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US20160348927A1 - Air conditioner - Google Patents

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Publication number
US20160348927A1
US20160348927A1 US15/117,240 US201415117240A US2016348927A1 US 20160348927 A1 US20160348927 A1 US 20160348927A1 US 201415117240 A US201415117240 A US 201415117240A US 2016348927 A1 US2016348927 A1 US 2016348927A1
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US
United States
Prior art keywords
refrigerant
heat source
source unit
air conditioner
blower
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.)
Abandoned
Application number
US15/117,240
Other languages
English (en)
Inventor
Michiko Endo
Hiroaki Tsuboe
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.)
Hitachi Johnson Controls Air Conditioning Inc
Original Assignee
Johnson Controls Hitachi Air Conditioning Technology Hong Kong 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 Johnson Controls Hitachi Air Conditioning Technology Hong Kong Ltd filed Critical Johnson Controls Hitachi Air Conditioning Technology Hong Kong Ltd
Assigned to JOHNSON CONTROLS-HITACHI AIR CONDITIONING TECHNOLOGY (HONG KONG) LIMITED reassignment JOHNSON CONTROLS-HITACHI AIR CONDITIONING TECHNOLOGY (HONG KONG) LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TSUBOE, HIROAKI, ENDO, MICHIKO
Publication of US20160348927A1 publication Critical patent/US20160348927A1/en
Assigned to HITACHI-JOHNSON CONTROLS AIR CONDITIONING, INC. reassignment HITACHI-JOHNSON CONTROLS AIR CONDITIONING, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JOHNSON CONTROLS-HITACHI AIR CONDITIONING TECHNOLOGY (HONG KONG) LIMITED
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/20—Electric components for separate outdoor units
    • F24F1/22—Arrangement or mounting thereof
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/20—Electric components for separate outdoor units
    • F24F1/24—Cooling of electric components
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/26—Refrigerant piping
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/46—Component arrangements in separate outdoor units
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/46—Component arrangements in separate outdoor units
    • F24F1/48—Component arrangements in separate outdoor units characterised by air airflow, e.g. inlet or outlet airflow
    • 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
    • F25B49/005—Arrangement or mounting of control or safety devices of safety devices
    • 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
    • F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
    • F24F2011/0084—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/14—Details or features not otherwise provided for mounted on the ceiling
    • 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
    • F25B2313/029—Control issues
    • F25B2313/0294—Control issues related to the outdoor fan, e.g. controlling speed
    • 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
    • F25B2400/12—Inflammable refrigerants
    • F25B2400/121—Inflammable refrigerants using R1234
    • 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
    • F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
    • F25B2500/222—Detecting refrigerant leaks

Definitions

  • the present invention relates to an air conditioner and particularly to an air conditioner that uses a refrigerant having a low global warming potential (GWP) (Global Warming Potential).
  • GWP global warming potential
  • Patent Literature 1 JP-A-H11-37619 (Patent Literature 1), an air conditioner using a hydrocarbon natural refrigerant has been proposed. Additionally, in Patent Literature 1, refrigerant leakage detection means is provided to detect leakage of a hydrocarbon natural refrigerant, which is flammable. When the refrigerant leakage detection means detects the refrigerant leakage, the leaking refrigerant is stirred and diffused by a fan and the like to prevent the leaking refrigerant from residing and forming a flammable area.
  • Patent Literature 2 A conventional air conditioner is described in JP-A-2002-61996 (Patent Literature 2) in consideration of a measure against refrigerant leakage.
  • a gas detector is provided to detect refrigerant leakage in a room in which an indoor unit is arranged.
  • An alert system provided to the indoor unit generates an alert in case of refrigerant leakage. Then, a compressor and an outdoor blower fan are operated, an outdoor expansion valve is closed, a four-way switching valve is switched to a cooling operation, an indoor expansion valve is opened, and an outdoor unit collects refrigerant.
