CN110220258B - Air conditioning system, and operation control method and device of air conditioning system - Google Patents

Air conditioning system, and operation control method and device of air conditioning system Download PDF

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Publication number
CN110220258B
CN110220258B CN201810172014.XA CN201810172014A CN110220258B CN 110220258 B CN110220258 B CN 110220258B CN 201810172014 A CN201810172014 A CN 201810172014A CN 110220258 B CN110220258 B CN 110220258B
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valve
valve port
way valve
port
compressor
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CN110220258A (en
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李秀玲
刘畅
林华和
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Vertiv Tech Co Ltd
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Vertiv Tech Co Ltd
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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
    • 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
    • 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
    • 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
    • F24F11/85—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 variable-flow pumps
    • 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
    • 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
    • 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
    • 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
    • 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
    • F25B41/37—Capillary tubes
    • 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
    • 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
    • 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
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02732—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using two three-way valves

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioning system, and an operation control method and device of the air conditioning system, which are used for improving the annual energy efficiency ratio of the air conditioning system and reducing the energy consumption of the air conditioning system. The air conditioning system comprises a compressor, a condenser, a throttling element, an evaporation coil, a water pump, a natural cooling coil, a cooling tower, a first three-way valve and a second three-way valve, wherein the condenser is provided with a refrigerant passage and a water passage which are separated from each other, and the compressor, the refrigerant passage, the throttling element and the evaporation coil form a first loop; the cooling tower, the water pump and the water passage form a second loop; the cooling tower, the water pump and the natural cooling coil form a third loop; the first valve port of the first three-way valve is connected with the outlet of the water pump, the second valve port of the first three-way valve is respectively connected with the inlet of the water passage and the first valve port of the second three-way valve, the third valve port of the first three-way valve is connected with the outlet of the natural cooling coil, the second valve port of the second three-way valve is connected with the outlet of the water passage, and the third valve port of the second three-way valve is connected with the inlet of the cooling tower.

Description

Air conditioning system, and operation control method and device of air conditioning system
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to an air conditioning system and an operation control method and device of the air conditioning system.
Background
The rapid development of information industry and digital construction promotes the rapid increase of the number and construction scale of data rooms and communication base stations. According to statistics, the air conditioning energy consumption in the machine room and the base station accounts for about 40-50% of the total energy consumption, the sensible heat load of the machine room and the base station is large, and continuous refrigeration operation is needed all the year round. Therefore, how to improve the annual energy efficiency ratio of the air conditioner and reduce the energy consumption of the air conditioner is a technical problem to be solved urgently at present.
As shown in fig. 1, an existing air conditioning system includes: a compressor 010, a condenser 011, a liquid storage tank 012, a pump 013, an expansion valve 014 and an evaporator 015 which are connected in sequence and form a closed cycle through a refrigerant pipe, a first bypass valve 016 connected in parallel with the compressor 010, and a second bypass valve 017 connected in parallel with the pump 013. When the outdoor temperature is high, the first bypass valve 016 is closed, the second bypass valve 017 is opened, and the air conditioning system operates in a compressor mode; when the outdoor temperature is low, the first bypass valve 016 is opened, the second bypass valve 017 is closed, and the air conditioning system operates in a pump mode; when the outdoor temperature is in the transition season, the air conditioning system also needs to be operated in the compressor mode because the pump mode cannot meet the cooling demand.
The prior art has the defects that the running time of a pump mode all year round is short, and the improvement of the energy efficiency ratio all year round is not greatly contributed; the refrigerant flow of the pump and the compressor is also not adjustable, which is not beneficial to saving energy consumption of the system.
Disclosure of Invention
The embodiment of the invention aims to provide an air conditioning system, and an operation control method and device of the air conditioning system, so as to improve the annual energy efficiency ratio of the air conditioning system and reduce the energy consumption of the air conditioning system.
The air conditioning system provided by the embodiment of the invention comprises a compressor, a condenser, a throttling element, an evaporation coil, a water pump, a natural cooling coil, a cooling tower, a first three-way valve and a second three-way valve, wherein the condenser is provided with a refrigerant passage and a water passage which are separated from each other, and the compressor, the refrigerant passage, the throttling element and the evaporation coil are sequentially connected to form a first refrigeration cycle loop; the cooling tower, the water pump and the water passage are sequentially connected to form a second refrigeration circulation loop; the cooling tower, the water pump and the natural cooling coil are sequentially connected to form a third refrigeration cycle loop; the first three-way valve and the second three-way valve respectively comprise a first valve port, a second valve port and a third valve port, the first valve port of the first three-way valve is connected with an outlet of the water pump, the second valve port of the first three-way valve is connected with an inlet of the water passage and the first valve port of the second three-way valve respectively, the third valve port of the first three-way valve is connected with an outlet of the natural cooling coil pipe, the second valve port of the second three-way valve is connected with an outlet of the water passage, and the third valve port of the second three-way valve is connected with an inlet of the cooling tower.
According to the technical scheme of the embodiment of the invention, the refrigeration mode of the air conditioning system can be determined according to the indoor and outdoor temperature information, and the natural cold source is fully utilized, so that the output and the power consumption of the compressor are reduced, the annual energy efficiency ratio of the air conditioning system is further improved, and the energy consumption of the air conditioning system is reduced. Specifically, when the outdoor temperature is high or the indoor and outdoor temperature difference is small, the air conditioning system can operate in a compressor mode, the compressor, the throttling element, the water pump, the first valve port and the second valve port of the first three-way valve, the second valve port and the third valve port of the second three-way valve are opened, the third valve port of the first three-way valve and the first valve port of the second three-way valve are closed, the compressor drives the refrigerant to flow in the first refrigeration cycle loop, the refrigerant is condensed and exchanges heat between the refrigerant passage and cooling water in the water passage, and the refrigerant is evaporated and exchanged heat in the evaporation coil pipe, so that the indoor required cooling capacity is met; the water pump drives cooling water to flow in the second refrigeration cycle loop, the cooling water exchanges heat with the refrigerant in the refrigerant passage in the water passage and exchanges heat with outdoor air in the cooling tower; when the outdoor temperature is low or the indoor and outdoor temperature difference is large, the air conditioning system can operate in a natural cooling mode, the water pump, the second valve port and the third valve port of the first three-way valve, the first valve port and the third valve port of the second three-way valve are opened, the compressor, the throttling element, the first valve port of the first three-way valve and the second valve port of the second three-way valve are closed, at the moment, the water pump drives cooling water to flow in the third refrigeration cycle loop, the cooling water exchanges heat with outdoor air in the cooling tower and exchanges heat with indoor air in the natural cooling coil pipe, and therefore the indoor required cooling capacity is met; when the outdoor environment is in a transition season, the air conditioning system can operate in a mixed mode, the compressor, the throttling element, the water pump, the first valve port, the second valve port and the third valve port of the first three-way valve, and the first valve port, the second valve port and the third valve port of the second three-way valve are opened, and at the moment, the first refrigeration cycle loop, the second refrigeration cycle loop and the third refrigeration cycle loop work cooperatively to ensure indoor required cooling capacity.
