CN106369772A - Safety protection method for variable-flow operation of central air conditioner cooling water system - Google Patents
Safety protection method for variable-flow operation of central air conditioner cooling water system Download PDFInfo
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- CN106369772A CN106369772A CN201610987320.XA CN201610987320A CN106369772A CN 106369772 A CN106369772 A CN 106369772A CN 201610987320 A CN201610987320 A CN 201610987320A CN 106369772 A CN106369772 A CN 106369772A
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- cooling water
- water
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- temperature
- protection
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Classifications
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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
- F24F2110/00—Control inputs relating to air properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
- F24F11/58—Remote control using Internet communication
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/40—Pressure, e.g. wind pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention discloses a safety protection method for variable-flow operation of a central air conditioner cooling water system. A central processing unit, a communication module and a cooling module are included. Through the adoption of four protection methods of heat exchange amount balance protection, cooling water low-flow protection, cooling water output temperature high-temperature protection and centrifugal machine surge protection, the central processing unit is used for carrying out collection and operation on data, and the communication module is used for controlling and detecting a freezing water pump and a cooling water pump; and when the cooling capacity of cooling water is smaller than the cooling capacity of freezing water and operation energy consumption of a water chilling unit, the water flow of the cooling water pump is lower than the lowest flow, the cooling water output temperature is higher than the limiting value, or the pressure difference between condenser pressure and evaporator pressure exceeds the set limiting value, the flow of the cooling water is increased in time, and therefore operation of the water chilling unit is prevented from being influenced, the function of safety protection on variable-flow operation of the central air conditioner cooling water system is achieved, and the aim of effectively saving energy is achieved.
Description
Technical field
The present invention relates to central air-conditioning energy technical field, especially a kind of central air conditioning cooling water system variable-flow operation
Method for security protection.
Background technology
With expanding economy, the use occasion of central air-conditioning gets more and more, and energy consumption constantly rises, to the electric power of each place
Supply brings very big pressure.So, the energy-conservation of central air conditioner system becomes more and more important.
Vari- able flow control for central air conditioner system also arises at the historic moment, by tail end air conditioner unit and chilled water pump,
Reach good effect, be in recent years gradually also applied on cooling water system, but there is some problems and dispute, particularly
Variable Cooling Water Flow amount affects the emphasis of always arguement for handpiece Water Chilling Units performance and safety.
Content of the invention
It is an object of the invention to provide a kind of method for security protection of central air conditioning cooling water system variable-flow operation, tool
There is good Energy Saving Control effect, to solve the problems, such as to propose in above-mentioned background technology.
For achieving the above object, the present invention provides a kind of following technical scheme: central air conditioning cooling water system, including central authorities
Processor, communication module and refrigerating module, described central processing unit is arranged in tail end air conditioner unit, central processing unit and communication
Module carries out signal connection；Described communication module includes profibus network, communication gate and modbus network, central processing unit
Connected by profibus Networks and Communications gateway, communication gate carries out signal by modbus network and refrigerating module and is connected；
Described refrigerating module is arranged in refrigeration machine and blower fan of cooling tower, and one end of refrigeration machine is circumscribed with chilled water pump by pipeline, cold
The other end freezing water pump is plugged on tail end air conditioner unit by pipeline；The other end of described refrigeration machine is also communicated with cooling water
Pump, the other end of cooling water pump is plugged in blower fan of cooling tower by pipeline, is provided with fan frequency converter in blower fan of cooling tower；Institute
State and in cooling water pump and chilled water pump, be additionally provided with water supply pump converter, water supply pump converter and fan frequency converter pass through modbus
Communication gate in Networks and Communications module is electrically connected with；The Inlet and outlet water port of described cooling water pump and chilled water pump also sets up
There is sensor, sensor is electrically connected with the central processing unit in tail end air conditioner unit.
