Air conditioning system and control method thereof

Abstract

The application discloses an air conditioning system and a control method thereof. The air conditioning system comprises a compressor, an evaporator, a condenser, a subcooler, a hot water generator and a subcooling throttle valve. The condenser is arranged between the compressor and the evaporator. The subcooler is arranged between the condenser and the evaporator. A first end of the subcooler is connected with the condenser. A second end of the subcooler is connected with the evaporator. The hot water generator comprises a refrigerant pipe. A first end of the refrigerant pipe is connected with the compressor, and a second end of the refrigerant pipe is connected with the second end of the subcooler. The subcooling throttle valve is used for controlling the subcooling degree of the subcooler. When the air conditioning system is in a cooling mode, a current opening degree of the subcooling throttle valve is adjusted according to the temperature of the refrigerant output from the second end of the refrigerant pipe. The embodiment of the application effectively avoids the problem of insufficient refrigerant subcooling degree of the indoor unit caused by the excessively high temperature of the refrigerant output from the refrigerant pipe, and further improves the noise problem.

Description

Technical Field

[0001] This invention relates to an air conditioning system and its control method. Background Technology

[0002] Dual-supply air conditioning systems combine efficient cooling and dehumidification (air conditioner) with heating (underfloor heating), making them a very popular product in recent years. The principle behind this system is that the compressor outputs high-temperature, high-pressure refrigerant. Part of this refrigerant heats the chilled water through a water generator to provide hot water, while the other part condenses in the condenser and then evaporates in the evaporator to absorb heat and provide cooling.

[0003] Compared to existing air conditioners, this air conditioning system adds a hot water generator. In related technologies, the hot water generator is integrated with the condenser inside the outdoor unit. During summer cooling, the hot water generator is not used. To prevent refrigerant buildup, the expansion valve of the hot water generator will open slightly, which can lead to insufficient subcooling and indoor unit noise.

[0004] It should be noted that the statements in this background section only provide background information related to the present invention and do not necessarily constitute prior art. Summary of the Invention

[0005] This invention provides an air conditioning system and its control method to reduce indoor unit noise.

[0006] The first aspect of the present invention provides an air conditioning system, comprising:

[0007] compressor;

[0008] Evaporator;

[0009] The condenser is located between the compressor and the evaporator;

[0010] The subcooler is located between the condenser and the evaporator. The first end of the subcooler is connected to the condenser, and the second end of the subcooler is connected to the evaporator.

[0011] A hot water generator includes refrigerant pipes, one end of which is connected to the compressor, and the other end of which is connected to the second end of the subcooler; and

[0012] The subcooling throttle valve is used to control the subcooling degree of the subcooler. When the air conditioning system is in cooling mode, the current opening degree of the subcooling throttle valve is configured to be adjusted according to the temperature of the refrigerant output from the second end of the refrigerant pipe.

[0013] In some embodiments, the current opening of the subcooling throttle valve is configured to be positively correlated with the temperature of the refrigerant output from the second end of the refrigerant pipe.

[0014] In some embodiments, the current opening of the subcooling throttle valve is configured to be adjusted based on the temperature of the refrigerant output from the second end of the refrigerant pipe, the temperature of the refrigerant output from the condenser, the temperature of the refrigerant output from the subcooler, and the suction superheat of the compressor.

[0015] In some embodiments, the current opening degree of the subcooling throttle valve is the sum of an initial opening value and an opening adjustment amount, wherein the initial opening value is configured to be obtained based on the difference between the temperature of the refrigerant output from the condenser and the temperature of the refrigerant output from the subcooler, and the opening adjustment amount is configured to be obtained based on the difference between the temperature of the refrigerant output from the condenser and the temperature of the refrigerant output from the subcooler, the suction superheat of the compressor, the refrigerant temperature output from the second end of the refrigerant pipe, and the temperature of the refrigerant output from the subcooler.

[0016] In some embodiments, the formula for calculating the opening adjustment amount is: △S=T1-T2*α+β*T3-T12, where T1 refers to the difference between the refrigerant temperature output by the condenser and the refrigerant temperature output by the subcooler, T2 refers to the suction superheat of the compressor, T3 refers to the refrigerant temperature output by the second end of the refrigerant pipe, T12 refers to the refrigerant temperature output by the subcooler 50, and α and β are constants.

