EP3561413A1 - Dispositif de détermination de charge de réfrigérant, système de climatisation, procédé de détermination de charge de réfrigérant et programme - Google Patents

Dispositif de détermination de charge de réfrigérant, système de climatisation, procédé de détermination de charge de réfrigérant et programme Download PDF

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Publication number
EP3561413A1
EP3561413A1 EP18761976.2A EP18761976A EP3561413A1 EP 3561413 A1 EP3561413 A1 EP 3561413A1 EP 18761976 A EP18761976 A EP 18761976A EP 3561413 A1 EP3561413 A1 EP 3561413A1
Authority
EP
European Patent Office
Prior art keywords
subcooling
expansion valve
air conditioning
conditioning system
refrigerant amount
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.)
Withdrawn
Application number
EP18761976.2A
Other languages
German (de)
English (en)
Inventor
Takahiro Kato
Daisuke Sugimoto
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.)
Mitsubishi Heavy Industries Thermal Systems Ltd
Original Assignee
Mitsubishi Heavy Industries Thermal Systems 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 Mitsubishi Heavy Industries Thermal Systems Ltd filed Critical Mitsubishi Heavy Industries Thermal Systems Ltd
Publication of EP3561413A1 publication Critical patent/EP3561413A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0313—Pressure sensors near the outdoor heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/13—Economisers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves

Definitions

  • the present invention relates to a refrigerant amount determination device, an air conditioning system, a refrigerant amount determination method, and a program.
  • PTL 1 discloses a refrigerant charged amount determining method.
  • an air conditioning system is operated in a cooling cycle and if a degree of opening of an indoor expansion valve and/or a subcooling expansion valve is equal to or larger than a predetermined value, it is determined that the refrigerant charged amount is in a gas low state.
  • a gas low state in an air conditioning system can be detected. If such a gas low state in the air conditioning system is detected, the air conditioning system can be operated efficiently by increasing a refrigerant amount in the air conditioning system. It is more preferred that determining whether or not the refrigerant amount in the air conditioning system is appropriate is achieved with higher accuracy.
  • the present invention provides a refrigerant amount determination device, an air conditioning system, a refrigerant amount determination method, and a program capable of achieving determination of whether or not a refrigerant amount in an air conditioning system is appropriate with higher accuracy.
  • a refrigerant amount determination device includes an information acquisition unit, a subcooling level regulation unit, and a refrigerant amount determination unit.
  • the information acquisition unit acquires expansion valve opening-degree information that indicates a degree of opening of an expansion valve subject to determination, the expansion valve being at least either one of an expansion valve in an indoor unit and an expansion valve on a side of a subcooling heat exchanger included in an air conditioning system.
  • the subcooling level regulation unit increases a subcooling level of an outdoor heat exchanger included in the air conditioning system.
  • the refrigerant amount determination unit determines whether or not a refrigerant amount in the air conditioning system is appropriate based on the degree of opening of the expansion valve subject to determination before increasing the subcooling level and the degree of opening of the expansion valve subject to determination after increasing the subcooling level.
  • the refrigerant amount determination device may increase the subcooling level by reducing a degree of opening of an expansion valve on a side of the outdoor heat exchanger included in the air conditioning system.
  • the refrigerant amount determination device may determine whether or not a refrigerant amount in the air conditioning system is appropriate further based on the subcooling level before being increased by the subcooling level regulation unit.
  • the refrigerant amount determination device may change the subcooling level to a first subcooling level, a second subcooling level that is larger than the first subcooling level, and a third subcooling level that is larger than the second subcooling level, respectively, and determine whether or not a refrigerant amount in the air conditioning system is appropriate based on a degree of opening of the expansion valve subject to determination each for the first subcooling level, the second subcooling level, and the third subcooling level.
  • the air conditioning system includes either one of the refrigerant amount determination devices described above.
  • a refrigerant amount determination method includes a process of increasing a subcooling level of an outdoor heat exchanger included in an air conditioning system, and a process of determining whether or not a refrigerant amount in the air conditioning system is appropriate based on a degree of opening of an expansion valve subject to determination, the expansion valve being at least either one of an expansion valve in an indoor unit and an expansion valve on a side of a subcooling heat exchanger included in the air conditioning system before increasing a subcooling level, and the degree of opening of the expansion valve subject to determination after increasing the subcooling level.
  • a program is configured to cause a computer, the computer being configured to control an air conditioning system, to execute a process of increasing a subcooling level of an outdoor heat exchanger included in the air conditioning system; and a process of determining whether or not a refrigerant amount in the air conditioning system is appropriate based on a degree of opening of an expansion valve subject to determination, the expansion valve being at least either one of an expansion valve in an indoor unit and an expansion valve on a side of a subcooling heat exchanger included in the air conditioning system before increasing a subcooling level, and the degree of opening of the expansion valve subject to determination after increasing the subcooling level.
