CN114484786A

CN114484786A - Temperature and humidity control method of air conditioner, controller, air conditioner and storage medium

Info

Publication number: CN114484786A
Application number: CN202011272088.4A
Authority: CN
Inventors: 曹文强; 吴亚明
Original assignee: Shenzhen Envicool Technology Co Ltd
Current assignee: Shenzhen Envicool Technology Co Ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2022-05-13

Abstract

The invention relates to a temperature and humidity control method of an air conditioner, a controller, the air conditioner and a storage medium, wherein the method comprises the following steps: detecting the ambient temperature T1 of the cabinet; when the ambient temperature T1 is greater than the preset temperature C1, controlling the air conditioner to operate in a pure refrigeration mode; detecting the ambient humidity H1 and the ambient temperature T2 of the cabinet; when the cabinet has a dehumidification requirement and the environmental temperature T2 is less than the preset temperature C2, controlling the air conditioner to operate in a refrigeration and dehumidification mode; detecting the ambient humidity H2 and the ambient temperature T3 of the cabinet; when the cabinet has a dehumidification requirement and the ambient temperature T3 is less than the preset temperature C3, controlling the air conditioner to operate in a thermal compensation dehumidification mode; detecting the environmental humidity H3 of the cabinet and according to the environmental humidity H3; when the cabinet has no dehumidification requirement, controlling the air conditioner to operate in a thermal compensation refrigeration mode; detecting the ambient temperature T4 of the cabinet; and when the ambient temperature T4 is greater than the preset temperature C4, controlling the air conditioner to operate in a pure cooling mode.

Description

Temperature and humidity control method of air conditioner, controller, air conditioner and storage medium

Technical Field

The invention relates to the technical field of air conditioners, in particular to a temperature and humidity control method of an air conditioner, a controller, the air conditioner and a storage medium.

Background

In a machine room (such as a data center machine room, a server machine room, etc.) or a cabinet (such as an outdoor cabinet, an equipment cabinet, a battery cabinet, etc.), a compressor of a conventional air conditioner stops operating when the temperature reaches a required temperature, the humidity is also out of control at the moment, and when the temperature and the humidity in the machine room or the cabinet suddenly rise, the compressor usually needs to be started after several minutes of protection time. In this time, the temperature and humidity fluctuation is large, and condensation may be generated on the wall surface of the cabinet, so that equipment in the machine room or the cabinet is damaged to a certain extent.

Disclosure of Invention

Accordingly, it is necessary to provide a temperature and humidity control method of an air conditioner, a controller, an air conditioner, and a storage medium, in order to solve the problem of large temperature and humidity control fluctuation of the conventional air conditioning system.

A temperature and humidity control method of an air conditioner comprises the following steps:

when the air conditioner is in an air supply mode or a standby mode, detecting the ambient temperature T1 of the cabinet and judging whether the ambient temperature T1 is greater than a preset temperature C1;

when the ambient temperature T1 is greater than the preset temperature C1, controlling the air conditioner to operate in a pure cooling mode;

detecting the ambient humidity H1 and the ambient temperature T2 of the cabinet, judging whether the cabinet has a dehumidification requirement or not according to the ambient humidity H1, and judging whether the ambient temperature T2 is less than a preset temperature C2 or not;

when the cabinet has a dehumidification requirement and the environment temperature T2 is less than a preset temperature C2, controlling the air conditioner to operate in a refrigeration and dehumidification mode;

detecting the environmental humidity H3 of the cabinet, and judging whether the cabinet has a dehumidification requirement according to the environmental humidity H3;

when the cabinet has no dehumidification demand, controlling the air conditioner to operate in a thermal compensation refrigeration mode;

detecting the environmental temperature T4 of the cabinet, and judging whether the environmental temperature T4 is greater than a preset temperature C4;

and when the ambient temperature T4 is greater than the preset temperature C4, controlling the air conditioner to operate in a pure refrigeration mode.

According to the temperature and humidity control method of the air conditioner, the air supply mode or the standby mode of the air conditioner is set, the pure refrigeration mode, the refrigeration dehumidification mode and the thermal compensation refrigeration mode are set, so that the operation mode of the air conditioner can be selected according to the ambient temperature and humidity of the cabinet, when the temperature of the cabinet is reduced due to dehumidification, the thermal compensation mode is adopted, the continuous reduction of the temperature is avoided, the full-load adjustment of refrigeration and dehumidification of the air conditioner can be realized, the non-stop operation of the air conditioner is ensured, and the change of the ambient temperature and the humidity of the cabinet is responded.

In one embodiment, after the step of controlling the air conditioner to operate in the cooling and dehumidifying mode when the cabinet requires dehumidification and the ambient temperature T2 is less than the preset temperature C2, the method further includes:

detecting the environmental humidity H2 and the environmental temperature T3 of the cabinet, judging whether the cabinet has a dehumidification requirement or not according to the environmental humidity H2, and judging whether the environmental temperature T3 is less than a preset temperature C3 or not;

when the cabinet has a dehumidification demand and the ambient temperature T3 is less than a preset temperature C3, controlling the air conditioner to operate in a thermal compensation dehumidification mode.

In one embodiment, the step of controlling the air conditioner to operate in the thermal compensation dehumidification mode when the cabinet has a dehumidification demand and the ambient temperature T3 is less than a preset temperature C3 includes:

when the cabinet has a dehumidification requirement and the ambient temperature T3 is less than a preset temperature C3, controlling the air conditioner to operate in a primary thermal compensation dehumidification mode;

detecting the environmental humidity H6 and the environmental temperature T7 of the cabinet, and judging whether the cabinet has a dehumidification requirement or not according to the environmental humidity H6;

when the cabinet has a dehumidification demand, judging whether the environment temperature T7 is greater than a preset temperature C7 or whether the duration time of the cabinet without the dehumidification demand is greater than a preset time T4 or not; when the cabinet has the dehumidification demand, ambient temperature T7 is greater than preset temperature C7, perhaps, when the cabinet does not have the dehumidification demand, the duration that the cabinet does not have the dehumidification demand is less than preset time T4, controls the air conditioner is with the operation of second grade thermal compensation dehumidification mode.

In one embodiment, after the step of controlling the air conditioner to operate in the secondary thermal compensation dehumidification mode, when the cabinet has a dehumidification demand, the ambient temperature T7 is greater than the preset temperature C7, or when the cabinet has no dehumidification demand, the duration of the cabinet having no dehumidification demand is less than the preset time T4, the method further includes:

detecting the ambient temperature T9 of the cabinet;

judging whether the ambient temperature T9 is less than or equal to a preset temperature C7;

when the cabinet has a dehumidification requirement and the ambient temperature T9 is less than or equal to a preset temperature C7, controlling the air conditioner to operate in a primary thermal compensation dehumidification mode.

In one embodiment, after the step of determining whether the ambient temperature T9 is less than or equal to the preset temperature C7, the method further includes:

when the cabinet has a dehumidification requirement and the environment temperature T9 is greater than the preset temperature C5, controlling the air conditioner to operate in a primary refrigeration dehumidification mode.

In one embodiment, the step of controlling the air conditioner to operate in the thermal compensation cooling mode when there is no dehumidification demand on the cabinet further includes:

and when the duration time of the cabinet without dehumidification demand is greater than the preset time t1, controlling the air conditioner to operate in a thermal compensation cooling mode.

