WO2014128971A1 - Appareil de conditionnement d'air - Google Patents

Appareil de conditionnement d'air Download PDF

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Publication number
WO2014128971A1
WO2014128971A1 PCT/JP2013/054789 JP2013054789W WO2014128971A1 WO 2014128971 A1 WO2014128971 A1 WO 2014128971A1 JP 2013054789 W JP2013054789 W JP 2013054789W WO 2014128971 A1 WO2014128971 A1 WO 2014128971A1
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Prior art keywords
heat medium
heat
refrigerant
heat exchanger
switching device
Prior art date
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PCT/JP2013/054789
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English (en)
Japanese (ja)
Inventor
祐治 本村
嶋本　大祐
孝好 本多
森本　修
浩二 西岡
小野　達生
Original Assignee
三菱電機株式会社
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Priority to JP2015501233A priority Critical patent/JP6062030B2/ja
Priority to PCT/JP2013/054789 priority patent/WO2014128971A1/fr
Publication of WO2014128971A1 publication Critical patent/WO2014128971A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/003—Indoor unit with water as a heat sink or heat source
    • 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
    • F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02732—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using two three-way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0312—Pressure 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
    • F25B2313/0314—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
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/19—Calculation of parameters
    • 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
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • 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
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
    • 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
    • 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
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21161—Temperatures of a condenser of the fluid heated by the condenser
    • 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
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21162—Temperatures of a condenser of the refrigerant at the inlet of the condenser
    • 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
    • F25B2700/2116—Temperatures of a condenser
    • F25B2700/21163—Temperatures of a condenser of the refrigerant at the outlet of the condenser
    • 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
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
    • F25B2700/21173—Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet
    • 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
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21174—Temperatures of an evaporator of the refrigerant at the inlet of the evaporator
    • 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
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21175—Temperatures of an evaporator of the refrigerant at the outlet of the evaporator

Definitions

  • the present invention relates to an air conditioner applied to, for example, a building multi air conditioner.
  • a refrigerant is circulated between, for example, an outdoor unit that is a heat source device arranged outside a building and an indoor unit arranged inside a building.
  • the refrigerant coolant thermally radiated and absorbed heat, and air-conditioning object space was cooled or heated with the air heated and cooled.
  • an HFC (hydrofluorocarbon) refrigerant is often used.
  • a natural refrigerant such as carbon dioxide (CO 2 ) has been proposed.
  • an air conditioner called a chiller
  • heat or heat is generated by a heat source device arranged outside the building.
  • water, antifreeze, etc. are heated and cooled by a heat exchanger arranged in the heat source machine, and this is transferred to a fan coil unit, a panel heater, etc., which are indoor units, for cooling or heating (for example, Patent Documents) 1).
  • a waste heat recovery type chiller which is connected to four water pipes between the heat source unit and the indoor unit, supplies cooled and heated water at the same time, and can freely select cooling or heating in the indoor unit (For example, refer to Patent Document 2).
  • an air conditioner such as a multi air conditioner for buildings
  • a refrigerant such as water is circulated from the outdoor unit to the repeater and a heat medium such as water is circulated from the repeater to the indoor unit.
  • a heat medium such as water is circulated from the repeater to the indoor unit.
  • an air conditioner that reduces the conveyance power of the heat medium while circulating (see, for example, Patent Document 5).
  • Japanese Patent Laying-Open No. 2005-140444 page 4, FIG. 1, etc.
  • JP-A-5-280818 (4th, 5th page, FIG. 1 etc.
  • Japanese Patent Laid-Open No. 2001-289465 pages 5 to 8, FIG. 1, FIG. 2, etc.
  • JP 2003-343936 A (Page 5, FIG. 1)
  • WO 10/049998 (3rd page, FIG. 1 etc.)
  • the heat medium transport device when the heat medium transport device does not operate due to some problem, in the heat medium cooled by heat exchange with the refrigerant, the heat medium cooled with respect to the indoor unit that performs the cooling operation among the connected indoor units Cannot be transported. Similarly, when the heat medium transport device does not operate due to some problem, in the heat medium heated by heat exchange with the refrigerant, the heat medium heated to the indoor unit that performs the heating operation among the connected indoor units Cannot be transported. As a result, in the indoor unit that performs the cooling operation and the indoor unit that performs the heating operation, the operation cannot be performed, and the comfort of the user is impaired.
  • the air conditioner even if the heat medium transport device does not operate due to some problem, if the cooling operation and the heating operation can be controlled, the operation of the air conditioner can be continued and the user can be performed. Comfort can also be maintained.
  • the present invention has been made in order to solve the above-described problems, and includes a plurality of heat medium transfer devices, and an indoor unit connected with a heat medium that exchanges heat with refrigerant as much as possible. It aims at providing the air conditioning apparatus which can maintain a user's comfort by continuing cooling operation or heating operation by conveying.
  • An air conditioner includes a compressor, a heat source side heat exchanger, a plurality of expansion devices, a refrigerant side flow path of a plurality of heat exchangers between heat media, and a plurality of refrigerant flow switching devices that switch a refrigerant circulation path.
  • a refrigerant circulation circuit that circulates the heat source side refrigerant by connecting with a refrigerant pipe, a plurality of heat medium transfer devices provided corresponding to each of the plurality of heat exchangers between heat media, and a plurality of use side heat exchangers
  • a heat medium circulation circuit that circulates the heat medium by connecting the heat medium side flow paths of the plurality of heat medium heat exchangers with a heat medium transport pipe, and the heat source in the heat medium heat exchanger
  • An air conditioner for exchanging heat between the side refrigerant and the heat medium, and when one of the plurality of heat medium transport devices does not operate, the remaining of the plurality of heat medium transport devices is used. Conveys heat medium to each of multiple user-side heat exchangers Is shall.
  • the air-conditioning apparatus uses a heat medium that has exchanged heat with a refrigerant using another heat medium transport device even when one of the heat medium transport devices does not operate. Can be continuously conveyed. Therefore, according to the air conditioning apparatus according to the present invention, even if one of the heat medium transport devices does not operate, if another heat medium transport device is operable, the operation can be continuously performed. And maintain comfort.
  • FIG. 1 is a schematic diagram illustrating an installation example of an air conditioner according to an embodiment of the present invention. Based on FIG. 1, the installation example of an air conditioning apparatus is demonstrated.
  • This air conditioner uses a refrigeration cycle (refrigerant circulation circuit A, heat medium circulation circuit B) that circulates refrigerant (heat source side refrigerant, heat medium) so that each indoor unit can be in the cooling mode or the heating mode as an operation mode. You can choose freely.
  • FIG. 1 schematically shows an entire air conditioner connecting a plurality of indoor units 3.
  • the relationship of the size of each component may be different from the actual one.
  • the air-conditioning apparatus includes an outdoor unit (heat source unit) 1, a plurality of indoor units 3, and one relay interposed between the outdoor unit 1 and the indoor unit 3. And a unit 2.
  • the relay unit 2 performs heat exchange between the heat source side refrigerant and the heat medium.
  • the outdoor unit 1 and the relay unit 2 are connected by a refrigerant pipe 4 that conducts the heat source side refrigerant.
  • the relay unit 2 and the indoor unit 3 are connected by a pipe (heat medium transport pipe) 5 that conducts the heat medium.
  • the cold or warm heat generated by the outdoor unit 1 is delivered to the indoor unit 3 via the relay unit 2.
  • the outdoor unit 1 is usually disposed in an outdoor space 6 that is a space (for example, a rooftop) outside a building 9 such as a building, and supplies cold or hot energy to the indoor unit 3 via the relay unit 2. .
  • the indoor unit 3 is disposed at a position where cooling air or heating air can be supplied to the indoor space 7 that is a space (for example, a living room) inside the building 9, and the cooling air is supplied to the indoor space 7 that is the air-conditioning target space. Alternatively, heating air is supplied.
  • the relay unit 2 is configured as a separate housing from the outdoor unit 1 and the indoor unit 3 so as to be installed at a position different from the outdoor space 6 and the indoor space 7.
  • the refrigerant pipe 4 and the pipe 5 are respectively connected to transmit cold heat or hot heat supplied from the outdoor unit 1 to the indoor unit 3.
  • the heat source side refrigerant is conveyed from the outdoor unit 1 to the relay unit 2 through the refrigerant pipe 4.
  • the transported heat source side refrigerant exchanges heat with the heat medium in the heat exchanger related to heat medium in the relay unit 2 (heat exchanger 25 described later), and heats or cools the heat medium. That is, hot water or cold water is produced by the heat exchanger between heat media.
  • the hot water or cold water produced by the relay unit 2 is transported to the indoor unit 3 through the pipe 5 by a heat medium transport device (a pump 31 described later), and the indoor unit 3 performs heating operation (warm water).
  • the operation state may be as long as it is necessary) or a cooling operation (as long as the operation state requires cold water).
  • heat source side refrigerant examples include single refrigerants such as R-22, R-134a, and R-32, pseudo-azeotropic mixed refrigerants such as R-410A and R-404A, and non-azeotropic mixed refrigerants such as R-407C.
  • a refrigerant or mixture thereof containing a double bond in the chemical formula and having a relatively low global warming coefficient such as CF 3 CF ⁇ CH 2 , or a natural refrigerant such as CO 2 or propane can be used.
  • heat medium for example, water, antifreeze, a mixture of water and antifreeze, a mixture of water and an additive having a high anticorrosive effect, or the like can be used.
  • the outdoor unit 1 and the relay unit 2 use two refrigerant pipes 4, and the relay unit 2 and each indoor unit 3 have two. These pipes 5 are connected to each other.
  • each unit outdoor unit 1, indoor unit 3, and relay unit 2 using two pipes (refrigerant pipe 4, pipe 5). Construction is easy.
  • the relay unit 2 is installed in a space such as the back of the ceiling (hereinafter simply referred to as a space 8) that is inside the building 9 but is different from the indoor space 7.
  • a space 8 such as the back of the ceiling (hereinafter simply referred to as a space 8) that is inside the building 9 but is different from the indoor space 7.
  • the relay unit 2 may be installed anywhere as long as it is outside the ceiling or other than the living space and has some ventilation with the outside. It can also be installed in a space that is ventilated. Further, the relay unit 2 can be installed in the vicinity of the outdoor unit 1. However, it should be noted that if the distance from the relay unit 2 to the indoor unit 3 is too long, the transfer power of the heat medium becomes considerably large, so that the effect of energy saving is reduced.
  • FIG. 1 shows an example in which the outdoor unit 1 is installed in the outdoor space 6, but the present invention is not limited to this.
  • the outdoor unit 1 may be installed in an enclosed space such as a machine room with a ventilation opening. If the waste heat can be exhausted outside the building 9 by an exhaust duct, the outdoor unit 1 may be installed inside the building 9. It may be installed, or may be installed inside the building 9 when the water-cooled outdoor unit 1 is used. Even if the outdoor unit 1 is installed in such a place, no particular problem occurs.
  • the indoor unit 3 is a ceiling cassette type
  • the present invention is not limited to this, and the indoor unit 3 is directly or directly connected to the indoor space 7 such as a ceiling embedded type or a ceiling suspended type.
