CN117346369A - Cooling system and control method thereof - Google Patents

Cooling system and control method thereof Download PDF

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Publication number
CN117346369A
CN117346369A CN202311452032.0A CN202311452032A CN117346369A CN 117346369 A CN117346369 A CN 117346369A CN 202311452032 A CN202311452032 A CN 202311452032A CN 117346369 A CN117346369 A CN 117346369A
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CN
China
Prior art keywords
cooling system
liquid supply
cooling
load
deltat
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CN202311452032.0A
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Chinese (zh)
Inventor
符爽莹
张田田
钟志成
黄章义
杨凯翟
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202311452032.0A priority Critical patent/CN117346369A/en
Publication of CN117346369A publication Critical patent/CN117346369A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/005—Compression machines, plants or systems with non-reversible cycle of the single unit type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a cooling system and a control method thereof, wherein the cooling system comprises: a water cooling unit; the cooling flow path comprises a liquid supply section and a liquid return section, one end of the liquid supply section is connected with a cooling water outlet of the evaporator, the other end of the liquid supply section is connected with a liquid supply port of the load, one end of the liquid return section is connected with a liquid return port of the load, and the other end of the liquid return section is connected with a cooling water return port of the evaporator and is used for cooling the load by adopting cooling water after heat exchange with the evaporator; the first bypass flow path is arranged in parallel with the liquid supply section and is used for directly bypassing the cooling water outlet of the evaporator to a liquid supply port of a load; and the second bypass flow path is used for bypassing the cooling water outlet of the evaporator to the cooling water return port of the evaporator. The invention solves the problem that the cooling equipment cannot respond in time to the large fluctuation of the liquid supply temperature when the thermal load of the equipment to be cooled changes in the prior art, realizes the accurate control of the liquid supply temperature, and ensures the running stability of the equipment to be cooled.

Description

Cooling system and control method thereof
Technical Field
The invention relates to the technical field of cooling, in particular to a cooling system and a control method thereof.
Background
Some precision instruments and devices need to be used in a stable low-temperature or constant-temperature environment, and heat generated by the instruments and devices is usually taken away by cooling water with proper temperature and flow rate provided by the devices to be cooled, and meanwhile the devices are ensured to be in the constant-temperature environment, so that the temperature of liquid supply of the devices to be cooled needs to be kept constant.
However, in the actual running process, since the equipment may be in an intermittent working state, and the number and types of actual opening are also changed, that is, the thermal load of the equipment to be cooled is changed randomly, when the refrigerating capacity of the cooling unit is fixed, the liquid return temperature and the liquid supply temperature of the equipment to be cooled are also changed, and a constant temperature environment cannot be created for the precise equipment.
Aiming at the problem that the cooling equipment cannot respond in time to the large fluctuation of the temperature of the liquid supply caused by the change of the thermal load of the equipment to be cooled in the related technology, no effective solution is proposed at present.
Disclosure of Invention
The invention provides a cooling system and a control method thereof, which at least solve the problem that the cooling equipment cannot respond in time to cause larger fluctuation of the temperature of liquid supply when the thermal load of the equipment to be cooled changes in the prior art.
To solve the above technical problem, according to an aspect of an embodiment of the present invention, there is provided a cooling system including: the water cooling unit comprises a compressor, a condenser, a throttling device and an evaporator which are sequentially connected; the cooling flow path comprises a liquid supply section and a liquid return section, one end of the liquid supply section is connected with a cooling water outlet of the evaporator, the other end of the liquid supply section is connected with a liquid supply port of the load, one end of the liquid return section is connected with a liquid return port of the load, and the other end of the liquid return section is connected with a cooling water return port of the evaporator and is used for cooling the load by adopting cooling water after heat exchange with the evaporator; the first bypass flow path is arranged in parallel with the liquid supply section and is used for directly bypassing the cooling water outlet of the evaporator to a liquid supply port of a load; and the second bypass flow path is used for bypassing the cooling water outlet of the evaporator to the cooling water return port of the evaporator.
Further, the method further comprises the following steps: the inlet of the three-way valve is connected with the cooling water outlet of the evaporator, the first outlet of the three-way valve is connected with the liquid supply port of the load, the second outlet of the three-way valve is connected with the cooling water return port of the evaporator and is used for bypassing the cooling water of the evaporator to the liquid supply port of the load and/or the cooling water return port of the evaporator, or bypassing part of the cooling water of the liquid return port of the load to the liquid supply port of the load.
Further, the method further comprises the following steps: the bypass pump is positioned on a pipeline between a first outlet of the three-way valve and a first connecting point, wherein the first connecting point is positioned on the liquid supply section, and the first outlet of the three-way valve is connected with a liquid supply port of a load through the first connecting point; the one-way valve is positioned on a pipeline between a second outlet of the three-way valve and a second connecting point, wherein the second connecting point is positioned on the liquid return section, and the second outlet of the three-way valve is connected with a cooling water return port of the evaporator through the second connecting point.
