Control method of air conditioning system, air conditioning system, storage medium and electronic equipment

Abstract

The invention provides a control method of an air conditioning system, the air conditioning system, a storage medium and electronic equipment.The method comprises the steps that working condition parameters of a first type of unit of the air conditioning system are obtained, the air conditioning system comprises the first type of unit and a second type of unit, and the power of the first type of unit is larger than that of the second type of unit; based on the working condition parameters, whether the first type of units operate in the optimal energy efficiency interval of the load rate or not is judged; and if the first type of unit does not operate in the optimal energy efficiency interval of the load rate, adjusting operation parameters of the second type of unit, so that the first type of unit operates in the optimal energy efficiency interval. The technical problem that the energy efficiency of an air conditioning system comprising a plurality of main units is low in the prior art is solved, and the overall energy efficiency of the air conditioning system is improved under the condition that the tail end requirement is maintained.

Description

Technical Field

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

[0002] In related technologies, central air-conditioning systems account for a huge proportion of energy consumption in public buildings, especially the energy consumption of chillers, which accounts for more than 50% to 80% of the energy consumption of the entire air-conditioning system. Their operating efficiency has a significant impact on the overall efficiency of the air-conditioning system.

[0003] In the related technologies, the chiller group control strategy is to add or subtract machines according to the load demand, which is prone to untimely adjustment, resulting in low-load operation of the chiller and reduced operating efficiency. In addition, for variable frequency units, the optimal load rate of operation changes with the operating pressure ratio, and it is not always maintained at a high load rate and high efficiency. At the same time, due to various reasons in actual engineering projects, the unit selection is different, and the cooling capacity is also different. This leads to the conventional method of judging the number of unit starts and stops based on the load. The same load rate control method cannot ensure that the units operate in their respective high-efficiency ranges, resulting in low overall system energy efficiency and energy waste.

[0004] With respect to the above-mentioned problems existing in the related technologies, no efficient and accurate solutions have been found yet. Summary of the invention

[0005] The present invention provides a control method for an air-conditioning system, an air-conditioning system, a storage medium, and an electronic device to solve the technical problems in the related art.

[0006] According to one embodiment of the present invention, there is provided a control method for an air-conditioning system, comprising: obtaining operating parameters of a first type of unit of the air-conditioning system, wherein the air-conditioning system comprises the first type of unit and a second type of unit, and the power of the first type of unit is greater than that of the second type of unit; judging whether the first type of unit is operating in an optimal energy efficiency range of the load rate based on the operating parameters; if the first type of unit is not operating in the optimal energy efficiency range of the load rate, adjusting the operating parameters of the second type of unit so that the first type of unit operates in the optimal energy efficiency range.

[0007] Optionally, judging whether the first type of unit is operating in the optimal energy efficiency range of the load rate based on the operating parameters includes: obtaining a unit energy efficiency model of the air-conditioning system, wherein the unit energy efficiency model includes a mapping relationship between the operating parameters and the unit load rate and the unit's maximum energy efficiency; monitoring the effective unit load rate of the first type of unit; if the effective unit load rate of the first type of unit is monitored, inputting the operating parameters and the unit load rate into the unit energy efficiency model to obtain the optimal energy efficiency range of the first type of unit; and judging whether the unit load rate is within the optimal energy efficiency range.

[0008] Optionally, monitoring the effective unit load rate of the first type of unit includes: determining the rated cooling capacity and the number of units of the first type of unit; and calculating the unit load rate of the first type of unit using the following formula: unit load rate = system cooling capacity / (rated cooling capacity*number of units).

[0009] Optionally, obtaining the unit energy efficiency model of the air-conditioning system includes: determining whether there is a unit energy efficiency model matching the operating parameters in a preset model library; if there is a unit energy efficiency model matching the operating parameters in the preset model library, retrieving the unit energy efficiency model; if there is no unit energy efficiency model matching the operating parameters in the preset model library, constructing the unit energy efficiency model using preset experimental data associated with the operating parameters.

[0010] Optionally, if the effective unit load rate of the first type of unit is not monitored, the method also includes: detecting the first guide vane opening of the first type of unit; determining whether the first guide vane opening is greater than a first preset opening; if the first guide vane opening is greater than the first preset opening, detecting the second guide vane opening of the second type of unit; determining whether the second guide vane opening is greater than the first preset opening; if the second guide vane opening is less than or equal to the first preset opening, determining whether the refrigeration pump frequency of the second type of unit is less than the maximum frequency; if the refrigeration pump frequency of the second type of unit is less than the maximum frequency, increasing the refrigeration pump frequency of the second type of unit according to the first step; if the refrigeration pump frequency of the second type of unit is equal to the maximum frequency, determining whether the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is greater than the set temperature difference; if the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is less than or equal to the set temperature difference, reducing the outlet water temperature setting value of the second type of unit according to the second step.

[0011] Optionally, after determining whether the first guide vane opening is greater than a first preset opening, the method further includes: if the first guide vane opening is less than or equal to the first preset opening, detecting the second guide vane opening of the second type of unit; determining whether the second guide vane opening is greater than the second preset opening, wherein the second preset opening is less than the first preset opening; if the second guide vane opening is greater than the second preset opening, determining whether the refrigeration pump frequency of the second type of unit is greater than the minimum frequency; if the refrigeration pump frequency of the second type of unit is greater than the minimum frequency, determining whether the difference between the outlet water temperature setting value and the system temperature setting value of the second type of unit is less than the set temperature difference; if the difference between the outlet water temperature setting value and the system temperature setting value of the second type of unit is less than the set temperature difference, reducing the refrigeration pump frequency of the second type of unit according to the third step; if the difference between the outlet water temperature setting value and the system temperature setting value of the second type of unit is greater than or equal to the set temperature difference, increasing the outlet water temperature setting value of the second type of unit according to the fourth step.

[0012] Optionally, if the unit load rate of the first type of unit is less than the minimum value of the optimal energy efficiency range, adjusting the operating parameters of the second type of unit includes: determining whether the refrigeration pump frequency of the second type of unit is greater than the minimum frequency; if the refrigeration pump frequency of the second type of unit is greater than the minimum frequency, reducing the refrigeration pump frequency of the second type of unit according to the fifth step; if the refrigeration pump frequency of the second type of unit is equal to the minimum frequency, determining whether the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference; if the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference, increasing the outlet water temperature setting value of the second type of unit according to the sixth step.

[0013] Optionally, if the unit load rate of the first type of unit is greater than the maximum value of the optimal energy efficiency range, adjusting the operating parameters of the second type of unit includes: determining whether the refrigeration pump frequency of the second type of unit is less than the maximum frequency; if the refrigeration pump frequency of the second type of unit is less than the maximum frequency, increasing the refrigeration pump frequency of the second type of unit according to the seventh step; if the refrigeration pump frequency of the second type of unit is equal to the maximum frequency, determining whether the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is greater than the set temperature difference; if the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is less than or equal to the set temperature difference, reducing the outlet water temperature setting value of the second type of unit according to the eighth step.

[0014] According to another embodiment of the present invention, there is provided an air-conditioning system, comprising: a first-category unit, a second-category unit, and a controller, wherein the power of the first-category unit is greater than that of the second-category unit, and the controller comprises: an acquisition module, for acquiring operating parameters of the first-category unit of the air-conditioning system, wherein the air-conditioning system comprises the first-category unit and the second-category unit, and the power of the first-category unit is greater than that of the second-category unit; a first judgment module, for judging whether the first-category unit is operating in an optimal energy efficiency range of the load rate based on the operating parameters; and an adjustment module, for adjusting the operating parameters of the second-category unit if the first-category unit is not operating in the optimal energy efficiency range of the load rate, so that the first-category unit operates in the optimal energy efficiency range.

