Control method, air conditioning system, control device and storage medium

Abstract

The invention discloses a control method, an air conditioning system, a control device and a storage medium. The control method comprises the steps that the water temperature in the first water inlet pipe is obtained, and the water temperature in the second water inlet pipe is obtained; according to the water temperature in the first water inlet pipe and the water temperature in the second water inlet pipe, the load requirement of the tail end of the air conditioning system is determined; and according to the load requirement, the opening degree of the first throttling assembly, the opening degree of the second throttling assembly or the opening degree of the third throttling assembly is adjusted so that high-temperature chilled water or low-temperature chilled water or high-low-temperature chilled water can be prepared. The evaporation temperature and the outlet superheat degree of the second heat exchanger can be controlled by adjusting the opening degrees of the first throttling assembly and the third throttling assembly. The evaporation temperature and the outlet superheat degree of the third heat exchanger can be controlled by adjusting the opening degree of the second throttling assembly. Through the three throttling assemblies, the outlet superheat degrees of the second heat exchanger and the third heat exchanger can be independently controlled, the evaporation temperatures of the second heat exchanger and the third heat exchanger can be independently controlled, and therefore the energy efficiency of the air conditioning system is improved.

Description

Technical Field

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

[0002] With the continuous development of the air-conditioning industry, users' demands for air-conditioning systems are becoming more and more diversified and refined, especially in the terminal selection of air-conditioning systems. Common terminal forms of air-conditioning systems mainly include fan coil units and radiant panels. Fan coil units mainly transfer energy through air convection heat exchange. Due to its convective heat transfer characteristics, systems using fan coil units usually use low-temperature chilled water as a coolant to achieve effective heat exchange. Radiant panels transfer heat through radiation, which can better meet users' high requirements for indoor environmental comfort.

[0003] If fan coil units and radiation panels are used as the terminals of the air conditioning system, the air conditioning system needs to be able to produce high-temperature chilled water and low-temperature chilled water at the same time. However, in this case, the energy efficiency of the air conditioning system is low. Summary of the invention

[0004] The present invention provides a control method, an air conditioning system, a control device and a storage medium to solve at least one of the above-mentioned technical problems.

[0005] The control method of the embodiment of the present invention is used for an air-conditioning system, the air-conditioning system comprises a first heat exchanger, a second heat exchanger, a third heat exchanger and a compressor connected by a refrigerant pipeline, a first throttling component is arranged between the first heat exchanger and the second heat exchanger, a second throttling component is arranged between the first heat exchanger and the third heat exchanger, a third throttling component is arranged between the second heat exchanger and the compressor, the refrigerant pipeline comprises a first branch and a second branch, the first throttling component, the second heat exchanger and the third throttling component are arranged on the first branch in sequence, the second throttling component and the third heat exchanger are arranged on the second branch in sequence, the first branch is connected in parallel with the second branch, the second heat exchanger is connected with a first water inlet pipe and a first water outlet pipe, the third heat exchanger is connected with a second water inlet pipe and a second water outlet pipe, the first water outlet pipe is used to output high-temperature chilled water, and the second water outlet pipe is used to output low-temperature chilled water, the control method comprises:

[0006] Acquiring the water temperature in the first water inlet pipe, and acquiring the water temperature in the second water inlet pipe;

[0007] According to the water temperature in the first water inlet pipe and the water temperature in the second water inlet pipe, confirming the load demand of the terminal of the air conditioning system, wherein the load demand includes high-temperature chilled water demand, low-temperature chilled water demand and high-low temperature chilled water demand;

[0008] According to the load demand, the opening of the first throttling component, the opening of the second throttling component or the opening of the third throttling component is adjusted to produce high-temperature chilled water, low-temperature chilled water or high-low temperature chilled water.

[0009] The second heat exchanger and the third heat exchanger are respectively arranged on the first branch and the second branch, so that the air conditioning system can only produce high-temperature chilled water, or only produce low-temperature chilled water, or produce high and low-temperature chilled water to meet the needs of two different ends of the fan coil and the radiation plate. The above control method can control the evaporation temperature and outlet superheat of the second heat exchanger by adjusting the opening of the first throttling component and the opening of the third throttling component. The evaporation temperature and outlet superheat of the third heat exchanger can be controlled by adjusting the opening of the second throttling component. In this way, through the three throttling components, not only the outlet superheat of the second heat exchanger and the third heat exchanger can be independently controlled, but also the evaporation temperature of the second heat exchanger and the third heat exchanger can be independently controlled, thereby improving the energy efficiency of the air conditioning system. In addition, since the third throttling component is arranged on the first branch, the third throttling component can ensure that the evaporation pressures of the second heat exchanger and the third heat exchanger are different, so that the evaporation temperature of the second heat exchanger is within a suitable temperature range, so that the heat exchange temperature difference is within a suitable range, thereby improving the heat exchange efficiency of the third heat exchanger, thereby improving the energy efficiency of the air conditioning system.

[0010] In addition, by acquiring the water temperature in the first water inlet pipe and the second water inlet pipe, the load demand at the end of the air-conditioning system can be accurately identified, which serves as a basis for preparing chilled water of different temperatures.

[0011] In some embodiments, the step of adjusting the opening of the first throttling component, the opening of the second throttling component, or the opening of the third throttling component according to the load demand to produce high-temperature chilled water, low-temperature chilled water, or high-low temperature chilled water includes:

[0012] When the load demand at the end of the air-conditioning system is a high-temperature chilled water demand, the opening of the third throttling component is adjusted to the maximum, the opening of the first throttling component is adjusted, and the second throttling component is controlled to be closed to produce the high-temperature chilled water.

[0013] In some embodiments, when the load demand at the end of the air-conditioning system is a high-temperature chilled water demand, the step of adjusting the opening of the third throttling component to the maximum, adjusting the opening of the first throttling component, and controlling the second throttling component to close to produce the high-temperature chilled water includes:

[0014] Obtaining an outlet superheat of the second heat exchanger;

[0015] The opening degree of the first throttling component is adjusted according to the outlet superheat of the second heat exchanger.

[0016] In some embodiments, the step of adjusting the opening of the first throttling component, the opening of the second throttling component, or the opening of the third throttling component according to the load demand to produce high-temperature chilled water, low-temperature chilled water, or high-low temperature chilled water includes:

[0017] When the load demand at the end of the air-conditioning system is low-temperature chilled water, the first throttling component is controlled to be closed, the opening of the third throttling component is adjusted to the maximum, and the opening of the second throttling component is adjusted to produce the low-temperature chilled water.

[0018] In some embodiments, when the load demand at the end of the air-conditioning system is low-temperature chilled water, the step of controlling the first throttling component to close, adjusting the opening of the third throttling component to the maximum, and adjusting the opening of the second throttling component to produce the low-temperature chilled water includes:

[0019] Obtaining an outlet superheat degree of the third heat exchanger;

[0020] The opening degree of the second throttling component is adjusted according to the outlet superheat degree of the third heat exchanger.

[0021] In some embodiments, the step of adjusting the opening of the first throttling component, the opening of the second throttling component, or the opening of the third throttling component according to the load demand to produce high-temperature chilled water, low-temperature chilled water, or high-low temperature chilled water includes:

[0022] When the load demand at the end of the air-conditioning system is high and low temperature chilled water, the opening of the first throttling component, the opening of the second throttling component and the opening of the third throttling component are adjusted to produce the high and low temperature chilled water.

[0023] In some embodiments, when the load demand at the end of the air-conditioning system is high and low temperature chilled water, the step of adjusting the opening of the first throttling component, the opening of the second throttling component and the opening of the third throttling component to produce high and low temperature chilled water includes:

[0024] Obtaining the outlet superheat of the second heat exchanger and the end temperature difference of the second heat exchanger, and obtaining the outlet superheat of the third heat exchanger;

[0025] The opening of the first throttling component is adjusted according to the outlet superheat of the second heat exchanger, the opening of the third throttling component is adjusted according to the end temperature difference of the second heat exchanger, and the opening of the second throttling component is adjusted according to the outlet superheat of the third heat exchanger.

