CN116154585A - Cooling system and cooling method - Google Patents
Cooling system and cooling methodDownload PDFInfo
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- CN116154585A CN116154585ACN202211451655.1ACN202211451655ACN116154585ACN 116154585 ACN116154585 ACN 116154585ACN 202211451655 ACN202211451655 ACN 202211451655ACN 116154585 ACN116154585 ACN 116154585A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0404—Air- or gas cooling, e.g. by dry nitrogen
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0405—Conductive cooling, e.g. by heat sinks or thermo-electric elements
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0407—Liquid cooling, e.g. by water
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
Description
Technical Field
The invention belongs to the field of heat energy cooling, and particularly relates to a cooling system and a cooling method.
Background
The laser equipment, especially large-scale laser equipment, can release huge energy in the in-process of using in the short term to carry out periodic operation again after the interval is longer, in order to guarantee large-scale laser equipment's normal operating, can use proprietary cooling system to cool off large-scale laser equipment generally, however current cooling system for laser equipment is simpler in structure, the function is more single, and area is big, input power is high, can not satisfy large-scale laser equipment's different demands to the temperature under various operating modes, make large-scale laser equipment's cooling efficiency lower, influenced large-scale laser equipment's normal use.
Disclosure of Invention
The invention aims to provide a cooling system and a cooling method, which overcome the defects that the cooling system in the prior art is simple in structure and single in function, and can not meet the requirements of large-scale laser equipment on different temperatures under various working conditions.
The technical scheme of the invention is as follows:
a cooling system for heat dissipation and temperature control of a thermal load of a large laser device, the system comprising:
the refrigerating unit is used for cooling cold energy available for the heat load of the large-scale laser equipment within a specified time and radiating heat of the system into an atmospheric heat sink;
the circulating cold accumulation unit is used for storing the cold energy and conveying the cold energy to each heat load unit of the large-scale laser equipment in a form of a secondary refrigerant according to requirements;
the electronic control unit is used for monitoring the running state of the system and controlling the system according to the working mode; and also to detect if the system is normal.
Further, the refrigeration unit comprises an external plate heat exchanger, an air cooling unit, a cold accumulation circulating pump and a first liquid supply pipe network;
the air cooling unit and the external cold source plate heat exchanger are mutually standby, and waterway switching is performed through a valve;
the external plate type heat exchanger is used for exchanging heat generated by the heat load of the large-scale laser equipment to the cooling system to cool the secondary refrigerant;
the air cooling unit is used for cooling the secondary refrigerant so as to provide cold energy which meets the heat load of the large-scale laser equipment and exchange waste heat generated by the heat load into the atmosphere.
Further, the circulating cold accumulation unit comprises a cold accumulation box group, a second liquid supply pipe network, a liquid supply pump group and a temperature control plate type heat exchanger;
the cold accumulation box group is used for accumulating cold energy available for loads in a specified time;
the second liquid supply pipe network is used for connecting a heat load and a cooling system, so that the secondary refrigerant can circularly exchange heat between the heat load and the cooling system;
the liquid supply pump group is used for providing power for circulation of the secondary refrigerant between the cooling system and the load;
the temperature control plate type heat exchanger is used for heat exchange between the secondary refrigerant heated by the heat load of the large-scale laser equipment and the secondary refrigerant cooled in the cold storage water tank.
Further, the electric control unit comprises a power supply module, a monitoring module, an operation module and a control module;
the power supply module is used for providing electric energy for the electric control unit;
the monitoring module is used for monitoring temperature, flow and pressure information of the cooling system;
the operation module is used for adjusting the working mode of the cooling system by a user;
the control module is used for adjusting the temperature, flow and pressure of the cooling system according to the working mode.
A cooling method applied to the cooling system, the method comprising:
the system self-checking, checking whether the power supply, the power supply line and the power supply interface are normal; if normal, entering a control mode selection;
the control mode comprises a cold accumulation mode, a cold release mode and a standby mode;
the system automatically operates according to the selected control mode to control the temperature.
Further, the system self-checking method comprises the following steps:
checking power failure: detecting whether the power supply is normal or not, and if the power supply is normal, checking a power supply circuit;
checking a power supply line: detecting whether the indicator light is normally turned on, and checking a power interface if the indicator light is turned on;
checking a power interface: detecting whether the display of the touch screen is normal, and entering a control mode for selection if the detection is normal.
Further, the cold accumulation mode includes:
the valve at one side of the temperature control plate heat exchanger and the cold accumulation circulating pump set is controlled to be in an off state, and the valve at one side of the cold accumulation circulating pump set, which is connected with the water chilling unit, is controlled to be in an on state;
the temperature sensors arranged in the cold accumulation water tank and the emergency water tank measure the water temperature in the cold accumulation water tank, and data are collected and calculated according to a preset measurement time interval;
the water chilling unit is started to cool the cooling liquid in the emergency water tank, when the temperature of the cooling liquid in the emergency water tank is reduced to a preset cooling temperature, the three-way valve on a pipeline between the emergency water tank and the cold accumulation water tank is controlled to be switched according to the preset delay time in a delayed manner to cool the cooling liquid in the cold accumulation water tank until the calculated temperature average value of the temperature sensor arranged in the cold accumulation water tank reaches the preset cold accumulation temperature;
the control mode switches to the standby mode.
