CN110906477A - Efficient and stable magnetic suspension water chilling unit, control method and device - Google Patents
Efficient and stable magnetic suspension water chilling unit, control method and device Download PDFInfo
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- CN110906477A CN110906477A CN201911083009.2A CN201911083009A CN110906477A CN 110906477 A CN110906477 A CN 110906477A CN 201911083009 A CN201911083009 A CN 201911083009A CN 110906477 A CN110906477 A CN 110906477A
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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
- F24F5/0007—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 cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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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
- F24F11/62—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
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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
- F24F11/62—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
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/70—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
- F24F11/84—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 using valves
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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
- F24F11/70—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
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/13—Economisers
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses an efficient and stable magnetic suspension water chilling unit, a control method and a device, wherein the water chilling unit can effectively increase the supercooling degree of a refrigerant by adopting a liquid post-taking mode, so that the flash of the refrigerant is reduced, and the energy efficiency ratio of the whole water chilling unit is improved; the control method comprises the steps of carrying out load calculation through the actual outlet water temperature, setting the target outlet water temperature, adjusting the working state of a compressor of the water chilling unit by comparing the actual outlet water temperature with the target outlet water temperature and combining the difference value of the actual outlet water temperature and the target outlet water temperature with the starting temperature difference or the stopping temperature difference, dividing the working state of the water chilling unit into four working states of loading corresponding load in each period, increasing the compressor, unloading corresponding load in each period and reducing the starting number of the compressor, improving the control precision of the water chilling unit, reducing the starting and stopping frequency of the compressor and enabling the operation of the system to be more stable and reliable.
Description
Technical Field
The invention relates to the field of air-conditioning refrigeration devices and control thereof, in particular to a high-efficiency and stable magnetic suspension water chilling unit, a control method and a device.
Background
The magnetic suspension water chiller has the advantages of energy conservation, high efficiency, low operation noise and vibration, high efficiency, no friction loss, low starting current, low daily maintenance cost, environmental protection, high system sustainability and the like, and plays an important role in central air conditioners.
The existing magnetic suspension water chilling unit generally adjusts the running state of each component by taking the inlet water temperature or the outlet water temperature of chilled water as a reference temperature so as to reach the required current temperature.
If the running states of all components of the water chilling unit are adjusted by the water chilling unit by taking the outlet water temperature of chilled water as a target to be constant within a set temperature range, when the actual load is small, the inlet and outlet water temperatures are low, and energy waste is easily caused; and because the user load is changeable, the water chilling unit is controlled only according to the deviation between the actual water temperature and the target water temperature, the main machine of the water chilling unit is frequently loaded and unloaded, even continuously started and stopped, the stability of the system is poor, and the use experience of a user is influenced.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an efficient and stable magnetic suspension water chilling unit, and aims to solve the technical problems that the magnetic suspension water chilling unit in the prior art is unstable in operation and low in energy efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
a control method of an efficient and stable magnetic suspension water chilling unit comprises the following steps:
setting a target temperature T1Start temperature difference △1And shutdown temperature difference △2The water temperature acquisition module acquires the actual outlet water temperature T2；
Calculating the actual water outlet temperature T2And a target temperature T1Difference value △ of3And a starting temperature difference △1Comparing;
when T is2>T1And △1>△3When the water temperature is changed, the compressor loads corresponding load percentage in each period to adapt to the change of the water temperature;
when T is2>T1And △3>△1Increasing the number of the compressors to be started;
when T is2≤T1And T1-T2<△2The compressor unloads the corresponding load percentage in each period to adapt to the change of the water temperature;
when T is1-T2>△2The number of compressor starts is reduced.
In the control method of the high-efficiency and stable magnetic suspension water chilling unit, whether the system pressure ratio meets the starting pressure ratio of the compressor needs to be judged before the starting number of the compressors is increased.
In the control method of the high-efficiency stable magnetic suspension water chilling unit, when the system pressure ratio does not meet the starting pressure ratio of the compressor, the bypass valves of other compressors in the water chilling unit are gradually opened until the compressor needing to be started is started, and then the bypass valves of other compressors are gradually closed;
and when the actual rotating speed of the compressor reaches the sum of the motor starting speed and the motor starting speed deviation, gradually closing all the bypass valves.
