CN112432327A - Air conditioning system water chilling unit operation control method and device and air conditioning system - Google Patents
Air conditioning system water chilling unit operation control method and device and air conditioning system Download PDFInfo
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- CN112432327A CN112432327A CN202011313716.9A CN202011313716A CN112432327A CN 112432327 A CN112432327 A CN 112432327A CN 202011313716 A CN202011313716 A CN 202011313716A CN 112432327 A CN112432327 A CN 112432327A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The application relates to an air conditioning system water chilling unit operation control method and device and an air conditioning system, and belongs to the technical field of air conditioning control. The application includes: judging whether the operation of the air conditioning system meets a preset loading condition or a preset unloading condition; if the loading condition is met, selecting the non-operated water chilling unit and the channel equipment thereof according to a first control strategy, carrying out starting control on the selected non-operated channel equipment, and then issuing a starting instruction to the selected non-operated water chilling unit; and if the load shedding condition is met, selecting the running water chilling unit and the channel equipment thereof according to a second control strategy, sending a shutdown instruction to the selected running water chilling unit, and then closing and controlling the selected running channel equipment. Through the application, the refrigeration of the air conditioning system is facilitated, and meanwhile, energy conservation and stable operation are realized.
Description
Technical Field
The application belongs to the technical field of air conditioner control, and particularly relates to an air conditioning system water chilling unit operation control method and device and an air conditioning system.
Background
In the central air-conditioning refrigeration system, the control of the number of the running water chilling units of the system is an important control part of the central air-conditioning refrigeration system. In actual operation, the problem of unmatched operation number of the water chilling units can be caused by the change of the number of the internal units of the air conditioning system, and if the number of the water chilling units is too large, the whole central air conditioning system cannot save energy; if the number of the running water chilling units is small, the overall refrigerating capacity is small and the cooling requirement of the system can not be met. Therefore, how to control the number of the running water chilling units in the central air-conditioning refrigeration system is related to whether the system can run stably and in an energy-saving way.
Disclosure of Invention
In order to overcome the problems in the related art at least to a certain extent, the application provides the operation control method and device for the water chilling unit of the air conditioning system and the air conditioning system, which are beneficial to meeting the requirement of refrigeration of the air conditioning system and realizing energy-saving and stable operation.
In order to achieve the purpose, the following technical scheme is adopted in the application:
in a first aspect,
the application provides an operation control method for a water chilling unit of an air conditioning system, which comprises the following steps:
judging whether the operation of the air conditioning system meets a preset loading condition or a preset unloading condition;
if the loading condition is met, selecting the non-operated water chilling unit and the channel equipment thereof according to a first control strategy, carrying out starting control on the selected non-operated channel equipment, and then issuing a starting instruction to the selected non-operated water chilling unit; and if the load shedding condition is met, selecting the running water chilling unit and the channel equipment thereof according to a second control strategy, sending a shutdown instruction to the selected running water chilling unit, and then closing and controlling the selected running channel equipment.
Further, the judging that the operation of the air conditioning system meets the loading condition comprises:
if the operation of the air conditioning system meets the following five conditions, judging that the loading condition is met:
2.1, the running time of the previous unit is more than or equal to a, wherein a is the loading interval time of the preset unit;
2.2, the number of the water paths which can be used is more than or equal to (the number of the running water chilling unit + b), wherein b is a preset revision value;
2.3, the average load of the started unit is more than c, wherein c is a preset engine adding load set value;
2.4, the return water temperature drop rate of the freezing main pipe is less than d, wherein d is a preset drop rate set value;
2.5, conditions 2.3 and 2.4 are met for e minutes, where e is a preset time set value.
Further, the judging that the operation of the air conditioning system meets the loading condition comprises:
if the operation of the air conditioning system meets the following four conditions, judging that the loading condition is met:
3.1, the running time of the previous unit is more than or equal to f, wherein f is the preset starting loading time;
3.2, the number of the water paths which can be used is more than or equal to (the number of the running water chilling unit + g), wherein g is a preset revision value;
3.3, the water supply temperature of the freezing main pipe is > (h + i), wherein h is a preset water outlet temperature set value of the freezing main pipe, and i is a preset deviation value;
3.4, condition 3.3 is satisfied for j minutes, where j is a preset time set value.