[0015] Optionally, the first judgment module includes: an acquisition unit, used to acquire a unit energy efficiency model of the air-conditioning system, wherein the unit energy efficiency model includes a mapping relationship between the operating parameters and the unit load rate and the maximum energy efficiency of the unit; a monitoring unit, used to monitor the effective unit load rate of the first type of unit; an input unit, used to input the operating parameters and the unit load rate into the unit energy efficiency model if the effective unit load rate of the first type of unit is monitored, so as to obtain the optimal energy efficiency range of the first type of unit; and a judgment unit, used to judge whether the unit load rate is within the optimal energy efficiency range.

[0016] Optionally, the monitoring unit includes: a determination subunit, used to determine the rated cooling capacity and the number of units of the first type of unit; a calculation subunit, used to calculate the unit load rate of the first type of unit using the following formula: unit load rate = system cooling capacity / (rated cooling capacity*number of units).

[0017] Optionally, the acquisition unit includes: a judgment subunit, used to judge whether there is a unit energy efficiency model matching the operating parameters in the preset model library; a processing subunit, used to retrieve the unit energy efficiency model if there is a unit energy efficiency model matching the operating parameters in the preset model library; if there is no unit energy efficiency model matching the operating parameters in the preset model library, constructing the unit energy efficiency model using preset experimental data associated with the operating parameters.

[0018] Optionally, the device further includes: a first detection module, for detecting a first guide vane opening of the first type of unit if the first judgment module does not monitor an effective unit load rate of the first type of unit; a second judgment module, for judging whether the first guide vane opening is greater than a first preset opening; a second detection module, for detecting a second guide vane opening of the second type of unit if the first guide vane opening is greater than the first preset opening; a third judgment module, for judging whether the second guide vane opening is greater than the first preset opening; a fourth judgment module, for judging whether the second guide vane opening is less than or equal to the first preset opening. The first processing module is used to determine whether the freezing pump frequency of the second type of unit is less than the maximum frequency; if the freezing pump frequency of the second type of unit is less than the maximum frequency, increase the freezing pump frequency of the second type of unit according to the first step; if the freezing pump frequency of the second type of unit is equal to the maximum frequency, determine whether the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is greater than the set temperature difference; the second processing module is used to reduce the outlet water temperature setting value of the second type of unit according to the second step if the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is less than or equal to the set temperature difference.

[0019] Optionally, the device further includes: a third detection module, which is used to detect the second guide vane opening of the second type of unit if the first guide vane opening is less than or equal to the first preset opening after the second judgment module determines whether the first guide vane opening is greater than the first preset opening; a fifth judgment module, which is used to determine whether the second guide vane opening is greater than the second preset opening, wherein the second preset opening is less than the first preset opening; a sixth judgment module, which is used to determine whether the refrigeration pump frequency of the second type of unit is greater than the minimum frequency if the second guide vane opening is greater than the second preset opening; a third processing module, which is used to determine whether the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference if the refrigeration pump frequency of the second type of unit is greater than the minimum frequency; a fourth processing module, which is used to reduce the refrigeration pump frequency of the second type of unit according to the third step length if the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference; and to increase the outlet water temperature setting value of the second type of unit according to the fourth step length if the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is greater than or equal to the set temperature difference.

[0020] Optionally, if the unit load rate of the first type of unit is less than the minimum value of the optimal energy efficiency range, the adjustment module includes: a first judgment unit, used to determine whether the refrigeration pump frequency of the second type of unit is greater than the minimum frequency; a first adjustment unit, used to reduce the refrigeration pump frequency of the second type of unit according to the fifth step if the refrigeration pump frequency of the second type of unit is greater than the minimum frequency; if the refrigeration pump frequency of the second type of unit is equal to the minimum frequency, determine whether the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference; a second adjustment unit, used to increase the outlet water temperature setting value of the second type of unit according to the sixth step if the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference.

[0021] Optionally, if the unit load rate of the first type of unit is greater than the maximum value of the optimal energy efficiency range, the adjustment module includes: a second judgment unit, used to judge whether the refrigeration pump frequency of the second type of unit is less than the maximum frequency; a third adjustment unit, used to increase the refrigeration pump frequency of the second type of unit according to the seventh step if the refrigeration pump frequency of the second type of unit is less than the maximum frequency; if the refrigeration pump frequency of the second type of unit is equal to the maximum frequency, judge whether the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is greater than the set temperature difference; a fourth adjustment unit, used to reduce the outlet water temperature setting value of the second type of unit according to the eighth step if the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is less than or equal to the set temperature difference.

[0022] According to another aspect of an embodiment of the present application, a storage medium is further provided, which includes a stored program, and the above steps are executed when the program is run.

[0023] According to another aspect of an embodiment of the present application, there is also provided 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 via the communication bus; wherein: the memory is used to store computer programs; and the processor is used to execute the steps in the above method by running the program stored in the memory.

[0024] According to yet another embodiment of the present invention, a storage medium is provided, in which a computer program is stored, wherein the computer program is configured to execute the steps of any of the above-mentioned device embodiments when running.

[0025] Through the embodiment of the present invention, the operating parameters of the first type of unit of the air-conditioning system are obtained, wherein the air-conditioning system includes the first type of unit and the second type of unit, and the power of the first type of unit is greater than that of the second type of unit; based on the operating parameters, it is determined whether the first type of unit is operating in the optimal energy efficiency range of the load rate; if the first type of unit is not operating in the optimal energy efficiency range of the load rate, the operating parameters of the second type of unit are adjusted to make the first type of unit operate in the optimal energy efficiency range, thereby realizing a solution of ensuring that the first type of unit operates in the high-efficiency load rate range by adjusting the load rate of the second type of unit, avoiding the problem of low average energy efficiency caused by the same frequency control of the two types of hosts, solving the technical problem of low energy efficiency of the air-conditioning system including multiple hosts in the related technology, and improving the overall energy efficiency of the air-conditioning system while maintaining the terminal demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 is a hardware structure block diagram of an air conditioner according to an embodiment of the present invention;

[0028] Figure 2 is a flow chart of a control method of an air conditioning system according to an embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of an air conditioning system in an embodiment of the present invention;

[0030] Figure 4 is a flow chart of air conditioning energy efficiency control in an embodiment of the present invention;

[0031] Figure 5 It is a structural block diagram of an air conditioning system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] Example 1

[0035] The method embodiment provided in the first embodiment of the present application can be executed in an air conditioner, a refrigerator, a cold storage, a fresh-keeping cabinet, a refrigeration controller or a similar equipment management device. Taking the operation on an air conditioner as an example, Figure 1 FIG. 1 is a hardware structure diagram of an air conditioner according to an embodiment of the present invention. Figure 1 As shown, the air conditioner may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data. Optionally, the air conditioner may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above air conditioner. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0036] The memory 104 can be used to store air conditioning programs, for example, software programs and modules of application software, such as an air conditioning program corresponding to a control method of an air conditioning system in an embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the air conditioning program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the air conditioner via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0037] The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the air conditioner. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0038] In this embodiment, a control method for an air conditioning system is provided. Figure 2 is a flow chart of a control method of an air conditioning system according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0039] Step S202, obtaining operating parameters of a first type of unit of an air-conditioning system, wherein the air-conditioning system includes the first type of unit and a second type of unit, and the power of the first type of unit is greater than that of the second type of unit;

[0040] The air conditioning system of this embodiment can be deployed and installed in large places such as shopping malls, schools, office buildings, mines, underground machine rooms, etc.