  • Patent Literature 1 JP-A-H11-37619
  • Patent Literature 2 JP-A-2002-61996
  • Patent Literature 1 since a hydrocarbon natural refrigerant is used as a refrigerant for the air conditioner, the global warming potential (GWP) is small. However, the hydrocarbon natural refrigerant has a strong flammability, and is therefore difficult to use as a refrigerant for air conditioners.
  • GWP global warming potential
  • Patent Literature 2 use of a refrigerant having a low global warming potential (GWP) is not taken into consideration.
  • GWP global warming potential
  • refrigerants having low global warming potentials refrigerants having low global warming potentials (GWP)
  • a refrigerant such as HFO1234yf and HFO1234ze have low densities and large volumes in vapor condition.
  • the refrigerants HFO1234yf and HFO1234ze have low densities and large volumes in vapor condition.
  • the refrigerant pressure loss on the low pressure side of the air conditioner increases (for example, three times or more when compared to R410A under the same condition) to increase power consumption of the compressor of the air conditioner.
  • GWP global warming potential
  • each of these refrigerants (HFO01234yf, HFO1234ze, and R32) is flammable while having low flammability (a refrigerant having a lower flammability than those of hydrocarbon refrigerants is hereinafter called a slightly flammable refrigerant).
  • Patent Literatures 1 and 2 describe measures against refrigerant leakage when the leakage is detected.
  • a refrigerant leakage detector is needed to be provided to each of the outdoor unit and indoor unit to detect leakage of a flammable or slightly flammable refrigerant and to prevent the fire. There is therefore also a problem that cost increases.
  • An object of the present invention is to obtain an air conditioner able to avoid the risk of fire and able to have a reduced number of refrigerant leakage detectors while using a refrigerant having a low global warming potential (GWP).
  • GWP global warming potential
  • an air conditioner of the present invention is provided with a heat source unit configured so as to use a flammable refrigerant having a low global warming potential, and configured by housing, inside a case, refrigeration cycle components such as a heat exchanger in which the refrigerant flows, an electric part box in which electric parts and the like are housed, and a blower driven by a motor. Airflow is formed by the blower in the case.
  • the refrigeration cycle components in which the refrigerant flows are arranged in the airflow in the case.
  • the electric part box and the electric parts such as the motor of the blower are arranged upstream from the refrigeration cycle components in the airflow.
  • an air conditioner able to avoid the risk of fire and able to have a reduced number of refrigerant leakage detectors while using a refrigerant having a low global warming potential (GWP) is obtained.
  • GWP global warming potential
  • FIG. 1 is a schematic block diagram explaining Embodiment 1 of an air conditioner of the present invention
  • FIG. 2 is a block diagram of a refrigeration cycle of the air conditioner illustrated in FIG. 1 ;
  • FIG. 3 is a top view illustrating a ceiling embedded type heat source unit in Embodiment 1 of the present invention.
  • FIG. 4 is a perspective view explaining an example of a ceiling embedded type heat source unit as a conventional air conditioner.
  • FIG. 5 is a top view explaining airflow of in the ceiling embedded type heat source unit illustrated in FIG. 4 .
  • FIG. 1 is a schematic block diagram explaining Embodiment 1 of the air conditioner of the present invention.
  • FIG. 2 is a block diagram of a refrigeration cycle of the air conditioner of FIG. 1 .
  • FIG. 3 is a top view of a ceiling embedded type heat source unit in Embodiment 1 of the present invention.
  • An example of a conventional air conditioner also is explained using FIGS. 4 and 5 for comparison.
  • the present embodiment explains an example of an air conditioner using HFO1234yf or HFO1234ze, which are slightly flammable refrigerants (for example, slightly flammable refrigerants having burning velocity of 10cm/s or less).
  • the slightly flammable refrigerants are less flammable than hydrocarbon refrigerants such as propane and isobutane, which are flammable refrigerants.