Further, the step of selecting the water chilling unit which does not operate and the channel equipment thereof according to the first control strategy comprises the following steps:
and when the loading condition is met, selecting an un-operated water chilling unit, an un-operated cooling water pump, an un-operated refrigerating water pump and an un-operated cooling tower in the air conditioning system according to a first selection strategy.
Further, the first selection policy includes: a minimum run-time policy.
Further, the controlling, according to the first control strategy, the starting of the selected non-operating channel device, and then issuing the starting instruction to the selected non-operating chiller unit includes:
starting the selected cooling water pump, and keeping the frequency of the selected cooling water pump consistent with the frequency of the operated cooling water pump;
when the selected cooling water pump runs for a first preset time length, opening a cooling side electric butterfly valve of the selected water chilling unit and an electric butterfly valve of the selected cooling tower;
when the electric butterfly valve at the cooling side of the selected water chilling unit and the electric butterfly valve of the selected cooling tower are opened in place, the selected chilled water pump is started, and the frequency of the chilled water pump is consistent with the frequency of the running chilled water pump;
when the selected chilled water pump operates for a second preset time length, opening a chilled side electric butterfly valve of the selected water chilling unit;
when the electric butterfly valve at the freezing side of the selected water chilling unit is opened in place, whether the running number of the freezing water pump and the cooling water pump in the air conditioning system is consistent with the number of the channels of the started water chilling unit is judged, and if so, a starting instruction is issued to the selected water chilling unit which is not running.
Further, the judging that the operation of the air conditioning system meets the load shedding condition comprises the following steps:
if the operation of the air conditioning system meets the following three conditions, judging that the load shedding condition is met:
7.1, the running time of the previous unit is more than or equal to k, wherein k is the load shedding interval time of the preset unit;
7.2, the average load of the started units corresponding to the currently-operated water chilling unit is less than the preset load reducing set value corresponding to the currently-operated water chilling unit, wherein the preset load reducing set value corresponding to the currently-operated water chilling unit and the number of the currently-operated water chilling units have a preset corresponding relation;
7.3, the condition 7.2 is met for continuous l minutes, wherein l is a preset time set value.
Further, the judging that the operation of the air conditioning system meets the load shedding condition comprises the following steps:
if the operation of the air conditioning system meets the following three conditions, judging that the load shedding condition is met:
8.1, the running time of the previous unit is more than or equal to m, wherein m is the preset starting deloading time;
8.2, the outlet water temperature of the freezing main pipe is less than (n-p), wherein n is the outlet water temperature set value of the freezing main pipe, and p is the difference set value;
8.3, the condition 8.2 is met for continuous q minutes, wherein q is a preset time set value.
Further, the selecting the running water chilling unit and the channel equipment thereof according to the second control strategy comprises:
and when the load shedding condition is met, selecting an operated water chilling unit, an operated cooling water pump, an operated refrigerating water pump and an operated cooling tower in the air conditioning system according to a second selection strategy.
Further, the second selection policy includes: a maximum run time policy.
Further, wherein, according to the second control strategy, issuing a shutdown instruction to the selected running water chilling unit, and then performing shutdown control on the selected running channel device includes:
sending a shutdown instruction to the selected water chilling unit;
starting timing after the selected water chilling unit stops, and closing the electric butterfly valve at the cooling side of the selected water chilling unit and the electric butterfly valve of the selected cooling tower when the timing time reaches a third preset time;
when the electric butterfly valve at the cooling side of the selected water chilling unit and the electric butterfly valve of the selected cooling tower are closed in place, closing the selected cooling water pump;
when the selected cooling water pump is closed to reach a fourth preset time length, closing the electric butterfly valve at the freezing side of the selected water chilling unit;
and when the electric butterfly valve at the freezing side of the selected water chilling unit is closed in place, closing the selected freezing water pump.
In a second aspect of the present invention,
the application provides an air conditioning system cooling water set operation control device includes:
the judging module is used for judging whether the operation of the air conditioning system meets a preset loading condition or a preset load shedding condition;
the loading and unloading module is used for selecting the non-operated water chilling unit and the channel equipment thereof according to a first control strategy if the loading condition is met, carrying out starting control on the selected non-operated channel equipment and then issuing a starting instruction to the selected non-operated water chilling unit; and if the load shedding condition is met, selecting the running water chilling unit and the channel equipment thereof according to a second control strategy, sending a shutdown instruction to the selected running water chilling unit, and then closing and controlling the selected running channel equipment.
