CN113959128A - Control method and device for multi-handpiece water chilling unit, refrigeration equipment and medium - Google Patents
Control method and device for multi-handpiece water chilling unit, refrigeration equipment and medium Download PDFInfo
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- CN113959128A CN113959128A CN202111115940.1A CN202111115940A CN113959128A CN 113959128 A CN113959128 A CN 113959128A CN 202111115940 A CN202111115940 A CN 202111115940A CN 113959128 A CN113959128 A CN 113959128A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The application relates to the technical field of refrigeration equipment, and discloses a control method for a multi-handpiece water chilling unit, which comprises the following steps: determining a compressor in a running state as a first target compressor; acquiring operation information of the first target compressor and temperature information of the chilled water; and executing the operation of increasing or decreasing the machine head according to the operation information and the temperature information. The method can improve the accuracy of determining the machine head increasing and decreasing time and realize the stable control of the chilled water temperature. The application also discloses a control device, refrigeration equipment and a medium for the multi-handpiece water chilling unit.
Description
Technical Field
The application relates to the technical field of refrigeration equipment, in particular to a control method and device for a multi-head water chilling unit, refrigeration equipment and a medium.
Background
At present, a centrifugal unit is divided into a single machine head and a double machine head according to the number of the machine heads. Because the centrifugal unit belongs to commercial refrigerating unit, commercial refrigerating unit has different demands to the refrigeration capacity, so, centrifugal unit need satisfy the commercial environment of different cold volume demands. For a single-head centrifugal unit, because the unloading capacity of the single-head centrifugal unit is limited, in order to realize high refrigerating capacity, the situation of frequent start and stop exists when the load demand of the single-head centrifugal unit is low, which can affect the stability of the water temperature control of the chilled water. Therefore, the centrifugal unit is arranged in a structure form of a plurality of multi-head compressors with small refrigerating capacity, and the number of the heads of the centrifugal unit is increased or decreased according to the actual refrigerating condition due to the fact that the multi-head compressors are arranged in the centrifugal unit.
The existing mode of increasing and decreasing the machine head is to collect the outlet water temperature of refrigerant water, when the outlet water problem of the refrigerant water is stable, the ratio of the required refrigerating capacity to the unit design refrigerating capacity is calculated to obtain a refrigerating capacity demand coefficient, the quantity of the compressors to be put into the unit is determined according to the refrigerating capacity demand coefficient, the compressors to be put into the unit are controlled according to a water temperature regulation mode, and whether the refrigerating capacity demand coefficient needs to be recalculated or not and the quantity of the compressors to be put into the unit is determined according to the current outlet water temperature of the refrigerant and the opening condition of the current compressor.
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:
the current refrigerant outlet water temperature changes in real time, the running condition of the compressor in an opening state also changes in real time, and whether the machine head needs to be increased or decreased cannot be accurately determined according to the current refrigerant outlet water temperature and the current opening condition of the compressor, so that the temperature control of the chilled water is unstable.
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 nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a control method and device for a multi-machine-head water chilling unit, refrigeration equipment and a medium, so as to improve the accuracy of machine head increase and decrease opportunity determination and realize stable control of chilled water temperature.
In some embodiments, the method comprises: determining a compressor in a running state as a first target compressor; acquiring operation information of the first target compressor and temperature information of the chilled water; and executing the operation of increasing or decreasing the machine head according to the operation information and the temperature information.
In some embodiments, the apparatus includes a processor and a memory storing program instructions, the processor being configured to execute the control method for a multi-headed chiller when executing the program instructions.
In some embodiments, the refrigeration equipment comprises a control device for a multi-head water chilling unit as described above.
In some embodiments, the storage medium stores program instructions that, when executed, perform a control method for a multi-headed chiller as previously described.
The control method, the control device, the refrigeration equipment and the medium for the multi-head water chilling unit provided by the embodiment of the disclosure can realize the following technical effects:
the operation information of the first target compressor can reflect the operation condition of the compressor, and the method can realize the control of increasing and decreasing the machine head by cooperating with multi-directional factors according to the temperature condition of the chilled water and the operation condition of the compressor in the operation state, thereby improving the accuracy of the timing of increasing and decreasing the machine head and realizing the stable control of the temperature of the chilled water.
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 in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
FIG. 1 is a system schematic of a multi-head refrigeration system;
FIG. 2 is another system schematic of a multi-head refrigeration system;
FIG. 3 is a schematic diagram of a control method for a multi-head chiller according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of another control method for a multi-head chiller according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of another control method for a multi-head chiller according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of another control method for a multi-head chiller according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of another control method for a multiple-head chiller according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of another control method for a multiple-head chiller according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram of another control method for a multi-head chiller according to an embodiment of the present disclosure;
FIG. 10 is a schematic diagram of another control method for a multiple-head chiller according to an embodiment of the present disclosure;
fig. 11 is a schematic diagram of another control method for a multi-head chiller according to an embodiment of the present disclosure;
fig. 12 is a schematic diagram of another control method for a multi-head chiller according to an embodiment of the present disclosure;
fig. 13 is a schematic diagram of a control device for a multi-head chiller according to an embodiment of the present disclosure.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. 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 be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The term "plurality" means two or more unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
The term "correspond" may refer to an association or binding relationship, and a corresponds to B refers to an association or binding relationship between a and B.
