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WO2018159202A1 - 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
WO2018159202A1
WO2018159202A1 PCT/JP2018/003151 JP2018003151W WO2018159202A1 WO 2018159202 A1 WO2018159202 A1 WO 2018159202A1 JP 2018003151 W JP2018003151 W JP 2018003151W WO 2018159202 A1 WO2018159202 A1 WO 2018159202A1
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WO
WIPO (PCT)
Prior art keywords
degree
supercooling
expansion valve
refrigerant
conditioning system
Prior art date
Application number
PCT/JP2018/003151
Other languages
English (en)
Japanese (ja)
Inventor
隆博 加藤
大輔 杉本
Original Assignee
三菱重工サーマルシステムズ株式会社
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 三菱重工サーマルシステムズ株式会社 filed Critical 三菱重工サーマルシステムズ株式会社
Priority to CN201880008170.0A priority Critical patent/CN110199163A/zh
Priority to EP18761976.2A priority patent/EP3561413A1/fr
Publication of WO2018159202A1 publication Critical patent/WO2018159202A1/fr

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00Compression machines, plants or systems, with reversible cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B40/00Subcoolers, desuperheaters or superheaters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031Sensor arrangements
    • F25B2313/0313Pressure sensors near the outdoor heat exchanger
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00General 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
    • F25B2400/13Economisers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2513Expansion valves

Definitions

  • the present invention relates to a refrigerant amount determination device, an air conditioning system, a refrigerant amount determination method, and a program.
  • This application claims priority based on Japanese Patent Application No. 2017-36852 for which it applied to Japan on February 28, 2017, and uses the content here.
  • Patent Document 1 discloses a refrigerant filling amount determination method.
  • the refrigerant filling amount determination method described in Patent Document 1 when the air conditioning system is operated in a cooling cycle, and the opening degree of one or both of the indoor expansion valve and the subcooling expansion valve is equal to or greater than a predetermined value. Further, it is determined that the refrigerant filling amount is in a gas low state.
  • the refrigerant filling amount determination method described in Patent Literature 1 it is possible to detect the gas low state of the air conditioning system.
  • the air conditioning system can be efficiently operated by increasing the amount of refrigerant in the air conditioning system. It is further preferable if it can be determined with higher accuracy whether or not the refrigerant amount of the air conditioning system is appropriate.
  • the present invention provides a refrigerant amount determination device, an air conditioning system, a refrigerant amount determination method, and a program capable of determining with high accuracy whether or not the refrigerant amount of an air conditioning system is appropriate.
  • the refrigerant amount determination device is an opening degree of the determination target expansion valve that is at least one of the expansion valve of the indoor unit and the expansion valve on the supercooling heat exchanger side provided in the air conditioning system.
  • An information acquisition unit that acquires expansion valve opening information indicating the degree of supercooling, an overcooling degree adjustment unit that increases the degree of subcooling of the outdoor heat exchanger included in the air conditioning system, and the determination before increasing the degree of supercooling
  • a refrigerant amount determination unit that determines whether or not the refrigerant amount of the air conditioning system is appropriate based on the opening of the target expansion valve and the opening of the determination target expansion valve after increasing the degree of supercooling And comprising.
  • the supercooling degree adjusting unit may increase the supercooling degree by reducing an opening degree of an expansion valve on an outdoor heat exchanger side included in the air conditioning system.
  • the refrigerant amount determination unit further determines whether or not the refrigerant amount of the air conditioning system is appropriate based on the subcooling degree before the supercooling degree adjustment unit increases the supercooling degree. Also good.
  • the supercooling degree adjustment unit sets the supercooling degree to a first supercooling degree, a second supercooling degree larger than the first supercooling degree, and a third supercooling degree larger than the second supercooling degree.
  • the refrigerant amount determination unit is configured to change the air conditioning based on the opening degree of the determination target expansion valve in each of the first subcooling degree, the second subcooling degree, and the third subcooling degree. You may make it determine whether the refrigerant
  • the air conditioning system includes any one of the refrigerant amount determination devices described above.
  • the refrigerant amount determination method includes the steps of increasing the degree of supercooling of the outdoor heat exchanger provided in the air conditioning system, and the air conditioning system before increasing the degree of supercooling.
  • the opening degree of the determination target expansion valve that is at least one of the expansion valve of the indoor unit provided or the expansion valve on the supercooling heat exchanger side, and the opening degree of the determination target expansion valve after increasing the degree of supercooling And determining whether or not the amount of refrigerant in the air conditioning system is appropriate.
  • the program causes the computer that controls the air conditioning system to increase the degree of supercooling of the outdoor heat exchanger included in the air conditioning system, and before increasing the degree of supercooling.
