CN106524410A - Diagnosis method for actual efficiency of central air conditioner cooling water unit - Google Patents
Diagnosis method for actual efficiency of central air conditioner cooling water unit Download PDFInfo
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- CN106524410A CN106524410A CN201610983486.4A CN201610983486A CN106524410A CN 106524410 A CN106524410 A CN 106524410A CN 201610983486 A CN201610983486 A CN 201610983486A CN 106524410 A CN106524410 A CN 106524410A
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- temperature
- water
- chilling units
- cooling water
- efficiency
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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
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a diagnosis method for the actual efficiency of a central air conditioner cooling water unit. The central air conditioner cooling water unit comprises a cooling water unit body; the cooling water unit body consists of a compressor, a condenser, a throttle valve and an evaporator; a port of the cooling water unit body is also connected with a chilled water pump and a cooling water pump; a port of the cooling water pump is plugged in a cooling tower through a pipeline; the diagnosis method comprises the following steps: determining factors which influence the efficiency of the cooling water unit and establishing an actual efficiency database of the cooling water unit, and diagnosing the actual efficiency of the cooling water unit to establish a cooling water unit actual efficiency database which serves as a control basis of group control of cooling water units. The comprehensive efficiency of a central air conditioning system is improved; meanwhile, the diagnosis method can also be used for evaluating the health state of the cooling water machine set, and guiding equipment management personnel to perform prediction type maintenance; and the work efficiency is improved, and the maintenance cost is reduced.
Description
Technical field
The present invention relates to central air-conditioning energy technical field, especially a kind of central air-conditioning handpiece Water Chilling Units actual efficiency are examined
Disconnected method.
Background technology
The efficiency of central air-conditioning handpiece Water Chilling Units is typically using COP as performance indications.COP refers to the ratio of cold and power consumption
Value, is worth higher explanation chiller efficiency better.But this evaluation method only only accounts for rate of load condensate for handpiece Water Chilling Units
Affect, do not consider other factorses, it is impossible to operational efficiency of the thoroughly evaluating handpiece Water Chilling Units in actual motion.
For example：Two handpiece Water Chilling Units are located at Shenzhen and Shanghai respectively, and rate of load condensate is essentially identical, and Jing determines the cooling-water machine in Shanghai
Group COP values apparently higher than be located at Shenzhen handpiece Water Chilling Units, now judge the chiller efficiency in Shanghai it is higher be not to because
When may measure, the weather conditions in Shanghai are better than Shenzhen, and cause the COP of handpiece Water Chilling Units to be higher than Shenzhen, so for cooling-water machine
The evaluation of the actual efficiency of group is in addition to rate of load condensate, it is also contemplated that more other factorses.
The content of the invention
It is an object of the invention to provide a kind of diagnostic method of central air-conditioning handpiece Water Chilling Units actual efficiency, by cold water
Handpiece Water Chilling Units actual efficiency database is set up in the diagnosis of unit actual efficiency, as the control foundation of handpiece Water Chilling Units team control, in raising
Centre air-conditioning system overall efficiency；Can be additionally used in simultaneously evaluating handpiece Water Chilling Units health status, instruct equipment management personnel to be predicted
Formula is safeguarded, improves operating efficiency, reduces maintenance cost, to solve the problems, such as to propose in above-mentioned background technology.
