Air conditioning system and control method

Abstract

The application discloses an air conditioning system and a control method, and belongs to the air conditioning field. The air conditioning system comprises a compressor, a condenser, a first expansion valve, an evaporator, a refrigerant pump, a second expansion valve, an air-cooled evaporative heat exchanger and a controller. The compressor is connected with the condenser. The condenser is connected with the first expansion valve. The first expansion valve is connected with the evaporator. The evaporator is connected with the compressor. The first end of the refrigerant pump is connected between the first expansion valve and the evaporator and communicates with the first expansion valve. The second end of the refrigerant pump is connected with the second expansion valve. The second expansion valve is connected with the air-cooled evaporative heat exchanger. The air-cooled evaporative heat exchanger is connected with the compressor. The refrigerant pump and the second expansion valve are electrically connected with the controller.

Description

Technical Field

[0001] This application belongs to the field of air conditioning, specifically relating to an air conditioning system and control method. Background Technology

[0002] With the development of technology, air conditioning is becoming increasingly widespread, especially in high-temperature environments where it is indispensable. Typically, an air conditioning system consists of a compressor, condenser, expansion valve, and evaporator. The compressor compresses the refrigerant, which then enters the condenser. From there, the refrigerant is transferred to the expansion valve, and then through the expansion valve into the evaporator. The evaporator has an inlet and an outlet. Cooling water enters the evaporator through the inlet, exchanges heat with the refrigerant, and then flows out through the outlet. The outlet connects to a fan coil unit, which then exchanges heat with the environment, lowering the ambient temperature. The refrigerant then re-enters the compressor. In this process, the refrigerant circulates through the compressor, condenser, expansion valve, and evaporator. However, in practical applications, in addition to requirements for ambient temperature, users usually also have requirements for ambient humidity and fresh air. However, in related technologies, when ambient humidity, fresh air and temperature are all provided by cooling water heat exchange, poor regulation effect is likely to occur. For example, the temperature meets the requirements but the ambient humidity is too high, or the ambient humidity meets the requirements but the temperature is too low. Summary of the Invention

[0003] The purpose of this application is to provide an air conditioning system and control method that at least solves the problem of poor regulation effect when the ambient humidity, fresh air and temperature are all provided by cooling water heat exchange.

[0004] In a first aspect, embodiments of this application provide an air conditioning system, which includes: a compressor, a condenser, a first expansion valve, an evaporator, a refrigerant pump, a second expansion valve, an air-cooled evaporative heat exchanger, and a controller;

[0005] The compressor is connected to the condenser, the condenser is connected to the first expansion valve, the first expansion valve is connected to the evaporator, the evaporator is connected to the compressor, the first end of the refrigerant pump is connected between the first expansion valve and the evaporator and communicates with the first expansion valve, the second end of the refrigerant pump is connected to the second expansion valve, the second expansion valve is connected to the air-cooled evaporative heat exchanger, the air-cooled evaporative heat exchanger is connected to the compressor, and both the refrigerant pump and the second expansion valve are electrically connected to the controller.

[0006] The evaporator has an inlet, an outlet, a refrigerant inlet, and a refrigerant outlet. The inlet is used to inject cooling water into the evaporator. The outlet is connected to a fan coil unit and is used to transfer the cooling water from the evaporator to the fan coil unit, so that the fan coil unit lowers the temperature of the environment where the air conditioning system is located. The first expansion valve is connected to the refrigerant inlet, and the compressor is connected to the refrigerant outlet. The compressor is used to compress the refrigerant so that the refrigerant flows to the condenser, from the condenser to the first expansion valve, and from the first expansion valve to the refrigerant pump and the refrigerant inlet. The refrigerant also flows from the refrigerant outlet to the compressor, forming a refrigerant circulation. The refrigerant pump is used to pump the refrigerant to the second expansion valve so that the refrigerant flows through the second expansion valve to the air-cooled evaporative heat exchanger. The air-cooled evaporative heat exchanger lowers the temperature of the environment where the air conditioning system is located and transfers the refrigerant to the compressor.

[0007] Optionally, the air conditioning system further includes a gas-liquid separator, a control valve, and a fourth temperature sensor;

[0008] The first end of the gas-liquid separator is connected to the air-cooled evaporative heat exchanger, the second end of the gas-liquid separator is connected to the control valve, and the control valve is connected to the compressor. The third end of the gas-liquid separator is connected to the compressor. The control valve is electrically connected to the controller, and the controller is used to control the opening or closing of the control valve.

[0009] The fourth temperature sensor is electrically connected to the controller and is located between the gas-liquid separator and the control valve. The fourth temperature sensor is used to detect the gaseous temperature of the refrigerant flowing out of the gas-liquid separator and send the gaseous temperature to the controller.

[0010] Optionally, the air conditioning system further includes a first temperature sensor, a second temperature sensor, a third temperature sensor, and a humidity sensor;

[0011] The first temperature sensor, the second temperature sensor, the third temperature sensor, and the humidity sensor are all electrically connected to the controller;

[0012] The first temperature sensor is located at the air outlet of the air-cooled evaporative heat exchanger. The first temperature sensor is used to detect the air outlet temperature of the air-cooled evaporative heat exchanger and send the air outlet temperature to the controller.

[0013] The second temperature sensor is used to detect the ambient temperature of the environment in which the air conditioning system is located, and sends the ambient temperature to the controller;

[0014] The third temperature sensor is installed at the water outlet and is used to detect the water temperature at the water outlet and send the water temperature to the controller.

[0015] The humidity sensor is used to detect the ambient humidity of the environment in which the air conditioning system is located, and sends the ambient humidity to the controller.

[0016] Secondly, embodiments of this application provide a control method applied to the air conditioning system described in any one of the first aspects above, the control method comprising:

[0017] Determine the operating mode of the air conditioning system, the operating mode including fresh air mode and dehumidification mode;

[0018] When the air conditioning system is in fresh air mode, the second expansion valve is controlled to open to the first opening degree, and the refrigerant pump is controlled to run at full load. The first outlet air temperature of the air-cooled evaporative heat exchanger is obtained, and the opening degree of the second expansion valve is adjusted according to the first outlet air temperature, and the operating load of the refrigerant pump is adjusted.

[0019] When the air conditioning system is in dehumidification mode, the second expansion valve is controlled to open to the second opening degree, and the refrigerant pump is controlled to run at full load. The second outlet air temperature of the air-cooled evaporative heat exchanger is obtained, and the opening degree of the second expansion valve is adjusted according to the second outlet air temperature, wherein the first opening degree is greater than the second opening degree.

[0020] Optionally, adjusting the opening of the second expansion valve and the operating load of the refrigerant pump according to the first outlet air temperature includes:

[0021] Determine the difference between the first outlet air temperature and the first preset temperature;

[0022] If the first outlet air temperature is less than or equal to the first preset temperature, the operating load of the refrigerant pump is reduced until the first outlet air temperature is greater than the first preset temperature but less than the second preset temperature, and the second preset temperature is greater than the first preset temperature.