  • Refrigerants having relatively low global warming potentials (GWPs) include R32, as described above.
  • GWPs global warming potentials
  • the heat source unit is a ceiling embedded type heat source unit that is arranged to a ceiling portion and the like in a building to shorten the distance between the heat source unit and an indoor unit (namely, the length of refrigerant piping) and that introduces outside air to perform heat exchange.
  • this specific configuration is explained using FIG. 1 .
  • FIG. 1 is a schematic block diagram explaining an example of an arrangement of the air conditioner of the present embodiment having the ceiling embedded type heat source unit.
  • FIG. 1 illustrates a building 1 and a heat source unit 2 that includes, inside a case, refrigeration cycle components such as a heat exchanger in which the refrigerant flows, an electric part box in which electric parts and the like are housed, and a blower driven by a motor.
  • this heat source unit 2 is the so-called ceiling embedded type heat source unit arranged to a ceiling portion 1 a (attic) in the building 1 .
  • An indoor unit 3 conditions air in a room 1 b .
  • This indoor unit 3 and heat source unit 2 are connected to one another by refrigerant pipes 4 and 5 ( 4 : gas side refrigerant pipe, 5 : liquid side refrigerant pipe).
  • the heat source unit 2 is configured so as to draw outdoor air as illustrated by an arrow 6 , exchange heat between the outdoor air and refrigerant, and blow the air after this heat exchange out of the room as illustrated by an arrow 7 .
  • the indoor unit 3 draws the air in the room 1 b as illustrated by an arrow 8 .
  • a heat exchanger provided inside the indoor unit 3 exchanges heat between the indoor air and refrigerant and blows the air cooled (in cooling) or heated (in heating) after the heat exchange into the room as illustrated by an arrow 9 to condition the air in the room 1 b in which an occupant 10 is present.
  • the heat source unit 2 is often arranged, e.g., to the rooftop of the building 1 or outside a wall of the building 1 as an outdoor unit, but arranged to a ceiling portion (an attic 1 a in the present embodiment) nearer to the indoor unit 3 than to the rooftop and outside the building as the ceiling embedded type heat source unit 2 to enable the refrigerant pipes 4 and 5 that connect the indoor unit 3 and heat source unit 2 to one another to be shorter than those for the heat source unit arranged outside the room.
  • the refrigerant pipes 4 and 5 that connect the heat source unit 2 and indoor unit 3 to one another are 10 m or less in length.
  • the refrigerant pipes 4 and 5 can be made short to enable the refrigerant pressure loss to be reduced on the low pressure side of the compressor of the air conditioner.
  • the refrigerants HFO1234yf and HFO1234ze have low densities and large volumes in vapor state, the refrigerant pressure loss on the low pressure side easily becomes high.
  • the refrigerant pressure loss on the low pressure side can be reduced, and power consumption of the compressor can be reduced. Even when using HFO1234yf and HFO1234ze, which are refrigerants having low global warming potentials, an efficient air conditioner can be obtained.
  • FIG. 1 has been explained using the heat source unit 2 in direct contact with the air outside the building 1 .
  • the heat source unit 2 is provided inside the building, e.g., o further shorten the distance to the indoor unit 3 .
  • the outdoor air may be introduced to the heat source unit 2 via an air duct.
  • the lengths of the refrigerant pipes 4 and 5 that connect the heat source unit 2 and indoor unit 3 to one another can be easily 10 m or less.
  • the refrigerant pressure loss on the low pressure side can be reduced easily even when HFO1234yf and HFO1234ze are used as the refrigerant.
  • FIG. 2 is a block diagram of the refrigeration cycle of the air conditioner illustrated in FIG. 1 , and illustrates the heat source unit 2 and indoor unit 3 .
  • These heat source unit 2 and indoor unit 3 are connected by a gas side refrigerant pipe (gas side connection pipe) 4 and a liquid side refrigerant pipe (liquid side connection pipe) 5 .
