CN110986406A - Multi-split VRV device for machine room, control method and system - Google Patents
Multi-split VRV device for machine room, control method and system Download PDFInfo
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- CN110986406A CN110986406A CN201911319822.5A CN201911319822A CN110986406A CN 110986406 A CN110986406 A CN 110986406A CN 201911319822 A CN201911319822 A CN 201911319822A CN 110986406 A CN110986406 A CN 110986406A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003507 refrigerant Substances 0.000 claims abstract description 138
- 238000001816 cooling Methods 0.000 claims abstract description 110
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 238000005057 refrigeration Methods 0.000 abstract description 33
- 239000007788 liquid Substances 0.000 description 9
- 238000004378 air conditioning Methods 0.000 description 7
- 230000005494 condensation Effects 0.000 description 7
- 238000009833 condensation Methods 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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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
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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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
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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
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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
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
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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
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control 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
- 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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a multi-online VRV device for a machine room, a control method and a system, which comprise a variable frequency compressor, an air-cooled condenser, a water-cooled heat exchanger, a water-cooled electromagnetic valve, an air-cooled electromagnetic valve, a temperature sensor and a plurality of tail ends, wherein the water-cooled electromagnetic valve is arranged on a pipeline communicated with the variable frequency compressor and the water-cooled heat exchanger; the air-cooled electromagnetic valve is arranged on a pipeline communicated with the variable frequency compressor and the air-cooled condenser; the tail ends of the temperature sensors are respectively communicated with outlets of refrigerants in the water-cooling heat exchanger and the air-cooling condenser through pipelines, and the temperature sensors are arranged outdoors and used for measuring the temperature of outdoor air. The refrigeration efficiency of a plurality of tail ends is improved, and the shutdown risk of the VRV of the multi-split air conditioner is reduced; the running deviation of the refrigeration system from the running curve of the system is reduced, the condition that the running service life of a refrigeration part is reduced, and the refrigeration system has the advantages of improving the efficiency of the refrigeration system and increasing the reliability of the refrigeration system.
Description
Technical Field
The invention relates to the field of multi-split VRV cooling for a machine room, in particular to a multi-split VRV device for a machine room, a control method and a control system.
Background
At present, increasingly strong energy conservation and emission reduction and green environmental protection requirements worldwide put forward higher requirements on energy consumption and cold quantity requirements of data centers in subway operation and IT industries; the reliability and stability of energy conservation and refrigeration system operation have become a primary appeal to industry owners and design builders.
The conventional multi-online VRV operation system is single and cannot meet the operation modes of various conditions of equipment rooms, and under the general conditions, the machine room and the subway equipment room are both in terminal refrigeration, so that the system is different from the conventional household and commercial multi-online VRV system in a certain way and has no terminal heating condition. The VRV device of the air-cooled multi-split air conditioner has the main defects that when the temperature is high in summer, the condensing pressure is too high due to too high outdoor temperature, the refrigerating efficiency is reduced, and the refrigerating capacity does not meet the requirements of equipment rooms; the VRV device of the multi-split air conditioning system mainly has the defects that the outdoor temperature is too low in winter, the water-cooling inlet water temperature is possibly low, the condensation pressure of the refrigerant is too low when heat exchange is carried out with the refrigerant, the whole multi-split air conditioning system is possibly out of a theoretical pressure curve deviating from the operation of the system, the efficiency of the refrigerating system is reduced due to long-term operation, the service life of a refrigerating part is shortened, and the reliability of the refrigerating system is greatly reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a VRV device for a machine room, which has the advantages of improving the efficiency of a refrigerating system and increasing the reliability of the refrigerating system.
The above object of the present invention is achieved by the following technical solutions:
a VRV device for a machine room comprises a variable frequency compressor, an air-cooled condenser, a water-cooled heat exchanger, a water-cooled electromagnetic valve, an air-cooled electromagnetic valve, a temperature sensor and a plurality of tail ends, wherein the water-cooled electromagnetic valve is arranged on a pipeline communicated with the variable frequency compressor and the water-cooled heat exchanger; the air-cooled electromagnetic valve is arranged on a pipeline communicated with the variable frequency compressor and the air-cooled condenser; the tail ends of the temperature sensors are respectively communicated with outlets of refrigerants in the water-cooling heat exchanger and the air-cooling condenser through pipelines, and the temperature sensors are arranged outdoors and used for measuring the temperature of outdoor air.
