CN117628676A

CN117628676A - Method and device for controlling multi-compressor air conditioning unit and air conditioning unit

Info

Publication number: CN117628676A
Application number: CN202211003300.6A
Authority: CN
Inventors: 隋杰磊; 张捷
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Air Conditioning Electric Co Ltd; Haier Smart Home Co Ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2024-03-01

Abstract

The application relates to the technical field of refrigeration, and discloses a method for controlling a multi-compressor air conditioning unit, wherein the air conditioning unit is a water chilling unit and comprises a plurality of compressors of different types, and the maximum refrigerating capacity of each compressor of different types is different, and the method comprises the following steps: under the condition of refrigerating operation of an air conditioning unit, acquiring a first difference value between the current water outlet temperature and the target water outlet temperature of the air conditioning unit and the calibration quantity of the maximum refrigerating capacity of each type of compressor; under the condition that the first difference value is larger than a first threshold value, determining a loaded target compressor according to the first difference value, the standard quantity and a second difference value of the inlet water temperature and the outlet water temperature under the full-load working condition of the air conditioner unit; and controlling the target compressor to start and run. When the method loads the compressor, the target compressor can be accurately and rapidly determined by the standard quantity, so that the running reliability of the air conditioning unit is improved, and the control precision is also improved. The application also discloses a device for controlling the multi-compressor air conditioning unit and the air conditioning unit.

Description

Method and device for controlling multi-compressor air conditioning unit and air conditioning unit

Technical Field

The present application relates to the field of refrigeration technology, for example, to a method and an apparatus for controlling a multi-compressor air conditioning unit, and an air conditioning unit.

Background

At present, when the current actual water temperature of the water chilling unit deviates from the target set water temperature, the water chilling unit controls the compressor to increase or decrease the number of machine heads or increase or decrease the energy so as to enable the actual water temperature of the water chilling unit to reach the set target water temperature.

The related art discloses a load control method of a multi-compressor unit, which is used for acquiring the outlet water temperature of condenser cooling water and the return air temperature of an indoor unit in real time; if the outlet water temperature is in the starting range and the return air temperature is greater than the set target temperature, starting the first compressor; and determining the number of the loading or unloading compressors according to the difference value between the real-time water outlet temperature and the target temperature and the real-time air return temperature.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

for a chiller with multiple compressors, if all the compressors are identical in model number (the maximum refrigeration capacity is the same), any one of the compressors can be selected to increase or decrease the head. However, if the compressor types are different, the water temperature can not reach the target water temperature or far exceeds the target water temperature by randomly increasing or decreasing the machine heads, so that the system load can be severely fluctuated.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a method and a device for controlling a multi-compressor air conditioning unit and the air conditioning unit, so as to meet the requirement of a user on target load and improve the operation reliability of the air conditioning unit.

In some embodiments, the air conditioning unit is a chiller unit including a plurality of types of compressors, each type of compressor having a different maximum cooling capacity, the method comprising: under the condition that the air conditioning unit operates, a first difference value between the current water outlet temperature and the target water outlet temperature of the air conditioning unit and the calibration quantity of the maximum refrigerating capacity of each type of compressor are obtained; under the condition that the first difference value is larger than a first threshold value, determining a loaded target compressor according to the first difference value, the standard quantity and a second difference value between the inlet water temperature and the outlet water temperature of the air conditioner set under the load working condition; and controlling the target compressor to start to run.

In some embodiments, the apparatus comprises: a processor and a memory storing program instructions, the processor being configured to perform the method for controlling a multi-compressor air conditioning unit as described previously, when the program instructions are executed.

In some embodiments, the air conditioning unit includes: compressors of a plurality of models, each model having a different maximum capacity; and, an apparatus for controlling a multi-compressor air conditioning unit as previously described.