A kind of method for security protection of central air conditioning cooling water system variable-flow operation, including heat exchange amount balanced protection, cold
But the protection of water low discharge, cooling water leaving water temperature high temperature protection and centrifuge surge protection, its principle is as follows:
Heat exchange amount balanced protection: can be obtained by central air conditioning cooling water system, cool down Water transport heat=tail end air conditioner unit
(4) heat exchange amount+handpiece Water Chilling Units operation energy consumption, detects chilled-water flow, chilled water supply and return water temperature, cooling by sensor (11)
Water-cooled amount and cooling water turnover coolant-temperature gage, and chilled water cold amount and cooling water cold are calculated by central processing unit (1), if cooling
< chilled water cold amount+handpiece Water Chilling Units operation energy consumption, should increase cooling water flow to water-cooled amount；
Cooling water low discharge is protected: can be obtained by central air conditioning cooling water system, for ensureing the condensation utensil in refrigeration machine (5)
There is preferable heat transfer effect, by setting different handpiece Water Chilling Units cooling water minimum flows, less than minimum flow, cooling should be increased
Discharge；
Cooling water leaving water temperature high temperature protection: can be obtained by central air conditioning cooling water system, cold in-water temperature was by that time
Outdoor wet bulb temperature and cooling tower heat exchange property determine, by set cooling water water outlet high temperature limit value, higher than limit value, should increase
Cooling water flow；
Centrifuge surge protection: can be obtained by central air conditioning cooling water system, cold by condensing pressure sensor real-time detection
Condenser pressure and evaporator pressure, when both pressure reduction exceed setting limit value, the water supply pump converter (9) in cooling water pump (8)
Not frequency reducing or raising frequency, to ensure that handpiece Water Chilling Units do not enter surge area.
As the further scheme of the present invention: described sensor includes flow transducer, temperature sensor, cold sensor
With condensing pressure sensor, and condensing pressure sensor is arranged in the condenser of refrigeration machine.
As the further scheme of the present invention: the profibus network in described communication module and modbus network are existing
Communications protocol mode, can be replaced by other standards network communication protocol.
As the further scheme of the present invention: cooling tower heat transfer temperature difference=cold in-water temperature-outdoor wet bulb temperature；Cold
But water turnover water temperature difference=cooling water leaving water temperature-cold in-water temperature；Condenser heat transfer temperature difference=condensation temperature-cooling water
Leaving water temperature.
Compared with prior art, the invention has the advantages that:
The method for security protection of this central air conditioning cooling water system variable-flow operation, by using heat exchange amount balanced protection,
Four kinds of guard methods such as the protection of cooling water low discharge, cooling water leaving water temperature high temperature protection and centrifuge surge protection, by central authorities
Processor is acquired computing and by communication module, chilled water pump and cooling water pump is controlled and detects, cold to data
But water-cooled amount < during chilled water cold amount+handpiece Water Chilling Units operation energy consumption, the discharge of cooling water pump when being less than minimum flow, cooling water
When water outlet high temperature is higher than during limit value or condenser pressure and evaporator pressure pressure reduction exceed setting limit value, increase cooling current in time
Amount, thus avoiding affecting handpiece Water Chilling Units operation, reaches the effect of the safeguard protection of central air conditioning cooling water system variable-flow operation,
Play the purpose of effective energy-conservation.
Brief description
Fig. 1 is the system block diagram of the present invention；
Fig. 2 is the fundamental diagram of the present invention；
Fig. 3 is the handpiece Water Chilling Units cold side heat transfer temperature difference schematic diagram of the present invention.
In figure: 1- central processing unit；2- communication module；21-profibus network；22- communication gate；23-modbus net
Network；3- refrigerating module；4- tail end air conditioner unit；5- refrigeration machine；6- blower fan of cooling tower；7- chilled water pump；8- cooling water pump；9- is cold
Pump variable frequency device；10- fan frequency converter；11- sensor.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
Refer to Fig. 1-3, in the embodiment of the present invention, a kind of central air conditioning cooling water system, including central processing unit 1, leads to
Letter module 2 and refrigerating module 3, central processing unit 1 is arranged in tail end air conditioner unit 4, and central processing unit 1 is used for external load
And data carries out signal processing, to facilitate the carrying out of follow-up work；Central processing unit 1 carries out signal with communication module 2 and is connected, and leads to
Letter module 2 includes profibus network 21, communication gate 22 and modbus network 23, the profibus network in communication module 2
21 and modbus networks 23 are existing communication agreement mode, also can be replaced by other standards network communication protocol, central authorities are processed