Optionally, the number of the evaporation coils is at least two and the evaporation coils are arranged in parallel; and/or the number of the natural cooling coils is at least two and the natural cooling coils are arranged in parallel.
Optionally, the evaporating coil and the natural cooling coil are mutually independent; or the evaporating coil and the natural cooling coil are of an integrated composite structure.
Optionally, the number of compressors is at least two and arranged in parallel.
Optionally, the air conditioning system further includes a gas-liquid separator, and an inlet and an outlet of the gas-liquid separator are respectively communicated with the outlet of the evaporating coil and the inlet of the compressor.
Optionally, the refrigerant in the first refrigeration cycle includes R22, R410A, R407C, R744, R134a, R1234yf, R290, and R600 a.
Optionally, the first three-way valve and the second three-way valve are electric three-way valves; the air conditioning system also comprises a temperature detection device for detecting indoor and outdoor temperature information, and a controller which is respectively connected with the temperature monitoring device, the first three-way valve, the second three-way valve, the compressor, the throttling element and the water pump;
the controller is used for controlling the compressor, the throttling element, the water pump, the first valve port and the second valve port of the first three-way valve, the second valve port and the third valve port of the second three-way valve to be opened and controlling the third valve port of the first three-way valve and the first valve port of the second three-way valve to be closed when the outdoor temperature is higher than a set first temperature threshold value or the indoor-outdoor temperature difference is smaller than a set first temperature threshold value; and
when the outdoor temperature is not lower than the set second temperature threshold and not higher than the set first temperature threshold, or the indoor and outdoor temperature difference is not less than the set first temperature threshold and not greater than the set second temperature threshold, controlling the compressor, the throttling element, the water pump, the first valve port, the second valve port and the third valve port of the first three-way valve, the first valve port, the second valve port and the third valve port of the second three-way valve to be opened; and
when the outdoor temperature is lower than a set second temperature threshold or the indoor and outdoor temperature difference is greater than a set second temperature threshold, controlling the water pump, the second valve port and the third valve port of the first three-way valve, the first valve port and the third valve port of the second three-way valve to be opened, and controlling the compressor, the throttling element, the first valve port of the first three-way valve and the second valve port of the second three-way valve to be closed;
the first temperature threshold is larger than the second temperature threshold, and the first temperature difference threshold is smaller than the second temperature difference threshold.
By adopting the embodiment, the air conditioning system can automatically perform logic judgment according to indoor and outdoor temperature conditions so as to switch to a proper working mode, has higher intelligent degree, is particularly suitable for a large-scale multi-connected air conditioning system, further improves the annual energy efficiency ratio of the air conditioner, and reduces the energy consumption of the air conditioner.
Optionally, the air conditioning system further comprises an oil separator, and an electromagnetic valve and a capillary tube connected in series, wherein an air inlet of the oil separator is connected with an outlet of the compressor, an air outlet of the oil separator is connected with an inlet of the refrigerant passage, and an oil outlet of the oil separator is connected with an inlet of the compressor through the electromagnetic valve and the capillary tube connected in series; the controller is also connected with the electromagnetic valve and is used for:
in a first time period, controlling the electromagnetic valve to be closed;
in a second time period, controlling the electromagnetic valve to be opened and controlling the compressor to work at the first output rotating speed;
wherein the first time period and the second time period do not coincide.
By adopting the scheme of the embodiment, the air conditioning system works in the refrigeration mode in the first time period when the electromagnetic valve is closed, and the air conditioning system can be adjusted to any one of the compressor mode, the natural cooling mode or the mixed mode according to the indoor and outdoor temperature conditions; during the second time period when the electromagnetic valve is opened, the air conditioning system works in an oil return mode, lubricating oil mixed in the refrigerant can be deposited at the bottom of the oil separator and returns to the compressor through the capillary tube, so that the air conditioning system can return oil reliably, and the reliable operation of the compressor is ensured.
Based on the same inventive concept, the embodiment of the invention also provides an operation control method of the air conditioning system, which comprises the following steps:
acquiring current indoor and outdoor temperature information;
when the outdoor temperature is higher than a set first temperature threshold or the indoor and outdoor temperature difference is smaller than a set first temperature threshold, controlling the compressor, the throttling element, the water pump, the first valve port and the second valve port of the first three-way valve, the second valve port and the third valve port of the second three-way valve to be opened, and controlling the third valve port of the first three-way valve and the first valve port of the second three-way valve to be closed; and
when the outdoor temperature is not lower than the set second temperature threshold and not higher than the set first temperature threshold, or the indoor and outdoor temperature difference is not less than the set first temperature threshold and not greater than the set second temperature threshold, controlling the compressor, the throttling element, the water pump, the first valve port, the second valve port and the third valve port of the first three-way valve, the first valve port, the second valve port and the third valve port of the second three-way valve to be opened; and
when the outdoor temperature is lower than a set second temperature threshold or the indoor and outdoor temperature difference is greater than a set second temperature threshold, controlling the water pump, the second valve port and the third valve port of the first three-way valve, the first valve port and the third valve port of the second three-way valve to be opened, and controlling the compressor, the throttling element, the first valve port of the first three-way valve and the second valve port of the second three-way valve to be closed;
the first temperature threshold is larger than the second temperature threshold, and the first temperature difference threshold is smaller than the second temperature difference threshold.