[0026] In some embodiments, the step of adjusting the opening of the first throttling component according to the outlet superheat of the second heat exchanger and adjusting the opening of the third throttling component according to the end temperature difference of the second heat exchanger includes:

[0027] When the outlet superheat of the second heat exchanger is greater than a first preset value and the end temperature difference of the second heat exchanger is greater than a second preset value, the opening of the first throttling component is controlled to remain unchanged, and the opening of the third throttling component is reduced;

[0028] When the outlet superheat of the second heat exchanger is less than or equal to a first preset value and the end temperature difference of the second heat exchanger is less than or equal to a second preset value, repeat the steps of confirming the load demand at the end of the air-conditioning system according to the water temperature in the first water inlet pipe and the water temperature in the second water inlet pipe, wherein the load demand includes a high-temperature chilled water demand, a low-temperature chilled water demand and high and low-temperature chilled water demands.

[0029] In some embodiments, the control method further comprises:

[0030] When the outlet superheat of the second heat exchanger is less than or equal to a third preset value, stop reducing the opening of the third throttling component and simultaneously reduce the opening of the first throttling component;

[0031] When the outlet superheat of the second heat exchanger is greater than the third preset value, the opening of the first throttling component is controlled to remain unchanged, and the opening of the third throttling component is reduced.

[0032] In some embodiments, the control method further comprises:

[0033] Within a preset time, obtaining a change in the temperature difference of the outlet superheat of the second heat exchanger, and obtaining a change in the end temperature difference of the second heat exchanger;

[0034] When the outlet superheat of the second heat exchanger is less than or equal to the first change value, and the end temperature difference of the second heat exchanger is less than or equal to the second change value, the openings of the first throttling component and the third throttling component are kept unchanged;

[0035] When the outlet superheat of the second heat exchanger is greater than the first change value and the end temperature difference of the second heat exchanger is greater than the second change value, repeat the steps of confirming the load demand at the end of the air-conditioning system according to the water temperature in the first water inlet pipe and the water temperature in the second water inlet pipe, wherein the load demand includes high-temperature chilled water demand, low-temperature chilled water demand and high and low-temperature chilled water demand.

[0036] In some embodiments, the step of confirming the load demand of the terminal of the air-conditioning system according to the water temperature in the first water inlet pipe and the water temperature in the second water inlet pipe, wherein the load demand includes a high-temperature chilled water demand, a low-temperature chilled water demand, and a high-low-temperature chilled water demand, comprises:

[0037] When the water temperature in the first water inlet pipe is greater than the first preset water temperature, and the water temperature in the second water inlet pipe is less than or equal to the second preset water temperature, confirming that the load demand is a high chilled water demand;

[0038] When the water temperature in the first water inlet pipe is greater than the second preset water temperature and the water temperature in the first water inlet pipe is less than or equal to the first preset water temperature, confirming that the load demand is a low chilled water demand;

[0039] When the water temperature in the first water inlet pipe is greater than the first preset water temperature, and the water temperature in the second water inlet pipe is greater than the second preset water temperature, it is confirmed that the load demand is a high-low chilled water demand.

[0040] An air-conditioning system according to an embodiment of the present invention comprises a first heat exchanger, a second heat exchanger, a third heat exchanger, and a compressor connected by a refrigerant pipeline, a first throttling component is provided between the first heat exchanger and the second heat exchanger, a second throttling component is provided between the first heat exchanger and the third heat exchanger, a third throttling component is provided between the second heat exchanger and the compressor, the refrigerant pipeline comprises a first branch and a second branch, the first throttling component, the second heat exchanger and the third throttling component are sequentially arranged on the first branch, the second throttling component and the third heat exchanger are sequentially arranged on the second branch, the first branch is connected in parallel with the second branch, a first water inlet pipe and a first water outlet pipe are connected to the second heat exchanger, a second water inlet pipe and a second water outlet pipe are connected to the third heat exchanger, the first water outlet pipe is used to output high-temperature chilled water, and the second water outlet pipe is used to output low-temperature chilled water, the air-conditioning system also comprises a controller and a memory, the memory is used to store a computer program, and the controller is used to execute the computer program to realize the control method described in any of the above embodiments.

[0041] In certain embodiments, the air conditioning system further comprises a gas-liquid separator, one end of the gas-liquid separator is connected to the compressor, and the other end of the gas-liquid separator is connected to the third throttling assembly and the third heat exchanger.

[0042] A control device according to an embodiment of the present invention is used for an air-conditioning system, the air-conditioning system comprising a first heat exchanger, a second heat exchanger, a third heat exchanger and a compressor connected by a refrigerant pipeline, a first throttling component is provided between the first heat exchanger and the second heat exchanger, a second throttling component is provided between the first heat exchanger and the third heat exchanger, a third throttling component is provided between the second heat exchanger and the compressor, the refrigerant pipeline comprises a first branch and a second branch, the first throttling component, the second heat exchanger and the third throttling component are sequentially arranged on the first branch, the second throttling component and the third heat exchanger are sequentially arranged on the second branch, the first branch is connected in parallel with the second branch, the second heat exchanger is connected with a first water inlet pipe and a first water outlet pipe, the third heat exchanger is connected with a second water inlet pipe and a second water outlet pipe, the first water outlet pipe is used to output high-temperature chilled water, and the second water outlet pipe is used to output low-temperature chilled water, the control device comprises:

[0043] an acquisition module, the acquisition module being used to acquire the water temperature in the first water inlet pipe and the water temperature in the second water inlet pipe;

[0044] A confirmation module, the confirmation module is used to confirm the load demand of the terminal of the air-conditioning system according to the water temperature in the first water inlet pipe and the water temperature in the second water inlet pipe, the load demand including high-temperature chilled water demand, low-temperature chilled water demand and high-low temperature chilled water demand;

[0045] A regulating module is used to adjust the opening of the first throttling component, the opening of the second throttling component or the opening of the third throttling component according to the load demand to produce high-temperature chilled water, low-temperature chilled water or high-low temperature chilled water.

[0046] A non-volatile computer-readable storage medium of computer-executable instructions according to an embodiment of the present invention is characterized in that when the computer-executable instructions are executed by one or more processors, the processors execute the control method described in any of the above embodiments.

[0047] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0049] Figure 1 is a schematic diagram of an air conditioning system according to an embodiment of the present invention;

[0050] Figure 2is a flow chart of a control method according to an embodiment of the present invention;

[0051] Figure 3 is another schematic diagram of an air conditioning system according to an embodiment of the present invention;

[0052] Figure 4 is a schematic diagram of a control device according to an embodiment of the present invention;

[0053] Figure 5 is another schematic flow chart of the control method according to an embodiment of the present invention;

[0054] Figure 6 is another flow chart of the control method according to the embodiment of the present invention;

[0055] Figure 7 is another flow chart of the control method according to the embodiment of the present invention;

[0056] Figure 8 is another flow chart of the control method according to the embodiment of the present invention;

[0057] Fig. 9 is another flow chart of the control method according to the embodiment of the present invention;

[0058] Fig.10 is another flow chart of the control method according to the embodiment of the present invention;

[0059] Fig.11 is another flow chart of the control method according to the embodiment of the present invention;

[0060] Fig.12 is another flow chart of the control method according to the embodiment of the present invention;

[0061] Fig.13 is another flow chart of the control method according to the embodiment of the present invention;

[0062] Fig.14 is another flow chart of the control method according to the embodiment of the present invention;

[0063] Fig.15 is another flow chart of the control method according to the embodiment of the present invention;

[0064] Fig.16 It is another flowchart of the control method according to the embodiment of the present invention.

