Air conditioning system and control method thereof

Abstract

The invention relates to the technical field of air conditioners, particularly provides an air conditioning system and a control method thereof, and aims at solving the problem that an existing heat exchanger is prone to scaling or bacterium breeding. In order to achieve the purpose, the air conditioning system comprises a first heat exchanger used for conducting heat exchange on water flowing through the first heat exchanger; the control method comprises the steps of determining whether to enter a descaling mode or not according to the working mode of the air conditioning system and the water temperature of the water outlet of the first heat exchanger when the air conditioning system is shut down. Whether a descaling mode is started or not can be accurately judged, and unnecessary descaling is avoided; and in the descaling mode, scale is washed away after expanding and shrinking through temperature changes and flow velocity changes, and descaling is achieved. In the refrigeration mode, whether the sterilization mode is started or not is determined according to the outlet water temperature, and the water temperature at the first heat exchanger can be rapidly increased by switching to the heating mode and closing the water pump, so that sterilization and disinfection are achieved. Whether a sterilization mode is entered or not can be accurately judged, unnecessary sterilization and disinfection can be avoided, and energy is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular provides an air conditioning system and a control method thereof. Background Art

[0002] With the development of economy and society, the application of hot water air conditioning systems is becoming more and more extensive. However, scale is easily generated during the use of hot water air conditioning, especially when the water temperature is high and the water speed is slow, the scale generation rate is fast. The generation of scale greatly reduces the heat exchange efficiency of the plate heat exchanger, thereby affecting the user's use. When the water temperature is low, bacteria and algae grow in the water, and the corpses of bacteria and algae adhere to the surface of the heat exchanger to form scale.

[0003] Therefore, there is an urgent need for an air-conditioning system and a control method thereof to solve the above technical problems. Summary of the Invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the problem that existing heat exchangers are prone to scaling or bacterial growth.

[0005] In a first aspect, the present invention provides a control method for an air-conditioning system, wherein the air-conditioning system includes a first heat exchanger for exchanging heat with water flowing through the first heat exchanger; the control method includes:

[0006] When the air-conditioning system is shut down, whether to enter the descaling mode is determined according to the working mode of the air-conditioning system and the water temperature at the water outlet of the first heat exchanger.

[0007] In a specific embodiment of the control method of the air-conditioning system, “determining whether to enter the descaling mode according to the operating mode of the air-conditioning system and the water temperature at the water outlet” includes:

[0008] If the air conditioning system is in the heating mode and the water temperature at the water outlet is greater than the first preset water temperature, the descaling mode is entered.

[0009] In a specific embodiment of the control method of the air-conditioning system, the air-conditioning system further includes a compressor and a water pump, wherein the water pump is used to drive water to flow through the first heat exchanger; the descaling mode includes:

[0010] The exhaust temperature of the compressor and the speed of the water pump are controlled to change so as to remove scale in the first heat exchanger.

[0011] In a specific embodiment of the control method of the air-conditioning system, “controlling the exhaust temperature of the compressor and the speed of the water pump to change so as to remove scale in the first heat exchanger” includes:

[0012] S11, controlling the water pump speed to decrease and / or the exhaust gas temperature to increase;

[0013] S12: Control the water pump speed to increase or control the water pump speed to increase and the exhaust gas temperature to decrease.

[0014] In a specific embodiment of the control method of the above-mentioned air-conditioning system, during the operation of step S11, if the exhaust temperature rises to the first preset exhaust temperature, the water temperature at the water inlet rises to the second preset water temperature, and the duration reaches the first preset duration, then step S12 is performed after at least one of the three conditions is met; and / or

[0015] During the operation of step S12, if the exhaust temperature drops to the second preset exhaust temperature, the water temperature at the water inlet drops to the third preset water temperature, and the duration reaches the second preset duration, it is determined whether to exit the descaling mode after at least one of the three is met.

[0016] In a specific embodiment of the control method of the air-conditioning system, “controlling the exhaust temperature of the compressor and the speed of the water pump to change so as to remove scale in the first heat exchanger” includes:

[0017] S21, controlling the water pump speed to increase and / or the exhaust gas temperature to decrease;

[0018] S22: controlling the water pump speed to decrease and / or the exhaust gas temperature to increase.