One system schematic of a multi-head refrigeration system is shown in fig. 1, the multi-head refrigeration system includes a first evaporator 101a, a second evaporator 101b, a third evaporator 101c, a first compressor 201a, a second compressor 201b, a third compressor 201c, a first condenser 301a, a second condenser 301b, a second condenser 301c, and a first control assembly. The first evaporator 101a is disposed in communication with the first compressor 201a and the first condenser 301a to form a circulating refrigeration circuit. The second evaporator 101b is provided in communication with the second compressor 201b and the second condenser 301b to form a circulating refrigeration circuit. The third evaporator 101c is provided in communication with the third compressor 201c and the third condenser 301c to form a circulating refrigeration circuit. A first bypass line provided with a first bypass valve 401a and a first auxiliary liquid line provided with a first electronic expansion valve 501a are provided between the first evaporator 101a and the first condenser 301 a. A second bypass line provided with a second bypass valve 401b and a second auxiliary liquid path provided with a second electronic expansion valve 501b are provided between the second evaporator 101b and the second condenser 301 b. A third bypass line provided with a third bypass valve 401c and a third auxiliary liquid line provided with a third electronic expansion valve 501c are provided between the third evaporator 101c and the third condenser 301 c. The three circulation refrigeration loops operate independently and share a cooling water system. The aforementioned first control assembly executes a control method for a multiple head chiller as described below. Taking the circulation refrigeration circuit corresponding to the first compressor 201a as an example, the first bypass valve 401a is closed after the start-up of the first compressor 201a is completed and is opened when the first compressor 201a is stopped. The number of the compressors may be three or more.
One system schematic of a multi-head refrigeration system is shown in fig. 2, the multi-head refrigeration system including a fourth evaporator 600, a fourth condenser 700, a fourth compressor 801a, a fifth compressor 801b, a sixth compressor 801c, and a second control assembly. A fourth bypass line and a fourth auxiliary liquid line are disposed between the fourth evaporator 600 and the fourth condenser 700, the fourth bypass line is provided with a fourth bypass valve 1200, and the fourth auxiliary liquid line is provided with a fourth electronic expansion valve 1100. A first cut-in valve 901a is provided between the fourth compressor 801a and the fourth evaporator 600. A second cut-in valve 901b is provided between the fifth compressor 801b and the fourth evaporator 600. A third cut-in valve 901c is provided between the sixth compressor 801c and the fourth evaporator 600. The fourth compressor 801a, the fifth compressor 801b, and the sixth compressor 801c constitute a refrigeration cycle together with the fourth evaporator 600 and the fourth condenser 700. Wherein the plurality of compressors share a cooling water system. The aforementioned second control assembly of the multiple compressors implements a control method for the multiple head chiller as described below. Each cut-in valve (901a, 901b, 901c) is opened when the compressor (801a, 801b, 801c) corresponding to each cut-in valve is started, is closed after the start of the compressor (801a, 801b, 801c) corresponding to each cut-in valve is completed, and is opened when the compressor (801a, 801b, 801c) corresponding to each cut-in valve is stopped. The number of the compressors may be three or more.
Referring to fig. 3, an embodiment of the present disclosure provides a control method for a multi-head water chilling unit, including:
and S01, the multi-head water chilling unit determines that the compressor in the running state is the first target compressor.
And S02, the multi-head water chilling unit acquires the operation information of the first target compressor and the temperature information of the chilled water.
And S03, the multi-handpiece water chilling unit executes the operation of increasing and decreasing the handpiece according to the operation information and the temperature information.
By adopting the control method for the multi-machine-head water chilling unit, provided by the embodiment of the disclosure, the operation information of the first target compressor can reflect the operation condition of the compressor, and the method can realize machine head increase and decrease control by cooperating with multi-azimuth factors according to the temperature condition of chilled water and the operation condition of the compressor in an operation state, so that the accuracy of machine head increase and decrease timing determination is improved, and the stable control of the chilled water temperature is realized.
It will be appreciated that in the case of a multi-head refrigeration system as shown in fig. 1, the operation of increasing or decreasing the heads is performed to turn on/off one or more of the refrigeration cycle circuits in a shutdown state. In the case of a multi-head refrigeration system as shown in fig. 2, the operation of increasing or decreasing the heads is performed to turn on/off one or more compressors in a shutdown state.