  • the refrigerant amount determination device determines whether or not a refrigerant amount in an air conditioning system is appropriate is achieved with higher accuracy.
  • FIG. 1 is an outline block diagram illustrating a functional configuration of an air conditioning system according to the embodiment.
  • an air conditioning system 1 includes an air conditioning system main body 100 and a control device 400.
  • the air conditioning system main body 100 operates according to control by the control device 400 and regulates inside air temperature subject to temperature regulation.
  • the subject for which the air conditioning system main body 100 regulates temperature is not limited to an indoor temperature.
  • the air conditioning system main body 100 may regulate air temperature in an outdoor space.
  • FIG. 2 is an outline configuration diagram illustrating a device configuration of the air conditioning system main body 100.
  • the air conditioning system main body 100 includes an outdoor unit 200 and an indoor unit 300.
  • the outdoor unit 200 includes a compressor 211, an accumulator 212, a four-way valve 221, an outdoor heat exchanger 231, an outdoor-side expansion valve 232, a receiver tank 241, a subcooling heat exchanger 251, a subcooling-side expansion valve 252, a high-pressure-side pressure sensor 291, and an outdoor heat exchanger outlet temperature sensor 292.
  • the indoor unit 300 includes an indoor heat exchanger 311 and an indoor unit-side expansion valve 312.
  • FIG. 2 illustrates an example of the air conditioning system main body 100 including a plurality of indoor units 300.
  • the air conditioning system main body 100 may include at least one indoor unit 300.
  • the air conditioning system main body 100 may also include at least one outdoor unit 200.
  • the compressor 211, the accumulator 212, the four-way valve 221, the receiver tank 241, the subcooling heat exchanger 251, and the subcooling-side expansion valve 252 may be installed in a place other than the outdoor unit 200.
  • some or all of the compressor 211, the accumulator 212, the four-way valve 221, the receiver tank 241, the subcooling heat exchanger 251, and the subcooling-side expansion valve 252 may be included in a separate device from the outdoor unit 200, and installed outside of the outdoor unit 200, for example.
  • the air conditioning system 1 may be a system dedicated to cooling.
  • the four-way valve 221 switches a cooling cycle and a heating cycle.
  • a refrigerant gas compressed in the compressor 211 is introduced to the outdoor heat exchanger 231 via the four-way valve 221.
  • the refrigerant gas introduced to the outdoor heat exchanger 231 dissipates heat by a heat exchange with outside air and then condenses.
  • the refrigerant that has become a fluid by the condensation is introduced to the receiver tank 241 via the outdoor-side expansion valve 232. In the receiver tank 241, an extra amount of the refrigerant is accumulated to correspond any change of operation conditions.
  • the refrigerant flown out from the receiver tank 241 is subcooled in the subcooling heat exchanger 251 and then introduced to the indoor unit 300.
  • the subcooling heat exchanger 251 subcools the refrigerant to prevent the refrigerant from evaporating in a piping between the outdoor unit 200 and the indoor unit 300.
  • part of the refrigerant fluid flown out from the receiver tank 241 is decompressed by the subcooling-side expansion valve 252. After that, the refrigerant fluid is introduced to the subcooling heat exchanger 251 and then evaporates in the subcooling heat exchanger 251.
  • This evaporating refrigerant exchanges heat with the refrigerant introduced to the indoor unit 300 from the receiver tank 241 via the subcooling heat exchanger 251, and then removes the evaporation heat. Thereby the refrigerant introduced to the indoor unit 300 from the receiver tank 241 via the subcooling heat exchanger 251 is subcooled.
  • the refrigerant introduced to the subcooling heat exchanger 251 from the receiver tank 241 via the subcooling-side expansion valve 252 evaporates in the subcooling heat exchanger 251 and becomes a gas. After that, the refrigerant is introduced to the compressor 211 via the accumulator 212 and then compressed.
  • the subcooling heat exchanger 251 and the subcooling-side expansion valve 252 are not essential for the air conditioning system main body 100.
  • the air conditioning system main body 100 may not include the subcooling heat exchanger 251 and the subcooling-side expansion valve 252.
  • the refrigerant introduced to the indoor unit 300 is decompressed by the indoor unit-side expansion valve 312 and then introduced to the indoor heat exchanger 311.
  • the refrigerant introduced to the indoor heat exchanger 311 absorbs heat by a heat exchange with inside air and then evaporates. This heat absorption cools the inside air.
  • the refrigerant that has become a gas by the evaporation is introduced to the compressor 211 via the four-way valve 221 and the accumulator 212 and then compressed.
  • the accumulator 212 separates the refrigerant introduced to the accumulator 212 itself into a refrigerant fluid and a refrigerant gas, and introduces only the refrigerant gas to the compressor 211. This aims to prevent reduced capability or malfunction of the compressor 211 due to the refrigerant fluid being introduced to the compressor 211.