The air conditioning system can automatically perform logic judgment according to indoor and outdoor temperature conditions so as to switch to a proper working mode by adopting the operation control method of the embodiment, has higher intelligent degree, is particularly suitable for a large multi-connected air conditioning system, and further improves the annual energy efficiency ratio of the air conditioner and reduces the energy consumption of the air conditioner.
Optionally, the air conditioning system further comprises an oil separator, and an electromagnetic valve and a capillary tube connected in series, wherein an air inlet of the oil separator is connected with an outlet of the compressor, an air outlet of the oil separator is connected with an inlet of the refrigerant passage, and an oil outlet of the oil separator is connected with an inlet of the compressor through the electromagnetic valve and the capillary tube connected in series; the method further comprises the following steps:
in a first time period, controlling the electromagnetic valve to be closed;
in a second time period, controlling the electromagnetic valve to be opened and controlling the compressor to work at the first output rotating speed;
wherein the first time period and the second time period do not coincide.
Based on the same inventive concept, an embodiment of the present invention further provides an operation control device of an air conditioning system, including:
the acquisition unit is used for acquiring current indoor and outdoor temperature information;
a control unit for
When the outdoor temperature is higher than a set first temperature threshold or the indoor and outdoor temperature difference is smaller than a set first temperature threshold, controlling the compressor, the throttling element, the water pump, the first valve port and the second valve port of the first three-way valve, the second valve port and the third valve port of the second three-way valve to be opened, and controlling the third valve port of the first three-way valve and the first valve port of the second three-way valve to be closed; and
when the outdoor temperature is not lower than the set second temperature threshold and not higher than the set first temperature threshold, or the indoor and outdoor temperature difference is not less than the set first temperature threshold and not greater than the set second temperature threshold, controlling the compressor, the throttling element, the water pump, the second valve port and the third valve port of the first three-way valve, the first valve port and the third valve port of the second three-way valve to be opened, and controlling the first valve port of the first three-way valve and the second valve port of the second three-way valve to be closed; and
when the outdoor temperature is lower than a set second temperature threshold or the indoor and outdoor temperature difference is greater than a set second temperature threshold, controlling the water pump, the second valve port and the third valve port of the first three-way valve, the first valve port and the third valve port of the second three-way valve to be opened, and controlling the compressor, the throttling element, the first valve port of the first three-way valve and the second valve port of the second three-way valve to be closed;
the first temperature threshold is larger than the second temperature threshold, and the first temperature difference threshold is smaller than the second temperature difference threshold.
Similarly, by adopting the operation control device of the embodiment, the logic judgment can be automatically carried out according to the indoor and outdoor temperature conditions so as to switch to a proper working mode, the intelligent degree is higher, and the operation control device is particularly suitable for a large multi-connected air conditioning system, so that the annual energy efficiency ratio of the air conditioner is further improved, and the energy consumption of the air conditioner is reduced.
Optionally, the air conditioning system further comprises an oil separator, and an electromagnetic valve and a capillary tube connected in series, wherein an air inlet of the oil separator is connected with an outlet of the compressor, an air outlet of the oil separator is connected with an inlet of the refrigerant passage, and an oil outlet of the oil separator is connected with an inlet of the compressor through the electromagnetic valve and the capillary tube connected in series; the control unit is further configured to:
in a first time period, controlling the electromagnetic valve to be closed;
in a second time period, controlling the electromagnetic valve to be opened and controlling the compressor to work at the first output rotating speed;
wherein the first time period and the second time period do not coincide.
Drawings
FIG. 1 is a schematic diagram of a prior art air conditioning system;
FIG. 2 is a schematic structural diagram of an air conditioning system according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an air conditioning system according to another embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating an operation control method of an air conditioning system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an operation control device of an air conditioning system according to an embodiment of the present invention.
Reference numerals:
the prior art comprises the following steps:
010-compressor 011-condenser 012-liquid storage tank 013-pump
014-expansion valve 015-evaporator 016-first bypass valve 017-second bypass valve
The embodiment part of the invention is as follows:
10-compressor 20-condenser 30-throttling element 40-evaporating coil
50-water pump 60-natural cooling coil pipe 70-cooling tower 80-first three-way valve
90-second three-way valve 81-first port of first three-way valve
82-second port 83 of the first three-way valve-third port of the first three-way valve
91-first port 92 of the second three-way valve-second port of the second three-way valve
93-third valve orifice 11 of second three-way valve-first electromagnetic valve 12-first capillary
110-gas-liquid separator 120-oil separator 130-solenoid valve
140-capillary 150-one-way valve 160-ball valve 170-filter
180-liquid-viewing mirror 100-acquisition unit 200-control unit
Detailed Description
In order to improve the annual energy efficiency ratio of the air conditioning system and reduce the energy consumption of the air conditioning system, the embodiment of the invention provides the air conditioning system, and an operation control method and device of the air conditioning system. In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by referring to the following examples.
As shown in fig. 2, an air conditioning system according to an embodiment of the present invention includes a compressor 10, a condenser 20, a throttling element 30, an evaporation coil 40, a water pump 50, a free cooling coil 60, a cooling tower 70, a first three-way valve 80, and a second three-way valve 90, wherein the condenser 20 has a refrigerant passage 21 and a water passage 22 which are separated from each other, and the compressor 10, the refrigerant passage 21, the throttling element 30, and the evaporation coil 40 are sequentially connected to form a first refrigeration cycle; the cooling tower 70, the water pump 50 and the water passage 22 are sequentially connected to form a second refrigeration cycle circuit; the cooling tower 70, the water pump 50 and the natural cooling coil 60 are sequentially connected to form a third refrigeration cycle loop; the first three-way valve 80 and the second three-way valve 90 respectively include a first port 81, a second port and a third port, the first port 81 of the first three-way valve is connected to the outlet of the water pump 50, the second port 82 of the first three-way valve is connected to the inlet of the water passage 22 and the first port 91 of the second three-way valve, the third port 83 of the first three-way valve is connected to the outlet of the natural cooling coil 60, the second port 92 of the second three-way valve is connected to the outlet of the water passage 22, and the third port 93 of the second three-way valve is connected to the inlet of the cooling tower 70.