The control method of the high-efficiency stable magnetic suspension water chilling unit further comprises the step of increasing the starting number of the compressors when the load of the current compressor exceeds the starting energy consumption of the compressors.
In the control method of the high-efficiency stable magnetic suspension water chilling unit, when the control system closes the compressor, all the bypass valves are gradually opened, and the compressor is closed in a delayed manner.
The control method of the high-efficiency stable magnetic suspension water chilling unit further comprises the step of reducing the starting number of the compressors when the load of the current compressor is lower than the stop energy consumption of the compressor.
In the control method of the high-efficiency stable magnetic suspension water chilling unit, an electronic expansion valve of an economizer is in a forced closing state in the process of starting or stopping a compressor; under other states, the opening degree is controlled by current and superheat degree; the main electronic expansion valve adopts PID closed loop control, and the signal of the liquid level sensor is collected as feedback for adjusting the liquid level.
A control device of a magnetic suspension water chilling unit comprises:
the water temperature acquisition module is used for acquiring the actual outlet water temperature set by the water chilling unit;
the operation module is used for calculating the difference value between the actual outlet water temperature and the target temperature and comparing the difference value between the actual outlet water temperature and the target temperature with the starting temperature difference or the stopping temperature difference;
and the control module is used for adjusting the load of the water chilling unit according to the operation result of the operation module.
A magnetic suspension water chilling unit is controlled by the control method and comprises a plurality of magnetic suspension centrifugal compressors, a condenser, a drying filter, an economizer and an evaporator which are sequentially connected through pipelines, wherein the outlet end of the drying filter is further connected with the compressors and the evaporator through pipelines respectively, and the economizer is further connected with the magnetic suspension centrifugal compressors through pipelines.
A non-transitory computer-readable storage medium storing a computer program implementing the control method of a magnetic levitation chiller as described above.
Has the advantages that:
the invention provides an efficient and stable magnetic suspension water chilling unit, a control method and a device, wherein the water chilling unit can effectively increase the supercooling degree of a refrigerant by adopting a liquid post-taking mode, so that the flash of the refrigerant is reduced, and the energy efficiency ratio of the whole water chilling unit is improved; the control method improves the control precision of the water chilling unit by matching the actual water outlet temperature with the target temperature, the starting temperature difference and the stopping temperature difference, so that the system is more stable and reliable in operation.
Drawings
Fig. 1 is a schematic diagram of the control relationship of the control device of the magnetic suspension water chilling unit.
Fig. 2 is a schematic diagram of connection relationships among components in the water chilling unit provided by the invention.
Description of the main element symbols: the system comprises a compressor, a condenser, a drying filter, a 4-economizer, an evaporator, a 6-liquid viewing mirror, a main electronic expansion valve, an 8-electronic expansion valve, a 100-water temperature acquisition module, a 200-operation module and a 300-control module, wherein the compressor is connected with the condenser, the drying filter is connected with the condenser, and the economizer is connected with the evaporator.
Detailed Description
The invention provides a high-efficiency stable magnetic suspension water chilling unit, a control method and a device, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail by referring to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a control method of a high-efficiency and stable magnetic suspension water chilling unit, which comprises the following steps:
setting a target temperature T1Start temperature difference △1And stopMachine temperature difference △2The water temperature obtaining module 100 obtains the actual outlet water temperature T2And the control module of the water chilling unit carries out load calculation according to the temperature of the outlet water and judges whether the working state of the compressor 1 is changed or not.
