[go: up one dir, main page]

CN111271831B - 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

Info

Publication number
CN111271831B
CN111271831B CN201811478360.7A CN201811478360A CN111271831B CN 111271831 B CN111271831 B CN 111271831B CN 201811478360 A CN201811478360 A CN 201811478360A CN 111271831 B CN111271831 B CN 111271831B
Authority
CN
China
Prior art keywords
refrigeration system
refrigeration
liquid pump
temperature
preset
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201811478360.7A
Other languages
Chinese (zh)
Other versions
CN111271831A (en
Inventor
李大红
万积清
位静
郭振江
马亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vertiv Tech Co Ltd
Original Assignee
Vertiv Tech Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vertiv Tech Co Ltd filed Critical Vertiv Tech Co Ltd
Priority to CN201811478360.7A priority Critical patent/CN111271831B/en
Publication of CN111271831A publication Critical patent/CN111271831A/en
Application granted granted Critical
Publication of CN111271831B publication Critical patent/CN111271831B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (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 aim to improve the working reliability of the air conditioning system. When the outdoor environment temperature is not higher than the preset temperature, firstly controlling the first refrigerating system to enter a liquid pump refrigerating mode, and simultaneously controlling the second refrigerating system to continuously run in a compressor refrigerating mode, so that the air conditioning system can keep certain refrigerating output in a time period established by the flow rate of a liquid pump of the first refrigerating system; when the liquid pump of the first refrigerating system runs at a preset lift and realizes stable refrigerating output, the second refrigerating system is controlled to enter a liquid pump refrigerating mode, and meanwhile, the liquid pump of the first refrigerating system is adjusted to run at a first target lift under the liquid pump refrigerating mode, so that the air-conditioning system is smoothly switched from the double-compressor refrigerating mode to the double-pump refrigerating mode.