[0023] If the first outlet air temperature is greater than the first preset temperature, the magnitude of the first outlet air temperature and the second preset temperature is determined. If the first outlet air temperature is less than the second preset temperature, the refrigerant pump is not controlled so that the refrigerant pump operates according to the current operating load. If the first outlet air temperature is greater than or equal to the second preset temperature, the opening of the second expansion valve is reduced until the first outlet air temperature is greater than the first preset temperature and less than the second preset temperature.

[0024] Optionally, when reducing the operating load of the refrigerant pump, the operating load of the refrigerant pump is detected. If the operating load of the refrigerant pump is equal to the preset operating load, the reduction of the operating load of the refrigerant pump is stopped.

[0025] When the opening of the second expansion valve is reduced, the opening of the second expansion valve is detected. If the opening of the second expansion valve is equal to the preset opening, the reduction of the opening of the second expansion valve is stopped.

[0026] Optionally, the air conditioning system further includes a first temperature sensor, a second temperature sensor, a third temperature sensor, and a humidity sensor, wherein adjusting the opening of the second expansion valve according to the second outlet air temperature includes:

[0027] The ambient temperature and humidity of the environment in which the air conditioning system is located are obtained, and the dew point temperature of the environment in which the air conditioning system is located is determined based on the ambient temperature and humidity.

[0028] Determine the relative values ​​of the second outlet air temperature and the dew point temperature;

[0029] If the second outlet air temperature is greater than the dew point temperature, adjust the opening of the second expansion valve to reduce the opening of the second expansion valve until the second outlet air temperature is less than or equal to the dew point temperature.

[0030] If the second outlet air temperature is less than or equal to the dew point temperature, the magnitude of the second outlet air temperature and the third preset temperature is determined, where the third preset temperature is less than the dew point temperature. If the second outlet air temperature is greater than or equal to the third preset temperature, the second expansion valve is not controlled to maintain its current opening. If the second outlet air temperature is less than the third preset temperature, the opening of the second expansion valve is adjusted to increase its opening until the second outlet air temperature is greater than or equal to the third preset temperature and less than or equal to the dew point temperature.

[0031] Optionally, the control method further includes:

[0032] Determine the rate of temperature change of the environment in which the air conditioning system is located;

[0033] If the temperature change rate is greater than a preset temperature change rate, determine whether the controller has received a control signal (sent by the remote control of the air conditioning system), or determine whether the temperature at the water outlet is lower than a preset temperature value. If the controller receives the control signal, or the temperature at the water outlet is lower than the preset temperature value, then the refrigerant pump is not controlled so that it operates according to the current operating load. If the controller does not receive a control signal, and the temperature at the water outlet is greater than or equal to the preset temperature value, then the operating load of the refrigerant pump is adjusted to reduce the operating load until the temperature change rate is less than or equal to the preset temperature change rate.

[0034] If the temperature change rate is less than or equal to the preset temperature change rate, the refrigerant pump will not be controlled so that the refrigerant pump operates according to the current operating load.

[0035] Optionally, the control method further includes:

[0036] Obtain the ambient humidity of the environment in which the air conditioning system is located;

[0037] If the ambient humidity is less than or equal to the preset humidity, then control of the refrigerant pump and the second expansion valve shall be stopped.

[0038] Optionally, the air conditioning system further includes a gas-liquid separator, a control valve, and a fourth temperature sensor, and the control method further includes:

[0039] Obtain the gaseous temperature of the refrigerant flowing out of the gas-liquid separator;

[0040] When the gaseous temperature is greater than or equal to a preset gaseous temperature, the control valve is controlled to be in the open state;

[0041] When the gaseous temperature is lower than the preset gaseous temperature, the control valve is controlled to be in the closed state.

[0042] In this embodiment, since the compressor is connected to the condenser, the condenser is connected to the first expansion valve, the first expansion valve is connected to the evaporator, and the evaporator is connected to the compressor, the compressor can compress the refrigerant. The compressed refrigerant then enters the condenser, flows through the condenser into the first expansion valve, and then flows from the first expansion valve into the evaporator. The evaporator has a water inlet, a water outlet, a refrigerant inlet, and a refrigerant outlet. The first expansion valve is connected to the refrigerant inlet, and the compressor is connected to the refrigerant outlet. Thus, the refrigerant flowing through the first expansion valve can flow into the evaporator and from the refrigerant outlet into the compressor. Cooling water can be injected into the evaporator through the water inlet, and the water outlet is connected to the fan coil unit. The water outlet can then transfer the cooling water after heat exchange between the evaporator and the refrigerant to the fan coil unit, allowing the fan coil unit to lower the ambient temperature of the air conditioning system. Furthermore, in this process, a refrigerant circulation is formed, and the fan coil unit acts as a water-cooled device, lowering the ambient temperature. Since the first end of the refrigerant pump is connected between the first expansion valve and the evaporator, and is in communication with the first expansion valve, while the second end of the refrigerant pump is connected to the second expansion valve, which in turn is connected to the air-cooled evaporative heat exchanger, which is connected to the compressor, after flowing through the first expansion valve, the refrigerant pump can be controlled by the controller. This causes a portion of the refrigerant flowing from the first expansion valve to flow into the evaporator, while the remaining refrigerant flows to the refrigerant pump and then into the second expansion valve. After flowing out of the second expansion valve, the refrigerant flows into the air-cooled evaporative heat exchanger. The air-cooled evaporative heat exchanger can draw in gas. After the gas exchanges heat with the refrigerant, the gas temperature drops, and the cooled gas then flows out of the air-cooled evaporative heat exchanger. The air flowing out of the outlet enters the environment where the air conditioning system is located, causing the ambient temperature to drop. Furthermore, once the air flowing out of the outlet of the air-cooled evaporative heat exchanger enters the environment where the air conditioning system is located, it is equivalent to changing the gas composition of that environment, essentially injecting new gas into the environment. This is equivalent to introducing fresh air into the environment through the air-cooled evaporative heat exchanger. Additionally, the lower temperature of the environment caused by the air flowing out of the outlet of the air-cooled evaporative heat exchanger can cause moisture in the air to condense, reducing the humidity level and thus dehumidifying the environment.In other words, in this embodiment, by setting up a refrigerant pump, a second expansion valve, an air-cooled evaporative heat exchanger, and a controller, with the controller electrically connected to both the refrigerant pump and the second expansion valve, the cooling water flowing from the evaporator outlet can be directed to the fan coil unit to adjust the temperature of the environment where the air conditioning system is located. The controller controls the refrigerant pump and the second expansion valve, allowing the refrigerant to flow into the air-cooled evaporative heat exchanger. This allows the air-cooled evaporative heat exchanger to regulate the humidity and fresh air intake of the environment. In this embodiment, the ambient humidity and fresh air intake are regulated by the air-cooled evaporative heat exchanger, while the ambient temperature is regulated by the fan coil unit. This separate adjustment of the ambient humidity, fresh air intake, and temperature results in better regulation and improves the user experience. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of one of the air conditioning systems provided in an embodiment of this application;

[0044] Figure 2 This is a second schematic diagram of an air conditioning system provided in an embodiment of this application;

[0045] Figure 3 A flowchart illustrating a control method provided in an embodiment of this application;

[0046] Figure 4 This is a schematic flowchart illustrating one of the control methods provided in an embodiment of this application;

[0047] Figure 5 This is a second flowchart illustrating a control method provided in an embodiment of this application.

