CN113959128B - Control method and device for multi-head water chilling unit, refrigeration equipment and medium - Google Patents
Control method and device for multi-head water chilling unit, refrigeration equipment and medium Download PDFInfo
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- CN113959128B CN113959128B CN202111115940.1A CN202111115940A CN113959128B CN 113959128 B CN113959128 B CN 113959128B CN 202111115940 A CN202111115940 A CN 202111115940A CN 113959128 B CN113959128 B CN 113959128B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The application relates to the technical field of refrigeration equipment, and discloses a control method for a multi-head water chilling unit, which comprises the following steps: determining that the compressor in the running state is a first target compressor; acquiring operation information of the first target compressor and temperature information of chilled water; and executing the operations of increasing and decreasing the machine head according to the operation information and the temperature information. The method can improve the accuracy of the determination of the time of increasing and decreasing the machine head, and realize the stable control of the temperature of the chilled water. The application also discloses a control device, refrigeration equipment and medium for the multi-head water chilling unit.
Description
Technical Field
The application relates to the technical field of refrigeration equipment, for example, to a control method and device for a multi-head water chilling unit, refrigeration equipment and medium.
Background
At present, centrifugal units are divided into a single machine head and a double machine head according to the number of machine heads. Since the centrifugal unit belongs to a commercial refrigerating unit, the commercial refrigerating unit has different demands on refrigerating capacity, and therefore, the centrifugal unit needs to meet commercial environments with different refrigerating capacity 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, and the stability of chilled water temperature control can be influenced. Therefore, the centrifugal unit is arranged in a plurality of multi-head compressors with small refrigerating capacity, and the number of heads is increased or decreased according to the actual refrigerating condition because the centrifugal unit is provided with the multi-head compressors.
The existing mode of increasing and decreasing the machine head is to collect the water outlet temperature of the cooling medium, when the water outlet problem of the cooling medium is stable, the ratio of the required refrigerating capacity to the unit design refrigerating capacity is calculated, the cold capacity demand coefficient is obtained, the number of the compressors to be put into is determined according to the cold capacity demand coefficient, then the compressors to be put into are controlled according to the water temperature regulation mode, and whether the cold capacity demand coefficient needs to be recalculated and the number of the compressors to be put into are determined according to the current water outlet temperature of the cooling medium and the current opening condition of the compressors.
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 water outlet temperature changes in real time, the running condition of the compressor in the opening state also changes in real time, whether the machine head needs to be increased or decreased cannot be accurately determined according to the current refrigerant water outlet temperature and the opening condition of the current compressor, and unstable control of the chilled water temperature can be caused.
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 control method, a control device, refrigeration equipment and a control medium for a multi-head water chilling unit, so as to improve the accuracy of determining the time for increasing and decreasing heads and realize stable control of the temperature of chilled water.
In some embodiments, the method comprises: determining that the compressor in the running state is a first target compressor; acquiring operation information of the first target compressor and temperature information of chilled water; and executing the operations of increasing and 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 configured to, when executing the program instructions, perform a control method for a multi-head chiller as previously described.
In some embodiments, the refrigeration appliance includes a control device for a multi-head chiller as previously described.
In some embodiments, the storage medium stores program instructions that, when executed, perform a control method for a multi-head chiller as previously described.
The control method, the 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 running information of the first target compressor can reflect the running condition of the compressor, and the method can realize the control of increasing and decreasing the machine head in cooperation with multi-azimuth factors according to the temperature condition of the chilled water and the running condition of the compressor in a running state, thereby improving the accuracy of determining the time of increasing and decreasing the machine head and realizing the stable control of the water 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 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 system schematic diagram 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 provided by an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of another control method for a multi-head chiller provided by an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of another control method for a multi-head chiller provided by an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of another control method for a multi-head chiller provided by an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of another control method for a multi-head chiller provided by an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of another control method for a multi-head chiller provided by an embodiment of the present disclosure;
FIG. 9 is a schematic diagram of another control method for a multi-head chiller provided by an embodiment of the present disclosure;
FIG. 10 is a schematic diagram of another control method for a multi-head chiller provided by an embodiment of the present disclosure;
FIG. 11 is a schematic diagram of another control method for a multi-head chiller provided by an embodiment of the present disclosure;
FIG. 12 is a schematic diagram of another control method for a multi-head chiller provided by 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 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.