  • the air for heating or the air for cooling can be blown out, any kind may be used.
  • the number of connected outdoor units 1, indoor units 3, and relay units 2 is not limited to the number shown in FIG. 1, but according to the building 9 in which the air conditioner according to the present embodiment is installed. What is necessary is just to determine the number.
  • the plurality of relay units 2 When a plurality of relay units 2 are connected to one outdoor unit 1, the plurality of relay units 2 may be installed in a shared space in a building such as a building or in a space such as a ceiling. it can. By doing so, an air-conditioning load can be covered with the heat exchanger between heat media in each relay unit 2.
  • the indoor unit 3 can be installed at a distance or height within the allowable transfer range of the heat medium transfer device in each relay unit 2, and can be arranged on the entire building such as a building. .
  • FIG. 2 is a schematic circuit configuration diagram showing an example of a circuit configuration of the air conditioning apparatus according to the present embodiment (hereinafter referred to as the air conditioning apparatus 100).
  • the structure of the air conditioning apparatus 100 ie, the effect
  • the outdoor unit 1 and the relay unit 2 include a heat exchanger related to heat medium (refrigerant-water heat exchanger) 25 a and a heat exchanger related to heat medium (refrigerant—) provided in the relay unit 2.
  • the refrigerant pipe 4 is connected via a water heat exchanger 25b.
  • the relay unit 2 and the indoor unit 3 are connected by the piping 5 through the heat exchanger related to heat medium 25a and the heat exchanger related to heat medium 25b.
  • Outdoor unit 1 In the outdoor unit 1, a compressor 10, a first refrigerant flow switching device 11 such as a four-way valve, a heat source side heat exchanger 12, and an accumulator 19 are connected and connected in series through a refrigerant pipe 4. Yes.
  • the outdoor unit 1 is also provided with a refrigerant connection pipe 4a, a refrigerant connection pipe 4b, a check valve 13a, a check valve 13b, a check valve 13c, and a check valve 13d.
  • relay connection pipe 4a, refrigerant connection pipe 4b, check valve 13a, check valve 13b, check valve 13c, and check valve 13d are provided.
  • the flow of the heat source side refrigerant flowing into the unit 2 can be in a certain direction.
  • the compressor 10 sucks the heat source side refrigerant, compresses the heat source side refrigerant, and transfers it to the refrigerant circulation circuit A in a high temperature / high pressure state. Good.
  • the first refrigerant flow switching device 11 has a flow of the heat source side refrigerant during heating operation (in the heating only operation mode and heating main operation mode) and a cooling operation (in the cooling only operation mode and cooling main operation mode). The flow of the heat source side refrigerant is switched.
  • the heat source side heat exchanger 12 functions as an evaporator during heating operation, functions as a condenser (or radiator) during cooling operation, and fluid such as air and a heat source side refrigerant supplied from a blower such as a fan (not shown). Heat exchange is performed between the refrigerant and the heat source side refrigerant to evaporate gas or condensate liquid.
  • the accumulator 19 is provided on the suction side of the compressor 10 and stores excess refrigerant due to a difference between the heating operation and the cooling operation, or excess refrigerant with respect to a transient change in operation.
  • the check valve 13c is provided in the refrigerant pipe 4 between the relay unit 2 and the first refrigerant flow switching device 11, and the heat source side refrigerant is only in a predetermined direction (direction from the relay unit 2 to the outdoor unit 1). It allows flow.
  • the check valve 13a is provided in the refrigerant pipe 4 between the heat source side heat exchanger 12 and the relay unit 2, and flows the heat source side refrigerant only in a predetermined direction (direction from the outdoor unit 1 to the relay unit 2). It is acceptable.
  • the check valve 13d is provided in the refrigerant connection pipe 4a and causes the heat source side refrigerant discharged from the compressor 10 to flow through the relay unit 2 during the heating operation.
  • the check valve 13b is provided in the refrigerant connection pipe 4b, and causes the heat source side refrigerant returned from the relay unit 2 during the heating operation to flow to the suction side of the compressor 10.
  • the refrigerant connection pipe 4 a includes a refrigerant pipe 4 between the first refrigerant flow switching device 11 and the check valve 13 c, and a refrigerant pipe 4 between the check valve 13 a and the relay unit 2.
  • the refrigerant connection pipe 4b includes a refrigerant pipe 4 between the check valve 13c and the relay unit 2, a refrigerant pipe 4 between the heat source side heat exchanger 12 and the check valve 13a, Are connected.
  • FIG. 2 shows an example in which the refrigerant connection pipe 4a, the refrigerant connection pipe 4b, the check valve 13a, the check valve 13b, the check valve 13c, and the check valve 13d are provided.
  • the present invention is not limited to this, and these are not necessarily provided.
  • Each indoor unit 3 is equipped with a use side heat exchanger 35.
  • the use side heat exchanger 35 is connected to the heat medium flow control device 34 and the second heat medium flow switching device 33 of the relay unit 2 by the pipe 5.
  • the use side heat exchanger 35 exchanges heat between air supplied from a blower such as a fan (not shown) and a heat medium, and generates heating air or cooling air to be supplied to the indoor space 7. To do.
  • FIG. 2 shows an example in which four indoor units 3 are connected to the relay unit 2, which are illustrated as an indoor unit 3 a, an indoor unit 3 b, an indoor unit 3 c, and an indoor unit 3 d from the upper side of the drawing.
  • the use side heat exchanger 35 also has a use side heat exchanger 35a, a use side heat exchanger 35b, a use side heat exchanger 35c, and a use side heat exchanger from the upper side of the drawing. It is illustrated as 35d.
  • the number of indoor units 3 connected is not limited to the four shown in FIG.
  • the relay unit 2 includes at least two or more heat exchangers for heat medium 25, two expansion devices 26, two opening / closing devices (opening / closing device 27, opening / closing device 29), and two second refrigerant flow switching.
  • Device 28 two heat medium transfer devices (hereinafter referred to as pump 31), four first heat medium flow switching devices 32, four second heat medium flow switching devices 33, and four heat media A flow rate adjusting device 34 is mounted.
  • the two heat exchangers for heat medium 25 are provided with a condenser (when the heat is supplied to the indoor unit 3 in the heating operation).
  • a condenser when the heat is supplied to the indoor unit 3 in the heating operation.
  • the indoor unit 3 When supplying cold heat to the indoor unit 3 that is in the cooling operation as a radiator, it functions as an evaporator, performs heat exchange between the heat-source-side refrigerant and the heat medium, and is generated by the outdoor unit 1
  • the cold heat or warm heat stored in the side refrigerant is transmitted to the heat medium.
  • the heat exchanger related to heat medium 25a is provided between the expansion device 26a and the second refrigerant flow switching device 28a in the refrigerant circuit A, and serves to cool the heat medium in the cooling / heating mixed operation mode.
  • the heat exchanger related to heat medium 25b is provided between the expansion device 26b and the second refrigerant flow switching device 28b in the refrigerant circulation circuit A, and serves to heat the heat medium in the cooling / heating mixed operation mode. Is.
  • the two expansion devices 26 have functions as pressure reducing valves and expansion valves, and expand the heat source side refrigerant by reducing the pressure.
  • the expansion device 26a is provided on the upstream side of the heat exchanger related to heat medium 25a in the flow of the heat source side refrigerant during the cooling operation.
  • the expansion device 26b is provided on the upstream side of the heat exchanger related to heat medium 25b in the flow of the heat source side refrigerant during the cooling operation.
  • the two expansion devices 26 may be constituted by devices whose opening degree can be variably controlled, for example, electronic expansion valves.
  • the two opening / closing devices are configured by electromagnetic valves or the like that can be opened and closed by energization, and open / close the refrigerant pipe 4. That is, the opening and closing of the two opening / closing devices is controlled according to the operation mode, and the flow path of the heat source side refrigerant is switched.
  • the opening / closing device 27 is provided in the refrigerant pipe 4 on the inlet side of the heat-source-side refrigerant (the refrigerant pipe 4 located at the lowest level in the drawing among the refrigerant pipes 4 connecting the outdoor unit 1 and the relay unit 2).
  • the opening / closing device 29 is provided in a pipe (bypass pipe 20) connecting the refrigerant pipe 4 on the inlet side of the heat source side refrigerant and the refrigerant pipe 4 on the outlet side.
  • the opening / closing device 27 and the opening / closing device 29 may be any devices that can switch the refrigerant flow path.
  • an electronic expansion valve or the like that can variably control the opening degree may be used.
  • the two second refrigerant flow switching devices 28 are constituted by, for example, a four-way valve or the like, and the heat exchanger related to heat medium according to the operation mode.
  • the flow of the heat source side refrigerant is switched so that 25 acts as a condenser or an evaporator.
  • the second refrigerant flow switching device 28a is provided on the downstream side of the heat exchanger related to heat medium 25a in the flow of the heat source side refrigerant during the cooling operation.
  • the second refrigerant flow switching device 28b is provided on the downstream side of the heat exchanger related to heat medium 25b in the flow of the heat source side refrigerant in the cooling only operation mode.
  • the two pumps 31 (pump 31a and pump 31b) circulate the heat medium that conducts the pipe 5 to the heat medium circuit B.
  • the pump 31 a is provided in the pipe 5 between the heat exchanger related to heat medium 25 a and the second heat medium flow switching device 33.
  • the pump 31 b is provided in the pipe 5 between the heat exchanger related to heat medium 25 b and the second heat medium flow switching device 33.
  • the two pumps 31 may be configured by, for example, capacity-controllable pumps, and the flow rate thereof may be adjusted according to the load in the indoor unit 3.
  • the four first heat medium flow switching devices 32 are configured by three-way valves or the like, and heat the flow of the heat medium. Switching between the heat exchanger for medium 25a and the heat exchanger 25b for heat medium is performed.
  • the number of first heat medium flow switching devices 32 is set according to the number of indoor units 3 installed (here, four). In the first heat medium flow switching device 32, one of the three sides is in the heat exchanger 25a, one of the three is in the heat exchanger 25b, and one of the three is in the heat medium flow rate. Each is connected to the adjustment device 34 and provided on the outlet side of the heat medium flow path of the use side heat exchanger 35.
  • the switching of the heat medium flow path includes not only complete switching from one to the other but also partial switching from one to the other.
  • the four second heat medium flow switching devices 33 are configured by three-way valves or the like, and heat the flow of the heat medium. Switching between the heat exchanger for medium 25a and the heat exchanger 25b for heat medium is performed.
  • the second heat medium flow switching device 33 is provided in a number (four in this case) corresponding to the number of indoor units 3 installed.
  • one of the three heat transfer medium heat exchangers 25a, one of the three heat transfer medium heat exchangers 25b, and one of the three heat transfer side heats. Each is connected to the exchanger 35 and provided on the inlet side of the heat medium flow path of the use side heat exchanger 35.
  • the second heat medium flow switching device 33a, the second heat medium flow switching device 33b, the second heat medium flow switching device 33c, and the second heat medium flow switching are performed from the upper side of the drawing. Illustrated as device 33d.