[0048] Figure label:

[0049] 001: Fan coil unit; 10: Compressor; 20: Condenser; 30: First expansion valve; 40: Evaporator; 41: Water inlet; 42: Water outlet; 43: Refrigerant inlet; 44: Refrigerant outlet; 50: Refrigerant pump; 60: Second expansion valve; 70: Air-cooled evaporative heat exchanger; 80: Controller; 90: Gas-liquid separator; 100: Control valve; 110: Fourth temperature sensor; 120: First temperature sensor; 130: Second temperature sensor; 140: Third temperature sensor; 150: Humidity sensor. Detailed Implementation

[0050] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0051] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] Reference Figure 1 This illustration shows one of the schematic diagrams of an air conditioning system provided in an embodiment of this application; see reference to Figure 2 The diagram shows a second schematic representation of an air conditioning system according to an embodiment of this application. Figure 1 and Figure 2 As shown, the air conditioning system includes: compressor 10, condenser 20, first expansion valve 30, evaporator 40, refrigerant pump 50, second expansion valve 60, air-cooled evaporative heat exchanger 70, and controller 80.

[0054] Compressor 10 is connected to condenser 20, condenser 20 is connected to first expansion valve 30, first expansion valve 30 is connected to evaporator 40, evaporator 40 is connected to compressor 10, the first end of refrigerant pump 50 is connected between first expansion valve 30 and evaporator 40 and communicates with first expansion valve 30, the second end of refrigerant pump 50 is connected to second expansion valve 60, second expansion valve 60 is connected to air-cooled evaporative heat exchanger 70, air-cooled evaporative heat exchanger 70 is connected to compressor 10, and refrigerant pump 50 and second expansion valve 60 are both electrically connected to controller 80. The evaporator 40 has an inlet 41, an outlet 42, a refrigerant inlet 43, and a refrigerant outlet 44. The inlet 41 is used to inject cooling water into the evaporator 40. The outlet 42 is connected to the fan coil unit 001 and is used to transfer the cooling water in the evaporator 40 to the fan coil unit 001 so that the fan coil unit 001 can lower the ambient temperature of the air conditioning system. The first expansion valve 30 is connected to the refrigerant inlet 43, and the compressor 10 is connected to the refrigerant outlet 44. The compressor 10 is used to compress refrigerant. The refrigerant flows to the condenser 20, from the condenser 20 to the first expansion valve 30, and from the first expansion valve 30 to the refrigerant pump 50 and the refrigerant inlet 43, and from the refrigerant outlet 44 to the compressor 10, forming a refrigerant circulation. The refrigerant pump 50 is used to pump the refrigerant to the second expansion valve 60, so that the refrigerant flows through the second expansion valve 60 to the air-cooled evaporative heat exchanger 70. The air-cooled evaporative heat exchanger 70 reduces the temperature of the environment in which the air conditioning system is located, and the air-cooled heat exchanger transfers the refrigerant to the compressor 10.

[0055] In this embodiment, since the compressor 10 is connected to the condenser 20, the condenser 20 is connected to the first expansion valve 30, the first expansion valve 30 is connected to the evaporator 40, and the evaporator 40 is connected to the compressor 10, the compressor 10 can compress the refrigerant. The compressed refrigerant then enters the condenser 20, flows through the condenser 20 into the first expansion valve 30, and then flows from the first expansion valve 30 into the evaporator 40. The evaporator 40 has a water inlet 41, a water outlet 42, a refrigerant inlet 43, and a refrigerant outlet 44. A first expansion valve 30 is connected to the refrigerant inlet 43, and the compressor 10 is connected to the refrigerant outlet 44. Refrigerant flowing through the first expansion valve 30 can flow into the evaporator 40 and from the refrigerant outlet 44 to the compressor 10. Cooling water can be injected into the evaporator 40 through the water inlet 41. The water outlet 42 is connected to the fan coil unit 001, which transfers the cooling water from the evaporator 40 after heat exchange with the refrigerant to the fan coil unit 001, thereby lowering the ambient temperature of the air conditioning system. In this process, a refrigerant circulation is formed, and the fan coil unit 001 acts as a water-cooled device, reducing the ambient temperature. Since the first end of the refrigerant pump 50 is connected between the first expansion valve 30 and the evaporator 40, and communicates with the first expansion valve 30, and the second end of the refrigerant pump 50 is connected to the second expansion valve 60, which is connected to the air-cooled evaporative heat exchanger 70, which is connected to the compressor 10, after flowing through the first expansion valve 30, the refrigerant pump 50 can be controlled to operate by the controller 80. This causes a portion of the refrigerant flowing out of the first expansion valve 30 to flow into the evaporator 40, while the other portion flows to the refrigerant pump 50 and then into the second expansion valve 60. After flowing out of the second expansion valve 60, the refrigerant flows into the air-cooled evaporative heat exchanger 70. The air-cooled evaporative heat exchanger 70 can draw in gas. After the gas exchanges heat with the refrigerant, the gas temperature drops, and the temperature decreases. The cooled air flows out from the outlet of the air-cooled evaporative heat exchanger 40 and into the environment where the air conditioning system is located, causing the ambient temperature to drop. Once the air flowing out from the outlet of the air-cooled evaporative heat exchanger 40 enters the environment where the air conditioning system is located, it is equivalent to changing the gas in the environment, that is, injecting new gas into the environment, which is equivalent to bringing fresh air into the environment through the air-cooled evaporative heat exchanger 70. In addition, once the air flowing out from the outlet of the air-cooled evaporative heat exchanger 40 enters the environment where the air conditioning system is located, the temperature of the environment drops, which can cause the moisture in the air in the environment to condense, reducing the moisture in the environment, that is, adjusting the humidity of the environment, which is equivalent to adjusting the humidity of the environment through the air-cooled evaporative heat exchanger 70, thus dehumidifying the environment.In other words, in this embodiment, by setting up a refrigerant pump 50, a second expansion valve 60, an air-cooled evaporative heat exchanger 70, and a controller 80, with the controller 80 electrically connected to both the refrigerant pump 50 and the second expansion valve 60, the cooling water flowing from the outlet 42 of the evaporator 40 can reach the fan coil unit 001 in practical applications, thereby adjusting the temperature of the environment where the air conditioning system is located. The controller 80 controls the refrigerant pump 50 and the second expansion valve 60, allowing the refrigerant to flow into the air-cooled evaporative heat exchanger 70. Thus, the air-cooled evaporative heat exchanger 70 can regulate the humidity and fresh air of the environment. In this embodiment, the ambient humidity and fresh air are regulated by the air-cooled evaporative heat exchanger 70, while the ambient temperature is regulated by the fan coil unit 001. This separate adjustment of the ambient humidity, fresh air, and temperature results in better regulation and improves the user experience.