Further, the standby mode includes:
the valve at one side of the temperature control plate heat exchanger and the cold accumulation circulating pump set is controlled to be in an off state, and the valve at one side of the cold accumulation circulating pump set, which is connected with the water chilling unit, is controlled to be in an on state;
the temperature sensors arranged in the cold accumulation water tank and the emergency water tank measure the water temperature in the cold accumulation water tank, and data are collected and calculated according to a preset measurement time interval;
when the average temperature in the cold storage water tank is higher than the mode requirement temperature, the water chilling unit is started with a liquid supply pump until the temperature in the cold storage water tank reaches the mode requirement;
when the average temperature in the emergency water tank is higher than the mode requirement temperature, the system water chilling unit is started to refrigerate, and the water chilling unit is started with the liquid supply pump until the emergency water tank reaches the mode requirement temperature.
Further, the cooling-releasing mode includes:
the three-way valve on the control pipeline is opened, and the liquid supply loop forms internal circulation;
starting the water pumps in the liquid supply circulating pump group one by one; starting heaters arranged in the liquid supply circulation one by one;
when the temperature of the water discharged by the system in the liquid supply circulation reaches 18 ℃, the 1 main water pump is stopped after 15 seconds, and when the temperature of the water discharged reaches 19 ℃, the 2 nd main water pump is stopped after 15 seconds;
and when the temperature of the water discharged by the system in the liquid supply circulation reaches 20 ℃, turning off the heaters on 2 pipelines, and when the temperature of the water discharged reaches 22 ℃, turning off all the heaters and turning off all the water pumps.
Further, the control mode further includes an emergency operation mode including:
the cold accumulation circulation and the cold water unit connecting valve are in a closing state, the connecting valve between the cold accumulation circulation emergency water tank and the plate heat exchanger is opened, and the cold accumulation circulation water pump is opened;
and controlling a cold accumulation circulation side three-way valve group according to the temperature of the liquid supply at different nodes by the liquid supply circulation, and adjusting the temperature in the liquid supply circulation side water mixing tank.
The invention adopting the technical scheme has the following advantages:
the invention aims to provide a cooling system and a cooling method, which precisely control the flow of cold and hot water in a large-scale temperature-control heat exchanger based on coolant state data monitoring and information feedback, so as to realize stable and precise adjustment of the temperature of liquid supply, finally realize high-power heat dissipation and temperature control of large-scale laser equipment and ensure the normal operation of the equipment.
Drawings
The invention can be further illustrated by means of non-limiting examples given in the accompanying drawings;
fig. 1: the invention relates to a structure diagram of a cooling system;
the main reference numerals are as follows:
1. a water chiller; 2. a cold accumulation circulating pump; 3. a cold storage box group; 4. a liquid supply pump group; 5. a three-way valve; 6. a temperature-control plate heat exchanger; 7. a laser device.
Detailed Description
The present invention will be described in detail below with reference to the drawings and specific examples, and it should be noted that embodiments of the present invention and features of the embodiments may be combined with each other without conflict. In the drawings or description, like or identical parts have been given the same drawing numbers, and implementations not shown or described in the drawings are in a form known to those of ordinary skill in the art. In addition, directional terms such as "upper", "lower", "top", "bottom", "left", "right", "front", "rear", etc. in the embodiments are merely directions with reference to the drawings, and are not intended to limit the scope of the present invention.
Referring to fig. 1, a cooling system for heat dissipation and temperature control of a thermal load of a large laser device 7, the system comprising:
a refrigerating unit for accumulating cold energy available for the thermal load of the large-scale laser device 7 and radiating the heat of the system into an atmospheric heat sink in a prescribed time; the refrigerating unit comprises a plate heat exchanger, an air cooling unit, a cold accumulation circulating pump 2 and a liquid supply pipe network; the plate heat exchanger is used for exchanging heat generated by the heat load of the large-scale laser equipment 7 to the cooling system; cooling the secondary refrigerant;
the air cooling unit is used for cooling the secondary refrigerant to provide a cold carrier liquid which meets the heat load of the large-scale laser equipment 7 and exchanges waste heat generated by the heat load into the atmosphere.
The heat exchange mainly comprises heat exchange between external chilled water and water stored in the cold storage box group 3, heat exchange between the air cooling module and the cold storage box group 3 and heat exchange between a cold storage water tank and a mixed water tank of the cold storage box group 3. In the embodiment, the external chilled water and the water stored in the cold accumulation box group 3 preferably exchange heat through the plate heat exchanger, and the rated heat exchange quantity which can be realized under the condition of the standard flow of the circulating water is not less than 500kW, so that the cold recovery requirement is met. The pressure difference between the external chilled water and the water stored in the cold storage box group 3 and the water inlet and outlet of the internal and external loops of the plate heat exchanger between the air cooling module and the cold storage box group 3 is not more than 0.1MPa.
