WO2019146502A1 - Air conditioning device - Google Patents

Air conditioning device Download PDF

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Publication number
WO2019146502A1
WO2019146502A1 PCT/JP2019/001336 JP2019001336W WO2019146502A1 WO 2019146502 A1 WO2019146502 A1 WO 2019146502A1 JP 2019001336 W JP2019001336 W JP 2019001336W WO 2019146502 A1 WO2019146502 A1 WO 2019146502A1
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WO
WIPO (PCT)
Prior art keywords
heat exchanger
indoor
radiation
circuit
refrigerant
Prior art date
Application number
PCT/JP2019/001336
Other languages
French (fr)
Japanese (ja)
Inventor
宏 海老名
長谷川　隆
聡通 仲山
Original Assignee
ダイキン工業株式会社
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Filing date
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Application filed by ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Publication of WO2019146502A1 publication Critical patent/WO2019146502A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/009—Indoor units, e.g. fan coil units characterised by heating arrangements
    • F24F1/0093—Indoor units, e.g. fan coil units characterised by heating arrangements with additional radiant heat-discharging elements, e.g. electric heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • 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
    • F25B1/00—Compression machines, plants or systems with non-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
    • 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • 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
    • F25B6/00—Compression machines, plants or systems, with several condenser circuits
    • F25B6/02—Compression machines, plants or systems, with several condenser circuits arranged in parallel

Definitions

  • the present disclosure relates to an air conditioner.
  • Patent Document 1 discloses an air conditioner provided with a radiation type indoor unit and a convection type indoor unit.
  • the radiation type indoor unit and the convection type indoor unit are connected in series to the refrigerant circuit.
  • the refrigerant dissipates heat and condenses in the heating element of the radiation type indoor unit.
  • the refrigerant further dissipates heat and condenses in the convection side indoor unit.
  • An object of the present disclosure is to provide an air conditioner that can individually control the flow rate of the refrigerant flowing through the indoor heat exchanger and the flow rate of the refrigerant flowing through the radiant heat exchanger.
  • An air conditioner comprising a refrigerant circuit (11) including an indoor circuit (13) and a radiation circuit (15) to which the radiant heat exchanger (52) and the second control valve (51) are connected, In the refrigerant circuit (11), the indoor circuit (13) and the radiation circuit (15) are connected in parallel.
  • the refrigerant is diverted to the indoor circuit (13) and the radiation circuit (15).
  • the flow rates of the refrigerant flowing through the indoor heat exchanger (31) and the flow rates of the refrigerant flowing through the radiant heat exchanger (52) are controlled by controlling the opening degree of the first control valve (32) and the second control valve (51) respectively. And can be adjusted individually.
  • a 2nd aspect is a 1st aspect
  • the said outdoor circuit (12) is provided in the outdoor unit (20)
  • the said indoor circuit (13) is provided in the indoor unit (30)
  • the said radiation circuit ( 15) is an air conditioner characterized in that the radiation panel (40) is provided.
  • the capacity of the indoor unit (30) and the capacity of the radiation panel (40) are individually controlled by controlling the opening degree of the first control valve (32) and the second control valve (51) respectively. Can be controlled.
  • the refrigerant circuit (11) branches from a gas communication pipe (16) connected to the outdoor heat exchanger (22), and the gas communication pipe (16) And a gas pipe (54) connected to the radiant heat exchanger (52), wherein the inside diameter of the gas pipe (54) is smaller than the inside diameter of the gas communication pipe (16) It is a harmony device.
  • the flow velocity of the refrigerant flowing through the gas pipe (54) can be suppressed from becoming too small.
  • the refrigerant circuit (11) comprises at least one of the indoor heat exchanger (31) and at least one of the radiant heat exchanger (52).
  • the air conditioner is characterized in that it is configured to perform a refrigeration cycle in which the heat sink becomes a radiator.
  • the heating capacity of the indoor heat exchanger (31) and the heating capacity of the radiant heat exchanger (52) can be individually controlled.
  • the refrigerant circuit (11) includes at least one of the indoor heat exchanger (31) and at least one of the radiant heat exchanger (52).
  • the air conditioner is characterized in that it is configured to perform a refrigeration cycle in which the one and the other become an evaporator.
  • the cooling capacity of the indoor heat exchanger (31) and the cooling capacity of the radiant heat exchanger (52) can be controlled separately.
  • one of the indoor heat exchanger (31) and the radiant heat exchanger (52) is a radiator. It is an air conditioner characterized in that it is configured to perform a refrigeration cycle in which the other is an evaporator.
  • the refrigerant on the outflow side of the radiant heat exchanger (52) has an excess during the refrigeration cycle in which the radiant heat exchanger (52) is a radiator.
  • a control unit (C2) for controlling the degree of opening of the second control valve (51) such that the degree of cooling reaches a predetermined value is an air conditioner characterized in that
  • the degree of supercooling of the opening degree of the second control valve (51) is controlled during the refrigeration cycle in which the heating operation is performed by the radiant heat exchanger (52).
  • the superheat degree of the refrigerant on the outflow side of the radiant heat exchanger (52) during the operation in which the radiant heat exchanger (52) becomes an evaporator is provided.
  • a control unit (C2) is provided to control the opening degree of the second control valve (51) so that the value of d becomes a predetermined value.
  • the degree of superheat control of the opening degree of the first control valve (32) is performed during the refrigeration cycle in which the cooling operation is performed by the radiant heat exchanger (52).
  • a ninth aspect is the air conditioning apparatus according to any one of the second to eighth aspects, wherein the rated cooling capacity of the entire air conditioning apparatus is 7.1 kW or more.
  • the total of the rated capacities of the indoor unit (30) and the radiation panel (40) is in the range of 50% to 200% of the rated capacity of the outdoor unit (20). It is an air conditioner characterized by things.
  • the cooling operation is performed only with the radiant heat exchanger (52) among the indoor heat exchanger (31) and the radiant heat exchanger (52).
  • An air conditioning apparatus characterized by performing a cooling operation to be performed.
  • the twelfth aspect is the heating according to any one of the first to eleventh, wherein the heating operation is performed only with the radiant heat exchanger (52) among the indoor heat exchanger (31) and the radiant heat exchanger (52). It is an air conditioner characterized by performing operation.
  • FIG. 1 is a piping system diagram showing a schematic configuration of the air conditioning apparatus according to the first embodiment.
  • FIG. 2 is a front view showing a schematic configuration of the radiation panel according to the first embodiment.
  • FIG. 3 is a schematic block diagram of the air conditioning apparatus according to the first embodiment.
  • FIG. 4 is a piping system diagram showing a schematic configuration of the air conditioning apparatus according to the second embodiment.
  • FIG. 5 is a piping system diagram showing a schematic configuration of the air conditioning apparatus according to Embodiment 2, to which the flow of the refrigerant in the cooling operation is applied.
  • FIG. 6 is a piping system diagram showing a schematic configuration of the air conditioning apparatus according to Embodiment 2, to which a flow of refrigerant for heating operation is applied.
  • FIG. 1 is a piping system diagram showing a schematic configuration of the air conditioning apparatus according to the first embodiment.
  • FIG. 2 is a front view showing a schematic configuration of the radiation panel according to the first embodiment.
  • FIG. 3 is a schematic
  • FIG. 7 is a piping system diagram showing a schematic configuration of the air conditioning apparatus according to Embodiment 2, to which the flow of the refrigerant in the first simultaneous heating and cooling operation is given.
  • FIG. 8 is a piping diagram showing a schematic configuration of the air conditioning apparatus according to Embodiment 2, to which the flow of the refrigerant in the second simultaneous heating and cooling operation is given.
  • FIG. 9 is a piping diagram showing a schematic configuration of the air conditioning apparatus according to the third embodiment.
  • Embodiment 1 An air conditioner (10) of the first embodiment will be described with reference to the drawings.
  • the air conditioner (10) switches between cooling and heating of the room.
  • the air conditioner (10) includes an outdoor unit (20), an indoor unit (30), and a radiation panel (40).
  • the outdoor unit (20) is installed outdoors.
  • the outdoor unit (20) constitutes a heat source unit.
  • the outdoor unit (20) is provided with a compressor (21), an outdoor heat exchanger (22), an outdoor expansion valve (23), a four-way switching valve (24), and an outdoor fan (25).
  • the indoor unit (30) is provided near the ceiling of the room.
  • the indoor unit (30) constitutes a convection type indoor unit that performs cooling or heating by the air conveyed by the indoor fan (33).
  • the number of indoor units (30) is one or more.
  • Each indoor unit (30) is provided with an indoor heat exchanger (31), an indoor expansion valve (32), and an indoor fan (33).
  • the radiation panel (40) is installed on the floor of the room.
  • the radiation panel (40) constitutes a radiation type indoor unit that performs cooling or heating by the movement of radiant heat.
  • the number of radiation panels (40) is one or more.
  • the air conditioner (10) is configured with a refrigerant circuit (11) in which the filled refrigerant circulates. Details of the refrigerant circuit (11) will be described later.
  • the radiation panel (40) includes a pair of support columns (41), a panel body (52) (also referred to as a radiation heat exchanger (52)), and a bottom plate (42).
  • the columns (41) are provided one each at the left and right ends of the radiation panel (40).
  • Each support post (41) is erected on the floor surface and extends in the vertical direction.
  • the panel body (52) is provided between the pair of columns (41). The front and back surfaces of the panel body (52) are exposed to the indoor space.
  • the bottom plate (42) extends laterally between the pair of columns (41) so as to be connected to the lower ends of the pair of columns (41).
  • the bottom plate (42) is fixed to the floor of the room via a fastening member (not shown) such as an anchor bolt.
  • the upper ends of the pair of columns (41) are connected to a ceiling side suspension bolt (not shown) via a fixing portion (43).
  • a lower accommodation room (44) is formed below the panel body (52).
  • the lower accommodation chamber (44) is provided with a drain pan (45) for recovering the dew condensation water generated from the panel body (52).
  • the open front and rear sides of the lower accommodation chamber (44) are covered by the lower cover (46), respectively.
  • Each lower cover (46) is removably attached, for example, to the lower part of a pair of support posts (41).
  • an upper storage chamber (47) is formed on the upper side of the panel body (52).
  • a liquid pipe (53) and a gas pipe (54) of the refrigerant pipe are accommodated in the upper accommodation chamber (47).
  • a radiation expansion valve (50) (not shown in FIG. 2) is connected to the liquid pipe (53).
  • the open front and rear sides of the upper accommodation chamber (47) are covered by the upper cover (48), respectively.
  • Each upper cover (48) is removably attached, for example, to the top of a pair of support posts (41).
  • the refrigerant circuit (11) includes an outdoor circuit (12), an indoor circuit (13), and a radiation circuit (15).
  • the outdoor circuit (12) is provided in the outdoor unit (20)
  • the indoor circuit (13) is provided in the indoor unit (30)
  • the radiation circuit (15) is provided in the radiation panel (40).
  • the indoor unit (30) and the radiation panel (40) are connected to the outdoor unit (20) via the two connection pipes (16, 17).
  • the indoor circuit (13) and the radiation circuit (15) are connected to the outdoor circuit (12) via a gas communication pipe (16) and a liquid communication pipe (17) as communication pipes.
  • a compressor (21), an outdoor heat exchanger (22), an outdoor expansion valve (23), and a four-way switching valve (24) are connected to the outdoor circuit (12).
  • the compressor (21) is configured as a variable displacement type. More specifically, the amount of refrigerant circulation in the refrigerant circuit (11) can be adjusted by controlling the operating frequency of the compressor (21) by the inverter device.
  • an outdoor fan (25) for conveying outdoor air is provided in the vicinity of the outdoor heat exchanger (22).
  • the outdoor expansion valve (23) is a flow control valve having a variable opening degree, and is formed of, for example, an electronic expansion valve.
  • the four-way switching valve (24) constitutes a switching mechanism for switching between the heating operation and the cooling operation.
  • the four-way switching valve (24) is configured to be switchable between a first state (a state shown by a solid line in FIG. 1) and a second state (a state shown by a broken line in FIG. 1).
  • the four-way switching valve (24) switches to the first state in the cooling operation.
  • the four-way switching valve (24) in the first state communicates the discharge side of the compressor (21) with the gas end of the outdoor heat exchanger (22), and at the same time, makes gas communication with the suction side of the compressor (21). Bring the pipe (16) into communication.
  • the four-way switching valve (24) switches to the second state in the heating operation.
  • the four-way switching valve (24) in the second state brings the discharge side of the compressor (21) into communication with the gas communication pipe (16), and at the same time the suction side of the compressor (21) and the outdoor heat exchanger (22) Communicate with the end of the gas.
  • the outdoor circuit (12) is provided with a discharge pressure sensor (61) and a suction pressure sensor (62).
  • the discharge pressure sensor (61) is provided on the discharge side of the compressor (21).
  • the discharge pressure sensor (61) detects the pressure (the high pressure pressure of the refrigerant circuit (11)) of the refrigerant discharged from the compressor (21).
  • the suction pressure sensor (62) detects the pressure of the suction refrigerant of the compressor (21) (the low pressure of the refrigerant circuit (11)).
  • the number of indoor circuits (13) corresponds to the number of indoor units (30).
  • One end (liquid end) of the indoor circuit (13) is connected to the liquid communication pipe (17).
  • the other end (gas end) of the indoor circuit (13) is connected to a gas communication pipe (16).
  • the indoor expansion valve (32) and the indoor heat exchanger (31) are connected to the indoor circuit (13) in order from the liquid end to the gas end.
  • the indoor expansion valve (32) is a flow control valve (first control valve) having a variable opening degree, and is formed of, for example, an electronic expansion valve.
  • an indoor fan (33) for conveying indoor air is provided in the vicinity of the indoor heat exchanger (31).
  • the refrigerant flowing inside thereof exchanges heat with the indoor air conveyed by the indoor fan (33).
  • the indoor circuit (13) is provided with a first liquid side temperature sensor (63) and a first gas side temperature sensor (64).
  • the first liquid side temperature sensor (63) is provided on the liquid side of the indoor heat exchanger (31), and detects the temperature of the liquid refrigerant flowing through the indoor circuit (13).
  • the first gas side temperature sensor (64) is provided on the gas side of the indoor heat exchanger (31) and detects the temperature of the gas refrigerant flowing through the indoor circuit (13).
  • the number of radiation circuits (15) corresponds to the number of radiation panels (40).
  • One end (liquid end) of the radiation circuit (15) is connected to the liquid communication pipe (17).
  • the other end (gas end) of the radiation circuit (15) is connected to a gas communication pipe (16).
  • a radiation expansion valve (51) and a radiation heat exchanger (52) are connected to the radiation circuit (15) in order from the liquid end to the gas end.
  • the radiation expansion valve (51) is a flow control valve (second control valve) having a variable opening degree, and is formed of, for example, an electronic expansion valve.
  • a fan for conveying air is not provided. That is, the radiant heat exchanger (52) exchanges heat between the refrigerant and the indoor air by the transfer of radiant heat.
  • the radiation circuit (15) is provided with a second liquid side temperature sensor (65) and a second gas side temperature sensor (66).
  • the second liquid side temperature sensor (65) is provided on the liquid side (liquid pipe (53)) of the radiant heat exchanger (52), and detects the temperature of the liquid refrigerant flowing through the radiation circuit (15).
  • the second gas side temperature sensor (66) is provided on the gas side (gas pipe (54)) of the radiant heat exchanger (52), and detects the temperature of the gas refrigerant flowing through the radiation circuit (15).
  • the gas pipe (54) branches from the gas communication pipe (16).
  • the inner diameter of the gas pipe (54) of the present embodiment is smaller than the inner diameter of the gas communication pipe (16).
  • the gas pipe (54) is constituted by a so-called three-minute pipe (a pipe having a 3/8 inch diameter), and the gas connection pipe (16) is a so-called four-minute pipe (a piping having a 4/8 inch diameter) It consists of For this reason, the gas communication pipe (16) and the gas pipe (54) are connected to each other via a different diameter joint (not shown).
  • the air conditioner (10) is provided with a remote controller (70) for operating the air conditioner (10).
  • the remote controller (70) is provided with a display unit such as a liquid crystal monitor, operation buttons, and the like.
  • the remote control (70) can set the indoor set temperature Ts.
  • the remote controller (70) of the present embodiment is provided with an indoor temperature sensor (71) for detecting the indoor temperature Tr.
  • the remote controller (70) is preferably arranged in the vicinity of the radiation panel (40). In the example of FIG. 3, the remote controller (70) is disposed closer to the radiation panel (40) than the other indoor units (30).
  • the indoor unit (30) of the present embodiment is provided with an indoor controller (34), and the radiation panel (40) is provided with a radiation controller (55) (control unit).
  • a radiation controller 55) (control unit).
  • Each of the indoor controller (C1) and the radiation controller (C2) is configured by using a microcomputer and a memory device (specifically, a semiconductor memory) storing software for operating the microcomputer. .
  • the indoor controller (C1) and the radiation controller (C2) can input and output detection signals of various sensors, control signals, and the like.
  • the indoor controller (C1) controls the start / stop (so-called thermo on / thermo off) of the indoor unit (30). More specifically, the indoor controller (C1) stops (thermo-off) the indoor unit (30) when the temperature Tr of the indoor air reaches a predetermined value based on the set temperature Ts.
  • the indoor controller (C1) controls the opening degree of the indoor expansion valve (32) in a so-called superheat degree in the cooling operation. Specifically, in the cooling operation, the opening degree of the indoor expansion valve (32) is adjusted such that the degree of superheat SH1 of the refrigerant after evaporation in the indoor heat exchanger (31) approaches the target degree of superheat.
  • the degree of superheat SH1 is determined, for example, by the difference between the temperature of the refrigerant detected by the first gas side temperature sensor (64) and the saturation temperature corresponding to the low pressure detected by the suction pressure sensor (62).
  • the indoor controller (C1) controls the degree of opening of the indoor expansion valve (32) in so-called supercooling in the heating operation. Specifically, in the heating operation, the degree of opening of the indoor expansion valve (32) is adjusted such that the degree of subcooling SC1 of the refrigerant after condensation in the indoor heat exchanger (31) approaches the target degree of subcooling .
  • the degree of subcooling SC1 is determined, for example, by the difference between the temperature of the refrigerant detected by the first liquid side temperature sensor (63) and the saturation temperature corresponding to the high pressure detected by the discharge pressure sensor (61).
  • the radiation controller (C2) controls the radiation expansion valve (51) to control start / stop of the radiation panel (40) (so-called thermo on / thermo off).
  • the radiation controller (C2) of the present embodiment performs so-called group control in which thermo-on / thermo-off is switched in conjunction with a previously set indoor unit (30). Details of this control will be described later.
  • the radiation controller (C2) controls the opening degree of the radiation expansion valve (51) in a so-called superheat degree in the cooling operation. Specifically, in the heating operation, the opening degree of the radiation expansion valve (51) is adjusted so that the degree of superheat SH2 of the refrigerant after evaporation in the radiant heat exchanger (52) approaches the target degree of superheat.
  • the degree of superheat SH2 is determined, for example, by the difference between the temperature of the refrigerant detected by the second gas side temperature sensor (66) and the saturation temperature corresponding to the low pressure detected by the suction pressure sensor (61).
  • the radiation controller (C2) controls the degree of opening of the radiation expansion valve (51) in so-called supercooling in the heating operation. Specifically, in the heating operation, the degree of opening of the radiation expansion valve (51) is adjusted such that the degree of subcooling SC2 of the refrigerant after condensation in the radiant heat exchanger (52) approaches the target degree of subcooling.
  • the degree of subcooling SC2 is determined, for example, by the difference between the temperature of the refrigerant detected by the second liquid side temperature sensor (65) and the saturation temperature corresponding to the high pressure detected by the discharge pressure sensor (61).
  • the operation of the air conditioner (10) according to the first embodiment will be described with reference to FIG.
  • the air conditioner (10) switches between cooling operation and heating operation.
  • ⁇ Cooling operation> In the cooling operation, the compressor (21), the outdoor fan (25), and the indoor fan (33) are operated.
  • the four-way switching valve (24) is in the first state.