By adopting the technical scheme, the temperature sensor collects the outdoor temperature and adopts different operation modes according to different outdoor temperatures. Namely, when the temperature is high, the water-cooling electromagnetic valve is opened and the air-cooling electromagnetic valve is closed, and the refrigerant is conveyed to the water-cooling heat exchanger through the variable frequency compressor for cooling, so that the condensation temperature of the refrigerant is reduced, the refrigeration efficiency of a plurality of tail ends is improved, and the shutdown risk of the VRV of the multi-split air conditioner is reduced; when the temperature is low, the water-cooling electromagnetic valve is closed and the air-cooling electromagnetic valve is opened, and the refrigerant is conveyed to the air-cooling condenser through the variable frequency compressor for cooling, so that the operation curve of the refrigeration system deviating from the system is reduced, and the condition that the operation life of the refrigeration part is reduced. This helps to improve the efficiency and reliability of the refrigeration system.
The present invention in a preferred example may be further configured to: the refrigerant pump, the compression electromagnetic valve and the pump electromagnetic valve are further included, and the compression electromagnetic valve is arranged on a pipeline into which refrigerant enters in the variable frequency compressor; the pump solenoid valve is arranged on a pipeline for the refrigerant to enter in the refrigerant pump.
By adopting the technical scheme, different power mechanisms are adopted to convey the refrigerant according to different outdoor temperatures, namely the compression electromagnetic valve is opened and the pump electromagnetic valve is closed, and the refrigerant is conveyed to the water-cooling heat exchanger or the air-cooling condenser through the variable frequency compressor; and closing the compression electromagnetic valve and opening the pump electromagnetic valve, and conveying the refrigerant to the air-cooled condenser through the refrigerant pump. The refrigerant pump is adopted to provide power for the circulation reciprocation of the refrigerant, so that energy can be saved, and the natural refrigerant is fully utilized.
The present invention in a preferred example may be further configured to: the high-pressure sensor is arranged on an output pipeline of a refrigerant in the variable-frequency compressor and used for collecting the real-time pressure of the refrigerant output from the variable-frequency compressor.
By adopting the technical scheme, the high-pressure sensor collects the pressure of the refrigerant output frequency conversion compressor, and the opening of the water-cooling heat exchanger actuator and the rotating speed of the outdoor fan of the air-cooling condenser are adjusted according to the pressure of the refrigerant, so that the water flow of the water-cooling heat exchanger and the air flow of the air-cooling condenser are adjusted, the running deviation running curve of the refrigerating system is reduced, and the condition that the running service life of a refrigerating part is reduced.
The second aim of the invention is realized by the following technical scheme:
a VRV control method for a multi-split air conditioner for a machine room comprises the steps of collecting outdoor temperature T, and judging the outdoor temperature T and a preset temperature threshold value T in real time1、T2In relation to (b), wherein T1﹥T2If T > T1If so, executing a first operation mode; if T ≧ T2And T is less than or equal to T1If so, executing a first operation mode or a second operation mode; if T < T2If so, executing a second operation mode; the first operation mode is to control the refrigerant to be conveyed into the water-cooling heat exchanger for cooling, and the second operation mode is to control the refrigerant to be conveyed into the air-cooling condenser for cooling.
By adopting the technical scheme, the outdoor temperature is collected, and different operation modes are adopted for different outdoor temperatures. Namely, at high temperature, a water cooling operation mode is adopted, so that the condensation temperature of a refrigerant is reduced, the refrigeration efficiency is improved, and the shutdown risk of the VRV of the multi-split air conditioning unit is reduced; and in low temperature, an air cooling operation mode is adopted, so that the operation deviation of the refrigeration system from the operation curve of the system is reduced, and the condition of reducing the operation service life of the refrigeration part is reduced. This helps to improve the efficiency and reliability of the refrigeration system.
The present invention in a preferred example may be further configured to: real-time judgment of outdoor temperature T and preset temperature threshold T3In relation to (b), wherein T2﹥T3If T < T3When the refrigerant is in use, the refrigerant pump is controlled to provide power for conveying the refrigerant; if T ≧ T3And when the refrigerant is conveyed, the variable frequency compressor is controlled to provide power for conveying the refrigerant.
By adopting the technical scheme, different power mechanisms are adopted to convey the refrigerant according to different outdoor temperatures, and the refrigerant pump is adopted to provide power for the circulation reciprocation of the refrigerant, so that energy can be saved, and natural refrigerant can be fully utilized.
