CN113739463A - Control method and device for refrigerating unit and refrigerating equipment - Google Patents
Control method and device for refrigerating unit and refrigerating equipment Download PDFInfo
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- CN113739463A CN113739463A CN202110952878.5A CN202110952878A CN113739463A CN 113739463 A CN113739463 A CN 113739463A CN 202110952878 A CN202110952878 A CN 202110952878A CN 113739463 A CN113739463 A CN 113739463A
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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
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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 a method and a device for controlling a refrigerating unit and refrigerating equipment. This application can realize the matching control that becomes more meticulous of equipment such as water pump and cold machine through the accumulator liquid level change, guarantees the stability of water supply temperature, water supply pressure, realizes high-efficient stable operation, the energy-conserving operation of system.
Description
Technical Field
The application belongs to the technical field of control of refrigerating units, and particularly relates to a control method and device of a refrigerating unit and refrigeration equipment.
Background
The industrial cold machine room needs to guarantee the stability of water supply temperature and water supply pressure, but the water consumption of industrial project is big in the actual operation, the load fluctuation is big, and one cold machine set can not satisfy the demand of refrigeration load usually, need adopt two or many cold machine set design, and the control of traditional cold machine set adopts the manual control mode, according to fortune dimension personnel's own experience, the machine that adds of manual accuse cold machine, and this kind of mode easily causes the energy extravagant. In the related technology, the automatic switching of the refrigerator is realized by adopting a method of the return water temperature of the refrigerator unit, and when the return water temperature of the refrigerator unit exceeds a set value, a control system can increase one refrigerator; when the return water temperature is lower than a certain set value, the cooling machine set can automatically reduce one cooling machine. However, the delay of the starting process of the cold machine can cause large fluctuation of water supply temperature and unstable water supply pressure, which affects the operation stability of the cold machine set and can not meet the process requirements.
Disclosure of Invention
In order to overcome the problems that the fluctuation of water supply temperature is large, the water supply pressure is unstable, the operation stability of the refrigerating unit is influenced and the process requirements cannot be met when a backwater temperature control refrigerating unit is adopted in the related technology at least to a certain extent, the application provides a control method and a control device of the refrigerating unit and refrigerating equipment.
In a first aspect, the present application provides a method for controlling a chiller unit, including:
acquiring the actual liquid level of the water storage tank;
comparing the actual liquid level of the water storage tank with a preset control liquid level;
and controlling the refrigerating machine set to execute a corresponding refrigerating machine control strategy according to the comparison result.
Further, the controlling the refrigerating unit to execute the corresponding refrigerating machine control strategy according to the comparison result includes:
if the actual liquid level of the water storage tank is greater than the first control liquid level, executing a first refrigerator control strategy;
if the actual liquid level of the water storage tank is greater than the second control liquid level and less than or equal to the first control liquid level, executing a second refrigerator control strategy;
if the actual liquid level of the water storage tank is less than or equal to the second control liquid level, executing a third refrigerator control strategy;
wherein the first control level is higher than the second control level.
Further, the method also comprises the following steps:
acquiring operation parameters of the refrigerating unit, wherein the operation parameters of the refrigerating unit comprise one or more of internal circulation flow, external circulation flow, circulating pump frequency and average load of the refrigerating unit;
and executing a corresponding refrigerator control strategy according to the comparison result and the refrigerator unit operation parameter control refrigerator unit.
Further, the executing the first chiller control strategy includes:
judging whether the actual liquid level of the water storage tank is greater than a third control liquid level or not;
if yes, executing a first branch strategy of a first refrigerator control strategy according to the operation parameters of the refrigerator set;
otherwise, when the actual liquid level of the water storage tank is greater than the fourth control liquid level and less than or equal to the third control liquid level, executing a second branch strategy of the first refrigerator control strategy according to the operation parameters of the refrigerator unit;
wherein the third control level is greater than the fourth control level, which is greater than the first control level.
