EP3757471A1 - Unité d'intérieur de faible capacité - Google Patents

Unité d'intérieur de faible capacité Download PDF

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Publication number
EP3757471A1
EP3757471A1 EP19756797.7A EP19756797A EP3757471A1 EP 3757471 A1 EP3757471 A1 EP 3757471A1 EP 19756797 A EP19756797 A EP 19756797A EP 3757471 A1 EP3757471 A1 EP 3757471A1
Authority
EP
European Patent Office
Prior art keywords
unit
low
indoor
capacity
indoor unit
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Withdrawn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
EP19756797.7A
Other languages
German (de)
English (en)
Other versions
EP3757471A4 (fr
Inventor
Yuuki Fujioka
Tomohiko Tsutsumi
Katsunori Murata
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.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
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Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of EP3757471A1 publication Critical patent/EP3757471A1/fr
Publication of EP3757471A4 publication Critical patent/EP3757471A4/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52—Indication arrangements, e.g. displays
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • 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
    • F25B2313/031—Sensor arrangements
    • F25B2313/0314—Temperature sensors near the indoor 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0315—Temperature 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
    • F25B2500/00—Problems to be solved
    • F25B2500/23—High amount of refrigerant in the system
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present disclosure relates to low-capacity indoor units.
  • Some conventional air conditioners are equipped with a ceiling-mounted indoor unit embedded in a ceiling of a room, and an outdoor unit connected to the indoor unit (for example, see JP 2016-148510 A (Patent Literature 1)).
  • the indoor unit When a flammable refrigerant is used in such an air conditioner, the indoor unit is installed at a specified installation height so as to meet "allowable floor area based on a refrigerant charge amount" specified in an international standard. This prevents, even when the refrigerant leaks from the indoor unit, the concentration of the refrigerant in the room from exceeding a certain level.
  • Patent Literature 1 JP 2016-148510 A
  • the above-described conventional air conditioner typically has a rated cooling capacity of 2.2 kW or more.
  • a low-capacity indoor unit having a rated cooling capacity of less than 2.2 kW is installed in a space with a small floor area such as a washroom, if the refrigerant leaks from the low-capacity indoor unit and fills the small space, a risk due to the refrigerant leakage increases depending on the refrigerant charge amount.
  • a flammable refrigerant including a slightly flammable refrigerant such as R32 refrigerant
  • a risk of ignition or the like increases accordingly.
  • the present disclosure proposes a low-capacity indoor unit that reduces a risk due to refrigerant leakage.
  • a low-capacity indoor unit has a rated cooling capacity of less than 2.2 kW and includes an announcement unit that announces an abnormality when the low-capacity indoor unit is connected to an outdoor unit other than a dedicated outdoor unit with which the low-capacity indoor unit is permitted to be combined.
  • the announcement unit announces an abnormality when the low-capacity indoor unit having the rated cooling capacity of less than 2.2 kW is connected to an outdoor unit other than the dedicated outdoor unit with which the low-capacity indoor unit is permitted to be combined, the low-capacity indoor unit is prevented from being connected to an outdoor unit, other than the dedicated outdoor unit, having a larger refrigerant charge amount and put into operation, thereby reducing a risk due to refrigerant leakage.
  • the rated cooling capacity is equal to or less than 1.6 kW.
  • the low-capacity indoor unit is suitable for air conditioning in a small space such as a washroom or a kitchen and is safer against refrigerant leakage to a small space.
  • the dedicated outdoor unit is compatible with a multi-type air conditioner in which a plurality of indoor units are connectable to an outdoor unit, and the low-capacity indoor unit is operable as an indoor unit of the multi-type air conditioner and is one of the plurality of indoor units.
  • a multi-type air conditioner in which a plurality of indoor units including at least one low-capacity indoor unit are connected to the dedicated outdoor unit.
  • the announcement unit announces an abnormality when an allowable refrigerant charge amount for an outdoor unit, which is connected to the low-capacity indoor unit, notified from the outdoor unit is greater than an allowable refrigerant charge amount calculated in advance from the rated cooling capacity.