In the technical scheme of the embodiment of the invention, the refrigeration mode of the air conditioning system can be determined according to the indoor and outdoor temperature information, and the natural cold source is fully utilized, so that the output and the power consumption of the compressor 10 are reduced, the annual energy efficiency ratio of the air conditioning system is further improved, and the energy consumption of the air conditioning system is reduced. Specifically, the method comprises the following steps:
when the outdoor temperature is high or the indoor and outdoor temperature difference is small, the air conditioning system can operate in a compressor mode, the compressor 10, the throttling element 30, the water pump 50, the first valve port 81 and the second valve port 82 of the first three-way valve, the second valve port 92 and the third valve port 93 of the second three-way valve are opened, the third valve port 83 of the first three-way valve and the first valve port 91 of the second three-way valve are closed, the compressor 10 drives the refrigerant to flow in the first refrigeration cycle loop, the refrigerant is subjected to condensation heat exchange between the refrigerant passage 21 and cooling water in the water passage 22, and is subjected to evaporation heat exchange in the evaporation coil 40, so that the indoor required cooling capacity is met; the water pump 50 drives the cooling water to flow in the second refrigeration cycle circuit, the cooling water exchanges heat with the refrigerant in the refrigerant passage 21 in the water passage 22, and exchanges heat with the outdoor air in the cooling tower 70;
when the outdoor temperature is low or the indoor and outdoor temperature difference is large, the air conditioning system can operate in a natural cooling mode, the water pump 50, the second valve port 82 and the third valve port 83 of the first three-way valve, the first valve port 91 and the third valve port 93 of the second three-way valve are opened, the compressor 10, the throttling element 30, the first valve port 81 of the first three-way valve and the second valve port 92 of the second three-way valve are closed, at the moment, the water pump 50 drives cooling water to flow in the third refrigeration cycle loop, the cooling water exchanges heat with outdoor air in the cooling tower 70 and exchanges heat with indoor air in the natural cooling coil 60, and therefore the indoor required cooling capacity is met;
when the outdoor environment is in the transition season, the air conditioning system can operate in the mixed mode, the compressor 10, the throttling element 30, the water pump 50, the first port 81, the second port 82 and the third port 83 of the first three-way valve, the first port 91, the second port 92 and the third port 93 of the second three-way valve are opened, and at the moment, the first refrigeration cycle loop, the second refrigeration cycle loop and the third refrigeration cycle loop work cooperatively to ensure the indoor required cooling capacity.
The specific type of the condenser 20 is not limited, and may be a plate condenser, a shell-and-tube condenser, or the like. As shown in fig. 3, it is known to those skilled in the art that the air conditioning system may further include the following components in addition to the above-mentioned key components: a one-way valve 150, a ball valve 160, a filter 170, a sight glass 180, and the like. The specific type of throttling element 30 is not limited and may be, for example, an electronic expansion valve or a thermal expansion valve, among others.
The specific number of the evaporating coil 40 and the natural cooling coil 60 is not limited, and can be determined according to the cooling capacity required to be provided by the air conditioning system. In the embodiment of the invention, at least two evaporation coils 40 are arranged in parallel, and at least two natural cooling coils 60 are arranged in parallel, so that the design of a large-scale multi-connected air conditioner can be matched, and the cooling capacity requirements of a machine room in different seasons can be fully met.
In the embodiment shown in fig. 2, an evaporation coil 40 and a natural cooling coil 60 are integrated into a composite structure, i.e. a composite evaporator is formed, and by adopting the composite structure, the number of pipes can be reduced, the occupied space can be reduced, and the structure of the air conditioning system is more compact.
It should be noted that, in other embodiments of the present invention, the evaporating coil 40 and the natural cooling coil 60 can be disposed independently, and are not limited in particular.
In the first refrigeration cycle, the number of the compressors 10 is not limited, and may be, for example, one, two or more, and may be specifically designed according to actual needs. As shown in fig. 2, when the number of compressors 10 is at least two, at least two compressors 10 are arranged in parallel. The specific type of the compressor 10 is not limited, and a variable capacity compressor or an inverter compressor is preferably employed. Alternative types of refrigerant in the first refrigeration cycle loop include R22, R410A, R407C, R744, R134a, R1234yf, R290, and R600 a. In addition, in the embodiment of the present invention, the compressor 10 may be a compressor 10 with an oil return function, and a pipeline is connected between an outlet and an inlet of the compressor 10, and the pipeline is provided with the first electromagnetic valve 11 and the first capillary tube 12, so that the lubricant oil mixed with the refrigerant discharged from the outlet of the compressor 10 can be returned to the compressor 10 through the first capillary tube 12, thereby enabling the compressor 10 to operate reliably.
As shown in fig. 3, the air conditioning system further includes a gas-liquid separator 110, and an inlet and an outlet of the gas-liquid separator 110 are respectively communicated with an outlet of the evaporating coil 40 and an inlet of the compressor 10. With this embodiment, in the first refrigeration cycle, the liquid refrigerant is evaporated and heat-exchanged in the evaporation coil 40 and then converted into a gas state, however, a part of liquid particles are inevitably mixed in the refrigerant in the gas state, and the gas-liquid separator 110 is arranged to separate the liquid particles from the gas refrigerant, so that the content of the liquid refrigerant entering the compressor 10 is reduced, and the energy efficiency of the compressor 10 can be improved.
The specific type of the first three-way valve 80 and the second three-way valve 90 is not limited, and a manual valve may be selected and operated by an operator according to the environmental conditions. In the embodiment of the present invention, the first three-way valve 80 and the second three-way valve 90 are both electric three-way valves, so that the different operation modes of the air conditioning system can be automatically switched by using the electric control performance of the electric three-way valves.