Further, the executing a first branch strategy of a first chiller control strategy according to the operating parameters of the chiller unit includes:
when the internal circulation flow is greater than the external circulation flow by a first preset flow proportion threshold value and the internal and external circulation flow difference is greater than a flow difference threshold value, judging whether the frequency of the circulation pump reaches a preset lower limit frequency or whether the average load of the refrigerator reaches a preset minimum load;
if yes, executing a control strategy of the refrigerator reducer;
otherwise, executing the internal circulation pump frequency reduction control strategy.
Further, the executing the second branch strategy of the first chiller control strategy according to the operating parameters of the chiller unit includes:
judging whether the internal circulation flow is smaller than the external circulation flow and whether the internal and external circulation flow difference is larger than a flow difference threshold or not;
and if so, executing an internal circulation pump frequency-increasing control strategy.
Further, the executing the second chiller control strategy includes:
judging whether the average load of the cold machine reaches a preset load set value;
if not, executing a full-frequency control strategy of the internal circulating pump;
and if so, executing a cold machine control strategy when the internal circulation flow is not more than the external circulation flow and a third preset flow proportion threshold.
Further, before executing the control strategy of the cold machine, the method further includes:
judging whether the number of running cold machines is equal to the total number of designed cold machines or not;
and if not, executing a control strategy of the cold machine.
Further, the executing the third cooling machine control strategy includes:
judging whether the external circulation flow is less than the rated flow of the cold machine or not and presetting a rated flow proportion value;
if yes, executing a first branch strategy of a third refrigerator control strategy according to the number of the running refrigerators;
otherwise, executing a second branch strategy of a third cold machine control strategy.
Further, the executing the first branch strategy of the third refrigerator control strategy according to the number of the running cold machines at present includes:
judging whether the number of running cold machines is less than the total number of designed cold machines or not and judging whether the total number of running cold machines is less than a preset number of cold machines proportional value or not;
if yes, executing a control strategy of the cold machine until the number of running cold machines is more than or equal to the total number of designed machines and a preset machine number proportion value;
and if not, executing a full-frequency control strategy of the internal circulation pump when the average load of the cold machine does not reach a preset load set value.
Further, the executing the second branch strategy of the third chiller control strategy includes:
judging whether the number of running cold machines is equal to the total number of designed cold machines or not;
if yes, executing a control strategy of the cold machine until all cold machines run;
otherwise, when the average load of the cold machine does not reach the preset load set value, executing the full-frequency control strategy of the internal circulation pump.
Further, the preset number ratio is 50%, and when the result obtained by the total design number multiplied by the preset number ratio is not an integer, the result is rounded upward so that the result obtained by the total design number multiplied by the preset number ratio is an integer.
Further, the flow difference threshold is 5m3/h。
In a second aspect, the present application provides a control apparatus for a chiller unit, comprising:
the acquisition module is used for acquiring the actual liquid level of the water storage tank;
the comparison module is used for comparing the actual liquid level of the water storage tank with a preset control liquid level;
and the execution module is used for controlling the refrigerating unit to execute the corresponding refrigerating machine control strategy according to the comparison result.
In a third aspect, the present application provides a refrigeration apparatus comprising:
a water storage tank, a plurality of internal circulating pumps, a plurality of external circulating pumps, a plurality of coolers and a cooler unit control device as described in the second aspect;
and the cold machine set control device is used for acquiring the actual liquid level of the water storage tank and controlling the operation of the plurality of internal circulating pumps, the plurality of external circulating pumps and the plurality of cold machines according to the actual liquid level of the water storage tank.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
according to the control method and device for the refrigerating unit and the refrigerating device provided by the embodiment of the invention, the actual liquid level of the water storage tank is obtained, the actual liquid level of the water storage tank is compared with the preset control liquid level, the refrigerating unit is controlled to execute the corresponding refrigerating machine control strategy according to the comparison result, the refined matching control of equipment such as a water pump and a refrigerating machine can be realized through the liquid level change of the water storage tank, the stability of water supply temperature and water supply pressure is ensured, and the efficient and stable operation and the energy-saving operation of a system are 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
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a flowchart of a method for controlling a chiller unit according to an embodiment of the present application.