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 growth of the number and construction scale of data centers and communication base stations. According to statistics, the air conditioning energy consumption in the machine room and the base station accounts for 38% -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. Aiming at the characteristic that an air conditioning system operates all year round, refrigeration by fully utilizing a natural cold source in outdoor low-temperature seasons becomes an energy-saving scheme commonly adopted in the industry.
As shown in fig. 1, a conventional air conditioning system includes a first refrigeration system 01 and a second refrigeration system 02, each of which includes a compressor 03, a condenser 04, a liquid pump 05, a throttling element 06, and an evaporator 07, which are sequentially connected by pipes and form a closed cycle, and a first bypass valve 08 connected in parallel with the compressor 03 and a second bypass valve 09 connected in parallel with the liquid pump 05, and when the compressor 03 and the second bypass valve 09 are turned on and the liquid pump 05 and the first bypass valve 08 are turned off, the refrigeration systems operate in a compressor cooling mode; when the compressor 03 and the second bypass valve 09 are closed and the liquid pump 05 and the first bypass valve 08 are opened, the refrigeration system operates in a liquid pump refrigeration mode, so that the air conditioning system can be adjusted to specifically operate in a dual-compressor refrigeration mode, a dual-liquid-pump refrigeration mode or a single-compressor and single-liquid-pump refrigeration mode according to the outdoor environment temperature, and the refrigeration requirement in the machine room is met.
The prior art has the defects that when the air conditioning system is switched from the double-compressor refrigeration mode to the double-liquid pump refrigeration mode, the liquid pump flow is slowly established, so that refrigeration cannot be carried out within a certain time when the air conditioning system is switched to the double-liquid pump refrigeration mode, and certain risks exist in occasions with higher requirements on temperature control.
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 working reliability of the air conditioning system.
The air conditioning system provided by the embodiment of the invention comprises a first refrigeration system and a second refrigeration system, wherein each refrigeration system comprises a compressor, a condenser, a liquid pump, a throttling element and an evaporator which are sequentially connected through pipelines and form closed circulation, a first bypass valve connected with the compressor in parallel and a second bypass valve connected with the liquid pump in parallel; further comprising:
the temperature detection module is used for detecting the outdoor environment temperature;
the controller is respectively connected with the compressor, the liquid pump, the first bypass valve and the second bypass valve of each refrigerating system and is used for:
acquiring the outdoor environment temperature;
when the outdoor environment temperature is higher than a first preset temperature, respectively controlling the opening of a compressor and a second bypass valve of the first refrigeration system and the second refrigeration system, and respectively controlling the closing of a liquid pump and a first bypass valve of the first refrigeration system and the second refrigeration system, so that the first refrigeration system and the second refrigeration system operate in a compressor refrigeration mode;
when the outdoor environment temperature is not higher than the first preset temperature and is higher than the second preset temperature, controlling a compressor and a second bypass valve of the first refrigeration system to be closed, and controlling a liquid pump and a first bypass valve of the first refrigeration system to be opened, so that the first refrigeration system is switched to operate in a liquid pump refrigeration mode, the second refrigeration system is controlled to continue to operate in a compressor refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to be a preset lift; when the liquid pump of the first refrigeration system runs at a preset lift, controlling a compressor and a second bypass valve of the second refrigeration system to be closed and controlling the liquid pump and a first bypass valve of the second refrigeration system to be opened, so that the second refrigeration system is switched to run in a liquid pump refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to a first target lift; wherein the first target lift is not less than a preset lift;
when the outdoor environment temperature is not higher than the second preset temperature, respectively controlling the compressors and the second bypass valves of the first refrigeration system and the second refrigeration system to be closed, and respectively controlling the liquid pumps and the first bypass valves of the first refrigeration system and the second refrigeration system to be opened, so that the first refrigeration system and the second refrigeration system are operated in a liquid pump refrigeration mode; wherein the second preset temperature is lower than the first preset temperature.
In a specific embodiment, when the outdoor ambient temperature is not greater than the first preset temperature and greater than the second preset temperature, after controlling the second refrigeration system to operate in the liquid pump refrigeration mode, the controller is further configured to:
the head of the liquid pump of the second refrigeration system is adjusted to a second target head.
In a specific embodiment, the controller is further connected with an outdoor fan arranged at a condenser of each refrigeration system; when the outdoor environment temperature is not greater than the first preset temperature and is greater than the second preset temperature, after the liquid pump of the first refrigeration system operates at the preset lift, and before the lift of the liquid pump of the first refrigeration system is adjusted to the first target lift, the controller is further configured to:
and determining a first fan rotating speed corresponding to the preset first condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the first refrigeration system to operate at the first fan rotating speed.
In a specific embodiment, the controller is further connected with an outdoor fan arranged at a condenser of each refrigeration system; when the outdoor environment temperature is not greater than the first preset temperature and greater than the second preset temperature, before the first refrigeration system is switched to operate in the liquid pump refrigeration mode, the controller is further configured to:
and determining the rotating speed of a second fan corresponding to the preset second condensation pressure according to the corresponding relation between the condensation pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the first refrigeration system to operate at the rotating speed of the second fan.
In a specific embodiment, the controller is further connected with an outdoor fan arranged at a condenser of each refrigeration system; when the outdoor environment temperature is not greater than the first preset temperature and greater than the second preset temperature, after the liquid pump of the first refrigeration system operates at the preset lift, and before the second refrigeration system switches to operate in a liquid pump refrigeration mode, the controller is further configured to:
and determining the rotating speed of a third fan corresponding to the preset third condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the second refrigeration system to operate at the rotating speed of the third fan.
In a specific embodiment, the temperature detection module is also used for detecting the return air temperature in the room; when the outdoor environment temperature is not greater than the first preset temperature and greater than the second preset temperature, after the first refrigeration system is switched to operate in the liquid pump refrigeration mode and before the second refrigeration system is switched to operate in the liquid pump refrigeration mode, the controller is further configured to:
acquiring a first indoor return air temperature;
and determining a first refrigerating requirement of the second refrigerating system according to the first indoor return air temperature, determining a first output rotating speed of a compressor of the second refrigerating system according to the first refrigerating requirement, and controlling the compressor of the second refrigerating system to operate at the first output rotating speed.
In a specific embodiment, the temperature detection module is also used for detecting the indoor return air temperature; when the outdoor environment temperature is not greater than the first preset temperature and greater than the second preset temperature, after the first refrigeration system is switched to operate in the liquid pump refrigeration mode and before the second refrigeration system is switched to operate in the liquid pump refrigeration mode, the controller is further configured to:
acquiring a second indoor return air temperature;
determining the total refrigeration requirement of the air conditioning system according to the second indoor return air temperature, determining the second output rotating speed of the compressor of the second refrigeration system according to the total refrigeration requirement, and controlling the compressor of the second refrigeration system to operate at the second output rotating speed;
when the compressor of the second refrigeration system operates at the second output rotating speed for a preset time, acquiring the return air temperature in the third chamber;
and determining a second refrigeration requirement of the second refrigeration system according to the return air temperature in the third chamber, determining a third output rotating speed of a compressor of the second refrigeration system according to the second refrigeration requirement, and controlling the compressor of the second refrigeration system to operate in a liquid pump refrigeration mode when the second refrigeration system operates at the third output rotating speed.
In the embodiment of the invention, when the outdoor environment temperature is higher than the first preset temperature, the air conditioning system operates in a double-compressor refrigeration mode; when the outdoor environment temperature is not higher than the first preset temperature and is higher than the second preset temperature, the air-conditioning system needs to be switched from a double-compressor refrigeration mode to a double-liquid-pump refrigeration mode, at the moment, the first refrigeration system is controlled to enter a liquid pump refrigeration mode, and meanwhile, the second refrigeration system is controlled to continue to operate in the compressor refrigeration mode, so that the air-conditioning system can keep certain refrigeration output within a time period established by the flow rate of a liquid pump of the first refrigeration system; when a liquid pump of the first refrigeration system runs at a preset lift and realizes stable refrigeration output, the second refrigeration system is controlled to enter a liquid pump refrigeration mode, and the liquid pump of the first refrigeration system is adjusted to run at a first target lift under the liquid pump refrigeration mode, so that the air-conditioning system is smoothly switched from the dual-compressor refrigeration mode to the dual-liquid pump refrigeration mode; and when the outdoor environment temperature is not more than the second preset temperature, the air conditioning system can be directly controlled to operate in a double-liquid-pump refrigeration mode. Compared with the prior art, the air conditioning system of the scheme can always keep certain refrigeration output in the switching process of the refrigeration mode, so that the working reliability of the air conditioning system is improved.
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 the outdoor environment temperature;
when the outdoor environment temperature is higher than a first preset temperature, respectively controlling the opening of a compressor and a second bypass valve of the first refrigeration system and the second refrigeration system, and respectively controlling the closing of a liquid pump and a first bypass valve of the first refrigeration system and the second refrigeration system, so that the first refrigeration system and the second refrigeration system operate in a compressor refrigeration mode;