[0041] The first type unit and the second type unit are two types of compressors in the air conditioning system, referred to as large units and small units, respectively, and are distinguished by power and cooling capacity (RT). The first type unit is larger than the second type unit. For example, the first type unit is 1000RT and the second type unit is 600RT. The number of the first type units can be one or more, and the number of the second type units can be one or more.

[0042] Optionally, the operating parameters may be the evaporating temperature and the condensing temperature. Since the parameters of the evaporating temperature and the condensing temperature of the unit are relatively easy to read, it is convenient for the system to process data. At the same time, this parameter is the parameter that most directly affects the performance of the unit. It may also be other parameters that reflect the performance of the first type of unit, such as the cooling water inlet temperature of the chiller, the freezing water outlet temperature, etc.

[0043] Optionally, the first type of unit is a permanent magnet synchronous variable frequency centrifugal machine, and the second type of unit is a permanent magnet synchronous variable frequency screw machine, or other types of compressors or combinations. For example, the first type of unit and the second type of unit can be the same type of chillers, such as both are screw machines, or both are centrifugal machines; the first type of unit and the second type of unit can be different types of chillers, such as a large unit is a centrifugal machine, a small unit is a screw machine, or other types of combinations; the first type of unit and the second type of unit can be the same type or different types of units with the same cooling capacity, such as centrifugal units with the same cooling capacity. Within the effective operating condition range, the scheme of this embodiment is used for adjustment, and priority is given to ensuring that one unit (the first type of unit) is in the high-efficiency zone, thereby ensuring that the average energy efficiency of two or more units is the highest.

[0044] Step S204, judging whether the first type of unit is operating in the optimal energy efficiency range of the load factor based on the operating condition parameters;

[0045] Step S206, if the first type of unit is not operating in the optimal energy efficiency range of the load factor, adjusting the operating parameters of the second type of unit to make the first type of unit operate in the optimal energy efficiency range;

[0046] If the first type of unit operates in the optimal energy efficiency range of the load rate, it means that the current operating conditions do not need to be adjusted and continue to be maintained until the next control cycle.

[0047] Since the energy consumption of large units (first type of units) accounts for a larger proportion than that of small units (second type of units) in equipment selection for air-conditioning systems, priority should be given to ensuring that the energy efficiency of large units is optimal (low energy consumption); in this embodiment, the load rate of small units is changed by adjusting the operating parameters of small units while the terminal demand remains unchanged to ensure that the load rate of large units is adjusted within the optimal energy efficiency range.

[0048] Optionally, the operating parameters include water pump frequency and outlet water temperature set value (the set value of the chilled water outlet temperature). It is necessary to indirectly adjust the load rate of the small unit by adjusting the corresponding water pump frequency and changing the form of water flow. When the water pump frequency cannot be adjusted, the overall load rate can also be adjusted by changing the outlet water temperature of the unit. This method can avoid directly changing the load rate of the air-conditioning unit, ensuring stable system operation and simple and reliable control.

[0049] Through the above steps, the operating parameters of the first type of unit of the air-conditioning system are obtained, wherein the air-conditioning system includes the first type of unit and the second type of unit, and the power of the first type of unit is greater than that of the second type of unit; based on the operating parameters, it is determined whether the first type of unit is operating in the optimal energy efficiency range of the load rate; if the first type of unit is not operating in the optimal energy efficiency range of the load rate, the operating parameters of the second type of unit are adjusted to make the first type of unit operate in the optimal energy efficiency range, thereby realizing a solution of ensuring that the first type of unit operates in a high-efficiency load rate range by adjusting the load rate of the second type of unit, avoiding the problem of low average energy efficiency caused by the same frequency control of two types of hosts, solving the technical problem of low energy efficiency of air-conditioning systems including multiple hosts in related technologies, and improving the overall energy efficiency of the air-conditioning system while maintaining terminal demand.

[0050] Figure 3 It is a schematic diagram of the air conditioning system in an embodiment of the present invention, including a permanent magnet synchronous variable frequency centrifugal machine (large machine), a permanent magnet synchronous variable frequency screw machine (small machine), a balance pipe, a cooling tower, a water distributor, a water collector, and both the large machine and the small machine include an evaporator, a condenser, a chilled water pump, a cooling water pump, and various sensors, among which FM-W1 is a flow sensor for the outlet water main pipe of the evaporator of the permanent magnet synchronous variable frequency centrifugal machine (large machine); FM-W2 is a flow sensor for the outlet water main pipe of the evaporator of the permanent magnet synchronous variable frequency screw machine (small machine); FM-W3 is a flow sensor for the outlet water main pipe of the condenser of the permanent magnet synchronous variable frequency centrifugal machine (large machine); FM-W4 is a flow sensor for the outlet water main pipe of the condenser of the permanent magnet synchronous variable frequency screw machine (small machine); T-W1 is a temperature sensor for the chilled water supply main pipe; T-W2 is a temperature sensor for the chilled water return main pipe Temperature sensor; T-W3 is the outlet pipe temperature sensor of the large machine evaporator; T-W4 is the inlet pipe temperature sensor of the large machine evaporator; T-W5 is the outlet pipe temperature sensor of the small machine evaporator; T-W6 is the inlet pipe temperature sensor of the small machine evaporator; T-W7 is the inlet pipe temperature sensor of the cooling tower; T-W8 is the outlet pipe temperature sensor of the cooling tower; T-W9 is the outlet pipe temperature sensor of the large machine condenser; T-W10 is the inlet pipe temperature sensor of the large machine condenser; T-W11 is the outlet pipe temperature sensor of the small machine condenser; T-W12 is the inlet pipe temperature sensor of the small machine condenser; T-W13 is the outlet pipe sensor of cooling tower 1; T-W14 is the outlet pipe sensor of cooling tower 2; P-W1 is the pressure sensor of the water distributor; P-W2 is the pressure sensor of the water collector, etc.

[0051] In one implementation of the present embodiment, judging whether the first type of unit is operating in the optimal energy efficiency range of the load rate based on the operating parameters includes: obtaining a unit energy efficiency model of the air-conditioning system, wherein the unit energy efficiency model includes a mapping relationship between the operating parameters and the unit load rate and the unit's maximum energy efficiency; monitoring the effective unit load rate of the first type of unit; if the effective unit load rate of the first type of unit is monitored, inputting the operating parameters and the unit load rate into the unit energy efficiency model to obtain the optimal energy efficiency range of the first type of unit; and judging whether the unit load rate is within the optimal energy efficiency range.

[0052] In this embodiment, the maximum energy efficiency of the unit corresponding to the operating parameters and the unit load rate is obtained in the unit energy efficiency model, a preset margin (such as 10%) is added to obtain the maximum value, and the preset margin is subtracted to obtain the minimum value. The range between the minimum value and the maximum value is the optimal energy efficiency range.