In a third aspect,
the application provides an air conditioning system, includes:
one or more memories having executable programs stored thereon;
one or more processors configured to execute the executable program in the memory to implement the steps of any of the methods described above.
This application adopts above technical scheme, possesses following beneficial effect at least:
in the operation process of the air conditioning system, when the loading condition or the unloading condition is met, the proper water chilling unit and the channel equipment thereof are selected according to the corresponding control strategy, and the selected water chilling unit and the channel equipment thereof are sequentially controlled, so that the stable loading and unloading of the water chilling unit are optimized on the premise that the air conditioning system meets the cooling demand of a user, and the energy-saving and stable operation of the air conditioning system is further realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart illustrating a method for controlling the operation of a chiller in an air conditioning system according to an exemplary embodiment;
fig. 2 is a schematic structural diagram illustrating an operation control apparatus of a chiller of an air conditioning system according to an exemplary embodiment;
fig. 3 is a schematic diagram illustrating the structure of an air conditioning system according to an exemplary embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a flowchart illustrating an operation control method for a chiller of an air conditioning system according to an exemplary embodiment, where as shown in fig. 1, the operation control method for the chiller of the air conditioning system includes the following steps:
step S101, judging whether the operation of the air conditioning system meets a preset loading condition or a preset unloading condition;
step S102, if the loading condition is met, selecting a non-operated water chilling unit and channel equipment thereof according to a first control strategy, carrying out starting control on the selected non-operated channel equipment, and then issuing a starting instruction to the selected non-operated water chilling unit; and if the load shedding condition is met, selecting the running water chilling unit and the channel equipment thereof according to a second control strategy, sending a shutdown instruction to the selected running water chilling unit, and then closing and controlling the selected running channel equipment.
The air conditioning system is operated by using the scheme, in the operation process, when the loading condition or the unloading condition is met, the proper water chilling unit and the channel equipment thereof are selected according to the corresponding control strategy to participate in the loading and unloading, then the selected water chilling unit and the channel equipment thereof are sequentially controlled, specifically, when the loading condition is met, the proper water chilling unit and the channel equipment thereof are selected according to the first control strategy, then the selected channel equipment is started, then the selected water chilling unit is started, and when the unloading condition is met, the proper water chilling unit and the channel equipment thereof are selected according to the second control strategy, then the selected water chilling unit is closed, and then the selected channel equipment is closed. The appropriate water chilling unit and the channel equipment thereof are selected, and the selected water chilling unit and the channel equipment thereof are sequentially controlled under the corresponding control strategy, so that the stable loading and unloading of the water chilling unit are optimized on the premise that the air conditioning system meets the cooling demand of a user, and the energy-saving and stable operation of the air conditioning system is further realized.
In one embodiment, wherein determining that the air conditioning system operation satisfies the loading condition comprises:
if the operation of the air conditioning system meets the following five conditions, judging that the loading condition is met:
2.1, the running time of the previous unit is more than or equal to a, wherein a is the loading interval time of the preset unit, and can be set to 10 seconds for example;
2.2, the number of available water paths is more than or equal to (the number of running water chilling units + b), wherein b is a preset revision value, for example, b can be set to 1;
2.3, the average load of the started unit is more than c, wherein c is a preset engine load setting value, the average load of the started unit can be obtained by taking an arithmetic average value of the unit load of the running water chilling unit, and c can be 90% of the maximum load;
2.4, the return water temperature drop rate of the freezing main pipe is less than d, wherein d is a preset drop rate set value, and can be set to be 0.5 ℃/min for example;
2.5, conditions 2.3 and 2.4 are satisfied for e minutes, where e is a preset time setting, which may be set to 5 minutes, for example.
By the scheme, frequent loading of the water chilling unit can be avoided, when various conditions are met, the condition shows that the currently operated unit reaches the optimal working state, the requirement of a user on cooling capacity cannot be met by increasing the load of the unit, and at the moment, one unit needs to be added.