Specifically, the air conditioning system further includes a temperature detection device that detects indoor and outdoor temperature information, and a controller that is connected to the temperature detection device, the first three-way valve 80, the second three-way valve 90, the compressor 10, the throttling element 30, and the water pump 50, respectively;
a controller for controlling the compressor 10, the throttling element 30, the water pump 50, the first port 81 and the second port 82 of the first three-way valve, the second port 92 and the third port 93 of the second three-way valve to be opened, and controlling the third port 83 of the first three-way valve and the first port 91 of the second three-way valve to be closed when the outdoor temperature is higher than a set first temperature threshold value or the indoor-outdoor temperature difference is smaller than a set first temperature threshold value; and
when the outdoor temperature is not lower than the set second temperature threshold and not higher than the set first temperature threshold, or the indoor and outdoor temperature difference is not less than the set first temperature threshold and not greater than the set second temperature threshold, controlling the compressor 10, the throttling element 30, the water pump 50, the first port 81, the second port 82, and the third port 83 of the first three-way valve, the first port 91, the second port 92, and the third port 93 of the second three-way valve to be opened; and
when the outdoor temperature is lower than the set second temperature threshold or the indoor-outdoor temperature difference is greater than the set second temperature threshold, controlling the water pump 50, the second port 82 and the third port 83 of the first three-way valve, the first port 91 and the third port 93 of the second three-way valve to be opened, and controlling the compressor 10, the throttling element 30, the first port 81 of the first three-way valve, and the second port 92 of the second three-way valve to be closed;
the first temperature threshold is larger than the second temperature threshold, and the first temperature difference threshold is smaller than the second temperature difference threshold.
By adopting the embodiment, the air conditioning system can automatically perform logic judgment according to indoor and outdoor temperature conditions so as to switch to a proper working mode, has higher intelligent degree, is particularly suitable for a large-scale multi-connected air conditioning system, further improves the annual energy efficiency ratio of the air conditioner, and reduces the energy consumption of the air conditioner.
Taking the embodiment shown in fig. 3 as an example, the cycle process of the air conditioning system in different cooling operation modes is as follows:
when the outdoor temperature is high or the indoor and outdoor temperature difference is small, the air conditioning system operates in the compressor mode, the compressor 10, the throttling element 30, the water pump 50, the first port 81 and the second port 82 of the first three-way valve, the second port 92 and the third port 93 of the second three-way valve are opened, and the third port 83 of the first three-way valve and the first port 91 of the second three-way valve are closed. At this time, the refrigerant is compressed into high-temperature and high-pressure gas by the compressor 10, and then enters the refrigerant 21 passage of the condenser 20 through the check valve 150, the refrigerant exchanges heat with the cooling water in the water passage 22 in the refrigerant passage 21, is condensed to release heat to form low-temperature and high-pressure liquid, enters the throttling element 30 to be throttled to form low-temperature and low-pressure liquid, then enters the evaporation coil 40 to exchange heat with the indoor air by evaporation, and the evaporated gaseous refrigerant returns to the compressor 10 to complete a cycle. Meanwhile, the cooling water flowing out of the cooling tower 70 enters the water passage 22 of the condenser 20 by the driving of the water pump 50, exchanges heat with the refrigerant in the refrigerant passage 21 in the water passage 22 to become water with a high temperature, and then enters the cooling tower 70 through the second valve port 92 and the third valve port 93 of the second three-way valve to exchange heat with the outdoor air, thereby completing the primary cycle.
When the outdoor temperature is low or the difference between the indoor temperature and the outdoor temperature is large, the air conditioning system operates in the natural cooling mode, the water pump 50, the second port 82 and the third port 83 of the first three-way valve, the first port 91 and the third port 93 of the second three-way valve are opened, and the compressor 10, the throttling element 30, the first port 81 of the first three-way valve, and the second port 92 of the second three-way valve are closed. At this time, the cooling water flowing out of the cooling tower 70 enters the natural cooling coil 60 by the driving of the water pump 50, undergoes evaporation heat exchange with the indoor air to become water with a relatively high temperature, then sequentially passes through the third valve port 83 and the second valve port 82 of the first three-way valve, and the first valve port 91 and the third valve port 93 of the second three-way valve, and then enters the cooling tower 70 again to undergo heat exchange with the outdoor air, thereby completing one cycle.
When the outdoor environment is in a transition season, the air conditioning system is operated in the hybrid mode, and the compressor 10, the throttling element 30, the water pump 50, the first port 81, the second port 82, and the third port 83 of the first three-way valve, the first port 91, the second port 92, and the third port 93 of the second three-way valve are opened. At this time, the refrigerant is compressed into high-temperature and high-pressure gas by the compressor 10, and then enters the refrigerant passage 21 of the condenser 20 through the check valve 150, the refrigerant exchanges heat with the cooling water in the water passage 22 in the refrigerant passage 21, is condensed to release heat to form low-temperature and high-pressure liquid, enters the throttling element 30 to be throttled to form low-temperature and low-pressure liquid, then enters the evaporation coil 40 to exchange heat with the indoor air by evaporation, and the evaporated gaseous refrigerant returns to the compressor to complete a cycle. Meanwhile, a part of the cooling water flowing out of the cooling tower 70 enters the water passage 22 of the condenser 20 under the driving of the water pump 50, the cooling water exchanges heat with the refrigerant in the refrigerant passage 21 in the water passage 22 to become water with higher temperature, and then enters the cooling tower 70 through the second valve port 92 and the third valve port 93 of the second three-way valve to exchange heat with the outdoor air, so that the primary cycle is completed; the other part enters the natural cooling coil 60 to perform evaporation heat exchange with the indoor air to become water with higher temperature, and then enters the cooling tower 70 again after sequentially passing through the third valve port 83 and the second valve port 82 of the first three-way valve and the first valve port 91 and the third valve port 93 of the second three-way valve to perform heat exchange with the outdoor air, thereby completing one cycle.
In conclusion, the air conditioning system can determine the refrigeration mode of the air conditioning system according to the outdoor temperature information, and fully utilize the natural cold source, so that the output and the power consumption of the compressor 10 are reduced, the annual energy efficiency ratio of the air conditioner is further improved, and the energy consumption of the air conditioner is reduced.
As shown in fig. 3, optionally, the air conditioning system further includes an oil separator 120, and a solenoid valve 130 and a capillary tube 140 connected in series, wherein an air inlet of the oil separator 120 is connected to an outlet of the compressor 10, an air outlet of the oil separator 120 is connected to an inlet of the refrigerant passage 21, and an oil outlet of the oil separator 120 is connected to an inlet of the compressor 10 through the solenoid valve 130 and the capillary tube 140 connected in series; the controller is also connected to the solenoid valve 130 for:
during a first time period, the control solenoid 130 is closed;
in a second time period, controlling the solenoid valve 130 to open and controlling the compressor 10 to work at the first output rotation speed;
wherein the first time period and the second time period do not coincide.
