Method for controlling variable refrigerant flow air conditioner, variable refrigerant flow air conditioner, and storage medium

1 . A method for controlling a variable refrigerant flow (VRF) air conditioner, comprising:

obtaining set temperatures and indoor ambient temperatures of respective environments where a plurality of indoor units of the VRF air conditioner that have started are located;

identifying a target indoor unit of the plurality of indoor units that is in a warming stage based on the indoor ambient temperature of the environment of the target indoor unit being less than or equal to a preset temperature, wherein the preset temperature is greater than the set temperature for the environment of the target indoor unit;

determining a target superheat degree according to a working condition parameter of the target indoor unit; and

adjusting an operating parameter of an electronic expansion valve of the target indoor unit according to the target superheat degree.

2 . The method for controlling the VRF air conditioner according to claim 1 , wherein, after the adjusting the operating parameter of the electronic expansion valve of the target indoor unit according to the target superheat degree, the method further comprises:

obtaining a current indoor ambient temperature of the environment of the target indoor unit; and

in response to determining that the current indoor ambient temperature is within a preset temperature range, closing the electronic expansion valve of the target indoor unit, wherein the set temperature of the target indoor unit is within the preset temperature range, and the preset temperature range is based on the set temperature.

3 . The method for controlling the VRF air conditioner according to claim 1 , wherein, after the adjusting the operating parameter of the electronic expansion valve of the target indoor unit according to the target superheat degree, the method further comprises:

obtaining current indoor ambient temperatures of the environments where the plurality of indoor units are located;

in response to determining that the current indoor ambient temperatures of the environments where the plurality of indoor units are located are within corresponding preset temperature ranges that include, and are based on, set temperatures for the environments, controlling the VRF air conditioner to standby;

determining whether each of the plurality of indoor units has a capability requirement; and

in response to determining that the target indoor unit has the capability requirement, obtaining the current indoor ambient temperature of the environment where the target indoor unit is located.

4 . The method for controlling the VRF air conditioner according to claim 3 , wherein the determining whether each of the plurality of indoor units has the capability requirement comprises, for each of the plurality of indoor units:

determining a cold load and a sensible heat load corresponding to the respective indoor unit, wherein the cold load is heat carried away from an environment where the respective indoor unit is located that is required to maintain the indoor ambient temperature for the environment where the respective indoor unit is located, and the sensible heat load is a cold load generated by removing sensible heat through reducing the indoor ambient temperature for the environment where the respective indoor unit is located; and

determining that the respective indoor unit has the capability requirement based on a sum of the cold load and the sensible heat load for the respective indoor unit being greater than zero.

5 . The method for controlling the VRF air conditioner according to claim 1 , wherein the determining the target superheat degree according to the working condition parameter of the target indoor unit comprises:

determining a capability requirement ratio of the target indoor unit comprising a ratio of an actual capability requirement of the target indoor unit to a rated nominal capability of the target indoor unit; and

determining the target superheat degree according to the capability requirement ratio, the indoor ambient temperature of the environment where the target indoor unit is located, an outdoor ambient temperature, and a target evaporation temperature of the target indoor unit, wherein the target superheat degree is positively correlated with the capability requirement ratio.

6 . The method for controlling the VRF air conditioner according to claim 1 , wherein the adjusting the operating parameter of the electronic expansion valve of the target indoor unit according to the target superheat degree comprises:

determining an actual superheat degree of the target indoor unit according to a difference between an outlet temperature of a heat exchanger of the target indoor unit and a middle temperature of the heat exchanger;

determining an operating opening degree and an operating duration of the electronic expansion valve of the target indoor unit according to the difference between the actual superheat degree and the target superheat degree; and

controlling the electronic expansion valve of the target indoor unit to operate for the operating duration according to the operating opening degree.

7 . The method for controlling the VRF air conditioner according to claim 1 , further comprising:

determining a target operating frequency according to a target evaporation temperature of the target indoor unit; and

controlling a compressor to operate according to the target operating frequency.