In another embodiment, wherein determining that the air conditioning system operation satisfies the loading condition comprises:
if the operation of the air conditioning system meets the following four conditions, judging that the loading condition is met:
3.1, the running time of the previous unit is more than or equal to f, wherein f is preset starting loading time and can be set to 30 minutes, for example;
3.2, the number of available water paths is more than or equal to (the number of running water chilling units + g), wherein g is a preset revision value, and can be set to be 1, for example;
3.3, the water supply temperature of the freezing main pipe is > (h + i), wherein h is a preset water outlet temperature set value of the freezing main pipe, and can be set to be 5 for example; i is a preset deviation value, which can be set to 1, for example;
3.4, condition 3.3 is satisfied for j minutes, where j is a preset time setting, which may be set to 1 minute, for example.
Similarly, frequent loading of the water chilling unit can be avoided through the scheme, and when various conditions of the scheme are met, the water supply temperature of the freezing main pipe cannot be reduced, the refrigerating capacity cannot meet the requirements of users, and at the moment, one unit needs to be added.
The two embodiments load the condition, and the relationship of 'or' between them meets any condition, and load immediately.
In one embodiment, wherein the selecting of the non-operating chiller and its channel devices according to the first control strategy comprises:
and when the loading condition is met, selecting an un-operated water chilling unit, an un-operated cooling water pump, an un-operated refrigerating water pump and an un-operated cooling tower in the air conditioning system according to a first selection strategy.
Specifically, the first control strategy may include a first selection strategy, which is used to select the chiller and the channel device thereof when the loading condition is met. In practical applications, the first selection policy may be any selection policy, and the like. In view of ensuring that the running times of the devices in the air conditioning system are balanced as much as possible, in an embodiment of the present application, the first selection policy includes: and (4) minimum operation time strategy, namely, preferentially opening the channel equipment with minimum operation time.
In one embodiment, the controlling, according to the first control policy, the starting of the selected non-operating channel device, and then issuing the start instruction to the selected non-operating chiller, includes:
starting the selected cooling water pump, and keeping the frequency of the selected cooling water pump consistent with the frequency of the operated cooling water pump;
when the selected cooling water pump operates for a first preset time (such as 30 seconds), opening a cooling side electric butterfly valve of the selected water chilling unit and an electric butterfly valve of the selected cooling tower;
when the electric butterfly valve at the cooling side of the selected water chilling unit and the electric butterfly valve of the selected cooling tower are opened in place, the selected chilled water pump is started, and the frequency of the chilled water pump is consistent with the frequency of the running chilled water pump;
when the selected chilled water pump operates for a second preset time (such as 30 seconds), opening a chilled side electric butterfly valve of the selected water chilling unit;
when the electric butterfly valve at the freezing side of the selected water chilling unit is opened in place, whether the running number of the freezing water pump and the cooling water pump in the air conditioning system is consistent with the number of the channels of the started water chilling unit is judged, and if so, a starting instruction is issued to the selected water chilling unit which is not running.
The control of opening in advance of the cooling side electric butterfly valve and the freezing side electric butterfly valve of cooling water pump, cooling water set, the electric butterfly valve of cooling tower and the freezing water pump shown through the scheme is helpful to ensure the stable opening and operation of the cooling water set, can make the air conditioning system stably operate under the condition of loading the cooling water set, and ensures the refrigeration stability.
In one embodiment, wherein determining that the air conditioning system operation satisfies the load shedding condition comprises:
if the operation of the air conditioning system meets the following three conditions, judging that the load shedding condition is met:
7.1, the running time of the previous unit is more than or equal to k, wherein k is the load shedding interval time of the preset unit, and can be set to 30 minutes for example;
7.2, the average load of the started units corresponding to the currently-operated water chilling unit is less than the preset load reducing set value corresponding to the currently-operated water chilling unit, wherein the preset load reducing set value corresponding to the currently-operated water chilling unit and the number of the currently-operated water chilling units have a preset corresponding relation; specifically, for example, when the number of the operating units is 3, the average load of the started units is less than 3 minus load set values (which may be 45% of the maximum load); when the number of the running units is 2, the average load of the started units is less than 2 minus machine load set values (which can be 45 percent of the maximum load).
7.3, condition 7.2 is satisfied for consecutive l minutes, where l is a preset time set value and l can be set to 5 minutes.