The operation module 200 calculates the actual outlet water temperature T2And a target temperature T1Difference value △ of3And a starting temperature difference △1Comparing;
when T is2>T1And △1>△3When the outlet water temperature is higher than the target temperature value and does not reach the starting temperature difference, the compressor 1 loads corresponding load percentage in each period to adapt to the change of the water temperature;
when T is2>T1And △3>△1When the outlet water temperature exceeds the starting temperature difference or the load of the current compressor 1 exceeds the starting energy consumption of the compressor 1, the control module sends an instruction to start more compressors 1; at this time, it is first determined whether the system pressure ratio satisfies the start pressure ratio of the compressor 1. Each compressor 1 is provided with an on-off signal receiving board, and the on-off signal receiving board is controlled to be switched on or switched off through a control module according to the actual load.
When the system pressure ratio does not meet the starting pressure ratio of the compressor 1, gradually opening the bypass valves of other compressors 1 in the water chilling unit until the compressor 1 needing to be started is started, gradually closing the bypass valves of other compressors 1, and reducing the pressure ratio to be lower than the starting pressure ratio.
When the system pressure ratio meets the starting pressure ratio, gradually opening the bypass valve of the compressor 1 to be started, gradually increasing the rotating speed of the compressor 1, and when the actual rotating speed of the compressor 1 reaches the sum of the motor starting speed and the motor starting speed deviation and the climbing state is finished, finishing the starting of the compressor 1 and gradually closing all the bypass valves.
When T is2≤T1And T1-T2<△2When the outlet water temperature is lower than the target temperature but does not reach the shutdown temperature difference, the compressor 1 unloads the corresponding load percentage in each period to adapt to the change of the water temperature;
when T is1-T2>△2When the actual outlet water temperature is lower than the difference value between the target temperature and the shutdown temperature difference, or the load of the current compressor 1 is lower than the shutdown energy consumption of the compressor 1, the control module judges whether to close one compressor 1 in the water chilling unit, and when the control system closes the compressor 1, all bypass valves are gradually opened to reduce the pressure ratio of the compressor 1, and the compressor 1 is closed in a delayed mode.
Specifically, in the process of starting or stopping the compressor 1, the electronic expansion valve 8 of the economizer 4 is in a forced closing state; in other states (the compressor is in normal operation and closed state), the opening degree is controlled by current and superheat degree; the main electronic expansion valve 7 adopts PID (proportion-integral-derivative) to carry out closed-loop control, collects a liquid level sensor signal as feedback, compares the feedback with a set value, outputs and adjusts the opening degree of the main electronic expansion valve 7, adjusts the liquid level to the set value, and keeps the corresponding suction superheat degree.
According to the control method, the working state of the water chilling unit is controlled through 4 temperature stages, the control accuracy of the water chilling unit is improved, the starting and stopping frequency of the compressor 1 is reduced, and therefore the system is stable and reliable in operation.
Referring to fig. 1, a control device for a magnetic suspension chiller includes:
the water temperature acquisition module 100 is used for acquiring the actual outlet water temperature set by the water chilling unit;
the operation module 200 is used for calculating a difference value between the actual outlet water temperature and the target temperature, and comparing the actual outlet water temperature and the target temperature difference value with the starting temperature difference or the stopping temperature difference;
and the control module 300 is configured to adjust the load of the water chilling unit according to the operation result of the operation module 200.
The water temperature acquisition module 100 and the operation module 200 are respectively electrically connected with the control module 300, the control module 300 receives information such as the actual outlet water temperature acquired by the water temperature acquisition module 100 and feeds back the information to the operation module 200, the operation module 200 compares the actual outlet water temperature with the current temperature, compares the difference value between the actual outlet water temperature and the target temperature with the starting temperature difference or the stopping temperature difference, and feeds back the information to the control module 300, and the control module 300 judges whether to increase or unload the load of the compressor 1 or increase/decrease the number of the compressors 1 according to the operation result so as to keep the actual outlet water temperature of the water chilling unit to reach the target temperature.
Referring to fig. 2, the magnetic suspension water chilling unit is controlled by the control method, and includes a plurality of magnetic suspension centrifugal compressors 1, a condenser 2, a drying filter 3, an economizer 4 and an evaporator 5 which are sequentially connected through pipelines, an outlet end of the drying filter 3 is further connected with the compressors 1 and the evaporator 5 through pipelines, and the economizer 4 is further connected with the magnetic suspension centrifugal compressors 1 through pipelines.
