Refrigerant circulation system, control method and device thereof, electronic equipment and storage medium

Abstract

The application relates to a refrigerant circulation system and a control method and device thereof, electronic equipment and a storage medium. The system comprises a refrigerant circulation subsystem and a liquid storage module. The refrigerant circulation subsystem comprises a first pressure pipeline and a second pressure pipeline. The pressure of the first pressure pipeline is greater than that of the second pressure pipeline. The liquid storage module is connected with the first pressure pipeline through a first pipeline. A liquid inlet valve is arranged on the first pipeline. The liquid storage module is connected with the second pressure pipeline through a second pipeline. An air balance valve is arranged on the second pipeline. The air balance valve is used for adjusting the flow rate of refrigerant in the liquid storage module. The liquid storage module is connected with the second pressure pipeline through a third pipeline. A liquid outlet valve is arranged on the third pipeline. Therefore, the refrigerant amount in the refrigerant circulation system can be more accurately adjusted, and the energy efficiency of the refrigerant circulation system is improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a refrigerant circulation system and its control method, device, electronic equipment and storage medium. Background Technology

[0002] Currently, for multi-split air conditioning systems, changes in outdoor temperature, the number of indoor units in operation, and load rates all significantly affect the refrigerant required by the system. Therefore, during the operation of multi-split systems, an inappropriate refrigerant level often occurs, preventing the system from achieving optimal energy efficiency. Thus, adjusting the refrigerant level is crucial during the operation of multi-split systems.

[0003] In existing technologies, when it is determined that the amount of refrigerant in a multi-split system needs to be adjusted, the amount of refrigerant in the system is generally increased or decreased by opening or closing the liquid receiver. However, in this process, the amount of refrigerant flowing in and out cannot be accurately controlled. This not only makes it impossible to accurately adjust the amount of refrigerant in the multi-split system, but also easily has the opposite effect. Summary of the Invention

[0004] This application provides a refrigerant circulation system and its control method, device, electronic equipment, and storage medium to solve the technical problem in the prior art where the amount of refrigerant flowing into and out of the liquid tank cannot be accurately controlled when adjusting the refrigerant amount in a multi-split system through the liquid tank. This results in not only the inability to accurately adjust the refrigerant amount in the multi-split system but also the potential for the opposite effect.

[0005] In a first aspect, this application provides a refrigerant circulation system, including: a refrigerant circulation subsystem and a liquid storage module, wherein the refrigerant circulation subsystem includes a first pressure line and a second pressure line, and the pressure of the first pressure line is greater than the pressure of the second pressure line;

[0006] The liquid storage module is connected to the first pressure pipeline via a first pipeline, and an inlet valve is installed on the first pipeline; the refrigerant in the refrigerant circulation subsystem flows into the liquid storage module through the first pipeline;

[0007] The liquid storage module is connected to the second pressure pipeline via a second pipeline, and a gas balance valve is installed on the second pipeline. The gaseous refrigerant in the liquid storage module flows into the refrigerant circulation subsystem through the second pipeline; the gas balance valve is used to regulate the flow rate of the refrigerant in the liquid storage module.

[0008] The liquid storage module is connected to the second pressure pipeline via a third pipeline, and a drain valve is installed on the third pipeline; the liquid refrigerant in the liquid storage module flows into the refrigerant circulation subsystem through the third pipeline.

[0009] As an optional implementation, the liquid storage module is connected to the first pipeline via a first end at the top;

[0010] The liquid storage module is connected to the second pipeline via the second end at the top;

[0011] The liquid storage module is connected to the third pipeline via the third end at the bottom.

[0012] As an optional implementation, the refrigerant circulation system also includes a fourth pipeline;

[0013] The first end of the fourth pipeline is connected to the first end of the top of the liquid storage module;

[0014] The second end of the fourth pipeline is connected to the second pressure pipeline;

[0015] An unloading valve is installed on the fourth pipeline.

[0016] Secondly, this application provides a control method for a refrigerant circulation system, applied to the refrigerant circulation system described in any one of the first aspects, the method comprising:

[0017] Obtain the set of parameters involved in the operation of the refrigerant circulation subsystem in the refrigerant circulation system;

[0018] Based on the parameter set, determine the current energy efficiency and current power of the refrigerant cycle subsystem, as well as the predicted target energy efficiency and target power.

[0019] The operating mode of the liquid storage module is determined based on the current energy efficiency, the target energy efficiency, the current power, and the target power.

[0020] According to the operating mode, adjust the on / off state of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module.

[0021] As an optional implementation, the refrigerant circulation subsystem includes at least one indoor module and at least one outdoor module. The indoor module is used for cooling or heating the indoor space. The acquisition of the parameter set involved in the operation of the refrigerant circulation subsystem includes:

[0022] Obtain the system operation mode of the refrigerant circulation subsystem;

[0023] Obtain a set temperature value for at least one of the indoor modules, and obtain an indoor temperature value through a temperature sensor installed in the indoor module;

[0024] The outdoor temperature value is obtained by a temperature sensor installed on the outdoor module;

[0025] Determine the total output energy of the indoor module;

[0026] Obtain the first power of the indoor module and the second power of the outdoor module;

[0027] The system operating mode, at least one set temperature value, at least one indoor temperature value, at least one outdoor temperature value, the total output energy, the first power, and the second power are included in the parameter set.

[0028] As an optional implementation, determining the current energy efficiency and current power of the refrigerant cycle subsystem, as well as the predicted target energy efficiency and target power, based on the parameter set, includes:

[0029] The system operating mode, at least one set temperature value, at least one indoor temperature value, and at least one outdoor temperature value are input into a preset performance test model to obtain the target energy efficiency and target power output by the performance test model.

[0030] The first power and the second power are added together to obtain the current power;

[0031] The current energy efficiency is obtained by dividing the total output energy by the current power.

[0032] As an optional implementation, determining the operating mode of the liquid storage module based on the current energy efficiency, the target energy efficiency, the current power, and the target power includes:

[0033] If it is determined that the current energy efficiency is less than the target energy efficiency, the current power is compared with the target power to obtain a comparison result;

[0034] If the comparison result indicates that the current power is less than the target power, the initial operating mode of the liquid storage module is determined to be the refrigerant discharge mode;

[0035] If the comparison result indicates that the current power is greater than or equal to the target power, the initial operating mode of the liquid storage module is determined to be the refrigerant storage mode;

[0036] Determine the comparison power range corresponding to the initial operating mode;

[0037] The operating mode of the liquid storage module is determined based on the current power and the comparison power range.

[0038] As an optional implementation, determining the comparison power range corresponding to the initial operating mode includes:

[0039] When the initial operating mode is the refrigerant discharge mode, the comparison power range corresponding to the initial operating mode includes a first liquid discharge power range and a second liquid discharge power range; the power of the first liquid discharge power range is less than the power of the second liquid discharge power range, and the power of the second liquid discharge power range is less than the target power.

[0040] Determining the operating mode of the liquid storage module based on the current power and the comparison power range includes:

[0041] If it is determined that the current power belongs to the first liquid discharge power range, the operating mode of the liquid storage module is determined to be the rapid refrigerant discharge mode;

[0042] If the current power is determined to be within the second discharge power range, the operating mode of the liquid storage module is determined to be the flexible refrigerant discharge mode.

[0043] As an optional implementation, adjusting the on / off states of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module according to the operating mode includes:

[0044] When the liquid storage module is in the rapid refrigerant discharge mode, the liquid inlet valve connected to the liquid storage module is closed, the gas balance valve is opened, and the liquid discharge valve is opened.

[0045] When the liquid storage module is in flexible refrigerant discharge mode, the liquid inlet valve connected to the liquid storage module is closed, the gas balance valve is closed, and the liquid discharge valve is opened.

[0046] As an optional implementation, determining the comparison power range corresponding to the initial operating mode includes:

[0047] When the initial operating mode is the refrigerant storage mode, the comparison power range corresponding to the initial operating mode includes a first liquid storage power range and a second liquid storage power range; the power of the first liquid storage power range is less than the power of the second liquid storage power range, and the power of the first liquid storage power range is greater than the target power.

[0048] Determining the operating mode of the liquid storage module based on the current power and the comparison power range includes:

[0049] If it is determined that the current power belongs to the first liquid storage power range, the operating mode of the liquid storage module is determined to be the flexible refrigerant storage mode;

[0050] If the current power is determined to be within the second liquid storage power range, the operating mode of the liquid storage module is determined to be the rapid refrigerant storage mode.

[0051] As an optional implementation, adjusting the on / off states of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module according to the operating mode includes:

[0052] When the liquid storage module is in flexible refrigerant storage mode, the liquid inlet valve connected to the liquid storage module is opened, the gas balance valve is closed, and the liquid drain valve is closed.

[0053] When the liquid storage module is in the rapid refrigerant storage mode, the inlet valve connected to the liquid storage module is opened, the gas balance valve is opened, and the drain valve is closed.

[0054] As an optional implementation, each comparison power interval includes multiple sub-power intervals, and each sub-power interval corresponds to a runtime; wherein, the runtime is positively correlated with the absolute value of the difference between the sub-power intervals, and the absolute value of the difference is the absolute value of the difference between any power value in the sub-power interval and the target power;

[0055] After determining the operating mode of the liquid storage module based on the current power and the comparison power range, the method further includes:

[0056] Determine the target sub-power range to which the current power belongs;

[0057] The runtime corresponding to the target sub-power range is determined as the target duration.

[0058] After adjusting the on / off states of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module according to the operating mode, the method further includes:

[0059] The target duration is maintained by keeping the liquid storage module running in its current operating state.

[0060] Thirdly, this application provides a control device for a refrigerant circulation system, applied to the refrigerant circulation system described in any one of the second aspects, the device comprising:

[0061] The acquisition module is used to acquire the set of parameters involved in the operation of the refrigerant circulation subsystem in the refrigerant circulation system;

[0062] The first determining module is used to determine the current energy efficiency and current power of the refrigerant circulation subsystem, as well as the predicted target energy efficiency and target power, based on the parameter set.

[0063] The second determining module is used to determine the operating mode of the liquid storage module based on the current energy efficiency, the target energy efficiency, the current power, and the target power.

[0064] The adjustment module is used to adjust the on / off state of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module according to the operating mode.

[0065] Thirdly, this application provides an electronic device, including: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; the memory is used to store a computer program; and the processor is used to implement the control method of the refrigerant circulation system according to any one of the second aspects when executing the computer program.

[0066] Fourthly, this application provides a storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method of the refrigerant circulation system described in any of the second aspects.

