CN110557930A - data center cooling system and control method - Google Patents
data center cooling system and control method Download PDFInfo
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- CN110557930A CN110557930A CN201910729236.1A CN201910729236A CN110557930A CN 110557930 A CN110557930 A CN 110557930A CN 201910729236 A CN201910729236 A CN 201910729236A CN 110557930 A CN110557930 A CN 110557930A
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- 238000001816 cooling Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 316
- 238000005057 refrigeration Methods 0.000 claims abstract description 51
- 238000009825 accumulation Methods 0.000 claims abstract description 40
- 238000007710 freezing Methods 0.000 claims abstract description 39
- 230000008014 freezing Effects 0.000 claims abstract description 39
- 238000012544 monitoring process Methods 0.000 claims description 20
- 230000001276 controlling effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/20763—Liquid cooling without phase change
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/20836—Thermal management, e.g. server temperature control
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of data center cold source supply systems, in particular to a data center cold supply system and a control method. The data center cold supply system comprises a tail end water supply loop, a tail end water return loop, a chilled water supply loop, a chilled water return loop, a plurality of refrigeration units, a plurality of secondary refrigeration water pumps, a cold accumulation tank, a flow sensor and a control device, wherein each refrigeration unit comprises a water chilling unit, a plate heat exchanger and a primary refrigeration water pump which are sequentially communicated; in this data center cooling system, the frequency of the one-level chilled water pump of freezing unit is by rivers in the cold-storage tank to and flow control, and the frequency of the two-level chilled water pump then is changed the demand by terminal load and is adjusted, and cold-storage tank operation mode is completely independent with data center's cooling demand flow control, each other does not influence, and control framework is simple, and the stability and the reliability of system operation are higher relatively and maintain the convenience.
Description
Technical Field
the invention relates to the technical field of data center cold source supply systems, in particular to a data center cold supply system and a control method.
Background
The data center is a place for providing an operating environment for electronic information equipment, and the measuring standard of the importance of the data center is mainly based on the economic and social loss and influence degree caused by network information interruption or important data loss caused by infrastructure faults. Data centers of information and data services such as internet, finance, cloud computing and government basically require the grade of the data center to be A grade, and basic facilities can meet basic operation requirements of electronic information equipment after an accident occurs or when single-system equipment is maintained or overhauled.
When the commercial power fails, in order to ensure that the service of the data center is not interrupted and enough time can be reserved for data storage and the like, the uninterrupted cooling of the data center needs to be ensured. The design generally adopts a water storage device arranged in a chilled water system, and the water storage time can meet the starting time of the diesel engine, the starting time of the cold engine and the loading time of the cold engine. A system architecture commonly used in a data center is provided with a primary pump variable flow system and a secondary pump variable flow system, and a continuous cold supply device can adopt an open cold accumulation tank and a closed cold accumulation tank.
In recent years, for maximizing the number of cabinets, a cold source system usually adopts a primary pump variable flow system, and although the system can save the building area of a refrigeration machine room, an open cold storage tank is adopted on a continuous cold supply system, and a set of cold release pump is additionally added. The system can not control the flow of the bypass cold accumulation tank in the ordinary cold filling mode of the cold accumulation tank; the number of devices and valve components which need to be opened in the emergency cooling mode of the cold accumulation tank is large; the load regulation at the tail end can be influenced under the super cold filling mode of the cold accumulation tank, the control is relatively complex, the reliability can be reduced, and the operation and maintenance difficulty is increased.
Disclosure of Invention
The invention discloses a data center cooling system and a control method thereof, which are used for providing stability and reliability of system operation.
In order to achieve the purpose, the invention provides the following technical scheme:
A data center cooling system, comprising: the system comprises a tail end water supply loop, a tail end water return loop, a chilled water supply loop, a chilled water return loop, a plurality of freezing units, a plurality of secondary chilled water pumps, a cold accumulation tank, a flow sensor and a control device, wherein each freezing unit comprises a water chilling unit, a plate heat exchanger and a primary chilled water pump which are sequentially communicated; wherein:
The tail end water supply loop and the tail end water return loop are used for circularly supplying cold for a data center, and the tail end water return loop is communicated with the chilled water return loop; the water inlet end of each secondary chilled water pump is communicated with the chilled water supply loop, and the water outlet end of each secondary chilled water pump is communicated with the tail end water supply loop;
in each freezing unit, the water inlet end of the water chilling unit is communicated with the chilled water supply loop, and the water outlet end of the primary chilled water pump is communicated with the chilled water return loop; the secondary chilled water pump is provided with an uninterruptible power supply;
The first opening of the cold accumulation tank is communicated with the chilled water supply loop, the second opening of the cold accumulation tank is communicated with the chilled water return loop, a first flow meter and a first electric valve are arranged on a pipeline between the first opening of the cold accumulation tank and the chilled water supply loop, and a second flow meter and a second electric valve are arranged on a pipeline between the second opening of the cold accumulation tank and the chilled water return loop;
A tail end bypass pipeline is arranged between the tail end water supply loop and the chilled water return loop, and a tail end electric valve is arranged on the chilled water bypass pipeline; the flow sensor is used for monitoring the cooling demand flow of the data center;
the control device is respectively connected with the primary chilled water pump, the secondary chilled water pump, the flow sensor, the tail end electric valve, the first flow meter, the first electric valve, the second flow meter and the second electric valve through lines, so that the secondary chilled water pump and the tail end electric valve are controlled according to feedback of the flow sensor, or the primary chilled water pump is controlled according to feedback of the first flow meter and the second flow meter.