[0053] The unit equipment energy efficiency model in this embodiment is built based on the full operating parameters or performance curves of the air-conditioning system. The full operating parameters specifically refer to the load rate (such as 20% to 100%, and the operating load range of the unit under different types and different operating conditions is different), cooling capacity (kW), COP (Coefficient Of Performance, refrigeration performance coefficient / energy efficiency ratio of the refrigeration unit), power (kW), evaporator outlet water temperature (℃), evaporator inlet water temperature (℃), evaporator water flow (L / s), evaporator water pressure drop (KPA), condenser outlet water temperature (℃), condenser inlet water temperature (℃), condenser water flow (L / s), condenser water pressure drop (KPA);

[0054] An example of a unit energy efficiency model that can be built based on the above parameters is as follows:

[0055] Y=a+b*x1+c / x2+d*x1^2+e / x2^2+f*x1 / x2+g*x1^3+h / x2^3+i*x1 / x2^2+j*x1^2 / x2, (Formula 1)

[0056] Y=a+b*x1+c*x2+d*x1^2+e*x2^2+f*x1*x2+g*x1^3+h*x2^3+i*x1*x2^2+j*x1^2*x2, (Formula 2)

[0057] Among them, a, b, c, d, e, f, g, h, i, j are load correction factors, Y is the unit COP, x1 is the load rate, x2 is the cooling water inlet temperature of the chiller (it can also be replaced by other operating parameters). The energy efficiency models are different for different types of units and different operating conditions. The above is an example of the energy efficiency model of an air-conditioning system.

[0058] Based on the unit energy efficiency model, the optimal energy efficiency range is determined by the evaporation temperature Tw and the condensation temperature Tc (or other types of operating parameters), where the chilled water outlet temperature = Tw + ΔT1, and the cooling water inlet temperature = Tc-ΔT2-ΔT3; where ΔT1 is the end difference on the evaporation side (the default is 2°C), ΔT2 is the end difference on the condensation side (the default is 2°C), and ΔT3 is the supply and return water temperature difference on the cooling side (the default is 5°C). When the evaporation temperature is known, that is, the chilled water outlet temperature is determined, the COP of the unit can be determined by the unit load rate and the cooling water inlet temperature. The maximum COP value corresponding to the load rate range of the entire unit operating condition (such as 20% to 100%, determined according to the actual unit operating condition) is the highest energy efficiency of the unit under this condition (corresponding to the operating condition parameters and the unit load rate). The unit load rate X corresponding to the maximum COP value is the high-efficiency load rate, and the high-efficiency range is X±10%, that is, the upper limit is Xmax and the lower limit is Xmmin.

[0059] By adopting the solution of this embodiment, a method for determining the high-efficiency range of the unit is proposed. An energy efficiency mathematical model is built based on the full operating parameters or full operating curves of the unit, and the optimal energy efficiency range is determined based on the load rate and operating parameters. Since the load rate of the unit is easier to obtain than other parameters, the difficulty of processing the system operation data is reduced, and the accuracy of the high-efficiency range of the unit is improved.

[0060] In one example, monitoring the effective unit load rate of the first type of unit includes: determining the rated cooling capacity and the number of units of the first type of unit; calculating the unit load rate of the first type of unit using the following formula: unit load rate = system cooling capacity / (rated cooling capacity*number of units).

[0061] In this example, if the sensor fails or the controller fails, the effective unit load rate may not be obtained. Unit load rate = system cooling capacity / (unit rated cooling capacity * number of units), (where the system cooling capacity Q is obtained by calculation, through the formula Q = CMΔT4, C is the liquid specific heat capacity, M is the water flow rate, ΔT4 is the supply and return water temperature difference on the refrigeration side), if the system is installed with sensors and there is no failure (failure, data drift, etc.), then the effective unit load rate can be monitored.

[0062] By adopting the solution of this example, the system cooling capacity is calculated in real time through the refrigeration parameters (water flow, supply and return water temperature difference on the refrigeration side) collected by sensors, avoiding the failure of the system cooling capacity due to sensor failure and other reasons, and improving the accuracy of the unit load rate.

[0063] In this embodiment, obtaining the unit energy efficiency model of the air-conditioning system includes: determining whether there is a unit energy efficiency model matching the operating parameters in the preset model library; if there is a unit energy efficiency model matching the operating parameters in the preset model library, retrieving the unit energy efficiency model; if there is no unit energy efficiency model matching the operating parameters in the preset model library, constructing the unit energy efficiency model using preset experimental data associated with the operating parameters.

[0064] After obtaining the operating parameters (evaporation temperature and condensation temperature), determine whether there is a matching unit energy efficiency model. If so, calculate the optimal energy efficiency range [Xmin, Xmax] of the unit through the energy efficiency model. If not, re-build the model based on the full operating data of the manufacturer's experimental test.

[0065] In order to avoid excessive data storage, several energy efficiency models under normal working conditions are saved in the preset model library, such as the working conditions of the chilled water outlet temperature Tgi of 6 / 7 / 8 / 9°C, the cooling water inlet temperature Tqi of 18-32°C, and the load rate range of 20%-100%. The working condition strategy table is shown in Table 1 below:

[0066] Table 1

[0067]

[0068] By adopting the solution of this embodiment, several conventional operating conditions are designed first to build a strategy table. When encountering unconventional operating conditions, the operating condition strategy table is automatically supplemented. This can avoid the problem of a large data storage library and a long time spent traversing the operating conditions. At the same time, it can ensure that the conventional operating conditions can determine the unit's high-efficiency range in a timely manner, thereby improving the speed of determining the unit's high-efficiency range.

[0069] In an implementation scenario of the present embodiment, if the effective unit load rate of the first type of unit is not monitored, it also includes: detecting the first guide vane opening of the first type of unit; determining whether the first guide vane opening is greater than the first preset opening; if the first guide vane opening is greater than the first preset opening, detecting the second guide vane opening of the second type of unit; determining whether the second guide vane opening is greater than the first preset opening; if the second guide vane opening is less than or equal to the first preset opening, determining whether the refrigeration pump frequency of the second type of unit is less than the maximum frequency; if the refrigeration pump frequency of the second type of unit is less than the maximum frequency, increasing the refrigeration pump frequency of the second type of unit according to the first step; if the refrigeration pump frequency of the second type of unit is equal to the maximum frequency, determining whether the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is greater than the set temperature difference; if the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is less than or equal to the set temperature difference, reducing the outlet water temperature setting value of the second type of unit according to the second step.

[0070] If a system sensor fails, resulting in the failure to monitor the effective unit load rate of the first type of unit, the following strategy is adopted to adjust the operating parameters of the second type of unit so that the first type of unit operates in the optimal energy efficiency range: In an example of this embodiment, it is judged whether the main guide vane opening Ad > 90% holds. If so, it is judged whether the auxiliary guide vane opening Ax > 90% holds. If so, it means that the current working condition does not need to be adjusted, and the judgment process is restarted at an interval time t2. If not, it is judged whether there is room for the auxiliary chiller pump frequency fxi to increase, that is, whether fxi < fmax holds. If so, the auxiliary chiller pump frequency is increased by 2 Hz. After a time t1, where t1 is generally defaulted to 3 minutes, the decrease in the COP of the air conditioning system is judged. If not, it is judged whether the set value of the auxiliary chiller outlet water temperature Tgxi < the system temperature set value Tgx0 - T holds, where T is the set temperature difference, generally defaulted to 2°C. If so, it means that the current working condition cannot be adjusted, and the judgment process is restarted at an interval time t2, where t2 is generally defaulted to 5 minutes, that is, return and enter the next control cycle. If not, the set value of the auxiliary chiller outlet water temperature Tgxi is decreased by a temperature difference ΔT7, where ΔT7 is the set temperature difference value, generally defaulted to 0.5°C. After an interval time t1, the decrease in the COP of the air conditioning system is judged.