when the outdoor environment temperature is not higher than the first preset temperature and is higher than the second preset temperature, controlling a compressor and a second bypass valve of the first refrigeration system to be closed, and controlling a liquid pump and a first bypass valve of the first refrigeration system to be opened, so that the first refrigeration system is switched to operate in a liquid pump refrigeration mode, the second refrigeration system is controlled to continue to operate in a compressor refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to be a preset lift; when the liquid pump of the first refrigeration system runs at a preset lift, controlling a compressor and a second bypass valve of the second refrigeration system to be closed and controlling the liquid pump and a first bypass valve of the second refrigeration system to be opened, so that the second refrigeration system is switched to run in a liquid pump refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to a first target lift; wherein the first target lift is not less than a preset lift;
when the outdoor environment temperature is not higher than the second preset temperature, respectively controlling the compressors and the second bypass valves of the first refrigeration system and the second refrigeration system to be closed, and respectively controlling the liquid pumps and the first bypass valves of the first refrigeration system and the second refrigeration system to be opened, so that the first refrigeration system and the second refrigeration system are operated in a liquid pump refrigeration mode; wherein the second preset temperature is lower than the first preset temperature.
By adopting the operation control method of the air conditioning system provided by the embodiment of the invention, the air conditioning system can always keep certain refrigeration output in the switching process of the refrigeration mode, thereby improving the working reliability of the air conditioning system.
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 acquisition unit for acquiring an outdoor ambient temperature;
a control unit for:
when the outdoor environment temperature is higher than a first preset temperature, respectively controlling the opening of a compressor and a second bypass valve of the first refrigeration system and the second refrigeration system, and respectively controlling the closing of a liquid pump and a first bypass valve of the first refrigeration system and the second refrigeration system, so that the first refrigeration system and the second refrigeration system operate in a compressor refrigeration mode;
when the outdoor environment temperature is not higher than the first preset temperature and is higher than the second preset temperature, controlling a compressor and a second bypass valve of the first refrigeration system to be closed, and controlling a liquid pump and a first bypass valve of the first refrigeration system to be opened, so that the first refrigeration system is switched to operate in a liquid pump refrigeration mode, the second refrigeration system is controlled to continue to operate in a compressor refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to be a preset lift; when the liquid pump of the first refrigeration system runs at a preset lift, controlling a compressor and a second bypass valve of the second refrigeration system to be closed and controlling the liquid pump and a first bypass valve of the second refrigeration system to be opened, so that the second refrigeration system is switched to run in a liquid pump refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to a first target lift; wherein the first target lift is not less than a preset lift;
when the outdoor environment temperature is not higher than the second preset temperature, respectively controlling the compressors and the second bypass valves of the first refrigeration system and the second refrigeration system to be closed, and respectively controlling the liquid pumps and the first bypass valves of the first refrigeration system and the second refrigeration system to be opened, so that the first refrigeration system and the second refrigeration system are operated in a liquid pump refrigeration mode; wherein the second preset temperature is lower than the first preset temperature.
By adopting the operation control device of the air conditioning system provided by the embodiment of the invention, the air conditioning system can always keep certain refrigeration output in the switching process of the refrigeration mode, so that the working reliability of the air conditioning system is improved.
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 flow chart illustrating an operation control method of an air conditioning system according to an embodiment of the present invention;
fig. 4 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:
01-first refrigeration system 02-second refrigeration system
03-compressor 04-condenser 05-liquid pump 06-throttling element 07-evaporator
08-first bypass valve 09-second bypass valve
The embodiment part of the invention is as follows:
10-first refrigeration system 20-second refrigeration system 30-controller
11-compressor 12-condenser 13-liquid pump 14-throttling element 15-evaporator
16-first bypass valve 17-second bypass valve 18-outdoor fan
100-acquisition unit 200-control unit
Detailed Description
In order to improve the working reliability 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 first refrigeration system 10 and a second refrigeration system 20, each of which includes a compressor 11, a condenser 12, a liquid pump 13, a throttling element 14, and an evaporator 15, which are sequentially connected by piping and form a closed cycle, and a first bypass valve 16 connected in parallel to the compressor 11, and a second bypass valve 17 connected in parallel to the liquid pump 13; further comprising:
the temperature detection module is used for detecting the outdoor environment temperature;
a controller 30, connected to the compressor 11, the liquid pump 13, the first bypass valve 16 and the second bypass valve 17 of each refrigeration system, respectively, for:
acquiring the outdoor environment temperature;
when the outdoor environment temperature is higher than a first preset temperature, respectively controlling the opening of the compressor 11 and the second bypass valve 17 of the first refrigeration system 10 and the second refrigeration system 20, and respectively controlling the closing of the liquid pump 13 and the first bypass valve 16 of the first refrigeration system 10 and the second refrigeration system 20, so that the first refrigeration system 10 and the second refrigeration system 20 operate in a compressor refrigeration mode;
when the outdoor environment temperature is not higher than the first preset temperature and is higher than the second preset temperature, controlling the compressor 11 and the second bypass valve 17 of the first refrigeration system 10 to be closed, and controlling the liquid pump 13 and the first bypass valve 16 of the first refrigeration system 10 to be opened, so that the first refrigeration system 10 is switched to operate in a liquid pump refrigeration mode, controlling the second refrigeration system 20 to continue to operate in the compressor refrigeration mode, and adjusting the lift of the liquid pump 13 of the first refrigeration system 10 to be a preset lift; when the liquid pump 13 of the first refrigeration system 10 operates at a preset lift, controlling the compressor 11 and the second bypass valve 17 of the second refrigeration system 20 to be closed, and controlling the liquid pump 13 and the first bypass valve 16 of the second refrigeration system 20 to be opened, so that the second refrigeration system 20 is switched to operate in a liquid pump refrigeration mode, and the lift of the liquid pump 13 of the first refrigeration system 10 is adjusted to a first target lift; wherein the preset lift is not greater than the first target lift;
when the outdoor environment temperature is not higher than the second preset temperature, respectively controlling the compressors 11 and the second bypass valves 17 of the first refrigeration system 10 and the second refrigeration system 20 to be closed, and respectively controlling the liquid pumps 13 and the first bypass valves 16 of the first refrigeration system 10 and the second refrigeration system 20 to be opened, so that the first refrigeration system 10 and the second refrigeration system 20 are operated in a liquid pump refrigeration mode; wherein the second preset temperature is lower than the first preset temperature.
In the embodiment of the present invention, the specific values of the first preset temperature and the second preset temperature are not limited, and may be set by the user according to a test or experience; the specific type of the compressor 11 is not limited, and may be a fixed-frequency or variable-frequency compressor; the specific type of the condenser 12 is not limited, and may be, for example, an air-cooled condenser, a plate-type condenser, or a shell-and-tube condenser; the specific type of the liquid pump 13 is not limited, and may be, for example, a variable frequency pump or a pressure regulating pump with adjustable flow rate; the specific type of the throttling element 14 is not limited, and is preferably an electronic expansion valve with adjustable opening degree or a thermal expansion valve; the specific type of the evaporator 15 is not limited, and may be a finned tube evaporator or a more efficient parallel flow microchannel evaporator, or a plate evaporator, a shell-and-tube evaporator, etc., which will not be described herein. Alternative types of refrigerant in the closed circulation line formed by the compressor 11, the condenser 12, the liquid pump 13, the throttling element 14, and the evaporator 15 include R22, R410A, R407C, R744, R134a, R1234yf, R290, and R600a, and the like.
In the embodiment of the present invention, the first refrigeration system 10 and the second refrigeration system 20 may operate independently without affecting each other, or the cold carrying medium after heat exchange between the evaporator 15 of the first refrigeration system 10 and the evaporator 15 of the second refrigeration system 20 may be uniformly mixed and then delivered to the cooled medium for cooling.
The lift of the liquid pump 13 can be adjusted by its rotational speed. During specific implementation, the inlet pressure and the outlet pressure of the liquid pump 13 are obtained by the pressure detection module of the air conditioning system, the current lift of the liquid pump 13 is determined according to the inlet pressure and the outlet pressure, then the lift variation between the current lift and the target lift is determined, the rotating speed variation is determined according to the corresponding relation between the lift variation of the liquid pump 13 and the rotating speed variation of the liquid pump 13, and finally the rotating speed of the liquid pump 13 is regulated according to the rotating speed variation, so that the lift of the liquid pump 13 is regulated to the target lift. It is understood that, in the embodiment of the present invention, both the preset head and the first target head of the first refrigeration system 10 can be adjusted in the above manner.
In the embodiment of the invention, when the outdoor environment temperature is higher than the first preset temperature, the air conditioning system operates in a double-compressor refrigeration mode; when the outdoor environment temperature is not higher than the first preset temperature and is higher than the second preset temperature, the air-conditioning system needs to be switched from the double-compressor refrigeration mode to the double-liquid-pump refrigeration mode, at this time, the first refrigeration system 10 is controlled to enter the liquid pump refrigeration mode, and meanwhile, the second refrigeration system 20 is controlled to continue to operate in the compressor refrigeration mode, so that the air-conditioning system can keep certain refrigeration output in a time period established by the flow of the liquid pump 13 of the first refrigeration system 10; when the liquid pump 13 of the first refrigeration system 10 operates at a preset lift and realizes stable refrigeration output, controlling the second refrigeration system 20 to enter a liquid pump refrigeration mode, and simultaneously adjusting the liquid pump 13 of the first refrigeration system 10 to operate at a first target lift in the liquid pump refrigeration mode, so as to smoothly switch the air-conditioning system from the dual-compressor refrigeration mode to the dual-liquid pump refrigeration mode; and when the outdoor environment temperature is not more than the second preset temperature, the air conditioning system can be directly controlled to operate in a double-liquid-pump refrigeration mode. Compared with the prior art, the air conditioning system of the scheme can always keep certain refrigeration output in the switching process of the refrigeration mode, so that the working reliability of the air conditioning system is improved.