Fig. 2 is a flowchart of a method for controlling a chiller unit according to another embodiment of the present application.
Fig. 3 is a flowchart of another cooling unit control method according to an embodiment of the present application.
Fig. 4 is a flowchart of another cooling unit control method according to an embodiment of the present application.
Fig. 5 is a flowchart of another cooling unit control method according to an embodiment of the present application.
Fig. 6 is a functional structure diagram of a cooling unit control device according to an embodiment of the present application.
Fig. 7 is a functional block diagram of a refrigeration apparatus according to an embodiment of the present application.
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.
Fig. 1 is a flowchart of a method for controlling a chiller unit according to an embodiment of the present application, and as shown in fig. 1, the method for controlling a chiller unit includes:
s11: acquiring the actual liquid level of the water storage tank;
s12: comparing the actual liquid level of the water storage tank with a preset control liquid level;
s13: and controlling the refrigerating machine set to execute a corresponding refrigerating machine control strategy according to the comparison result.
The traditional method for controlling the refrigerating unit adopts a method of the return water temperature of the refrigerating unit to realize automatic switching of the refrigerating unit, and when the return water temperature of the refrigerating unit exceeds a set value, a control system can increase one refrigerating unit; when the return water temperature is lower than a certain set value, the cooling machine set can automatically reduce one cooling machine. However, the delay of the starting process of the cold machine can cause large fluctuation of water supply temperature and unstable water supply pressure, which affects the operation stability of the cold machine set and can not meet the process requirements.
Because the inner side of the water storage tank is used for storing cold water for the cold machine and the outer side is used for supplying cold water for the tail end of the water storage tank, the water quantity of the water storage tank is guaranteed to be a key factor for meeting the stable operation of the system.
And the actual liquid level of the water storage tank is compared with the preset control liquid level, and the refrigerating unit is controlled to execute a corresponding refrigerating machine control strategy according to the comparison result, so that the water quantity of the water storage tank can be ensured.
In the embodiment, the control method of the refrigerating unit comprises the steps of obtaining the actual liquid level of the water storage tank, comparing the actual liquid level of the water storage tank with the preset control liquid level, controlling the refrigerating unit to execute the corresponding refrigerating unit control strategy according to the comparison result, realizing fine matching control of equipment such as a water pump and a refrigerating unit through the liquid level change of the water storage tank, ensuring the stability of water supply temperature and water supply pressure, and realizing efficient and stable operation and energy-saving operation of the system.
An embodiment of the present invention provides another method for controlling a chiller unit, where as shown in a flowchart in fig. 2, the method for controlling a chiller unit includes:
s21: acquiring the actual liquid level of the water storage tank;
s22: comparing the actual liquid level of the water storage tank with a preset control liquid level;
s23: if the actual liquid level of the water storage tank is greater than the first control liquid level, executing a first refrigerator control strategy;
s24: if the actual liquid level of the water storage tank is greater than the second control liquid level and less than or equal to the first control liquid level, executing a second refrigerator control strategy;
s25: if the actual liquid level of the water storage tank is less than or equal to the second control liquid level, executing a third refrigerator control strategy;
wherein the first control level is higher than the second control level. The first control level is, for example, 70% of the full level of the reservoir; the second control level is, for example, 50% full level of the reservoir.
In some embodiments, the method for controlling a chiller unit further includes:
obtaining operation parameters of the refrigerating unit, wherein the operation parameters of the refrigerating unit include but are not limited to internal circulation flow, external circulation flow, circulation pump frequency and average load of the refrigerating unit;
and executing a corresponding refrigerator control strategy according to the comparison result and the refrigerator unit operation parameter control refrigerator unit.