[0019] In a specific embodiment of the control method of the air conditioning system, step S23 is performed after step S22;

[0020] S23, controlling the water pump to increase its speed.

[0021] In a specific embodiment of the control method of the air-conditioning system, during the operation of step S21, if the exhaust temperature drops to the third preset exhaust temperature, and the water temperature at the water inlet drops to the fourth preset water temperature for a duration of time equal to the third preset time, then step S22 is performed after at least one of the three conditions is met;

[0022] During the operation of step S22, if the exhaust temperature rises to the fourth preset exhaust temperature, the water temperature at the water inlet rises to the fifth preset water temperature, and the duration reaches the fourth preset duration, then step S23 is performed;

[0023] During the operation of step S23, if the duration reaches the fifth preset duration, it is determined whether to exit the descaling mode.

[0024] In a specific embodiment of the control method of the air conditioning system, whether to exit the descaling mode is determined based on at least one of the temperature difference between the water inlet and outlet of the first heat exchanger, the water temperature of the water inlet of the first heat exchanger, and the exhaust temperature.

[0025] In a specific embodiment of the control method of the air-conditioning system, “determining whether to exit the descaling mode based on at least one of the temperature difference between the water inlet and outlet of the first heat exchanger, the water temperature at the water inlet of the first heat exchanger, and the exhaust temperature” includes:

[0026] If at least one of the following conditions is met: the temperature difference between the water inlet and outlet of the first heat exchanger is less than a preset temperature difference, the water temperature at the water inlet of the first heat exchanger is less than a sixth preset water temperature, and the exhaust temperature is less than a fifth preset exhaust temperature, the descaling mode is exited.

[0027] In a specific embodiment of the control method of the air conditioning system, after determining whether to exit the descaling mode, if the exit condition is not met, the water pump speed is controlled to decrease and / or the exhaust temperature is controlled to increase.

[0028] In a second aspect, the present invention provides a control method for an air-conditioning system, wherein the air-conditioning system includes a first heat exchanger for exchanging heat with water flowing through the first heat exchanger; the control method includes:

[0029] When the air-conditioning system is shut down, whether to enter the sterilization mode is determined according to the working mode of the air-conditioning system and the water temperature at the water outlet of the first heat exchanger.

[0030] In a specific embodiment of the control method of the air-conditioning system, “determining whether to enter the sterilization mode according to the operating mode of the air-conditioning system and the water temperature at the water outlet” includes:

[0031] If the air-conditioning system is in cooling mode and the water temperature at the water outlet is lower than the seventh preset water temperature, the sterilization mode is entered.

[0032] In a specific embodiment of the control method of the above air-conditioning system, the sterilization mode includes:

[0033] The air conditioning system is controlled to operate in heating mode and the water pump is turned off.

[0034] In a third aspect, the present invention provides an air-conditioning system, comprising a first heat exchanger for exchanging heat with water flowing therethrough; the air-conditioning system further comprises a control module configured to execute the control method of the air-conditioning system as described above.

[0035] When the above technical solution is adopted, the control method of the present invention includes: when the air conditioning system is shut down, determining whether to enter the descaling mode based on the operating mode of the air conditioning system and the water temperature at the water outlet of the first heat exchanger. This can accurately determine whether to enter the descaling mode, avoiding unnecessary descaling and energy waste. Furthermore, in the descaling mode, the scale is flushed away after expanding and contracting through changes in temperature and flow rate, thereby achieving descaling.