One system schematic of a multi-head refrigeration system is shown in fig. 1, the multi-head refrigeration system comprising 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 third condenser 301c, and a first control assembly. The first evaporator 101a is provided in communication with the first compressor 201a and the first condenser 301a to form a circulation refrigeration circuit. The second evaporator 101b is provided in communication with the second compressor 201b and the second condenser 301b to form a circulation refrigeration circuit. The third evaporator 101c is provided in communication with the third compressor 201c and the third condenser 301c to form a circulation refrigeration circuit. A first bypass line and a first auxiliary liquid line are provided between the first evaporator 101a and the first condenser 301a, the first bypass line being provided with a first bypass valve 401a, and the first auxiliary liquid line being provided with a first electronic expansion valve 501a. A second bypass line and a second auxiliary liquid line are provided between the second evaporator 101b and the second condenser 301b, the second bypass line being provided with a second bypass valve 401b, the second auxiliary liquid line being provided with a second electronic expansion valve 501b. A third bypass line and a third auxiliary liquid line are provided between the third evaporator 101c and the third condenser 301c, the third bypass line being provided with a third bypass valve 401c, the third auxiliary liquid line being provided with a third electronic expansion valve 501c. Wherein, the three circulation refrigeration loops independently operate and share a cooling water system. The first control component executes a control method for the multi-head water chiller as follows. Taking the circulating 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 comprising 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 provided between the fourth evaporator 600 and the fourth condenser 700, the fourth bypass line being provided with a fourth bypass valve 1200, the fourth auxiliary liquid line being 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 form a circulation refrigeration circuit with the fourth evaporator 600 and the fourth condenser 700, respectively. Wherein the plurality of compressors share a cooling water system. The second control assembly of the plurality of compressors performs a control method for the multi-head chiller as follows. Each cut-in valve (901 a, 901b, 901 c) is opened when the compressor (801 a, 801b, 801 c) corresponding to each cut-in valve is started and is closed after the start of the compressor (801 a, 801b, 801 c) corresponding to each cut-in valve is completed, and is opened when the compressor (801 a, 801b, 801 c) 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 disclosure provides a control method for a multi-head water chiller, including:
s01, the multi-head water chiller determines that the compressor in the running state is a first target compressor.
S02, the multi-head water chiller acquires the operation information of the first target compressor and the temperature information of chilled water.
S03, executing the operation of increasing and decreasing the machine heads of the multi-machine head water chilling unit according to the operation information and the temperature information.
By adopting the control method for the multi-head water chilling unit, which is provided by the embodiment of the invention, the operation information of the first target compressor can reflect the operation condition of the compressors, and the method can realize the control of increasing and decreasing the heads according to the temperature condition of chilled water and the operation condition of the compressors in an operation state in cooperation with multi-azimuth factors, thereby improving the accuracy of determining the time of increasing and decreasing the heads and realizing the stable control of the temperature of the chilled water.
It will be appreciated that in the case where the multi-head refrigeration system is the system shown in fig. 1, the operation of increasing or decreasing the heads is performed to turn on/off one or more refrigeration cycle circuits in a stopped state. In the case where the multi-head refrigeration system is the system shown in fig. 2, the operation of increasing or decreasing the heads is performed to turn on/off one or more compressors in a stopped state.
Optionally, the temperature information of the chilled water includes a temperature change rate of the first current temperature value within a first preset time period. Referring to fig. 4, according to the operation information and the temperature information, operations of increasing or decreasing the handpiece are performed, including:
s11, under the condition that the operation information indicates that the first target compressor is at a first preset load, the multi-head water chilling unit acquires the temperature change rate of a first current temperature value in a first preset time period.
S12, under the condition that the temperature change rate of the multi-head water chilling unit is smaller than the first preset change rate, the multi-head water chilling unit executes the operation of the newly added head.