As shown in fig. 3, a first chiller control strategy is implemented, comprising:
s31: judging whether the actual liquid level of the water storage tank is greater than a third control liquid level or not;
s32: if yes, executing a first branch strategy of a first refrigerator control strategy according to the operation parameters of the refrigerator set;
in some embodiments, executing the first branch strategy of the first chiller control strategy according to the operating parameters of the chiller unit includes:
s321: when the internal circulation flow is greater than the external circulation flow by a first preset flow proportion threshold value and the internal and external circulation flow difference is greater than a flow difference threshold value, judging whether the frequency of the circulation pump reaches a preset lower limit frequency or whether the average load of the refrigerator reaches a preset minimum load;
in some embodiments, the first predetermined flow rate proportion threshold is, for example, 95%.
S322: if yes, executing a control strategy of the refrigerator reducer;
s323: otherwise, executing the internal circulation pump frequency reduction control strategy.
S33: otherwise, when the actual liquid level of the water storage tank is greater than the fourth control liquid level and less than or equal to the third control liquid level, executing a second branch strategy of the first refrigerator control strategy according to the operation parameters of the refrigerator unit;
wherein the third control level is greater than a fourth control level, the fourth control level being greater than the first control level. The third control level is, for example, 80% full of the reservoir and the fourth control level is, for example, 75% full of the reservoir.
In some embodiments, executing the second branch strategy of the first chiller control strategy according to the operating parameters of the chiller unit includes:
s331: judging whether the internal circulation flow is smaller than the external circulation flow and whether the internal and external circulation flow difference is larger than a flow difference threshold or not;
in some embodiments, the flow difference threshold is, for example, 5m3/h。
In some embodiments, the second predetermined flow rate proportion threshold is, for example, 95%.
S332: and if so, executing an internal circulation pump frequency-increasing control strategy.
As shown in fig. 4, a second chiller control strategy is implemented, comprising:
s41: judging whether the average load of the cold machine reaches a preset machine loading set value or not;
s42: if not, executing a full-frequency control strategy of the internal circulating pump;
s43: if yes, judging whether the internal circulation flow is larger than the external circulation flow and a third preset flow proportion threshold;
when the internal circulation flow is larger than the external circulation flow and the third preset flow, the flow of the internal circulation is larger than the external circulation flow, at the moment, the cold supply of the internal circulation cold machine not only meets the cold using requirement of the external circulation, but also stores water into the water storage tank, and at the moment, the system keeps the state to continue to operate.
In some embodiments, the third predetermined flow rate proportion threshold is 105%.
Through setting up first preset flow proportion threshold value, second preset flow proportion threshold value and third preset flow proportion threshold value, can prevent the frequent plus-minus machine of water pump, cause the system unstable.
S44: when the internal circulation flow is not greater than the external circulation flow and a third preset flow proportion threshold, judging whether the number of running cold machines is equal to the total number of designed cold machines or not;
s45: and if not, executing a control strategy of the cold machine.
As shown in fig. 5, a third chiller control strategy is implemented, comprising:
s51: judging whether the external circulation flow is less than the rated flow of the cold machine or not and presetting a rated flow proportion value;
in some embodiments, the predetermined rated flow rate ratio value is, for example, 35%.
S52: if yes, executing a first branch strategy of a third refrigerator control strategy according to the number of the running refrigerators;
in some embodiments, executing the first branch strategy of the third refrigerator control strategy according to the current number of running refrigerators includes:
s521: judging whether the number of running cold machines is less than the total number of designed cold machines or not and judging whether the total number of running cold machines is less than a preset number of cold machines proportional value or not;
in some embodiments, the predetermined ratio of the number of stages is 50%, and when the result obtained by the total number of design stages by the predetermined ratio of the number of stages is not an integer, the result is rounded up so that the result obtained by the total number of design stages by the predetermined ratio of the number of stages is an integer.
Judging whether the number of running cold machines is less than the total design number of running cold machines or not and a preset number proportion value, and realizing flow staged economic control, namely when the water outlet flow of the water storage tank is small, adopting a part of cold machines to store water for the water storage tank; when the water outlet flow of the water storage tank is large, the water storage tank is stored by adopting full-load operation of all the cold machines.