Optionally, the temperature information of the chilled water includes a temperature change rate of a first current temperature value within a first preset time period. Referring to fig. 4, the operation of increasing or decreasing the handpiece is performed according to the operation information and the temperature information, and includes:
and S11, under the condition that the operation information shows that the first target compressor is in the first preset load, the multi-handpiece water chiller acquires the temperature change rate of the first current temperature value in the first preset time period.
And S12, when the temperature change rate of the multi-handpiece water chilling unit is smaller than the first preset change rate, the multi-handpiece water chilling unit executes the operation of newly adding the handpiece.
Therefore, when the first target compressor is at the first preset load, the first target compressor is indicated to reach the highest load, and at the moment, the multi-machine-head water chilling unit obtains the temperature change rate of the first current temperature value within the first preset time period. When the temperature change rate is smaller than a first preset change rate, it indicates that the first target compressor which has reached the highest load cannot rapidly reduce the first current temperature value of the chilled water, and the temperature of the chilled water cannot be stably controlled, so that the multi-handpiece water chilling unit executes the operation of newly adding the handpiece to realize the stable control of the chilled water temperature.
Optionally, as shown in fig. 5, the operation of increasing or decreasing the handpiece is performed according to the operation information and the temperature information, and includes:
and S21, acquiring a first current temperature value of the chilled water by the multi-machine-head water chilling unit under the condition that the operation information indicates that the first target compressor is at a first preset load.
And S22, acquiring the temperature change rate of the first current temperature value in the first preset time period by the multi-handpiece water chilling unit under the condition that the first current temperature value is greater than or equal to the first preset temperature value.
And S22, when the temperature change rate of the multi-handpiece water chilling unit is smaller than the first preset change rate, the multi-handpiece water chilling unit executes the operation of newly adding the handpiece.
Therefore, after the first target compressor is determined to reach the highest load, the first current temperature value is compared with the first preset temperature value, if the first current temperature value is larger than or equal to the first preset temperature value, the first target compressor is indicated not to achieve effective control of the temperature of the refrigerating water, and at the moment, the change condition of the first current temperature value is determined by obtaining the temperature change rate of the first current temperature value, so that the operation of the newly added machine head is achieved according to the change condition.
Optionally, as shown in fig. 6, the operation of adding a new handpiece is performed, including:
and S31, the multi-head water chilling unit determines that the compressor in the stop state is the third target compressor.
And S32, the multi-head water chilling unit judges whether the shutdown time interval of the third target compressor is greater than or equal to the preset time interval, if so, the step S33 is executed.
And S33, the multi-head water chilling unit controls the third target compressor to be switched from a shutdown state to an operation state.
Therefore, due to the fact that the compressor is in operation failure caused by frequent starting and stopping of the compressor, a preset time interval can be set, the stopping time interval of the third target compressor is compared with the preset time interval, and when the stopping time interval is equal to or larger than the preset time interval, the operation of the newly added machine head is executed, and stable operation of the third target compressor is achieved.
Optionally, the operation information of the first target compressor includes a rotation speed and a guide vane opening degree. Determining that the first target compressor is at the first preset load as follows:
the rotating speed of the first target compressor is matched with the highest rotating speed; and/or the guide vane opening degree of the first target compressor is matched with the maximum opening degree.
In this way, when the rotation speed of the first target compressor matches the maximum rotation speed and the guide vane opening degree of the first target compressor matches the maximum opening degree, it is indicated that the first target compressor has reached the maximum load.
The rotation speed of the first target compressor is matched with the highest rotation speed, and the rotation speed of the first target compressor can be within a preset range corresponding to the highest rotation speed. The guide vane opening degree of the first target compressor is matched with the maximum opening degree, and the guide vane opening degree of the first target compressor can be within a preset range corresponding to the maximum opening degree.
It should be noted that the maximum rotation speed may be determined by the pneumatic design motor model of the compressor, or may be determined according to the maximum rotation speed corresponding to the operation condition. As an example, the maximum rotation speed is equal to the product of the surge speed and a first preset coefficient. The first predetermined factor is greater than 1. The embodiments of the present disclosure may not be particularly limited thereto.
Referring to fig. 7, the operation of increasing or decreasing the handpiece is performed according to the operation information and the temperature information, and includes:
and S41, under the condition that the operation information shows that the first target compressor is in the first preset load, the multi-handpiece water chiller acquires the temperature change rate of the first current temperature value in the first preset time period.
And S42, under the condition that the temperature change rate of the multi-handpiece water chiller is smaller than a first preset change rate, the multi-handpiece water chiller acquires a first current temperature value of the chilled water.
And S43, determining a water temperature coefficient by the multi-handpiece water chilling unit according to the first current temperature value and the preset temperature value.