For achieving the above object, the present invention provides following technical scheme：
A kind of central air-conditioning handpiece Water Chilling Units, including handpiece Water Chilling Units, the handpiece Water Chilling Units are by compressor, condenser, choke valve
Constitute with evaporimeter, the high temperature and high pressure gas exhaust outlet of compressor is connected by the high temperature and high pressure gas air inlet of pipeline and condenser
Connect, the low-voltage high-temperature refrigerant vapor air entry of compressor is connected by the low-voltage high-temperature refrigerant vapor exhaust outlet of pipeline and evaporimeter
Connect；The low-temperature low-pressure refrigerant liquid inlet of the evaporimeter is connected with choke valve by pipeline, the high pressure low temperature system of choke valve
Cryogen liquid inlet is connected with the outlet of the cryogenic high pressure refrigerant liquid of condenser by pipeline；The handpiece Water Chilling Units
Chilled water pump and cooling water pump are circumscribed with port also, chilled water pump is connected with the evaporimeter in handpiece Water Chilling Units by pipeline；Institute
The Single port for stating cooling water pump is connected with the condenser in handpiece Water Chilling Units by pipeline, and the another port of cooling water pump passes through pipeline
It is plugged on cooling tower.
A kind of diagnostic method of central air-conditioning handpiece Water Chilling Units actual efficiency, including affect the efficiency factor of handpiece Water Chilling Units and build
The actual efficiency database of vertical handpiece Water Chilling Units, affects the efficiency factor of handpiece Water Chilling Units to be divided into internal factor and external factor, internal
Factor is rate of load condensate, is determined by the species of the operative configuration of handpiece Water Chilling Units, manufacture level, the performance of compressor and required cold-producing medium
It is fixed；External factor depends on evaporating temperature and condensation temperature, and evaporating temperature includes chilled water supply water temperature, chilled water return water temperature
With the heat exchange efficiency of evaporimeter；Condensation temperature include outdoor wet-bulb temperature, the heat exchange efficiency of cooling tower, cold in-water temperature,
The heat exchange efficiency of cooling water leaving water temperature and condenser；
The actual efficiency database for setting up handpiece Water Chilling Units is divided into direct factor and indirect factor, and direct factor includes that load is needed
Ask, load factor, evaporating temperature and condensation temperature, which is recorded in the COP of handpiece Water Chilling Units as variable；Indirect factor includes evaporation
Device heat exchange efficiency, condenser heat exchange efficiency, cooling water pump conveying capacity and cooling tower heat exchange property, which is introduced as external data
And individually set up database or Mathematical Modeling.
As further scheme of the invention：The efficiency of the handpiece Water Chilling Units is proportional with the temperature of evaporimeter.
As further scheme of the invention：The efficiency of the handpiece Water Chilling Units is with the temperature of condenser inversely.
As further scheme of the invention：Heat transfer temperature difference of the heat exchange efficiency of the evaporimeter for evaporimeter, evaporimeter
The difference of heat transfer temperature difference=chilled water supply water temperature evaporating temperature, chilled water supply water temperature and chilled water return water temperature can shape
Into chilled water supply backwater temperature difference, i.e. chilled water supply backwater temperature difference=chilled water return water temperature chilled water supply water temperature.
As further scheme of the invention：Heat transfer temperature difference of the heat exchange efficiency of the cooling tower for cooling tower, cooling tower
Heat transfer temperature difference=cold in-water temperature room outside wet-bulb temperature；Heat transfer temperature difference of the heat exchange efficiency of condenser for condenser,
The heat transfer temperature difference of condenser=condensation temperature cooling water leaving water temperature；Its cooling water leaving water temperature and cold in-water temperature
Difference can form cooling water turnover water temperature difference, i.e. cooling water turnover water temperature difference=cooling water leaving water temperature cooling water and enter water temperature
Degree.
As further scheme of the invention：The COP is cold and the ratio of power consumption, and the work of COP and handpiece Water Chilling Units
It is directly proportional as efficiency.
Compared with prior art, beneficial effect of the present invention：
The diagnostic method of this central air-conditioning handpiece Water Chilling Units actual efficiency, by setting up cold to the diagnosis of handpiece Water Chilling Units actual efficiency
Water dispenser group actual efficiency database, as the control foundation of handpiece Water Chilling Units team control, improves central air conditioner system overall efficiency；Simultaneously
Can be additionally used in evaluating handpiece Water Chilling Units health status, instruct equipment management personnel to be predicted formula maintenance, improve operating efficiency, reduce
Maintenance cost.