[0067] Compared with the prior art, the technical solution provided in this application has the following advantages: The refrigerant circulation system provided in this application connects the refrigerant inflow pipe in the liquid storage module to the high-pressure pipe in the refrigerant circulation subsystem to which the refrigerant quantity is to be adjusted, and controls it through the inlet valve. Conversely, the refrigerant outflow pipe in the liquid storage module is connected to the low-pressure pipe in the refrigerant circulation subsystem, and controlled by the drain valve. This ensures smooth refrigerant inflow and outflow. Simultaneously, another pipe is connected to the low-pressure pipe in the refrigerant circulation subsystem within the liquid storage module, and a gas balance valve is installed. By adjusting this gas balance valve, the amount of gaseous refrigerant in the liquid storage module can be changed, thus adjusting the pressure within the liquid storage module and consequently regulating the refrigerant flow rate. Based on the above structure of the liquid storage module, different combinations of the inlet valve, drain valve, and gas balance valve can be used to accurately control the inflow and outflow of refrigerant in the liquid storage module, achieving more accurate adjustment of the refrigerant quantity in the refrigerant circulation system and improving the energy efficiency of the refrigerant circulation system. Attached Figure Description

[0068] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0069] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0070] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0071] Figure 1 This is a schematic diagram of a refrigerant circulation system provided in an embodiment of this application;

[0072] Figure 2 This is a schematic diagram of another refrigerant circulation system provided in an embodiment of this application;

[0073] Figure 3 A schematic diagram of another refrigerant circulation system provided in this application embodiment;

[0074] Figure 4 Schematic diagrams illustrating several operating modes of the liquid storage tank provided in the embodiments of this application;

[0075] Figure 5 A schematic diagram of a refrigeration flow path in a refrigerant circulation system provided in an embodiment of this application;

[0076] Figure 6 A schematic diagram of a heating flow path in a refrigerant circulation system provided for an embodiment of this application;

[0077] Figure 7 A flowchart illustrating an embodiment of a control method for a refrigerant circulation system provided in this application;

[0078] Figure 8 A flowchart illustrating an embodiment of a control method for a refrigerant circulation system provided in this application;

[0079] Figure 9 A flowchart illustrating an embodiment of a control method for a refrigerant circulation system provided in this application;

[0080] Figure 10 A flowchart illustrating an embodiment of a control method for a refrigerant circulation system provided in this application;

[0081] Figure 11 A flowchart illustrating an embodiment of a control method for a refrigerant circulation system provided in this application;

[0082] Figure 12 A block diagram illustrating an embodiment of a control device for a refrigerant circulation system provided in this application;

[0083] Figure 13 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0084] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0085] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0086] To address the technical problem in existing technologies where the refrigerant flow in and out of a liquid receiver tank cannot be accurately controlled when adjusting the refrigerant level in a multi-split air conditioning system, resulting in inaccurate refrigerant adjustment and potentially adverse effects, this application provides a refrigerant circulation system. This system connects the refrigerant inflow pipe in the liquid receiver module to a higher-pressure pipe in the refrigerant circulation subsystem, controlled by an inlet valve, and connects the refrigerant outflow pipe in the liquid receiver module to a lower-pressure pipe in the same subsystem, controlled by a drain valve. This ensures... The refrigerant flows smoothly in and out. Simultaneously, an additional pipeline is installed in the liquid storage module to connect to the lower-pressure pipeline in the refrigerant circulation subsystem. A gas balance valve is also installed; by adjusting this valve, the amount of gaseous refrigerant in the liquid storage module can be changed, thus regulating the pressure within the module and consequently the refrigerant flow rate. Based on this structure, different combinations of the inlet valve, outlet valve, and gas balance valve can accurately control the inflow and outflow of refrigerant in the liquid storage module, achieving more precise regulation of the refrigerant quantity in the refrigerant circulation system and improving its energy efficiency.

[0087] The refrigerant circulation system provided in this application will be further explained and described below with reference to the accompanying drawings and specific embodiments. The embodiments do not constitute a limitation on the embodiments of this application.

[0088] See Figure 1 This is a schematic diagram of a refrigerant circulation system provided in an embodiment of this application. Figure 1 As shown, the refrigerant circulation system 10 may include a refrigerant circulation subsystem 11 and a liquid storage module 12.

[0089] The refrigerant circulation subsystem 11 may include a first pressure line 111 and a second pressure line 112. The refrigerant circulation subsystem 11 may be an air conditioning system, and more specifically, a multi-split air conditioning system. The refrigerant circulation subsystem 11 can be used to regulate the indoor temperature for cooling or heating.

[0090] The aforementioned liquid storage module 12 is used to store the refrigerant in the refrigerant circulation system. This refrigerant refers to the medium used for refrigeration, and can be Freon or other refrigerants; this application embodiment does not impose any limitations on this. The aforementioned liquid storage module 12 can be a liquid storage tank or other liquid storage container; this application embodiment does not impose any limitations on this.

[0091] The aforementioned liquid storage module 12 can be connected to the aforementioned first pressure pipeline 111 via the first pipeline 121, and an inlet valve 13 can be installed on the aforementioned first pipeline 121. Refrigerant in the aforementioned refrigerant circulation subsystem 11 can flow into the aforementioned liquid storage module 12 via the aforementioned first pipeline 121. The aforementioned inlet valve 13 can be used to regulate the amount of refrigerant flowing through the first pipeline 121. This application embodiment does not limit the type or size of the inlet valve 13.

[0092] The aforementioned liquid storage module 12 can be connected to the aforementioned second pressure pipeline 112 via the second pipeline 122. The aforementioned second pipeline 122 is equipped with a gas balance valve 14, through which the gaseous refrigerant in the liquid storage module can flow into the refrigerant circulation subsystem 11. The aforementioned gas balance valve 14 can be used to regulate the flow rate of the refrigerant in the liquid storage module 12.

[0093] The aforementioned liquid storage module 12 can be connected to the second pressure pipeline 112 via a third pipeline 123, and a drain valve 15 is installed on the third pipeline. The liquid refrigerant in the liquid storage module 12 can flow into the aforementioned refrigerant circulation subsystem 11 via the third pipeline.

[0094] In one embodiment, based on Figure 1 In the refrigerant circulation system 10 shown in this application embodiment, when the executing entity controls the amount of refrigerant in the refrigerant circulation subsystem 11, it can determine the required amount of refrigerant in the refrigerant circulation subsystem 11 and control the liquid inlet valve 13, gas balance valve 14, and liquid outlet valve 15 in the liquid storage module 12 to control the liquid storage module 12 to provide the required amount of refrigerant to the refrigerant circulation subsystem 11. Since the liquid inlet valve 13 is connected to the first pressure pipeline 111 with higher pressure in the refrigerant circulation subsystem 11, and the liquid outlet valve 15 is connected to the second pressure pipeline 112 with lower pressure in the refrigerant circulation subsystem 11, a pressure difference is formed between the liquid inlet valve 13 and the liquid outlet valve 15, so that the refrigerant can flow smoothly into and out of the liquid storage module 12.

[0095] Furthermore, since there is a gas balance valve 14 in the liquid storage module 12, the gas balance valve 14 can adjust the pressure inside the liquid storage module 12, thereby adjusting the flow rate of refrigerant flowing into and out of the liquid storage module 12. Therefore, the amount of refrigerant in the refrigerant circulation subsystem 11 can be controlled more accurately through the liquid storage module 12.

[0096] The refrigerant circulation system provided in this application connects the refrigerant inflow pipeline in the liquid storage module to the higher-pressure pipeline in the refrigerant circulation subsystem, controlled by an inlet valve, and the refrigerant outflow pipeline in the liquid storage module to the lower-pressure pipeline in the refrigerant circulation subsystem, controlled by a drain valve. This ensures smooth refrigerant inflow and outflow. Simultaneously, another pipeline in the liquid storage module connects to the lower-pressure pipeline in the refrigerant circulation subsystem, and a gas balance valve is installed. Adjusting this gas balance valve changes the amount of gaseous refrigerant in the liquid storage module, regulating the pressure within the module and thus adjusting the refrigerant flow rate. Based on this structure, different combinations of the inlet valve, drain valve, and gas balance valve can accurately control the inflow and outflow of refrigerant in the liquid storage module, achieving more precise regulation of the refrigerant quantity in the refrigerant circulation system.

[0097] Further, see Figure 2 This is a schematic diagram of another refrigerant circulation system provided in an embodiment of this application. Figure 2 As shown, the top of the liquid storage module 12 in the refrigerant circulation system 10 may include a first end P1 and a second end P2, and the bottom of the liquid storage module 12 may include a third end P3.

[0098] The liquid storage module 12 can be connected to the first pipeline 121 through the first end P1 at the top, the liquid storage module 12 can be connected to the second pipeline 122 through the second end P2 at the top, and the liquid storage module 12 can be connected to the third pipeline 123 through the third end P3 at the bottom.

[0099] Based on this connection method, the first pipe 121 for refrigerant to flow into the liquid storage module 12 and the second pipe 122 for gaseous refrigerant to flow out are both connected to the top of the liquid storage module 12, and the third pipe 123 for discharging refrigerant is connected to the bottom of the liquid storage module 12. This allows refrigerant to flow in quickly from the top, gaseous refrigerant to flow out quickly from the top, and liquid refrigerant to flow out quickly from the bottom, ensuring timely refrigerant adjustment.

[0100] Furthermore, such as Figure 2As shown, the refrigerant circulation system 10 may further include a fourth pipe 21. The first end T1 of the fourth pipe 21 may be connected to the first end P1 at the top of the liquid storage module 12, and the second end T2 of the fourth pipe 21 may be connected to the second pressure pipe 112. An unloading valve 22 may be installed on the fourth pipe.

[0101] Based on this connection method, the unloading valve 22 can be automatically opened when the pressure in the liquid storage module 12 exceeds the standard, so as to ensure the safety of the refrigerant circulation system 10.