[0065] Description of reference numerals:

[0066] Air conditioning system 100; refrigerant pipeline 10; first heat exchanger 20; second heat exchanger 30; third heat exchanger 40; compressor 50; first throttling component 60; second throttling component 70; third throttling component 80; first branch 11; second branch 12; first water inlet pipe 21; first water outlet pipe 22; second water inlet pipe 23; second water outlet pipe 24; controller 101; memory 102; gas-liquid separator 90; control device 200; acquisition module 201; confirmation module 202; adjustment module 203; circulation module 204. DETAILED DESCRIPTION

[0067] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0068] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0069] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0071] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0072] Please refer to Figure 1 and Figure 2 The control method of the embodiment of the present invention is used for an air conditioning system 100, which includes a first heat exchanger 20, a second heat exchanger 30, a third heat exchanger 40 and a compressor 50 connected by a refrigerant pipeline 10, a first throttling component 60 is provided between the first heat exchanger 20 and the second heat exchanger 30, a second throttling component 70 is provided between the first heat exchanger 20 and the third heat exchanger 40, and a third throttling component 80 is provided between the second heat exchanger 30 and the compressor 50, and the refrigerant pipeline 10 includes a first branch 11 and a second branch 12, and the first branch 13 is provided between the first heat exchanger 20 and the second heat exchanger 30. A throttling assembly 60, a second heat exchanger 30 and a third throttling assembly 80 are sequentially arranged on the first branch 11, a second throttling assembly 70 and a third heat exchanger 40 are sequentially arranged on the second branch 12, the first branch 11 and the second branch 12 are connected in parallel, the second heat exchanger 30 is connected with a first water inlet pipe 21 and a first water outlet pipe 22, the third heat exchanger 40 is connected with a second water inlet pipe 23 and a second water outlet pipe 24, the first water outlet pipe 22 is used to output high-temperature chilled water, and the second water outlet pipe 24 is used to output low-temperature chilled water, and the control method includes:

[0073] S10, obtaining the water temperature in the first water inlet pipe 21, and obtaining the water temperature in the second water inlet pipe 23;

[0074] S20, confirming the load demand of the end of the air conditioning system 100 according to the water temperature in the first water inlet pipe 21 and the water temperature in the second water inlet pipe 23, the load demand including high-temperature chilled water demand, low-temperature chilled water demand and high-low temperature chilled water demand;

[0075] S30, according to the load demand, adjusting the opening of the first throttling component 60, the opening of the second throttling component 70 or the opening of the third throttling component 80 to produce high-temperature chilled water, low-temperature chilled water or high-low temperature chilled water.

[0076] Please refer to Figure 2 and Figure 3 The air conditioning system 100 of the embodiment of the present invention further includes a controller 101 and a memory 102, the memory 102 is used to store computer programs, the controller 101 is used to obtain the water temperature in the first water inlet pipe 21, and the water temperature in the second water inlet pipe 23; and is used to confirm the load demand of the end of the air conditioning system 100 according to the water temperature in the first water inlet pipe 21 and the water temperature in the second water inlet pipe 23, the load demand includes the high-temperature chilled water demand, the low-temperature chilled water demand and the high-low temperature chilled water demand; and is used to adjust the opening of the first throttling component 60, the opening of the second throttling component 70 or the opening of the third throttling component 80 according to the load demand to produce high-temperature chilled water, low-temperature chilled water or high-low temperature chilled water.

[0077] Please refer to Figure 2 and Figure 4 . The control device 200 of the embodiment of the present invention includes an acquisition module 201, a confirmation module 202 and an adjustment module 203. The acquisition module 201 is used to obtain the water temperature in the first water inlet pipe 21 and the water temperature in the second water inlet pipe 23; the confirmation module 202 is used to confirm the load demand at the end of the air-conditioning system 100 according to the water temperature in the first water inlet pipe 21 and the water temperature in the second water inlet pipe 23, and the load demand includes high-temperature chilled water demand, low-temperature chilled water demand and high and low-temperature chilled water demand; the adjustment module 203 is used to adjust the opening of the first throttling component 60, the opening of the second throttling component 70 or the opening of the third throttling component 80 according to the load demand to produce high-temperature chilled water, low-temperature chilled water or high and low-temperature chilled water.

[0078] The second heat exchanger 30 and the third heat exchanger 40 are respectively arranged on the first branch 11 and the second branch 12, so that the air-conditioning system 100 can produce only high-temperature chilled water, or only low-temperature chilled water, or high and low-temperature chilled water to meet the needs of two different ends of the fan coil unit and the radiation panel.

[0079] The control method described above can control the evaporation temperature and outlet superheat of the second heat exchanger 30 by adjusting the opening of the first throttling assembly 60 and the opening of the third throttling assembly 80. The evaporation temperature and outlet superheat of the third heat exchanger 40 can be controlled by adjusting the opening of the second throttling assembly 70. In this way, through the three throttling assemblies, not only the outlet superheat of the second heat exchanger 30 and the third heat exchanger 40 can be independently controlled, but also the evaporation temperature of the second heat exchanger 30 and the third heat exchanger 40 can be independently controlled, thereby improving the energy efficiency of the air conditioning system 100.

[0080] Furthermore, since the third throttling component 80 is arranged on the first branch 11, the third throttling component 80 can ensure that the evaporation pressures of the second heat exchanger 30 and the third heat exchanger 40 are different, so that the evaporation temperature of the second heat exchanger 30 is within a suitable temperature range, thereby making the heat exchange temperature difference within a suitable range, thereby improving the heat exchange efficiency of the third heat exchanger 40, thereby improving the energy efficiency of the air-conditioning system 100.

[0081] In addition, by acquiring the water temperature in the first water inlet pipe 21 and the second water inlet pipe 23, the load demand at the end of the air-conditioning system 100 can be accurately identified, which serves as a basis for preparing chilled water of different temperatures.

[0082] Specifically, the refrigerant pipeline 10 can be a channel for refrigerant circulation. The first heat exchanger 20 can be a condenser. The second heat exchanger 30 and the third heat exchanger 40 can both be evaporators. The second heat exchanger 30 can be a high-temperature chilled water heat exchanger, and the second heat exchanger 30 can be used to produce high-temperature chilled water. The third heat exchanger 40 can be a low-temperature chilled water heat exchanger, and the third heat exchanger 40 is used to produce low-temperature chilled water.

[0083] Among them, high-temperature chilled water refers to chilled water with a temperature greater than or equal to 12°C and less than or equal to 20°C, and low-temperature chilled water refers to chilled water with a temperature greater than or equal to 5°C and less than 12°C.

[0084] The throttling assembly can be an expansion valve or a throttling valve. The throttling assembly is used to control the flow of the refrigerant flowing into the heat exchanger, thereby affecting the cooling capacity of the heat exchanger. The first throttling assembly 60 is used to control the flow of the refrigerant flowing to the second heat exchanger 30. The second throttling assembly 70 is used to control the flow of the refrigerant flowing to the third heat exchanger 40.

[0085] The third throttling assembly 80 is used to control the flow rate of the refrigerant returning from the second heat exchanger 30 to the compressor 50. The third throttling assembly 80 can perform secondary throttling on the refrigerant flowing out of the second heat exchanger 30. It can be understood that, since the outlet water temperatures of the second heat exchanger 30 and the third heat exchanger 40 are different, if the third throttling assembly 80 is not provided, the evaporation pressures downstream of the second heat exchanger 30 and the third heat exchanger 40 are equivalent, which will cause the evaporation temperature of the second heat exchanger 30 to be equivalent to the evaporation temperature of the third heat exchanger 40, thereby reducing the heat exchange efficiency of the second heat exchanger 30.

[0086] By setting the third throttling component 80, the evaporation pressure of the second heat exchanger 30 can be independently controlled by the third throttling component 80, so that the evaporation pressures of the second heat exchanger 30 and the third heat exchanger 40 are different, so that the evaporation temperature of the second heat exchanger 30 is within a suitable temperature range, so that the heat exchange temperature difference is within a suitable range, thereby improving the heat exchange efficiency of the second heat exchanger 30, thereby improving the energy efficiency of the air-conditioning system 100.

[0087] After the air conditioning system 100 is turned on, when the load demand at the end of the air conditioning system 100 is high and low temperature chilled water, or when the load demand at the end of the air conditioning system 100 is a case where both high temperature chilled water and low temperature chilled water are required. The evaporation temperature requirements of the third heat exchanger 40 and the second heat exchanger 30 are different. For example, if the outlet water temperature requirement of the second heat exchanger 30 is 18°C, the outlet water temperature requirement of the third heat exchanger 40 is 7°C. At this time, the evaporation temperature required by the second heat exchanger 30 is 15°C, and the evaporation temperature required by the third heat exchanger 40 is 5°C. If the third throttling component 80 is not provided, the evaporation pressures of the second heat exchanger 30 and the third heat exchanger 40 will be equivalent, and the evaporation temperature of the second heat exchanger 30 may also be 5°C, which will cause the evaporation temperature of the second heat exchanger 30 to not match the required evaporation temperature, resulting in low heat exchange efficiency. By providing the third throttling assembly 80 , the evaporation temperature of the second heat exchanger 30 can be increased to 15° C. to match the required evaporation temperature of the second heat exchanger 30 , thereby improving the heat exchange efficiency.