[0017] In some embodiments, the air conditioning system further includes a controller connected to the subcooling throttle valve, and the controller is configured to adjust the opening of the subcooling throttle valve according to the temperature of the refrigerant output from the second end of the refrigerant pipe, the temperature of the refrigerant output from the condenser, the temperature of the refrigerant output from the subcooler, and the suction superheat of the compressor.

[0018] In some embodiments, the air conditioning system further includes a high-pressure gas pipe connected to a first end of a refrigerant pipe, and a high-pressure gas pipe valve is provided on the high-pressure gas pipe.

[0019] In some embodiments, the air conditioning system further includes a valve assembly, through which the compressor is connected to the condenser, the hot water generator, and the evaporator, and the valve assembly is activated to control the air conditioning system to switch between cooling mode and heating mode.

[0020] In some embodiments, the valve assembly includes a first four-way valve and a second four-way valve. The first valve port of the first four-way valve is connected to the discharge port of the compressor, the second valve port of the first four-way valve is connected to the condenser, the third and fourth valve ports of the first four-way valve are connected to the suction port of the compressor, the first valve port of the second four-way valve is connected to the discharge port of the compressor, the second and third valve ports of the second four-way valve are connected to the suction port of the compressor, and the fourth valve port of the second four-way valve is connected to the evaporator.

[0021] A second aspect of the present invention provides a control method for an air conditioning system based on the above-mentioned air conditioning system, comprising the following steps:

[0022] Obtain the temperature of the refrigerant output from the second end of the refrigerant pipe;

[0023] Adjust the current opening of the subcooling throttle valve according to the temperature of the refrigerant output from the second end of the refrigerant pipe.

[0024] Based on the technical solution provided by this invention, an air conditioning system includes a compressor, an evaporator, a condenser, a subcooler, a hot water generator, and a subcooling throttling valve. The condenser is disposed between the compressor and the evaporator. The subcooler is disposed between the condenser and the evaporator. A first end of the subcooler is connected to the condenser. A second end of the subcooler is connected to the evaporator. The hot water generator includes a refrigerant pipe. A first end of the refrigerant pipe is connected to the compressor, and a second end of the refrigerant pipe is connected to a second end of the subcooler. The subcooling throttling valve is used to control the subcooling degree of the subcooler. When the air conditioning system is in cooling mode, the current opening of the subcooling throttling valve is configured to be adjusted according to the temperature of the refrigerant output from the second end of the refrigerant pipe. This embodiment of the invention incorporates the temperature of the refrigerant output from the refrigerant pipe into the control parameters for adjusting the opening of the subcooling throttling valve. Thus, when adjusting the opening of the subcooling throttling valve, the temperature of the refrigerant output from the hot water generator's refrigerant pipe is taken into account, effectively avoiding the problem of insufficient subcooling of the indoor unit caused by excessively high refrigerant temperature output from the refrigerant pipe, thereby improving noise levels.

[0025] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of an air conditioning system according to some embodiments of the present invention.

[0028] Figure 2 This is a schematic diagram of the structure of an air conditioning system according to other embodiments of the present invention.

[0029] Figure 3 This is a flowchart illustrating the steps of a control method for an air conditioning system according to some embodiments of the present invention. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0032] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0033] refer to Figure 1In some embodiments, the air conditioning system includes a compressor 10, a condenser 40, a subcooler 50, a hot water generator 60, and an evaporator. The discharge port of the compressor 10 is connected to the condenser 40, the condenser 40 is connected to a first end of the subcooler 50, and the second end of the subcooler 50 is connected to the evaporator. The hot water generator 60 includes a refrigerant pipe 120. A first end of the refrigerant pipe 120 is connected to the compressor 10, and a second end of the refrigerant pipe 120 is connected to a second end of the subcooler 50. The hot water generator 60, subcooler 50, and condenser 40 are integrated into the outdoor unit. The evaporator is located in the indoor unit.