[0036] Furthermore, in cooling mode, the outlet water temperature determines whether to enter sterilization mode. By switching to heating mode and shutting down the water pump, the water temperature at the first heat exchanger can be rapidly raised to achieve sterilization and disinfection. Furthermore, the outlet water temperature can accurately determine whether to enter sterilization mode, avoiding unnecessary sterilization and disinfection, saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0038] Figure 1 is a flow chart of a control method provided in Example 1 of the present invention;

[0039] Figure 2 This is a flow chart of the control method provided in the second embodiment of the present invention. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0041] It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for ease of description and are not intended to indicate or imply that the device or component described must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "installed," "disposed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0043] Hot water air conditioners are prone to scale formation during use, especially when the water temperature is high and the water velocity is slow. The scale formation rate is fast, which greatly reduces the heat exchange efficiency of the plate heat exchanger, thereby affecting the user's use. When the water temperature is low, bacteria and algae grow in the water, and the corpses of bacteria and algae adhere to the surface of the heat exchanger to form scale.

[0044] To address the above technical issues, this embodiment discloses an air conditioning system comprising a compressor, a four-way valve, an outdoor heat exchanger, a solenoid valve, and a first heat exchanger. The first heat exchanger is provided with two first and second flow channels, wherein the media within the first and second flow channels can exchange heat. Specifically, the first heat exchanger is a plate heat exchanger. The exhaust side of the compressor is connected to the first port of the four-way valve, and the intake side of the compressor is connected to the second port of the four-way valve. The third port of the four-way valve, the outdoor heat exchanger, the first flow channel, the solenoid valve, and the fourth port of the four-way valve are sequentially arranged.

[0045] The second flow channel, the water pump and the water-using equipment are arranged in sequence. The water in the water-using equipment is driven by the water pump to flow in the second flow channel and exchange heat with the refrigerant in the first flow channel to heat or cool the water.

[0046] The working mode of the air-conditioning system is controlled by switching the four-way valve. In the heating mode, the first interface is connected to the fourth interface, and the second interface is connected to the third interface; the high-temperature and high-pressure gaseous refrigerant flowing out of the compressor flows to the first heat exchanger, releases heat in the first heat exchanger, heats the water in the second flow channel, and flows out of the first heat exchanger. The refrigerant flowing out of the first heat exchanger is liquid refrigerant; then it absorbs heat through the outdoor heat exchanger to become gaseous refrigerant, and then flows to the compressor for compression.

[0047] In cooling mode, the first interface is connected to the third interface, and the second interface is connected to the fourth interface; the high-temperature and high-pressure gaseous refrigerant flowing out of the compressor flows to the outdoor heat exchanger, releases heat at the outdoor heat exchanger, and flows out of the outdoor heat exchanger as liquid refrigerant; then it flows to the first heat exchanger, absorbs heat while flowing in the first flow channel to cool the water flowing through the second flow channel, and the refrigerant flowing out of the first flow channel flows to the compressor for re-compression.

[0048] The air conditioning system further includes a control module configured to execute a control method for the air conditioning system. The control method for the air conditioning system will be described in detail below using three embodiments.

[0049] Example 1

[0050] The control method of the air conditioning system includes:

[0051] When the air conditioning system is shut down, whether to enter the descaling mode is determined based on the operating mode of the air conditioning system and the water temperature at the water outlet of the first heat exchanger. The air conditioning system shuts down when a shutdown command is received and the shutdown operation is about to be performed.

[0052] "Determining whether to enter the descaling mode based on the operating mode of the air conditioning system and the water temperature at the water outlet" specifically includes:

[0053] If the air conditioning system is in heating mode and the water temperature at the water outlet is greater than a first preset water temperature, the descaling mode is entered. The first preset water temperature is preferably 52°C, and in other embodiments, it can be 50°C or 55°C.

[0054] The descaling mode specifically includes:

[0055] The exhaust temperature of the compressor and the speed of the water pump are controlled to change so as to remove scale in the first heat exchanger.