In one embodiment, the step of controlling the air conditioner to operate in the cooling and dehumidifying mode when the cabinet requires dehumidification and the ambient temperature T2 is less than the preset temperature C2 includes:

when the cabinet has a dehumidification requirement and the environment temperature T2 is less than a preset temperature C2, controlling the air conditioner to operate in a primary refrigeration dehumidification mode;

detecting the environmental humidity H4 and the environmental temperature T5 of the cabinet, and judging whether the cabinet has a dehumidification requirement or not according to the environmental humidity H4;

when the cabinet has a dehumidification requirement, judging whether the duration time that the environmental humidity H4 is greater than the preset humidity S1 is greater than the preset time T2 or not, and whether the environmental temperature T5 is less than the preset temperature C5 or not;

when the cabinet has a dehumidification requirement and the duration that the ambient humidity H4 is greater than the preset humidity S1 is greater than the preset time T2, or when the cabinet has a dehumidification requirement and the ambient temperature T5 is less than the preset temperature C5, controlling the air conditioner to operate in a secondary refrigeration dehumidification mode;

detecting the environmental humidity H5 and the environmental temperature T6 of the cabinet, and judging whether the cabinet has a dehumidification requirement or not according to the environmental humidity H5;

when the cabinet has a dehumidification requirement, judging whether the duration of the environment humidity H5 which is greater than the preset humidity S2 is greater than the preset time T3 or not and whether the environment temperature T6 is less than the preset temperature C6 or not;

when the cabinet has a dehumidification demand and the duration that the ambient humidity H5 is greater than the preset humidity S2 is greater than the preset time T3, or when the cabinet has a dehumidification demand and the ambient temperature T6 is less than the preset temperature C6, the air conditioner is controlled to operate in a three-stage refrigeration dehumidification mode.

In one embodiment, after the step of detecting the ambient humidity H4 and the ambient temperature T5 of the cabinet and determining whether the cabinet has a dehumidification requirement according to the ambient humidity H4, the method further includes:

when the cabinet has a dehumidification requirement, judging whether the environment temperature T5 is less than a preset temperature C5;

when the cabinet has a dehumidification requirement and the environment temperature T5 is greater than or equal to the preset temperature C5, or when the cabinet has no dehumidification requirement, the air conditioner is controlled to operate in a pure refrigeration mode.

In one embodiment, after the steps of detecting an ambient temperature T1 of the cabinet and determining whether the ambient temperature T1 is greater than a preset temperature C1 when the air conditioner is in the air supply mode or the standby mode, the method further includes:

judging whether the ambient temperature T1 is less than a preset temperature C8;

when the ambient temperature T1 is less than the preset temperature C8, controlling the air conditioner to operate in a pure heating mode;

detecting the ambient temperature T8 and the ambient humidity H7 of the cabinet, judging whether the cabinet has a dehumidification requirement or not according to the ambient humidity H7, and judging whether the ambient temperature T8 is greater than a preset temperature C9 or not;

when the cabinet has no dehumidification requirement and the environment temperature T8 is greater than the preset temperature C9, controlling the air conditioner to operate in an air supply mode or a standby mode.

In one embodiment, after the steps of detecting the ambient temperature T8 and the ambient humidity H7 of the cabinet, determining whether the cabinet has a dehumidification requirement according to the ambient humidity H7, and determining whether the ambient temperature T8 is greater than a preset temperature C9, the method further includes:

judging whether the ambient temperature T8 is greater than the preset temperature C7;

when the dehumidification is needed and the environment temperature T8 is greater than the preset temperature C7, controlling the air conditioner to operate in a secondary heat compensation dehumidification mode.

In one embodiment, after the steps of detecting the ambient humidity H1 and the ambient temperature T2 of the cabinet, determining whether the cabinet has a dehumidification requirement according to the ambient humidity H1, and determining whether the ambient temperature T2 is less than a preset temperature C2, the method further includes:

judging whether the ambient temperature T2 is less than a preset temperature C1;

when the cabinet has no dehumidification requirement and the ambient temperature T2 is less than the preset temperature C1, controlling the air conditioner to operate in a thermal compensation cooling mode.

In one embodiment, after the step of detecting the ambient temperature T4 of the cabinet and determining whether the ambient temperature T4 is greater than the preset temperature C4, the method further includes:

judging whether the environment temperature T4 is less than an alarm temperature;

when the ambient temperature T4 is less than the warning temperature, the air conditioner is controlled to operate in a pure heating mode and the compressor is controlled to be stopped.

A controller comprising a memory and a processor;

wherein the memory is used for storing programs;

the processor is used for executing the program and realizing the steps of the temperature and humidity control method of the air conditioner.

An air conditioner comprises a compressor, an internal heat exchanger, an external heat exchanger, a throttling element, an internal radiator, an external radiator, a heater, a detection element and the controller; the compressor, the internal heat exchanger, the throttling element and the external heat exchanger are connected through pipelines to form refrigerant circulation, and the compressor, the throttling element, the internal radiator, the external radiator, the heater and the detection element are respectively and electrically connected with the controller.

A storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the temperature and humidity control method of an air conditioner as described above.

Drawings

Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present application;

fig. 2 is a flowchart illustrating a temperature and humidity control method of an air conditioner according to an embodiment of the present disclosure;

fig. 3 is a sub-flowchart of a temperature and humidity control method of an air conditioner according to an embodiment of the present application;

fig. 4 is a sub-flowchart of a temperature and humidity control method of an air conditioner according to an embodiment of the present application;

fig. 5 is a flowchart illustrating a temperature and humidity control method of an air conditioner according to an embodiment of the present disclosure;

fig. 6 is a flowchart illustrating a temperature and humidity control method of an air conditioner according to an embodiment of the present disclosure;

fig. 7 is a flowchart illustrating a temperature and humidity control method of an air conditioner according to an embodiment of the disclosure;

fig. 8 is a flowchart of a temperature and humidity control method of an air conditioner in an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the 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.

The machine room or the cabinet is usually provided with a large amount of equipment, the equipment can generate a large amount of heat in the working process, moisture can also appear in the machine room or the cabinet, and if the heat generated by the equipment and the moisture in the machine room or the cabinet are not removed in time, the equipment can be damaged. An air conditioner is generally adopted in an existing machine room or cabinet to cool and dehumidify the machine room or cabinet. The following embodiments of the present application are described with an air conditioner applied to a cabinet, and the air conditioner of the embodiments of the present application may also be applied to a machine room.

Referring to fig. 1, the air conditioner includes a compressor 10, an interior heat exchanger 20, an exterior heat exchanger 30, a throttling element 40, an interior radiator 50, an exterior radiator 60, a heater 70, a sensing element (not shown), and a controller 80. Wherein, the compressor 10, the inner heat exchanger 20, the throttling element 40, and the outer heat exchanger 30 are connected by pipes to form a refrigerant cycle, and the compressor 10, the throttling element 40, the inner radiator 50, the outer radiator 60, the heater 70, and the detection element are respectively electrically connected with the controller 80, so that the controller 80 controls the operation thereof.

Specifically, when the air conditioner operates in the cooling mode, the high-temperature and high-pressure gaseous refrigerant from the compressor 10 flows to the external heat exchanger 30, is changed into a high-temperature and high-pressure liquid refrigerant after heat exchange by the external heat exchanger 30, is changed into a low-temperature and low-pressure liquid refrigerant after throttling by the throttling element 40, is changed into a low-temperature and low-pressure gaseous refrigerant after heat exchange by the internal heat exchanger 20, and flows back to the compressor 10, so that a cooling cycle is completed.

The internal heat exchanger 20 is also called an evaporator. The external heat exchanger 30 is also called a condenser. The throttling element 40 may be an electronic expansion valve or a capillary tube. The internal heat sink 50 may be an internal fan. The external heat sink 60 may be an external fan. The heater 70 may be an electric heater 70 or a heating coil. The electric heater 70 and the heating coil may have the same heating effect. The sensing elements may include a first temperature sensor, a second temperature sensor, a third temperature sensor, a humidity sensor, and a pressure sensor. First temperature sensor sets up in air conditioner indoor side or inside the rack for detect the inside ambient temperature of rack. The second temperature sensor is disposed in the return pipe of the compressor 10, and is configured to detect a return temperature of the refrigerant. The third temperature sensor is disposed on the evaporator and is configured to detect a temperature of the refrigerant at the evaporator, which is also referred to as an evaporation temperature. The humidity sensor is arranged on the inner side of the air conditioner room or inside the cabinet and used for detecting the internal humidity of the cabinet. The pressure sensor is disposed in the return pipe of the compressor 10 for detecting the evaporation pressure of the refrigerant. Interior fan can be so that ambient temperature and humidity evenly distributed in the rack, consequently, the ambient temperature of the temperature of interior fan department is the same with in the rack.