Description of the drawings
Fig. 1 is the fundamental diagram of the handpiece Water Chilling Units of the present invention；
Fig. 2 is the handpiece Water Chilling Units freezing side heat transfer temperature difference schematic 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- handpiece Water Chilling Units；2- compressors；3- condensers；4- choke valves；5- evaporimeters；6- chilled water pumps；7- is cooled down
Water pump；8- cooling towers.
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 is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.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 creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1 is referred to, in the embodiment of the present invention, a kind of central air-conditioning handpiece Water Chilling Units, including handpiece Water Chilling Units 1, handpiece Water Chilling Units 1
It is made up of compressor 2, condenser 3, choke valve 4 and evaporimeter 5, compressor 2 is used to drive refrigerant circulation stream as power source
It is dynamic, then the transmission that heat is realized in heat exchange is carried out by evaporimeter 5 and condenser 3；The high temperature and high pressure gas exhaust of its compressor 2
Mouth is connected with the high temperature and high pressure gas air inlet of condenser 3 by pipeline, and condenser 3 carries out an exothermic process；Compressor 2
Low-voltage high-temperature refrigerant vapor air entry is connected with the low-voltage high-temperature refrigerant vapor exhaust outlet of evaporimeter 5 by pipeline, and evaporimeter 5 enters
The process of one heat absorption of row；The low-temperature low-pressure refrigerant liquid inlet of evaporimeter 5 is connected with choke valve 4 by pipeline, choke valve 4
High pressure low temperature refrigerant liquid inlet port be connected with the outlet of the cryogenic high pressure refrigerant liquid of condenser 3 by pipeline；
Chilled water pump 6 and cooling water pump 7 are circumscribed with the port of handpiece Water Chilling Units 1 also, chilled water pump 6 is by pipeline and handpiece Water Chilling Units 1
Evaporimeter 5 connect；The Single port of cooling water pump 7 is connected with the condenser 3 in handpiece Water Chilling Units 1 by pipeline, cooling water pump 7
Another port is plugged on cooling tower 8 by pipeline；The efficiency of handpiece Water Chilling Units 1 is proportional with the temperature of evaporimeter 5, its steaming
The operating efficiency for sending out the temperature more high then handpiece Water Chilling Units 1 of device 5 is higher；The efficiency of handpiece Water Chilling Units 1 is inversely proportional to the temperature of condenser 3
Relation, the i.e. temperature of condenser 3 are lower, and the operating efficiency of handpiece Water Chilling Units 1 is higher, and the temperature of condenser 3 is higher, handpiece Water Chilling Units 1
Operating efficiency it is lower.
Table 1 and Fig. 1-3, a kind of diagnostic method of central air-conditioning handpiece Water Chilling Units actual efficiency are referred to, including affects cold water
The efficiency factor of unit 1 and the actual efficiency database for setting up handpiece Water Chilling Units 1, affect the efficiency factor of handpiece Water Chilling Units 1 to be divided into interior
Portion's factor and external factor, internal factor are rate of load condensate, by the operative configuration of handpiece Water Chilling Units 1, manufacture level, compressor 2 property
The species of energy and required cold-producing medium is determined；External factor depends on evaporating temperature and condensation temperature, and evaporating temperature includes freezing
The heat exchange efficiency of water supply water temperature, chilled water return water temperature and evaporimeter 5；Chilled water transfers heat to system by evaporimeter 5
Cryogen, middle to there are two heat transfer temperature differences, under certain refrigeration duty demand chilled water supply water temperature setting, evaporimeter 5 is changed
Heat transfer temperature difference of the thermal efficiency for evaporimeter 5, the heat transfer temperature difference=chilled water supply water temperature evaporating temperature of evaporimeter 5, chilled water
The difference of supply water temperature and chilled water return water temperature can form chilled water supply backwater temperature difference, i.e. chilled water supply backwater temperature difference=freezing
Water return water temperature chilled water supply water temperature；Condensation temperature includes outdoor wet-bulb temperature, the heat exchange efficiency of cooling tower 8, cooling water