8 . The method for controlling the VRF air conditioner according to claim 7 , wherein the determining the target operating frequency according to the target evaporation temperature of the target indoor unit comprises:

determining respective target evaporation temperatures of the plurality of indoor units;

obtaining a minimum target evaporation temperature of the target evaporation temperatures;

determining respective central temperatures of heat exchangers of the plurality of indoor units;

determining an average value of the central temperatures;

determining a difference between the average value of the central temperatures and the minimum target evaporation temperature; and

determining the target operating frequency based on the difference between the average value of the central temperatures and the minimum target evaporation temperature.

9 . The method for controlling the VRF air conditioner according to claim 1 , wherein after the identifying the target indoor unit of the plurality of indoor units that is in the warming stage, the method further comprises:

periodically detecting an outlet temperature of an outdoor heat exchanger of the target indoor unit; and

adjusting a rotating speed of an outdoor fan of the target indoor unit according to the outlet temperature.

10 . The method for controlling the VRF air conditioner according to claim 1 , wherein the target indoor unit is operating in a cooling mode.

11 . A controller for a variable refrigerant flow (VRF) air conditioner comprising:

one or more processors; and

a memory storing a program for controlling the VRF air conditioner, wherein the program is executable by the one or more processors to implement a method comprising:

obtaining set temperatures and indoor ambient temperatures of respective environments where a plurality of indoor units of the VRF air conditioner that have started are located;

identifying a target indoor unit of the plurality of indoor units that is in a warming stage based on the indoor ambient temperature of the environment of the target indoor unit being less than or equal to a preset temperature, wherein the preset temperature is greater than the set temperature for the environment of the target indoor unit;

determining a target superheat degree according to a working condition parameter of the target indoor unit; and

adjusting an operating parameter of an electronic expansion valve of the target indoor unit according to the target superheat degree.

12 . The controller of claim 11 , wherein the method further comprises, after the adjusting the operating parameter of the electronic expansion valve of the target indoor unit according to the target superheat degree:

obtaining current indoor ambient temperatures of the environments where the plurality of indoor units are located;

in response to determining that the current indoor ambient temperatures of the environments where the plurality of indoor units are located are within corresponding preset temperature ranges that include, and are based on, set temperatures for the environments, controlling the VRF air conditioner to standby; and

in response to determining that the target indoor unit has a capability requirement, returning to obtain the current indoor ambient temperature of the environment where the target indoor unit is located.

13 . A variable refrigerant flow (VRF) air conditioner system comprising:

at least one outdoor unit;

a plurality of indoor units; and

a controller comprising:

one or more processors; and

a memory comprising instructions that, when executed by the one or more processors causes the one or more processors to, when the plurality of indoor units have been started and are operating in a cooling mode:

obtain set temperatures and indoor ambient temperatures of respective environments where the plurality of indoor units are located;

identifying a target indoor unit of the plurality of indoor units that is in a warming stage based on the indoor ambient temperature of the environment of the target indoor unit being less than or equal to a preset temperature, wherein the preset temperature is greater than the set temperature for the environment of the target indoor unit;

determining a target superheat degree according to a working condition parameter of the target indoor unit; and

adjusting an operating parameter of an electronic expansion valve of the target indoor unit according to the target superheat degree.

14 . The VRF air conditioner system of claim 13 , wherein the instructions further cause the processor to, after adjusting the operating parameter of the electronic expansion valve of the target indoor unit according to the target superheat degree:

obtain current indoor ambient temperatures of the environments where the plurality of indoor units are located;

in response to a determination that the current indoor ambient temperatures of the environments where the plurality of indoor units are located are within corresponding preset temperature ranges that include, and are based on, set temperatures for the environments, controlling the VRF air conditioner to standby; and

in response to a determination that the target indoor unit has a capability requirement, return to obtain the current indoor ambient temperature of the environment where the target indoor unit is located.