  • the announcement unit can determine whether the outdoor unit is the dedicated outdoor unit with which the low-capacity indoor unit is permitted to be combined on the basis of the allowable refrigerant charge amount for the connected outdoor unit notified from the outdoor unit.
  • FIG. 1 is a structure diagram of a multi-type air conditioner including a low-capacity indoor unit 20C according to a first embodiment of the present disclosure.
  • the multi-type air conditioner according to the first embodiment includes, as shown in FIG. 1 , an indoor unit 20A including an indoor heat exchanger 4A and an indoor fan 5A, an indoor unit 20B including an indoor heat exchanger 4B and an indoor fan 5B, the low-capacity indoor unit 20C including an indoor heat exchanger 4C and an indoor fan 5C, and a dedicated outdoor unit 10 connected to the indoor units 20A, 20B and the low-capacity indoor unit 20C via refrigerant pipes.
  • the dedicated outdoor unit 10 is compatible with a multi-type air conditioner in which a plurality of indoor units are connectable to an outdoor unit, and the low-capacity indoor unit 20C is operable as an indoor unit of the multi-type air conditioner.
  • 1 denotes a compressor
  • 2 denotes a four-way switching valve having one end connected to a discharge side of the compressor
  • 3 denotes an outdoor heat exchanger having one end connected to the other end of the four-way switching valve
  • EVA, EVB, EVC denote electrically powered expansion valves each having one end connected to the other end of the outdoor heat exchanger
  • 4A, 4B, 4C denote the indoor heat exchangers each having one end connected to the other end of a corresponding one of the electrically powered expansion valves
  • EVA, EVB, EVC and 6 denotes an accumulator having one end connected to the other ends of the indoor heat exchangers 4A, 4B, 4C via the four-way switching valve 2 and having the other end connected to an intake side of the compressor 1.
  • the indoor fans 5A, 5B, 5C are arranged near the indoor heat exchangers 4A, 4B, 4C, respectively.
  • the electrically powered expansion valves EVA, EVB, EVC each have the other end connected to a corresponding one of a plurality of refrigerant pipe connection parts 7A, 7B, 7C
  • the indoor heat exchangers 4A, 4B, 4C each have the one end connected to a corresponding one of the plurality of refrigerant pipe connection parts 7A, 7B, 7C via a connection pipe (refrigerant pipe).
  • the indoor heat exchangers 4A, 4B, 4C have the other ends connected to a plurality of refrigerant pipe connection parts 8A, 8B, 8C, respectively, via respective connection pipes (refrigerant pipes).
  • the compressor 1, the four-way switching valve 2, the outdoor heat exchanger 3, the electrically powered expansion valves EVA, EVB, EVC, the indoor heat exchangers 4A, 4B, 4C, and the accumulator 6 constitute a refrigerant circuit.
  • This refrigerant circuit is filled with a slightly flammable R32 refrigerant.
  • the outdoor heat exchanger 3 is provided with an outdoor heat exchanger temperature sensor 12 that detects an outdoor heat exchanger temperature, and, in the vicinity of the outdoor heat exchanger 3, an outdoor temperature sensor 13 that detects an outdoor temperature is provided.
  • the indoor heat exchanger 4A is provided with an indoor heat exchanger temperature sensor 15A that detects an indoor heat exchanger temperature, and, in the vicinity of the indoor heat exchanger 4A, an indoor temperature sensor 16A that detects an indoor temperature is provided.
  • the indoor heat exchanger 4B is provided with an indoor heat exchanger temperature sensor 15B that detects an indoor heat exchanger temperature, and, in the vicinity of the indoor heat exchanger 4B, an indoor temperature sensor 16B that detects an indoor temperature is provided.
  • the indoor heat exchanger 4C is provided with an indoor heat exchanger temperature sensor 15C that detects an indoor heat exchanger temperature, and, in the vicinity of the indoor heat exchanger 4C, an indoor temperature sensor 16C that detects an indoor temperature is provided.