When the data center cooling system normally operates, a freezing unit supplies cooling for the data center, chilled water of the freezing unit enters the data center from a tail end water supply loop through a chilled water supply loop to carry out water cooling and cooling, water with increased temperature enters a chilled water return loop through a tail end water return loop to return to the freezing unit to carry out re-cooling so as to realize water cooling circulation of the whole system, in the process, a first flow meter and a second flow meter can monitor the flow direction and the flow rate of a cold storage tank, a first electric valve and a second electric valve can control the flow rate of the cold storage tank, and the frequency of a primary freezing water pump in the freezing unit is controlled according to the flow direction and the flow rate of water in the cold storage tank so as to meet the cooling demand flow rate of the data center; when the mains supply fails, the freezing unit is shut down, the secondary freezing water pump is started, and the frequency of the secondary freezing water pump is adjusted according to the cooling demand flow of the data center so as to convey water in the cold storage tank to the data center for cooling the data center.
It can be seen that in the data center cooling system, the frequency of the primary chilled water pump of the refrigeration unit is controlled by the flow direction and the flow rate of the water in the cold accumulation tank, the frequency of the secondary chilled water pump is regulated by the change demand of the terminal load, the operation mode of the cold accumulation tank and the flow regulation of the cooling demand of the data center are completely independent and do not influence each other, the control framework is simple, the stability and the reliability of the system operation are relatively high, and the system is convenient to maintain.
Optionally, the control device comprises a group controller, and a cold storage tank controller and two unit controllers which are in signal connection with the group controller, and both the two unit controllers are in control connection with a plurality of the secondary chilled water pumps.
Optionally, the group controller is further provided with an alarm.
A control method applied to the data center cooling system in the technical scheme comprises the following steps:
monitoring the working state of the refrigeration unit;
judging whether the freezing unit normally operates according to the working state of the freezing unit;
if the refrigeration unit is in normal operation, monitoring the flow and the flow direction of the cold accumulation tank, and adjusting the frequency of the primary refrigeration water pump according to the flow and the flow direction of the cold accumulation tank so as to supply cold to the data center;
And if the refrigeration unit is shut down, monitoring the cooling demand flow of the data center, and adjusting the frequency of the secondary refrigeration water pump and the opening degree of the tail end electric valve according to the cooling demand flow so as to supply cooling to the data center.
Optionally, the monitoring the cooling demand flow of the data center and adjusting the frequency of the secondary chilled water pump and the opening of the tail end electric valve according to the cooling demand flow comprises:
when the cooling demand flow is larger than the flow provided by the lowest operation frequency of a single secondary chilled water pump, the pressure difference required by the worst loop of the data center is controlled by the frequency of the secondary chilled water pump;
When the cooling demand flow is less than the flow provided by the lowest operating frequency of the single secondary chilled water pump, the pressure differential required by the worst-case loop of the data center is controlled by the terminal electric valve.
optionally, the monitoring the flow and the flow direction of the cold storage tank and adjusting the frequency of the primary chilled water pump according to the flow and the flow direction of the cold storage tank comprises:
When the water in the cold accumulation tank flows from the first opening to the second opening and the flow of the first opening of the cold accumulation tank is larger than the flow forward flow set value of the second opening of the cold accumulation tank, controlling the frequency of the primary chilled water pump to meet the cooling demand flow of the data center;
when the water in the cold accumulation tank flows to the first opening from the second opening, the first flow meter and the second flow meter give an alarm, the flow difference between the second opening and the first opening is monitored, and the cold supply state of the refrigeration unit is controlled according to the flow difference until the water in the cold accumulation tank flows to the second opening from the first opening and keeps the positive direction for a set time.
optionally, the controlling the cooling state of the refrigeration unit according to the magnitude of the reverse flow comprises:
When the flow of the second opening of the cold storage tank is larger than the flow of the first opening of the cold storage tank by a first reverse flow set value and is kept for a reverse set time, adjusting the frequency of the primary chilled water pump to be maximum;
and when the flow of the second opening of the cold storage tank is greater than the flow of the first opening of the cold storage tank and the second reverse flow set value, keeping the reverse set time length, and restarting the freezing unit to supply cold water for the cold storage tank.