[0056] It should be noted that in the embodiments of this application, the condenser 20 can be a finned condenser 20. Of course, the condenser 20 can also be other types of condensers 20. In this regard, the embodiments of this application do not limit it.

[0057] In addition, in this embodiment, the air-cooled evaporative heat exchanger 70 has an air inlet and an air outlet. During operation, air from outside the environment where the air conditioning system is located flows into the air-cooled evaporative heat exchanger 70 through the air inlet, and refrigerant also enters the air-cooled evaporative heat exchanger 70. The refrigerant exchanges heat with the gas in the air-cooled evaporative heat exchanger 70, resulting in a lower temperature for the gas flowing out of the air outlet. Once the gas flowing out of the air outlet enters the environment where the air conditioning system is located, it can have a certain impact on the temperature of that environment, causing it to decrease. Consequently, the moisture in the air in that environment will condense, reducing the humidity of the environment, which is equivalent to dehumidifying the environment. Furthermore, the gas flowing out of the air outlet, after entering the environment, is equivalent to injecting fresh gas into the environment, bringing fresh air into the environment. That is, in this embodiment, the air conditioning system is equivalent to having a fresh air mode and a dehumidification mode. Regardless of whether the air conditioning system is in fresh air mode or dehumidification mode, the compressor 10 and evaporator 40 of the air conditioning system are operating normally. That is, the air conditioning system can normally cool the environment by sending cooling water out of the outlet 42 of the evaporator 40 to the fan coil unit 001.

[0058] In addition, in this embodiment, the compressor 10 and the condenser 20 can be connected by a pipe, the condenser 20 and the first expansion valve 30 can also be connected by a pipe, and the first expansion valve 30 and the evaporator 40 can also be connected by a pipe. An opening can be made in the pipe between the first expansion valve 30 and the evaporator 40, and one end of the refrigerant pump 50 can be connected to the opening through a pipe, so that the refrigerant flowing out of the first expansion valve 30 can flow into the pipe and then into the evaporator 40 and the refrigerant pump 50. Furthermore, the refrigerant pump 50 can also be connected to the second expansion valve 60 through a pipe, the second expansion valve 60 can also be connected to the liquid-cooled evaporative heat exchanger through a pipe, and the liquid-cooled evaporative heat exchanger can be connected to the compressor 10 through a pipe.

[0059] In some embodiments, the air conditioning system may also include a gas-liquid separator 90, a control valve 100, and a fourth temperature sensor 110. A first end of the gas-liquid separator 90 is connected to an air-cooled evaporative heat exchanger 70, a second end of the gas-liquid separator 90 is connected to the control valve 100, and the control valve 100 is connected to the compressor 10. A third end of the gas-liquid separator 90 is connected to the compressor 10. The control valve 100 is electrically connected to a controller 80, which controls the opening and closing of the control valve 100. The fourth temperature sensor 110 is electrically connected to the controller 80 and is located between the gas-liquid separator 90 and the control valve 100. The fourth temperature sensor 110 detects the gaseous temperature of the refrigerant flowing out of the gas-liquid separator 90 and sends the gaseous temperature to the controller 80.

[0060] Since the first end of the gas-liquid separator 90 is connected to the air-cooled evaporative heat exchanger 70, the second end of the gas-liquid separator 90 is connected to the control valve 100, and the control valve 100 is connected to the compressor 10, and the third end of the gas-liquid separator 90 is connected to the compressor 10, the refrigerant flowing out of the air-cooled evaporative heat exchanger 70 can flow into the gas-liquid separator 90. The gas-liquid separator 90 separates the refrigerant into gaseous and liquid states, allowing the gaseous refrigerant to flow into the compressor 10 and preventing the liquid refrigerant from flowing into the compressor 10, which could cause the compressor 10 to malfunction. The control valve 100 is electrically connected to the controller 80. Therefore, the controller 80 can control the control valve 100, causing it to open or close. When the control valve 100 is open, a portion of the gaseous refrigerant flowing from the gas-liquid separator 90 can flow through the control valve 100, while the other portion flows directly into the compressor 10. The gaseous refrigerant flowing through the control valve 100 into the compressor 10 effectively replenishes the compressor 10, increasing its output capacity. Furthermore, the fourth temperature sensor 110 is located between the gas-liquid separator 90 and the control valve 100. This sensor can detect the gaseous temperature of the refrigerant flowing from the gas-liquid separator 90 and send this temperature to the controller 80, allowing the controller 80 to determine whether to open the control valve 100 based on this temperature.

[0061] In some embodiments, the air conditioning system may also include a first temperature sensor 120, a second temperature sensor 130, a third temperature sensor 140, and a humidity sensor 150. The first temperature sensor 120, second temperature sensor 130, third temperature sensor 140, and humidity sensor 150 are all electrically connected to the controller 80. The first temperature sensor 120 is located at the air outlet of the air-cooled evaporative heat exchanger 70 and is used to detect the outlet air temperature of the air-cooled evaporative heat exchanger 70 and send the outlet air temperature to the controller 80. The second temperature sensor 130 is used to detect the ambient temperature of the environment in which the air conditioning system is located and sends the ambient temperature to the controller 80. The third temperature sensor 140 is installed at the water outlet 42 and is used to detect the outlet water temperature at the water outlet 42 and send the outlet water temperature to the controller 80. The humidity sensor 150 is used to detect the ambient humidity of the environment in which the air conditioning system is located and sends the ambient humidity to the controller 80.

[0062] By setting a first temperature sensor 120, the first temperature sensor 120 can detect the outlet air temperature of the air-cooled evaporative heat exchanger 70 and send this outlet air temperature to the controller 80. The controller 80 can then obtain the outlet air temperature of the air-cooled evaporative heat exchanger 70 and control the refrigerant pump 50 and / or the second expansion valve 60 accordingly. Additionally, by setting a second temperature sensor 130, the second temperature sensor 130 can detect the ambient temperature of the environment in which the air conditioning system is located and send this ambient temperature to the controller 80. The controller 80 can then obtain the ambient temperature of the environment in which the air conditioning system is located and control the refrigerant pump 50 and / or the second expansion valve 60 accordingly. Furthermore, by setting a third temperature sensor 140, the third temperature sensor 140 can detect the outlet water temperature at the outlet 42 of the evaporator 40 and send this outlet water temperature to the controller 80, allowing the controller 80 to control the refrigerant pump 50 and / or the second expansion valve 60 accordingly. In addition, by setting a humidity sensor 150, the humidity sensor 150 can detect the ambient humidity of the environment in which the air conditioning system is located and send the ambient humidity to the controller 80, so that the controller 80 can control the refrigerant pump 50 and / or the second expansion valve 60 according to the ambient humidity.