And S44, the multi-handpiece water chilling unit multiplies the water temperature coefficient by the total number of all the compressors to determine the number of the newly added handpiece.
The total number of all the compressors is the sum of the number of the compressors configured in the multi-head water chilling unit.
Therefore, the water temperature coefficient is determined by the multi-machine-head water chilling unit according to the first current temperature value and the preset temperature value, the larger the difference value between the first current temperature value and the preset temperature value is, the larger the water temperature coefficient is correspondingly, therefore, the larger the number of the newly added machine heads is determined, and therefore the real-time control on the number of the machine heads can be performed according to the difference condition between the real-time temperature value of chilled water and the preset temperature value.
In practical application, the number of newly added heads is determined according to the following modes:
the number of newly added machine heads is equal to the total number of all compressors multiplied by K x [ the first current temperature value-the preset temperature value ];
wherein [ ] represents a downward integer, K represents a second preset coefficient, and K is more than or equal to 0.01 and less than or equal to 0.3.
As shown in fig. 8, the operation of adding a new handpiece is performed, including:
and S51, the multi-head water chilling unit determines that the compressor in the stop state is the third target compressor.
And S52, the multi-head water chilling unit acquires the running time of the third target compressor.
And S53, the multi-head water chilling unit switches the third target compressor with the minimum running time to the running state.
Therefore, the running time represents the accumulated time of the compressor in the historical running stage, the smaller the accumulated time is, the higher the running stability of the corresponding compressor is, and therefore, the multi-handpiece water chiller selects the third target compressor with the minimum running time to switch to the running state, so that the multi-handpiece water chiller operated by the newly added handpiece can realize stable control of water temperature.
As shown in fig. 9, the operation of adding a new handpiece is performed, including:
and S61, the multi-head water chilling unit determines that the compressor in the stop state is the third target compressor.
And S62, the multi-head water chilling unit acquires the running time of the third target compressor.
And S63, the multi-head water chilling unit switches the third target compressor with the minimum running time to the running state.
And S64, the multi-head water chilling unit determines the first target compressor with the maximum target rotating speed as a fourth target compressor and determines the first target compressor with the minimum target rotating speed as a fifth target compressor.
And S65, determining a rotation speed coefficient by the multi-handpiece water chiller according to the target rotation speed of the fourth target compressor and the target rotation speed of the fifth target compressor.
And S66, the multi-head water chilling unit multiplies the current rotation speed variation by the rotation speed coefficient to determine the variation of the target rotation speed of the fifth target compressor.
And S67, the multi-head water chilling unit multiplies the current rotation speed variation by the reciprocal of the rotation speed coefficient to determine the variation of the target rotation speed of the fourth target compressor.
Wherein, the variation of the current rotation speed is determined by the temperature information of the chilled water.
Therefore, the actual rotating speeds of the first target compressors are not completely the same, and when a new machine head is added, the actual rotating speeds of the first target compressors need to be adjusted, so that the speeds of the first target compressors in the running state are close to each other as much as possible, and the situation that the actual rotating speeds of the first target compressors have large differences is avoided. Therefore, the multi-head water chilling unit determines that the first target compressor with the maximum target rotating speed and the first target compressor with the minimum target rotating speed are the fourth target compressor and the fifth target compressor respectively, and determines the rotating speed coefficient according to the target rotating speeds of the fourth target compressor and the fifth target compressor respectively. The target rotation speed of the fifth target compressor is minimum, the target rotation speed thereof needs to be increased rapidly, the target rotation speed of the fourth target compressor needs to be increased slightly, and therefore, the variation of the target rotation speed of the fifth target compressor is determined by multiplying the variation of the current rotation speed by the rotation speed coefficient, and the variation of the target rotation speed of the fourth target compressor is determined by multiplying the variation of the current rotation speed by the reciprocal of the rotation speed coefficient. The method can realize the linear proportional adjustment of the rotating speeds of the first target compressors with the maximum and minimum actual rotating speeds, so that the new target rotating speeds of the adjusted first target compressors are gradually close to each other, and the stable operation of the multi-handpiece water chiller is realized.
The multi-head water chilling unit determines the rotation speed coefficient according to the target rotation speed of the fourth target compressor and the target rotation speed of the fifth target compressor, and the rotation speed coefficient may be determined by taking the target rotation speed of the fourth target compressor and the target rotation speed of the fifth target compressor as a ratio.
Further, the foregoing amount of change in the target rotation speed refers to an increase in rotation speed.
It should be noted that, after the multi-head water chilling unit switches the third target compressor with the minimum operation time to the operation state, the initial target rotation speed of the third target compressor and/or the initial guide vane opening of the third target compressor may be set. As an example, when the number of the first target compressors is one, the initial target rotation speed may be a surge speed of the first target compressor. As another example, when the number of the first target compressors is two or more, the initial target rotation speed may be a maximum value of the surge speeds of the two or more first target compressors. The initial opening degree of the guide vane may be a preset opening degree or a maximum opening degree. The embodiments of the present disclosure may not be particularly limited thereto.