  • the outdoor expansion valve (23) is opened at a predetermined opening (for example, fully open).
  • the degree of superheat of the opening degree of the indoor expansion valve (32) and the radiation expansion valve (51) is controlled.
  • a refrigeration cycle is performed in which the refrigerant condensed and radiated by the outdoor heat exchanger (22) is evaporated by the indoor heat exchanger (31) and the radiant heat exchanger (52).
  • the refrigerant compressed by the compressor (21) flows through the outdoor heat exchanger (22).
  • the refrigerant releases heat to the outdoor air and condenses.
  • the refrigerant condensed by the outdoor heat exchanger (22) passes through the outdoor expansion valve (23) and then flows through the liquid communication pipe (17).
  • the refrigerant flowing through the liquid communication pipe (17) is branched into the indoor circuit (13) and the radiation circuit (15).
  • the refrigerant flowing into the indoor circuit (13) flows through the indoor heat exchanger (31) after being depressurized by the indoor expansion valve (32).
  • the indoor heat exchanger (31) the refrigerant absorbs heat from the air conveyed by the indoor fan (33) and evaporates.
  • the refrigerant evaporated in the indoor heat exchanger (31) flows out to the gas connection pipe (16).
  • the refrigerant flowing into the radiation circuit (15) is reduced in pressure by the radiation expansion valve (51) and then flows through the radiation heat exchanger (52).
  • the radiation heat exchanger (52) the refrigerant absorbs heat from room air around the radiation panel (40) and evaporates.
  • the refrigerant evaporated in the radiant heat exchanger (52) flows out to the gas connection pipe (16).
  • the refrigerant merged in the gas communication pipe (16) is sucked into the compressor (21) and compressed again.
  • ⁇ Heating operation> In the heating operation, the compressor (21), the outdoor fan (25), and the indoor fan (33) are operated. The four-way switching valve (24) is in the second state. The outdoor expansion valve (23) is superheated controlled. The degree of opening of the indoor expansion valve (32) and the radiation panel (40) is subcooled. In the heating operation, a refrigeration cycle is performed in which the refrigerant condensed and radiated by the indoor heat exchanger (31) and the radiant heat exchanger (52) is evaporated by the outdoor heat exchanger (22).
  • the refrigerant compressed by the compressor (21) flows through the gas connection pipe (16) and is branched into the outdoor circuit (12) and the radiation circuit (15).
  • the refrigerant flowing into the indoor circuit (13) flows through the indoor heat exchanger (31).
  • the refrigerant releases heat to the air conveyed by the indoor fan (33) and condenses.
  • the refrigerant condensed by the indoor heat exchanger (31) passes through the indoor expansion valve (32) and then flows out to the liquid communication pipe (17).
  • the refrigerant releases heat to room air around the radiation panel (40) and condenses.
  • the refrigerant condensed by the radiant heat exchanger (52) flows out to the liquid communication pipe (17) after passing through the radiant expansion valve (51).
  • the refrigerant joined in the liquid communication pipe (17) flows into the outdoor circuit (12), is decompressed by the outdoor expansion valve (23), and then flows through the outdoor heat exchanger (22).
  • the outdoor heat exchanger (22) the refrigerant absorbs heat from the outdoor air and evaporates.
  • the refrigerant evaporated in the outdoor heat exchanger (22) is sucked into the compressor (21) and compressed again.
  • Group control In the cooling operation and the heating operation described above, group control is performed in which switching of the heat on / heat off of the radiation panel (40) is performed in conjunction with a predetermined indoor unit (30). This group control will be described with reference to FIG.
  • the second indoor unit (30B) and the radiation panel (40) are set in the same group. For this reason, the radiation panel (40) is switched between thermo on / thermo off so as to interlock with the second indoor unit (30B). On the other hand, in the second indoor unit (30B), the thermo on / thermo off is switched based on the indoor temperature Tr detected by the indoor temperature sensor (71) of the remote controller (70).
  • the indoor temperature Tr detected by the indoor temperature sensor (71) is appropriately input to the indoor controller (C1) of the second indoor unit (30B). For example, it is assumed that the room temperature Tr reaches a predetermined value in the heating operation. In this case, the indoor controller (C1) turns off the second indoor unit (30B). Along with this, for example, the indoor controller (C1) of the second indoor unit (30B) outputs a control signal to the radiation controller (C2). This control signal is a control signal for thermo-off of the radiation panel (40). Therefore, the radiation controller (C2) that received this control signal causes the radiation panel (40) to heat off. As a result, the radiation panel (40) performs the thermo-off at a timing substantially the same as or slightly delayed from the thermo-off of the second indoor unit (30B).
  • the second indoor unit (30B) is again turned on.
  • a control signal is output from the indoor controller (C1) of the second indoor unit (30B) to the radiation controller (C2).
  • This control signal is a control signal for causing the radiation panel (40) to heat on. Therefore, the radiation controller (C2) receiving this control signal causes the radiation panel (40) to heat on.
  • the radiation panel (40) performs thermo-on substantially at the same time as or slightly later than the thermo-on of the second indoor unit (30B).
  • the remote controller (70) (strictly, the indoor temperature sensor (71)) is disposed closer to the radiation panel (40) than the second indoor unit (30B). Therefore, for example, in the heating operation, it is possible to reliably warm the air around the radiation panel (40) while suppressing the frequency of start / stop of the radiation panel (40). This point will be described in detail.
  • the remote controller (70) is disposed closer to the second indoor unit (30B) than the radiation panel (40).
  • the second indoor unit (30B) may be thermo-off even though the air around the radiation panel (40) is not sufficiently warmed up. This is attributed to the fact that the heating capacity of the second indoor unit (30B) is higher than the heating capacity of the radiation panel (40) and that warm air tends to gather on the ceiling side.
  • the radiation panel (40) is also interlocked and the thermo-off, so the comfort around the radiation panel (40) closer to the occupants is impaired.
  • the number of times of starting and stopping of the second indoor unit (30B) and the radiation panel (40) may also increase.
  • the second indoor unit since the indoor temperature sensor (71) is disposed in the vicinity of the radiation panel (40), the second indoor unit (until the air around the radiation panel (40) is sufficiently warmed 30B) and the radiation panel (40) do not heat off. For this reason, it is possible to avoid the loss of comfort around the radiation panel (40), and to reduce the number of start / stop times of the second indoor unit (30B) and the radiation panel (40). The same applies to the cooling operation.
  • the indoor unit (30) is configured with a ceiling-mounted type (strictly, a ceiling-hanging type or a ceiling-embedded type), but this indoor unit (30) is installed on the floor of the room It is good also as a floor-standing type.
  • the indoor unit (30) and the radiation panel (40) share the indoor temperature sensor (71) as described above, the surroundings of both the indoor unit (30) and the radiation panel (40) It is easy to make the temperature converge to the target temperature. As a result, the comfort of the occupant can be further improved.
  • the indoor circuit (13) to which the indoor heat exchanger (31) and the indoor expansion valve (32) are connected, and the radiation circuit to which the radiant heat exchanger (52) and the radiant expansion valve (51) are connected 15) are provided in parallel. For this reason, in the cooling operation and the heating operation described above, the flow rates of the refrigerant flowing through the radiant heat exchanger (52) and the indoor heat exchanger (31) can be individually adjusted.
  • the adjustment range of the capacity of the radiant heat exchanger (52) and the capacity of the indoor heat exchanger (31) is larger than in the case of flowing in series.
  • the lower limit of the capacity of the radiant heat exchanger (52) can be made relatively small. Thereby, for example, a relatively low capacity radiant heat exchanger (52) can be applied to the air conditioner (10).
  • the indoor circuit (13) is provided in the indoor unit (30)
  • the radiation circuit (15) is provided in the radiation panel (40)
  • the indoor unit (30) and the radiation panel (40) are provided in the refrigerant circuit (11). Connected in parallel). Therefore, each capability of the indoor unit (30) and the radiation panel (40) can be individually controlled.
  • the inner diameter of the gas pipe (54) of the radiation circuit (15) is smaller than the inner diameter of the gas connection pipe (16). Since the radiation panel (40) tends to have a smaller capacity than the indoor unit (30), the flow rate of the refrigerant sent to the radiation panel (40) is higher than the flow rate of the refrigerant sent to the indoor unit (30) Less. Therefore, when the inner diameter of the gas pipe (54) is too large, the flow velocity of the refrigerant flowing through the gas pipe (54) becomes excessively small. As a result, for example, refrigeration oil tends to remain inside the gas pipe (54).
  • both the indoor heat exchanger (31) and the radiant heat exchanger (52) are used as radiators, and a refrigeration cycle is performed in which the refrigerant flows in parallel to these. Therefore, in the heating operation, the heating capacity of the indoor unit (30) and the heating capacity of the radiation panel (40) can be adjusted individually.
  • both the indoor heat exchanger (31) and the radiant heat exchanger (52) are used as evaporators, and a refrigeration cycle is performed in which the refrigerant flows in parallel to these. Therefore, in the cooling operation, the cooling capacity of the indoor unit (30) and the cooling capacity of the radiation panel (40) can be adjusted individually.
  • the indoor unit (13) and the radiation circuit (15) are connected in parallel, when only the radiation expansion valve (51) of the radiation expansion valve (51) and the indoor expansion valve (32) is closed, the indoor unit The cooling operation and the heating operation can be executed only by (30). Further, when only the indoor expansion valve (32) of the radiation expansion valve (51) and the indoor expansion valve (32) is closed, the cooling operation and the heating operation of only the radiation panel (40) can be performed. As described above, in the air conditioner (10), the operation for operating both the indoor unit (30) and the radiation panel (40), the operation for operating only the indoor unit (30), and the operation only for the radiation panel (40) It can be easily switched to driving.
  • the cooling capacity of the rating as the whole of an air conditioning apparatus (10) is 7.1 kW or more.
  • the sum total of the rated capacity of the indoor unit (30) and the radiation panel (40) is 50% or more and 200% or less of the rated capacity of the outdoor unit (20).
  • the "rated capacity" as used herein means the larger one of the capacity for cooling operation (cooling capacity) and the capacity for heating operation (heating capacity). Therefore, for example, in the air conditioner (10), when the cooling capacity is larger than the heating capacity, the total of the rated cooling capacities of the indoor unit (30) and the radiation panel (40) in the cooling operation is the outdoor unit in the cooling operation. 50% or more and 200% or less of the rated capacity of 20).
  • the total of the rated heating capacities of the indoor unit (30) and the radiation panel (40) in the heating capacity is the outdoor unit in the heating operation. 50% or more and 200% or less of the rated capacity of 20).
  • the degree of superheat of the opening degree of the radiation expansion valve (51) is controlled in the cooling operation. Therefore, the cooling capacity of the radiant heat exchanger (52) can be optimally adjusted, and the liquid compression of the compressor (21) can be avoided.
  • the degree of supercooling of the opening degree of the radiation expansion valve (51) is controlled in the heating operation.
  • the heating capacity of the radiant heat exchanger (52) can be optimally adjusted.
  • Embodiment 2 The air conditioner (10) according to the second embodiment differs from the first embodiment in the configuration of the refrigerant circuit (11).
  • the air conditioning apparatus (10) according to the second embodiment is configured to be able to execute simultaneous cooling and heating operation (details will be described later) in addition to the cooling operation and the heating operation of the first embodiment. The differences from the first embodiment will be mainly described below.
  • the refrigerant circuit (11) of the first embodiment is provided with three connection pipes (16, 17). Specifically, the first gas communication pipe (16A), the second gas communication pipe (16B), and the liquid communication pipe (17) are connected to the refrigerant circuit (11). That is, the air conditioning apparatus (10) is configured as a so-called three-tube type heating and cooling free type.
  • the air conditioner (10) may be a so-called two-tube cooling / heating free type having two connecting pipes and capable of simultaneous heating and cooling operation.
  • the outdoor circuit (12) includes a first outdoor heat exchanger (22A), a second outdoor heat exchanger (22B), a first outdoor expansion valve (23A), a second outdoor expansion valve (23B), and a first four-way switching.
  • a valve (24A) and a second four-way switching valve (24B) are provided.
  • the first outdoor heat exchanger (22A) and the second outdoor heat exchanger (22B) are connected in parallel to the outdoor circuit (12) so as to approach each other.
  • an outdoor fan (25) shared by these is installed in the vicinity of the first outdoor heat exchanger (22A) and the second outdoor heat exchanger (22B).
  • the first outdoor expansion valve (23A) is connected in series to the liquid side of the first outdoor heat exchanger (22A).
  • the second outdoor expansion valve (23B) is connected in series to the liquid side of the second outdoor heat exchanger (22B).
  • the first four-way switching valve (24A) and the second four-way switching valve (24B) constitute a switching mechanism for switching each operation which will be described in detail later. Specifically, the first four-way switching valve (24A) and the second four-way switching valve (24B) are in the first state (the state shown by the solid line in FIG. 4) and the second state (the state shown by the broken line in FIG. 4). Each is switchable.
  • the first four-way switching valve (24A) and the second four-way switching valve (24B) have one port closed and function substantially as a three-way valve.
  • the first four-way switching valve (24A) in the first state brings the discharge side of the compressor (21) into communication with the gas end of the first outdoor heat exchanger (22A).
  • the second four-way switching valve (24B) in the second state brings the suction side of the compressor (21) into communication with the gas end of the second outdoor heat exchanger (22B).
  • the first four-way switching valve (24A) in the second state brings the suction side of the compressor (21) into communication with the gas end of the first outdoor heat exchanger (22A).
  • the second four-way switching valve (24B) in the second state brings the discharge side of the compressor (21) into communication with the gas end of the second outdoor heat exchanger (22B).
  • the refrigerant circuit (11) of the second embodiment is connected to a first switching circuit (80) corresponding to the indoor circuit (13) and a second switching circuit (90) corresponding to the radiation circuit (15).
  • the first switching circuit (80) and the second switching circuit (90) are switching mechanisms for achieving simultaneous heating and cooling operation.
  • the indoor circuit (13) is connected to the three connection pipes (16A, 16B, 17) via the first switching circuit (80).
  • the radiation circuit (15) is connected to the three connection pipes (16A, 16B, 17) via the second switching circuit (90).
  • the first switching circuit (80) includes a first branch pipe (81), a second branch pipe (82), and a first relay pipe (83).
  • One end of the first branch pipe (81) is connected to the first gas communication pipe (16A), and one end of the second branch pipe (82) is connected to the second gas communication pipe (16B).
  • the other ends of the first branch pipe (81) and the second branch pipe (82) are connected to the gas end of the indoor circuit (13).
  • One end of the first relay pipe (83) is connected to the liquid communication pipe (17).
  • the other end of the first relay pipe (83) is connected to the liquid end of the indoor circuit (13).
  • the first branch pipe (81) is provided with a first on-off valve (84), and the second branch pipe (82) is provided with a second on-off valve (85).
  • the second switching circuit (90) includes a third branch pipe (91), a fourth branch pipe (92), and a second relay pipe (93).
  • One end of the third branch pipe (91) is connected to the first gas communication pipe (16A), and one end of the fourth branch pipe (92) is connected to the second gas communication pipe (16B).
  • the other ends of the third branch pipe (91) and the fourth branch pipe (92) are connected to the gas end of the radiation circuit (15).
  • One end of the second relay pipe (93) is connected to the liquid communication pipe (17).
  • the other end of the second relay pipe (93) is connected to the liquid end of the radiation circuit (15).
  • the third branch pipe (91) is provided with a third on-off valve (94), and the fourth branch pipe (92) is provided with a fourth on-off valve (95).
  • the indoor circuit (13) and the radiation circuit (15) are connected in parallel with each other.
  • the number of indoor circuits (13) and the number of first switching circuits (80) corresponding thereto may be two or more.
  • the number of the radiation circuit (15) and the corresponding second switching circuit (90) may be two or more.
  • the cooling operation, the heating operation, and the simultaneous heating and cooling operation are configured to be switchable.
  • the simultaneous heating and cooling operation includes at least two operations (first simultaneous heating and cooling operation and second simultaneous cooling and heating operation) described later.
  • the indoor unit (30) and the radiation panel (40) perform the cooling operation as in the first embodiment.
  • the compressor (21), the outdoor fan (25), and the indoor fan (33) are operated.
  • the first four-way switching valve (24A) is in the first state
  • the second four-way switching valve (24B) is in the first state.
  • the opening degree of the first outdoor expansion valve (23A) is opened to a predetermined opening degree (for example, full opening).
  • the degree of superheat of the opening degree of the indoor expansion valve (32) and the radiation expansion valve (51) is controlled.
  • the first on-off valve (84) and the third on-off valve (94) are closed, and the second on-off valve (85) and the fourth on-off valve (95) are open.
  • a refrigeration cycle is performed in which the refrigerant condensed and radiated by the outdoor heat exchanger (22) is evaporated by the indoor heat exchanger (31) and the radiant heat exchanger (52).
  • the refrigerant compressed by the compressor (21) flows through the first outdoor heat exchanger (22A).
  • the refrigerant condensed by the first outdoor heat exchanger (22A) flows through the liquid communication pipe (17) after passing through the outdoor expansion valve (23).
  • the refrigerant flowing through the liquid communication pipe (17) is branched into the indoor circuit (13) and the radiation circuit (15).
  • the refrigerant flowing through the indoor circuit (13) is reduced in pressure by the indoor expansion valve (32) and then evaporated in the indoor heat exchanger (31).
  • a cooling operation is performed to cool the indoor air.
  • the refrigerant evaporated in the indoor heat exchanger (31) flows out to the second gas connection pipe (16B) via the second branch pipe (82).
  • the refrigerant flowing through the radiation circuit (15) is depressurized by the radiation expansion valve (51) and then evaporated by the radiation heat exchanger (52). Thereby, in the radiation panel (40), a cooling operation is performed to cool the indoor air.
  • the refrigerant evaporated by the radiation panel (40) flows out to the second gas connection pipe (16B) via the fourth branch pipe (92).
  • the refrigerant joined in the second gas connection pipe (16B) is sucked into the compressor (21) and compressed again.
  • the indoor unit (30) and the radiation panel (40) perform the heating operation as in the first embodiment.
  • the compressor (21), the outdoor fan (25), and the indoor fan (33) are operated.
  • the first four-way switching valve (24A) is in the second state
  • the second four-way switching valve (24B) is in the first state.
  • the opening degree of the first outdoor expansion valve (23A) is subjected to superheat degree control.
  • the degree of supercooling control of the opening degree of the indoor expansion valve (32) and the radiation expansion valve (51) is performed.
  • the first on-off valve (84) and the third on-off valve (94) are opened, and the second on-off valve (85) and the fourth on-off valve (95) are closed.
  • a refrigeration cycle is performed in which the refrigerant condensed and radiated by the indoor heat exchanger (31) and the radiant heat exchanger (52) is evaporated by the outdoor heat exchanger (22).
  • the refrigerant compressed by the compressor (21) flows through the first gas connection pipe (16A) and is diverted to the first switching circuit (80) and the second switching circuit (90).
  • the refrigerant of the first switching circuit (80) flows into the indoor circuit (13) via the first branch pipe (81).
  • the refrigerant of the second switching circuit (90) flows into the radiation circuit (15) via the third branch pipe (91).
  • the refrigerant flowing into the indoor circuit (13) condenses and dissipates heat in the indoor heat exchanger (31).
  • a heating operation is performed in which the indoor air is heated.
  • the refrigerant condensed by the indoor heat exchanger (31) flows out to the liquid communication pipe (17) via the first relay pipe (83).
  • the refrigerant flowing into the radiation circuit (15) condenses and dissipates heat in the radiant heat exchanger (52). Thereby, in the radiation panel (40), a heating operation in which the indoor air is heated is performed.
  • the refrigerant condensed by the radiant heat exchanger (52) flows out to the liquid communication pipe (17) via the second relay pipe (93).
  • the refrigerant joined in the liquid communication pipe (17) flows into the outdoor circuit (12), and is decompressed by, for example, the first outdoor expansion valve (23A), and then evaporated in the first outdoor heat exchanger (22A).
  • the refrigerant evaporated in the first outdoor heat exchanger (22A) is sucked into the compressor (21) and compressed again.