The present invention in a preferred example may be further configured to: if T ≧ T2And T is less than or equal to T1And if so, maintaining the execution of the current operation mode.
By adopting the technical scheme, the times of exchanging the VRV between the first operation mode and the second operation mode are reduced, and the condition of reducing the service life of the refrigeration component is further reduced.
The present invention in a preferred example may be further configured to: also comprises collecting the real-time pressure F of the refrigerant, and judging the real-time pressure F and the optimal pressure F in real time0If the real-time pressure F is at the optimum pressure F0The current water flow of the water-cooled heat exchanger or the air flow of the air-cooled condenser is maintained within the error threshold range; if the real-time pressure F is less than the optimum pressure F0The minimum value of the error threshold value is used for controlling and increasing the water flow of the water-cooling heat exchanger or the air flow of the air-cooling condenser; if the real-time pressure F is greater than maximumGood pressure F0The maximum value of the error threshold value is used for controlling and reducing the water flow of the water-cooled heat exchanger or the air flow of the air-cooled condenser.
By adopting the technical scheme, the pressure of the refrigerant output variable frequency compressor is collected, the water flow of the water-cooling heat exchanger and the air flow of the air-cooling condenser are adjusted according to the pressure of the refrigerant, the running deviation running curve of the refrigerating system is reduced, and the condition that the running service life of a refrigerating part is shortened is reduced.
The third object of the invention is realized by the following technical scheme:
a VRV system for machine room comprises
The outdoor temperature acquisition module is used for acquiring outdoor temperature T;
a first control module for judging the outdoor temperature T and a preset temperature threshold value T1、T2In relation to (b), wherein T1﹥T2If T > T1If so, executing a first operation mode; if T ≧ T2And T is less than or equal to T1If so, executing a first operation mode or a second operation mode; if T < T2If so, executing a second operation mode; the first operation mode is to control the refrigerant to be conveyed into the water-cooling heat exchanger for cooling, and the second operation mode is to control the refrigerant to be conveyed into the air-cooling condenser for cooling.
By adopting the technical scheme, the outdoor temperature is collected by the outdoor temperature collecting module, and the first control module adopts different operation modes according to different outdoor temperatures. Namely, at high temperature, a water cooling operation mode is adopted, so that the condensation temperature of a refrigerant is reduced, the refrigeration efficiency is improved, and the shutdown risk of the VRV of the multi-split air conditioning unit is reduced; and in low temperature, an air cooling operation mode is adopted, so that the operation deviation of the refrigeration system from the operation curve of the system is reduced, and the condition of reducing the operation service life of the refrigeration part is reduced. This helps to improve the efficiency and reliability of the refrigeration system.
The present invention in a preferred example may be further configured to: also comprises
A second control module for judging the outdoor temperature T and the preset temperature threshold value T3The relationship between the two or more of them,wherein T is2﹥T3If T < T3When the refrigerant is in use, the refrigerant pump is controlled to provide power for conveying the refrigerant; if T ≧ T3And when the refrigerant is conveyed, the variable frequency compressor is controlled to provide power for conveying the refrigerant.
By adopting the technical scheme, the second control module adopts different power mechanisms to convey the refrigerant according to different outdoor temperatures, and the refrigerant pump is adopted to provide power for the circulation reciprocation of the refrigerant, so that energy can be saved, and natural refrigerant can be fully utilized.
The present invention in a preferred example may be further configured to: also comprises
The pressure acquisition module is used for acquiring the actual pressure F of the refrigerant discharged from the variable frequency compressor;
a third control module for judging the real-time pressure F and the optimal pressure F0If the real-time pressure F is at the optimum pressure F0The current water flow of the water-cooled heat exchanger or the air flow of the air-cooled condenser is maintained within the error threshold range; if the real-time pressure F is less than the optimum pressure F0The minimum value of the error threshold value is used for controlling and increasing the water flow of the water-cooling heat exchanger or the air flow of the air-cooling condenser; if the real-time pressure F is greater than the optimum pressure F0The maximum value of the error threshold value is used for controlling and reducing the water flow of the water-cooled heat exchanger or the air flow of the air-cooled condenser.
By adopting the technical scheme, the pressure acquisition module acquires the pressure of the refrigerant output frequency conversion compressor, and the third control module adjusts the water flow of the water-cooling heat exchanger and the air flow of the air-cooling condenser according to the pressure of the refrigerant, so that the running deviation running curve of the refrigerating system is reduced, and the condition that the running service life of a refrigerating part is reduced.