[0088] The first branch 11 and the second branch 12 can constitute a parallel part of the refrigerant pipeline 10, allowing the refrigerant to flow to different heat exchangers as needed. On the first branch 11, the output end of the first throttling assembly 60 is connected to the input end of the second heat exchanger 30; the output end of the second heat exchanger 30 is connected to the input end of the third throttling assembly 80. On the second branch 12, the output end of the second throttling assembly 70 is connected to the input end of the third heat exchanger 40.

[0089] The water temperature in the water inlet pipe can be detected by a temperature sensor installed on the water inlet pipe, such as a thermocouple or a resistance temperature detector.

[0090] After being compressed by the compressor 50, the refrigerant enters the first heat exchanger 20. After being condensed, the refrigerant is divided into two parts. One part of the refrigerant enters the first branch 11, passes through the first throttling assembly 60, obtains a high-temperature and high-pressure refrigerant liquid, and then enters the second heat exchanger 30 for heat exchange. The refrigerant will exchange heat with the chilled water in the coil of the second heat exchanger 30, thereby producing high-temperature chilled water. After the refrigerant flows out of the second heat exchanger 30, it will pass through the third throttling assembly 80 for secondary throttling. The other part of the refrigerant enters the second branch 12, passes through the second throttling assembly 70, obtains a low-temperature and low-pressure refrigerant liquid, and then enters the third heat exchanger 40 for heat exchange. The refrigerant will exchange heat with the chilled water in the coil of the third heat exchanger 40, thereby producing low-temperature chilled water. Then, the refrigerant on the first branch 11 and the second branch 12 returns to the compressor 50, and the compressed refrigerant vapor enters the first heat exchanger 20 again to start the next cycle.

[0091] It can be understood that when the first throttling assembly 60 and the third throttling assembly 80 are turned on, high-temperature chilled water can be produced through the second heat exchanger 30. When the second throttling assembly 70 is turned on, low-temperature chilled water can be produced through the third heat exchanger 40. When the first throttling assembly 60, the second throttling assembly 70 and the third throttling assembly 80 are all turned on, high-temperature chilled water can be produced through the second heat exchanger 30 and low-temperature chilled water can be produced through the third heat exchanger 40, or high-temperature and low-temperature chilled water can be produced, or high-temperature chilled water and low-temperature chilled water can be produced at the same time.

[0092] The end of the air conditioning system 100 includes a radiation panel and a fan coil unit. High-temperature chilled water is delivered to the radiation panel, and low-temperature chilled water is delivered to the fan coil unit.

[0093] Please refer to Figure 1 , Figure 5 and Figure 6 In some embodiments, according to load demand, the step of adjusting the opening of the first throttling component 60, the opening of the second throttling component 70 or the opening of the third throttling component 80 to produce high-temperature chilled water, low-temperature chilled water or high-low temperature chilled water (step S30) includes:

[0094] S31, when the load demand at the end of the air-conditioning system 100 is a high-temperature chilled water demand, the opening of the third throttling component 80 is adjusted to the maximum, the opening of the first throttling component 60 is adjusted, and the second throttling component 70 is controlled to be closed to produce high-temperature chilled water.

[0095] Please refer to Figure 3 , Figure 5 and Figure 6In some embodiments, the controller 101 is used to adjust the opening of the third throttling component 80 to the maximum, adjust the opening of the first throttling component 60, and control the second throttling component 70 to close when the load demand at the end of the air-conditioning system 100 is a high-temperature chilled water demand, so as to produce high-temperature chilled water.

[0096] Please refer to Figure 4 , Figure 5 and Figure 6 In some embodiments, the regulating module 203 is used to adjust the opening of the third throttling component 80 to the maximum, adjust the opening of the first throttling component 60, and control the second throttling component 70 to be closed to produce high-temperature chilled water when the load demand at the end of the air-conditioning system 100 is a high-temperature chilled water demand.

[0097] In this way, the first throttling component 60 is adjusted, so that the refrigerant can exchange heat with the water in the coil of the second heat exchanger 30, so that high-temperature chilled water can be produced. By closing the second throttling component 70, adjusting the first throttling component 60, and adjusting the opening of the third throttling component 80 to the maximum, the distribution of the refrigerant in the air-conditioning system 100 can be optimized, ensuring that more refrigerant flows to the second heat exchanger 30, thereby improving the efficiency of producing high-temperature chilled water.

[0098] In addition, when the load demand at the end of the air-conditioning system 100 is a high-temperature chilled water demand, the first throttling component 60 can independently control the outlet superheat of the second heat exchanger 30. At this time, adjusting the opening of the third throttling component 80 to the maximum can improve the heat exchange efficiency of the second heat exchanger 30.

[0099] Please refer to Figure 1 , Figure 5 and Figure 7 In some embodiments, when the load demand at the end of the air conditioning system 100 is a high-temperature chilled water demand, the step of adjusting the opening of the third throttling component 80 to the maximum, adjusting the opening of the first throttling component 60, and controlling the second throttling component 70 to close to produce high-temperature chilled water (step S31) includes:

[0100] S310, obtaining the outlet superheat of the second heat exchanger 30;

[0101] S311, adjusting the opening of the first throttling assembly 60 according to the outlet superheat of the second heat exchanger 30.

[0102] Please refer to Figure 3 , Figure 5 and Figure 7 In certain embodiments, the controller 101 is used to obtain the outlet superheat of the second heat exchanger 30 , and to adjust the opening of the first throttling assembly 60 according to the outlet superheat of the second heat exchanger 30 .

[0103] Please refer to Figure 4 , Figure 5 and Figure 7 In some embodiments, the acquisition module 201 is used to acquire the outlet superheat of the second heat exchanger 30 ; the adjustment module 203 is used to adjust the opening of the first throttling component 60 according to the outlet superheat of the second heat exchanger 30 .

[0104] In this way, the outlet superheat of the second heat exchanger 30 reflects the evaporation temperature of the refrigerant in the second heat exchanger 30. By adjusting the opening of the first throttling assembly 60 and the third throttling assembly 80, the flow rate of the refrigerant can be controlled, thereby ensuring that the outlet superheat of the second heat exchanger 30 is within a suitable range, which can effectively prevent the compressor 50 from being liquid-hammered due to the outlet superheat of the second heat exchanger 30 being too low, and can also avoid the problem of the compressor 50 being too high in exhaust temperature due to the outlet superheat of the second heat exchanger 30 being too high.

[0105] Specifically, the outlet superheat of the second heat exchanger 30 is the difference between the actual temperature of the refrigerant at the outlet of the second heat exchanger 30 and its evaporation temperature, reflecting the degree of evaporation of the refrigerant in the second heat exchanger 30. As the evaporation temperature increases, the outlet superheat decreases. In the case where the outlet superheat of the second heat exchanger 30 is too large, the opening of the first throttling component 60 can be increased, and the opening of the third throttling component 80 can be decreased; in the case where the outlet superheat of the second heat exchanger 30 is too small, the opening of the first throttling component 60 can be decreased, and the opening of the third throttling component 80 can be increased.

[0106] Please refer to Figure 1 , Figure 5 and Figure 8 In some embodiments, according to load demand, the step of adjusting the opening of the first throttling component 60, the opening of the second throttling component 70 or the opening of the third throttling component 80 to produce high-temperature chilled water, low-temperature chilled water or high-low temperature chilled water (step S30) includes:

[0107] S32, when the load demand at the end of the air-conditioning system 100 is low-temperature chilled water, the first throttling component 60 is controlled to be closed, the opening of the third throttling component 80 is adjusted to the maximum, and the opening of the second throttling component 70 is adjusted to produce low-temperature chilled water.

[0108] Please refer to Figure 3 , Figure 5 and Figure 8 In some embodiments, the controller 101 is used to control the first throttling component 60 to close, adjust the opening of the third throttling component 80 to the maximum, and adjust the opening of the second throttling component 70 to produce low-temperature chilled water when the load demand at the end of the air-conditioning system 100 is low-temperature chilled water.