In the embodiment of the present invention, when the outdoor ambient temperature is not greater than the first preset temperature and greater than the second preset temperature, after controlling the second refrigeration system 20 to switch to the liquid pump refrigeration mode, the controller is further configured to: the head of the liquid pump 13 of the second refrigeration system 20 is adjusted to the second target head. By adopting the scheme, the liquid pump 10 of the first refrigerating system and the liquid pump 13 of the second refrigerating system 20 can be respectively operated at the target lift in the liquid pump refrigerating mode, so that the refrigerating requirement of the air conditioning system in the double-liquid pump refrigerating mode is ensured, and the working reliability of the air conditioning system is further improved.
In an embodiment of the present invention, the controller is further connected to an outdoor fan disposed at a condenser of each refrigeration system, and when the outdoor ambient temperature is not greater than a first preset temperature and greater than a second preset temperature, the controller is further configured to, after the liquid pump of the first refrigeration system operates at a preset lift, before the lift of the liquid pump of the first refrigeration system is adjusted to a first target lift: and determining a first fan rotating speed corresponding to the preset first condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan 18, and controlling the outdoor fan 18 of the first refrigeration system 10 to operate at the first fan rotating speed.
The correspondence between the condensing pressure and the rotation speed of the outdoor fan 18 may be a function operation relationship stored in the controller in advance or a mapping relationship based on a database, and the rotation speed of the outdoor fan 18 corresponding to the required condensing pressure can be obtained according to the correspondence. By adopting the above embodiment scheme, after the liquid pump 13 of the first refrigeration system 10 operates at the preset lift, before the lift of the liquid pump 13 of the first refrigeration system 10 is adjusted to the first target lift, the condensing pressure of the first refrigeration system 10 is reduced to the first condensing pressure required by the stable operation in the liquid pump refrigeration mode by controlling the rotating speed of the outdoor fan 18 of the first refrigeration system 10, so that the temperature of the refrigerant is reduced, and the refrigerating capacity of the first refrigeration system 10 after entering the liquid pump refrigeration mode can meet the refrigerating requirement.
In the embodiment of the present invention, when the outdoor ambient temperature is not greater than the first preset temperature and greater than the second preset temperature, before the first refrigeration system 10 switches to the liquid pump refrigeration mode, the controller is further configured to: and determining a second fan rotating speed corresponding to the preset second condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan 18, and controlling the outdoor fan 18 of the first refrigeration system 10 to operate at the second fan rotating speed, wherein it can be understood that the second condensing pressure is not less than the first condensing pressure.
By adopting the scheme of the embodiment, before the first refrigeration system 10 is controlled to be switched to the liquid pump refrigeration mode, the rotating speed of the outdoor fan 18 of the first refrigeration system 10 is controlled to reduce the condensation pressure of the first refrigeration system 10 to the second condensation pressure, so that the first refrigeration system 10 can refrigerate as soon as possible after being switched to the liquid pump refrigeration mode, meanwhile, a foundation is provided for further reducing the condensation pressure of the first refrigeration system 10 to the first condensation pressure subsequently, and the first refrigeration system 10 can stably operate in the liquid pump refrigeration mode rapidly. The specific values of the first condensing pressure and the second condensing pressure are not limited, and may be set according to experimental tests or experience, which is not described herein.
In the embodiment of the present invention, when the outdoor ambient temperature is not greater than the first preset temperature and greater than the second preset temperature, after the liquid pump 13 of the first refrigeration system 10 operates at the preset head and before the second refrigeration system 20 switches to operate in the liquid pump refrigeration mode, the controller is further configured to: and determining a third fan rotating speed corresponding to the preset third condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan 18, and controlling the outdoor fan 18 of the second refrigeration system 20 to operate at the third fan rotating speed. Similarly, by adopting the scheme of the embodiment, before the second refrigeration system 20 is controlled to switch to the liquid pump refrigeration mode, the condensing pressure of the second refrigeration system 20 is reduced to the third condensing pressure required by the stable operation in the liquid pump refrigeration mode by controlling the rotating speed of the outdoor fan 18 of the second refrigeration system 20, so that the temperature of the refrigerant is reduced, and the refrigerating capacity of the second refrigeration system 20 after entering the liquid pump refrigeration mode can meet the refrigeration requirement. Likewise, the specific value of the third condensing pressure may also be set according to experimental tests or experience, which is not limited in this application.
In an embodiment of the present invention, the temperature detecting module is further configured to detect a return air temperature in the room, and when the outdoor ambient temperature is not greater than a first preset temperature and greater than a second preset temperature, after the first refrigeration system is switched to operate in the liquid pump refrigeration mode and before the second refrigeration system is switched to operate in the liquid pump refrigeration mode, the controller is further configured to:
acquiring a first indoor return air temperature;
and determining a first refrigerating requirement of the second refrigerating system according to the first indoor return air temperature, determining a first output rotating speed of a compressor of the second refrigerating system according to the first refrigerating requirement, and controlling the compressor of the second refrigerating system to operate at the first output rotating speed.
It should be noted that, in an air conditioning system including a plurality of refrigeration systems, the refrigeration requirements of each refrigeration system are distributed by a distribution method prestored in the air conditioning system by default, each refrigeration system has a refrigeration requirement corresponding to any return air temperature, the refrigeration requirements of each refrigeration system at the same return air temperature may be the same or different, and it is only required to ensure that the sum of the refrigeration requirements of each refrigeration system at any return air temperature is equal to the total refrigeration requirement of the air conditioning system at the return air temperature.
In the above embodiment, during the time when the flow rate of the liquid pump of the first refrigeration system is established, the compressor of the second refrigeration system operates at the first output rotation speed determined by the refrigeration demand of the compressor at the first indoor return air temperature, so that the air conditioning system can maintain a certain refrigeration output.
In another embodiment of the present invention, the temperature detecting module is further configured to detect an indoor return air temperature, and when the outdoor ambient temperature is not greater than a first preset temperature and greater than a second preset temperature, after the first refrigeration system is switched to operate in the liquid pump refrigeration mode and before the second refrigeration system is switched to operate in the liquid pump refrigeration mode, the controller is further configured to:
acquiring a second indoor return air temperature;
determining the total refrigeration requirement of the air conditioning system according to the second indoor return air temperature, determining the second output rotating speed of the compressor of the second refrigeration system according to the total refrigeration requirement, and controlling the compressor of the second refrigeration system to operate at the second output rotating speed;
when the compressor of the second refrigeration system operates at the second output rotating speed for a preset time, acquiring the return air temperature in the third chamber;
and determining a second refrigeration requirement of the second refrigeration system according to the return air temperature in the third chamber, determining a third output rotating speed of a compressor of the second refrigeration system according to the second refrigeration requirement, and controlling the compressor of the second refrigeration system to operate in a liquid pump refrigeration mode when the second refrigeration system operates at the third output rotating speed.
In the embodiment, in the initial period of time when the first refrigeration system is switched to the pump refrigeration mode, the rotating speed of the compressor of the second refrigeration system is determined according to the total refrigeration demand of the air-conditioning system, that is, the second refrigeration system bears the total refrigeration demand of the air-conditioning system within the preset time period, so as to solve the problem of insufficient refrigeration capacity of the first refrigeration system due to slow flow rate establishment; after the compressor of the second refrigeration system runs at the second output rotating speed for a preset time, the liquid pump of the first refrigeration system already has certain refrigeration output, so that the refrigeration capacity of the second refrigeration system can be correspondingly reduced, and at the moment, the compressor of the second refrigeration system runs at the third output rotating speed determined by the refrigeration demand of the compressor of the second refrigeration system at the return air temperature in the third chamber, so that the situation that the compressor of the second refrigeration system always runs at a high load state and the service life of the compressor of the second refrigeration system is influenced can be avoided. The specific duration of the preset duration is not limited, and can be set by a user according to test tests or experiences, so long as the duration is not greater than the duration of the establishment of the liquid pump flow of the first refrigeration system.
As shown in fig. 3, 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, acquiring outdoor environment temperature;
step 102, when the outdoor environment temperature is higher than a first preset temperature, respectively controlling the opening of a compressor and a second bypass valve of the first refrigeration system and the second refrigeration system, and respectively controlling the closing of a liquid pump and a first bypass valve of the first refrigeration system and the second refrigeration system, so that the first refrigeration system and the second refrigeration system operate in a compressor refrigeration mode;
103, when the outdoor environment temperature is not higher than a first preset temperature and is higher than a second preset temperature, controlling a compressor and a second bypass valve of the first refrigeration system to be closed, and controlling a liquid pump and a first bypass valve of the first refrigeration system to be opened, so that the first refrigeration system is switched to operate in a liquid pump refrigeration mode, the second refrigeration system is controlled to continue to operate in a compressor refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to a preset lift; when the liquid pump of the first refrigeration system runs at a preset lift, controlling a compressor and a second bypass valve of the second refrigeration system to be closed and controlling the liquid pump and a first bypass valve of the second refrigeration system to be opened, so that the second refrigeration system is switched to run in a liquid pump refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to a first target lift; wherein the first target lift is not less than a preset lift;