  • the high-pressure-side pressure sensor 291 is disposed on a piping between the four-way valve 221 and the outdoor heat exchanger 231, and measures a pressure of the refrigerant in the piping.
  • the high-pressure-side pressure sensor 291 measures a pressure of a high-pressure refrigerant gas compressed in the compressor 211 and then introduced to the outdoor heat exchanger 231 via the four-way valve 221.
  • the information acquisition unit 491 calculates a pressure saturation temperature of the outdoor heat exchanger 231.
  • the outdoor heat exchanger outlet temperature sensor 292 is disposed at an outlet of the outdoor heat exchanger 231, and measures a temperature of the refrigerant flowing out from the outdoor heat exchanger 231.
  • the control device 400 controls the air conditioning system main body 100 to regulate a room temperature.
  • the control device 400 corresponds to an example of the refrigerant amount determination device and determines whether or not an amount of the refrigerant in the air conditioning system 1 is appropriate.
  • the refrigerant amount in the air conditioning system 1 is an amount of the refrigerant charged in the air conditioning system 1.
  • the refrigerant amount in the air conditioning system 1 is also referred to as a refrigerant amount in the air conditioning system main body 100.
  • the control device 400 is configured with a computer such as a microcomputer.
  • the installation position of the control device 400 is not limited to a specific position.
  • the control device 400 may be installed inside of the outdoor unit 200 or inside of the indoor unit 300.
  • the control device 400 may be included in a separate device from the outdoor unit 200 and the indoor unit 300.
  • the refrigerant amount determination device may be included in a separate device from the control device 400.
  • FIG. 3 is an outline block diagram illustrating a functional configuration of the control device 400.
  • the control device 400 includes a communication unit 410, an operation input unit 420, a display unit 430, a storage unit 480, and a control unit 490.
  • the control unit 490 includes an information acquisition unit 491, a subcooling level regulation unit 492, and a refrigerant amount determination unit 493.
  • the communication unit 410 communicates with other equipment.
  • the communication unit 410 receives a sensor signal indicating a measured pressure value by the high-pressure-side pressure sensor 291, and a sensor signal indicating a measured temperature value by the outdoor heat exchanger outlet temperature sensor 292.
  • the communication unit 410 transmits control signals for each part of the air conditioning system main body 100.
  • the operation input unit 420 includes an input device such as a press button, and receives a user operation.
  • the whole or part of the operation input unit 420 may be disposed on a remote controller.
  • the display unit 430 includes a display device such as a liquid crystal panel or lamp, or combination thereof, and displays various information. In particular, the display unit 430 displays determination results of whether or not a refrigerant amount is appropriate. For example, the display unit 430 includes a refrigerant amount excessive alarm lamp indicating that the refrigerant amount is excessive and a refrigerant amount insufficient lamp indicating that the refrigerant amount is insufficient. If the refrigerant amount determination unit 493 determines that the refrigerant amount is excessive, the display unit 430 lights up the refrigerant amount excessive alarm lamp. In addition, if the refrigerant amount determination unit 493 determines that the refrigerant amount is insufficient, the display unit 430 lights up the refrigerant amount insufficient alarm lamp.
  • the whole or part of the display unit 430 may be disposed on a remote controller.
  • the storage unit 480 stores various information.
  • the storage unit 480 is configured with a storage unit included in the control device 400.
  • the control unit 490 controls each part of the control device 400 to execute various processing.
  • the control unit 490 is configured by reading the program from the storage unit 480 and executing the program by a central processing unit (CPU) included in the control device 400.
  • CPU central processing unit
  • the information acquisition unit 491 acquires expansion valve opening-degree information indicating a degree of opening of an expansion valve subject to determination.
  • the expansion valve subject to determination here refers to either one or both of the subcooling-side expansion valve 252 and the indoor unit-side expansion valve 312.
  • the subcooling-side expansion valve 252 corresponds to an expansion valve on the subcooling heat exchanger 251 side.
  • the indoor unit-side expansion valve 312 corresponds to an expansion valve of the indoor unit 300.
  • the indoor unit-side expansion valve 312 of all the indoor units 300 may be used as the expansion valve subject to determination, or the indoor unit-side expansion valve 312 of some of the indoor units 300 may be used as the expansion valve subject to determination.
  • the information acquisition unit 491 may acquire a command value for a degree of opening of the expansion valve subject to determination as the expansion valve opening-degree information. Furthermore, the information acquisition unit 491 may acquire a measured value for the degree of opening of the expansion valve subject to determination as the expansion valve opening-degree information.
  • the subcooling level regulation unit 492 increases a subcooling level of the outdoor heat exchanger 231.