[0109] Please refer to Figure 4 , Figure 5 and Figure 8 In some embodiments, the regulating module 203 is used to control the first throttling component 60 to close, adjust the opening of the third throttling component 80 to the maximum, and adjust the opening of the second throttling component 70 to produce low-temperature chilled water when the load demand at the end of the air-conditioning system 100 is low-temperature chilled water.

[0110] In this way, the opening of the second throttling assembly 70 is adjusted, so that the refrigerant can exchange heat with the water in the coil of the third heat exchanger 40, so that low-temperature chilled water can be produced. By closing the first throttling assembly 60, the distribution of the refrigerant in the air-conditioning system 100 can be optimized, ensuring that more refrigerant flows to the third heat exchanger 40, thereby improving the efficiency of producing low-temperature chilled water.

[0111] When the load demand at the end of the air conditioning system 100 is low-temperature chilled water, refrigerant may remain in the second heat exchanger 30. Therefore, by adjusting the opening of the third throttling component 80 to the maximum, the refrigerant enters the refrigerant pipeline 10 and is finally compressed by the compressor 50, thereby improving the energy efficiency of the air conditioning system 100.

[0112] Please refer to Figure 1 , Figure 5 and Fig. 9 In some embodiments, when the load demand at the end of the air conditioning system 100 is low-temperature chilled water, the step of controlling the first throttling component 60 to close, adjusting the opening of the third throttling component 80 to the maximum, and adjusting the opening of the second throttling component 70 to produce low-temperature chilled water (step S32) includes:

[0113] S320, obtaining the outlet superheat of the third heat exchanger 40;

[0114] S321, adjusting the opening of the second throttling assembly 70 according to the outlet superheat of the third heat exchanger 40.

[0115] Please refer to Figure 3 , Figure 5 and Fig. 9 In some embodiments, the controller 101 is used to obtain the outlet superheat of the third heat exchanger 40 ; the regulating module 203 is used to adjust the opening of the second throttling assembly 70 according to the outlet superheat of the third heat exchanger 40 .

[0116] Please refer to Figure 4 , Figure 5 and Fig. 9 In some embodiments, the acquisition module 201 is used to acquire the outlet superheat of the third heat exchanger 40 ; the adjustment module 203 is used to adjust the opening of the second throttling assembly 70 according to the outlet superheat of the third heat exchanger 40 .

[0117] In this way, the outlet superheat of the third heat exchanger 40 reflects the evaporation temperature of the refrigerant in the third heat exchanger 40. By adjusting the opening of the second throttling assembly 70, the flow rate of the refrigerant can be controlled, thereby ensuring that the outlet superheat of the third heat exchanger 40 is within a suitable range, which can effectively prevent the compressor 50 from being liquid-hammered due to the outlet superheat of the third heat exchanger 40 being too low, and can also avoid the problem of the compressor 50 being too high in exhaust temperature due to the outlet superheat of the third heat exchanger 40 being too high.

[0118] Specifically, the outlet superheat of the third heat exchanger 40 is the difference between the actual temperature of the refrigerant at the outlet of the third heat exchanger 40 and its evaporation temperature, reflecting the evaporation degree of the refrigerant in the third heat exchanger 40. When the outlet superheat of the third heat exchanger 40 is too large, the opening of the second throttling assembly 70 can be increased; when the outlet superheat of the third heat exchanger 40 is too small, the opening of the second throttling assembly 70 can be decreased.

[0119] Please refer to Figure 1 , Figure 5 and Fig.10 In some embodiments, according to load demand, the step of adjusting the opening of the first throttling component 60, the opening of the second throttling component 70 or the opening of the third throttling component 80 to produce high-temperature chilled water, low-temperature chilled water or high-low temperature chilled water (step S30) includes:

[0120] S33, when the load demand at the end of the air-conditioning system 100 is high and low temperature chilled water, adjust the opening of the first throttling component 60, the opening of the second throttling component 70 and the opening of the third throttling component 80 to produce high and low temperature chilled water.

[0121] Please refer to Figure 3 , Figure 5 and Fig.10 In some embodiments, the controller 101 is used to adjust the opening of the first throttling component 60, the opening of the second throttling component 70 and the opening of the third throttling component 80 to produce high and low temperature chilled water when the load demand at the end of the air conditioning system 100 is high and low temperature chilled water.

[0122] Please refer to Figure 4 , Figure 5 and Fig.10 In some embodiments, the regulating module 203 is used to regulate the opening of the first throttling component 60, the opening of the second throttling component 70 and the opening of the third throttling component 80 to produce high and low temperature chilled water when the load demand at the end of the air conditioning system 100 is high and low temperature chilled water.

[0123] In this way, by simultaneously adjusting the opening of the first throttling component 60, the second throttling component 70 and the third throttling component 80, the refrigerant can be heat exchanged through the second heat exchanger 30 and the third heat exchanger 40 at the same time, so that the refrigerant can exchange heat with the water in the coil of the second heat exchanger 30 and the coil of the third heat exchanger 40 to produce high and low temperature chilled water.

[0124] Please refer to Figure 1 and Fig.11 In some embodiments, when the load demand at the end of the air conditioning system 100 is high and low temperature chilled water, the step of adjusting the opening of the first throttling component 60, the opening of the second throttling component 70 and the opening of the third throttling component 80 to produce high and low temperature chilled water (step S33) includes:

[0125] S330, obtaining the outlet superheat of the second heat exchanger 30 and the end temperature difference of the second heat exchanger 30, and obtaining the outlet superheat of the third heat exchanger 40;

[0126] S331, adjust the opening of the first throttling assembly 60 according to the outlet superheat of the second heat exchanger 30, adjust the opening of the third throttling assembly 80 according to the end temperature difference of the second heat exchanger 30, and adjust the opening of the second throttling assembly 70 according to the outlet superheat of the third heat exchanger 40.

[0127] Please refer to Figure 3 and Fig.11 In some embodiments, the controller 101 is used to obtain the outlet superheat of the second heat exchanger 30 and the end temperature difference of the second heat exchanger 30, and obtain the outlet superheat of the third heat exchanger 40; adjust the opening of the first throttling component 60 according to the outlet superheat of the second heat exchanger 30, adjust the opening of the third throttling component 80 according to the end temperature difference of the second heat exchanger 30, and adjust the opening of the second throttling component 70 according to the outlet superheat of the third heat exchanger 40.

[0128] Please refer to Figure 4 and Fig.11 In some embodiments, the acquisition module 201 is used to acquire the outlet superheat of the second heat exchanger 30 and the end temperature difference of the second heat exchanger 30, and acquire the outlet superheat of the third heat exchanger 40; the adjustment module 203 is used to adjust the opening of the first throttling component 60 according to the outlet superheat of the second heat exchanger 30, and adjust the opening of the third throttling component 80 according to the end temperature difference of the second heat exchanger 30, and adjust the opening of the second throttling component 70 according to the outlet superheat of the third heat exchanger 40.

[0129] In this way, the outlet superheat of the second heat exchanger 30 is controlled by the opening of the first throttling assembly 60, and the end temperature difference of the second heat exchanger 30 is controlled by the third throttling assembly 80. In this way, the evaporation temperature of the second heat exchanger 30 is not affected by the third heat exchanger 40, and the third throttling assembly 80 can ensure that the evaporation temperature of the second heat exchanger 30 is within a suitable range, so that the heat exchange temperature difference of the second heat exchanger 30 is within a suitable range, thereby improving the heat exchange efficiency of the second heat exchanger 30, and thus improving the energy efficiency of the air conditioning system 100.

[0130] The outlet superheat of the third heat exchanger 40 is controlled by the second throttling assembly 70 so that the evaporation temperature of the third heat exchanger 40 can be within a suitable range, thereby enabling the heat exchange temperature difference of the third heat exchanger 40 to be within a suitable range, thereby improving the heat exchange efficiency of the third heat exchanger 40 and thereby improving the energy efficiency of the air-conditioning system 100.