Optionally, the operation of increasing or decreasing the handpiece is performed according to the operation information and the temperature information, and includes:
and in the case that the operation information indicates that the first target compressor is operated by the preventive control strategy, performing the operation of increasing or decreasing the handpiece according to the temperature information.
The prevention control strategy refers to a protection strategy for limiting load increase preset by the multi-head water chilling unit, namely determining the load increase amount according to the operation information of the compressor, and performing early warning or stopping when the increment of the rotating speed of the compressor is higher than the load increase amount. As an example, the preventive control strategy is to acquire current operation information of the compressor; acquiring target unloading information of the compressor according to the current operation information; and adjusting the current rotating speed of the compressor according to the target unloading information. The operation information may be parameters such as a current value, a suction pressure value, a discharge pressure value, a frequency converter temperature value, and a pressure ratio of the compressor.
As shown in fig. 10, an embodiment of the present disclosure further provides a control method for a multi-head water chilling unit, including:
and S71, the multi-head water chilling unit determines that the compressor in the running state is the first target compressor.
And S72, the multi-head water chilling unit acquires the operation information of the first target compressor and the temperature information of the chilled water.
And S73, under the condition that the operation information shows that the first target compressor is at the second preset load, the multi-machine-head water chilling unit obtains a second current temperature value of the chilled water and the temperature change rate of the second current temperature value within a second preset time period.
And S74, executing the operation of reducing the machine head by the multi-machine-head water chilling unit under the condition that the temperature change rate is greater than zero and the second current temperature value is continuously less than the second preset temperature value in the second preset time period.
By adopting the control method for the multi-handpiece water chiller provided by the embodiment of the disclosure, after the first target compressor is determined to run at the lowest load, the second current temperature value is compared with the second preset temperature value, if the second current temperature value is continuously smaller than the second preset temperature value and the temperature change rate is larger than zero, the first target compressor is indicated to be effectively controlled enough to realize the temperature of the chilled water, and at the moment, in order to improve the running efficiency of the multi-handpiece water chiller, the operation of reducing the handpiece can be realized according to the change condition.
Wherein the second predetermined temperature value is determined by the following formula:
wherein the preset shutdown temperature difference value is a shutdown temperature value, K, preset by the multi-machine-head water chilling unit0Represents a weight coefficient, 1<K0<3。
It can be understood that, under the condition that the temperature change rate is greater than zero and the second current temperature value is continuously less than the second preset temperature value within the second preset time period, after the multi-handpiece water chiller executes the operation of reducing the handpiece, and after the multi-handpiece water chiller delays for the fourth preset time period after reducing the handpiece, the operation information of the first target compressor and the temperature information of the chilled water are obtained again, and according to the new operation information and the new temperature information obtained again, whether the subsequent handpiece operation needs to be increased or decreased is judged.
Optionally, the operation information of the first target compressor includes a rotation speed and a guide vane opening degree, and it is determined that the first target compressor is at the second preset load according to the following manner:
the rotating speed of the first target compressor is matched with the lowest rotating speed; and/or the guide vane opening degree of the first target compressor is matched with the minimum opening degree.
In this way, when the rotation speed of the first target compressor is matched with the minimum rotation speed and the guide vane opening degree of the first target compressor is matched with the minimum opening degree, it is indicated that the first target compressor has been operated to the minimum load.
The rotation speed of the first target compressor is matched with the lowest rotation speed, and the rotation speed of the first target compressor can be within a preset range corresponding to the lowest rotation speed. The guide vane opening degree of the first target compressor is matched with the minimum opening degree, and the guide vane opening degree of the first target compressor can be within a preset range corresponding to the minimum opening degree.
It should be noted that the minimum rotation speed refers to the minimum rotation speed corresponding to the compressor operating under the current working condition of the compressor, and if the compressor operates at a rotation speed value lower than the minimum rotation speed, the risk of surge may occur.
Alternatively, as shown in fig. 11, when the number of the first target compressors is greater than or equal to the preset number, the operation of reducing the number of the heads is performed, and includes:
and S81, the multi-head water chilling unit acquires the running time of the first target compressor.
And S82, the multi-head water chilling unit determines the first target compressor with the largest operation time as the second target compressor.
And S83, controlling the second target compressor to execute the shutdown operation by the multi-head water chilling unit.
Therefore, the running time represents the accumulated time of the compressor in the historical running stage, and the running stability of the corresponding compressor is lower when the accumulated time is longer, so that the multi-handpiece water chilling unit selects the second target compressor with the largest running time to be switched to the running state, and the multi-handpiece water chilling unit with reduced handpiece operation can realize stable control of water temperature and improve the running efficiency of the multi-handpiece water chilling unit.