In the following embodiments, the temperature and humidity control method of the air conditioner is described with the throttling element 40 as an electronic expansion valve, and in practical applications, the throttling element 40 may be a capillary tube.

Referring to fig. 2, an embodiment of the present application provides a temperature and humidity control method for an air conditioner, including the following steps:

and step S01, when the air conditioner is in the air supply mode or the standby mode, detecting the ambient temperature T1 of the cabinet and judging whether the ambient temperature T1 is greater than the preset temperature C1.

After the air conditioner is started, the air conditioner operates in an air supply mode or a standby mode. When the air conditioner operates in an air supply mode, the inner fan operates according to a preset rotating speed, the air output of the inner fan is a preset air output, and the preset air output is the lowest air output which can enable the temperature of the cabinet to be uniform. At this time, the compressor 10 is not operated, which is also called as the compressor 10 is turned off or stopped, the external fan is turned off, the heater 70 is turned off, and the electronic expansion valve is fully opened or fully closed.

The first temperature sensor detects an ambient temperature T1 of the cabinet and transmits the ambient temperature T1 to the controller 80, and the controller 80 determines whether the ambient temperature T1 is greater than a preset temperature C1. The preset temperature C1 is a cooling set temperature. In one implementation scenario, the preset temperature C1 may be 25 degrees celsius, for example, and in other implementation scenarios, the preset temperature C1 may be other temperatures. The temperature value of the ambient temperature T1 can be set according to actual needs.

And step S02, when the environmental temperature T1 is greater than the preset temperature C1, controlling the air conditioner to operate in a pure cooling mode.

When the ambient temperature T1 is greater than the preset temperature C1, that is, the ambient temperature T1 is greater than the refrigeration set temperature, the ambient temperature of the cabinet needs to be reduced, and the controller 80 controls the air conditioner to operate in the pure refrigeration mode.

When the air conditioner operates in the pure cooling mode, the controller 80 controls the inner fan to operate at a first rotation speed, controls the compressor 10 to operate at a first frequency, controls the opening degree of the electronic expansion valve to be a first opening degree, and closes the heater 70.

The controller 80 calculates a first rotating speed according to a difference value between the ambient temperature T1 and the preset temperature C1, and when the difference value between the ambient temperature T1 and the preset temperature C1 is large, it indicates that the refrigeration requirement of the cabinet is large, and the first rotating speed is large; when the difference between the ambient temperature T1 and the preset temperature C1 is smaller, it indicates that the cooling requirement of the cabinet is smaller, and the first rotation speed is smaller. The controller 80 controls the air output of the inner fan by controlling the rotating speed of the inner fan, so that the refrigeration requirement of the cabinet is met.

The controller 80 further calculates a first frequency according to a difference between the ambient temperature T1 and the preset temperature C1, and when the difference between the ambient temperature T1 and the preset temperature C1 is larger, it indicates that the refrigeration requirement of the cabinet is larger, and the first frequency is higher; when the difference between the ambient temperature T1 and the preset temperature C1 is smaller, it indicates that the cooling requirement of the cabinet is smaller, and the first frequency is lower. The controller 80 controls the power of the compressor 10 by controlling the operating frequency of the compressor 10, thereby satisfying the refrigeration requirement of the cabinet.

When the air conditioner operates in a pure refrigeration mode, the second temperature sensor detects a first return air temperature of the refrigerant, the pressure sensor detects a first evaporation pressure of the refrigerant, and the saturation temperature corresponding to the first evaporation pressure is the first saturation temperature. The controller 80 calculates a first superheat degree based on the first return air temperature and the first saturation temperature. The controller 80 also calculates a first opening degree based on the first degree of superheat. The controller 80 adjusts the valve opening of the electronic expansion valve to the first opening to meet the refrigeration requirement of the cabinet.

Step S03, detecting the ambient humidity H1 and the ambient temperature T2 of the cabinet, determining whether the cabinet has a dehumidification requirement according to the ambient humidity H1, and determining whether the ambient temperature T2 is less than a preset temperature C2.

When the air conditioner operates in the pure refrigeration mode, the air conditioner refrigerates the cabinet, the ambient temperature in the cabinet is reduced, the first temperature sensor detects the ambient temperature in the cabinet in real time, and the ambient temperature T2 is the ambient temperature in the cabinet detected by the first temperature sensor in the operation of the air conditioner in the pure refrigeration mode. In an implementation scenario, the preset temperature C2 may be, for example, 30 degrees celsius. In other implementations, the preset temperature C2 may be other temperatures. The temperature value of the ambient temperature T2 can be set according to actual needs.

The humidity sensor detects the ambient humidity in the cabinet in real time, and the ambient humidity H1 is the ambient humidity in the cabinet detected by the humidity sensor in the operation of the air conditioner in the pure refrigeration mode. The controller 80 compares the ambient humidity H1 with the predetermined demand humidity to determine whether the cabinet requires dehumidification.

And step S04, when the cabinet has a dehumidification demand and the ambient temperature T2 is less than the preset temperature C2, controlling the air conditioner to operate in a cooling and dehumidification mode.

When the air conditioner operates in a cooling and dehumidifying mode, the cabinet can be cooled and dehumidified with lower power consumption.

Referring to fig. 3, step S04 includes the following steps.

And step S41, when the cabinet has a dehumidification demand and the ambient temperature T2 is less than the preset temperature C2, controlling the air conditioner to operate in a primary refrigeration and dehumidification mode.

When the air conditioner operates in the primary cooling and dehumidifying mode, the controller 80 controls the inner fan to operate at the second rotation speed, controls the compressor 10 to operate at the second frequency, controls the opening degree of the electronic expansion valve to the second opening degree, and turns off the heater 70. At this time, the first temperature sensor detects the ambient temperature in the cabinet to obtain a first dew point temperature, the third sensor detects the temperature of the refrigerant at the evaporator to obtain a first evaporation temperature, the controller 80 calculates the difference between the first dew point temperature and the first evaporation temperature to obtain a first dew point temperature difference, and calculates a second rotating speed according to the first dew point temperature difference. When the difference value between the first dew point temperature difference and the preset dew point temperature difference is larger, the second rotating speed is larger; and when the difference value between the first dew point temperature difference and the preset dew point temperature difference is smaller, the second rotating speed is smaller. The controller 80 controls the air output of the inner fan by controlling the rotating speed of the inner fan, so that the refrigerating and dehumidifying requirements of the cabinet are met.

The controller 80 further calculates a second frequency according to the first dew point temperature difference, and when the difference between the first dew point temperature and the first evaporation temperature is larger, the larger the dehumidification requirement of the cabinet in a unit time under the same environmental condition is, the higher the second frequency is; when the difference between the first dew point temperature and the first evaporation temperature is smaller, the smaller the dehumidification requirement of the cabinet in the unit time under the same environmental condition is, and the smaller the second frequency is. In order to maintain the preset dew point temperature difference of the cabinet, the controller 80 controls the operating frequency of the compressor 10, and then controls the power of the compressor 10, so as to meet the dehumidification requirement of the cabinet.

When the air conditioner operates in the primary refrigeration and dehumidification mode, the second temperature sensor detects a second return air temperature of the refrigerant, the pressure sensor detects a second evaporation pressure of the refrigerant, and the saturation temperature corresponding to the second evaporation pressure is a second saturation temperature. The controller 80 calculates a second superheat degree based on the second return air temperature and the second saturation temperature. The controller 80 also calculates a second opening degree based on the second degree of superheat. The controller 80 adjusts the valve opening of the electronic expansion valve to a second opening to meet the refrigeration and dehumidification requirements of the cabinet.