Thus, 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-head water chiller acquires the temperature change rate of the first current temperature value in the first preset time period. When the temperature change rate is smaller than a first preset change rate, the first target compressor which has reached the highest load cannot quickly reduce the first current temperature value of the chilled water, and therefore the temperature of the chilled water cannot be controlled stably, and the multi-head water chiller performs the operation of the newly added head so as to realize stable control of the temperature of the chilled water.
Optionally, as shown in fig. 5, according to the operation information and the temperature information, operations of increasing or decreasing the handpiece are performed, including:
s21, under the condition that the operation information indicates that the first target compressor is at a first preset load, the multi-head water chiller acquires a first current temperature value of chilled water.
S22, under the condition that the first current temperature value is larger than or equal to a first preset temperature value, the multi-head water chilling unit acquires the temperature change rate of the first current temperature value in a first preset time period.
S22, under the condition that the temperature change rate of the multi-head water chilling unit is smaller than the first preset change rate, the multi-head water chilling unit executes the operation of the newly added head.
In this way, after it is determined that the first target compressor has reached the highest load, the first current temperature value is compared with the first preset temperature value, and if the first current temperature value is greater than or equal to the first preset temperature value, it is indicated that the first target compressor does not achieve effective control of the chilled water temperature, and at this time, a change condition of the first current temperature value is determined by acquiring a temperature change rate of the first current temperature value, so as to achieve a new head operation according to the change condition.
Optionally, as shown in connection with fig. 6, performing the operation of the additional handpiece includes:
S31, the multi-head water chiller determines that the compressor in the stop state is a third target compressor.
S32, the multi-head water chiller judges whether the shutdown time interval of the third target compressor is larger than or equal to a preset time interval, and if yes, S33 is executed.
S33, controlling the third target compressor to be switched from a stop state to an operation state by the multi-head water chiller.
Therefore, since frequent start and stop of the compressor can cause operation failure of the compressor, a preset time interval can be set, the stop time interval of the third target compressor can be compared with the preset time interval, and when the stop time interval is equal to or longer than the preset time interval, the operation of the newly added machine head is executed again, so that stable operation of the third target compressor is realized.
Optionally, the operation information of the first target compressor includes a rotation speed and a guide vane opening. The first target compressor is determined to be at a first preset load in the following manner:
the rotating speed of the first target compressor is matched with the highest rotating speed; and/or the opening degree of the guide vane of the first target compressor is matched with the maximum opening degree.
In this way, when the rotational speed of the first target compressor matches the maximum rotational speed and when the vane opening of the first target compressor matches the maximum opening, 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 located in a preset range corresponding to the highest rotation speed. The vane opening of the first target compressor is matched with the maximum opening, and the vane opening of the first target compressor can be located in a preset range corresponding to the maximum opening.
It should be noted that, the maximum rotation speed may be determined by the type selection of the pneumatic design motor of the compressor, or may be determined according to the maximum rotation speed corresponding to the operation condition. As one example, the highest rotational speed is equal to the product of the surge speed and a first preset coefficient. The first preset coefficient is greater than 1. Embodiments of the present disclosure may not be particularly limited thereto.
Referring to fig. 7, operations for increasing or decreasing the handpiece are performed according to the operation information and the temperature information, including:
s41, under the condition that the operation information indicates that the first target compressor is at a first preset load, the multi-head water chilling unit acquires the temperature change rate of the first current temperature value in a first preset time period.
S42, under the condition that the temperature change rate of the multi-machine-head water chilling unit is smaller than the first preset change rate, the multi-machine-head water chilling unit obtains a first current temperature value of chilled water.
S43, the multi-head water chilling unit determines a water temperature coefficient according to the first current temperature value and the preset temperature value.
S44, multiplying the water temperature coefficient by the total number of all compressors by the multi-head water chilling unit to determine the number of newly added heads.
The total number of all compressors is the sum of the number of compressors configured by the multi-head water chiller.
Therefore, the water temperature coefficient is determined 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, the larger the number of the determined newly-added machine heads is, and therefore the number of the machine heads can be controlled in real time according to the difference condition between the real-time temperature value of the chilled water and the preset temperature value.
In practical application, the number of newly added machine heads is determined according to the following mode:
number of new heads = total number of all compressors x k× [ first current temperature value-preset temperature value ];
wherein [ (] represents a downward rounding), 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 connection with fig. 8, operations of the newly added handpiece are performed, including:
s51, the multi-head water chiller determines that the compressor in the stop state is a third target compressor.