104, when the outdoor environment temperature is not higher than a second preset temperature, respectively controlling the compressors and the second bypass valves of the first refrigeration system and the second refrigeration system to be closed, and respectively controlling the liquid pumps and the first bypass valves of the first refrigeration system and the second refrigeration system to be opened, so that the first refrigeration system and the second refrigeration system are operated in a liquid pump refrigeration mode; wherein the second preset temperature is lower than the first preset temperature.
By adopting the operation control method of the air conditioning system provided by the embodiment of the invention, the air conditioning system can always keep certain refrigeration output in the switching process of the refrigeration mode, thereby improving the working reliability of the air conditioning system.
In a specific embodiment, when the outdoor ambient temperature is not greater than the first preset temperature and greater than the second preset temperature, after controlling the second refrigeration system to switch to operate in the liquid pump refrigeration mode, the method further comprises:
the head of the liquid pump of the second refrigeration system is adjusted to a second target head.
In a specific embodiment, when the outdoor ambient temperature is not greater than the first preset temperature and greater than the second preset temperature, before the head of the liquid pump of the first refrigeration system is adjusted to the first target head after the liquid pump of the first refrigeration system is operated at the preset head, the method further comprises:
and determining a first fan rotating speed corresponding to the preset first condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the first refrigeration system to operate at the first fan rotating speed.
In a specific embodiment, when the outdoor ambient temperature is not greater than the first preset temperature and is greater than the second preset temperature, before the first refrigeration system switches to operate in the liquid pump refrigeration mode, the method further comprises:
and determining the rotating speed of a second fan corresponding to the preset second condensation pressure according to the corresponding relation between the condensation pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the first refrigeration system to operate at the rotating speed of the second fan.
In a specific embodiment, when the outdoor ambient temperature is not greater than the first preset temperature and greater than the second preset temperature, after the liquid pump of the first refrigeration system operates at the preset head and before the second refrigeration system switches to operate in the liquid pump refrigeration mode, the method further comprises:
and determining the rotating speed of a third fan corresponding to the preset third condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the second refrigeration system to operate at the rotating speed of the third fan.
In a specific embodiment, when the outdoor ambient temperature is not greater than the first preset temperature and greater than the second preset temperature, after the first refrigeration system is switched to operate in the liquid pump refrigeration mode and before the second refrigeration system is switched to operate in the liquid pump refrigeration mode, the method further comprises:
acquiring a first indoor return air temperature;
and determining a first refrigerating requirement of the second refrigerating system according to the first indoor return air temperature, determining a first output rotating speed of a compressor of the second refrigerating system according to the first refrigerating requirement, and controlling the compressor of the second refrigerating system to operate at the first output rotating speed.
In a specific embodiment, when the outdoor ambient temperature is not greater than the first preset temperature and greater than the second preset temperature, after the first refrigeration system is switched to operate in the liquid pump refrigeration mode and before the second refrigeration system is switched to operate in the liquid pump refrigeration mode, the method further comprises:
acquiring a second indoor return air temperature;
determining the total refrigeration requirement of the air conditioning system according to the second indoor return air temperature, determining the second output rotating speed of the compressor of the second refrigeration system according to the total refrigeration requirement, and controlling the compressor of the second refrigeration system to operate at the second output rotating speed;
when the compressor of the second refrigeration system operates at the second output rotating speed for a preset time, acquiring the return air temperature in the third chamber;
and determining a second refrigeration requirement of the second refrigeration system according to the return air temperature in the third chamber, determining a third output rotating speed of a compressor of the second refrigeration system according to the second refrigeration requirement, and controlling the compressor of the second refrigeration system to operate in a liquid pump refrigeration mode when the second refrigeration system operates at the third output rotating speed.
As shown in fig. 4, 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 acquisition unit 100 for acquiring an outdoor ambient temperature;
a control unit 200 for:
when the outdoor environment temperature is higher than a first preset temperature, respectively controlling the opening of a compressor and a second bypass valve of the first refrigeration system and the second refrigeration system, and respectively controlling the closing of a liquid pump and a first bypass valve of the first refrigeration system and the second refrigeration system, so that the first refrigeration system and the second refrigeration system operate in a compressor refrigeration mode;
when the outdoor environment temperature is not higher than the first preset temperature and is higher than the second preset temperature, controlling a compressor and a second bypass valve of the first refrigeration system to be closed, and controlling a liquid pump and a first bypass valve of the first refrigeration system to be opened, so that the first refrigeration system is switched to operate in a liquid pump refrigeration mode, the second refrigeration system is controlled to continue to operate in a compressor refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to be a preset lift; when the liquid pump of the first refrigeration system runs at a preset lift, controlling a compressor and a second bypass valve of the second refrigeration system to be closed and controlling the liquid pump and a first bypass valve of the second refrigeration system to be opened, so that the second refrigeration system is switched to run in a liquid pump refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to a first target lift; wherein the first target lift is not less than a preset lift;
when the outdoor environment temperature is not higher than the second preset temperature, respectively controlling the compressors and the second bypass valves of the first refrigeration system and the second refrigeration system to be closed, and respectively controlling the liquid pumps and the first bypass valves of the first refrigeration system and the second refrigeration system to be opened, so that the first refrigeration system and the second refrigeration system are operated in a liquid pump refrigeration mode; wherein the second preset temperature is lower than the first preset temperature.
By adopting the operation control device of the air conditioning system provided by the embodiment of the invention, the air conditioning system can always keep certain refrigeration output in the switching process of the refrigeration mode, so that the working reliability of the air conditioning system is improved.
In a specific embodiment, when the outdoor ambient temperature is not greater than the first preset temperature and greater than the second preset temperature, after controlling the second refrigeration system to switch to operate in the liquid pump refrigeration mode, the control unit is further configured to:
the head of the liquid pump of the second refrigeration system is adjusted to a second target head.
In a specific embodiment, when the outdoor ambient temperature is not greater than the first preset temperature and greater than the second preset temperature, the control unit is further configured to, after the liquid pump of the first refrigeration system is operated at the preset head and before the head of the liquid pump of the first refrigeration system is adjusted to the first target head:
and determining a first fan rotating speed corresponding to the preset first condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the first refrigeration system to operate at the first fan rotating speed.
In a specific embodiment, when the outdoor ambient temperature is not greater than the first preset temperature and is greater than the second preset temperature, the control unit is further configured to:
and determining the rotating speed of a second fan corresponding to the preset second condensation pressure according to the corresponding relation between the condensation pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the first refrigeration system to operate at the rotating speed of the second fan.
In a specific embodiment, when the outdoor ambient temperature is not greater than the first preset temperature and greater than the second preset temperature, after the liquid pump of the first refrigeration system operates at the preset head and before the second refrigeration system switches to operate in the liquid pump refrigeration mode, the control unit is further configured to:
and determining the rotating speed of a third fan corresponding to the preset third condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the second refrigeration system to operate at the rotating speed of the third fan.
In a specific embodiment, when the outdoor ambient temperature is not greater than the first preset temperature and greater than the second preset temperature, the obtaining unit is further configured to obtain the first indoor return air temperature after the first refrigeration system is switched to operate in the liquid pump refrigeration mode and before the second refrigeration system is switched to operate in the liquid pump refrigeration mode;
the control unit is further configured to:
and determining a first refrigerating requirement of the second refrigerating system according to the first indoor return air temperature, determining a first output rotating speed of a compressor of the second refrigerating system according to the first refrigerating requirement, and controlling the compressor of the second refrigerating system to operate at the first output rotating speed.
In a specific embodiment, when the outdoor ambient temperature is not greater than the first preset temperature and greater than the second preset temperature, the obtaining unit is further configured to obtain the second indoor return air temperature after the first refrigeration system is switched to operate in the liquid pump refrigeration mode and before the second refrigeration system is switched to operate in the liquid pump refrigeration mode;
the control unit is further configured to: determining the total refrigeration requirement of the air conditioning system according to the second indoor return air temperature, determining the second output rotating speed of the compressor of the second refrigeration system according to the total refrigeration requirement, and controlling the compressor of the second refrigeration system to operate at the second output rotating speed;
the obtaining unit is further used for obtaining the return air temperature in the third chamber after the compressor of the second refrigeration system operates at the second output rotating speed for a preset time;
the control unit is further configured to: and determining a second refrigeration requirement of the second refrigeration system according to the return air temperature in the third chamber, determining a third output rotating speed of a compressor of the second refrigeration system according to the second refrigeration requirement, and controlling the compressor of the second refrigeration system to operate in a liquid pump refrigeration mode when the second refrigeration system operates at the third output rotating speed.
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 (21)