[0102] See Figure 3 This is a schematic diagram of another refrigerant circulation system provided in the embodiments of this application. Figure 3 The system structure shown is illustrated using the circulating refrigerant subsystem 11 as an air conditioning system and the liquid storage module 12 as a liquid storage tank as an example. Figure 3 As shown, the system may include the structure shown in Table 1:

[0103] Table 1

[0104] 101 compressor 201 First pipeline 301 Storage tank 102 Four-way valve 202 Second pipeline 302 Inlet valve 103 Outdoor heat exchanger 203 Third pipeline 303 Gas balance valve 104 Upper heating expansion valve 204 Fourth pipeline 304 Drain valve 105 Lower heating expansion valve 205 Liquid side main 305 unloading valve 106 gas-liquid separator 206 air side manifold

[0105] Among them, the 301 liquid storage tank can be used as Figure 1 The liquid storage module 12, 302 shown can have the following inlet valve: Figure 1 The inlet valve 13 and the 303 gas balance valve shown can be... Figure 1 The gas balance valve 14 and the 304 drain valve shown can be used as... Figure 1 The drain valve 15 and 305 unloading valve shown can be... Figure 2 The unloading valve 22 shown above, the aforementioned 205 liquid-side main pipe can be Figure 1 The first pressure pipeline shown above, the third pipeline 203 mentioned above can be... Figure 1 The second pressure line shown above, the line where the 302 inlet valve is located can be... Figure 1 The first pipeline 121 shown above, the pipeline where the aforementioned 303 gas balance valve is located can be... Figure 1 The second pipeline 122 shown above, the pipeline where the aforementioned 304 drain valve is located can be... Figure 1 The third pipeline 123 is shown. The compressor 101, the four-way valve 102, the outdoor heat exchanger 103, the upper heating expansion valve 104, the lower heating expansion valve 105, and the gas-liquid separator 106 described above can constitute... Figure 1 The refrigerant circulation subsystem 11 is shown.

[0106] based on Figure 3 The system structure shown above, the aforementioned 301 liquid storage tank may include the following connection methods:

[0107] The 301 liquid storage tank is connected to the 205 liquid-side main pipe via the 302 inlet valve, and to the 203 third pipe via the 303 gas balance valve and the 304 drain valve. Since the 205 liquid-side main pipe is always on the medium-pressure side in both cooling and heating modes, while the 203 third pipe is always on the low-pressure side, the liquid storage tank has a medium-pressure side at the inlet and a low-pressure side at the drain. This pressure difference ensures sufficient inlet and outlet power.

[0108] The piping related to the 302 inlet valve is connected to the top of the 301 liquid storage tank. When the 302 inlet valve is opened, the refrigerant enters from the top of the 301 liquid storage tank with minimal resistance. After entering, the refrigerant separates into gas and liquid phases, with the upper part being gaseous and the lower part being liquid.

[0109] The piping related to the 303 gas balance valve is also connected to the top of the 301 liquid storage tank. During the liquid filling process, if the 303 gas balance valve is closed, the pressure in the liquid storage tank will gradually increase as the filling process continues, making it difficult for refrigerant to enter the tank. If the 303 gas balance valve is opened at this time, the gaseous refrigerant at the top of the liquid storage tank is connected to the low-pressure side. Excess gaseous refrigerant flows to the low-pressure side under the pressure difference, thereby reducing the pressure in the liquid storage tank and maintaining the filling power. Furthermore, since the filling volume is always much greater than the outflow of gaseous refrigerant through the 303 gas balance valve, it remains a net filling state.

[0110] The 304 drain valve and related pipelines are connected to the bottom of the storage tank. When the 304 drain valve is opened, the liquid refrigerant is discharged from the storage tank under the pressure difference between the storage tank pressure and the low pressure.

[0111] The 305 unloading valve's related piping is connected to the top of the storage tank and automatically opens only when the pressure exceeds the limit, ensuring system safety.

[0112] Based on the above connection method, and according to the combination of the inlet valve, gas balance valve, and drain valve in the 301 liquid storage tank, the working mode of the 301 liquid storage tank can be divided into: Figure 4 The working method shown: See Figure 4 The diagram below illustrates the structure of the liquid storage tank in several operating modes provided in the embodiments of this application. Figure 4 As shown, the liquid storage tank can operate in the following modes:

[0113] See Figure 4 A is a structural schematic diagram of the working mode of a liquid storage tank provided in an embodiment of this application. Figure 4 Method A represents a rapid refrigerant discharge method. In this method, both the 303 gas balance valve and the 304 liquid drain valve open simultaneously. The upper layer of gaseous refrigerant in the storage tank is discharged through the 303 gas balance valve, while the lower layer of liquid refrigerant is discharged through the 304 liquid drain valve. Because both gaseous and liquid refrigerant are discharged simultaneously, this method is suitable for applications requiring rapid refrigerant discharge.

[0114] See Figure 4 B is a structural schematic diagram of another working mode of the liquid storage tank provided in an embodiment of this application. Figure 4 Method B represents a flexible refrigerant discharge method. In this method, only the 304 drain valve is opened, and the lower layer of liquid refrigerant is discharged through the 304 drain valve. Since only liquid refrigerant can be discharged, it is suitable for applications requiring precise control of the discharge volume or where the discharge volume requirement is relatively small.

[0115] See Figure 4 C is a structural schematic diagram of another liquid storage tank operation method provided in an embodiment of this application. Figure 4 Method C represents a flexible refrigerant storage method, in which only the 302 inlet valve is opened. Liquid refrigerant enters from the medium-pressure side. Because the pressure rises rapidly after the storage tank is filled with refrigerant, the refrigerant inlet power decreases rapidly. Therefore, the overall refrigerant inlet rate is relatively low, making it suitable for applications requiring precise control of the inlet volume or where the inlet volume requirement is small.

[0116] See Figure 4 D is a structural schematic diagram of another working mode of the liquid storage tank provided in the embodiment of this application. Figure 4 Method C represents a rapid refrigerant storage method. In this method, the 302 liquid inlet valve and the 303 gas balance valve can be opened simultaneously. While the refrigerant is being introduced, the internal pressure balance of the liquid tank is maintained, thus maintaining the refrigerant storage rate. This method is suitable for occasions that require rapid refrigerant storage.

[0117] In one embodiment, Figure 3 The refrigerant flow direction in the refrigerant circulation system shown can include a cooling flow direction and a heating flow direction. Specifically, the cooling and heating flow directions of the refrigerant in the refrigerant circulation system can be determined separately through… Figure 5 and Figure 6 The process is illustrated below:

[0118] See Figure 5 This is a schematic diagram of a refrigeration flow path in a refrigerant circulation system provided in an embodiment of this application. Figure 5 As shown, during the refrigeration cycle, the refrigerant flows as follows: The refrigerant discharged from compressor 101 enters the second pipeline 202 via the four-way valve 102. After condensation in the outdoor heat exchanger 103, it enters the indoor side for evaporation and refrigeration via the liquid-side main pipe 205. The refrigerated refrigerant returns to the outdoor side via the gas-side main pipe 206, and then returns to the gas-liquid separator 106 and compressor 101 via the four-way valve 102.

[0119] See Figure 6 This is a schematic diagram of a heating flow path in a refrigerant circulation system provided in an embodiment of this application. Figure 6As shown, during heating operation in this refrigeration cycle system, the refrigerant flows as follows: the refrigerant discharged from compressor 101 passes through four-way valve 102 and enters the indoor side via gas-side main pipe 206 for condensation and heating. After heating, the refrigerant returns to the outdoor side via liquid-side main pipe 205, evaporates in outdoor heat exchanger 103, and then returns to gas-liquid separator 106 and compressor 101 via four-way valve 102.

[0120] based on Figure 5 and Figure 6 As shown in the refrigerant flow path, whether in the refrigeration or heating flow path, the liquid inlet side of the 301 liquid tank (302 liquid inlet valve and its pipeline) is connected to the 205 liquid side main pipe and is always under medium pressure. Meanwhile, the gas balance side (303 gas balance valve and its pipeline) and the drain side (304 drain valve and its pipeline) of the 301 liquid tank are connected to the 203 third pipeline and are always under low pressure.

[0121] The refrigerant circulation system provided in this application embodiment is connected to the medium-pressure and low-pressure sides of the system pipeline via an inlet valve, a drain valve, and a gas balance valve to ensure sufficient inlet and outlet refrigerant pressure differential. By combining the above-mentioned valve switches and coordinating the valve switching durations, the refrigerant quantity adjustment speed can be changed, thereby adapting to various refrigerant adjustment needs.

[0122] Based on the refrigerant circulation system shown in the above figure, this application provides a control method for a refrigerant circulation system. This method can determine the current energy efficiency and power of the refrigerant circulation subsystem, as well as the predicted target energy efficiency and power, by acquiring various parameters involved in the operation of the refrigerant circulation subsystem. This allows for the determination of the operating mode of the liquid storage module, and the control of the on / off states of the inlet valve, gas balance valve, and drain valve connected to the energy storage module according to the corresponding operating mode. This ensures that the energy efficiency of the refrigerant circulation subsystem reaches its optimal level, enabling more accurate adjustment of the refrigerant quantity in the refrigerant circulation system, thereby improving the energy efficiency of the refrigerant circulation system.

[0123] See Figure 7 This is a flowchart illustrating an embodiment of a control method for a refrigerant circulation system provided in this application. As one embodiment, Figure 7 The process shown can be applied to Figures 1 to 6 Any of the refrigerant circulation systems shown. For example... Figure 7 As shown, the process may include the following steps:

[0124] Step 701: Obtain the set of parameters involved in the operation of the refrigerant circulation subsystem in the refrigerant circulation system.

[0125] The aforementioned refrigerant circulation system can be a system that achieves cooling or heating functions by circulating refrigerant, for example... Figure 1The refrigerant circulation system 10 shown above refers to the refrigerant used for refrigeration, such as Freon, carbon dioxide, etc., and this application embodiment does not limit this.

[0126] Furthermore, the aforementioned refrigerant circulation system may include a refrigerant circulation subsystem and a liquid storage module, for example... Figure 1 The refrigerant circulation subsystem 11 and the liquid storage module 12 are shown. The refrigerant circulation subsystem can further realize the function of cooling or heating the room.

[0127] In this embodiment of the application, the executing entity may be a controller in the refrigerant circulation system or a control system connected to the refrigerant circulation system. This embodiment of the application does not limit this.

[0128] In one embodiment, to improve the energy efficiency of the refrigerant circulation subsystem, the executing entity of this application embodiment can obtain a set of parameters involved in the operation of the refrigerant circulation subsystem. This parameter set may include various parameters, including but not limited to: the operating mode of the refrigerant circulation subsystem, the set temperature value for cooling or heating the indoor environment, the current indoor temperature, the outdoor temperature, the total output energy of the indoor module, the first power of the indoor module, and the second power of the outdoor module. The indoor module refers to the module in the refrigerant circulation subsystem used for temperature regulation, such as an indoor air conditioner unit, and the outdoor module refers to the module in the refrigerant circulation subsystem installed outdoors, such as an outdoor air conditioner unit.

[0129] As an optional implementation, the execution entity of this application embodiment can obtain the set of parameters involved in the operation of the above-mentioned refrigerant circulation subsystem in real time.

[0130] As another optional implementation, the execution entity of this application embodiment can periodically obtain the set of parameters involved in the operation of the above-mentioned refrigerant circulation subsystem.

[0131] As for how the above parameter set is obtained, it can be explained below. Figure 8 The process shown will be explained in detail here.