  • the radiation panel (40) performs the cooling operation at the same time as the indoor unit (30) performs the heating operation.
  • the indoor unit (30) and the radiation panel (40) are disposed in different indoor spaces.
  • the first simultaneous cooling operation can also be performed while arranging the indoor unit (30) and the radiation panel (40) in the same indoor space.
  • the compressor (21), the outdoor fan (25), and the indoor fan (33) are operated.
  • the first four-way switching valve (24A) is in the first state
  • the second four-way switching valve (24B) is in the first state.
  • the opening degree of the first outdoor expansion valve (23A) is opened to a predetermined opening degree (for example, full opening).
  • the degree of opening of the indoor expansion valve (32) is subjected to subcooling control.
  • the degree of opening of the radiation expansion valve (51) is controlled at the degree of superheat.
  • the first on-off valve (84) and the fourth on-off valve (95) are opened, and the second on-off valve (85) and the third on-off valve (94) are closed.
  • a refrigeration cycle is performed in which the refrigerant condensed and dissipated in the first outdoor heat exchanger (22A) and the indoor heat exchanger (31) evaporates in the radiant heat exchanger (52).
  • the second outdoor heat exchanger (22B) may be used as an evaporator while controlling the degree of superheat of the opening degree of the second outdoor expansion valve (23B).
  • a part of the refrigerant compressed by the compressor (21) is condensed in the first outdoor heat exchanger (22A), and the rest flows out to the first gas communication pipe (16A).
  • the refrigerant of the first gas connection pipe (16A) flows into the indoor circuit (13) via the first branch pipe (81).
  • the refrigerant flowing into the indoor circuit (13) condenses and dissipates heat in the indoor heat exchanger (31).
  • a heating operation is performed in which the indoor air is heated.
  • the refrigerant condensed by the indoor heat exchanger (31) flows out to the liquid communication pipe (17) via the first relay pipe (83).
  • the refrigerant condensed in the first outdoor heat exchanger (22A) flows out to the liquid communication pipe (17), and joins with the refrigerant condensed in the indoor heat exchanger (31).
  • the refrigerant merged in the liquid communication pipe (17) flows into the radiation circuit (15) via the second relay pipe (93).
  • the refrigerant flowing into the radiation circuit (15) is reduced in pressure by the radiation expansion valve (51) and then evaporated in the radiation heat exchanger (52). Thereby, in the radiation panel (40), a cooling operation is performed to cool the indoor air.
  • the refrigerant evaporated by the radiation panel (40) flows out to the second gas connection pipe (16B) via the fourth branch pipe (92).
  • the refrigerant in the second gas connection pipe (16B) is sucked into the compressor (21) and compressed again.
  • the indoor unit (30) performs the cooling operation and the radiation panel (40) performs the heating operation at the same time.
  • the indoor unit (30) and the radiation panel (40) are arranged in different indoor spaces.
  • the second cooling simultaneous operation can also be performed while arranging the indoor unit (30) and the radiation panel (40) in the same indoor space.
  • the compressor (21), the outdoor fan (25), and the indoor fan (33) are operated.
  • the first four-way switching valve (24A) is in the first state
  • the second four-way switching valve (24B) is in the first state.
  • the opening degree of the first outdoor expansion valve (23A) is opened to a predetermined opening degree (for example, full opening).
  • the degree of opening of the indoor expansion valve (32) is controlled to the degree of superheat.
  • the degree of opening of the radiation expansion valve (51) is subjected to subcooling control.
  • the second on-off valve (85) and the third on-off valve (94) are opened, and the first on-off valve (84) and the fourth on-off valve (95) are closed.
  • a refrigeration cycle is performed in which the refrigerant condensed and dissipated in the first outdoor heat exchanger (22A) and the radiant heat exchanger (52) evaporates in the indoor heat exchanger (31).
  • the second outdoor heat exchanger (22B) may be used as an evaporator while controlling the degree of superheat of the opening degree of the second outdoor expansion valve (23B).
  • a part of the refrigerant compressed by the compressor (21) is condensed in the first outdoor heat exchanger (22A), and the rest flows out to the first gas communication pipe (16A).
  • the refrigerant of the first gas connection pipe (16A) flows into the radiation circuit (15) via the third branch pipe (91).
  • the refrigerant flowing into the radiation circuit (15) condenses and dissipates heat in the radiant heat exchanger (52). Thereby, in the radiation panel (40), a heating operation in which the indoor air is heated is performed.
  • the refrigerant condensed by the radiant heat exchanger (52) flows out to the liquid communication pipe (17) via the second relay pipe (93).
  • the refrigerant condensed in the first outdoor heat exchanger (22A) flows out to the liquid communication pipe (17), and merges with the refrigerant condensed in the radiant heat exchanger (52).
  • the refrigerant joined in the liquid communication pipe (17) flows into the indoor circuit (13) via the second branch pipe (82).
  • the refrigerant flowing into the indoor circuit (13) is depressurized by the indoor expansion valve (32) and then evaporated in the indoor heat exchanger (31).
  • a cooling operation is performed to cool the indoor air.
  • the refrigerant evaporated in the indoor heat exchanger (31) flows out to the second gas connection pipe (16B) via the second branch pipe (82).
  • the refrigerant in the second gas connection pipe (16B) is sucked into the compressor (21) and compressed again.
  • the refrigerant joined in the liquid communication pipe (17) flows into the indoor circuit (13) via the second relay pipe (93).
  • the refrigerant flowing into the indoor circuit (13) is depressurized by the indoor expansion valve (32) and then evaporated in the indoor heat exchanger (31).
  • a heating operation is performed in which the indoor air is heated.
  • the refrigerant evaporated in the indoor unit (30) flows out to the second gas connection pipe (16B) via the second branch pipe (82).
  • the refrigerant in the second gas connection pipe (16B) is sucked into the compressor (21) and compressed again.
  • the indoor circuit (13) and the radiation circuit (15) are connected in parallel. For this reason, in the cooling operation, the flow rates of the refrigerant evaporated in the indoor heat exchanger (31) and the radiant heat exchanger (52) can be individually controlled. Similarly, in the heating operation, the flow rates of the refrigerant condensed in the indoor heat exchanger (31) and the radiant heat exchanger (52) can be individually controlled.
  • the second embodiment it is possible to perform a refrigeration cycle in which one of the indoor heat exchanger (31) and the radiant heat exchanger (52) is a radiator and the other is an evaporator.
  • the indoor heat exchanger (31) is a radiator and the radiation heat exchanger (52) is an evaporator. Therefore, the heating operation can be performed by the indoor unit (30) and the cooling operation can be realized by the radiation panel (40) at the same time.
  • the second simultaneous cooling and heating operation it is possible to perform a refrigeration cycle in which the radiant heat exchanger (52) is a radiator and the indoor heat exchanger (31) is an evaporator. Therefore, the heating operation can be performed by the radiation panel (40) and the cooling operation can be realized by the indoor unit (30) at the same time.
  • Embodiment 3 In the air conditioner (10) according to the third embodiment shown in FIG. 9, the indoor circuit (13) and the radiation circuit (15) are provided in one air conditioning unit (U).
  • the air conditioning unit (U) is configured to be installed on a floor surface in a room.
  • the outdoor unit (20) having the same configuration as that of the first embodiment and the air conditioning unit (U) are connected via the gas communication pipe (16) and the liquid communication pipe (17). Connected to each other.
  • the four-way switching valve (24) is in the first state (state shown by the solid line in FIG. 9) in the cooling operation, and is in the second state (state shown by the broken line in FIG. 9) in the heating operation.
  • the cooling operation and the heating operation of the third embodiment are basically the same as the first embodiment. That is, in the cooling operation, the refrigerant compressed by the compressor (21) is condensed by the outdoor heat exchanger (22) and is evaporated by the indoor heat exchanger (31) and the radiant heat exchanger (52). In the heating operation, the refrigerant compressed by the compressor (21) is condensed by the indoor heat exchanger (31) and the radiant heat exchanger (52), and is evaporated by the outdoor heat exchanger (22).
  • the indoor circuit (13) and the radiation circuit (15) are connected in parallel with each other. Therefore, in the cooling operation and the heating operation, the flow rate of the refrigerant flowing through the indoor circuit (13) and the radiation circuit (15) can be individually controlled by the indoor expansion valve (32) and the radiation expansion valve (51).
  • the cooling operation is performed only with the radiation panel (40) by setting the opening degree of the indoor expansion valve (32) to fully close or zero or opening the radiation expansion valve (51) at a predetermined opening degree. It is possible to Similarly, in the cooling operation, the opening degree of the radiation expansion valve (51) is fully closed or to zero, and the indoor expansion valve (32) is opened at a predetermined opening degree, so that only the indoor heat exchanger (31) cools. It is also possible to perform an operation.
  • the heating operation is performed only with the radiation panel (40) by setting the opening degree of the indoor expansion valve (32) to fully close or zero, and opening the radiation expansion valve (51) at a predetermined opening degree. It is possible to Similarly, in the heating operation, the opening degree of the radiation expansion valve (51) is fully closed or zero, and the indoor expansion valve (32) is opened at a predetermined opening degree, so that heating is performed only with the indoor heat exchanger (31). It is also possible to perform an operation.
  • the indoor unit (30) is a floor-standing type installed on the floor surface or a wall-mounted type installed on a wall surface besides ceiling-mounted type (strictly, ceiling-hanging type or ceiling-embedding type) provided on the ceiling side It may be a formula.
  • the radiation panel (40) may be a ceiling-mounted type provided on the ceiling side or a wall-mounted type provided on a wall surface.
  • the air conditioner (10) may be controlled as in the following embodiments 1 to 3 and other embodiments.
  • the cooling operation of the air conditioner (10) includes a first operation, a second operation, and a third operation.
  • the indoor unit (30) of the indoor unit (30) and the radiation panel (40) performs the cooling operation.
  • the indoor heat exchanger (31) and the radiant heat exchanger (52) only the indoor heat exchanger (31) performs the cooling operation.
  • the indoor expansion valve (32) corresponding to the indoor heat exchanger (31) is opened.
  • the degree of opening of the indoor expansion valve (32) is controlled based on the degree of superheat SH1 of the refrigerant flowing out of the indoor heat exchanger (31).
  • the opening degree of the radiation expansion valve (51) corresponding to the radiation panel (40) is controlled to be fully closed or slightly open.
  • the "small opening degree” referred to herein is an opening degree at which the radiation heat exchanger (52) substantially does not perform the cooling operation.
  • the indoor fan (33) is operated.
  • the outdoor heat exchanger (22) is a condenser or a radiator
  • the indoor heat exchanger (31) is an evaporator
  • the radiation cycle (52) is stopped Is done.
  • the radiation expansion valve (51) corresponding to the radiation heat exchanger (52) is opened.
  • the opening degree of the radiation expansion valve (51) is controlled based on the degree of superheat SH2 of the refrigerant flowing out of the radiation heat exchanger (52).
  • the opening degree of the indoor expansion valve (32) corresponding to the indoor unit (30) is controlled to be fully closed or slightly open.
  • the "small opening degree” referred to herein is an opening degree at which the cooling operation is not substantially performed in the indoor heat exchanger (31).
  • the indoor fan (33) is stopped.
  • the indoor unit (30) and the radiation panel (40) perform a cooling operation.
  • the indoor heat exchanger (31) and the radiant heat exchanger (52) perform the cooling operation.
  • the indoor expansion valve (32) corresponding to the indoor heat exchanger (31) is opened.
  • the degree of opening of the indoor expansion valve (32) is controlled based on the degree of superheat SH1 of the refrigerant flowing out of the indoor heat exchanger (31).
  • the radiation expansion valve (51) corresponding to the radiation heat exchanger (52) is opened.
  • the opening degree of the radiation expansion valve (51) is controlled based on the degree of superheat SH2 of the refrigerant flowing out of the radiation heat exchanger (52).
  • the indoor fan (33) is operated.
  • the air conditioning apparatus (10) includes a control unit that switches the first operation, the second operation, and the third operation based on an index indicating a cooling load in the room.
  • the control unit includes the indoor controller (C1) and the radiation controller (C2) described above.
  • the index indicating the cooling load is the difference (Tr ⁇ Ts) between the temperature Tr of the indoor air described above and the set temperature Ts.
  • the indoor temperature sensor (71) constitutes a load detection unit that detects a cooling load. The index indicating the cooling load is not limited to this.
  • the air conditioner (10) performs the third operation at the start of the cooling operation.
  • the indoor unit (30) and the radiation panel (40) perform a cooling operation.
  • the cooling load in the room can be rapidly reduced.
  • the third operation is switched to the second operation when a condition is established in which the cooling load in the room is lower than a predetermined value.
  • the radiation panel (40) performs the cooling operation. This second operation can suppress the room temperature from becoming excessively low. In addition, cold air blown from the indoor unit (30) can be reliably avoided from hitting the occupants.
  • the third operation may not necessarily be performed only at the start of the cooling operation. After the start of the cooling operation, the third operation is performed when the condition for the indoor cooling load to become higher than a predetermined value is satisfied. By the third operation, the cooling load in the room can be rapidly reduced. Also in this case, the third operation is switched to the second operation when a condition is established in which the cooling load in the room is lower than a predetermined value during the third operation. In the second operation, only the radiation panel (40) performs the cooling operation. This second operation can suppress the room temperature from becoming excessively low. In addition, cold air blown from the indoor unit (30) can be reliably avoided from hitting the occupants.
  • the heating operation of the air conditioner (10) includes a fourth operation, a fifth operation, and a sixth operation.
  • the indoor unit (30) of the indoor unit (30) and the radiation panel (40) performs a heating operation.
  • the indoor heat exchanger (31) and the radiant heat exchanger (52) only the indoor heat exchanger (31) performs the heating operation.
  • the indoor expansion valve (32) corresponding to the indoor heat exchanger (31) is opened.
  • the degree of opening of the indoor expansion valve (32) is controlled based on the degree of supercooling SC1 of the refrigerant flowing out of the indoor heat exchanger (31).
  • the opening degree of the radiation expansion valve (51) corresponding to the radiation panel (40) is controlled to be fully closed or slightly open.
  • the "small opening degree” referred to here is an opening degree at which the heating operation is not substantially performed by the radiation heat exchanger (52).
  • the indoor fan (33) is operated.
  • the radiation panel (40) of the indoor unit (30) and the radiation panel (40) performs a heating operation.
  • the radiant heat exchanger (52) performs the heating operation.
  • the radiation expansion valve (51) corresponding to the radiation heat exchanger (52) is opened.
  • the opening degree of the radiation expansion valve (51) is controlled based on the degree of subcooling SC2 of the refrigerant flowing out of the radiation heat exchanger (52).
  • the opening degree of the indoor expansion valve (32) corresponding to the indoor unit (30) is controlled to be fully closed or slightly open.
  • the "small opening degree” referred to here is an opening degree at which the heating operation is not substantially performed by the indoor heat exchanger (31).
  • the indoor fan (33) is stopped.
  • the radiation heat exchanger (52) is a condenser or a radiator
  • the outdoor heat exchanger (22) is an evaporator
  • the refrigeration cycle for stopping the indoor heat exchanger (31) Is done.
  • the indoor unit (30) and the radiation panel (40) perform a heating operation.
  • the indoor heat exchanger (31) and the radiant heat exchanger (52) perform the heating operation.
  • the indoor expansion valve (32) corresponding to the indoor heat exchanger (31) is opened.
  • the degree of opening of the indoor expansion valve (32) is controlled based on the degree of supercooling SC1 of the refrigerant flowing out of the indoor heat exchanger (31).
  • the radiation expansion valve (51) corresponding to the radiation heat exchanger (52) is opened.
  • the opening degree of the radiation expansion valve (51) is controlled based on the degree of subcooling SC2 of the refrigerant flowing out of the radiation heat exchanger (52).
  • the indoor fan (33) is operated.
  • a refrigeration cycle is performed in which the indoor heat exchanger (31) and the radiant heat exchanger (52) are a condenser or a radiator and the outdoor heat exchanger (22) is an evaporator. .
  • the air conditioner (10) includes a control unit that switches the fourth operation, the fifth operation, and the sixth operation based on the index indicating the heating load in the room.
  • the control unit includes the indoor controller (C1) and the radiation controller (C2) described above.
  • the index indicating the heating load is the difference (Ts ⁇ Tr) between the set temperature Ts and the indoor temperature Tr.
  • the indoor temperature sensor (71) constitutes a load detection unit that detects a heating load. The index indicating the heating load is not limited to this.
  • the air conditioner (10) performs the sixth operation at the start of the heating operation.
  • the indoor unit (30) and the radiation panel (40) perform a heating operation.
  • the heating load in the room can be rapidly reduced.
  • the sixth operation is switched to the fifth operation when a condition for the indoor heating load to fall below a predetermined value is satisfied.
  • the fifth operation only the radiation panel (40) performs the heating operation. This fifth operation can suppress the room temperature from becoming excessively high. In addition, it is possible to reliably prevent the warm air blown out from the indoor unit (30) from hitting the occupants.
  • the sixth operation may not necessarily be performed only at the start of the heating operation. After the start of the heating operation, the sixth operation is performed when a condition is established in which the indoor heating load is higher than a predetermined value. By the sixth operation, the heating load in the room can be rapidly reduced. Also in this case, the sixth operation is switched to the fifth operation when the condition for the indoor heating load to fall below a predetermined value is satisfied during the sixth operation. In the fifth operation, only the radiation panel (40) performs the heating operation. This fifth operation can suppress the room temperature from becoming excessively high. In addition, it is possible to reliably prevent the warm air blown out from the indoor unit (30) from hitting the occupants.
  • the present disclosure is useful for an air conditioner.

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Abstract

A refrigerant circuit (11) includes an outdoor circuit (12) to which a compressor (21) and an outdoor heat exchanger (22) are connected, an indoor circuit (13) to which an indoor heat exchanger (31) and a first adjustment valve (32) are connected, and a radiation circuit (15) to which a radiation heat exchanger (52) and a second adjustment valve (51) are connected. In the refrigerant circuit (11), the indoor circuit (13) and the radiation circuit (15) are connected parallelly.

Description

空気調和装置Air conditioner
　本開示は、空気調和装置に関する。 The present disclosure relates to an air conditioner.
　特許文献１には、輻射型室内機と対流型室内機とを備えた空気調和装置が開示されている。輻射型室内機と、対流型室内機とは、冷媒回路に直列に接続される。例えば暖房運転では、冷媒が輻射型室内機の発熱体で放熱・凝縮する。次いで、冷媒は対流側室内機で更に放熱・凝縮する。 Patent Document 1 discloses an air conditioner provided with a radiation type indoor unit and a convection type indoor unit. The radiation type indoor unit and the convection type indoor unit are connected in series to the refrigerant circuit. For example, in the heating operation, the refrigerant dissipates heat and condenses in the heating element of the radiation type indoor unit. Next, the refrigerant further dissipates heat and condenses in the convection side indoor unit.
特開２０１５－２５６２７号公報JP 2015-25627 A
　特許文献１の空気調和装置では、室内熱交換器と輻射熱交換器とが直列に接続される。このため、室内熱交換器を流れる冷媒の流量と、輻射熱交換器を流れる冷媒の流量とをそれぞれ個別に制御することが困難であった。 In the air conditioner of Patent Document 1, the indoor heat exchanger and the radiant heat exchanger are connected in series. Therefore, it has been difficult to individually control the flow rate of the refrigerant flowing through the indoor heat exchanger and the flow rate of the refrigerant flowing through the radiant heat exchanger.
　本開示の目的は、室内熱交換器を流れる冷媒の流量と、輻射熱交換器を流れる冷媒の流量とを個別に制御できる空気調和装置を提供することである。 An object of the present disclosure is to provide an air conditioner that can individually control the flow rate of the refrigerant flowing through the indoor heat exchanger and the flow rate of the refrigerant flowing through the radiant heat exchanger.