The magnetic suspension centrifugal compressor 1 comprises a plurality of compressors, and each compressor 1 is provided with an exhaust port and a return port; the condenser 2 comprises one of an evaporative condenser, a water-cooled condenser or an air-cooled condenser, and in the embodiment, the condenser is the evaporative condenser; the evaporator includes one of a flooded evaporator, a dry evaporator, or a falling film evaporator, and in the present embodiment, the evaporator is a flooded evaporator.
An exhaust port of each magnetic suspension centrifugal compressor 1 is communicated with a first inlet of the condenser 2, and each magnetic suspension centrifugal compressor 1 corresponds to one cooling flow path; in a cooling flow path, high-temperature and high-pressure refrigerant gas enters the condenser 2 from an exhaust port of the magnetic suspension compressor 1 through a first inlet of the condenser 2 to be condensed and cooled into liquid, then flows out of a first outlet of the condenser 2 to enter the drying filter 3, and the dried and filtered coolant is divided into three paths. Wherein, a bypass is communicated with a motor cooling interface of the magnetic suspension centrifugal compressor 1, a liquid viewing mirror 6 is arranged on a communicating pipeline of the bypass, and the dry filter 3 and the liquid viewing mirror 6 ensure that the liquid coolant without impurities enters the motor of the magnetic suspension centrifugal compressor 1. The other bypass is communicated to the bottom of the evaporator 5, an electronic expansion valve 8 is arranged on the bypass, the flow of the liquid refrigerant on the bypass is controlled by the electronic expansion valve 8, the start-up and stop pressure ratio of the magnetic suspension centrifugal compressor 1 is reduced, the service life of the magnetic suspension centrifugal compressor 1 is prolonged, and the running stability of the system is improved. The main refrigerant liquid of the third path enters the first side of the economizer 4, a second outlet is arranged on the first side, the second outlet is connected to the flooded evaporator 5 through a pipeline, one path of liquid refrigerant is led to enter the second side, opposite to the first side, of the economizer 4 after being throttled by the electronic expansion valve 8 on the pipeline, the main refrigerant is used for cooling the main refrigerant, a third outlet is arranged in the second side of the economizer 4, the third outlet is communicated with the economizer port of the compressor 1, a heat exchange mode of back liquid taking countercurrent is formed, the supercooling degree of the refrigerant of the system can be effectively increased, and the energy efficiency ratio of the system is improved. After the temperature of the economizer 4 is reduced, the main refrigerant enters the flooded evaporator 5 after being throttled by the main electronic expansion valve 7, and the refrigerant gas evaporated in the evaporator 5 enters the suction side of the magnetic suspension centrifugal compressor 1 through a pipeline and the air return port of the magnetic suspension centrifugal compressor 1, so that a refrigeration cycle is completed.
A non-transitory computer-readable storage medium storing a computer program implementing the control method of a magnetic levitation chiller as described above.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. A control method of an efficient and stable magnetic suspension water chilling unit is characterized by comprising the following steps:
setting a target temperature T1Start temperature difference △1And shutdown temperature difference △2The water temperature acquisition module acquires the actual outlet water temperature T2；
Calculating the actual water outlet temperature T2And a target temperature T1Difference value △ of3And a starting temperature difference △1Comparing;
when T is2>T1And △1>△3When the water temperature is changed, the compressor loads corresponding load percentage in each period to adapt to the change of the water temperature;
when T is2>T1And △3>△1Increasing the number of the compressors to be started;
when T is2≤T1And T1-T2<△2The compressor unloads the corresponding load percentage in each period to adapt to the change of the water temperature;
when T is1-T2>△2The number of compressor starts is reduced.
2. The control method for the high-efficiency stable magnetic suspension water chilling unit according to claim 1, wherein before increasing the number of the compressors, it is necessary to determine whether the system pressure ratio satisfies the start pressure ratio of the compressors.