The refrigeration unit specifically comprises: the device comprises an air cooling unit, an external plate heat exchanger, a cold accumulation circulating pump 2 and a liquid supply pipe network. The air cooling unit and the external plate heat exchanger of the refrigeration unit are mutually standby, and waterway switching is carried out through a valve. The air cooling unit is connected with the inlet of the cold accumulation circulating pump 2 through a metal pipeline, and the cold accumulation water tank is connected with the outlet of the cold accumulation circulating pump 2 through a metal pipeline; the cold accumulation circulating pump 2 sends the secondary refrigerant in the cold accumulation water tank to the air cooling unit, and the secondary refrigerant flows back to the cold accumulation water tank after heat exchange is completed, so that cold energy storage of the secondary refrigerant in the cold accumulation water tank is completed.
The hot side of the external plate heat exchanger is connected with the inlet of the cold accumulation circulating pump 2 through a metal pipeline, and the cold accumulation water tank is connected with the outlet of the cold accumulation circulating pump 2 through a metal pipeline; the cold accumulation circulating pump 2 sends the secondary refrigerant in the cold accumulation water tank to the hot side of the external cold source plate heat exchanger, and the secondary refrigerant flows back to the cold accumulation water tank after heat exchange is completed, so that cold energy storage of the secondary refrigerant in the cold accumulation water tank is completed.
The air cooling unit in the embodiment comprises a compressor, a condenser, a liquid storage device, an expansion valve, an evaporator, a gas-liquid separator, a high-pressure protector, a low-pressure protector and a water cooling unit. The air cooling unit adjusts the electric valve, the compressor and the fan according to the load working condition and the liquid supply temperature requirement.
The circulating cold accumulation unit is used for storing the cold energy and conveying the secondary refrigerant to each heat load unit of the large-scale laser equipment 7 according to the requirement; the circulating cold accumulation unit comprises a cold accumulation box group 3, a liquid supply pipe network and a liquid supply pump group 4; the cold accumulation box group 3 is used for accumulating cold energy available for a load in a specified time; the liquid supply pipe network is used for connecting a heat load and a cooling system, so that the cold carrier liquid can exchange heat between the heat load and the cooling system in a circulating way; the liquid supply pump group 4 is used for providing power for the circulation of the cold carrier liquid between the liquid cooling unit and the load.
In this embodiment, the circulating cold storage unit specifically includes a cold storage box, a water mixing box, a circulating pump set, a plate heat exchanger, a liquid supply network pipe, an electric heater, a filter, an instrument and an electric three-way valve 5.
The circulation unit adopts a closed circulation system to supply liquid, the liquid supply loop and the secondary refrigerant in the water mixing tank obtain circulation power from the main circulation pump, and after the secondary refrigerant absorbs waste heat in the load, the secondary refrigerant flows through the large temperature control plate heat exchanger 6 to exchange heat with cold storage water in the cold storage water tank.
The main pipeline is provided with a pressure transmitter, a temperature transmitter and a flow transmitter to monitor the pressure, the flow and the temperature state of the system in real time. And a main filter is arranged at the water outlet of the main circulating pump and is used for filtering impurities in the cooling water. The loop is connected with a water mixing tank in series, and firstly, the water mixing tank is matched with an internal heating device to carry out secondary adjustment on the temperature of the secondary refrigerant, and secondly, the water mixing tank keeps constant pressure for the system and can absorb the volume change of the secondary refrigerant in the system, thereby ensuring the normal operation of the whole system.
The electronic control unit is used for monitoring the running state of the system and controlling the system according to the working mode adjusted by a user; and is also used for detecting whether the system is normal or not; the electric control unit comprises a power supply module, a monitoring module, an operation module and a control module; the power supply module is used for providing electric energy for the electric control unit; the monitoring module is used for monitoring temperature, flow and pressure information of the cooling system; the operation module is used for adjusting the working mode of the cooling system by a user; the control module is used for adjusting the temperature, flow and pressure of the cooling system according to the working mode.
In this embodiment, the electronic control unit specifically includes a PLC, an I/O module, a low-voltage control device, a control cabinet, and the like; the electric control unit starts and stops the equipment, switches modes and stops the equipment in an emergency; the PLC is used for sampling temperature, pressure and flow signals and adjusting a controlled object water pump, a compressor, a fan, an electric valve (a three-way valve 5, a bypass valve and a liquid supply valve) and an electric heater pipe, so that the temperature, the pressure and the flow of the system are adjusted; meanwhile, the currently set working mode and the control instruction of the touch display screen are judged, compared and processed, and corresponding relays and alternating current contactors are controlled under different working conditions, so that the action of executing mechanisms such as a water pump, a compressor, an electric valve and electric heating is controlled, and the recording, displaying and storing of data are completed. In this embodiment, the PLC preferably uses Siemens S7-1500.