The heat exchange efficiency of inflow temperature, cooling water leaving water temperature and condenser 3；Heat is transported to three mistakes of outdoor experience from handpiece Water Chilling Units
Journey：In condenser 3, cold-producing medium condensation heat is passed to cooling water, cooling water and heat is carried to cooling tower 8, cooling from handpiece Water Chilling Units 1
In tower 8, cooling water is exchanged heat with outdoor air, middle to there are three heat transfer temperature differences：Condenser heat transfer temperature difference, cooling water turnover water temperature
Difference and cooling tower heat transfer temperature difference, outdoor wet-bulb temperature depend primarily on outdoor climate situation, it is impossible to control, so changing in certain
Under heat, condensation temperature depends on the heat transfer temperature difference of cooling tower 8, cooling water turnover water temperature difference and condenser heat transfer temperature difference；Cooling
Heat transfer temperature difference of the heat exchange efficiency of tower 8 for cooling tower 8, wet bulb outside the heat transfer temperature difference=cold in-water temperature room of cooling tower 8
Temperature；Heat transfer temperature difference of the heat exchange efficiency of condenser 3 for condenser 3, the heat transfer temperature difference=condensation temperature cooling water of condenser 3
Leaving water temperature；Its cooling water leaving water temperature can form cooling water turnover water temperature difference with the difference of cold in-water temperature, that is, cool down
Water passes in and out water temperature difference=cooling water leaving water temperature cold in-water temperature；The heat transfer temperature difference reflection of its cooling tower 8 is cooling
The heat exchange property of tower 8, heat exchange property are better, then condensation temperature is lower, and cooling water supply backwater temperature difference is to affect condensation temperature
Another key factor, the temperature difference are less, and condensation temperature is lower, but cooling water flow also accordingly increases, the heat transfer temperature difference of condenser 3
What is reflected is the heat exchange property of condenser 3, and the factor of impact has the design reasons of condenser 3 in itself, also relevant with operational management, such as
Fouling.
The actual efficiency database for setting up handpiece Water Chilling Units 1 is divided into direct factor and indirect factor, and direct factor includes load
Demand, load factor, evaporating temperature and condensation temperature, which is made according to different load demand, load factor, evaporating temperature, condensation temperature
Record in the COP of handpiece Water Chilling Units 1 for variable, COP is cold and the ratio of power consumption, and the operating efficiency of COP and handpiece Water Chilling Units 1
It is directly proportional；Indirect factor includes the heat exchange of evaporator heat exchange efficiency, condenser heat exchange efficiency, cooling water pump conveying capacity and cooling tower
Performance, which introduces and individually sets up database or Mathematical Modeling as external data, for calculating evaporating temperature and condensation temperature
Degree.
Table 1
In sum：The diagnostic method of this central air-conditioning handpiece Water Chilling Units actual efficiency, by 1 actual efficiency of handpiece Water Chilling Units
1 actual efficiency database of handpiece Water Chilling Units is set up in diagnosis, as the control foundation of 1 team control of handpiece Water Chilling Units, improves central air conditioner system
Overall efficiency；Can be additionally used in simultaneously evaluating 1 health status of handpiece Water Chilling Units, instruct equipment management personnel to be predicted formula maintenance, carry
High workload efficiency, reduction maintenance cost.
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 spirit or essential attributes without departing substantially from 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 is required rather than described above is limited, 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 and limit involved claim.
Moreover, it will be appreciated that although this specification is been described by according to embodiment, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity
Using specification as an entirety, the technical scheme in each embodiment can also Jing it is appropriately combined, form those skilled in the art
Understandable other embodiment.
