Air conditioning system and control method thereof

Abstract

The embodiment of the application discloses an air conditioning system and a control method thereof, relates to the technical field of air conditioning systems, and is used for controlling the operation frequency of a water pump to reduce energy consumption. The air conditioning system comprises a water chiller, a water pump, at least one air conditioner, at least one water valve, a differential pressure sensor group, a first temperature sensor and a second temperature sensor. A controller is configured to: acquire air conditioner operation parameters of a most unfavorable branch water circuit; wherein the most unfavorable branch water circuit is a branch water circuit in which a most unfavorable terminal air conditioner is located, and the most unfavorable terminal air conditioner is an air conditioner whose first water valve opening degree is not 0 from the end of a return water circuit; determine an energy-saving operation frequency of the water pump according to the operation parameters; and control the water pump to operate at the energy-saving operation frequency.

Description

Technical Field

[0001] This application relates to the field of air conditioning system technology, and in particular to an air conditioning system and its control method. Background Technology

[0002] As people's living standards continue to improve, their requirements for air temperature, cleanliness, humidity, and wind speed in their living and working environments are also increasing. The purpose of air conditioning systems is to meet these requirements.

[0003] However, since the air conditioning systems in most buildings vary at different times, they consume a lot of energy during long-term operation. Therefore, how to reduce the energy consumption of water pumps while ensuring comfort has become an urgent problem to be solved. Summary of the Invention

[0004] This application provides an air conditioning system and its control method for controlling the operating frequency of a water pump to reduce energy consumption.

[0005] To achieve the above objectives, this application adopts the following technical solution.

[0006] In a first aspect, embodiments of this application provide an air conditioning system, comprising: a chiller unit; a water pump connected to the chiller unit; at least one air conditioner connected to the chiller unit via a return water pipe and an inlet water pipe; at least one water valve disposed on each air conditioner for controlling the water flow rate of the return water pipe at each air conditioner; a differential pressure sensor group disposed on the most unfavorable branch water pipe for detecting the difference between the pressure of the return water pipe and the pressure of the inlet water pipe at the most unfavorable branch water pipe; a first temperature sensor disposed on the chiller unit for detecting the temperature of the main water supply pipe of the chiller unit; a second temperature sensor disposed on the most unfavorable terminal air conditioner for detecting the air supply temperature of the most unfavorable terminal air conditioner; and a controller configured to: acquire the operating parameters of the air conditioner in the most unfavorable branch water pipe; wherein the most unfavorable branch water pipe is the branch water pipe where the most unfavorable terminal air conditioner is located, and the most unfavorable terminal air conditioner is the air conditioner whose first water valve opening is not zero from the end of the return water pipe; determine the energy-saving operating frequency of the water pump based on the operating parameters; and control the water pump to operate at the energy-saving operating frequency.

[0007] The technical solution provided in this application provides at least the following beneficial effects: This technical solution determines the energy-saving operating frequency of the water pump by analyzing the operating parameters of the air conditioner on the most unfavorable branch water line, and controls the water pump to operate at the energy-saving operating frequency, thereby reducing the energy consumption of the water pump on the most unfavorable branch water line, optimizing the operating parameters of the air conditioning system, and realizing the dynamic adjustment of the operating frequency of the water pump at the most unfavorable terminal of the air conditioning system.

[0008] In some embodiments, the operation parameters include: a number of operations of the air conditioner on the most unfavorable branch water circuit, a water valve opening degree of the air conditioner on the most unfavorable branch water circuit, and a plurality of differential pressure values detected by the differential pressure sensor group; the controller is configured to determine the energy-saving operation frequency of the water pump according to the operation parameters, and specifically configured to: determine a target frequency coefficient according to the number of operations, the water valve opening degree of the air conditioner on the most unfavorable branch water circuit, and a preset weight value; determine the energy-saving operation frequency of the water pump according to the target frequency coefficient and the plurality of differential pressure values.

[0009] In some embodiments, the plurality of differential pressure values include: a first-stage differential pressure value, a middle-stage differential pressure value, and a last-stage differential pressure value of the most unfavorable branch water circuit; the controller is configured to determine the energy-saving operation frequency of the water pump according to the target frequency coefficient and the plurality of differential pressure values, and specifically configured to: in a case where the target frequency coefficient is less than or equal to a minimum value in a preset value range, determine the energy-saving operation frequency of the water pump according to the first-stage differential pressure value; in a case where the target frequency coefficient is within the preset value range, determine the energy-saving operation frequency of the water pump according to the middle-stage differential pressure value; in a case where the target frequency coefficient is greater than a maximum value in the preset value range, determine the energy-saving operation frequency of the water pump according to the last-stage differential pressure value.

[0010] In some embodiments, the operation parameters further include: a water valve opening degree of the most unfavorable terminal air conditioner, a supply water main temperature detected by a first temperature sensor, and a supply air temperature detected by a second temperature sensor; the controller is configured to determine the energy-saving operation frequency of the water pump according to the operation parameters, and specifically configured to: when the water valve opening degree of the most unfavorable terminal air conditioner is greater than a preset opening threshold, the supply water main temperature is greater than a first temperature threshold, and the supply air temperature is less than or equal to a second temperature threshold, determine a target differential pressure value of the most unfavorable terminal air conditioner according to the original differential pressure value; determine the energy-saving operation frequency of the water pump according to the target differential pressure value.

[0011] In some embodiments, the operation parameters further include: a position sequence number of the most unfavorable terminal air conditioner and a continuous operation duration of the most unfavorable terminal air conditioner; the controller is configured to determine the energy-saving operation frequency of the water pump according to the operation parameters, and specifically configured to: determine whether the most unfavorable terminal air conditioner needs differential pressure compensation according to the water valve opening degree of the most unfavorable terminal air conditioner, the position sequence number, the supply air temperature, and the continuous operation duration; when it is determined that the most unfavorable terminal air conditioner needs differential pressure compensation, determine the energy-saving operation frequency of the water pump according to the supply air temperature and the original differential pressure value.