Based on coolant state data monitoring and information feedback, the system precisely controls the flow of cold and hot water in the large temperature-controlled heat exchanger, so that stable and precise adjustment of liquid supply temperature is realized, high-power heat dissipation and temperature control of laboratory products are finally realized, and normal operation of the system is ensured.
When the system works normally, the secondary refrigerant of the liquid supply loop obtains circulating power from the main circulating pump, absorbs waste heat in the load, and then exchanges heat with cold storage water in the cold storage water tank through the large temperature control plate type heat exchanger 6. The control module feeds back important requirements such as liquid supply temperature of laboratory heat load according to the received fluid state information, fluid flow entering the plate heat exchanger and a bypass loop thereof is regulated by controlling the proportional valve, the secondary refrigerant enters the water mixing tank after heat exchange of the plate heat exchanger, the water mixing tank and the heating device can regulate secondary refrigerant, the secondary refrigerant meeting the requirements of temperature, flow and pressure is continuously fed into the laboratory heat load, and continuous heat dissipation and temperature control of the secondary refrigerant in the required working time are ensured. When the equipment is in standby, when the water temperature of the system is lower than the use temperature requirement, the secondary refrigerant in the loop can be heated by the electric heater to realize temperature rise; when the water temperature of the system exceeds the use requirement, the external constant-temperature cooling water is used for circulating heat exchange or refrigerating equipment such as an air cooling module is used for refrigerating again.
In the embodiment, the full-load (including the power consumption transmitted to the medium by a circulating water pump) power consumption 1844kW of the laser equipment 7, the rated flow of the liquid supply 620m3/h, the cold storage target temperature 5 ℃, the liquid supply temperature 22+/-1 ℃ and the total cold storage water amount 35m3; refrigerating by adopting an air cooling unit, wherein the target cold storage temperature is 5 ℃, the highest temperature of a cold storage end plate exchange inlet is 19.0 ℃, and the medium is glycol water solution with the volume concentration of 22%; under the full-load working condition of the laser load, the cold accumulation device can continuously provide full-flow stable liquid supply for not less than 10min, and the temperature of the water inlets of all the branches is ensured to be within the range of 22+/-1 ℃ in the liquid supply temperature control process.
According to the formula q1=p1t1 (1)
Q1-total heat of full load of the laser device 7 kJ;
p1—full load power consumption of the laser device 7, kW;
t1-liquid supply time, S;
(1) In the formula, the full-load power consumption P1=1844 kW of the laser device 7, and the liquid supply time T1=10min=600S; the full load total heat q1=p1t1= 1106400 kj= 1106.4MJ of the laser device 7;
according to the formula q1=cρvΔt (2)
Q1-maximum cold accumulation and cooling capacity, kJ;
c-specific heat capacity. kJ/kg DEG C
Rho-medium density, kg/m3 ；
V-total cold storage water volume, m3 ；
Delta t-maximum temperature difference for cold accumulation, DEG C;
(2) Wherein the specific heat capacity of the medium C=kJ/kg·deg.C, the density of the medium ρ= 1038.92kg/m3 Total cold-storage water volume v=35m3 Maximum available temperature difference Δt=maximum available liquid supply temperature 19 ℃ -cold storage minimum temperature 5 ℃ =14 ℃;
q1=cρvΔt
＝3.764*1038.92*35*14
≈1916.14MJ
(2) The formula Q2 > (1) the formula Q1, so that the total cold accumulation meets the use requirement.
The air-cooled refrigeration is adopted to refrigerate water in the cold accumulation water tank, when the initial temperature of the heat preservation cold accumulation water tank is equal to the highest temperature of the environment of 45 ℃, the temperature is required to be reduced to within 5+/-1 ℃ within 7 hours, the condensation temperature is 60 ℃ and the temperature difference between the evaporation temperature and the water outlet temperature is 5 ℃, the refrigeration capacity at different water temperatures can be calculated, and the temperature difference is 1 ℃ to be used as the temperature difference calculation interval.
