.

Further, the controller can control the outdoor unit to operate at a high sensible heat target level according to the preset corresponding relation and the target outlet air temperature.

The preset corresponding relation is used for indicating the corresponding relation between at least one high sensible heat target level and at least one target outlet air temperature.

For example, the preset correspondence may be implemented in the form of a correspondence table. Table 3 shows a correspondence table, as shown in table 3, the preset correspondence may include a plurality of high sensible heat target levels and a plurality of target outlet air temperatures tset, and the plurality of high sensible heat target levels and the plurality of target outlet air temperatures tset have a one-to-one correspondence.

TABLE 3

High sensible target grade	tset value
		High sensible target level 1	tset＝14
High sensible target level 2	tset＝15
		High sensible target grade 3	tset＝16
High sensible target level 4	tset＝17

Exemplarily, if the high sensible heat target level is 1, the target outlet air temperature tset is 14 ℃; if the high sensible heat target grade value is 4, the target outlet air temperature tset is 17 ℃.

In some embodiments, when the actual outlet air temperature < tset, the compressor frequency is decreased; when the actual outlet air temperature is larger than or equal to tset, the frequency of the compressor is unchanged.

For example, if the target outlet air temperature tset is 26 ℃, when the actual outlet air temperature is 25 ℃, the controller controls the outdoor unit compressor to reduce the operating frequency; and when the actual outlet air temperature is 27 ℃, the controller controls the outdoor unit compressor to keep the current running frequency.

It should be understood that in a conventional air conditioning system, when the return air temperature difference of the indoor unit is equal to 0, i.e., the return air temperature is consistent with the set temperature, the compressor stops operating. F _b After the value is set, when the return air temperature is consistent with the set temperature, the controller controls the compressor of the outdoor unit to reduce the operation frequency, namely, the outdoor unit enters a high sensible heat operation mode.

In some embodiments, if the maximum return air temperature difference of each indoor unit is greater than or equal to a temperature threshold value, and/or the indoor maximum humidity difference is greater than or equal to a humidity threshold value, the outdoor unit of the air conditioner is controlled to end the high-heat-generation mode.

When the multi-split air conditioning system operates in the high sensible heat mode, the controller can also periodically acquire the return air temperature and the indoor humidity of each indoor unit at a preset frequency, and judges whether the high sensible heat mode is finished.

The predetermined frequency may be 3 seconds/time, 5 seconds/time, 8 seconds/time, or other possible frequencies.

For example, when the set temperature of the air conditioner is 25 ℃, the temperature threshold a is 2 ℃, and if the return air temperature is 28 ℃, in this case, the temperature is greater than 25 ℃ plus 2 ℃, the difference between the return air temperature of the air conditioner and the set temperature is large, so that the proportion of the apparent load to the total load is large, that is, the sensible heat ratio of the air conditioner is large. At this time, if the multi-split air conditioning system still operates according to the original parameters, the generated refrigerating capacity is too low, and a good refrigerating effect cannot be achieved. Therefore, the controller controls the outdoor unit to finish the operation of the high heat display mode so as to reduce the heat display ratio of the multi-split air conditioning system.

The technical scheme provided by the embodiment of the application at least has the following beneficial effects: the scheme provides an operation mode of the multi-split air conditioning system, namely a high sensible heat mode, and the sensible heat ratio of the multi-split air conditioning system in the high sensible heat mode is higher than that in other modes. In addition, the method and the device determine whether the judgment condition of the high-heat-generation running mode is met, namely the set temperature threshold and the set humidity threshold, according to the actual temperature and the actual humidity. When the judgment condition of the operation high-heat-development mode is met, the indoor temperature and humidity are appropriate, so that the operation high-heat-development mode can be controlled, the energy consumed by adjusting the indoor temperature and humidity is reduced, and the purpose of reducing energy consumption is achieved.

In some embodiments, in combination with fig. 5 described above, the control method of the multi-split air conditioning system provided in the embodiments of the present application may also be described as a logic flow chart as shown in fig. 6. As shown in fig. 6:

s1, a controller controls a multi-split air conditioning system to enter a high sensible heat operation mode, and when the multi-split air conditioning system operates in the high sensible heat mode, the controller can judge whether a centralized control system is arranged in the multi-split air conditioning system or not. The following steps S2 to S7 are performed when there is a centralized control system, and the following steps S8 to S10 are performed when there is no centralized control system.

