CN113803813A - A refrigeration system control method, device and refrigeration system - Google Patents
A refrigeration system control method, device and refrigeration system Download PDFInfo
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- CN113803813A CN113803813A CN202110970384.XA CN202110970384A CN113803813A CN 113803813 A CN113803813 A CN 113803813A CN 202110970384 A CN202110970384 A CN 202110970384A CN 113803813 A CN113803813 A CN 113803813A
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- 238000000034 method Methods 0.000 title claims abstract description 69
- 238000005057 refrigeration Methods 0.000 title 2
- 239000007788 liquid Substances 0.000 claims abstract description 85
- 238000012544 monitoring process Methods 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 130
- 238000004590 computer program Methods 0.000 claims description 12
- 238000004886 process control Methods 0.000 abstract description 7
- 238000007710 freezing Methods 0.000 description 12
- 230000008014 freezing Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid systems
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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
- F24F11/70—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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Air Conditioning Control Device (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
本发明公开一种冷机系统控制方法、装置及冷机系统。冷机系统包括至少一台冷机，该方法包括：在冷机系统运行过程中，监测当前运行的冷机输出的实际介质温度；若实际介质温度未处于末端设备要求的预设范围内，控制当前运行的冷机输出的介质直接通过回液管路返回冷机，不供给末端设备；之后当实际介质温度处于预设范围时，控制当前运行的冷机输出的介质供给末端设备。本发明能够保证供给末端设备的介质温度比较稳定，不会出现过大的波动，满足末端设备的工艺控制要求，保证了冷机系统运行的稳定。
The invention discloses a cooling machine system control method, device and cooling machine system. The chiller system includes at least one chiller, and the method includes: during the operation of the chiller system, monitoring the actual medium temperature output by the currently running chiller; if the actual medium temperature is not within the preset range required by the terminal equipment, controlling The medium output by the currently running chiller is directly returned to the chiller through the liquid return line, and is not supplied to the terminal equipment; then when the actual medium temperature is within the preset range, the medium output by the currently running chiller is controlled to be supplied to the terminal equipment. The invention can ensure that the temperature of the medium supplied to the terminal equipment is relatively stable without excessive fluctuations, meets the process control requirements of the terminal equipment, and ensures the stable operation of the cooling system.
Description
Technical Field
The invention relates to the technical field of units, in particular to a method and a device for controlling a refrigerator system and the refrigerator system.
Background
The chiller system outputs a medium (e.g., chilled water, etc.) to the end-point device to cause the end-point device to achieve the desired temperature. In the field of process air conditioning, very strict temperature fluctuation limitation exists, particularly for a factory with ultralow temperature freezing effluent, the control is very difficult, on one hand, the effluent temperature of a cold machine is close to 0 ℃, the risk of freezing a shell and tube is easy to occur, and on the other hand, the control is unstable, and the freezing water supply temperature can not meet the process requirement.
Aiming at the problem of overlarge temperature fluctuation of a medium at the supply tail end of a refrigerating machine system in the prior art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a method and a device for controlling a refrigerator system and the refrigerator system, which are used for at least solving the problem of overlarge temperature fluctuation of a medium at the supply tail end of the refrigerator system in the prior art.
In order to solve the above technical problem, an embodiment of the present invention provides a method for controlling a chiller system, where the chiller system includes at least one chiller, and the method includes: monitoring the actual medium temperature output by the currently running refrigerator in the running process of the refrigerator system; if the actual medium temperature is not within the preset range required by the tail end equipment, controlling the medium output by the currently running refrigerator to directly return to the refrigerator through a liquid return pipeline without being supplied to the tail end equipment; and then, when the actual medium temperature is in a preset range required by the end equipment, controlling the medium output by the currently running refrigerator to be supplied to the end equipment.
Optionally, before monitoring the actual medium temperature output by the currently operating chiller, the method further includes: receiving a starting signal of a refrigerator system; starting a preset number of coolers, controlling the preset number of coolers to operate according to a preset temperature, and controlling the media output by the preset number of coolers to directly return to the coolers through the liquid return pipeline without being supplied to the tail end equipment, wherein the preset temperature is higher than the set value of the media temperature of the tail end equipment; and when the actual medium temperature output by the preset number of coolers is stabilized at the preset temperature, controlling the preset number of coolers to operate according to the medium temperature set value of the tail end equipment, and controlling the medium output by the preset number of coolers to be supplied to the tail end equipment.
Optionally, a first water pump is correspondingly arranged at an inlet of each of the coolers, and the method further includes: monitoring the actual load rate of the currently running refrigerator in the running process of the refrigerator system; if the actual load rate reaches a first preset load value, forbidding to carry out frequency increasing on a first water pump corresponding to the currently running cold machine; if the actual load rate reaches a second preset load value, prohibiting the frequency reduction of the first water pump corresponding to the currently running cold machine; wherein the first preset load value is greater than the second preset load value.
Optionally, after monitoring the actual load rate of the currently operating chiller, the method further includes: and if the actual load rate reaches the first preset load value and lasts for a preset time, starting a cold machine additionally.
Optionally, after monitoring the actual load rate of the currently operating chiller, the method further includes: and if the actual load rate reaches the second preset load value and lasts for a preset time, closing the one cooling machine.