  • the indoor unit provided in the air conditioning system or the opening of the determination target expansion valve which is at least one of the expansion valve on the supercooling heat exchanger side and the determination target after increasing the degree of supercooling
  • the refrigerant amount determination device According to the refrigerant amount determination device, the air conditioning system, the refrigerant amount determination method, and the program described above, it can be determined with higher accuracy whether or not the refrigerant amount of the air conditioning system is appropriate.
  • FIG. 1 is a schematic block diagram illustrating a functional configuration of an air conditioning system according to an embodiment.
  • the 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 the control of the control device 400 and adjusts the indoor air temperature that is a temperature adjustment target.
  • the object on which the air conditioning system main body 100 performs temperature adjustment is not limited to the room.
  • the air conditioning system main body 100 such as outdoor spot air conditioning, may adjust the air temperature in the outdoor space.
  • FIG. 2 is a schematic configuration diagram illustrating an example of 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 expansion valve 232, a receiver tank 241, a supercooling heat exchanger 251, and a supercooling side expansion.
  • a valve 252, a high pressure side pressure sensor 291, and an outdoor heat exchanger outlet temperature sensor 292 are provided.
  • the indoor unit 300 includes an indoor heat exchanger 311 and an indoor unit side expansion valve 312.
  • FIG. 2 shows an example where the air conditioning system main body 100 includes a plurality of indoor units 300
  • the number of indoor units 300 included in the air conditioning system main body 100 may be one or more.
  • the number of outdoor units 200 included in the air conditioning system main body 100 may be one or more.
  • the installation location of the compressor 211, the accumulator 212, the four-way valve 221, the receiver tank 241, the supercooling heat exchanger 251, and the supercooling side expansion valve 252 is not limited to the outdoor unit 200.
  • some or all of the compressor 211, the accumulator 212, the four-way valve 221, the receiver tank 241, the supercooling heat exchanger 251, and the supercooling side expansion valve 252 are configured as a device separate from the outdoor unit 200.
  • the air conditioning system 1 may be a system dedicated to cooling. In the example of FIG. 2, switching between the cooling cycle and the heating cycle is performed by switching the four-way valve 221.
  • the gaseous refrigerant compressed by the compressor 211 flows into the outdoor heat exchanger 231 via the four-way valve 221.
  • the gaseous refrigerant that has flowed into the outdoor heat exchanger 231 dissipates heat and condenses through heat exchange with outdoor air.
  • the refrigerant that has become liquid by condensation flows into the receiver tank 241 via the outdoor expansion valve 232.
  • the receiver tank 241 stores a sufficient amount of refrigerant for coping with changes in operating conditions.
  • the refrigerant flowing out from the receiver tank 241 is supercooled by the supercooling heat exchanger 251 and then flows into the indoor unit 300.
  • the supercooling heat exchanger 251 performs supercooling of the refrigerant in order to prevent the refrigerant from evaporating in the pipe between the outdoor unit 200 and the indoor unit 300.
  • a part of the liquid refrigerant flowing out of the receiver tank 241 is decompressed by the supercooling side expansion valve 252, then flows into the supercooling heat exchanger 251, and evaporates in the supercooling heat exchanger 251.
  • This evaporating refrigerant exchanges heat with the refrigerant flowing into the indoor unit 300 from the receiver tank 241 via the supercooling heat exchanger 251 and takes heat of evaporation.
  • the refrigerant flowing into the indoor unit 300 from the receiver tank 241 via the supercooling heat exchanger 251 is supercooled.
  • the refrigerant flowing into the supercooling heat exchanger 251 from the receiver tank 241 via the supercooling side expansion valve 252 evaporates in the supercooling heat exchanger 251 to become a gas, and then passes through the accumulator 212 to become a compressor. It flows into 211 and is compressed.
  • the supercooling heat exchanger 251 and the supercooling side expansion valve 252 are not essential to the air conditioning system main body 100.
  • the air conditioning system main body 100 includes the supercooling heat exchanger 251 and the supercooling side expansion valve. 252 may not be provided.
  • the refrigerant flowing into the indoor unit 300 is decompressed by the indoor unit side expansion valve 312 and then flows into the indoor heat exchanger 311.
  • the refrigerant flowing into the indoor heat exchanger 311 absorbs heat and evaporates by heat exchange with the indoor air.
  • the indoor air is cooled by this heat absorption.
  • the refrigerant turned into gas by evaporation flows into the compressor 211 via the four-way valve 221 and the accumulator 212 and is compressed.
  • the accumulator 212 separates the refrigerant flowing into the accumulator 212 itself into a liquid refrigerant and a gaseous refrigerant, and allows only the gaseous refrigerant to flow into the compressor 211. This is to prevent the refrigerant 211 from flowing into the compressor 211 and the compressor 211 from being reduced in capacity or malfunctioning.
