EP2515055B1 - Climatiseur - Google Patents

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Publication number
EP2515055B1
EP2515055B1 EP09852226.1A EP09852226A EP2515055B1 EP 2515055 B1 EP2515055 B1 EP 2515055B1 EP 09852226 A EP09852226 A EP 09852226A EP 2515055 B1 EP2515055 B1 EP 2515055B1
Authority
EP
European Patent Office
Prior art keywords
indoor
side heat
unit
refrigerant
flow control
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.)
Not-in-force
Application number
EP09852226.1A
Other languages
German (de)
English (en)
Other versions
EP2515055A1 (fr
EP2515055A4 (fr
Inventor
Kazuyoshi Shinozaki
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
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP2515055A1 publication Critical patent/EP2515055A1/fr
Publication of EP2515055A4 publication Critical patent/EP2515055A4/fr
Application granted granted Critical
Publication of EP2515055B1 publication Critical patent/EP2515055B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
    • 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
    • F25B2313/006—Compression machines, plants or systems with reversible cycle not otherwise provided for two pipes connecting the outdoor side to the indoor side with multiple indoor units
    • 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
    • F25B2313/02741—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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/23—Separators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves

Definitions

  • the present invention is related to an air-conditioning apparatus, and, in particular, a multi-room heat pump air-conditioning apparatus that is capable of selectively heating and cooling each indoor unit and simultaneously operating indoor units performing cooling and indoor units performing heating, the multi-room heat pump air-conditioning apparatus connecting to a plurality of indoor units.
  • an air-conditioning apparatus capable of simultaneous cooling and heating operation As a conventional air-conditioning apparatus capable of selectively heating and cooling each indoor unit and simultaneously operating indoor units performing cooling and indoor units performing heating (hereinafter referred to as an air-conditioning apparatus capable of simultaneous cooling and heating operation), for example, the following has been proposed (for example, refer to Patent Literature 1): "an air-conditioning apparatus capable of simultaneous heating and cooling operation, wherein one heat source unit consisting of a compressor, a four-way switching valve, a heat source unit-side heat exchanger, an accumulator, and the like is connected via first and second connecting pipings to a plurality of indoor units each consisting of an indoor-side heat exchanger, a first flow control device, and the like; a first branching unit that switchably connects one end of the indoor-side heat exchangers of the plurality of indoor units to the first connecting piping or the second connecting piping is connected via a second flow control device to a second branching unit which is connected to the other end of the indoor-side heat exchangers
  • Patent Literature 2 discloses an air-conditioner, which allows to inhibit both high pressure and low pressure to a minimum even when the indoor equipment carries out a small capacity heating operation. From Patent Literature D3, another air conditioner is known with a plurality of room units which are connected to one heat source unit. Cooling and heating can be effected selectively for each room unit.
  • the conventional air-conditioning apparatus capable of simultaneous cooling and heating operation has the following problems.
  • the heat source unit (outdoor) side heat exchanger functions as an evaporator.
  • the heat exchangers of the indoor units (indoor-side heat exchangers) which are cooling also function as an evaporator. Accordingly, the heat source unit-side heat exchanger and the indoor-side heat exchangers functioning as an evaporator are serially connected. At this time, if the temperature of air sucked in by the heat source unit-side heat exchanger (that is, the outside air temperature) is low, the evaporation temperature of the indoor-side heat exchangers functioning as an evaporator will drop as the evaporation temperature of the heat source unit-side heat exchanger drops.
  • an expansion device in order to prevent drop of the evaporation temperature of the indoor-side heat exchangers functioning as an evaporator, an expansion device has been provided on an outlet-side piping of the indoor-side heat exchangers (more specifically, in each piping that is on the refrigerant outlet side when functioning as an evaporator).
  • the pressure loss on the evaporator outlet side is increased by adjusting the expansion device in order to prevent drop of the evaporation temperature of the indoor-side heat exchangers functioning as an evaporator.
  • an expansion device is provided for each indoor-side heat exchanger, and thus the throttling of each expansion device varies.
  • the sensible heat load is large and the latent heat load (load when the sensible heat load is removed from the cooling load) is small, there has been a problem in terms of the balance of the refrigeration cycle in that the evaporation temperature of the indoor-side heat exchangers drops leading to the indoor-side heat exchangers to freeze in which water leaks are caused.
  • the necessary sensible heat capacity it is necessary to use a specialized indoor unit that has large sensible heat ratios.
  • the sensible heat load on the indoor side changes such as when computers are increased, it is necessary to exchange the indoor units with ones tailored to the sensible heat load in each case, and, thus, leading to excessive cost.
  • an objective of the present invention is to provide an air-conditioning apparatus that can, even when the outside air temperature is low, prevent the formation of frost on the indoor-side heat exchangers functioning as an evaporator and operate continuously and stably, and can inexpensively obtain the necessary sensible heat capacity using unmodified normal indoor units even when a portion of the indoor units is used in a place that has a large sensible heat load such as a computer room.
  • the air-conditioning apparatus of the present invention is an air-conditioning apparatus that includes a heat source unit having a compressor, a four-way switching valve, and a heat source unit-side heat exchanger that is connected to the four-way switching valve; a plurality of indoor units each having an indoor-side heat exchanger and a first flow control device connected to one end of the indoor-side heat exchanger; and a relay unit that connects the heat source unit to the indoor units, and that is capable of simultaneous heating and cooling operation in which each of the indoor units selectively performing a cooling operation or a heating operation.
  • the relay unit is connected to the heat source unit by a first connecting piping through which a refrigerant that flows out to the heat source unit flows and a second connecting piping through which the refrigerant that flows in from the heat source unit flows.
  • the relay unit comprises a first branching unit that switchably connects the other end of each of the indoor-side heat exchangers to the first connecting piping or the second connecting piping, a second branching unit that switchably connects each first flow control device to the first connecting piping or the second connecting piping, and a flow control unit provided to the first connecting piping that controls a flow amount of the refrigerant that flows through the indoor-side heat exchangers functioning as an evaporator.
  • the flow amount of a refrigerant that flows through the indoor-side heat exchangers functioning as an evaporator is controlled by the flow control unit. Therefore, the evaporation temperature of the indoor-side heat exchangers functioning as an evaporator can be raised, and thus the sensible heat capacity of the indoor-side heat exchangers functioning as an evaporator can be improved.
  • the air-conditioning apparatus of the present invention can, even when the outside air temperature is low, prevent the formation of frost on the indoor-side heat exchangers functioning as an evaporator and operate continuously and stably, and can inexpensively obtain the necessary sensible heat capacity using unmodified normal indoor units even when a portion of the indoor units is used in a place that has a large sensible heat load such as a computer room.
  • Fig. 1 is a diagram of a refrigerant circuit showing an air-conditioning apparatus according to Embodiment 1 of the present invention.
  • Fig. 1 explains a case in which three indoor units and one relay unit are connected to one heat source unit. However, the same effects can also be obtained when two or more heat source units, two or more indoor units, and two or more relay units are connected.
  • the air-conditioning apparatus 100 is an air-conditioning apparatus capable of a simultaneous heating and cooling operation in which a cooling operation can be selected in one or some indoor units while a heating operation can be selected in the remaining one or some indoor units.
  • the air-conditioning apparatus 100 includes a heat source unit A, a relay unit E, and indoor units B, C, and D that are connected in parallel to each other.
  • the heat source unit A includes a compressor 1, a four-way switching valve 2, a heat source unit-side heat exchanger 3, a flow switching device 30, and the like.
  • the discharge side of the compressor 1 is connected to a connection port of the four-way switching valve 2.
  • the suction side of the compressor 1, one end of the heat source unit-side heat exchanger 3, and the flow switching device 30 are connected to the remaining connection ports of the four-way switching valve 2.
  • the four-way switching valve 2 switches the passage of a refrigerant discharged from the compressor 1 to a passage flowing to the heat source unit-side heat exchanger 3 or a passage flowing to the flow switching device 30.
  • the other end of the heat source unit-side heat exchanger 3 is connected to the flow switching device 30.
  • the flow switching device 30 includes four check valves (check valve 23 to check valve 26), and the four-way switching valve 2, the heat source unit-side heat exchanger 3, one end of a first connecting piping 21, and one end of a second connecting piping 22 are connected thereto.
  • the check valve 23 is provided between the heat source unit-side heat exchanger 3 and the second connecting piping 22, and permits the flow of the refrigerant only from the heat source unit-side heat exchanger 3 to the second connecting piping 22.
  • the check valve 24 is provided between the four-way switching valve 2 and the first connecting piping 21, and permits the flow of the refrigerant only from the first connecting piping 21 to the four-way switching valve 2.
  • the check valve 25 is provided between the four-way switching valve 2 and the second connecting piping 22, and permits the flow of the refrigerant only from the four-way switching valve 2 to the second connecting piping 22.
  • the check valve 26 is provided between the heat source unit-side heat exchanger 3 and the first connecting piping 21, and permits the flow of the refrigerant only from the first connecting piping 21 to the heat source unit-side heat exchanger 3.
  • the other end of the second connecting piping 22 branches and is connected to a first branching unit 10 and a second branching unit 11 of the relay unit E explained below.
  • the other end of the first connecting piping 21 is connected to the first branching unit 10 of the relay unit E explained below.
  • the refrigerant discharged from the compressor 1 always flows into the relay unit E through the second connecting piping 22, and the refrigerant that flows out from the relay unit E always passes through the first connecting piping 21. Therefore, it is possible to make the pipe diameter of the second connecting piping 22 narrower than the pipe diameter of the first connecting piping 21.
  • Each of the indoor units B, C, and D has the same constitution.
  • the indoor unit B includes an indoor-side heat exchanger 5B.
  • One end of the indoor-side heat exchanger 5B is connected to a second branching unit 11 of the relay unit E explained below via a second indoor unit-side connecting piping 7B.
  • a flow control device 9B is provided to the second indoor unit-side connecting piping 7B.
  • a temperature sensor 4B for detecting the temperature of the refrigerant flowing through the piping (or the piping temperature) is provided between the flow control device 9B and the indoor-side heat exchanger 5B.
  • the other end of the indoor-side heat exchanger 5B is connected to the first branching unit 10 of the relay unit E explained below via a first indoor unit-side connecting piping 6B.
  • the indoor unit C includes an indoor-side heat exchanger 5C.
  • One end of the indoor-side heat exchanger 5C is connected to the second branching unit 11 of the relay unit E explained below via a second indoor unit-side connecting piping 7C.
  • a flow control device 9C is provided to the second indoor unit-side connecting piping 7C.
  • a temperature sensor 4C for detecting the temperature of the refrigerant flowing through the piping (or the piping temperature) is provided between the flow control device 9C and the indoor-side heat exchanger 5C.
  • the other end of the indoor-side heat exchanger 5C is connected to the first branching unit 10 of the relay unit E explained below via a first indoor unit-side connecting piping 6C.
  • the indoor unit D includes an indoor-side heat exchanger 5D.
  • One end of the indoor-side heat exchanger 5D is connected to the second branching unit 11 of the relay unit E explained below via a second indoor unit-side connecting piping 7D.
  • a flow control device 9D is provided to the second indoor unit-side connecting piping 7D.
  • a temperature sensor 4D for detecting the temperature of the refrigerant flowing through the piping (or the piping temperature) is provided between the flow control device 9D and the indoor-side heat exchanger 5D.
  • the other end of the indoor-side heat exchanger 5D is connected to the first branching unit 10 of the relay unit E explained below via a first indoor unit-side connecting piping 6D.
  • the flow control devices 9 (9B to 9D) correspond to the first flow control devices in the present invention.
  • the opening degree of the flow control devices 9 (9B to 9D) is controlled as follows. If the corresponding indoor units (B to D) are in cooling operation, the opening degree of the flow control devices 9 (9B to 9D) is controlled based on the degree of superheat at the outlet side of the indoor-side heat exchangers 5 (5B to 5D). If the corresponding indoor units (B to D) are in heating operation, the opening degree of the flow control devices 9 (9B to 9D) is controlled based on the degree of supercooling at the outlet side of the indoor-side heat exchangers 5 (5B to 5D).
  • the relay unit E includes the first branching unit 10, the second branching unit 11, a gas-liquid separating device 12, a flow control device 13, a flow control device 15, a heat exchange portion 16, a flow control unit 31, and the like.
  • the first branching unit 10 includes a number of valve devices 8a and 8b in accordance with the number of indoor units.
  • Embodiment 1 includes 3 sets of valve devices 8a and 8b (valve devices 8aB and 8bB, valve devices 8aC and 8bC, and valve devices 8aD and 8bD).
  • the ends at one side of the valve devices 8aB and 8bB are connected to the indoor-side heat exchanger 5B via the first indoor unit-side connecting piping 6B.
  • the other end of the valve device 8aB is connected to the first connecting piping 21, and the other end of the valve device 8bB is connected to the second connecting piping 22.
  • valve devices 8aC and 8bC are connected to the indoor-side heat exchanger 5C via the first indoor unit-side connecting piping 6C.
  • the other end of the valve device 8aC is connected to the first connecting piping 21, and the other end of the valve device 8bC is connected to the second connecting piping 22.
  • valve devices 8aD and 8bD are connected to the indoor-side heat exchanger 5D via the first indoor unit-side connecting piping 6D.
  • the other end of the valve device 8aD is connected to the first connecting piping 21, and the other end of the valve device 8bD is connected to the second connecting piping 22.
  • the first branching unit 10 switches the passage to which the indoor-side heat exchangers 5 (5B to 5D) are connected to between the first connecting piping 21 and the second connecting piping 22 by controlling the opening/closing of the valve devices 8a and the valve devices 8b.
  • the second branching unit 11 includes check valves 17 and 18, which are in an anti-parallel relationship with each other, according to the number of indoor units. Each check valve 17 permits the refrigerant to flow only in the direction into the indoor units. Each check valve 18 permits the refrigerant to flow only in the direction out from the indoor units. In Embodiment 1, the second branching unit 11 includes three sets of check valves 17 and 18 (check valves 17B and 18B, check valves 17C and 18C, and check valves 17D and 18D).
  • the ends at one side of the check valves 17B and 18B are connected to the indoor-side heat exchanger 5B via the second indoor unit-side connecting piping 7B.
  • the other end of the check valve 17B is connected to a first junction 17A, and the other end of the check valve 18B is connected to a second junction 18A.
  • the ends at one side of the check valves 17C and 18C are connected to the indoor-side heat exchanger 5C via the second indoor unit-side connecting piping 7C.
  • the other end of the check valve 17C is connected to the first junction 17A, and the other end of the check valve 18C is connected to the second junction 18A.
  • the ends at one side of the check valves 17D and 18D are connected to the indoor-side heat exchanger 5D via the second indoor unit-side connecting piping 7D.
  • the other end of the check valve 17D is connected to the first junction 17A, and the other end of the check valve 18D is connected to the second junction 18A.
  • the first junction 17A is also connected to an end of the second connecting piping 22.
  • the second junction 18A is also connected to the middle of the second connecting piping 22 (the second connecting piping 22 between the flow control device 13 and the heat exchange portion 16 to be explained later).
  • the second connecting piping 22 branches and is connected to the first branching unit 10 and the second branching unit 11.
  • the gas-liquid separating device 12 is provided to this branching portion.
  • the flow control device 13 and the heat exchange portion 16 are provided from the upstream side of the refrigerant flow.
  • bypass piping 14 One end of a bypass piping 14 is connected to the second connecting piping 22 between the heat exchange portion 16 and the second branching unit 11. The other end of the bypass piping 14 is connected to the first connecting piping 21.
  • the heat exchange portion 16 described above is provided in the bypass piping 14. In other words, in the heat exchange portion 16, heat is exchanged between the refrigerant that flows through the second connecting piping 22 and the refrigerant that flows through the bypass piping 14.
  • the flow control device 15 is also provided in the bypass piping 14 on the refrigerant flow upstream side of the heat exchange portion 16.
  • the bypass piping 14 constitutes a portion of the first connecting piping 21.
  • a flow control unit 31 is provided to the first connecting piping 21 between the first branching unit 10 and the heat source unit A.
  • the flow control unit 31 includes a valve device 19 capable of opening/closing and a capillary tube 20 that is connected in parallel to the valve device 19.
  • the flow control unit 31 controls the flow amount of the refrigerant flowing through the first connecting piping 21 by opening/closing the valve device 19. Thereby, the flow amount of the refrigerant flowing through the indoor-side heat exchangers 5 functioning as an evaporator (the indoor-side heat exchangers 5 discharging the refrigerant to the first branching unit 10) is controlled.
  • a temperature sensor 28 for detecting the temperature of the refrigerant flowing through the piping (or the piping temperature) is provided in the first connecting piping between the flow control unit 31 and the first branching unit 10.
  • the flow control unit 31 is provided to the first connecting piping 21, which is the piping after the refrigerant flowing through each of the first indoor unit-side connecting pipings 6B to 6D has merged (more specifically, to the first connecting piping 21, which is on the refrigerant flow upstream side from the merging section of the first connecting piping 21 and the bypass piping 14).
  • the temperature sensor 28 is provided on the refrigerant flow upstream side of the flow control unit 31.
  • each of the flow control units 31 (more specifically, the valve devices 19) is made to perform a throttle operation
  • the throttle control of each flow control devices 9B to 9D would change in accordance with the change in the flow amount of the refrigerant in each of the indoor-side heat exchangers owing to each throttle operation. Therefore, the operation of the air-conditioning apparatus would become unstable.
  • the flow control unit 31 is provided to the first connecting piping 21 (more specifically, to the first connecting piping 21, which is on the refrigerant flow upstream side of the merging section of the first connecting piping 21 and the bypass piping 14), and a temperature sensor 28 is provided on the refrigerant flow upstream side of the flow control unit 31. Therefore, the flow amount of the refrigerant flowing through the indoor-side heat exchangers 5 functioning as an evaporator can be controlled by controlling one actuator (the valve device 19) in accordance with a specific detected temperature (temperature detected by one temperature sensor 28). Thus, the air-conditioning apparatus 100 can operate stably.
  • the air-conditioning apparatus 100 can operate stably, the control can be simplified, and the piping constitution can also be simplified.
  • the air-conditioning apparatus 100 performs mainly three types of operations. Basically, the air-conditioning apparatus 100 performs a cooling only operation, a heating only operation, and a simultaneous cooling and heating operation.
  • the cooling only operation is an operation in which all of the plurality of indoor units are either in cooling operation or stopped.
  • the heating only operation is an operation in which all of the plurality of indoor units are either in heating operation or stopped.
  • the simultaneous cooling and heating operation is an operation mode in which one or some of the plurality of indoor units are in cooling operation, and the remaining one or some are in heating operation (of course, one or some of the indoor units may be in a stopped state).
  • Fig. 2 is a diagram of the operation state during the cooling only operation and the heating only operation in the air-conditioning apparatus according to Embodiment 1 of the present invention.
  • the solid arrows in Fig. 2 show the flow of the refrigerant in the cooling only operation.
  • Fig. 2 shows a case in which all of the indoor units B, C, and D are in cooling operation.
  • High-temperature, high-pressure gas refrigerant that is discharged from the compressor 1 passes through the four-way switching valve 2 and flows into the heat source unit-side heat exchanger 3.
  • the refrigerant which has flowed into the heat source unit-side heat exchanger 3 exchanges heat with the outdoor air and is condensed, passes through the check valve 23 and the second connecting piping 22, and flows into the relay unit E.
  • the refrigerant which has flowed into the relay unit E passes through the gas-liquid separating device 12 and the flow control device 13 in that order, and flows into the heat exchange portion 16.
  • the refrigerant that has flowed into the heat exchange portion 16 is cooled by the refrigerant flowing through the bypass piping 14, obtains a sufficient degree of supercooling, and flows into the second branching unit 11.
  • the refrigerant which has flowed into the second branching unit 11 is diverged at the first junction 17A, flows into the second indoor unit-side connecting pipings 7B, 7C, and 7D, and flows into each of the flow control devices 9 (9B to 9D).
  • the refrigerant which has flowed into the flow control devices 9 (9B to 9D) is decompressed to a predetermined low pressure based on the degree of superheat of the outlets of each of the indoor-side heat exchangers 5, and flows into each indoor unit B, C, and D (each indoor-side heat exchanger 5).
  • the refrigerant which has flowed into each indoor unit B, C, and D exchanges heat with the indoor air in the indoor-side heat exchangers 5, is evaporated and gasified, and cools the indoors.
  • the refrigerant which has entered a gaseous state passes through the first indoor unit-side connecting pipings 6B, 6C, and 6D, the first branching unit 10 (more specifically, the valve devices 8aB, 8aC, and 8aD), the flow control unit 31, and the first connecting piping 21, and flows into the heat source unit A.
  • the refrigerant that has flowed into the heat source unit A passes through the check valve 24 and the four-way switching valve 2 and is sucked into the compressor 1.
  • the valve devices 8aB, 8aC, and 8aD are in an opened state
  • the valve devices 8bB, 8bC, and 8bD are in a closed state.
  • the refrigerant since the first connecting piping 21 is under low pressure, and the second connecting piping 22 is under high pressure, the refrigerant necessarily flows to the check valve 23 and the check valve 24.
  • a portion of the refrigerant that has passed through the flow control device 13 flows into the bypass piping 14.
  • This portion of the refrigerant is decompressed to low pressure in the flow control device 15 and flows into the heat exchange portion 16.
  • the refrigerant that has been decompressed in the flow control device 15 cools the refrigerant flowing through the second connecting piping 22, evaporates, and flows into the first connecting piping 21.
  • This refrigerant merges with the refrigerant that has flowed out from the flow control unit 31, passes through the check valve 24 and the four-way switching valve 2, and is sucked into the compressor 1.
  • the flow control unit 31 is controlled as follows.
  • control is performed to close the valve device 19. If the evaporation temperature of the indoor-side heat exchangers 5B, 5C, and 5D of the indoor units B, C, and D that are about to perform cooling is to be set to normal temperature or lowered, control is performed to open the valve device 19. In other words, if the valve device 19 is opened, the flow through area of the indoor-side heat exchangers 5B, 5C, and 5D increases, and thus the pressure loss of the indoor-side heat exchangers 5B, 5C, and 5D can be reduced.
  • the evaporation temperature of the indoor-side heat exchangers 5B, 5C, and 5D can be set to normal temperature or lowered.
  • the valve device 19 if the valve device 19 is closed, the refrigerant flows through the capillary tube 20, and thus the pressure loss of the indoor-side heat exchangers 5B, 5C, and 5D increases. Therefore, the evaporation temperature of the indoor-side heat exchangers 5B, 5C, and 5D can be increased. In this way, the evaporation temperature of the indoor-side heat exchangers 5B, 5C, and 5D can be selectively changed.
  • the air-conditioning apparatus 100 can increase the evaporation temperature of the indoor-side heat exchangers 5B, 5C, and 5D by controlling the flow control unit 31.
  • the air-conditioning apparatus 100 of Embodiment 1 can prevent such defects by increasing the evaporation temperature of the indoor-side heat exchangers 5B, 5C, and 5D.
  • Fig. 2 shows the heating only operation.
  • the broken-line arrows in Fig. 2 show the flow of the refrigerant during the heating only operation.
  • Fig. 2 shows a case in which all of the indoor units B, C, and D are in heating operation.
  • a high-temperature, high-pressure gas refrigerant that is discharged from the compressor 1 passes through the four-way switching valve 2, the check valve 25, and the second connecting piping 22, and flows into the relay unit E.
  • the refrigerant that has flowed into the relay unit E passes through the gas-liquid separating device 12 and flows into the first branching unit 10.
  • the refrigerant which has flowed into the first branching unit 10 passes through the valve devices 8bB, 8bC, and 8bD; the first indoor unit-side connecting pipings 6B, 6C, and 6D, and flows into each indoor unit B, C, and D (each indoor-side heat exchanger 5).
  • each indoor unit B, C, and D each indoor-side heat exchanger 5 exchanges heat with the indoor air in the indoor-side heat exchangers 5, and is condensed and liquefied to heat the indoors.
  • the refrigerant which has entered a liquid state passes through the flow control devices 9 controlled by the degree of supercooling of the outlets of each indoor-side heat exchanger 5, the second indoor unit-side connecting pipings 7B, 7C, and 7D, and flows into the second branching unit 11.
  • the refrigerant which has flowed into the second branching unit 11 passes through the check valves 18B, 18C and 18D, and merges at the second junction 18A.
  • the refrigerant which has merged passes through the second connecting piping 22 and the bypass piping 14, flows into the flow control device 15, and is decompressed to a low pressure two-phase gas-liquid.
  • the refrigerant that has been decompressed to a low pressure passes through the bypass piping 14, the heat exchange portion 16, and the first connecting piping 21, and flows into the heat source unit A.
  • the refrigerant that has flowed into the heat source unit A passes through the check valve 26, and flows into the heat source unit-side heat exchanger 3.
  • the refrigerant that has flowed into the heat source unit-side heat exchanger 3 exchanges heat with the outdoor air and evaporates into a gaseous state, and passes through the four-way switching valve 2 and is sucked into the compressor 1.
  • valve devices 8aB, 8aC, and 8aD are in a closed state, and the valve devices 8bB, 8bC, and 8bD are in an opened state.
  • the refrigerant since the first connecting piping 21 is under low pressure, and the second connecting piping 22 is under high pressure, the refrigerant necessarily flows to the check valve 25 and the check valve 26.
  • Fig. 3 is a diagram of the operation state during a heating main operation in the air-conditioning apparatus according to Embodiment 1 of the present invention.
  • the solid arrows in Fig. 3 show the flow of the refrigerant during the heating main operation.
  • Fig. 3 shows a case in which the indoor units B and C are in heating operation, and the indoor unit D is in cooling operation.
  • a high-temperature, high-pressure gas refrigerant that is discharged from the compressor 1 passes through the four-way switching valve 2, the check valve 25, and the second connecting piping 22, and flows into the relay unit E.
  • the refrigerant that has flowed into the relay unit E passes through the gas-liquid separating device 12 and flows into the first branching unit 10.
  • the refrigerant which has flowed into the first branching unit 10 passes through the valve devices 8bB and 8bC and the first indoor unit-side connecting pipings 6B and 6C, and flows into the indoor units B and C which are about to perform heating (the indoor-side heat exchangers 5B and 5C).
  • the refrigerant which has flowed into the indoor units B and C (the indoor-side heat exchangers 5B and 5C) exchanges heat with the indoor air, is condensed and liquefied, and heat the indoors.
  • the refrigerant which has entered a liquid state passes through the flow control devices 9B and 9C in a nearly completely opened state, in which the low control devices 9B and 9C are controlled by the degree of supercooling of the outlets of the indoor-side heat exchangers 5B and 5C, and it is slightly decompressed to a pressure that is between high pressure and low pressure (an intermediate pressure).
  • the refrigerant that has been turned into an intermediate pressure passes through the second indoor unit-side connecting pipings 7B and 7C and the check valves 18B and 18C, and merges at the second junction 18A.
  • the refrigerant that has merged at the second junction 18A of the second branching unit 11 flows into the heat exchange portion 16.
  • the refrigerant that has flowed into the heat exchange portion 16 is cooled by the refrigerant flowing through the bypass piping 14, obtains a sufficient degree of supercooling, and flows out of the heat exchange portion 16.
  • a portion of the refrigerant that has flowed out of the heat exchange portion 16 flows into the second branching unit 11.
  • the refrigerant which has flowed into the second branching unit 11 passes through the first junction 17A and the second indoor unit-side connecting piping 7D, and flows into the flow control device 9D.
  • the refrigerant which has flowed into the flow control device 9D is decompressed to a predetermined low pressure based on the degree of superheat of the outlet of the indoor-side heat exchanger 5D, and flows into the indoor unit D (the indoor-side heat exchanger 5D).
  • the refrigerant which has flowed into the indoor unit D (the indoor-side heat exchanger 5D) exchanges heat with the indoor air, is evaporated and gasified, and cools the indoors.
  • the refrigerant which has entered a gaseous state passes through the first indoor unit-side connecting piping 6D, the first branching unit 10 (more specifically, the valve device 8aD), the flow control unit 31, and the first connecting piping 21, and flows into the heat source unit A.
  • the refrigerant that has flowed into the heat source unit A passes through the check valve 26 and flows into the heat source unit-side heat exchanger 3.
  • the refrigerant that has flowed into the heat source unit-side heat exchanger 3 exchanges heat with the outdoor air and evaporates into a gaseous state, and passes through the four-way switching valve 2 and is sucked into the compressor 1.
  • the remaining portion of the refrigerant that has flowed out from the heat exchange portion 16 flows into the bypass piping 14.
  • This refrigerant is decompressed to a predetermined pressure in the flow control device 15 and flows into the heat exchange portion 16.
  • the refrigerant which is decompressed in the flow control device 15 cools the refrigerant flowing through the second connecting piping 22 and evaporates, and merges with the refrigerant flowing through the first connecting piping 21.
  • the opening degree of the flow control device 15 is controlled so that the difference between the high pressure of the second connecting piping 22 and the intermediate pressure of the second branching unit 11 becomes constant.
  • valve devices 8a and the valve devices 8b connected to the indoor units B and C which are about to perform heating
  • the valve devices 8aB and 8aC are in a closed state
  • the valve devices 8bB and 8bC are in an opened state
  • the valve device 8aD is in an opened state
  • the valve device 8bD is in a closed state. Since the first connecting piping 21 is under low pressure and the second connecting piping 22 is under high pressure, the refrigerant necessarily flows to the check valve 25 and the check valve 26.
  • the flow control unit 31 is controlled as follows.
  • control is performed to close the valve device 19. If the evaporation temperature of the indoor-side heat exchanger 5D of the indoor unit D that is about to perform cooling is to be set to normal temperature or lowered, control is performed to open the valve device 19. In other words, if the valve device 19 is opened, the flow through area of the indoor-side heat exchanger 5D increases, and thus the pressure loss of the indoor-side heat exchanger 5D can be reduced. Therefore, the evaporation temperature of the indoor-side heat exchanger 5D can be set to normal temperature or lowered.
  • the valve device 19 if the valve device 19 is closed, the refrigerant flows through the capillary tube 20, and thus the pressure loss of the indoor-side heat exchanger 5D increases. Therefore, the evaporation temperature of the indoor-side heat exchanger 5D of the indoor unit D can be increased. In this way, the evaporation temperature of the indoor unit D which is about to perform cooling can be selectively changed.
  • the evaporation temperature of the heat source unit-side heat exchanger 3 changes depending on the outside air temperature.
  • the evaporation temperature of the indoor-side heat exchanger 5D that is serially connected to the heat source unit-side heat exchanger 3 drops in accordance with the drop in the evaporation temperature of the heat source unit-side heat exchanger 3 and becomes 0 degree C or less. If the evaporation temperature of the indoor-side heat exchanger 5D drops in this way, frost forms on the indoor-side heat exchanger 5D.
  • the air path of the indoor-side heat exchanger 5D becomes blocked, and the amount of air flowing into the indoor-side heat exchanger 5D decreases, leading to a decrease in cooling capacity. Further, in order to remove the frost on the indoor-side heat exchanger 5D, the cooling operation has to be temporarily suspended, and thus it becomes difficult to continue the cooling operation.
  • the evaporation temperature of the indoor-side heat exchanger 5D of the indoor unit D which is about to perform the cooling operation is detected with the temperature sensor 4D provided on the second indoor unit-side connecting piping 7D (the piping on the side at which the refrigerant flows in of the indoor-side heat exchanger 5D). If the evaporation temperature of the indoor-side heat exchanger 5D becomes a predetermined temperature (for example, 0 degree C) or less, the valve device 19 explained above is closed, and the evaporation temperature of the indoor-side heat exchanger 5D is maintained to be higher than the predetermined temperature (for example, 0 degree C). Thereby, frost formation on the indoor-side heat exchanger 5D can be prevented, and a continuous and stable cooling operation can be maintained.
  • a predetermined temperature for example, 0 degree C
  • the evaporation temperature of the indoor-side heat exchanger 5D may also be detected by the temperature sensor 28. By maintaining this detected temperature to be higher than the predetermined temperature (for example, 0 degree C), the evaporation temperature of the indoor-side heat exchanger 5D which is upstream thereof becomes higher by the amount of pressure loss. Therefore, frost formation on the indoor-side heat exchanger 5D can be prevented.
  • the predetermined temperature for example, 0 degree C
  • the sensible heat ratio of the indoor unit D (the indoor-side heat exchanger 5D) can be increased, similar to during the cooling only operation. Therefore, when the indoor unit D is installed in a place in which the sensible heat load is large such as a computer room, it is possible to select an indoor unit D having a small cooling capacity, that is, an indoor unit D having a small product form. Therefore, it is possible to reduce cost.
  • the predetermined temperature described above which is a threshold value for determining the opening/closing of the valve device 19, may of course be a value other than 0 degree C.
  • the predetermined temperature can be set a number of degrees C higher (for example, 3 degrees C).
  • Fig. 4 is a diagram of the operation state during cooling main operation in the air-conditioning apparatus according to Embodiment 1 of the present invention.
  • the solid arrows in Fig. 4 show the flow of the refrigerant during the cooling main operation.
  • Fig. 3 shows a case in which the indoor units B and C are in cooling operation, and the indoor unit D is in heating operation.
  • a high-temperature, high-pressure gas refrigerant that is discharged from the compressor 1 passes through the four-way switching valve 2, exchanges an arbitrary amount of heat in the heat source unit-side heat exchanger 3 to become a high-temperature high-pressure two-phase gas-liquid refrigerant.
  • This refrigerant passes through the check valve 23 and the second connecting piping 22, and flows into the relay unit E.
  • the refrigerant that has flowed into the relay unit E flows into the gas-liquid separating device 12, and is separated into a gas refrigerant and a liquid refrigerant.
  • the gas refrigerant that has been separated in the gas-liquid separating device 12 passes through the valve device 8bD of the first branching unit 10 and the first indoor unit-side connecting piping 6D in that order, and flows into the indoor unit D which is about to perform heating.
  • the refrigerant which has flowed into the indoor unit D (the indoor-side heat exchanger 5D) exchanges heat with the indoor air, is condensed and liquefied, and heats the indoors.
  • the refrigerant which has entered a liquid state passes through the flow control device 9D which is controlled to be in a nearly completely opened state by the degree of supercooling of the outlet of the indoor-side heat exchanger 5D, and it is slightly decompressed to an intermediate pressure.
  • the refrigerant which has been turned into an intermediate pressure passes through the second indoor unit-side connecting piping 7D, the check valve 18D, and the second junction 18A, and merges with the liquid refrigerant flowing through the second connecting piping 22 (the liquid refrigerant that was separated in the gas-liquid separating device 12).
  • the liquid refrigerant that has been separated in the gas-liquid separating device 12 of the relay unit E flows into the heat exchange portion 16.
  • the refrigerant that has flowed into the heat exchange portion 16 is cooled by the refrigerant flowing through the bypass piping 14, obtains a sufficient degree of supercooling, and flows into the flow control device 13 to be decompressed to a predetermined pressure.
  • the opening degree of the flow control device 13 is controlled so that the difference between the high pressure of the second connecting piping 22 that is on the upstream side of the flow control device 13 and the intermediate pressure of the second branching unit 11 becomes constant.
  • a portion of the refrigerant that has flowed out of the flow control device 13 passes through the first junction 17A of the second branching unit 11 and the second indoor unit-side connecting pipings 7B and 7C, and flows into the flow control devices 9B and 9C.
  • the refrigerant which has flowed into the flow control devices 9B and 9C is decompressed to a predetermined low pressure based on the degree of superheat of the outlets of the indoor-side heat exchangers 5B and 5C, and flows into the indoor units B and C (the indoor-side heat exchangers 5B and 5C).
  • the refrigerant which has flowed into the indoor units B and C exchanges heat with the indoor air, is evaporated and is gasified, and cools the indoors.
  • the refrigerant which has entered a gaseous state passes through the first indoor unit-side connecting pipings 6B and 6C, the first branching unit 10 (more specifically, the valve devices 8aB and 8aC), the flow control unit 31, and the first connecting piping 21, and flows into the heat source unit A.
  • the refrigerant that has flowed into the heat source unit A passes through the check valve 24 and the four-way switching valve 2 and is sucked into the compressor 1.
  • the remaining portion of the refrigerant that has flowed out of the flow control device 13 flows into the bypass piping 14.
  • This refrigerant is decompressed to a low pressure in the flow control device 15 and flows into the heat exchange portion 16.
  • the refrigerant that is decompressed in the flow control device 15 cools the refrigerant flowing through the second connecting piping 22, and evaporates and merges with the refrigerant flowing through the first connecting piping 21.
  • valve devices 8a and the valve devices 8b connected to the indoor units B and C which are about to perform cooling the valve devices 8aB and 8aC are in an opened state, and the valve devices 8bB and 8bC are in a closed state.
  • the valve device 8aD is in a closed state and the valve device 8bD is in an opened state. Since the first connecting piping 21 is under low pressure and the second connecting piping 22 is under high pressure, the refrigerant necessarily flows to the check valve 23 and the check valve 24.
  • the flow control unit 31 is controlled as follows.
  • control is performed to close the valve device 19. If the evaporation temperature of the indoor-side heat exchangers 5B and 5C of the indoor units B and C that are about to perform cooling is to be set to normal temperature or lowered, control is performed to open the valve device 19. In other words, if the valve device 19 is opened, the flow through area of the indoor-side heat exchangers 5B and 5C increases, and thus the pressure loss of the indoor-side heat exchangers 5B and 5C can be reduced.
  • the evaporation temperature of the indoor-side heat exchangers 5B and 5C can be set to normal temperature or lowered.
  • the valve device 19 if the valve device 19 is closed, the refrigerant flows through the capillary tube 20, and thus the pressure loss of the indoor-side heat exchangers 5B and 5C increases. Therefore, the evaporation temperature of the indoor-side heat exchangers 5B and 5C can be increased. In this way, the evaporation temperature of the indoor-side heat exchangers 5B and 5C of the indoor units B and C that are about to perform cooling can be selectively changed.
  • the sensible heat ratio of the indoor units B and C (the indoor-side heat exchangers 5B and 5C) can be increased, similar to during the cooling only operation. Therefore, when the indoor units B and C are installed in a place in which the sensible heat load is large such as a computer room, it is possible to select indoor units B and C having a small cooling capacity, that is, indoor units B and C having a small product form. Therefore, it is possible to reduce cost.
  • the flow control unit 31 is not limited to the constitution shown in Embodiment 1.
  • the flow control unit 31 can also be constituted as described below.
  • items that are not particularly described are the same as in Embodiment 1.
  • Fig. 5 is a diagram of a refrigerant circuit showing the air-conditioning apparatus according to Embodiment 2 of the present invention.
  • the flow control unit 31 of an air-conditioning apparatus 101 according to Embodiment 2 includes a flow control device 27 whose opening degree can be changed.
  • the other constitutions are the same as those shown in the air-conditioning apparatus 100 according to Embodiment 1.
  • the operation and the like the flow of a refrigerant and the like
  • the operation and the like are also the same as shown in the air-conditioning apparatus 100 according to Embodiment 1.
  • the flow control unit 31 is controlled as follows.
  • control is performed to decrease the opening degree of the flow control device 27. If the evaporation temperature of the indoor-side heat exchangers 5B, 5C, and 5D of the indoor units B, C, and D that are about to perform cool is to be set to normal temperature or lowered, control is performed to increase the opening degree of the flow control device 27.
  • the opening degree of the flow control device 27 As the opening degree of the flow control device 27 is increased, the flow through area of the indoor-side heat exchangers 5B, 5C, and 5D increases, and thus the pressure loss of the indoor-side heat exchangers 5B, 5C, and 5D can be reduced. Therefore, the evaporation temperature of the indoor-side heat exchangers 5B, 5C, and 5D can be set to normal temperature or lowered.
  • the opening degree of the flow control device 27 is decreased, the pressure loss of the indoor-side heat exchangers 5B, 5C, and 5D increases. Therefore, the evaporation temperature of the indoor-side heat exchangers 5B, 5C, and 5D can be increased.
  • the evaporation temperature of the indoor-side heat exchangers 5B, 5C, and 5D can be selectively changed. Further, by using the flow control device 27 whose opening degree can be changed, the evaporation temperature of the indoor-side heat exchangers 5B, 5C, and 5D can be arbitrarily (linearly) controlled.
  • the sensible heat ratio of the indoor units B, C, and D (the indoor-side heat exchangers 5B, 5C, and 5D) can be increased. Therefore, when the indoor units B, C, and D are installed in a place in which the sensible heat load is large such as a computer room, it is possible to select indoor units B, C, and D having a small cooling capacity, that is, indoor units B, C, and D having a small product form. Therefore, it is possible to reduce cost.
  • the flow control unit 31 includes a flow control device 27 whose opening degree can be changed, the evaporation temperature and the sensible heat ratio of the indoor-side heat exchangers 5B, 5C, and 5D can be arbitrarily (for example, linearly) controlled.

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Claims (5)

  1. Appareil de climatisation (100, 101), comprenant :
    une unité source de chaleur (A) qui présente un compresseur (1), une soupape de commutation à quatre voies (2), et un échangeur de chaleur du côté unité source de chaleur (3) qui est connecté à la soupape de commutation à quatre voies (2) ;
    une pluralité d'unités intérieures (B, C, et D), chacune d'elles présentant un échangeur de chaleur du côté intérieur (5), et un premier dispositif de commande de flux (9) connecté à une extrémité de l'échangeur de chaleur du côté intérieur (5) ; et
    une unité relais (E) qui connecte l'unité source de chaleur (A) aux unités intérieures (B, C, et D) ;
    l'appareil de climatisation étant capable de réaliser une opération simultanée de chauffage et de refroidissement dans laquelle chacune des unités intérieures (B, C, et D) exécute de manière sélective une opération de refroidissement ou une opération de chauffage, dans lequel :
    l'unité relais (E) est connectée à l'unité source de chaleur (A) par une première canalisation de connexion (21) à travers laquelle circule un fluide frigorigène qui s'écoule vers l'unité source de chaleur (A) et une seconde canalisation de connexion (22) à travers laquelle circule le fluide frigorigène qui s'écoule en provenance de l'unité source de chaleur (A) ; et
    l'unité relais (E) comprend :
    une première unité ramification (10) qui connecte d'une manière qui peut être commutée, l'autre extrémité de chaque échangeur de chaleur du côté intérieur (5), à la première canalisation de connexion (21) ou à la seconde canalisation de connexion (22) ;
    une seconde unité ramification (11) qui connecte d'une manière qui peut être commutée, chaque premier dispositif de commande de flux (9) à la première canalisation de connexion (21) ou à la seconde canalisation de connexion (22) ; et
    une unité commande de flux (31) disposée dans la première canalisation de connexion (21) qui commande la quantité d'écoulement de fluide frigorigène qui circule à travers les échangeurs de chaleur du côté intérieur (5) qui fonctionnent en tant qu'évaporateur, caractérisé en ce que l'appareil de climatisation (100, 101) comprend en outre un dispositif de détection de la température (28) qui détecte la température du fluide frigorigène, et qui est disposé dans la première canalisation de connexion (21) entre la première unité ramification (10) et l'unité commande de flux (31) ; et
    la quantité d'écoulement du fluide frigorigène qui circule à travers les échangeurs de chaleur du côté intérieur (5) qui fonctionnent en tant qu'évaporateur, est commandée sur la base de la température détectée par le dispositif de détection de la température (28).
  2. Appareil de climatisation (100) selon la revendication 1, dans lequel :
    l'unité commande de flux (31) comprend un dispositif à soupape qui peut être ouvert et fermé (19), et un tube capillaire (20) connecté en parallèle au dispositif à soupape (19) ; et
    la quantité d'écoulement du fluide frigorigène qui circule à travers les échangeurs de chaleur du côté intérieur (5) qui fonctionnent en tant qu'évaporateur, est commandée par l'ouverture et par la fermeture du dispositif à soupape (19).
  3. Appareil de climatisation (101) selon la revendication 1, dans lequel :
    l'unité commande de flux (31) comprend un second dispositif de commande de flux (27) dont il est possible de modifier le degré d'ouverture ; et
    la quantité d'écoulement du fluide frigorigène qui circule à travers les échangeurs de chaleur du côté intérieur (5) qui fonctionnent en tant qu'évaporateur, est commandée en commandant le degré d'ouverture du second dispositif de commande de flux (27).
  4. Appareil de climatisation (100) selon l'une quelconque des revendications 1 à 3, dans lequel, lorsque l'échangeur de chaleur du côté unité source de chaleur (3) fonctionne en tant qu'évaporateur, les échangeurs de chaleur du côté intérieur (5) fonctionnant en tant qu'évaporateur, l'unité commande de flux (31), et l'unité source de chaleur (A), sont connectés en série.
  5. Appareil de climatisation (100) selon l'une quelconque des revendications 1 à 4, dans lequel l'unité commande de flux (31) règle la quantité d'écoulement de fluide frigorigène qui circule à travers les échangeurs de chaleur du côté intérieur (5) qui fonctionnent en tant qu'évaporateur, sur la base de la température d'évaporation du fluide frigorigène qui circule à travers les échangeurs de chaleur du côté intérieur (5) qui fonctionnent en tant qu'évaporateur.
EP09852226.1A 2009-12-15 2009-12-15 Climatiseur Not-in-force EP2515055B1 (fr)

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EP2515055A4 (fr) 2016-10-26
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JPWO2011074028A1 (ja) 2013-04-25
WO2011074028A1 (fr) 2011-06-23
US20120285675A1 (en) 2012-11-15

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