The method and the device for controlling the multi-compressor air conditioning unit and the air conditioning unit provided by the embodiment of the disclosure can realize the following technical effects:

in the embodiment of the disclosure, the calibration amount of the maximum refrigerating capacity of compressors of different types is obtained. And judging whether the air conditioning unit needs to be loaded or not through the detected first difference value between the current water outlet temperature and the target water outlet temperature. And under the condition that the air conditioning unit needs to be loaded, determining a loaded target compressor according to the first difference value, the standard quantity and the second difference value of the inlet water temperature and the outlet water temperature of the air conditioning unit under the full-load working condition. Therefore, when the compressor is loaded, the target compressor can be accurately and rapidly determined by the standard quantity, so that the water outlet temperature reaches the target water outlet temperature. Meanwhile, the operation reliability of the air conditioning unit is improved, and the control precision is also improved.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

FIG. 1 is a schematic illustration of a method for controlling a multi-compressor air conditioning unit provided by an embodiment of the present disclosure;

FIG. 2 is a schematic illustration of another method for controlling a multi-compressor air conditioning pack provided by an embodiment of the present disclosure;

FIG. 3 is a schematic illustration of another method for controlling a multi-compressor air conditioning pack provided by an embodiment of the present disclosure;

FIG. 4 is a schematic illustration of a method of determining a target compressor for load shedding in a method provided by an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of an apparatus for controlling a multi-compressor air conditioning unit provided by an embodiment of the present disclosure;

fig. 6 is a schematic diagram of another apparatus for controlling a multi-compressor air conditioning unit provided by an embodiment of the present disclosure.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

The term "corresponding" may refer to an association or binding relationship, and the correspondence between a and B refers to an association or binding relationship between a and B.

In the embodiment of the disclosure, the air conditioning unit is a water chilling unit, and the water chilling unit comprises a refrigerant system, a cooling water system and a chilled water system. During refrigeration, the compressor of the refrigerant system drives the refrigerant to circulate between the condenser and the evaporator. The cooling water in the cooling water system takes the heat generated by the condenser away to the cooling tower, and the chilled water in the chilled water system circulates the cold generated by the evaporator into the room, so that the indoor refrigeration is realized.

And detecting the chilled water outlet temperature of the chilled water system, and loading or unloading the output energy (here, cold) by the air conditioning unit according to the detected outlet temperature and the target outlet temperature. In the case that the air conditioning unit has a plurality of types of compressors, the maximum cooling capacity of each type of compressor is different, the loading or unloading of the energy of the air conditioning unit means to increase or decrease the number of heads of the compressors.

For example, there are three models of a series of compressors, each model A, B, C. The cooling capacity of model A is 150RT, the cooling capacity of model B is 200RT, and the cooling capacity of model C is 450RT. If the maximum total refrigerating capacity of the air conditioning unit is 600RT, three compressor combination schemes are available. Four A-type compressors are adopted in the scheme I. And in the second scheme, three compressors of type B are adopted. And a third scheme adopts a compressor of A type and a compressor of C type. The compressor models of the scheme I and the scheme II are the same model, and the energy control of the air conditioning unit is simple. However, the number of compressor heads is large, and the cost is poor. The third scheme has the best cost, but the compressor type is scattered, and the energy control is difficult. The random increase or decrease of the machine head can cause that the water temperature can not reach the target water temperature or far exceeds the target water temperature, thereby causing severe fluctuation of the system load.

Referring to fig. 1, for solving the problem of difficult energy control of multiple types of compressors, an embodiment of the present disclosure provides a method for controlling a multi-compressor air conditioning unit, including:

s101, under the condition of refrigerating operation of an air conditioning unit, the processor obtains a first difference value between the current water outlet temperature and the target water outlet temperature of the air conditioning unit and the calibration quantity of the maximum refrigerating capacity of each type of compressor.

And S102, under the condition that the first difference value is larger than a first threshold value, the processor determines a loaded target compressor according to the first difference value, the standard quantity and a second difference value between the inlet water temperature and the outlet water temperature of the air conditioner set under the load working condition.

S103, the processor controls the target compressor to start running.

When the air conditioning unit operates in a refrigeration mode, the compressor operates to circulate a refrigerant. The cold generated by the evaporator is circulated into the room through the chilled water to provide cold for users. And a temperature sensor is arranged at the chilled water outlet to acquire the water outlet temperature of the air conditioning unit in real time. Comparing the current water outlet temperature with the target water outlet temperature. Typically, the current outlet water temperature is greater than the target outlet water temperature, indicating a higher indoor temperature. At this time, it may be necessary to perform load control of the compressor head. The current outlet water temperature is smaller than the target outlet water temperature, which indicates that the indoor temperature is lower. At this time, load shedding control of the compressor head may be required.