Device 1 is connected with communication gate 22 by profibus network 21, communication gate 22 in communication module 2 at least provided with one,
Communication gate 22 carries out signal by modbus network 23 with refrigerating module 3 and is connected；Refrigerating module 3 is arranged on refrigeration machine 5 and cold
But, in tower blower fan 6, one end of refrigeration machine 5 is circumscribed with chilled water pump 7 by pipeline, and the other end of chilled water pump 7 passes through pipeline and inserts
It is connected on tail end air conditioner unit 4；The other end of refrigeration machine 5 is also communicated with cooling water pump 8, and the other end of cooling water pump 8 passes through pipe
Road is plugged in blower fan of cooling tower 6, is provided with fan frequency converter 10 in blower fan of cooling tower 6, and fan frequency converter 10 is used for controlling cold
But in tower blower fan 6 motor operation；It is additionally provided with water supply pump converter 9, cold water pump frequency conversion in cooling water pump 8 and chilled water pump 7
Device 9 is used for adjusting chilled water pump 7 and the working condition of cooling water pump 8, and water supply pump converter 9 and fan frequency converter 10 pass through
Modbus network 23 is electrically connected with the communication gate 22 in communication module 2；Inlet and outlet water in cooling water pump 8 and chilled water pump 7
Port is additionally provided with sensor 11, and sensor 11 includes flow transducer, temperature sensor, cold sensor and condensing pressure
Sensor, and condensing pressure sensor is arranged in the condenser of refrigeration machine 5, the outfan of sensor 11 and tail end air conditioner unit
Central processing unit 1 in 4 is electrically connected with, and receives each cooling module data information by central processing unit 1, and carries out signal to it
Process, rationally control communication module 2, communication module 2 controls cooling water pump 8 and chilled water pump 7 to work, and plays to central air-conditioning cold
But water system rationally controls the purpose of energy-conservation.
A kind of method for security protection of central air conditioning cooling water system variable-flow operation, including heat exchange amount balanced protection, cold
But the protection of water low discharge, cooling water leaving water temperature high temperature protection and centrifuge surge protection, its principle is as follows:
Heat exchange amount balanced protection: can be obtained by central air conditioning cooling water system, cool down Water transport heat=tail end air conditioner unit 4
Heat exchange amount+handpiece Water Chilling Units operation energy consumption, detects chilled-water flow, chilled water supply and return water temperature, cooling water-cooled by sensor 11
Amount and cooling water pass in and out coolant-temperature gage, and calculate chilled water cold amount and cooling water cold by central processing unit 1, if cooling water cold
< chilled water cold amount+handpiece Water Chilling Units operation energy consumption, by adjusting cooling water pump 8, increases cooling water flow, reaches heat exchange amount balance
The purpose of protection.
Cooling water low discharge is protected: can be obtained by central air conditioning cooling water system, have for the condenser in guarantee refrigeration machine 5
Preferably heat transfer effect, in condenser, cooling water should keep turbulent condition, and many brand handpiece Water Chilling Units all enable cold at present
Automatically adjust, condenser can change between the 50%～100% of metered flow, by setting different handpiece Water Chilling Units cooling waters
Minimum flow, when the discharge of cooling water pump 8 is less than minimum flow, increases cooling water flow by the control of central processing unit 1,
Thus reaching the purpose of cooling water low discharge protection.
Cooling water leaving water temperature high temperature protection: can be obtained by central air conditioning cooling water system, in certain period of time, cooling water
Inflow temperature determines, condenser cannot be controlled, cooling tower heat exchange temperature by outdoor wet bulb temperature at that time and cooling tower heat exchange property
Difference=cold in-water temperature-outdoor wet bulb temperature；Cooling water turnover water temperature difference=cooling water leaving water temperature-cooling water enters water temperature
Degree；Condenser heat transfer temperature difference=condensation temperature-cooling water leaving water temperature；So condensation temperature is determined by cooling water leaving water temperature,
Cooling water leaving water temperature is higher, and condensation temperature is higher, and condensation temperature is too high to be led to handpiece Water Chilling Units energy consumption to increase, affect to run the longevity
Life, seriously will lead to compressor exhaust temperature too high, impact oil, set cooling water water outlet high temperature limit value, higher than limit value, Ying Jia
Big cooling water flow, it is to avoid impact handpiece Water Chilling Units are run.
Centrifuge surge protection: can be obtained by central air conditioning cooling water system, cold by condensing pressure sensor real-time detection
Condenser pressure and evaporator pressure, and transfer data to central processing unit 1, data processing is carried out by central processing unit 1, when two
When person's pressure reduction exceedes setting limit value, the water supply pump converter 9 not frequency reducing in cooling water pump 8 or raising frequency, thus ensure handpiece Water Chilling Units
Do not enter surge area, reach the effect of centrifuge surge protection.