  • the subcooling level of the outdoor heat exchanger 231 here is indicated by a difference in temperature between an outlet temperature of the outdoor heat exchanger 231 and a pressure saturation temperature of the outdoor heat exchanger 231. It is considered that an amount of the refrigerant fluid accumulated in the outdoor heat exchanger 231 increases as the size of the outdoor heat exchanger 231 increases.
  • the subcooling level regulation unit 492 increases the subcooling level by reducing the degree of opening of the outdoor-side expansion valve 232.
  • the outdoor unit 200 may include a flow rate regulating valve for regulating the subcooling level in addition to the outdoor-side expansion valve 232 and the subcooling level regulation unit 492 may control a degree of opening of this flow rate regulating valve.
  • the refrigerant amount determination unit 493 determines whether or not a refrigerant amount in the air conditioning system 1 is appropriate. Specifically, the refrigerant amount determination unit 493 determines based on the degree of opening of the expansion valve subject to determination before the subcooling level regulation unit 492 increases the subcooling level and the subcooling level of the outdoor heat exchanger 231, and the degree of opening of the expansion valve subject to determination after the subcooling level regulation unit 492 increased the subcooling level.
  • the subcooling level regulation unit 492 may determine, without using information of the subcooling level of the outdoor heat exchanger 231, based on the degree of opening of the expansion valve subject to determination before the subcooling level regulation unit 492 increases the subcooling level, and the degree of opening of the expansion valve subject to determination after the subcooling level regulation unit 492 increased the subcooling level.
  • the refrigerant amount determination unit 493 may determine by using the mean value of the degree of opening of these plurality of valves, or the mode (most frequent value) thereof. Alternatively, the refrigerant amount determination unit 493 may determine based on majority rule whether or not the degree of opening of these plurality of valves each exceed the threshold value.
  • FIG. 4 is a diagram illustrating an example criterion used when the refrigerant amount determination unit 493 determines whether or not a refrigerant amount is appropriate based on data at two subcooling levels.
  • the refrigerant amount determination unit 493 determines the amount of the refrigerant charged in the air conditioning system main body 100 is appropriate, excessive, or insufficient based on abnormality determination results each for a normal state and after increase of the subcooling level.
  • the storage unit 480 preliminarily stores the criterion information indicating the criterion.
  • the refrigerant amount determination unit 493 uses the criterion information to perform determination.
  • the normal state here refers to the state before the subcooling level regulation unit 492 increases the subcooling level of the outdoor heat exchanger 231.
  • the normal state here is the state in which the control to close the outdoor-side expansion valve 232 to increase the subcooling level of the outdoor heat exchanger 231 is not performed.
  • Closing the valve refers to reducing the degree of opening of the valve.
  • the refrigerant amount determination unit 493 determines, in individual abnormality determinations, on either one of determination results of expansion valve opening-degree large, subcooling level large, or abnormality undetected.
  • the expansion valve opening-degree large indicates that the degree of opening of the expansion valve subject to determination is larger than a predetermined threshold value. This expansion valve opening-degree large indicates that the refrigerant in the receiver tank 241 is insufficient.
  • the control unit 490 increases the degree of opening of the indoor unit-side expansion valve 312 to increase the refrigerant flowing through the indoor heat exchanger 311.
  • the control unit 490 increases the degree of opening of the subcooling-side expansion valve 252 in preparation for increase of the refrigerant flowing from one outdoor unit 200 to another outdoor unit 200.
  • the control unit 490 further increases the degree of opening of the indoor unit-side expansion valve 312 and the degree of opening of the subcooling-side expansion valve 252.
  • the control unit 490 increases the degree of opening of the indoor unit-side expansion valve 312 and the degree of opening of the subcooling-side expansion valve 252 more and more.
  • the degree of opening of the expansion valve subject to determination becomes larger than the threshold value.
  • the expansion valve subject to determination refers to either one or both of the indoor unit-side expansion valve 312 and the subcooling-side expansion valve 252.
  • the subcooling level large indicates that the subcooling level of the outdoor heat exchanger 231 is larger than the predetermined threshold value. This subcooling level large indicates that the refrigerant is overflowing from the receiver tank 241. Overflowing of the refrigerant from the receiver tank 241 here refers to the receiver tank 241 being full and impossible to fully house the refrigerant. If the refrigerant overflows from the receiver tank 241, the overflown refrigerant accumulates in the outdoor heat exchanger 231, thereby increasing the subcooling level of the outdoor heat exchanger 231. The receiver tank 241 determines, if the subcooling level of the outdoor heat exchanger 231 increases and becomes larger than the threshold value, the subcooling level large.
  • the abnormality undetected indicates that none of the expansion valve opening-degree large and the subcooling level large is detected.
  • the refrigerant amount determination unit 493 determines the abnormality undetected in the abnormality determination in the normal state, and determines the expansion valve opening-degree large in the abnormality determination after increasing the subcooling level, the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is appropriate.