[0063] It should be noted that the second temperature sensor 130 can be installed in the environment where the air conditioning system is located, and the humidity sensor 150 can also be installed in the environment where the air conditioning system is located.

[0064] In addition, in this embodiment of the application, the air conditioning system may also include a carbon dioxide detector, which is used to detect the carbon dioxide content in the environment where the air conditioning system is located, and send the carbon dioxide content to the controller 80. The controller 80 can then control the refrigerant pump 50 and / or the second expansion valve 60 according to the carbon dioxide content, so as to whether the air conditioning system is in fresh air mode.

[0065] In this embodiment, since the compressor 10 is connected to the condenser 20, the condenser 20 is connected to the first expansion valve 30, the first expansion valve 30 is connected to the evaporator 40, and the evaporator 40 is connected to the compressor 10, the compressor 10 can compress the refrigerant. The compressed refrigerant then enters the condenser 20, flows through the condenser 20 into the first expansion valve 30, and then flows from the first expansion valve 30 into the evaporator 40. The evaporator 40 has a water inlet 41, a water outlet 42, a refrigerant inlet 43, and a refrigerant outlet 44. A first expansion valve 30 is connected to the refrigerant inlet 43, and the compressor 10 is connected to the refrigerant outlet 44. Refrigerant flowing through the first expansion valve 30 can flow into the evaporator 40 and from the refrigerant outlet 44 to the compressor 10. Cooling water can be injected into the evaporator 40 through the water inlet 41. The water outlet 42 is connected to the fan coil unit 001, which transfers the cooling water from the evaporator 40 after heat exchange with the refrigerant to the fan coil unit 001, thereby lowering the ambient temperature of the air conditioning system. In this process, a refrigerant circulation is formed, and the fan coil unit 001 acts as a water-cooled device, reducing the ambient temperature. Since the first end of the refrigerant pump 50 is connected between the first expansion valve 30 and the evaporator 40, and communicates with the first expansion valve 30, and the second end of the refrigerant pump 50 is connected to the second expansion valve 60, which is connected to the air-cooled evaporative heat exchanger 70, which is connected to the compressor 10, after flowing through the first expansion valve 30, the refrigerant pump 50 can be controlled to operate by the controller 80. This causes a portion of the refrigerant flowing out of the first expansion valve 30 to flow into the evaporator 40, while the other portion flows to the refrigerant pump 50 and then into the second expansion valve 60. After flowing out of the second expansion valve 60, the refrigerant flows into the air-cooled evaporative heat exchanger 70. The air-cooled evaporative heat exchanger 70 can draw in gas. After the gas exchanges heat with the refrigerant, the gas temperature drops, and the temperature decreases. The cooled air flows out from the outlet of the air-cooled evaporative heat exchanger 40 and into the environment where the air conditioning system is located, causing the ambient temperature to drop. Once the air flowing out from the outlet of the air-cooled evaporative heat exchanger 40 enters the environment where the air conditioning system is located, it is equivalent to changing the gas in the environment, that is, injecting new gas into the environment, which is equivalent to bringing fresh air into the environment through the air-cooled evaporative heat exchanger 70. In addition, once the air flowing out from the outlet of the air-cooled evaporative heat exchanger 40 enters the environment where the air conditioning system is located, the temperature of the environment drops, which can cause the moisture in the air in the environment to condense, reducing the moisture in the environment, that is, adjusting the humidity of the environment, which is equivalent to adjusting the humidity of the environment through the air-cooled evaporative heat exchanger 70, thus dehumidifying the environment.In other words, in this embodiment, by setting up a refrigerant pump 50, a second expansion valve 60, an air-cooled evaporative heat exchanger 70, and a controller 80, with the controller 80 electrically connected to both the refrigerant pump 50 and the second expansion valve 60, the cooling water flowing from the outlet 42 of the evaporator 40 can reach the fan coil unit 001 in practical applications, thereby adjusting the temperature of the environment where the air conditioning system is located. The controller 80 controls the refrigerant pump 50 and the second expansion valve 60, allowing the refrigerant to flow into the air-cooled evaporative heat exchanger 70. Thus, the air-cooled evaporative heat exchanger 70 can regulate the humidity and fresh air of the environment. In this embodiment, the ambient humidity and fresh air are regulated by the air-cooled evaporative heat exchanger 70, while the ambient temperature is regulated by the fan coil unit 001. This separate adjustment of the ambient humidity, fresh air, and temperature results in better regulation and improves the user experience.

[0066] Reference Figure 3 The diagram illustrates a flowchart of a control method provided in an embodiment of this application. This control method is applied to an air conditioning system in any of the above embodiments, such as... Figure 3 As shown, the control method is applied to the controller of an air conditioning system, and the control method includes:

[0067] Step S1: Determine the operating mode of the air conditioning system, which includes fresh air mode and dehumidification mode.

[0068] The air conditioning system may include a carbon dioxide sensor electrically connected to a controller. The sensor detects the carbon dioxide content of the environment in which the air conditioning system operates and sends this information to the controller. The controller then compares this carbon dioxide content with a preset threshold. If the carbon dioxide content exceeds the threshold, it indicates a high level of carbon dioxide in the environment. In this case, the air conditioning system needs to be in fresh air mode, meaning fresh air needs to be injected into the environment to reduce the carbon dioxide content. In other words, the controller can determine whether the air conditioning system is in fresh air mode based on the ambient carbon dioxide content. Alternatively, if the controller receives a control signal (sent by the air conditioning system's remote control), it indicates that the user has activated the fresh air mode by pressing the remote control. Therefore, in this embodiment, the controller can determine whether the air conditioning system is in fresh air mode based on the ambient carbon dioxide content or by receiving a control signal.

[0069] Additionally, the air conditioning system may include a humidity sensor electrically connected to the controller. The humidity sensor detects the ambient humidity of the environment in which the air conditioning system is located and sends this humidity data to the controller. After receiving the humidity data, the controller compares it with a preset humidity threshold. If the humidity exceeds the preset threshold, it indicates that the ambient humidity is high, and the air conditioning system needs to enter dehumidification mode. This involves lowering the ambient temperature to cause condensation and reduce the humidity. In other words, the controller can determine whether the air conditioning system is in dehumidification mode based on the ambient humidity. Furthermore, if the controller receives a control signal (sent by the air conditioning system's remote control), it indicates that the user has activated the dehumidification mode by pressing the remote control. Therefore, in this embodiment, the controller can determine whether the air conditioning system is in dehumidification mode based on the ambient humidity or by receiving a control signal.