In sum: the method for security protection of this central air conditioning cooling water system variable-flow operation, by adopting heat exchange amount
Four kinds of protection sides such as balanced protection, the protection of cooling water low discharge, cooling water leaving water temperature high temperature protection and centrifuge surge protection
Method, is acquired computing and by communication module 2, chilled water pump 7 and cooling water pump 8 is controlled by central processing unit 1 to data
System and detecting, cooling water cold < during chilled water cold amount+handpiece Water Chilling Units operation energy consumption, the discharge of cooling water pump 8 be less than minimum
During flow, cooling water water outlet high temperature be higher than during limit value or when condenser pressure and evaporator pressure pressure reduction exceed setting limit value, and
Shi Jia great cooling water flow, thus avoiding affecting handpiece Water Chilling Units operation, reaches central air conditioning cooling water system variable-flow operation
The effect of safeguard protection, plays the purpose of effective energy-conservation.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of the spirit or essential attributes of the present invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as limiting involved claim.
Moreover, it will be appreciated that although this specification is been described by according to embodiment, not each embodiment only wraps
Containing an independent technical scheme, only for clarity, those skilled in the art should for this narrating mode of description
Using description as an entirety, the technical scheme in each embodiment can also form those skilled in the art through appropriately combined
Understandable other embodiment.
Claims (5)
1. a kind of central air conditioning cooling water system, including central processing unit (1), communication module (2) and refrigerating module (3), it is special
Levy and be: described central processing unit (1) is arranged in tail end air conditioner unit (4), and central processing unit (1) is entered with communication module (2)
Row signal connects；Described communication module (2) includes profibus network (21), communication gate (22) and modbus network (23),
Central processing unit (1) is connected with communication gate (22) by profibus network (21), and communication gate (22) passes through modbus net
Network (23) carries out signal with refrigerating module (3) and is connected；Described refrigerating module (3) is arranged on refrigeration machine (5) and blower fan of cooling tower (6)
Interior, one end of refrigeration machine (5) is circumscribed with chilled water pump (7) by pipeline, and the other end of chilled water pump (7) is plugged on by pipeline
On tail end air conditioner unit (4)；The other end of described refrigeration machine (5) is also communicated with cooling water pump (8), cooling water pump (8) another
End is plugged in blower fan of cooling tower (6) by pipeline, is provided with fan frequency converter (10) in blower fan of cooling tower (6)；Described cooling
It is additionally provided with water supply pump converter (9), water supply pump converter (9) and fan frequency converter (10) in water pump (8) and chilled water pump (7)
It is electrically connected with the communication gate (22) in communication module (2) by modbus network (23)；Described cooling water pump (8) and freezing
The Inlet and outlet water port of water pump (7) is additionally provided with sensor (11), the centre in sensor (11) and tail end air conditioner unit (4)
Reason device (1) is electrically connected with.
2. a kind of method for security protection of central air conditioning cooling water system variable-flow operation, including heat exchange amount balanced protection, cooling
The protection of water low discharge, cooling water leaving water temperature high temperature protection and centrifuge surge protection, its principle is as follows:
Heat exchange amount balanced protection: can be obtained by central air conditioning cooling water system, cooling Water transport heat=tail end air conditioner unit (4) changes
Heat+handpiece Water Chilling Units operation energy consumption, detects chilled-water flow, chilled water supply and return water temperature, cooling water-cooled by sensor (11)
Amount and cooling water pass in and out coolant-temperature gage, and calculate chilled water cold amount and cooling water cold by central processing unit (1), if cooling water-cooled
< chilled water cold amount+handpiece Water Chilling Units operation energy consumption, should increase cooling water flow to amount；
Cooling water low discharge is protected: can be obtained by central air conditioning cooling water system, have relatively for the condenser in guarantee refrigeration machine (5)
Good heat transfer effect, by setting different handpiece Water Chilling Units cooling water minimum flows, less than minimum flow, should increase cooling current
Amount；
Cooling water leaving water temperature high temperature protection: can be obtained by central air conditioning cooling water system, cold in-water temperature is by room at that time
Outer wet bulb temperature and cooling tower heat exchange property determine, by setting cooling water water outlet high temperature limit value, higher than limit value, should increase cooling
Discharge；
Centrifuge surge protection: can be obtained by central air conditioning cooling water system, by condensing pressure sensor real-time detection condenser
Pressure and evaporator pressure, when both pressure reduction exceed setting limit value, the water supply pump converter (9) in cooling water pump (8) does not drop
Frequency or raising frequency, to ensure that handpiece Water Chilling Units do not enter surge area.