The lubricant discharge amount of the compressor 10 is related to the rotational speed thereof. In the variable capacity or inverter compressor, the amount of refrigerant discharged differs depending on the number of revolutions, and therefore the amount of lubricating oil mixed in the refrigerant differs. The amount of oil passing through the capillary 140, i.e., the amount of oil returning from the air conditioning system, is related to the length of the capillary 140, and the longer the length of the capillary 140, the greater the resistance, and the less the amount of oil returning through the capillary 140; conversely, the shorter the length of the capillary tube 140, the less resistance and the greater the amount of oil that returns through the capillary tube 140. Therefore, by setting the appropriate rotation speed of the compressor 10 and the appropriate length of the capillary tube 140, the oil returning amount through the capillary tube 140 can be made to be equivalent to the content of the lubricating oil discharged from the compressor 10, thereby enabling the air conditioning system to return oil reliably. For example, in the embodiment of the present invention, when the compressor 10 is operated at the first output speed, the amount of the lubricant discharged from the compressor 10 is equivalent to the amount of the oil that can pass through the selected capillary tube 140, and thus reliable oil return of the air conditioning system can be ensured. It should be noted that the first output rotation speed of the compressor 10 is a certain rotation speed lower than the maximum rotation speed of the compressor 10, and the first output rotation speed of the compressor 10 is not determined by the indoor and outdoor temperature information, and is substantially a fixed value, and the fixed value is only related to the size of the capillary tube 140 used in the air conditioning system.
In addition, in the embodiment of the present invention, the first time period is substantially a time period when the air conditioning system operates in the cooling mode, and during the time period, the operation state of the air conditioning system may be adjusted according to the control logic in the foregoing embodiment; the second time period is substantially the time period when the air conditioning system operates in the oil return mode, and in the time period, the control logic is ignored, that is, the control logic no longer responds to any operating state parameter of the air conditioning system, and only the compressor 10 needs to be controlled to ensure that the air conditioning system can operate at the first output rotating speed for reliable oil return.
By adopting the scheme of the embodiment, in the first time period when the electromagnetic valve 130 is closed, the air conditioning system works in the refrigeration mode, and at the moment, the air conditioning system can be adjusted to any one of the compressor mode, the natural cooling mode or the mixed mode according to the indoor and outdoor temperature conditions; during the second time period when the solenoid valve is open, the air conditioning system operates in the oil return mode, and the lubricant oil mixed in the refrigerant can be deposited at the bottom of the oil separator 120 and return to the compressor 10 through the capillary tube 140, so that the air conditioning system can return oil reliably, and the reliable operation of the compressor 10 is ensured.
As shown in fig. 4, based on the same inventive concept, an embodiment of the present invention further provides an operation control method of an air conditioning system, including:
step 101, obtaining current indoor and outdoor temperature information;
step 102, judging whether the outdoor temperature is higher than a set first temperature threshold or whether the indoor and outdoor temperature difference is smaller than the set first temperature threshold; if yes, executing step 103, otherwise, executing step 104;
103, controlling the compressor, the throttling element, the water pump, the first valve port and the second valve port of the first three-way valve, the second valve port and the third valve port of the second three-way valve to be opened, and controlling the third valve port of the first three-way valve and the first valve port of the second three-way valve to be closed;
104, judging whether the outdoor temperature is not lower than a set second temperature threshold and not higher than a set first temperature threshold or whether the indoor and outdoor temperature difference is not less than the set first temperature threshold and not more than the set second temperature threshold; if yes, go to step 105, otherwise, go to step 106;
105, controlling the compressor, the throttling element, the water pump, the first valve port, the second valve port and the third valve port of the first three-way valve, and the first valve port, the second valve port and the third valve port of the second three-way valve to be opened;
step 106, judging whether the outdoor temperature is lower than a set second temperature threshold or whether the indoor and outdoor temperature difference is greater than the set second temperature threshold; if yes, go to step 107;
step 107, controlling the water pump, the second valve port and the third valve port of the first three-way valve, the first valve port and the third valve port of the second three-way valve to be opened, and controlling the compressor, the throttling element, the first valve port of the first three-way valve and the second valve port of the second three-way valve to be closed;
the first temperature threshold is larger than the second temperature threshold, and the first temperature difference threshold is smaller than the second temperature difference threshold.
The air conditioning system can automatically perform logic judgment according to indoor and outdoor temperature conditions so as to switch to a proper working mode by adopting the operation control method of the embodiment, has higher intelligent degree, is particularly suitable for a large multi-connected air conditioning system, and further improves the annual energy efficiency ratio of the air conditioner and reduces the energy consumption of the air conditioner.
It should be noted that the implementation sequence of the steps of the operation control method of the air conditioning system of the present invention is not limited to the method illustrated in fig. 4, and the steps can be flexibly adjusted according to the actual situation to meet the cooling requirement of the data center.
Optionally, the air conditioning system further comprises an oil separator, and an electromagnetic valve and a capillary tube connected in series, wherein an air inlet of the oil separator is connected with an outlet of the compressor, an air outlet of the oil separator is connected with an inlet of the refrigerant passage, and an oil outlet of the oil separator is connected with an inlet of the compressor through the electromagnetic valve and the capillary tube connected in series; the operation control method of the air conditioning system further includes:
in a first time period, controlling the electromagnetic valve to be closed;
in a second time period, controlling the electromagnetic valve to be opened and controlling the compressor to work at the first output rotating speed;
wherein the first time period and the second time period do not coincide.
As shown in fig. 5, based on the same inventive concept, an embodiment of the present invention further provides an operation control device of an air conditioning system, including:
an obtaining unit 100, configured to obtain current indoor and outdoor temperature information;
a control unit 200 for
When the outdoor temperature is higher than a set first temperature threshold or the indoor and outdoor temperature difference is smaller than a set first temperature threshold, controlling the compressor, the throttling element, the water pump, the first valve port and the second valve port of the first three-way valve, the second valve port and the third valve port of the second three-way valve to be opened, and controlling the third valve port of the first three-way valve and the first valve port of the second three-way valve to be closed; and
when the outdoor temperature is not lower than the set second temperature threshold and not higher than the set first temperature threshold, or the indoor and outdoor temperature difference is not less than the set first temperature threshold and not greater than the set second temperature threshold, controlling the compressor, the throttling element, the water pump, the second valve port and the third valve port of the first three-way valve, the first valve port and the third valve port of the second three-way valve to be opened, and controlling the first valve port of the first three-way valve and the second valve port of the second three-way valve to be closed; and
when the outdoor temperature is lower than a set second temperature threshold or the indoor and outdoor temperature difference is greater than a set second temperature threshold, controlling the water pump, the second valve port and the third valve port of the first three-way valve, the first valve port and the third valve port of the second three-way valve to be opened, and controlling the compressor, the throttling element, the first valve port of the first three-way valve and the second valve port of the second three-way valve to be closed;
the first temperature threshold is larger than the second temperature threshold, and the first temperature difference threshold is smaller than the second temperature difference threshold.