[0034] In heating mode, part of the high-temperature, high-pressure refrigerant output by compressor 10 goes directly to the indoor unit for heat dissipation, while the other part enters the water generator 60 to heat the water in its pipes. The refrigerant after heating the water, along with the refrigerant output from the indoor heat exchanger, enters the outdoor heat exchanger for evaporation and then returns to compressor 10. Therefore, the water generator is in operation during heating mode, and the refrigerant flow is normal.

[0035] In cooling mode, a portion of the high-temperature, high-pressure refrigerant output by compressor 10 directly enters the condenser of the outdoor unit for condensation. The hot water generator 60 is not used in cooling mode, but to prevent refrigerant buildup, the refrigerant pipe 120 connecting the hot water generator 60 to compressor 20 is kept connected. In this embodiment, the second end of refrigerant pipe 120 is connected to the second end of subcooler 50, meaning that high-temperature, high-pressure gaseous refrigerant flows into the evaporator through refrigerant pipe 120. However, the second end of subcooler 50 outputs condensed and subcooled liquid refrigerant. Therefore, when gaseous and liquid refrigerant are simultaneously input into the indoor unit, they collide, causing noise.

[0036] To improve the above issues and reduce the noise of the indoor unit, please refer to... Figure 1 This invention provides an air conditioning system including a compressor 10, an evaporator, a condenser 40, a subcooler 50, a hot water generator 60, and a subcooling expansion valve 82. The condenser 40 is disposed between the compressor 10 and the evaporator. The subcooler 50 is disposed between the condenser 40 and the evaporator. A first end of the subcooler 50 is connected to the condenser 40. A second end of the subcooler 50 is connected to the evaporator. The hot water generator 60 includes a water pipe 90 and a refrigerant pipe 120. A first end of the refrigerant pipe 120 is connected to the compressor 10, and a second end of the refrigerant pipe 120 is connected to a second end of the subcooler 50. The subcooling expansion valve 82 is used to control the subcooling degree of the subcooler 50. When the air conditioning system is in cooling mode, the current opening of the subcooling expansion valve 82 is configured to be adjusted according to the temperature of the refrigerant output from the second end of the refrigerant pipe 120.

[0037] The air conditioning system of this invention incorporates the temperature of the refrigerant output from the refrigerant pipe 120 into the control parameters for adjusting the opening of the subcooling throttle valve 82. In this way, when adjusting the opening of the subcooling throttle valve 82, the temperature of the refrigerant output from the refrigerant pipe 120 of the hot water generator 60 is taken into account, effectively avoiding the problem of insufficient subcooling of the indoor unit caused by the refrigerant temperature output from the refrigerant pipe 120 being too high, thereby improving the noise problem.

[0038] In some embodiments, the current opening of the subcooling throttle valve 82 is configured to be positively correlated with the temperature of the refrigerant output from the second end of the refrigerant pipe 120. That is, the higher the temperature of the refrigerant output from the second end of the refrigerant pipe 120, the larger the opening of the subcooling throttle valve 82 is set, so that the subcooling degree of the refrigerant after being cooled by the subcooler 50 is greater. In this way, when the gaseous refrigerant output from the refrigerant pipe 120 mixes with the liquid refrigerant output from the subcooler 50, the gaseous refrigerant output from the refrigerant pipe 120 can be liquefied due to the higher subcooling degree of the liquid refrigerant output from the subcooler 50. Thus, when it enters the indoor unit, it enters in the form of liquid refrigerant, thereby reducing noise.

[0039] In some embodiments, the current opening of the subcooling throttle valve 82 is positively correlated with the temperature difference between the refrigerant temperature output from the second end of the refrigerant pipe 120 and the refrigerant temperature output from the subcooler 50. That is, the greater the temperature difference between the refrigerant temperature output from the second end of the refrigerant pipe 120 and the refrigerant temperature output from the subcooler 50, the larger the opening of the subcooling throttle valve 82 is set.

[0040] In some embodiments, the current opening of the subcooling throttle valve 82 is configured to be adjusted based on the temperature of the refrigerant output from the second end of the refrigerant pipe, the temperature of the refrigerant output from the condenser 40, the temperature of the refrigerant output from the subcooler 50, and the suction superheat of the compressor 10.