3. a kind of central air conditioning cooling water system according to claim 1 it is characterised in that: described sensor (11) includes
Flow transducer, temperature sensor, cold sensor and condensing pressure sensor, and condensing pressure sensor is arranged on refrigeration machine
(5) in condenser.
4. a kind of central air conditioning cooling water system according to claim 1 it is characterised in that: in described communication module (2)
Profibus network (21) and modbus network (23) be existing communication agreement mode, can be assisted by other standards network communication
View replaces.
5. the method for security protection of a kind of central air conditioning cooling water system variable-flow operation according to claim 2, it is special
Levy and be: cooling tower heat transfer temperature difference=cold in-water temperature-outdoor wet bulb temperature；Cooling water turnover water temperature difference=cooling water goes out
Coolant-temperature gage-cold in-water temperature；Condenser heat transfer temperature difference=condensation temperature-cooling water leaving water temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610987320.XA CN106369772B (en) | 2016-11-07 | 2016-11-07 | A kind of method for security protection of central air conditioning cooling water system variable-flow operation |
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| CN201610987320.XA CN106369772B (en) | 2016-11-07 | 2016-11-07 | A kind of method for security protection of central air conditioning cooling water system variable-flow operation |
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| CN106369772A true CN106369772A (en) | 2017-02-01 |
| CN106369772B CN106369772B (en) | 2019-06-18 |
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Cited By (7)
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| CN106989478A (en) * | 2017-02-24 | 2017-07-28 | 深圳达实智能股份有限公司 | Applied to the isobaric method for controlling frequency conversion of hospital's size chilled water pump in parallel and device |
| CN108332371A (en) * | 2018-01-12 | 2018-07-27 | 深圳市奥宇节能技术股份有限公司 | A kind of control method and device of air-conditioning high temperature and pressure |
| CN109213229A (en) * | 2017-07-07 | 2019-01-15 | 深圳市辉宏技术有限公司 | A kind of HTM control method for improving efficiency, apparatus and system |
| CN109269037A (en) * | 2018-10-09 | 2019-01-25 | 珠海格力电器股份有限公司 | The control method and device of air-conditioning system |
| CN110207317A (en) * | 2019-05-13 | 2019-09-06 | 天津市始祖鸟网络科技有限公司 | A kind of energy-saving control method for central air conditioner, device |
| CN112833611A (en) * | 2021-01-22 | 2021-05-25 | 深圳市奥宇节能技术股份有限公司 | Cooling circulating water system and control method thereof |
| CN114440410A (en) * | 2022-02-14 | 2022-05-06 | 深圳嘉力达节能科技有限公司 | Method for carrying out variable flow control on freezing and cooling water pumps based on heat exchange efficiency |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106989478A (en) * | 2017-02-24 | 2017-07-28 | 深圳达实智能股份有限公司 | Applied to the isobaric method for controlling frequency conversion of hospital's size chilled water pump in parallel and device |
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| CN108332371A (en) * | 2018-01-12 | 2018-07-27 | 深圳市奥宇节能技术股份有限公司 | A kind of control method and device of air-conditioning high temperature and pressure |
| CN109269037A (en) * | 2018-10-09 | 2019-01-25 | 珠海格力电器股份有限公司 | The control method and device of air-conditioning system |
| CN110207317A (en) * | 2019-05-13 | 2019-09-06 | 天津市始祖鸟网络科技有限公司 | A kind of energy-saving control method for central air conditioner, device |
| CN112833611A (en) * | 2021-01-22 | 2021-05-25 | 深圳市奥宇节能技术股份有限公司 | Cooling circulating water system and control method thereof |
| CN114440410A (en) * | 2022-02-14 | 2022-05-06 | 深圳嘉力达节能科技有限公司 | Method for carrying out variable flow control on freezing and cooling water pumps based on heat exchange efficiency |
| CN114440410B (en) * | 2022-02-14 | 2023-09-08 | 深圳嘉力达节能科技有限公司 | Variable flow control method for freezing and cooling water pump based on heat exchange efficiency |
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