By the scheme, frequent load shedding of the water chilling unit can be avoided, when all conditions of the scheme are met, the fact that the refrigerating capacity of the currently operated unit is enough is shown, a plurality of units are in low-load operation but not energy-saving is shown, and one unit can be reduced.
In another embodiment, wherein determining that the air conditioning system operation satisfies the load shedding condition comprises:
if the operation of the air conditioning system meets the following three conditions, judging that the load shedding condition is met:
8.1, the running time of the previous unit is more than or equal to m, wherein m is the preset starting deloading time;
8.2, the outlet water temperature of the freezing main pipe is less than (n-p), wherein n is the outlet water temperature set value of the freezing main pipe; p is a deviation set value and can be set to be 1;
8.3, the condition 8.2 is satisfied for q minutes continuously, wherein q is a preset time set value and can be set to 1 minute.
Similarly, the frequent load shedding of the water chilling unit can be avoided through the scheme, and when various conditions of the scheme are met, the fact that the water supply temperature of the freezing main pipe is low enough at the moment and the refrigerating capacity exceeds the requirement can be shown, so that one unit can be reduced.
The two embodiments of the load shedding conditions have an OR relationship between the two embodiments, and load shedding is immediately carried out when either condition is met.
In one embodiment, wherein the selecting of the running chiller and the channel equipment thereof according to the second control strategy comprises:
and when the load shedding condition is met, selecting an operated water chilling unit, an operated cooling water pump, an operated refrigerating water pump and an operated cooling tower in the air conditioning system according to a second selection strategy.
Further, the second selection policy includes: a maximum run time policy.
Specifically, the second control strategy may include a second selection strategy, which is used to select the chiller and the passage device thereof when the load shedding condition is met. In practical applications, the second selection policy may be any selection policy, etc. In view of ensuring that the running times of the devices in the air conditioning system are balanced as much as possible, in an embodiment of the present application, the second selection strategy includes: and (4) a maximum operation time strategy, namely, preferentially opening the channel equipment with the maximum operation time.
In one embodiment, issuing a shutdown instruction to the selected running chiller according to the second control strategy, and then performing shutdown control on the selected running channel device includes:
sending a shutdown instruction to the selected water chilling unit;
starting timing after the selected water chilling unit is stopped, and closing the cooling side electric butterfly valve of the selected water chilling unit and the electric butterfly valve of the selected cooling tower when the timing time reaches a third preset time (which can be set to 300 seconds);
when the electric butterfly valve at the cooling side of the selected water chilling unit and the electric butterfly valve of the selected cooling tower are closed in place, closing the selected cooling water pump;
when the selected cooling water pump is turned off for a fourth preset time (which can be set to 60 seconds), closing the electric butterfly valve at the freezing side of the selected water chilling unit;
and when the electric butterfly valve at the freezing side of the selected water chilling unit is closed in place, closing the selected freezing water pump.
Similarly, after the selected water chilling unit is closed, the cooling water pump, the cooling side electric butterfly valve and the freezing side electric butterfly valve of the water chilling unit, the electric butterfly valve of the cooling tower and the freezing water pump are controlled to be closed optimally, so that stable load shedding operation of the water chilling unit is guaranteed, an air conditioning system can operate stably under the condition of the load shedding water chilling unit, and refrigeration stability is guaranteed.
Referring to fig. 2, fig. 2 is a schematic structural diagram illustrating an operation control device for a chiller of an air conditioning system according to an exemplary embodiment, and as shown in fig. 2, the operation control device 2 for a chiller of an air conditioning system includes:
the judging module 201 is used for judging whether the operation of the air conditioning system meets a preset loading condition or a preset load shedding condition;
the load adding and reducing module 202 is configured to select, according to a first control policy, a non-operating chiller unit and channel equipment thereof, perform start control on the selected non-operating channel equipment, and then issue a start instruction to the selected non-operating chiller unit if the load adding condition is met; and if the load shedding condition is met, selecting the running water chilling unit and the channel equipment thereof according to a second control strategy, sending a shutdown instruction to the selected running water chilling unit, and then closing and controlling the selected running channel equipment.