[0070] Step S2: When the air conditioning system is in fresh air mode, control the second expansion valve to open to the first opening degree, control the refrigerant pump to run at full load, obtain the first outlet air temperature of the air-cooled evaporative heat exchanger, adjust the opening degree of the second expansion valve according to the first outlet air temperature, and adjust the operating load of the refrigerant pump.

[0071] The air conditioning system includes a first temperature sensor, which can detect the first outlet air temperature of the air-cooled evaporative heat exchanger. The first temperature sensor can then send the first outlet air temperature to the controller, which can then obtain the first outlet air temperature of the air-cooled evaporative heat exchanger.

[0072] It should be noted that the first opening degree can be 100%, meaning the second expansion valve is fully open. Additionally, the refrigerant pump operates at full load, equivalent to operating at 100% power.

[0073] In some implementations, adjusting the opening of the second expansion valve and the operating load of the refrigerant pump based on the first outlet air temperature can be achieved by: determining the magnitude of the first outlet air temperature and the first preset temperature; if the first outlet air temperature is less than or equal to the first preset temperature, reducing the operating load of the refrigerant pump until the first outlet air temperature is greater than the first preset temperature but less than the second preset temperature, and the second preset temperature is greater than the first preset temperature; if the first outlet air temperature is greater than the first preset temperature, determining the magnitude of the first outlet air temperature and the second preset temperature; if the first outlet air temperature is less than the second preset temperature, not controlling the refrigerant pump to allow it to operate at the current operating load; if the first outlet air temperature is greater than or equal to the second preset temperature, reducing the opening of the second expansion valve until the first outlet air temperature is greater than the first preset temperature but less than the second preset temperature.

[0074] In practical applications, because the ambient temperature on the user side is affected by various factors, it cannot be guaranteed that the outlet air temperature will be completely identical to the ambient temperature. Therefore, controlling the outlet air temperature within a certain range above and below the ambient temperature can meet the demand for fresh air while ensuring that the fresh air does not interfere with the existing temperature field. Specifically, the first preset temperature can be the ambient temperature minus a first preset value, for example, such as... Figure 4 As shown, the ambient temperature is T. 环 The first preset temperature is T. 环 -A, where A can range from 0 to 3 degrees Celsius. The second preset temperature can be the ambient temperature plus a second preset value, for example... Figure 4 As shown, the ambient temperature is T. 环 The second preset temperature is T. 环 +B, where B can range from 0 degrees to 3 degrees.

[0075] In addition, during the process of reducing the operating load of the refrigerant pump, the first outlet air temperature is obtained in real time, and the magnitude of the first outlet air temperature and the first preset temperature are determined in real time. Once the first outlet air temperature is greater than the first preset temperature and less than the second preset temperature, the operation of the refrigerant pump is stopped.

[0076] Additionally, when reducing the opening of the second expansion valve, it can be reduced according to a preset ratio, for example, such as... Figure 4 As shown, when reducing the size of the second expansion valve, it is reduced proportionally to n, where n can range from 0.5% to 3%. Additionally, when reducing the size of the refrigerant pump, it can be reduced according to a preset ratio, for example, as... Figure 4 As shown, when reducing the refrigerant pump, the pump should be reduced proportionally by m, where m can range from 1% to 5%.

[0077] In addition, during the process of reducing the opening of the second expansion valve, the first outlet air temperature is acquired in real time, and the magnitude of the first outlet air temperature and the second preset temperature is determined in real time. Once the first outlet air temperature is greater than the first preset temperature and less than the second preset temperature, the reduction of the opening of the second expansion valve is stopped.

[0078] In addition, in some implementations, when reducing the operating load of the refrigerant pump, the operating load of the refrigerant pump is detected. If the operating load of the refrigerant pump is equal to the preset operating load, the reduction of the operating load of the refrigerant pump is stopped. When reducing the opening of the second expansion valve, the opening of the second expansion valve is detected. If the opening of the second expansion valve is equal to the preset opening, the reduction of the opening of the second expansion valve is stopped.

[0079] The preset operating load can be 20% of the refrigerant pump's full-load operating load. This means that when the refrigerant pump's operating load is reduced to 20% of its full-load, the reduction in the refrigerant pump's operating load stops, ensuring that refrigerant can continuously flow into the second expansion valve. At this point, regardless of whether the first outlet air temperature is less than or equal to the first preset temperature, the refrigerant pump's operating load will not be reduced further. Additionally, the preset opening degree can be 10% of the second expansion valve's opening degree when it is 100% open. This means that when the second expansion valve is closed to 10%, the reduction in the second expansion valve's opening degree stops, maintaining the second expansion valve's opening at 10%, ensuring that refrigerant can flow into the air-cooled evaporative heat exchanger. At this point, regardless of whether the first outlet air temperature is greater than the second preset temperature, the opening degree of the second expansion valve will not be reduced further.

[0080] Step S3: When the air conditioning system is in dehumidification mode, control the second expansion valve to open to the second opening degree, control the refrigerant pump to run at full load, and obtain the second outlet air temperature of the air-cooled evaporative heat exchanger. Adjust the opening degree of the second expansion valve according to the second outlet air temperature, wherein the first opening degree is greater than the second opening degree. The second opening degree can be 50%.

[0081] In addition, the air conditioning system may also include a first temperature sensor, a second temperature sensor, a third temperature sensor, and a humidity sensor. In some implementations, adjusting the opening of the second expansion valve based on the second outlet air temperature can be achieved by: acquiring the ambient temperature and humidity of the environment where the air conditioning system is located, and determining the dew point temperature of the environment where the air conditioning system is located based on the ambient temperature and humidity; determining the magnitude of the second outlet air temperature and the dew point temperature; if the second outlet air temperature is greater than the dew point temperature, adjusting the opening of the second expansion valve to reduce the opening of the second expansion valve until the second outlet air temperature is less than or equal to the dew point temperature; if the second outlet air temperature is less than or equal to the dew point temperature, determining the magnitude of the second outlet air temperature and a third preset temperature, where the third preset temperature is less than the dew point temperature; if the second outlet air temperature is greater than or equal to the third preset temperature, then the second expansion valve is not controlled to maintain its current opening; if the second outlet air temperature is less than the third preset temperature, then the opening of the second expansion valve is adjusted to increase the opening of the second expansion valve until the second outlet air temperature is greater than or equal to the third preset temperature and less than or equal to the dew point temperature.

[0082] Among them, such as Figure 5 As shown, T 环 Q represents the ambient temperature at this time. 湿 T represents the ambient humidity at this time. 露 This indicates the dew point temperature at this point. The third preset temperature can be T. 露-C, where C is the permissible deviation value for the outlet air temperature, ranging from 5 to 8 degrees Celsius. Additionally, the dew point temperature of the environment in which the air conditioning system is located can be determined based on ambient temperature and humidity, using methods found in existing technologies, such as the conversion of the Maglas formula.