[0056] like Figure 1 As shown, “controlling the exhaust temperature of the compressor and the speed of the water pump to change so as to remove scale in the first heat exchanger” specifically includes the following steps:

[0057] S11. Control the water pump speed to decrease and / or the exhaust temperature to increase; preferably, in this embodiment, the water pump speed is controlled to decrease and the exhaust temperature is controlled to increase. Specifically, the water pump speed is controlled to decrease by a preset value after each preset time, wherein the preset time is preferably 30s, and the preset value is 10; in other embodiments, the preset time may also be 20s or 40s, etc., and the preset value may also be 15 or 20, etc. The increase in exhaust temperature is specifically achieved by controlling the frequency increase of the compressor and the change in the opening of the solenoid valve. By controlling the water pump speed to decrease, the flow rate of water in the second flow channel can be reduced to increase the heating capacity of the water, and the increase in exhaust temperature can increase the heat exchange capacity of the refrigerant in the first flow channel; by these two means, the water temperature at the inlet and outlet of the first flow channel can be increased, that is, the scale in the first flow channel can be expanded.

[0058] During the operation of step S11, if the exhaust temperature rises to the first preset exhaust temperature, the water temperature at the water inlet rises to the second preset water temperature, and the duration reaches the first preset duration, step S12 is performed after at least one of the three is satisfied; in this embodiment, step S12 is performed when any one of them is satisfied, and in other embodiments, step S12 can be performed only when any two or three are satisfied. Specifically, the first preset exhaust temperature = the exhaust temperature before step S11 is performed + a°C, where a is 5 in this embodiment, and can also be 6 or 7 in other embodiments. The second preset water temperature = the water temperature at the water inlet before step S11 is performed + b°C, where b is 5 in this embodiment, and can also be 6 or 7 in other embodiments. The duration reaches the first preset duration, and the duration refers to the duration of the water temperature rising in the second flow channel. In this embodiment, the first preset duration is 3 minutes, and can also be 4 minutes or 5 minutes in other embodiments.

[0059] S12. Control the water pump speed to increase or control the water pump speed to increase and the exhaust temperature to decrease. Preferably, in this embodiment, the water pump speed is controlled to increase and the exhaust temperature is decreased; controlling the water pump speed to increase to the maximum speed can cause a drastic change in the water flow in the second flow channel, causing the second flow channel to vibrate, so that the scale falls off the side wall of the second flow channel and is washed away. Increasing the water pump speed can reduce the water temperature at the water inlet; the reduction in exhaust temperature is specifically achieved by controlling the frequency reduction of the compressor and the change in the opening of the solenoid valve. The reduction in exhaust temperature can reduce the heat exchange capacity of the refrigerant in the first flow channel; these two means can reduce the water temperature at the inlet and outlet of the first flow channel, that is, the scale in the first flow channel can be shrunk. The scale expands and contracts in a short period of time, and the flow rate changes drastically in a short period of time; the scale can be more easily fallen off the side wall and washed away by water.

[0060] During the operation of step S12, if the exhaust temperature drops to the second preset exhaust temperature, the water temperature at the water inlet drops to the third preset water temperature, and the duration reaches the second preset duration, it is determined whether to exit the descaling mode after at least one of the three is met. In this embodiment, it is determined whether to exit the descaling mode when any one of them is met. In other embodiments, it is also possible to determine whether to exit the descaling mode when any two or three are met. Specifically, the second preset exhaust temperature = the exhaust temperature before step S11 is performed - c°C, where c in this embodiment is 5, and can also be 6 or 7 in other embodiments. The third preset water temperature = the water inlet temperature before step S11 is performed - d°C, where d in this embodiment is 5, and can also be 6 or 7 in other embodiments. The duration reaches the second preset duration, and the duration refers to the duration of the drop in the water temperature in the second flow channel. In this embodiment, the second preset duration is 3 minutes, and can also be 4 minutes or 5 minutes in other embodiments.

[0061] The “determining whether to exit the descaling mode” includes: determining whether to exit the descaling mode based on at least one of the temperature difference between the water inlet and outlet of the first heat exchanger, the water temperature at the water inlet of the first heat exchanger, and the exhaust temperature.