S52, the multi-head water chiller acquires the operation time of the third target compressor.
S53, the multi-head water chiller switches the third target compressor with the minimum operation time to an operation state.
Therefore, the running time length represents the accumulated time length of the compressors in the historical running stage, and the smaller the accumulated time length is, the higher the running stability of the corresponding compressors is, so that the multi-head water chilling unit selects the third target compressor with the smallest running time length to be switched into the running state, and the multi-head water chilling unit operated by the newly added head can realize stable control of water temperature.
As shown in connection with fig. 9, operations of the newly added handpiece are performed, including:
s61, the multi-head water chiller determines that the compressor in the stop state is a third target compressor.
S62, the multi-head water chiller acquires the operation time of the third target compressor.
S63, the multi-head water chiller switches the third target compressor with the minimum operation time to an operation state.
S64, the multi-head water chiller determines a first target compressor with the largest target rotating speed as a fourth target compressor, and determines a first target compressor with the smallest target rotating speed as a fifth target compressor.
S65, the multi-head water chiller determines 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.
And S66, multiplying the change amount of the current rotating speed and the rotating speed coefficient by the multi-head water chilling unit to determine the change amount of the target rotating speed of the fifth target compressor.
S67, the multi-head water chiller multiplies the change amount of the current rotating speed by the inverse of the rotating speed coefficient to determine the change amount of the target rotating speed of the fourth target compressor.
Wherein the change amount of the current rotating speed is determined by the temperature information of the chilled water.
Therefore, the actual rotation speeds of the first target compressors are not identical, and the actual rotation speeds of the first target compressors need to be adjusted when the new machine head is executed, so that the speeds of the first target compressors in the running state are as close as possible, and the situation that the actual rotation speeds of the first target compressors are large in difference is avoided. Therefore, the multi-head water chiller 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 respective target rotating speeds of the fourth target compressor and the fifth target compressor. The target rotation speed of the fifth target compressor is minimum, the target rotation speed of the fifth target compressor needs to be rapidly increased, the target rotation speed of the fourth target compressor needs to be increased, and the target rotation speed of the fourth target compressor needs to be increased by a small extent, so that the change amount of the current rotation speed is multiplied by the rotation speed coefficient, the change amount of the target rotation speed of the fifth target compressor is determined, and the change amount of the target rotation speed of the fourth target compressor is determined by multiplying the change amount of the current rotation speed by the reciprocal of the rotation speed coefficient. The method can realize the linear proportion adjustment of the rotational speeds of the first target compressors with the maximum and minimum actual rotational speeds, so that the new target rotational speeds of the adjusted first target compressors are gradually close to each other, and the stable operation of the multi-head water chiller is realized.
The multi-head water chiller determines 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, and may determine the rotation speed coefficient by comparing the target rotation speed of the fourth target compressor with the target rotation speed of the fifth target compressor.
The aforementioned amount of change in the target rotational speed refers to a rotational speed increase.
It should be noted that, after the multi-head water chiller switches the third target compressor with the minimum operation duration 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 one example, when the number of first target compressors is one, the initial target rotational speed may be a surge speed of the first target compressor. As another example, when the number of first target compressors is two or more, the initial target rotational speed may be a maximum value of the surge speeds of the two or more first target compressors. The initial vane opening may be a preset opening or a maximum opening. Embodiments of the present disclosure may not be particularly limited thereto.
Optionally, according to the operation information and the temperature information, performing the operation of increasing or decreasing the handpiece, including:
In the case where the operation information indicates that the first target compressor is operated with the preventive control strategy, an operation of increasing or decreasing the head is performed according to the temperature information.
The prevention control strategy refers to a protection strategy of limiting load increase preset by the multi-head water chiller, namely, the load increase amount is determined according to the running information of the compressor, and early warning or shutdown is carried out when the increment of the rotating speed of the compressor is higher than Yu Zeng load. 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 running information; and adjusting the current rotating speed of the compressor according to the target unloading information. The operation information can be parameters such as a current value, a suction pressure value, a discharge pressure value, a frequency converter temperature value, a pressure ratio value and the like of the compressor.