Claims (7)
1. a kind of central air-conditioning handpiece Water Chilling Units, including handpiece Water Chilling Units (1), it is characterised in that：The handpiece Water Chilling Units (1) are by compressor
(2), condenser (3), choke valve (4) and evaporimeter (5) composition, the high temperature and high pressure gas exhaust outlet of compressor (2) pass through pipeline
It is connected with the high temperature and high pressure gas air inlet of condenser (3), the low-voltage high-temperature refrigerant vapor air entry of compressor (2) passes through pipeline
It is connected with the low-voltage high-temperature refrigerant vapor exhaust outlet of evaporimeter (5)；The low-temperature low-pressure refrigerant liquid inlet of the evaporimeter (5)
It is connected with choke valve (4) by pipeline, the high pressure low temperature refrigerant liquid inlet port of choke valve (4) passes through pipeline and condenser
(3) the outlet connection of cryogenic high pressure refrigerant liquid；Chilled water pump is circumscribed with also on the port of the handpiece Water Chilling Units (1)
(6) and cooling water pump (7), chilled water pump (6) is connected with the evaporimeter (5) in handpiece Water Chilling Units (1) by pipeline；The cooling water
The Single port of pump (7) is connected with the condenser (3) in handpiece Water Chilling Units (1) by pipeline, and the another port of cooling water pump (7) passes through
Pipeline is plugged on cooling tower (8).
2. a kind of diagnostic method of central air-conditioning handpiece Water Chilling Units actual efficiency, including affect handpiece Water Chilling Units (1) efficiency factor and
Set up the actual efficiency database of handpiece Water Chilling Units (1), it is characterised in that：The efficiency factor of handpiece Water Chilling Units (1) is affected to be divided into inside
Factor and external factor, internal factor are rate of load condensate, by the operative configuration of handpiece Water Chilling Units (1), manufacture level, compressor (2)
The species of performance and required cold-producing medium is determined；External factor depends on evaporating temperature and condensation temperature, and evaporating temperature includes cold
Freeze the heat exchange efficiency of water supply water temperature, chilled water return water temperature and evaporimeter (5)；Condensation temperature includes outdoor wet-bulb temperature, cold
But the heat exchange efficiency of the heat exchange efficiency of tower (8), cold in-water temperature, cooling water leaving water temperature and condenser (3)；
The actual efficiency database for setting up handpiece Water Chilling Units (1) is divided into direct factor and indirect factor, and direct factor includes that load is needed
Ask, load factor, evaporating temperature and condensation temperature, which is recorded in the COP of handpiece Water Chilling Units (1) as variable；Indirect factor includes
Evaporator heat exchange efficiency, condenser heat exchange efficiency, cooling water pump conveying capacity and cooling tower heat exchange property, which is used as external data
Introduce and individually set up database or Mathematical Modeling.
3. a kind of central air-conditioning handpiece Water Chilling Units according to claim 1, it is characterised in that：The effect of the handpiece Water Chilling Units (1)
Rate is proportional with the temperature of evaporimeter (5).
4. a kind of central air-conditioning handpiece Water Chilling Units according to claim 1, it is characterised in that：The effect of the handpiece Water Chilling Units (1)
The temperature of rate and condenser (3) is inversely.
5. the diagnostic method of a kind of central air-conditioning handpiece Water Chilling Units actual efficiency according to claim 2, it is characterised in that：Institute
The heat transfer temperature difference of the heat exchange efficiency for evaporimeter (5) of evaporimeter (5) is stated, the heat transfer temperature difference=chilled water of evaporimeter (5) supplies water temperature
The difference of degree evaporating temperature, chilled water supply water temperature and chilled water return water temperature can form chilled water supply backwater temperature difference, i.e., cold
Freeze water supply backwater temperature difference=chilled water return water temperature chilled water supply water temperature.