  • the dedicated outdoor unit 10 includes an outdoor control device 18 including a microcomputer, an input-output circuit, and the like.
  • the outdoor control device 18 includes an operation control unit 18a that controls the compressor 1, the electrically powered expansion valves EVA, EVB, EVC, and the like, and a communication unit 18b.
  • the indoor units 20A, 20B each include an indoor control device (not shown), and the low-capacity indoor unit 20C includes an indoor control device 100 shown in FIG. 2 .
  • the indoor control devices of the indoor units 20A, 20B and the indoor control device 100 of the low-capacity indoor unit 20C communicate with the outdoor control device 18 of the dedicated outdoor unit 10 through a communication line (not shown) so as to cause the outdoor control device 18, the indoor control devices of the indoor units 20A, 20B, and the indoor control device 100 of the low-capacity indoor unit 20C to operate in cooperation with each other as the multi-type air conditioner.
  • the four-way switching valve 2 is switched to a position represented by a dotted line, and then the compressor 1 is put into operation. Then, each of the electrically powered expansion valves EVA, EVB, EVC is opened to a predetermined opening degree. Then, a high-temperature and high-pressure gas refrigerant discharged from the compressor 1 exchanges heat with outdoor air in the outdoor heat exchanger 3 with the help of an outdoor fan (not shown) in operation to be condensed to a liquid refrigerant.
  • a liquid refrigerant from the indoor heat exchangers 4A, 4B, 4C is decompressed by the electrically powered expansion valves EVA, EVB, EVC, exchanges heat with indoor air in the indoor heat exchangers 4A, 4B, 4C with the help of the indoor fans 5A, 5B, 5C in operation to be evaporated to become a gas refrigerant.
  • the gas refrigerant then returns to the intake side of the compressor 1.
  • the indoor units 20A, 20B have a rated cooling capacity of 2.2 kW
  • the low-capacity indoor unit 20C has a rated cooling capacity of 0.8 kW. That is, the low-capacity indoor unit 20C has lower capacity than the indoor units 20A, 20B.
  • the four-way switching valve 2 is switched to a position represented by a solid line, and then the compressor 1 is put into operation. Then, each of the electrically powered expansion valves EVA, EVB, EVC is opened to a predetermined opening degree. Then, a high-temperature and high-pressure gas refrigerant discharged from the compressor 1 exchanges heat with indoor air in the indoor heat exchangers 4A, 4B, 4C with the help of the indoor fans 5A, 5B, 5C in operation to be condensed to a liquid refrigerant.
  • the liquid refrigerant from the indoor heat exchangers 4A, 4B, 4C is decompressed by the electrically powered expansion valves EVA, EVB, EVC, exchanges heat with outdoor air in the outdoor heat exchanger 3 with the help of the outdoor fan (not shown) in operation to be evaporated to become a gas refrigerant.
  • the gas refrigerant then returns to the intake side of the compressor 1.
  • FIG. 2 is an external view of the low-capacity indoor unit 20C viewed from obliquely below. This indoor unit is designed to be embedded in a ceiling.
  • the low-capacity indoor unit 20C includes a casing main body 101, a panel 102 having a rectangular shape and provided below the casing main body 101, and a grille 103 detachably mounted to the panel 102.
  • the panel 102 has, on its one end in a longitudinal direction, a blow-out port 110 extending along a short side of the panel 102.
  • a flap 120 is mounted to the panel 102 pivotably. In FIG. 2 , the flap 120 closes the blow-out port 110.
  • a drain socket 107 is further provided so as to protrude from a sidewall of the casing main body 101.
  • the drain socket 107 is connected to an external drain hose (not shown).
  • Pipe connection parts 105, 106 are further provided so as to protrude from the sidewall of the casing main body 101.
  • the pipe connection parts 105, 106 are each connected to a corresponding external refrigerant pipe (not shown).
  • 108 denotes an electrical components unit
  • 111 to 113 denote hanger fittings each protruding sideward from the casing main body 101.