  • the switching of the heat medium flow path includes not only complete switching from one to the other but also partial switching from one to the other.
  • the four heat medium flow control devices 34 are configured by two-way valves or the like that can control the opening area, and control the flow rate of the heat medium flowing through the pipe 5. To do.
  • the number of the heat medium flow control devices 34 is set according to the number of indoor units 3 installed (four in this case).
  • One of the heat medium flow control devices 34 is connected to the use side heat exchanger 35 and the other is connected to the first heat medium flow switching device 32, and is connected to the outlet side of the heat medium flow channel of the use side heat exchanger 35. Is provided.
  • the heat medium flow control device 34 adjusts the amount of the heat medium flowing into the indoor unit 3 according to the temperature of the heat medium flowing into the indoor unit 3 and the temperature of the heat medium flowing out, so that the optimum heat according to the indoor load is adjusted.
  • the medium amount can be provided to the indoor unit 3.
  • the heat medium flow rate adjustment device 34a, the heat medium flow rate adjustment device 34b, the heat medium flow rate adjustment device 34c, and the heat medium flow rate adjustment device 34d are illustrated from the upper side of the drawing.
  • the heat medium flow control device 34 may be provided on the inlet side of the heat medium flow path of the use side heat exchanger 35.
  • the heat medium flow control device 34 may be provided on the inlet side of the heat medium flow path of the use side heat exchanger 35 and between the second heat medium flow switching device 33 and the use side heat exchanger 35. Good.
  • the indoor unit 3 does not require a load such as stop or thermo OFF, the heat medium supply to the indoor unit 3 can be stopped by fully closing the heat medium flow control device 34.
  • the heat medium flow control device 34 may be omitted. Is possible.
  • the relay unit 2 is provided with a temperature sensor 40 (temperature sensor 40a, temperature sensor 40b) for detecting the temperature of the heat medium on the outlet side of the heat exchanger 25 between heat mediums.
  • Information (temperature information) detected by the temperature sensor 40 is sent to a control device 50 that performs overall control of the operation of the air conditioner 100, and the driving frequency of the compressor 10, the rotational speed of the blower (not shown), the first refrigerant flow It is used for control such as switching of the path switching device 11, driving frequency of the pump 31, switching of the second refrigerant flow switching device 28, switching of the flow path of the heat medium, adjustment of the heat medium flow rate of the indoor unit 3, etc. Become.
  • control device 50 is shown as an example in a state where it is mounted separately from each unit, the present invention is not limited to this. At least one of the outdoor unit 1, the indoor unit 3, and the relay unit 2, or Each unit may be mounted so as to be communicable.
  • the control device 50 is constituted by a microcomputer or the like, and based on detection information from various detection means and instructions from a remote controller, the driving frequency of the compressor 10, the rotational speed of the blower (including ON / OFF), the first 1 switching of the refrigerant flow switching device 11, driving of the pump 31, opening of the expansion device 26, opening and closing of the opening / closing devices (opening / closing device 27, opening / closing device 29), switching of the second refrigerant flow switching device 28, first heat
  • the actuators pump 31, first heat medium flow switching device 32, first, etc.
  • such as switching of the medium flow switching device 32, switching of the second heat medium flow switching device 33, and driving of the heat medium flow control device 34, etc. 2 heat medium flow path switching device 33, throttle device 26, second refrigerant flow path switching device 28 and the like are controlled, and each operation mode to be described later is executed.
  • the pipe 5 that conducts the heat medium is composed of one that is connected to the heat exchanger related to heat medium 25a and one that is connected to the heat exchanger related to heat medium 25b.
  • the pipe 5 is branched (here, four branches each) according to the number of indoor units 3 connected to the relay unit 2.
  • the pipe 5 is connected by a first heat medium flow switching device 32 and a second heat medium flow switching device 33. By controlling the first heat medium flow switching device 32 and the second heat medium flow switching device 33, the heat medium from the heat exchanger related to heat medium 25a flows into the use-side heat exchanger 35, or the heat medium Whether the heat medium from the intermediate heat exchanger 25b flows into the use side heat exchanger 35 is determined.
  • the compressor 10 In the air conditioner 100, the compressor 10, the first refrigerant flow switching device 11, the heat source side heat exchanger 12, the switching device 27, the switching device 29, the second refrigerant flow switching device 28, and heat exchange between heat media.
  • the refrigerant flow path, the expansion device 26 and the accumulator 19 of the container 25 are connected by the refrigerant pipe 4 to constitute the refrigerant circulation circuit A.
  • the switching device 33 is connected by the pipe 5 to constitute the heat medium circulation circuit B. That is, a plurality of use side heat exchangers 35 are connected in parallel to each of the heat exchangers 25 between heat mediums, and the heat medium circulation circuit B has a plurality of systems.
  • the outdoor unit 1 and the relay unit 2 are connected via the heat exchanger related to heat medium 25a and the heat exchanger related to heat medium 25b provided in the relay unit 2, and the relay unit 2 is connected.
  • the indoor unit 3 are also connected via the heat exchanger related to heat medium 25a and the heat exchanger related to heat medium 25b. That is, in the air conditioner 100, the heat source side refrigerant circulating in the refrigerant circuit A and the heat medium circulating in the heat medium circuit B exchange heat in the intermediate heat exchanger 25a and the intermediate heat exchanger 25b. It is like that.
  • the air conditioner 100 can realize an optimal cooling operation or heating operation according to the indoor load.
  • the air conditioner 100 can perform a cooling operation or a heating operation in the indoor unit 3 based on an instruction from each indoor unit 3. That is, the air conditioning apparatus 100 can perform the same operation for all the indoor units 3 and can perform different operations for each of the indoor units 3.
  • the operation mode executed by the air conditioner 100 includes a heating only operation mode in which all the driven indoor units 3 execute the heating operation, and a cooling only operation in which all the driven indoor units 3 execute the cooling operation.
  • each operation mode is demonstrated with the flow of the heat source side refrigerant
  • FIG. 3 is a refrigerant circuit diagram illustrating a refrigerant flow when the air-conditioning apparatus 100 is in the heating only operation mode.
  • the heating only operation mode will be described by taking as an example a case where a heating load is generated in all of the use side heat exchanger 35a to the use side heat exchanger 35d.
  • the piping represented by the thick line has shown the piping through which the heat source side refrigerant
  • the flow direction of the heat source side refrigerant is indicated by a solid line arrow, and the flow direction of the heat medium is indicated by a broken line arrow.
  • the first refrigerant flow switching device 11 is used as a relay unit without passing the heat source side refrigerant discharged from the compressor 10 through the heat source side heat exchanger 12.
  • Switch to 2 In the relay unit 2, the pump 31a and the pump 31b are driven, the heat medium flow control devices 34a to 34d are opened, and the heat medium heat exchanger 25a and the heat medium heat exchanger 25b are used respectively.
  • the heat medium circulates between the side heat exchanger 35a and the use side heat exchanger 35d.
  • the second refrigerant flow switching device 28a and the second refrigerant flow switching device 28b are switched to the heating side, the opening / closing device 27 is closed, and the opening / closing device 29 is open.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the first refrigerant flow switching device 11, conducts through the refrigerant connection pipe 4 a, passes through the check valve 13 d, and flows out of the outdoor unit 1.
  • the high-temperature and high-pressure gas refrigerant that has flowed out of the outdoor unit 1 flows into the relay unit 2 through the refrigerant pipe 4.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the relay unit 2 is branched and passes through the second refrigerant flow switching device 28a and the second refrigerant flow switching device 28b, and the heat exchanger related to heat medium 25a and heat between the heat media. It flows into each of the exchangers 25b.
  • the high-temperature and high-pressure gas refrigerant flowing into the heat exchanger related to heat medium 25a and the heat exchanger related to heat medium 25b is condensed and liquefied while dissipating heat to the heat medium circulating in the heat medium circuit B, and becomes a high-pressure liquid refrigerant. .
  • the liquid refrigerant flowing out of the heat exchanger related to heat medium 25a and the heat exchanger related to heat medium 25b is expanded by the expansion device 26a and the expansion device 26b to become a low-temperature, low-pressure two-phase refrigerant.
  • These two-phase refrigerants merge, flow out of the relay unit 2 through the opening / closing device 29, and flow into the outdoor unit 1 again through the refrigerant pipe 4.
  • the refrigerant that has flowed into the outdoor unit 1 is conducted through the refrigerant connection pipe 4b, passes through the check valve 13b, and flows into the heat source side heat exchanger 12 that functions as an evaporator.
  • the heat-source-side refrigerant that has flowed into the heat-source-side heat exchanger 12 absorbs heat from the air in the outdoor space 6 (hereinafter referred to as “outside air”) by the heat-source-side heat exchanger 12, and becomes a low-temperature / low-pressure gas refrigerant.
  • the low-temperature and low-pressure gas refrigerant flowing out from the heat source side heat exchanger 12 is again sucked into the compressor 10 via the first refrigerant flow switching device 11 and the accumulator 19.
  • the expansion device 26 has a value obtained by converting the pressure of the heat-source-side refrigerant flowing between the heat exchanger related to heat medium 25 and the expansion device 26 into a saturation temperature, and the temperature on the outlet side of the heat exchanger related to heat medium 25.
  • the degree of opening is controlled so that the subcool (degree of supercooling) obtained as a difference from the above becomes constant.
  • the heat of the heat source side refrigerant is transmitted to the heat medium in both the heat exchanger related to heat medium 25a and the heat exchanger related to heat medium 25b, and the heated heat medium is piped 5 by the pump 31a and the pump 31b.
  • the inside will be allowed to flow.
  • the heat medium pressurized and discharged by the pump 31a and the pump 31b passes through the second heat medium flow switching device 33a to the second heat medium flow switching device 33d, and the use side heat exchanger 35a to the use side heat exchange.
  • the indoor space 7 is heated by the heat medium radiating heat to the indoor air by the use side heat exchanger 35a to the use side heat exchanger 35d.
  • the heat medium flows out from the use side heat exchanger 35a to the use side heat exchanger 35d and flows into the heat medium flow control device 34a to the heat medium flow control device 34d.
  • the heat medium flow control device 34a to the heat medium flow control device 34d control the flow rate of the heat medium to a flow rate necessary to cover the air conditioning load required indoors, so that the use-side heat exchanger 35a. It flows into the use side heat exchanger 35d.
  • the heat medium flowing out from the heat medium flow control device 34a to the heat medium flow control device 34d passes through the first heat medium flow switching device 32a to the first heat medium flow switching device 32d, and then the heat exchanger related to heat medium 25a.
  • the heat quantity flowing into the heat exchanger related to heat medium 25b and supplied to the indoor space 7 through the indoor unit 3 is received from the refrigerant side and sucked into the pump 31a and the pump 31b again.
  • the heat medium is directed from the second heat medium flow switching device 33 to the first heat medium flow switching device 32 via the heat medium flow control device 34.