According to manufacturer data, the maximum evaporating temperature of the compressor is 10 ℃, an expansion valve with a MOP function can be adopted, the evaporating temperature is kept at 10 ℃ when the water temperature is high, and the evaporating temperature changes along with the change of the water temperature after the water temperature is reduced. Therefore, the cooling process can be roughly divided into two parts, namely a constant evaporation temperature stage and a variable evaporation temperature stage, and according to fitting parameters and calculation, MATLAB software calculation results are as follows:
i＝1；
tc＝60；
time1＝0；
time2＝0；
forto＝10:-1:0
y(i)＝394946+16249.71*to-2611.78*tc+244.712*to*to-142.057*to*tc-15.032*t
c*tc+1.3963*to*to*to-1.5827*tc*to*to+0.3807*to*tc*tc+0.0612*tc*tc*tc；
i＝i+1；
end；
q1＝34*1035*3.8*1000；
time1＝1.2*q*30/300000；
for i＝1:11
time2＝time2+1.2*q/y(i)；
end；
time＝time1+time2
wherein tc represents the condensing temperature, the condensing temperature is set to 60 ℃ through MOP adjustment, t0 represents the evaporating temperature, y represents the test fit refrigerating capacity corresponding to the evaporating temperature and different condensing temperatures of the compressor, and q1 is 34m3 The water temperature of the cold accumulation amount changes by 1 ℃ of heat; time is the total time for reaching the target temperature, time1 is the temperature reduction time of the stage of the constant evaporation temperature of the compressor at 10 ℃; time2 is the cooling time of the compressor in the phase of changing the evaporating temperature; according to fitting parameters and calculation, MATLAB software calculates to obtain the total time time= 23286S when the target temperature is reached, the water temperature in the water tank can be reduced to 5 ℃, and the requirement of no more than 8h is met.
In some large-scale laser devices 7, the cold accumulation device is required to continuously provide full-flow stable liquid supply for not less than 10min, and the temperature of the water inlets of all branches is required to be ensured to be within the range of 22+/-1 ℃ in the liquid supply temperature control process. The temperature of the cold accumulation loop gradually rises in the liquid supply time, the total power consumption of the system is large, the required flow is large, and if the liquid supply temperature is regulated by adopting a direct water mixing mode, the liquid supply temperature can be greatly fluctuated; therefore, a plate heat exchanger for temperature control is added between the liquid supply loop and the cold accumulation loop, the control module adjusts the fluid flow entering the plate heat exchanger and the bypass loop thereof through the control proportional valve according to the important requirements of temperature information feedback of the received cold accumulation liquid supply medium, the fluid flow entering the mixed water tank after heat exchange of the plate heat exchanger, the mixed water tank and the heating device can carry out secondary adjustment on the refrigerating fluid, the refrigerating fluid meeting the requirements of temperature, flow and pressure is continuously fed into the laboratory for heat load, and continuous heat dissipation and temperature control of the refrigerating fluid in the required working time are ensured.
When the liquid supply temperature is required to be stable within 10min, the heat release Q3 at the hot side of the plate heat exchanger=the heat absorption Q4 at the cold storage cold side;
according to formula Q3 ＝qV1 CρΔt2 ＝qV1 Cρ(TT10-TT11)； (3)
Q4 ＝qV2 CρΔt3 ＝qV2 CρΔ(TT15-TT14)； (4)
(3) In formula (4), qV1 For flow rate of hot side, i.e. liquid supply side, qV2 The flow rate of the cold accumulation loop flowing through the cold side of the plate heat exchanger; Δt (delta t)2 Is the temperature difference between the inlet temperature TT10 and the outlet temperature TT11 at the hot side3 Is the temperature difference between the temperature TT15 of the cold side of the cold storage loop flowing through the plate heat exchanger and the outlet temperature TT14 of the cold side.
Q is obtainable from (3) and (4)V1 (TT10-TT11)＝qV2 (TT 15-TT 14); the temperature TT15 of the cold accumulation loop flowing through the cold side of the plate heat exchanger changes along with the change of time, so as to keep the heat absorption and the heat release of two sides equal; the target flow rate qV needs to be controlled2 Determining the opening of the three-way valve 5 according to a relation curve (data obtained through experiments) of the target flow and the opening of the three-way valve 5; compared with PID temperature control logic, the temperature control logic has the advantages of simple functional relation and no risk of overrun caused by hysteresis.
Compared with the prior art, the cooling system can timely control the air cooling unit and the plate heat exchanger by monitoring state information such as liquid supply temperature in real time, so that the refrigerating medium meeting the requirements of temperature, flow and pressure is continuously fed into a heat load, and the efficient heat dissipation and temperature control effects are realized.
The invention provides a cooling method which is applied to the cooling system, and the method comprises the following steps:
the system self-checking, checking whether the power supply, the power supply line and the power supply interface are normal; if normal, entering a control mode selection; the control mode comprises a cold accumulation mode, a cold release mode and a standby mode; the system automatically operates according to the selected control mode to control the temperature.
Checking power failure: detecting whether the power supply is normal or not, and if the power supply is normal, checking a power supply circuit;
checking a power supply line: detecting whether the indicator light is normally turned on, and checking a power interface if the indicator light is turned on;
checking a power interface: detecting whether the display of the touch screen is normal, and entering a control mode for selection if the detection is normal.