Optionally, turning off a chiller includes: judging the number of the currently operated coolers; if only one cold machine is started currently and the tail end equipment has no load requirement, the cold machine is closed; and if only one cold machine is started currently and the load requirement of the tail end equipment still exists, controlling the cold machine to maintain the current running state.
Optionally, an inlet of each of the coolers is connected to an outlet of the end equipment through the liquid return pipeline; the outlet of each cooler can be connected to the liquid return pipeline in a switching mode; the outlet of each cooler can be connected to the inlet of the terminal equipment in a switching mode.
Optionally, a first valve is arranged on a connecting pipeline between the outlet of each cooling machine and the return pipeline, and a second valve is arranged on a connecting pipeline between the outlet of each cooling machine and the inlet of the terminal device; the medium which controls the output of the currently running refrigerator directly returns to the refrigerator through a liquid return pipeline without being supplied to the terminal equipment comprises: controlling a first valve corresponding to the currently running refrigerator to be opened and controlling a second valve corresponding to the currently running refrigerator to be closed; controlling the medium output by the currently running chiller to be supplied to the end device, comprising: and controlling a first valve corresponding to the currently running refrigerator to be closed, and controlling a second valve corresponding to the currently running refrigerator to be opened.
Optionally, the chiller system further includes: the first liquid storage tank comprises a first inlet, a second inlet and an outlet, the first liquid storage tank is communicated with the liquid return pipeline through the first inlet and the outlet of the first liquid storage tank, and the outlet of each cooler can be connected to the second inlet in a break-make mode to achieve connection with the liquid return pipeline.
Optionally, the chiller system further includes: and the inlet of the second liquid storage tank is respectively connected to the outlet of each cooler in an on-off manner, and the outlet of the second liquid storage tank is connected to the inlet of the terminal equipment.
Optionally, the chiller system further includes: and the second water pump is positioned between the outlet of the second liquid storage tank and the inlet of the terminal equipment.
The embodiment of the invention also provides a refrigerator system, which comprises: at least one cooler; the inlet of each cooler is connected to the outlet of the tail end equipment through a liquid return pipeline; the outlet of each cooler can be connected to the liquid return pipeline in a switching mode; the outlet of each cooler can be connected to the inlet of the terminal equipment in a switching mode.
Optionally, a first valve is disposed on a connection pipeline between the outlet of each cooling machine and the return pipeline, and a second valve is disposed on a connection pipeline between the outlet of each cooling machine and the inlet of the end device.
Optionally, the chiller system further includes: the first liquid storage tank comprises a first inlet, a second inlet and an outlet, the first liquid storage tank is communicated with the liquid return pipeline through the first inlet and the outlet of the first liquid storage tank, and the outlet of each cooler can be connected to the second inlet in a break-make mode to achieve connection with the liquid return pipeline.
Optionally, the chiller system further includes: and the inlet of the second liquid storage tank is respectively connected to the outlet of each cooler in an on-off manner, and the outlet of the second liquid storage tank is connected to the inlet of the terminal equipment.
Optionally, the chiller system further includes: and the water pump is positioned between the outlet of the second liquid storage tank and the inlet of the terminal equipment.
The embodiment of the invention also provides a control device of the refrigerator system, the refrigerator system comprises at least one refrigerator, and the device comprises: the first monitoring module is used for monitoring the actual medium temperature output by the currently running refrigerator in the running process of the refrigerator system; the first control module is used for controlling the medium output by the currently running refrigerator to directly return to the refrigerator through a liquid return pipeline and not be supplied to the tail end equipment if the actual medium temperature is not in a preset range required by the tail end equipment; and the second control module is used for controlling the medium output by the currently running refrigerator to be supplied to the tail end equipment when the actual medium temperature is in the preset range required by the tail end equipment.
An embodiment of the present invention further provides an electronic device, including: the device comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the method of the embodiment of the invention.
Embodiments of the present invention also provide a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the method according to the embodiments of the present invention.
By applying the technical scheme of the invention, in the running process of the refrigerator system, the actual medium temperature output by the currently running refrigerator is monitored; if the actual medium temperature is not within the preset range required by the tail end equipment, controlling the medium output by the currently running refrigerator to directly return to the refrigerator through a liquid return pipeline without being supplied to the tail end equipment; and then, when the actual medium temperature is in a preset range required by the end equipment, controlling the medium output by the currently running cold machine to be supplied to the end equipment. By means of the bypass mode of the output of the cold machine, when the actual medium temperature output by the cold machine is within the preset range required by the tail end equipment, the medium is conveyed to the tail end equipment, the temperature of the medium supplied to the tail end equipment is guaranteed to be stable, excessive fluctuation cannot occur, the process control requirement of the tail end equipment is met, and the stability of the operation of a cold machine system is guaranteed.