[0132] Step 702: Based on the above parameter set, determine the current energy efficiency and current power of the above refrigerant circulation subsystem, as well as the predicted target energy efficiency and target power.

[0133] The aforementioned current energy efficiency refers to the ratio between the energy consumed by the refrigerant circulation subsystem during its current operation and the cooling or heating effect it provides. A high-efficiency air conditioning system consumes less energy for the same cooling capacity, and vice versa.

[0134] The aforementioned current power refers to the total power of all functional modules of the refrigerant circulation subsystem during current operation. These functional modules can be all operable modules included in the refrigerant circulation subsystem, such as the indoor and outdoor modules in an air conditioning system.

[0135] The aforementioned target energy efficiency refers to the predicted high energy efficiency that the refrigerant circulation subsystem can achieve, which can improve the operating efficiency of the refrigerant circulation subsystem.

[0136] The aforementioned target power refers to the predicted power value of the refrigerant cycle subsystem under the aforementioned target energy efficiency.

[0137] In one embodiment, after obtaining the parameter set of the refrigerant circulation subsystem during operation, the executing entity of this application embodiment can determine the current energy efficiency and current power of the refrigerant circulation subsystem, as well as the predicted target energy efficiency and target power, based on the parameter set.

[0138] As an optional implementation, the execution entity of this application embodiment can process the preset parameters in the parameter set according to the preset processing method to obtain the current energy efficiency and current power of the refrigerant cycle subsystem.

[0139] As another optional implementation, the execution entity of this application embodiment can input the parameters from the above parameter set into a pre-trained performance test model to obtain the target energy efficiency and target power output by the performance test model. The performance test model can be a pre-trained model used to predict the highest target energy efficiency and corresponding target power that the refrigerant cycle subsystem can achieve during operation.

[0140] The specific methods for determining the current energy efficiency and power of the refrigerant cycle subsystem, as well as the predicted target energy efficiency and power, based on the aforementioned parameter set, will be explained below. Figure 8 The process shown will be explained in detail here.

[0141] Step 703: Based on the current energy efficiency, target energy efficiency, current power, and target power, determine the operating mode of the liquid storage module.

[0142] Step 704: According to the above operating mode, adjust the on / off status of the liquid inlet valve, gas balance valve, and liquid drain valve connected to the liquid storage module.

[0143] The following provides a unified explanation of steps 703 and 704:

[0144] The above operating mode refers to the operating mode corresponding to the energy efficiency of the refrigerant circulation subsystem when the energy efficiency reaches the target energy efficiency. This operating mode can be determined by the on / off state of the liquid inlet valve, gas balance valve and liquid drain valve in the liquid storage module. That is, different combinations of the on / off states of the liquid inlet valve, gas balance valve and liquid drain valve can obtain different operating modes.

[0145] Among them, through Figure 3 As can be seen from the description of the system, the operating modes of the energy storage module may include a refrigerant storage mode and a refrigerant discharge mode. Further, the refrigerant storage mode may include a rapid refrigerant storage mode (the inlet valve and the gas balance valve are open, and the drain valve is closed) and a flexible refrigerant storage mode (the inlet valve is open, and the gas balance valve and the drain valve are closed). The refrigerant discharge mode may include a rapid refrigerant discharge mode (the drain valve and the gas balance valve are open, and the inlet valve is closed) and a flexible refrigerant discharge mode (the drain valve is open, and the gas balance valve and the inlet valve are closed).

[0146] In this embodiment of the application, after determining the current energy efficiency and current power of the refrigerant circulation subsystem, as well as the predicted target energy efficiency and target power, the executing entity of this embodiment of the application can determine the operating mode of the liquid storage module based on the aforementioned current energy efficiency, current power, target energy efficiency, and target power.

[0147] Subsequently, based on this operating mode, the on / off states of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module can be adjusted. This allows for timely increases or decreases in the amount of refrigerant to the refrigerant circulation subsystem when the refrigerant circulation subsystem's energy efficiency has not reached the optimal target energy efficiency, so that the refrigerant circulation subsystem's energy efficiency can reach the target energy efficiency.

[0148] The technical solution provided in this application embodiment obtains the set of parameters involved in the operation of the refrigerant circulation subsystem in the refrigerant circulation system. Based on the set of parameters, the current energy efficiency and current power of the refrigerant circulation subsystem, as well as the predicted target energy efficiency and target power, are determined. Based on the current energy efficiency, target energy efficiency, current power, and target power, the operating mode of the liquid storage module is determined. Based on the operating mode, the on / off state of the liquid inlet valve, gas balance valve, and liquid drain valve connected to the liquid storage module is adjusted. This technical solution determines the current energy efficiency and power of the refrigerant circulation subsystem by referencing the set of parameters involved in its operation, as well as predicting the target energy efficiency and power. The various parameters included in the parameter set can more accurately predict the target energy efficiency of the refrigerant circulation subsystem. Subsequently, the operating mode of the liquid storage module can be determined based on the current energy efficiency, current power, target energy efficiency, and target power. The operation of the liquid storage module is then controlled according to the operating mode. The inlet valve, gas balance valve, and drain valve connected in the liquid storage module can control the speed of liquid inflow and outflow through different combinations of on / off states. This allows for precise control of the amount of refrigerant supplied by the liquid storage module to the refrigerant circulation subsystem, achieving more accurate control of the amount of refrigerant in the refrigerant circulation system.

[0149] See Figure 8 This is a flowchart illustrating an embodiment of a control method for a refrigerant circulation system provided in this application. Figure 8 The process shown is in Figure 7 Based on the illustrated process, this paper describes how, in the case where the refrigerant circulation subsystem includes at least one indoor module and at least one outdoor module, the specific parameters involved in the operation of the refrigerant circulation subsystem are obtained, and how the current energy efficiency and current power of the refrigerant circulation subsystem are determined based on the parameter set, as well as the target energy efficiency and target power to be predicted. Figure 8 As shown, the process may include the following steps:

[0150] Step 801: Obtain the system operation mode of the refrigerant circulation subsystem.

[0151] Step 802: Obtain the set temperature value of at least one indoor module, and obtain the indoor temperature value through the temperature sensor installed in the indoor module.

[0152] Step 803: Obtain the outdoor temperature value using the temperature sensor installed on the outdoor module.

[0153] The following provides a unified explanation of steps 801 to 803:

[0154] The aforementioned refrigerant circulation subsystem refers to a system that achieves cooling or heating functions through refrigerant, such as an air conditioning system. This refrigerant circulation subsystem may include at least one indoor module and at least one outdoor module. The indoor module can be used to cool or heat the indoor space, and the outdoor module can be used to coordinate the indoor module to achieve the same function. Figure 3 The outdoor heat exchanger shown.

[0155] The aforementioned system operation mode refers to the current operation mode of the refrigerant circulation subsystem, which can be determined by the function currently performed by the refrigerant circulation subsystem. For example, if the current function of the refrigerant circulation subsystem is to heat the room, then the system operation mode of the refrigerant circulation subsystem is the cooling mode; when the current function of the refrigerant circulation subsystem is to heat the room, the system operation mode of the refrigerant circulation subsystem is the heating mode. It may also include dehumidification mode, other modes, etc., and the embodiments of this application do not limit this.

[0156] In this embodiment of the application, during the operation of the refrigerant circulation subsystem, the executing entity of this embodiment of the application can obtain the system operation mode of the refrigerant circulation subsystem.

[0157] As an optional implementation, the executing entity in this application embodiment can determine the system operation mode of the refrigerant circulation subsystem based on the refrigerant flow direction in the refrigerant circulation subsystem. For example, when the refrigerant flow direction in the refrigerant circulation subsystem is... Figure 5 As shown, it can be determined that the system operation mode of the refrigerant circulation subsystem is cooling mode; when the refrigerant flow direction in the refrigerant circulation subsystem is... Figure 6 As shown, it can be determined that the system operation mode of the refrigerant circulation subsystem is the heating mode.

[0158] In one embodiment, the refrigerant circulation subsystem includes an indoor module and an outdoor module, on which temperature sensors can be pre-installed. Based on this, the execution subject of this application embodiment can obtain a set temperature value of at least one indoor module, obtain an indoor temperature value through the temperature sensor installed in the indoor module, and obtain an outdoor temperature value through the temperature sensor installed in the outdoor module.

[0159] As an optional implementation, if there is only one indoor module, a set temperature value and an indoor temperature value can be obtained.

[0160] As another optional implementation, when there are multiple indoor modules, multiple set temperature values ​​and multiple indoor temperature values ​​can be obtained.

[0161] As an optional implementation, if there is only one outdoor module, an outdoor temperature value can be obtained.

[0162] As another optional implementation, when there are multiple outdoor modules, multiple outdoor temperature values ​​can be obtained.

[0163] Step 804: Determine the total output energy of the indoor module.

[0164] The total output energy mentioned above refers to the total energy output by the current indoor module, which can be expressed as the total heat or total cooling output of the indoor module.

[0165] In one embodiment, the executing entity of this application embodiment can determine the total output energy of the indoor module in real time or at regular intervals during the operation of the refrigerant circulation subsystem. Specifically, if there is only one indoor module, the total output energy can be obtained directly; if there are multiple indoor modules, multiple sub-output energies can be obtained, and these sub-output energies are added together to obtain the total output energy.

[0166] As an optional implementation, the air volume and enthalpy difference of the indoor module can be obtained, and the air volume and enthalpy difference can be preset to calculate the total output energy of the indoor module.

[0167] Step 805: Obtain the first power of the indoor module and the second power of the outdoor module.

[0168] Step 806: The above operating mode, the above at least one set temperature value, the above at least one indoor temperature value, the above at least one outdoor temperature value, the above total output energy, the above first power, and the above second power are included in the parameter set.

[0169] Here is a unified explanation of steps 805 and 806:

[0170] The aforementioned first power refers to the power currently being used by the indoor module.

[0171] The aforementioned second power refers to the power currently being used by the outdoor module.

[0172] In one embodiment, the executing entity of this application embodiment may determine the first power of each indoor module and the second power of each outdoor module.

[0173] As an optional implementation, the execution entity of this application embodiment can obtain the first power of the indoor module by collecting the current and voltage of the indoor module currently in operation and multiplying the current and voltage.

[0174] As an optional implementation, the execution entity of this application embodiment can obtain the second power of the outdoor module by collecting the current and voltage of the outdoor module currently in operation and multiplying the current and voltage.

[0175] In this embodiment of the application, when the executing entity of this embodiment obtains the system operation mode of the refrigerant circulation subsystem, the set temperature value of at least one indoor module, the measured at least one indoor temperature value, the at least one outdoor temperature value, the total output energy, the first power of the indoor module, and the current second power of the outdoor module, it can classify the above-mentioned system operation mode, at least one set temperature value, at least one indoor temperature value, at least one outdoor temperature value, total output energy, the first power of the indoor module, and the second power of the outdoor module into a preset parameter set to obtain the parameter set of the refrigerant circulation subsystem.