With reference to fig. 12, an embodiment of the present disclosure further provides a control method for a multi-head water chilling unit, including:
and S91, the multi-head water chilling unit determines that the compressor in the running state is the first target compressor.
And S92, the multi-head water chilling unit acquires the operation information of the first target compressor and the temperature information of the chilled water.
And S93, under the condition that the operation information shows that the first target compressor is at the second preset load, the multi-machine-head water chilling unit obtains a second current temperature value of the chilled water and the temperature change rate of the second current temperature value within a second preset time period.
And S94, executing the operation of reducing the machine head by the multi-machine-head water chilling unit under the condition that the temperature change rate is greater than zero and the second current temperature value is continuously less than the second preset temperature value in the second preset time period.
And S95, when the second current temperature value is in a descending state and the second current temperature value is continuously less than or equal to the preset shutdown temperature difference value within a third preset time period, the multi-handpiece water chilling unit executes the operation of stopping all the handpieces.
By adopting the control method for the multi-handpiece water chilling unit provided by the embodiment of the disclosure, when the second current temperature value is in a descending state and the second current temperature value is continuously less than or equal to the preset shutdown temperature difference value in the third preset time period, it is indicated that the multi-handpiece water chilling unit is in a fault during operation, shutdown processing is urgently needed, and at this time, the multi-handpiece water chilling unit executes the operation of stopping all the handpieces from operating.
And the second preset temperature value is greater than the preset shutdown temperature difference value.
It should be noted that the multi-head water chiller group synchronously monitors the change rate of the second current temperature value and the second current temperature value, and executes an operation of stopping the operation of all the heads when the second current temperature value is in a descending state and the second current temperature value in a third preset time period is less than or equal to a preset shutdown temperature difference value.
Optionally, it is determined that the second current temperature value is in the falling state according to the following manner:
and the change rate of the second current temperature value in the second preset time period is smaller than a second preset change rate. Wherein the second predetermined rate of change is less than zero.
In practical application, the specific steps of adding the handpiece are described as follows:
the control method for the multi-head water chilling unit is based on the multi-head refrigeration system shown in figure 1, and the control method comprises the following execution steps:
first, the multi-head chiller acquires the operating state of each compressor, determines that the first compressor 201a and the second compressor 201b are in the operating state and the third compressor 201c is in the shutdown state, and determines that the first compressor 201a and the second compressor 201b are the first target compressor.
Secondly, the multi-head water chilling unit obtains that the rotating speeds of the first compressor 201a and the second compressor 201b are the highest rotating speeds and the guide vane opening degrees of the first compressor 201a and the second compressor 201b are the maximum opening degrees, so that it is determined that the first target compressor is in the first preset load.
Then, the multi-head water chilling unit obtains the temperature change rate D1 of the first current temperature value within the first preset time period T1, and it is confirmed that the temperature change rate D1 is smaller than the first preset change rate, so that the multi-head water chilling unit performs the operation of newly adding the head, specifically, the multi-head water chilling unit determines that the third compressor 201c is in a stop state, and determines that the third compressor 201c is the third target compressor.
Thirdly, the multi-head water chilling unit determines that the shutdown time interval of the third compressor 201c is greater than the preset time interval, so that the multi-head water chilling unit controls the third compressor 201c to be switched from the shutdown state to the running state, and determines that the initial guide vane opening of the third compressor 201c is the maximum opening.
Then, the multi-headed chiller acquires the surge speeds of the first compressor 201a and the second compressor 201b, and it is confirmed that the surge speed of the first compressor 201b is higher than that of the second compressor 201b, and thus the surge speed of the second compressor 201b is determined as the initial target rotation speed of the second compressor 201 b.
Finally, the multi-head water chilling unit obtains the target rotating speed v of the first compressor 201a1And a target rotation speed v of the second compressor 201b2It is confirmed that the target rotation speed v of the first compressor 201a1Is greater than the target rotating speed v of the second compressor 201b2Therefore, the first compressor 201a is determined as the fourth target compressor, the second compressor 201b is determined as the fifth target compressor,and determining a target rotational speed increment deltav of the fourth target compressor according to the following formula4And a target rotational speed increment Δ v of a fifth target compressor5：
Target speed increment of fifth target compressor
Target speed increment of fourth target compressor
Wherein the content of the first and second substances,
the Δ v is a variation amount of the current rotation speed and is determined by the temperature information of the chilled water, which is a rotation speed coefficient.