As shown in fig. 10, the embodiment of the disclosure further provides a control method for a multi-head water chiller, including:
s71, the multi-head water chiller determines that the compressor in the running state is the first target compressor.
S72, the multi-head water chiller acquires the operation information of the first target compressor and the temperature information of chilled water.
And S73, under the condition that the operation information indicates that the first target compressor is at a second preset load, the multi-head water chiller acquires a second current temperature value of chilled water and a temperature change rate of the second current temperature value in a second preset time period.
And S74, under the condition that the temperature change rate is greater than zero and the second current temperature value is continuously smaller than the second preset temperature value in the second preset time period, the multi-head water chiller performs the operation of reducing the heads.
By adopting the control method for the multi-head 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 enough to effectively control the chilled water temperature, and at the moment, in order to improve the running efficiency of the multi-head water chiller, the operation of reducing the heads can be realized according to the change condition.
Wherein the second preset temperature value is determined by the following formula:
wherein the preset shutdown temperature difference value is a shutdown temperature value preset by the multi-head water chilling unit, K 0 Representing the weight coefficient, 1<K 0 <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 smaller than the second preset temperature value within the second preset time period, after the multi-head water chiller performs the operation of reducing the head, the multi-head water chiller delays for a fourth preset time period after reducing the head, the operation information of the first target compressor and the temperature information of the chilled water are obtained again, and whether the subsequent head increasing and decreasing operation is needed is judged according to the new operation information and the new temperature information obtained again.
Optionally, the operation information of the first target compressor includes a rotation speed and a guide vane opening, and the first target compressor is determined to be at the second preset load according to the following manner:
the rotation speed of the first target compressor is matched with the lowest rotation speed; and/or the opening degree of the guide vane of the first target compressor is matched with the minimum opening degree.
In this way, when the rotational speed of the first target compressor matches the minimum rotational speed and when the vane opening of the first target compressor matches the minimum opening, 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 located in a preset range corresponding to the lowest rotation speed. The vane opening of the first target compressor is matched with the minimum opening, and the vane opening of the first target compressor can be located in a preset range corresponding to the minimum opening.
It should be noted that, the lowest rotation speed refers to a rotation speed minimum value corresponding to the compressor when the compressor is operated under the current working condition of the compressor, and if the compressor is operated at a rotation speed value lower than the lowest rotation speed, a surge risk may occur.
Optionally, as shown in connection with fig. 11, the number of the first target compressors is greater than or equal to a preset number, and performing the operation of reducing the handpiece includes:
S81, the multi-head water chiller acquires the operation time of the first target compressor.
S82, the multi-head water chiller determines the first target compressor with the largest operation duration as the second target compressor.
S83, the multi-head water chiller controls the second target compressor to execute stopping operation.
Thus, the running duration represents the accumulated duration of the compressors in the historical running stage, and the greater the accumulated duration is, the lower the running stability of the corresponding compressors is, so that the multi-head water chiller can be switched to the running state by selecting the second target compressor with the largest running duration, and the multi-head water chiller with reduced head operation can realize stable control of water temperature and improve the running efficiency of the multi-head water chiller.
As shown in fig. 12, the embodiment of the disclosure further provides a control method for a multi-head water chiller, including:
s91, the multi-head water chiller determines that the compressor in the running state is the first target compressor.
S92, the multi-head water chiller acquires the operation information of the first target compressor and the temperature information of chilled water.
And S93, under the condition that the operation information indicates that the first target compressor is at a second preset load, the multi-head water chiller acquires a second current temperature value of chilled water and a temperature change rate of the second current temperature value in a second preset time period.
S94, under the condition that the temperature change rate is greater than zero and the second current temperature value is continuously smaller than the second preset temperature value in the second preset time period, the multi-head water chiller performs the operation of reducing the heads.
S95, under the condition that the second current temperature value is in a descending state and the second current temperature value is continuously smaller than or equal to a preset shutdown temperature difference value in a third preset time period, the multi-machine head water chilling unit executes operation of stopping operation of all machine heads.