Here, in order to avoid frequent start-up and shut-down of the compressor, a first difference between the current outlet water temperature and the target outlet water temperature is obtained. When the first difference value is larger than a first threshold value, the current outlet water temperature and the target outlet water temperature are larger in phase difference, and the air conditioning unit is determined to need loading control. And further determining the loaded target compressor based on the first difference value, the second difference value and the calibration amount of the maximum refrigerating capacity of each type of compressor. The second difference value refers to the difference value between the water inlet temperature and the water outlet temperature of the air conditioning unit under the full-load working condition. The magnitude of the second difference depends on the total cooling capacity of the air conditioning unit and the operating frequency of the water pump. The calibration quantity of the maximum refrigerating capacity of each type of compressor is stored on a local server or a cloud server of the air conditioning unit. The use is called from the storage end.

The calibration amount of the maximum refrigerating capacity of each type of compressor is formed by recalibrating the maximum refrigerating capacity of each type of compressor according to a preset rule. As an example, the maximum total cooling capacity of the current air conditioning unit is 800RT, and includes three compressors, namely, an a-type compressor with a cooling capacity of 150RT, a B-type compressor with a cooling capacity of 200RT, and a C-type compressor with a cooling capacity of 450RT. The maximum refrigeration capacity of the three compressors is recalibrated by taking the refrigeration capacity of 100RT as the minimum unit. The maximum refrigeration capacity of the three compressors is 1.5 x 100rt, 2 x 100rt, 4.5 x 100rt, respectively. Thus, the compressor is calibrated so that the air conditioning unit can conveniently determine the target compressor, and then the target compressor is controlled to operate so that the outlet water temperature of the chilled water reaches the target outlet water temperature.

In addition, when the compressor currently operated by the air conditioning unit is in the maximum refrigerating capacity operation, the current outlet water temperature cannot reach the target outlet water temperature, and then the compressor is loaded.

By adopting the method for controlling the multi-compressor air conditioning unit provided by the embodiment of the disclosure, the calibration amount of the maximum refrigerating capacity of the compressors of different types is obtained. And judging whether the air conditioning unit needs to be loaded or not through the detected first difference value between the current water outlet temperature and the target water outlet temperature. And under the condition that the air conditioning unit needs to be loaded, determining a loaded target compressor according to the first difference value, the standard quantity and the second difference value of the inlet water temperature and the outlet water temperature of the air conditioning unit under the full-load working condition. Therefore, when the compressor is loaded, the target compressor can be accurately and rapidly determined by the standard quantity, so that the water outlet temperature reaches the target water outlet temperature. Meanwhile, the operation reliability of the air conditioning unit is improved, and the control precision is also improved.

Optionally, the water pump of the air conditioning unit is a variable frequency water pump, and in step S102, the processor determines a second difference between the inlet water temperature and the outlet water temperature of the air conditioning unit under the load working condition by:

the processor obtains the maximum total refrigerating capacity of the air conditioning unit and the water flow of the water pump under the full-load working condition of the air conditioning unit.

The processor calculates DeltaT ₂ ＝Q _{Total (S)} /(L x a); wherein DeltaT ₂ Is the second difference, Q _{Total (S)} And L is the water flow under the working condition of the air conditioner set under the load condition, and A is a constant.

Here, the water pump of air conditioning unit is the variable frequency water pump, and then air conditioning unit is under different operating modes, and the operating frequency of water pump is different can lead to the chilled water to advance the second difference of water outlet temperature different. Therefore, when the water pump is a variable-frequency water pump, the maximum total refrigerating capacity of the air conditioning unit and the water flow under the full-load working condition need to be obtained. Further, based on the cooling capacity q1=l×Δt ₂ *1.163 to derive a second difference. Wherein 1.163 is a constant A, L is water flow (unit is M3/h), deltaT ₂ Is the second difference. 1 kw=860 kcal, 1000/860=1.163.

Optionally, the water pump of the air conditioning unit is a fixed frequency water pump, and in step S102, the processor determines a second difference between the inlet water temperature and the outlet water temperature under the full load working condition of the air conditioning unit by:

the processor obtains the maximum total refrigerating capacity of the air conditioning unit and the rated flow of the constant-frequency water pump.