Similarly, by adopting the operation control device of the embodiment, the logic judgment can be automatically carried out according to the indoor and outdoor temperature conditions so as to switch to a proper working mode, the intelligent degree is higher, and the operation control device is particularly suitable for a large multi-connected air conditioning system, so that the annual energy efficiency ratio of the air conditioner is further improved, and the energy consumption of the air conditioner is reduced.
Optionally, the air conditioning system further comprises an oil separator, and an electromagnetic valve and a capillary tube connected in series, wherein an air inlet of the oil separator is connected with an outlet of the compressor, an air outlet of the oil separator is connected with an inlet of the refrigerant passage, and an oil outlet of the oil separator is connected with an inlet of the compressor through the electromagnetic valve and the capillary tube connected in series; the control unit is further configured to:
in a first time period, controlling the electromagnetic valve to be closed;
in a second time period, controlling the electromagnetic valve to be opened and controlling the compressor to work at the first output rotating speed;
wherein the first time period and the second time period do not coincide.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (8)

1. An air conditioning system is characterized by comprising a compressor, a condenser, a throttling element, an evaporation coil, a water pump, a natural cooling coil, a cooling tower, a first three-way valve and a second three-way valve, wherein the condenser is provided with a refrigerant passage and a water passage which are separated from each other, and the compressor, the refrigerant passage, the throttling element and the evaporation coil are sequentially connected to form a first refrigeration cycle loop; the cooling tower, the water pump and the water passage are sequentially connected to form a second refrigeration circulation loop; the cooling tower, the water pump and the natural cooling coil are sequentially connected to form a third refrigeration cycle loop; the first three-way valve and the second three-way valve respectively comprise a first valve port, a second valve port and a third valve port, the first valve port of the first three-way valve is connected with the outlet of the water pump, the second valve port of the first three-way valve is respectively connected with the inlet of the water passage and the first valve port of the second three-way valve, the third valve port of the first three-way valve is connected with the outlet of the natural cooling coil, the second valve port of the second three-way valve is connected with the outlet of the water passage, and the third valve port of the second three-way valve is connected with the inlet of the cooling tower;
the first three-way valve and the second three-way valve are electric three-way valves; the air conditioning system also comprises a temperature detection device for detecting indoor and outdoor temperature information, and a controller which is respectively connected with the temperature monitoring device, the first three-way valve, the second three-way valve, the compressor, the throttling element and the water pump;
the controller is used for controlling the compressor, the throttling element, the water pump, the first valve port and the second valve port of the first three-way valve, the second valve port and the third valve port of the second three-way valve to be opened and controlling the third valve port of the first three-way valve and the first valve port of the second three-way valve to be closed when the outdoor temperature is higher than a set first temperature threshold value or the indoor-outdoor temperature difference is smaller than a set first temperature threshold value; and
when the outdoor temperature is not lower than the set second temperature threshold and not higher than the set first temperature threshold, or the indoor and outdoor temperature difference is not less than the set first temperature threshold and not greater than the set second temperature threshold, controlling the compressor, the throttling element, the water pump, the first valve port, the second valve port and the third valve port of the first three-way valve, the first valve port, the second valve port and the third valve port of the second three-way valve to be opened; and
when the outdoor temperature is lower than a set second temperature threshold or the indoor and outdoor temperature difference is greater than a set second temperature threshold, controlling the water pump, the second valve port and the third valve port of the first three-way valve, the first valve port and the third valve port of the second three-way valve to be opened, and controlling the compressor, the throttling element, the first valve port of the first three-way valve and the second valve port of the second three-way valve to be closed;
the first temperature threshold is greater than the second temperature threshold, and the first temperature difference threshold is less than the second temperature difference threshold;
the air conditioning system also comprises an oil separator, an electromagnetic valve and a capillary tube which are connected in series, wherein the air inlet of the oil separator is connected with the outlet of the compressor, the air outlet of the oil separator is connected with the inlet of the refrigerant passage, and the oil outlet of the oil separator is connected with the inlet of the compressor through the electromagnetic valve and the capillary tube which are connected in series; the controller is also connected with the electromagnetic valve and is used for:
in a first time period, controlling the electromagnetic valve to be closed;
in a second time period, controlling the electromagnetic valve to be opened and controlling the compressor to work at the first output rotating speed;
the first time period is the time period when the air conditioning system works in the refrigeration mode, the second time period is the time period when the air conditioning system works in the oil return mode, and the first time period and the second time period are not overlapped.
2. The air conditioning system as claimed in claim 1, wherein the number of the evaporating coils is at least two and arranged in parallel; and/or the number of the natural cooling coils is at least two and the natural cooling coils are arranged in parallel.
3. The air conditioning system of claim 1, wherein the evaporator coil is independent of the free cooling coil; or the evaporating coil and the natural cooling coil are of an integrated composite structure.
4. The air conditioning system as claimed in claim 1, wherein the number of compressors is at least two and the compressors are arranged in parallel.
5. The air conditioning system as claimed in claim 1, further comprising a gas-liquid separator, an inlet and an outlet of the gas-liquid separator being in communication with the outlet of the evaporating coil and the inlet of the compressor, respectively.
6. The air conditioning system as claimed in claim 1, wherein the refrigerant in the first refrigeration cycle circuit includes R22, R410A, R407C, R744, R134a, R1234yf, R290, and R600 a.