In summary, the invention includes at least one of the following beneficial technical effects:
1. and collecting the outdoor temperature, and adopting different operation modes for different outdoor temperatures. Namely, at high temperature, a water cooling operation mode is adopted, so that the condensation temperature of a refrigerant is reduced, the refrigeration efficiency is improved, and the shutdown risk of the VRV of the multi-split air conditioning unit is reduced; in low temperature, an air cooling operation mode is adopted, so that the operation deviation of a refrigeration system from the operation curve of the system is reduced, and the condition of reducing the operation service life of a refrigeration part is reduced;
2. the refrigerant is conveyed by different power mechanisms according to different outdoor temperatures, and the refrigerant pump is adopted to provide power for the circulation reciprocation of the refrigerant, so that energy can be saved, and natural refrigerants are fully utilized;
3. the pressure of the refrigerant output variable frequency compressor is collected, the water flow of the water-cooling heat exchanger and the air flow of the air-cooling condenser are adjusted according to the pressure of the refrigerant, the running deviation running curve of the refrigerating system is reduced, and the condition that the running service life of a refrigerating part is shortened is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
In the figure, 1, an inverter compressor; 2. an air-cooled condenser; 3. a water-cooled heat exchanger; 4. a water-cooled electromagnetic valve; 5. an air-cooled electromagnetic valve; 6. a temperature sensor; 7. a terminal end; 8. a refrigerant pump; 9. compressing the electromagnetic valve; 10. a pump solenoid valve; 11. a high pressure sensor; 12. an oil separator; 13. an outdoor fan; 14. an electronic expansion valve; 15. a gas-liquid separator; 16. a low pressure sensor; 17. an actuator; 18. a one-way valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows: a VRV device for a machine room comprises a variable frequency compressor 1, an air-cooled condenser 2, a water-cooled heat exchanger 3, a water-cooled electromagnetic valve 4, an air-cooled electromagnetic valve 5, a temperature sensor 6 and a plurality of tail ends 7, wherein the water-cooled electromagnetic valve 4 is arranged on a pipeline through which the variable frequency compressor 1 is communicated with the water-cooled heat exchanger 3; the air-cooled electromagnetic valve 5 is arranged on a pipeline communicated with the variable frequency compressor 1 and the air-cooled condenser 2; the refrigerant inlets of the plurality of tail ends 7 are respectively communicated with the outlets of the refrigerants in the water-cooling heat exchanger 3 and the air-cooling condenser 2 through pipelines, and the temperature sensor 6 is arranged outdoors and used for measuring the temperature of outdoor air. Wherein, end 7 is indoor air conditioner, and the quantity of end 7 can set up according to the demand, and end 7 has four in this embodiment, provides cold volume for computer lab or subway equipment room etc. through end 7.
The refrigerant outlets of the plurality of terminals 7 are respectively communicated with the refrigerant inlet of the inverter compressor 1 through pipelines, so that the refrigerant circulates among the refrigeration system, the terminals 7 and the inverter compressor 1. The temperature sensor 6 collects outdoor temperature and adopts different operation modes according to different outdoor temperatures. Namely, at high temperature, the water-cooling electromagnetic valve 4 is opened and the air-cooling electromagnetic valve 5 is closed, and the refrigerant is conveyed to the water-cooling heat exchanger 3 through the variable frequency compressor 1 for cooling; and at low temperature, closing the water-cooling electromagnetic valve 4 and opening the air-cooling electromagnetic valve 5, and conveying the refrigerant to the air-cooling condenser 2 for cooling through the variable frequency compressor 1. The input pipelines of the plurality of tail ends 7 are respectively provided with an electronic expansion valve 14, and the refrigeration quantity requirement of each tail end 7 is regulated and controlled through the electronic expansion valves 14.
