CN111121356A - Industrial circulating cooling water energy-saving system and method based on central cooling system - Google Patents
Industrial circulating cooling water energy-saving system and method based on central cooling system Download PDFInfo
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- CN111121356A CN111121356A CN201911136592.9A CN201911136592A CN111121356A CN 111121356 A CN111121356 A CN 111121356A CN 201911136592 A CN201911136592 A CN 201911136592A CN 111121356 A CN111121356 A CN 111121356A
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/001—Arrangement or mounting of control or safety devices for cryogenic fluid systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention discloses an industrial circulating cooling water energy-saving system and method based on a central cooling system. Belongs to the technical field of energy management and energy conservation. The cooling system mainly solves the problems that an existing machine room cooling system and a motor cooling system cannot be in coupling connection, and therefore energy consumption is high and cooling effect is poor. It is mainly characterized in that: the system comprises a machine room cooling system, a motor cooling system, a cold accumulator, a water storage tank, a cooling water tank, a refrigerating unit, a temperature regulating water tank and a heater; aiming at the phenomenon that the water temperatures in the water storage tank and the outlet of the cooling water tank are changed due to seasonal changes, five corresponding circulating cooling paths are arranged according to different water temperature ranges in the water storage tank and the outlet of the cooling water tank, so that the purposes of peak clipping and valley filling, environmental cooling capacity and system waste heat utilization are achieved. The invention has the advantages of convenient adjustment, stable operation and obvious electricity saving.
Description
Technical Field
The invention belongs to the technical field of energy management and energy conservation, and particularly relates to an industrial circulating cooling water energy-saving system and method based on a central cooling system.
Background
Currently, the problem of energy shortage becomes a global problem restricting industrial development, in the energy consumption of China, the industry is a big household of the energy consumption of China, the energy consumption accounts for about 70% of the total energy consumption of China, and the development of the traditional high-energy-resource consumption and extensive industrial control management is difficult to continue. For a strategy, coupling and connecting a plurality of systems to realize advantage complementation is a trend of energy saving development, such as a relatively mature combined heat and power system.
For production enterprises, places and equipment such as machine rooms, power distribution rooms, motors, water pumps and the like need to be cooled. Some enterprises adopt one air conditioner to cool a machine room, a power distribution room and the like respectively, the method is simple and rough, and compared with a central cooling system, peak clipping and valley filling cannot be realized through a cold accumulator to save electricity charges. Some enterprises, although using central cooling systems, still have their refrigeration units turned on during the transition season, and cannot utilize natural cooling.
In winter, even in the north, the machine room and the power distribution room still have a large amount of waste heat and still need to be cooled. However, in winter, the temperature of the cooling water is very low without using a refrigerating unit, and in order to prevent the phenomenon that the temperature in the machine room and the distribution room is too low, the cooling water needs to be heated and the temperature of the cooling water needs to be controlled. This heating process consumes electrical energy.
In addition, in enterprises, electromechanical equipment such as motors and water pumps often have the phenomenon of forced shutdown due to the rise of the temperature of the machine in hot summer due to the reduction of the cooling effect, especially some old equipment.
Disclosure of Invention
The invention provides an industrial circulating cooling water energy-saving system and method based on a central cooling system, aiming at the problems in the prior art, a machine room, a power distribution room and the like are in a central cooling mode and are in coupling connection with cooling systems of equipment such as a motor, a water pump and the like, and the temperature condition is matched with a corresponding circulating cooling path through temperature monitoring, so that the energy conservation is realized, and the cooling effect of electromechanical equipment is improved.
In order to achieve the purpose, the technical solution adopted by the energy-saving system of the invention is as follows: including computer lab class cooling system, motor class cooling system, regenerator, storage water tank, coolant tank and refrigerating unit, regenerator, computer lab class cooling system, storage water tank and refrigerating unit connect and constitute first circulative cooling route, its characterized in that: the device also comprises a temperature regulating water tank and a heater; the cooling water tank is connected with the motor cooling system to form a second circulating cooling path; the cold accumulator, the machine room cooling system, the water storage tank, the refrigerating unit, the temperature regulating water tank, the motor cooling system and the cooling water tank are connected to form a third circulating cooling path; the cold accumulator, the machine room cooling system, the water storage tank, the heater and the motor cooling system are connected to form a fourth circulating cooling path; the cold accumulator, the machine room cooling system and the water storage tank are connected to form a fifth circulating cooling path.