  • a compressor 20 In the heat source unit 2 , a compressor 20 , a four-way switching valve 21 , a heat source side heat exchanger 22 , and an expansion device 23 are sequentially connected by the refrigerant piping.
  • a blower 24 draws outdoor air from outside the building and blows the air to the heat source side heat exchanger 22 .
  • the heat source side heat exchanger 22 exchanges heat between the drawn outdoor air and the refrigerant that flows inside the refrigerant piping of the heat exchanger 22 to condense the refrigerant (in cooling) and evaporate the refrigerant (in heating).
  • the indoor unit 3 is configured to connect the indoor heat exchanger 30 and expansion device 31 by the refrigerant piping.
  • a blower 32 draws indoor air and blows the air to the indoor heat exchanger 30 .
  • the indoor heat exchanger 30 exchanges heat between the drawn indoor air and the refrigerant flowing in the refrigerant piping of the heat exchanger 30 to evaporate (in cooling) and condense (in heating) the refrigerant.
  • cool air and warm air can be supplied into the room to condition air in the room.
  • the present embodiment describes that a refrigerant leakage detector (refrigerant leakage detection means) 33 is arranged in the indoor unit 3 and can detect refrigerant leakage immediately when the leakage occurs.
  • a refrigerant leakage detector (refrigerant leakage detection means) 33 is arranged in the indoor unit 3 and can detect refrigerant leakage immediately when the leakage occurs.
  • This refrigerant leakage detector 33 may be arranged outside the indoor unit 3 or in the room in which the indoor unit 3 is arranged.
  • the heat source unit 2 and indoor unit 3 are connected to one another by the gas side refrigerant pipe 4 and liquid side refrigerant pipe 5 .
  • a gas side prevention valve 25 is provided to the gas side refrigerant pipe 4 .
  • a liquid side prevention valve 26 is provided to the liquid side refrigerant pipe 5 .
  • these prevention valves 25 and 26 are provided to the heat source unit 2 side.
  • an arrow A in the heat source unit 2 illustrates a flow of the refrigerant in heating
  • an arrow B illustrates a flow of the refrigerant in cooling.
  • FIG. 3 Before that, a configuration of a conventional ceiling embedded type heat source unit is explained using FIGS. 4 and 5 for comparison.
  • FIG. 4 and 5 Before that, a configuration of a conventional ceiling embedded type heat source unit is explained using FIGS. 4 and 5 for comparison.
  • FIG. 4 is a perspective view explaining an example of a ceiling embedded type heat source unit as the conventional air conditioner.
  • FIG. 5 is a top view explaining airflow in the ceiling embedded type heat source unit illustrated in FIG. 4 .
  • FIG. 4 illustrates the conventional ceiling embedded type heat source unit 2 corresponding to the ceiling embedded type heat source unit 2 illustrated in FIG. 1 , and illustrates a case 2 a.
  • the inside of the case 2 a is partitioned to an upstream space 2 c and a downstream space 2 d by a partition plate 2 b.
  • An air inlet 2 e is to draw outdoor air (open air).
  • An air outlet 2 f is to blow the heat-exchanged air out of the downstream space 2 d to outside the building.
  • the upstream space 2 c includes the heat exchanger (heat source side heat exchanger) 22 that exchanges heat between the refrigerant flowing in a heat transfer tube and the outdoor air introduced from the air inlet 2 e , a blower 24 that draws the outdoor air to supply the outdoor air to the heat exchanger 22 , the compressor 20 that compresses the refrigerant, and a receiver 27 that receives an excess refrigerant condensed by the heat exchanger 22 and the like.
  • a motor 24 a is to drive the blower 24 .
  • the downstream space 2 d houses an electric part box 28 that houses electric parts such as a control substrate mounting electronic parts and a terminal base.
  • the conventional the heat source unit 2 uses R407C, R410A, and the like as a refrigerant.