3. The control method of the high-efficiency stable magnetic suspension water chilling unit according to claim 2, characterized in that when the system pressure ratio does not meet the starting pressure ratio of the compressor, the bypass valves of other compressors in the water chilling unit are gradually opened until the compressor needing to be started is started and then the bypass valves of other compressors are gradually closed;
and when the actual rotating speed of the compressor reaches the sum of the motor starting speed and the motor starting speed deviation, gradually closing all the bypass valves.
4. The control method for the high-efficiency stable magnetic suspension water chilling unit according to claim 2, further comprising increasing the number of the compressors to be turned on when the load of the current compressor exceeds the starting energy consumption of the compressor.
5. The control method for the high-efficiency stable magnetic suspension water chilling unit according to any one of claim 1, wherein when the control system turns off the compressor, all the bypass valves are gradually opened, and the compressor is turned off in a delayed manner.
6. The control method for the high-efficiency stable magnetic suspension water chilling unit according to claim 5, further comprising reducing the number of the compressors to be started when the load of the current compressor is lower than the stop energy consumption of the compressor.
7. The control method of the high-efficiency stable magnetic suspension water chilling unit according to any one of claim 1, wherein during starting or stopping of the compressor, the electronic expansion valve of the economizer is in a forced closing state; under other states, the opening degree is controlled by current and superheat degree; the main electronic expansion valve adopts PID closed loop control, and the signal of the liquid level sensor is collected as feedback for adjusting the liquid level.
8. A control device of a magnetic suspension water chilling unit is characterized by comprising:
the water temperature acquisition module is used for acquiring the actual outlet water temperature set by the water chilling unit;
the operation module is used for calculating the difference value between the actual outlet water temperature and the target temperature and comparing the difference value between the actual outlet water temperature and the target temperature with the starting temperature difference or the stopping temperature difference;
and the control module is used for adjusting the load of the water chilling unit according to the operation result of the operation module.
9. A magnetic suspension water chilling unit is characterized by being controlled by the control method of any one of claims 1-7, and comprising a plurality of magnetic suspension centrifugal compressors, a condenser, a drying filter, an economizer and an evaporator which are sequentially connected through pipelines, wherein the outlet end of the drying filter is further connected with the compressors and the evaporator through pipelines respectively, and the economizer is further connected with the magnetic suspension centrifugal compressors through pipelines.
10. A non-transitory computer-readable storage medium storing a computer program, wherein the program implements the method of controlling a magnetic levitation chiller as set forth in any one of claims 1-7.
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| CN201911083009.2A CN110906477B (en) | 2019-11-07 | 2019-11-07 | Efficient and stable magnetic suspension water chilling unit, control method and device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111426088A (en) * | 2020-04-20 | 2020-07-17 | 珠海格力电器股份有限公司 | Air conditioner control method and device and air conditioner system |
| CN113108393A (en) * | 2021-05-31 | 2021-07-13 | 南通华信中央空调有限公司 | Energy adjusting method for air-conditioning water system |
| CN113339962A (en) * | 2021-05-12 | 2021-09-03 | 北京市建筑设计研究院有限公司 | Control method of airplane ground air conditioning system |
| CN113945021A (en) * | 2021-10-29 | 2022-01-18 | 青岛海尔空调电子有限公司 | Method and device for controlling starting and stopping of water chilling unit and water chilling unit |
| CN113983729A (en) * | 2021-12-02 | 2022-01-28 | 博锐尚格科技股份有限公司 | Method and device for judging bypass operation of water chilling unit |
| CN114508808A (en) * | 2022-03-08 | 2022-05-17 | 青岛海信日立空调系统有限公司 | Magnetic suspension variable frequency water chilling unit |
| CN115046339A (en) * | 2022-05-13 | 2022-09-13 | 青岛澳柯玛生物医疗有限公司 | Parallel control system and method for variable frequency press |
| WO2023005451A1 (en) * | 2021-07-30 | 2023-02-02 | 青岛海尔空调电子有限公司 | Control method for water chilling unit |
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| CN115046339A (en) * | 2022-05-13 | 2022-09-13 | 青岛澳柯玛生物医疗有限公司 | Parallel control system and method for variable frequency press |
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