In the technical scheme of the energy-saving system, the water storage tank, the cooling water tank and the temperature regulating water tank are respectively provided with a first temperature monitor, a second temperature monitor and a third temperature monitor.
The water storage tank in the technical scheme of the energy-saving system is connected with a refrigerating unit, a heater and a cold accumulator through a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve after passing through a refrigerating water pump, and the refrigerating unit and the heater are connected with the cold accumulator; the cooling water tank is connected with the motor cooling system, the temperature regulating water tank and the water storage tank through a fifth electromagnetic valve, a sixth electromagnetic valve and a fourth electromagnetic valve respectively after passing through the first cooling water pump, and the temperature regulating water tank is connected with the water storage tank through a seventh electromagnetic valve.
The technical solution of the energy saving system of the present invention further comprises a first controller, a second controller and a third controller; the first controller is connected with the water storage tank, and a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve behind the chilled water pump; the second controller is connected with the cooling water tank, and a fourth electromagnetic valve, a fifth electromagnetic valve and a sixth electromagnetic valve behind the first cooling water pump; and the third controller is electrically connected with the temperature-regulating water tank and a seventh electromagnetic valve connected with the temperature-regulating water tank.
The temperature acquired by the first temperature monitor, the second temperature monitor and the third temperature monitor in the technical scheme of the energy-saving system is respectively transmitted to the first controller, the second controller and the third controller, and then the first controller, the second controller and the third controller regulate and control the switching value of the corresponding electromagnetic valve on each circulating cooling path according to the set temperature range, so that the proper circulating cooling path is selected.
The technical solution of the energy-saving method of the invention is as follows: an energy-saving method of the industrial circulating cooling water energy-saving system based on the central cooling system is characterized by comprising the following steps:
④ when the temperature of the water storage tank (3) is 5-10 deg.C and the outlet temperature of the cooling water tank (18) is less than 30 deg.C, the second and fifth circulating cooling paths are started, the second circulating path is that the cooling water comes out from the cooling water tank, enters the motor cooling system to cool and absorb heat, and finally returns to the cooling water tank, the two paths operate separately to respectively cool the machine room and the motor, the fifth circulating path is that the cooling water comes out from the water storage device, enters the machine room cooling system to cool and absorb heat, then enters the water storage device to exchange heat with the environment, and finally enters the water storage device.
The invention adopts a central cooling mode for the machine room, the distribution room and the like and is coupled and connected with the cooling systems of the equipment such as the motor, the water pump and the like, so that the temperature condition can be matched with the corresponding circulating cooling path through the controller according to the change characteristics of the room temperature in four seasons, the energy conservation is realized, and the cooling effect of the electromechanical equipment is improved. The invention is mainly used for cooling places and equipment such as machine rooms, distribution rooms, motors, water pumps and the like in production enterprises based on a central cooling system. The invention has the advantages of convenient adjustment, stable operation and obvious electricity saving.
Drawings
FIG. 1 is a control structure diagram of an industrial circulating cooling water energy-saving system based on a central cooling system.
FIG. 2 is a process control diagram of an industrial circulating cooling water energy-saving system based on a central cooling system.
Fig. 3 is a cooling water temperature analysis plan diagram of an industrial circulating cooling water energy-saving system based on a central cooling system.
Fig. 4 is a structural block diagram of an industrial circulating cooling water energy-saving system based on a central cooling system.
In the figure: a regenerator; 2. a machine room type cooling system; 3. a water storage tank; 4. a chilled water pump; 5. a refrigerating unit; 6. a heater; 7. a first temperature monitor; a first controller; 9. a signal transmission line; 10. a first electromagnetic valve; 11. a second electromagnetic valve; 12. a third electromagnetic valve; 13. a fourth electromagnetic valve; 14. a fifth electromagnetic valve; 15. a sixth electromagnetic valve; 16. a seventh electromagnetic valve; 17. a second controller; 18. a cooling water tank; 19. a motor cooling system; 20. a temperature-regulating water tank; 21. a third controller; 22. a first cooling water pump; 23. a second cooling water pump; 24. a second temperature monitor; 25. a third temperature monitor.
Detailed Description
The invention is further explained below according to the technical scheme and with the attached drawings.