  • the compressor 20 , heat exchanger 22 , and receiver 27 are refrigeration cycle components in which the refrigerant flows.
  • the four-way switching valve 21 and expansion device 23 illustrated in FIG. 2 but not illustrated in FIG. 4 are also refrigeration cycle components in which the refrigerant flows.
  • FIG. 5 an arrow C illustrates airflow within the case 2 a of the heat source unit 2 .
  • the refrigeration cycle components such as the compressor 20 , heat exchanger 22 , and receiver 27 are arranged upstream from airflow C formed by the blower 24 , and the blower 24 and electric part box 28 are arranged downstream from the airflow C. Therefore, when the refrigerant leaks from any of these refrigeration cycle components, the leaking refrigerant flows along the airflow C.
  • the device arrangement inside the ceiling embedded type heat source unit 2 is configured as illustrated in FIG. 3 .
  • the configuration corresponding to the conventional ceiling embedded type heat source unit illustrated in FIGS. 4 and FIG. 5 is given the same reference numerals, the overlapped portions are not explained, and only the different portions are explained.
  • the drawn airflow of the outdoor air illustrated by an outline arrow 6 flows from the air inlet 2 e into the case 2 a, and flows inside the case 2 a and is blown from an air outlet 2 f to outside the building as illustrated by the airflow C.
  • the refrigeration cycle components such as the compressor 20 , heat exchanger 22 , and receiver 27 in which the refrigerant flows are arranged to the downstream space 2 d in the case 2 a , and the blower 24 and electric part box 28 are arranged to the upstream space 2 c in the case 2 a.
  • the refrigeration cycle components are downstream from the airflow and the electric part box 28 and blower 24 are arranged upstream from the refrigeration cycle components in the airflow.
  • the leaking refrigerant can be entrained in the airflow C and flown out of the building without contacting the electric part box 28 and blower 24 . Therefore, even when a slightly flammable or flammable refrigerant leaks from the refrigeration cycle components, this refrigerant can be prevented from contacting the electric components in the electric part box 28 and the electric components such as the motor 24 a of the blower 24 , the electric components being capable of being ignition sources. Then, the risk of combustion can be avoided.
  • HFO1234yf, HFO1234ze, and the like which are slightly flammable refrigerants
  • the heat source unit is the ceiling embedded type heat source unit
  • the following risks are present incase of refrigerant leakage of the heat source unit. These include the risk of combustion inside the heat source unit, the risk of combustion in the building when the refrigerant may flow into the building such as the attic in the event of the refrigerant leakage from the heat source unit, and the risk of oxygen deficiency when the leaking refrigerant enters the room.
  • the electric part box 28 and blower 24 are arranged upstream from the refrigeration cycle components in the airflow.
  • the leaking refrigerant can be discharged out of the building without contacting the electric part box 28 and blower 24 .
  • the advantageous effect that combustion and oxygen deficiency due to refrigerant leakage from the ceiling embedded type heat source unit is preventable can be obtained.
  • the refrigerant leakage detector 33 is provided to the indoor unit to deal with refrigerant leakage from the indoor unit, the risks of combustion and oxygen deficiency can be avoided. That is, in the present embodiment, as illustrated in FIG. 2 , the refrigerant leakage detector 33 is provided to the indoor unit 3 . Thus, when refrigerant leakage occurs in the indoor unit 3 , the refrigerant leakage detector 33 can detect the leakage, and generate an alert and the like to enable prevention of combustion and oxygen deficiency caused by deposition of the refrigerant in the indoor unit 3 and room 1 b.
  • the refrigerant detector is expensive.
  • the combustion and oxygen deficiency caused by the refrigerant leakage from the heat source unit can be prevented. Therefore, it is not necessary to provide a refrigerant leakage detector in the heat source unit. Therefore, the number of expensive refrigerant detectors can be reduced and an inexpensive air conditioner can be obtained accordingly. That is, in the present embodiment, since the heat source unit 2 is configured as explained in FIG. 3 , it is not necessary to arrange a refrigerant leakage detector in the heat source unit 2 . Therefore, the number of expensive refrigerant detectors can be reduced, and an inexpensive air conditioner can be realized by suppressing increase in cost.