Further, the method further comprises the following steps: the liquid storage tank is positioned on the liquid supply section and used for storing cooling water of the cooling flow path; and the liquid supply pump is positioned on the liquid supply section and is used for adjusting the cooling water flow of the liquid supply section.
According to another aspect of the embodiments of the present invention, there is provided a cooling system control method applied to a cooling system as described above, the method including: acquiring real-time operation parameters of a load every preset time interval; determining whether the refrigerating capacity of the cooling system needs to be regulated according to the real-time operation parameters; if so, current operating parameters of the cooling system are adjusted, otherwise, current operating parameters of the cooling system are maintained.
Further, the real-time operating parameters include at least: the temperature of the liquid returns in real time; determining whether the cooling capacity of the cooling system needs to be adjusted according to the real-time operation parameters comprises: calculating a temperature difference delta T between the real-time liquid return temperature obtained each time and a preset liquid supply temperature; and comparing the temperature difference delta T acquired before and after the temperature difference delta T to determine whether the refrigerating capacity of the cooling system needs to be regulated.
Further, comparing the temperature difference Δt obtained from the two previous and subsequent steps to determine whether the cooling capacity of the cooling system needs to be adjusted, including: calculating the difference between the temperature difference DeltaT obtained before and afterΔt ', wherein Δt' = Δt i -△T i-1 The method comprises the steps of carrying out a first treatment on the surface of the Determining the refrigerating capacity of a cooling system without regulation when-n is less than or equal to delta T1 and less than or equal to delta T' is less than or equal to delta 0T1, wherein n is a coefficient, and delta 1T1 is the preset temperature difference precision; and determining that the refrigerating capacity of the cooling system needs to be regulated when DeltaT '< -n is DeltaT 1 or DeltaT' > n is DeltaT 1, wherein the refrigerating capacity of the cooling system needs to be reduced when DeltaT '< -n is DeltaT 1, and the refrigerating capacity of the cooling system needs to be increased when DeltaT' > n is DeltaT 1.
Further, adjusting current operating parameters of the cooling system includes: the operation frequency of a compressor of the cooling system is regulated, so that the refrigerating capacity of the cooling system is quickly close to the required refrigerating capacity; re-acquiring real-time operation parameters of the load, and determining whether further adjustment of the cooling system is required according to the real-time operation parameters; when the cooling system needs to be further regulated, the operation frequency of the compressor of the cooling system and the on-off of the first bypass flow path and the second bypass flow path are regulated according to a preset rule.
Further, adjusting an operating frequency of a compressor of the cooling system includes: when the refrigerating capacity of the cooling system needs to be reduced, controlling the compressor to reduce the frequency to a first preset frequency; wherein the first preset frequency f1= Δt i /△T i-1 ×F i-1 ，△T i /△T i-1 Is the ratio between the temperature difference DeltaT obtained from the two times before and after, F i-1 Is the operating frequency of the previous compressor; when the refrigerating capacity of the cooling system needs to be improved, controlling the compressor to be increased to a second preset frequency; wherein the second preset frequency f2= Δt i /△T1×F 0 ，△T i For the current temperature difference, deltaT 0 When the required refrigeration capacity of the load is satisfied, the temperature difference value between the liquid return temperature of the load and the preset liquid supply temperature, F 0 Is the rated operating frequency of the compressor.
Further, the real-time operating parameters include at least: the temperature of the liquid supply is real-time; determining whether further adjustments to the cooling system are needed based on the real-time operating parameters includes: at the real-time liquid supply temperature T Feed device When the following conditions are satisfied, it is determined that the cooling system does not need to be advancedOne-step adjustment: t (T) 0 -1/2△T2≤T Feed device ≤T 0 +1/2 DeltaT 2, otherwise, determining that further adjustments to the cooling system are required; wherein T is 0 And presetting the accuracy of the liquid supply temperature for the preset liquid supply temperature delta T2.
Further, when the refrigerating capacity of the cooling system needs to be reduced, the operation frequency of the compressor of the cooling system and the on-off of the first bypass flow path and the second bypass flow path are adjusted according to a preset rule, and the method comprises the following steps: when T is Feed device ＞T 0 +1/2 DeltaT 2, the compressor continues to increase in frequency at the preset frequency until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2 DeltaT2; when T is Feed device ＜T 0 -1/2 DeltaT 2, the compressor is controlled to continue to reduce the frequency according to the preset frequency until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2 DeltaT2; t is still detected when the compressor has been reduced to the lowest frequency Feed device ＜T 0 -1/2 Δt2, controlling the three-way valve to open, the inlet of the three-way valve communicating with the first outlet, and controlling the bypass pump to open.