S522: if yes, executing a control strategy of the cold machine until the number of running cold machines is more than or equal to the total number of designed machines and a preset machine number proportion value;
s523: if not, when the average load of the cold machine does not reach the preset load set value, executing the full-frequency control strategy of the internal circulation pump.
S53: otherwise, executing a second branch strategy of a third cold machine control strategy.
In some embodiments, executing the third chiller control strategy and the second branch strategy includes:
s531: judging whether the number of running cold machines is equal to the total number of designed cold machines or not;
s532: if yes, executing a control strategy of the cold machine until all cold machines run;
s533: otherwise, the above step S523 is executed.
The overall framework of cold machine set control includes:
1) when the actual liquid level H of the water storage tank is greater than the control liquid level H1 (the default is H)Design of water storage tank70%), control strategy 1 is executed, otherwise, step 2) is executed;
2) when the actual liquid level H of the water storage tank is greater than the control liquid level H2 (the default is H)Design of water storage tank50%), control strategy 2 is executed, otherwise, control strategy 3 is executed;
control strategy 1:
1) when the actual liquid level H of the water storage tank is greater than the control liquid level H11(optionally, default is HDesign of water storage tank80%), the storage capacity of the water storage tank is larger than the required storage capacity, and at the moment, the step 2) is executed; otherwise, executing step 4);
2) judging the internal circulation flow QInner partWhether or not it is larger than the external circulation flow QOuter coverThreshold value P11(optionally, the default is 95%), and the difference Δ Q between the internal circulation flow and the external circulation flow is larger than the threshold Δ Qs(optionally, default to 5m3H), executing the step 3), otherwise, directly ending;
3) and judging whether the frequency of the circulating pump reaches the lower limit frequency or the average load of the cold machine is enough to reach the minimum load, if so, executing a control strategy of the reduction machine of the cold machine, and otherwise, executing a control strategy of the reduction frequency of the internal circulating pump.
4) When the liquid level H of the water storage tank is greater than the control liquid level H12(optionally, default is H Design of water storage tank75%), directly ending, otherwise, executing step 5);
5) judging the internal circulation flow QInner partWhether or not it is less than the external circulation flow QOuter coverThreshold value P12(optionally, the default is 95%), and the difference Δ Q between the internal circulation flow and the external circulation flow is larger than the threshold Δ Qs(optionally, default to 5m3H), executing an internal circulation pump frequency-increasing control strategy, otherwise, directly ending;
control strategy 2:
1) judging whether the average load of the cold machine reaches a set value of the load of the cold machine, if not, executing a full-frequency control strategy of the internal circulating pump, and enabling the internal circulating pump to run in a full screen; otherwise, executing the step 2);
2) judging the internal circulation flow QInner partWhether or not it is larger than the external circulation flow QOuter coverThreshold value P21(optionally, the default is 105%), if yes, the process is finished directly; otherwise, executing step 3);
3) judging whether the number of running cold machines is equal to the number of designed cold machines or not, and if not, executing a cold machine control strategy; otherwise, the process is ended directly.
Control strategy 3:
1) judging the external circulation flow QOuter coverWhether or not less than (rated flow Q of cold machine)Refrigerator eQ%) (q is a settable value, default is 35), if yes, step 2 is executed); otherwise, executing the step 4);
2) judging whether the number of running cold machines is less than (design number n%) (if not, rounding up, n is an adjustable value, default is 50), if yes, executing a control strategy of the cold machine until the number of running cold machines is more than or equal to (design number n%); if not, executing the step 3);
3) judging whether the average load of the cold machine reaches the load of the cold machine, if so, directly ending; otherwise, executing the full-frequency control strategy of the internal circulation pump until the internal circulation pump reaches the full frequency.
Judging whether the number of running cold machines is equal to the designed number, if so, executing a cold machine control strategy until all the cold machines run; otherwise, step 3) is performed.