[0071] In an embodiment of the above implementation scenario, after judging whether the first guide vane opening is greater than the first preset opening, it further includes: If the first guide vane opening is less than or equal to the first preset opening, detect the second guide vane opening of the second type of unit; judge whether the second guide vane opening is greater than the second preset opening, where the second preset opening is less than the first preset opening; if the second guide vane opening is greater than the second preset opening, judge whether the chiller pump frequency of the second type of unit is greater than the minimum frequency; if the chiller pump frequency of the second type of unit is greater than the minimum frequency, judge whether the difference between the set value of the outlet water temperature of the second type of unit and the system temperature set value is less than the set temperature difference; if the difference between the set value of the outlet water temperature of the second type of unit and the system temperature set value is less than the set temperature difference, reduce the chiller pump frequency of the second type of unit according to the third step length; if the difference between the set value of the outlet water temperature of the second type of unit and the system temperature set value is greater than or equal to the set temperature difference, increase the set value of the outlet water temperature of the second type of unit according to the fourth step length.

[0072] In an example of this embodiment, in the scenario where the first guide vane opening is less than or equal to the first preset opening, it is determined whether the guide vane opening Ax>40% of the small machine is established. If not, it means that the current working condition cannot be adjusted, and the interval time t2 is re-executed to re-execute the judgment process, t2 is generally defaulted to 5min, and enter the next control cycle; if so, it is determined whether the frequency fxi of the small machine refrigeration pump has a frequency reduction space, that is, whether fxi>fmin is established? If not, it means that the current working condition cannot be adjusted, and the interval time t2 is re-executed to re-execute the judgment process, t2 is generally defaulted to 5min, that is, enter the next control cycle; if so, it is determined whether the water outlet temperature setting value Tgxi of the small machine is < the system temperature setting value Tgx0+T is established? T is the set temperature difference, which is generally 2°C by default. If so, the frequency fxi of the small unit's refrigeration pump is reduced by 2Hz, and after a time of t1, t1 is generally 3min by default, to determine the decrease in the COP of the air-conditioning system; if not, the set value Tgxi of the small unit's outlet water temperature is increased by 0.5°C, and after a time of t1, t1 is generally 3min by default, to determine the decrease in the COP of the air-conditioning system.

[0073] The implementation method of this embodiment realizes a defense method for air-conditioning system sensor failure, so as to avoid accidents such as unstable unit operation and low energy efficiency caused by the inability to timely calculate the system load rate when the system sensor fails or the sensor is missing. The outlet water temperature and water pump frequency of the second type of unit are adjusted based on the guide vane opening of the unit to ensure that the first type of unit operates in the high-efficiency zone, effectively improving the system stability while ensuring the system efficiency, and improving the robustness of air-conditioning energy efficiency control.

[0074] In one implementation of the present embodiment, if the unit load rate of the first type of unit is less than the minimum value of the optimal energy efficiency range, adjusting the operating parameters of the second type of unit includes: determining whether the refrigeration pump frequency of the second type of unit is greater than the minimum frequency; if the refrigeration pump frequency of the second type of unit is greater than the minimum frequency, reducing the refrigeration pump frequency of the second type of unit according to the fifth step; if the refrigeration pump frequency of the second type of unit is equal to the minimum frequency, determining whether the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference; if the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference, increasing the outlet water temperature setting value of the second type of unit according to the sixth step.

[0075] In an example based on this embodiment, it is judged whether the large machine load rate Xi < Xmin holds. If so, it is judged whether there is a frequency reduction space for the small machine chilled water pump frequency, that is, whether fxi > fmin holds. If so, the frequency of the small machine chilled water pump is reduced by 2 Hz. After a time t1, which is generally defaulted to 3 minutes, the following steps are executed: judge the decrease of the COP of the air conditioning system; if not, judge whether the set value of the small machine outlet water temperature Tgxi < the system temperature set value Tgx0 + T holds? T is the set temperature difference, generally defaulted to 2 °C. If not, it means that the current working condition cannot be adjusted, and the judgment process is restarted at an interval of t2, which is generally defaulted to 5 minutes, that is, return and enter the next control cycle; if so, the set value of the small machine outlet water temperature Tgxi is increased by a temperature ΔT5, where ΔT5 is the set temperature difference value, generally defaulted to 0.5 °C. After an interval of t1, judge the decrease of the COP of the air conditioning system.

[0076] This embodiment realizes the matching scheme of the large and small machines when the energy efficiency of the first type of unit is less than the lower limit value of the optimal energy efficiency range. When preferentially determining the high-efficiency range of the first type of unit, the outlet water temperature of the second type of unit or the chilled water pump frequency of the second type of unit is dynamically adjusted to ensure that the first type of unit always operates in the high-efficiency area, improve the average energy efficiency of the unit, and avoid the problem of low average energy efficiency of the air-conditioning main unit caused by the same-frequency control of traditional large and small unit equipment.

[0077] In another embodiment of this example, if the unit load rate of the first type of unit is greater than the maximum value of the optimal energy efficiency range, adjusting the operating parameters of the second type of unit includes: judging whether the chilled water pump frequency of the second type of unit is less than the maximum frequency; if the chilled water pump frequency of the second type of unit is less than the maximum frequency, increasing the chilled water pump frequency of the second type of unit by the seventh step size; if the chilled water pump frequency of the second type of unit is equal to the maximum frequency, judging whether the difference between the system temperature set value and the set value of the outlet water temperature of the second type of unit is greater than the set temperature difference; if the difference between the system temperature set value and the set value of the outlet water temperature of the second type of unit is less than or equal to the set temperature difference, reducing the set value of the outlet water temperature of the second type of unit by the eighth step size.

[0078] In an example based on this embodiment, it is judged whether the large machine load rate Xi > Xmax holds. If so, it is judged whether there is room for increasing the frequency of the small machine cooling pump, that is, whether fxi < fmax holds. If so, the frequency of the small machine cooling pump is increased by 2 Hz. After a time t1, which is generally defaulted to 3 min, the following steps are executed: judge the decrease in the COP of the air conditioning system; if not, judge whether the set value of the small machine outlet water temperature Tgxi < the system temperature set value Tgx0 - T holds. T is the set temperature difference, generally defaulted to 2 °C. If so, it means that the current working condition cannot be adjusted, and the judgment process is restarted after an interval time t2, which is generally defaulted to 5 min, that is, return and enter the next control cycle; if not, the set value of the small machine outlet water temperature Tgxi is decreased by a temperature ΔT6, where ΔT6 is the set temperature difference value, generally defaulted to 0.5 °C. After an interval time t1, judge the decrease in the COP of the air conditioning system.

[0079] This embodiment realizes the matching scheme of the large and small machines when the energy efficiency of the first type of unit is greater than the upper limit value of the optimal energy efficiency interval. When preferentially determining the high-efficiency interval of the first type of unit, the outlet water temperature of the second type of unit or the frequency of the cooling pump of the second type of unit is dynamically adjusted to ensure that the first type of unit always operates in the high-efficiency area, improve the average energy efficiency of the unit, and avoid the problem of low average energy efficiency of the air-conditioning main unit caused by the same-frequency control of traditional large and small unit equipment.