Further, when the refrigerating capacity of the cooling system needs to be improved, the operation frequency of the compressor of the cooling system and the on-off of the first bypass flow path and the second bypass flow path are adjusted according to a preset rule, and the method comprises the following steps: when T is Feed device ＜T 0 -1/2 DeltaT 2, the compressor is controlled to continue to reduce the frequency according to the preset frequency until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2 DeltaT2; when T is Feed device ＞T 0 +1/2 DeltaT 2, the compressor continues to increase in frequency at the preset frequency until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2 DeltaT2; when the compressor has risen to the highest frequency but still detects T Feed device ＞T 0 When +1/2 delta T2, the three-way valve is controlled to be opened, the first outlet and the second outlet of the three-way valve are communicated, and the bypass pump is controlled to be opened; after the bypass pump is started, if T is still detected Feed device ＞T 0 And +1/2 delta T2, the inlet of the three-way valve is controlled to be communicated with the first outlet and the second outlet.
Further, before acquiring the real-time operation parameters of the load at each preset time interval, the method further comprises: and determining the required refrigeration capacity of the load, and controlling the operation of the cooling system according to the initial operation parameters until the required refrigeration capacity of the load is satisfied.
Further, the interval preset time t is calculated by the following formula: t=q Cold accumulation /(Pmax-Pmin), where Q Cold accumulation The rated cold accumulation amount of the liquid storage tank is Pmax which is the maximum refrigerating capacity of the cooling system, and Pmin which is the minimum refrigerating capacity of the cooling system.
According to yet another aspect of embodiments of the present invention, there is provided a storage medium containing computer executable instructions for performing a cooling system control method as described above when executed by a computer processor.
According to the cooling system provided by the invention, the first bypass flow path and the second bypass flow path are arranged in addition to the cooling flow path, so that the cooling water outlet of the evaporator is directly bypassed to the liquid supply port of the load or the cooling water return port of the evaporator, the cooling capacity adjusting range of the cooling system is expanded through the arrangement of the bypass flow path, the cooling capacity can be adjusted according to the requirement, the refrigerating capacity can be adjusted according to the change of the heat load, the liquid supply temperature can be accurately controlled, and the running stability of equipment to be cooled is ensured.
Drawings
FIG. 1 is a schematic diagram of an alternative configuration of a cooling system according to an embodiment of the present invention;
FIG. 2 is an alternative flow chart of a cooling system control method according to an embodiment of the invention;
FIG. 3 is another alternative flow chart of a cooling system control method according to an embodiment of the invention.
Reference numerals illustrate:
1. a compressor; 2. a condenser; 3. a throttle device; 4. an evaporator; 5. a load; 51. a liquid supply port for the load; 52. a liquid return port of the load; 6. a three-way valve; 61. an inlet of the three-way valve; 62. a first outlet of the three-way valve; 63. a second outlet of the three-way valve; 7. a bypass pump; 8. a one-way valve; 9. a liquid storage tank; 10. a liquid supply pump; 11. a low voltage switch; 12. a high voltage switch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" generally includes at least two.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the controllers in the embodiments of the present invention, these controllers should not be limited to these terms. These terms are only used to distinguish between controllers connected to different devices. For example, a first controller may also be referred to as a second controller, and similarly, a second controller may also be referred to as a first controller, without departing from the scope of embodiments of the invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or device comprising such element.
Alternative embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
In a preferred embodiment 1 of the present invention, a cooling system is provided, and in particular, fig. 1 shows an alternative structural schematic diagram of the cooling system, as shown in fig. 1, the cooling system includes:
the water cooling unit comprises a compressor 1, a condenser 2, a throttling device 3 and an evaporator 4 which are connected in sequence;
the cooling flow path comprises a liquid supply section and a liquid return section, wherein one end of the liquid supply section is connected with a cooling water outlet of the evaporator 4, the other end of the liquid supply section is connected with a liquid supply port 51 of a load, one end of the liquid return section is connected with a liquid return port 52 of the load, and the other end of the liquid return section is connected with a cooling water return port of the evaporator 4 and is used for cooling the load 5 by adopting cooling water subjected to heat exchange with the evaporator 4;
a first bypass flow path, which is arranged in parallel with the liquid supply section and is used for directly bypassing the cooling water outlet of the evaporator 4 to the liquid supply port 51 of the load;
and a second bypass flow path for bypassing the cooling water outlet of the evaporator 4 to the cooling water return port of the evaporator 4.
In the above embodiment, a cooling system is provided, in which, in addition to the cooling flow path, a first bypass flow path and a second bypass flow path are further provided, so that the cooling water outlet of the evaporator is directly bypassed to the liquid supply port of the load or to the cooling water return port of the evaporator, and by setting the bypass flow path, the cooling capacity adjusting range of the cooling system is expanded, and the cooling capacity can be adjusted as required, thereby adjusting the refrigerating capacity according to the change of the heat load, and realizing precise control of the liquid supply temperature.
As shown in fig. 1, further includes: the three-way valve 6, the inlet 61 of the three-way valve is connected with the cooling water outlet of the evaporator 4, the first outlet 62 of the three-way valve is connected with the liquid supply port 51 of the load, the second outlet 63 of the three-way valve is connected with the cooling water return port of the evaporator 4, and the three-way valve is used for bypassing the cooling water of the evaporator 4 to the liquid supply port 51 of the load and/or the cooling water return port of the evaporator 4, or bypassing part of the cooling water of the liquid return port 52 of the load to the liquid supply port 51 of the load. By bypassing the cooling water of the evaporator 4 to the liquid supply port 51 of the load, the liquid supply temperature can be reduced, and by bypassing the cooling water of the evaporator 4 to the cooling water return port of the evaporator 4, the temperature of the cooling liquid entering the plate change can be reduced. By bypassing a small amount of liquid return with higher temperature to the liquid supply port, the liquid supply temperature can be increased.