[0012] In a second aspect, the embodiments of the present application provide a control method of an air conditioning system, comprising: obtaining an air conditioner operating parameter of a most unfavorable branch waterway; wherein the most unfavorable branch waterway is a branch waterway in which a most unfavorable terminal air conditioner is located, and the most unfavorable terminal air conditioner is an air conditioner whose first water valve opening degree is not 0 from the end of a return water pipeline; determining an energy-saving operating frequency of a water pump according to the operating parameter; and controlling the water pump to operate at the energy-saving operating frequency.

[0013] In a third aspect, the embodiments of the present application provide a controller, comprising: one or more processors; and one or more memories; wherein the one or more memories are configured to store computer program codes, the computer program codes comprising computer instructions, and when the one or more processors execute the computer instructions, the controller performs any of the control methods of the air conditioning system provided in the second aspect.

[0014] In a fourth aspect, the embodiments of the present application provide a computer readable storage medium, which comprises computer instructions, and when the computer instructions are executed on a computer, the computer executes the method provided in the second aspect and possible implementation manners.

[0015] In a fifth aspect, the embodiments of the present application provide a computer program product, which can be directly loaded into a memory and contains software codes, and the computer program product, when loaded and executed by a computer, can implement the method provided in the second aspect and possible implementation manners.

[0016] It should be noted that the computer instructions described above can be stored in the computer readable storage medium in whole or in part. The computer readable storage medium can be packaged together with the processor of the controller or packaged separately from the processor of the controller, and the present application does not limit this.

[0017] The beneficial effects of the second aspect to the fifth aspect described in the present application can be analyzed with reference to the beneficial effects of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solutions of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0019] Figure 1 An application scenario schematic diagram of an air conditioning system provided by the embodiments of the present application is shown in the following figure:

[0020] Figure 2 A distribution schematic diagram of a branch waterway provided by the embodiments of the present application is shown in the following figure:

[0021] Figure 3A schematic diagram of an air conditioning system structure provided for an embodiment of the present application;

[0022] Figure 4 A schematic diagram of a temperature sensor setting mode provided for an embodiment of the present application;

[0023] Figure 5 A schematic diagram of another temperature sensor setting mode provided for an embodiment of the present application;

[0024] Figure 6 A hardware configuration block diagram of an air conditioning system provided for an embodiment of the present application;

[0025] Figure 7 A control method flow chart of an air conditioning system provided for an embodiment of the present application;

[0026] Figure 8 A schematic diagram of another branch waterway distribution provided for an embodiment of the present application;

[0027] Figure 9 A control method flow chart of another air conditioning system provided for an embodiment of the present application;

[0028] Figure 10 A schematic diagram of another branch waterway distribution provided for an embodiment of the present application;

[0029] Figure 11 A schematic diagram of another branch waterway distribution provided for an embodiment of the present application;

[0030] Figure 12 A control method flow chart of another air conditioning system provided for an embodiment of the present application;

[0031] Figure 13 A control method flow chart of another air conditioning system provided for an embodiment of the present application;

[0032] Figure 14 A schematic diagram of another branch waterway distribution provided for an embodiment of the present application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0034] It should be noted that all the direction indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the direction indications will also change accordingly.

[0035] The terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply any relative importance or any priority of one element over another. Thus, a feature described as "first", "second", etc. can include one or more of the features. In the description of the application, unless otherwise stated and limited, the term "a plurality of" means two or more.

[0036] In the description of the application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, when describing the pipeline, the "connected" and "connected" used in the present application have the meaning of conducting. The specific meaning needs to be understood in combination with the context.

[0037] In the embodiments of the present application, the words such as "exemplary" or "for example" are used to mean an example, illustration, or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words such as "exemplary" or "for example" are intended to present the relevant concept in a specific manner.

[0038] In order to facilitate understanding, first, some terms or basic concepts of technology related to the embodiments of the present application are simply introduced and explained.

[0039] Proportional integral derivative algorithm (PID): It is a control algorithm that combines proportional, integral and derivative links. The essence of PID algorithm is to calculate according to the input deviation value according to the proportional, integral and derivative function relationship, and the calculation result is used to control the output.

[0040] It should be noted that the air conditioning system provided by the embodiments of the present application is suitable for central air conditioning in high-rise buildings. The typical central air conditioning system unit mainly consists of three parts of refrigerated water circulation system, cooling water circulation system and main machine.

[0041] In some embodiments, the chilled water circulation system is composed of a chilled pump, an indoor fan, and a chilled water pipe. The low-temperature chilled water from the main evaporator is pressurized by the chilled pump and sent to the chilled water pipe (outlet water), enters the indoor for heat exchange, takes away the heat in the room, and finally returns to the main evaporator (return water). The indoor fan is used to blow air through the chilled water pipe to reduce the air temperature and accelerate the indoor heat exchange.

[0042] In some embodiments, the cooling water circulation part is composed of a cooling pump, a cooling water pipe, and a cooling water tower. While the chilled water circulation system performs indoor heat exchange, it will inevitably take away a large amount of heat energy in the room. This heat energy is transferred to the cooling water through the refrigerant in the main machine, causing the cooling water to rise in temperature. The cooling pump pressurizes the heated cooling water into the cooling water tower (outlet water), which exchanges heat with the atmosphere, reduces the temperature, and then sends it back to the main condenser (return water).

[0043] In some embodiments, the main machine is composed of a compressor, an evaporator, a condenser, and refrigerant. The working cycle process is as follows: first, the low-pressure gaseous refrigerant is pressurized by the compressor into the condenser and gradually condensed into high-pressure liquid. During the condensation process, the refrigerant releases a large amount of heat energy, which is absorbed by the cooling water in the condenser and sent to the outdoor cooling tower, and finally released to the atmosphere.

[0044] Further, the high-pressure liquid refrigerant in the condenser is vaporized when passing through the pressure-reducing device before the evaporator, forming a gas-liquid mixture that enters the evaporator. The refrigerant continuously vaporizes in the evaporator, while absorbing the heat in the chilled water, causing the chilled water to reach a lower temperature. Finally, the vaporized refrigerant in the evaporator becomes low-pressure gas again and reenters the compressor, thus repeating the cycle.