  • the air conditioning load required in the indoor space 7 is the temperature detected by the temperature sensor 40 or the temperature detected by the temperature sensor 40 and the temperature of the heat medium flowing out from the use side heat exchanger 35. This can be covered by controlling the difference to keep it at the target value.
  • the outlet temperature of the heat exchanger related to heat medium 25 either the temperature sensor 40a or the temperature sensor 40b may be used, or an average temperature of these may be used.
  • the first heat medium flow switching device 32 and the second heat medium flow switching device 33 seem to secure a flow path that flows to both the heat medium heat exchanger 25a and the heat medium heat exchanger 25b.
  • the opening degree is controlled to an intermediate opening degree or an opening degree corresponding to the heat medium temperature at the outlet of the heat exchanger related to heat medium 25a and the heat exchanger related to heat medium 25b.
  • the usage-side heat exchanger 35 should be controlled by the temperature difference between the inlet and the outlet, but the temperature of the heat medium on the inlet side of the usage-side heat exchanger 35 is the temperature detected by the temperature sensor 40. The number of temperature sensors can be reduced by using the temperature sensor 40, and the system can be configured at low cost.
  • the heating only operation mode When the heating only operation mode is executed, it is not necessary to flow the heat medium to the use side heat exchanger 35 (including the thermo-off) without the heat load, so the flow path is closed by the heat medium flow control device 34 and the use side The heat medium is prevented from flowing to the heat exchanger 35.
  • the heat medium flows because all of the use side heat exchangers 35a to 35d have a heat load.
  • the corresponding heat medium flow control device 34 is used. Should be fully closed. Then, when a heat load is generated again, the corresponding heat medium flow control device 34 is opened, and the heat medium is circulated. The same applies to other operation modes described below.
  • FIG. 4 is a refrigerant circuit diagram illustrating a refrigerant flow when the air-conditioning apparatus 100 is in the cooling only operation mode.
  • the cooling only operation mode will be described by taking as an example a case where a cooling load is generated in all of the use side heat exchangers 35a to 35d.
  • the piping represented by the thick line has shown the piping through which the heat source side refrigerant
  • the flow direction of the heat source side refrigerant is indicated by solid line arrows, and the flow direction of the heat medium is indicated by broken line arrows.
  • the first refrigerant flow switching device 11 is switched so that the heat source side refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12.
  • the pump 31a and the pump 31b are driven, the heat medium flow control devices 34a to 34d are opened, and the heat medium heat exchanger 25a and the heat medium heat exchanger 25b are used respectively.
  • the heat medium circulates between the side heat exchanger 35a and the use side heat exchanger 35d.
  • the second refrigerant flow switching device 28a and the second refrigerant flow switching device 28b are switched to the cooling side, the opening / closing device 27 is open, and the opening / closing device 29 is closed.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the heat source side heat exchanger 12 via the first refrigerant flow switching device 11 and performs heat exchange with the outside air, and the high-temperature and high-pressure liquid or two
  • the refrigerant connection pipe 4 a is conducted and flows out of the outdoor unit 1.
  • the high-temperature and high-pressure liquid or two-phase refrigerant that has flowed out of the outdoor unit 1 flows into the relay unit 2 through the refrigerant pipe 4.
  • the high-temperature / high-pressure liquid or two-phase refrigerant that has flowed into the relay unit 2 passes through the opening / closing device 27, and is branched and expanded by the expansion device 26a and the expansion device 26b to become a low-temperature / low-pressure two-phase refrigerant. .
  • These two-phase refrigerants evaporate while absorbing heat from the heat medium circulating in the heat medium circuit B, and become low-temperature gas refrigerants.
  • the pipe 4 is conducted, passes through the check valve 13 c, and is sucked again into the compressor 10 through the first refrigerant flow switching device 11 and the accumulator 19.
  • the expansion device 26 calculates a value obtained by converting the pressure of the heat-source-side refrigerant flowing between the heat exchanger 25 between the heat medium 25 and the expansion device 26 into a saturation temperature and the temperature on the outlet side of the heat exchanger 25 between the heat media.
  • the opening degree is controlled so that the superheat (superheat degree) obtained as the difference becomes constant.
  • the saturation temperature obtained by converting the temperature at the intermediate position may be used instead. In this case, it is not necessary to install a pressure sensor, and the system can be configured at low cost.
  • the cold heat of the heat source side refrigerant is transmitted to the heat medium in both the heat exchangers 25a and 25b, and the cooled heat medium is pressurized by the pump 31a and the pump 31b. It flows out and flows into the use side heat exchanger 35a to the use side heat exchanger 35d via the second heat medium flow switching device 33a to the second heat medium flow switching device 33d.
  • the heat medium absorbs heat from the indoor air in the use side heat exchanger 35a to the use side heat exchanger 35d, thereby cooling the indoor space 7.
  • the heat medium flows out from the use side heat exchanger 35a to the use side heat exchanger 35d and flows into the heat medium flow control device 34a to the heat medium flow control device 34d.
  • the use side heat exchanger 35a is controlled by the operation of the heat medium flow control device 34a to the heat medium flow control device 34d so that the flow rate of the heat medium is controlled to a flow rate necessary to cover the air conditioning load required in the other room. It flows into the use side heat exchanger 35d.
  • the heat medium flowing out from the heat medium flow control device 34a to the heat medium flow control device 34d passes through the first heat medium flow switching device 32a to the first heat medium flow switching device 32d, and then the heat exchanger related to heat medium 25a.
  • the heat medium is directed from the second heat medium flow switching device 33 to the first heat medium flow switching device 32 via the heat medium flow control device 34.
  • the air conditioning load required in the indoor space 7 is the temperature detected by the temperature sensor 40 or the temperature detected by the temperature sensor 40 and the temperature of the heat medium flowing out from the use side heat exchanger 35. This can be covered by controlling the difference to keep it at the target value.
  • the outlet temperature of the heat exchanger related to heat medium 25 either the temperature sensor 40a or the temperature sensor 40b may be used, or an average temperature of these may be used.
  • the first heat medium flow switching device 32 and the second heat medium flow switching device 33 seem to secure a flow path that flows to both the heat medium heat exchanger 25a and the heat medium heat exchanger 25b.
  • the opening degree is controlled to an intermediate opening degree or an opening degree corresponding to the heat medium temperature at the outlet of the heat exchanger related to heat medium 25a and the heat exchanger related to heat medium 25b.
  • the usage-side heat exchanger 35 should be controlled by the temperature difference between the inlet and the outlet, but the temperature of the heat medium on the inlet side of the usage-side heat exchanger 35 is the temperature detected by the temperature sensor 40. The number of temperature sensors can be reduced by using the temperature sensor 40, and the system can be configured at low cost.
  • FIG. 5 is a refrigerant circuit diagram illustrating a refrigerant flow when the air-conditioning apparatus 100 is in the cooling / heating mixed operation mode.
  • FIG. 5 among the cooling and heating mixed operation in which the thermal load is generated in any one of the use side heat exchangers 35 and the cooling load is generated in the rest of the use side heat exchangers 35.
  • the heating main operation mode will be described.
  • tube represented by the thick line has shown the piping through which the heat source side refrigerant
  • the flow direction of the heat source side refrigerant is indicated by solid line arrows, and the flow direction of the heat medium is indicated by broken line arrows.
  • the first refrigerant flow switching device 11 is connected to the relay unit without passing the heat source side refrigerant discharged from the compressor 10 through the heat source side heat exchanger 12.
  • Switch to 2 In the relay unit 2, the pump 31a and the pump 31b are driven to open the heat medium flow rate adjusting device 34a to the heat medium flow rate adjusting device 34d, and the heat exchange between the heat medium heat exchanger 25a and the use side heat exchange in which the heat load is generated.
  • the heat medium circulates between the heat exchanger 35 and the heat exchanger 35b between the heat medium and the use side heat exchanger 35 where the heat load is generated.
  • the second refrigerant flow switching device 28a is switched to the cooling side, the second refrigerant flow switching device 28b is switched to the heating side, the expansion device 26a is fully opened, the opening / closing device 27 is closed, and the opening / closing device 29 is closed. ing.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the first refrigerant flow switching device 11, conducts through the refrigerant connection pipe 4 a, passes through the check valve 13 d, and flows out of the outdoor unit 1.
  • the high-temperature and high-pressure gas refrigerant that has flowed out of the outdoor unit 1 flows into the relay unit 2 through the refrigerant pipe 4.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the relay unit 2 flows through the second refrigerant flow switching device 28b into the heat exchanger related to heat medium 25b that acts as a condenser.
  • the gas refrigerant flowing into the heat exchanger related to heat medium 25b is condensed and liquefied while dissipating heat to the heat medium circulating in the heat medium circuit B, and becomes liquid refrigerant.
  • the liquid refrigerant flowing out of the heat exchanger related to heat medium 25b is expanded by the expansion device 26b and becomes a low-pressure two-phase refrigerant.
  • This low-pressure two-phase refrigerant flows into the heat exchanger related to heat medium 25a acting as an evaporator via the expansion device 26a.
  • the low-pressure two-phase refrigerant that has flowed into the heat exchanger related to heat medium 25a evaporates by absorbing heat from the heat medium circulating in the heat medium circuit B, thereby cooling the heat medium.
  • the low-pressure two-phase refrigerant flows out of the heat exchanger related to heat medium 25a, flows out of the relay unit 2 through the second refrigerant flow switching device 28a, and flows into the outdoor unit 1 again through the refrigerant
  • the low-temperature and low-pressure two-phase refrigerant that has flowed into the outdoor unit 1 flows into the heat source side heat exchanger 12 that acts as an evaporator through the check valve 13b.
  • coolant which flowed into the heat source side heat exchanger 12 absorbs heat from external air in the heat source side heat exchanger 12, and turns into a low temperature and low pressure gas refrigerant.
  • the low-temperature and low-pressure gas refrigerant flowing out from the heat source side heat exchanger 12 is again sucked into the compressor 10 via the first refrigerant flow switching device 11 and the accumulator 19.
  • the opening degree of the expansion device 26b is controlled so that the subcooling (supercooling degree) of the outlet refrigerant of the heat exchanger related to heat medium 25b becomes a target value. Note that the expansion device 26b may be fully opened, and the subcool may be controlled by the expansion device 26a.
  • the heat of the heat source side refrigerant is transmitted to the heat medium in the heat exchanger related to heat medium 25b, and the heated heat medium is caused to flow in the pipe 5 by the pump 31b.
  • the cold heat of the heat source side refrigerant is transmitted to the heat medium by the heat exchanger related to heat medium 25a, and the cooled heat medium is caused to flow in the pipe 5 by the pump 31a.
  • the cooled heat medium that has been pressurized and flowed out by the pump 31a flows into the use-side heat exchanger 35 where the cold load is generated via the second heat medium flow switching device 33, and is pressurized by the pump 31b.
  • the heat medium that has flowed out then flows through the second heat medium flow switching device 33 into the use side heat exchanger 35 where the heat load is generated.
  • the second heat medium flow switching device 33 is switched to the direction in which the heat exchanger related to heat medium 25b and the pump 31b are connected.