Furthermore, the method further comprises: a bypass pump 7 located in the line between the first outlet 62 of the three-way valve and a first connection point, wherein the first connection point is located on the liquid supply section, the first outlet 62 of the three-way valve being connected to the liquid supply port 51 of the load via the first connection point; the one-way valve 8 is positioned on a pipeline between a second outlet 63 of the three-way valve and a second connecting point, wherein the second connecting point is positioned on the liquid return section, and the second outlet 63 of the three-way valve is connected with a cooling water return port of the evaporator 4 through the second connecting point.
The cooling flow path is further provided with: a liquid storage tank 9 which is positioned on the liquid supply section and is used for storing cooling water of the cooling flow path; the liquid supply pump 10 is positioned on the liquid supply section and is used for adjusting the cooling water flow rate of the liquid supply section.
Optionally, the system liquid supply port and the liquid return port are provided with temperature sensors, and the water cooling unit is also provided with a low-voltage switch and a high-voltage switch.
Example 2
In a preferred embodiment 2 of the present invention, there is provided a cooling system control method applied to the cooling system in the above-described embodiment 1. Specifically, fig. 2 shows an alternative flow chart of the method, as shown in fig. 2, comprising the following steps S202-S206:
s202: acquiring real-time operation parameters of a load every preset time interval;
s204: determining whether the refrigerating capacity of the cooling system needs to be regulated according to the real-time operation parameters;
s206: if so, current operating parameters of the cooling system are adjusted, otherwise, current operating parameters of the cooling system are maintained.
In the above embodiment, a cooling system is provided, in which, in addition to the cooling flow path, a first bypass flow path and a second bypass flow path are further provided, so that the cooling water outlet of the evaporator is directly bypassed to the liquid supply port of the load or to the cooling water return port of the evaporator, and by setting the bypass flow path, the cooling capacity adjusting range of the cooling system is expanded, and the cooling capacity can be adjusted as required, thereby adjusting the refrigerating capacity according to the change of the heat load, and realizing precise control of the liquid supply temperature.
Before the real-time operation parameters of the load are acquired at preset time intervals, the method further comprises the following steps: and determining the required refrigeration capacity of the load, and controlling the operation of the cooling system according to the initial operation parameters until the required refrigeration capacity of the load is satisfied. When the cooling unit starts to operate, the electric three-way valve is in a closed state, and the bypass branch is not circulated. The compressor being rated at a frequency F 0 And (3) operating to enable the measured liquid supply temperature to reach the set target liquid supply temperature as soon as possible. And when the actually measured liquid supply temperature reaches the set liquid supply temperature, entering a precise temperature control program.
Detecting the liquid return temperature at the moment, namely the real-time operation parameters at least comprise: the temperature of the liquid returns in real time; determining whether the cooling capacity of the cooling system needs to be adjusted according to the real-time operation parameters comprises: calculating a temperature difference delta T between the real-time liquid return temperature obtained each time and the preset liquid supply temperature, and taking the temperature difference delta T as a reference for measuring whether the thermal load changes or not; and comparing the temperature difference delta T acquired before and after the temperature difference delta T to determine whether the refrigerating capacity of the cooling system needs to be regulated. The refrigerating capacity required to be output by each time unit can be Q Demand for ＝cm△T i Calculating the demand quantity Qdemand and DeltaT at each moment due to the relatively stable specific heat capacity and flow of the cooling liquid i Proportional to the ratio. Each of whichDelta T detected at one time i Will be available for the temperature difference DeltaT detected from the previous moment i-1 In contrast, if the two variable quantities are larger, the heat load is changed greatly, and the output refrigerating capacity of the cooling unit needs to be adjusted.
Specifically, comparing the temperature difference Δt obtained from two times before and after, to determine whether the cooling capacity of the cooling system needs to be adjusted, including: calculating a difference DeltaT 'between temperature differences DeltaT acquired before and after two times, wherein DeltaT' = DeltaT i -△T i-1 The method comprises the steps of carrying out a first treatment on the surface of the Determining the refrigerating capacity of a cooling system without regulation when-n is less than or equal to delta T1 and less than or equal to delta T' is less than or equal to n, wherein n is a coefficient, and delta T1 is the preset temperature difference precision; the refrigerating capacity of the unit is not greatly changed, and the compressor keeps running at the current frequency and continuously detects the difference between the liquid return temperature and the set target liquid supply temperature.
And determining that the refrigerating capacity of the cooling system needs to be regulated when DeltaT '< -n is DeltaT 1 or DeltaT' > n is DeltaT 1, wherein the refrigerating capacity of the cooling system needs to be reduced when DeltaT '< -n is DeltaT 1, and the refrigerating capacity of the cooling system needs to be increased when DeltaT' > n is DeltaT 1.