Drawings
Fig. 1 is a first schematic diagram of a chiller system according to a first embodiment of the present invention;
fig. 2 is a second schematic diagram of a chiller system according to a first embodiment of the present invention;
fig. 3 is a third schematic diagram of a chiller system according to a first embodiment of the present invention;
fig. 4 is a flowchart of a method for controlling a chiller system according to a second embodiment of the present invention;
fig. 5 is a block diagram of a chiller system control apparatus according to a third embodiment of the present invention;
description of reference numerals:
the refrigerator 10, the liquid return pipeline 20, the end equipment 30, the first valve 40, the second valve 50, the first water pump 60, the first liquid storage tank 70, the first inlet 71, the second inlet 72, the outlet 73, the second liquid storage tank 80 and the second water pump 90.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
Example one
The embodiment provides a refrigerator system, which can ensure that the temperature of a medium supplied to a terminal device is relatively stable, excessive fluctuation is avoided, and the process control requirement of the terminal device is met. The cold machine system includes: at least one chiller 10. If the number of the coolers in the cooler system is two or more than two, the coolers 10 are connected in parallel. The medium supplied to the end device by the chiller system may be water or the like. The nominal cooling capacities of the chillers 10 in the same chiller system may be configured to be the same or different.
As shown in fig. 1, the inlet of each chiller 10 is connected to the outlet of the end unit 30 by a return line 20. The outlet of each cooler 10 is switchably connected to a return line 20. The outlet of each chiller 10 may be on-off connected to the inlet of the end unit 30. The return line 20 refers to a common line through which the medium passes from the end device 30 back to each chiller 10, such as the line AB in fig. 1.
The chiller system of this embodiment includes two media circulation loops: a self-circulation loop (bypass) of the chiller 10, and a feed circulation loop (main) containing the chiller 10 and the end device 30. In the case where the actual medium temperature output from the chiller 10 satisfies the end requirement, the outlet of the chiller 10 is not connected to the return line 20 and is connected to the inlet of the end device 30, and the medium is supplied to the end device 30 through the supply circulation circuit. Under the condition that the actual medium temperature output by the cold machine 10 does not meet the end requirement, the outlet of the cold machine 10 is directly communicated with the liquid return pipeline 20 and is not communicated with the inlet of the end equipment 30, namely, the output of the cold machine 10 is bypassed, the cold machine 10 directly carries out medium self-circulation through the liquid return pipeline 20 through the self-circulation loop, the end equipment 30 is not supplied, and the medium is supplied to the end equipment 30 through the supply circulation loop after the medium temperature meets the end requirement, so that the medium temperature supplied to the end equipment 30 is relatively stable, excessive fluctuation can not occur, the process control requirement of the end equipment is met, and the stability of the operation of a cold machine system is ensured.
In one embodiment, the on-off control of the medium circulation circuit can be achieved by means of a valve. As shown in fig. 1, a first valve 40 is disposed on a connection pipeline between an outlet of each cooler 10 and the liquid return pipeline 20, and the first valve 40 is used for controlling on/off between the cooler 10 and the liquid return pipeline 20. And a second valve 50 is arranged on a connecting pipeline between the outlet of each cold machine 10 and the inlet of the tail end equipment 30, and the second valve 50 is used for controlling the on-off between the cold machine 10 and the inlet of the tail end equipment 30. The communication between the self-circulation circuit and the supply circulation circuit can be effectively controlled by the first valve 40 and the second valve 50.
As shown in fig. 2, each of the coolers 10 is provided with a first water pump 60. A first water pump 60 may be provided at the inlet of the chiller 10. The chiller 10 and the corresponding first water pump 60 are connected in series and then are used as a chiller unit and connected in parallel with other chiller units. The first water pump 60 is used to power the medium entering the chiller 10 and to control the flow of the medium entering the chiller 10. The rated flow rate of the first water pump 60 configured for the chiller 10 with the same rated cooling capacity can be the same or different.
The chiller system may further comprise: the first liquid storage tank 70 comprises a first inlet 71, a second inlet 72 and an outlet 73, the first liquid storage tank 70 is communicated with the liquid return pipeline 20 through the first inlet 71 and the outlet 73 of the first liquid storage tank, and the outlet of each refrigerator 10 can be connected to the second inlet 72 in an on-off mode so as to achieve on-off connection with the liquid return pipeline 20. The first liquid storage tank 70 can be used for storing media properly, so that the self-circulation of the refrigerator is better realized, and the excessive media circulating in a self-circulation loop are avoided.
As shown in fig. 3, the chiller system may further comprise: and the inlets of the second liquid storage tanks 80 are respectively connected to the outlet of each refrigerator 10 in a switching way, and the outlets of the second liquid storage tanks 80 are connected to the inlet of the terminal equipment 30. That is, the outlet of each cooler 10 is switchably connected to the inlet of the end device 30 via the second reservoir tank 80. In the case where the second reservoir tank 80 is provided, the supply circulation circuit also includes the second reservoir tank 80, and the second reservoir tank 80 can store a certain amount of the medium, and since the medium is supplied to the end device 30 through the supply circulation circuit in the case where the actual medium temperature output from the refrigerator satisfies the end requirement, the temperature of the medium stored in the second reservoir tank 80 satisfies the end requirement. The bypass time of the refrigerator 10 is short, and the second liquid storage tank 80 can continuously supply the medium meeting the requirement to the end equipment 30 when the refrigerator 10 is bypassed, so that the supply of the end equipment 30 is prevented from being influenced when the refrigerator 10 is bypassed, the continuity of the supply is ensured, and the temperature of the supplied medium is stable.