Optionally, the forward flow set value is 0-100 3/h, and the forward set time period is 5-30 min.
Optionally, the first reverse flow value is 0-50m 3/h, the second reverse flow value is 50-100m 3/h, and the reverse set time period is 5-30 min.
Optionally, during a restart after shutdown of the refrigeration unit:
And controlling the water in the freezing unit to self-circulate to the outlet water temperature of the outlet end of the primary freezing water pump to meet the water cooling requirement.
Drawings
Fig. 1 is a schematic diagram illustrating a cold storage tank of a data center cooling system in a micro-cooling mode according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a cold storage tank of a data center cooling system in an emergency cold charging mode according to an embodiment of the present invention;
fig. 3 is an operation schematic diagram of a cold storage tank of a data center cold supply system in a super cold charging mode according to an embodiment of the present invention;
Fig. 4 is a schematic diagram of a control method of a data center cooling system according to an embodiment of the present invention.
Icon: 11-terminal water supply loop; 12-terminal water return loop; 21-chilled water supply loop; 22-a chilled water return loop; 3-a freezing unit; 31-a water chiller; 32-plate heat exchanger; 33-first-stage chilled water pump; 4-a two-stage chilled water pump; 5-cold storage tank; 511-a first flow meter; 512-first electrically operated valve; 521-a second flow meter; 522-second electrically operated valve; 6-terminal bypass line; 61-end electric valve; 7-chilled water bypass line; 71-first chilled water electric valve; 72-second chilled water electric valve; 8-a water supply and return bypass pipeline; 81-supply and return water flowmeter; 82-water supply and return electric valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
as shown in fig. 1 to 3, an embodiment of the present invention provides a data center cooling system, including: a terminal water supply loop 11, a terminal water return loop 12, a chilled water supply loop 21, a chilled water return loop 22, a plurality of refrigeration units 3, a plurality of two-stage chilled water pumps 4, a cold storage tank 5, a flow sensor, and a control device.
Specifically, the tail end water supply loop 11 and the tail end water return loop 12 are used for circularly supplying cold for the data center, and the tail end water return loop 12 is communicated with the chilled water return loop 22; each freezing unit 3 comprises a water chilling unit 31, a plate heat exchanger 32 and a primary freezing water pump 33 which are sequentially communicated, wherein the water inlet end of the water chilling unit 31 is communicated with the freezing water supply loop 21, and the water outlet end of the primary freezing water pump 33 is communicated with the freezing water return loop 22.
The tail end water return loop 12 conveys water subjected to heat exchange in the data center to a chilled water return loop 22, the water is conveyed to the freezing unit 3 through the chilled water return loop 22, the water is subjected to heat exchange through a plate heat exchanger 32 and a water chilling unit 31 in sequence under the action of a primary chilled water pump 33 and then is cooled to the temperature meeting the cooling requirement, the water enters the chilled water supply loop 21 through the water outlet end of the water chilling unit 31 and reaches the tail end water supply loop 11 through a secondary chilled water pump, the water is conveyed to the data center through the tail end water supply loop 11 to supply cold and cool the data center, and the water subjected to heat exchange with the data center enters the tail end water return loop 12 to realize the cold supply circulation of the data.
The chilled water storage tank 5 is arranged between the chilled water supply loop 21 and the chilled water return loop 22, a first opening of the chilled water storage tank 5 is communicated with the chilled water supply loop 21, a second opening of the chilled water storage tank 5 is communicated with the chilled water return loop 22, a first flow meter 511 and a first electric valve 512 are arranged on a pipeline between the first opening of the chilled water storage tank 5 and the chilled water supply loop 21, and a second flow meter 521 and a second electric valve 522 are arranged on a pipeline between the second opening of the chilled water storage tank 5 and the chilled water return loop 22. The first flow meter 511, the second flow meter 521, the first electric valve 512, the second electric valve 522, and the first-stage chilled water pump 33 are all connected to a group controller line of the control device.