  • the indoor unit 3 is switched to the direction in which the heat exchanger related to heat medium 25a and the pump 31a are connected. That is, the second heat medium flow switching device 33 can switch the heat medium supplied to the indoor unit 3 between heating and cooling.
  • the cooling operation of the indoor space 7 by the heat medium absorbing heat from the room air or the heating operation of the indoor space 7 by the heat medium radiating heat to the room air is performed.
  • the flow rate of the heat medium is controlled to a flow rate necessary to cover the air conditioning load required indoors by the action of the heat medium flow control device 34 and flows into the use side heat exchanger 35. Yes.
  • the heat medium that has been used for cooling operation and that has passed through the use-side heat exchanger 35 and has slightly increased in temperature passes through the heat medium flow control device 34 and the first heat medium flow switching device 32, and then the heat exchanger between heat media. It flows into 25a and is sucked into the pump 31a again.
  • the heat medium that has been used for heating operation and has passed through the use-side heat exchanger 35 and has slightly decreased in temperature passes through the heat medium flow control device 34 and the first heat medium flow switching device 32, and then the heat exchanger between heat media. It flows into 25b and is sucked into the pump 31a again.
  • the first heat medium flow switching device 32 is switched to the direction in which the heat exchanger related to heat medium 25b and the pump 31b are connected when the connected indoor unit 3 is in the heating operation mode,
  • the indoor unit 3 is switched to the direction in which the heat exchanger related to heat medium 25a and the pump 31a are connected.
  • the warm heat medium and the cold heat medium are not mixed by the action of the first heat medium flow switching device 32 and the second heat medium flow switching device 33, and the use side has a heat load and a heat load, respectively. It is introduced into the heat exchanger 35.
  • the heat medium used in the heating operation mode receives heat from the refrigerant as a heating application
  • the heat medium used in the cooling operation mode receives heat from the heat medium heat exchanger 25b.
  • the heat exchangers 25a, 25a, 25a, 25a, 25c, 25c, 25c, 25c, and 25b are exchanged with the refrigerant, and then are transferred to the pump 31a and the pump 31b.
  • the first heat medium flow switching device 32 via the heat medium flow control device 34 from the second heat medium flow switching device 33 on both the heating side and the cooling side.
  • the heat medium is flowing in the direction to
  • the air conditioning load required in the indoor space 7 is the difference between the temperature detected by the temperature sensor 40b on the heating side and the temperature of the heat medium flowing out from the use side heat exchanger 35 on the cooling side. This can be covered by controlling the difference between the temperature of the heat medium flowing out from the use side heat exchanger 35 and the temperature detected by the temperature sensor 40a as a target value.
  • a cooling load is generated in one of the use side heat exchangers 35, and the remaining heat of the use side heat exchanger 35 is a heating load.
  • the flow of the heat source side refrigerant in the refrigerant circuit A and the flow of the heat medium in the heat medium circuit B are the same as in the heating main operation mode.
  • FIG. 6 is a refrigerant circuit diagram illustrating the refrigerant flow and the heat medium flow when the pump 31a does not operate in the cooling only operation mode of the air-conditioning apparatus 100.
  • the single pump operation control 1 in the cooling only operation mode will be described.
  • the piping represented by the thick line has shown the piping through which the heat source side refrigerant
  • the flow direction of the heat source side cooling is indicated by solid line arrows
  • the flow direction of the heat medium is indicated by broken line arrows.
  • the first refrigerant flow switching device 11 is switched so that the heat source side refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12. . That is, in the air conditioner 100, even when the pump 31a does not operate, the operation of the outdoor unit 1 performs the same operation as the cooling only operation mode operation in the normal operation mode described above.
  • a pump 31b other than the pump 31a that does not operate is driven to open the heat medium flow rate adjusting device 34a to the heat medium flow rate adjusting device 34d, and the heat medium exchanger 25b and the use side heat exchanger 35a to A heat medium circulates between the use side heat exchanger 35d.
  • the pump 31a since the pump 31a does not operate in the heat exchanger related to heat medium 25a, the heat medium cannot circulate between the use side heat exchanger 35a and the use side heat exchanger 35d. Therefore, in the heat exchanger related to heat medium 25a, it is not necessary to exchange heat between the refrigerant and the heat medium, and the second refrigerant flow switching device 28a is switched to the cooling side.
  • the second refrigerant flow switching device 28b is switched to the cooling side.
  • the opening / closing device 27 is open and the opening / closing device 29 is closed.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the first refrigerant flow switching device 11, passes through the heat source side heat exchanger 12, performs heat exchange with the outside air, and performs high-temperature and high-pressure liquid or It becomes a phase refrigerant and flows out of the outdoor unit 1 after passing through the check valve 13a.
  • the high-temperature and high-pressure liquid or two-phase refrigerant that has flowed out of the outdoor unit 1 flows into the relay unit 2 through the refrigerant pipe 4.
  • the high-temperature / high-pressure liquid or two-phase refrigerant that has flowed into the relay unit 2 passes through the opening / closing device 27 and is then expanded by the expansion device 26b to become a low-temperature / low-pressure two-phase refrigerant.
  • the expansion device 26a is closed and the refrigerant does not pass through.
  • This two-phase refrigerant evaporates while absorbing heat from the heat medium circulating in the heat medium circuit B, and becomes a low-temperature gas refrigerant.
  • the gas refrigerant flowing out of the heat exchanger related to heat medium 25b flows out of the relay unit 2 through the second refrigerant flow switching device 28b, passes through the check valve 13c, and the first refrigerant flow switching device 11 and the accumulator. The air is again sucked into the compressor 10 through the radiator 19.
  • the expansion device 26b has a value obtained by converting the pressure of the heat source side refrigerant flowing between the heat exchanger related to heat medium 25b and the expansion device 26b into a saturation temperature and the temperature on the outlet side of the heat exchanger related to heat medium 25b.
  • the opening degree is controlled so that the superheat (superheat degree) obtained as the difference becomes constant.
  • a saturation temperature obtained by converting the temperature at the intermediate position may be used instead. In this case, it is not necessary to install a pressure sensor, and the system can be configured at low cost.
  • the heat of the heat medium is transmitted to the heat source side refrigerant only by the heat exchanger between heat mediums 25b, and the cooled heat medium is pressurized and flows out by the pump 31b. It flows into the use side heat exchanger 35a to the use side heat exchanger 35d via the second heat medium flow switching device 33a to the second heat medium flow switching device 33d.
  • the heat medium absorbs heat from the indoor air in the use side heat exchanger 35a to the use side heat exchanger 35d, thereby cooling the indoor space 7.
  • the heat medium flows out from the use side heat exchanger 35a to the use side heat exchanger 35d and flows into the heat medium flow control device 34a to the heat medium flow control device 34d.
  • the use side heat exchanger 35a is controlled by the operation of the heat medium flow control device 34a to the heat medium flow control device 34d so that the flow rate of the heat medium is controlled to a flow rate necessary to cover the air conditioning load required in the other room. It flows into the use side heat exchanger 35d.
  • the heat medium flowing out from the heat medium flow control device 34a to the heat medium flow control device 34d passes through the first heat medium flow switching device 32a to the first heat medium flow switching device 32d to the heat exchanger related to heat medium 25b.
  • the amount of heat that flows in and is absorbed from the indoor space 7 through the indoor unit 3 is transferred to the refrigerant side, and is sucked into the pump 31b again.
  • the heat medium flows in the direction from the second heat medium flow switching device 33 to the first heat medium flow switching device 32 via the heat medium flow control device 34.
  • the air conditioning load required in the indoor space 7 is the temperature detected by the temperature sensor 40b, or the temperature detected by the temperature sensor 40b and the temperature of the heat medium flowing out from the use side heat exchanger 35. This can be covered by controlling the difference to keep it at the target value.
  • the temperature sensor 40b is used as the outlet temperature of the heat exchanger related to heat medium 25b.
  • the first heat medium flow switching device 32 and the second heat medium flow switching device 33 do not flow into the heat exchanger related to heat medium 25a because the pump 31a is not operating, so that the heat medium
  • the opening degree is adjusted toward the heat exchanger related to heat medium 25a so that a flow path flowing to the heat exchanger 25b is secured, or an opening corresponding to the heat medium temperature at the outlet of the heat exchanger 25b is used. Is controlled at a time.
  • the usage-side heat exchanger 35 should be controlled by the temperature difference between the inlet and the outlet, but the temperature of the heat medium on the inlet side of the usage-side heat exchanger 35 is the temperature detected by the temperature sensor 40b. The number of temperature sensors can be reduced by using the temperature sensor 40b, and the system can be configured at low cost.
  • FIG. 7 is a refrigerant circuit diagram illustrating the refrigerant flow and the heat medium flow when the pump 31a does not operate in the heating only operation mode of the air-conditioning apparatus 100.
  • the single pump operation control 2 in the heating only operation mode will be described.
  • the piping represented by the thick line has shown the piping through which the heat source side refrigerant
  • the flow direction of the heat source side cooling is indicated by solid line arrows
  • the flow direction of the heat medium is indicated by broken line arrows.
  • the first refrigerant flow switching device 11 relays the heat source side refrigerant discharged from the compressor 10 without passing through the heat source side heat exchanger 12. Switch to flow into unit 2. That is, even when the pump 31a does not operate, the operation of the outdoor unit 1 performs the same operation as the normal heating operation mode operation described above.
  • the pump 31b different from the pump 31a that does not operate is driven to open the heat medium flow control devices 34a to 34d, and the heat exchanger related to heat medium 25b and the use side heat exchanger 35a are opened.
  • the heat medium is circulated between the use side heat exchanger 35d.
  • the pump 31a since the pump 31a does not operate in the heat exchanger related to heat medium 25a, the heat medium cannot circulate between the use side heat exchanger 35a and the use side heat exchanger 35d. Therefore, it is not necessary to perform heat exchange between the refrigerant and the heat medium in the heat exchanger related to heat medium 25a, and the second refrigerant flow switching device 28a is switched to the heating side.
  • the second refrigerant flow switching device 28b is switched to the heating side.
  • the opening / closing device 27 is closed and the opening / closing device 29 is open.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the first refrigerant flow switching device 11, conducts through the refrigerant connection pipe 4 a, passes through the check valve 13 d, and flows out of the outdoor unit 1.
  • the high-temperature and high-pressure gas refrigerant that has flowed out of the outdoor unit 1 flows into the relay unit 2 through the refrigerant pipe 4.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the relay unit 2 flows into the heat exchanger related to heat medium 25b through the second refrigerant flow switching device 28b.
  • the pump 31a since the pump 31a is not operating, there is no heat medium flowing into and circulating through the heat exchanger related to heat medium 25a, so that the gas refrigerant flowing into the relay unit 2 flows into the heat exchanger related to heat medium 25a. It flows in and does not exchange heat.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the heat exchanger related to heat medium 25b condenses and liquefies while dissipating heat to the heat medium circulating in the heat medium circuit B, and becomes a high-pressure liquid refrigerant.
  • the liquid refrigerant flowing out of the heat exchanger related to heat medium 25b is expanded by the expansion device 26b and becomes a low-temperature, low-pressure two-phase refrigerant.