The chiller system may further comprise: a second water pump 90 is positioned between the outlet of the second reservoir tank 80 and the inlet of the end device 30. The second water pump 90 is used to provide power for the media entering the end unit 30. The second water pump 90 may be a two-stage pump.
Example two
The present embodiment provides a method for controlling a chiller system, which can be implemented based on the chiller system described in the first embodiment, where the chiller system includes at least one chiller, and the present embodiment does not describe the structure of the chiller system much, and please refer to the first embodiment specifically.
Fig. 4 is a flowchart of a chiller system control method according to a second embodiment of the present invention, and as shown in fig. 4, the method includes the following steps:
s401, in the running process of the refrigerator system, the actual medium temperature output by the currently running refrigerator 10 is monitored.
S402, if the actual medium temperature is not within the preset range required by the end device 30, controlling the medium output by the chiller 10 that is currently running to directly return to the chiller through the return line 20, and not to be supplied to the end device 30.
S403, and then, when the actual medium temperature is within the preset range required by the end device 30, the medium output from the chiller 10 currently operating is controlled to be supplied to the end device 30.
The medium supplied to the end device 30 by the chiller system may be water, for example, the actual medium temperature output by the chiller is the actual outlet water temperature of the chiller.
The monitored actual medium temperature is the medium temperature at a fixed position, the specified position may be the outlet of the chiller 10, and if the medium temperature output by any chiller 10 is not in the preset range, the temperature of the mixed medium output by all currently running chillers 10 is not in the preset range, so that the medium supplied to the terminal device 30 does not meet the terminal requirement, and therefore, the medium temperature condition supplied to the terminal device 30 can be known by monitoring the medium temperature at the outlet of the chiller 10. The designated location may also be the intersection of the lines connected to the outlets of the chillers 10 and any location thereafter (e.g., location C or location D in fig. 3), where the monitored temperature of the medium more accurately and directly reflects the temperature of the medium supplied to the end device 30.
The desired preset range for end device 30 may be determined based on the media temperature set point for end device 30, for example, the preset range may be [ T [ T ] ]Is provided with－T0，TIs provided with+T0]Wherein, TIs provided withIndicating the set point of the temperature of the medium of the end device 30, e.g. 0.5 deg.C, T0Indicates a first preset value, T0The indication precision requirement can be set according to the actual situation of the refrigerator system and the requirement of a user, for example, T0May be set to 0.2 deg.c.
The actual media temperature is not within the desired preset range of the end device 30, indicating that the actual media temperature has not stabilized at the media temperature setpoint of the end device 30, at which time the media cannot be delivered to the end device 30. The medium output by the currently running cold machine 10 is controlled to directly return to the cold machine through the liquid return pipeline 20, which is equivalent to bypassing the output of the currently running cold machine 10, and the medium does not pass through the end device 30, so that the currently running cold machine 10 performs self-circulation, and waits for the temperature of the actual medium to be stable.
The actual media temperature is within the predetermined range of the end device 30 requirement indicating that the actual media temperature has stabilized at the end device 30 media temperature setpoint, at which time media meeting the end requirement can be delivered to the end device 30.
In the control method of the chiller system of the embodiment, in the running process of the chiller system, the actual medium temperature output by the currently running chiller 10 is monitored; if the actual medium temperature is not within the preset range required by the end device 30, controlling the medium output by the currently running refrigerator 10 to directly return to the refrigerator 10 through the liquid return pipeline 20 without being supplied to the end device 30; thereafter, when the actual medium temperature is within the preset range required by the end device 30, the medium output from the chiller 10 currently operating is controlled to be supplied to the end device 30. By means of bypassing the output of the refrigerator, when the actual medium temperature output by the refrigerator 10 is within the preset range required by the end equipment 30, the medium is conveyed to the end equipment 30, so that the temperature of the medium supplied to the end equipment 30 is relatively stable, excessive fluctuation is avoided, the process control requirement of the end equipment is met, and the stability of the operation of a refrigerator system is ensured.
In one embodiment, before monitoring the actual medium temperature output by the chiller 10 in the current operation, the method further comprises: receiving a starting signal of a refrigerator system; starting a preset number of coolers 10, controlling the preset number of coolers 10 to operate according to a preset temperature, and controlling the medium output by the preset number of coolers 10 to directly return to the coolers 10 through a return pipeline 20 without being supplied to the terminal equipment 30, wherein the preset temperature is higher than the medium temperature set value of the terminal equipment 30; when the actual medium temperature output by the coolers 10 in the preset number is stabilized at the preset temperature, the coolers 10 in the preset number are controlled to operate according to the medium temperature set value of the terminal equipment 30, and the media output by the coolers 10 in the preset number are controlled to be supplied to the terminal equipment 30.