And the processor determines a second difference value under the full-load working condition of the current air conditioning unit according to the corresponding relation among the refrigerating capacity, the rated flow and the second difference value.

When the water pump of the air conditioning unit is a fixed-frequency water pump, the rated value of the fixed-frequency water pump is obtainedFlow and maximum total refrigeration capacity of the air conditioning unit (i.e. the air conditioning unit is in full load working condition). And obtaining a corresponding second difference value through table lookup. As an example, the maximum total refrigerating capacity of the air conditioning unit is 800RT, and the fixed-frequency water pump is configured according to the national standard, and the second difference value deltat of the air conditioning unit ₂ Is 5 ℃.

Optionally, in step S101, the processor obtains a calibration amount of a maximum refrigerating capacity of each type of compressor, including:

and the processor is used for calibrating the maximum refrigerating capacity of the compressors of other models by taking the compressor corresponding to the minimum value in the maximum refrigerating capacity of each model as a reference.

The processor obtains the calibration quantity Kn of each type of compressor; wherein kn=qn/Q _{Quasi-alignment} The method comprises the steps of carrying out a first treatment on the surface of the Qn is the maximum refrigerating capacity of the compressor of the nth model, Q _{Quasi-alignment} Is the maximum refrigerating capacity of the reference compressor.

The maximum refrigerating capacity of each type of compressor is compared, and the compressor with the smallest maximum refrigerating capacity value is used as a reference. And calibrating other types of compressors with the maximum refrigerating value of the reference compressor to obtain the standard quantity. As an example, the maximum total cooling capacity of the current air conditioning unit is 800RT, and includes three compressors, namely, an a-type compressor with a cooling capacity of 150RT, a B-type compressor with a cooling capacity of 200RT, and a C-type compressor with a cooling capacity of 450RT. And (3) taking the A-type compressor with the minimum refrigerating capacity as a reference, and calibrating the compressors of the other two types. The refrigerating capacity of the B-type compressor and the refrigerating capacity of the C-type compressor are calibrated according to the refrigerating capacity of the reference A-type compressor multiplied by the correction coefficient. The refrigerating capacity of the B-type compressor is calibrated to be K2-200 RT, and the refrigerating capacity of the C-type compressor is calibrated to be K3-200 RT. The nominal amount k2=1.3, k3=3.

As shown in connection with fig. 2, an embodiment of the present disclosure provides another method for controlling a multi-compressor air conditioning unit, comprising:

S121, under the condition that the first difference value is larger than a first threshold value, the processor determines the target standard quantity of the loaded compressors according to the first difference value, the second difference value of the inlet water temperature and the outlet water temperature under the full-load working condition of the air conditioner and the standard quantity of each type of compressor.

S122, the processor determines a target compressor according to the target standard quantity.

S103, the processor controls the target compressor to start running.

Here, when the compressor is loaded, a target calibration amount for loading the compressor is determined based on the first difference value, the second difference value, and the calibration amounts of the respective types of compressors. Then, the target compressor is determined based on the target amount. For example, the calculation results in a target standard amount of 3. As in the 800RT air conditioner set described above, the model C compressor may be determined as the target compressor. The target compressor refers to a compressor that is not started in the current air conditioning unit. If the C-type compressor is started at this time, the C-type compressor cannot be determined as the target compressor. Thus, the difficulty of compressor control is simplified by a standard amount, so that the control of the multi-model compressor is simplified. In addition, the selection mode of the compressor is more accurate, the requirements of users can be met, and the control accuracy is improved.

Optionally, in step S121, the processor determines a target calibration amount of the loaded compressors according to the first difference, the second difference between the inlet water temperature and the outlet water temperature of the air conditioner under the full load working condition, and the calibration amounts of the compressors of each type, including:

the processor calculates ks= (1+k2+ … +kn) ×Δt ₁ /ΔT ₂ 。

Wherein Ks is the target standard quantity, kn is the standard quantity of the n-th type compressor, and DeltaT ₁ As a first difference, deltaT ₂ Is the second difference.