The specific steps for reducing the head are described below:
the control method for the multi-head water chilling unit is based on the multi-head refrigeration system shown in FIG. 2, and the control method comprises the following execution steps:
first, the multi-head water chiller obtains the operating state of each compressor, determines that the fourth compressor 801a and the fifth compressor 801b are in the operating state and the sixth compressor 801c is in the shutdown state, determines that the sixth compressor 801c is the third target compressor, and determines that the fourth compressor 801a and the fifth compressor 801b are the first target compressor.
Secondly, the multi-head water chilling unit acquires that the rotation speeds of the fourth compressor 801a and the fifth compressor 801b are the lowest rotation speeds and the guide vane opening degrees of the fourth compressor 801a and the fifth compressor 801b are the minimum opening degrees, so that it is determined that the first target compressor is at the second preset load.
Then, the multi-faucet water chilling unit obtains a second current temperature value of the chilled water and a temperature change rate D2 of the second current temperature value within a second preset time period T2, and it is confirmed that the temperature change rate D2 is greater than zero and a third current temperature value within the second preset time period T2 is continuously less than the second preset temperature value, so that the multi-faucet water chilling unit performs the operation of reducing the faucet, specifically, the multi-faucet water chilling unit determines that the operation durations of the fourth compressor 801a and the fifth compressor 801b are T4 and T5 respectively and T4> T5, and determines that the fourth compressor 801a is a second target compressor.
Wherein the second preset temperature value satisfies
Finally, the multi-head water chilling unit controls the fourth compressor 801a to be switched from the running state to the shutdown state.
As shown in fig. 11, the present disclosure provides a control device for a multi-head water chilling unit, which includes a processor (processor)100 and a memory (memory) 101. Optionally, the apparatus may also include 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 a bus 103. The communication interface 102 may be used for information transfer. The processor 100 may call logic instructions in the memory 101 to execute the control method for the multi-head chiller of the above embodiment.
In addition, the logic instructions in the memory 101 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
The memory 101, which is a computer-readable storage medium, may be used for storing software programs, computer-executable programs, 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 executing program instructions/modules stored in the memory 101, that is, implements the control method for the multi-head water chilling unit in the above 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, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.
The embodiment of the disclosure provides a refrigeration device, which comprises the control device for the multi-head water chilling unit.
The embodiment of the disclosure provides a computer-readable storage medium, which stores computer-executable instructions configured to execute the control method for the multi-head water chilling unit.
The disclosed embodiments provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the above-described control method for a multiple-head chiller.
The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.
The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify 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. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "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, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would 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 may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The flowchart 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 disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (12)
1. A control method for a multi-head water chilling unit is characterized by comprising the following steps:
determining a compressor in a running state as a first target compressor;
acquiring operation information of the first target compressor and temperature information of the chilled water;
and executing the operation of increasing or decreasing the machine head according to the operation information and the temperature information.
2. The method of claim 1, wherein the temperature information of the chilled water comprises a temperature change rate of a first current temperature value in a first preset time period, and the performing of the operation of increasing or decreasing the handpiece according to the operation information and the temperature information comprises:
acquiring the temperature change rate of a first current temperature value in a first preset time period under the condition that the operation information indicates that the first target compressor is in a first preset load;
and executing the operation of newly adding the handpiece under the condition that the temperature change rate is smaller than a first preset change rate.
3. The method according to claim 2, wherein before obtaining the temperature change rate of the first current temperature value in the first preset time period, the method further comprises:
acquiring a first current temperature value of the chilled water;
and acquiring the temperature change rate of the first current temperature value in a first preset time period under the condition that the first current temperature value is greater than or equal to a first preset temperature value.
4. The method of claim 2, wherein the performing operations of the newly added handpiece comprises:
acquiring a first current temperature value of the chilled water;
determining a water temperature coefficient according to the first current temperature value and the preset temperature value;
and multiplying the water temperature coefficient by the total number of all the compressors to determine the number of the newly added machine heads.
5. The method of claim 2, wherein the performing operations of the newly added handpiece comprises:
determining the compressor in the shutdown state as a third target compressor;
acquiring the running time of the third target compressor;
and switching the third target compressor with the minimum running time length to a running state.
6. The method as claimed in claim 5, wherein the switching the third target compressor having the minimum operation time period to the operation state comprises:
determining a first target compressor with the maximum target rotating speed as a fourth target compressor, and determining a first target compressor with the minimum target rotating speed as a fifth target compressor;
determining a rotation speed coefficient according to the target rotation speed of the fourth target compressor and the target rotation speed of the fifth target compressor;
multiplying the variation of the current rotating speed by the rotating speed coefficient to determine the variation of the target rotating speed of the fifth target compressor;
multiplying the variation of the current rotating speed by the reciprocal of the rotating speed coefficient to determine the variation of the target rotating speed of the fourth target compressor;
wherein the amount of change in the current rotational speed is determined from temperature information of the chilled water.