Further, the judging that the operation of the air conditioning system meets the loading condition comprises:
if the operation of the air conditioning system meets the following five conditions, judging that the loading condition is met:
2.1, the running time of the previous unit is more than or equal to a, wherein a is the loading interval time of the preset unit;
2.2, the number of the water paths which can be used is more than or equal to (the number of the running water chilling unit + b), wherein b is a preset revision value;
2.3, the average load of the started unit is more than c, wherein c is a preset engine adding load set value;
2.4, the return water temperature drop rate of the freezing main pipe is less than d, wherein d is a preset drop rate set value;
2.5, conditions 2.3 and 2.4 are met for e minutes, where e is a preset time set value.
Further, the judging that the operation of the air conditioning system meets the loading condition comprises:
if the operation of the air conditioning system meets the following four conditions, judging that the loading condition is met:
3.1, the running time of the previous unit is more than or equal to f, wherein f is the preset starting loading time;
3.2, the number of the water paths which can be used is more than or equal to (the number of the running water chilling unit + g), wherein g is a preset revision value;
3.3, the water supply temperature of the freezing main pipe is > (h + i), wherein h is a preset water outlet temperature set value of the freezing main pipe, and i is a preset deviation value;
3.4, condition 3.3 is satisfied for j minutes, where j is a preset time set value.
Further, the step of selecting the water chilling unit which does not operate and the channel equipment thereof according to the first control strategy comprises the following steps:
and when the loading condition is met, selecting an un-operated water chilling unit, an un-operated cooling water pump, an un-operated refrigerating water pump and an un-operated cooling tower in the air conditioning system according to a first selection strategy.
Further, the first selection policy includes: a minimum run-time policy.
Further, the controlling, according to the first control strategy, the starting of the selected non-operating channel device, and then issuing the starting instruction to the selected non-operating chiller unit includes:
starting the selected cooling water pump, and keeping the frequency of the selected cooling water pump consistent with the frequency of the operated cooling water pump;
when the selected cooling water pump runs for a first preset time length, opening a cooling side electric butterfly valve of the selected water chilling unit and an electric butterfly valve of the selected cooling tower;
when the electric butterfly valve at the cooling side of the selected water chilling unit and the electric butterfly valve of the selected cooling tower are opened in place, the selected chilled water pump is started, and the frequency of the chilled water pump is consistent with the frequency of the running chilled water pump;
when the selected chilled water pump operates for a second preset time length, opening a chilled side electric butterfly valve of the selected water chilling unit;
when the electric butterfly valve at the freezing side of the selected water chilling unit is opened in place, whether the running number of the freezing water pump and the cooling water pump in the air conditioning system is consistent with the number of the channels of the started water chilling unit is judged, and if so, a starting instruction is issued to the selected water chilling unit which is not running.
Further, the judging that the operation of the air conditioning system meets the load shedding condition comprises the following steps:
if the operation of the air conditioning system meets the following three conditions, judging that the load shedding condition is met:
7.1, the running time of the previous unit is more than or equal to k, wherein k is the load shedding interval time of the preset unit;
7.2, the average load of the started units corresponding to the currently-operated water chilling unit is less than the preset load reducing set value corresponding to the currently-operated water chilling unit, wherein the preset load reducing set value corresponding to the currently-operated water chilling unit and the number of the currently-operated water chilling units have a preset corresponding relation;
7.3, the condition 7.2 is met for continuous l minutes, wherein l is a preset time set value.
Further, the judging that the operation of the air conditioning system meets the load shedding condition comprises the following steps:
if the operation of the air conditioning system meets the following three conditions, judging that the load shedding condition is met:
8.1, the running time of the previous unit is more than or equal to m, wherein m is the preset starting deloading time;
8.2, the outlet water temperature of the freezing main pipe is less than (n-p), wherein n is the outlet water temperature set value of the freezing main pipe, and p is the difference set value;
8.3, the condition 8.2 is met for continuous q minutes, wherein q is a preset time set value.
Further, the selecting the running water chilling unit and the channel equipment thereof according to the second control strategy comprises:
and when the load shedding condition is met, selecting an operated water chilling unit, an operated cooling water pump, an operated refrigerating water pump and an operated cooling tower in the air conditioning system according to a second selection strategy.
Further, the second selection policy includes: a maximum run time policy.