7. The operation control method of the air conditioning system is characterized in that the air conditioning system comprises a compressor, a condenser, a throttling element, an evaporation coil, a water pump, a natural cooling coil, a cooling tower, a first three-way valve and a second three-way valve, wherein the condenser is provided with a refrigerant passage and a water passage which are separated from each other, and the compressor, the refrigerant passage, the throttling element and the evaporation coil are sequentially connected to form a first refrigeration cycle loop; the cooling tower, the water pump and the water passage are sequentially connected to form a second refrigeration circulation loop; the cooling tower, the water pump and the natural cooling coil are sequentially connected to form a third refrigeration cycle loop; the first three-way valve and the second three-way valve respectively comprise a first valve port, a second valve port and a third valve port, the first valve port of the first three-way valve is connected with the outlet of the water pump, the second valve port of the first three-way valve is respectively connected with the inlet of the water passage and the first valve port of the second three-way valve, the third valve port of the first three-way valve is connected with the outlet of the natural cooling coil, the second valve port of the second three-way valve is connected with the outlet of the water passage, and the third valve port of the second three-way valve is connected with the inlet of the cooling tower; an operation control method of an air conditioning system; the method comprises the following steps:
acquiring current indoor and outdoor temperature information;
when the outdoor temperature is higher than a set first temperature threshold or the indoor and outdoor temperature difference is smaller than a set first temperature threshold, controlling the compressor, the throttling element, the water pump, the first valve port and the second valve port of the first three-way valve, the second valve port and the third valve port of the second three-way valve to be opened, and controlling the third valve port of the first three-way valve and the first valve port of the second three-way valve to be closed; and
when the outdoor temperature is not lower than the set second temperature threshold and not higher than the set first temperature threshold, or the indoor and outdoor temperature difference is not less than the set first temperature threshold and not greater than the set second temperature threshold, controlling the compressor, the throttling element, the water pump, the first valve port, the second valve port and the third valve port of the first three-way valve, the first valve port, the second valve port and the third valve port of the second three-way valve to be opened; and
when the outdoor temperature is lower than a set second temperature threshold or the indoor and outdoor temperature difference is greater than a set second temperature threshold, controlling the water pump, the second valve port and the third valve port of the first three-way valve, the first valve port and the third valve port of the second three-way valve to be opened, and controlling the compressor, the throttling element, the first valve port of the first three-way valve and the second valve port of the second three-way valve to be closed;
the first temperature threshold is greater than the second temperature threshold, and the first temperature difference threshold is less than the second temperature difference threshold;
the air conditioning system also comprises an oil separator, an electromagnetic valve and a capillary tube which are connected in series, wherein the air inlet of the oil separator is connected with the outlet of the compressor, the air outlet of the oil separator is connected with the inlet of the refrigerant passage, and the oil outlet of the oil separator is connected with the inlet of the compressor through the electromagnetic valve and the capillary tube which are connected in series; the method further comprises the following steps:
in a first time period, controlling the electromagnetic valve to be closed;
in a second time period, controlling the electromagnetic valve to be opened and controlling the compressor to work at the first output rotating speed;
the first time period is the time period when the air conditioning system works in the refrigeration mode, the second time period is the time period when the air conditioning system works in the oil return mode, and the first time period and the second time period are not overlapped.
8. The operation control device of the air conditioning system is characterized in that the air conditioning system comprises a compressor, a condenser, a throttling element, an evaporation coil, a water pump, a natural cooling coil, a cooling tower, a first three-way valve and a second three-way valve, wherein the condenser is provided with a refrigerant passage and a water passage which are separated from each other, and the compressor, the refrigerant passage, the throttling element and the evaporation coil are sequentially connected to form a first refrigeration cycle loop; the cooling tower, the water pump and the water passage are sequentially connected to form a second refrigeration circulation loop; the cooling tower, the water pump and the natural cooling coil are sequentially connected to form a third refrigeration cycle loop; the first three-way valve and the second three-way valve respectively comprise a first valve port, a second valve port and a third valve port, the first valve port of the first three-way valve is connected with the outlet of the water pump, the second valve port of the first three-way valve is respectively connected with the inlet of the water passage and the first valve port of the second three-way valve, the third valve port of the first three-way valve is connected with the outlet of the natural cooling coil, the second valve port of the second three-way valve is connected with the outlet of the water passage, and the third valve port of the second three-way valve is connected with the inlet of the cooling tower; an operation control device of an air conditioning system; the method comprises the following steps:
the acquisition unit is used for acquiring current indoor and outdoor temperature information;
a control unit for
When the outdoor temperature is higher than a set first temperature threshold or the indoor and outdoor temperature difference is smaller than a set first temperature threshold, controlling the compressor, the throttling element, the water pump, the first valve port and the second valve port of the first three-way valve, the second valve port and the third valve port of the second three-way valve to be opened, and controlling the third valve port of the first three-way valve and the first valve port of the second three-way valve to be closed; and
when the outdoor temperature is not lower than the set second temperature threshold and not higher than the set first temperature threshold, or the indoor and outdoor temperature difference is not less than the set first temperature threshold and not greater than the set second temperature threshold, controlling the compressor, the throttling element, the water pump, the first valve port, the second valve port and the third valve port of the first three-way valve, the first valve port, the second valve port and the third valve port of the second three-way valve to be opened; and
when the outdoor temperature is lower than a set second temperature threshold or the indoor and outdoor temperature difference is greater than a set second temperature threshold, controlling the water pump, the second valve port and the third valve port of the first three-way valve, the first valve port and the third valve port of the second three-way valve to be opened, and controlling the compressor, the throttling element, the first valve port of the first three-way valve and the second valve port of the second three-way valve to be closed;
the first temperature threshold is greater than the second temperature threshold, and the first temperature difference threshold is less than the second temperature difference threshold;
the air conditioning system also comprises an oil separator, an electromagnetic valve and a capillary tube which are connected in series, wherein the air inlet of the oil separator is connected with the outlet of the compressor, the air outlet of the oil separator is connected with the inlet of the refrigerant passage, and the oil outlet of the oil separator is connected with the inlet of the compressor through the electromagnetic valve and the capillary tube which are connected in series; the control unit is further configured to:
in a first time period, controlling the electromagnetic valve to be closed;
in a second time period, controlling the electromagnetic valve to be opened and controlling the compressor to work at the first output rotating speed;
the first time period is the time period when the air conditioning system works in the refrigeration mode, the second time period is the time period when the air conditioning system works in the oil return mode, and the first time period and the second time period are not overlapped.
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