After determining that the refrigerating capacity of the cooling system needs to be adjusted, adjusting the current operation parameters of the cooling system comprises the following steps: the operation frequency of a compressor of the cooling system is regulated, so that the refrigerating capacity of the cooling system is quickly close to the required refrigerating capacity; this belongs to the coarse tuning step. Re-acquiring real-time operation parameters of the load, and determining whether further adjustment of the cooling system is required according to the real-time operation parameters; this belongs to the fine tuning step. When the cooling system needs to be further regulated, the operation frequency of the compressor of the cooling system and the on-off of the first bypass flow path and the second bypass flow path are regulated according to a preset rule.
Preferably, adjusting the operating frequency of the compressor of the cooling system comprises: when the refrigerating capacity of the cooling system needs to be reduced, controlling the compressor to reduce the frequency to a first preset frequency; wherein the first preset frequency f1= Δt i /△T i-1 ×F i-1 ，△T i /△T i-1 Is the ratio between the temperature difference DeltaT obtained from the two times before and after, F i-1 For the previous compressorAn operating frequency; when the refrigerating capacity of the cooling system needs to be improved, controlling the compressor to be increased to a second preset frequency; wherein the second preset frequency f2= Δt i /△T1×F 0 ，△T i For the current temperature difference, deltaT 0 When the required refrigeration capacity of the load is satisfied, the temperature difference value between the liquid return temperature of the load and the preset liquid supply temperature, F 0 Is the rated operating frequency of the compressor.
Furthermore, the real-time operating parameters include at least: the temperature of the liquid supply is real-time; determining whether further adjustments to the cooling system are needed based on the real-time operating parameters includes: at the real-time liquid supply temperature T Feed device When the following conditions are met, it is determined that no further adjustment of the cooling system is necessary: t (T) 0 -1/2△T2≤T Feed device ≤T 0 +1/2 DeltaT 2, otherwise, determining that further adjustments to the cooling system are required; wherein T is 0 And presetting the accuracy of the liquid supply temperature for the preset liquid supply temperature delta T2.
When the refrigerating capacity of the cooling system needs to be reduced, the operation frequency of the compressor of the cooling system and the on-off of the first bypass flow path and the second bypass flow path are regulated according to a preset rule, and the method comprises the following steps: when T is Feed device ＞T 0 +1/2 DeltaT 2, the compressor continues to increase in frequency at the preset frequency until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2 DeltaT2; when T is Feed device ＜T 0 -1/2 DeltaT 2, the compressor is controlled to continue to reduce the frequency according to the preset frequency until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2 DeltaT2; t is still detected when the compressor has been reduced to the lowest frequency Feed device ＜T 0 -1/2 Δt2, controlling the three-way valve to open, the inlet of the three-way valve communicating with the first outlet, and controlling the bypass pump to open.
When the refrigerating capacity of the cooling system needs to be improved, the operation frequency of the compressor of the cooling system and the on-off of the first bypass flow path and the second bypass flow path are regulated according to a preset rule, and the method comprises the following steps: when T is Feed device ＜T 0 -1/2 DeltaT 2, the compressor is controlled to continue to reduce the frequency according to the preset frequency until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2 DeltaT2; when T is Feed device ＞T 0 +1/2 DeltaT 2, the compressor continues to increase in frequency at the preset frequency until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2 DeltaT2; when the compressor has risen to the highest frequency but still detects T Feed device ＞T 0 When +1/2 delta T2, the three-way valve is controlled to be opened, the first outlet and the second outlet of the three-way valve are communicated, and the bypass pump is controlled to be opened; after the bypass pump is started, if T is still detected Feed device ＞T 0 And +1/2 delta T2, the inlet of the three-way valve is controlled to be communicated with the first outlet and the second outlet.
In a preferred embodiment of the present invention, the preset time t is calculated by the following formula: t=q Cold accumulation /(Pmax-Pmin), where Q Cold accumulation The rated cold accumulation amount of the liquid storage tank is Pmax which is the maximum refrigerating capacity of the cooling system, and Pmin which is the minimum refrigerating capacity of the cooling system. The liquid storage tank can be selected as a water tank, and when the volume of the water tank is V, the capacity of the water tank is Q Cold water =cmΔt2, where c is the specific heat capacity of the coolant and m is the actual flow of coolant.