The first flow meter 511 and the second flow meter 521 are both bidirectional flow meters, and can monitor both the water flow direction of the cold storage tank 5 and the flow rate of the water flow in the cold storage tank 5. In the case where the refrigeration unit 3 is operating normally, the water of the chilled water supply loop 21 enters from the first opening of the cold storage tank 5 and flows out from the second opening to the chilled water return loop 22. In this process, the frequency of the primary chilled water pump 33 of the freezing unit 3 is controlled according to the flow direction and the flow rate of the water in the cold storage tank 5, so as to meet the cooling demand flow rate of the data center. Meanwhile, the flow rate difference between the first opening and the second opening of the cold storage tank 5 can be set by controlling the opening and closing of the first electric valve 512 and the second electric valve 522 by the group controller to perform the micro-cooling operation on the cold storage tank 5, as shown in fig. 1.
A tail end bypass pipeline 6 is arranged between the tail end water supply loop 11 and the chilled water return loop 22, a tail end electric valve 61 is arranged on the chilled water bypass pipeline 7, and the flow sensor is used for monitoring the cooling demand flow of the data center. Here, the end electric valve 61 and the flow sensor are connected to a group controller line of the control device, the secondary chilled water pump 4 is connected to a unit controller line of the control device, when the refrigeration unit 3 is shut down, since the secondary chilled water pump 4 is configured with an uninterruptible power supply, the control device controls the end electric valve 61 and the secondary chilled water pump 4 according to the feedback of the flow sensor to adjust the flow rates of the end water supply line and the chilled water return line, and the water in the cold storage tank 5 is delivered to the end water supply loop 11 to supply cold for the data center, and the cold storage tank 5 is in an emergency cold charging mode, as shown in fig. 2.
Wherein, the unit controller is two, and a plurality of second grade frozen water pump 4 of equal control connection. The reason for this is that in the case of a failure of the refrigeration unit 3, the two unit controllers have completely consistent programs and are hot-standby with each other, so that a control mode of 'one use and one standby' can be realized, when one of the unit controllers fails, the other unit controller is immediately adopted, so that the normal operation of the system is ensured, and the reliability of the control of the whole system can be improved.
the group controller is also provided with an alarm, and when the control device considers that the system is abnormal according to the feedback of various data, an alarm signal is sent to inform an operator. The alarm signal can be released manually by the operator.
with reference to fig. 1, a chilled water bypass pipeline 7 is arranged between a pipeline of the primary chilled water pump 33 for communicating the chilled water return loop 22 and a pipeline of the water chilling unit 31 for communicating the chilled water supply loop 21, and a first chilled water electric valve 71 is arranged on the chilled water bypass pipeline 7; a second chilled water electric valve 72 is provided on a pipe between a connection point of a pipe of the chiller 31 for the chilled water supply loop 21 and the chilled water bypass line 7 and the chilled water supply loop 21. The first chilled water electric valve 71 and the second chilled water electric valve 72 are respectively in line connection with a group controller of the control device, and when the water supply temperature of the refrigeration unit 3 does not reach the temperature of the cooling demand, the group controller controls the opening degrees of the first chilled water electric valve 71 and the second chilled water electric valve 72 to enable water output by the water chilling unit 31 to enter the first-stage chilled water pump 33 through the chilled water bypass pipeline 7 to realize water cooling circulation in the refrigeration unit 3 until the water supply temperature at the water outlet end of the water chilling unit 31 meets the cooling demand.
it can be seen that, in the data center cooling system, the frequency of the primary chilled water pump 33 of the refrigeration unit 3 is controlled by the flow direction and the flow rate of the water in the cold accumulation tank 5, the frequency of the secondary chilled water pump 4 is adjusted by the change demand of the terminal load, the operation mode of the cold accumulation tank 5 is completely independent of the cooling demand flow rate adjustment of the data center, the control architecture is simple, the stability and the reliability of the system operation are relatively high, and the system is convenient to maintain.
At least one water supply and return bypass pipeline 8 is further arranged between the chilled water supply loop 21 and the chilled water return loop 22, a water supply and return flowmeter 81 and a water supply and return electric valve 82 are arranged on each water supply and return bypass pipeline 8, the water supply and return flowmeter 81 is also a bidirectional flowmeter, and the water supply and return flowmeter 81 and the water supply and return electric valve 82 are respectively connected with the control device through lines. When the cold accumulation tank 5 is overhauled, the control device can control the opening degree of the water supply and return electric valve 82 according to the feedback middle finger of the water supply and return flowmeter 81 so as to ensure the normal operation of the cold supply system, facilitate the operation and maintenance personnel to carry out the overhauling work of the cold accumulation tank 5 in an organized and planned way, and do not influence the reliable operation of the system.