And step S42, detecting the environmental humidity H4 and the environmental temperature T5 of the cabinet, and judging whether the cabinet has a dehumidification requirement or not according to the environmental humidity H4.

When the air conditioner operates in the primary refrigeration and dehumidification mode, the air conditioner performs refrigeration and dehumidification treatment on the cabinet. The first temperature sensor detects the ambient temperature in the cabinet in real time, and in this mode, the ambient temperature in the cabinet detected by the first temperature sensor is the ambient temperature T5. The humidity sensor detects the ambient humidity in the cabinet in real time, and in this mode, the ambient humidity in the cabinet detected by the first humidity sensor is the ambient humidity H4. The controller 80 compares the ambient humidity H4 with the predetermined demand humidity to determine whether the cabinet requires dehumidification.

Step S43, when the cabinet has a dehumidification demand, it is determined whether the duration of the environmental humidity H4 being greater than the preset humidity S1 is greater than the preset time T2 and the environmental temperature T5 is less than the preset temperature C5.

The values of the preset demanded humidity, the environmental humidity H4 and the preset humidity S1 can be expressed as relative humidity percentage, and in an implementation scenario, the preset demanded humidity can be, for example, 60%, and the preset humidity S1 can be, for example, 75%. The preset temperature C5 may be, for example, 28 degrees celsius. Of course, the preset demanded humidity, the preset humidity S1 and the preset temperature C5 may be other values.

Step S44, when there is a dehumidification demand and the duration that the ambient humidity H4 is greater than the preset humidity S1 is greater than the preset time T2, or when there is a dehumidification demand and the ambient temperature T5 is less than the preset temperature C5, controlling the air conditioner to operate in the secondary cooling and dehumidification mode.

When the air conditioner operates in the secondary cooling and dehumidifying mode, the controller 80 controls the inner fan to operate at the third rotation speed, controls the compressor 10 to operate at the third frequency, controls the opening degree of the electronic expansion valve to be the third opening degree, and closes the heater 70. At this time, the first temperature sensor detects the ambient temperature in the cabinet to obtain a second dew point temperature, the third sensor detects the temperature of the refrigerant at the evaporator to obtain a second evaporation temperature, the controller 80 calculates the difference between the second dew point temperature and the second evaporation temperature to obtain a second dew point temperature difference, and calculates a third rotating speed according to the second dew point temperature difference. When the difference value between the second dew point temperature difference and the preset dew point temperature difference is larger, the third rotating speed is larger; and when the difference value between the second dew point temperature difference and the preset dew point temperature difference is smaller, the third rotating speed is smaller. The controller 80 controls the air output of the inner fan by controlling the rotating speed of the inner fan, so that the refrigerating and dehumidifying requirements of the cabinet are met.

The controller 80 further calculates a third frequency according to the second dew point temperature difference, and when the difference between the second dew point temperature and the second evaporation temperature is larger, it indicates that the dehumidification requirement of the cabinet in a unit time under the same environmental condition is larger, and the third frequency is higher; when the difference between the second dew point temperature difference and the preset dew point temperature difference is smaller, it indicates that the dehumidification requirement of the cabinet in the unit time under the same environmental condition is smaller, and the third frequency is smaller. In order to maintain the preset dew point temperature difference of the cabinet, the controller 80 controls the operating frequency of the compressor 10, and then controls the power of the compressor 10, so as to meet the dehumidification requirement of the cabinet.

When the air conditioner operates in the secondary refrigeration and dehumidification mode, the second temperature sensor detects a third return air temperature of the refrigerant, the pressure sensor detects a third evaporation pressure of the refrigerant, and the saturation temperature corresponding to the third evaporation pressure is a third saturation temperature. The controller 80 calculates a third superheat degree from the third return air temperature and the third saturation temperature. The controller 80 also calculates a third opening degree based on the third superheat degree. The controller 80 adjusts the valve opening of the electronic expansion valve to a third opening to meet the refrigeration and dehumidification requirements of the cabinet.

And step S45, detecting the environmental humidity H5 and the environmental temperature T6 of the cabinet, and judging whether the cabinet has a dehumidification requirement or not according to the environmental humidity H5.

When the air conditioner operates in the secondary refrigeration and dehumidification mode, the air conditioner performs further refrigeration and dehumidification treatment on the cabinet. The first temperature sensor detects the ambient temperature in the cabinet in real time, and in this mode, the ambient temperature in the cabinet detected by the first temperature sensor is the ambient temperature T6. The humidity sensor detects the ambient humidity in the cabinet in real time, and in this mode, the ambient humidity in the cabinet detected by the first humidity sensor is the ambient humidity H5. The controller 80 compares the ambient humidity H5 with the predetermined demand humidity to determine whether the cabinet requires dehumidification.

Step S46, when the cabinet has a dehumidification demand, it is determined whether the duration of the environmental humidity H5 being greater than the preset humidity S2 is greater than the preset time T3 and the environmental temperature T6 is less than the preset temperature C6.

The ambient humidity H5 and the predetermined humidity S2 may be expressed as a percentage of relative humidity, and in one implementation scenario, the predetermined humidity S2 may be 65%, for example. The preset temperature C6 may be, for example, 26 degrees celsius. Of course, the preset humidity S2 and the preset temperature C6 may be other values.

And step S47, when the cabinet has a dehumidification demand and the duration that the environmental humidity H5 is greater than the preset humidity S2 is greater than the preset time T3, or when the cabinet has a dehumidification demand and the environmental temperature T6 is less than the preset temperature C6, controlling the air conditioner to operate in a three-stage refrigeration dehumidification mode.

When the air conditioner operates in the three-stage cooling and dehumidifying mode, the controller 80 controls the inner fan to operate at the fourth rotation speed, controls the compressor 10 to operate at the fourth frequency, controls the opening degree of the electronic expansion valve to be the fourth opening degree, and closes the heater 70. At this time, the first temperature sensor detects the ambient temperature in the cabinet to obtain a third dew point temperature, the third sensor detects the temperature of the refrigerant at the evaporator to obtain a third evaporation temperature, the controller 80 calculates the difference between the third dew point temperature and the third evaporation temperature to obtain a third dew point temperature difference, and calculates a fourth rotating speed according to the third dew point temperature difference. When the difference value between the third dew point temperature difference and the preset dew point temperature difference is larger, the fourth rotating speed is larger; and when the difference value between the third dew point temperature difference and the preset dew point temperature difference is smaller, the fourth rotating speed is smaller. The controller 80 controls the air output of the inner fan by controlling the rotating speed of the inner fan, so that the refrigerating and dehumidifying requirements of the cabinet are met.

The controller 80 further calculates a fourth frequency according to the third dew point temperature difference, and when the difference between the third dew point temperature and the third evaporation temperature is larger, it indicates that the dehumidification requirement of the cabinet in a unit time under the same environmental condition is larger, and the fourth frequency is higher; when the difference between the third dew point temperature and the third evaporation temperature is smaller, the smaller the dehumidification requirement of the cabinet in a unit time under the same environmental condition is, and the smaller the fourth frequency is. In order to maintain the preset dew point temperature difference of the cabinet, the controller 80 controls the operating frequency of the compressor 10, and then controls the power of the compressor 10, so as to meet the refrigeration and dehumidification requirements of the cabinet.

When the air conditioner operates in the three-stage refrigeration and dehumidification mode, the second temperature sensor detects a fourth return air temperature of the refrigerant, the pressure sensor detects a fourth evaporation pressure of the refrigerant, and a saturation temperature corresponding to the fourth evaporation pressure is a fourth saturation temperature. The controller 80 calculates a fourth superheat degree from the fourth return air temperature and the fourth saturation temperature. The controller 80 also calculates a fourth opening degree based on the fourth degree of superheat. The controller 80 adjusts the valve opening of the electronic expansion valve to the fourth opening to meet the refrigeration and dehumidification requirements of the cabinet.