  • the two-phase refrigerant flows out of the relay unit 2 through the opening / closing device 29 and flows into the outdoor unit 1 again through the refrigerant pipe 4.
  • the refrigerant that has flowed into the outdoor unit 1 is conducted through the refrigerant connection pipe 4b, passes through the check valve 13b, and flows into the heat source side heat exchanger 12 that functions as an evaporator. At this time, the expansion device 26a is closed so that the refrigerant does not flow into the heat exchanger related to heat medium 25a.
  • the heat source side refrigerant flowing into the heat source side heat exchanger 12 absorbs heat from the outside air in the heat source side heat exchanger 12 and becomes a low-temperature / low-pressure gas refrigerant.
  • the low-temperature and low-pressure gas refrigerant flowing out from the heat source side heat exchanger 12 is again sucked into the compressor 10 via the first refrigerant flow switching device 11 and the accumulator 19.
  • the expansion device 26b includes a value obtained by converting the pressure of the heat source side refrigerant flowing between the heat exchanger related to heat medium 25b and the expansion device 26b into a saturation temperature, and a temperature on the outlet side of the heat exchanger related to heat medium 25b.
  • the degree of opening is controlled so that the subcool (degree of supercooling) obtained as a difference from the above becomes constant.
  • the temperature of the intermediate position of the intermediate heat exchanger 25b it may be used instead of the saturation temperature obtained by converting the temperature at the intermediate position. In this case, it is not necessary to install a pressure sensor, and the system can be configured at low cost.
  • the heat of the heat source side refrigerant is transmitted to the heat medium by the heat exchanger related to heat medium 25b, and the heated heat medium is caused to flow in the pipe 5 by the pump 31b. It will be.
  • the heat medium pressurized and discharged by the pump 31b is transferred to the use side heat exchanger 35a to the use side heat exchanger 35d via the second heat medium flow switching device 33a to the second heat medium flow switching device 33d.
  • the indoor space 7 is heated by the heat medium radiating heat to the indoor air by the use side heat exchanger 35a to the use side heat exchanger 35d.
  • the heat medium flows out from the use side heat exchanger 35a to the use side heat exchanger 35d and flows into the heat medium flow control device 34a to the heat medium flow control device 34d.
  • the heat medium flow control device 34a to the heat medium flow control device 34d control the flow rate of the heat medium to a flow rate necessary to cover the air conditioning load required indoors, so that the use-side heat exchanger 35a. It flows into the use side heat exchanger 35d.
  • the heat medium flowing out of the heat medium flow control device 34a to the heat medium flow control device 34d passes through the first heat medium flow switching device 32a to the first heat medium flow switching device 32d, and then the heat exchanger related to heat medium 25b.
  • the amount of heat supplied to the indoor space 7 through the indoor unit 3 is received from the refrigerant side and sucked into the pump 31b again.
  • the heat medium is directed from the second heat medium flow switching device 33 to the first heat medium flow switching device 32 via the heat medium flow control device 34.
  • the air conditioning load required in the indoor space 7 is the temperature detected by the temperature sensor 40b, or the temperature detected by the temperature sensor 40b and the temperature of the heat medium flowing out from the use side heat exchanger 35. This can be covered by controlling the difference to keep it at the target value.
  • the temperature sensor 40b is used as the outlet temperature of the heat exchanger related to heat medium 25b.
  • the first heat medium flow switching device 32 and the second heat medium flow switching device 33 do not flow into the heat exchanger related to heat medium 25a because the pump 31a is not operating, so that the heat medium
  • the opening degree is adjusted to the heat exchanger related to heat exchanger 25b so that the flow path to the heat exchanger 25b is secured, or alternatively, depending on the heat medium temperature at the outlet of the heat exchanger 25b.
  • the opening is controlled.
  • the usage-side heat exchanger 35 should be controlled by the temperature difference between the inlet and the outlet, but the temperature of the heat medium on the inlet side of the usage-side heat exchanger 35 is the temperature detected by the temperature sensor 40b.
  • the number of temperature sensors can be reduced by using the temperature sensor 40b, and the system can be configured at low cost.
  • FIG. 8 is a refrigerant circuit diagram illustrating a refrigerant flow and a heat medium flow when the pump 31a does not operate in the heating / cooling mixed operation mode of the air-conditioning apparatus 100.
  • the single pump operation control 3 in the heating / cooling mixed operation mode will be described.
  • tube represented by the thick line has shown the piping through which the heat source side refrigerant
  • the flow direction of the heat source side cooling is indicated by a solid line arrow, and the flow direction of the heat medium is indicated by a broken line arrow.
  • the first refrigerant flow switching device 11 allows the heat source side refrigerant discharged from the compressor 10 not to pass through the heat source side heat exchanger 12. It switches so that it may flow into the relay unit 2. That is, even when the pump 31a does not operate, the operation of the outdoor unit 1 performs the same operation as the normal heating / cooling mixed operation mode operation described above.
  • the pump 31b which is different from the pump 31a that does not operate, is driven to open the heat medium flow control device 34a to the heat medium flow control device 34d, and a heat load is generated between the heat exchangers 25b and the heat exchanger 25b.
  • the heat medium circulates between the use side heat exchanger 35 and the existing heat exchanger 35.
  • the pump 31a since the pump 31a does not operate in the heat exchanger related to heat medium 25a, the heat medium cannot circulate between the use side heat exchanger 35a and the use side heat exchanger 35d. Therefore, in the heat exchanger related to heat medium 25a, it is not necessary to exchange heat between the refrigerant and the heat medium, and the second refrigerant flow switching device 28a is switched to the cooling side.
  • the second refrigerant flow switching device 28b is switched to the heating side in order to create a heating medium by heat exchange.
  • the expansion device 26a is fully closed, the opening / closing device 27 is closed, and the opening / closing device 29 is open.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the first refrigerant flow switching device 11, conducts through the refrigerant connection pipe 4 a, passes through the check valve 13 d, and flows out of the outdoor unit 1.
  • the high-temperature and high-pressure gas refrigerant that has flowed out of the outdoor unit 1 flows into the relay unit 2 through the refrigerant pipe 4.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the relay unit 2 flows through the second refrigerant flow switching device 28b into the heat exchanger related to heat medium 25b that acts as a condenser.
  • the gas refrigerant flowing into the heat exchanger related to heat medium 25b is condensed and liquefied while dissipating heat to the heat medium circulating in the heat medium circuit B, and becomes liquid refrigerant.
  • the liquid refrigerant flowing out of the heat exchanger related to heat medium 25b is expanded by the expansion device 26b and becomes a low-pressure two-phase refrigerant.
  • the low-pressure two-phase refrigerant passes through the opening / closing device 29 and flows out of the relay unit 2, and then flows into the outdoor unit 1 again through the refrigerant pipe 4.
  • the expansion device 26a is fully closed, there is no refrigerant flowing into the heat exchanger related to heat medium 25a, so there is no heat exchange with the heat medium in the heat exchanger related to heat medium 25a.
  • the flow of the heat medium in the heat medium circuit B will be described.
  • the heat of the heat source side refrigerant is transmitted to the heat medium by the heat exchanger 25b between the heat medium, and the heated heat medium is caused to flow in the pipe 5 by the pump 31b. become.
  • the heat medium pressurized and discharged by the pump 31b is transferred to the use side heat exchanger 35 where the heat load is generated in the second heat medium flow switching device. Flows in through 33.
  • the second heat medium flow switching device 33 is switched to the direction in which the heat exchanger related to heat medium 25b and the pump 31b are connected,
  • the indoor units 3 connected by the heated heat medium can continue the heating operation.
  • the connected indoor unit 3 is in the cooling operation mode, since the pump 31a does not operate, the heat medium cooled by heat exchange between the refrigerant and the heat medium cannot be conveyed. Therefore, the cooling operation cannot be continued, and the second heat medium flow switching device 33 is switched in the direction in which the heat exchanger related to heat medium 25a and the pump 31a are connected.
  • the heating operation of the indoor space 7 can be continuously performed by the heat medium radiating heat to the indoor air.
  • the flow rate of the heat medium is controlled to a flow rate necessary to cover the air conditioning load required indoors by the action of the heat medium flow control device 34 and flows into the use side heat exchanger 35. Yes.
  • the heat medium flow control device 34 is closed, The inflow to the use side heat exchanger 35 can be stopped.
  • the heat medium that has been used for heating operation and has passed through the use-side heat exchanger 35 and has slightly decreased in temperature passes through the heat medium flow control device 34 and the first heat medium flow switching device 32, and then the heat exchanger between heat media. It flows into 25b and is sucked into the pump 31b again.
  • the first heat medium flow switching device 32 is connected, and the operating indoor unit 3 is in the heating operation mode, so the heat exchanger related to heat medium 25b and the pump 31b are connected. It has been switched to.
  • the connected indoor unit 3 is in the cooling operation mode, since the pump 31a is not operating, the cooling operation cannot be continued, and the first heat medium flow switching device 32 is not connected to the heat medium.
  • the direction is switched to the direction in which the heat exchanger 25a and the pump 31a are connected.
  • FIG. 9 is a refrigerant circuit diagram illustrating the refrigerant flow and the heat medium flow when the pump 31b does not operate in the cooling only operation mode of the air-conditioning apparatus 100.
  • the single pump operation control 4 in the cooling only operation mode will be described.
  • tube represented by the thick line has shown the piping through which the heat source side refrigerant
  • the flow direction of the heat source side cooling is indicated by solid line arrows
  • the flow direction of the heat medium is indicated by broken line arrows.
  • the first refrigerant flow switching device 11 is switched so that the heat source side refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12. . That is, in the air conditioner 100, even when the pump 31b does not operate, the operation of the outdoor unit 1 performs the same operation as the cooling only operation mode operation in the normal operation mode described above.
  • a pump 31a different from the pump 31b that does not operate is driven to open the heat medium flow control devices 34a to 34d, and the heat exchanger related to heat medium 25a and the use side heat exchanger 35a are opened.
  • the heat medium is circulated between the use side heat exchanger 35d.
  • the pump 31b since the pump 31b does not operate in the heat exchanger related to heat medium 25b, the heat medium cannot circulate between the use side heat exchanger 35a and the use side heat exchanger 35d. Therefore, it is not necessary to exchange heat between the refrigerant and the heat medium in the heat exchanger related to heat medium 25b, and the second refrigerant flow switching device 28b is switched to the cooling side.
  • the second refrigerant flow switching device 28a is switched to the cooling side.
  • the opening / closing device 27 is open and the opening / closing device 29 is closed.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the first refrigerant flow switching device 11, passes through the heat source side heat exchanger 12, performs heat exchange with the outside air, and performs high-temperature and high-pressure liquid or It becomes a phase refrigerant and flows out of the outdoor unit 1 after passing through the check valve 13a.
  • the high-temperature and high-pressure liquid or two-phase refrigerant that has flowed out of the outdoor unit 1 flows into the relay unit 2 through the refrigerant pipe 4.