  • the high pressure side pressure sensor 291 is provided in a pipe between the four-way valve 221 and the outdoor heat exchanger 231 and measures the refrigerant pressure in the pipe. Particularly in the case of the cooling cycle, the high pressure side pressure sensor 291 measures the pressure of the refrigerant of high pressure gas that is compressed by the compressor 211 and flows into the outdoor heat exchanger 231 via the four-way valve 221. In this case, the information acquisition unit 491 calculates the pressure saturation temperature of the outdoor heat exchanger 231 based on the pressure measured by the high-pressure sensor 291.
  • the outdoor heat exchanger outlet temperature sensor 292 is provided at the outlet of the outdoor heat exchanger 231 and measures the temperature of the refrigerant flowing out of the outdoor heat exchanger 231.
  • the control device 400 controls the air conditioning system main body 100 to adjust the room temperature. Further, the control device 400 corresponds to an example of a refrigerant amount determination device, and determines whether or not the refrigerant amount of the air conditioning system 1 is appropriate.
  • the amount of refrigerant in the air conditioning system 1 is the amount of refrigerant sealed in the air conditioning system 1.
  • the refrigerant amount of the air conditioning system 1 is also referred to as the refrigerant amount of the air conditioning system main body 100.
  • the control device 400 is configured using a computer such as a microcomputer (Micro Computer), for example.
  • the installation position of the control device 400 is not limited to a specific position.
  • the control device 400 may be installed inside the outdoor unit 200, or may be installed inside the indoor unit 300.
  • the control apparatus 400 may be comprised as an apparatus different from the outdoor unit 200 and the indoor unit 300.
  • the refrigerant amount determination device may be configured as a device different from the control device 400.
  • FIG. 3 is a schematic 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 supercooling degree adjustment unit 492, and a refrigerant amount determination unit 493.
  • the communication unit 410 communicates with other devices.
  • the communication unit 410 receives a sensor signal indicating a pressure measurement value by the high-pressure sensor 291 and a sensor signal indicating a temperature measurement value by the outdoor heat exchanger outlet temperature sensor 292.
  • the communication part 410 transmits the control signal with respect to each part of the air conditioning system main body 100.
  • the operation input unit 420 includes an input device such as a push button and receives a user operation. All or part of the operation input unit 420 may be arranged in a remote controller.
  • the display unit 430 includes a display device such as a liquid crystal panel, a lamp, or a combination thereof, and displays various types of information. In particular, the display unit 430 displays a determination result as to whether or not the refrigerant amount is appropriate.
  • the display unit 430 includes an excessive refrigerant amount alarm lamp that indicates an excessive refrigerant amount and an excessive refrigerant amount lamp that indicates an excessive refrigerant amount.
  • the display unit 430 determines that the refrigerant amount is excessive, the display unit 430 turns on the excessive refrigerant amount alarm lamp.
  • the display unit 430 turns on the refrigerant amount under alarm lamp. All or part of the display unit 430 may be arranged on the remote controller.
  • the storage unit 480 stores various types of information.
  • the storage unit 480 is configured using a storage device provided in the control device 400.
  • the control unit 490 controls each unit of the control device 400 and executes various processes.
  • the control unit 490 is configured by, for example, a CPU (Central Processing Unit) included in the control device 400 reading out a program from the storage unit 480 and executing it.
  • a CPU Central Processing Unit
  • the information acquisition unit 491 acquires expansion valve opening information indicating the opening of the determination target expansion valve.
  • the determination target expansion valve here is one or both of the subcooling side expansion valve 252 and the indoor unit side expansion valve 312.
  • the supercooling side expansion valve 252 corresponds to an expansion valve on the supercooling heat exchanger 251 side.
  • the indoor unit side expansion valve 312 corresponds to the expansion valve of the indoor unit 300.
  • the indoor unit side expansion valves 312 of all the indoor units 300 are used as the determination target expansion valves.
  • the indoor unit side expansion valves 312 of some of the indoor units 300 may be used as the determination target expansion valve.
  • the information acquisition unit 491 may acquire the opening command value of the determination target expansion valve as the expansion valve opening information. Or you may make it the information acquisition part 491 acquire the opening degree measured value of a determination object expansion valve as expansion valve opening degree information.
  • the supercooling degree adjustment unit 492 increases the supercooling degree of the outdoor heat exchanger 231.
  • the degree of supercooling of the outdoor heat exchanger 231 here is indicated by a temperature difference between the outlet temperature of the outdoor heat exchanger 231 and the pressure saturation temperature of the outdoor heat exchanger 231. It is considered that the larger the outdoor heat exchanger 231 is, the more liquid refrigerant is accumulated in the outdoor heat exchanger 231.
  • the supercooling degree adjusting unit 492 increases the supercooling degree by reducing the opening degree of the outdoor expansion valve 232.