It should be noted that, a connection point of a pipeline of the second opening of the cold storage tank 5 for connecting the chilled water return loop 22 and the chilled water return loop 22 is located at the farthest end of a connection point of the chilled water return loop 22 and the refrigeration units 3, and since the refrigeration units 3 are provided with a plurality of pipes, a connection point of a pipeline of the chilled water return loop 22 and the chilled water return loop 22 of the cold storage tank 5 is far away from connection points of the chilled water return loop 22 and the refrigeration units 3, as shown by a point P in fig. 1, it is ensured that low-temperature water and return water coming out of the cold storage tank 5 during normal operation are uniformly mixed and then enter the water chilling unit 31 of the refrigeration unit 3, and it is avoided that the temperature of the return water entering the chilling unit 31 is low and the operation of the chiller. And the pipe diameters of the pipeline for connecting the chilled water supply loop 21, the pipeline inlet pipe for connecting the chilled water return loop 22 and the pipeline for connecting the chilled water supply loop 21 of the cold storage tank 5 and the pipeline for connecting the return loop are the same.
and, still be provided with cold-storage jar controller and a plurality of temperature sensor that are connected on cold-storage jar 5, wherein, cold-storage jar controller and crowd controller line connection, a plurality of temperature sensor evenly sets up along setting for the direction, and arbitrary two adjacent the distance between the temperature sensor is 0.5 m. The plurality of temperature sensors are used for monitoring the change of the thermocline in the cold storage tank 5 so as to measure the amount of the available chilled water in the cold storage tank 5 and feed back the measurement result to the cold storage tank controller, and the cold storage tank controller feeds back the state of the cold storage tank 5 to the group controller according to the feedback information so as to switch the operation mode of the cold storage tank 5.
for example, when the utility power failure is removed, the refrigeration unit 3 is restarted and loaded to the load before power failure, and the outlet water temperature is a set value, the data center is cooled by the refrigeration unit 3, and the cold storage tank controller sends a signal to the group controller to request to enter the super cold charging mode, as shown in fig. 3. The group controller will issue a start command to the first unit controller corresponding to the refrigeration unit 3 in the standby state to charge the cold storage tank 5 with cold. When the reading of the temperature sensor at about 10% of the distance from the top or the tail of the cold storage tank 5 is the designed backwater temperature value and the readings of the rest temperature sensors are the designed water supply temperature, the cold storage tank controller automatically exits the super cold charging mode, and the group controller sends a closing command to the first unit controller of the standby refrigerating unit 3 to close the refrigerating unit 3.
On the basis of the system architecture of the data center cooling system, an embodiment of the present invention further provides a control method for a data center cooling system, as shown in fig. 4, where the control method includes:
S1: the working state of the refrigeration unit 3 is monitored, and the monitoring of the refrigeration unit 3 in this step is group controller monitoring of the control device, mainly monitoring the power supply state of the refrigeration unit 3.
S2: judging whether the freezing unit 3 normally operates according to the working state of the freezing unit 3;
if the refrigeration unit 3 is operating normally, step S3 is executed: monitoring the flow and the flow direction of the cold accumulation tank 5 and adjusting the frequency of the primary chilled water pump 33 according to the flow and the flow direction of the cold accumulation tank 5 to supply cold to the data center;
The step S3 specifically includes the following steps:
when the water in the cold storage tank 5 flows from the first opening to the second opening, that is, the water flow direction of the cold storage tank 5 is the forward direction, the group controller of the control device controls the first electric valve 512 and the second electric valve 522 to make the flow rate of the first opening of the cold storage tank 5 greater than the flow rate of the second opening of the cold storage tank 5, and when the flow rate of the first opening of the cold storage tank 5 is greater than the set value of the forward flow rate of the second opening of the cold storage tank 5 by 0-100 3/h, the step S31 is executed, wherein the group controller of the control device controls the frequency of the primary refrigeration water pump 33 to meet the cooling demand flow rate of the data center;
When the water in the cold storage tank 5 flows from the second opening to the first opening, that is, the water flow of the cold storage tank 5 is reversed, the first flow meter 511 and the second flow meter 521 give an alarm, and step S32 is executed: and monitoring the flow difference between the second opening and the first opening, controlling the cold supply state of the freezing unit 3 by the group controller of the control device until the water in the cold accumulation tank 5 flows to the second opening from the first opening and keeps the forward direction for a set time period of 5-30min, releasing the alarm of the first flow meter 511 and the second flow meter 521, and recovering the freezing unit 3 to the previous cold supply state.