  • FIG. 3 is a block diagram of the indoor control device 100 of the low-capacity indoor unit 20C.
  • the low-capacity indoor unit 20C includes the indoor control device 100 including a microcomputer, an input-output circuit, and the like.
  • the indoor control device 100 includes an operation control unit 100a, a communication unit 100b, a model determination unit 100c, and an announcement unit 100d.
  • the operation control unit 100a controls a fan motor 21 and a flap drive unit 22 on the basis of detection signals from the indoor temperature sensor 16C and the indoor heat exchanger temperature sensor 15C.
  • the communication unit 100b communicates with the outdoor control device 18 (shown in FIG. 1 ) of the dedicated outdoor unit 10 connected to the low-capacit
  • the model determination unit 100c determines whether a connected outdoor unit is the dedicated outdoor unit with which the low-capacity indoor unit 20C is permitted to be combined on the basis of a model ID of the outdoor unit received via the communication unit 100b.
  • the announcement unit 100d causes a power source lamp of a display unit 23 to blink to announce an abnormality.
  • a buzzer sound may be emitted at the same time when the power source lamp blinks.
  • the means for announcing an abnormality is not limited to the power source lamp or the buzzer sound, and, for example, the abnormality may be announced by the display unit or in the form of voice output.
  • FIG. 4 is a flowchart of an operation of the indoor control device 100.
  • an outdoor unit is connected to the low-capacity indoor unit 20C, and then the indoor control device 100 is put into operation on turning on the power source first.
  • step S1 shown in FIG. 4 a determination is made as to whether an outdoor unit is connected to the low-capacity indoor unit 20C. If it is determined that the outdoor unit is connected to the low-capacity indoor unit 20C, the process proceeds to step S2. On the other hand, when no outdoor unit is connected to the low-capacity indoor unit 20C, step S1 is repeated.
  • step S2 a model ID is obtained from the outdoor unit via the communication unit 100b.
  • the model determination unit 100c determines whether the outdoor unit thus connected is the dedicated outdoor unit with which the low-capacity indoor unit 20C is permitted to be combined on the basis of the model ID obtained from the outdoor unit.
  • step S3 When it is determined in step S3 that the outdoor unit is the dedicated outdoor unit, the process proceeds to step S4. On the other hand, when it is determined that the outdoor unit is not the dedicated outdoor unit, the process proceeds to step S5 to cause the announcement unit 100d to announce an abnormality, and then the process is brought to an end.
  • step S4 the low-capacity indoor unit 20C is put into normal operation, that is, cooling operation or heating operation in accordance with a command from a remote controller or the like.
  • the low-capacity indoor unit 20C configured as described above has a rated cooling capacity of less than 2.2 kW and causes the announcement unit 100d to announce an abnormality when the low-capacity indoor unit 20C is connected to an outdoor unit other than the dedicated outdoor unit 10 with which the low-capacity indoor unit 20C is permitted to be combined. This prevents the low-capacity indoor unit 20C from being connected to an outdoor unit, other than the dedicated outdoor unit 10, having a larger refrigerant charge amount and put into operation, thereby reducing a risk due to refrigerant leakage.
  • an allowable refrigerant charge amount for the dedicated outdoor unit 10 is equal to an amount of refrigerant charged into a refrigerant circuit in the multi-type air conditioner including the dedicated outdoor unit 10 and the maximum number of indoor units each connected to the dedicated outdoor unit 10 via a corresponding pipe having a maximum allowable length.
  • the allowable refrigerant charge amount for the dedicated outdoor unit 10 is 1.8 kg.
  • the maximum concentration when the refrigerant has leaked is equal to or less than 0.227 kg/m 3 ( ⁇ 1.8 kg(3.3 m 2 * 2.4 m)).
  • the allowable refrigerant charge amount is 4.0 kg.
  • the installation location is a living room, a kitchen, or the like having a room area of about 7 m 2 * a ceiling height of 2.4 m
  • the maximum concentration when the refrigerant has leaked is equal to or less than 0.238 kg/m 3 ( ⁇ 4.0 kg(7 m 2 * 2.4 m)).