  • the abnormality determination result after increasing the subcooling level in this case indicates that, in the state in which the refrigerant is intentionally accumulated in the outdoor heat exchanger 231, the refrigerant in the receiver tank 241 is insufficient. From this result, in the normal state in which the refrigerant is not accumulated intentionally in the outdoor heat exchanger 231, even though the refrigerant amount in the receiver tank 241 changes due to any environmental change or the like, it is expected that the refrigerant does not overflow from the receiver tank 241. To acquire appropriate determination results in this case, an increasing amount of the subcooling level increased by the subcooling level regulation unit 492 can be preliminarily regulated.
  • the refrigerant amount determination unit 493 determines the abnormality undetected or the subcooling level large in the abnormality determination in the normal state, and determines the abnormality undetected in the abnormality determination after increasing the subcooling level, the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is excessive.
  • the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is excessive.
  • the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is excessive.
  • the refrigerant amount determination unit 493 determines the expansion valve opening-degree large in the abnormality determination in the normal state, and determines the expansion valve opening-degree large in the abnormality determination after increasing the subcooling level, the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is excessive.
  • the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is insufficient.
  • the refrigerant amount determination unit 493 may determine whether or not the refrigerant amount is appropriate based on the processing illustrated in FIG. 5 .
  • FIG. 5 is a flowchart illustrating an example procedure in which the control device 400 determines whether or not the refrigerant amount is appropriate based on data at two subcooling levels.
  • the control unit 490 sets an operation mode of the air conditioning system main body 100 to a normal operation mode in the cooling cycle. Based on this setting, the control unit 490 controls the air conditioning system main body 100 to operate in the cooling cycle and in the normal state.
  • the normal state is the state in which the control to close the outdoor-side expansion valve 232 to increase the subcooling level of the outdoor heat exchanger 231 is not performed.
  • step S101 the processing proceeds to step S102.
  • the refrigerant amount determination unit 493 performs abnormality determination.
  • the abnormality determination here corresponds to an abnormality determination in the normal state.
  • step S102 abnormality undetected
  • step S102 abnormality undetected
  • step S102 subcooling level large
  • step S131 If the expansion valve opening-degree large is determined (step S102: expansion valve opening-degree large), the processing proceeds to step S141.
  • the subcooling level regulation unit 492 increases the subcooling level of the outdoor heat exchanger 231 by closing the outdoor-side expansion valve 232.
  • step Sill the processing proceeds to step S112.
  • the refrigerant amount determination unit 493 performs abnormality determination.
  • the abnormality determination here corresponds to an abnormality determination after increasing the subcooling level.
  • step S121 expansion valve opening-degree large
  • step S121 expansion valve opening-degree large
  • step S121 abnormality undetected or the subcooling level large
  • the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is appropriate.
  • step S121 the control device 400 ends the processing illustrated in FIG. 5 .
  • the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is excessive.
  • step S131 the control device 400 ends the processing illustrated in FIG. 5 .
  • the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is insufficient.
  • step S141 the control device 400 ends the processing illustrated in FIG. 5 .
  • FIG. 6 is a flowchart illustrating an example procedure in which the control device 400 increases the subcooling level of the outdoor heat exchanger 231.
  • the control device 400 performs the processing illustrated in FIG. 6 in step Sill in FIG. 5 .
  • the information acquisition unit 491 acquires outdoor heat exchanger outlet temperature information from the outdoor heat exchanger outlet temperature sensor 292 via the communication unit 410.
  • the outdoor heat exchanger outlet temperature information is the information indicating a measured temperature value of the outdoor heat exchanger outlet temperature sensor 292.
  • the outdoor heat exchanger outlet temperature information indicates an outlet temperature of the outdoor heat exchanger 231 in the cooling cycle.
  • step S201 the processing proceeds to step S202.
  • the information acquisition unit 491 acquires outdoor heat exchanger pressure saturation temperature information from the high-pressure-side pressure sensor 291 via the communication unit 410.
  • the outdoor heat exchanger pressure saturation temperature information is the information calculated from the measured pressure value of the high-pressure-side pressure sensor 291. This outdoor heat exchanger pressure saturation temperature information indicates the pressure saturation temperature in the outdoor heat exchanger 231.
  • step S202 the processing proceeds to step S203.
  • the information acquisition unit 491 calculates the subcooling level of the outdoor heat exchanger 231. Specifically, the refrigerant amount determination unit 493 calculates a difference between the outlet temperature of the outdoor heat exchanger 231 indicated by the outdoor heat exchanger outlet temperature information and the pressure saturation temperature indicated by the outdoor heat exchanger pressure saturation temperature information.
  • step S203 the processing proceeds to step S204.
  • the subcooling level regulation unit 492 sets a control target value for controlling the degree of opening of the outdoor-side expansion valve 232 based on the subcooling level acquired in step S203. For example, the subcooling level regulation unit 492 sets a target value for increasing the subcooling level of the outdoor heat exchanger 231 by a predetermined temperature.