The preset number can be set according to actual requirements, generally speaking, the preset number is set to 1, namely, a refrigerator is started when the refrigerator system is just started. The actual medium temperature output by the chiller 10 of the preset number is the temperature at the specified position, and the explanation of the specified position is as described above and will not be described herein. The preset temperature may be the sum of the medium temperature setpoint of the end device 30 and the second preset value Δ T. Δ T is a positive number, and is generally set to a small value, for example, Δ T is set to 0.1 ℃ or 0.2 ℃ or the like. The actual medium temperature is stabilized at the preset temperature, which means that the actual medium temperature fluctuates within a small range around the preset temperature, and the range corresponding to the stabilization at the preset temperature may be [ T ] similar to the preset range required by the terminal device 301－T0，T1+T0]Wherein, T1Indicating a preset temperature, T0Indicating a first preset value.
In the embodiment, when the refrigerator system is not started, the difference between the actual medium temperature in the pipeline and the medium temperature set value is large, so that the output of the refrigerator is bypassed when the refrigerator system is just started, the refrigerator system performs self-circulation of the refrigerator according to the preset temperature higher than the medium temperature set value, the refrigerator is prevented from being raised to a high load at a time, and the stable and reliable operation of the refrigerator is facilitated; after the temperature of the medium is stabilized at the preset temperature, the medium is provided for the terminal equipment according to the set value of the temperature of the medium, and the temperature of the provided medium can meet the requirement of terminal process control.
In one embodiment, a first water pump 60 is disposed at the inlet of each cooler 10, and the method may further include: monitoring the actual load rate of the currently running refrigerator 10 in the running process of the refrigerator system; if the actual load rate reaches a first preset load value, forbidding the frequency increase of the first water pump 60 corresponding to the currently running cold machine 10; if the actual load rate reaches a second preset load value, the first water pump 60 corresponding to the currently running cold machine 10 is prohibited from carrying out frequency reduction; the first preset load value is larger than the second preset load value.
The actual load factor refers to the ratio of the actual refrigerating capacity of the refrigerator to the rated refrigerating capacity. The first preset load value is a threshold value used for measuring whether the chiller 10 is in full load operation, the second preset load value is a threshold value used for measuring whether the chiller 10 is in minimum load operation, and both the first preset load value and the second preset load value can be set according to the actual condition of the chiller system, for example, the first preset load value is set to be 95%, and the second preset load value is set to be 30%.
The actual load rate of the cold machine reaches a first preset load value, the full-load operation of the cold machine is indicated, the maximum processing capacity of the cold machine is reached, if the frequency of a first water pump corresponding to the cold machine is increased at the moment, the medium flow entering the cold machine is increased, and the actual medium temperature output by the cold machine can be increased due to the fact that the cold machine is in full-load operation and cannot be processed. In this case, the frequency of the first water pump corresponding to the chiller is prohibited from increasing, and the temperature of the medium output by the chiller can be prevented from increasing, thereby maintaining the stability of the temperature of the medium.
And if the frequency of the first water pump corresponding to the cold machine is reduced at the moment, the medium flow input into the cold machine is reduced, and the load cannot be reduced continuously because the cold machine operates at the lowest load, so that the temperature of the actual medium output by the cold machine is reduced. Under the condition, the frequency of the first water pump corresponding to the cold machine is forbidden to be reduced, the temperature of the medium output by the cold machine can be prevented from being reduced, the stability of the temperature of the medium can be maintained, meanwhile, the condition that the medium output by the cold machine is frozen and damages a pipeline or a device due to the fact that the temperature of the medium output by the cold machine is reduced to 0 ℃ or below 0 ℃ can be avoided, and a certain protection effect on freezing prevention of the cold machine is achieved.
The frequency of the corresponding first water pump is adjusted and limited according to the actual load factor of the cold machine, the stability of the temperature of the output medium of the cold machine can be ensured, and certain protection can be achieved on the anti-freezing of the cold machine.
In the present embodiment, since the medium temperature entering each chiller 10 is the same and the medium temperature set value is the same for each chiller 10 currently operating, the actual load factor of each chiller 10 is also the same and the actual medium temperature output by each chiller 10 is the same. In the present embodiment, the frequency of the corresponding currently-operated first water pump 60 is adjusted according to the actual medium temperature output by the currently-operated chiller 10, and therefore the frequency of each currently-operated first water pump 60 is also the same. That is, during the operation of the chiller system, the load factor of each chiller 10 currently operating is synchronously adjusted, and the frequency of each first water pump 60 currently operating is also synchronously adjusted.
In one embodiment, after monitoring the actual load rate of the chiller 10 currently operating, it further includes: and if the actual load rate reaches the first preset load value and lasts for the preset time, increasing to start one cooling machine 10. The preset time can be set according to actual conditions, and the preset time is generally set to be short, so that the new cooler can be started timely, the temperature of the medium is stable, and the preset time can be set to be 5-10 min. When one cooler 10 is additionally started, the first water pump 60 corresponding to the cooler 10 is also started. The load rates of the newly started chillers 10 are identical to the load rates of the already operating chillers 10, and then the load rates of these chillers 10 are synchronously adjusted according to certain control logic, for example, the chiller load rates are controlled based on the chiller inlet and outlet water temperature differences. The frequency of the first water pump 60 corresponding to the newly started cooler 10 is consistent with the frequency of the first water pump 60 already running, and then the frequency of the first water pumps 60 is synchronously adjusted according to certain control logic, for example, the frequency of the first water pump 60 is increased when the actual medium temperature output by the cooler 10 is higher than the set value of the medium temperature. In the embodiment, under the condition that the full-load operation of the refrigerator lasts for the preset time, the refrigerator is additionally started in time to meet the requirement of the tail end.