Referring to fig. 1, the water storage tank 3, the cooling water tank 18 and the temperature-adjusting water tank 20 are respectively provided with a first controller 8, a second controller 17 and a third controller 21, and the first electromagnetic valve 10, the second electromagnetic valve 11, the third electromagnetic valve 12, the fourth electromagnetic valve 13, the fifth electromagnetic valve 14, the sixth electromagnetic valve 15 and the seventh electromagnetic valve 16 are controlled to be switched on and off according to the temperatures obtained by the first temperature monitor 7, the second temperature monitor 24 and the third temperature monitor 25, so as to select different circulating cooling paths.
Referring to fig. 4, the industrial circulating cooling water energy saving system based on the central cooling system of the present invention includes a machine room cooling system 2, a motor cooling system 19, a regenerator 1, a water storage tank 3, a chilled water pump 4, a cooling water tank 18, a chiller unit 5, a temperature regulating water tank 20, a heater 6, a first temperature monitor 7, a first electromagnetic valve 10, a second electromagnetic valve 11, a third electromagnetic valve 12, a fourth electromagnetic valve 13, a fifth electromagnetic valve 14, a sixth electromagnetic valve 15, a seventh electromagnetic valve 16, a first controller 8, a second controller 17, and a third controller 21. The water storage tank 3 is connected with the refrigerating unit 5, the heater 6 and the cold accumulator 1 through a first electromagnetic valve 10, a second electromagnetic valve 11 and a third electromagnetic valve 12 respectively after passing through the refrigerating water pump 4, and the refrigerating unit 5 and the heater 6 are connected with the cold accumulator 1. The cooling water tank 18 is connected with the motor cooling system 19, the temperature-regulating water tank 20 and the water storage tank 3 through a fifth electromagnetic valve 14, a sixth electromagnetic valve 15 and a fourth electromagnetic valve 13 respectively after passing through a first cooling water pump 22, and the temperature-regulating water tank 20 is connected with the water storage tank 3 through a seventh electromagnetic valve 16. The cold accumulator 1, the machine room cooling system 2, the water storage tank 3 and the refrigerating unit 5 are connected to form a first circulating cooling path, the first temperature monitor 7 is arranged on the water storage tank 3, the water storage tank 3 and the refrigerating unit 5 are connected through the refrigerating water pump 4 and the first electromagnetic valve 10, and the first controller 8 is connected with the first electromagnetic valve 10, the second electromagnetic valve 11, the third electromagnetic valve 12 and the first temperature monitor 7. The cooling water tank 18 and the motor cooling system 19 are connected to form a second circulating cooling path. The cold accumulator 1, the machine room cooling system 2, the water storage tank 3, the refrigerating unit 5, the temperature regulating water tank 20, the motor cooling system 19 and the cooling water tank 18 are connected to form a third circulating cooling path, the water inlet end of the cooling water tank 18 is connected with the water outlet end of the motor cooling system 19, the water outlet end of the cooling water tank 18 is connected with the water inlet end of the temperature regulating water tank 20 through the refrigerating water pump 4 and the sixth electromagnetic valve 15, the cooling water tank 18 is provided with a second temperature monitor 24, and the second controller 17 is connected with the sixth electromagnetic valve 15 and the second temperature monitor 24. The cold accumulator 1, the machine room cooling system 2, the water storage tank 3, the heater 6 and the motor cooling system 19 are connected to form a fourth circulating cooling path, the water outlet end of the motor cooling system 19 is connected with the water inlet end of the water storage tank 3 through a fourth electromagnetic valve 13 and a fifth electromagnetic valve 14, the second controller 17 is connected with the fourth electromagnetic valve 13 and the fifth electromagnetic valve 14, the water inlet end of the motor cooling system 19 is connected with the water outlet end of the machine room cooling system 2 through a second cooling water pump 23, a temperature regulating water tank 20 and a seventh electromagnetic valve 16, the temperature regulating water tank 20 is provided with a third temperature monitor 25, and the third controller 21 is connected with the temperature monitor and the seventh electromagnetic valve 16.
The cold accumulator 1, the machine room type cooling system 2 and the water storage tank 3 are connected to form a fifth circulating cooling path, the two ends of the machine room type cooling system 2 are respectively connected with the cold accumulator 1 and the water storage tank 3, and the water storage tank and the cold accumulator are controlled by a second electromagnetic valve 11.