  • the outdoor unit 200 may include a flow rate adjustment valve for adjusting the degree of supercooling separately from the outdoor expansion valve 232, and the degree of supercooling degree adjustment unit 492 may control the opening degree of the flow rate adjustment valve.
  • the refrigerant amount determination unit 493 determines whether or not the refrigerant amount of the air conditioning system 1 is appropriate. Specifically, the refrigerant amount determination unit 493 adjusts the degree of opening of the determination target expansion valve and the degree of subcooling of the outdoor heat exchanger 231 before the subcooling degree adjustment unit 492 increases the degree of subcooling, and the degree of subcooling. The determination is performed based on the opening degree of the determination target expansion valve after the portion 492 increases the degree of supercooling. Alternatively, the supercooling degree adjustment unit 492 does not use the information on the degree of supercooling of the outdoor heat exchanger 231, and the opening degree and the supercooling of the determination target expansion valve before the supercooling degree adjustment unit 492 increases the supercooling degree.
  • the determination may be made based on the opening degree of the determination target expansion valve after the degree is increased.
  • the refrigerant amount determination unit 493 may perform determination using the average value of the opening degrees of the plurality of valves, or may use the mode value. You may make it perform determination. Or you may make it the refrigerant
  • FIG. 4 is a diagram illustrating an example of a determination criterion when the refrigerant amount determination unit 493 determines whether or not the refrigerant amount is appropriate based on data at two stages of supercooling degrees.
  • the refrigerant amount determination unit 493 determines whether the refrigerant amount enclosed in the air conditioning system main body 100 is appropriate, excessive, or insufficient based on the abnormality determination results in the normal state and after the degree of supercooling increases. It is determined whether it is.
  • the storage unit 480 stores determination criterion information indicating the determination criterion in advance.
  • coolant amount determination part 493 performs determination using this determination reference
  • the normal state here is a state before the supercooling degree adjusting unit 492 increases the supercooling degree of the outdoor heat exchanger 231. Therefore, the normal state here is a state in which control for restricting the outdoor expansion valve 232 is not performed in order to increase the degree of supercooling of the outdoor heat exchanger 231. To throttle the valve here means to reduce the opening of the valve.
  • the refrigerant amount determination unit 493 determines the determination result as one of expansion valve opening degree large, supercooling degree large, and abnormality non-detection in each abnormality determination.
  • the expansion valve opening degree large indicates that the opening degree of the determination target expansion valve is larger than a predetermined threshold value.
  • the large opening of the expansion valve indicates that the refrigerant in the receiver tank 241 is insufficient.
  • the control unit 490 increases the opening degree of the indoor unit side expansion valve 312 in order to increase the refrigerant flowing through the indoor heat exchanger 311.
  • the control unit 490 increases the degree of opening of the supercooling side expansion valve 252 in preparation for an increase in refrigerant flowing from the outdoor unit 200 to the outdoor unit 200.
  • the control unit 490 further increases the opening degree of the indoor unit side expansion valve 312 and the opening degree of the supercooling side expansion valve 252.
  • the control unit 490 increases the opening degree of the indoor unit side expansion valve 312 and the opening degree of the supercooling side expansion valve 252, thereby determining the object of determination.
  • the opening degree of the expansion valve becomes larger than the threshold value.
  • the determination target expansion valve is one or both of the indoor unit side expansion valve 312 and the supercooling side expansion valve 252.
  • a large degree of supercooling indicates that the degree of supercooling of the outdoor heat exchanger 231 is greater than a predetermined threshold.
  • This large degree of supercooling indicates that the refrigerant overflows from the receiver tank 241.
  • the refrigerant overflowing from the receiver tank 241 means that the receiver tank 241 is full and cannot accommodate the refrigerant.
  • the overflowed refrigerant accumulates in the outdoor heat exchanger 231, thereby increasing the degree of supercooling of the outdoor heat exchanger 231.
  • the receiver tank 241 determines that the degree of supercooling is large when the degree of supercooling of the outdoor heat exchanger 231 increases and becomes larger than the threshold value. Abnormality non-detection indicates that neither the expansion valve opening degree nor the supercooling degree is detected.
  • the air conditioning system main body determines that the amount of the refrigerant sealed in 100 is appropriate.
  • the abnormality determination result after the increase in the degree of supercooling in this case indicates that the refrigerant in the receiver tank 241 is insufficient with the refrigerant stored in the outdoor heat exchanger 231 intentionally.
  • the refrigerant does not overflow from the receiver tank 241 even if the amount of refrigerant in the receiver tank 241 changes due to environmental changes or the like. Be expected.
  • the amount by which the supercooling degree adjustment unit 492 increases the supercooling degree can be adjusted in advance so that an appropriate determination result can be obtained.