In this embodiment, according to the step change of retaining jar liquid level, realize the accurate matching control of cold station equipment, not only guarantee system steady operation, can also reach energy-conserving purpose.
An embodiment of the present invention provides a control device for a chiller unit, as shown in a functional structure diagram of fig. 6, where the control device for a chiller unit includes:
the acquisition module 61 is used for acquiring the actual liquid level of the water storage tank;
the comparison module 62 is used for comparing the actual liquid level of the water storage tank with a preset control liquid level;
and the executing module 63 is used for controlling the refrigerating unit to execute the corresponding refrigerating machine control strategy according to the comparison result.
In some embodiments, execution module 63 includes
The first execution unit is used for executing a first refrigerator control strategy when the actual liquid level of the water storage tank is greater than the first control liquid level;
the second execution unit is used for executing a second refrigerator control strategy when the actual liquid level of the water storage tank is greater than the second control liquid level and is less than or equal to the first control liquid level;
the third execution unit is used for executing a third refrigerator control strategy when the actual liquid level of the water storage tank is less than or equal to the second control liquid level;
wherein the first control level is higher than the second control level.
In some embodiments, the obtaining module 61 is further configured to obtain a chiller operating parameter, which includes but is not limited to one or more of an internal circulation flow rate, an external circulation flow rate, a circulation pump frequency, and a chiller average load.
In some embodiments, the first execution unit is configured to:
judging whether the actual liquid level of the water storage tank is greater than a third control liquid level or not;
if yes, executing a first branch strategy of a first refrigerator control strategy according to the operation parameters of the refrigerator set;
otherwise, when the actual liquid level of the water storage tank is greater than the fourth control liquid level and less than or equal to the third control liquid level, executing a second branch strategy of the first refrigerator control strategy according to the operation parameters of the refrigerator unit;
wherein the third control level is greater than the fourth control level, which is greater than the first control level.
Further, executing a first branch strategy of a first chiller control strategy according to the operating parameters of the chiller unit includes:
when the internal circulation flow is greater than the external circulation flow by a first preset flow proportion threshold value and the internal and external circulation flow difference is greater than a flow difference threshold value, judging whether the frequency of the circulation pump reaches a preset lower limit frequency or whether the average load of the refrigerator reaches a preset minimum load;
if yes, executing a control strategy of the refrigerator reducer;
otherwise, executing the internal circulation pump frequency reduction control strategy.
Further, executing a second branch strategy of the first chiller control strategy according to the operation parameters of the chiller unit comprises:
judging whether the internal circulation flow is smaller than the external circulation flow and whether the internal and external circulation flow difference is larger than a flow difference threshold or not;
and if so, executing an internal circulation pump frequency-increasing control strategy.
In some embodiments, the second execution unit is configured to:
executing a second chiller control strategy comprising:
judging whether the average load of the cold machine reaches a preset load set value;
if not, executing a full-frequency control strategy of the internal circulating pump;
and if so, executing a cold machine control strategy when the internal circulation flow is not more than the external circulation flow and a third preset flow proportion threshold.
Further, before executing the control strategy of the cold machine, the method further includes:
judging whether the number of running cold machines is equal to the total number of designed cold machines or not;
and if not, executing a control strategy of the cold machine.
In some embodiments, the third execution unit is configured to:
executing a third chiller control strategy comprising:
judging whether the external circulation flow is less than the rated flow of the cold machine or not and presetting a rated flow proportion value;
if yes, executing a first branch strategy of a third refrigerator control strategy according to the number of the running refrigerators;
otherwise, executing a second branch strategy of a third cold machine control strategy.
Further, executing a first branch strategy of a third refrigerator control strategy according to the number of running cold machines at present, including:
judging whether the number of running cold machines is less than the total number of designed cold machines or not and judging whether the total number of running cold machines is less than a preset number of cold machines proportional value or not;
if yes, executing a control strategy of the cold machine until the number of running cold machines is more than or equal to the total number of designed machines and a preset machine number proportion value;
if not, when the average load of the cold machine does not reach the preset load set value, executing the full-frequency control strategy of the internal circulation pump.