7. The method of claim 1, wherein said performing an operation to increase or decrease a handpiece based on said operational information and said temperature information comprises:
and in the case that the operation information indicates that the first target compressor is operated by a preventive control strategy, performing the operation of increasing or decreasing the machine head according to the temperature information.
8. The method of claim 1, wherein the temperature information of the chilled water includes a rate of change of a second current temperature value within a second preset time period, and the performing of the operation of increasing or decreasing the head according to the operation information and the temperature information includes:
under the condition that the operation information indicates that the first target compressor is at a second preset load, acquiring a second current temperature value of the chilled water and a temperature change rate of the second current temperature value within a second preset time period;
and executing the operation of reducing the machine head under the condition that the temperature change rate is greater than zero and the second current temperature value is continuously less than a second preset temperature value in a second preset time period.
9. The method of claim 8, wherein the number of first target compressors is greater than or equal to a preset number, and wherein the performing the operation of reducing the head comprises:
acquiring the running time of the first target compressor;
determining a first target compressor with the maximum operation time as a second target compressor;
controlling the second target compressor to perform a shutdown operation.
10. The method of claim 8 or 9, further comprising:
and executing the operation of stopping the operation of all the machine heads under the condition that the second current temperature value is in a descending state and the second current temperature value is continuously less than or equal to the preset shutdown temperature difference value within a third preset time period.
11. A control device for a multi-head water chiller including a processor and a memory storing program instructions, characterized in that the processor is configured to execute the control method for a multi-head water chiller according to any one of claims 1 to 10 when executing the program instructions.
12. Refrigeration appliance, characterized in that it comprises a control device for a multiple-head water chiller according to claim 11.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115355648A (en) * | 2022-07-08 | 2022-11-18 | 珠海格力电器股份有限公司 | Control method and device for multi-module water chilling unit |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008002765A (en) * | 2006-06-23 | 2008-01-10 | Hitachi Appliances Inc | Heat source device |
| JP2010185629A (en) * | 2009-02-13 | 2010-08-26 | Nesutaa:Kk | Cold water machine |
| CN104748308A (en) * | 2015-03-30 | 2015-07-01 | 南京天加空调设备有限公司 | Control method for loading and load shedding of optimized module machine system |
| CN107655244A (en) * | 2017-07-31 | 2018-02-02 | 青岛海尔空调电子有限公司 | A kind of magnetic suspension centrifugal air conditioner group control method |
| CN107655245A (en) * | 2017-07-31 | 2018-02-02 | 青岛海尔空调电子有限公司 | A kind of magnetic suspension centrifugal air conditioner group load balance control method and system |
| CN109812949A (en) * | 2019-02-22 | 2019-05-28 | 广东欧科空调制冷有限公司 | A kind of load control method, device and the air-conditioning of multi-compressor unit |
| WO2020248764A1 (en) * | 2019-06-11 | 2020-12-17 | 青岛海尔空调电子有限公司 | Control method for air conditioning system, air conditioning control system, and air conditioning system |
| CN113203231A (en) * | 2021-05-07 | 2021-08-03 | 广州市华德工业有限公司 | Energy adjusting method and device of unit and unit |
-
2021
- 2021-09-23 CN CN202111115940.1A patent/CN113959128B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008002765A (en) * | 2006-06-23 | 2008-01-10 | Hitachi Appliances Inc | Heat source device |
| JP2010185629A (en) * | 2009-02-13 | 2010-08-26 | Nesutaa:Kk | Cold water machine |
| CN104748308A (en) * | 2015-03-30 | 2015-07-01 | 南京天加空调设备有限公司 | Control method for loading and load shedding of optimized module machine system |
| CN107655244A (en) * | 2017-07-31 | 2018-02-02 | 青岛海尔空调电子有限公司 | A kind of magnetic suspension centrifugal air conditioner group control method |
| CN107655245A (en) * | 2017-07-31 | 2018-02-02 | 青岛海尔空调电子有限公司 | A kind of magnetic suspension centrifugal air conditioner group load balance control method and system |
| CN109812949A (en) * | 2019-02-22 | 2019-05-28 | 广东欧科空调制冷有限公司 | A kind of load control method, device and the air-conditioning of multi-compressor unit |
| WO2020248764A1 (en) * | 2019-06-11 | 2020-12-17 | 青岛海尔空调电子有限公司 | Control method for air conditioning system, air conditioning control system, and air conditioning system |
| CN113203231A (en) * | 2021-05-07 | 2021-08-03 | 广州市华德工业有限公司 | Energy adjusting method and device of unit and unit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115355648A (en) * | 2022-07-08 | 2022-11-18 | 珠海格力电器股份有限公司 | Control method and device for multi-module water chilling unit |
| CN115355648B (en) * | 2022-07-08 | 2024-01-09 | 珠海格力电器股份有限公司 | Control method and device for multi-module water chilling unit |
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|---|---|
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