[0041] In some embodiments, the current opening degree of the subcooling throttle valve 82 is the sum of an initial opening value and an adjustment amount, wherein the initial opening value is obtained based on the difference between the temperature of the refrigerant output from the condenser 40 and the temperature of the refrigerant output from the subcooler 50. The adjustment amount is obtained based on the difference between the temperature of the refrigerant output from the condenser 40 and the temperature of the refrigerant output from the subcooler 50, the compressor suction superheat, the refrigerant temperature output from the second end of the refrigerant pipe, and the refrigerant temperature output from the subcooler 50.

[0042] In some embodiments, the formula for calculating the opening adjustment amount is: ΔS = T1 - T2 * α + β * T3 - T12, where T1 refers to the difference between the refrigerant temperature output by the condenser 40 and the refrigerant temperature output by the subcooler 50, T2 refers to the compressor suction superheat, T3 refers to the refrigerant temperature output from the second end of the refrigerant pipe, T12 refers to the refrigerant temperature output by the subcooler 50, and α and β are constants. Furthermore, α and β are positive numbers.

[0043] In some embodiments, the air conditioning system further includes a controller. The controller is signal-connected to the subcooling throttle valve 82 and is configured to adjust the opening degree of the subcooling throttle valve 82 based on the temperature of the refrigerant output from the second end of the refrigerant pipe, the temperature of the refrigerant output from the condenser 40, the temperature of the refrigerant output from the subcooler 50, and the suction superheat of the compressor 10.

[0044] In some embodiments, the air conditioning system further includes a high-pressure gas pipe connected to the first end of the refrigerant pipe 120, and a high-pressure gas pipe valve 83 is provided on the high-pressure gas pipe.

[0045] In some embodiments, the air conditioning system further includes a valve assembly 30, through which the compressor 10 is connected to the condenser 40, the hot water generator 60 and the evaporator, and the valve assembly is activated to control the air conditioning system to switch between cooling mode and heating mode.

[0046] like Figure 3 As shown in the figure, this embodiment of the invention also provides a control method for an air conditioning system, comprising the following steps:

[0047] S310, obtain the temperature of the refrigerant output from the second end of the refrigerant pipe 120;

[0048] S320, adjusts the current opening degree of the subcooling throttle valve 82 according to the temperature of the refrigerant output from the second end of the refrigerant pipe 120.

[0049] The control method of the air conditioning system in this embodiment of the invention obtains the temperature of the refrigerant output from the second end of the refrigerant pipe 120 of the hot water generator, and adjusts the current opening of the subcooling throttling valve according to the temperature. In this way, when adjusting the opening of the subcooling throttling valve 82, the temperature of the refrigerant output from the refrigerant pipe 120 of the hot water generator 60 is taken into account, effectively avoiding the problem of insufficient subcooling of the indoor unit caused by the refrigerant output from the refrigerant pipe 120 being too high, thereby improving the noise problem.

[0050] The following is based on Figure 1 and Figure 2 The structure and operation of the air conditioning system according to two specific embodiments of the present invention will be described in detail.

[0051] like Figure 1As shown, the air conditioning system in this embodiment includes a compressor 10, an oil separator 20, a valve assembly 30, a condenser 40, a subcooler 50, a hot water generator 60, and a gas-liquid separator 70.

[0052] The suction port of compressor 10 is connected to gas-liquid separator 70. A low-pressure sensor 87 is installed between the discharge port of compressor 10 and gas-liquid separator 70. The discharge port of compressor 10 is connected to oil separator 20. A high-pressure switch 88 is installed between the discharge port of compressor 10 and oil separator 20.

[0053] Oil separator 20 is connected to valve assembly 30. Valve assembly 30 has a first control port, a second control port, a third control port, a fourth control port, and a fifth control port. Oil separator 20 is connected to the first control port of valve assembly 30. The second control port of valve assembly 30 is connected to condenser 40, the third control port of valve assembly 30 is connected to gas-liquid separator 70, and the fourth control port of valve assembly 30 is connected to hot water generator 60. The fifth control port of valve assembly 30 is connected to the outlet of evaporator (not shown in the diagram), and a gas pipe valve 85 is provided between the fifth control port of valve assembly 30 and the outlet of evaporator.