  • the high-temperature / high-pressure liquid or two-phase refrigerant that has flowed into the relay unit 2 passes through the opening / closing device 27 and is then expanded by the expansion device 26a to become a low-temperature / low-pressure two-phase refrigerant.
  • the expansion device 26b is closed and the refrigerant does not pass through.
  • This two-phase refrigerant evaporates while absorbing heat from the heat medium circulating in the heat medium circuit B, and becomes a low-temperature gas refrigerant.
  • the gas refrigerant that has flowed out of the heat exchanger related to heat medium 25a flows out of the relay unit 2 through the second refrigerant flow switching device 28a, passes through the check valve 13c, and the first refrigerant flow switching device 11 and the accumulator. The air is again sucked into the compressor 10 through the radiator 19.
  • the expansion device 26a has a value obtained by converting the pressure of the heat source side refrigerant flowing between the heat exchanger related to heat medium 25a and the expansion device 26a into a saturation temperature and the temperature on the outlet side of the heat exchanger related to heat medium 25a.
  • the opening degree is controlled so that the superheat (superheat degree) obtained as the difference becomes constant.
  • a saturation temperature obtained by converting the temperature at the intermediate position may be used instead. In this case, it is not necessary to install a pressure sensor, and the system can be configured at low cost.
  • the heat of the heat medium is transmitted to the heat source side refrigerant only by the heat exchanger between heat mediums 25a, and the cooled heat medium is pressurized by the pump 31a and flows out. It flows into the use side heat exchanger 35a to the use side heat exchanger 35d via the second heat medium flow switching device 33a to the second heat medium flow switching device 33d.
  • the heat medium absorbs heat from the indoor air in the use side heat exchanger 35a to the use side heat exchanger 35d, thereby cooling the indoor space 7.
  • the heat medium flows out from the use side heat exchanger 35a to the use side heat exchanger 35d and flows into the heat medium flow control device 34a to the heat medium flow control device 34d.
  • the use side heat exchanger 35a is controlled by the operation of the heat medium flow control device 34a to the heat medium flow control device 34d so that the flow rate of the heat medium is controlled to a flow rate necessary to cover the air conditioning load required in the other room. It flows into the use side heat exchanger 35d.
  • the heat medium flowing out from the heat medium flow control device 34a to the heat medium flow control device 34d passes through the first heat medium flow switching device 32a to the first heat medium flow switching device 32d to the heat exchanger related to heat medium 25a.
  • the amount of heat that flows in and is absorbed from the indoor space 7 through the indoor unit 3 is passed to the refrigerant side, and is again sucked into the pump 31a.
  • the heat medium flows in the direction from the second heat medium flow switching device 33 to the first heat medium flow switching device 32 via the heat medium flow control device 34. ing.
  • the air conditioning load required in the indoor space 7 is the temperature detected by the temperature sensor 40a, or the temperature detected by the temperature sensor 40a and the temperature of the heat medium flowing out from the use side heat exchanger 35. This can be covered by controlling the difference to keep it at the target value.
  • the temperature sensor 40a is used as the outlet temperature of the heat exchanger related to heat medium 25a.
  • the first heat medium flow switching device 32 and the second heat medium flow switching device 33 do not flow into the heat exchanger related to heat medium 25b because the pump 31b is not operating, and the heat medium
  • the opening degree is adjusted to the heat exchanger related to heat exchanger 25b so that the flow path to the heat exchanger 25a is secured, or the opening according to the heat medium temperature at the outlet of the heat exchanger 25b is used. Is controlled at a time.
  • the usage-side heat exchanger 35 should be controlled by the temperature difference between the inlet and the outlet, but the temperature of the heat medium on the inlet side of the usage-side heat exchanger 35 is the temperature detected by the temperature sensor 40a. The number of temperature sensors can be reduced by using the temperature sensor 40a, and the system can be configured at low cost.
  • FIG. 10 is a refrigerant circuit diagram illustrating a refrigerant flow and a heat medium flow when the pump 31b does not operate in the heating only operation mode of the air-conditioning apparatus 100.
  • the single pump operation control 5 in the heating only operation mode will be described.
  • the piping represented by the thick line has shown the piping through which the heat source side refrigerant
  • the flow direction of the heat source side cooling is indicated by solid line arrows
  • the flow direction of the heat medium is indicated by broken line arrows.
  • the first refrigerant flow switching device 11 relays the heat source side refrigerant discharged from the compressor 10 without passing through the heat source side heat exchanger 12. Switch to flow into unit 2. That is, even when the pump 31b does not operate, the operation of the outdoor unit 1 performs the same operation as the normal heating-only operation mode operation described above.
  • a pump 31a different from the pump 31b that does not operate is driven to open the heat medium flow control devices 34a to 34d, and the heat exchanger related to heat medium 25a and the use side heat exchanger 35a are opened.
  • the heat medium is circulated between the use side heat exchanger 35d.
  • the pump 31b since the pump 31b does not operate in the heat exchanger related to heat medium 25b, the heat medium cannot circulate between the use side heat exchanger 35a and the use side heat exchanger 35d. Therefore, it is not necessary to exchange heat between the refrigerant and the heat medium in the heat exchanger related to heat medium 25b, and the second refrigerant flow switching device 28b is switched to the heating side.
  • the second refrigerant flow switching device 28a is switched to the heating side.
  • the opening / closing device 27 is closed and the opening / closing device 29 is open.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the first refrigerant flow switching device 11, conducts through the refrigerant connection pipe 4 a, passes through the check valve 13 d, and flows out of the outdoor unit 1.
  • the high-temperature and high-pressure gas refrigerant that has flowed out of the outdoor unit 1 flows into the relay unit 2 through the refrigerant pipe 4.
  • the high-temperature / high-pressure gas refrigerant that has flowed into the relay unit 2 flows into the heat exchanger related to heat medium 25a through the second refrigerant flow switching device 28a.
  • the pump 31b since the pump 31b is not operating, there is no heat medium flowing into and circulating through the heat exchanger related to heat medium 25b. Therefore, the gas refrigerant flowing into the relay unit 2 flows into the heat exchanger related to heat medium 25b. It flows in and does not exchange heat.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the heat exchanger related to heat medium 25a is condensed and liquefied while dissipating heat to the heat medium circulating in the heat medium circuit B, and becomes a high-pressure liquid refrigerant.
  • the liquid refrigerant flowing out of the heat exchanger related to heat medium 25a is expanded by the expansion device 26a to become a low-temperature / low-pressure two-phase refrigerant.
  • the two-phase refrigerant flows out of the relay unit 2 through the opening / closing device 29 and flows into the outdoor unit 1 again through the refrigerant pipe 4.
  • the refrigerant that has flowed into the outdoor unit 1 is conducted through the refrigerant connection pipe 4b, passes through the check valve 13b, and flows into the heat source side heat exchanger 12 that functions as an evaporator. At this time, the expansion device 26b is closed so that the refrigerant does not flow into the heat exchanger related to heat medium 25b.
  • the heat source side refrigerant flowing into the heat source side heat exchanger 12 absorbs heat from the outside air in the heat source side heat exchanger 12 and becomes a low-temperature / low-pressure gas refrigerant.
  • the low-temperature and low-pressure gas refrigerant flowing out from the heat source side heat exchanger 12 is again sucked into the compressor 10 via the first refrigerant flow switching device 11 and the accumulator 19.
  • the expansion device 26a includes a value obtained by converting the pressure of the heat source side refrigerant flowing between the heat exchanger related to heat medium 25a and the expansion device 26a into a saturation temperature, and the temperature on the outlet side of the heat exchanger related to heat medium 25a.
  • the degree of opening is controlled so that the subcool (degree of supercooling) obtained as a difference from the above becomes constant.
  • the temperature of the intermediate position of the intermediate heat exchanger 25a it may be used instead of the saturation temperature obtained by converting the temperature at the intermediate position. In this case, it is not necessary to install a pressure sensor, and the system can be configured at low cost.
  • the heat of the heat source side refrigerant is transmitted to the heat medium by the heat exchanger related to heat medium 25a, and the heated heat medium is caused to flow in the pipe 5 by the pump 31a. It will be.
  • the heat medium pressurized and discharged by the pump 31a is transferred to the use side heat exchanger 35a to the use side heat exchanger 35d via the second heat medium flow switching device 33a to the second heat medium flow switching device 33d.
  • the indoor space 7 is heated by the heat medium radiating heat to the indoor air by the use side heat exchanger 35a to the use side heat exchanger 35d.
  • the heat medium flows out from the use side heat exchanger 35a to the use side heat exchanger 35d and flows into the heat medium flow control device 34a to the heat medium flow control device 34d.
  • the heat medium flow control device 34a to the heat medium flow control device 34d control the flow rate of the heat medium to a flow rate necessary to cover the air conditioning load required indoors, so that the use-side heat exchanger 35a. It flows into the use side heat exchanger 35d.
  • the heat medium flowing out from the heat medium flow control device 34a to the heat medium flow control device 34d passes through the first heat medium flow switching device 32a to the first heat medium flow switching device 32d, and then the heat exchanger related to heat medium 25a.
  • the amount of heat supplied to the indoor space 7 through the indoor unit 3 is received from the refrigerant side and sucked into the pump 31b again.
  • the heat medium is directed from the second heat medium flow switching device 33 to the first heat medium flow switching device 32 via the heat medium flow control device 34.
  • the air conditioning load required in the indoor space 7 is the temperature detected by the temperature sensor 40a, or the temperature detected by the temperature sensor 40a and the temperature of the heat medium flowing out from the use side heat exchanger 35. This can be covered by controlling the difference to keep it at the target value.
  • the temperature sensor 40a is used as the outlet temperature of the heat exchanger related to heat medium 25a.
  • the first heat medium flow switching device 32 and the second heat medium flow switching device 33 do not flow into the heat exchanger related to heat medium 25b because the pump 31b is not operating, and the heat medium
  • the opening degree is adjusted to the heat exchanger related to heat exchanger 25a so that the flow path to the heat exchanger 25a is secured, or the opening corresponding to the heat medium temperature at the outlet of the heat exchanger 25a is changed. Is controlled at a time.
  • the usage-side heat exchanger 35 should be controlled by the temperature difference between the inlet and the outlet, but the temperature of the heat medium on the inlet side of the usage-side heat exchanger 35 is the temperature detected by the temperature sensor 40a. The number of temperature sensors can be reduced by using the temperature sensor 40a, and the system can be configured at low cost.
  • FIG. 11 is a refrigerant circuit diagram illustrating the refrigerant flow and the heat medium flow when the pump 31b does not operate in the heating / cooling mixed operation mode of the air-conditioning apparatus 100.
  • the single pump operation control 6 in the heating / cooling mixed operation mode will be described.
  • the piping represented by the thick line has shown the piping through which the heat source side refrigerant
  • the flow direction of the heat source side cooling is indicated by solid line arrows
  • the flow direction of the heat medium is indicated by broken line arrows.
  • the first refrigerant flow switching device 11 allows the heat source side refrigerant discharged from the compressor 10 not to pass through the heat source side heat exchanger 12. It switches so that it may flow into the relay unit 2. That is, even when the pump 31b does not operate, the operation of the outdoor unit 1 performs the same operation as the normal heating / cooling mixed operation mode operation described above.