Further, executing a second branch strategy of a third refrigerator control strategy, including:
judging whether the number of running cold machines is equal to the total number of designed cold machines or not;
if yes, executing a control strategy of the cold machine until all cold machines run;
otherwise, when the average load of the cold machine does not reach the preset load set value of the machine, executing the full-frequency control strategy of the internal circulation pump.
In this embodiment, acquire the actual liquid level of water storage tank through acquireing the module, the comparison module compares the actual liquid level of water storage tank with predetermineeing the control liquid level, and the execution module is according to the comparative result control refrigerating unit execution and is corresponding cold machine control strategy, can realize the matching control that becomes more meticulous of equipment such as water pump and cold machine through water storage tank liquid level change, guarantees the stability of water supply temperature, water supply pressure, realizes high-efficient stable operation, the energy-conserving operation of system.
An embodiment of the present invention provides a refrigeration apparatus, as shown in a functional structure diagram of fig. 7, the refrigeration apparatus includes:
a water storage tank 71, a plurality of internal circulation pumps 72, a plurality of external circulation pumps 73, a plurality of coolers 74 and a cooler unit control device (not shown) as described in the above embodiments;
the cold machine set control device is used for acquiring the actual liquid level of the water storage tank 71 and controlling the operation of the plurality of internal circulating pumps 72, the plurality of external circulating pumps 73 and the plurality of cold machines 74 according to the actual liquid level of the water storage tank 71.
In some embodiments, the refrigeration equipment further comprises a water separator 75, a water collector 76 and a water return pipe 77, the water storage tank 71, the plurality of internal circulation pumps 72 and the plurality of chillers 74 form an internal circulation path, the water storage tank 71, the water separator 75, the water collector 76 and the water return pipe 77 form an external circulation path, and the chiller unit control device controls the chiller units to execute corresponding chiller control strategies according to the actual liquid level of the water storage tank 71, the internal circulation flow, the external circulation flow, the frequency of the internal and external circulation pumps and the average load of the chiller.
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. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the 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 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.
It should be noted that the present invention is not limited to the above-mentioned preferred embodiments, and those skilled in the art can obtain other products in various forms without departing from the spirit of the present invention, but any changes in shape or structure can be made within the scope of the present invention with the same or similar technical solutions as those of the present invention.
Claims (14)
1. A control method for a refrigerating unit is characterized by comprising the following steps:
acquiring the actual liquid level of the water storage tank;
comparing the actual liquid level of the water storage tank with a preset control liquid level;
and controlling the refrigerating machine set to execute a corresponding refrigerating machine control strategy according to the comparison result.
2. The chiller unit control method according to claim 1, wherein the controlling the chiller unit to execute the corresponding chiller control strategy according to the comparison result comprises:
if the actual liquid level of the water storage tank is greater than the first control liquid level, executing a first refrigerator control strategy;
if the actual liquid level of the water storage tank is greater than the second control liquid level and less than or equal to the first control liquid level, executing a second refrigerator control strategy;
if the actual liquid level of the water storage tank is less than or equal to the second control liquid level, executing a third refrigerator control strategy;
wherein the first control level is higher than the second control level.
3. The control method for a chiller unit according to claim 2, further comprising:
acquiring operation parameters of the refrigerating unit, wherein the operation parameters of the refrigerating unit comprise one or more of internal circulation flow, external circulation flow, circulating pump frequency and average load of the refrigerating unit;
and executing a corresponding refrigerator control strategy according to the comparison result and the refrigerator unit operation parameter control refrigerator unit.
4. A chiller unit control method according to claim 3 wherein said executing a first chiller control strategy comprises:
judging whether the actual liquid level of the water storage tank is greater than a third control liquid level or not;
if yes, executing a first branch strategy of a first refrigerator control strategy according to the operation parameters of the refrigerator set;
otherwise, when the actual liquid level of the water storage tank is greater than the fourth control liquid level and less than or equal to the third control liquid level, executing a second branch strategy of the first refrigerator control strategy according to the operation parameters of the refrigerator unit;
wherein the third control level is greater than the fourth control level, which is greater than the first control level.