[0176] Furthermore, if a humidity sensor is installed in the aforementioned indoor module, the current indoor humidity value can be obtained through the humidity sensor and included in the aforementioned parameter set.

[0177] Furthermore, when a humidity sensor is installed on the outdoor module, the current outdoor humidity value can be obtained through the humidity sensor and included in the parameter set.

[0178] Step 807: Input the above operating mode, at least one set temperature value, at least one indoor temperature value, and at least one outdoor temperature value into the preset performance test model to obtain the target energy efficiency and target power output by the performance test model.

[0179] The aforementioned performance testing model is a pre-trained model used to predict the highest target energy efficiency and target power that the refrigerant circulation subsystem can achieve based on the operating parameters of the refrigerant circulation subsystem.

[0180] In this embodiment of the application, the operating mode, at least one set temperature value, at least one indoor temperature value, and at least one outdoor temperature value in the parameter set can be input into a pre-trained performance test model to obtain the target energy efficiency and target power output by the performance test model.

[0181] Step 808: Add the first power and the second power to obtain the current power.

[0182] Step 809: Divide the total output energy by the current power to obtain the current energy efficiency.

[0183] The following provides a unified explanation of steps 808 and 809:

[0184] The current power mentioned above refers to the total power of all functional modules of the refrigerant circulation subsystem at present.

[0185] The aforementioned current energy efficiency refers to the ratio between the energy consumed by the refrigerant circulation subsystem during its current operation and the cooling or heating effect it provides. A high-efficiency air conditioning system consumes less energy for the same cooling capacity, and vice versa.

[0186] In one embodiment, the executing entity of this application embodiment can obtain the current power of the refrigerant circulation subsystem by adding the first power of the indoor module and the second power of the outdoor module.

[0187] In one embodiment, since the current energy efficiency refers to the ratio between the energy consumed by the refrigerant circulation subsystem during its current operation and the cooling or heating effect it provides, and the current power is the energy consumed by all functional modules, and the total output energy is the cooling or heating effect that the refrigerant circulation subsystem is to output, the current energy efficiency of the refrigerant circulation subsystem can be obtained by dividing the total output energy by the current power.

[0188] Furthermore, after obtaining the target energy efficiency, since the target energy efficiency is the highest energy efficiency that the refrigerant cycle subsystem can achieve as predicted by the performance test model, the executing entity of this application embodiment can determine whether the target energy efficiency is greater than the current energy efficiency. If so, it indicates that the target energy efficiency predicted by the performance test model is relatively accurate; if not, it indicates that the target energy efficiency predicted by the performance test model may have an error. Therefore, the performance test model can be further trained using the above parameters to improve the performance test model.

[0189] The technical solution provided in this application obtains the parameter set of the refrigerant circulation subsystem during its current operation by acquiring the system operation mode of the refrigerant circulation subsystem, the set temperature value of at least one indoor module, the indoor temperature value, the outdoor temperature value, the total output energy of the indoor module, the first power of the indoor module, and the second power of the outdoor module. It then predicts the target energy efficiency and target power of the refrigerant circulation subsystem using a pre-trained performance testing model, determines the current power of all indoor and outdoor modules within the refrigerant circulation subsystem, and divides the total output energy of the indoor modules by the current power to obtain the current energy efficiency of the refrigerant circulation subsystem. This technical solution, by acquiring multiple different parameters of the refrigerant circulation subsystem during operation and using a pre-trained performance testing model, can more efficiently and accurately determine the target energy efficiency and target power achievable by the refrigerant circulation subsystem, thereby improving the accuracy of current energy efficiency, current power, target energy efficiency, and target power, and thus enabling more accurate adjustment of the refrigerant quantity in the refrigerant circulation subsystem.

[0190] See Figure 9 This is a flowchart illustrating an embodiment of a control method for a refrigerant circulation system provided in this application. Figure 9 The process shown is in Figure 7 Based on the illustrated process, the document describes how the operating mode of the liquid storage module is determined according to the current energy efficiency, target energy efficiency, current power, and target power. For example... Figure 9 As shown, the process may include the following steps:

[0191] Step 901: Determine if the current energy efficiency is less than the target energy efficiency. If yes, proceed to step 902; otherwise, end the process.

[0192] Step 902: Compare the current power with the target power to obtain the comparison result.

[0193] Step 903: If the above comparison results indicate that the current power is less than the target power, determine the initial operating mode of the liquid storage module as the refrigerant discharge mode.

[0194] Step 904: If the comparison results indicate that the current power is greater than or equal to the target power, determine that the initial operating mode of the liquid storage module is the refrigerant storage mode.

[0195] The following provides a unified explanation of steps 901 to 904:

[0196] The aforementioned initial operating mode refers to whether the initially determined liquid storage module discharges or stores refrigerant. Therefore, the initial operating mode can be either the refrigerant discharge mode or the refrigerant storage mode.

[0197] The aforementioned refrigerant discharge mode refers to the mode in which the storage module discharges refrigerant into the refrigerant circulation subsystem. In this mode, the drain valve of the liquid storage module is open, and the inlet valve is closed.

[0198] The aforementioned refrigerant storage mode refers to the mode in which the storage module obtains and stores refrigerant from the refrigerant circulation subsystem. In this mode, the inlet valve of the liquid storage module is open and the drain valve is closed.

[0199] In this embodiment of the application, after determining the current energy efficiency and target energy efficiency of the refrigerant cycle subsystem, it can be determined whether the current energy efficiency is less than the target energy efficiency.

[0200] Optionally, if the current energy efficiency is determined to be greater than or equal to the target energy efficiency, it means that the current energy efficiency of the refrigerant circulation subsystem has reached the highest energy efficiency, and there is no need to adjust the refrigerant quantity to improve energy efficiency. At this time, the process can be terminated.

[0201] Optionally, if it is determined that the current energy efficiency is less than the target energy efficiency, it means that the current energy efficiency of the refrigerant circulation subsystem has not reached a high level and its efficiency is low. Therefore, the current power can be compared with the target power to determine the initial operating mode of the liquid storage module based on the comparison results.

[0202] As an exemplary implementation, if the comparison result indicates that the current power is less than the target power, it means that the amount of refrigerant corresponding to the current power in the refrigerant circulation subsystem has not reached the amount of refrigerant corresponding to the target power. Therefore, it can be determined that the amount of refrigerant in the refrigerant circulation subsystem can be increased. That is, the initial operating mode of the liquid storage module is the refrigerant discharge mode.

[0203] As another exemplary implementation, if the comparison result indicates that the current power is greater than or equal to the target power, it means that the amount of refrigerant corresponding to the current power in the refrigerant circulation subsystem is greater than the amount of refrigerant corresponding to the target power. Therefore, it can be determined that the amount of refrigerant in the refrigerant circulation subsystem can be reduced, that is, the initial operating mode of the liquid storage module is the refrigerant storage mode.

[0204] Step 905: Determine the comparison power range corresponding to the initial operating mode.

[0205] Step 906: Determine the operating mode of the liquid storage module based on the current power and the comparison power range mentioned above.

[0206] Step 907: According to the above operating mode, adjust the on / off status of the liquid inlet valve, gas balance valve, and liquid drain valve connected to the liquid storage module.

[0207] The following provides a unified explanation of steps 905 to 907:

[0208] The aforementioned comparison power range refers to multiple different ranges corresponding to a predetermined initial mode for comparing the current power. By comparing the current power with the comparison power range, the rate of adjustment of the refrigerant quantity can be further determined, thereby determining whether the gas balance valve of the liquid storage module needs to be opened, and thus determining the operating mode of the liquid storage module.

[0209] The above operating mode refers to the mode that includes the on / off states of all three valves in the liquid storage module: the inlet valve, the gas balance valve, and the drain valve.

[0210] In this embodiment, each operating mode can correspond to multiple different comparison power ranges. Based on this, after determining the initial operating mode of the liquid storage module, the executing entity of this embodiment can determine the comparison power range corresponding to the initial operating mode, and determine the operating mode of the liquid storage module based on the current power and the comparison power range. Then, based on the operating mode, the on / off states of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module can be adjusted.

[0211] As an optional implementation, when the initial operating mode is refrigerant discharge mode, the comparison power range corresponding to the initial operating mode may include a first refrigerant discharge power range and a second refrigerant discharge power range. The power in the first refrigerant discharge power range is less than the power in the second refrigerant discharge power range, and the power in the second refrigerant discharge power range is less than the target power. Since the current power is less than the target power in refrigerant discharge mode, the difference between the power in the first refrigerant discharge power range and the target power is larger, while the difference between the power in the second refrigerant discharge power range and the target power is smaller.

[0212] As an exemplary implementation, a first comparison threshold less than the target power can be determined. Based on this, the power in the first drainage power range can be less than the first comparison threshold, and the power in the second drainage power range can be greater than or equal to the first comparison threshold and less than the target power.

[0213] Based on this, when determining the operating mode of the liquid storage module according to the current power and the comparison power range, it can be determined whether the current power belongs to the first liquid discharge power range or the second liquid discharge power range.

[0214] Optionally, if the current power is determined to be within the first discharge power range, it indicates that the difference between the current power and the target power is large, and a large amount of refrigerant needs to be provided to the refrigerant circulation subsystem quickly. Therefore, the operating mode of the liquid storage module can be determined to be the rapid refrigerant discharge mode.

[0215] Based on this, in the rapid refrigerant discharge mode, when the execution subject of this application embodiment controls the operating state of the liquid storage module, in order to achieve the purpose of rapid refrigerant discharge, the gas balance valve can be opened to adjust the pressure in the liquid storage module to quickly discharge the refrigerant. Therefore, the liquid inlet valve connected to the liquid storage module can be closed, the gas balance valve can be opened, and the liquid discharge valve can be opened.

[0216] Optionally, if the current power is determined to be within the second discharge power range, it means that the difference between the current power and the target power is small, and less refrigerant needs to be provided to the refrigerant circulation subsystem. The discharge rate of the refrigerant to the liquid storage module should not be too fast. Therefore, the operating mode of the liquid storage module can be determined to be the flexible discharge mode.

[0217] Based on this, in the flexible refrigerant discharge mode, when the execution subject of this application embodiment controls the operating state of the liquid storage module, in order to achieve the purpose of providing less refrigerant to the refrigerant circulation subsystem, the gas balance valve can be closed so that there is a certain pressure in the liquid storage module to slowly discharge the refrigerant. Therefore, the liquid inlet valve connected to the liquid storage module can be closed, the gas balance valve can be closed, and the liquid discharge valve can be opened.