　第１の態様は、圧縮機（21）及び室外熱交換器（22,22A）が接続される室外回路（12）と、室内熱交換器（31）及び第１調節弁（32）が接続される室内回路（13）と、輻射熱交換器（52）及び第２調節弁（51）が接続される輻射回路（15）とを含む冷媒回路（11）を備えた空気調和装置であって、上記冷媒回路（11）では、前記室内回路（13）と前記輻射回路（15）とが並列に接続されることを特徴とする空気調和装置である。 In the first aspect, an outdoor circuit (12) to which a compressor (21) and an outdoor heat exchanger (22, 22A) are connected, an indoor heat exchanger (31) and a first control valve (32) are connected An air conditioner comprising a refrigerant circuit (11) including an indoor circuit (13) and a radiation circuit (15) to which the radiant heat exchanger (52) and the second control valve (51) are connected, In the refrigerant circuit (11), the indoor circuit (13) and the radiation circuit (15) are connected in parallel.
　第１の態様では、冷媒が室内回路（13）及び輻射回路（15）とに分流する。第１調節弁（32）及び第２調節弁（51）の開度をそれぞれ制御することで、室内熱交換器（31）を流れる冷媒の流量と、輻射熱交換器（52）を流れる冷媒の流量とをそれぞれ個別に調節できる。 In the first aspect, the refrigerant is diverted to the indoor circuit (13) and the radiation circuit (15). The flow rates of the refrigerant flowing through the indoor heat exchanger (31) and the flow rates of the refrigerant flowing through the radiant heat exchanger (52) are controlled by controlling the opening degree of the first control valve (32) and the second control valve (51) respectively. And can be adjusted individually.
　第２の態様は、第１の態様において、前記室外回路（12）は、室外ユニット（20）に設けられ、前記室内回路（13）は、室内ユニット（30）に設けられ、前記輻射回路（15）は、輻射パネル（40）に設けられることを特徴とする空気調和装置である。 A 2nd aspect is a 1st aspect, The said outdoor circuit (12) is provided in the outdoor unit (20), The said indoor circuit (13) is provided in the indoor unit (30), The said radiation circuit ( 15) is an air conditioner characterized in that the radiation panel (40) is provided.
　第２の態様では、第１調節弁（32）及び第２調節弁（51）の開度をそれぞれ制御することで、室内ユニット（30）の能力と、輻射パネル（40）の能力とを個別に制御できる。 In the second aspect, the capacity of the indoor unit (30) and the capacity of the radiation panel (40) are individually controlled by controlling the opening degree of the first control valve (32) and the second control valve (51) respectively. Can be controlled.
　第３の態様は、第１又は２の態様において、前記冷媒回路（11）は、前記室外熱交換器（22）に接続するガス連絡配管（16）と、該ガス連絡配管（16）から分岐して前記輻射熱交換器（52）に接続するガス管（54）とを有し、前記ガス管（54）の内径が、前記ガス連絡配管（16）の内径よりも小さいことを特徴とする空気調和装置である。 According to a third aspect, in the first or second aspect, the refrigerant circuit (11) branches from a gas communication pipe (16) connected to the outdoor heat exchanger (22), and the gas communication pipe (16) And a gas pipe (54) connected to the radiant heat exchanger (52), wherein the inside diameter of the gas pipe (54) is smaller than the inside diameter of the gas communication pipe (16) It is a harmony device.
　第３の態様では、冷媒の流量が比較的少ない輻射回路（15）のガス管（54）の内径が小さくなるため、ガス管（54）を流れる冷媒の流速が小さくなり過ぎるのを抑制できる。 In the third aspect, since the inner diameter of the gas pipe (54) of the radiation circuit (15) having a relatively small flow rate of the refrigerant becomes small, the flow velocity of the refrigerant flowing through the gas pipe (54) can be suppressed from becoming too small.
　第４の態様は、第１乃至３の態様のいずれか１つにおいて、前記冷媒回路（11）は、前記室内熱交換器（31）の少なくとも１つと、前記輻射熱交換器（52）の少なくとも１つとが放熱器となる冷凍サイクルを行うように構成されることを特徴とする空気調和装置である。 In a fourth aspect according to any one of the first to third aspects, the refrigerant circuit (11) comprises at least one of the indoor heat exchanger (31) and at least one of the radiant heat exchanger (52). The air conditioner is characterized in that it is configured to perform a refrigeration cycle in which the heat sink becomes a radiator.
　第４の態様では、室内熱交換器（31）の暖房能力と、輻射熱交換器（52）の暖房能力とを個別に制御できる。 In the fourth aspect, the heating capacity of the indoor heat exchanger (31) and the heating capacity of the radiant heat exchanger (52) can be individually controlled.
　第５の態様は、第１乃至４の態様のいずれか１つにおいて、前記冷媒回路（11）は、前記室内熱交換器（31）の少なくとも１つと、前記輻射熱交換器（52）の少なくとも１つとが蒸発器となる冷凍サイクルを行うように構成されることを特徴とする空気調和装置である。 According to a fifth aspect, in any one of the first to fourth aspects, the refrigerant circuit (11) includes at least one of the indoor heat exchanger (31) and at least one of the radiant heat exchanger (52). The air conditioner is characterized in that it is configured to perform a refrigeration cycle in which the one and the other become an evaporator.
　第５の態様では、室内熱交換器（31）の冷房能力と、輻射熱交換器（52）の冷房能力とを個別に制御できる。 In the fifth aspect, the cooling capacity of the indoor heat exchanger (31) and the cooling capacity of the radiant heat exchanger (52) can be controlled separately.
　第６の態様は、第１乃至５の態様のいずれか１つにおいて、前記冷媒回路（11）は、前記室内熱交換器（31）及び前記輻射熱交換器（52）の一方が放熱器となり、他方が蒸発器となる冷凍サイクルを行うように構成されることを特徴とする空気調和装置である。 In a sixth aspect according to any one of the first to fifth aspects, in the refrigerant circuit (11), one of the indoor heat exchanger (31) and the radiant heat exchanger (52) is a radiator. It is an air conditioner characterized in that it is configured to perform a refrigeration cycle in which the other is an evaporator.
　第６の態様では、室内熱交換器（31）及び輻射熱交換器（52）の一方で暖房動作を行い、他方で冷房動作を行う運転が実現可能となる。 In the sixth aspect, it is possible to realize an operation in which one of the indoor heat exchanger (31) and the radiant heat exchanger (52) performs the heating operation and the other performs the cooling operation.
　第７の態様は、第１乃至６の態様のいずれか１つにおいて、前記輻射熱交換器（52）が放熱器となる冷凍サイクル中に、該輻射熱交換器（52）の流出側の冷媒の過冷却度が所定値となるように前記第２調節弁（51）の開度を制御する制御部（C2）を備えていることを特徴とする空気調和装置である。 In a seventh aspect according to any one of the first to sixth aspects, the refrigerant on the outflow side of the radiant heat exchanger (52) has an excess during the refrigeration cycle in which the radiant heat exchanger (52) is a radiator. A control unit (C2) for controlling the degree of opening of the second control valve (51) such that the degree of cooling reaches a predetermined value is an air conditioner characterized in that
　第７の態様では、輻射熱交換器（52）で暖房動作が行われる冷凍サイクル中において、第２調節弁（51）の開度が過冷却度制御される。 In the seventh aspect, the degree of supercooling of the opening degree of the second control valve (51) is controlled during the refrigeration cycle in which the heating operation is performed by the radiant heat exchanger (52).
　第８の態様は、第１乃至７の態様のいずれか１つにおいて、前記輻射熱交換器（52）が蒸発器となる運転中に、該輻射熱交換器（52）の流出側の冷媒の過熱度が所定値となるように前記第２調節弁（51）の開度を制御する制御部（C2）を備えていることを特徴とする空気調和装置である。 In an eighth aspect according to any one of the first to seventh aspects, the superheat degree of the refrigerant on the outflow side of the radiant heat exchanger (52) during the operation in which the radiant heat exchanger (52) becomes an evaporator. A control unit (C2) is provided to control the opening degree of the second control valve (51) so that the value of d becomes a predetermined value.
　第８の態様では、輻射熱交換器（52）で冷房動作が行われる冷凍サイクル中において、第１調節弁（32）の開度が過熱度制御される。 In the eighth aspect, the degree of superheat control of the opening degree of the first control valve (32) is performed during the refrigeration cycle in which the cooling operation is performed by the radiant heat exchanger (52).
　第９の態様は、第２乃至８の態様のいずれか１つにおいて、前記空気調和装置全体の定格冷房能力が、７．１ｋＷ以上であることを特徴とする空気調和装置である。 A ninth aspect is the air conditioning apparatus according to any one of the second to eighth aspects, wherein the rated cooling capacity of the entire air conditioning apparatus is 7.1 kW or more.
　第１０の態様は、第２において、前記室内ユニット（30）及び前記輻射パネル（40）の定格能力の合計が、前記室外ユニット（20）の定格能力の５０％以上２００％以下の範囲であることを特徴とする空気調和装置である。 In a tenth aspect, in the second aspect, the total of the rated capacities of the indoor unit (30) and the radiation panel (40) is in the range of 50% to 200% of the rated capacity of the outdoor unit (20). It is an air conditioner characterized by things.
　第１１の態様は、第１乃至第１０の態様のいずれか１つにおいて、前記室内熱交換器（31）及び前記輻射熱交換器（52）のうち前記輻射熱交換器（52）のみで冷房動作を行う冷房運転を行うことを特徴とする空気調和装置である。 In an eleventh aspect according to any one of the first to tenth aspects, the cooling operation is performed only with the radiant heat exchanger (52) among the indoor heat exchanger (31) and the radiant heat exchanger (52). An air conditioning apparatus characterized by performing a cooling operation to be performed.
　第１２の態様は、第１乃至第１１のいずれか１つにおいて、前記室内熱交換器（31）及び前記輻射熱交換器（52）のうち前記輻射熱交換器（52）のみで暖房動作を行う暖房運転を行うことを特徴とする空気調和装置である。 The twelfth aspect is the heating according to any one of the first to eleventh, wherein the heating operation is performed only with the radiant heat exchanger (52) among the indoor heat exchanger (31) and the radiant heat exchanger (52). It is an air conditioner characterized by performing operation.
図１は、実施形態１に係る空気調和装置の概略構成を示す配管系統図である。FIG. 1 is a piping system diagram showing a schematic configuration of the air conditioning apparatus according to the first embodiment. 図２は、実施形態１に係る輻射パネルの概略構成を示す正面図である。FIG. 2 is a front view showing a schematic configuration of the radiation panel according to the first embodiment. 図３は、実施形態１に係る空気調和装置の概略の構成図である。FIG. 3 is a schematic block diagram of the air conditioning apparatus according to the first embodiment. 図４は、実施形態２に係る空気調和装置の概略構成を示す配管系統図である。FIG. 4 is a piping system diagram showing a schematic configuration of the air conditioning apparatus according to the second embodiment. 図５は、実施形態２係る空気調和装置の概略構成を示す配管系統図であり、冷房運転の冷媒の流れを付与したものである。FIG. 5 is a piping system diagram showing a schematic configuration of the air conditioning apparatus according to Embodiment 2, to which the flow of the refrigerant in the cooling operation is applied. 図６は、実施形態２係る空気調和装置の概略構成を示す配管系統図であり、暖房運転の冷媒の流れを付与したものである。FIG. 6 is a piping system diagram showing a schematic configuration of the air conditioning apparatus according to Embodiment 2, to which a flow of refrigerant for heating operation is applied. 図７は、実施形態２係る空気調和装置の概略構成を示す配管系統図であり、第１冷暖同時運転の冷媒の流れを付与したものである。FIG. 7 is a piping system diagram showing a schematic configuration of the air conditioning apparatus according to Embodiment 2, to which the flow of the refrigerant in the first simultaneous heating and cooling operation is given. 図８は、実施形態２係る空気調和装置の概略構成を示す配管系統図であり、第２冷暖同時運転の冷媒の流れを付与したものである。FIG. 8 is a piping diagram showing a schematic configuration of the air conditioning apparatus according to Embodiment 2, to which the flow of the refrigerant in the second simultaneous heating and cooling operation is given. 図９は、実施形態３に係る空気調和装置の概略構成を示す配管系統図である。FIG. 9 is a piping diagram showing a schematic configuration of the air conditioning apparatus according to the third embodiment.
　《実施形態１》
　本実施形態１の空気調和装置（10）について図面を参照しながら説明する。 Embodiment 1
An air conditioner (10) of the first embodiment will be described with reference to the drawings.
　〈全体構成〉
　空気調和装置（10）は、室内の冷房及び暖房を切り換えて行う。図１に示すように、空気調和装置（10）は、室外ユニット（20）と、室内ユニット（30）と、輻射パネル（40）とを備える。 <overall structure>
The air conditioner (10) switches between cooling and heating of the room. As shown in FIG. 1, the air conditioner (10) includes an outdoor unit (20), an indoor unit (30), and a radiation panel (40).
　室外ユニット（20）は、室外に設置される。室外ユニット（20）は、熱源ユニットを構成している。室外ユニット（20）には、圧縮機（21）、室外熱交換器（22）、室外膨張弁（23）、四方切換弁（24）、及び室外ファン（25）が設けられる。 The outdoor unit (20) is installed outdoors. The outdoor unit (20) constitutes a heat source unit. The outdoor unit (20) is provided with a compressor (21), an outdoor heat exchanger (22), an outdoor expansion valve (23), a four-way switching valve (24), and an outdoor fan (25).
　室内ユニット（30）は、室内の天井付近に設けられる。室内ユニット（30）は、室内ファン（33）によって搬送される空気により、冷房又は暖房を行う対流型の室内機を構成する。室内ユニット（30）の数量は、１つ又は２つ以上である。各室内ユニット（30）には、室内熱交換器（31）、室内膨張弁（32）、及び室内ファン（33）が設けられる。 The indoor unit (30) is provided near the ceiling of the room. The indoor unit (30) constitutes a convection type indoor unit that performs cooling or heating by the air conveyed by the indoor fan (33). The number of indoor units (30) is one or more. Each indoor unit (30) is provided with an indoor heat exchanger (31), an indoor expansion valve (32), and an indoor fan (33).
　輻射パネル（40）は、室内の床面に設置される。輻射パネル（40）は、輻射熱の移動により、冷房又は暖房を行う輻射型の室内機を構成する。輻射パネル（40）の数量は、１つ又は２つ以上である。 The radiation panel (40) is installed on the floor of the room. The radiation panel (40) constitutes a radiation type indoor unit that performs cooling or heating by the movement of radiant heat. The number of radiation panels (40) is one or more.
　空気調和装置（10）には、充填された冷媒が循環する冷媒回路（11）が構成される。冷媒回路（11）の詳細は後述する。 The air conditioner (10) is configured with a refrigerant circuit (11) in which the filled refrigerant circulates. Details of the refrigerant circuit (11) will be described later.
　〈輻射パネルの全体構成〉
　輻射パネル（40）の全体構成について図２を参照しながら説明する。輻射パネル（40）は、一対の支柱（41）と、パネル本体（52）（輻射熱交換器（52）ともいう）と、底板（42）とを備える。 Overall configuration of radiation panel
The entire configuration of the radiation panel (40) will be described with reference to FIG. The radiation panel (40) includes a pair of support columns (41), a panel body (52) (also referred to as a radiation heat exchanger (52)), and a bottom plate (42).
　支柱（41）は、輻射パネル（40）の左右側端に１つずつ設けられる。各支柱（41）は、床面上に立設し、上下方向に延びている。 The columns (41) are provided one each at the left and right ends of the radiation panel (40). Each support post (41) is erected on the floor surface and extends in the vertical direction.
　パネル本体（52）は、一対の支柱（41）の間に設けられる。パネル本体（52）は、その前面及び後面が室内空間に露出している。 The panel body (52) is provided between the pair of columns (41). The front and back surfaces of the panel body (52) are exposed to the indoor space.
　底板（42）は、一対の支柱（41）の下端に連結するように、該一対の支柱（41）の間を左右に延びている。底板（42）は、アンカーボルト等の締結部材（図示省略）を介して室内の床面に固定される。一対の支柱（41）の上端は、固定部（43）を介して天井側の吊りボルト（図示省略）と連結する。 The bottom plate (42) extends laterally between the pair of columns (41) so as to be connected to the lower ends of the pair of columns (41). The bottom plate (42) is fixed to the floor of the room via a fastening member (not shown) such as an anchor bolt. The upper ends of the pair of columns (41) are connected to a ceiling side suspension bolt (not shown) via a fixing portion (43).
　輻射パネル（40）では、パネル本体（52）の下側に下部収容室（44）が形成される。下部収容室（44）には、パネル本体（52）から発生した結露水を回収するためのドレンパン（45）が設けられる。下部収容室（44）の前側及び後側の各開放面は、下部カバー（46）によってそれぞれ覆われる。各下部カバー（46）は、例えば一対の支柱（41）の下部に着脱可能に取り付けられる。 In the radiation panel (40), a lower accommodation room (44) is formed below the panel body (52). The lower accommodation chamber (44) is provided with a drain pan (45) for recovering the dew condensation water generated from the panel body (52). The open front and rear sides of the lower accommodation chamber (44) are covered by the lower cover (46), respectively. Each lower cover (46) is removably attached, for example, to the lower part of a pair of support posts (41).
　輻射パネル（40）では、パネル本体（52）の上側に上部収容室（47）が形成される。上部収容室（47）には、冷媒配管の液管（53）及びガス管（54）が収容される。液管（53）には、輻射膨張弁（50）（図２において図示省略）が接続される。上部収容室（47）の前側及び後側の各開放面は、上部カバー（48）によってそれぞれ覆われる。各上部カバー（48）は、例えば一対の支柱（41）の上部に着脱可能に取り付けられる。 In the radiation panel (40), an upper storage chamber (47) is formed on the upper side of the panel body (52). A liquid pipe (53) and a gas pipe (54) of the refrigerant pipe are accommodated in the upper accommodation chamber (47). A radiation expansion valve (50) (not shown in FIG. 2) is connected to the liquid pipe (53). The open front and rear sides of the upper accommodation chamber (47) are covered by the upper cover (48), respectively. Each upper cover (48) is removably attached, for example, to the top of a pair of support posts (41).
　〈冷媒回路の詳細な構成〉
　冷媒回路（11）の構成について、図１及び図３を参照しながら詳細に説明する。冷媒回路（11）は、室外回路（12）、室内回路（13）、及び輻射回路（15）を含んでいる。室外回路（12）は、室外ユニット（20）に設けられ、室内回路（13）は室内ユニット（30）に設けられ、輻射回路（15）は輻射パネル（40）に設けられる。本実施形態では、室内ユニット（30）及び輻射パネル（40）が２本の連絡配管（16,17）を介して室外ユニット（20）に接続される。厳密には、室内回路（13）及び輻射回路（15）は、連絡配管としてのガス連絡配管（16）及び液連絡配管（17）を介して、室外回路（12）に接続される。 <Detailed Configuration of Refrigerant Circuit>
The configuration of the refrigerant circuit (11) will be described in detail with reference to FIGS. 1 and 3. The refrigerant circuit (11) includes an outdoor circuit (12), an indoor circuit (13), and a radiation circuit (15). The outdoor circuit (12) is provided in the outdoor unit (20), the indoor circuit (13) is provided in the indoor unit (30), and the radiation circuit (15) is provided in the radiation panel (40). In the present embodiment, the indoor unit (30) and the radiation panel (40) are connected to the outdoor unit (20) via the two connection pipes (16, 17). Strictly speaking, the indoor circuit (13) and the radiation circuit (15) are connected to the outdoor circuit (12) via a gas communication pipe (16) and a liquid communication pipe (17) as communication pipes.