In the above-mentioned first-stage refrigeration dehumidification mode, second-stage refrigeration dehumidification mode, and third-stage refrigeration dehumidification mode, the refrigeration dehumidification capacity of the second-stage refrigeration dehumidification mode may be greater than the refrigeration dehumidification capacities of the first-stage refrigeration dehumidification mode and the third-stage refrigeration dehumidification mode, and the power consumption of the second-stage refrigeration dehumidification mode may be greater than the power consumption of the first-stage refrigeration dehumidification mode and the third-stage refrigeration dehumidification mode. The refrigeration dehumidification capacity of the first-stage refrigeration dehumidification mode is greater than that of the third-stage refrigeration dehumidification mode, and the power consumption of the first-stage refrigeration dehumidification mode is greater than that of the third-stage refrigeration dehumidification mode. In the above-mentioned one-stage refrigeration dehumidification mode, the second-stage refrigeration dehumidification mode and the third-stage refrigeration dehumidification mode, it may also be that the refrigeration dehumidification capacity of the second-stage refrigeration dehumidification mode is greater than that of the one-stage refrigeration dehumidification mode, and the refrigeration dehumidification capacity of the third-stage refrigeration dehumidification mode is greater than that of the second-stage refrigeration dehumidification mode, or the refrigeration dehumidification capacities of the one-stage refrigeration dehumidification mode, the second-stage refrigeration dehumidification mode and the third-stage refrigeration dehumidification mode are gradually increased, or the refrigeration dehumidification capacities of the one-stage refrigeration dehumidification mode, the second-stage refrigeration dehumidification mode and the third-stage refrigeration dehumidification mode are gradually decreased. The user can set the refrigeration and dehumidification capacity of the primary refrigeration and dehumidification mode, the secondary refrigeration and dehumidification mode and the tertiary refrigeration and dehumidification mode correspondingly according to the actual refrigeration and dehumidification demand, and the method is not limited to the above mode.

When the air conditioner runs in a pure refrigeration mode, the humidity in the cabinet is increased, the air conditioner is firstly controlled to be switched to a primary refrigeration dehumidification mode, the cabinet can be effectively dehumidified, the humidity of the cabinet can be smoothly reduced, and excessive dehumidification or excessive refrigeration temperature drop adjustment is avoided. When the air conditioner operates in the primary refrigeration dehumidification mode, if the cabinet still has a dehumidification demand, the air conditioner is controlled to be switched to the secondary refrigeration dehumidification mode, the processing capacity of the cabinet humidity can be improved, and the cabinet humidity is reduced. When the air conditioner runs for a period of time in the secondary refrigeration dehumidification mode, if the cabinet still has a dehumidification requirement, the humidity of the cabinet is low at the moment, the air conditioner is controlled to be switched to the tertiary refrigeration dehumidification mode, the dehumidification of the air conditioner is ensured, the power consumption of the air conditioner is reduced, and the air conditioner is favorably switched to the thermal compensation dehumidification mode under the condition that the cabinet still has the dehumidification requirement. By dividing the refrigeration dehumidification mode into three refrigeration dehumidification modes, the air conditioner can perform refrigeration dehumidification with low power consumption, and the temperature and humidity balance of the cabinet is maintained. In other embodiments, the cooling and dehumidifying modes are not limited to be divided into three cooling and dehumidifying modes, and may be four, five or other numbers of cooling and dehumidifying modes, which are not limited herein.

Step S45 is followed by the step of:

and when the cabinet has no dehumidification requirement and the time of the cabinet having no dehumidification requirement is greater than the preset time t11, controlling the air conditioner to operate in a primary refrigeration dehumidification mode.

The preset time t11 may be 1 minute or other time.

Step S05, detecting the ambient humidity H2 and the ambient temperature T3 of the cabinet, determining whether the cabinet has a dehumidification requirement according to the ambient humidity H2, and determining whether the ambient temperature T3 is less than a preset temperature C3.

When the air conditioner operates in the refrigeration and dehumidification mode, the air conditioner performs refrigeration and dehumidification on the cabinet, the ambient temperature in the cabinet is reduced, the first temperature sensor detects the ambient temperature in the cabinet in real time, and the ambient temperature T3 is the ambient temperature in the cabinet detected by the first temperature sensor in the operation of the air conditioner in the refrigeration and dehumidification mode. In an implementation scenario, the preset temperature C3 may be, for example, 16 degrees celsius or 12 degrees celsius. In other implementations, the preset temperature C3 may be other temperatures.

The humidity sensor detects the ambient humidity in the cabinet in real time, and the ambient humidity H2 is the ambient humidity in the cabinet detected by the humidity sensor when the air conditioner operates in a cooling and dehumidifying mode. The controller 80 compares the ambient humidity H2 with the predetermined demand humidity to determine whether the cabinet requires dehumidification.

Step S05 is followed by the step of:

and when the cabinet has no dehumidification requirement and the time of the cabinet having no dehumidification requirement is greater than the preset time t12, controlling the air conditioner to operate in a secondary refrigeration dehumidification mode.

The preset time t12 may be 1 minute or other time.

And step S06, when the cabinet has a dehumidification demand and the ambient temperature T3 is less than the preset temperature C3, controlling the air conditioner to operate in a thermal compensation dehumidification mode.

When the air conditioner operates in a thermal compensation dehumidification mode, the falling speed of the internal environment temperature of the cabinet can be reduced, the cabinet can be dehumidified, the environment temperature and the environment humidity of the cabinet can be considered simultaneously, and the uncoordinated treatment of the environment temperature and the environment humidity of the cabinet is avoided.

Referring to fig. 4, specifically, the step S06 includes the following steps.

And step S61, when the cabinet has a dehumidification demand and the ambient temperature T3 is less than the preset temperature C3, controlling the air conditioner to operate in a primary thermal compensation dehumidification mode.

When the air conditioner operates in the first-stage thermal compensation dehumidification mode, the controller 80 controls the inner fan to operate at a fifth rotation speed, controls the compressor 10 to operate at a fifth frequency, controls the opening degree of the electronic expansion valve to be a fifth opening degree, and turns on the heater 70. At this time, the first temperature sensor detects the ambient temperature in the cabinet to obtain a fourth dew point temperature, the third sensor detects the temperature of the refrigerant at the evaporator to obtain a fourth evaporation temperature, the controller 80 calculates the difference between the fourth dew point temperature and the fourth evaporation temperature to obtain a fourth dew point temperature difference, and calculates a fifth rotation speed according to the fourth dew point temperature difference. When the difference value between the fourth dew point temperature difference and the preset dew point temperature difference is large, the fifth rotating speed is large; and when the difference value between the fourth dew point temperature difference and the preset dew point temperature difference is smaller, the fifth rotating speed is smaller. The controller 80 controls the air output of the inner fan by controlling the rotating speed of the inner fan, so that the refrigerating and dehumidifying requirements of the cabinet are met.

The controller 80 further calculates a fifth frequency according to the fourth dew point temperature difference, and when the difference between the fourth dew point temperature and the fourth evaporation temperature is larger, it indicates that the dehumidification requirement of the cabinet in a unit time under the same environmental condition is larger, and the fifth frequency is higher; when the difference between the fourth dew point temperature and the fourth evaporation temperature is smaller, the smaller the dehumidification requirement of the cabinet in the unit time under the same environmental condition is, and the smaller the fifth frequency is. In order to maintain the preset dew point temperature difference of the cabinet, the controller 80 controls the operating frequency of the compressor 10, and then controls the power of the compressor 10, so as to meet the refrigeration and dehumidification requirements of the cabinet.