[0131] Specifically, the end temperature difference of the second heat exchanger 30 refers to the difference between the water temperature in the first water outlet pipe 22 and the evaporation temperature of the second heat exchanger 30, which reflects the heat exchange efficiency of the second heat exchanger 30. Adjusting the opening of the third throttling assembly 80 can adjust the evaporation temperature of the second heat exchanger 30, thereby adjusting the end temperature difference of the second heat exchanger 30. When the evaporation temperature of the second heat exchanger 30 is high, the opening of the third throttling assembly 80 can be increased. When the evaporation temperature of the second heat exchanger 30 is too low, the opening of the third throttling assembly 80 can be reduced.

[0132] Please refer to Figure 1 and Fig.12 In some embodiments, the step of adjusting the opening of the first throttling assembly 60 according to the outlet superheat of the second heat exchanger 30 and adjusting the opening of the third throttling assembly 80 according to the end temperature difference of the second heat exchanger 30 (step S331) includes:

[0133] S3310, when the outlet superheat of the second heat exchanger 30 is greater than the first preset value and the end temperature difference of the second heat exchanger 30 is greater than the second preset value, the opening of the first throttling component 60 is controlled to remain unchanged, and the opening of the third throttling component 80 is reduced.

[0134] S3311, when the outlet superheat of the second heat exchanger 30 is less than or equal to the first preset value, and the end temperature difference of the second heat exchanger 30 is less than or equal to the second preset value, repeat the steps of confirming the load demand at the end of the air-conditioning system 100 according to the water temperature in the first water inlet pipe 21 and the water temperature in the second water inlet pipe 23, the load demand including high-temperature chilled water demand, low-temperature chilled water demand and high and low-temperature chilled water demand.

[0135] Please refer to Figure 3 and Fig.12In some embodiments, the controller 101 is used to control the opening of the first throttling component 60 to remain unchanged and reduce the opening of the third throttling component 80 when the outlet superheat of the second heat exchanger 30 is greater than the first preset value and the end temperature difference of the second heat exchanger 30 is greater than the second preset value; and is used to repeat the steps of confirming the load demand of the end of the air-conditioning system 100 according to the water temperature in the first water inlet pipe 21 and the water temperature in the second water inlet pipe 23 when the outlet superheat of the second heat exchanger 30 is less than or equal to the first preset value and the end temperature difference of the second heat exchanger 30 is less than or equal to the second preset value, and the load demand includes the high-temperature chilled water demand, the low-temperature chilled water demand and the high-low temperature chilled water demand.

[0136] Please refer to Figure 4 and Fig.12 In some embodiments, the regulating module 203 is used to control the opening of the first throttling component 60 to remain unchanged and reduce the opening of the third throttling component 80 when the outlet superheat of the second heat exchanger 30 is greater than the first preset value and the end temperature difference of the second heat exchanger 30 is greater than the second preset value; the control device 200 also includes a circulation module 204, and the circulation module 204 is used to repeat the steps of confirming the load demand of the end of the air-conditioning system 100 according to the water temperature in the first water inlet pipe 21 and the water temperature in the second water inlet pipe 23 when the outlet superheat of the second heat exchanger 30 is less than or equal to the first preset value and the end temperature difference of the second heat exchanger 30 is less than or equal to the second preset value. The load demand includes the steps of high-temperature chilled water demand, low-temperature chilled water demand and high-low temperature chilled water demand.

[0137] In this way, when the outlet superheat of the second heat exchanger 30 is greater than the first preset value and the end temperature difference of the second heat exchanger 30 is greater than the second preset value, the exhaust temperature of the compressor 50 is too high. By keeping the opening of the first throttling component 60 unchanged and reducing the opening of the third throttling component 80, the outlet superheat of the second heat exchanger 30 can be reduced, thereby reducing the exhaust temperature of the compressor 50 and improving the reliability of the air conditioning system 100.

[0138] Specifically, the first preset value is a preset temperature value, for example, it may be 5 K. The second preset value is a preset temperature value, for example, it may be 4 K. It should be noted that the numerical values ​​here are only examples for easy understanding and cannot be used as limitations on the embodiments of the present invention.

[0139] The control of the outlet superheat of the second heat exchanger 30 takes precedence over the control of the end temperature difference of the second heat exchanger 30. For example, when the outlet superheat of the second heat exchanger 30 is less than or equal to the first preset value, and the end temperature difference of the second heat exchanger 30 is greater than the second preset value, the openings of the first throttling assembly 60 and the third throttling assembly 80 can be kept unchanged.

[0140] Please refer to Figure 1 and Fig.13 In some embodiments, the control method further comprises:

[0141] S40, when the outlet superheat of the second heat exchanger 30 is less than or equal to the third preset value, stop reducing the opening of the third throttling component 80, and simultaneously reduce the opening of the first throttling component 60;

[0142] S50, when the outlet superheat of the second heat exchanger 30 is greater than the third preset value, the opening of the first throttling component 60 is controlled to remain unchanged, and the opening of the third throttling component 80 is reduced.

[0143] Please refer to Figure 3 and Fig.13 In some embodiments, the controller 101 is used to stop reducing the opening of the third throttling component 80 and simultaneously reduce the opening of the first throttling component 60 when the outlet superheat of the second heat exchanger 30 is less than or equal to the third preset value, and is used to control the opening of the first throttling component 60 to remain unchanged and reduce the opening of the third throttling component 80 when the outlet superheat of the second heat exchanger 30 is greater than the third preset value.

[0144] Please refer to Figure 4 and Fig.13 In some embodiments, the regulating module 203 is used to stop reducing the opening of the third throttling component 80 and simultaneously reduce the opening of the first throttling component 60 when the outlet superheat of the second heat exchanger 30 is less than or equal to the third preset value; and is used to control the opening of the first throttling component 60 to remain unchanged and reduce the opening of the third throttling component 80 when the outlet superheat of the second heat exchanger 30 is greater than the third preset value.

[0145] In this way, when the outlet superheat of the second heat exchanger 30 is less than or equal to the third preset value, there is a risk of liquid hammer in the compressor 50. Therefore, by stopping reducing the opening of the third throttling component 80 and synchronously reducing the opening of the first throttling component 60, the outlet superheat of the second heat exchanger 30 can be increased, thereby reducing the risk of liquid hammer in the compressor 50. When the outlet superheat of the second heat exchanger 30 is greater than the third preset value, the outlet superheat of the second heat exchanger 30 can be reduced by reducing the opening of the third throttling component 80, thereby reducing the exhaust temperature of the compressor 50 and improving the reliability of the air conditioning system 100.

[0146] Specifically, the third preset value is a preset temperature value, for example, it may be 2 K. It should be noted that the numerical values ​​here are only examples for easy understanding and cannot be used as limitations on the embodiments of the present invention.

[0147] Please refer to Figure 1 , Fig.14 and Fig.15 In some embodiments, the control method further comprises:

[0148] S60, obtaining a change in the temperature difference of the outlet superheat of the second heat exchanger 30 and a change in the end temperature difference of the second heat exchanger 30 within a preset time;

[0149] S70, when the outlet superheat of the second heat exchanger 30 is less than or equal to the first change value, and the end temperature difference of the second heat exchanger 30 is less than or equal to the second change value, the openings of the first throttling assembly 60 and the third throttling assembly 80 are kept unchanged;

[0150] S80, when the outlet superheat of the second heat exchanger 30 is greater than the first change value and the end temperature difference of the second heat exchanger 30 is greater than the second change value, repeat the steps of confirming the load demand at the end of the air-conditioning system 100 according to the water temperature in the first water inlet pipe 21 and the water temperature in the second water inlet pipe 23, the load demand including high-temperature chilled water demand, low-temperature chilled water demand and high and low-temperature chilled water demand.

[0151] Please refer to Figure 3 , Fig.14 and Fig.15 In certain embodiments, the controller 101 is used to obtain the temperature difference change of the outlet superheat of the second heat exchanger 30 and the change of the end temperature difference of the second heat exchanger 30 within a preset time; and to keep the opening of the first throttling component 60 and the third throttling component 80 unchanged when the outlet superheat of the second heat exchanger 30 is less than or equal to the first change value and the end temperature difference of the second heat exchanger 30 is less than or equal to the second change value; and to repeat the steps of confirming the load demand of the end of the air-conditioning system 100 according to the water temperature in the first water inlet pipe 21 and the water temperature in the second water inlet pipe 23 when the outlet superheat of the second heat exchanger 30 is greater than the first change value and the end temperature difference of the second heat exchanger 30 is greater than the second change value. The load demand includes the steps of high-temperature chilled water demand, low-temperature chilled water demand and high-low temperature chilled water demand.