[0045] As described above, the air conditioning system cannot automatically control the operation frequency of the water pump under the premise of ensuring comfort, reducing the energy consumption of the water pump.

[0046] Based on this, this application provides an air conditioning system, including: a chiller unit; a water pump connected to the chiller unit; at least one air conditioner connected to the chiller unit via a return water pipe and an inlet water pipe; at least one water valve installed in each air conditioner for controlling the water flow rate in the return water pipe of each air conditioner; a differential pressure sensor group installed in the most unfavorable branch water pipe for detecting the difference between the pressure in the return water pipe and the pressure in the inlet water pipe at the most unfavorable branch water pipe; a first temperature sensor installed in the chiller unit for detecting the temperature of the main water supply pipe of the chiller unit; a second temperature sensor installed in the most unfavorable terminal air conditioner for detecting the air supply temperature of the most unfavorable terminal air conditioner; and a controller configured to: acquire the operating parameters of the air conditioner in the most unfavorable branch water pipe; wherein the most unfavorable branch water pipe is the branch water pipe where the most unfavorable terminal air conditioner is located, and the most unfavorable terminal air conditioner is the air conditioner whose first water valve opening is not zero from the end of the return water pipe; determine the energy-saving operating frequency of the water pump based on the operating parameters; and control the water pump to operate at the energy-saving operating frequency.

[0047] In this way, the energy consumption of the water pump on the most unfavorable branch water line is reduced, the operating parameters of the air conditioning system are optimized, and the operating frequency of the water pump at the most unfavorable terminal of the air conditioning system is dynamically adjusted.

[0048] The embodiments provided in this application will now be described in detail with reference to the accompanying drawings.

[0049] Figure 1 This is a schematic diagram illustrating an application scenario of an air conditioning system provided in an embodiment of this application. For example... Figure 1 As shown, the high-rise building 1 may include the 1st floor, the 2nd floor, ..., the nth floor.

[0050] The first floor may include multiple households, each equipped with an air conditioner. The air conditioners between households and between floors are connected via branch water lines (…). Figure 1 (Not shown in the diagram) Connections. For example, the first layer includes air conditioners A1, ..., An; the first layer includes air conditioners B1, ..., Bn; the first layer includes air conditioners C1, ..., Cn, etc.

[0051] It should be noted that, Figure 1 The high-rise building shown in the figure has only 7 floors. In a specific implementation, the high-rise building may have more than 7 floors. This application does not limit this.

[0052] In some embodiments, Figure 1 Each air conditioner shown is equipped with a water valve. Figure 1 (Not shown in the image) is used to control the water flow rate of the return water pipes at each air conditioner.

[0053] In some embodiments, when the air conditioner is running, the associated water valve is opened to a certain degree. When the air conditioner is off, the associated water valve is closed, that is, the opening degree is 0.

[0054] In some embodiments, starting from the top floor of the high-rise building 1, which is also the end of the return water pipe, the first floor where an air conditioner is in operation is the branch water line located on that floor, which is the most unfavorable branch water line. Starting from the end of the most unfavorable branch water line, the first air conditioner with a water valve opening that is not 0 is the most unfavorable terminal air conditioner.

[0055] For example, such as Figure 1 As shown, starting from the end of the return water pipe, i.e., the nth floor of high-rise building 1, if the 6th floor is the first floor with an air conditioner in operation, then the branch water line it is located on is the most unfavorable branch water line. Starting from the end of the branch water line on the 6th floor, if the first air conditioner F3 has a non-zero water valve opening, then air conditioner F3 is the most unfavorable terminal air conditioner.

[0056] For example, starting from the nth floor of the high-rise building 1, if the 5th floor is the first floor where an air conditioner is running, then the branch water circuit where it is located is the most unfavorable branch water circuit. Starting from the end of the branch water circuit on the 5th floor, if air conditioner E4 is the first air conditioner with a water valve opening that is not 0, then air conditioner E4 is the most unfavorable terminal air conditioner.

[0057] Figure 2 This application provides a schematic diagram of the distribution of branch waterways, as shown in the embodiment. Figure 2 As shown, the return water pipeline includes multiple branch water lines, and each branch water line includes multiple air conditioners.

[0058] Taking the 7th branch water circuit as the most unfavorable branch water circuit as an example, if air conditioner G3 is detected as the first air conditioner in the branch water circuit whose water valve opening is not 0, then air conditioner G3 is the most unfavorable terminal air conditioner.

[0059] In some embodiments, a differential pressure sensor group is provided in the most unfavorable branch waterway, and the differential pressure sensor group includes: differential pressure sensor 71, differential pressure sensor 72 and differential pressure sensor 73.

[0060] Among them, the differential pressure sensor 71 is installed at the first section of the most unfavorable branch waterway and is used to detect the difference between the pressure of the return water pipe and the pressure of the inlet water pipe at the first section of the most unfavorable branch waterway.

[0061] Among them, the differential pressure sensor 72 is installed in the middle section of the most unfavorable branch waterway to detect the difference between the pressure of the return water pipe and the pressure of the inlet water pipe at the middle section of the most unfavorable branch waterway.

[0062] The differential pressure sensor 73 is arranged at the end of the most unfavorable branch waterway and is used to detect the differential pressure between the return water line pressure and the inlet water line pressure at the end of the most unfavorable branch waterway.

[0063] Figure 3 A schematic diagram of an air conditioning system structure is provided for embodiments of the present application. As shown in the figure, the air conditioning system 2 includes a return water line 10, a return water tank 11, a water pump 12, a chiller 13, an evaporator 14, an inlet water tank 15, an inlet water line 16, a cooling tower 17, a condenser 18, a water valve 19, a plurality of air conditioners 20, and a controller 1000 (not shown in the figure). Figure 3 Figure 3

[0064] In some embodiments, the return water line 10 is a line through which water flows from the return water tank 11 to the evaporator 14.