The cold accumulation mode includes:
the valve at one side of the cold accumulation circulation, which is connected with the plate heat exchanger and the cold accumulation circulation pump 2, is controlled to be in a closing state, and the valve at one side of the cold accumulation circulation, which is connected with the water chilling unit 1, is controlled to be in an opening state;
the temperature sensors arranged in the cold accumulation water tank and the emergency water tank measure the water temperature in the cold accumulation water tank, and data are collected and calculated according to a preset measurement time interval; due to the setting of the preset measurement time interval, the energy consumption of the temperature sensor is reduced, the reliability of the temperature sensor is improved, and the accuracy of monitoring data is improved;
the water chilling unit 1 is started, cooling liquid in the emergency water tank is cooled, and when the temperature of the cooling liquid in the emergency water tank is reduced to a preset cooling temperature, the three-way valve 5 on a pipeline between the emergency water tank and the cold storage water tank is controlled to be switched according to a preset delay time to cool the cooling liquid in the cold storage water tank; the delay control can avoid the influence of false triggering on heat dissipation and temperature control effects due to the fact that the temperature of the local cooling liquid is too low, and when the average calculated temperature value of the temperature sensor arranged in the cold accumulation water tank reaches the preset cold accumulation temperature; the control mode switches to the standby mode.
In this embodiment, the preset cold storage temperature is preferably 5 ℃ or 11 ℃ according to the use condition of the common large-scale laser device 7, so that the use requirement can be met, and meanwhile, the efficiency of heat dissipation and temperature control can be improved.
The standby mode includes:
the valve at one side of the cold accumulation circulation, which is connected with the plate heat exchanger and the cold accumulation circulation pump 2, is controlled to be in a closing state, and the valve at one side of the cold accumulation circulation, which is connected with the water chilling unit 1, is controlled to be in an opening state;
the temperature sensors arranged in the cold accumulation water tank and the emergency water tank measure the water temperature in the cold accumulation water tank, and data are collected and calculated according to a preset measurement time interval; due to the setting of the preset measurement time interval, the energy consumption of the temperature sensor is reduced, the reliability of the temperature sensor is improved, and the accuracy of monitoring data is improved;
when the average temperature in the cold storage water tank is higher than the mode requirement temperature, the water chilling unit 1 is started with a liquid supply pump until the temperature in the cold storage water tank reaches the mode requirement;
when the average temperature in the emergency water tank is higher than the mode requirement temperature, the system water chilling unit 1 is started to refrigerate, the water chilling unit 1 is started with a liquid supply pump, and the system water chilling unit is stopped when the emergency water tank reaches the mode requirement temperature.
In this example, the mode required temperature is 5+1.5deg.C or 11+1.5deg.C.
The cooling mode comprises the following steps:
in the liquid supply circulation, a three-way valve 5 arranged on an indoor pipeline is opened, and the liquid supply loop forms an internal circulation;
starting the water pumps in the liquid supply circulating pump group one by one; starting heaters arranged in the liquid supply circulation one by one;
when the temperature of the water discharged by the system in the liquid supply circulation reaches 18 ℃, the 1 main water pump is stopped after 15 seconds, and when the temperature of the water discharged reaches 19 ℃, the 2 nd main water pump is stopped after 15 seconds;
and when the temperature of the water discharged by the system in the liquid supply circulation reaches 20 ℃, turning off the heaters on 2 pipelines, and when the temperature of the water discharged reaches 22 ℃, turning off all the heaters and turning off all the water pumps.
Basic principle: after the cold storage temperature meets the requirement, when the system formally works, the liquid supply loop and the secondary refrigerant in the water mixing tank acquire circulating power from the main circulating pump, and after the secondary refrigerant absorbs waste heat in the load, the secondary refrigerant flows through the large temperature control plate heat exchanger 6 to exchange heat with cold storage water in the cold storage water tank. The control module feeds back important requirements such as liquid supply temperature of laboratory heat load according to the received fluid state information, fluid flow entering the plate heat exchanger and a bypass loop thereof is regulated by controlling the proportional valve, the secondary refrigerant enters the water mixing tank after heat exchange of the plate heat exchanger, the water mixing tank and the heating device can regulate secondary refrigerant, and the secondary refrigerant meeting the requirements of temperature, flow and pressure is continuously fed into the laboratory heat load.
The control mode further includes an emergency operation mode including:
the cold accumulation circulation and the cold water unit 1 are in a closed state, the connecting valve between the cold accumulation circulation emergency water tank and the plate heat exchanger is opened, and the cold accumulation circulation water pump is opened;
the liquid supply circulation controls the three-way valve 5 group at the cold accumulation circulation side according to the temperature of the liquid supply at different nodes, and the temperature in the liquid supply circulation side water mixing tank is regulated.