  • the refrigerant amount determination unit 493 determines that the abnormality is not detected or the degree of supercooling is large in the abnormality determination in the normal state and determines that the abnormality is not detected in the abnormality determination after the degree of supercooling is increased, the air conditioning system main body It is determined that the amount of the refrigerant sealed in 100 is excessive.
  • the refrigerant amount determination unit 493 determines that the amount of refrigerant enclosed in the air conditioning system main body 100 is excessive.
  • the refrigerant amount determination unit 493 determines that the amount of refrigerant enclosed in the air conditioning system main body 100 is excessive.
  • the refrigerant amount determination unit 493 determines that the expansion valve opening degree is large in the normal state abnormality determination and determines that the expansion valve opening degree is large in the abnormality determination after the degree of supercooling is increased, the air conditioning system main body 100 It is determined that the amount of the refrigerant sealed in is excessive.
  • the abnormality determination result in the normal state is that the expansion valve opening is large, it is considered that the refrigerant in the receiver tank 241 is insufficient as described above. Therefore, the refrigerant amount determination unit 493 determines that the amount of refrigerant enclosed in the air conditioning system main body 100 is too small.
  • the refrigerant amount determination unit 493 may determine whether or not the amount of refrigerant is appropriate based on the processing shown in FIG.
  • FIG. 5 is a flowchart illustrating an example of a processing procedure in a case where the control device 400 determines whether or not the refrigerant amount is appropriate based on the data at the two-stage supercooling degree.
  • the control unit 490 sets the operation mode of the air conditioning system main body 100 to the normal operation mode of the cooling cycle. Based on this setting, the control unit 490 controls the air conditioning system main body 100 to operate in a cooling cycle and in a normal state.
  • the normal state is a state in which control for restricting the outdoor expansion valve 232 is not performed in order to increase the degree of supercooling of the outdoor heat exchanger 231.
  • Step S102 The refrigerant amount determination unit 493 performs abnormality determination.
  • the abnormality determination here corresponds to the abnormality determination in the normal state. If it is determined that no abnormality has been detected (step S102: no abnormality detected), the process proceeds to step S111. If it is determined that the degree of supercooling is high (step S102: high degree of supercooling), the process proceeds to step S131. If it is determined that the expansion valve opening is large (step S102: expansion valve opening is large), the process proceeds to step S141.
  • Step S111 The supercooling degree adjusting unit 492 increases the supercooling degree of the outdoor heat exchanger 231 by restricting the outdoor expansion valve 232. After step S111, the process proceeds to step S112. (Step S112)
  • the refrigerant amount determination unit 493 performs abnormality determination.
  • the abnormality determination here corresponds to the abnormality determination after the degree of supercooling is increased. If it is determined that the expansion valve opening is large (step S121: expansion valve opening is large), the process proceeds to step S121. If it is determined that the abnormality is not detected, or if it is determined that the degree of supercooling is large (step S121: abnormality is not detected or the degree of supercooling is large), the process proceeds to step S131.
  • Step S121 The refrigerant amount determination unit 493 determines that the amount of refrigerant sealed in the air conditioning system main body 100 is appropriate. After step S121, the control device 400 ends the process of FIG. (Step S131) The refrigerant amount determination unit 493 determines that the amount of refrigerant enclosed in the air conditioning system main body 100 is excessive. After step S131, the control device 400 ends the process of FIG. (Step S141) The refrigerant amount determination unit 493 determines that the amount of refrigerant enclosed in the air conditioning system main body 100 is too small. After step S141, the control device 400 ends the process of FIG.
  • FIG. 6 is a flowchart illustrating an example of a processing procedure in which the control device 400 increases the degree of supercooling of the outdoor heat exchanger 231.
  • the control device 400 performs the process of FIG. 6 in step S111 of FIG. (Step S201)
  • 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 information indicating a temperature measurement value of the outdoor heat exchanger outlet temperature sensor 292. This outdoor heat exchanger outlet temperature information indicates the outlet temperature of the outdoor heat exchanger 231 in the cooling cycle.
  • step S201 the process proceeds to step S202.
  • 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 information calculated from the pressure measurement 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 S203 The information acquisition unit 491 calculates the degree of supercooling of the outdoor heat exchanger 231. Specifically, the refrigerant amount determination unit 493 calculates the 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. . After step S203, the process proceeds to step S204.
  • Step S204 The supercooling degree adjusting unit 492 sets a control target value for controlling the opening degree of the outdoor expansion valve 232 based on the supercooling degree obtained in step S203. For example, the supercooling degree adjustment unit 492 sets a target value for increasing the supercooling degree of the outdoor heat exchanger 231 by a predetermined temperature. After step S204, the process proceeds to step S205.