In one embodiment, after monitoring the actual load rate of the chiller 10 currently operating, it further includes: and if the actual load rate reaches the second preset load value and lasts for the preset time, closing the one cooling machine 10. When one cooler 10 is turned off, the first water pump 60 corresponding to the cooler 10 is also turned off. After a chiller 10 is shut down, the load factor of the chiller 10 that is still currently operating is synchronously adjusted according to certain control logic and the frequency of the first water pump 60 that is still currently operating is synchronously adjusted according to certain control logic. In the embodiment, one cold machine is closed in time under the condition that the low-load operation of the cold machine lasts for the preset time, so that the energy consumption is reduced.
Further, shutting down a chiller 10 includes: judging the number of the currently operated coolers 10; if only one cold machine 10 is currently started and the end device 30 has no load demand, the cold machine 10 is closed; if only one refrigerator 10 is started currently and the end equipment 30 still has a load requirement, the refrigerator 10 is controlled to maintain the current operation state. The running number of the cold machine and the load requirement of the tail end equipment are combined for control, so that the effective running and energy saving of the cold machine system can be ensured, and the stability of the medium temperature provided by the cold machine system is maintained.
The chiller system comprises at least one chiller 10, the inlet of each chiller 10 is connected to the outlet of the end device 30 through the liquid return pipeline 20, the outlet of each chiller 10 can be connected to the liquid return pipeline 20 in a switching mode, and the outlet of each chiller 10 can be connected to the inlet of the end device 30 in a switching mode.
In one embodiment, a first valve 40 is disposed on a connection line between the outlet of each cooler 10 and the liquid return line 20, and a second valve 50 is disposed on a connection line between the outlet of each cooler 10 and the inlet of the end device 30. Specifically, the medium that controls the output of the chiller 10 in the current operation is directly returned to the chiller 10 through the return line 20 without being supplied to the end device 30, and includes: controlling a first valve 40 corresponding to the currently running refrigerator 10 to be opened, and controlling a second valve 50 corresponding to the currently running refrigerator 10 to be closed; the medium supply end device 30 that controls the output of the chiller 10 that is currently operating includes: and controlling the first valve 40 corresponding to the currently running refrigerator 10 to be closed, and controlling the second valve 50 corresponding to the currently running refrigerator 10 to be opened. The on-off control of the medium circulation loop is realized by controlling the valve, the bypass of the cold machine 10 is performed or the medium with stable temperature is provided for the end equipment 30, and the control is simple and reliable.
EXAMPLE III
The present embodiment describes the above-mentioned cooling system control method with reference to a specific example, however, it should be noted that this specific example is only for better describing the present application, and does not constitute a limitation to the present application. The same or corresponding terms as those of the above-described embodiments are explained, and the description of the present embodiment is omitted.
In this embodiment, water is taken as an example, that is, the chiller outputs chilled water.
After the refrigerator system is started, a period of time is required for the outlet water temperature of the refrigerator to reach the set outlet water temperature, and for the refrigerator system applied to the technical field, the fluctuation limit of the outlet water temperature is strict, and chilled water with stable temperature must be provided for the tail end.
The specific control mode is as follows:
when the chiller system is started for the first time, a chiller 10 is started, specifically, a first valve 40 corresponding to the chiller 10 is started first, a first water pump 60 (i.e., a chilled water pump) corresponding to the chiller 10 is started, and then the chiller 10 is started. The target outlet water temperature of the refrigerator 10 is set to T1(i.e., the preset temperature), T1＝TIs provided with+△T，TIs provided withRepresenting a set outlet temperature of the end unit 30, Δ T being positive, and being generally small, e.g. TIs provided with＝0.5℃，△T＝0.2℃，T10.7 ℃. At this time, the chilled water in the system is self-circulated in the chiller 10 and the first liquid storage tank 70 (i.e., the return water tank) which are currently running, i.e., the chilled water from the chiller 10 enters the first liquid storage tank 70, and the chilled water from the first liquid storage tank 70 returns to the chiller 10. The temperature of the chilled water is reduced through self-circulation, and the temperature of the outlet water of the cold machine is stabilized at T1When the temperature of the water is lower than the preset temperature, the first valve 40 corresponding to the refrigerator 10 is closed, the second valve 50 corresponding to the refrigerator 10 is opened, and meanwhile the target outlet water temperature of the refrigerator is reset to be TIs provided withAt this time, the actual outlet water temperature of the refrigerator is the temperature required by the end device 30, and water can be supplied to the end device 30.
Before the cold machine system is started, the temperature of water in the system pipeline is higher due to reasons such as pipeline heat absorption and the like, and the embodiment is just started according to T1(higher than T)Is provided with) To control the operation of the cooling machine andno water is supplied to the tail end, and the temperature of the outlet water of the equal-temperature cooler is stabilized at T1According to TIs provided withThe refrigerator is controlled to operate and water is supplied to the tail end, so that the load of the refrigerator is not required to be increased greatly when the system is just started, and the stable and reliable operation of the refrigerator is facilitated.