The method comprises the following steps:
a) And in the cold accumulation circulation, the opening of the three-way valve 5 groups is comprehensively judged according to the difference value of the water outlet temperature of the liquid supply circulation system and the water return temperature of the liquid supply circulation system and the water temperature of the inlet of the plate heat exchanger (the cold accumulation circulation side), and is divided into 6 initial flow openings, and then the real-time opening adjustment is carried out according to the outlet of the plate heat exchanger (the liquid supply circulation side). The specific adjustment mode is set according to the performance curve function of the plate heat exchanger.
b) The outlet temperature (liquid supply circulation side) of the plate heat exchanger and the outlet temperature of the mixed water tank are used for controlling a heater in the mixed water tank to thermally compensate the cooling after the plate heat exchanger is cooled; the temperature of the outlet (the liquid supply circulation side) of the plate heat exchanger is increased along with the decrease of the temperature, and the temperature of the outlet water of the mixed water tank is decreased along with the increase of the temperature of the outlet water of the mixed water tank, so that the temperature of the outlet water of the liquid supply circulation is finally ensured to meet 22+/-1 ℃. The specific adjustment mode should be set according to the function determined by the test
In the mode, the power device is started for 30 seconds and then stopped, the heater is stopped immediately if running, the three-way valve 5 on the liquid supply circulation pipeline is reset, so that the liquid supply circulation forms an internal loop, 2 water pumps in the 3 water pumps in the liquid supply circulation pump set normally run for 2 times, and the other water pump is stopped after running for 30 seconds.
After all the water pumps of the liquid supply circulation are stopped, the cold accumulation circulating water pump stops running, and the pipeline valve of the plate heat exchanger is turned off.
And after the cold accumulation circulating water pump stops running, delaying the system to enter the cold accumulation circulation for 1 minute.
The cooling system and the cooling method provided by the invention are described in detail. The description of the specific embodiments is only intended to aid in understanding the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (10)
1. A cooling system for heat dissipation and temperature control of a thermal load of a large laser device (7), the system comprising:
a refrigeration unit for cooling the cold energy available for the thermal load of the large laser device (7) and for dissipating the heat of the system into an atmospheric heat sink within a prescribed time;
the circulating cold accumulation unit is used for storing the cold energy and conveying the cold energy to each heat load unit of the large-scale laser equipment (7) in the form of a secondary refrigerant according to the requirement;
the electronic control unit is used for monitoring the running state of the system and controlling the system according to the working mode; and also to detect if the system is normal.
2. A cooling system according to claim 1, characterized in that:
the refrigerating unit comprises a water chilling unit (1), a cold accumulation circulating pump (2) and a first liquid supply pipe network;
the water chilling unit (1) comprises an external plate heat exchanger and an air cooling unit;
the air cooling unit and the external cold source plate heat exchanger are mutually standby, and waterway switching is performed through a valve;
the external plate type heat exchanger is used for exchanging heat generated by the heat load of the large-scale laser equipment (7) to the cooling system so as to cool the secondary refrigerant;
the air cooling unit is used for cooling the secondary refrigerant so as to provide cold energy which meets the use of the heat load of the large-scale laser equipment (7), and exchange waste heat generated by the heat load into the atmosphere.
3. A cooling system according to claim 1, characterized in that:
the circulating cold accumulation unit comprises a cold accumulation box group (3), a second liquid supply pipe network, a liquid supply pump group (4) and a temperature control plate type heat exchanger; the cold accumulation box group (3) is used for accumulating cold energy available for a load in a specified time;
the second liquid supply pipe network is used for connecting a heat load and a cooling system, so that the secondary refrigerant can circularly exchange heat between the heat load and the cooling system;
the liquid supply pump set (4) is used for providing power for circulation of the secondary refrigerant between the cooling system and the load;
the temperature control plate type heat exchanger is used for heat exchange between the secondary refrigerant heated by the heat load of the large-scale laser equipment (7) and the secondary refrigerant cooled in the cold storage water tank.
4. A cooling system according to claim 1, characterized in that:
the electric control unit comprises a power supply module, a monitoring module, an operation module and a control module;
the power supply module is used for providing electric energy for the electric control unit;
the monitoring module is used for monitoring temperature, flow and pressure information of the system;
the operation module is used for adjusting the working mode of the cooling system by a user;
the control module is used for adjusting the temperature, flow and pressure of the system according to the working mode.
5. A cooling method for use in a cooling system, the method comprising:
the system self-checking, checking whether the power supply, the power supply line and the power supply interface are normal; if normal, entering a control mode selection;
the control mode comprises a cold accumulation mode, a cold release mode and a standby mode;
the system automatically operates according to the selected control mode to control the temperature.
6. A cooling method according to claim 5, wherein the system self-test method comprises:
checking power failure: detecting whether the power supply is normal or not, and if the power supply is normal, checking a power supply circuit;
checking a power supply line: detecting whether the indicator light is normally turned on, and checking a power interface if the indicator light is turned on;
checking a power interface: detecting whether the display of the touch screen is normal, and entering a control mode for selection if the detection is normal.