  • a pump 31a different from the pump 31b that does not operate is driven to open the heat medium flow control devices 34a to 34d, and a heat load is generated between the heat exchangers 25a and the heat exchanger 25a.
  • the heat medium circulates between the use side heat exchanger 35 and the existing heat exchanger 35.
  • the pump 31b since the pump 31b does not operate in the heat exchanger related to heat medium 25b, the heat medium cannot circulate between the use side heat exchanger 35a and the use side heat exchanger 35d. Therefore, it is not necessary to exchange heat between the refrigerant and the heat medium in the heat exchanger related to heat medium 25b, and the second refrigerant flow switching device 28b is switched to the cooling side.
  • the second refrigerant flow switching device 28a is switched to the heating side in order to create a heating medium by heat exchange.
  • the expansion device 26b is fully closed, the opening / closing device 27 is closed, and the opening / closing device 29 is open.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the first refrigerant flow switching device 11, conducts through the refrigerant connection pipe 4 a, passes through the check valve 13 d, and flows out of the outdoor unit 1.
  • the high-temperature and high-pressure gas refrigerant that has flowed out of the outdoor unit 1 flows into the relay unit 2 through the refrigerant pipe 4.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the relay unit 2 flows through the second refrigerant flow switching device 28a into the heat exchanger related to heat medium 25a that acts as a condenser.
  • the gas refrigerant flowing into the heat exchanger related to heat medium 25a is condensed and liquefied while dissipating heat to the heat medium circulating in the heat medium circuit B, and becomes liquid refrigerant.
  • the liquid refrigerant flowing out of the heat exchanger related to heat medium 25a is expanded by the expansion device 26a to become a low-pressure two-phase refrigerant.
  • the low-pressure two-phase refrigerant passes through the opening / closing device 29 and flows out of the relay unit 2, and then flows into the outdoor unit 1 again through the refrigerant pipe 4.
  • the expansion device 26b is fully closed, there is no refrigerant flowing into the heat exchanger related to heat medium 25b, so there is no heat exchange with the heat medium in the heat exchanger related to heat medium 25b.
  • the flow of the heat medium in the heat medium circuit B will be described.
  • the heat of the heat source side refrigerant is transmitted to the heat medium by the heat exchanger related to heat medium 25a, and the heated heat medium is caused to flow in the pipe 5 by the pump 31a. become.
  • the heat medium pressurized and discharged by the pump 31a is transferred to the use-side heat exchanger 35 in which the heat load is generated in the second heat medium flow switching device. Flows in through 33.
  • the second heat medium flow switching device 33 is switched to the direction in which the heat exchanger related to heat medium 25a and the pump 31a are connected, The indoor units 3 connected by the heated heat medium can continue the heating operation.
  • the connected indoor unit 3 is in the cooling operation mode, since the pump 31b does not operate, the heat medium cooled by heat exchange between the refrigerant and the heat medium cannot be conveyed. Therefore, the cooling operation cannot be continued, and the second heat medium flow switching device 33 is switched to the direction in which the heat exchanger related to heat medium 25b and the pump 31b are connected.
  • the heating operation of the indoor space 7 can be continuously performed by the heat medium radiating heat to the indoor air.
  • the flow rate of the heat medium is controlled to a flow rate necessary to cover the air conditioning load required indoors by the action of the heat medium flow control device 34 and flows into the use side heat exchanger 35.
  • the cooling operation of the indoor space 7 by the heat medium absorbing heat from the indoor unit air the cooled heat medium cannot be transported due to the non-operation of the pump 31b, so that the heat medium flow control device 34 is closed, The inflow to the use side heat exchanger 35 can be stopped.
  • the heat medium that has been used for heating operation and has passed through the use-side heat exchanger 35 and has slightly decreased in temperature passes through the heat medium flow control device 34 and the first heat medium flow switching device 32, and then the heat exchanger between heat media. It flows into 25a and is sucked into pump 31a again.
  • the first heat medium flow switching device 32 is connected, and the operating indoor unit 3 is in the heating operation mode, and therefore the direction in which the heat exchanger related to heat medium 25a and the pump 31a are connected. It has been switched to.
  • the connected indoor unit 3 is in the cooling operation mode, since the pump 31b is not operating, the cooling operation cannot be continued, and the first heat medium flow switching device 32 is not connected between the heat media.
  • the direction is switched to the direction in which the heat exchanger 25b and the pump 31b are connected.
  • FIG. 12 is a table showing the movement of each heat medium flow switching device and each heat medium flow rate adjustment device when the heat medium transport device (pump 31) does not operate in each operation mode of the air conditioner 100.
  • the opening direction of the medium flow rate adjusting device 34 is shown. Accordingly, in the air conditioner 100, the cooling operation or the heating operation is continued by switching the heat medium flow path in each operation mode and controlling the flow rate adjustment of the heat medium.
  • control device 50 can be configured to give priority to the indoor unit 3. In this way, it is possible to realize an operation that gives priority to the indoor unit 3 that always requires some load.
  • the pump 31a on the cooling main side among the mounted pumps 31 does not operate and is connected.
  • the operation mode of the relay unit 2 is changed from the mixed operation mode to [one pump operation control 4]. Is done.
  • the pump 31b on the heating main side of the mounted pumps 31 does not operate and is connected.
  • the operation mode of the indoor unit 3 to which the priority is given is the heating operation among the indoor units 3 being operated
  • the operation mode of the relay unit 2 is changed from the mixed operation mode to [one pump operation control 2]. Be changed.
  • the first heat medium flow switching device 32 and the second heat medium flow switching device 33 described in the present embodiment can switch a three-way flow such as a three-way valve, and can open and close a two-way flow such as an on-off valve. What is necessary is just to be able to switch a flow path, such as combining two things to perform.
  • the first heat medium can be obtained by combining two things such as a stepping motor drive type mixing valve that can change the flow rate of the three-way flow path and two things that can change the flow rate of the two-way flow path such as an electronic expansion valve.
  • the flow path switching device 32 and the second heat medium flow path switching device 33 may be used. In this case, it is possible to prevent water hammer due to sudden opening and closing of the flow path.
  • the heat medium flow control device 34 is a two-way valve
  • a bypass pipe that bypasses the use-side heat exchanger 35 as a control valve having a three-way flow path. You may make it install.
  • the heat medium flow control device 34 may be a stepping motor driven type that can control the flow rate flowing through the flow path, and may be a two-way valve or a one-way valve with one end closed. Further, as the heat medium flow control device 34, a device that opens and closes a two-way flow path such as an open / close valve may be used, and the average flow rate may be controlled by repeating ON / OFF.
  • the second refrigerant flow switching device 28 is shown as a four-way valve, the present invention is not limited to this, and a plurality of two-way flow switching valves and three-way flow switching valves are used in the same manner. You may comprise so that a refrigerant
  • coolant may flow.
  • the heat medium for example, brine (antifreeze), water, a mixture of brine and water, a mixture of water and an additive having a high anticorrosive effect, or the like can be used. Therefore, in the air conditioning apparatus 100, even if the heat medium leaks into the indoor space 7 through the indoor unit 3, it contributes to the improvement of safety because a highly safe heat medium is used. Become.
  • the air conditioner 100 includes the accumulator 19
  • the heat source side heat exchanger 12 and the use side heat exchanger 35 are provided with a blower, and in many cases, condensation or evaporation is promoted by blowing air, but this is not restrictive.
  • the use side heat exchanger 35 can be a panel heater using radiation
  • the heat source side heat exchanger 12 is a water-cooled type that moves heat by water or antifreeze.
  • the case where there are four usage-side heat exchangers 35 has been described as an example, but the number is not particularly limited.
  • the case where the number of heat exchangers between heat mediums 25a and the heat exchangers between heat mediums 25b is two has been described as an example, naturally the present invention is not limited to this, so that the heat medium can be cooled or / and heated. If it comprises, you may install how many.
  • the number of pumps 31a and 31b is not limited to one, and a plurality of small-capacity pumps may be connected in parallel.
  • each heat medium flow switching device and each heat medium flow rate adjustment device in the heat medium circuit B are appropriately switched based on the priority in the operation of the indoor unit 3, and cooling operation or heating is performed. A driving mode with high priority can be selected and continuously implemented, so that the user's comfort can be further maintained.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention concerne un appareil de conditionnement d'air (100) qui transporte un milieu chauffant vers des échangeurs de chaleur côté utilisation (35a à 35d) à l'aide d'une pompe (31b) lorsqu'une pompe (31b) ne fonctionne pas.
PCT/JP2013/054789 2013-02-25 2013-02-25 Appareil de conditionnement d'air WO2014128971A1 (fr)

Priority Applications (2)

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JP2015501233A JP6062030B2 (ja) 2013-02-25 2013-02-25 空気調和装置
PCT/JP2013/054789 WO2014128971A1 (fr) 2013-02-25 2013-02-25 Appareil de conditionnement d'air

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2013/054789 WO2014128971A1 (fr) 2013-02-25 2013-02-25 Appareil de conditionnement d'air

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11060779B2 (en) * 2018-02-07 2021-07-13 Mitsubishi Electric Corporation Air-conditioning system and air-conditioning control method
US11635234B2 (en) 2017-11-30 2023-04-25 Mitsubishi Electric Corporation Refrigeration cycle apparatus recovering refrigerator oil in refrigerant circuit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03117837A (ja) * 1989-09-29 1991-05-20 Hitachi Ltd 蓄熱式冷却装置
JP2004138289A (ja) * 2002-10-16 2004-05-13 Mitsubishi Electric Corp 空気調和システム
JP2008232562A (ja) * 2007-03-22 2008-10-02 Daikin Ind Ltd 空調システム
WO2010049999A1 (fr) * 2008-10-29 2010-05-06 三菱電機株式会社 Conditionneur d'air

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
JPH05280818A (ja) * 1992-04-01 1993-10-29 Matsushita Refrig Co Ltd 多室冷暖房装置
JP4123829B2 (ja) * 2002-05-28 2008-07-23 三菱電機株式会社 冷凍サイクル装置
WO2010049998A1 (fr) * 2008-10-29 2010-05-06 三菱電機株式会社 Conditionneur d'air et dispositif de relais

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03117837A (ja) * 1989-09-29 1991-05-20 Hitachi Ltd 蓄熱式冷却装置
JP2004138289A (ja) * 2002-10-16 2004-05-13 Mitsubishi Electric Corp 空気調和システム
JP2008232562A (ja) * 2007-03-22 2008-10-02 Daikin Ind Ltd 空調システム
WO2010049999A1 (fr) * 2008-10-29 2010-05-06 三菱電機株式会社 Conditionneur d'air

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11635234B2 (en) 2017-11-30 2023-04-25 Mitsubishi Electric Corporation Refrigeration cycle apparatus recovering refrigerator oil in refrigerant circuit
US11060779B2 (en) * 2018-02-07 2021-07-13 Mitsubishi Electric Corporation Air-conditioning system and air-conditioning control method

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