[0080] This embodiment generally provides a control method and device for adapting the high-efficiency area of a large and small machine system. Based on the full-condition performance parameters or curves of the unit equipment, an equipment model library of the chiller is built to determine the high-efficiency interval of the chiller under different working conditions, and the outlet water temperature of the small machine and the corresponding cooling pump frequency of the small machine are adjusted according to this interval to ensure that the large machine equipment always operates in the high-efficiency interval. Aiming at the problem of low energy efficiency of the conventional group control system using the same-frequency adjustment according to the load change, the operating parameters of the system can be dynamically adjusted to improve the energy efficiency of the unit by 5% - 10%. Figure 4 It is the flowchart of the air-conditioning energy efficiency control in the embodiment of the present invention, including:

[0081] Step 1: Real-time collect the chilled water outlet temperature Tgi of the chilled water main pipe, the return water temperature Thi of the chilled water in the chilled water main pipe, the cooling water inlet temperature Tqi of the cooling water main pipe, the evaporation temperature Twi and the condensation temperature Tci of the large unit, the outdoor wet bulb temperature Wai, the frequency fxi of the small machine cooling pump, the maximum frequency fmax of the small machine cooling pump, the minimum set frequency fmin of the small machine cooling pump, the supply water temperature Tgxi of the small machine, the set value Tgx0 of the small machine supply water temperature, the guide vane opening Ad of the large machine, and the guide vane opening Ax of the small machine through the group control system;

[0082] Step 2: Read the evaporation temperature Twi and the condensation temperature Tci of the large unit at the current moment;

[0083] Step 3: Under the evaporation temperature, condensation temperature, and unit load rate conditions in Step 2, determine whether there is a unit energy efficiency model. If not, execute Step 4; if so, execute Step 5. (To avoid excessive data storage, it is generally default to save several energy efficiency models under normal operating conditions. For example, for chiller chilled water supply temperature of 6 / 7 / 8 / 9 °C and other conditions, cooling water inlet temperature of 18 - 32 °C, and load rate range of 20% - 100% conditions);

[0084] Step 4: If the system operating conditions are not within the existing energy efficiency operating condition strategy table range, then re-build the model based on the full-condition data from the manufacturer's experimental tests, establish a data model library in the form of Equation 1 and Equation 2, update the strategy table, and re-execute Step 5;

[0085] Step 5: Calculate the optimal energy efficiency interval [Xmin, Xmax] of the unit through the energy efficiency model;

[0086] Step 6: Determine whether the known unit load rate is valid. Unit load rate = system refrigerating capacity / (rated refrigerating capacity of the unit * number of units), (where the system refrigerating capacity Q is obtained through calculation, and through the classical formula Q = CMΔT4, C is the specific heat capacity of the liquid, M is the water flow rate, and ΔT4 is the temperature difference between the supply and return water on the chilled side). If the system is equipped with sensors and no faults (failure, data drift, etc.) occur, then execute Step 7; if a system sensor fails, then execute Step 15;

[0087] Step 7: Determine whether the large machine load rate Xi < Xmin holds. If so, execute Step 8; if not, execute Step 11;

[0088] Step 8: Determine whether there is room for frequency reduction of the small machine chilled water pump, that is, whether fxi > fmin holds? If so, the frequency of the small machine chilled water pump is reduced by 2 Hz. After a time t1, t1 is generally default to 3 min, and execute Step 24; if not, execute Step 9;

[0089] Step 9: Determine whether the set value of the small machine outlet water temperature Tgxi < the system temperature set value Tgx0 + T holds? T is the set temperature difference, generally default to 2 °C. If not, it means that the current operating condition cannot be adjusted, and the judgment process is re-executed at an interval of time t2. t2 is generally default to 5 min, that is, return to Step 1; if so, execute Step 10;

[0090] Step 10: The set value of the small machine outlet water temperature Tgxi is increased by the temperature ΔT5, where ΔT5 is the set temperature difference value, generally default to 0.5 °C, and execute Step 24 at an interval of time t1;

[0091] Step 11: Determine whether the large machine load rate Xi > Xmax holds. If not, it means that the current working condition does not need to be adjusted, and the judgment process is restarted after an interval time t2, that is, return to Step 1. If so, execute Step 12;

[0092] Step 12: Determine whether there is room for increasing the frequency of the small machine's refrigeration pump, that is, whether fxi < fmax holds. If so, increase the frequency of the small machine's refrigeration pump by 2 Hz. After a time t1, t1 is generally defaulted to 3 minutes, and execute Step 24. If not, execute Step 13;

[0093] Step 13: Determine whether the set value of the small machine's outlet water temperature Tgxi < the system temperature set value Tgx0 - T holds. T is the set temperature difference, generally defaulted to 2 °C. If so, it means that the current working condition cannot be adjusted, and the judgment process is restarted after an interval time t2, t2 is generally defaulted to 5 minutes, that is, return to Step 1. If not, execute Step 14;

[0094] Step 14: Decrease the set value of the small machine's outlet water temperature Tgxi by a temperature ΔT6, where ΔT6 is the set temperature difference value, generally defaulted to 0.5 °C, and execute Step 24 after an interval time t1;

[0095] Step 15: Determine whether the guide vane opening of the large machine Ad > 90% holds. If so, execute Step 16. If not, execute Step 20;

[0096] Step 16: Determine whether the guide vane opening of the small machine Ax > 90% holds. If so, it means that the current working condition does not need to be adjusted, and the judgment process is restarted after an interval time t2, that is, return to Step 1. If not, execute Step 17;

[0097] Step 17: Determine whether there is room for increasing the frequency of the small machine's refrigeration pump, that is, whether fxi < fmax holds. If so, increase the frequency of the small machine's refrigeration pump by 2 Hz. After a time t1, t1 is generally defaulted to 3 minutes, and execute Step 24. If not, execute Step 18;

[0098] Step 18: Determine whether the set value of the small machine's outlet water temperature Tgxi < the system temperature set value Tgx0 - T holds. T is the set temperature difference, generally defaulted to 2 °C. If so, it means that the current working condition cannot be adjusted, and the judgment process is restarted after an interval time t2, t2 is generally defaulted to 5 minutes, that is, return to Step 1. If not, execute Step 19;

[0099] Step 19: Decrease the set value of the small machine's outlet water temperature Tgxi by a temperature ΔT7, where ΔT7 is the set temperature difference value, generally defaulted to 0.5 °C, and execute Step 24 after an interval time t1;

[0100] Step 20: Determine whether the guide vane opening of the small machine Ax>40% is established. If not, it means that the current operating condition cannot be adjusted. The judgment process is re-executed at interval t2. Generally, t2 defaults to 5 minutes, that is, return to step 1; if yes, execute step 21;

[0101] Step 21: Determine whether the frequency fxi of the small machine refrigeration pump has room for frequency reduction, that is, whether fxi>fmin is established? If not, it means that the current working condition cannot be adjusted, and the judgment process is re-executed at interval t2. t2 is generally 5 minutes by default, that is, return to step 1; if yes, execute step 22;

[0102] Step 22: Determine whether the small unit water outlet temperature setting value Tgxi < system temperature setting value Tgx0 + T is established? T is the set temperature difference, which is generally 2°C by default. If so, the small unit refrigeration pump frequency fxi is reduced by 2Hz, and after time t1, t1 is generally 3min by default, and step 24 is executed; if not, step 23 is executed

[0103] Step 23: The outlet water temperature setting value Tgxi of the small unit is increased by 0.5°C, and after time t1, t1 is generally 3 minutes by default, go to step 24;

[0104] Step 24: Calculate the COP of the unit after the operating parameters are changed through the model, and determine whether the average COP of the unit is lower than the COP value at the previous moment. If so, operate according to the operating parameters at the previous moment; if not, execute step 25;

[0105] Step 25: Is the chilled water supply and return temperature difference ΔT8 < the set temperature difference ΔT0-T1? ΔT8 is usually the chilled water return temperature - chilled water supply temperature, ΔT0 is the chilled water supply and return temperature difference, which is generally 5°C by default, and T1 is the temperature difference variable setting value, which is generally 2°C. If yes, the previous operating condition parameters are used for operation; if not, return to step 1.