[0062] “Determining whether to exit the descaling mode based on at least one of a temperature difference between a water inlet and a water outlet of the first heat exchanger, a water temperature at the water inlet of the first heat exchanger, and an exhaust temperature” includes:

[0063] If the temperature difference between the water inlet and outlet of the first heat exchanger is less than the preset temperature difference, the water temperature at the water inlet of the first heat exchanger is less than the sixth preset water temperature, and the exhaust temperature is less than the fifth preset exhaust temperature, at least one of the three is met, then the descaling mode is exited. In this embodiment, preferably, the temperature difference is less than the preset temperature difference, and the water temperature at the water inlet is less than the sixth preset temperature or the exhaust temperature is less than the fifth preset exhaust temperature is met. In other embodiments, the descaling mode may be exited if any one of them is met, or the descaling mode may be exited if all three are met. Specifically, the preset temperature difference is selected as 1°C in this embodiment, and in other embodiments, it may also be 1.2 or 1.5°C; wherein the sixth preset water temperature in this embodiment is preferably 60°C, and in other embodiments, it may also be 62°C or 58°C, etc. wherein the fifth preset exhaust temperature is preferably 80°C in this embodiment, and in other embodiments, it may also be 85°C or 75°C, etc.

[0064] After determining whether to exit the descaling mode, if the exit conditions are not met, the water pump speed is controlled to decrease and / or the exhaust temperature is increased. Specifically, in this embodiment, the exhaust temperature of the compressor is controlled to remain unchanged, and only the speed of the water pump is reduced. The speed of the water pump is specifically controlled to decrease by a preset value after each preset time, wherein the preset time is preferably 30s, and the preset value is 10; in other embodiments, the preset time may also be 20s or 40s, etc., and the preset value may also be 15 or 20, etc. The heat exchange capacity can be enhanced by reducing the speed of the water pump, so that the temperature of the water outlet and the temperature of the water inlet increase, and the temperature difference between the water inlet and the water outlet can be reduced. After the sixth preset time period has been continuously run, it is determined again whether to exit the descaling mode. The sixth preset time period is preferably 3 minutes in this embodiment; in other embodiments, it may also be 4 minutes or 5 minutes.

[0065] Example 2

[0066] This embodiment discloses a control method for an air conditioning system. The control method in this embodiment is basically the same as that in the first embodiment, with the following differences.

[0067] like Figure 2 As shown, “controlling the exhaust temperature of the compressor and the speed of the water pump to change so as to remove scale in the first heat exchanger” specifically includes:

[0068] S21. Control the water pump speed to increase and / or the exhaust temperature to decrease. Preferably, in this embodiment, the water pump speed is controlled to increase and the exhaust temperature is controlled to decrease. Increasing the water pump speed reduces the heat exchange capacity, thereby reducing the water temperature at the inlet and outlet. The reduction in exhaust temperature is achieved by controlling the compressor frequency to decrease and the solenoid valve opening to change. The reduction in exhaust temperature can reduce the heat exchange capacity of the refrigerant in the first flow channel. These two methods can reduce the water temperature at the inlet and outlet of the first flow channel, thereby shrinking the scale in the first flow channel.

[0069] During the operation of step S21, if the exhaust temperature drops to the third preset exhaust temperature, the water temperature at the water inlet drops to the fourth preset water temperature, and the duration reaches the third preset duration, step S22 is performed after at least one of the three conditions is met; in this embodiment, it is determined whether to exit the descaling mode when any one of them is met. In other embodiments, it can also be determined whether to exit the descaling mode when any two or three of them are met. Specifically, the third preset exhaust temperature = the exhaust temperature before step S21 is performed - e°C, where the value of e in this embodiment is 5, and it can also be 6 or 7 in other embodiments. The fourth preset water temperature = the water temperature at the water inlet before step S21 is performed - f°C, where the value of f in this embodiment is 5, and it can also be 6 or 7 in other embodiments. The duration reaches the third preset duration, and the duration refers to the duration of the drop in the water temperature in the second flow channel. In this embodiment, the third preset duration is 3 minutes, and it can also be 4 minutes or 5 minutes in other embodiments.