Further, wherein, according to the second control strategy, issuing a shutdown instruction to the selected running water chilling unit, and then performing shutdown control on the selected running channel device includes:
sending a shutdown instruction to the selected water chilling unit;
starting timing after the selected water chilling unit stops, and closing the electric butterfly valve at the cooling side of the selected water chilling unit and the electric butterfly valve of the selected cooling tower when the timing time reaches a third preset time;
when the electric butterfly valve at the cooling side of the selected water chilling unit and the electric butterfly valve of the selected cooling tower are closed in place, closing the selected cooling water pump;
when the selected cooling water pump is closed to reach a fourth preset time length, closing the electric butterfly valve at the freezing side of the selected water chilling unit;
and when the electric butterfly valve at the freezing side of the selected water chilling unit is closed in place, closing the selected freezing water pump.
With regard to the operation control device of the air conditioning system water chilling unit in the above embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be described in detail here.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an air conditioning system according to an exemplary embodiment, and as shown in fig. 3, the air conditioning system 3 includes:
one or more memories 301 having executable programs stored thereon;
one or more processors 302 for executing the executable programs in the memory 301 to implement the steps of any of the methods described above.
Specifically, the air conditioning system may be a central air conditioning system having a plurality of chiller units, a cooling tower, a cooling water pump, and a chilled water pump.
With respect to the air conditioning system 3 in the above embodiment, the specific manner of executing the program in the memory 301 by the processor 302 thereof has been described in detail in the embodiment related to the method, and will not be elaborated herein.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, the meaning of "plurality" means at least two unless otherwise specified.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, and further, as used herein, connected may include wirelessly connected; the term "and/or" is used to include any and all combinations of one or more of the associated listed items.
Any process or method descriptions in flow charts or otherwise described herein may be understood as: represents modules, segments or portions of code which include one or more executable instructions for implementing specific logical functions or steps of a process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (13)
1. An operation control method for a water chilling unit of an air conditioning system is characterized by comprising the following steps:
judging whether the operation of the air conditioning system meets a preset loading condition or a preset unloading condition;
if the loading condition is met, selecting the non-operated water chilling unit and the channel equipment thereof according to a first control strategy, carrying out starting control on the selected non-operated channel equipment, and then issuing a starting instruction to the selected non-operated water chilling unit; and if the load shedding condition is met, selecting the running water chilling unit and the channel equipment thereof according to a second control strategy, sending a shutdown instruction to the selected running water chilling unit, and then closing and controlling the selected running channel equipment.
2. The method of claim 1, wherein determining that air conditioning system operation satisfies the loading condition comprises:
if the operation of the air conditioning system meets the following five conditions, judging that the loading condition is met:
2.1, the running time of the previous unit is more than or equal to a, wherein a is the loading interval time of the preset unit;
2.2, the number of the water paths which can be used is more than or equal to (the number of the running water chilling unit + b), wherein b is a preset revision value;
2.3, the average load of the started unit is more than c, wherein c is a preset engine adding load set value;
2.4, the return water temperature drop rate of the freezing main pipe is less than d, wherein d is a preset drop rate set value;
2.5, conditions 2.3 and 2.4 are met for e minutes, where e is a preset time set value.
3. The method of claim 1, wherein determining that air conditioning system operation satisfies the loading condition comprises:
if the operation of the air conditioning system meets the following four conditions, judging that the loading condition is met:
3.1, the running time of the previous unit is more than or equal to f, wherein f is the preset starting loading time;
3.2, the number of the water paths which can be used is more than or equal to (the number of the running water chilling unit + g), wherein g is a preset revision value;
3.3, the water supply temperature of the freezing main pipe is > (h + i), wherein h is a preset water outlet temperature set value of the freezing main pipe, and i is a preset deviation value;
3.4, condition 3.3 is satisfied for j minutes, where j is a preset time set value.
4. The method of claim 1, wherein selecting a non-operational chiller and its channeling equipment according to the first control strategy comprises:
and when the loading condition is met, selecting an un-operated water chilling unit, an un-operated cooling water pump, an un-operated refrigerating water pump and an un-operated cooling tower in the air conditioning system according to a first selection strategy.