[0218] As an alternative implementation, when the initial operating mode is refrigerant storage mode, the comparison power range corresponding to the initial operating mode may include a first liquid storage power range and a second liquid storage power range. The power in the first liquid storage power range is less than the power in the second liquid storage power range, and the power in the first liquid storage power range is greater than the target power. Since in refrigerant storage mode, the current power is greater than or equal to the target power, the difference between the power in the first liquid storage power range and the target power is smaller, while the difference between the power in the second liquid storage power range and the target power is larger.

[0219] As an exemplary implementation, a second comparison threshold greater than the target power can be determined. Based on this, the power in the first liquid storage power range can be greater than the target power and less than the second comparison threshold. The power in the second liquid storage power range can be greater than or equal to the second comparison threshold.

[0220] Based on this, when determining the operating mode of the liquid storage module according to the current power and the comparison power range, it can be determined whether the current power belongs to the first liquid storage power range or the second liquid storage power range.

[0221] Optionally, if the current power is determined to be within the first liquid storage power range, it means that the difference between the current power and the target power is small, and a small amount of refrigerant needs to be obtained from the refrigerant circulation subsystem for storage. Therefore, the operating mode of the liquid storage module can be determined to be the flexible refrigerant storage mode.

[0222] Based on this, in this flexible refrigerant storage mode, when the executing entity of this application embodiment controls the operating state of the liquid storage module, in order to achieve the purpose of slowly obtaining and storing the discharged refrigerant from the refrigerant circulation subsystem, the gas balance valve can be closed so that a certain pressure buffer exists in the liquid storage module to absorb the refrigerant in the refrigerant circulation subsystem. Therefore, the liquid inlet valve connected to the liquid storage module can be opened, the gas balance valve can be closed, and the liquid drain valve can be closed.

[0223] Optionally, if the current power is determined to be within the second liquid storage power range, it indicates that the difference between the current power and the target power is large, and a large amount of refrigerant needs to be quickly obtained from the refrigerant circulation subsystem. Therefore, the operating mode of the liquid storage module can be determined to be the rapid refrigerant storage mode.

[0224] Based on this, in the rapid refrigerant storage mode, when the executing entity of this application embodiment controls the operating state of the liquid storage module, in order to achieve the purpose of quickly obtaining a large amount of refrigerant from the refrigerant circulation subsystem for storage, the gas balance valve can be opened so that there is a small pressure in the liquid storage module so that the amount of refrigerant can be quickly absorbed. Therefore, the liquid inlet valve, the gas balance valve, and the drain valve connected to the liquid storage module can be opened.

[0225] The technical solution provided in this application involves comparing the current power with the target power when the current energy efficiency is determined to be less than the target energy efficiency, obtaining a comparison result, determining the initial operating mode of the liquid storage module as the refrigerant discharge mode when the comparison result indicates that the current power is less than the target power, and determining the initial operating mode of the liquid storage module as the refrigerant storage mode when the comparison result indicates that the current power is greater than or equal to the target power. The comparison power range corresponding to the initial operating mode is determined, and the operating mode of the liquid storage module is determined based on the current power and the comparison power range. Based on the operating mode, the on / off states of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module are adjusted. This technical solution determines the initial operating mode of the liquid storage module by comparing the current power with the target power. Then, it further determines the final operating mode of the liquid storage module based on the refined comparison power range corresponding to each initial operating mode. It can determine the amount of refrigerant to be adjusted in the refrigerant circulation subsystem by comparing the current power with different power ranges. This allows for the control of the on / off states of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module. This enables a more accurate determination of the operating mode by which the liquid storage module adjusts the amount of refrigerant required in the refrigerant circulation subsystem, thereby achieving more accurate adjustment of the refrigerant amount in the cold storage system.

[0226] See Figure 10 This is a flowchart illustrating another embodiment of a control method for a refrigerant circulation system provided in this application. Figure 10 The process shown is in Figure 9 Based on the illustrated process, the runtime of the liquid storage mode operating in the defined operating mode was further determined. For example... Figure 10 As shown, the process may include the following steps:

[0227] Step 1001: After determining the operating mode of the liquid storage module based on the current power and the comparison power range, determine the target sub-power range to which the current power belongs. Each comparison power range may correspond to multiple sub-power ranges.

[0228] Step 1002: Determine the running time corresponding to the target sub-power range as the target duration.

[0229] The following provides a unified explanation of steps 1001 and 1002:

[0230] The above current power refers to Figure 7 The total power currently operating in the circulating refrigerant subsystem as determined in the process shown.

[0231] The above comparison power range refers to Figure 9In the illustrated process, the power comparison range corresponding to the initial operating mode is as follows: When the initial operating mode is refrigerant discharge mode, the corresponding power comparison range may include a first refrigerant discharge power range and a second refrigerant discharge power range, and the power in the first refrigerant discharge power range is less than the power in the second refrigerant discharge power range; when the current initial operating mode is refrigerant storage mode, the corresponding power comparison range may include a first refrigerant storage power range and a second refrigerant storage power range, and the power in the first refrigerant storage power range is less than the power in the second refrigerant storage power range. Further, the power in the second refrigerant discharge power range is less than the target power, and the power in the first refrigerant storage power range is greater than the target power.

[0232] The aforementioned target duration refers to the final determined duration of operation of the liquid storage module in the operating mode.

[0233] In this embodiment of the application, after determining the operating mode of the liquid storage module, in order to further accurately control the amount of refrigerant in the refrigerant circulation subsystem, the comparison power range corresponding to each operating mode can be further divided into multiple sub-power ranges to determine the running time of the operating mode, thereby achieving accurate control of the amount of refrigerant in the refrigerant circulation subsystem.

[0234] Based on this, each of the aforementioned comparison power intervals may include multiple sub-power intervals, and each sub-power interval may correspond to a runtime. The runtime is positively correlated with the absolute value of the difference between the sub-power intervals. The absolute value of the difference is the absolute value of the difference between any power value in the sub-power interval and the target power. That is, the larger the absolute value of the difference between the sub-power interval and the target power, the longer its runtime. For example, when the sub-power interval is greater than the target power, the sub-power interval with the larger difference from the target power has a longer runtime. When the sub-power interval is less than the target power, the sub-power interval with the smaller difference from the target power (the difference is negative) has a longer runtime.

[0235] In one embodiment, after determining the operating mode of the liquid storage module, the executing entity of this application embodiment can determine the target sub-power range to which the current power belongs, and determine the running time corresponding to the target sub-power range as the target duration.

[0236] For example, suppose the current power is P and the target power is P. t The comparison power range for each operating mode, the sub-power ranges included in each comparison power range, and the running time corresponding to each sub-power range are shown in Table 2 below:

[0237] Table 2

[0238]

[0239]

[0240] As shown in Table 1, the comparison power range corresponding to the rapid refrigerant discharge mode of the liquid storage module is (1, P). t -δP1), the sub-power intervals included in this comparison power interval may include: (0, P t -δP1-δP 11 ), [P t -δP1-δP 11 P t -δP1-δP 12 ), and [P t -δP1-δP 12 P t -δP1), further, the above (0, P t -δP1-δP 11 The corresponding runtime is T. 11 [P] t -δP1-δP 11 P t -δP1-δP 12 The corresponding runtime is T. 12 [P] t -δP1-δP 12 P t The runtime corresponding to -δP1) is T. 13 Among them, δP1 and δP 11 and δP 12 δP is the preset comparison threshold. 11 >δP 12 T 11 >T 12 >T 13 In other words, the further the current power deviates from the target power, the longer the running time will be.

[0241] The comparison range corresponding to the flexible refrigerant discharge mode of the liquid storage module can be (P) t -δP1,P t The sub-power ranges included in the comparison power range may include: (P) t -δP1,P t -δP 21 ), [P t -δP 21 P t -δP 22 ), and [P t -δP 22 P t Furthermore, the above (P) t -δP1,P t -δP 21 The corresponding runtime is T. 21 [P]t -δP 21 P t -δP 22 The corresponding runtime is T. 22 [P] t -δP 22 P t The corresponding runtime is T. 23 Among them, δP1 and δP 21 and δP 22 The preset comparison threshold is used, and δP1>δP 21 >δP 22 T 21 >T 22 >T 23 In other words, the further the current power deviates from the target power, the longer the running time will be.

[0242] The comparison range corresponding to the flexible refrigerant storage mode of the liquid storage module can be (P) t P t +δP3), the sub-power intervals included in this comparison power interval may include: (P t P t +δP 31 ), [P t +δP 31 P t +δP 32 ), and [P t +δP 32 P t +δP3), further, the above (P t P t +δP 31 The corresponding runtime is T. 31 [P] t +δP 31 P t +δP 32 The corresponding runtime is T. 32 [P] t +δP 32 P t The runtime corresponding to +δP3) is T. 33 Among them, δP3 and δP 31 and δP 32 The preset comparison threshold is used, and δP3 > δP. 32 >δP 31 T 33 >T 32 >T 31 In other words, the further the current power deviates from the target power, the longer the running time will be.

[0243] The comparison range corresponding to the rapid refrigerant storage mode of the liquid storage module can be (P) t +δP3, +∞), the sub-power intervals included in this comparison power interval may include: (P t +δP3,P t +δP3+δP 41 ), [P t +δP3+δP 41 P t +δP3+δP 42 ), and [P t +δP 32 +δP 42 ,+∞), further, the above (P t +δP3,P t +δP3+δP 41 The corresponding runtime is T. 41 [P] t +δP3+δP 41 P t +δP3+δP 42 The corresponding runtime is T. 42 [P] t +δP 32 +δP 42 The runtime corresponding to +∞) is T. 43 Among them, δP3 and δP 41 and δP 42 The preset comparison threshold is δP. 42 >δP 41 T 43 >T 42 >T 41 In other words, the further the current power deviates from the target power, the longer the running time will be.

[0244] Step 1003: Adjust the on / off status of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module according to the operating mode.

[0245] Step 1004: Maintain the liquid storage module in its current operating state for the target duration.

[0246] The following provides a unified explanation of steps 1003 and 1004:

[0247] In this embodiment of the application, after determining the running time of the operating mode, the executing entity can adjust the on / off state of the liquid inlet valve, gas balance valve, and liquid outlet valve connected to the liquid storage module according to the above operating mode, and keep the liquid storage module running in the current operating state for the above target time. This can control the adjustment speed and adjustment time of the liquid storage module on the refrigerant in the refrigerant circulation subsystem, thereby accurately controlling the amount of refrigerant in the refrigerant circulation subsystem.