And S2, calculating a difference d between the actual return air temperature difference and the target return air temperature difference by the controller, wherein the actual return air temperature difference is the difference between the actual return air temperature and the set temperature.

And S3, calculating a target evaporation temperature correction value e according to a difference d between the actual return air temperature difference value and the target return air temperature difference value.

Optionally, if d is greater than 0, e is calculated according to the above formula (3). If d is less than or equal to 0, then e is 0.

And S4, calculating the target evaporation temperature Teo according to the target evaporation temperature correction value e. The calculation method is as described in the above equation (4).

Alternatively, if the actual evaporation temperature — the target evaporation temperature >0, the following step S5 is executed. If the actual evaporation temperature — the target evaporation temperature is <0, the following step S6 is executed. If the actual evaporation temperature — the target evaporation temperature =0, the following step S7 is executed.

And S5, controlling to increase the running frequency of the compressor by the controller.

And S6, controlling to reduce the running frequency of the compressor by the controller.

And S7, the controller controls the running frequency of the compressor to be unchanged.

And S8, setting a target air outlet temperature tset by the controller. Optionally, if the actual outlet air temperature of the air conditioner is less than tset, the following step S9 is executed. If the actual outlet air temperature of the air conditioner is greater than or equal to tset, the following step S10 is executed.

And S9, the controller controls to reduce the running frequency of the compressor.

And S10, the controller controls the running frequency of the compressor to be unchanged.

It can be seen that the foregoing describes the solution provided by the embodiments of the present application primarily from a methodological perspective. In order to implement the functions, the embodiments of the present application provide corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed in hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

In the embodiment of the present application, the controller may be divided into the functional modules according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. Optionally, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and another division manner may be provided in actual implementation.

As shown in fig. 7, the controller 14 includes a processor 1001, and optionally, a memory 140 and a communication interface 130 connected to the processor 1001. The processor 1001, the memory 140, and the communication interface 130 are connected by a bus 1004.

The processor 1001 may be a Central Processing Unit (CPU), a Network Processor (NP), a Digital Signal Processor (DSP), a microprocessor, a microcontroller, a Programmable Logic Device (PLD), or any combination thereof. The processor 1001 may also be any other device with processing capabilities, such as a circuit, a device, or a software module. The processor 1001 may also include a plurality of CPUs, and the processor 1001 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores that process data (e.g., computer program instructions).

The memory 140 may be a read-only memory (ROM) or other type of static memory device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic memory device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disk read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, although the embodiments of the present application are not limited in this respect. The memory 140 may be separate or integrated with the processor 1001. Among other things, the memory 140 may contain computer program code. The processor 1001 is configured to execute the computer program codes stored in the memory 140, so as to implement a control method of the multi-split air conditioning system provided by the embodiment of the present application.

Communication interface 130 may be used to communicate with other devices or communication networks (e.g., ethernet, radio Access Network (RAN), wireless Local Area Networks (WLAN), etc.). The communication interface 130 may be a module, a circuit, a transceiver, or any device capable of enabling communication.

The bus 1004 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus 1004 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 7, but this is not intended to represent only one bus or type of bus.

Embodiments of the present invention also provide a computer-readable storage medium including computer-executable instructions, which, when executed on a computer, cause the computer to perform the method for controlling a multi-split air conditioning system as provided in the above embodiments.

Embodiments of the present invention further provide a computer program product, where the computer program product may be directly loaded into a memory and contains a software code, and after the computer program product is loaded and executed by a computer, the computer program product may implement the method for controlling a multi-split air conditioning system provided in the foregoing embodiments.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in this invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

Through the description of the foregoing embodiments, it will be clear to those skilled in the art that, for convenience and simplicity of description, only the division of the functional modules is illustrated, and in practical applications, the above function distribution may be completed by different functional modules as needed, that is, the internal structure of the apparatus may be divided into different functional modules to complete all or part of the above described functions.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical function division, and there may be other division ways in actual implementation. For example, various elements or components may be combined or may be integrated into another device, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. Units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed to a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A multi-split air conditioning system, comprising:

an outdoor unit;

each indoor unit in the at least one indoor unit is respectively connected with the outdoor unit through a refrigerant connecting pipeline;

at least one first temperature sensor for detecting the return air temperature of each indoor unit;

at least one humidity sensor for detecting the ambient humidity of each indoor unit;