5. The method of claim 4, wherein the first selection policy comprises: a minimum run-time policy.
6. The method according to claim 4 or 5, wherein the step of controlling the selected non-operating channel device to be turned on according to the first control strategy and then issuing a power-on command to the selected non-operating chiller group comprises:
starting the selected cooling water pump, and keeping the frequency of the selected cooling water pump consistent with the frequency of the operated cooling water pump;
when the selected cooling water pump runs for a first preset time length, opening a cooling side electric butterfly valve of the selected water chilling unit and an electric butterfly valve of the selected cooling tower;
when the electric butterfly valve at the cooling side of the selected water chilling unit and the electric butterfly valve of the selected cooling tower are opened in place, the selected chilled water pump is started, and the frequency of the chilled water pump is consistent with the frequency of the running chilled water pump;
when the selected chilled water pump operates for a second preset time length, opening a chilled side electric butterfly valve of the selected water chilling unit;
when the electric butterfly valve at the freezing side of the selected water chilling unit is opened in place, whether the running number of the freezing water pump and the cooling water pump in the air conditioning system is consistent with the number of the channels of the started water chilling unit is judged, and if so, a starting instruction is issued to the selected water chilling unit which is not running.
7. The method of claim 1, wherein determining that air conditioning system operation satisfies the load shedding condition comprises:
if the operation of the air conditioning system meets the following three conditions, judging that the load shedding condition is met:
7.1, the running time of the previous unit is more than or equal to k, wherein k is the load shedding interval time of the preset unit;
7.2, the average load of the started units corresponding to the currently-operated water chilling unit is less than the preset load reducing set value corresponding to the currently-operated water chilling unit, wherein the preset load reducing set value corresponding to the currently-operated water chilling unit and the number of the currently-operated water chilling units have a preset corresponding relation;
7.3, the condition 7.2 is met for continuous l minutes, wherein l is a preset time set value.
8. The method of claim 1, wherein determining that air conditioning system operation satisfies the load shedding condition comprises:
if the operation of the air conditioning system meets the following three conditions, judging that the load shedding condition is met:
8.1, the running time of the previous unit is more than or equal to m, wherein m is the preset starting deloading time;
8.2, the outlet water temperature of the freezing main pipe is less than (n-p), wherein n is the outlet water temperature set value of the freezing main pipe, and p is the difference set value;
8.3, the condition 8.2 is met for continuous q minutes, wherein q is a preset time set value.
9. The method of claim 1, wherein selecting an operating chiller and its plumbing according to the second control strategy comprises:
and when the load shedding condition is met, selecting an operated water chilling unit, an operated cooling water pump, an operated refrigerating water pump and an operated cooling tower in the air conditioning system according to a second selection strategy.
10. The method of claim 9, wherein the second selection policy comprises: a maximum run time policy.
11. The method according to claim 9 or 10, wherein issuing a shutdown instruction to the selected running chiller according to the second control strategy and then performing shutdown control on the selected running channel device comprises:
sending a shutdown instruction to the selected water chilling unit;
starting timing after the selected water chilling unit stops, and closing the electric butterfly valve at the cooling side of the selected water chilling unit and the electric butterfly valve of the selected cooling tower when the timing time reaches a third preset time;
when the electric butterfly valve at the cooling side of the selected water chilling unit and the electric butterfly valve of the selected cooling tower are closed in place, closing the selected cooling water pump;
when the selected cooling water pump is closed to reach a fourth preset time length, closing the electric butterfly valve at the freezing side of the selected water chilling unit;
and when the electric butterfly valve at the freezing side of the selected water chilling unit is closed in place, closing the selected freezing water pump.
12. An operation control device for a water chilling unit of an air conditioning system is characterized by comprising:
the judging module is used for judging whether the operation of the air conditioning system meets a preset loading condition or a preset load shedding condition;
the loading and unloading module is used for selecting the non-operated water chilling unit and the channel equipment thereof according to a first control strategy if the loading condition is met, carrying out starting control on the selected non-operated channel equipment and then issuing a starting instruction to the selected non-operated water chilling unit; and if the load shedding condition is met, selecting the running water chilling unit and the channel equipment thereof according to a second control strategy, sending a shutdown instruction to the selected running water chilling unit, and then closing and controlling the selected running channel equipment.
13. An air conditioning system, comprising:
one or more memories having executable programs stored thereon;
one or more processors configured to execute the executable program in the memory to implement the steps of the method of any one of claims 1-11.
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