1. An air conditioning system comprises a first refrigeration system and a second refrigeration system, wherein each refrigeration system comprises a compressor, a condenser, a liquid pump, a throttling element and an evaporator which are sequentially connected through a pipeline and form closed circulation, a first bypass valve connected with the compressor in parallel and a second bypass valve connected with the liquid pump in parallel; it is characterized by also comprising:
the temperature detection module is used for detecting the outdoor environment temperature;
the controller is connected with the temperature detection module, the compressor of each refrigerating system, the liquid pump, the first bypass valve and the second bypass valve respectively, and is used for:
acquiring the outdoor environment temperature;
when the outdoor environment temperature is higher than a first preset temperature, respectively controlling the opening of a compressor and a second bypass valve of the first refrigeration system and the second refrigeration system, and respectively controlling the closing of a liquid pump and a first bypass valve of the first refrigeration system and the second refrigeration system, so that the first refrigeration system and the second refrigeration system operate in a compressor refrigeration mode;
when the outdoor environment temperature is not higher than the first preset temperature and is higher than the second preset temperature, controlling a compressor and a second bypass valve of the first refrigeration system to be closed, and controlling a liquid pump and a first bypass valve of the first refrigeration system to be opened, so that the first refrigeration system is switched to operate in a liquid pump refrigeration mode, the second refrigeration system is controlled to continue to operate in a compressor refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to be a preset lift; when the liquid pump of the first refrigeration system runs at a preset lift, controlling a compressor and a second bypass valve of the second refrigeration system to be closed and controlling the liquid pump and a first bypass valve of the second refrigeration system to be opened, so that the second refrigeration system is switched to run in a liquid pump refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to a first target lift; wherein the first target lift is not less than a preset lift;
when the outdoor environment temperature is not higher than the second preset temperature, respectively controlling the compressors and the second bypass valves of the first refrigeration system and the second refrigeration system to be closed, and respectively controlling the liquid pumps and the first bypass valves of the first refrigeration system and the second refrigeration system to be opened, so that the first refrigeration system and the second refrigeration system operate in a liquid pump refrigeration mode; wherein the second preset temperature is lower than the first preset temperature.
2. The air conditioning system of claim 1, wherein when the outdoor ambient temperature is not greater than the first predetermined temperature and greater than the second predetermined temperature, after controlling the second refrigeration system to operate in the liquid pump refrigeration mode, the controller is further configured to:
the head of the liquid pump of the second refrigeration system is adjusted to a second target head.
3. The air conditioning system of claim 1,
the controller is also connected with an outdoor fan arranged at the condenser of each refrigerating system;
when the outdoor environment temperature is not greater than the first preset temperature and is greater than the second preset temperature, after the liquid pump of the first refrigeration system operates at the preset lift, and before the lift of the liquid pump of the first refrigeration system is adjusted to the first target lift, the controller is further configured to:
and determining a first fan rotating speed corresponding to the preset first condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the first refrigeration system to operate at the first fan rotating speed.
4. The air conditioning system of claim 1,
the controller is also connected with an outdoor fan arranged at the condenser of each refrigerating system;
when the outdoor environment temperature is not greater than the first preset temperature and greater than the second preset temperature, before the first refrigeration system is switched to operate in the liquid pump refrigeration mode, the controller is further configured to:
and determining the rotating speed of a second fan corresponding to the preset second condensation pressure according to the corresponding relation between the condensation pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the first refrigeration system to operate at the rotating speed of the second fan.
5. The air conditioning system of claim 1,
the controller is also connected with an outdoor fan arranged at the condenser of each refrigerating system;
when the outdoor environment temperature is not greater than the first preset temperature and greater than the second preset temperature, after the liquid pump of the first refrigeration system operates at the preset lift, and before the second refrigeration system switches to operate in a liquid pump refrigeration mode, the controller is further configured to:
and determining the rotating speed of a third fan corresponding to the preset third condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the second refrigeration system to operate at the rotating speed of the third fan.
6. The air conditioning system as claimed in any one of claims 1 to 5,
the temperature detection module is also used for detecting the indoor return air temperature;
when the outdoor environment temperature is not greater than the first preset temperature and greater than the second preset temperature, after the first refrigeration system is switched to operate in the liquid pump refrigeration mode and before the second refrigeration system is switched to operate in the liquid pump refrigeration mode, the controller is further configured to:
acquiring a first indoor return air temperature;
and determining a first refrigerating requirement of the second refrigerating system according to the first indoor return air temperature, determining a first output rotating speed of a compressor of the second refrigerating system according to the first refrigerating requirement, and controlling the compressor of the second refrigerating system to operate at the first output rotating speed.
7. The air conditioning system as claimed in any one of claims 1 to 5,
the temperature detection module is also used for detecting the indoor return air temperature;
when the outdoor environment temperature is not greater than the first preset temperature and greater than the second preset temperature, after the first refrigeration system is switched to operate in the liquid pump refrigeration mode and before the second refrigeration system is switched to operate in the liquid pump refrigeration mode, the controller is further configured to:
acquiring a second indoor return air temperature;
determining the total refrigeration requirement of the air conditioning system according to the second indoor return air temperature, determining the second output rotating speed of the compressor of the second refrigeration system according to the total refrigeration requirement, and controlling the compressor of the second refrigeration system to operate at the second output rotating speed;
when the compressor of the second refrigeration system operates at the second output rotating speed for a preset time, acquiring the return air temperature in the third chamber;
and determining a second refrigeration requirement of the second refrigeration system according to the return air temperature in the third chamber, determining a third output rotating speed of a compressor of the second refrigeration system according to the second refrigeration requirement, and controlling the compressor of the second refrigeration system to operate in a liquid pump refrigeration mode when the second refrigeration system operates at the third output rotating speed.
8. An operation control method applied to the air conditioning system according to claim 1, characterized by comprising:
acquiring the outdoor environment temperature;
when the outdoor environment temperature is higher than a first preset temperature, respectively controlling the opening of a compressor and a second bypass valve of the first refrigeration system and the second refrigeration system, and respectively controlling the closing of a liquid pump and a first bypass valve of the first refrigeration system and the second refrigeration system, so that the first refrigeration system and the second refrigeration system operate in a compressor refrigeration mode;
when the outdoor environment temperature is not higher than the first preset temperature and is higher than the second preset temperature, controlling a compressor and a second bypass valve of the first refrigeration system to be closed, and controlling a liquid pump and a first bypass valve of the first refrigeration system to be opened, so that the first refrigeration system is switched to operate in a liquid pump refrigeration mode, the second refrigeration system is controlled to continue to operate in a compressor refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to be a preset lift; when the liquid pump of the first refrigeration system runs at a preset lift, controlling a compressor and a second bypass valve of the second refrigeration system to be closed and controlling the liquid pump and a first bypass valve of the second refrigeration system to be opened, so that the second refrigeration system is switched to run in a liquid pump refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to a first target lift; wherein the first target lift is not less than a preset lift;
when the outdoor environment temperature is not higher than the second preset temperature, respectively controlling the compressors and the second bypass valves of the first refrigeration system and the second refrigeration system to be closed, and respectively controlling the liquid pumps and the first bypass valves of the first refrigeration system and the second refrigeration system to be opened, so that the first refrigeration system and the second refrigeration system operate in a liquid pump refrigeration mode; wherein the second preset temperature is lower than the first preset temperature.
9. The operation control method of an air conditioning system according to claim 8, wherein when the outdoor ambient temperature is not more than the first preset temperature and more than the second preset temperature, after controlling the second refrigeration system to be switched to operate in the liquid pump refrigeration mode, the method further comprises:
the head of the liquid pump of the second refrigeration system is adjusted to a second target head.
10. The operation control method of an air conditioning system according to claim 8, wherein when the outdoor ambient temperature is not more than the first preset temperature and more than the second preset temperature, before the head of the liquid pump of the first refrigeration system is adjusted to the first target head after the liquid pump of the first refrigeration system is operated at the preset head, the method further comprises:
and determining a first fan rotating speed corresponding to the preset first condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the first refrigeration system to operate at the first fan rotating speed.