[0106] This embodiment builds the energy efficiency model of the unit through the full operating parameters or curves of the equipment, and determines the high-efficiency range of the unit based on the evaporating temperature and the condensing temperature; based on the high-efficiency range of the unit, dynamically adjusts the outlet water temperature of the small unit and the frequency of the refrigeration pump to ensure that the large unit always operates in the high-efficiency range, thereby improving the average energy efficiency of the unit; based on the guide vane opening of the unit, dynamically adjusts the outlet water temperature of the small unit and the frequency of the refrigeration pump to ensure that the large unit always operates in the high-efficiency range.

[0107] The solution of this embodiment avoids the problem of low average energy efficiency of the main unit due to the same frequency control of traditional large and small units; avoids the problem that conventional group control strategies cannot determine the high-efficiency range of the unit; avoids accidents such as unstable unit operation and low energy efficiency caused by failure of system sensors or lack of sensors, and cannot timely calculate the system load rate. The unit outlet water temperature and water pump frequency are adjusted based on the unit guide vane opening, effectively improving system stability while ensuring system efficiency; a control method and device for high-efficiency zone adaptation of large and small unit systems are proposed, and the energy efficiency model of the unit can be built through the full-condition performance curve of the unit itself, so as to determine the high-efficiency range of main equipment of different types and different cooling capacities; by controlling the outlet water temperature of the small unit and the frequency of the small unit refrigeration pump, it is ensured that the large unit always runs in the high-efficiency range; by comparing the average COP of the unit, it is always ensured that the unit energy efficiency of the system is the highest, and the energy efficiency of the unit can be improved by more than 5% to 10% compared with conventional control, which greatly improves the energy efficiency level of the system.

[0108] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0109] Example 2

[0110] In this embodiment, an air conditioning system is also provided, and the device is used to implement the above-mentioned embodiment and preferred implementation mode, and the descriptions that have been made are not repeated. As used below, the term "module" can implement a combination of software and hardware of the reservation function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, can also be conceived.

[0111] Figure 5 is a structural block diagram of an air conditioning system according to an embodiment of the present invention, such as Figure 5 As shown, it includes: a first type of unit 50, a second type of unit 52, and a controller 54, the power of the first type of unit is greater than that of the second type of unit, and the controller 54 includes:

[0112] An acquisition module 540 is used to acquire operating parameters of a first type of unit of an air-conditioning system, wherein the air-conditioning system includes the first type of unit and a second type of unit, and the power of the first type of unit is greater than that of the second type of unit;

[0113] A first judgment module 542 is used to judge whether the first type of unit is operating in the optimal energy efficiency range of the load factor based on the operating condition parameters;

[0114] The adjustment module 544 is used to adjust the operating parameters of the second type of unit if the first type of unit is not operating in the optimal energy efficiency range of the load factor, so that the first type of unit operates in the optimal energy efficiency range.

[0115] Optionally, the first judgment module includes: an acquisition unit, used to acquire a unit energy efficiency model of the air-conditioning system, wherein the unit energy efficiency model includes a mapping relationship between the operating parameters and the unit load rate and the maximum energy efficiency of the unit; a monitoring unit, used to monitor the effective unit load rate of the first type of unit; an input unit, used to input the operating parameters and the unit load rate into the unit energy efficiency model if the effective unit load rate of the first type of unit is monitored, so as to obtain the optimal energy efficiency range of the first type of unit; and a judgment unit, used to judge whether the unit load rate is within the optimal energy efficiency range.

[0116] Optionally, the monitoring unit includes: a determination subunit, used to determine the rated cooling capacity and the number of units of the first type of unit; a calculation subunit, used to calculate the unit load rate of the first type of unit using the following formula: unit load rate = system cooling capacity / (rated cooling capacity*number of units).

[0117] Optionally, the acquisition unit includes: a judgment subunit, used to judge whether there is a unit energy efficiency model matching the operating parameters in the preset model library; a processing subunit, used to retrieve the unit energy efficiency model if there is a unit energy efficiency model matching the operating parameters in the preset model library; if there is no unit energy efficiency model matching the operating parameters in the preset model library, constructing the unit energy efficiency model using preset experimental data associated with the operating parameters.

[0118] Optionally, the device further includes: a first detection module, for detecting a first guide vane opening of the first type of unit if the first judgment module does not monitor an effective unit load rate of the first type of unit; a second judgment module, for judging whether the first guide vane opening is greater than a first preset opening; a second detection module, for detecting a second guide vane opening of the second type of unit if the first guide vane opening is greater than the first preset opening; a third judgment module, for judging whether the second guide vane opening is greater than the first preset opening; a fourth judgment module, for judging whether the second guide vane opening is less than or equal to the first preset opening. The first processing module is used to determine whether the freezing pump frequency of the second type of unit is less than the maximum frequency; if the freezing pump frequency of the second type of unit is less than the maximum frequency, increase the freezing pump frequency of the second type of unit according to the first step; if the freezing pump frequency of the second type of unit is equal to the maximum frequency, determine whether the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is greater than the set temperature difference; the second processing module is used to reduce the outlet water temperature setting value of the second type of unit according to the second step if the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is less than or equal to the set temperature difference.

[0119] Optionally, the device further includes: a third detection module, which is used to detect the second guide vane opening of the second type of unit if the first guide vane opening is less than or equal to the first preset opening after the second judgment module determines whether the first guide vane opening is greater than the first preset opening; a fifth judgment module, which is used to determine whether the second guide vane opening is greater than the second preset opening, wherein the second preset opening is less than the first preset opening; a sixth judgment module, which is used to determine whether the refrigeration pump frequency of the second type of unit is greater than the minimum frequency if the second guide vane opening is greater than the second preset opening; a third processing module, which is used to determine whether the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference if the refrigeration pump frequency of the second type of unit is greater than the minimum frequency; a fourth processing module, which is used to reduce the refrigeration pump frequency of the second type of unit according to the third step length if the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference; and to increase the outlet water temperature setting value of the second type of unit according to the fourth step length if the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is greater than or equal to the set temperature difference.

[0120] Optionally, if the unit load rate of the first type of unit is less than the minimum value of the optimal energy efficiency range, the adjustment module includes: a first judgment unit, used to determine whether the refrigeration pump frequency of the second type of unit is greater than the minimum frequency; a first adjustment unit, used to reduce the refrigeration pump frequency of the second type of unit according to the fifth step if the refrigeration pump frequency of the second type of unit is greater than the minimum frequency; if the refrigeration pump frequency of the second type of unit is equal to the minimum frequency, determine whether the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference; a second adjustment unit, used to increase the outlet water temperature setting value of the second type of unit according to the sixth step if the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference.

[0121] Optionally, if the unit load rate of the first type of unit is greater than the maximum value of the optimal energy efficiency range, the adjustment module includes: a second judgment unit, used to judge whether the refrigeration pump frequency of the second type of unit is less than the maximum frequency; a third adjustment unit, used to increase the refrigeration pump frequency of the second type of unit according to the seventh step if the refrigeration pump frequency of the second type of unit is less than the maximum frequency; if the refrigeration pump frequency of the second type of unit is equal to the maximum frequency, judge whether the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is greater than the set temperature difference; a fourth adjustment unit, used to reduce the outlet water temperature setting value of the second type of unit according to the eighth step if the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is less than or equal to the set temperature difference.

[0122] It should be noted that the above modules can be implemented by software or hardware. For the latter, it can be implemented in the following ways, but not limited to: the above modules are all located in the same processor; or the above modules are located in different processors in any combination.

[0123] Example 3

[0124] An embodiment of the present invention further provides a storage medium, in which a computer program is stored, wherein the computer program is configured to execute the steps of any of the above method embodiments when running.