By adopting the control method for the multi-head water chiller 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 smaller than or equal to the preset shutdown temperature difference value in the third preset time period, the operation of the multi-head water chiller is described as being faulty, shutdown processing is needed, and at this time, the multi-head water chiller executes the operation of stopping the operation of all heads.
Wherein the second preset temperature value is greater than the preset shutdown temperature difference.
It should be noted that, the multi-machine-head water chiller synchronously monitors the change rate of the second current temperature value and the second current temperature value, and when the second current temperature value is in a descending state and the second current temperature value in the third preset time period is less than or equal to the preset shutdown temperature difference value, the multi-machine-head water chiller executes the operation of stopping the operation of all the machine heads.
Optionally, the second current temperature value is determined to be in a reduced state in the following manner:
the obtained change rate of the second current temperature value in the second preset time period is smaller than the second preset change rate. Wherein the second preset rate of change is less than zero.
In practical application, the following specific steps for adding the handpiece are described:
the control method for the multi-head chiller is based on the multi-head refrigerating system shown in fig. 1, and the control method comprises the following execution steps:
first, the multi-head chiller obtains the operation states of the compressors, determines that the first and second compressors 201a and 201b are in the operation states and the third compressor 201c is in the stop state, and determines that the first and second compressors 201a and 201b are the first target compressors.
Secondly, the multi-head water chiller acquires that the rotational speeds of the first compressor 201a and the second compressor 201b are both the highest rotational speeds and the opening degrees of the guide vanes of the first compressor 201a and the second compressor 201b are both the largest opening degrees, thereby determining that the first target compressor is at the first preset load.
Then, the multi-head chiller acquires a temperature change rate D1 of the first current temperature value within the first preset time period T1, and the temperature change rate D1 is confirmed to be smaller than the first preset change rate, so that the multi-head chiller performs the operation of the newly added head, specifically, the multi-head chiller determines that the third compressor 201c is in a stopped state, and determines that the third compressor 201c is the third target compressor.
Again, the multi-head chiller determines that the shutdown interval of the third compressor 201c is greater than the preset interval, and therefore, the multi-head chiller controls the third compressor 201c to switch from the shutdown state to the running state, and determines the initial vane opening of the third compressor 201c to be the maximum opening.
Then, the multi-head chiller acquires the surge speeds of the first compressor 201a and the second compressor 201b, and confirms that the surge speed of the first compressor 201a is higher than the surge speed 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 chiller obtains the target speed v of the first compressor 201a 1 And a target rotation speed v of the second compressor 201b 2 It is confirmed that the target rotation speed v of the first compressor 201a 1 Greater than the target rotational speed v of the second compressor 201b 2 Accordingly, the first compressor 201a is determined as the fourth target compressor, the second compressor 201b is determined as the fifth target compressor, and the target rotation speed increment Δv of the fourth target compressor is determined according to the following formula 4 And a target rotation speed increment Deltav of the fifth target compressor 5 ：
Target speed increment of fifth target compressor
Target speed increment of fourth target compressor 
Wherein, the liquid crystal display device comprises a liquid crystal display device,
as the rotation speed coefficient, Δv is the variation of the current rotation speed and is determined by the temperature information of the chilled water.
The following describes the specific steps for reducing the handpiece:
the control method for the multi-head chiller 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 chiller obtains the operation states of the compressors, determines that the fourth compressor 801a and the fifth compressor 801b are in the operation state and the sixth compressor 801c is in the stop 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 chiller acquires that the rotational speeds of the fourth compressor 801a and the fifth compressor 801b are both the lowest rotational speeds and the opening degrees of the guide vanes of the fourth compressor 801a and the fifth compressor 801b are both the smallest opening degrees, thereby determining that the first target compressor is at the second preset load.
Then, the multi-head water chiller acquires a second current temperature value of chilled water and a temperature change rate D2 of the second current temperature value in a second preset time period T2, and the temperature change rate D2 is confirmed to be greater than zero, and a third current temperature value in the second preset time period T2 is continuously smaller than the second preset temperature value, so that the multi-head water chiller performs an operation of reducing the head, specifically, the multi-head water chiller acquires a determination that the operation duration of the fourth compressor 801a and the fifth compressor 801b is T4 and T5, and T4> T5, respectively, and determines that the fourth compressor 801a is a second target compressor.