The refrigerant pump 8, the compression electromagnetic valve 9 and the pump electromagnetic valve 10 are further included, and the compression electromagnetic valve 9 is arranged on a pipeline into which refrigerant enters in the variable frequency compressor 1; a pump solenoid valve 10 is provided in the pipe into which the refrigerant enters in the refrigerant pump 8. In this embodiment, the refrigerant inlet of the refrigerant pump 8 is respectively communicated with the refrigerant outlets of the plurality of terminals 7 through a pipeline, and the refrigerant outlet of the refrigerant pump 8 is respectively communicated with the refrigerant inlets of the water-cooled heat exchanger 3 and the air-cooled condenser 2 through pipelines. According to different outdoor temperatures, different power mechanisms are adopted to convey the refrigerant, namely a compression electromagnetic valve 9 is opened and a pump electromagnetic valve 10 is closed, and the refrigerant is conveyed to a water-cooling heat exchanger 3 or an air-cooling condenser 2 through a variable frequency compressor 1; the compression solenoid valve 9 is closed and the pump solenoid valve 10 is opened, and the refrigerant is delivered to the air-cooled condenser 2 by the refrigerant pump 8. The refrigerant pump 8 is adopted to provide power for the circulation reciprocation of the refrigerant, so that energy can be saved, and the natural refrigerant is fully utilized. In other embodiments, the refrigerant pump 8 may be disposed on a pipe connecting the refrigerant outlet of the air-cooled condenser 2 and the refrigerant inlet of the end 7.
The system also comprises a high-pressure sensor 11, wherein the high-pressure sensor 11 is arranged on an output pipeline of the refrigerant in the variable-frequency compressor 1 and is used for acquiring the real-time pressure of the refrigerant output from the variable-frequency compressor 1; the opening degree of an actuator 17 in the water-cooling heat exchanger 3 and the rotating speed of an outdoor fan 13 in the air-cooling condenser 2 are adjusted according to the pressure output by the refrigerant, so that the water flow of the water-cooling heat exchanger 3 and the air flow of the air-cooling condenser 2 are adjusted. The system also comprises a low-pressure sensor 16, wherein the low-pressure sensor 16 is arranged on an inlet pipeline of the refrigerant in the variable-frequency compressor 1 and is used for acquiring the real-time pressure of the refrigerant input into the variable-frequency compressor 1; the suction superheat degree of the inverter compressor 1 is controlled according to the pressure input by a refrigerant, and the suction superheat degree of the air conditioner, which is usually specific to a condenser, refers to a difference value between a saturation temperature corresponding to the pressure of the refrigerant at a certain point of an outlet of the condenser and an actual temperature of the refrigerant, wherein the saturation temperature corresponding to the pressure of the refrigerant and the actual temperature of the refrigerant are used as calculation methods in the prior art and are not elaborated herein in detail.
The system also comprises an oil separator 12 and a gas-liquid separator 15, wherein the oil separator 12 is arranged on an output pipeline of the refrigerant in the variable-frequency compressor 1, and the gas-liquid separator 15 is arranged on an inlet pipeline of the refrigerant in the variable-frequency compressor 1. The liquid part in the refrigerant is separated through the gas-liquid separator 15, if the liquid refrigerant enters the inverter compressor 1, the inverter compressor 1 is easily damaged, namely, the gas-liquid separator 15 and the low-pressure sensor 16 are used for carrying out double protection on the inverter compressor 1; the lubricating oil in the refrigerant is separated by the oil separator 12, and the lubricating oil consumed by the inverter compressor 1 is supplemented to a certain extent. The output pipelines of the refrigerant in the variable frequency compressor 1, the refrigerant pump 8, the air-cooled condenser 2 and the water-cooled heat exchanger 3 are all provided with check valves 18, and the backflow of the refrigerant can be prevented through the check valves 18.
The implementation principle of the above embodiment is as follows: when the temperature is high, the water cooling electromagnetic valve 4 and the compression electromagnetic valve 9 are opened, the air cooling electromagnetic valve 5 and the pump electromagnetic valve 10 are closed, the variable frequency compressor 1 is started, the refrigerant enters the water cooling heat exchanger 3 through the oil separator 12 to reduce the temperature, then enters the tail end 7 to provide cooling capacity for a machine room or a subway equipment room and the like, and finally returns to the variable frequency compressor 1 through the gas-liquid separator 15. When the temperature is low, the air cooling electromagnetic valve 5 and the compression electromagnetic valve 9 are opened, the water cooling electromagnetic valve 4 and the pump electromagnetic valve 10 are closed, the variable frequency compressor 1 is started, the refrigerant enters the air cooling condenser 2 through the oil separator 12 to reduce the temperature, then enters the tail end 7 to provide cooling capacity for a machine room or a subway equipment room and the like, and finally returns to the variable frequency compressor 1 through the gas-liquid separator 15. When the outdoor temperature is too low, the air cooling electromagnetic valve 5 and the pump electromagnetic valve 10 are opened, the water cooling electromagnetic valve 4 and the compression electromagnetic valve 9 are closed, the refrigerant pump 8 is started, the refrigerant enters the air cooling condenser 2 to reduce the temperature, then enters the tail end 7 to provide cooling capacity for a machine room or a subway equipment room and the like, and finally returns to the refrigerant pump 8.