7. A cooling method according to claim 5, wherein the cold storage mode comprises:
the valve at one side of the control temperature plate type heat exchanger (6) and the cold accumulation circulating pump (2) is controlled to be in an off state, and the valve at one side of the water chilling unit (1) connected with the cold accumulation circulating pump is controlled to be in an on state;
the temperature sensors arranged in the cold accumulation water tank and the emergency water tank measure the water temperature in the cold accumulation water tank, and data are collected and calculated according to a preset measurement time interval;
the water chilling unit (1) is started to cool the cooling liquid in the emergency water tank, when the temperature of the cooling liquid in the emergency water tank is reduced to a preset cooling temperature, the three-way valve (5) on a pipeline between the emergency water tank and the cold accumulation water tank is controlled to be switched according to the preset delay time to cool the cooling liquid in the cold accumulation water tank until the average value of the calculated temperature of the temperature sensor arranged in the cold accumulation water tank reaches the preset cold accumulation temperature;
the control mode switches to the standby mode.
8. A cooling method according to claim 5, wherein the standby mode comprises:
the valve at one side of the control temperature plate type heat exchanger (6) and the cold accumulation circulating pump (2) is controlled to be in an off state, and the valve at one side of the water chilling unit (1) connected with the cold accumulation circulating pump is controlled to be in an on state;
the temperature sensors arranged in the cold accumulation water tank and the emergency water tank measure the water temperature in the cold accumulation water tank, and data are collected and calculated according to a preset measurement time interval;
when the average temperature in the cold storage water tank is higher than the mode requirement temperature, the water chilling unit (1) is started with a liquid supply pump until the temperature in the cold storage water tank reaches the mode requirement;
when the average temperature in the emergency water tank is higher than the mode requirement temperature, the system water chilling unit (1) is started to refrigerate, and the water chilling unit (1) is started with the liquid supply pump until the emergency water tank reaches the mode requirement temperature.
9. A cooling method according to claim 5, wherein the cooling mode comprises:
a three-way valve (5) on the control pipeline is opened, and the liquid supply loop forms internal circulation;
starting the water pumps in the liquid supply circulating pump group one by one; starting heaters arranged in the liquid supply circulation one by one;
when the temperature of the water discharged by the system in the liquid supply circulation reaches 18 ℃, the 1 main water pump is stopped after 15 seconds, and when the temperature of the water discharged reaches 19 ℃, the 2 nd main water pump is stopped after 15 seconds;
and when the temperature of the water discharged by the system in the liquid supply circulation reaches 20 ℃, turning off the heaters on 2 pipelines, and when the temperature of the water discharged reaches 22 ℃, turning off all the heaters and turning off all the water pumps.
10. The cooling method of claim 5, wherein the control mode further comprises an emergency operation mode, the emergency operation mode comprising:
the cold accumulation circulation and the cold water unit (1) are in a closed state, the connecting valve between the cold accumulation circulation emergency water tank and the plate heat exchanger is opened, and the cold accumulation circulation water pump is opened;
the liquid supply circulation controls the three-way valve (5) group at the cold accumulation circulation side according to the temperature of the liquid supply at different nodes, and the temperature in the liquid supply circulation side water mixing tank is regulated.
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| CN202211451655.1ACN116154585A (en) | 2022-11-21 | 2022-11-21 | Cooling system and cooling method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117979661A (en)* | 2024-03-29 | 2024-05-03 | 苏州元脑智能科技有限公司 | Liquid cooling circulation liquid supply system and liquid cooling circulation liquid supply method |
| CN119093137A (en)* | 2024-09-04 | 2024-12-06 | 无锡冠亚恒温制冷技术有限公司 | A dual-pump temperature control system with cold storage function for laser and control method thereof |
| CN119521635A (en)* | 2025-01-20 | 2025-02-25 | 常州博瑞电力自动化设备有限公司 | A water cooling system and control method |
| CN119882677A (en)* | 2025-01-06 | 2025-04-25 | 中国船舶集团有限公司第七〇九研究所 | Test device, test method and heat dissipation system of LCU control system |
- 2022
- 2022-11-21CNCN202211451655.1Apatent/CN116154585A/enactivePending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117979661A (en)* | 2024-03-29 | 2024-05-03 | 苏州元脑智能科技有限公司 | Liquid cooling circulation liquid supply system and liquid cooling circulation liquid supply method |
| CN117979661B (en)* | 2024-03-29 | 2024-06-07 | 苏州元脑智能科技有限公司 | Liquid cooling circulation liquid supply system and liquid cooling circulation liquid supply method |
| CN119093137A (en)* | 2024-09-04 | 2024-12-06 | 无锡冠亚恒温制冷技术有限公司 | A dual-pump temperature control system with cold storage function for laser and control method thereof |
| CN119882677A (en)* | 2025-01-06 | 2025-04-25 | 中国船舶集团有限公司第七〇九研究所 | Test device, test method and heat dissipation system of LCU control system |
| CN119521635A (en)* | 2025-01-20 | 2025-02-25 | 常州博瑞电力自动化设备有限公司 | A water cooling system and control method |
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