　〈室外回路〉
　室外回路（12）には、圧縮機（21）、室外熱交換器（22）、室外膨張弁（23）、及び四方切換弁（24）が接続される。圧縮機（21）は、可変容量式に構成される。より詳細には、インバータ装置により、圧縮機（21）の運転周波数を制御することで、冷媒回路（11）の冷媒循環量を調節できる。室外熱交換器（22）の近傍には、室外空気を搬送する室外ファン（25）が設けられる。室外熱交換器（22）では、その内部を流れる冷媒と、室外ファン（25）が搬送する室外空気とが熱交換する。室外膨張弁（23）は、開度が可変な流量調節弁であり、例えば電子膨張弁で構成される。 <Outdoor circuit>
A compressor (21), an outdoor heat exchanger (22), an outdoor expansion valve (23), and a four-way switching valve (24) are connected to the outdoor circuit (12). The compressor (21) is configured as a variable displacement type. More specifically, the amount of refrigerant circulation in the refrigerant circuit (11) can be adjusted by controlling the operating frequency of the compressor (21) by the inverter device. In the vicinity of the outdoor heat exchanger (22), an outdoor fan (25) for conveying outdoor air is provided. In the outdoor heat exchanger (22), the refrigerant flowing inside thereof exchanges heat with the outdoor air conveyed by the outdoor fan (25). The outdoor expansion valve (23) is a flow control valve having a variable opening degree, and is formed of, for example, an electronic expansion valve.
　四方切換弁（24）は、暖房運転と冷房運転とを切り換えるための切換機構を構成している。具体的に、四方切換弁（24）は、第１状態（図１の実線で示す状態）と第２状態（図１の破線で示す状態）とに切換可能に構成される。四方切換弁（24）は、冷房運転において第１状態に切り換わる。第１状態の四方切換弁（24）は、圧縮機（21）の吐出側と室外熱交換器（22）のガス端部とを連通させると同時に、圧縮機（21）の吸入側とガス連絡配管（16）とを連通させる。四方切換弁（24）は、暖房運転において第２状態に切り換わる。第２状態の四方切換弁（24）は、圧縮機（21）の吐出側とガス連絡配管（16）とを連通させると同時に、圧縮機（21）の吸入側と室外熱交換器（22）のガス端部とを連通させる。 The four-way switching valve (24) constitutes a switching mechanism for switching between the heating operation and the cooling operation. Specifically, the four-way switching valve (24) is configured to be switchable between a first state (a state shown by a solid line in FIG. 1) and a second state (a state shown by a broken line in FIG. 1). The four-way switching valve (24) switches to the first state in the cooling operation. The four-way switching valve (24) in the first state communicates the discharge side of the compressor (21) with the gas end of the outdoor heat exchanger (22), and at the same time, makes gas communication with the suction side of the compressor (21). Bring the pipe (16) into communication. The four-way switching valve (24) switches to the second state in the heating operation. The four-way switching valve (24) in the second state brings the discharge side of the compressor (21) into communication with the gas communication pipe (16), and at the same time the suction side of the compressor (21) and the outdoor heat exchanger (22) Communicate with the end of the gas.
　室外回路（12）には、吐出圧力センサ（61）と吸入圧力センサ（62）とが設けられる。吐出圧力センサ（61）は、圧縮機（21）の吐出側に設けられる。吐出圧力センサ（61）は、圧縮機（21）の吐出冷媒の圧力（冷媒回路（11）の高圧圧力）を検出する。吸入圧力センサ（62）は、圧縮機（21）の吸入冷媒の圧力（冷媒回路（11）の低圧圧力）を検出する。 The outdoor circuit (12) is provided with a discharge pressure sensor (61) and a suction pressure sensor (62). The discharge pressure sensor (61) is provided on the discharge side of the compressor (21). The discharge pressure sensor (61) detects the pressure (the high pressure pressure of the refrigerant circuit (11)) of the refrigerant discharged from the compressor (21). The suction pressure sensor (62) detects the pressure of the suction refrigerant of the compressor (21) (the low pressure of the refrigerant circuit (11)).
　〈室内回路〉
　室内回路（13）の数量は、室内ユニット（30）の数量に対応している。室内回路（13）の一端（液端部）は、液連絡配管（17）に接続される。室内回路（13）の他端（ガス端部）は、ガス連絡配管（16）に接続される。室内回路（13）には、その液端部からそのガス端部に向かって順に、室内膨張弁（32）及び室内熱交換器（31）が接続される。室内膨張弁（32）は、開度が可変な流量調節弁（第１調節弁）であり、例えば電子膨張弁で構成される。室内熱交換器（31）の近傍には、室内空気を搬送する室内ファン（33）が設けられる。室内熱交換器（31）では、その内部を流れる冷媒と、室内ファン（33）が搬送する室内空気とが熱交換する。 <Indoor circuit>
The number of indoor circuits (13) corresponds to the number of indoor units (30). One end (liquid end) of the indoor circuit (13) is connected to the liquid communication pipe (17). The other end (gas end) of the indoor circuit (13) is connected to a gas communication pipe (16). The indoor expansion valve (32) and the indoor heat exchanger (31) are connected to the indoor circuit (13) in order from the liquid end to the gas end. The indoor expansion valve (32) is a flow control valve (first control valve) having a variable opening degree, and is formed of, for example, an electronic expansion valve. In the vicinity of the indoor heat exchanger (31), an indoor fan (33) for conveying indoor air is provided. In the indoor heat exchanger (31), the refrigerant flowing inside thereof exchanges heat with the indoor air conveyed by the indoor fan (33).
　室内回路（13）には、第１液側温度センサ（63）と、第１ガス側温度センサ（64）とが設けられる。第１液側温度センサ（63）は、室内熱交換器（31）の液側に設けられ、室内回路（13）を流れる液冷媒の温度を検出する。第１ガス側温度センサ（64）は、室内熱交換器（31）のガス側に設けられ、室内回路（13）を流れるガス冷媒の温度を検出する。 The indoor circuit (13) is provided with a first liquid side temperature sensor (63) and a first gas side temperature sensor (64). The first liquid side temperature sensor (63) is provided on the liquid side of the indoor heat exchanger (31), and detects the temperature of the liquid refrigerant flowing through the indoor circuit (13). The first gas side temperature sensor (64) is provided on the gas side of the indoor heat exchanger (31) and detects the temperature of the gas refrigerant flowing through the indoor circuit (13).
　〈輻射回路〉
　輻射回路（15）の数量は、輻射パネル（40）の数量に対応している。輻射回路（15）の一端（液端部）は、液連絡配管（17)に接続される。輻射回路（15）の他端（ガス端部）は、ガス連絡配管（16）に接続される。輻射回路（15）には、その液端部からガス端部に向かって順に、輻射膨張弁（51）及び輻射熱交換器（52）が接続される。輻射膨張弁（51）は、開度が可変な流量調節弁（第２調節弁）であり、例えば電子膨張弁で構成される。輻射熱交換器（52）の近傍には、空気を搬送するファンは設けられてない。つまり、輻射熱交換器（52）は、輻射熱の移動により、冷媒と室内空気とを熱交換させる。 Radiation circuit
The number of radiation circuits (15) corresponds to the number of radiation panels (40). One end (liquid end) of the radiation circuit (15) is connected to the liquid communication pipe (17). The other end (gas end) of the radiation circuit (15) is connected to a gas communication pipe (16). A radiation expansion valve (51) and a radiation heat exchanger (52) are connected to the radiation circuit (15) in order from the liquid end to the gas end. The radiation expansion valve (51) is a flow control valve (second control valve) having a variable opening degree, and is formed of, for example, an electronic expansion valve. In the vicinity of the radiant heat exchanger (52), a fan for conveying air is not provided. That is, the radiant heat exchanger (52) exchanges heat between the refrigerant and the indoor air by the transfer of radiant heat.
　輻射回路（15）には、第２液側温度センサ（65）と、第２ガス側温度センサ（66）とが設けられる。第２液側温度センサ（65）は、輻射熱交換器（52）の液側（液管（53））に設けられ、輻射回路（15）を流れる液冷媒の温度を検出する。第２ガス側温度センサ（66）は、輻射熱交換器（52）のガス側（ガス管（54））に設けられ、輻射回路（15）を流れるガス冷媒の温度を検出する。 The radiation circuit (15) is provided with a second liquid side temperature sensor (65) and a second gas side temperature sensor (66). The second liquid side temperature sensor (65) is provided on the liquid side (liquid pipe (53)) of the radiant heat exchanger (52), and detects the temperature of the liquid refrigerant flowing through the radiation circuit (15). The second gas side temperature sensor (66) is provided on the gas side (gas pipe (54)) of the radiant heat exchanger (52), and detects the temperature of the gas refrigerant flowing through the radiation circuit (15).
　ガス管（54）は、ガス連絡配管（16）から分岐している。本実施形態のガス管（54）の内径は、ガス連絡配管（16）の内径よりも小さい。例えばガス管（54）は、いわゆる３分配管（３／８インチの口径を有する配管）で構成され、ガス連絡配管（16）は、いわゆる４分配管（４／８インチの口径を有する配管）で構成される。このため、ガス連絡配管（16）とガス管（54）とは、異径継手（図示省略）を介して互いに接続される。 The gas pipe (54) branches from the gas communication pipe (16). The inner diameter of the gas pipe (54) of the present embodiment is smaller than the inner diameter of the gas communication pipe (16). For example, the gas pipe (54) is constituted by a so-called three-minute pipe (a pipe having a 3/8 inch diameter), and the gas connection pipe (16) is a so-called four-minute pipe (a piping having a 4/8 inch diameter) It consists of For this reason, the gas communication pipe (16) and the gas pipe (54) are connected to each other via a different diameter joint (not shown).
　〈リモートコントローラ〉
　図３に示すように、空気調和装置（10）には、該空気調和装置（10）を操作するためのリモートコントローラ（70）が設けられる。リモートコントローラ（70）には、液晶モニタ等の表示部、操作用のボタン等が設けられる。リモートコントローラ（70）では、室内の設定温度Ｔsが設定可能である。また、本実施形態のリモートコントローラ（70）には、室内温度Ｔrを検出する室内温度センサ（71）が設けられる。 <Remote controller>
As shown in FIG. 3, the air conditioner (10) is provided with a remote controller (70) for operating the air conditioner (10). The remote controller (70) is provided with a display unit such as a liquid crystal monitor, operation buttons, and the like. The remote control (70) can set the indoor set temperature Ts. Further, the remote controller (70) of the present embodiment is provided with an indoor temperature sensor (71) for detecting the indoor temperature Tr.
　リモートコントローラ（70）は、輻射パネル（40）の近傍に配置するのが好ましい。図３の例では、リモートコントローラ（70）は、他の室内ユニット（30）よりも輻射パネル（40）に近い位置に配置される。 The remote controller (70) is preferably arranged in the vicinity of the radiation panel (40). In the example of FIG. 3, the remote controller (70) is disposed closer to the radiation panel (40) than the other indoor units (30).
　〈室内コントローラ及び輻射コントローラ〉
　図１及び図３に示すように、本実施形態の室内ユニット（30）には、室内コントローラ（34）が設けられ、輻射パネル（40）には、輻射コントローラ（55）（制御部）が設けられる。室内コントローラ（C1）及び輻射コントローラ（C2）のそれぞれは、マイクロコンピュータと、該マイクロコンピュータを動作させるためのソフトウエアを格納するメモリディバイス（具体的には半導体メモリ）とを用いて構成されている。室内コントローラ（C1）及び輻射コントローラ（C2）では、各種のセンサの検出信号や、制御信号等が入出力可能である。 <Indoor controller and radiation controller>
As shown in FIGS. 1 and 3, the indoor unit (30) of the present embodiment is provided with an indoor controller (34), and the radiation panel (40) is provided with a radiation controller (55) (control unit). Be Each of the indoor controller (C1) and the radiation controller (C2) is configured by using a microcomputer and a memory device (specifically, a semiconductor memory) storing software for operating the microcomputer. . The indoor controller (C1) and the radiation controller (C2) can input and output detection signals of various sensors, control signals, and the like.
　室内コントローラ（C1）は、室内ユニット（30）の発停（いわゆるサーモオン／サーモオフ）を制御する。より詳細には、室内コントローラ（C1）は、室内空気の温度Ｔｒが、設定温度Ｔｓに基づく所定値に至ると、室内ユニット（30）を停止（サーモオフ）させる。 The indoor controller (C1) controls the start / stop (so-called thermo on / thermo off) of the indoor unit (30). More specifically, the indoor controller (C1) stops (thermo-off) the indoor unit (30) when the temperature Tr of the indoor air reaches a predetermined value based on the set temperature Ts.
　室内コントローラ（C1）は、冷房運転において、室内膨張弁（32）の開度を、いわゆる過熱度制御する。具体的には、冷房運転では、室内熱交換器（31）で蒸発した後の冷媒の過熱度ＳＨ１が目標過熱度に近づくように、室内膨張弁（32）の開度が調節される。ここで、過熱度ＳＨ１は、例えば第１ガス側温度センサ（64）で検出した冷媒の温度と、吸入圧力センサ（62）で検出した低圧圧力に対応する飽和温度との差によって求められる。 The indoor controller (C1) controls the opening degree of the indoor expansion valve (32) in a so-called superheat degree in the cooling operation. Specifically, in the cooling operation, the opening degree of the indoor expansion valve (32) is adjusted such that the degree of superheat SH1 of the refrigerant after evaporation in the indoor heat exchanger (31) approaches the target degree of superheat. Here, the degree of superheat SH1 is determined, for example, by the difference between the temperature of the refrigerant detected by the first gas side temperature sensor (64) and the saturation temperature corresponding to the low pressure detected by the suction pressure sensor (62).
　室内コントローラ（C1）は、暖房運転において、室内膨張弁（32）の開度を、いわゆる過冷却度制御する。具体的には、暖房運転では、室内熱交換器（31）で凝縮した後の冷媒の過冷却度ＳＣ１が目標過冷却度に近づくように、室内膨張弁（32）の開度が調節される。ここで、過冷却度ＳＣ１は、例えば第１液側温度センサ（63）で検出した冷媒の温度と、吐出圧力センサ（61）で検出した高圧圧力に対応する飽和温度との差によって求められる。 The indoor controller (C1) controls the degree of opening of the indoor expansion valve (32) in so-called supercooling in the heating operation. Specifically, in the heating operation, the degree of opening of the indoor expansion valve (32) is adjusted such that the degree of subcooling SC1 of the refrigerant after condensation in the indoor heat exchanger (31) approaches the target degree of subcooling . Here, the degree of subcooling SC1 is determined, for example, by the difference between the temperature of the refrigerant detected by the first liquid side temperature sensor (63) and the saturation temperature corresponding to the high pressure detected by the discharge pressure sensor (61).
　輻射コントローラ（C2）は、輻射膨張弁（51）を制御することで、輻射パネル（40）の発停（いわゆるサーモオン／サーモオフ）を制御する。本実施形態の輻射コントローラ（C2）は、予め設定された室内ユニット（30）に連動してサーモオン／サーモオフを切り換える、いわゆるグループ制御を行う。この制御の詳細は後述する。 The radiation controller (C2) controls the radiation expansion valve (51) to control start / stop of the radiation panel (40) (so-called thermo on / thermo off). The radiation controller (C2) of the present embodiment performs so-called group control in which thermo-on / thermo-off is switched in conjunction with a previously set indoor unit (30). Details of this control will be described later.
　輻射コントローラ（C2）は、冷房運転において、輻射膨張弁（51）の開度を、いわゆる過熱度制御する。具体的には、暖房運転では、輻射熱交換器（52）で蒸発した後の冷媒の過熱度ＳＨ２が目標過熱度に近づくように、輻射膨張弁（51）の開度が調節される。ここで、過熱度ＳＨ２は、例えば第２ガス側温度センサ（66）で検出した冷媒の温度と、吸入圧力センサ（61）で検出した低圧圧力に対応する飽和温度との差によって求められる。 The radiation controller (C2) controls the opening degree of the radiation expansion valve (51) in a so-called superheat degree in the cooling operation. Specifically, in the heating operation, the opening degree of the radiation expansion valve (51) is adjusted so that the degree of superheat SH2 of the refrigerant after evaporation in the radiant heat exchanger (52) approaches the target degree of superheat. Here, the degree of superheat SH2 is determined, for example, by the difference between the temperature of the refrigerant detected by the second gas side temperature sensor (66) and the saturation temperature corresponding to the low pressure detected by the suction pressure sensor (61).
　輻射コントローラ（C2）は、暖房運転において、輻射膨張弁（51）の開度を、いわゆる過冷却度制御する。具体的には、暖房運転では、輻射熱交換器（52）で凝縮した後の冷媒の過冷却度ＳＣ２が目標過冷却度に近づくように、輻射膨張弁（51）の開度が調節される。ここで、過冷却度ＳＣ２は、例えば第２液側温度センサ（65）で検出した冷媒の温度と、吐出圧力センサ（61）で検出した高圧圧力に対応する飽和温度との差によって求められる。 The radiation controller (C2) controls the degree of opening of the radiation expansion valve (51) in so-called supercooling in the heating operation. Specifically, in the heating operation, the degree of opening of the radiation expansion valve (51) is adjusted such that the degree of subcooling SC2 of the refrigerant after condensation in the radiant heat exchanger (52) approaches the target degree of subcooling. Here, the degree of subcooling SC2 is determined, for example, by the difference between the temperature of the refrigerant detected by the second liquid side temperature sensor (65) and the saturation temperature corresponding to the high pressure detected by the discharge pressure sensor (61).
　－運転動作－
　実施形態１に係る空気調和装置（10）の運転動作について図１を参照しながら説明する。空気調和装置（10）は、冷房運転と暖房運転とを切り換えて行う。 -Driving operation-
The operation of the air conditioner (10) according to the first embodiment will be described with reference to FIG. The air conditioner (10) switches between cooling operation and heating operation.
　〈冷房運転〉
　冷房運転では、圧縮機（21）、室外ファン（25）、及び室内ファン（33）が運転される。四方切換弁（24）が第１状態となる。室外膨張弁（23）は所定開度（例えば全開）に開放される。室内膨張弁（32）及び輻射膨張弁（51）の開度が、過熱度制御される。冷房運転では、室外熱交換器（22）で凝縮・放熱した冷媒が、室内熱交換器（31）及び輻射熱交換器（52）で蒸発する冷凍サイクルが行われる。 <Cooling operation>
In the cooling operation, the compressor (21), the outdoor fan (25), and the indoor fan (33) are operated. The four-way switching valve (24) is in the first state. The outdoor expansion valve (23) is opened at a predetermined opening (for example, fully open). The degree of superheat of the opening degree of the indoor expansion valve (32) and the radiation expansion valve (51) is controlled. In the cooling operation, a refrigeration cycle is performed in which the refrigerant condensed and radiated by the outdoor heat exchanger (22) is evaporated by the indoor heat exchanger (31) and the radiant heat exchanger (52).
　具体的に、圧縮機（21）で圧縮された冷媒は、室外熱交換器（22）を流れる。室外熱交換器（22）では、冷媒が室外空気へ放熱して凝縮する。室外熱交換器（22）で凝縮した冷媒は、室外膨張弁（23）を通過した後、液連絡配管（17）を流れる。液連絡配管（17）を流れる冷媒は、室内回路（13）と輻射回路（15）とに分流する。 Specifically, the refrigerant compressed by the compressor (21) flows through the outdoor heat exchanger (22). In the outdoor heat exchanger (22), the refrigerant releases heat to the outdoor air and condenses. The refrigerant condensed by the outdoor heat exchanger (22) passes through the outdoor expansion valve (23) and then flows through the liquid communication pipe (17). The refrigerant flowing through the liquid communication pipe (17) is branched into the indoor circuit (13) and the radiation circuit (15).
　室内回路（13）に流入した冷媒は、室内膨張弁（32）で減圧された後、室内熱交換器（31）を流れる。室内熱交換器（31）では、冷媒が、室内ファン（33）の搬送する空気から吸熱し、蒸発する。室内熱交換器（31）で蒸発した冷媒は、ガス連絡配管（16）へ流出する。 The refrigerant flowing into the indoor circuit (13) flows through the indoor heat exchanger (31) after being depressurized by the indoor expansion valve (32). In the indoor heat exchanger (31), the refrigerant absorbs heat from the air conveyed by the indoor fan (33) and evaporates. The refrigerant evaporated in the indoor heat exchanger (31) flows out to the gas connection pipe (16).