  • step S204 the processing proceeds to step S205.
  • the subcooling level regulation unit 492 controls to reduce the degree of opening of the outdoor-side expansion valve 232.
  • the subcooling level regulation unit 492 reduces the degree of opening of the outdoor-side expansion valve 232 by a predetermined degree of opening.
  • step S205 the processing proceeds to step S206.
  • the subcooling level regulation unit 492 determines whether or not the target value set in step S204 is reached.
  • step S206 NO
  • step S206: YES the control device 400 ends the processing illustrated in FIG. 6 .
  • the refrigerant amount determination unit 493 may determine whether or not the refrigerant amount is appropriate based on data at three or more subcooling levels.
  • FIG. 7 is a diagram illustrating an example criterion used when the refrigerant amount determination unit 493 determines whether or not the refrigerant amount is appropriate based on data at the three subcooling levels.
  • the refrigerant amount determination unit 493 determines the amount of the refrigerant charged in the air conditioning system main body 100 is appropriate, excessive, or insufficient based on abnormality determination results for a first subcooling level, a second subcooling level, and a third subcooling level.
  • the first subcooling level is the subcooling level in the normal state. Accordingly, the first subcooling level is the subcooling level in a state in which the control to close the outdoor-side expansion valve 232 to increase the subcooling level of the outdoor heat exchanger 231 is not performed.
  • the second subcooling level is the subcooling level larger than the first subcooling level.
  • the third subcooling level is the subcooling level larger than the second subcooling level.
  • the subcooling level regulation unit 492 changes the subcooling level of the outdoor heat exchanger 231 to the first subcooling level, the second subcooling level, and the third subcooling level, respectively.
  • the refrigerant amount determination unit 493 determines whether or not the refrigerant amount in the air conditioning system 1 is appropriate based on the degree of opening of the expansion valve subject to determination and the subcooling level of the outdoor heat exchanger 231 each for the first subcooling level, the second subcooling level, and the third subcooling level.
  • the subcooling level regulation unit 492 may determine whether or not the refrigerant amount in the air conditioning system 1 is appropriate based on only the degree of opening of the expansion valve subject to determination. In other words, the subcooling level regulation unit 492 may determine without using the information of the subcooling level of the outdoor heat exchanger 231.
  • the example of FIG. 7 differs from the example of FIG. 4 in that the subcooling level regulation unit 492 changes the subcooling level of the outdoor heat exchanger 231 to the three levels, and that the refrigerant amount determination unit 493 determines by using the criterion illustrated in FIG. 7 instead of using the criterion illustrated in FIG. 4 .
  • Others are the same as the example of FIG. 4 .
  • the refrigerant amount determination unit 493 determines the abnormality undetected in the abnormality determination at the first subcooling level, determines the abnormality undetected in the abnormality determination at the second subcooling level, and determines the expansion valve opening-degree large in the abnormality determination at the third subcooling level, the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is appropriate.
  • the refrigerant amount determination unit 493 determines the abnormality undetected or the subcooling level large in the abnormality determination at the first subcooling level, determines the abnormality undetected or the subcooling level large in the abnormality determination at the second subcooling level, and determines the abnormality undetected in the abnormality determination at the third subcooling level, the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is excessive.
  • the refrigerant amount determination unit 493 determines the abnormality undetected or the expansion valve opening-degree large in the abnormality determination at the first subcooling level, determines the expansion valve opening-degree large in the abnormality determination at the second subcooling level, and determines the expansion valve opening-degree large in the abnormality determination at the third subcooling level, the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is insufficient.
  • the refrigerant amount determination unit 493 determines the subcooling level large in the abnormality determination at the first subcooling level, the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is excessive in the same manner as described in the example in FIG. 4 .
  • the refrigerant amount determination unit 493 determines the expansion valve opening-degree large in the abnormality determination at the first subcooling level, the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is insufficient in the same manner as described in the example in FIG. 4 .
  • the second subcooling level is the subcooling level set to distinguish, in particular, between the state in which the refrigerant amount is appropriate and the state in which the refrigerant amount is insufficient.
  • the second subcooling level is set to a subcooling level smaller than the subcooling level after being increased as illustrated in the example in FIG. 4 .
  • the refrigerant amount determination unit 493 determines the expansion valve opening-degree large in the abnormality determination at the second subcooling level, the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is insufficient in the same manner as the refrigerant amount determination unit 493 determined the expansion valve opening-degree large in the abnormality determination at the first subcooling level.
  • the third subcooling level is the subcooling level set to distinguish, in particular, between the state in which the refrigerant amount is appropriate and the state in which the refrigerant amount is excessive.
  • the third subcooling level is set to a subcooling level equal to the subcooling level after being increased as illustrated in the example in FIG. 4 .