In a preferred embodiment 2 of the present invention, there is also provided another cooling system control method, specifically, fig. 3 shows an alternative flowchart of the method, as shown in fig. 3, which includes the following steps S302-S329:
s301: starting up;
s302: the compressor operates at a rated frequency F0; the compressor being rated at a frequency F 0 And (3) operating to enable the measured liquid supply temperature to reach the set target liquid supply temperature as soon as possible. When the actually measured liquid supply temperature reaches the set liquid supply temperature, entering a precise temperature control program;
S303：T feed device If the set target temperature is reached, the step S304 is entered, otherwise, the step S302 is returned;
s304: detecting DeltaT 0 (△T 0 =initial return-set feed temperature); detecting the liquid return temperature at the moment, and calculating the temperature difference delta T between the liquid return temperature and the set liquid supply temperature at the moment 0 (△T 0 Return temperature T Returning to -setting the liquid supply temperature T 0 ) Taking the measured value as a reference for measuring whether the thermal load changes or not;
s305: detecting DeltaT i (Δti=real-time return-to-set feed temperature); detecting the temperature difference delta T between the current set liquid supply temperature and the real-time liquid return temperature at intervals of T i The interval detection time t is determined according to the cold accumulation capacity of the water tank, the maximum value Pmax and the minimum value Pmin of the heat load, and t=Q Cold accumulation /(Pmax-Pmin). The refrigerating capacity required to be output by each time unit can be Q Demand for ＝cm△T i Calculating the required quantity Q at each moment due to the relatively stable specific heat capacity and flow of the cooling liquid Demand for And DeltaT i Proportional to the ratio. Deltat detected at each time i Will be available for the temperature difference DeltaT detected from the previous moment i-1 Compared with the prior art, if the variation of the heat load and the heat load is larger, the output refrigerating capacity of the cooling unit needs to be adjusted;
S306：△T i-1 -1/2△T1≤△T i ≤△T i-1 +1/2 Δt1? If yes, go to step S307, otherwise, go to S308 or S319;
s307: the compressor operates at the current frequency;
S308：△T i ＜△T i-1 -1/2△T1；
s309: the compressor is down-converted to DeltaT i /△T i-1 ×F i-1 Therefore, the output refrigerating capacity of the cooling unit can be quickly adjusted to be close to the required refrigerating capacity;
s310: detecting actual measurement T Feed device ；
S311：T 0 -1/2△T2≤T Feed device ≤T 0 +1/2 DeltaT 2, if yes, go to step S312, otherwise, go to S313 or S317;
s312: the compressor operates at the current frequency;
S313：△T feed device ＜△T 0 -1/2△T2；
S314: the compressor reduces the frequency Δf; the compressor continues to downshift at a rate of ΔF per second until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2△T2；
S315: the compressor has been reduced to a minimum frequency;
s316: a liquid return bypass; if the compressor has been reduced to the lowest frequency but T is still detected Feed device ＜T 0 -1/2 Δt, opening the electric three-way valve, starting the pump located on the bypass branch, bypassing a small amount of the liquid return with higher temperature to the liquid supply port, and adjusting the bypass flow by adjusting the rotational speed of the pump, so as to increase the liquid supply temperature;
S317：T feed device ＞△T 0 +1/2△T2；
S318: the compressor boost frequency Δf; the compressor is ramped up at a rate of ΔF per second until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2△T2；
S319：△T i ＞△T 0 +1/2△T2；
S320: the compressor is up-converted to DeltaT i /△T 0 ×F 0 ；
S321: detecting actual measurement T Feed device ；
S322：T 0 -1/2△T2≤T Feed device ≤T 0 +1/2 DeltaT 2, if yes, go to step S323, otherwise, go to S324 or S326;
s323: the compressor operates at the current frequency;
S324：△T feed device ＜△T 0 -1/2△T2；
S325: the compressor decreases the frequency ΔF, and the compressor continues to decrease frequency at a rate ΔF per second until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2△T2；
S326：T Feed device ＞△T 0 +1/2△T2；
S327: the compressor increases the frequency DeltaF, and the compressor continues to increase the frequency DeltaF per second until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2△T2；
S328: the compressor has risen to the highest frequency;
s329: a liquid supply bypass; if the compressor has risen to the highest frequency but T is still detected Feed device ＞T 0 The electric three-way valve is opened when +1/2 delta T2 is reached, the pump on the bypass branch is opened, and a small amount of liquid with lower temperature from the evaporator is directly bypassed to the liquid supply port, thereby reducingThe temperature of the liquid supply is still detected after bypass Feed device ＞T 0 And +1/2 delta T2, the electric three-way valve is adjusted to be communicated with all three ports, a part of liquid supply with lower temperature which is exchanged from the plate is mixed with the liquid return, the temperature of the cooling liquid which enters the plate exchange is reduced, and a part of liquid supply is mixed with the liquid supply, so that the liquid supply temperature is further reduced.
Under the condition of random change of heat load, the refrigerating capacity of the unit is too low or interference is caused, and then the liquid supply temperature output by the unit is high and low. The common technical scheme is that cooling liquid with different temperatures is bypassed for mixing, so that the cooling liquid with stable temperature can be output after the thermal load changes.