  • Step S205 The supercooling degree adjustment unit 492 performs control to reduce the opening degree of the outdoor expansion valve 232. For example, the supercooling degree adjusting unit 492 decreases the opening degree of the outdoor expansion valve 232 by a predetermined opening degree.
  • step S206 The supercooling degree adjustment unit 492 determines whether or not the target value set in step S204 has been reached. If it is determined that the target value has not been reached (step S206: NO), the process returns to step S205. If it is determined that the target value has been reached (step S206: YES), the control device 400 ends the process of FIG.
  • the refrigerant amount determination unit 493 may determine whether or not the refrigerant amount is appropriate based on data at three or more levels of supercooling.
  • FIG. 7 is a diagram illustrating an example of a determination criterion when the refrigerant amount determination unit 493 determines whether or not the refrigerant amount is appropriate based on data at three stages of supercooling degrees.
  • the refrigerant amount determination unit 493 is a refrigerant sealed in the air conditioning system main body 100 based on the abnormality determination results in the first supercooling degree, the second supercooling degree, and the third supercooling degree. Determine whether the amount is appropriate, excessive or insufficient.
  • the first degree of supercooling is the degree of supercooling in the normal state. Therefore, the first degree of supercooling is the degree of supercooling in a state in which control for restricting the outdoor expansion valve 232 is not performed in order to increase the degree of supercooling of the outdoor heat exchanger 231.
  • the second supercooling degree is a supercooling degree larger than the first supercooling degree.
  • the third degree of supercooling is a degree of supercooling that is greater than the second degree of supercooling.
  • the supercooling degree adjustment unit 492 changes the supercooling degree of the outdoor heat exchanger 231 to each of the first supercooling degree, the second supercooling degree, and the third supercooling degree.
  • the refrigerant amount determination unit 493 is based on the degree of opening of the determination target expansion valve and the degree of supercooling of the outdoor heat exchanger 231 in each of the first degree of subcooling, the second degree of subcooling, and the degree of third supercooling. It is determined whether the refrigerant amount of the air conditioning system 1 is appropriate. Or you may make it the supercooling degree adjustment part 492 determine whether the refrigerant
  • the supercooling degree adjustment unit 492 changes the supercooling degree of the outdoor heat exchanger 231 in three stages, and the refrigerant amount determination unit 493 is replaced with the determination criterion shown in FIG. 4. 7 is different from the case of FIG. 4 in that the determination is performed using the determination criteria shown in FIG. The rest is the same as in FIG.
  • the refrigerant amount determination unit 493 determines that the abnormality is not detected in the abnormality determination in the first subcooling degree, determines that the abnormality is not detected in the abnormality determination in the second subcooling degree, and the third subcooling. When it is determined that the expansion valve opening degree is large in the abnormality determination in degree, it is determined that the amount of the refrigerant sealed in the air conditioning system main body 100 is appropriate.
  • the refrigerant amount determination unit 493 determines that the abnormality is not detected or the degree of supercooling is high in the abnormality determination in the first supercooling degree, and determines that the abnormality is not detected or the degree of supercooling is high in the abnormality determination in the second supercooling degree. And when it determines with abnormality non-detecting by abnormality determination in a 3rd supercooling degree, it determines with the quantity of the refrigerant
  • the refrigerant amount determination unit 493 determines that the abnormality is not detected or the expansion valve opening is large in the abnormality determination in the first subcooling degree, determines that the expansion valve opening is large in the abnormality determination in the second subcooling degree, and When it is determined that the expansion valve opening degree is large in the abnormality determination in the third supercooling degree, it is determined that the amount of the refrigerant sealed in the air conditioning system main body 100 is too small.
  • the refrigerant amount determination unit 493 determines that the degree of supercooling is large in the abnormality determination in the first subcooling degree
  • the refrigerant sealed in the air conditioning system main body 100 is the same as described in the example of FIG. Is determined to be excessive.
  • the refrigerant amount determination unit 493 is enclosed in the air conditioning system main body 100 as described in the example of FIG. It determines with the quantity of a refrigerant
  • the second degree of supercooling is a degree of supercooling set to distinguish between a case where the amount of refrigerant is particularly appropriate and a case where the amount of refrigerant is too small.
  • the second degree of supercooling is set to a degree of supercooling that is smaller than the degree of supercooling after the increase in degree of supercooling in the example of FIG.
  • the third degree of supercooling is a degree of supercooling set to distinguish between a case where the amount of refrigerant is particularly appropriate and a case where the amount of refrigerant is excessive.
  • the third supercooling degree is set to the same supercooling degree as the supercooling degree after the supercooling degree increase in the example of FIG.
  • the refrigerant amount determination unit 493 determines that the abnormality is not detected in the abnormality determination in the third supercooling degree, the amount of the refrigerant sealed in the air conditioning system main body 100 is the same as described in the example of FIG. It is determined that there are too many.