In the running process of the cold machine system, the actual outlet water temperature of the cold machine needs to be continuously ensured to be stabilized at TIs provided withSpecifically, the frequency of the first water pump 60 may be adjusted and limited according to the chiller load factor to maintain the chiller outlet water temperature.
(1) When the actual load factor of the currently running refrigerator 10 reaches the full load operation (for example, the actual load factor reaches 95%), the frequency of the first water pump 60 corresponding to the refrigerator is controlled, and the water outlet temperature of the refrigerator is maintained to be T by forbidding the first water pump 60 to increase the frequencyIs provided with. Specifically, the full-load operation of the cold machine indicates that the maximum processing capacity of the cold machine is achieved, that is, the current cold machine inlet and outlet water temperature difference and the current water flow can be processed to the maximum extent, if the frequency of the corresponding first water pump is increased at the moment, the water flow is increased, the cold machine cannot process the water, and the actual outlet water temperature is increased, so that the outlet water temperature is unstable, and therefore, the first water pump 60 is prohibited from increasing the frequency under the full-load operation condition of the cold machine, and the outlet water temperature of the cold machine can be maintained to be stable.
If the refrigerator 10 which is currently operated runs at full load for t1 continuously (which is equal to the preset time, such as 5-10 min), one refrigerator 10 is additionally started to better maintain the outlet water temperature of the refrigerator, so as to meet the end requirement. The frequency of the first water pump 60 corresponding to the newly started chiller 10 is kept identical to the frequency of the already operated first water pump 60.
(2) When the actual load rate of the currently running cold machine 10 is in low-load operation (for example, the actual load rate is 30%), the first water pump 60 corresponding to the cold machine is prohibited from reducing the frequency to maintain the cold outlet water temperature at TIs provided with. Specifically, the low-load operation of the cold machine indicates that the minimum processing capacity of the cold machine is reached, if the frequency of the chilled water pump is reduced at the moment, the water flow is reduced, the load cannot be reduced continuously due to the lowest load of the cold machine, the actual outlet water temperature is reduced, and therefore the outlet water temperature is unstable, and therefore the low-load operation of the cold machine is realized at the low load of the cold machineThe first water pump 60 is forbidden to reduce the frequency under the operation condition, the outlet water temperature of the refrigerator can be maintained to be stable, the condition that the pipeline or the device is frozen due to the fact that the actual outlet water temperature is reduced to 0 ℃ or below 0 ℃ can be prevented, and a certain protection effect on freezing prevention of the refrigerator is achieved.
If the currently operating chiller 10 is in low load operation for time t1, the operation of one chiller 10 may be reduced. If only one refrigerator 10 is operated and the end has no load demand, the refrigerator 10 may be shut down, and if the end has a load demand, the current operation state of the refrigerator 10 is maintained.
In the normal operation process of the cold machine system, namely the outlet water temperature of the cold machine is stabilized at TIs provided withAnd normally supplying water to the tail end, monitoring the outlet water temperature of the refrigerator in real time, and when the outlet water temperature of the refrigerator does not meet the tail end requirement (namely cannot be stabilized at T)Is provided with) In the process, the freezing supply return water is bypassed, and the cold machine outlet water is supplied to the first liquid storage tank 70 for circulation. When the outlet water temperature of the cold machine meets the end requirement (namely, the temperature is stabilized at T)Is provided with) Thereafter, the bypass is turned off (i.e., first valve 40 is closed), the main circuit is switched back (i.e., second valve 50 is opened), and the chiller effluent enters second reservoir tank 80 to supply water to end-point device 30, thereby ensuring stability of the water supply during system operation. For example, in the operation process of the chiller system, the end load demand is suddenly increased, the water temperature returned from the end device 30 should be 12 ℃ originally, the water temperature is suddenly increased to 15 ℃, the chiller currently operating may not be processed suddenly at this time, and the actual outlet water temperature does not meet the end requirement, for example, the outlet water temperature is set to 0.5 ℃ originally, the actual outlet water temperature may become 1 ℃ or 1.5 ℃, at this time, water cannot be supplied to the end, self-circulation is performed through a bypass, and after the load rate of the chiller becomes high or a new chiller is started, water supply to the end can be continued if the outlet water temperature of the chiller meets the end requirement. It should be noted that a certain amount of chilled water can be placed in the second liquid storage tank 80, the chilled water stored in the second liquid storage tank meets the requirements of the tail end, the bypass time is not long, the water in the second liquid storage tank 80 can be used for the tail end during the bypass time, and the temperature of the outlet water of the refrigerator is ensured to be stable as well as the temperature of the outlet water of the refrigerator is ensured to be stableThe supply of water to the tip is not affected.
In the embodiment, a freezing water supply and return bypass mode is utilized, and when the system is started for the first time, the chilled water is supplied to the tail end after the water outlet temperature of the cold machine is stable, so that the freezing water supply temperature can meet the requirement of tail end process control. In the running process of the system, the temperature of the outlet water of the cold machine is monitored in real time, when the requirement of the tail end is not met, the freezing supply backwater is bypassed, and the main path is switched back to supply water to the tail end after the requirement of the tail end is met again. And the frequency of the freezing water pump is adjusted and limited according to the load factor of the refrigerator, so that the stability of the outlet water temperature of the refrigerator is ensured on one hand, and the anti-freezing of the refrigerator can be protected to a certain extent on the other hand.