Example two: a VRV control method for a multi-split air conditioner for a machine room comprises the steps of collecting outdoor temperature T, and judging the outdoor temperature T and a preset temperature threshold value T in real time1、T2In relation to (b), wherein T1﹥T2If T > T1If so, executing a first operation mode; if T ≧ T2And T is less than or equal to T1If so, executing a first operation mode or a second operation mode; if T < T2If so, executing a second operation mode; the first operation mode is to control the refrigerant to be conveyed into the water-cooling heat exchanger 3 for cooling, and the second operation mode is to control the refrigerant to be conveyed into the air-cooling condenser 2 for cooling.
For the judging process, in the embodiment, the judging process is not limited, and T > T may be judged first1If not, judging other conditions; or can judge T is more than or equal to T2And T is less than or equal to T1If not, judging other conditions; or judging T < T2If not, judging other conditions; the subsequent judgment process is the same. Wherein the preset temperature threshold value T1、T2It may be a set constant value or a value updated in real time, and in any case, it is a known value in the solution of the present invention, and how to obtain it is not within the scope of the discussion of the solution of the present invention. In this example T1Generally at 25 ℃, T2Typically 10 ℃ is taken.
And collecting the outdoor temperature, and adopting different operation modes for different outdoor temperatures. Namely, in high temperature, a water cooling operation mode is adopted, so that the condensation temperature of a cold source is reduced, the refrigeration efficiency is improved, and the shutdown risk of the VRV of the multi-split air conditioning system is reduced; and in low temperature, an air cooling operation mode is adopted, so that the operation deviation of the refrigeration system from the operation curve of the system is reduced, and the condition of reducing the operation service life of the refrigeration part is reduced. If T ≧ T2And T is less than or equal to T1And if so, maintaining the execution of the current operation mode. The first operation mode is executed when the outdoor temperature is collected last time; when the outdoor temperature T is collected again, T is more than or equal to T2And T is less than or equal to T1The first operation mode is executed. The second operation mode is executed when the outdoor temperature is collected last time; when the outdoor temperature T is collected again, T is more than or equal to T2And T is less than or equal to T1The second mode of operation is executed. The times of changing the VRV between the first operation mode and the second operation mode are reduced, and the condition of reducing the operation life of the refrigeration component is further reduced.
Real-time judgment of outdoor temperature T and preset temperature threshold T3In relation to (b), wherein T2﹥T3If T < T3When the cold source is in use, the refrigerant pump 8 is controlled to provide power for the transmission of the cold source; if T ≧ T3And when the cold source is in use, the variable frequency compressor 1 is controlled to provide power for the transmission of the cold source. Adopt different power unit to carry the cold source according to different outdoor temperatures, adopt refrigerant pump 8 to provide power to the circulation of cold source reciprocal, can the energy saving, make full use of nature cold source. Wherein the preset temperature threshold value T3The value may be a set constant value or a value updated in real time. In this example T3In general, a temperature of 0 ℃ to 5 ℃ may be employed.
Also comprises collecting the real-time pressure F of the cold source, and judging the real-time pressure F and the optimal pressure F in real time0If the real-time pressure F is at the optimum pressure F0Within the error threshold range, the current water flow of the water-cooled heat exchanger 3 or the air flow of the air-cooled condenser 2 is maintained; if the real-time pressure F is less than the optimum pressure F0The minimum value of the error threshold value is used for controlling and increasing the water flow of the water-cooling heat exchanger 3 or the air flow of the air-cooling condenser 2; if the real-time pressure F is greater than the optimum pressure F0The maximum value of the error threshold value of (3) is controlled to reduce the water flow of the water-cooled heat exchanger 3 or the air flow of the air-cooled condenser 2.
The pressure of the cold source output variable frequency compressor 1 is collected, the water flow of the water-cooling heat exchanger 3 and the air flow of the air-cooling condenser 2 are adjusted according to the cold source pressure, the running deviation running curve of the refrigerating system is reduced, the running service life of a refrigerating part is shortened, and the reduction of the running service life of the refrigerating part is reducedThe case (1). The error threshold range in this embodiment is greater than 0.9F0Less than 1.1F0(ii) a The error range may be set to be larger than 0.9F0Less than 1.1F0Or other ranges, may be set according to actual needs.