  • the refrigerant amount determination unit 493 may determine whether or not the amount of refrigerant is appropriate based on the processing shown in FIG.
  • FIG. 8 is a flowchart illustrating an example of a processing procedure in the case where the control device 400 determines whether or not the refrigerant amount is appropriate based on data at three stages of supercooling degrees. Steps S301 to S302 are the same as steps S101 to S102 in FIG. The abnormality determination in step S301 corresponds to the abnormality determination in the first supercooling degree. If it is determined in step S302 that no abnormality is detected (step S302: no abnormality detected), the process proceeds to step S311.
  • step S302 If it is determined that the degree of supercooling is high (step S302: high degree of supercooling), the process proceeds to step S341. If it is determined that the expansion valve opening is large (step S302: expansion valve opening is large), the process proceeds to step S351.
  • Step S311 The supercooling degree adjusting unit 492 increases the supercooling degree of the outdoor heat exchanger 231 by restricting the outdoor expansion valve 232.
  • the control device 400 performs the process of FIG. 6 so that the supercooling degree adjusting unit 492 increases the supercooling degree of the outdoor heat exchanger 231.
  • the supercooling degree adjusting unit 492 sets the supercooling degree of the outdoor heat exchanger 231 to the second supercooling degree. After step S311, the process proceeds to step S312.
  • Step S312 The refrigerant amount determination unit 493 performs abnormality determination.
  • the abnormality determination here corresponds to the abnormality determination in the second supercooling degree. If it is determined that no abnormality is detected (step S312: no abnormality detected), the process proceeds to step S321. If it is determined that the degree of supercooling is high (step S312: high degree of supercooling), the process proceeds to step S341. If it is determined that the expansion valve opening is large (step S312: expansion valve opening is large), the process proceeds to step S351.
  • Step S321 The supercooling degree adjusting unit 492 increases the supercooling degree of the outdoor heat exchanger 231 by restricting the outdoor expansion valve 232.
  • the control device 400 performs the process of FIG. 6 so that the supercooling degree adjustment unit 492 increases the supercooling degree of the outdoor heat exchanger 231.
  • the supercooling degree adjusting unit 492 sets the supercooling degree of the outdoor heat exchanger 231 to the third supercooling degree. After step S321, the process proceeds to step S322.
  • Step S322 The refrigerant amount determination unit 493 performs abnormality determination.
  • the abnormality determination here corresponds to the abnormality determination in the third supercooling degree. If it is determined that the expansion valve opening is large (step S322: expansion valve opening is large), the process proceeds to step S331. If it is determined that the abnormality is not detected, or if it is determined that the degree of supercooling is large (step S322: abnormality is not detected or the degree of supercooling is large), the process proceeds to step S341.
  • Step S331 The refrigerant amount determination unit 493 determines that the amount of refrigerant sealed in the air conditioning system main body 100 is appropriate. After step S331, the control device 400 ends the process of FIG. (Step S341) The refrigerant amount determination unit 493 determines that the amount of refrigerant enclosed in the air conditioning system main body 100 is excessive. After step S341, the control device 400 ends the process of FIG. (Step S351) The refrigerant amount determination unit 493 determines that the amount of refrigerant enclosed in the air conditioning system main body 100 is too small. After step S351, the control device 400 ends the process of FIG.
  • the supercooling degree adjusting unit 492 increases the supercooling degree of the outdoor heat exchanger 231.
  • the refrigerant amount determination unit 493 is a refrigerant of the air-conditioning system 1 based on the opening degree of the determination target expansion valve before increasing the degree of supercooling and the opening degree of the determination target expansion valve after increasing the degree of supercooling. Determine if the amount is appropriate. If the control device 400 determines whether or not the amount of refrigerant in the air-conditioning system 1 is appropriate based only on information in a state where the degree of supercooling of the outdoor heat exchanger 231 is not increased, the receiver tank 241 It is not possible to determine how much refrigerant can be accommodated.
  • the control apparatus 400 can increase the supercooling degree of the outdoor heat exchanger 231, so that the refrigerant is intentionally stored in the outdoor heat exchanger 231 and the amount of refrigerant in the receiver tank 241 can be reduced.
  • the control device 400 can determine whether or not the receiver tank 241 can accommodate a sufficient amount of refrigerant in a state where the degree of supercooling of the outdoor heat exchanger 231 is not increased. it can. Therefore, the control device 400 can determine the possibility that the refrigerant overflows from the receiver tank 241 when the amount of refrigerant in the receiver tank 241 increases due to environmental changes or the like.
  • control device 400 determines whether or not the amount of refrigerant in the air-conditioning system 1 is more appropriate than when determining based on only information in a state where the degree of supercooling of the outdoor heat exchanger 231 is not increased. Can be determined with high accuracy.