a controller configured to:

the return air temperature of each indoor unit is obtained through the at least one first temperature sensor, and the environmental humidity of each indoor unit is obtained through the at least one humidity sensor;

respectively determining the return air temperature difference and the humidity difference value of each indoor unit, wherein for one indoor unit, the return air temperature difference is the difference value between the return air temperature of the indoor unit and the set temperature of the indoor unit, and the humidity difference value is the difference value between the environmental humidity of the indoor unit and the set humidity of the indoor unit;

and if the maximum return air temperature difference in the at least one indoor unit is smaller than a temperature threshold value and the maximum humidity difference in the at least one indoor unit is smaller than a humidity threshold value, controlling the outdoor unit to operate in a high sensible heat mode, wherein the sensible heat ratio of the multi-split air conditioning system in the high sensible heat mode is higher than that in other operation modes.

2. The multi-split air conditioning system as claimed in claim 1, wherein the controller is further configured to:

and if the maximum return air temperature difference is larger than or equal to the temperature threshold value and/or the maximum humidity difference value is larger than or equal to the humidity threshold value, controlling the outdoor unit to stop operating the high sensible heat mode.

3. A multi-split air conditioning system as recited in claim 1, wherein said controller is specifically configured to:

determining a target grade parameter of the high sensible heat mode according to the maximum return air temperature difference;

and controlling the outdoor unit to operate at a target high sensible heat level corresponding to the target level parameter according to a preset corresponding relation and the level parameter, wherein the preset corresponding relation is used for indicating the corresponding relation between at least one level parameter and at least one high sensible heat level.

4. A multi-split air conditioning system as claimed in claim 3, wherein the outdoor unit includes a compressor;

the controller further configured to:

determining an evaporation temperature correction value according to the maximum return air temperature difference and a target return air temperature difference value corresponding to the target high sensible heat level;

determining a target evaporation temperature according to a preset evaporation temperature and the evaporation temperature correction value when the multi-split air-conditioning system operates;

and adjusting the operating frequency of a compressor of the multi-split air-conditioning system according to the target evaporation temperature.

5. The multi-split air conditioning system as claimed in claim 4, further comprising:

a second temperature sensor for detecting an actual evaporating temperature of the evaporator;

the controller is specifically configured to:

if the actual evaporation temperature is greater than the target evaporation temperature, increasing the operating frequency of the compressor;

if the actual evaporation temperature is equal to the target evaporation temperature, controlling the running frequency of the compressor to be kept unchanged;

and if the actual evaporation temperature is less than the target evaporation temperature, reducing the operating frequency of the compressor.

6. A multi-split air conditioning system as claimed in claim 4 or 5, wherein the controller is specifically controlled to:

determining a difference between the target return air temperature difference and the maximum return air temperature difference;

and determining the evaporation temperature correction value according to the difference between the target return air temperature difference value and the maximum return air temperature difference value.

7. A multi-split air conditioning system as set forth in claim 3,

the controller further configured to:

and adjusting the operating frequency of a compressor of the multi-split air conditioning system according to the target air outlet temperature corresponding to the target high sensible heat level.

8. A multi-split air conditioning system as claimed in claim 7, further comprising:

at least one third temperature sensor for detecting the outlet air temperature of each indoor unit;

the controller is specifically controlled as follows:

the actual air outlet temperature of the indoor unit corresponding to the maximum air return temperature value is obtained through the third temperature sensor;

if the actual air outlet temperature is lower than the target air outlet temperature, reducing the running frequency of the compressor;

and if the actual air outlet temperature is greater than or equal to the target air outlet temperature, controlling the running frequency of the compressor to be kept unchanged.

9. A control method of a multi-split air conditioning system, the method comprising:

the method comprises the steps that return air temperature of each indoor unit is obtained through at least one first temperature sensor, and the environment humidity of each indoor unit is obtained through at least one humidity sensor;

respectively determining the return air temperature difference and the humidity difference value of each indoor unit, wherein for one indoor unit, the return air temperature difference is the difference value between the return air temperature of the indoor unit and the set temperature of the indoor unit, and the humidity difference value is the difference value between the environment humidity of the indoor unit and the set humidity of the indoor unit;

10. The method of claim 9, further comprising:

determining an evaporation temperature correction value according to the maximum return air temperature difference and a target evaporation temperature difference value corresponding to the target high sensible heat level;