The temperatures acquired by the first temperature monitor 7, the second temperature monitor 24 and the third temperature monitor 25 are respectively transmitted to the first controller 8, the second controller 17 and the third controller 21, and then the first controller 8, the second controller 17 and the third controller 21 regulate and control the switching value of the corresponding electromagnetic valve on each circulating cooling path according to the set temperature range, so that the proper circulating cooling path is selected. The water temperatures in the water tank 3 and at the outlet of the cooling water tank 18 are used as variables, and the corresponding circulating cooling paths are started according to different temperature ranges.
Referring to fig. 1, 2 and 3, when the temperature of water obtained by the first temperature monitor 7 on the water storage tank 3 is higher than 10 ℃, the first circulation cooling path is started to work to form a loop, the first electromagnetic valve 10 between the water storage tank 3 and the refrigerating unit 5 is opened, other valves are closed, the circulation process is that the refrigerating unit 5 reduces the temperature of the refrigerating water to 5-10 ℃, the refrigerating water is sent to the cold accumulator 1 for storage, then the refrigerating water is distributed by the cold accumulator 1 to enter the machine room type cooling system 2 for cooling and heat absorption, the refrigerating water with the increased temperature enters the water storage tank 3, and finally the refrigerating water is sent to the refrigerating unit 5 for cooling, so that a cooling cycle is completed.
When the first temperature monitor 7 on the water storage tank 3 detects that the water temperature of the water storage tank 3 is between 5 ℃ and 10 ℃, the fifth circulating cooling path is started to work to form a loop, the chilled water directly enters the cold accumulator 1 from the water storage tank 3, and then the machine room type cooling system 2 is cooled, the circulating process is that the water storage tank 3 naturally absorbs the cold energy to enter the cold accumulator 1, the chilled water is sent to the machine room type cooling system 2 from the cold accumulator 1, and the chilled water returns to the water storage tank 3 after cooling and heat absorption. When the water storage tank temperature monitor monitors that the water temperature of the water storage tank 3 is less than 5 ℃, the fourth circulating cooling path is started to work to form a loop, at the moment, a fourth electromagnetic valve 13 and a fifth electromagnetic valve 14 between the motor cooling system 19 and the water storage tank 3 are opened, so that cooling water of the motor cooling system 19 enters the water storage tank 3, is subjected to mixed heating and is sent to the heater 6, and when the temperature is 5-10 ℃, the cooling water directly enters the cold accumulator 1, so that the machine room cooling system 2 is cooled, and then part of the cooling water coming out of the machine room cooling system 2 enters the motor cooling system 19 to be cooled. When the heater monitors that the water temperature of the mixed water storage tank 3 is still less than 5 ℃, the heater 6 is required to start heating at the moment, so that the temperature of the mixed water is 5-10 ℃, and then the mixed water is sent to the cold accumulator 1, and then the machine room type cooling system 2 is cooled.
Referring to fig. 1, 2 and 3, when the second temperature monitor 24 on the cooling water tank 18 detects that the temperature of the cooling water at the cooling water outlet is greater than 30 ℃, the third circulating cooling path is started to form a loop, the cooling water enters the temperature-adjusting water tank 20 from the cooling water tank 18 and is mixed with the cold water from the water storage tank 3 to reduce the temperature, if the temperature of the temperature-adjusting water tank is greater than 30 ℃, the third controller 21 adjusts the opening of the seventh electromagnetic valve 16 to increase the cooling water from the water storage tank 3, and when the temperature of the temperature-adjusting water tank 20 is reduced to 28 ℃, the opening of the seventh electromagnetic valve 16 is maintained. The cooling water enters a motor cooling system 19 for absorbing heat and cooling, then enters a cooling water tank 18, the cooling water from the cooling water tank 18 is divided into two parts, one part enters a water storage tank 3, and the other part enters a temperature regulating water tank 20. When the temperature of the cooling water at the cooling water outlet of the cooling water tank 18 is monitored to be less than 30 ℃, a second circulating cooling path is started to work to form a loop, the circulating process is that the cooling water is sent to each motor cooling system 19 needing cooling from the cooling water tank 18, and after the cooling water is cooled and absorbs heat in the motor cooling system 19, the cooling water returns to the cooling water tank 18 for cooling.