[0054] In some embodiments, such as Figure 2 As shown, valve assembly 30 includes a first four-way valve 31 and a second four-way valve 32. The first four-way valve 31 has a first valve port, a second valve port, a third valve port, and a fourth valve port. The first valve port of the first four-way valve 31 is connected to the oil separator 20, the second valve port of the first four-way valve 31 is connected to the condenser 40, and both the third and fourth valve ports of the first four-way valve 31 are connected to the gas-liquid separator 70. The second four-way valve 32 also has a first valve port, a second valve port, a third valve port, and a fourth valve port. The first valve port of the second four-way valve 32 is connected to the oil separator 20, and both the second and third valve ports of the second four-way valve 32 are connected to the gas separator 70. The fourth valve port of the second four-way valve 32 is connected to the gas outlet of the evaporator via a gas pipe valve 85.

[0055] The air conditioning system in this embodiment also includes a high-pressure gas pipe connected to the fourth control port of the valve assembly 30, and a high-pressure gas pipe valve 83 is provided on the high-pressure gas pipe.

[0056] The condenser 40 is connected to the liquid inlet of the evaporator via a condenser tube. A condenser throttling valve 81, a subcooler 50, and a liquid line valve 84 are sequentially installed on the condenser tube. The subcooler 50 is used to further cool the liquid condensed in the condenser 40, ensuring its temperature is below the saturation temperature at the condensing pressure.

[0057] The air conditioning system in this embodiment also includes a subcooling throttling valve 82. The inlet of the subcooling throttling valve 82 is connected to the first end of the subcooler 50, and the outlet of the subcooling throttling valve 82 is connected to the third control port of the valve assembly 30.

[0058] The air conditioning system also includes a condensing throttling valve 81 disposed between the condenser 40 and the subcooler 50. A pressure regulating valve 89 is connected in parallel to both ends of the condensing throttling valve 81.

[0059] The hot water generator 60 includes a water pipe 90 and a refrigerant pipe 120. The water pipe has an inlet 91 and an outlet 92. A first end of the refrigerant pipe 120 is connected to a fourth control port of the valve assembly 30. A second end of the refrigerant pipe 120 is connected to a second end of the subcooler 50. A hot water throttling valve 80 is provided on the refrigerant pipe 120. In this embodiment, the air conditioning system connects the second end of the refrigerant pipe 120 to the second end of the subcooler 50, thus integrating the hot water generator 60 into the outdoor unit, making the air conditioning system more compact and smaller in size.

[0060] The hot water generator 60 is integrated into the outdoor unit, but it is generally not used during summer cooling. To prevent refrigerant buildup, the hot water throttle valve 80 usually needs to maintain a certain opening. This causes the refrigerant pipe 120 to deliver high-temperature, high-pressure refrigerant gas to the second end of the subcooler 50. This results in the high-temperature, high-pressure refrigerant gas and the liquid refrigerant output from the subcooler 50 colliding inside the indoor unit, causing insufficient subcooling and resulting in noise problems in the indoor unit.

[0061] To improve the above problems, in this embodiment, the second end of the refrigerant pipe 120 is connected to the second end of the subcooler 50. At this time, the subcooled refrigerant will mix with the refrigerant output from the second end of the refrigerant pipe 120 and enter the indoor unit. This is because the inventors of this application proposed to add the temperature of the refrigerant output from the second end of the refrigerant pipe 120 to the parameters controlling the opening of the subcooling throttle valve 82. The higher the temperature of the refrigerant output from the second end of the refrigerant pipe 120, the larger the opening of the subcooling throttle valve 82, thereby increasing the subcooling degree of the subcooler 50 and improving the indoor unit noise problem caused by insufficient subcooling degree.

[0062] Specifically, the current opening degree of the subcooled throttle valve 82 = the original opening degree + the change in opening degree ΔS.