The invention considers that the temperature of the liquid return from the heat load changes along with the change of the heat load, calculates the difference between the real-time liquid return temperature and the set liquid supply temperature, estimates the refrigeration capacity required to be output by the current refrigeration system according to Q=cm delta t, and then adjusts the frequency of the compressor according to the required refrigeration capacity. Because the specific heat capacity and the flow of the cooling liquid are relatively stable, the required refrigerating capacity mainly looks at Deltat, the ratio of Deltat before and after Deltat can be calculated every certain time, then the frequency of the compressor is adjusted (coarse adjustment) according to the ratio, then the frequency of the compressor is further adjusted (fine adjustment) according to the difference value between the measured liquid supply temperature after preliminary adjustment and the set liquid supply temperature, when the heat load is ensured to be changed in the above way, the output refrigerating capacity of the compressor can be quickly and automatically adjusted, so that the output refrigerating capacity of the compressor can be matched with the current heat load, and therefore, the unit can output the cooling liquid with stable liquid supply temperature under the condition of the heat load change.
Example 3
Based on the cooling system control method provided in the above-described embodiment 2, there is also provided in a preferred embodiment 3 of the present invention a storage medium containing computer-executable instructions for performing the cooling system control method as described above when executed by a computer processor.
In the above embodiment, a cooling system is provided, in which, in addition to the cooling flow path, a first bypass flow path and a second bypass flow path are further provided, so that the cooling water outlet of the evaporator is directly bypassed to the liquid supply port of the load or to the cooling water return port of the evaporator, and by setting the bypass flow path, the cooling capacity adjusting range of the cooling system is expanded, and the cooling capacity can be adjusted as required, thereby adjusting the refrigerating capacity according to the change of the heat load, and realizing precise control of the liquid supply temperature.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (15)

1. A cooling system, comprising:
the water cooling unit comprises a compressor (1), a condenser (2), a throttling device (3) and an evaporator (4) which are connected in sequence;
the cooling flow path comprises a liquid supply section and a liquid return section, one end of the liquid supply section is connected with a cooling water outlet of the evaporator (4), the other end of the liquid supply section is connected with a liquid supply port (51) of a load, one end of the liquid return section is connected with a liquid return port (52) of the load, and the other end of the liquid return section is connected with a cooling water return port of the evaporator (4) and is used for cooling the load (5) by adopting cooling water after heat exchange with the evaporator (4);
a first bypass flow path which is arranged in parallel with the liquid supply section and is used for directly bypassing the cooling water outlet of the evaporator (4) to a liquid supply port (51) of the load;
and the second bypass flow path is used for bypassing the cooling water outlet of the evaporator (4) to the cooling water return port of the evaporator (4).
2. The cooling system of claim 1, further comprising:
the three-way valve (6), the entry (61) of three-way valve with the cooling water delivery port of evaporimeter (4) is connected, the first export (62) of three-way valve with the feed liquor mouth (51) of load, the second export (63) of three-way valve with the cooling water return mouth of evaporimeter (4) is connected, is used for with the cooling water bypass of evaporimeter (4) to feed liquor mouth (51) of load and/or the cooling water return mouth of evaporimeter (4), or will the partial cooling water bypass of return liquor mouth (52) of load to feed liquor mouth (51) of load.
3. The cooling system of claim 2, further comprising:
a bypass pump (7) located on a line between a first outlet (62) of the three-way valve and a first connection point, wherein the first connection point is located on the liquid supply section, and the first outlet (62) of the three-way valve is connected with a liquid supply port (51) of the load through the first connection point;
the one-way valve (8) is positioned on a pipeline between a second outlet (63) of the three-way valve and a second connecting point, wherein the second connecting point is positioned on the liquid return section, and the second outlet (63) of the three-way valve is connected with a cooling water return port of the evaporator (4) through the second connecting point.
4. The cooling system of claim 1, further comprising:
a liquid storage tank (9) which is positioned on the liquid supply section and is used for storing cooling water of the cooling flow path;
and the liquid supply pump (10) is positioned on the liquid supply section and is used for adjusting the cooling water flow of the liquid supply section.
5. A cooling system control method applied to the cooling system according to any one of claims 1 to 4, characterized by comprising:
acquiring real-time operation parameters of the load every preset time;
determining whether the refrigerating capacity of the cooling system needs to be adjusted according to the real-time operation parameters;
if so, adjusting the current operating parameters of the cooling system, otherwise, maintaining the current operating parameters of the cooling system.
6. The method of claim 5, wherein the real-time operating parameters include at least: the temperature of the liquid returns in real time; determining whether the refrigeration capacity of the cooling system needs to be adjusted according to the real-time operation parameters comprises the following steps:
calculating a temperature difference delta T between the real-time liquid return temperature obtained each time and a preset liquid supply temperature;
and comparing the temperature difference delta T acquired before and after the temperature difference delta T to determine whether the refrigerating capacity of the cooling system needs to be regulated.
7. The method of claim 6, wherein comparing the temperature difference Δt obtained two times before and after to determine whether the cooling capacity of the cooling system needs to be adjusted, comprises:
calculating a difference DeltaT 'between the temperature differences DeltaT acquired before and after two times, wherein DeltaT' = DeltaT i -△T i-1 ；
Determining that the refrigerating capacity of the cooling system does not need to be regulated when-n is less than or equal to delta T1 and less than or equal to delta T' is less than or equal to n is delta T1, wherein n is a coefficient, and delta T1 is the preset temperature difference precision;
and determining that the refrigerating capacity of the cooling system needs to be regulated when DeltaT '< -n is DeltaT 1 or DeltaT' > n is DeltaT 1, wherein the refrigerating capacity of the cooling system needs to be reduced when DeltaT '< -n is DeltaT 1, and the refrigerating capacity of the cooling system needs to be improved when DeltaT' > n is DeltaT 1.