Before the air conditioner is switched to the first-stage thermal compensation dehumidification mode, the controller 80 controls the compressor 10 to operate at the fifth frequency and then controls the heater 70 to be turned on. Because the compressor 10 needs to go through a buffering time to refrigerate when the operation frequency changes, and the heater 70 can be heated up immediately after being started, the compressor 10 is controlled to operate at the fifth frequency first, and then the heater 70 is controlled to be started, so that the rapid rise of the cabinet environment temperature can be avoided, and the stability of the cabinet environment temperature can be maintained.

When the air conditioner operates in the primary heat compensation dehumidification mode, the second temperature sensor detects a fifth return air temperature of the refrigerant, the pressure sensor detects a fifth evaporation pressure of the refrigerant, and a saturation temperature corresponding to the fifth evaporation pressure is a fifth saturation temperature. The controller 80 calculates a fifth superheat degree from the fifth return air temperature and the fifth saturation temperature. The controller 80 also calculates a fifth opening degree based on the fifth superheat degree. The controller 80 adjusts the valve opening of the electronic expansion valve to a fifth opening to meet the refrigeration and dehumidification requirements of the cabinet.

And step S62, detecting the environmental humidity H6 and the environmental temperature T7 of the cabinet, and judging whether the cabinet has a dehumidification requirement or not according to the environmental humidity H6.

When the air conditioner operates in the primary thermal compensation dehumidification mode, the air conditioner performs thermal compensation dehumidification treatment on the cabinet. The first temperature sensor detects the ambient temperature in the cabinet in real time, and in this mode, the ambient temperature in the cabinet detected by the first temperature sensor is the ambient temperature T7. The humidity sensor detects the ambient humidity in the cabinet in real time, and in this mode, the ambient humidity in the cabinet detected by the first humidity sensor is the ambient humidity H6. The controller 80 compares the ambient humidity H6 with the predetermined demand humidity to determine whether the cabinet requires dehumidification.

Step S63, when the cabinet has a dehumidification demand, determine whether the ambient temperature T7 is greater than the preset temperature C7, or, when the cabinet has no dehumidification demand, determine whether the duration of the cabinet without the dehumidification demand is greater than the preset time T4.

In one implementation scenario, the predetermined temperature C7 may be, for example, 26 degrees celsius. The preset time t4 is 1 minute or other time. The preset temperature C7 may also be other temperatures.

Step S64, when the cabinet has a dehumidification demand, the ambient temperature T7 is greater than the preset temperature C7, or when the cabinet has no dehumidification demand, the duration of the cabinet without dehumidification demand is less than the preset time T4, and the air conditioner is controlled to operate in the secondary thermal compensation dehumidification mode.

When the air conditioner operates in the two-stage thermal compensation dehumidification mode, the controller 80 controls the inner fan to operate at a sixth rotation speed, controls the compressor 10 to operate at a sixth frequency, controls the opening degree of the electronic expansion valve to be a sixth opening degree, and turns on the heater 70. At this time, the first temperature sensor detects the ambient temperature in the cabinet to obtain a fifth dew point temperature, the third sensor detects the temperature of the refrigerant at the evaporator to obtain a fifth evaporation temperature, the controller 80 calculates the difference between the fifth dew point temperature and the fifth evaporation temperature to obtain a fifth dew point temperature difference, and calculates a sixth rotating speed according to the fifth dew point temperature difference. When the difference value between the fifth dew point temperature difference and the preset dew point temperature difference is large, the sixth rotating speed is large; and when the difference value between the fifth dew point temperature difference and the preset dew point temperature difference is smaller, the sixth rotating speed is smaller. The controller 80 controls the air output of the inner fan by controlling the rotating speed of the inner fan, so that the refrigerating and dehumidifying requirements of the cabinet are met.

The controller 80 further calculates a sixth frequency according to the fifth dew point temperature difference, and when the difference between the fifth dew point temperature and the fifth evaporation temperature is larger, the larger the dehumidification requirement of the cabinet in the same environmental condition in a unit time is, the higher the sixth frequency is; when the difference between the fifth dew point temperature and the fifth evaporation temperature is smaller, the smaller the dehumidification requirement of the cabinet in the unit time under the same environmental condition is, and the smaller the sixth frequency is. In order to maintain the preset dew point temperature difference of the cabinet, the controller 80 controls the operating frequency of the compressor 10, and then controls the power of the compressor 10, so as to meet the refrigeration and dehumidification requirements of the cabinet.

Before the air conditioner is switched to the second-stage heat compensation dehumidification mode, the controller 80 controls the compressor 10 to operate at the sixth frequency, and then controls the heater 70 to be turned on. Because the compressor 10 needs to go through a buffering time to refrigerate when the operation frequency changes, and the heater 70 can be heated up immediately after being started, the compressor 10 is controlled to operate at the sixth frequency first, and then the heater 70 is controlled to be started, so that the rapid rise of the cabinet environment temperature can be avoided, and the stability of the cabinet environment temperature can be maintained.

When the air conditioner operates in the two-stage heat compensation dehumidification mode, the second temperature sensor detects a sixth return air temperature of the refrigerant, the pressure sensor detects a sixth evaporation pressure of the refrigerant, and a saturation temperature corresponding to the sixth evaporation pressure is a sixth saturation temperature. The controller 80 calculates a sixth superheat degree from the sixth return air temperature and the sixth saturation temperature. The controller 80 also calculates a sixth opening degree based on the sixth superheat degree. The controller 80 adjusts the valve opening of the electronic expansion valve to a sixth opening to meet the refrigeration and dehumidification requirements of the cabinet.

In the above-mentioned first-stage thermal compensation dehumidification mode and the second-stage thermal compensation dehumidification mode, the refrigeration dehumidification capacity of the first-stage thermal compensation dehumidification mode is smaller than that of the second-stage thermal compensation dehumidification mode, and the power consumption of the first-stage thermal compensation dehumidification mode is smaller than that of the second-stage thermal compensation dehumidification mode. Through dividing into two thermal compensation dehumidification modes with the thermal compensation dehumidification mode, can make the air conditioner because carry out the dehumidification and make the temperature that the rack descends to the rack, can compensate the temperature that the rack descends through the heating, avoid the rack to be less than the alarm temperature, because the heating of air conditioner offsets with the refrigeration moreover, can realize the full load of air conditioner and adjust. The minimum heating amount of the air conditioner in the heat compensation dehumidification mode may be greater than or equal to the minimum cooling amount.

And step S07, detecting the environmental humidity H3 of the cabinet and judging whether the cabinet has a dehumidification requirement according to the environmental humidity H3.

When the air conditioner operates in the thermal compensation dehumidification mode, the air conditioner performs thermal compensation dehumidification treatment on the cabinet. The humidity sensor detects the ambient humidity in the cabinet in real time, and the ambient humidity H3 is the ambient humidity in the cabinet detected by the humidity sensor when the air conditioner operates in the thermal compensation dehumidification mode. The controller 80 compares the ambient humidity H3 with the predetermined demand humidity to determine whether the cabinet requires dehumidification.

And step S08, controlling the air conditioner to operate in a thermal compensation cooling mode when the cabinet has no dehumidification requirement.

When the air conditioner operates in the thermal compensation cooling mode, the controller 80 controls the inner fan to operate at a seventh rotational speed, controls the compressor 10 to operate at a seventh frequency, controls the opening degree of the electronic expansion valve to be a seventh opening degree, and turns on the heater 70.

The seventh rotational speed is a rated rotational speed corresponding to the thermal compensation cooling mode, and when the air conditioner enters the thermal compensation cooling mode, the controller 80 controls the operation of the inner fan at the seventh rotational speed.