The cold machine water outlet temperature is continuously and stably ensured by the bypass treatment of the chilled water outlet and the limitation of the frequency of the chilled water pump according to the cold machine load factor, the cold machine water outlet temperature is ensured not to fluctuate too much and meet the requirements of the tail end process, and the stability of the system operation is ensured.
Example four
Based on the same inventive concept, this embodiment provides a chiller system control apparatus, which can be used to implement the chiller system control method described in the above embodiments. The device may be implemented by software and/or hardware, and the device may be generally integrated in a controller of a chiller system. The chiller system includes at least one chiller 10.
Fig. 5 is a block diagram of a chiller system control apparatus according to a third embodiment of the present invention, and as shown in fig. 5, the apparatus includes:
the first monitoring module 51 is used for monitoring the actual medium temperature output by the refrigerator 10 in the current operation process in the operation process of the refrigerator system;
the first control module 52 is configured to, if the actual medium temperature is not within the preset range required by the end device 30, control the medium output by the currently-operating chiller 10 to directly return to the chiller through the return line 20 without being supplied to the end device 30;
and the second control module 53 is used for controlling the medium output by the currently running refrigerator 10 to be supplied to the end device 30 when the actual medium temperature is in the preset range required by the end device 30.
Optionally, the chiller system control device further includes:
the receiving module is used for receiving a starting signal of the refrigerator system before monitoring the actual medium temperature output by the refrigerator 10 which operates currently;
the third control module is configured to start a preset number of coolers 10, control the preset number of coolers 10 to operate at a preset temperature, and control a medium output by the preset number of coolers 10 to directly return to the coolers 10 through the liquid return pipeline 20 without being supplied to the end device 30, where the preset temperature is higher than a medium temperature set value of the end device 30;
and the fourth control module is configured to control the preset number of coolers 10 to operate according to the set value of the medium temperature of the end device 30 and control the preset number of media output by the coolers 10 to be supplied to the end device 30 when the actual medium temperature output by the preset number of coolers 10 is stabilized at the preset temperature.
Optionally, each inlet of the chiller 10 is correspondingly provided with a first water pump 60, and the chiller system control device further includes:
the second monitoring module is used for monitoring the actual load rate of the currently running refrigerator 10 in the running process of the refrigerator system;
the fifth control module is used for forbidding the frequency increasing of the first water pump 6 corresponding to the currently running cold machine 10 if the actual load rate reaches a first preset load value;
the sixth control module is configured to prohibit frequency reduction of the first water pump 60 corresponding to the currently-operating chiller 10 if the actual load factor reaches a second preset load value;
wherein the first preset load value is greater than the second preset load value.
Optionally, the chiller system control device further includes: and the seventh control module is configured to, after monitoring the actual load rate of the currently running chiller 10, increase to start one chiller 10 if the actual load rate reaches the first preset load value and lasts for a preset time.
Optionally, the chiller system control device further includes: and the eighth control module is configured to, after monitoring the actual load rate of the currently operating chiller 10, close one chiller 10 if the actual load rate reaches the second preset load value and lasts for a preset time.
Optionally, the eighth control module is specifically configured to: judging the number of the currently operated coolers 10; if only one cold machine 10 is currently started and the end device 30 has no load demand, the cold machine 10 is closed; if only one refrigerator 10 is started currently and the end equipment 30 still has a load requirement, the refrigerator 10 is controlled to maintain the current operation state.
Optionally, an inlet of each of the coolers 10 is connected to an outlet of the end device 30 through the liquid return pipeline 20, an outlet of each of the coolers 10 is connected to the liquid return pipeline 20 in an on-off manner, and an outlet of each of the coolers 10 is connected to an inlet of the end device 30 in an on-off manner.
Optionally, a first valve 40 is arranged on a connecting pipeline between the outlet of each of the coolers 10 and the return pipeline 20, and a second valve 50 is arranged on a connecting pipeline between the outlet of each of the coolers 10 and the inlet of the end device 30;
the first control module 52 is specifically configured to: controlling a first valve 40 corresponding to the currently running refrigerator 10 to be opened, and controlling a second valve 50 corresponding to the currently running refrigerator 10 to be closed;
the second control module 53 is specifically configured to: and controlling a first valve 40 corresponding to the currently running refrigerator 10 to be closed, and controlling a second valve 50 corresponding to the currently running refrigerator 10 to be opened.
The specific structure of the chiller system is described with reference to the first embodiment. The refrigerator system control device can execute the refrigerator system control method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. For details of the chiller system control method and the chiller system provided in the embodiments of the present invention, reference may be made to the technical details not described in detail in the embodiments.
EXAMPLE five
The present embodiment provides an electronic device, including: the device comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the method of the embodiment of the invention.
EXAMPLE six
The present embodiment provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method according to an embodiment of the present invention.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (19)
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