Here, the second difference is the difference between the inlet water temperature and the outlet water temperature of the chilled water when the air conditioning unit is under the full load (i.e. the maximum total refrigerating capacity) working condition. The ratio of the first difference value to the second difference value is multiplied by the sum of the standard quantities of the compressors of various types to obtain the target standard quantity to be loaded. As an example, the water pump of the air conditioning unit is rated according to national standard configurationThe maximum total refrigerating capacity of the constant-frequency water pump with the rated flow is 800RT. Then the second difference delta T ₂ =5℃. If the current water outlet temperature is detected to be 10 ℃ and the target water outlet temperature is detected to be 7 ℃, a first difference value delta T ₁ =3℃. Further, the target amount ks= (1+1.3+3) ×3/5=3.18. And then selecting the target compressor according to the target standard quantity. For example, a compressor of type C, or a combination of a compressor of type C and a compressor of type A, or a combination of a compressor of type C and a compressor of type B may be selected.

Optionally, in step S122, the processor determines a target compressor according to the target standard amount, including:

the processor compares the target amount with the target amounts for each model of compressor.

The processor selects the compressors corresponding to the target quantity as loaded target compressors according to the sequence from large to small, and the sum of the target quantities of the target compressors is greater than or equal to the target quantity.

Here, after the target standard amount is determined, the target standard amount is compared with the standard amount of each model compressor. And then selecting the target compressors according to the sequence from large to small. As an example, the target table quantity is 3.18, the calibration quantity K1 of the compressor of model a is 1, the calibration quantity K2 of the compressor of model b is 1.3, and the calibration quantity K3 of the compressor of model c is 3. And 3.18 is larger than K3 and larger than K2 and larger than K1, and if the C-type compressor is not started at the moment, the C-type compressor is started preferentially. If the C-type compressor is already running, the B-type compressor is started preferentially. If the B, C compressors are all running, the A compressor is started. Wherein, the air conditioning unit also can start a plurality of compressors simultaneously. If there are multiple compressors not started, the A and C type compressors, or the B and C type compressors, may be started directly. In principle, the sum of the Kn values of the loaded compressors is greater than or equal to the target standard quantity. Therefore, when the air conditioning unit loads the compressor head, the quick adjustment can be realized, the start and stop probability of the compressor is reduced, and the control precision of the unit and the reliability of the compressor are improved. As another example, the target amount is 2.8, K3 > 2.8 > K2 > K1. If the C-type compressor is not started at this time, the C-type compressor is started preferentially. If the C-type compressor is already running, the B-type compressor is started preferentially. If the B, C compressors are all running, the A compressor is started. Likewise, multiple compressors may be started simultaneously.

As shown in connection with fig. 3, an embodiment of the present disclosure provides another method for controlling a multi-compressor air conditioning unit, comprising:

S103, the processor controls the target compressor to start running.

S204, under the condition that the first difference value is smaller than the second threshold value and the current outlet water temperature change rate is larger than the preset change rate, the processor determines the load-shedding target compressor according to the current outlet water temperature change rate and the preset change rate.

S205, the processor controls the target compressor to be shut down.

In an embodiment of the disclosure, load shedding control of the compressor is further included. When the first difference value between the current water outlet temperature and the target water outlet temperature is smaller than the second threshold value, the current water outlet temperature is lower than the target water outlet temperature, and the difference between the current water outlet temperature and the target water outlet temperature is larger. Further, the current outlet water temperature change rate (i.e., water temperature decrease rate) is calculated. And if the current water temperature change rate is greater than the preset change rate, indicating that the air conditioning unit needs to carry out load shedding of the compressor. Wherein, the preset change rate can take the value of 0.04 ℃/s. And then determining the load-shedding target compressor based on the current outlet water temperature change rate and the preset change rate. Specifically, the target amount of load shedding may be determined based on the current outlet water temperature change rate and the preset change rate, as previously described. And then determining the target compressor according to the target standard quantity.

As shown in fig. 4, optionally, in step S204, the processor determines a target compressor for load shedding according to the current outlet water temperature change rate and the preset change rate, including:

s241, the processor calculates the ratio of the current outlet water temperature change rate to the preset change rate; and calculating the absolute value of the difference between each standard quantity and the specific value.