In summer, the cold accumulator 1 is matched with the refrigerating unit 5, so that peak clipping and valley filling can be realized; in the transition season, the machine room cooling system 2 can be cooled by the aid of the cold energy of the environment; in winter, the cooling water of the motor cooling system 12 is used for heating the water in the water storage tank, so that waste heat utilization is realized. The system has the advantages of convenient adjustment, stable operation and capability of saving electricity by 10-20% all the year round.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides an industry recirculated cooling water economizer system based on central cooling system, includes computer lab class cooling system (2), motor class cooling system (19), regenerator (1), storage water tank (3), coolant tank (18) and refrigerating unit (5), and regenerator (1), computer lab class cooling system (2), storage water tank (3) and refrigerating unit (5) are connected and are constituted first circulative cooling route, its characterized in that: the device also comprises a temperature regulating water tank (20) and a heater (6); the cooling water tank (18) is connected with the motor cooling system (19) to form a second circulating cooling path; the cold accumulator (1), the machine room cooling system (2), the water storage tank (3), the refrigerating unit (5), the temperature regulating water tank (20), the motor cooling system (19) and the cooling water tank (18) are connected to form a third circulating cooling path; the cold accumulator (1), the machine room cooling system (2), the water storage tank (3), the heater (6) and the motor cooling system (19) are connected to form a fourth circulating cooling path; the cold accumulator (1), the machine room cooling system (2) and the water storage tank (3) are connected to form a fifth circulating cooling path.
2. The industrial circulating cooling water energy-saving system based on the central cooling system is characterized in that: the water storage tank (3), the cooling water tank (18) and the temperature regulating water tank (20) are respectively provided with a first temperature monitor (7), a second temperature monitor (24) and a third temperature monitor (25).
3. The industrial circulating cooling water energy-saving system based on the central cooling system as claimed in claim 1 or 2, wherein: the water storage tank (3) is connected with the refrigerating unit (5), the heater (6) and the cold accumulator (1) through a first electromagnetic valve (10), a second electromagnetic valve (11) and a third electromagnetic valve (12) after passing through the refrigerating water pump (4), and the refrigerating unit (5) and the heater (6) are connected with the cold accumulator (1); the cooling water tank (18) is connected with the motor cooling system (19), the temperature-regulating water tank (20) and the water storage tank (3) through a fifth electromagnetic valve (14), a sixth electromagnetic valve (15) and a fourth electromagnetic valve (13) after passing through a first cooling water pump (22), and the temperature-regulating water tank (20) is connected with the water storage tank (3) through a seventh electromagnetic valve (16).
4. The industrial circulating cooling water energy-saving system based on the central cooling system is characterized in that: the system also comprises a first controller (8), a second controller (17) and a third controller (21); the first controller (8) is connected with the water storage tank (3) and a first electromagnetic valve (10), a second electromagnetic valve (11) and a third electromagnetic valve (12) behind the chilled water pump (4); the second controller (17) is connected with the cooling water tank (18) and a fourth electromagnetic valve (13), a fifth electromagnetic valve (14) and a sixth electromagnetic valve (15) behind the first cooling water pump (22); the third controller (21) is electrically connected with the temperature-regulating water tank (20) and a seventh electromagnetic valve (16) connected with the temperature-regulating water tank (20).
5. The industrial circulating cooling water energy-saving system based on the central cooling system is characterized in that: the temperatures acquired by the first temperature monitor (7), the second temperature monitor (24) and the third temperature monitor (25) are respectively transmitted to the first controller (8), the second controller (17) and the third controller (21), and then the first controller (8), the second controller (17) and the third controller (21) regulate and control the switching value of the corresponding electromagnetic valve on each circulating cooling path according to the set temperature range, so that the proper circulating cooling path is selected.
6. The industrial circulating cooling water energy-saving system based on the central cooling system is characterized in that: the water temperatures in the water storage tank (3) and at the outlet of the cooling water tank (18) are taken as variables, and the corresponding circulating cooling paths are started according to different temperature ranges.
7. An energy-saving method for the industrial circulating cooling water energy-saving system based on the central cooling system, which is characterized by comprising the following steps:
④ when the temperature of the water storage tank (3) is 5-10 ℃, the outlet temperature of the cooling water tank (18) is less than 30 ℃, a second circulation cooling path and a fifth circulation cooling path are started, the second circulation path is that the cooling water flows out from the cooling water tank (18), enters the cooling system (19) of the electric machine to cool and absorb heat, and finally returns to the cooling water tank, the two paths independently operate to respectively cool the machine room and the electric machine, and the fifth circulation path is that the cooling water flows out from the water accumulator (1), enters the cooling system (2) of the machine room to cool, then enters the water accumulator (3) to exchange heat with the environment, and finally enters the water accumulator (4).
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