The controller 80 calculates a seventh frequency according to a difference value between the ambient temperature of the cabinet detected by the first temperature sensor in the thermal compensation dehumidification mode and the preset temperature C1, and when the difference value between the ambient temperature of the cabinet detected by the first temperature sensor in the thermal compensation dehumidification mode and the preset temperature C1 is larger, the refrigeration requirement of the cabinet is larger, and the seventh frequency is higher; when the difference between the ambient temperature of the cabinet detected by the first temperature sensor in the thermal compensation dehumidification mode and the preset temperature C1 is small, it indicates that the cooling demand of the cabinet is small, and the seventh frequency is low. The controller 80 controls the power of the compressor 10 by controlling the operating frequency of the compressor 10, thereby satisfying the refrigeration requirement of the cabinet.

When the air conditioner operates in the thermal compensation cooling mode, the second temperature sensor detects a seventh return air temperature of the refrigerant, the pressure sensor detects a seventh evaporation pressure of the refrigerant, and the saturation temperature corresponding to the seventh evaporation pressure is a seventh saturation temperature. The controller 80 calculates a seventh superheat degree from the seventh return air temperature and the seventh saturation temperature. The controller 80 also calculates a seventh opening degree based on the seventh superheat degree. The controller 80 adjusts the valve opening of the electronic expansion valve to a seventh opening to meet the refrigeration requirement of the cabinet.

Further, when the duration time of the cabinet without the dehumidification requirement is greater than the preset time t1, the air conditioner is controlled to operate in the thermal compensation cooling mode.

The preset time t1 may be 1 minute or other time.

It should be noted that the air conditioner also has a certain dehumidification effect when operating in the thermal compensation cooling mode.

Step S09, detecting an ambient temperature T4 of the cabinet, and determining whether the ambient temperature T4 is greater than a preset temperature C4.

When the air conditioner operates in the thermal compensation refrigeration mode, the air conditioner performs thermal compensation refrigeration treatment on the cabinet. The temperature sensor detects the ambient temperature in the cabinet in real time, and the ambient temperature T4 is the ambient temperature in the cabinet detected by the temperature sensor during the operation of the air conditioner in the thermal compensation cooling mode. The preset temperature C4 may be 23 to 27 degrees celsius.

And step S10, when the environmental temperature T4 is greater than the preset temperature C4, controlling the air conditioner to operate in a pure cooling mode.

When the ambient temperature T4 is greater than the preset temperature C4, the controller 80 controls the air conditioner to return to the pure cooling mode operation.

Referring to fig. 5, in one embodiment, the step S03 is followed by the steps of:

in step S031, it is determined whether the ambient temperature T2 is less than a preset temperature C1.

Step S032, when the cabinet has no dehumidification requirement and the ambient temperature T2 is lower than the preset temperature C1, controlling the air conditioner to operate in the thermal compensation cooling mode.

When the air conditioner is in a pure refrigeration mode, when the cabinet has no dehumidification requirement and the ambient temperature T2 is less than the preset temperature C1, the air conditioner is controlled to operate in a thermal compensation refrigeration mode, so that the air conditioner only refrigerates the cabinet, and the power consumption of the air conditioner is saved.

Referring to fig. 6, in one embodiment, after step S42, the method further includes:

in step S421, when the cabinet has a dehumidification demand, it is determined whether the ambient temperature T5 is less than the preset temperature C5.

Step S422, when the cabinet has a dehumidification demand and the ambient temperature T5 is greater than or equal to the preset temperature C5, or when the cabinet has no dehumidification demand, the air conditioner is controlled to operate in a pure refrigeration mode.

Referring to fig. 7, in one embodiment, after step S44, the method further includes:

in step S441, the ambient temperature T9 of the cabinet is detected.

In step S442, it is determined whether the ambient temperature T9 is less than or equal to the preset temperature C7.

In step S443, when the cabinet has a dehumidification demand and the ambient temperature T9 is less than or equal to the preset temperature C7, the air conditioner is controlled to operate in the primary thermal compensation dehumidification mode.

It will be appreciated that the controller 80 determines whether there is a dehumidification demand for the cabinet based on the sensed ambient humidity H3 of the cabinet when the humidity sensor is operating in the two-stage thermally compensated dehumidification mode.

The humidity sensor detects the cabinet ambient humidity H3, i.e., the ambient humidity of the cabinet when the air conditioner is operating in the two-stage thermally compensated dehumidification mode.

In one embodiment, step S442 is followed by:

step S445, when the cabinet has a dehumidification demand and the ambient temperature T9 is greater than the preset temperature C5, controlling the air conditioner to operate in the primary refrigeration and dehumidification mode.

In one embodiment, step S09 is followed by:

judging whether the ambient temperature T4 is less than the alarm temperature;

when the ambient temperature T4 is less than the warning temperature, the air conditioner is controlled to operate in the pure heating mode and the compressor 10 is controlled to be stopped.

In the normal operation of the air conditioner, the ambient temperature of the cabinet is higher than the alarm temperature, but when the air conditioner fails, if the heater 70 fails to heat, the ambient temperature of the cabinet is lower than the alarm temperature, and at this time, the compressor 10 needs to be controlled to stop for maintenance, and the air conditioner is controlled to operate in the pure heating mode to temporarily slow down the falling speed of the temperature in the cabinet. The alarm temperature may be, for example, 15 degrees celsius. Of course, the alarm temperature may also be set to other temperatures as desired.

Referring to fig. 8, in one embodiment, after step S01, the method further includes the following steps:

in step S101, it is determined whether the ambient temperature T1 is less than the preset temperature C8.

The preset temperature C8 is a heating set temperature, and the preset temperature C8 may be 10 to 15 degrees celsius or other temperatures.

And S102, when the ambient temperature T1 is less than the preset temperature C8, controlling the air conditioner to operate in a pure heating mode.

When the ambient temperature T1 is less than the preset temperature C8, that is, the ambient temperature T1 is greater than the heating set temperature, the ambient temperature of the cabinet needs to be raised, and the controller 80 controls the air conditioner to operate in the pure heating mode.

When the air conditioner operates in the pure heating mode, the controller 80 controls the inner fan to operate at the eighth rotating speed, controls the compressor 10 to be closed, controls the outer fan to be closed, controls the electronic expansion valve to be fully opened or fully closed, and controls the heater 70 to be opened.

The controller 80 calculates an eighth rotation speed according to a difference between the ambient temperature T1 and the preset temperature C8, and when the difference between the ambient temperature T1 and the preset temperature C8 is large, it indicates that the heating requirement of the cabinet is large, and the eighth rotation speed is large; when the difference between the ambient temperature T1 and the preset temperature C8 is smaller, it indicates that the heating requirement of the cabinet is smaller, and the eighth rotation speed is smaller. The controller 80 controls the air output of the inner fan by controlling the rotating speed of the inner fan, so that the heating requirement of the cabinet is met.

Step S103, detecting the ambient temperature T8 and the ambient humidity H7 of the cabinet, and judging whether the cabinet has a dehumidification requirement or not and whether the ambient temperature T8 is greater than a preset temperature C9 or not according to the ambient humidity H7.

The first temperature sensor detects the ambient temperature T8 of the cabinet and the humidity sensor detects the ambient humidity H7 of the cabinet. The ambient temperature T8 is the ambient temperature inside the cabinet that the first temperature sensor detects when the air conditioner is in the pure heating mode. The ambient humidity H7 is the ambient humidity within the cabinet that the humidity sensor detects when the air conditioner is in the pure heating mode.

And step S104, when the cabinet has no dehumidification requirement and the ambient temperature T8 is greater than the preset temperature C9, controlling the air conditioner to operate in an air supply mode or a standby mode.

When the cabinet has no dehumidification demand and the ambient temperature T8 is greater than the preset temperature C9, the controller 80 controls the air conditioner to return to the air supply mode or the standby mode for operation.

The preset temperature C9 is a temperature at which the heater 70 stops heating when the air conditioner is operated in the pure heating mode. The preset temperature C9 may be 23 to 25 degrees celsius or other temperature range.