  • the maximum concentration (0.227 or less) when the refrigerant has leaked is smaller in the multi-type air conditioner including the low-capacity indoor unit 20C, and thus such a multi-type air conditioner is safer against refrigerant leakage.
  • the low-capacity indoor unit 20C has a rated cooling capacity of 1.6 kW (0.8 kW according to the present embodiment) or less, the low-capacity indoor unit 20C is suitable for air conditioning in a small space such as a washroom and is safer against refrigerant leakage to a small space.
  • the model determination unit 100c and the announcement unit 100d are provided in the low-capacity indoor unit 20C, or alternatively, may be provided in the dedicated outdoor unit 10.
  • FIG. 5 is a block diagram of an indoor control device 200 of a low-capacity indoor unit 20C according to a second embodiment of the present disclosure.
  • the low-capacity indoor unit 20C according to the second embodiment has the same structure as the low-capacity indoor unit 20C according to the first embodiment except for the indoor control device 200.
  • the low-capacity indoor unit 20C includes the indoor control device 200 including a microcomputer, an input-output circuit, and the like.
  • the indoor control device 200 includes an operation control unit 200a, a communication unit 200b, an allowable refrigerant charge amount determination unit 200c, and an announcement unit 200d.
  • the operation control unit 200a controls the fan motor 21 and the flap drive unit 22 on the basis of detection signals from the indoor temperature sensor 16C and the indoor heat exchanger temperature sensor 15C.
  • the communication unit 200b communicates with the outdoor control device 18 (shown in FIG. 1 ) of the dedicated outdoor unit 10 connected to the low-capacity indoor unit 20C via the communication unit 18b.
  • the allowable refrigerant charge amount determination unit 200c determines whether an allowable refrigerant charge amount X received from an outdoor unit via the communication unit 200b is greater than an allowable refrigerant charge amount A calculated in advance from the rated cooling capacity 0.8 kW of the low-capacity indoor unit 20C.
  • a volume of a room to which the low-capacity indoor unit 20C is applied is obtained from a floor area (3.3 m 2 ) and ceiling height (2.4 m) of the room, for example, and then the allowable refrigerant charge amount A in which the maximum concentration in refrigerant leakage when the refrigerant has leaked to the room having the volume is equal to or less than 0.227 kg/m 3 ( ⁇ 1.8 kg(3.3 m 2 * 2.4 m)) is calculated in advance from the rated cooling capacity 0.8 kW of the low-capacity indoor unit 20C.
  • the announcement unit 200d causes the power source lamp of the display unit 23 to blink to announce an abnormality.
  • a buzzer sound may be emitted at the same time when the power source lamp blinks.
  • the means for announcing an abnormality is not limited to the power source lamp or the buzzer sound, and, for example, the abnormality may be announced by the display unit or in the form of voice output.
  • FIG. 6 is a flowchart of an operation of the indoor control device 200.
  • an outdoor unit is connected to the low-capacity indoor unit 20C, and then the indoor control device 200 is put into operation on turning on the power source first.
  • step S11 a determination is made as to whether an outdoor unit is connected to the low-capacity indoor unit 20C. If it is determined that the outdoor unit is connected to the low-capacity indoor unit 20C, the process proceeds to step S12. On the other hand, when no outdoor unit is connected to the low-capacity indoor unit 20C, step S11 is repeated.
  • step S12 the allowable refrigerant charge amount X is obtained from the outdoor unit via the communication unit 200b.
  • the allowable refrigerant charge amount determination unit 200c determines whether the allowable refrigerant charge amount X for the outdoor unit is greater than the allowable refrigerant charge amount A calculated in advance from the rated cooling capacity of the low-capacity indoor unit 20C.