11. The operation control method of an air conditioning system as set forth in claim 8, wherein when the outdoor ambient temperature is not more than the first preset temperature and more than the second preset temperature, before the first refrigeration system is switched to the operation in the liquid pump refrigeration mode, the method further includes:
and determining the rotating speed of a second fan corresponding to the preset second condensation pressure according to the corresponding relation between the condensation pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the first refrigeration system to operate at the rotating speed of the second fan.
12. The operation control method of an air conditioning system according to claim 8, wherein when the outdoor ambient temperature is not more than the first preset temperature and more than the second preset temperature, after the liquid pump of the first refrigeration system is operated at the preset head and before the second refrigeration system is switched to be operated in the liquid pump cooling mode, the method further comprises:
and determining the rotating speed of a third fan corresponding to the preset third condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the second refrigeration system to operate at the rotating speed of the third fan.
13. The operation control method of an air conditioning system according to any one of claims 8 to 12, wherein when the outdoor ambient temperature is not more than the first preset temperature and more than the second preset temperature, after the first refrigeration system is switched to operate in the liquid pump refrigeration mode and before the second refrigeration system is switched to operate in the liquid pump refrigeration mode, the method further comprises:
acquiring a first indoor return air temperature;
and determining a first refrigerating requirement of the second refrigerating system according to the first indoor return air temperature, determining a first output rotating speed of a compressor of the second refrigerating system according to the first refrigerating requirement, and controlling the compressor of the second refrigerating system to operate at the first output rotating speed.
14. The operation control method of an air conditioning system according to any one of claims 8 to 12, wherein when the outdoor ambient temperature is not more than the first preset temperature and more than the second preset temperature, after the first refrigeration system is switched to operate in the liquid pump refrigeration mode and before the second refrigeration system is switched to operate in the liquid pump refrigeration mode, the method further comprises:
acquiring a second indoor return air temperature;
determining the total refrigeration requirement of the air conditioning system according to the second indoor return air temperature, determining the second output rotating speed of the compressor of the second refrigeration system according to the total refrigeration requirement, and controlling the compressor of the second refrigeration system to operate at the second output rotating speed;
when the compressor of the second refrigeration system operates at the second output rotating speed for a preset time, acquiring the return air temperature in the third chamber;
and determining a second refrigeration requirement of the second refrigeration system according to the return air temperature in the third chamber, determining a third output rotating speed of a compressor of the second refrigeration system according to the second refrigeration requirement, and controlling the compressor of the second refrigeration system to operate in a liquid pump refrigeration mode when the second refrigeration system operates at the third output rotating speed.
15. An operation control device applied to the air conditioning system according to claim 1, comprising:
an acquisition unit for acquiring an outdoor ambient temperature;
a control unit for:
when the outdoor environment temperature is higher than a first preset temperature, respectively controlling the opening of a compressor and a second bypass valve of the first refrigeration system and the second refrigeration system, and respectively controlling the closing of a liquid pump and a first bypass valve of the first refrigeration system and the second refrigeration system, so that the first refrigeration system and the second refrigeration system operate in a compressor refrigeration mode;
when the outdoor environment temperature is not higher than the first preset temperature and is higher than the second preset temperature, controlling a compressor and a second bypass valve of the first refrigeration system to be closed, and controlling a liquid pump and a first bypass valve of the first refrigeration system to be opened, so that the first refrigeration system is switched to operate in a liquid pump refrigeration mode, the second refrigeration system is controlled to continue to operate in a compressor refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to be a preset lift; when the liquid pump of the first refrigeration system runs at a preset lift, controlling a compressor and a second bypass valve of the second refrigeration system to be closed and controlling the liquid pump and a first bypass valve of the second refrigeration system to be opened, so that the second refrigeration system is switched to run in a liquid pump refrigeration mode, and the lift of the liquid pump of the first refrigeration system is adjusted to a first target lift; wherein the first target lift is not less than a preset lift;
when the outdoor environment temperature is not higher than the second preset temperature, respectively controlling the compressors and the second bypass valves of the first refrigeration system and the second refrigeration system to be closed, and respectively controlling the liquid pumps and the first bypass valves of the first refrigeration system and the second refrigeration system to be opened, so that the first refrigeration system and the second refrigeration system operate in a liquid pump refrigeration mode; wherein the second preset temperature is lower than the first preset temperature.
16. The operation control device of the air conditioning system according to claim 15, wherein when the outdoor ambient temperature is not more than the first preset temperature and more than the second preset temperature, after controlling the second refrigeration system to be switched to operate in the liquid pump refrigeration mode, the control unit is further configured to:
the head of the liquid pump of the second refrigeration system is adjusted to a second target head.
17. The operation control device of an air conditioning system according to claim 15, wherein when the outdoor ambient temperature is not more than the first preset temperature and more than the second preset temperature, before the head of the liquid pump of the first refrigeration system is adjusted to the first target head after the liquid pump of the first refrigeration system is operated at the preset head, the control unit is further configured to:
and determining a first fan rotating speed corresponding to the preset first condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the first refrigeration system to operate at the first fan rotating speed.
18. The operation control device of an air conditioning system according to claim 15, wherein when the outdoor ambient temperature is not more than the first preset temperature and more than the second preset temperature, before the first refrigeration system is switched to operate in the liquid pump refrigeration mode, the control unit is further configured to:
and determining the rotating speed of a second fan corresponding to the preset second condensation pressure according to the corresponding relation between the condensation pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the first refrigeration system to operate at the rotating speed of the second fan.
19. The operation control device of an air conditioning system according to claim 15, wherein when the outdoor ambient temperature is not more than the first preset temperature and more than the second preset temperature, the control unit is further configured to, after the liquid pump of the first refrigeration system is operated at the preset head and before the second refrigeration system is switched to be operated in the liquid pump refrigeration mode:
and determining the rotating speed of a third fan corresponding to the preset third condensing pressure according to the corresponding relation between the condensing pressure and the rotating speed of the outdoor fan, and controlling the outdoor fan of the second refrigeration system to operate at the rotating speed of the third fan.
20. The operation control device of an air conditioning system according to any one of claims 15 to 19, wherein the obtaining unit is further configured to obtain the first indoor return air temperature after the first refrigeration system is switched to operate in the liquid pump refrigeration mode and before the second refrigeration system is switched to operate in the liquid pump refrigeration mode when the outdoor ambient temperature is not more than the first preset temperature and more than the second preset temperature;
the control unit is further configured to:
and determining a first refrigerating requirement of the second refrigerating system according to the first indoor return air temperature, determining a first output rotating speed of a compressor of the second refrigerating system according to the first refrigerating requirement, and controlling the compressor of the second refrigerating system to operate at the first output rotating speed.
21. The operation control device of an air conditioning system according to any one of claims 15 to 19, wherein the obtaining unit is further configured to obtain the second indoor return air temperature after the first refrigeration system is switched to operate in the liquid pump refrigeration mode and before the second refrigeration system is switched to operate in the liquid pump refrigeration mode when the outdoor ambient temperature is not more than the first preset temperature and is more than the second preset temperature;
the control unit is further configured to: determining the total refrigeration requirement of the air conditioning system according to the second indoor return air temperature, determining the second output rotating speed of the compressor of the second refrigeration system according to the total refrigeration requirement, and controlling the compressor of the second refrigeration system to operate at the second output rotating speed;
the obtaining unit is further used for obtaining the return air temperature in the third chamber after the compressor of the second refrigeration system operates at the second output rotating speed for a preset time;
the control unit is further configured to: and determining a second refrigeration requirement of the second refrigeration system according to the return air temperature in the third chamber, determining a third output rotating speed of a compressor of the second refrigeration system according to the second refrigeration requirement, and controlling the compressor of the second refrigeration system to operate in a liquid pump refrigeration mode when the second refrigeration system operates at the third output rotating speed.
CN201811478360.7A 2018-12-05 2018-12-05 Air conditioning system, and operation control method and device of air conditioning system Active CN111271831B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811478360.7A CN111271831B (en) 2018-12-05 2018-12-05 Air conditioning system, and operation control method and device of air conditioning system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811478360.7A CN111271831B (en) 2018-12-05 2018-12-05 Air conditioning system, and operation control method and device of air conditioning system