[0248] The technical solution provided in this application determines the operating mode of the liquid storage module based on the current power and the comparison power range, then determines the target sub-power range to which the current power belongs. Each comparison power range can correspond to multiple sub-power ranges. The running time corresponding to the target sub-power range is determined as the target duration. Based on the operating mode, the on / off states of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module are adjusted to maintain the liquid storage module operating in the current state for the target duration. This technical solution, by comparing the current power with multiple sub-power ranges included in the comparison power range after determining the operating mode of the liquid storage module, determines the running time corresponding to the operating mode based on the sub-power range to which the current power belongs. This achieves a more accurate determination of the running time of the operating mode, thereby enabling more accurate control of the adjustment rate and duration of the liquid storage module on the refrigerant quantity in the refrigerant circulation subsystem, thus accurately controlling the refrigerant quantity in the refrigerant circulation system.

[0249] See Figure 11 The following is a flowchart of an embodiment of a control method for a refrigerant circulation system provided in this application. Figure 11 The process shown is in Figure 7 Based on the illustrated process, the control method of the refrigerant circulation system provided in this application embodiment will be explained using a multi-split air conditioning system as an example, with the refrigerant regulation subsystem as the example. Figure 11 As shown, the process may include the following steps:

[0250] (1) Read

[0251] The system uses various sensors to read the required parameters and transmit them to the calculation layer. These parameters are categorized into several types. System operating mode: primarily includes cooling or heating. Indoor set temperature Tset: the target temperature set by the user for the indoor unit; when there are multiple indoor units, these should be calculated separately. Indoor temperature Tindoor and outdoor temperature Toutdoor: indoor and outdoor units are equipped with temperature sensors to measure indoor and outdoor temperatures. When there are multiple indoor or outdoor units, these should be calculated separately. In addition to temperature, some units are also equipped with humidity sensors; the indoor humidity Hindoor and outdoor humidity Houtdoor are also read and transmitted. System capacity and power: System capacity refers to the system's cooling or heating capacity, which is the total cooling or heating output that the indoor units can provide to the indoor environment. System power requires the sum of the power data from both the indoor and outdoor sides of the system.

[0252] (2) Calculation

[0253] Substitute the relevant parameters read above into the performance prediction model to calculate the corresponding target energy efficiency. And the target power Pt.

[0254] Among them, the performance prediction model is calibrated and summarized after a large number of tests under different operating conditions in the laboratory before the unit leaves the factory. It includes the mapping relationships between various parameter conditions such as different operating modes, set temperatures, ambient temperatures, etc. and system energy efficiency and power. During the substitution calculation process, the preset parameter conditions closest to the input values are found and interpolated according to certain rules. The calculated energy efficiency and power are used as the target energy efficiency and power under the current parameter conditions of the system.

[0255] At the same time, according to the read capacity and power, the system energy efficiency is calculated by division.

[0256] (3) Judgment

[0257] First, compare the system energy efficiency and the target energy efficiency If it means that the current energy efficiency still needs to be improved to achieve the maximum energy efficiency. If it means that the current energy efficiency has reached the maximum and the system is in the optimal operating state. At this time, remember the current system operating mode, set temperature, ambient temperature and other parameter conditions and energy efficiency, and add them to the database of the performance prediction model, which can provide a reference for future refrigerant adjustment.

[0258] Then, when the energy efficiency needs to be improved, in order to determine the refrigerant adjustment direction, it is still necessary to compare the current power P and the target power Pt. If P < Pt, it means that the refrigerant in the current system is too little, and the liquid discharge function of the liquid storage tank should be activated to increase the refrigerant circulation volume in the system; if P ≥ Pt, it means that the refrigerant in the current system is too much, and the liquid storage function of the liquid storage tank should be activated to reduce the refrigerant circulation volume in the system.

[0259] After determining the basic refrigerant adjustment direction, it is still necessary to further refine the liquid discharge method or liquid storage method according to the power P. As shown in the following table, the power is divided into 4 large intervals, and each large interval can be further divided into multiple sub-intervals. The specific number of subdivisions is not limited. Here, 3 sub-intervals shown in Table 3 are taken as an example for illustration.

[0260] Table 3 (4) Action

[0261]

[0262] ① Power interval P < (Pt - δP1):

[0263] When the power is in this interval, it means that the current power is not only lower than the target power, but also far lower than the target power. Among them, δP1 is a preset value of the system. It can be seen that the refrigerant in the system is severely lacking, and the fast refrigerant discharge method should be used to quickly increase the refrigerant circulation volume in the system.

[0264] Further subdivision: when P < (Pt - δP1) - δP11, the execution time of the rapid refrigerant discharge is T11; when (Pt - δP1) - δP11 ≤ P < (Pt - δP1) - δP12, the execution time of the rapid refrigerant discharge is T12; when (Pt - δP1) - δP12 ≤ P < (Pt - δP1), the execution time of the rapid refrigerant discharge is T13. Among them, δP11 > δP12, T11 > T12 > T13, following the principle that the farther the system power deviates from the target value, the longer the adjustment duration.

[0265] ② Power range (Pt - δP1) ≤ P < Pt:

[0266] When the power is in this range, it indicates that the current power is slightly lower than the target power and the refrigerant amount in the system is slightly insufficient. Therefore, the flexible refrigerant discharge method is adopted to increase the refrigerant circulation amount in the system.

[0267] Further subdivision: when (Pt - δP1) ≤ P < Pt - δP21, the execution time of the flexible refrigerant discharge is T21; when Pt - δP21 ≤ P < Pt - δP22, the execution time of the flexible refrigerant discharge is T22; when Pt - δP22 ≤ P < Pt, the execution time of the flexible refrigerant discharge is T23. Among them, δP1 > δP21 > δP22, T11 > T12 > T13, following the principle that the farther the system power deviates from the target value, the longer the adjustment duration.

[0268] ③ Power range Pt < P < (Pt + δP3)

[0269] When the power is in this range, it indicates that the current power is slightly higher than the target power and the refrigerant amount in the system is slightly more. Therefore, the flexible refrigerant storage method is adopted to reduce the refrigerant circulation amount in the system. Among them, δP3 is the preset value of the system.

[0270] Further subdivision: when Pt ≤ P < Pt + δP31, the execution time of the flexible refrigerant storage is T31; when Pt + δP31 ≤ P < Pt + δP32, the execution time of the flexible refrigerant storage is T32; when Pt + δP32 ≤ P < (Pt + δP3), the execution time of the flexible refrigerant storage is T33. Among them, δP3 > δP32 > δP31, T33 > T32 > T31, following the principle that the farther the system power deviates from the target value, the longer the adjustment duration.

[0271] ④ Power range (Pt + δP3) ≤ P

[0272] When the power is in this range, it indicates that the current power is not only higher than the target power but also much higher than the target power. It can be seen that the refrigerant in the system is seriously excessive, and the rapid refrigerant storage method should be used to quickly reduce the refrigerant circulation amount in the system.

[0273] Further subdividing, when (Pt + δP3) ≤ P < (Pt + δP3) + δP41, the execution time of the rapid refrigerant storage is T41; when (Pt + δP3) + δP41 ≤ P < (Pt + δP3) + δP42, the execution time of the rapid refrigerant storage is T42; when (Pt + δP3) + δP42 ≤ P, the execution time of the rapid refrigerant storage is T43. Among them, δP42 > δP41, T43 > T42 > T41, following the principle that the farther the system power deviates from the target value, the longer the adjustment duration.

[0274] During adjustment, the cumulative number of adjustment cycles is counted as 1 each time an adjustment is made.

[0275] After the adjustment is completed, wait for the system to stabilize. The criterion for system stability can be judged according to a set fixed waiting time, that is, after the adjustment is completed, after waiting for a fixed duration, the system is considered to reach a new steady state. Or it can also be judged according to the fact that the system parameters no longer change, such as parameters such as the high pressure, low pressure, compressor frequency, and indoor unit expansion valve opening of the system.

[0276] After the system is stable, if the cumulative number of cycles i has not reached the upper limit value imax, that is, i < imax, (imax is the upper limit of the number of system-set adjustments) then compare the current energy efficiency and the target energy efficiency If then it means that the current energy efficiency still needs to be improved, and enter the judgment of the next refrigerant adjustment; if then it means that the current energy efficiency has been maximized and the system is in an optimal operating state. At this time, remember the parameters such as the current system operating mode, set temperature, and ambient temperature and the energy efficiency, and add them to the database of the performance prediction model, which can provide a reference for future refrigerant adjustments.

[0277] If the cumulative number of cycles i has reached the upper limit value imax, that is, i ≥ imax, it means that the target energy efficiency cannot be achieved even after adjusting to the limit. Possible reasons include: the influence of the length of the engineering installation pipeline, the influence of the installation height difference of the indoor unit, the influence of equipment aging, the influence of refrigerant leakage, etc. Record the actual energy efficiency in this case Optionally, if the system repeatedly fails to reach the target energy efficiency even after adjusting to the limit under this operating condition, then in the database of the energy efficiency prediction model, update the actually achieved energy efficiency to the target energy efficiency to guide subsequent refrigerant adjustments.

[0278] The control method of the refrigerant circulation system provided by the embodiments of the present application has the following beneficial effects:

[0279] (1) The multi-split system that can adjust the refrigerant circulation volume has an inlet valve, a drain valve and a gas balance valve, which are connected to the medium and low pressure sides of the system pipeline to ensure sufficient inlet and outlet refrigerant pressure difference. By combining valve switches and coordinating valve switching durations, the speed of refrigerant volume adjustment can be changed to meet the needs of various refrigerant adjustments.

[0280] (2) The model can calculate the target energy efficiency and target power based on actual usage, and can continuously update and correct the model based on the refrigerant adjustment results.

[0281] (3) A method for adjusting the refrigerant based on the target energy efficiency and target power, and different refrigerant adjustment methods and adjustment times can be selected based on the difference between the actual energy efficiency and the target energy efficiency, and the difference between the actual power and the target power, so as to shorten the adjustment time.

[0282] See Figure 12 This is a block diagram illustrating an embodiment of a control device for a refrigerant circulation system provided in this application. As one embodiment, this device can be applied to... Figures 1 to 3 Any of the refrigerant circulation systems shown. For example... Figure 12 As shown, the device may include:

[0283] The acquisition module 1201 is used to acquire the set of parameters involved in the operation of the refrigerant circulation subsystem in the refrigerant circulation system;

[0284] The first determining module 1202 is used to determine the current energy efficiency and current power of the refrigerant circulation subsystem, as well as the predicted target energy efficiency and target power, based on the parameter set.

[0285] The second determining module 1203 is used to determine the operating mode of the liquid storage module based on the current energy efficiency, the target energy efficiency, the current power, and the target power.

[0286] The adjustment module 1204 is used to adjust the on / off state of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module according to the operating mode.