[0070] S22, control the water pump speed to decrease and / or the exhaust temperature to increase; preferably, in this embodiment, the water pump speed is controlled to decrease and the exhaust temperature is controlled to increase, specifically, the water pump speed is controlled to decrease by a preset value after each preset time, wherein the preset time is preferably 30s, and the preset value is 10; in other embodiments, the preset time may also be 20s or 40s, etc., and the preset value may also be 15 or 20, etc. The increase in exhaust temperature is specifically achieved by controlling the frequency increase of the compressor and the change in the opening of the solenoid valve. By controlling the water pump speed to decrease, the flow rate of water in the second flow channel can be reduced to increase the heating capacity of the water, and the increase in exhaust temperature can increase the heat exchange capacity of the refrigerant in the first flow channel; through these two means, the water temperature at the inlet and outlet of the first flow channel can be increased, that is, the scale in the first flow channel can be expanded.

[0071] During the operation of step S22, if the exhaust temperature rises to the fourth preset exhaust temperature, the water temperature at the water inlet rises to the fifth preset water temperature, and the duration reaches the fourth preset duration, step S23 is performed after at least one of the three is satisfied; in this embodiment, step S12 is performed when any one of them is satisfied, and in other embodiments, step S12 can be performed only when any two or three are satisfied. Specifically, the fourth preset exhaust temperature = the exhaust temperature before step S21 is performed + g°C, where the value of g in this embodiment is 5, and it can also be 6 or 7 in other embodiments. The second and fifth preset water temperatures = the water inlet water temperature before step S21 is performed + h°C, where the value of b in this embodiment is 5, and it can also be 6 or 7 in other embodiments. The duration reaches the first preset duration, and the duration refers to the duration of the water temperature rising in the second flow channel. The fourth preset duration in this embodiment is 3 minutes, and it can also be 4 minutes or 5 minutes in other embodiments.

[0072] S23. Control the water pump speed to increase. Specifically, control the water pump speed to a maximum. This can cause a dramatic change in the water flow rate in the second flow channel, causing the second flow channel to vibrate, thereby causing scale to fall from the sidewalls of the second flow channel and be flushed away. The scale expands and contracts within a short period of time, and the flow rate changes dramatically within a short period of time, making it easier for the scale to fall off the sidewalls and be flushed away by water.

[0073] During the operation of step S23, if the duration reaches the fifth preset duration, it is determined whether to exit the descaling mode. The fifth preset duration is preferably 3 minutes, and in other embodiments it may also be 4 minutes or 5 minutes.

[0074] Example 3

[0075] This embodiment discloses a control method for an air conditioning system, the control method comprising:

[0076] When the air-conditioning system is shut down, whether to enter the sterilization mode is determined according to the working mode of the air-conditioning system and the water temperature at the water outlet of the first heat exchanger.

[0077] Specifically, "determining whether to enter the sterilization mode based on the operating mode of the air conditioning system and the water temperature at the water outlet" includes:

[0078] If the air conditioning system is in cooling mode and the water temperature at the water outlet is lower than the third preset water temperature, the sterilization mode is entered. Specifically, in this embodiment, the third preset water temperature is preferably 10°C, and in other embodiments, it may also be 11 or 12°C.

[0079] The sterilization mode controls the air conditioning system to operate in heating mode and shuts down the water pump. This stops the pump, allowing the temperature in the second flow channel to rise rapidly, reaching a high enough level to kill algae and bacteria. This rapid temperature rise in the second flow channel also achieves rapid sterilization and energy savings. Furthermore, since the pump is stopped, water is no longer flowing through the channel, preventing users from using cold water.

[0080] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A method for controlling an air conditioning system, characterized in that: The air conditioning system includes a first heat exchanger for exchanging heat with water flowing through the system; the control method includes: When the air-conditioning system is shut down, whether to enter the descaling mode is determined according to the working mode of the air-conditioning system and the water temperature at the water outlet of the first heat exchanger.

2. The control method of the air conditioning system according to claim 1, characterized in that: "Determining whether to enter the descaling mode based on the operating mode of the air conditioning system and the water temperature at the water outlet" includes: If the air conditioning system is in the heating mode and the water temperature at the water outlet is greater than the first preset water temperature, the descaling mode is entered.