Example three: a VRV system for machine room comprises
The outdoor temperature acquisition module is used for acquiring outdoor temperature T;
a first control module for judging the outdoor temperature T and a preset temperature threshold value T1、T2In relation to (b), wherein T1﹥T2If T > T1If so, executing a first operation mode; if T ≧ T2And T is less than or equal to T1If so, executing a first operation mode or a second operation mode; if T < T2If so, executing a second operation mode; the first operation mode is to control the cold source to be conveyed into the water-cooling heat exchanger 3 for cooling, and the second operation mode is to control the cold source to be conveyed into the air-cooling condenser 2 for cooling.
The outdoor temperature acquisition module acquires outdoor temperature, and the first control module adopts different operation modes according to different outdoor temperatures. Namely, in high temperature, a water cooling operation mode is adopted, so that the condensation temperature of a cold source is reduced, the refrigeration efficiency is improved, and the shutdown risk of the VRV of the multi-split air conditioning system is reduced; and in low temperature, an air cooling operation mode is adopted, so that the operation deviation of the refrigeration system from the operation curve of the system is reduced, and the condition of reducing the operation service life of the refrigeration part is reduced.
The outdoor temperature T and a preset temperature threshold value T are judged by the second control module3In relation to (b), wherein T2﹥T3If T < T3When the cold source is in use, the refrigerant pump 8 is controlled to provide power for the transmission of the cold source; if T ≧ T3And when the cold source is in use, the variable frequency compressor 1 is controlled to provide power for the transmission of the cold source. The second control module adopts different power units to convey the cold source according to different outdoor temperatures, and adopts the refrigerant pump 8 to provide power for the circulation of the cold source, so that the energy can be saved, and the natural cold source can be fully utilized.
Also comprises a pressure acquisition module for acquiring coldThe actual pressure F of the variable frequency compressor 1 is sourced; a third control module for judging the real-time pressure F and the optimal pressure F0If the real-time pressure F is at the optimum pressure F0Within the error threshold range, the current water flow of the water-cooled heat exchanger 3 or the air flow of the air-cooled condenser 2 is maintained; if the real-time pressure F is less than the optimum pressure F0The minimum value of the error threshold value is used for controlling and increasing the water flow of the water-cooling heat exchanger 3 or the air flow of the air-cooling condenser 2; if the real-time pressure F is greater than the optimum pressure F0The maximum value of the error threshold value of (3) is controlled to reduce the water flow of the water-cooled heat exchanger 3 or the air flow of the air-cooled condenser 2. The pressure acquisition module acquires the pressure of the cold source output variable frequency compressor 1, and the third control module adjusts the water flow of the water-cooling heat exchanger 3 and the air flow of the air-cooling condenser 2 according to the pressure of the cold source, so that the running deviation running curve of the refrigerating system is reduced, and the condition that the running service life of a refrigerating part is reduced.
Example four: a computer storage medium storing a computer program capable of being loaded by a processor and executing the VRV control method for multiple online systems for computer rooms in the second embodiment is convenient to implement.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The utility model provides a computer lab is with many online VRV devices which characterized in that: the variable frequency compressor temperature control system comprises a variable frequency compressor (1), an air-cooled condenser (2), a water-cooled heat exchanger (3), a water-cooled electromagnetic valve (4), an air-cooled electromagnetic valve (5), a temperature sensor (6) and a plurality of tail ends (7), wherein the water-cooled electromagnetic valve (4) is arranged on a pipeline through which the variable frequency compressor (1) is communicated with the water-cooled heat exchanger (3); the air-cooled electromagnetic valve (5) is arranged on a pipeline communicated with the variable frequency compressor (1) and the air-cooled condenser (2); the tail ends (7) are respectively communicated with outlets of refrigerants in the water-cooling heat exchanger (3) and the air-cooling condenser (2) through pipelines, and the temperature sensor (6) is arranged outdoors and used for measuring the temperature of outdoor air.
2. The multi-split VRV device for the machine room as claimed in claim 1, wherein: the refrigerant pump (8), the compression electromagnetic valve (9) and the pump electromagnetic valve (10) are further included, and the compression electromagnetic valve (9) is arranged on a pipeline for the refrigerant to enter in the variable frequency compressor (1); the pump solenoid valve (10) is arranged on a pipeline for the refrigerant to enter in the refrigerant pump (8).