[0152] Please refer to Figure 4 , Fig.14 and Fig.15In some embodiments, the acquisition module 201 is used to obtain the temperature difference change of the outlet superheat of the second heat exchanger 30 and the change of the end temperature difference of the second heat exchanger 30 within a preset time; the adjustment module 203 is used to keep the opening of the first throttling component 60 and the third throttling component 80 unchanged when the outlet superheat of the second heat exchanger 30 is less than or equal to the first change value and the end temperature difference of the second heat exchanger 30 is less than or equal to the second change value; the circulation module 204 is used to repeat the steps of confirming the load demand at the end of the air-conditioning system 100 according to the water temperature in the first water inlet pipe 21 and the water temperature in the second water inlet pipe 23 when the outlet superheat of the second heat exchanger 30 is greater than the first change value and the end temperature difference of the second heat exchanger 30 is greater than the second change value. The load demand includes the steps of high-temperature chilled water demand, low-temperature chilled water demand and high and low-temperature chilled water demand.

[0153] In this way, by controlling the outlet superheat of the second heat exchanger 30 and the change value of the end temperature difference of the second heat exchanger 30, the stability of the outlet superheat can be improved, thereby reducing the abnormal fluctuation of the outlet superheat.

[0154] Specifically, the first change value may be a preset temperature change value, for example, 1 K to 3 K. The second change value may be a preset temperature change value, for example, 1 K to 3 K. It should be noted that the numerical values ​​here are only examples for easy understanding and cannot be used as limitations on the embodiments of the present invention.

[0155] Please refer to Figure 1 and Fig.16 In some embodiments, the step of confirming the load demand of the end of the air conditioning system 100 according to the water temperature in the first water inlet pipe 21 and the water temperature in the second water inlet pipe 23, wherein the load demand includes the high-temperature chilled water demand, the low-temperature chilled water demand and the high-low-temperature chilled water demand (step S20) includes:

[0156] S21, when the water temperature in the first water inlet pipe 21 is greater than the first preset water temperature, and the water temperature in the second water inlet pipe 23 is less than or equal to the second preset water temperature, confirming that the load demand is a high chilled water demand;

[0157] S22, when the water temperature in the first water inlet pipe 21 is greater than the second preset water temperature, and the water temperature in the first water inlet pipe 21 is less than or equal to the first preset water temperature, confirming that the load demand is a low chilled water demand;

[0158] S23, when the water temperature in the first water inlet pipe 21 is greater than the first preset water temperature, and the water temperature in the second water inlet pipe 23 is greater than the second preset water temperature, confirming that the load demand is a high or low chilled water demand.

[0159] Please refer to Figure 3 and Fig.16In some embodiments, the controller 101 is used to confirm that the load demand is a high chilled water demand when the water temperature in the first water inlet pipe 21 is greater than the first preset water temperature and the water temperature in the second water inlet pipe 23 is less than or equal to the second preset water temperature; and is used to confirm that the load demand is a low chilled water demand when the water temperature in the first water inlet pipe 21 is greater than the second preset water temperature and the water temperature in the first water inlet pipe 21 is less than or equal to the first preset water temperature; and is used to confirm that the load demand is a high-low chilled water demand when the water temperature in the first water inlet pipe 21 is greater than the first preset water temperature and the water temperature in the second water inlet pipe 23 is greater than the second preset water temperature.

[0160] Please refer to Figure 4 and Fig.16 In some embodiments, the confirmation module 202 is used to confirm that the load demand is a high chilled water demand when the water temperature in the first water inlet pipe 21 is greater than the first preset water temperature and the water temperature in the second water inlet pipe 23 is less than or equal to the second preset water temperature; and to confirm that the load demand is a low chilled water demand when the water temperature in the first water inlet pipe 21 is greater than the second preset water temperature and the water temperature in the first water inlet pipe 21 is less than or equal to the first preset water temperature; and to confirm that the load demand is a high-low chilled water demand when the water temperature in the first water inlet pipe 21 is greater than the first preset water temperature and the water temperature in the second water inlet pipe 23 is greater than the second preset water temperature.

[0161] In this way, by comparing the water temperature in the first water inlet pipe 21 and the second water inlet pipe 23 with the preset water temperature value, the air conditioning system 100 can make an accurate response according to the actual water temperature, thereby accurately confirming the load demand.

[0162] Please refer to Figure 1 In some embodiments, the air conditioning system 100 further includes a gas-liquid separator 90 , one end of the gas-liquid separator 90 is connected to the compressor 50 , and the other end of the gas-liquid separator 90 is connected to the third throttling assembly 80 and the third heat exchanger 40 .

[0163] In this way, the gas-liquid separator 90 can reduce the situation where the liquid refrigerant directly enters the compressor 50, thereby reducing the probability of liquid hammer phenomenon, thereby extending the service life of the compressor 50 and improving the operating efficiency and reliability of the air-conditioning system 100.

[0164] Specifically, the output end of the gas-liquid separator 90 may be connected to the input end of the compressor 50. The input end of the gas-liquid separator 90 may be connected to the output end of the third throttling assembly 80 and may be connected to the output end of the third heat exchanger 40.

[0165] The non-volatile computer-readable storage medium of computer-executable instructions of the embodiment of the present invention is characterized in that when the computer-executable instructions are executed by one or more processors, the processors execute the control method of any of the above embodiments.

[0166] Specifically, the processor can execute any step in the control method.

[0167] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the embodiments of the present invention includes additional implementations, in which the order shown or discussed may not be followed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0168] The logic and / or steps represented in the flowchart or otherwise described herein. For example, it can be considered as an ordered list of executable instructions for implementing a logical function, which can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processing module, or other system that can obtain instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain storage, communication, propagation or transmission of programs for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (non-exhaustive list) include the following: an electrical connection with one or more wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0169] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0170] It should be understood that the various parts of the embodiments of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0171] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0172] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0173] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0174] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0175] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A control method for an air conditioning system, characterized in that: The air conditioning system comprises a first heat exchanger, a second heat exchanger, a third heat exchanger and a compressor connected by a refrigerant pipeline, a first throttling component is provided between the first heat exchanger and the second heat exchanger, a second throttling component is provided between the first heat exchanger and the third heat exchanger, a third throttling component is provided between the second heat exchanger and the compressor, the refrigerant pipeline comprises a first branch and a second branch, the first throttling component, the second heat exchanger and the third throttling component are sequentially arranged on the first branch, the second throttling component and the third heat exchanger are sequentially arranged on the second branch, the first branch is connected in parallel with the second branch, the second heat exchanger is connected with a first water inlet pipe and a first water outlet pipe, the third heat exchanger is connected with a second water inlet pipe and a second water outlet pipe, the first water outlet pipe is used to output high-temperature chilled water, and the second water outlet pipe is used to output low-temperature chilled water, and the control method comprises: Acquiring the water temperature in the first water inlet pipe, and acquiring the water temperature in the second water inlet pipe; According to the water temperature in the first water inlet pipe and the water temperature in the second water inlet pipe, confirming the load demand of the terminal of the air conditioning system, wherein the load demand includes high-temperature chilled water demand, low-temperature chilled water demand and high-low temperature chilled water demand; According to the load demand, the opening of the first throttling component, the opening of the second throttling component or the opening of the third throttling component is adjusted to produce high-temperature chilled water, low-temperature chilled water or high-low temperature chilled water.

2. The control method according to claim 1, characterized in that: The step of adjusting the opening of the first throttling component, the opening of the second throttling component or the opening of the third throttling component according to the load demand to produce high-temperature chilled water, low-temperature chilled water or high-low temperature chilled water comprises: When the load demand at the end of the air-conditioning system is a high-temperature chilled water demand, the opening of the third throttling component is adjusted to the maximum, the opening of the first throttling component is adjusted, and the second throttling component is controlled to be closed to produce the high-temperature chilled water.

3. The control method according to claim 2, characterized in that: When the load demand at the end of the air-conditioning system is a high-temperature chilled water demand, the step of adjusting the opening of the third throttling component to the maximum, adjusting the opening of the first throttling component, and controlling the second throttling component to close to produce the high-temperature chilled water includes: Obtaining an outlet superheat of the second heat exchanger; The opening degree of the first throttling component is adjusted according to the outlet superheat of the second heat exchanger.