[0287] like Figure 13 The diagram shown is a structural schematic of an electronic device provided in an embodiment of this application. It includes a processor 1301, a communication interface 1302, a memory 1303, and a communication bus 1304. The processor 1301, communication interface 1302, and memory 1303 communicate with each other via the communication bus 1304.

[0288] Memory 1303 is used to store computer programs;

[0289] In one embodiment of this application, the processor 1301, when executing a program stored in the memory 1303, implements the control method of the refrigerant circulation system provided in any of the foregoing method embodiments, including:

[0290] Obtain the set of parameters involved in the operation of the refrigerant circulation subsystem in the refrigerant circulation system;

[0291] Based on the parameter set, determine the current energy efficiency and current power of the refrigerant cycle subsystem, as well as the predicted target energy efficiency and target power.

[0292] The operating mode of the liquid storage module is determined based on the current energy efficiency, the target energy efficiency, the current power, and the target power.

[0293] According to the operating mode, adjust the on / off state of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module.

[0294] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the control method for the refrigerant circulation system provided in any of the foregoing method embodiments.

[0295] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0296] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0297] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0298] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A refrigerant circulation system, characterized in that, include: A refrigerant circulation subsystem and a liquid storage module, wherein the refrigerant circulation subsystem includes a first pressure line and a second pressure line, and the pressure of the first pressure line is greater than the pressure of the second pressure line; The liquid storage module is connected to the first pressure pipeline via a first pipeline, and an inlet valve is installed on the first pipeline; the refrigerant in the refrigerant circulation subsystem flows into the liquid storage module through the first pipeline; The liquid storage module is connected to the second pressure pipeline via a second pipeline, and a gas balance valve is installed on the second pipeline. The gaseous refrigerant in the liquid storage module flows into the refrigerant circulation subsystem through the second pipeline; the gas balance valve is used to regulate the flow rate of the refrigerant in the liquid storage module. The liquid storage module is connected to the second pressure pipeline via a third pipeline, and a drain valve is installed on the third pipeline; the liquid refrigerant in the liquid storage module flows into the refrigerant circulation subsystem through the third pipeline; The refrigerant circulation system is controlled using the following methods: Obtain the set of parameters involved in the operation of the refrigerant circulation subsystem in the refrigerant circulation system; Based on the parameter set, determine the current energy efficiency and current power of the refrigerant cycle subsystem, as well as the predicted target energy efficiency and target power. The operating mode of the liquid storage module is determined based on the current energy efficiency, the target energy efficiency, the current power, and the target power. According to the operating mode, adjust the on / off state of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module; The step of determining the operating mode of the liquid storage module based on the current energy efficiency, the target energy efficiency, the current power, and the target power includes: If it is determined that the current energy efficiency is less than the target energy efficiency, the current power is compared with the target power to obtain a comparison result; If the comparison result indicates that the current power is less than the target power, the initial operating mode of the liquid storage module is determined to be the refrigerant discharge mode; If the comparison result indicates that the current power is greater than or equal to the target power, the initial operating mode of the liquid storage module is determined to be the refrigerant storage mode; Determine the comparison power range corresponding to the initial operating mode; The operating mode of the liquid storage module is determined based on the current power and the comparison power range.

2. The refrigerant circulation system according to claim 1, characterized in that, The liquid storage module is connected to the first pipeline through the first end at the top; The liquid storage module is connected to the second pipeline via the second end at the top; The liquid storage module is connected to the third pipeline via the third end at the bottom.

3. The refrigerant circulation system according to claim 2, characterized in that, The refrigerant circulation system also includes a fourth pipeline; The first end of the fourth pipeline is connected to the first end of the top of the liquid storage module; The second end of the fourth pipeline is connected to the second pressure pipeline; An unloading valve is installed on the fourth pipeline.

4. A control method for a refrigerant circulation system, characterized in that, The method, applied to the refrigerant circulation system according to any one of claims 1 to 3, comprises: Obtain the set of parameters involved in the operation of the refrigerant circulation subsystem in the refrigerant circulation system; Based on the parameter set, determine the current energy efficiency and current power of the refrigerant cycle subsystem, as well as the predicted target energy efficiency and target power. The operating mode of the liquid storage module is determined based on the current energy efficiency, the target energy efficiency, the current power, and the target power. According to the operating mode, adjust the on / off state of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module; The step of determining the operating mode of the liquid storage module based on the current energy efficiency, the target energy efficiency, the current power, and the target power includes: If it is determined that the current energy efficiency is less than the target energy efficiency, the current power is compared with the target power to obtain a comparison result; If the comparison result indicates that the current power is less than the target power, the initial operating mode of the liquid storage module is determined to be the refrigerant discharge mode; If the comparison result indicates that the current power is greater than or equal to the target power, the initial operating mode of the liquid storage module is determined to be the refrigerant storage mode; Determine the comparison power range corresponding to the initial operating mode; The operating mode of the liquid storage module is determined based on the current power and the comparison power range.

5. The method according to claim 4, characterized in that, The refrigerant circulation subsystem includes at least one indoor module and at least one outdoor module. The indoor module is used for cooling or heating the indoor space. The acquisition of the set of parameters involved in the operation of the refrigerant circulation subsystem includes: Obtain the system operation mode of the refrigerant circulation subsystem; Obtain a set temperature value for at least one of the indoor modules, and obtain an indoor temperature value through a temperature sensor installed in the indoor module; The outdoor temperature value is obtained by a temperature sensor installed on the outdoor module; Determine the total output energy of the indoor module; Obtain the first power of the indoor module and the second power of the outdoor module; The system operating mode, at least one set temperature value, at least one indoor temperature value, at least one outdoor temperature value, the total output energy, the first power, and the second power are included in the parameter set.

6. The method according to claim 5, characterized in that, The step of determining the current energy efficiency and current power of the refrigerant cycle subsystem, as well as the predicted target energy efficiency and target power, based on the parameter set includes: The system operating mode, at least one set temperature value, at least one indoor temperature value, and at least one outdoor temperature value are input into a preset performance test model to obtain the target energy efficiency and target power output by the performance test model. The first power and the second power are added together to obtain the current power; The current energy efficiency is obtained by dividing the total output energy by the current power.

7. The method according to claim 4, characterized in that, Determining the comparison power range corresponding to the initial operating mode includes: When the initial operating mode is the refrigerant discharge mode, the comparison power range corresponding to the initial operating mode includes a first liquid discharge power range and a second liquid discharge power range; the power of the first liquid discharge power range is less than the power of the second liquid discharge power range, and the power of the second liquid discharge power range is less than the target power. Determining the operating mode of the liquid storage module based on the current power and the comparison power range includes: If it is determined that the current power belongs to the first liquid discharge power range, the operating mode of the liquid storage module is determined to be the rapid refrigerant discharge mode; If the current power is determined to be within the second discharge power range, the operating mode of the liquid storage module is determined to be the flexible refrigerant discharge mode.

8. The method according to claim 7, characterized in that, The step of adjusting the on / off states of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module according to the operating mode includes: When the liquid storage module is in the rapid refrigerant discharge mode, the liquid inlet valve connected to the liquid storage module is closed, the gas balance valve is opened, and the liquid discharge valve is opened. When the liquid storage module is in flexible refrigerant discharge mode, the liquid inlet valve connected to the liquid storage module is closed, the gas balance valve is closed, and the liquid discharge valve is opened.

9. The method according to claim 4, characterized in that, Determining the comparison power range corresponding to the initial operating mode includes: When the initial operating mode is the refrigerant storage mode, the comparison power range corresponding to the initial operating mode includes a first liquid storage power range and a second liquid storage power range; the power of the first liquid storage power range is less than the power of the second liquid storage power range, and the power of the first liquid storage power range is greater than the target power. Determining the operating mode of the liquid storage module based on the current power and the comparison power range includes: If it is determined that the current power belongs to the first liquid storage power range, the operating mode of the liquid storage module is determined to be the flexible refrigerant storage mode; If the current power is determined to be within the second liquid storage power range, the operating mode of the liquid storage module is determined to be the rapid refrigerant storage mode.

10. The method according to claim 9, characterized in that, The step of adjusting the on / off states of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module according to the operating mode includes: When the liquid storage module is in flexible refrigerant storage mode, the liquid inlet valve connected to the liquid storage module is opened, the gas balance valve is closed, and the liquid drain valve is closed. When the liquid storage module is in the rapid refrigerant storage mode, the inlet valve connected to the liquid storage module is opened, the gas balance valve is opened, and the drain valve is closed.

11. The method according to claim 7 or 9, characterized in that, Each of the comparison power intervals includes multiple sub-power intervals, and each sub-power interval corresponds to a running time; wherein, the running time is positively correlated with the absolute value of the difference between the sub-power intervals, and the absolute value of the difference is the absolute value of the difference between any power value in the sub-power interval and the target power; After determining the operating mode of the liquid storage module based on the current power and the comparison power range, the method further includes: Determine the target sub-power range to which the current power belongs; The runtime corresponding to the target sub-power range is determined as the target duration. After adjusting the on / off states of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module according to the operating mode, the method further includes: The target duration is maintained by keeping the liquid storage module running in its current operating state.

12. A control device for a refrigerant circulation system, characterized in that, The device is applied to the refrigerant circulation system according to any one of claims 1 to 3, the device comprising: The acquisition module is used to acquire the set of parameters involved in the operation of the refrigerant circulation subsystem in the refrigerant circulation system; The first determining module is used to determine the current energy efficiency and current power of the refrigerant circulation subsystem, as well as the predicted target energy efficiency and target power, based on the parameter set. The second determining module is used to determine the operating mode of the liquid storage module based on the current energy efficiency, the target energy efficiency, the current power, and the target power. The adjustment module is used to adjust the on / off state of the inlet valve, gas balance valve, and drain valve connected to the liquid storage module according to the operating mode. The step of determining the operating mode of the liquid storage module based on the current energy efficiency, the target energy efficiency, the current power, and the target power includes: If it is determined that the current energy efficiency is less than the target energy efficiency, the current power is compared with the target power to obtain a comparison result; If the comparison result indicates that the current power is less than the target power, the initial operating mode of the liquid storage module is determined to be the refrigerant discharge mode; If the comparison result indicates that the current power is greater than or equal to the target power, the initial operating mode of the liquid storage module is determined to be the refrigerant storage mode; Determine the comparison power range corresponding to the initial operating mode; The operating mode of the liquid storage module is determined based on the current power and the comparison power range.

13. An electronic device, characterized in that, include: The system includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus; the memory is used to store computer programs; and the processor, when executing the computer programs, implements the control method of the refrigerant circulation system according to any one of claims 4-11.

14. A storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the control method for the refrigerant circulation system according to any one of claims 4-11.

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