3. The multi-split VRV device for the machine room as claimed in claim 1, wherein: the device is characterized by further comprising a high-pressure sensor (11), wherein the high-pressure sensor (11) is arranged on an output pipeline of a refrigerant in the variable-frequency compressor (1) and used for collecting the real-time pressure of the refrigerant output from the variable-frequency compressor (1).
4. A VRV control method for a multi-split air conditioner for a machine room is characterized by comprising the following steps: comprises collecting outdoor temperature T, and real-time judging outdoor temperature T and preset temperature threshold T1、T2In relation to (b), wherein T1﹥T2If T > T1If so, executing a first operation mode; if T ≧ T2And T is less than or equal to T1If so, executing a first operation mode or a second operation mode; if T < T2If so, executing a second operation mode; the first operation mode is to control the refrigerant to be conveyed into the water-cooling heat exchanger (3) for cooling, and the second operation mode is to control the refrigerant to be conveyed into the air-cooling condenser (2) for cooling.
5. The VRV control method for the machine room according to claim 4, wherein: real-time judgment of outdoor temperature T and preset temperature threshold T3In relation to (b), wherein T2﹥T3If T < T3When the refrigerant is in use, the refrigerant pump (8) is controlled to provide power for conveying the refrigerant; if T ≧ T3And when the refrigerant is delivered, the inverter compressor (1) is controlled to provide power for the delivery of the refrigerant.
6. The VRV control method for the machine room according to claim 4, wherein: if T ≧ T2And T is less than or equal to T1And if so, maintaining the execution of the current operation mode.
7. The VRV control method for the machine room according to claim 4, wherein: also comprises collecting the real-time pressure F of the refrigerant, and judging the real-time pressure F and the optimal pressure F in real time0If the real-time pressure F is at the optimum pressure F0Within the error threshold range, maintaining the current water flow of the water-cooled heat exchanger (3) or the air flow of the air-cooled condenser (2); if the real-time pressure F is less than the optimum pressure F0The minimum value of the error threshold value is used for controlling the water flow of the water-cooling heat exchanger (3) or the air flow of the air-cooling condenser (2) to be increased; if the real-time pressure F is greater than the optimum pressure F0The maximum value of the error threshold value is used for controlling and reducing the water flow of the water-cooling heat exchanger (3) or the air flow of the air-cooling condenser (2).
8. The utility model provides a computer lab is with many online VRV system which characterized in that: comprises that
The outdoor temperature acquisition module is used for acquiring outdoor temperature T;
a first control module for judging the outdoor temperature T and a preset temperature threshold value T1、T2In relation to (b), wherein T1﹥T2If T > T1If so, executing a first operation mode; if T ≧ T2And T is less than or equal to T1If so, executing a first operation mode or a second operation mode; if T < T2If so, executing a second operation mode; the first operation mode is to control the refrigerant to be conveyed into the water-cooling heat exchanger (3) for cooling, and the second operation mode is to control the refrigerant to be conveyed into the air-cooling condenser (2) for cooling.
9. The multi-split VRV system for machine room of claim 8, wherein: also comprises
A second control module for judging the outdoor temperature T and the preset temperature threshold value T3In relation to (b), wherein T2﹥T3If T < T3When the refrigerant is in use, the refrigerant pump (8) is controlled to supply refrigerantConveying to provide power; if T ≧ T3And when the refrigerant is delivered, the inverter compressor (1) is controlled to provide power for the delivery of the refrigerant.
10. The multi-split VRV system for machine room of claim 8, wherein: also comprises
The pressure acquisition module is used for acquiring the actual pressure F of the refrigerant discharged from the variable frequency compressor (1);
a third control module for judging the real-time pressure F and the optimal pressure F0If the real-time pressure F is at the optimum pressure F0Within the error threshold range, maintaining the current water flow of the water-cooled heat exchanger (3) or the air flow of the air-cooled condenser (2); if the real-time pressure F is less than the optimum pressure F0The minimum value of the error threshold value is used for controlling the water flow of the water-cooling heat exchanger (3) or the air flow of the air-cooling condenser (2) to be increased; if the real-time pressure F is greater than the optimum pressure F0The maximum value of the error threshold value is used for controlling and reducing the water flow of the water-cooling heat exchanger (3) or the air flow of the air-cooling condenser (2).
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