[0063] △S = fT1, T2, T3, where T1 = T 11 -T 12 T 11 This refers to the temperature of the refrigerant output from the condenser, T. 12 This refers to the temperature of the refrigerant output from the subcooler 50. T2 is the suction superheat. T3 is the temperature of the refrigerant output from the refrigerant pipe 120 of the hot water generator.

[0064] In one specific embodiment, ΔS = T1 - T2 * α + β * T3 - T 12 α and β are both positive numbers.

[0065] In some embodiments, the original opening degree S of the subcooled throttle valve 82 is f, where f is a decreasing function with T1 as a parameter.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. An air conditioning system, characterized in that, include: Compressor (10); Evaporator; A condenser (40) is disposed between the compressor (10) and the evaporator; A subcooler (50) is disposed between the condenser (40) and the evaporator, with a first end of the subcooler (50) connected to the condenser (40) and a second end of the subcooler (50) connected to the evaporator. A hot water generator (60) includes a refrigerant pipe (120), the first end of which is connected to the compressor (10), and the second end of which is connected to the second end of the subcooler (50); and The subcooling throttle valve (82) is used to control the subcooling degree of the subcooler (50). When the air conditioning system is in cooling mode, the current opening degree of the subcooling throttle valve (82) is configured to be adjusted according to the temperature of the refrigerant output from the second end of the refrigerant pipe (120). The current opening degree of the subcooling throttle valve (82) is the sum of the initial opening value and the opening adjustment amount, wherein the initial opening value is configured to be obtained based on the difference between the temperature of the refrigerant output by the condenser (40) and the temperature of the refrigerant output by the subcooler (50), and the opening adjustment amount is configured to be obtained based on the difference between the temperature of the refrigerant output by the condenser (40) and the temperature of the refrigerant output by the subcooler (50), the suction superheat of the compressor, the refrigerant temperature output at the second end of the refrigerant pipe, and the temperature of the refrigerant output by the subcooler (50).

2. The air conditioning system according to claim 1, characterized in that, The formula for calculating the opening adjustment amount is: △S=T1-T2*α+β*T3-T 12 Where T1 refers to the difference between the refrigerant temperature output by the condenser (40) and the refrigerant temperature output by the subcooler (50), T2 refers to the suction superheat of the compressor, and T3 refers to the refrigerant temperature output from the second end of the refrigerant pipe (120). 12 This refers to the temperature of the refrigerant output by the subcooler (50), where α and β are constants.

3. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes a controller that is signal-connected to the subcooling throttle valve (82) and is configured to adjust the opening of the subcooling throttle valve (82) based on the temperature of the refrigerant output from the second end of the refrigerant pipe (120), the temperature of the refrigerant output from the condenser (40), the temperature of the refrigerant output from the subcooler (50), and the suction superheat of the compressor (10).

4. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes a high-pressure gas pipe connected to the first end of the refrigerant pipe (120), and a high-pressure gas pipe valve (83) is provided on the high-pressure gas pipe.

5. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes a valve assembly (30), through which the compressor (10) is connected to the condenser (40), the hot water generator (60) and the evaporator, and the valve assembly is activated to control the air conditioning system to switch between cooling mode and heating mode.

6. The air conditioning system according to claim 5, characterized in that, The valve assembly (30) includes a first four-way valve (31) and a second four-way valve (32). The first port of the first four-way valve (31) is connected to the exhaust port of the compressor (10), the second port of the first four-way valve (31) is connected to the condenser (40), the third and fourth ports of the first four-way valve (31) are connected to the suction port of the compressor (10), the first port of the second four-way valve (32) is connected to the exhaust port of the compressor (10), the second and third ports of the second four-way valve (32) are connected to the suction port of the compressor (10), and the fourth port of the second four-way valve (32) is connected to the evaporator.

7. A control method for an air conditioning system according to claim 1, characterized in that, Includes the following steps: Obtain the temperature of the refrigerant output from the second end of the refrigerant pipe (120); Adjust the current opening of the subcooling throttle valve (82) according to the temperature of the refrigerant output from the second end of the refrigerant pipe (120).

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