  • step S13 When it is determined in step S13 that the allowable refrigerant charge amount X is greater than the allowable refrigerant charge amount A, the process proceeds to step S15 to cause the announcement unit 100d to announce the abnormality, and then the process is brought to an end. On the other hand, when it is determined in step S13 that the allowable refrigerant charge amount X is equal to or less than the allowable refrigerant charge amount A, the process proceeds to step S14.
  • step S14 the low-capacity indoor unit 20C is put into normal operation, that is, cooling operation or heating operation in accordance with a command from a remote controller or the like.
  • the low-capacity indoor unit 20C configured as described above, making the allowable refrigerant charge amount X for the dedicated outdoor unit 10 less than the allowable refrigerant charge amount A calculated in advance from the rated cooling capacity of the low-capacity indoor unit 20C prevents, when the low-capacity indoor unit 20C is connected to the dedicated outdoor unit 10, the announcement unit 200d from announcing an abnormality.
  • the allowable refrigerant charge amount X for the outdoor unit notified is greater than the allowable refrigerant charge amount A calculated in advance from the rated cooling capacity, which causes the announcement unit 200d to announce an abnormality.
  • the allowable refrigerant charge amount determination unit 200c is provided in the low-capacity indoor unit 20C, or alternatively, may be provided in the dedicated outdoor unit 10.
  • the multi-type air conditioner including the dedicated outdoor unit 10 and the plurality of indoor units (including the low-capacity indoor unit 20C) connected to the dedicated outdoor unit 10, but the present disclosure may be applied to an air conditioner in which the dedicated outdoor unit and the low-capacity indoor unit are connected to each other on a one-to-one basis.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
EP19756797.7A 2018-02-23 2019-01-30 Unité d'intérieur de faible capacité Withdrawn EP3757471A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018031021A JP6853205B2 (ja) 2018-02-23 2018-02-23 低能力室内機
PCT/JP2019/003197 WO2019163451A1 (fr) 2018-02-23 2019-01-30 Unité d'intérieur de faible capacité

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EP3757471A1 true EP3757471A1 (fr) 2020-12-30
EP3757471A4 EP3757471A4 (fr) 2021-11-17

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JP3346616B2 (ja) * 1993-10-07 2002-11-18 三菱電機株式会社 空気調和機の制御装置
JP3326999B2 (ja) * 1994-10-21 2002-09-24 松下電器産業株式会社 多室空気調和機
JP5011957B2 (ja) * 2006-09-07 2012-08-29 ダイキン工業株式会社 空気調和装置
EP2309194B1 (fr) * 2008-10-29 2015-08-26 Mitsubishi Electric Corporation Climatiseur
JP2014137217A (ja) * 2013-01-18 2014-07-28 Mitsubishi Electric Corp 空気調和システム及びその運転方法
JP2015105811A (ja) * 2013-12-02 2015-06-08 ダイキン工業株式会社 空気調和機
JP6124818B2 (ja) * 2014-03-03 2017-05-10 三菱電機株式会社 空気調和装置
JP6529747B2 (ja) * 2014-11-20 2019-06-12 三菱重工サーマルシステムズ株式会社 空気調和機
CN104566823B (zh) * 2014-12-29 2018-03-16 广东美的暖通设备有限公司 并联多联机的冷媒控制方法
KR102343081B1 (ko) * 2015-02-25 2021-12-24 삼성전자주식회사 공조 장치 및 상기 공조 장치의 제어 방법
CN105650769B (zh) * 2015-10-28 2019-06-07 李国胜 一种变制冷剂流量的一拖多辐射式中央空调系统
JP6117967B2 (ja) 2016-04-07 2017-04-19 三菱電機株式会社 空気調和装置
JP2018013307A (ja) * 2016-07-22 2018-01-25 株式会社富士通ゼネラル 空気調和装置
JP2018017436A (ja) * 2016-07-27 2018-02-01 株式会社谷口設備 空調設備及びこの空調設備を用いた省力化工事方法

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JP6853205B2 (ja) 2021-03-31
EP3757471A4 (fr) 2021-11-17
JP2019143943A (ja) 2019-08-29
WO2019163451A1 (fr) 2019-08-29

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