  • HFO1234yf and HFO1234ze which are refrigerants having low global warming potentials (GWPs)
  • GWPs global warming potentials
  • the heat source unit 2 is the ceiling embedded type heat source unit in the present embodiment to handle the problem
  • the length of the refrigerant piping that connects the indoor unit and heat source unit to one another can be short, for example, 10 m or less. Therefore, while using the refrigerant such as HFO1234yf and HFO1234ze, having low densities and large volumes in vapor state, the refrigerant pressure loss on the low pressure side of the air conditioner can be reduced. As a result, an efficient air conditioner that can also reduce power consumption can be obtained.
  • the blower 24 of the ceiling embedded type heat source unit 2 is driven periodically even while the air conditioner does not operate. That is, even during shutdown of the air conditioner, the blower 24 is rotated periodically, for example, for several seconds to several minutes once to several times a day by use of a timer and the like to generate the airflow C in the case 2 a of the heat source unit 2 .
  • the leaking refrigerant can be discharged out of the building periodically. As a result, gradual deposition of the leaking refrigerant in the case 2 a to increase the risk of combustion can be prevented.
  • the slightly flammable refrigerant remains in the heat source unit 2 and increases in density in case of the refrigerant leakage to increase the risk of fire.
  • the leaking refrigerant moves from the heat source unit 2 into the room 1 b (see FIG. 1 ) through the attic and the like, the risks of combustion and oxygen deficiency arise in the room.
  • the blower 24 is periodically driven even during shutdown of the air conditioner as mentioned above.
  • the leaking refrigerant can be prevented from remaining in the heat source unit 2 to increase in density and from entering the room 1 b , the combustion and oxygen deficiency due to the leakage of the slightly flammable refrigerant can be prevented certainly.
  • the risk of fire can be avoided while using the slightly flammable refrigerant having a low global warming potential (GWP), and cost reduction can be achieved because the number of the refrigerant leakage detectors can be reduced. Since the refrigerant pressure loss on the low pressure side of the air conditioner can also be reduced, an advantageous effect that the efficient air conditioner can be obtained is also obtained.
  • GWP global warming potential
  • the present invention is not limited to the above embodiment, but includes various modifications.
  • the above embodiment explains the example using HFO1234yf and HFO1234ze, which have low global warming potentials (GWP) and are slightly flammable, as the refrigerant, but is applicable also when R32, which has a relatively small GWP and is slightly flammable, is used or when other refrigerants and mixed refrigerants having a similar property are used.
  • the heat source unit has been explained as the ceiling embedded type heat source unit.
  • the heat source unit is not limited to a ceiling embedded type.
  • the technical concept of the present invention is also applicable to an outdoor unit arranged outside a building. Further, the above embodiment has been explained in detail for understanding the present invention, but is not necessarily limited to having all the explained configurations.

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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)
  • Air Conditioning Control Device (AREA)
  • Other Air-Conditioning Systems (AREA)
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US15/117,240 2014-02-25 2014-10-27 Air conditioner Abandoned US20160348927A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2014034164A JP6177158B2 (ja) 2014-02-25 2014-02-25 空気調和機
JP2014-034164 2014-02-25
PCT/JP2014/078436 WO2015129099A1 (fr) 2014-02-25 2014-10-27 Climatiseur

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US20160348927A1 true US20160348927A1 (en) 2016-12-01

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EP3112768B1 (fr) 2020-06-17
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WO2015129099A1 (fr) 2015-09-03
EP3112768A1 (fr) 2017-01-04
CN106133452B (zh) 2019-11-05
JP2015158338A (ja) 2015-09-03
CN106133452A (zh) 2016-11-16

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