8. The method of claim 6, wherein adjusting current operating parameters of the cooling system comprises:
adjusting the operating frequency of a compressor of the cooling system to enable the refrigerating capacity of the cooling system to be quickly close to the required refrigerating capacity;
re-acquiring real-time operation parameters of the load, and determining whether further adjustment of the cooling system is required according to the real-time operation parameters;
when the cooling system needs to be further regulated, the operation frequency of the compressor of the cooling system and the on-off of the first bypass flow path and the second bypass flow path are regulated according to a preset rule.
9. The method of claim 8, wherein adjusting an operating frequency of a compressor of the cooling system comprises:
when the refrigerating capacity of the cooling system needs to be reduced, controlling the compressor to reduce the frequency to a first preset frequency; wherein the first preset frequency f1= Δt i /△T i-1 ×F i-1 ，△T i /△T i-1 For the ratio between the temperature differences DeltaT obtained from the two previous and subsequent times, F i-1 Is the operating frequency of the compressor of the previous time;
when the refrigerating capacity of the cooling system needs to be improved, controlling the compressor to be increased to a second preset frequency; wherein the second preset frequency f2= Δt i /△T1×F 0 ，△T i For the current temperature difference, deltaT 0 When the required refrigeration capacity of the load is satisfied, a temperature difference value F between the liquid return temperature of the load and the preset liquid supply temperature 0 Is the rated operating frequency of the compressor.
10. The method of claim 8, wherein the real-time operating parameters include at least: the temperature of the liquid supply is real-time; determining whether further adjustments to the cooling system are required based on the real-time operating parameters, including:
at the real-time liquid supply temperature T Feed device When the following conditions are met, it is determined that no further adjustment of the cooling system is required: t (T) 0 -1/2△T2≤T Feed device ≤T 0 +1/2 DeltaT 2, otherwise, determining that further adjustment of the cooling system is required; wherein T is 0 And for the preset liquid supply temperature, deltaT 2 is the precision of the preset liquid supply temperature.
11. The method of claim 10, wherein adjusting the operating frequency of the compressor of the cooling system and the on-off of the first bypass flow path and the second bypass flow path according to a preset rule when the cooling capacity of the cooling system needs to be reduced, comprises:
when T is Feed device ＞T 0 +1/2 DeltaT 2, the compressor continues to increase the frequency at the preset frequency until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2△T2；
When T is Feed device ＜T 0 -1/2 Δt2, controlling the compressor to continue down-converting at a preset frequency until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2△T2；
T is still detected when the compressor has been reduced to a minimum frequency Feed device ＜T 0 -1/2 Δt2, controlling the three-way valve to open, the inlet of the three-way valve communicating with the first outlet, and controlling the bypass pump to open.
12. The method of claim 10, wherein adjusting the operating frequency of the compressor of the cooling system and the on-off of the first bypass flow path and the second bypass flow path according to a preset rule when the cooling capacity of the cooling system needs to be increased, comprises:
when T is Feed device ＜T 0 -1/2 Δt2, controlling the compressor to continue down-converting at a preset frequency until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2△T2；
When T is Feed device ＞T 0 +1/2 DeltaT 2, the compressor continues to increase the frequency at the preset frequency until T is detected 0 -1/2△T2≤T Feed device ≤T 0 +1/2△T2；
When the compressor has risen to the highest frequency but is still detectedT Feed device ＞T 0 When +1/2 delta T2, the three-way valve is controlled to be opened, the first outlet and the second outlet of the three-way valve are communicated, and the bypass pump is controlled to be opened;
after the bypass pump is started, if T is still detected Feed device ＞T 0 And +1/2 delta T2, controlling the inlet of the three-way valve to be communicated with the first outlet and the second outlet.
13. The method of claim 5, further comprising, prior to said acquiring real-time operating parameters of said load at each preset time interval:
and determining the required refrigeration capacity of the load, and controlling the operation of the cooling system according to the initial operation parameters until the required refrigeration capacity of the load is satisfied.
14. The method of claim 5, wherein the interval preset time t is calculated by the formula: t=q Cold accumulation /(Pmax-Pmin), where Q Cold accumulation And Pmax is the maximum refrigerating capacity of the cooling system, and Pmin is the minimum refrigerating capacity of the cooling system.
15. A storage medium containing computer executable instructions, which when executed by a computer processor are for performing the cooling system control method of any one of claims 5 to 14.
CN202311452032.0A 2023-11-02 2023-11-02 Cooling system and control method thereof Pending CN117346369A (en)

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Application Number Priority Date Filing Date Title
CN202311452032.0A CN117346369A (en) 2023-11-02 2023-11-02 Cooling system and control method thereof

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