[0065] In some embodiments, the return water tank 11 is used to store water in the return water line 10.

[0066] In some embodiments, the water pump 12 is a chilled water circulation system and is a device in the water system of the air conditioning system. The water pump 12 is responsible for circulating water in the water system and can filter impurity particles in the water system, soften the quality of the inflowing water, and ensure that the air conditioning water system is not corroded and operates normally.

[0067] In some embodiments, the chiller 13 is a cooling water device that can provide constant temperature, constant flow, and constant pressure. The refrigeration machine compresses the refrigerant into a liquid state through the compressor and sends it to the evaporator 14 to exchange heat with the chilled water, refrigerates the chilled water, and the water pump 12 sends the chilled water to the cooling coil of each fan outlet, which is blown by the fan to achieve the purpose of cooling. The evaporated refrigerant releases heat in the condenser 18 to become gaseous, and the water pump 12 sends the cooling water to the cooling tower 17, which is sprayed by the water tower fan to exchange heat with the atmosphere and dissipate heat to the atmosphere.

[0068] In some embodiments, the inlet water tank 15 is used to store water in the inlet water line 16.

[0069] In some embodiments, the inlet water line 16 is a line through which water flows from the inlet water tank 15 to the evaporator 14.

[0070] In some embodiments, the cooling tower 17 is a device that uses air contact (directly or indirectly) with water to cool the water. It uses water as a circulating coolant to absorb heat from a system and discharge it to the atmosphere, thereby reducing the temperature in the tower and producing cooling water that can be recycled.

[0071] In some embodiments, the water valve 19 is used to control the flow rate of water flowing through the air conditioner branch waterway.​​

[0072] In some embodiments, the plurality of air conditioners 20, the relevant introduction about the plurality of air conditioners 20 is described above Figure 1 , which will not be repeated here.

[0073] Figure 4 A schematic diagram of a temperature sensor setting mode provided by an embodiment of the present application is shown. As Figure 4 shown, the water chiller 13 includes a first temperature sensor 131 for detecting the supply water main temperature of the water chiller 13.

[0074] In some embodiments, taking the air conditioner G2 in the plurality of air conditioners 20 as an example of the most unfavorable terminal air conditioner, Figure 5 Another schematic diagram of a temperature sensor setting mode provided by an embodiment of the present application is shown. As Figure 5 shown, the air conditioner G2 includes a second temperature sensor 201 for detecting the supply air temperature of the most unfavorable terminal air conditioner.

[0075] In the embodiments shown in the present application, the controller 1000 refers to a device that can generate operation control signals according to instruction operation codes and timing signals to instruct the air conditioning system 2 to execute control instructions. For example, the controller 1000 can be a central processing unit (CPU), a general processor network processor (NP), a digital signal processing (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller 1000 can also be other devices with processing functions, such as circuits, devices or software modules, and the embodiments of the present application do not make any limitation thereto.

[0076] In addition, the controller 1000 can be used to control the components inside the air conditioning system 2, so that each component operates to achieve the predetermined functions of the air conditioning system 2.

[0077] Figure 6 A hardware configuration block diagram of the air conditioning system 2 provided by an embodiment of the present application is shown. As Figure 6 shown, the air conditioning system 2 can also include the following two items: a memory 1002 and a communicator 1003.

[0078] The memory 1002 can be used to store software programs and data. The controller 1000 performs various functions of the air conditioning system 2 and data processing by running the software programs or data stored in the memory 1002. The memory 1002 can include a high-speed random access memory, and can also include a non-volatile memory such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state memory device. The memory 1002 stores an operating system that enables the air conditioning system 2 to operate. In this application, the memory 1002 can store an operating system and various application programs, and can also store codes for performing the control method of the air conditioning system 2 provided by the embodiments of the application.

[0079] In some embodiments, the communicator 1003 is configured to establish a communication connection with other network entities, such as a terminal device. The communicator 1003 can include a radio frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, and a GPS module, etc. Taking the RF module as an example, the RF module can be configured to receive and send signals, in particular, to send the received information to the controller 1000 for processing, and to send the signals generated by the controller 1000. Generally, the RF circuit can include, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, etc.

[0080] Those skilled in the art can understand that the hardware structure shown in the above Figure 6 The hardware structure shown in the above does not constitute a limitation on the air conditioning system, and the air conditioning system can include more or fewer components than those shown, or combine certain components, or different component arrangements.

[0081] Figure 7 A flowchart of a control method of an air conditioning system provided by an embodiment of the application is shown in FIG. 10. As shown in FIG. 10, the method includes the following steps. Figure 7

[0082] S101, the controller acquires the operating parameters of the air conditioner in the most unfavorable branch waterway.

[0083] The most unfavorable branch waterway is the branch waterway in which the most unfavorable terminal air conditioner is located, and the most unfavorable terminal air conditioner is the air conditioner whose water valve opening degree is not 0 from the end of the return water pipeline.

[0084] In some embodiments, when the air conditioner system is started, the water valve opening degree of the air conditioner is detected from the end of the return water pipeline, and the air conditioner whose water valve opening degree is not 0 is taken as the most unfavorable terminal air conditioner, and the branch waterway in which the most unfavorable terminal air conditioner is located is taken as the most unfavorable branch waterway.

[0085] For example,​Figure 8 As shown, taking a building with a total of 7 floors as an example, when the air conditioner system is started, the water valve opening degree of the air conditioner is detected from the end of the return water pipeline, i.e., the 7th floor. The air conditioner with the first water valve opening degree other than 0 is located in the 6th floor branch water pipeline, and the 6th floor branch water pipeline is the most unfavorable branch water pipeline. The air conditioner with a water valve opening degree of 10% is the most unfavorable end air conditioner.

[0086] Optionally, the operation parameters of the air conditioner in the most unfavorable branch water pipeline can include: the number of air conditioners operating in the most unfavorable branch water pipeline, the water valve opening degree of the air conditioner in the most unfavorable branch water pipeline, a plurality of differential pressure values detected by the differential pressure sensor group, the water valve opening degree of the most unfavorable end air conditioner, the total water supply pipe temperature detected by the first temperature sensor, the supply air temperature detected by the second temperature sensor, the position sequence number of the most unfavorable end air conditioner, and the continuous operation time length of the most unfavorable end air conditioner.