In one embodiment, the following steps are further included after step S103:

in step S201, it is determined whether the ambient temperature T8 is greater than the preset temperature C7.

Step S202, when there is a dehumidification demand and the ambient temperature T8 is greater than the preset temperature C7, the air conditioner is controlled to operate in the secondary heat compensation dehumidification mode.

When the air conditioner operates in a pure heating mode, if the ambient temperature and humidity of the cabinet are too high, the cabinet needs to be refrigerated and dehumidified, and the air conditioner is controlled to be switched from the pure heating mode to a secondary thermal compensation dehumidification mode, so that the refrigerating capacity and the dehumidifying capacity of the air conditioner are smooth and excessive, and the phenomena of overshoot and regulation hysteresis of the air conditioner on the temperature and humidity of the cabinet are avoided.

It should be noted that the controller 80 may calculate the temperature by using a PID algorithm as follows:

wherein, K is the number of measurements, u (K) is the calculated deviation value, e (K) is the deviation value between the measurement result corresponding to the number of measurements and the set value, Kp is the proportional coefficient, Ki is the integral coefficient, Kd is the derivative coefficient, and the controller 80 finds the optimum stable temperature corresponding to the air conditioner by adjusting Kp, Ki, Kd, and the three coefficients (respectively, the proportional coefficient, the integral coefficient, and the derivative coefficient).

In the above embodiment, the opening degree of the electronic expansion valve corresponds to the degree of superheat, and the controller 80 may adjust the electronic expansion valve according to the degree of superheat. The first to seventh opening degrees may be one of opening degree ranges of the electronic expansion valve, and when the electronic expansion valve has any one of the first to seventh opening degrees, the controller 80 controls the electronic expansion valve not to close in the one opening degree range corresponding to the first to seventh opening degrees.

The above-mentioned ambient temperatures T1 to T9 may be the above-mentioned exemplary temperature values, and may be other temperature values. The above-mentioned ambient humidity H1-ambient humidity H8 may be the humidity values exemplified above, or may be other humidity values.

The temperature and humidity control method of the air conditioner comprises the steps of setting an air supply mode or a standby mode of the air conditioner, a pure refrigeration mode, a refrigeration dehumidification mode and a thermal compensation refrigeration mode, so that the size of cabinet ambient temperature and humidity can be determined, selecting the mode of the air conditioner, when the temperature of the cabinet is reduced due to dehumidification, adopting the thermal compensation mode, avoiding the continuous reduction of the temperature, realizing full-load adjustment of refrigeration and dehumidification of the air conditioner, ensuring the low-power-consumption non-stop operation of the air conditioner, and coping with the change of the cabinet ambient temperature and the humidity.

The controller 80 includes a memory for storing a program and a processor for executing the program, so as to implement the steps of the temperature and humidity control method of the air conditioner.

The embodiment of the present application further provides a storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps of the temperature and humidity control method for an air conditioner are implemented.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A temperature and humidity control method of an air conditioner is characterized by comprising the following steps:

detecting the ambient temperature T4 of the cabinet, and judging whether the ambient temperature T4 is greater than a preset temperature C4;

and when the ambient temperature T4 is greater than the preset temperature C4, controlling the air conditioner to operate in a pure cooling mode.

2. The method for controlling temperature and humidity of an air conditioner according to claim 1, wherein after the step of controlling the air conditioner to operate in a cooling and dehumidifying mode when the cabinet requires dehumidification and the ambient temperature T2 is less than the preset temperature C2, the method further comprises:

detecting the ambient humidity H2 and the ambient temperature T3 of the cabinet, judging whether the cabinet has a dehumidification requirement or not according to the ambient humidity H2, and judging whether the ambient temperature T3 is less than a preset temperature C3 or not;

3. The method as claimed in claim 2, wherein the step of controlling the air conditioner to operate in the thermal compensation dehumidification mode when the cabinet requires dehumidification and the ambient temperature T3 is less than the preset temperature C3 comprises:

when the cabinet has a dehumidification demand, judging whether the environment temperature T7 is greater than a preset temperature C7 or whether the duration time of the cabinet without the dehumidification demand is greater than a preset time T4 or not;

when the cabinet has the dehumidification demand, ambient temperature T7 is greater than preset temperature C7, perhaps, when the cabinet does not have the dehumidification demand, the duration that the cabinet does not have the dehumidification demand is less than preset time T4, controls the air conditioner is with the operation of second grade thermal compensation dehumidification mode.

4. The temperature and humidity control method of claim 3, wherein when the cabinet has a dehumidification demand, the ambient temperature T7 is greater than the preset temperature C7, or when the cabinet has no dehumidification demand, the duration of the cabinet without dehumidification demand is less than the preset time T4, and after the step of controlling the air conditioner to operate in the two-stage thermal compensation dehumidification mode, the method further comprises:

detecting the ambient temperature T9 of the cabinet;

5. The temperature and humidity control method of an air conditioner according to claim 4, wherein after the step of determining whether the ambient temperature T9 is less than or equal to a preset temperature C7, the method further comprises:

6. The method for controlling the temperature and humidity of an air conditioner according to claim 1, wherein the step of controlling the air conditioner to operate in a thermal compensation cooling mode when the cabinet has no dehumidification demand further comprises:

and when the duration time of the cabinet without the dehumidification requirement is longer than the preset time t1, controlling the air conditioner to operate in a thermal compensation cooling mode.

7. The temperature and humidity control method of an air conditioner according to claim 1, wherein the step of controlling the air conditioner to operate in a cooling and dehumidifying mode when the cabinet requires dehumidification and the ambient temperature T2 is less than a preset temperature C2 includes:

when the cabinet has a dehumidification requirement, judging whether the duration of the environment humidity H5 greater than the preset humidity S2 is greater than the preset time T3 and whether the environment temperature T6 is less than the preset temperature C6;

8. The method of claim 7, wherein after the steps of detecting the humidity H4 and the temperature T5 of the cabinet and determining whether the cabinet requires dehumidification according to the humidity H4, the method further comprises:

9. The method for controlling temperature and humidity of an air conditioner according to claim 1, wherein after the steps of detecting an ambient temperature T1 of a cabinet and determining whether the ambient temperature T1 is greater than a preset temperature C1 when the air conditioner is in an air supply mode or a standby mode, the method further comprises:

10. The temperature and humidity control method of an air conditioner according to claim 9, wherein after the steps of detecting an ambient temperature T8 and an ambient humidity H7 of the cabinet, determining whether the cabinet has a dehumidification requirement according to the ambient humidity H7, and determining whether the ambient temperature T8 is greater than a preset temperature C9, the method further comprises:

11. The method of claim 1, wherein after the steps of detecting an ambient humidity H1 and an ambient temperature T2 of the cabinet, determining whether the cabinet requires dehumidification according to the ambient humidity H1, and determining whether the ambient temperature T2 is lower than a preset temperature C2, the method further comprises:

12. The temperature and humidity control method of an air conditioner according to claim 1, after the step of detecting an ambient temperature T4 of the cabinet and determining whether the ambient temperature T4 is greater than a preset temperature C4, further comprising:

13. A controller comprising a memory and a processor;

wherein the memory is used for storing programs;

the processor is configured to execute the program and implement the steps of the temperature and humidity control method of the air conditioner according to any one of claims 1 to 12.

14. An air conditioner comprising a compressor, an internal heat exchanger, an external heat exchanger, a throttling element, an internal radiator, an external radiator, a heater, a sensing element and the controller of claim 13; the compressor, the internal heat exchanger, the throttling element and the external heat exchanger are connected through pipelines to form refrigerant circulation, and the compressor, the throttling element, the internal radiator, the external radiator, the heater and the detection element are respectively and electrically connected with the controller.

15. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the temperature and humidity control method of an air conditioner according to any one of claims 1 to 12.