[0125] Optionally, in this embodiment, the above storage medium may be configured to store a computer program for executing:

[0126] S1, obtaining operating parameters of a first type of unit of an air-conditioning system, wherein the air-conditioning system includes the first type of unit and a second type of unit, and the power of the first type of unit is greater than that of the second type of unit;

[0127] S2, judging whether the first type of unit is operating in an optimal energy efficiency range of load factor based on the operating condition parameters;

[0128] S3: If the first type of unit is not operating in the optimal energy efficiency range of the load rate, adjust the operating parameters of the second type of unit to make the first type of unit operate in the optimal energy efficiency range.

[0129] Optionally, in this embodiment, the above-mentioned storage medium may include but is not limited to: a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and other media that can store computer programs.

[0130] An embodiment of the present invention further provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0131] Optionally, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0132] Optionally, in this embodiment, the processor may be configured to perform the following steps through a computer program:

[0133] S1, obtaining operating parameters of a first type of unit of an air-conditioning system, wherein the air-conditioning system includes the first type of unit and a second type of unit, and the power of the first type of unit is greater than that of the second type of unit;

[0134] S2, judging whether the first type of unit is operating in an optimal energy efficiency range of load factor based on the operating condition parameters;

[0135] S3: If the first type of unit is not operating in the optimal energy efficiency range of the load rate, adjust the operating parameters of the second type of unit to make the first type of unit operate in the optimal energy efficiency range.

[0136] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation modes, and this embodiment will not be described in detail here.

[0137] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0138] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0139] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0140] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0141] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0142] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or all or part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a controller or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc. Various media that can store program codes.

[0143] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A control method for an air conditioning system, characterized in that: include: Acquire operating parameters of a first type of unit of an air-conditioning system, wherein the air-conditioning system includes the first type of unit and a second type of unit, and the power of the first type of unit is greater than that of the second type of unit; Determining whether the first type of unit is operating in an optimal energy efficiency range of the load factor based on the operating condition parameters; If the first type of unit is not operating in the optimal energy efficiency range of the load rate, adjust the operating parameters of the second type of unit to make the first type of unit operate in the optimal energy efficiency range.

2. The method according to claim 1, characterized in that Judging whether the first type of unit is operating in the optimal energy efficiency range of the load factor based on the operating condition parameters includes: Acquire a unit energy efficiency model of the air conditioning system, wherein the unit energy efficiency model includes a mapping relationship between the operating condition parameters and the unit load rate and the maximum energy efficiency of the unit; Monitoring the effective unit load factor of the first type of units; If an effective unit load rate of the first type of unit is monitored, the operating condition parameters and the unit load rate are input into the unit energy efficiency model to obtain the optimal energy efficiency range of the first type of unit; Determine whether the unit load factor is within the optimal energy efficiency range.

3. The method according to claim 2, characterized in that Monitoring the effective unit load factor of the first type of units includes: Determining the rated cooling capacity and number of the first type of units; The unit load factor of the first type of unit is calculated using the following formula: Unit load factor = system cooling capacity / (rated cooling capacity*number of units).

4. The method according to claim 2, characterized in that: Obtaining the unit energy efficiency model of the air conditioning system includes: Determine whether there is a unit energy efficiency model matching the operating condition parameters in the preset model library; If there is a unit energy efficiency model matching the operating parameters in the preset model library, the unit energy efficiency model is retrieved; if there is no unit energy efficiency model matching the operating parameters in the preset model library, the unit energy efficiency model is constructed using preset experimental data associated with the operating parameters.

5. The method according to claim 2, characterized in that: If the effective unit load rate of the first type of units is not monitored, the method further includes: detecting the first guide vane opening of the first type of unit; Determining whether the first guide vane opening is greater than a first preset opening; If the first guide vane opening is greater than a first preset opening, detecting a second guide vane opening of the second type of unit; Determining whether the second guide vane opening is greater than the first preset opening; If the second guide vane opening is less than or equal to the first preset opening, determining whether the refrigeration pump frequency of the second type of unit is less than the maximum frequency; If the refrigeration pump frequency of the second type of unit is less than the maximum frequency, the refrigeration pump frequency of the second type of unit is increased according to the first step; if the refrigeration pump frequency of the second type of unit is equal to the maximum frequency, it is determined whether the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is greater than the set temperature difference; If the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is less than or equal to the set temperature difference, the outlet water temperature setting value of the second type of unit is reduced according to the second step.

6. The method according to claim 5, characterized in that After determining whether the first guide vane opening is greater than a first preset opening, the method further includes: If the first guide vane opening is less than or equal to a first preset opening, detecting a second guide vane opening of the second type of unit; Determining whether the second guide vane opening is greater than a second preset opening, wherein the second preset opening is smaller than the first preset opening; If the second guide vane opening is greater than the second preset opening, determining whether the refrigeration pump frequency of the second type of unit is greater than a minimum frequency; If the refrigeration pump frequency of the second type of unit is greater than the minimum frequency, determining whether the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference; If the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference, the refrigeration pump frequency of the second type of unit is reduced according to the third step; if the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is greater than or equal to the set temperature difference, the outlet water temperature setting value of the second type of unit is increased according to the fourth step.

7. The method according to claim 1, characterized in that If the unit load rate of the first type of unit is less than the minimum value of the optimal energy efficiency range, adjusting the operating parameters of the second type of unit includes: determining whether the refrigeration pump frequency of the second type of unit is greater than a minimum frequency; If the refrigeration pump frequency of the second type of unit is greater than the minimum frequency, reduce the refrigeration pump frequency of the second type of unit according to the fifth step; if the refrigeration pump frequency of the second type of unit is equal to the minimum frequency, determine whether the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference; If the difference between the outlet water temperature setting value of the second type of unit and the system temperature setting value is less than the set temperature difference, the outlet water temperature setting value of the second type of unit is increased according to the sixth step.

8. The method according to claim 1, characterized in that If the unit load rate of the first type of unit is greater than the maximum value of the optimal energy efficiency range, adjusting the operating parameters of the second type of unit includes: determining whether the refrigeration pump frequency of the second type of unit is less than the maximum frequency; If the refrigeration pump frequency of the second type of unit is less than the maximum frequency, increase the refrigeration pump frequency of the second type of unit according to the seventh step; if the refrigeration pump frequency of the second type of unit is equal to the maximum frequency, determine whether the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is greater than the set temperature difference; If the difference between the system temperature setting value and the outlet water temperature setting value of the second type of unit is less than or equal to the set temperature difference, the outlet water temperature setting value of the second type of unit is reduced according to the eighth step.

9. An air conditioning system, characterized in that: include: A first type of unit, a second type of unit, and a controller, wherein the power of the first type of unit is greater than that of the second type of unit, and the controller comprises: An acquisition module, used for acquiring operating parameters of a first type of unit of an air-conditioning system, wherein the air-conditioning system comprises the first type of unit and a second type of unit, and the power of the first type of unit is greater than that of the second type of unit; A first judgment module, used for judging whether the first type of unit is operating in an optimal energy efficiency range of a load factor based on the operating condition parameters; The adjustment module is used to adjust the operating parameters of the second type of unit if the first type of unit is not operating in the optimal energy efficiency range of the load rate, so that the first type of unit operates in the optimal energy efficiency range.

10. A storage medium, characterized in that: The storage medium stores a computer program, wherein the computer program is configured to execute the steps of the method for controlling an air-conditioning system in any one of claims 1 to 8 when the computer program is run.

11. An electronic device comprising 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 a communication bus; wherein: Memory, used to store computer programs; A processor, configured to execute the steps of the air conditioning system control method according to any one of claims 1 to 8 by running a program stored in a memory.

Images