[0087] The plurality of differential pressure values include: a first section differential pressure value, a middle section differential pressure value, and an end section differential pressure value of the most unfavorable branch water pipeline.

[0088] As an example, detection is started from the end of the return water pipeline, i.e., the nth floor of the high-rise building 1. If the 6th floor is the first floor on which an air conditioner is in an operating state, the branch water pipeline thereof is the most unfavorable branch water pipeline. Detection is started from the end of the 6th floor branch water pipeline. The air conditioner F3 is the first air conditioner with a water valve opening degree other than 0. At this time, the air conditioner F3 is the most unfavorable end air conditioner.

[0089] As an example, detection is started from the nth floor of the high-rise building 1. If the 5th floor is the first floor on which an air conditioner is in an operating state, the branch water pipeline thereof is the most unfavorable branch water pipeline. Detection is started from the end of the 5th floor branch water pipeline. The air conditioner E4 is the first air conditioner with a water valve opening degree other than 0. At this time, the air conditioner E4 is the most unfavorable end air conditioner.

[0090] S102, the controller determines the energy-saving operation frequency of the water pump according to the operation parameters.

[0091] It should be noted that the energy-saving operation frequency is lower than other operation frequencies. The water pump operating at the energy-saving operation frequency can reduce the energy consumption of the water pump and reduce resource waste.

[0092] In some embodiments, after the controller obtains the operation parameters of the air conditioner in the most unfavorable branch water pipeline, the controller determines the energy-saving operation frequency of the water pump according to the operation parameters.

[0093] Figure 9 A method flowchart for determining the energy-saving operation frequency of the water pump is provided in the embodiments of the present application. As shown in the figure, the method comprises: Figure 9

[0094] ​S11. The controller obtains the number of air conditioners in operation, water valve opening, and multiple differential pressure values ​​on the most unfavorable branch water line.

[0095] Optionally, after the air conditioning system is started, the controller can obtain the number of air conditioners operating on the most unfavorable branch water line, the water valve opening of the air conditioners on the most unfavorable branch water line, and detect multiple differential pressure values ​​on the most unfavorable branch water line through the differential pressure sensor group.

[0096] Among them, several pressure differential values ​​include: the pressure differential value of the first section, the pressure differential value of the middle section, and the pressure differential value of the last section of the most unfavorable branch waterway.

[0097] For example, such as Figure 10 As shown, if the 7th floor branch waterway is the most unfavorable branch waterway, and the total number of air conditioners on this most unfavorable branch waterway is 8, and the number of air conditioners operating on this most unfavorable branch waterway is 5, let the water valve openings of the air conditioners on this most unfavorable branch waterway be V1, V2, V3, V4, V5, V6, V7, and V8 respectively, and let the pressure difference of the first section on this most unfavorable branch waterway be Δ. P1 The pressure difference in the middle section is Δ P2 The final pressure difference is Δ P3 .

[0098] S12. The controller determines the target frequency coefficient based on the number of operations, the water valve opening degree, and the preset weight value.

[0099] The target frequency coefficient is used to calculate the target operating frequency of the water pump.

[0100] In some embodiments, the distance between the most unfavorable branch water circuit and the chiller unit, and the direction of the return water pipeline can be processed with preset weight values.

[0101] For example, such as Figure 11 As shown, the most unfavorable branch waterway is divided into 4 equal parts, with the end to the beginning of the most unfavorable branch waterway being D1, D2, D3, and D4 respectively, and the preset weight values ​​being A1, A2, A3, and A4 respectively.

[0102] Optional, A1+A2+A3+A4=100%.

[0103] For example, A1 = 50%, A2 = 35%, A3 = 15%, and A4 = 0%.

[0104] For example, if an air conditioner with a water valve opening of V1 and an air conditioner with a water valve opening of V2 are in segment D1, an air conditioner with a water valve opening of V3 and an air conditioner with a water valve opening of V4 are in segment D2, an air conditioner with a water valve opening of V5 and an air conditioner with a water valve opening of V6 are in segment D3, and an air conditioner with a water valve opening of V7 and an air conditioner with a water valve opening of V8 are in segment D4, then the calculation method of the target frequency coefficient P is as shown in formula (1):

[0105] P=((1+A1)*(V1+V2)+(1+A2)*(V3+V4)+(1+A3)*(V5+V6)+(1+A4)*(V7+V8)) / M Formula (1)

[0106] Where M is the total number of air conditioners on the most unfavorable branch waterway, and in this case M = 8.

[0107] S13. The controller determines the energy-saving operating frequency of the water pump based on the target frequency coefficient and multiple differential pressure values.

[0108] In some embodiments, after the target frequency coefficient is calculated, the controller determines the energy-saving operating frequency of the water pump based on the target frequency coefficient and multiple differential pressure values.

[0109] In some embodiments, when the target frequency coefficient is less than or equal to the minimum value in the preset range, the energy-saving operating frequency of the water pump is determined based on the first-segment pressure difference value.

[0110] Optionally, the preset range can be (33%, 66%).

[0111] It should be noted that the preset range is set by the air conditioning system manufacturer and stored in the memory. The preset range of different manufacturers may vary, and this application does not limit it.

[0112] For example, if the target frequency coefficient P is less than or equal to the minimum value in (33%, 66%), i.e., P < 33%, then based on the first-segment pressure difference value Δ... P1 The energy-saving operating frequency of the water pump is calculated using the PID algorithm.

[0113] In some embodiments, when the target frequency coefficient is within a preset range, the energy-saving operating frequency of the water pump is determined based on the intermediate pressure difference value.

[0114] For example, if 33% < P ≤ 66%, based on the mid-section pressure difference Δ P2 The energy-saving operating frequency of the water pump is calculated using the PID algorithm.