　輻射回路（15）に流入した冷媒は、輻射膨張弁（51）で減圧された後、輻射熱交換器（52）を流れる。輻射熱交換器（52）では、冷媒が、輻射パネル（40）の周囲の室内空気から吸熱し、蒸発する。輻射熱交換器（52）で蒸発した冷媒は、ガス連絡配管（16）へ流出する。 The refrigerant flowing into the radiation circuit (15) is reduced in pressure by the radiation expansion valve (51) and then flows through the radiation heat exchanger (52). In the radiant heat exchanger (52), the refrigerant absorbs heat from room air around the radiation panel (40) and evaporates. The refrigerant evaporated in the radiant heat exchanger (52) flows out to the gas connection pipe (16).
　ガス連絡配管（16）で合流した冷媒は、圧縮機（21）に吸入されて再び圧縮される。 The refrigerant merged in the gas communication pipe (16) is sucked into the compressor (21) and compressed again.
　〈暖房運転〉
　暖房運転では、圧縮機（21）、室外ファン（25）、及び室内ファン（33）が運転される。四方切換弁（24）が第２状態となる。室外膨張弁（23）は過熱度制御される。室内膨張弁（32）及び輻射パネル（40）の開度が、過冷却度制御される。暖房運転では、室内熱交換器（31）及び輻射熱交換器（52）でそれぞれ凝縮・放熱した冷媒が、室外熱交換器（22）で蒸発する冷凍サイクルが行われる。 <Heating operation>
In the heating operation, the compressor (21), the outdoor fan (25), and the indoor fan (33) are operated. The four-way switching valve (24) is in the second state. The outdoor expansion valve (23) is superheated controlled. The degree of opening of the indoor expansion valve (32) and the radiation panel (40) is subcooled. In the heating operation, a refrigeration cycle is performed in which the refrigerant condensed and radiated by the indoor heat exchanger (31) and the radiant heat exchanger (52) is evaporated by the outdoor heat exchanger (22).
　具体的に、圧縮機（21）で圧縮された冷媒は、ガス連絡配管（16）を流れ、室外回路（12）と輻射回路（15）とに分流する。 Specifically, the refrigerant compressed by the compressor (21) flows through the gas connection pipe (16) and is branched into the outdoor circuit (12) and the radiation circuit (15).
　室内回路（13）に流入した冷媒は、室内熱交換器（31）を流れる。室内熱交換器（31）では、冷媒が、室内ファン（33）の搬送する空気へ放熱し、凝縮する。室内熱交換器（31）で凝縮した冷媒は、室内膨張弁（32）を通過した後、液連絡配管（17）へ流出する。 The refrigerant flowing into the indoor circuit (13) flows through the indoor heat exchanger (31). In the indoor heat exchanger (31), the refrigerant releases heat to the air conveyed by the indoor fan (33) and condenses. The refrigerant condensed by the indoor heat exchanger (31) passes through the indoor expansion valve (32) and then flows out to the liquid communication pipe (17).
　輻射回路（15）に流入した冷媒は、輻射熱交換器（52）を流れる。輻射熱交換器（52）では、冷媒が、輻射パネル（40）の周囲の室内空気へ放熱し、凝縮する。輻射熱交換器（52）で凝縮した冷媒は、輻射膨張弁（51）を通過した後、液連絡配管（17）へ流出する。 The refrigerant flowing into the radiation circuit (15) flows through the radiant heat exchanger (52). In the radiant heat exchanger (52), the refrigerant releases heat to room air around the radiation panel (40) and condenses. The refrigerant condensed by the radiant heat exchanger (52) flows out to the liquid communication pipe (17) after passing through the radiant expansion valve (51).
　液連絡配管（17）で合流した冷媒は、室外回路（12）へ流入し、室外膨張弁（23）で減圧された後、室外熱交換器（22）を流れる。室外熱交換器（22）では、冷媒が室外空気から吸熱して蒸発する。室外熱交換器（22）で蒸発した冷媒は、圧縮機（21）に吸入されて再び圧縮される。 The refrigerant joined in the liquid communication pipe (17) flows into the outdoor circuit (12), is decompressed by the outdoor expansion valve (23), and then flows through the outdoor heat exchanger (22). In the outdoor heat exchanger (22), the refrigerant absorbs heat from the outdoor air and evaporates. The refrigerant evaporated in the outdoor heat exchanger (22) is sucked into the compressor (21) and compressed again.
　〈グループ制御〉
　上述した冷房運転や暖房運転では、輻射パネル（40）のサーモオン／サーモオフの切り換えが、所定の室内ユニット（30）と連動して行われる、グループ制御が行われる。このグループ制御について、図３を参照しながら説明する。 <Group control>
In the cooling operation and the heating operation described above, group control is performed in which switching of the heat on / heat off of the radiation panel (40) is performed in conjunction with a predetermined indoor unit (30). This group control will be described with reference to FIG.
　図３の例では、例えば第２室内ユニット（30B）と、輻射パネル（40）とが同じグループに設定される。このため、輻射パネル（40）は、第２室内ユニット（30B）と連動するようにサーモオン／サーモオフが切り換えられる。一方、第２室内ユニット（30B）は、リモートコントローラ（70）の室内温度センサ（71）で検出した室内温度Ｔｒに基づいて、サーモオン／サーモオフが切り換えられる。 In the example of FIG. 3, for example, the second indoor unit (30B) and the radiation panel (40) are set in the same group. For this reason, the radiation panel (40) is switched between thermo on / thermo off so as to interlock with the second indoor unit (30B). On the other hand, in the second indoor unit (30B), the thermo on / thermo off is switched based on the indoor temperature Tr detected by the indoor temperature sensor (71) of the remote controller (70).
　第２室内ユニット（30B）の室内コントローラ（C1）には、室内温度センサ（71）で検出した室内温度Ｔｒが適宜入力される。例えば暖房運転において、この室内温度Ｔｒが所定値に至ったとする。この場合、室内コントローラ（C1）は、第２室内ユニット（30B）をサーモオフさせる。これに伴い、例えば第２室内ユニット（30B）の室内コントローラ（C1）から、輻射コントローラ（C2）に制御信号が出力される。この制御信号は、輻射パネル（40）をサーモオフさせるための制御信号である。従って、この制御信号を受けた輻射コントローラ（C2）は、輻射パネル（40）をサーモオフさせる。この結果、輻射パネル（40）は、第２室内ユニット（30B）のサーモオフとほぼ同じ、あるいは若干遅れたタイミングでサーモオフする。 The indoor temperature Tr detected by the indoor temperature sensor (71) is appropriately input to the indoor controller (C1) of the second indoor unit (30B). For example, it is assumed that the room temperature Tr reaches a predetermined value in the heating operation. In this case, the indoor controller (C1) turns off the second indoor unit (30B). Along with this, for example, the indoor controller (C1) of the second indoor unit (30B) outputs a control signal to the radiation controller (C2). This control signal is a control signal for thermo-off of the radiation panel (40). Therefore, the radiation controller (C2) that received this control signal causes the radiation panel (40) to heat off. As a result, the radiation panel (40) performs the thermo-off at a timing substantially the same as or slightly delayed from the thermo-off of the second indoor unit (30B).
　その後、室内温度Ｔｒが所定値を上回ると、第２室内ユニット（30B）が再びサーモオンする。これに伴い第２室内ユニット（30B）の室内コントローラ（C1）から、輻射コントローラ（C2）に制御信号が出力される。この制御信号は、輻射パネル（40）をサーモオンさせるための制御信号である。従って、この制御信号を受けた輻射コントローラ（C2）は、輻射パネル（40）をサーモオンさせる。この結果、輻射パネル（40）は、第２室内ユニット（30B）のサーモオンとほぼ同じ、あるいは若干遅れたタイミングでサーモオンする。 Thereafter, when the room temperature Tr exceeds a predetermined value, the second indoor unit (30B) is again turned on. Along with this, a control signal is output from the indoor controller (C1) of the second indoor unit (30B) to the radiation controller (C2). This control signal is a control signal for causing the radiation panel (40) to heat on. Therefore, the radiation controller (C2) receiving this control signal causes the radiation panel (40) to heat on. As a result, the radiation panel (40) performs thermo-on substantially at the same time as or slightly later than the thermo-on of the second indoor unit (30B).
　以上のグループ制御を行うことで、輻射パネル（40）のサーモオン／オフの制御を容易に実行できる。しかも、輻射パネル（40）に専用の室内温度センサを設ける必要もない。従って、空気調和装置（10）の構成及び制御の簡素化を図ることができる。 By performing the above group control, it is possible to easily execute the control of the heat on / off of the radiation panel (40). Moreover, it is not necessary to provide the radiation panel (40) with a dedicated room temperature sensor. Therefore, the configuration and control of the air conditioner (10) can be simplified.
　本実施形態では、リモートコントローラ（70）（厳密には、室内温度センサ（71））を第２室内ユニット（30B）よりも輻射パネル（40）の近くに配置している。このため、例えば暖房運転において、輻射パネル（40）の発停の頻度を抑えつつ、輻射パネル（40）の周囲の空気を確実に温めることができる。この点について詳述する。 In the present embodiment, the remote controller (70) (strictly, the indoor temperature sensor (71)) is disposed closer to the radiation panel (40) than the second indoor unit (30B). Therefore, for example, in the heating operation, it is possible to reliably warm the air around the radiation panel (40) while suppressing the frequency of start / stop of the radiation panel (40). This point will be described in detail.
　例えばリモートコントローラ（70）を輻射パネル（40）よりも第２室内ユニット（30B）の近くに配置したとする。この場合、例えば暖房運転では、輻射パネル（40）の周囲の空気は十分に暖まっていないにも拘わらず、第２室内ユニット（30B）がサーモオフすることがある。これは、第２室内ユニット（30B）の暖房能力は、輻射パネル（40）の暖房能力よりも高いことや、天井側に暖気が集まりやすいことに起因する。このようにして、第２室内ユニット（30B）がサーモオフすると、輻射パネル（40）も連動してサーモオフするため、より在室者に近い輻射パネル（40）の周囲の快適性が損なわれてしまう。また、第２室内ユニット（30B）や輻射パネル（40）の発停回数も増えてしまう可能性がある。 For example, it is assumed that the remote controller (70) is disposed closer to the second indoor unit (30B) than the radiation panel (40). In this case, for example, in the heating operation, the second indoor unit (30B) may be thermo-off even though the air around the radiation panel (40) is not sufficiently warmed up. This is attributed to the fact that the heating capacity of the second indoor unit (30B) is higher than the heating capacity of the radiation panel (40) and that warm air tends to gather on the ceiling side. In this way, when the second indoor unit (30B) is thermo-off, the radiation panel (40) is also interlocked and the thermo-off, so the comfort around the radiation panel (40) closer to the occupants is impaired. . In addition, the number of times of starting and stopping of the second indoor unit (30B) and the radiation panel (40) may also increase.
　これに対し、本実施形態では、室内温度センサ（71）が輻射パネル（40）の近傍に配置されるため、輻射パネル（40）の周囲の空気が十分に暖められるまで、第２室内ユニット（30B）及び輻射パネル（40）はサーモオフしない。このため、輻射パネル（40）の周囲の快適性が損なわれることを回避できるとともに、第２室内ユニット（30B）や輻射パネル（40）の発停回数を減らすことができる。これは、冷房運転においても同様である。 On the other hand, in the present embodiment, since the indoor temperature sensor (71) is disposed in the vicinity of the radiation panel (40), the second indoor unit (until the air around the radiation panel (40) is sufficiently warmed 30B) and the radiation panel (40) do not heat off. For this reason, it is possible to avoid the loss of comfort around the radiation panel (40), and to reduce the number of start / stop times of the second indoor unit (30B) and the radiation panel (40). The same applies to the cooling operation.
　なお、本実施形態では、室内ユニット（30）が天井設置式（厳密には、天井吊り下げ式や、天井埋め込み式）で構成されるが、この室内ユニット（30）を室内の床面に設置される床置き式としてもよい。この場合、室内ユニット（30）と輻射パネル（40）の距離が近づくため、室内ユニット（30）と輻射パネル（40）の周囲温度も近づく。このようにすると、上述のように室内ユニット（30）と輻射パネル（40）とで室内温度センサ（71）を共用した場合に、室内ユニット（30）と輻射パネル（40）の双方の周囲の温度を目標温度に収束させ易くなる。この結果、在室者の快適性を更に向上できる。 In the present embodiment, the indoor unit (30) is configured with a ceiling-mounted type (strictly, a ceiling-hanging type or a ceiling-embedded type), but this indoor unit (30) is installed on the floor of the room It is good also as a floor-standing type. In this case, since the distance between the indoor unit (30) and the radiation panel (40) approaches, the ambient temperature of the indoor unit (30) and the radiation panel (40) also approaches. In this case, when the indoor unit (30) and the radiation panel (40) share the indoor temperature sensor (71) as described above, the surroundings of both the indoor unit (30) and the radiation panel (40) It is easy to make the temperature converge to the target temperature. As a result, the comfort of the occupant can be further improved.
　－実施形態１の効果－
　上記実施形態では、室内熱交換器（31）及び室内膨張弁（32）が接続される室内回路（13）と、輻射熱交換器（52）及び輻射膨張弁（51）が接続される輻射回路（15）とが並列に設けられる。このため、上述した冷房運転や暖房運転では、輻射熱交換器（52）及び室内熱交換器（31）を流れる冷媒の流量をそれぞれ個別に調節できる。 -Effect of Embodiment 1-
In the above embodiment, the indoor circuit (13) to which the indoor heat exchanger (31) and the indoor expansion valve (32) are connected, and the radiation circuit to which the radiant heat exchanger (52) and the radiant expansion valve (51) are connected 15) are provided in parallel. For this reason, in the cooling operation and the heating operation described above, the flow rates of the refrigerant flowing through the radiant heat exchanger (52) and the indoor heat exchanger (31) can be individually adjusted.
　このように冷媒を輻射熱交換器（52）及び室内熱交換器（31）へ並列に流すようにすると、輻射熱交換器（52）の能力の調節幅、及び室内熱交換器（31）の能力の調節幅は、直列に流す場合と比較して大きくなる。特に、輻射熱交換器（52）の能力の下限値を比較的小さくできる。これにより、例えば比較的低能力の輻射熱交換器（52）を空気調和装置（10）に適用できる。 Thus, when the refrigerant is allowed to flow in parallel to the radiant heat exchanger (52) and the indoor heat exchanger (31), the adjustment range of the capacity of the radiant heat exchanger (52) and the capacity of the indoor heat exchanger (31) The adjustment range is larger than in the case of flowing in series. In particular, the lower limit of the capacity of the radiant heat exchanger (52) can be made relatively small. Thereby, for example, a relatively low capacity radiant heat exchanger (52) can be applied to the air conditioner (10).
　上記実施形態では、室内回路（13）を室内ユニット（30）に設け、輻射回路（15）を輻射パネル（40）に設けるとともに、室内ユニット（30）及び輻射パネル（40）を冷媒回路（11）に並列に接続している。従って、室内ユニット（30）及び輻射パネル（40）の各能力をそれぞれ個別に制御できる。 In the above embodiment, the indoor circuit (13) is provided in the indoor unit (30), the radiation circuit (15) is provided in the radiation panel (40), and the indoor unit (30) and the radiation panel (40) are provided in the refrigerant circuit (11). Connected in parallel). Therefore, each capability of the indoor unit (30) and the radiation panel (40) can be individually controlled.
　上記実施形態では、輻射回路（15）のガス管（54）の内径をガス連絡配管（16）の内径をよりも小さくしている。輻射パネル（40）は室内ユニット（30）と比べると、能力が小さくなる傾向にあるため、輻射パネル（40）に送られる冷媒の流量は、室内ユニット（30）に送られる冷媒の流量よりも少なくなる。このため、ガス管（54）の内径が大きすぎると、ガス管（54）を流れる冷媒の流速が過剰に小さくなる。この結果、例えば冷凍機油がガス管（54）の内部に残留しやすくなる。これに対し、ガス管（54）の内径をガス連絡配管（16）の内径よりも小さくすることで、ガス管（54）を流れる冷媒の流速を増大できる。この結果、ガス管（54）に冷凍機油が残存してしまうことを抑制できる。 In the above embodiment, the inner diameter of the gas pipe (54) of the radiation circuit (15) is smaller than the inner diameter of the gas connection pipe (16). Since the radiation panel (40) tends to have a smaller capacity than the indoor unit (30), the flow rate of the refrigerant sent to the radiation panel (40) is higher than the flow rate of the refrigerant sent to the indoor unit (30) Less. Therefore, when the inner diameter of the gas pipe (54) is too large, the flow velocity of the refrigerant flowing through the gas pipe (54) becomes excessively small. As a result, for example, refrigeration oil tends to remain inside the gas pipe (54). On the other hand, by making the inner diameter of the gas pipe (54) smaller than the inner diameter of the gas connection pipe (16), it is possible to increase the flow velocity of the refrigerant flowing through the gas pipe (54). As a result, residual refrigeration oil can be suppressed in the gas pipe (54).
　上記実施形態では、暖房運転において、室内熱交換器（31）と輻射熱交換器（52）の双方を放熱器とし、これらに冷媒を並列に流す冷凍サイクルが行われる。このため、暖房運転では、室内ユニット（30）の暖房能力と、輻射パネル（40）の暖房能力をそれぞれ個別に調節できる。 In the above embodiment, in the heating operation, both the indoor heat exchanger (31) and the radiant heat exchanger (52) are used as radiators, and a refrigeration cycle is performed in which the refrigerant flows in parallel to these. Therefore, in the heating operation, the heating capacity of the indoor unit (30) and the heating capacity of the radiation panel (40) can be adjusted individually.
　上記実施形態では、冷房運転において、室内熱交換器（31）と輻射熱交換器（52）の双方を蒸発器とし、これらに冷媒を並列に流す冷凍サイクルが行われる。このため、冷房運転では、室内ユニット（30）の冷房能力と、輻射パネル（40）の冷房能力をそれぞれ個別に調節できる。 In the above embodiment, in the cooling operation, both the indoor heat exchanger (31) and the radiant heat exchanger (52) are used as evaporators, and a refrigeration cycle is performed in which the refrigerant flows in parallel to these. Therefore, in the cooling operation, the cooling capacity of the indoor unit (30) and the cooling capacity of the radiation panel (40) can be adjusted individually.
　室内回路（13）と輻射回路（15）とを並列に接続する構成では、輻射膨張弁（51）及び室内膨張弁（32）のうち輻射膨張弁（51）だけを閉状態とすると、室内ユニット（30）のみでの冷房動作や暖房動作を実行できる。また、輻射膨張弁（51）及び室内膨張弁（32）のうち室内膨張弁（32）だけを閉状態とすると、輻射パネル（40）のみの冷房動作や暖房動作を実行できる。このように、空気調和装置（10）では、室内ユニット（30）及び輻射パネル（40）の双方を作動させる運転と、室内ユニット（30）のみ作動させる運転と、輻射パネル（40）のみ作動させる運転とを容易に切り換えるができる。 In the configuration in which the indoor circuit (13) and the radiation circuit (15) are connected in parallel, when only the radiation expansion valve (51) of the radiation expansion valve (51) and the indoor expansion valve (32) is closed, the indoor unit The cooling operation and the heating operation can be executed only by (30). Further, when only the indoor expansion valve (32) of the radiation expansion valve (51) and the indoor expansion valve (32) is closed, the cooling operation and the heating operation of only the radiation panel (40) can be performed. As described above, in the air conditioner (10), the operation for operating both the indoor unit (30) and the radiation panel (40), the operation for operating only the indoor unit (30), and the operation only for the radiation panel (40) It can be easily switched to driving.