Wherein, step S32 specifically includes the following steps:
When the flow rate of the second opening of the cold storage tank 5 is greater than the flow rate of the first opening of the cold storage tank 5 by a first reverse flow set value of 0-50m 3/h and is kept for 5-30min, executing a step S321, namely adjusting the frequency of the first-stage chilled water pump 33 to be maximum by a group controller of the control device, and simultaneously alarming by the control device to inform an operator;
when the flow rate of the second opening of the cold storage tank 5 is greater than the flow rate of the first opening of the cold storage tank 5 and the second reverse flow rate set value is 50-100m 3/h and is kept for a reverse set time period of 5-30min, step S322 is executed, the group controller of the control device restarts a refrigeration unit 3 to supply cold water to the cold storage tank 5, and the refrigeration unit 3 is manually closed by an operator after the cold storage tank 5 does not generate reverse flow for 15min and the cold water is completely filled.
It should be noted that, the specific data selection of the forward flow set value, the forward set time, the first reverse flow set value, the second reverse flow set value and the reverse set time may be set individually according to the specific use environment of the system, so as to meet different cooling requirements.
If the refrigeration unit 3 is stopped, in the process, the group controller of the control device can monitor the power failure signal of the refrigeration unit 3, the refrigeration unit 3 is stopped, the second unit controller of the control device starts the secondary refrigeration water pump 4 to supply cold water in the cold storage tank 5 to the tail end water supply loop 11, the system automatically enters an emergency cold supply mode of the cold storage tank 5, and at the moment, the step S4 is executed: and monitoring the cooling demand flow of the data center, and adjusting the frequency of the secondary chilled water pump 4 and the opening degree of the tail end electric valve 61 according to the cooling demand flow so as to supply cooling to the data center.
In this mode, the first flow meter 511 and the second flow meter 521 on the pipeline of the cold storage tank 5 detect that the cold storage tank 5 has a reverse flow and alarm, and the alarm should be released.
the step S4 specifically includes the following steps:
When the required cooling flow rate is larger than the flow rate provided by the lowest operation frequency of the single two-stage chilled water pump 4, step S41 is executed: the pressure difference required by the worst-case loop of the data center is controlled by the frequency of the secondary chilled water pump 4;
When the cooling demand flow rate is less than the flow rate provided by the lowest operation frequency of the single two-stage chilled water pump 4, step S41 is executed: the pressure differential required for the worst-case loop of the data center is controlled by end electronic valve 61.
The data center is provided with a plurality of devices, cold water conveyed by the tail end water supply loop 11 needs to be subjected to heat exchange sequentially through the plurality of devices, the pressure of the cold water at the device closest to the tail end water supply loop 11 and the pressure of the cold water at the device farthest from the tail end water supply loop 11 are changed, and the pressure difference between the two points is the pressure difference required by the most unfavorable loop.
in addition, in the restarting process after the refrigeration unit 3 is stopped, the water in the refrigeration unit 3 is controlled to self-circulate to the outlet water temperature of the outlet end of the first-stage refrigeration water pump 33, which meets the water cooling requirement. In each group of refrigerating units 3, when the water supply temperature of the water chilling unit 31 exceeds the set temperature value by 2 degrees, the first unit controller controls the first chilled water electric valve 71 to be completely opened, the second chilled water electric valve 72 to be completely closed, and water output by the water chilling unit 31 completely enters the first-stage chilled water pump 33 through the chilled water bypass pipeline 7 to realize water cooling circulation in the refrigerating units 3; when the difference between the water supply temperature of the water chilling unit 31 and the set temperature value is 0.5 degrees, the first unit controller controls the first chilled water electric valve 71 to be gradually closed, the second chilled water electric valve 72 to be gradually opened, and water output by the water chilling unit 31 gradually does not enter the chilled water bypass pipeline 7 any more and starts to enter the chilled water supply loop 21. It should be noted that, in the adjusting process of the first chilled water electric valve 71 and the second chilled water electric valve 72, the flow rate through the supercooled water unit 31 needs to be monitored, and the minimum flow rate requirement of entering the water chilling unit 31 must be met.
When the mains supply fault is removed, the freezing unit 3 is restarted and loaded to the load before power failure, and the water outlet temperature is a set value, the data center is cooled by the freezing unit 3, and the cold storage tank 5 controller sends a signal to the group controller to request to enter a super-charging mode. The group controller will issue a start command to the first unit controller corresponding to the refrigeration unit 3 in the standby state to charge the cold storage tank 5 with cold. When the reading of the temperature sensor at about 10% of the distance from the top or the tail of the cold storage tank 5 is the designed backwater temperature value and the readings of the rest temperature sensors are the designed water supply temperature, the controller of the cold storage tank 5 automatically exits the super cold charging mode, and the group controller sends a closing command to the first unit controller of the standby refrigerating unit 3 to close the refrigerating unit 3.