[0115] In some embodiments, when the target frequency coefficient is greater than the maximum value in the preset range, the energy-saving operating frequency of the water pump is determined based on the final pressure difference value.

[0116] For example, if P > 66%, the water pump energy-saving operation frequency is determined according to the last-stage pressure difference value Δ P3 The water pump energy-saving operation frequency is calculated by the PID algorithm.

[0117] In some embodiments, the controller can also determine the water pump energy-saving operation frequency by the water valve opening degree of the most unfavorable terminal air conditioner, the water supply main pipe temperature, and the supply air temperature.

[0118] Figure 12 Another method for determining the water pump energy-saving operation frequency is provided in the embodiments of the present application. As shown in the flow chart, the method comprises: Figure 12

[0119] S21, the controller acquires the water valve opening degree of the most unfavorable terminal air conditioner, the water supply main pipe temperature, and the supply air temperature.

[0120] The most unfavorable terminal air conditioner is the first air conditioner with a water valve opening degree other than 0 from the end of the return water pipeline.

[0121] Optionally, after the air conditioning system is started, the controller acquires the water valve opening degree of the most unfavorable terminal air conditioner.

[0122] Optionally, after the most unfavorable terminal air conditioner operates for a preset time length, the controller can acquire the water supply main pipe temperature of the chiller through the first temperature sensor and the supply air temperature of the most unfavorable terminal air conditioner through the second temperature sensor.

[0123] S22, when the water valve opening degree of the most unfavorable terminal air conditioner is greater than a preset opening degree threshold value, the water supply main pipe temperature is greater than a first temperature threshold value, and the supply air temperature is less than or equal to a second temperature threshold value, the controller determines the target pressure difference value of the most unfavorable terminal air conditioner according to the original pressure difference value.

[0124] It should be noted that the preset opening degree threshold value, the first temperature threshold value, and the second temperature threshold value are set by the air conditioning system manufacturer and pre-stored in the memory. The preset opening degree threshold value, the first temperature threshold value, and the second temperature threshold value of different manufacturers can vary, and the present application does not limit them.

[0125] Optionally, the preset opening degree threshold value can be 90%, the first temperature threshold value can be 7℃, and the second temperature threshold value can be 19℃.

[0126] For example, when the water valve opening degree V fb of the most unfavorable terminal air conditioner is greater than the preset opening degree threshold value 90%, the water supply main pipe temperature T chst is greater than the first temperature threshold value 7℃, and the supply air temperature T sa is less than or equal to the second temperature threshold value 19℃, i.e., when V fb > 90%, T chst > 7℃, and T​sa When the temperature is ≤19℃, the controller determines the target differential pressure value for the most unfavorable terminal air conditioner based on the original differential pressure value.

[0127] It should be noted that when V fb >90%, T sa >19℃ and T chst When the temperature is ≤7℃, the temperature difference between the inlet and outlet water of the most unfavorable terminal air conditioner remains unchanged. As the load increases, the water flow rate through this point will also increase accordingly. If the system continues to operate in this state for a period of time (e.g., 20 minutes), and the water valve opening is close to 100%, but the supply air temperature still does not reach the preset temperature, then the water flow rate of the most unfavorable terminal air conditioner is insufficient, and differential pressure compensation is required for the most unfavorable branch water circuit.

[0128] In some embodiments, when differential pressure compensation is required for the most unfavorable branch waterway, the target frequency coefficient is calculated using a PID algorithm based on the supply air temperature and the second temperature threshold.

[0129] In some embodiments, after determining the target frequency coefficient, the target pressure difference value Δ is calculated based on the original pressure difference value. P bc.

[0130] Optional, target differential pressure value Δ P The calculation method for bc is shown in formula (2).

[0131] Δ Pbc =Δ Psj *(1+P1) Formula (2)

[0132] Where, Δ P sj is the original pressure difference value, P1 is the target frequency coefficient, and P1≤C (C is a constant, for example, 0.2).

[0133] S23. The controller determines the energy-saving operating frequency of the water pump based on the target differential pressure value.

[0134] In some embodiments, once the target differential pressure value is determined, the controller uses a PID algorithm to determine the energy-saving operating frequency of the water pump based on the target differential pressure value.

[0135] In some embodiments, when the water valve opening of the least favorable terminal air conditioner is less than or equal to a preset opening threshold, or when the temperature of the main water supply pipe is less than or equal to a first temperature threshold and the air supply temperature is greater than a second temperature threshold, the controller controls the water pump to maintain the current operating frequency.

[0136] For example, when V fb ≤90%, T sa ≤19℃ and T chst When the temperature is above 7℃, the controller controls the water pump to maintain the current operating frequency.

[0137] In some embodiments, the controller can also determine the energy-saving operation frequency of the water pump according to the position sequence number of the most disadvantaged terminal air conditioner and the continuous operation time length of the most disadvantaged terminal air conditioner.

[0138] Figure 13 Another method flowchart for determining the energy-saving operation frequency of the water pump is provided for the embodiments of the present application. As shown in Figure 13 , the method comprises:

[0139] S31, the controller acquires the position sequence number of the most disadvantaged terminal air conditioner and the continuous operation time length of the most disadvantaged terminal air conditioner.

[0140] For example, if the most disadvantaged terminal air conditioner is the first air conditioner with a water valve opening degree other than 0 from the end of the return water pipeline, the position sequence number of the most disadvantaged terminal air conditioner is 1; if the most disadvantaged terminal air conditioner is the third air conditioner with a water valve opening degree other than 0 from the end of the return water pipeline, the position sequence number of the most disadvantaged terminal air conditioner is 3.

[0141] Optionally, as shown in Figure 14 , taking the position sequence number of the most disadvantaged terminal air conditioner as 3 for example, the water valve opening degree V1 of the first air conditioner on the most disadvantaged branch water pipeline and the water valve opening degree V2 of the first air conditioner are both 0, i.e. V1 = 0 and V2 = 0.

[0142] S32, the controller determines whether the most disadvantaged terminal air conditioner needs differential pressure compensation according to the water valve opening degree, position sequence number, supply air temperature and continuous operation time length of the most disadvantaged terminal air conditioner.