  • the supercooling degree adjustment unit 492 can increase the supercooling degree of the outdoor heat exchanger 231 by reducing the opening degree of the outdoor expansion valve 232.
  • coolant amount determination part 493 is suitable for the refrigerant
  • the supercooling degree adjusting unit 492 changes the supercooling degree of the outdoor heat exchanger 231 to each of the first supercooling degree, the second supercooling degree, and the third supercooling degree.
  • the refrigerant amount determination unit 493 determines whether the refrigerant amount of the air conditioning system 1 is appropriate based on the opening degree of the determination target expansion valve in each of the first subcooling degree, the second subcooling degree, and the third supercooling degree. Judgment is made.
  • the refrigerant amount determination unit 493 determines whether or not the refrigerant amount is insufficient when the refrigerant amount in the receiver tank 241 decreases to some extent from the refrigerant amount in the normal state, using information in the case of the second supercooling degree. can do.
  • the refrigerant quantity determination unit 493 can determine whether or not the refrigerant quantity of the air conditioning system 1 is too small. Further, the refrigerant amount determination unit 493 uses the information in the case of the third supercooling degree, and as described above, the receiver tank 241 has a sufficient capacity in a state where the supercooling degree of the outdoor heat exchanger 231 is not increased. It can be determined whether an amount of refrigerant can be accommodated. In this regard, the control device 400 can determine whether or not the amount of refrigerant in the air conditioning system 1 is appropriate with higher accuracy.
  • a program for realizing all or part of the functions of the control unit 490 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. You may perform the process of.
  • the “computer system” includes an OS and hardware such as peripheral devices. Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
  • the “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, and a hard disk incorporated in a computer system.
  • the program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.
  • Embodiment of this invention acquires the expansion valve opening degree information which shows the opening degree of the determination object expansion valve which is at least one of the expansion valve of the indoor unit with which an air conditioning system is provided, or the expansion valve by the side of a supercooling heat exchanger
  • the refrigerant amount determination device includes: a refrigerant amount determination unit that determines whether or not the refrigerant amount of the air-conditioning system is appropriate based on the opening degree of the determination target expansion valve after increasing the degree. According to this embodiment, it can be determined with higher accuracy whether or not the refrigerant amount of the air conditioning system is appropriate.
  • Air conditioning system 100 Air conditioning system main body 200 Outdoor unit 211 Compressor 212 Accumulator 221 Four-way valve 231 Outdoor heat exchanger 232 Outdoor expansion valve 241 Receiver tank 251 Supercooling heat exchanger 252 Supercooling side expansion valve 291 High pressure side pressure sensor 292 Outdoor heat exchanger outlet temperature sensor 300 Indoor unit 311 Indoor heat exchanger 312 Indoor unit side expansion valve 400 Controller 410 Communication unit 420 Operation input unit 430 Display unit 480 Storage unit 490 Control unit 491 Information acquisition unit 492 Supercooling degree adjustment Part 493 Refrigerant amount determination part

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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)

Abstract

L'invention concerne un dispositif de détermination de charge de réfrigérant qui comprend: une unité d'acquisition d'informations (491) qui acquiert des informations d'ouverture de détendeur qui indiquent le degré auquel le détendeur soumis à la détermination est ouvert, le détendeur étant au moins l'un d'un détendeur dans une unité intérieure constituant un système de climatisation ou un détendeur sur un côté d'échangeur de chaleur de sous-refroidissement; une unité de régulation de sous-refroidissement (492) qui augmente le degré de sous-refroidissement d'un échangeur de chaleur extérieur constituant le système de climatisation; et une unité de détermination de charge de réfrigérant (493) qui détermine si la charge de réfrigérant dans le système de climatisation est appropriée sur la base du degré auquel le détendeur soumis à la détermination est ouvert avant d'augmenter le degré de sous-refroidissement et le degré auquel le détendeur soumis à la détermination est ouvert après augmentation du degré de sous-refroidissement.
PCT/JP2018/003151 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 WO2018159202A1 (fr)

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CN201880008170.0A CN110199163A (zh) 2017-02-28 2018-01-31 制冷剂量判定装置、空气调节系统、制冷剂量判定方法以及程序
EP18761976.2A EP3561413A1 (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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CN113883690A (zh) * 2021-10-25 2022-01-04 青岛海信日立空调系统有限公司 空气调节装置
CN114413429A (zh) * 2022-01-26 2022-04-29 青岛海信日立空调系统有限公司 空调系统

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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
JP7553833B2 (ja) 2022-09-20 2024-09-19 ダイキン工業株式会社 熱源ユニット、および冷凍装置
CN117469865B (zh) * 2023-12-21 2024-08-16 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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