Publications (2)

Publication Number Publication Date
CN111271831A CN111271831A (en) 2020-06-12
CN111271831B true CN111271831B (en) 2021-05-25

Family

ID=70996624

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811478360.7A Active CN111271831B (en) 2018-12-05 2018-12-05 Air conditioning system, and operation control method and device of air conditioning system

Country Status (1)

Country Link
CN (1) CN111271831B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112797598B (en) * 2020-12-30 2022-07-26 宁波奥克斯电气股份有限公司 Indoor unit control method and device of multi-connected air conditioner and air conditioner
CN116182337A (en) * 2021-11-26 2023-05-30 维谛技术有限公司 An air-conditioning unit, its operation control method, and its operation control device
CN116182338A (en) * 2021-11-26 2023-05-30 维谛技术有限公司 A computer room air conditioner, its operation control method and its operation control device
CN116182335B (en) * 2021-11-26 2025-07-01 维谛技术有限公司 A computer room air conditioner, operation control method and operation control device
CN115962554B (en) * 2022-12-20 2024-09-20 珠海格力电器股份有限公司 Fluorine pump refrigerating system, control method and device thereof and storage medium
CN116379660B (en) * 2023-05-06 2024-12-24 江苏拓米洛高端装备股份有限公司 Control method of refrigerating system and refrigerating system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3584276B2 (en) * 2000-06-30 2004-11-04 株式会社日立製作所 Air conditioning system
CN101280976A (en) * 2008-05-30 2008-10-08 天津商业大学 CO2/NH3 combined refrigeration system
CN101504222B (en) * 2009-02-19 2011-07-27 艾默生网络能源有限公司 Air conditioner
US9038404B2 (en) * 2011-04-19 2015-05-26 Liebert Corporation High efficiency cooling system
CN102607122A (en) * 2012-04-01 2012-07-25 海信（山东）空调有限公司 Dual-drive heating pipe circulating unit
CN202581628U (en) * 2012-04-01 2012-12-05 海信（山东）空调有限公司 Hybrid-power heat pipe circulation set
CN105805825B (en) * 2014-12-30 2018-12-25 维谛技术有限公司 A kind of air-conditioning and its control method
CN107726491B (en) * 2016-08-12 2020-02-18 维谛技术有限公司 Novel heat pipe machine room air conditioning system and operation method thereof
US10704816B2 (en) * 2017-02-07 2020-07-07 Lennox Industries Inc. Liquid transfer pump cycle

Also Published As

Publication number Publication date
CN111271831A (en) 2020-06-12

Similar Documents

Publication Publication Date Title
CN111271831B (en) Air conditioning system, and operation control method and device of air conditioning system
CN106642416B (en) Air conditioning system, composite condenser and operation control method and device of air conditioning system
CN111271832B (en) Air conditioning system, and operation control method and device of air conditioning system
CN109237844B (en) Air conditioning system, and refrigeration control method and device of air conditioning system
US10323862B2 (en) Air conditioning unit having dynamic target condensing and evaporating values based on load requirements
US6843067B2 (en) Air conditioner and method for controlling electronic expansion valve of air conditioner
CN105180348A (en) Machine room air conditioner system and control method thereof
CN110220257B (en) Air conditioning system, and operation control method and device of air conditioning system
CN101629753B (en) Air conditioner and control method thereof
CN110906500B (en) Refrigeration control method, device and air conditioner for an air conditioner
CN110319541B (en) Unloading adjustment control method of large-displacement variable-frequency multi-split system
KR100640855B1 (en) Control method of multi air conditioner
CN111271833A (en) Air conditioning system, and operation control method and device of air conditioning system
KR101964946B1 (en) temperature compensated cooling system high efficiency
US20040098993A1 (en) Air conditioner and method for controlling the same
CN115095964B (en) Heat recovery multi-split system and operation method thereof
KR101390989B1 (en) Hybrid cooling system
KR20060066838A (en) Control method of indoor unit of multi type air conditioner
CN107024013B (en) Air conditioner and control method thereof
JP2000266368A (en) Air conditioning system
CN117739551A (en) Heat pump system, starting method, computer device and storage medium
CN211233434U (en) Showcase refrigeration system
CN115264922A (en) Air conditioner
JP4063041B2 (en) Control method of multi-room air conditioner
CN110220258B (en) Air conditioning system, and operation control method and device of air conditioning system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant