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WO2012160605A1 - Dispositif climatiseur - Google Patents

Dispositif climatiseur Download PDF

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Publication number
WO2012160605A1
WO2012160605A1 PCT/JP2011/002932 JP2011002932W WO2012160605A1 WO 2012160605 A1 WO2012160605 A1 WO 2012160605A1 JP 2011002932 W JP2011002932 W JP 2011002932W WO 2012160605 A1 WO2012160605 A1 WO 2012160605A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat medium
heat
refrigerant
heat exchanger
control device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2011/002932
Other languages
English (en)
Japanese (ja)
Inventor
幸志 東
祐治 本村
啓輔 ▲高▼山
森本　修
山下　浩司
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2011/002932 priority Critical patent/WO2012160605A1/fr
Priority to JP2013516078A priority patent/JP5642270B2/ja
Priority to EP11866029.9A priority patent/EP2716997B1/fr
Publication of WO2012160605A1 publication Critical patent/WO2012160605A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • 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
    • F25B2313/0272—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using bridge circuits of one-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
    • F25B2313/02732—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
    • F25B2500/00—Problems to be solved
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle

Definitions

  • the present invention relates to an air conditioner that is applied to, for example, a building multi-air conditioner, etc., and in particular, air that is capable of efficiently supplying hot or cold produced by a heat source machine or both hot and cold to a plurality of loads. It relates to a harmony device.
  • an air conditioner that performs heat exchange using a heat medium (cold liquid or hot liquid) from a heat source device (heat source equipment), a heat medium that circulates between the heat source unit and the indoor unit (air conditioner) Some perform pre-cooling and pre-heating.
  • a heat medium cold liquid or hot liquid
  • air conditioner indoor unit
  • the air conditioner that is scheduled to operate on the same day is forced to fully open the valve of the cold liquid coil or hot liquid coil, and the air conditioner is A precooling preheating control method for air conditioning equipment has been proposed in which precooling preheating up to the coil of the air conditioning equipment is performed in the shortest time to reduce power consumption and eliminate wasteful supply of heat by liquid (see, for example, Patent Document 1) ).
  • the present invention has been made to solve the above-described problems, can perform simultaneous cooling and heating operation, suppress the pressure fluctuation on the refrigerant side even when starting the indoor unit or switching the operation mode of the indoor unit, It is an object of the present invention to provide a highly reliable air conditioner that can efficiently supply hot and cold generated by a heat source machine, or both hot and cold to a plurality of loads.
  • 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 circulation paths.
  • a refrigerant circulation circuit that circulates the heat source side refrigerant by connecting with piping, a pump, a plurality of use side heat exchangers, a heat medium flow control device, and a heat medium side flow path of the heat exchanger between heat mediums with a heat medium pipe
  • a heat medium circulation circuit that connects and circulates the heat medium; and a control device that adjusts a flow rate of the heat medium by controlling an opening degree of the heat medium flow control device, and the control device includes the use side.
  • the heat medium flow control device so that a predetermined amount of heat medium flows through the use side heat exchanger before any use side heat exchanger of the heat exchanger starts operation or before the operation mode is switched. Is controlled to the first opening, so that the refrigerant pressure fluctuation on the refrigerant circuit side Running suppressing pressure fluctuation suppressing operation.
  • the air conditioner according to the present invention adjusts the flow rate of the heat medium to be circulated to the target indoor unit when the indoor unit is started or when the operation mode is switched, so that the refrigerant side can be used even in a system capable of simultaneous cooling and heating.
  • the pressure fluctuation can be suppressed and the reliability can be improved.
  • 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 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 can be installed as a separate housing from the outdoor unit 1 and the indoor unit 3 and in a position different from the outdoor space 6 and the indoor space 7 (for example, a common space in the building 9 or a space behind the ceiling).
  • the outdoor unit 1 and the indoor unit 3 are connected to each other by a refrigerant pipe 4 and a pipe 5, respectively, and 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 conveyed heat source side refrigerant exchanges heat with the heat medium in a heat exchanger between heat mediums (described later) in the relay unit 2 to heat or cool the heat medium. That is, hot water or cold water is produced by the heat exchanger between heat media.
  • Hot water or cold water produced by the relay unit 2 is conveyed to the indoor unit 3 through the pipe 5 by a heat medium conveying device (described later), and is used for heating operation or cooling operation for the indoor space 7 by the indoor unit 3.
  • Examples of the heat source side refrigerant flowing through the refrigerant pipe 4 include single refrigerants such as R-22 and R-134a, pseudo-azeotropic mixed refrigerants such as R-410A and R-404A, and non-azeotropic mixed refrigerants such as R-407C.
  • a refrigerant containing a double bond in the chemical formula, a refrigerant having a relatively low global warming potential such as CF 3 CF ⁇ CH 2 , a mixture thereof, or a natural refrigerant such as CO 2 or propane can be used. .
  • the heat medium flowing through the pipe 5 for example, water, antifreeze, a mixed solution of water and antifreeze, a mixed solution 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
  • the relay unit 2 can also be installed in a common space where there is an elevator or the like.
  • the indoor unit 3 is a ceiling cassette type
  • mold is shown as an example, it is not limited to this, It is directly or directly in the indoor space 7, such as a ceiling embedded type and a ceiling suspended type. Any type of air can be used as long as heating air or cooling air can be blown out by a duct or the like.
  • 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 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. Furthermore, 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.
  • Multiple relay units 2 may be connected to one outdoor unit.
  • the plurality of relay units 2 can be installed in a shared space such as a building or a space such as the back of the ceiling. By carrying out like this, 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. It becomes possible to make the flow of the heat source side refrigerant flowing into the unit 2 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 includes a fluid of air and a heat source side refrigerant supplied from a blower such as a fan (not shown).
  • the heat source side refrigerant is evaporated and condensed or liquefied.
  • 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 performs heat exchange between air supplied from a blower such as a fan (not shown) and a heat medium supplied from the relay unit 2, and supplies the heat to the indoor space 7. Heating air or cooling air is generated.
  • 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 has two or more heat exchangers for heat medium 25.
  • the heat exchanger 25 performs heat exchange between the heat source side refrigerant and the heat medium, and is generated in the outdoor unit 1.
  • the cool or warm heat stored in the heat source side refrigerant is transmitted to the heat medium.
  • the relay unit 2 further includes two expansion devices 26, two opening / closing devices (opening / closing device 27, opening / closing device 29), two second refrigerant flow switching devices 28, and two pumps (heat medium conveying device). ) 31, four first heat medium flow switching devices 32, four second heat medium flow switching devices 33, and four heat medium flow control devices 34 are 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 circulation circuit A, and is used for the heat medium in the cooling only operation mode and the cooling / heating mixed operation mode. It is used for cooling.
  • 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 is heated during the heating only operation mode and the cooling / heating mixed operation mode. It is used for heating the medium.
  • 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 are controlled according to the operation mode, and the flow path of the heat source side refrigerant is switched together with the second refrigerant flow switching device 28.
  • 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 state which installed the two pumps 31 in the heat-medium exit side of the heat exchanger 25 between heat media is shown in the example, you may install in the heat-medium inlet side of the heat exchanger 25 between heat media. Needless to say.
  • 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 can control the opening area (for example, the stepping motor drive type can control the flow rate flowing through the flow path. One end of a three-way valve or a three-way valve is closed), and controls the flow rate of the heat medium flowing in the pipe 5.
  • 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 pressure sensor 41 (pressure sensor 41a, pressure sensor 41b) for detecting the pressure of the heat source side refrigerant flowing through the refrigerant pipe 4. Further, the relay unit 2 is provided with a temperature sensor 37 (temperature sensor 37a to temperature sensor 37d) on the inlet side of the heat medium flow path.
  • a pressure sensor 41 pressure sensor 41a, pressure sensor 41b
  • a temperature sensor 37 temperature sensor 37a to temperature sensor 37d
  • 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), Used for control of switching of the first refrigerant flow 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. Will be.
  • the control device 50 is constituted by a microcomputer or the like, and based on detection information from various detection devices and instructions from the 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 switching device, switching of the second refrigerant flow switching device 28, switching of the first heat medium flow switching device 32, Each actuator (pump 31, first heat medium flow switching device 32, second heat medium flow switching device 33, switching of the second heat medium flow switching device 33, driving of the heat medium flow control device 34, etc.)
  • the driving devices such as the expansion device 26 and the second refrigerant flow switching device 28 are controlled, and each operation mode described later is executed. In addition, you may make it implement these controls with the control apparatus mounted in the outdoor unit 1.
  • FIG. In this case, the control device 50 may be mounted on the outdoor unit 1.
  • 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 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. By using such a configuration, 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 a 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 the 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.
  • 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 heat of the heat source side refrigerant is transmitted to the heat medium in both the heat exchangers between heat exchangers 25a and 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 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 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. Flowing.
  • 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. Can 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 heating main operation mode.
  • the heating main operation mode is exemplified by a case where a thermal load is generated in any of the use side heat exchangers 35 and a cooling load is generated in the rest of the use side heat exchangers 35.
  • the piping represented with 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 refrigerant connection pipe 4b and 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 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. 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 the cooling operation and has passed through the use-side heat exchanger 35 and has risen 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 related to heat medium 25a. And is sucked into the pump 31a again.
  • the heat medium that has been used for the heating operation and has passed through the use-side heat exchanger 35 and whose temperature has decreased passes through the heat medium flow control device 34 and the first heat medium flow switching device 32, and the heat exchanger related to heat medium 25b. And is sucked into the pump 31b 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
  • FIG. 5 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 exchanger 35a to the use side heat exchanger 35d.
  • the pipes represented by the thick lines indicate the pipes through which the heat source side refrigerant flows.
  • 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 opened, 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 flows into the heat source side heat exchanger 12 via the first refrigerant flow switching device 11. Then, the heat source side heat exchanger 12 condenses and liquefies while dissipating heat to the outside air to become a high-pressure liquid refrigerant.
  • the high-pressure liquid refrigerant flowing into the relay unit 2 is branched after passing through the opening / closing device 27 and expanded by the expansion device 26a and the expansion device 26b to become a low-temperature / low-pressure two-phase refrigerant.
  • the two-phase refrigerant flows into each of the heat exchanger related to heat medium 25a and the heat exchanger related to heat medium 25b that acts as an evaporator, and absorbs heat from the heat medium circulating in the heat medium circulation circuit B. It becomes a low-temperature, low-pressure gas refrigerant while cooling.
  • the gas refrigerant that has flowed out of the heat exchanger related to heat medium 25a and the heat exchanger related to heat medium 25b merges after passing through the second refrigerant flow switching device 28a and the second refrigerant flow switching device 28b, and is connected to the relay unit 2. And flows into the outdoor unit 1 again through the refrigerant pipe 4.
  • the refrigerant that has flowed into the outdoor unit 1 passes through the check valve 13 c and is sucked into the compressor 10 again via the first refrigerant flow switching device 11 and the accumulator 19.
  • the expansion device 26 performs superheat (superheat degree) obtained as the difference between the temperature of the heat source side refrigerant flowing into the heat exchanger related to heat medium 25 and the temperature of the heat source side refrigerant flowing out of the heat exchanger related to heat medium 25. ) Is controlled to be constant.
  • the flow of the heat medium in the heat medium circuit B will be described.
  • the cold heat of the heat source side refrigerant is transmitted to the heat medium in both the heat exchanger 25a and the heat exchanger 25b, and the cooled 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. Flow into the vessel 35d.
  • the heat medium absorbs heat from the indoor air in the use side heat exchangers 35a to 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 35b 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. And it flows into the heat exchanger 25b between heat media, gives the amount of heat received from the air of the indoor space 7 through the indoor unit 3 to the refrigerant side, and is sucked into the pump 31a and the pump 31b again.
  • 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 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. Flowing.
  • FIG. 6 is a refrigerant circuit diagram illustrating a refrigerant flow when the air-conditioning apparatus 100 is in the cooling main operation mode.
  • the first cooling main operation is performed by taking as an example a case where a cooling load is generated in any of the use side heat exchangers 35 and a heating load is generated in the remaining of the use side heat exchangers 35.
  • the 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 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 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 flows into the heat source side heat exchanger 12 via the first refrigerant flow switching device 11. Then, the heat source side heat exchanger 12 condenses while radiating heat to the outdoor air, and becomes a high-pressure two-phase refrigerant.
  • the two-phase refrigerant that has flowed out of the heat source side heat exchanger 12 flows out of the outdoor unit 1 through the check valve 13a, and flows into the relay unit 2 through the refrigerant pipe 4.
  • the two-phase 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 two-phase 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 a 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 absorbs heat from the heat medium circulating in the heat medium circuit B, and becomes a low-pressure gas refrigerant while cooling the heat medium.
  • the gas 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 pipe 4.
  • the heat-source-side refrigerant that has flowed into the outdoor unit 1 passes through the check valve 13 c and is sucked into the compressor 10 again 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 in the intermediate heat exchanger 25a, and the cooled heat medium is caused to flow in the pipe 5 by the pump 31a.
  • the heat medium pressurized and discharged by the pump 31a and the pump 31b passes through the second heat medium flow switching device 33a and the second heat medium flow switching device 33b, and the use side heat exchanger 35a and the use side heat exchange. Flow into the vessel 35b.
  • 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 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. 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 heating operation of the indoor space 7 by the heat medium radiating heat to the indoor air or the cooling operation of the indoor space 7 by the heat medium absorbing heat from the indoor 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 the heating operation and has passed through the use-side heat exchanger 35 and whose temperature has decreased passes through the heat medium flow control device 34 and the first heat medium flow switching device 32, and the heat exchanger related to heat medium 25b. And is sucked into the pump 31b again.
  • the heat medium that has been used for the cooling operation and has passed through the use-side heat exchanger 35 and has risen 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 related to heat medium 25a. 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
  • a heat medium is circulated between the relay unit 2 and the indoor unit 3 (specifically, the use-side heat exchanger 35).
  • Some pipes 5 that connect the relay unit 2 and the indoor unit 3 have a length of about 50 m one way as used in, for example, a building multi-air conditioner.
  • the heat medium having the same temperature is simply cut off by closing the heat medium flow control device 34. Although fluctuations occur, it is expected that such fluctuations do not occur when the indoor unit 3 is started or when the operation is switched.
  • the heat medium temperature during heating operation is assumed to be 35 ° C. to 50 ° C. and the heat medium temperature during cooling operation is assumed to be 5 ° C. to 15 ° C.
  • the temperature of the heat medium staying in the pipe 5 of the stopped indoor unit 3 is reduced to the temperature corresponding to the outside air temperature.
  • the difference is about 50 ° C. at the maximum.
  • the mixed operation mode assuming the operation mode switching of the indoor unit 3, the temperature difference of the heat medium during the heating operation and the cooling operation is observed, and the mixed heat medium temperature difference is about 45 ° C. at the maximum.
  • the temperature difference of the heat medium to be mixed is about 30 ° C. at the maximum.
  • the operation mode switching between heating and cooling is taken as an example, but when the indoor unit 3 that is stopped is activated, the result is the same as the heating only operation mode or the cooling only operation mode.
  • the outside air temperature refers to the ambient temperature of the space in which the pipe 5 is installed, and is different from the space such as the back of the ceiling (the space 8 shown in FIG. 1) and the indoor space (the indoor space 7 shown in FIG. 1). The temperature of the space is assumed.
  • the pressure fluctuation on the refrigerant side is suppressed by the following method.
  • the heat medium is circulated through the indoor unit 3 scheduled to start operation, the refrigerant pressure in the refrigerant pipe 4 (the pressure detected by the pressure sensor 41), and the indoor unit 3 scheduled to start operation.
  • the pressure variation of the heat source side refrigerant is suppressed by adjusting the opening degree of the heat medium flow control device 34 with reference to the heat medium temperature (the temperature detected by the temperature sensor 37) of the pipe 5 connected to Executed.
  • the pressure fluctuation suppression operation is executed when the operation mode is switched or when the stopped indoor unit 3 is started.
  • the figure has shown the state which installed the two pressure sensors 41 as an example, two are not necessarily required.
  • FIG. 7 is a flowchart illustrating an example of a flow of a pressure fluctuation suppressing operation performed by the air conditioning apparatus 100. Based on FIG. 7, an example of the processing flow of the pressure fluctuation suppressing operation on the heat source side refrigerant side executed by the air conditioning apparatus 100 will be described. Here, the description will be made on the assumption that the pressure fluctuation suppression operation is performed when the usage side heat exchanger 35a is activated to perform a new heating operation during the heating operation. That is, the use side heat exchanger 35b of the indoor unit 3b is a target of the pressure fluctuation suppressing operation.
  • the control device 50 configures a heat-heat-medium circulation circuit that circulates the heat medium to the use-side heat exchanger 35b that is the subject of the pressure fluctuation-suppressing operation when the pressure fluctuation-suppressing operation is started. That is, the control device 50 determines the use side heat exchanger 35b as a target of pressure fluctuation suppression operation, and configures a heat heat medium circulation circuit that circulates the heat medium to the use side heat exchanger 35b.
  • the control device 50 slightly opens the heat medium flow control device 34b (step S101), and switches the first heat medium flow switching device 32b and the second heat medium flow switching device 33b to the heating side ( Steps S102 and S103).
  • opening the opening of the heat medium flow control device 34b slightly means that the opening is the minimum opening (first opening) at which a flow occurs in the heat medium.
  • the heat medium staying in the use side heat exchanger 35b and the pipe 5 is circulated by setting the heat medium flow control device 34b to the minimum opening.
  • the heating of the heat medium may be performed by either the heat exchanger related to heat medium 25a or the heat exchanger related to heat medium 25b.
  • the controller 50 circulates the staying heat medium, and then compares the pressure difference Pa (pressure difference detected by the pressure sensor 41) before and after the activation of the indoor unit 3b with a predetermined pressure P0 set in advance. (Step S104).
  • the control device 50 increases the opening degree of the heat medium flow control device 34b (to the second opening degree) (step S105).
  • the control device 50 keeps the heat medium flow control device 34b at the minimum opening. That is, the control device 50 controls the opening degree of the heat medium flow control device 34 on the basis of Pa so as to suppress the pressure fluctuation on the heat source side refrigerant side to the minimum.
  • the control device 50 sets the heat medium temperature Ta (detected temperature by the temperature sensor 37b) of the pipe 5 connected to the utilization side heat exchanger 35b of the newly activated indoor unit 3b and a predetermined temperature T0 set in advance. Are compared (step S106). When Ta is lower than T0 (step S106; YES), the process returns to step S104 again to continue the process. On the other hand, when Ta becomes equal to or greater than T0 (step S106; NO), the control device 50 determines that no more pressure fluctuation suppression operation is necessary, ends the pressure fluctuation suppression operation, and ends a series of processes.
  • P0 may set to within the range of 6 kgf / cm 2, preferably about pressure during normal operation by setting the order of 1 kgf / cm 2 It becomes possible to implement high-precision fluctuation suppression of the heat source side refrigerant that avoids fluctuation.
  • T0 may be set to be approximately the same as, for example, the heat medium return temperature (detected temperature by the temperature sensor 37a) of the use side heat exchanger 35a during heating.
  • the pressure fluctuation on the refrigerant side can be suppressed when the heating operation of the indoor unit 3b is started by performing the above-described control processing. Therefore, according to the air conditioning apparatus 100, it is possible to realize a highly reliable system construction that does not cause a pressure abnormality at the start of heating operation. In addition, according to the air conditioning apparatus 100, it is possible to prevent the temperature of the indoor unit 3a during the heating operation from being lowered by the control process as described above, and it is possible to obtain an effect that does not impair the comfort of the user.
  • FIG. 7 the pressure fluctuation suppression on the refrigerant side when the indoor unit 3b starts the heating operation has been described. However, the refrigerant when the indoor unit 3b performing the cooling operation in the mixed mode is switched to the heating operation. The pressure fluctuation suppression on the side can be similarly handled.
  • FIG. 8 is a flowchart showing another example of the processing flow of the pressure fluctuation suppressing operation executed by the air conditioning apparatus 100. Based on FIG. 8, another example of the processing flow of the pressure fluctuation suppression operation on the heat source side refrigerant side executed by the air conditioning apparatus 100 will be described. Here, the description will be made assuming that the pressure fluctuation suppression operation is performed when the use side heat exchanger 35a is started to newly perform the cooling operation while the use side heat exchanger 35a is in the cooling operation. That is, the use side heat exchanger 35b of the indoor unit 3b is a target of the pressure fluctuation suppressing operation. Since steps S201 to S205 shown in FIG. 8 are the same as steps S101 to S105 shown in FIG. 7, the description of steps S201 to S205 is omitted.
  • step S206 the control device 50 sets the heat medium temperature Ta (the temperature detected by the temperature sensor 37b) of the pipe 5 connected to the utilization side heat exchanger 35b of the newly activated indoor unit 3b, which is set in advance as predetermined.
  • the temperature T10 is compared.
  • Ta is higher than T10 (step S206; YES)
  • the process returns to step S204 again and the process is continued.
  • Ta becomes T10 or less (step S206; NO)
  • the control device 50 determines that no more pressure fluctuation suppression operation is necessary, ends the pressure fluctuation suppression operation, and ends a series of processes.
  • P0 may set to within the range of 6 kgf / cm 2, preferably about pressure during normal operation by setting the order of 1 kgf / cm 2 It becomes possible to implement high-precision fluctuation suppression of the heat source side refrigerant that avoids fluctuation.
  • T10 may be set to be approximately the same as, for example, the heat medium return temperature of the use side heat exchanger 35a during cooling (the temperature detected by the temperature sensor 37a). By not making the target temperature (T10) of the heat medium lower than the heat medium return temperature of the use side heat exchanger 35a during cooling, it is possible to suppress the cooling of the heat medium more than necessary, and to newly start the indoor unit 3b. Startup time can be shortened.
  • the pressure fluctuation on the refrigerant side can be suppressed when the cooling operation of the indoor unit 3b is started by performing the control process as described above. Therefore, according to the air conditioner 100, not only does the pressure abnormality not occur when the heating operation is started, but also the indoor unit 3 is started or the operation mode is switched while managing the refrigerant pressure in the refrigerant circuit A, so that the cooling operation is started. It is possible to realize a highly reliable system construction that does not cause an abnormal pressure on the refrigerant side even at times.
  • FIG. 8 illustrates the pressure fluctuation suppression on the refrigerant side when the indoor unit 3b starts the cooling operation, the refrigerant when the indoor unit 3b performing the heating operation in the mixed mode is switched to the cooling operation.
  • the pressure fluctuation suppression on the side can be similarly handled.
  • FIG. 9 is an explanatory diagram for explaining a method of increasing the opening degree of the heat medium flow control device 34.
  • a method of increasing the opening of the heat medium flow control device 34 executed by the air conditioning apparatus 100 specifically, a method of increasing the opening when increasing from the first opening to the second opening.
  • the increasing method of the opening degree of the six patterns of the heat medium flow control device 34 is illustrated in a table format.
  • the pattern of increasing the opening degree of the heat medium flow control device 34 may be any of the patterns shown in FIG. 9, but the control configuration, the influence on the system, the time until the end of the pressure fluctuation suppression operation, the possibility of a large pressure fluctuation, etc. It is good to decide comprehensively.
  • the first pattern is a fixed opening degree control pattern that emphasizes speed.
  • the outline is that the opening degree is fixed at a timing at which the opening degree of the heat medium flow control device 34 is increased, and the opening degree is kept until the pressure fluctuation suppressing operation is finished.
  • the fixed opening of the heat medium flow control device 34 is set to a relatively large opening.
  • the first pattern has an effect that the control configuration is simple, the influence on the system is great, the time until the end of the pressure fluctuation suppressing operation is early, and the possibility of occurrence of a large pressure fluctuation is high.
  • the second pattern is a fixed opening degree control pattern that emphasizes the influence of the system.
  • the outline is the same as the first pattern, in which the opening degree is fixed at a timing at which the opening degree of the heat medium flow control device 34 is increased, and the opening degree is kept until the pressure fluctuation suppressing operation is finished. is there.
  • the fixed opening of the heat medium flow control device 34 is set to a relatively small opening.
  • the second pattern has an effect that the control configuration is simple, the influence on the system is small, the time until the end of the pressure fluctuation suppression operation is slow, and the possibility of occurrence of a large pressure fluctuation is low.
  • the third pattern is an inching opening degree control pattern that emphasizes speed.
  • the outline is to increase the opening degree of the heat medium flow control device 34 by a certain opening degree at the timing of increasing the opening degree.
  • the inching width of the heat medium flow control device 34 is made relatively large.
  • the third pattern has an effect that the control configuration is normal, the influence on the system is large, the time until the end of the pressure fluctuation suppressing operation is early, and the possibility of occurrence of a large pressure fluctuation is high.
  • the fourth pattern is an inching opening degree control pattern that emphasizes the influence of the system.
  • the outline is the same as that of the third pattern, in which the opening degree of the heat medium flow control device 34 is increased by a certain opening degree at a timing of increasing the opening degree.
  • the inching width of the heat medium flow control device 34 is made relatively small.
  • the fourth pattern has an effect that the control configuration is normal, the influence on the system is small, the time until the end of the pressure fluctuation suppression operation is slow, and the possibility of occurrence of a large pressure fluctuation is low.
  • the fifth pattern is a target opening degree control pattern that emphasizes speed.
  • the fifth pattern is based on the heating operation start of the indoor unit 3b using T0 as the reference temperature.
  • the outline is that the opening degree of the heat medium flow control device 34 is determined from the difference between the reference temperature and the detected temperature, and the target opening degree is determined at a timing at which the opening degree of the heat medium flow control device 34 is increased.
  • Am indicates the target opening area
  • A1 indicates the current opening area.
  • the sixth pattern is a target opening degree control pattern that emphasizes the influence of the system.
  • the outline is the same as that of the fifth pattern.
  • the sixth pattern has an effect that the control configuration is complicated, the influence on the system is small, the time until the end of the pressure fluctuation suppression operation is normal, and the possibility of occurrence of a large pressure fluctuation is low.
  • FIG. FIG. 10 is a flowchart illustrating an example of a flow of a pressure fluctuation suppressing operation performed by the air-conditioning apparatus according to Embodiment 2 of the present invention. Based on FIG. 10, an example of the flow of the pressure fluctuation suppressing operation on the heat source side refrigerant side executed by the air-conditioning apparatus according to Embodiment 2 will be described. In the second embodiment, the difference from the first embodiment will be mainly described, and the same parts as those in the first embodiment are denoted by the same reference numerals. Further, the circuit configuration and operation mode of the air-conditioning apparatus according to Embodiment 2 are the same as those of the air-conditioning apparatus 100 according to Embodiment 1.
  • the case where the pressure fluctuation suppressing operation using the heat medium flow control device 34 is performed based on the refrigerant pressure in the refrigerant pipe 4 (the pressure detected by the pressure sensor 41) has been described as an example.
  • the temperature of the heat medium already flowing through the pipe 5 (detection by the temperature sensor 37) is not used as a reference, but the refrigerant pressure in the refrigerant pipe 4 (the pressure detected by the pressure sensor 41).
  • the pressure fluctuation suppressing operation using the heat medium flow control device 34 is performed with reference to (temperature) will be described as an example.
  • the heat medium is circulated through the indoor unit 3 scheduled to start operation, and the heat medium of the pipe 5 connected to the indoor unit 3 in operation.
  • the opening degree of the heat medium flow control device 34 is adjusted on the basis of the temperature (the temperature detected by the temperature sensor 37) so the pressure fluctuation of the heat source side refrigerant is suppressed.
  • the pressure fluctuation suppression operation is executed when the operation mode is switched or when the stopped indoor unit 3 is started.
  • the description will be made assuming that the pressure fluctuation suppression operation is performed when the use side heat exchanger 35b is activated to perform a new heating operation while the use side heat exchanger 35a is in the heating operation. That is, the use side heat exchanger 35b of the indoor unit 3b is a target of the pressure fluctuation suppressing operation.
  • the control device 50 configures a heat heat medium circulation circuit that circulates the heat medium to the use-side heat exchanger 35b that is a pressure fluctuation suppression operation target. That is, the control device 50 determines the use side heat exchanger 35b as a target of pressure fluctuation suppression operation, and configures a heat heat medium circulation circuit that circulates the heat medium to the use side heat exchanger 35b.
  • the control device 50 slightly opens the heat medium flow control device 34b (step S301), and switches the first heat medium flow switching device 32b and the second heat medium flow switching device 33b to the heating side ( Steps S302 and S303).
  • opening the opening of the heat medium flow control device 34b slightly means that the opening is the minimum opening (first opening) at which a flow occurs in the heat medium.
  • the heat medium staying in the use side heat exchanger 35b and the pipe 5 is circulated by setting the heat medium flow control device 34b to the minimum opening.
  • the heating of the heat medium may be performed by either the heat exchanger related to heat medium 25a or the heat exchanger related to heat medium 25b.
  • the controller 50 circulates the staying heat medium, and then the temperature difference Tb of the heat medium flowing through the pipe 5 connected to the indoor unit 3a in the heating operation before and after the start of the indoor unit 3b (by the temperature sensor 37).
  • the detected difference in the temperature of the heat medium is compared with a predetermined temperature T1 set in advance (step S304).
  • Tb is lower than T1 (step S304; YES)
  • the control device 50 increases the opening degree of the heat medium flow control device 34b (to the second opening degree) (step S305).
  • Tb is equal to or greater than T1 (step S304; NO)
  • the control device 50 keeps the heat medium flow control device 34b at the minimum opening. That is, the control device 50 controls the opening degree of the heat medium flow control device 34 based on Tb so as to suppress the pressure fluctuation on the heat source side refrigerant side to the minimum.
  • the control device 50 sets the heat medium temperature Ta (detected temperature by the temperature sensor 37b) of the pipe 5 connected to the utilization side heat exchanger 35b of the newly activated indoor unit 3b and a predetermined temperature T0 set in advance. Are compared (step S306). When Ta is lower than T0 (step S306; YES), the control device 50 returns to step S304 again and continues the process. On the other hand, when Ta becomes equal to or greater than T0 (step S306; NO), the control device 50 determines that no more pressure fluctuation suppression operation is necessary, ends the pressure fluctuation suppression operation, and ends the series of processes.
  • T1 may be set within a range up to about 10 ° C., for example, so as not to have a large influence on the control of the expansion device 26, and preferably about 1.5 ° C. It is possible to suppress the high-pressure fluctuation of the avoided refrigerant with high accuracy.
  • T0 may be set to be approximately the same as, for example, the heat medium return temperature (detected temperature by the temperature sensor 37a) of the use side heat exchanger 35a during heating. By not setting the target temperature (T0) of the heat medium to be higher than the heat medium return temperature of the heating-side heat exchanger 35a during heating, it is possible to suppress heating of the heat medium more than necessary and to newly start the indoor unit 3b. Startup time can be shortened.
  • the pressure control on the refrigerant side is suppressed when the heating operation of the indoor unit 3b is started by performing the control process as described above. Can do. That is, according to the air-conditioning apparatus according to Embodiment 2, the indoor unit 3 is activated or the operation mode is switched while managing the refrigerant pressure in the refrigerant circulation circuit A, so that no pressure abnormality on the refrigerant side occurs. System construction can be realized. Moreover, according to the air conditioning apparatus which concerns on Embodiment 2, the fall of the blowing temperature of the indoor unit 3a in heating operation can also be prevented by the above control processes, and the effect which does not impair a user's comfort is also obtained. Obtainable.
  • FIG. 10 illustrates the refrigerant-side pressure fluctuation suppression when the indoor unit 3b starts the heating operation, but the refrigerant-side pressure fluctuation suppression when the indoor unit 3b starts the cooling operation is described in Step S306. Can be dealt with by changing the relationship to the relationship as shown in step S206 of FIG.
  • FIG. FIG. 11 is a flowchart illustrating an example of a flow of a pressure fluctuation suppressing operation performed by the air-conditioning apparatus according to Embodiment 3 of the present invention. Based on FIG. 11, an example of the flow of the pressure fluctuation suppressing operation on the heat source side refrigerant side executed by the air-conditioning apparatus according to Embodiment 3 will be described.
  • the difference from the first embodiment will be mainly described, and the same parts as those in the first embodiment are denoted by the same reference numerals.
  • the circuit configuration and operation mode of the air-conditioning apparatus according to Embodiment 3 are the same as those of the air-conditioning apparatus 100 according to Embodiment 1.
  • the case where the pressure fluctuation suppressing operation using the heat medium flow control device 34 is performed based on the refrigerant pressure in the refrigerant pipe 4 (the pressure detected by the pressure sensor 41) has been described as an example.
  • the heat medium flow rate adjustment device 34 is set according to the capacity of the indoor unit 3 to be additionally activated, instead of using the refrigerant pressure in the refrigerant pipe 4 (the pressure detected by the pressure sensor 41) as a reference.
  • the case where the used pressure fluctuation suppression operation is performed will be described as an example. Note that the pressure fluctuation suppression operation is executed when the operation mode is switched or when the stopped indoor unit 3 is started.
  • the description will be made assuming that the pressure fluctuation suppression operation is performed when the use side heat exchanger 35b is activated to perform a new heating operation while the use side heat exchanger 35a is in the heating operation. That is, the use side heat exchanger 35b of the indoor unit 3b is a target of the pressure fluctuation suppressing operation.
  • the control device 50 configures a heat heat medium circulation circuit that circulates the heat medium to the use-side heat exchanger 35b that is a pressure fluctuation suppression operation target. That is, the control device 50 determines the use side heat exchanger 35b as a target of pressure fluctuation suppression operation, and configures a heat heat medium circulation circuit that circulates the heat medium to the use side heat exchanger 35b.
  • the control device 50 slightly opens the heat medium flow control device 34b (step S401), and switches the first heat medium flow switching device 32b and the second heat medium flow switching device 33b to the heating side ( Steps S402 and S403).
  • opening the opening of the heat medium flow control device 34b slightly means that the opening is the minimum opening (first opening) at which a flow occurs in the heat medium.
  • the heat medium staying in the use side heat exchanger 35b and the pipe 5 is circulated by setting the heat medium flow control device 34b to the minimum opening.
  • the heating of the heat medium may be performed by either the heat exchanger related to heat medium 25a or the heat exchanger related to heat medium 25b.
  • the control device 50 sets the heat medium temperature Ta (detected temperature by the temperature sensor 37b) of the pipe 5 connected to the use side heat exchanger 35b of the newly activated indoor unit 3b and a predetermined temperature T0 set in advance. Compare (step S404). When Ta is lower than T0 (step S404; YES), the controller 50 increases the opening of the heat medium flow control device 34b in proportion to the capacity of the newly activated indoor unit 3b (to the second opening). Fix (step S405). On the other hand, when Ta becomes equal to or greater than T0 (step S404; NO), the control device 50 determines that no more pressure fluctuation suppression operation is necessary, ends the pressure fluctuation suppression operation, and ends the series of processes.
  • the fixed opening degree of the heat medium flow control device 34 derives an opening degree that can suppress the pressure fluctuation on the refrigerant side, for example, in the ratio of the capacity of the indoor unit 3 in operation and the capacity of the indoor unit to be started.
  • the opening degree of the heat medium flow control device 34 may be determined by the capacity ratio of the indoor unit 3 to be operated / started.
  • T0 may be set to be approximately the same as, for example, the heat medium return temperature (detected temperature by the temperature sensor 37a) of the use side heat exchanger 35a during heating.
  • the target temperature (T0) of the heat medium By not setting the target temperature (T0) of the heat medium to be higher than the heat medium return temperature of the heating-side heat exchanger 35a during heating, it is possible to suppress heating of the heat medium more than necessary and to newly start the indoor unit 3b. Startup time can be shortened.
  • the air-conditioning apparatus As described above, according to the air-conditioning apparatus according to Embodiment 3, when the heating operation of the indoor unit 3b is started, the pressure fluctuation on the refrigerant side is suppressed by performing the control process as described above. Can do. Therefore, according to the air-conditioning apparatus according to Embodiment 3, the indoor unit 3 is started or the operation mode is switched while managing the refrigerant pressure in the refrigerant circuit A, so that the pressure abnormality on the refrigerant side does not occur. System construction can be realized. Moreover, according to the air conditioning apparatus which concerns on Embodiment 3, the fall of the blowing temperature of the indoor unit 3a in heating operation can also be prevented by the above control processes, and the effect which does not impair a user's comfort is also obtained.
  • the heat medium flow control device 34 is used as a means for adjusting the flow rate of the heat medium.
  • the flow rate of the heat medium is adjusted by inputting a control command directly to the pump 31. May be.
  • 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
  • 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.
  • the air conditioning apparatus not only the heat source side refrigerant is circulated to the indoor unit 3 or the vicinity of the indoor unit 3 but also safety is improved, and a highly reliable system is also provided. Construction can be realized and energy efficiency can be improved reliably. Further, according to the air conditioner according to Embodiments 1 to 3, the pipe 5 can be shortened, so that energy saving can be achieved. Furthermore, according to the air conditioning apparatus according to Embodiments 1 to 3, the connection piping (refrigerant piping 4 and piping 5) between the outdoor unit 1 and the relay unit 2 or the indoor unit 3 can be reduced, and workability can be improved.

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

Abstract

L'invention porte sur un dispositif climatiseur (100) possédant un dispositif de commande (50) qui ouvre légèrement un dispositif (34b) de réglage du débit d'un milieu caloporteur de telle sorte qu'une quantité prédéterminée de milieu caloporteur atteint l'échangeur de chaleur côté utilisation (35b) avant que l'échangeur de chaleur côté utilisation (35b) ne commence à fonctionner ou qu'il ne commute sur le mode fonctionnement, de telle sorte que l'opération de suppression des fluctuations de pression destinée à supprimer les fluctuations de pression sur le côté circuit (A) de cycle du fluide frigorigène est exécutée.
PCT/JP2011/002932 2011-05-26 2011-05-26 Dispositif climatiseur Ceased WO2012160605A1 (fr)

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JP2013516078A JP5642270B2 (ja) 2011-05-26 2011-05-26 空気調和装置
EP11866029.9A EP2716997B1 (fr) 2011-05-26 2011-05-26 Dispositif climatiseur

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0571770A (ja) * 1991-09-11 1993-03-23 Matsushita Refrig Co Ltd 多室冷暖房装置
JP2000227242A (ja) 1999-02-02 2000-08-15 Oki Electric Ind Co Ltd 空調設備の予冷予熱制御方法
JP2004060956A (ja) * 2002-07-26 2004-02-26 Sanyo Electric Co Ltd 熱移動装置及びその運転方法
WO2011052049A1 (fr) * 2009-10-28 2011-05-05 三菱電機株式会社 Dispositif de conditionnement d'air

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010049999A1 (fr) * 2008-10-29 2010-05-06 三菱電機株式会社 Conditionneur d'air
EP3290826B1 (fr) * 2008-10-29 2021-09-01 Mitsubishi Electric Corporation Climatiseur d'air
EP2431684B1 (fr) * 2009-05-13 2020-04-15 Mitsubishi Electric Corporation Appareil de conditionnement d'air

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0571770A (ja) * 1991-09-11 1993-03-23 Matsushita Refrig Co Ltd 多室冷暖房装置
JP2000227242A (ja) 1999-02-02 2000-08-15 Oki Electric Ind Co Ltd 空調設備の予冷予熱制御方法
JP2004060956A (ja) * 2002-07-26 2004-02-26 Sanyo Electric Co Ltd 熱移動装置及びその運転方法
WO2011052049A1 (fr) * 2009-10-28 2011-05-05 三菱電機株式会社 Dispositif de conditionnement d'air

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EP2716997A1 (fr) 2014-04-09

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