[0143] Optionally, taking the total number of air conditioners on the most disadvantaged branch water pipeline as 8 for example, the water valve opening degrees of the air conditioners on the most disadvantaged branch water pipeline are denoted as V1, V2, V3, V4, V5, V6, V7 and V8, and the supply air temperatures of the air conditioners on the most disadvantaged branch water pipeline are denoted as T1, T2, T3, T4, T5, T6, T7 and T8.

[0144] Among them, V1 is the water valve opening degree of the most terminal air conditioner on the most disadvantaged branch water pipeline, and T1 is the supply air temperature of the most terminal air conditioner on the most disadvantaged branch water pipeline.

[0145] Further, the water valve opening degrees of other air conditioners on the most disadvantaged branch water pipeline are continuously detected, and whether the most disadvantaged terminal air conditioner needs differential pressure compensation is determined according to the water valve opening degree, position sequence number, supply air temperature and continuous operation time length of the most disadvantaged terminal air conditioner.

[0146] For example, taking the position sequence number of the most disadvantaged terminal air conditioner as 3 for example, when the water valve opening degree V i satisfies 0 < V i ≤ 50%, the supply air temperature T i of the i-th air conditioner satisfies T 1 < T i < T 8, and the continuous operation time length of the i-th air conditioner satisfies T 1 < T i < T 8, the most disadvantaged terminal air conditioner needs differential pressure compensation.i T i <T(eg.T=17℃,i=3,4,5,6,7,8),and the air conditioner on the most unfavorable branch waterway continues to run in this state for a preset time length(e.g.20 minutes),at this time the waterway load on the most unfavorable branch waterway is low and the water flow is insufficient,so differential pressure compensation is needed for the most unfavorable branch waterway.

[0147] S33,when it is determined that the most unfavorable terminal air conditioner needs differential pressure compensation,according to the supply air temperature and the original differential pressure value,the energy-saving running frequency of the water pump is determined.

[0148] In some embodiments,when it is determined that the most unfavorable terminal air conditioner needs differential pressure compensation,if the supply air temperature T sa of the most unfavorable terminal air conditioner is equal to the supply air temperature T i of the ith air conditioner,namely T sa =T i ,then according to T sa and T i ,the target frequency coefficient is calculated through a PID algorithm.

[0149] Further,when the target frequency coefficient is determined,the target differential pressure value is determined according to the original differential pressure value.

[0150] Optionally,the target differential pressure value Δ P bc is calculated according to formula(3).

[0151] Δ Pbc =T Psj *(1-P2) formula(3)

[0152] Wherein,Δ P sj is the original differential pressure value,P2 is the target frequency coefficient,and P2≤C(C is a constant,such as 0.2).

[0153] In some embodiments,when the target differential pressure value is determined,the energy-saving running frequency of the water pump is determined through a PID algorithm according to the target differential pressure value.

[0154] S103,the controller controls the water pump to run at the energy-saving running frequency.

[0155] In some embodiments,when the energy-saving running frequency of the water pump is determined,the controller controls the water pump to run at the energy-saving running frequency to achieve the purpose of energy saving of the water pump.

[0156] In some embodiments,the controller can periodically detect the water valve opening degree of each air conditioner on the most unfavorable branch waterway at a set time length,and cyclically execute the above steps S101-S103 to dynamically adjust the target running frequency of the water pump,so as to meet the water demand of the most unfavorable terminal air conditioner while reducing the energy consumption of the water pump.

[0157] The technical scheme provided by the embodiment of the application brings at least the following beneficial effects: the technical scheme determines the energy-saving operation frequency of the water pump by analyzing the operation parameter of the air conditioner on the most unfavorable branch water path, controls the water pump to operate at the energy-saving operation frequency, reduces the energy consumption of the water pump on the most unfavorable branch water path, optimizes the operation parameter of the air conditioning system, and realizes dynamic adjustment of the operation frequency of the water pump at the most unfavorable terminal of the air conditioning system.

[0158] The embodiment of the application further provides a computer readable storage medium, which comprises computer execution instructions, and when the computer execution instructions are run on a computer, the computer is caused to execute the method provided by the above embodiment.

[0159] The embodiment of the application further provides a computer program product, which can be directly loaded into a memory and contains software codes, and the computer program product can realize the method provided by the above embodiment after being loaded and executed by a computer.

[0160] Those skilled in the art can realize that the functions described in the above one or more examples can be realized by hardware, software, firmware or any combination thereof. When realized by software, the functions can be stored in a computer readable medium or transmitted as one or more instructions or codes on a computer readable medium. The computer readable medium includes a computer storage medium and a communication medium, wherein the communication medium includes any medium facilitating transmission of a computer program from one place to another. The storage medium can be any available medium accessible by a general or special purpose computer.

[0161] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional modules is taken as an example for illustration, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0162] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other manners. For example, the division of the apparatus embodiments is only illustrative and each division can not necessarily exist in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0163] In addition, each function unit in the various embodiments of the present application can be integrated into a processing unit, or each unit can exist physically as a separate unit, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software function unit. When the integrated unit is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on such an understanding, the technical solutions of the embodiments of the present application essentially, or the part that contributes to the prior art, or all or a part of the technical solutions can be embodied in the form of a software product. The software product is stored in a storage medium, and includes several instructions for causing an apparatus (which can be a single chip, a chip, etc.) or a processor to perform all or part of the steps of the methods in the various embodiments of the present application. The foregoing storage medium includes: U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk, and various other media that can store program codes.

[0164] The above is merely specific implementation of the present application, but the protection scope of the present application is not limited thereto, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An air conditioning system, characterized by, The system comprises: a water chiller; a water pump connected to the water chiller; at least one air conditioner connected to the water chiller through a return water pipeline and a water supply pipeline; at least one water valve arranged at each air conditioner for controlling the water flow of the return water pipeline at the air conditioner; a differential pressure sensor group arranged at the most unfavorable branch water pipeline for detecting the difference between the return water pipeline pressure and the water supply pipeline pressure at the most unfavorable branch water pipeline; a first temperature sensor arranged at the water chiller for detecting the water supply main pipe temperature of the water chiller; a second temperature sensor arranged at the most unfavorable terminal air conditioner for detecting the supply air temperature of the most unfavorable terminal air conditioner; a controller configured to: obtain the air conditioner operating parameters of the most unfavorable branch water pipeline; wherein the most unfavorable branch water pipeline is the branch water pipeline where the most unfavorable terminal air conditioner is located, and the most unfavorable terminal air conditioner is the air conditioner whose first water valve opening degree is not 0 from the end of the return water pipeline; the operating parameters include: the number of air conditioners on the most unfavorable branch water pipeline, the water valve opening degree of the air conditioner on the most unfavorable branch water pipeline, and a plurality of differential pressure values detected by the differential pressure sensor group; determine the energy-saving operating frequency of the water pump according to the operating parameters; control the water pump to operate at the energy-saving operating frequency; the controller is configured to determine the energy-saving operating frequency of the water pump according to the operating parameters, specifically configured to: determine a target frequency coefficient according to the number of air conditioners, the water valve opening degree of the air conditioner on the most unfavorable branch water pipeline, and a preset weight value; determine the energy-saving operating frequency of the water pump according to the target frequency coefficient and the plurality of differential pressure values; the plurality of differential pressure values include: the first segment differential pressure value, the middle segment differential pressure value, and the last segment differential pressure value of the most unfavorable branch water pipeline; the controller is configured to determine the energy-saving operating frequency of the water pump according to the target frequency coefficient and the plurality of differential pressure values, specifically configured to: in the case that the target frequency coefficient is less than or equal to the minimum value in the preset value range, determine the energy-saving operating frequency of the water pump according to the first segment differential pressure value; in the case that the target frequency coefficient is within the preset value range, determine the energy-saving operating frequency of the water pump according to the middle segment differential pressure value; in the case that the target frequency coefficient is greater than the maximum value in the preset value range, determine the energy-saving operating frequency of the water pump according to the last segment differential pressure value.

2. The air conditioning system of claim 1, wherein, the operating parameters further include: the water valve opening degree of the most unfavorable terminal air conditioner, the water supply main pipe temperature detected by the first temperature sensor, and the supply air temperature detected by the second temperature sensor; the controller is configured to determine the energy-saving operating frequency of the water pump according to the operating parameters, specifically configured to: when the water valve opening degree of the most unfavorable terminal air conditioner is greater than a preset opening degree threshold, the water supply main pipe temperature is greater than a first temperature threshold, and the supply air temperature is less than or equal to a second temperature threshold, determine the target differential pressure value of the most unfavorable terminal air conditioner according to the original differential pressure value; According to the target differential pressure value, a frequency of energy-saving operation of the water pump is determined.

3. The air conditioning system of claim 1, wherein, The operation parameter further comprises a position sequence number of the most unfavorable terminal air conditioner and a continuous operation time length of the most unfavorable terminal air conditioner. The controller is configured to determine the frequency of energy-saving operation of the water pump according to the operation parameter, and specifically configured to: According to the water valve opening degree of the most unfavorable terminal air conditioner, the position sequence number, the supply air temperature and the continuous operation time length, it is determined whether the most unfavorable terminal air conditioner needs differential pressure compensation; When it is determined that the most unfavorable terminal air conditioner needs differential pressure compensation, the frequency of energy-saving operation of the water pump is determined according to the supply air temperature and the original differential pressure value.

4. A control method of an air conditioning system, characterized by, The method is applied to the air conditioning system of any one of claims 1-3, and the method comprises: obtaining an air conditioner operation parameter of a most unfavorable branch waterway; wherein the most unfavorable branch waterway is a branch waterway where a most unfavorable terminal air conditioner is located, the most unfavorable terminal air conditioner is an air conditioner whose water valve opening degree is not 0 from the end of the return water pipeline, and the operation parameter comprises: a number of air conditioners on the most unfavorable branch waterway, a water valve opening degree of the air conditioner on the most unfavorable branch waterway, and a plurality of differential pressure values detected by the differential pressure sensor group; determining a frequency of energy-saving operation of the water pump according to the operation parameter; controlling the water pump to operate at the frequency of energy-saving operation; The method further comprises: determining a target frequency coefficient according to the number of air conditioners, the water valve opening degree of the air conditioner on the most unfavorable branch waterway, and a preset weight value; determining the frequency of energy-saving operation of the water pump according to the target frequency coefficient and the plurality of differential pressure values; the plurality of differential pressure values comprise: a first-section differential pressure value, a middle-section differential pressure value, and a last-section differential pressure value of the most unfavorable branch waterway; The method further comprises: in a case where the target frequency coefficient is less than or equal to a minimum value in a preset value range, determining the frequency of energy-saving operation of the water pump according to the first-section differential pressure value; in a case where the target frequency coefficient is within the preset value range, determining the frequency of energy-saving operation of the water pump according to the middle-section differential pressure value; in a case where the target frequency coefficient is greater than a maximum value in the preset value range, determining the frequency of energy-saving operation of the water pump according to the last-section differential pressure value.

5. The method of claim 4, wherein, The method further comprises: when the water valve opening degree of the most unfavorable terminal air conditioner is greater than a preset opening degree threshold, the total water supply pipe temperature is greater than a first temperature threshold, and the supply air temperature is less than or equal to a second temperature threshold, determining a target differential pressure value of the most unfavorable terminal air conditioner according to an original differential pressure value; determining a frequency of energy-saving operation of the water pump according to the target differential pressure value.

6. The method of claim 5, wherein, The method further comprises: determining whether the most unfavorable terminal air conditioner needs differential pressure compensation according to the water valve opening degree of the most unfavorable terminal air conditioner, a position sequence number, a supply air temperature, and a continuous operation time length; when it is determined that the most unfavorable terminal air conditioner needs differential pressure compensation, determining the frequency of energy-saving operation of the water pump according to the supply air temperature and an original differential pressure value.

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