5. The chiller unit control method according to claim 4, wherein said executing a first branch strategy of a first chiller control strategy based on the chiller unit operating parameters comprises:
when the internal circulation flow is greater than the external circulation flow by a first preset flow proportion threshold value and the internal and external circulation flow difference is greater than a flow difference threshold value, judging whether the frequency of the circulation pump reaches a preset lower limit frequency or whether the average load of the refrigerator reaches a preset minimum load;
if yes, executing a control strategy of the refrigerator reducer;
otherwise, executing the internal circulation pump frequency reduction control strategy.
6. The chiller unit control method according to claim 4, wherein the executing the second branch strategy of the first chiller control strategy according to the chiller unit operating parameters comprises:
judging whether the internal circulation flow is smaller than the external circulation flow and whether the internal and external circulation flow difference is larger than a flow difference threshold or not;
and if so, executing an internal circulation pump frequency-increasing control strategy.
7. A chiller unit control method according to claim 3 characterised in that said executing a second chiller control strategy comprises:
judging whether the average load of the cold machine reaches a preset load set value;
if not, executing a full-frequency control strategy of the internal circulating pump;
and if so, executing a cold machine control strategy when the internal circulation flow is not more than the external circulation flow and a third preset flow proportion threshold.
8. The control method for the chiller unit according to claim 7, before executing the control strategy for the chiller unit, further comprising:
judging whether the number of running cold machines is equal to the total number of designed cold machines or not;
and if not, executing a control strategy of the cold machine.
9. A chiller unit control method according to claim 3 characterised in that said performing a third chiller control strategy comprises:
judging whether the external circulation flow is less than the rated flow of the cold machine or not and presetting a rated flow proportion value;
if yes, executing a first branch strategy of a third refrigerator control strategy according to the number of the running refrigerators;
otherwise, executing a second branch strategy of a third cold machine control strategy.
10. The method for controlling the chiller unit according to claim 9, wherein the executing the first branch strategy of the third chiller control strategy according to the current number of running chillers comprises:
judging whether the number of running cold machines is less than the total number of designed cold machines or not and judging whether the total number of running cold machines is less than a preset number of cold machines proportional value or not;
if yes, executing a control strategy of the cold machine until the number of running cold machines is more than or equal to the total number of designed machines and a preset machine number proportion value;
and if not, executing a full-frequency control strategy of the internal circulation pump when the average load of the cold machine does not reach a preset load set value.
11. The chiller unit control method according to claim 9, wherein said executing a third chiller control strategy second branch strategy comprises:
judging whether the number of running cold machines is equal to the total number of designed cold machines or not;
if yes, executing a control strategy of the cold machine until all cold machines run;
otherwise, when the average load of the cold machine does not reach the preset load set value, executing the full-frequency control strategy of the internal circulation pump.
12. The chiller unit control method according to claim 10, wherein the preset number ratio is 50%, and when the result obtained by the total design number by preset number ratio is not an integer, the result is rounded up so that the result obtained by the total design number by preset number ratio is an integer.
13. A control device for a chiller unit, comprising:
the acquisition module is used for acquiring the actual liquid level of the water storage tank;
the comparison module is used for comparing the actual liquid level of the water storage tank with a preset control liquid level;
and the execution module is used for controlling the refrigerating unit to execute the corresponding refrigerating machine control strategy according to the comparison result.
14. A refrigeration apparatus, comprising:
a reservoir tank, a plurality of internal circulation pumps, a plurality of external circulation pumps, a plurality of chillers and the chiller unit control apparatus of claim 13;
and the cold machine set control device is used for acquiring the actual liquid level of the water storage tank and controlling the operation of the plurality of internal circulating pumps, the plurality of external circulating pumps and the plurality of cold machines according to the actual liquid level of the water storage tank.
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