In summary, in the present embodiment, the control of the cold storage tank 5 in the micro cooling mode, the emergency cooling mode, and the super cooling mode is completely separated from the control of the cooling demand at the end of the data center, and they do not affect each other, and the number of the switched valves is the least in the three mode control.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. a data center cooling system, comprising: the system comprises a tail end water supply loop, a tail end water return loop, a chilled water supply loop, a chilled water return loop, a plurality of freezing units, a plurality of secondary chilled water pumps, a cold accumulation tank, a flow sensor and a control device, wherein each freezing unit comprises a water chilling unit, a plate heat exchanger and a primary chilled water pump which are sequentially communicated; wherein:
the tail end water supply loop and the tail end water return loop are used for circularly supplying cold for a data center, and the tail end water return loop is communicated with the chilled water return loop; the water inlet end of each secondary chilled water pump is communicated with the chilled water supply loop, and the water outlet end of each secondary chilled water pump is communicated with the tail end water supply loop;
in each freezing unit, the water inlet end of the water chilling unit is communicated with the chilled water supply loop, and the water outlet end of the primary chilled water pump is communicated with the chilled water return loop; the secondary chilled water pump is provided with an uninterruptible power supply;
The first opening of the cold accumulation tank is communicated with the chilled water supply loop, the second opening of the cold accumulation tank is communicated with the chilled water return loop, a first flow meter and a first electric valve are arranged on a pipeline between the first opening of the cold accumulation tank and the chilled water supply loop, and a second flow meter and a second electric valve are arranged on a pipeline between the second opening of the cold accumulation tank and the chilled water return loop;
a tail end bypass pipeline is arranged between the tail end water supply loop and the chilled water return loop, and a tail end electric valve is arranged on the chilled water bypass pipeline; the flow sensor is used for monitoring the cooling demand flow of the data center;
the control device is respectively connected with the primary chilled water pump, the secondary chilled water pump, the flow sensor, the tail end electric valve, the first flow meter, the first electric valve, the second flow meter and the second electric valve through lines, so that the secondary chilled water pump and the tail end electric valve are controlled according to feedback of the flow sensor, or the primary chilled water pump is controlled according to feedback of the first flow meter and the second flow meter.
2. The data center cooling system according to claim 1, wherein the control device comprises a group controller, and a cold storage tank controller in signal connection with the group controller, two unit controllers, and both of the unit controllers are in control connection with a plurality of the secondary chilled water pumps.
3. A data center cooling system according to claim 1, wherein the group controller is further provided with an alarm.
4. a control method applied to the data center cooling system according to claims 1-3, characterized by comprising:
Monitoring the working state of the refrigeration unit;
judging whether the freezing unit normally operates according to the working state of the freezing unit;
If the refrigeration unit is in normal operation, monitoring the flow and the flow direction of the cold accumulation tank, and adjusting the frequency of the primary refrigeration water pump according to the flow and the flow direction of the cold accumulation tank so as to supply cold to the data center;
and if the refrigeration unit is shut down, monitoring the cooling demand flow of the data center, and adjusting the frequency of the secondary refrigeration water pump and the opening degree of the tail end electric valve according to the cooling demand flow so as to supply cooling to the data center.
5. The control method of claim 4, wherein the monitoring of the cooling demand flow of the data center and the adjusting of the frequency of the secondary chilled water pump and the opening of the tail end electric valve according to the cooling demand flow comprises:
When the cooling demand flow is larger than the flow provided by the lowest operation frequency of a single secondary chilled water pump, the pressure difference required by the worst loop of the data center is controlled by the frequency of the secondary chilled water pump;
when the cooling demand flow is less than the flow provided by the lowest operating frequency of the single secondary chilled water pump, the pressure differential required by the worst-case loop of the data center is controlled by the terminal electric valve.
6. the control method of claim 4, wherein the monitoring the cold storage tank flow and flow direction and adjusting the frequency of the primary chilled water pump based on the cold storage tank flow and flow direction comprises:
When the water in the cold accumulation tank flows from the first opening to the second opening and the flow of the first opening of the cold accumulation tank is larger than the flow forward flow set value of the second opening of the cold accumulation tank, controlling the frequency of the primary chilled water pump to meet the cooling demand flow of the data center;
when the water in the cold accumulation tank flows to the first opening from the second opening, the first flow meter and the second flow meter give an alarm, the flow difference between the second opening and the first opening is monitored, and the cold supply state of the refrigeration unit is controlled according to the flow difference until the water in the cold accumulation tank flows to the second opening from the first opening and keeps the positive direction for a set time.