And S242, the processor takes the compressor with the standard quantity corresponding to the minimum difference absolute value as the load shedding target compressor.

Here, the ratio of the current outlet water temperature change rate to the preset change rate is calculated. And then calculating the absolute value of the difference between the standard quantity and the specific value of each type of compressor. And comparing the absolute values of the differences, and selecting the compressor corresponding to the calibration quantity with the minimum absolute value of the difference as the load-shedding target compressor. As an example, the current water output change rate is 0.05 ℃/s, and the preset change rate can take on the value of 0.04 ℃/s. The ratio is 1.25, the absolute value of the difference between the standard quantity of the type a compressor and the ratio is 0.25, the absolute value of the type b compressor is 0.05, and the absolute value of the type c compressor is 1.75. And taking the B model compressor corresponding to the minimum difference absolute value of 0.05 as a load shedding target compressor. Therefore, the air conditioning unit can meet the actual target load of a user more quickly when the energy is adjusted to the load shedding machine head, reach the target set temperature, reduce the start-stop probability of the compressor, and improve the control precision of the unit and the reliability of the compressor.

As shown in conjunction with fig. 5, an embodiment of the present disclosure provides an apparatus for controlling a multi-compressor air conditioning unit, including an acquisition module 51, a determination module 52, and a control module 53. The obtaining module 51 is configured to obtain a first difference between a current outlet water temperature and a target outlet water temperature of the air conditioning unit and a calibration amount of a maximum refrigerating capacity of each type of compressor under the condition of refrigerating operation of the air conditioning unit. The determination module 52 is configured to determine a loaded target compressor based on the first difference, the target amount, and a second difference between the inlet water temperature and the outlet water temperature during the air conditioner set load condition if the first difference is greater than a first threshold. The control module 53 is configured to control a target compressor start-up operation.

By adopting the device for controlling the multi-compressor air conditioning unit provided by the embodiment of the disclosure, the calibration quantity of the maximum refrigerating capacity of compressors of different types can be obtained. And judging whether the air conditioning unit needs to be loaded or not through the detected first difference value between the current water outlet temperature and the target water outlet temperature. And under the condition that the air conditioning unit needs to be loaded, determining a loaded target compressor according to the first difference value, the standard quantity and the second difference value of the inlet water temperature and the outlet water temperature of the air conditioning unit under the full-load working condition. Therefore, when the compressor is loaded, the target compressor can be accurately and rapidly determined by the standard quantity, so that the water outlet temperature reaches the target water outlet temperature. Meanwhile, the operation reliability of the air conditioning unit is improved, and the control precision is also improved.

As shown in connection with fig. 6, an embodiment of the present disclosure provides an apparatus for controlling a multi-compressor air conditioning unit, including a processor (processor) 100 and a memory (memory) 101. Optionally, the apparatus may further comprise a communication interface (Communication Interface) 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via the bus 103. The communication interface 102 may be used for information transfer. The processor 100 may invoke logic instructions in the memory 101 to perform the method for controlling a multi-compressor air conditioning pack of the above-described embodiments.

Further, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and may be stored in a computer readable storage medium when sold or used as a stand alone product.

The memory 101 is a computer readable storage medium that can be used to store a software program, a computer executable program, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing by running program instructions/modules stored in the memory 101, i.e., implements the method for controlling a multi-compressor air conditioning unit in the above-described embodiments.

The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the terminal device, etc. Further, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.

The embodiment of the disclosure provides an air conditioning unit, which comprises the device for controlling the multi-compressor air conditioning unit.

Embodiments of the present disclosure provide a storage medium storing computer-executable instructions configured to perform the above-described method for controlling a multi-compressor air conditioning unit.

The storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.

Embodiments of the present disclosure may be embodied in a software product stored on a storage medium, including one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of a method according to embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium including: a plurality of media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or a transitory storage medium.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may involve structural, logical, electrical, process, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. Moreover, the terminology used in the present application is for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in this application, the terms "comprises," "comprising," and/or "includes," and variations thereof, mean that the stated features, integers, steps, operations, elements, and/or components are present, but that the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements. In this context, each embodiment may be described with emphasis on the differences from the other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.

Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to implement the present embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than that disclosed in the description, and sometimes no specific order exists between different operations or steps. For example, two consecutive operations or steps may actually be performed substantially in parallel, they may sometimes be performed in reverse order, which may be dependent on the functions involved. Each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims

1. A method for controlling a multi-compressor air conditioning unit, wherein the air conditioning unit is a chiller unit comprising a plurality of model compressors, each model compressor having a different maximum capacity, the method comprising:

under the condition of refrigerating operation of an air conditioning unit, acquiring a first difference value between the current water outlet temperature and the target water outlet temperature of the air conditioning unit and the calibration quantity of the maximum refrigerating capacity of each type of compressor;

under the condition that the first difference value is larger than a first threshold value, determining a loaded target compressor according to the first difference value, the standard quantity and a second difference value between the inlet water temperature and the outlet water temperature of the air conditioner set under the load working condition;

and controlling the target compressor to start to run.

2. The method of claim 1, wherein the water pump of the air conditioning unit is a variable frequency water pump; the second difference value between the water inlet temperature and the water outlet temperature of the air conditioner set under the full-load working condition is determined by the following modes:

obtaining the maximum total refrigerating capacity of the air conditioning unit and the water flow of a water pump under the full-load working condition of the air conditioning unit;

calculation of DeltaT ₂ ＝Q _{Total (S)} /(L*A)；

Wherein DeltaT ₂ Is the second difference, Q _{Total (S)} And L is the water flow of the water pump under the working condition of the air conditioner set under the load condition, and A is a constant.

3. The method of claim 1, wherein said obtaining a calibration of a maximum refrigeration capacity of each model of compressor comprises:

calibrating the maximum refrigerating capacity of the compressors of other models by taking the compressor corresponding to the minimum value in the maximum refrigerating capacity of each model as a reference; and is combined with the other components of the water treatment device,

obtaining the calibration quantity Kn of each type of compressor;

wherein kn=qn/Q _{Quasi-alignment} The method comprises the steps of carrying out a first treatment on the surface of the Qn is the maximum refrigerating capacity of the compressor of the nth model, Q _{Quasi-alignment} Is the maximum refrigerating capacity of the reference compressor.

4. The method of claim 3, wherein said determining a loaded target compressor based on said first difference, said target amount, and a second difference between a temperature of incoming water and a temperature of outgoing water during a unit load condition of the air conditioner, comprises:

determining target calibration amounts of the loaded compressors according to the first difference value, the second difference value and the calibration amounts of the compressors of various types;

and determining the loaded target compressor according to the target standard quantity.

5. The method of claim 4, wherein determining a target calibration amount for the loaded compressor based on the first difference, the second difference, and the calibration amounts for each type of compressor comprises:

calculate ks= (1+k2+ … +kn) ×Δt ₁ /ΔT ₂ ；

6. The method of claim 4, wherein said determining a loaded target compressor based on said target amount comprises:

comparing the target standard quantity with the standard quantity of each model of compressor;

and selecting compressors corresponding to the target quantity as loaded target compressors according to the sequence from large to small, wherein the sum of the target quantities of the target compressors is greater than or equal to the target quantity.

7. The method according to any one of claims 1 to 6, further comprising:

under the condition that the first difference value is smaller than a second threshold value and the current outlet water temperature change rate is larger than a preset change rate, determining a load-shedding target compressor according to the current outlet water temperature change rate and the preset change rate;

and controlling the target compressor to be shut down.

8. The method of claim 7, wherein determining the de-rated target compressor based on the current outlet water temperature rate of change and the preset rate of change comprises:

calculating the ratio of the current outlet water temperature change rate to the preset change rate; calculating the absolute value of the difference between each standard quantity and the specific value;

and taking the compressor with the standard quantity corresponding to the minimum difference absolute value as a load-shedding target compressor.

9. An apparatus for controlling a multi-compressor air conditioning unit comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the method for controlling a multi-compressor air conditioning unit according to any one of claims 1 to 8 when the program instructions are run.

10. An air conditioning unit, comprising:

compressors of a plurality of models, each model having a different maximum capacity; and, a step of, in the first embodiment,

the apparatus for controlling a multi-compressor air conditioning unit of claim 9.