[0083] Additionally, when reducing the opening of the second expansion valve, it can be reduced according to a preset ratio, for example, such as... Figure 4 As shown, when reducing the size of the second expansion valve, it is reduced proportionally to n, where n can range from 0.5% to 3%. Additionally, when reducing the size of the refrigerant pump, it can be reduced according to a preset ratio, for example, as... Figure 4 As shown, when reducing the refrigerant pump, the pump should be reduced proportionally by m, where m can range from 1% to 5%.

[0084] In addition, in this embodiment of the application, the outlet air temperature is controlled within a certain range, that is, the second outlet air temperature is greater than or equal to the third preset temperature and less than or equal to the dew point temperature. This can prevent the outlet air temperature from being too low in this dehumidification mode, which would affect the ambient temperature on the user side, that is, affect the temperature at the end of the air conditioning system used by the user.

[0085] In some implementations, the control method may further include: determining the rate of temperature change of the environment in which the air conditioning system is located; if the rate of temperature change is greater than a preset rate of temperature change, determining whether the controller receives a control signal (the control signal is a signal sent by the remote control of the air conditioning system), or determining whether the temperature at the outlet is lower than a preset temperature value; if the controller receives a control signal, or the temperature at the outlet is lower than the preset temperature value, then the refrigerant pump is not controlled so that the refrigerant pump operates according to the current operating load; if the controller does not receive a control signal, and the temperature at the outlet is greater than or equal to the preset temperature value, then the operating load of the refrigerant pump is adjusted to reduce the operating load of the refrigerant pump until the rate of temperature change is less than or equal to the preset rate of temperature change; if the rate of temperature change is less than or equal to the preset rate of temperature change, then the refrigerant pump is not controlled so that the refrigerant pump operates according to the current operating load.

[0086] Among them, such as Figure 5 As shown, ΔT 环 Let L be the rate of change of ambient temperature, and L be the preset rate of change of temperature. Additionally, ΔT... 环 = Ambient temperature one minute ago - current ambient temperature, in °C / min.

[0087] Additionally, if the controller receives a control signal, it indicates that the air conditioning system is controlled by the user via remote control, and the user adjusts the temperature using the remote. If the controller receives a control signal, or the outlet temperature is lower than the preset temperature, it indicates that the ambient temperature drop is not caused by the outlet air temperature of the gas evaporator heat exchanger in dehumidification mode. Conversely, if the controller does not receive a control signal, and the outlet temperature is greater than or equal to the preset temperature, it indicates that the ambient temperature drop is caused by the outlet air temperature of the gas evaporator heat exchanger in dehumidification mode, thus requiring adjustment of the refrigerant pump.

[0088] In some implementations, the control method may further include: acquiring the ambient humidity of the environment where the air conditioning system is located; and stopping the control of the refrigerant pump and the second expansion valve if the ambient humidity is less than or equal to a preset humidity. Here, an ambient humidity less than or equal to the preset humidity indicates that the dehumidification effect has reached the humidity required by the user, therefore the control of the refrigerant pump and the second expansion valve is stopped.

[0089] Among them, such as Figure 5 As shown, Q 湿 Q represents the ambient humidity at this time. 设 This indicates the preset humidity, which is usually the humidity set by the user.

[0090] In addition, in some implementations, such as Figure 5 As shown, once the ambient humidity is less than or equal to the preset humidity, the control method may further include: determining whether the air conditioning system meets the fresh air conditions at this time, that is, determining the concentration of carbon dioxide in the environment, and determining whether it is necessary to inject new air into the environment based on the concentration of carbon dioxide, that is, causing the air conditioning system to turn on the fresh air mode. If the air conditioning system meets the fresh air conditions at this time, the air conditioning system is adjusted from the dehumidification mode to the fresh air mode. If the air conditioning system does not meet the fresh air conditions, the second expansion valve and the refrigerant pump are turned off.

[0091] In some implementations, the air conditioning system may also include a gas-liquid separator, a control valve, and a fourth temperature sensor. The control method may also include: acquiring the gaseous temperature of the refrigerant flowing out of the gas-liquid separator; controlling the control valve to be in the open state when the gaseous temperature is greater than or equal to a preset gaseous temperature; and controlling the control valve to be in the closed state when the gaseous temperature is less than the preset gaseous temperature.

[0092] The evaporator has a gas inlet, and a control valve is connected to the gas inlet. When the control valve is opened, gas can be supplied to the evaporator, which improves the compression effect of the compressor and increases the output capacity of the compressor.

[0093] In this embodiment, the operating modes of the air conditioning system are determined, including a fresh air mode and a dehumidification mode. When the air conditioning system is in fresh air mode, the second expansion valve is controlled to open to a first opening degree, and the refrigerant pump is controlled to operate at full load. The first outlet air temperature of the air-cooled evaporative heat exchanger is obtained, and the opening degree of the second expansion valve and the operating load of the refrigerant pump are adjusted according to the first outlet air temperature. When the air conditioning system is in dehumidification mode, the second expansion valve is controlled to open to a second opening degree, and the refrigerant pump is controlled to operate at full load. The second outlet air temperature of the air-cooled evaporative heat exchanger is obtained, and the opening degree of the second expansion valve is adjusted according to the second outlet air temperature. The first opening degree is greater than the second opening degree. In this embodiment, different controls can be applied to the refrigerant pump and the second expansion valve depending on the air conditioning system's operating mode. This is equivalent to regulating ambient humidity and fresh air through the air-cooled evaporative heat exchanger, and regulating ambient temperature through the fan coil unit. This allows for separate adjustments of ambient humidity, fresh air, and temperature, resulting in better regulation and improved user experience.

[0094] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0095] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An air conditioning system, characterized in that, The air conditioning system includes: a compressor, a condenser, a first expansion valve, an evaporator, a refrigerant pump, a second expansion valve, an air-cooled evaporative heat exchanger, a controller, a gas-liquid separator, and a control valve; The compressor is connected to the condenser, the condenser is connected to the first expansion valve, the first expansion valve is connected to the evaporator, the evaporator is connected to the compressor, the first end of the refrigerant pump is connected between the first expansion valve and the evaporator and communicates with the first expansion valve, the second end of the refrigerant pump is connected to the second expansion valve, the second expansion valve is connected to the air-cooled evaporative heat exchanger, the air-cooled evaporative heat exchanger is connected to the compressor, and both the refrigerant pump and the second expansion valve are electrically connected to the controller. The first end of the gas-liquid separator is connected to the air-cooled evaporative heat exchanger, the second end of the gas-liquid separator is connected to the control valve, and the control valve is connected to the compressor. The third end of the gas-liquid separator is connected to the compressor. The control valve is electrically connected to the controller, which is used to control the opening or closing of the control valve. When the control valve is open, part of the gaseous refrigerant flowing out of the gas-liquid separator flows through the control valve, and the other part flows directly into the compressor. The gaseous refrigerant flowing through the control valve flows into the compressor to replenish the compressor. The evaporator has an inlet, an outlet, a refrigerant inlet, and a refrigerant outlet. The inlet is used to inject cooling water into the evaporator. The outlet is connected to a fan coil unit and is used to transfer the cooling water from the evaporator to the fan coil unit, so that the fan coil unit lowers the temperature of the environment where the air conditioning system is located. The first expansion valve is connected to the refrigerant inlet, and the compressor is connected to the refrigerant outlet. The compressor is used to compress the refrigerant so that the refrigerant flows to the condenser, from the condenser to the first expansion valve, and from the first expansion valve to the refrigerant pump and the refrigerant inlet. The refrigerant also flows from the refrigerant outlet to the compressor, forming a refrigerant circulation. The refrigerant pump is used to pump the refrigerant to the second expansion valve so that the refrigerant flows through the second expansion valve to the air-cooled evaporative heat exchanger. The air-cooled evaporative heat exchanger lowers the temperature of the environment where the air conditioning system is located and transfers the refrigerant to the compressor.

2. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes a fourth temperature sensor; The fourth temperature sensor is electrically connected to the controller and is located between the gas-liquid separator and the control valve. The fourth temperature sensor is used to detect the gaseous temperature of the refrigerant flowing out of the gas-liquid separator and send the gaseous temperature to the controller.

3. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes a first temperature sensor, a second temperature sensor, a third temperature sensor, and a humidity sensor; The first temperature sensor, the second temperature sensor, the third temperature sensor, and the humidity sensor are all electrically connected to the controller; The first temperature sensor is located at the air outlet of the air-cooled evaporative heat exchanger. The first temperature sensor is used to detect the air outlet temperature of the air-cooled evaporative heat exchanger and send the air outlet temperature to the controller. The second temperature sensor is used to detect the ambient temperature of the environment in which the air conditioning system is located, and sends the ambient temperature to the controller; The third temperature sensor is installed at the water outlet and is used to detect the water temperature at the water outlet and send the water temperature to the controller. The humidity sensor is used to detect the ambient humidity of the environment in which the air conditioning system is located, and sends the ambient humidity to the controller.

4. A control method, characterized in that, The control method, applied to the air conditioning system according to any one of claims 1-3, comprises: Determine the operating mode of the air conditioning system, the operating mode including fresh air mode and dehumidification mode; When the air conditioning system is in fresh air mode, the second expansion valve is controlled to open to the first opening degree, and the refrigerant pump is controlled to run at full load. The first outlet air temperature of the air-cooled evaporative heat exchanger is obtained, and the opening degree of the second expansion valve is adjusted according to the first outlet air temperature, and the operating load of the refrigerant pump is adjusted. When the air conditioning system is in dehumidification mode, the second expansion valve is controlled to open to the second opening degree, and the refrigerant pump is controlled to run at full load. The second outlet air temperature of the air-cooled evaporative heat exchanger is obtained, and the opening degree of the second expansion valve is adjusted according to the second outlet air temperature, wherein the first opening degree is greater than the second opening degree.

5. The control method according to claim 4, characterized in that, The step of adjusting the opening of the second expansion valve and adjusting the operating load of the refrigerant pump according to the first outlet air temperature includes: Determine the difference between the first outlet air temperature and the first preset temperature; If the first outlet air temperature is less than or equal to the first preset temperature, the operating load of the refrigerant pump is reduced until the first outlet air temperature is greater than the first preset temperature but less than the second preset temperature, and the second preset temperature is greater than the first preset temperature. If the first outlet air temperature is greater than the first preset temperature, the magnitude of the first outlet air temperature and the second preset temperature is determined. If the first outlet air temperature is less than the second preset temperature, the refrigerant pump is not controlled so that the refrigerant pump operates according to the current operating load. If the first outlet air temperature is greater than or equal to the second preset temperature, the opening of the second expansion valve is reduced until the first outlet air temperature is greater than the first preset temperature and less than the second preset temperature.

6. The control method according to claim 5, characterized in that, When the operating load of the refrigerant pump is reduced, the operating load of the refrigerant pump is detected. If the operating load of the refrigerant pump is equal to the preset operating load, the reduction of the operating load of the refrigerant pump is stopped. When the opening of the second expansion valve is reduced, the opening of the second expansion valve is detected. If the opening of the second expansion valve is equal to the preset opening, the reduction of the opening of the second expansion valve is stopped.

7. The control method according to claim 4, characterized in that, The air conditioning system further includes a first temperature sensor, a second temperature sensor, a third temperature sensor, and a humidity sensor. Adjusting the opening of the second expansion valve based on the second outlet air temperature includes: The ambient temperature and humidity of the environment in which the air conditioning system is located are obtained, and the dew point temperature of the environment in which the air conditioning system is located is determined based on the ambient temperature and humidity. Determine the relative values ​​of the second outlet air temperature and the dew point temperature; If the second outlet air temperature is greater than the dew point temperature, adjust the opening of the second expansion valve to reduce the opening of the second expansion valve until the second outlet air temperature is less than or equal to the dew point temperature. If the second outlet air temperature is less than or equal to the dew point temperature, the magnitude of the second outlet air temperature and the third preset temperature is determined, where the third preset temperature is less than the dew point temperature. If the second outlet air temperature is greater than or equal to the third preset temperature, the second expansion valve is not controlled to maintain its current opening. If the second outlet air temperature is less than the third preset temperature, the opening of the second expansion valve is adjusted to increase its opening until the second outlet air temperature is greater than or equal to the third preset temperature and less than or equal to the dew point temperature.

8. The control method according to claim 7, characterized in that, The control method further includes: Determine the rate of temperature change of the environment in which the air conditioning system is located; If the temperature change rate is greater than a preset temperature change rate, determine whether the controller has received a control signal (sent by the remote control of the air conditioning system), or determine whether the temperature at the water outlet is lower than a preset temperature value. If the controller receives the control signal, or the temperature at the water outlet is lower than the preset temperature value, then the refrigerant pump is not controlled so that it operates according to the current operating load. If the controller does not receive a control signal, and the temperature at the water outlet is greater than or equal to the preset temperature value, then the operating load of the refrigerant pump is adjusted to reduce the operating load until the temperature change rate is less than or equal to the preset temperature change rate. If the temperature change rate is less than or equal to the preset temperature change rate, the refrigerant pump will not be controlled so that the refrigerant pump operates according to the current operating load.

9. The control method according to claim 7, characterized in that, The control method further includes: Obtain the ambient humidity of the environment in which the air conditioning system is located; If the ambient humidity is less than or equal to the preset humidity, then control of the refrigerant pump and the second expansion valve shall be stopped.

10. The control method according to claim 4, characterized in that, The air conditioning system also includes a gas-liquid separator, a control valve, and a fourth temperature sensor, and the control method further includes: Obtain the gaseous temperature of the refrigerant flowing out of the gas-liquid separator; When the gaseous temperature is greater than or equal to a preset gaseous temperature, the control valve is controlled to be in the open state; When the gaseous temperature is lower than the preset gaseous temperature, the control valve is controlled to be in the closed state.

Images