7. The control method of claim 6, wherein controlling the cooling state of the refrigeration unit according to the magnitude of the reverse flow comprises:
when the flow of the second opening of the cold storage tank is larger than the flow of the first opening of the cold storage tank by a first reverse flow set value and is kept for a reverse set time, adjusting the frequency of the primary chilled water pump to be maximum;
And when the flow of the second opening of the cold storage tank is greater than the flow of the first opening of the cold storage tank and the second reverse flow set value, keeping the reverse set time length, and restarting the freezing unit to supply cold water for the cold storage tank.
8. The control method of claim 6, wherein the forward flow set point is 0-100 3/h and the forward set time period is 5-30 min.
9. The control method according to claim 7, characterized in that the first reverse flow value is 0-50m 3/h, the second reverse flow value is 50-100m 3/h, and the reverse set time period is 5-30 min.
10. the control method of claim 6, wherein during a restart after shutdown of the refrigeration unit:
And controlling the water in the freezing unit to self-circulate to the outlet water temperature of the outlet end of the primary freezing water pump to meet the water cooling requirement.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111010851A (en) * | 2019-12-11 | 2020-04-14 | 郑州轻工业大学 | Data center hybrid cooling system and working method thereof |
| CN111918523A (en) * | 2020-06-28 | 2020-11-10 | 北京百度网讯科技有限公司 | Refrigeration system, control method and device of refrigeration system and storage medium |
| CN112271722A (en) * | 2020-09-25 | 2021-01-26 | 科大讯飞股份有限公司 | Energy-saving adjusting method and system, electronic equipment and storage device |
| CN112539579A (en) * | 2020-12-27 | 2021-03-23 | 宁波杭州湾新区祥源动力供应有限公司 | Header system refrigerated water circulation system |
| CN113203138A (en) * | 2021-05-18 | 2021-08-03 | 恒华数字科技集团有限公司 | Energy-saving control method for refrigeration system of data center |
| CN114485002A (en) * | 2022-03-17 | 2022-05-13 | 骊阳(广东)节能科技股份有限公司 | Dual-working-condition ice storage integrated unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203010847U (en) * | 2012-11-29 | 2013-06-19 | 际高建业有限公司 | Ice storage cold supply control system |
| CN203224014U (en) * | 2012-11-29 | 2013-10-02 | 际高建业有限公司 | Ice storage control system |
| WO2013149507A1 (en) * | 2012-04-06 | 2013-10-10 | Tan Zhongxi | Central air conditioning system and control method therefor |
| CN205137770U (en) * | 2015-12-07 | 2016-04-06 | 武汉科技大学 | Full frequency conversion unsteady flow volume two stage pump system |
-
2019
- 2019-08-08 CN CN201910729236.1A patent/CN110557930B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013149507A1 (en) * | 2012-04-06 | 2013-10-10 | Tan Zhongxi | Central air conditioning system and control method therefor |
| CN203010847U (en) * | 2012-11-29 | 2013-06-19 | 际高建业有限公司 | Ice storage cold supply control system |
| CN203224014U (en) * | 2012-11-29 | 2013-10-02 | 际高建业有限公司 | Ice storage control system |
| CN205137770U (en) * | 2015-12-07 | 2016-04-06 | 武汉科技大学 | Full frequency conversion unsteady flow volume two stage pump system |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111010851A (en) * | 2019-12-11 | 2020-04-14 | 郑州轻工业大学 | Data center hybrid cooling system and working method thereof |
| CN111918523A (en) * | 2020-06-28 | 2020-11-10 | 北京百度网讯科技有限公司 | Refrigeration system, control method and device of refrigeration system and storage medium |
| CN112271722A (en) * | 2020-09-25 | 2021-01-26 | 科大讯飞股份有限公司 | Energy-saving adjusting method and system, electronic equipment and storage device |
| CN112271722B (en) * | 2020-09-25 | 2023-05-30 | 科大讯飞股份有限公司 | Energy-saving adjusting method and system, electronic equipment and storage device |
| CN112539579A (en) * | 2020-12-27 | 2021-03-23 | 宁波杭州湾新区祥源动力供应有限公司 | Header system refrigerated water circulation system |
| CN113203138A (en) * | 2021-05-18 | 2021-08-03 | 恒华数字科技集团有限公司 | Energy-saving control method for refrigeration system of data center |
| CN113203138B (en) * | 2021-05-18 | 2022-03-01 | 恒华数字科技集团有限公司 | Energy-saving control method for refrigeration system of data center |
| CN114485002A (en) * | 2022-03-17 | 2022-05-13 | 骊阳(广东)节能科技股份有限公司 | Dual-working-condition ice storage integrated unit |
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