4. The control method according to claim 1, characterized in that: The step of adjusting the opening of the first throttling component, the opening of the second throttling component or the opening of the third throttling component according to the load demand to produce high-temperature chilled water, low-temperature chilled water or high-low temperature chilled water comprises: When the load demand at the end of the air-conditioning system is low-temperature chilled water, the first throttling component is controlled to be closed, the opening of the third throttling component is adjusted to the maximum, and the opening of the second throttling component is adjusted to produce the low-temperature chilled water.

5. The control method according to claim 4, characterized in that: When the load demand at the end of the air-conditioning system is low-temperature chilled water, the step of controlling the first throttling component to close, adjusting the opening of the third throttling component to the maximum, and adjusting the opening of the second throttling component to produce the low-temperature chilled water includes: Obtaining an outlet superheat degree of the third heat exchanger; The opening degree of the second throttling component is adjusted according to the outlet superheat degree of the third heat exchanger.

6. The control method according to claim 1, characterized in that: The step of adjusting the opening of the first throttling component, the opening of the second throttling component or the opening of the third throttling component according to the load demand to produce high-temperature chilled water, low-temperature chilled water or high-low temperature chilled water comprises: When the load demand at the end of the air-conditioning system is high and low temperature chilled water, the opening of the first throttling component, the opening of the second throttling component and the opening of the third throttling component are adjusted to produce the high and low temperature chilled water.

7. The control method according to claim 6, characterized in that: When the load demand at the end of the air conditioning system is high and low temperature chilled water, the step of adjusting the opening of the first throttling component, the opening of the second throttling component and the opening of the third throttling component to produce high and low temperature chilled water includes: Obtaining the outlet superheat of the second heat exchanger and the end temperature difference of the second heat exchanger, and obtaining the outlet superheat of the third heat exchanger; The opening of the first throttling component is adjusted according to the outlet superheat of the second heat exchanger, the opening of the third throttling component is adjusted according to the end temperature difference of the second heat exchanger, and the opening of the second throttling component is adjusted according to the outlet superheat of the third heat exchanger.

8. The control method according to claim 7, characterized in that: The step of adjusting the opening of the first throttling component according to the outlet superheat of the second heat exchanger and adjusting the opening of the third throttling component according to the end temperature difference of the second heat exchanger comprises: When the outlet superheat of the second heat exchanger is greater than a first preset value and the end temperature difference of the second heat exchanger is greater than a second preset value, the opening of the first throttling component is controlled to remain unchanged, and the opening of the third throttling component is reduced; When the outlet superheat of the second heat exchanger is less than or equal to a first preset value and the end temperature difference of the second heat exchanger is less than or equal to a second preset value, repeat the steps of confirming the load demand at the end of the air-conditioning system according to the water temperature in the first water inlet pipe and the water temperature in the second water inlet pipe, wherein the load demand includes a high-temperature chilled water demand, a low-temperature chilled water demand and high and low-temperature chilled water demands.

9. The control method according to claim 8, characterized in that: The control method further comprises: When the outlet superheat of the second heat exchanger is less than or equal to a third preset value, stop reducing the opening of the third throttling component and simultaneously reduce the opening of the first throttling component; When the outlet superheat of the second heat exchanger is greater than the third preset value, the opening of the first throttling component is controlled to remain unchanged, and the opening of the third throttling component is reduced.

10. The control method according to claim 9, characterized in that: The control method further comprises: Within a preset time, obtaining a change in the temperature difference of the outlet superheat of the second heat exchanger, and obtaining a change in the end temperature difference of the second heat exchanger; When the outlet superheat of the second heat exchanger is less than or equal to the first change value, and the end temperature difference of the second heat exchanger is less than or equal to the second change value, the openings of the first throttling component and the third throttling component are kept unchanged; When the outlet superheat of the second heat exchanger is greater than the first change value and the end temperature difference of the second heat exchanger is greater than the second change value, repeat the steps of confirming the load demand at the end of the air-conditioning system according to the water temperature in the first water inlet pipe and the water temperature in the second water inlet pipe, wherein the load demand includes high-temperature chilled water demand, low-temperature chilled water demand and high and low-temperature chilled water demand.

11. The control method according to claim 1, characterized in that: The step of confirming the load demand of the terminal of the air conditioning system according to the water temperature in the first water inlet pipe and the water temperature in the second water inlet pipe, wherein the load demand includes a high-temperature chilled water demand, a low-temperature chilled water demand and a high-low-temperature chilled water demand comprises: When the water temperature in the first water inlet pipe is greater than the first preset water temperature, and the water temperature in the second water inlet pipe is less than or equal to the second preset water temperature, confirming that the load demand is a high chilled water demand; When the water temperature in the first water inlet pipe is greater than the second preset water temperature and the water temperature in the first water inlet pipe is less than or equal to the first preset water temperature, confirming that the load demand is a low chilled water demand; When the water temperature in the first water inlet pipe is greater than the first preset water temperature, and the water temperature in the second water inlet pipe is greater than the second preset water temperature, it is confirmed that the load demand is a high-low chilled water demand.

12. An air conditioning system, characterized in that: The air-conditioning system comprises a first heat exchanger, a second heat exchanger, a third heat exchanger and a compressor connected by a refrigerant pipeline, a first throttling component is arranged between the first heat exchanger and the second heat exchanger, a second throttling component is arranged between the first heat exchanger and the third heat exchanger, and a third throttling component is arranged between the second heat exchanger and the compressor, the refrigerant pipeline comprises a first branch and a second branch, the first throttling component, the second heat exchanger and the third throttling component are arranged on the first branch in sequence, the second throttling component and the third heat exchanger are arranged on the second branch in sequence, the first branch is connected in parallel with the second branch, the second heat exchanger is connected with a first water inlet pipe and a first water outlet pipe, the third heat exchanger is connected with a second water inlet pipe and a second water outlet pipe, the first water outlet pipe is used to output high-temperature chilled water, and the second water outlet pipe is used to output low-temperature chilled water, the air-conditioning system also comprises a controller and a memory, the memory is used to store a computer program, and the controller is used to execute the computer program to implement the control method described in any one of claims 1 to 11.

13. The air conditioning system according to claim 12, characterized in that: The air conditioning system further comprises a gas-liquid separator, one end of which is connected to the compressor, and the other end of which is connected to the third throttling assembly and the third heat exchanger.

14. A control device for an air conditioning system, characterized in that: The air conditioning system comprises a first heat exchanger, a second heat exchanger, a third heat exchanger and a compressor connected by a refrigerant pipeline, a first throttling component is provided between the first heat exchanger and the second heat exchanger, a second throttling component is provided between the first heat exchanger and the third heat exchanger, a third throttling component is provided between the second heat exchanger and the compressor, the refrigerant pipeline comprises a first branch and a second branch, the first throttling component, the second heat exchanger and the third throttling component are sequentially arranged on the first branch, the second throttling component and the third heat exchanger are sequentially arranged on the second branch, the first branch is connected in parallel with the second branch, the second heat exchanger is connected with a first water inlet pipe and a first water outlet pipe, the third heat exchanger is connected with a second water inlet pipe and a second water outlet pipe, the first water outlet pipe is used to output high-temperature chilled water, and the second water outlet pipe is used to output low-temperature chilled water, and the control device comprises: an acquisition module, the acquisition module being used to acquire the water temperature in the first water inlet pipe and the water temperature in the second water inlet pipe; A confirmation module, the confirmation module is used to confirm the load demand of the terminal of the air-conditioning system according to the water temperature in the first water inlet pipe and the water temperature in the second water inlet pipe, the load demand including high-temperature chilled water demand, low-temperature chilled water demand and high-low temperature chilled water demand; A regulating module is used to adjust the opening of the first throttling component, the opening of the second throttling component or the opening of the third throttling component according to the load demand to produce high-temperature chilled water, low-temperature chilled water or high-low temperature chilled water.

15. A non-volatile computer-readable storage medium of computer-executable instructions, characterized in that: When the computer executable instructions are executed by one or more processors, the processors are enabled to execute the control method according to any one of claims 1 to 11.

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