Wherein the second preset temperature value satisfies
Finally, the multi-head chiller controls the fourth compressor 801a to switch from an operating state to a shutdown state.
Referring to fig. 11, an embodiment of the present disclosure provides a control apparatus for a multi-head chiller, 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. Processor 100 may invoke logic instructions in memory 101 to perform the control method for a multi-head chiller in accordance with 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 the program instructions/modules stored in the memory 101 to perform the functional application and data processing, i.e., to implement the control method for the multi-head chiller in the above embodiment.
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 refrigeration equipment, which comprises the control device for a multi-head water chilling unit.
The embodiment of the disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the control method for a multi-head chiller set.
Embodiments of the present disclosure 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 control method for a multi-head chiller as described above.
The computer readable 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 (9)
1. The control method for the multi-head water chilling unit is characterized by comprising the following steps of:
determining that the compressor in the running state is a first target compressor;
acquiring operation information of the first target compressor and temperature information of chilled water;
executing the operations of increasing and decreasing the machine head according to the operation information and the temperature information;
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 operations of increasing and decreasing the machine head are executed according to the operation information and the temperature information, and the operations comprise the following steps:
acquiring a temperature change rate of a first current temperature value in a first preset time period under the condition that the running information indicates that the first target compressor is under a first preset load;
executing the operation of the newly added machine head under the condition that the temperature change rate is smaller than a first preset change rate;
the operation of executing the newly added handpiece comprises the following steps:
determining that the compressor in the shutdown state is a third target compressor;
acquiring the operation time length of the third target compressor, wherein the operation time length represents the accumulated time length of the compressor in a historical operation stage;
switching the third target compressor with the minimum operation time to an operation state;
After the third target compressor with the minimum operation duration is switched to the operation state, the method comprises the following steps:
determining a first target compressor with the largest target rotating speed as a fourth target compressor, and determining a first target compressor with the smallest 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 change amount of the current rotating speed by the rotating speed coefficient to determine the change amount of the target rotating speed of the fifth target compressor;
multiplying the change amount of the current rotating speed by the reciprocal of the rotating speed coefficient to determine the change amount of the target rotating speed of the fourth target compressor;
wherein the change amount of the current rotating speed is determined by the temperature information of the chilled water.
2. The method of claim 1, wherein prior to the obtaining the temperature change rate of the first current temperature value for the first preset time period, further comprising:
acquiring a first current temperature value of the chilled water;
and under the condition that the first current temperature value is larger than or equal to a first preset temperature value, acquiring the temperature change rate of the first current temperature value in a first preset time period.
3. The method of claim 1, wherein the performing the operation of the add-on handpiece further comprises:
acquiring a first current temperature value of the chilled water;
determining a water temperature coefficient according to the first current temperature value and a preset temperature value;
and multiplying the water temperature coefficient by the total number of all compressors to determine the number of newly added machine heads.
4. The method of claim 1, wherein said performing an operation of increasing or decreasing the handpiece based on the operation information and the temperature information comprises:
and executing the operation of increasing or decreasing the handpiece according to the temperature information under the condition that the operation information indicates that the first target compressor operates according to a preventive control strategy.
5. The method of claim 1, wherein the chilled water temperature information includes a rate of change of a second current temperature value over a second predetermined period of time, and wherein the performing the operations of increasing or decreasing the handpiece based on the operating information and the temperature information includes:
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 under the condition that the running information indicates that the first target compressor is at a second preset load;
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 smaller than a second preset temperature value in the second preset time period.
6. The method of claim 5, wherein the number of first target compressors is greater than or equal to a preset number, the performing operations to reduce a handpiece comprising:
acquiring the operation time length of the first target compressor;
determining the first target compressor with the largest operation duration as a second target compressor;
and controlling the second target compressor to execute a stopping operation.
7. The method according to claim 5 or 6, 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 smaller than or equal to a preset shutdown temperature difference value in a third preset time period.
8. A control apparatus for a multi-head chiller, comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the control method for a multi-head chiller as claimed in any one of claims 1 to 7 when the program instructions are run.
9. A refrigeration apparatus comprising the control device for a multi-head chiller according to claim 8.
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