  • the refrigerant amount determination unit 493 determines the abnormality undetected in the abnormality determination at the third subcooling level, the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is excessive in the same manner as described in the example in FIG. 4 .
  • the refrigerant amount determination unit 493 may determine whether or not the refrigerant amount is appropriate based on the processing illustrated in FIG. 8 .
  • FIG. 8 is a flowchart illustrating an example procedure in which the control device 400 determines whether or not the refrigerant amount is appropriate based on data at three subcooling levels.
  • Steps S301 to S302 are the same as steps S101 to S102 illustrated in FIG. 5 .
  • the abnormality determination in step S301 corresponds to the abnormality determination at the first subcooling level.
  • step S302 abnormality undetected
  • step S311 If the abnormality undetected is determined in step S302 (step S302: abnormality undetected), the processing proceeds to step S311. If the subcooling level large is determined (step S302: subcooling level large), the processing proceeds to step S341. If the expansion valve opening-degree large is determined (step S302: expansion valve opening-degree large), the processing proceeds to step S351.
  • the subcooling level regulation unit 492 increases the subcooling level of the outdoor heat exchanger 231 by closing the outdoor-side expansion valve 232.
  • the control device 400 performs the processing in step S311 illustrated in FIG. 6 , whereby the subcooling level regulation unit 492 increases the subcooling level of the outdoor heat exchanger 231.
  • step S311 the subcooling level regulation unit 492 sets the subcooling level of the outdoor heat exchanger 231 to the second subcooling level.
  • step S311 the processing proceeds to step S312.
  • the refrigerant amount determination unit 493 performs abnormality determination.
  • the abnormality determination here corresponds to the abnormality determination at the second subcooling level.
  • step S312 abnormality undetected
  • step S312 abnormality undetected
  • step S312 subcooling level large
  • step S341 If the expansion valve opening-degree large is determined (step S312: expansion valve opening-degree large), the processing proceeds to step S351.
  • the subcooling level regulation unit 492 increases the subcooling level of the outdoor heat exchanger 231 by closing the outdoor-side expansion valve 232.
  • the control device 400 performs the processing illustrated in FIG. 6 in step S321, whereby the subcooling level regulation unit 492 increases the subcooling level of the outdoor heat exchanger 231.
  • the subcooling level regulation unit 492 sets the subcooling level of the outdoor heat exchanger 231 to the third subcooling level.
  • step S321 the processing proceeds to step S322.
  • the refrigerant amount determination unit 493 performs abnormality determination.
  • the abnormality determination here corresponds to the abnormality determination at the third subcooling level.
  • step S322 expansion valve opening-degree large
  • step S331 If either the abnormality undetected is determined or the subcooling level large is determined (step S322: abnormality undetected or subcooling level large), the processing proceeds to step S341.
  • the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is appropriate.
  • step S331 the control device 400 ends the processing illustrated in FIG. 8 .
  • the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is excessive.
  • step S341 the control device 400 ends the processing illustrated in FIG. 8 .
  • the refrigerant amount determination unit 493 determines that the amount of the refrigerant charged in the air conditioning system main body 100 is insufficient.
  • step S351 the control device 400 ends the processing illustrated in FIG. 8 .
  • the subcooling level regulation unit 492 increases the subcooling level of the outdoor heat exchanger 231.
  • the refrigerant amount determination unit 493 determines whether or not the refrigerant amount in the air conditioning system 1 is appropriate based on the degree of opening of the expansion valve subject to determination before increasing the subcooling level and the degree of opening of the expansion valve subject to determination after increasing the subcooling level.
  • control device 400 determines whether or not the refrigerant amount in the air conditioning system 1 is appropriate based on only the information in a state in which the subcooling level of the outdoor heat exchanger 231 is not increased, it is impossible to determine how much amount of the refrigerant can be housed by the receiver tank 241 additionally.
  • the control device 400 When the control device 400 increases the subcooling level of the outdoor heat exchanger 231, the refrigerant is accumulated intentionally in the outdoor heat exchanger 231, and thus the refrigerant amount in the receiver tank 241 can be reduced. If the determination is performed in this state, the control device 400 can determine whether or not a sufficient amount of the refrigerant can be housed by the receiver tank 241 additionally in a state in which the subcooling level of the outdoor heat exchanger 231 is not increased. Therefore, the control device 400 can determine the possibility of the refrigerant overflowing from the receiver tank 241 when the refrigerant amount in the receiver tank 241 increases due to any environmental change or the like.
  • control device 400 can determine whether or not the refrigerant amount in the air conditioning system 1 is appropriate with higher accuracy in comparison with determining based on only the information in a state in which the subcooling level of the outdoor heat exchanger 231 is not increased.
  • the subcooling level regulation unit 492 is capable of increasing the subcooling level of the outdoor heat exchanger 231 by reducing the degree of opening of the outdoor-side expansion valve 232.