6. the diagnostic method of a kind of central air-conditioning handpiece Water Chilling Units actual efficiency according to claim 2, it is characterised in that：Institute
The heat transfer temperature difference of the heat exchange efficiency for cooling tower (8) of cooling tower (8) is stated, the heat transfer temperature difference=cooling water of cooling tower (8) enters water temperature
The outdoor wet-bulb temperature of degree；Heat transfer temperature difference of the heat exchange efficiency of condenser (3) for condenser (3), the heat transfer temperature difference of condenser (3)
=condensation temperature cooling water leaving water temperature；Its cooling water leaving water temperature can form cooling water with the difference of cold in-water temperature
Turnover water temperature difference, i.e. cooling water turnover water temperature difference=cooling water leaving water temperature cold in-water temperature.
7. the diagnostic method of a kind of central air-conditioning handpiece Water Chilling Units actual efficiency according to claim 2, it is characterised in that：Institute
State COP and be directly proportional to the operating efficiency of handpiece Water Chilling Units (1) for cold and the ratio of power consumption, and COP.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107461970A (en) * | 2017-07-19 | 2017-12-12 | 青岛海尔空调电子有限公司 | A kind of water chilling unit control method with evaporative condenser |
| WO2018223263A1 (en) * | 2017-06-05 | 2018-12-13 | 深圳市建恒测控股份有限公司 | Method for calculating effective heat and energy efficiency of air-conditioning system and method for displaying energy flow diagram |
| CN109000949A (en) * | 2018-06-29 | 2018-12-14 | 广州能迪能源科技股份有限公司 | Water cooler appraisal procedure and power-economizing method based on water cooler thermodynamical model |
| CN109282421A (en) * | 2018-08-10 | 2019-01-29 | 浙江理工大学 | A kind of water cooler fault diagnosis simulator |
| CN109654707A (en) * | 2019-02-21 | 2019-04-19 | 陈碧贤 | Energy-saving control method for central air conditioner based on edge effect |
| 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 |
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| TWI703573B (en) * | 2019-10-17 | 2020-09-01 | 中國鋼鐵股份有限公司 | Prediction method for predicting temperature of liquid produced by cooling tower |
| WO2021036510A1 (en) * | 2019-08-30 | 2021-03-04 | 珠海格力电器股份有限公司 | Water chilling unit, outlet water regulating method, and air-conditioning system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018223263A1 (en) * | 2017-06-05 | 2018-12-13 | 深圳市建恒测控股份有限公司 | Method for calculating effective heat and energy efficiency of air-conditioning system and method for displaying energy flow diagram |
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| CN109654707A (en) * | 2019-02-21 | 2019-04-19 | 陈碧贤 | Energy-saving control method for central air conditioner based on edge effect |
| 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 |
| WO2021036510A1 (en) * | 2019-08-30 | 2021-03-04 | 珠海格力电器股份有限公司 | Water chilling unit, outlet water regulating method, and air-conditioning system |
| CN110702438A (en) * | 2019-09-23 | 2020-01-17 | 天津大学 | Centrifugal water chilling unit and fresh air system combined fault diagnosis method |
| CN110702438B (en) * | 2019-09-23 | 2020-09-18 | 天津大学 | Centrifugal water chilling unit and fresh air system combined fault diagnosis method |
| TWI703573B (en) * | 2019-10-17 | 2020-09-01 | 中國鋼鐵股份有限公司 | Prediction method for predicting temperature of liquid produced by cooling tower |
| CN110953684A (en) * | 2019-12-20 | 2020-04-03 | 珠海格力电器股份有限公司 | Control method of air conditioner cooling system and air conditioner |
| CN113218037A (en) * | 2020-01-21 | 2021-08-06 | 东元电机股份有限公司 | Ice water main machine maintenance estimation system and method |
| WO2024046434A1 (en) * | 2022-08-31 | 2024-03-07 | 青岛海信日立空调系统有限公司 | Water-chilling unit air-conditioning system and control method therefor |
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