3. The control method of the air conditioning system according to claim 1 or 2, characterized in that: The air conditioning system further includes a compressor and a water pump, wherein the water pump is used to drive water to flow through the first heat exchanger; the descaling mode includes: The exhaust temperature of the compressor and the speed of the water pump are controlled to change so as to remove scale in the first heat exchanger.

4. The control method of the air conditioning system according to claim 3, characterized in that: “Controlling the exhaust temperature of the compressor and the speed of the water pump to remove scale in the first heat exchanger” includes: S11, controlling the water pump speed to decrease and / or the exhaust gas temperature to increase; S12, controlling the water pump speed to increase or controlling the water pump speed to increase and the exhaust gas temperature to decrease; Preferably, during the operation of step S11, if the exhaust temperature rises to the first preset exhaust temperature, the water temperature at the water inlet rises to the second preset water temperature, and the duration reaches the first preset duration, then step S12 is performed after at least one of the three conditions is met; and / or During the operation of step S12, if the exhaust temperature drops to the second preset exhaust temperature, the water temperature at the water inlet drops to the third preset water temperature, and the duration reaches the second preset duration, it is determined whether to exit the descaling mode after at least one of the three is met.

5. The control method of the air conditioning system according to claim 3, characterized in that: “Controlling the exhaust temperature of the compressor and the speed of the water pump to remove scale in the first heat exchanger” includes: S21, controlling the water pump speed to increase and / or the exhaust gas temperature to decrease; S22, controlling the water pump speed to decrease and / or the exhaust gas temperature to increase; Preferably, step S23 is performed after step S22; S23, controlling the water pump speed to increase; Preferably, during the operation of step S21, if the exhaust temperature drops to the third preset exhaust temperature, the water temperature at the water inlet drops to the fourth preset water temperature, and the duration reaches the third preset duration, then step S22 is performed after at least one of the three conditions is met; During the operation of step S22, if the exhaust temperature rises to the fourth preset exhaust temperature, the water temperature at the water inlet rises to the fifth preset water temperature, and the duration reaches the fourth preset duration, then step S23 is performed; During the operation of step S23, if the duration reaches the fifth preset duration, it is determined whether to exit the descaling mode.

6. The air conditioning system according to any one of claims 1 to 5, characterized in that: determining whether to exit the descaling mode based on at least one of a temperature difference between a water inlet and a water outlet of the first heat exchanger, a water temperature at the water inlet of the first heat exchanger, and the exhaust gas temperature; Preferably, “determining whether to exit the descaling mode based on at least one of the temperature difference between the water inlet and outlet of the first heat exchanger, the water temperature of the water inlet of the first heat exchanger, and the exhaust temperature” includes: If at least one of the following conditions is met: the temperature difference between the water inlet and outlet of the first heat exchanger is less than a preset temperature difference, the water temperature at the water inlet of the first heat exchanger is less than a sixth preset water temperature, and the exhaust temperature is less than a fifth preset exhaust temperature, the descaling mode is exited.

7. The air conditioning system according to claim 6, characterized in that After determining whether to exit the descaling mode, if the exit condition is not met, the water pump speed is controlled to decrease and / or the exhaust gas temperature is controlled to increase.

8. A method for controlling an air conditioning system, characterized in that: The air conditioning system includes a first heat exchanger for exchanging heat with water flowing through the system; the control method includes: When the air-conditioning system is shut down, whether to enter the sterilization mode is determined according to the working mode of the air-conditioning system and the water temperature at the water outlet of the first heat exchanger.

9. The control method of the air conditioning system according to claim 8, characterized in that: "Determining whether to enter the sterilization mode based on the operating mode of the air conditioning system and the water temperature at the water outlet" includes: If the air conditioning system is in cooling mode and the water temperature at the water outlet is lower than the seventh preset water temperature, the sterilization mode is entered; Preferably, the sterilization mode includes: The air conditioning system is controlled to operate in heating mode and the water pump is turned off.

10. An air conditioning system, characterized in that: The air-conditioning system includes a first heat exchanger for exchanging heat with water flowing therethrough; the air-conditioning system also includes a control module configured to execute the air-conditioning system control method according to any one of claims 1 to 9.

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