  • the refrigerant amount determination unit 493 determines whether or not the refrigerant amount in the air conditioning system 1 is appropriate based on the subcooling level of the outdoor heat exchanger 231 before increasing the subcooling level in addition to the degree of opening of the expansion valve subject to determination.
  • This determination enables the refrigerant amount determination unit 493 to determine whether or not the refrigerant amount in the air conditioning system 1 is insufficient.
  • the subcooling level regulation unit 492 changes the subcooling level of the outdoor heat exchanger 231 to the first subcooling level, the second subcooling level, and the third subcooling level, respectively.
  • the refrigerant amount determination unit 493 determines whether or not the refrigerant amount in the air conditioning system 1 is appropriate based on the degree of opening of the expansion valve subject to determination each for the first subcooling level, the second subcooling level, and the third subcooling level.
  • the refrigerant amount determination unit 493 can determine whether or not the refrigerant amount is sufficient by using information at the second subcooling level. Accordingly, the refrigerant amount determination unit 493 can determine whether or not the refrigerant amount in the air conditioning system 1 is insufficient.
  • the refrigerant amount determination unit 493 can determine whether or not a sufficient amount of the refrigerant can be housed by the receiver tank 241 additionally in a state in which the subcooling level of the outdoor heat exchanger 231 is not increased as described above.
  • control device 400 achieves determination of whether or not the refrigerant amount in the air conditioning system 1 is appropriate with still higher accuracy.
  • a program for implementing the whole or part of functions of the control unit 490 is recorded in a computer readable recording medium, and a computer system is caused to read and execute the program that is recorded in the recording medium to execute various processes.
  • the "computer system” here includes hardware such as an operating system (OS) and peripheral equipment.
  • OS operating system
  • WWW world wide web
  • the "computer system” also includes a home page providing environment (or a display environment).
  • the "computer readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a read only memory (ROM), and a compact disc read-only memory (CD-ROM), or a storage device such as a hard disk built in a computer system.
  • the above-described program may implement part of the functions as described above, and furthermore, also implement the functions as described above in combination with a program already recorded on the computer system.
  • the embodiment of the present invention relates to a refrigerant amount determination device that includes an information acquisition unit, a subcooling level regulation unit, and a refrigerant amount determination unit.
  • the information acquisition unit acquires expansion valve opening-degree information that indicates a degree of opening of an expansion valve subject to determination, the expansion valve being at least either one of an expansion valve in an indoor unit and an expansion valve on a side of a subcooling heat exchanger included in an air conditioning system.
  • the subcooling level regulation unit increases a subcooling level of an outdoor heat exchanger included in the air conditioning system.
  • the refrigerant amount determination unit determines whether or not the refrigerant amount in the air conditioning system is appropriate based on the degree of opening of the expansion valve subject to determination before increasing the subcooling level and the degree of opening of the expansion valve subject to determination after increasing the subcooling level.
  • determining whether or not the refrigerant amount in the air conditioning system is appropriate is achieved with higher accuracy.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
EP18761976.2A 2017-02-28 2018-01-31 Dispositif de détermination de charge de réfrigérant, système de climatisation, procédé de détermination de charge de réfrigérant et programme Withdrawn EP3561413A1 (fr)

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JP2017036852A JP2018141607A (ja) 2017-02-28 2017-02-28 冷媒量判定装置、空気調和システム、冷媒量判定方法およびプログラム
PCT/JP2018/003151 WO2018159202A1 (fr) 2017-02-28 2018-01-31 Dispositif de détermination de charge de réfrigérant, système de climatisation, procédé de détermination de charge de réfrigérant et programme

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JP7209585B2 (ja) * 2019-05-29 2023-01-20 三菱電機株式会社 冷暖房装置および冷暖房装置の制御方法
JP7397286B2 (ja) * 2019-09-30 2023-12-13 ダイキン工業株式会社 冷凍サイクル装置
CN113883690B (zh) * 2021-10-25 2023-03-14 青岛海信日立空调系统有限公司 空气调节装置
CN114413429B (zh) * 2022-01-26 2023-05-30 青岛海信日立空调系统有限公司 空调系统
JP2024043621A (ja) * 2022-09-20 2024-04-02 ダイキン工業株式会社 熱源ユニット、および冷凍装置
CN117469865A (zh) * 2023-12-21 2024-01-30 北京环都拓普空调有限公司 一种可自动判定制冷剂充注量的直膨机及方法

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JP4071388B2 (ja) * 1999-03-17 2008-04-02 三菱電機株式会社 マルチ形冷凍サイクル装置の制御方法および制御装置
JP2002257427A (ja) * 2001-02-28 2002-09-11 Mitsubishi Electric Corp 冷凍空調装置、及びその運転方法
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JP5210510B2 (ja) * 2006-10-13 2013-06-12 三菱重工業株式会社 マルチ空調システムの冷媒封入量判定方法および冷媒漏洩検知方法
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