　上記実施形態において、空気調和装置（10）の全体としての定格の冷房能力は、７．１ｋＷ以上であることが好ましい。また、室内ユニット（30）及び輻射パネル（40）の定格能力の合計が、室外ユニット（20）の定格能力の５０％以上２００％以下であることが好ましい。ここでいう「定格能力」は、冷房運転の能力（冷房能力）、及び暖房運転の能力（暖房能力）のうちの大きい方の能力を意味する。従って、例えば空気調和装置（10）では、冷房能力が暖房能力よりも大きい場合、冷房運転における室内ユニット（30）及び輻射パネル（40）の定格の冷房能力の合計が、冷房運転における室外ユニット（20）の定格能力の５０％以上２００％以下であればよい。また、例えば空気調和装置（10）では、暖房能力が冷房能力おりも大きい場合、暖房能力における室内ユニット（30）及び輻射パネル（40）の定格の暖房能力の合計が、暖房運転における室外ユニット（20）の定格能力の５０％以上２００％以下であればよい。空気調和装置（10）の能力をこのように設定することで、ビル用マルチ式の空気調和装置のクラスにおいて、室内ユニット（30）及び輻射パネル（40）を並列に接続した構成を採用できる。 In the said embodiment, it is preferable that the cooling capacity of the rating as the whole of an air conditioning apparatus (10) is 7.1 kW or more. Moreover, it is preferable that the sum total of the rated capacity of the indoor unit (30) and the radiation panel (40) is 50% or more and 200% or less of the rated capacity of the outdoor unit (20). The "rated capacity" as used herein means the larger one of the capacity for cooling operation (cooling capacity) and the capacity for heating operation (heating capacity). Therefore, for example, in the air conditioner (10), when the cooling capacity is larger than the heating capacity, the total of the rated cooling capacities of the indoor unit (30) and the radiation panel (40) in the cooling operation is the outdoor unit in the cooling operation. 50% or more and 200% or less of the rated capacity of 20). Also, for example, in the air conditioning apparatus (10), when the heating capacity is large or the cooling capacity is large, the total of the rated heating capacities of the indoor unit (30) and the radiation panel (40) in the heating capacity is the outdoor unit in the heating operation. 50% or more and 200% or less of the rated capacity of 20). By setting the capacity of the air conditioner (10) in this manner, it is possible to adopt a configuration in which the indoor unit (30) and the radiation panel (40) are connected in parallel in the multi-type air conditioner for buildings.
　上記実施形態では、冷房運転において、輻射膨張弁（51）の開度を過熱度制御している。このため、輻射熱交換器（52）の冷房能力を最適に調節できるとともに、圧縮機（21）の液圧縮を回避できる。 In the above embodiment, the degree of superheat of the opening degree of the radiation expansion valve (51) is controlled in the cooling operation. Therefore, the cooling capacity of the radiant heat exchanger (52) can be optimally adjusted, and the liquid compression of the compressor (21) can be avoided.
　上記実施形態では、暖房運転において、輻射膨張弁（51）の開度を過冷却度制御している。このため、輻射熱交換器（52）の暖房能力を最適に調節できる。 In the above embodiment, the degree of supercooling of the opening degree of the radiation expansion valve (51) is controlled in the heating operation. Thus, the heating capacity of the radiant heat exchanger (52) can be optimally adjusted.
　《実施形態２》
　実施形態２に係る空気調和装置（10）は、上記実施形態１と冷媒回路（11）の構成が異なる。実施形態２に係る空気調和装置（10）は、実施形態１の冷房運転、及び暖房運転に加えて、冷暖同時運転（詳細は後述する）を実行可能に構成される。以下には、主として上記実施形態１と異なる点を説明する。 << Embodiment 2 >>
The air conditioner (10) according to the second embodiment differs from the first embodiment in the configuration of the refrigerant circuit (11). The air conditioning apparatus (10) according to the second embodiment is configured to be able to execute simultaneous cooling and heating operation (details will be described later) in addition to the cooling operation and the heating operation of the first embodiment. The differences from the first embodiment will be mainly described below.
　〈冷媒回路の構成〉
　図４に示すように、実施形態１の冷媒回路（11）には、３本の連絡配管（16,17）が設けられる。具体的に、冷媒回路（11）には、第１ガス連絡配管（16A）、第２ガス連絡配管（16B）、及び液連絡配管（17）が接続される。つまり、空気調和装置（10）は、いわゆる３管タイプの冷暖フリー式に構成される。なお、空気調和装置（10）は、２本の連絡配管を有するとともに冷暖同時運転が可能な、いわゆる２管タイプの冷暖フリー式であってもよい。 <Configuration of refrigerant circuit>
As shown in FIG. 4, the refrigerant circuit (11) of the first embodiment is provided with three connection pipes (16, 17). Specifically, the first gas communication pipe (16A), the second gas communication pipe (16B), and the liquid communication pipe (17) are connected to the refrigerant circuit (11). That is, the air conditioning apparatus (10) is configured as a so-called three-tube type heating and cooling free type. The air conditioner (10) may be a so-called two-tube cooling / heating free type having two connecting pipes and capable of simultaneous heating and cooling operation.
　室外回路（12）には、第１室外熱交換器（22A）、第２室外熱交換器（22B）、第１室外膨張弁（23A）、第２室外膨張弁（23B）、第１四方切換弁（24A）、及び第２四方切換弁（24B）が設けられる。 The outdoor circuit (12) includes a first outdoor heat exchanger (22A), a second outdoor heat exchanger (22B), a first outdoor expansion valve (23A), a second outdoor expansion valve (23B), and a first four-way switching. A valve (24A) and a second four-way switching valve (24B) are provided.
　第１室外熱交換器（22A）及び第２室外熱交換器（22B）は、互いに近接するように室外回路（12）に並列に接続される。第１室外熱交換器（22A）及び第２室外熱交換器（22B）の近傍には、これらに共用される室外ファン（25）が設置される。第１室外膨張弁（23A）は、第１室外熱交換器（22A）の液側に直列に接続される。第２室外膨張弁（23B）は、第２室外熱交換器（22B）の液側に直列に接続される。 The first outdoor heat exchanger (22A) and the second outdoor heat exchanger (22B) are connected in parallel to the outdoor circuit (12) so as to approach each other. In the vicinity of the first outdoor heat exchanger (22A) and the second outdoor heat exchanger (22B), an outdoor fan (25) shared by these is installed. The first outdoor expansion valve (23A) is connected in series to the liquid side of the first outdoor heat exchanger (22A). The second outdoor expansion valve (23B) is connected in series to the liquid side of the second outdoor heat exchanger (22B).
　第１四方切換弁（24A）及び第２四方切換弁（24B）は、詳細は後述する各運転を切り換えるための切換機構を構成している。具体的に、第１四方切換弁（24A）及び第２四方切換弁（24B）は、第１状態（図４の実線で示す状態）と、第２状態（図４の破線で示す状態）とにそれぞれ切換可能に構成される。第１四方切換弁（24A）及び第２四方切換弁（24B）は、１つのポートが閉塞され、実質的には三方弁として機能する。 The first four-way switching valve (24A) and the second four-way switching valve (24B) constitute a switching mechanism for switching each operation which will be described in detail later. Specifically, the first four-way switching valve (24A) and the second four-way switching valve (24B) are in the first state (the state shown by the solid line in FIG. 4) and the second state (the state shown by the broken line in FIG. 4). Each is switchable. The first four-way switching valve (24A) and the second four-way switching valve (24B) have one port closed and function substantially as a three-way valve.
　第１状態の第１四方切換弁（24A）は、圧縮機（21）の吐出側と第１室外熱交換器（22A）のガス端部とを連通させる。第２状態の第２四方切換弁（24B）は、圧縮機（21）の吸入側と第２室外熱交換器（22B）のガス端部とを連通させる。第２状態の第１四方切換弁（24A）は、圧縮機（21）の吸入側と第１室外熱交換器（22A）のガス端部とを連通させる。第２状態の第２四方切換弁（24B）は、圧縮機（21）の吐出側と第２室外熱交換器（22B）のガス端部とを連通させる。 The first four-way switching valve (24A) in the first state brings the discharge side of the compressor (21) into communication with the gas end of the first outdoor heat exchanger (22A). The second four-way switching valve (24B) in the second state brings the suction side of the compressor (21) into communication with the gas end of the second outdoor heat exchanger (22B). The first four-way switching valve (24A) in the second state brings the suction side of the compressor (21) into communication with the gas end of the first outdoor heat exchanger (22A). The second four-way switching valve (24B) in the second state brings the discharge side of the compressor (21) into communication with the gas end of the second outdoor heat exchanger (22B).
　実施形態２の冷媒回路（11）には、室内回路（13）に対応する第１切換回路（80）と、輻射回路（15）に対応する第２切換回路（90）とが接続される。第１切換回路（80）及び第２切換回路（90）は、冷暖同時運転を実現するための切換機構である。室内回路（13）は、第１切換回路（80）を介して３つの連絡配管（16A,16B,17）と接続している。輻射回路（15）は、第２切換回路（90）を介して３つの連絡配管（16A,16B,17）と接続している。 The refrigerant circuit (11) of the second embodiment is connected to a first switching circuit (80) corresponding to the indoor circuit (13) and a second switching circuit (90) corresponding to the radiation circuit (15). The first switching circuit (80) and the second switching circuit (90) are switching mechanisms for achieving simultaneous heating and cooling operation. The indoor circuit (13) is connected to the three connection pipes (16A, 16B, 17) via the first switching circuit (80). The radiation circuit (15) is connected to the three connection pipes (16A, 16B, 17) via the second switching circuit (90).
　第１切換回路（80）は、第１分岐管（81）、第２分岐管（82）、及び第１中継管（83）を備える。第１分岐管（81）の一端は、第１ガス連絡配管（16A）と繋がり、第２分岐管（82）の一端は、第２ガス連絡配管（16B）と繋がる。第１分岐管（81）及び第２分岐管（82）の他端は、室内回路（13）のガス端部と繋がる。第１中継管（83）の一端は、液連絡配管（17）と繋がる。第１中継管（83）の他端は、室内回路（13）の液端部と繋がる。第１分岐管（81）には、第１開閉弁（84）が設けられ、第２分岐管（82）には、第２開閉弁（85）が設けられる。 The first switching circuit (80) includes a first branch pipe (81), a second branch pipe (82), and a first relay pipe (83). One end of the first branch pipe (81) is connected to the first gas communication pipe (16A), and one end of the second branch pipe (82) is connected to the second gas communication pipe (16B). The other ends of the first branch pipe (81) and the second branch pipe (82) are connected to the gas end of the indoor circuit (13). One end of the first relay pipe (83) is connected to the liquid communication pipe (17). The other end of the first relay pipe (83) is connected to the liquid end of the indoor circuit (13). The first branch pipe (81) is provided with a first on-off valve (84), and the second branch pipe (82) is provided with a second on-off valve (85).
　第２切換回路（90）は、第３分岐管（91）、第４分岐管（92）、及び第２中継管（93）を備える。第３分岐管（91）の一端は、第１ガス連絡配管（16A）と繋がり、第４分岐管（92）の一端は、第２ガス連絡配管（16B）と繋がる。第３分岐管（91）及び第４分岐管（92）の他端は、輻射回路（15）のガス端部と繋がる。第２中継管（93）の一端は、液連絡配管（17）と繋がる。第２中継管（93）の他端は、輻射回路（15）の液端部と繋がる。第３分岐管（91）には、第３開閉弁（94）が設けられ、第４分岐管（92）には、第４開閉弁（95）が設けられる。 The second switching circuit (90) includes a third branch pipe (91), a fourth branch pipe (92), and a second relay pipe (93). One end of the third branch pipe (91) is connected to the first gas communication pipe (16A), and one end of the fourth branch pipe (92) is connected to the second gas communication pipe (16B). The other ends of the third branch pipe (91) and the fourth branch pipe (92) are connected to the gas end of the radiation circuit (15). One end of the second relay pipe (93) is connected to the liquid communication pipe (17). The other end of the second relay pipe (93) is connected to the liquid end of the radiation circuit (15). The third branch pipe (91) is provided with a third on-off valve (94), and the fourth branch pipe (92) is provided with a fourth on-off valve (95).
　以上のような冷媒回路（11）では、室内回路（13）及び輻射回路（15）が互いに並列に接続される。なお、室内回路（13）、及びこれに対応する第１切換回路（80）の数量は、２つ以上であってもよい。輻射回路（15）、及びこれに対応する第２切換回路（90）の数量は、２つ以上であってもよい。 In the refrigerant circuit (11) as described above, the indoor circuit (13) and the radiation circuit (15) are connected in parallel with each other. The number of indoor circuits (13) and the number of first switching circuits (80) corresponding thereto may be two or more. The number of the radiation circuit (15) and the corresponding second switching circuit (90) may be two or more.
　－運転動作－
　実施形態２の空気調和装置（10）では、冷房運転、暖房運転、及び冷暖同時運転が切換可能に構成される。ここで、ここで、冷暖同時運転は、少なくとも後述する２つの動作（第１冷暖同時運転及び第２冷暖同時運転）を含む。 -Driving operation-
In the air conditioner (10) of the second embodiment, the cooling operation, the heating operation, and the simultaneous heating and cooling operation are configured to be switchable. Here, the simultaneous heating and cooling operation includes at least two operations (first simultaneous heating and cooling operation and second simultaneous cooling and heating operation) described later.
　〈冷房運転〉
　図５に示す冷房運転では、実施形態１と同様、室内ユニット（30）及び輻射パネル（40）が冷房動作を行う。圧縮機（21）、室外ファン（25）、及び室内ファン（33）が運転される。例えば第１四方切換弁（24A）が第１状態、第２四方切換弁（24B）が第１状態となる。例えば第１室外膨張弁（23A）の開度は所定開度（例えば全開）に開放される。室内膨張弁（32）及び輻射膨張弁（51）の開度が、過熱度制御される。第１開閉弁（84）及び第３開閉弁（94）が閉状態となり、第２開閉弁（85）及び第４開閉弁（95）が開状態となる。冷房運転では、室外熱交換器（22）で凝縮・放熱した冷媒が、室内熱交換器（31）及び輻射熱交換器（52）で蒸発する冷凍サイクルが行われる。 <Cooling operation>
In the cooling operation shown in FIG. 5, the indoor unit (30) and the radiation panel (40) perform the cooling operation as in the first embodiment. The compressor (21), the outdoor fan (25), and the indoor fan (33) are operated. For example, the first four-way switching valve (24A) is in the first state, and the second four-way switching valve (24B) is in the first state. For example, the opening degree of the first outdoor expansion valve (23A) is opened to a predetermined opening degree (for example, full opening). The degree of superheat of the opening degree of the indoor expansion valve (32) and the radiation expansion valve (51) is controlled. The first on-off valve (84) and the third on-off valve (94) are closed, and the second on-off valve (85) and the fourth on-off valve (95) are open. In the cooling operation, a refrigeration cycle is performed in which the refrigerant condensed and radiated by the outdoor heat exchanger (22) is evaporated by the indoor heat exchanger (31) and the radiant heat exchanger (52).
　具体的に、圧縮機（21）で圧縮された冷媒は、第１室外熱交換器（22A）を流れる。第１室外熱交換器（22A）で凝縮した冷媒は、室外膨張弁（23）を通過した後、液連絡配管（17）を流れる。液連絡配管（17）を流れる冷媒は、室内回路（13）と輻射回路（15）とに分流する。 Specifically, the refrigerant compressed by the compressor (21) flows through the first outdoor heat exchanger (22A). The refrigerant condensed by the first outdoor heat exchanger (22A) flows through the liquid communication pipe (17) after passing through the outdoor expansion valve (23). The refrigerant flowing through the liquid communication pipe (17) is branched into the indoor circuit (13) and the radiation circuit (15).
　室内回路（13）を流れる冷媒は、室内膨張弁（32）で減圧された後、室内熱交換器（31）で蒸発する。これにより、室内ユニット（30）では、室内空気が冷却される冷房動作が行われる。室内熱交換器（31）で蒸発した冷媒は、第２分岐管（82）を経由して第２ガス連絡配管（16B）へ流出する。 The refrigerant flowing through the indoor circuit (13) is reduced in pressure by the indoor expansion valve (32) and then evaporated in the indoor heat exchanger (31). Thus, in the indoor unit (30), a cooling operation is performed to cool the indoor air. The refrigerant evaporated in the indoor heat exchanger (31) flows out to the second gas connection pipe (16B) via the second branch pipe (82).
　輻射回路（15）を流れる冷媒は、輻射膨張弁（51）で減圧された後、輻射熱交換器（52）で蒸発する。これにより、輻射パネル（40）では、室内空気が冷却される冷房動作が行われる。輻射パネル（40）で蒸発した冷媒は、第４分岐管（92）を経由して第２ガス連絡配管（16B）に流出する。 The refrigerant flowing through the radiation circuit (15) is depressurized by the radiation expansion valve (51) and then evaporated by the radiation heat exchanger (52). Thereby, in the radiation panel (40), a cooling operation is performed to cool the indoor air. The refrigerant evaporated by the radiation panel (40) flows out to the second gas connection pipe (16B) via the fourth branch pipe (92).
　第２ガス連絡配管（16B）で合流した冷媒は、圧縮機（21）に吸入されて再び圧縮される。 The refrigerant joined in the second gas connection pipe (16B) is sucked into the compressor (21) and compressed again.
　〈暖房運転〉
　図６に示す暖房運転では、実施形態１と同様、室内ユニット（30）及び輻射パネル（40）が暖房動作を行う。圧縮機（21）、室外ファン（25）、及び室内ファン（33）が運転される。例えば第１四方切換弁（24A）が第２状態、第２四方切換弁（24B）が第１状態となる。例えば第１室外膨張弁（23A）の開度は過熱度制御される。室内膨張弁（32）及び輻射膨張弁（51）の開度が、過冷却度制御される。第１開閉弁（84）及び第３開閉弁（94）が開状態となり、第２開閉弁（85）及び第４開閉弁（95）が閉状態となる。暖房運転では、室内熱交換器（31）及び輻射熱交換器（52）で凝縮・放熱した冷媒が、室外熱交換器（22）で蒸発する冷凍サイクルが行われる。 <Heating operation>
In the heating operation shown in FIG. 6, the indoor unit (30) and the radiation panel (40) perform the heating operation as in the first embodiment. The compressor (21), the outdoor fan (25), and the indoor fan (33) are operated. For example, the first four-way switching valve (24A) is in the second state, and the second four-way switching valve (24B) is in the first state. For example, the opening degree of the first outdoor expansion valve (23A) is subjected to superheat degree control. The degree of supercooling control of the opening degree of the indoor expansion valve (32) and the radiation expansion valve (51) is performed. The first on-off valve (84) and the third on-off valve (94) are opened, and the second on-off valve (85) and the fourth on-off valve (95) are closed. In the heating operation, a refrigeration cycle is performed in which the refrigerant condensed and radiated by the indoor heat exchanger (31) and the radiant heat exchanger (52) is evaporated by the outdoor heat exchanger (22).
　具体的に、圧縮機（21）で圧縮された冷媒は、第１ガス連絡配管（16A）を流れ、第１切換回路（80）と第２切換回路（90）とに分流する。第１切換回路（80）の冷媒は、第１分岐管（81）を経由して室内回路（13）に流入する。第２切換回路（90）の冷媒は、第３分岐管（91）を経由して輻射回路（15）に流入する。 Specifically, the refrigerant compressed by the compressor (21) flows through the first gas connection pipe (16A) and is diverted to the first switching circuit (80) and the second switching circuit (90). The refrigerant of the first switching circuit (80) flows into the indoor circuit (13) via the first branch pipe (81). The refrigerant of the second switching circuit (90) flows into the radiation circuit (15) via the third branch pipe (91).
　室内回路（13）に流入した冷媒は、室内熱交換器（31）で凝縮・放熱する。これにより、室内ユニット（30）では、室内空気が加熱される暖房動作が行われる。室内熱交換器（31）で凝縮した冷媒は、第１中継管（83）を経由して液連絡配管（17）に流出する。 The refrigerant flowing into the indoor circuit (13) condenses and dissipates heat in the indoor heat exchanger (31). Thus, in the indoor unit (30), a heating operation is performed in which the indoor air is heated. The refrigerant condensed by the indoor heat exchanger (31) flows out to the liquid communication pipe (17) via the first relay pipe (83).
　輻射回路（15）に流入した冷媒は、輻射熱交換器（52）で凝縮・放熱する。これにより、輻射パネル（40）では、室内空気が加熱される暖房動作が行われる。輻射熱交換器（52）で凝縮した冷媒は、第２中継管（93）を経由して液連絡配管（17）に流出する。 The refrigerant flowing into the radiation circuit (15) condenses and dissipates heat in the radiant heat exchanger (52). Thereby, in the radiation panel (40), a heating operation in which the indoor air is heated is performed. The refrigerant condensed by the radiant heat exchanger (52) flows out to the liquid communication pipe (17) via the second relay pipe (93).
　液連絡配管（17）で合流した冷媒は、室外回路（12）へ流入し、例えば第１室外膨張弁（23A）で減圧された後、第１室外熱交換器（22A）で蒸発する。第１室外熱交換器（22A）で蒸発した冷媒は、圧縮機（21）に吸入されて再び圧縮される。 The refrigerant joined in the liquid communication pipe (17) flows into the outdoor circuit (12), and is decompressed by, for example, the first outdoor expansion valve (23A), and then evaporated in the first outdoor heat exchanger (22A). The refrigerant evaporated in the first outdoor heat exchanger (22A) is sucked into the compressor (21) and compressed again.
　〈第１冷暖同時運転〉
　図７に示す第１冷暖同時運転では、室内ユニット（30）が暖房動作を行うと同時に、輻射パネル（40）が冷房動作を行う。なお、例えば室内ユニット（30）及び輻射パネル（40）は、異なる室内空間に配置される。しかし、室内ユニット（30）及び輻射パネル（40）を同一の室内空間に配置しつつ、第１冷房同時運転を行うこともできる。 <First simultaneous cooling and heating operation>
In the first simultaneous cooling and heating operation shown in FIG. 7, the radiation panel (40) performs the cooling operation at the same time as the indoor unit (30) performs the heating operation. For example, the indoor unit (30) and the radiation panel (40) are disposed in different indoor spaces. However, the first simultaneous cooling operation can also be performed while arranging the indoor unit (30) and the radiation panel (40) in the same indoor space.
　第１冷暖同時運転では、圧縮機（21）、室外ファン（25）、及び室内ファン（33）が運転される。例えば第１四方切換弁（24A）が第１状態、第２四方切換弁（24B）が第１状態となる。例えば第１室外膨張弁（23A）の開度は所定開度（例えば全開）に開放される。室内膨張弁（32）の開度は、過冷却度制御される。輻射膨張弁（51）の開度は、過熱度制御される。第１開閉弁（84）及び第４開閉弁（95）が開状態となり、第２開閉弁（85）及び第３開閉弁（94）が閉状態となる。第１冷暖同時運転では、第１室外熱交換器（22A）及び室内熱交換器（31）で凝縮・放熱した冷媒が、輻射熱交換器（52）で蒸発する冷凍サイクルが行われる。なお、この冷凍サイクルにおいて、例えば第２室外膨張弁（23B）の開度を過熱度制御しながら、第２室外熱交換器（22B）を蒸発器として用いてもよい。 In the first simultaneous cooling and heating operation, the compressor (21), the outdoor fan (25), and the indoor fan (33) are operated. For example, the first four-way switching valve (24A) is in the first state, and the second four-way switching valve (24B) is in the first state. For example, the opening degree of the first outdoor expansion valve (23A) is opened to a predetermined opening degree (for example, full opening). The degree of opening of the indoor expansion valve (32) is subjected to subcooling control. The degree of opening of the radiation expansion valve (51) is controlled at the degree of superheat. The first on-off valve (84) and the fourth on-off valve (95) are opened, and the second on-off valve (85) and the third on-off valve (94) are closed. In the first simultaneous cooling and heating operation, a refrigeration cycle is performed in which the refrigerant condensed and dissipated in the first outdoor heat exchanger (22A) and the indoor heat exchanger (31) evaporates in the radiant heat exchanger (52). In this refrigeration cycle, for example, the second outdoor heat exchanger (22B) may be used as an evaporator while controlling the degree of superheat of the opening degree of the second outdoor expansion valve (23B).
　圧縮機（21）で圧縮された冷媒は、一部が第１室外熱交換器（22A）で凝縮し、残りは第１ガス連絡配管（16A）へ流出する。第１ガス連絡配管（16A）の冷媒は、第１分岐管（81）を経由して室内回路（13）に流入する。室内回路（13）に流入した冷媒は、室内熱交換器（31）で凝縮・放熱する。これにより、室内ユニット（30）では、室内空気が加熱される暖房動作が行われる。室内熱交換器（31）で凝縮した冷媒は、第１中継管（83）を経由して液連絡配管（17）に流出する。 A part of the refrigerant compressed by the compressor (21) is condensed in the first outdoor heat exchanger (22A), and the rest flows out to the first gas communication pipe (16A). The refrigerant of the first gas connection pipe (16A) flows into the indoor circuit (13) via the first branch pipe (81). The refrigerant flowing into the indoor circuit (13) condenses and dissipates heat in the indoor heat exchanger (31). Thus, in the indoor unit (30), a heating operation is performed in which the indoor air is heated. The refrigerant condensed by the indoor heat exchanger (31) flows out to the liquid communication pipe (17) via the first relay pipe (83).
　第１室外熱交換器（22A）で凝縮した後の冷媒は、液連絡配管（17）に流出し、室内熱交換器（31）で凝縮した冷媒と合流する。 The refrigerant condensed in the first outdoor heat exchanger (22A) flows out to the liquid communication pipe (17), and joins with the refrigerant condensed in the indoor heat exchanger (31).
　液連絡配管（17）で合流した冷媒は、第２中継管（93）を経由して輻射回路（15）に流入する。輻射回路（15）に流入した冷媒は、輻射膨張弁（51）で減圧された後、輻射熱交換器（52）で蒸発する。これにより、輻射パネル（40）では、室内空気が冷却される冷房動作が行われる。輻射パネル（40）で蒸発した冷媒は、第４分岐管（92）を経由して第２ガス連絡配管（16B）に流出する。第２ガス連絡配管（16B）の冷媒は、圧縮機（21）に吸入されて再び圧縮される。 The refrigerant merged in the liquid communication pipe (17) flows into the radiation circuit (15) via the second relay pipe (93). The refrigerant flowing into the radiation circuit (15) is reduced in pressure by the radiation expansion valve (51) and then evaporated in the radiation heat exchanger (52). Thereby, in the radiation panel (40), a cooling operation is performed to cool the indoor air. The refrigerant evaporated by the radiation panel (40) flows out to the second gas connection pipe (16B) via the fourth branch pipe (92). The refrigerant in the second gas connection pipe (16B) is sucked into the compressor (21) and compressed again.
　〈第２冷暖同時運転〉
　図８に示す第２冷暖同時運転では、室内ユニット（30）が冷房動作を行うと同時に、輻射パネル（40）が暖房動作を行う。室内ユニット（30）及び輻射パネル（40）は、異なる室内空間に配置される。しかし、室内ユニット（30）及び輻射パネル（40）を同一の室内空間に配置しつつ、第２冷房同時運転を行うこともできる。 <Second cooling and heating simultaneous operation>
In the second simultaneous cooling and heating operation shown in FIG. 8, the indoor unit (30) performs the cooling operation and the radiation panel (40) performs the heating operation at the same time. The indoor unit (30) and the radiation panel (40) are arranged in different indoor spaces. However, the second cooling simultaneous operation can also be performed while arranging the indoor unit (30) and the radiation panel (40) in the same indoor space.
　第２冷暖同時運転では、圧縮機（21）、室外ファン（25）、及び室内ファン（33）が運転される。例えば第１四方切換弁（24A）が第１状態、第２四方切換弁（24B）が第１状態となる。例えば第１室外膨張弁（23A）の開度は所定開度（例えば全開）に開放される。室内膨張弁（32）の開度は、過熱度制御される。輻射膨張弁（51）の開度は、過冷却度制御される。第２開閉弁（85）及び第３開閉弁（94）が開状態となり、第１開閉弁（84）及び第４開閉弁（95）が閉状態となる。第２冷暖同時運転では、第１室外熱交換器（22A）及び輻射熱交換器（52）で凝縮・放熱した冷媒が、室内熱交換器（31）で蒸発する冷凍サイクルが行われる。なお、この冷凍サイクルにおいて、例えば第２室外膨張弁（23B）の開度を過熱度制御しながら、第２室外熱交換器（22B）を蒸発器として用いてもよい。 In the second simultaneous cooling and heating operation, the compressor (21), the outdoor fan (25), and the indoor fan (33) are operated. For example, the first four-way switching valve (24A) is in the first state, and the second four-way switching valve (24B) is in the first state. For example, the opening degree of the first outdoor expansion valve (23A) is opened to a predetermined opening degree (for example, full opening). The degree of opening of the indoor expansion valve (32) is controlled to the degree of superheat. The degree of opening of the radiation expansion valve (51) is subjected to subcooling control. The second on-off valve (85) and the third on-off valve (94) are opened, and the first on-off valve (84) and the fourth on-off valve (95) are closed. In the second simultaneous cooling and heating operation, a refrigeration cycle is performed in which the refrigerant condensed and dissipated in the first outdoor heat exchanger (22A) and the radiant heat exchanger (52) evaporates in the indoor heat exchanger (31). In this refrigeration cycle, for example, the second outdoor heat exchanger (22B) may be used as an evaporator while controlling the degree of superheat of the opening degree of the second outdoor expansion valve (23B).
　圧縮機（21）で圧縮された冷媒は、一部が第１室外熱交換器（22A）で凝縮し、残りは第１ガス連絡配管（16A）へ流出する。第１ガス連絡配管（16A）の冷媒は、第３分岐管（91）を経由して輻射回路（15）に流入する。輻射回路（15）に流入した冷媒は、輻射熱交換器（52）で凝縮・放熱する。これにより、輻射パネル（40）では、室内空気が加熱される暖房動作が行われる。輻射熱交換器（52）で凝縮した冷媒は、第２中継管（93）を経由して液連絡配管（17）に流出する。 A part of the refrigerant compressed by the compressor (21) is condensed in the first outdoor heat exchanger (22A), and the rest flows out to the first gas communication pipe (16A). The refrigerant of the first gas connection pipe (16A) flows into the radiation circuit (15) via the third branch pipe (91). The refrigerant flowing into the radiation circuit (15) condenses and dissipates heat in the radiant heat exchanger (52). Thereby, in the radiation panel (40), a heating operation in which the indoor air is heated is performed. The refrigerant condensed by the radiant heat exchanger (52) flows out to the liquid communication pipe (17) via the second relay pipe (93).
　第１室外熱交換器（22A）で凝縮した後の冷媒は、液連絡配管（17）に流出し、輻射熱交換器（52）で凝縮した冷媒と合流する。 The refrigerant condensed in the first outdoor heat exchanger (22A) flows out to the liquid communication pipe (17), and merges with the refrigerant condensed in the radiant heat exchanger (52).
　液連絡配管（17）で合流した冷媒は、第２分岐管（82）を経由して室内回路（13）に流入する。室内回路（13）に流入した冷媒は、室内膨張弁（32）で減圧された後、室内熱交換器（31）で蒸発する。これにより、室内ユニット（30）では、室内空気が冷却される冷房動作が行われる。室内熱交換器（31）で蒸発した冷媒は、第２分岐管（82）を経由して第２ガス連絡配管（16B）に流出する。第２ガス連絡配管（16B）の冷媒は、圧縮機（21）に吸入されて再び圧縮される。 The refrigerant joined in the liquid communication pipe (17) flows into the indoor circuit (13) via the second branch pipe (82). The refrigerant flowing into the indoor circuit (13) is depressurized by the indoor expansion valve (32) and then evaporated in the indoor heat exchanger (31). Thus, in the indoor unit (30), a cooling operation is performed to cool the indoor air. The refrigerant evaporated in the indoor heat exchanger (31) flows out to the second gas connection pipe (16B) via the second branch pipe (82). The refrigerant in the second gas connection pipe (16B) is sucked into the compressor (21) and compressed again.
　液連絡配管（17）で合流した冷媒は、第２中継管（93）を経由して室内回路（13）に流入する。室内回路（13）に流入した冷媒は、室内膨張弁（32）で減圧された後、室内熱交換器（31）で蒸発する。これにより、室内ユニット（30）では、室内空気が加熱される暖房動作が行われる。室内ユニット（30）で蒸発した冷媒は、第２分岐管（82）を経由して第２ガス連絡配管（16B）に流出する。第２ガス連絡配管（16B）の冷媒は、圧縮機（21）に吸入されて再び圧縮される。 The refrigerant joined in the liquid communication pipe (17) flows into the indoor circuit (13) via the second relay pipe (93). The refrigerant flowing into the indoor circuit (13) is depressurized by the indoor expansion valve (32) and then evaporated in the indoor heat exchanger (31). Thus, in the indoor unit (30), a heating operation is performed in which the indoor air is heated. The refrigerant evaporated in the indoor unit (30) flows out to the second gas connection pipe (16B) via the second branch pipe (82). The refrigerant in the second gas connection pipe (16B) is sucked into the compressor (21) and compressed again.
　－実施形態２の効果－
　上記実施形態２では、実施形態１と同様、室内回路（13）と輻射回路（15）とが並列に接続される。このため、冷房運転では、室内熱交換器（31）及び輻射熱交換器（52）で蒸発する冷媒の流量を個別に制御できる。同様に、暖房運転では、室内熱交換器（31）及び輻射熱交換器（52）で凝縮する冷媒の流量を個別に制御できる。 -Effect of Embodiment 2-
In the second embodiment, as in the first embodiment, the indoor circuit (13) and the radiation circuit (15) are connected in parallel. For this reason, in the cooling operation, the flow rates of the refrigerant evaporated in the indoor heat exchanger (31) and the radiant heat exchanger (52) can be individually controlled. Similarly, in the heating operation, the flow rates of the refrigerant condensed in the indoor heat exchanger (31) and the radiant heat exchanger (52) can be individually controlled.
　上記実施形態２では、室内熱交換器（31）及び輻射熱交換器（52）の一方を放熱器とし、他方を蒸発器とする冷凍サイクルを行うことができる。具体的には、第１冷暖同時運転では、室内熱交換器（31）を放熱器とし、輻射熱交換器（52）を蒸発器とする冷凍サイクルを行うことができる。従って、室内ユニット（30）で暖房動作を行うと同時に輻射パネル（40）で冷房動作を行う運転を実現できる。また、第２冷暖同時運転では、輻射熱交換器（52）を放熱器とし、室内熱交換器（31）を蒸発器とする冷凍サイクルを行うことができる。従って、輻射パネル（40）で暖房動作を行うと同時に室内ユニット（30）で冷房動作を行う運転を実現できる。 In the second embodiment, it is possible to perform a refrigeration cycle in which one of the indoor heat exchanger (31) and the radiant heat exchanger (52) is a radiator and the other is an evaporator. Specifically, in the first simultaneous cooling and heating operation, it is possible to perform a refrigeration cycle in which the indoor heat exchanger (31) is a radiator and the radiation heat exchanger (52) is an evaporator. Therefore, the heating operation can be performed by the indoor unit (30) and the cooling operation can be realized by the radiation panel (40) at the same time. In the second simultaneous cooling and heating operation, it is possible to perform a refrigeration cycle in which the radiant heat exchanger (52) is a radiator and the indoor heat exchanger (31) is an evaporator. Therefore, the heating operation can be performed by the radiation panel (40) and the cooling operation can be realized by the indoor unit (30) at the same time.
　《実施形態３》
　図９に示す実施形態３に係る空気調和装置（10）は、室内回路（13）及び輻射回路（15）が１つの空調ユニット（U）に設けられる。空調ユニット（U）は、室内の床面に設置される床置き式に構成される。実施形態３の空気調和装置（10）では、例えば実施形態１と同様の構成の室外ユニット（20）と、空調ユニット（U）とがガス連絡配管（16）及び液連絡配管（17）を介して互いに接続される。四方切換弁（24）は、冷房運転において第１状態（図９の実線で示す状態）となり、暖房運転において第２状態（図９の破線で示す状態）となる。 Embodiment 3
In the air conditioner (10) according to the third embodiment shown in FIG. 9, the indoor circuit (13) and the radiation circuit (15) are provided in one air conditioning unit (U). The air conditioning unit (U) is configured to be installed on a floor surface in a room. In the air conditioner (10) of the third embodiment, for example, the outdoor unit (20) having the same configuration as that of the first embodiment and the air conditioning unit (U) are connected via the gas communication pipe (16) and the liquid communication pipe (17). Connected to each other. The four-way switching valve (24) is in the first state (state shown by the solid line in FIG. 9) in the cooling operation, and is in the second state (state shown by the broken line in FIG. 9) in the heating operation.
　実施形態３の冷房運転や暖房運転は、基本的に上記実施形態１と同様である。つまり、冷房運転では、圧縮機（21）で圧縮された冷媒が、室外熱交換器（22）で凝縮し、室内熱交換器（31）及び輻射熱交換器（52）で蒸発する。また、暖房運転では、圧縮機（21）で圧縮された冷媒が、室内熱交換器（31）及び輻射熱交換器（52）で凝縮し、室外熱交換器（22）で蒸発する。 The cooling operation and the heating operation of the third embodiment are basically the same as the first embodiment. That is, in the cooling operation, the refrigerant compressed by the compressor (21) is condensed by the outdoor heat exchanger (22) and is evaporated by the indoor heat exchanger (31) and the radiant heat exchanger (52). In the heating operation, the refrigerant compressed by the compressor (21) is condensed by the indoor heat exchanger (31) and the radiant heat exchanger (52), and is evaporated by the outdoor heat exchanger (22).
　実施形態３では、空調ユニット（U）において、室内回路（13）及び輻射回路（15）が互いに並列に接続される。このため、冷房運転や暖房運転において、室内回路（13）及び輻射回路（15）を流れる冷媒の流量を、室内膨張弁（32）及び輻射膨張弁（51）によって個別に制御できる。 In the third embodiment, in the air conditioning unit (U), the indoor circuit (13) and the radiation circuit (15) are connected in parallel with each other. Therefore, in the cooling operation and the heating operation, the flow rate of the refrigerant flowing through the indoor circuit (13) and the radiation circuit (15) can be individually controlled by the indoor expansion valve (32) and the radiation expansion valve (51).
　実施形態３の冷房運転において、室内膨張弁（32）の開度を全閉、ないしゼロとし且つ輻射膨張弁（51）を所定開度で開放することで、輻射パネル（40）のみで冷房動作を行うことが可能である。同様に、冷房運転において、輻射膨張弁（51）の開度を全閉、ないしゼロとし、室内膨張弁（32）を所定開度で開放することで、室内熱交換器（31）のみで冷房動作を行うことも可能である。 In the cooling operation of the third embodiment, the cooling operation is performed only with the radiation panel (40) by setting the opening degree of the indoor expansion valve (32) to fully close or zero or opening the radiation expansion valve (51) at a predetermined opening degree. It is possible to Similarly, in the cooling operation, the opening degree of the radiation expansion valve (51) is fully closed or to zero, and the indoor expansion valve (32) is opened at a predetermined opening degree, so that only the indoor heat exchanger (31) cools. It is also possible to perform an operation.
　実施形態３の暖房運転において、室内膨張弁（32）の開度を全閉、ないしゼロとし、輻射膨張弁（51）を所定開度で開放することで、輻射パネル（40）のみで暖房動作を行うことが可能である。同様に、暖房運転において、輻射膨張弁（51）の開度を全閉、ないしゼロとし、室内膨張弁（32）を所定開度で開放することで、室内熱交換器（31）のみで暖房動作を行うことも可能である。 In the heating operation of Embodiment 3, the heating operation is performed only with the radiation panel (40) by setting the opening degree of the indoor expansion valve (32) to fully close or zero, and opening the radiation expansion valve (51) at a predetermined opening degree. It is possible to Similarly, in the heating operation, the opening degree of the radiation expansion valve (51) is fully closed or zero, and the indoor expansion valve (32) is opened at a predetermined opening degree, so that heating is performed only with the indoor heat exchanger (31). It is also possible to perform an operation.
　《その他の実施形態》
　上記実施形態や、各変形例においては、以下のような構成としてもよい。 << Other Embodiments >>
In the above embodiment and each modification, the following configuration may be employed.
　室内ユニット（30）は、天井側に設けられる天井設置式（厳密には、天井吊り下げ式や天井埋め込み式）以外にも、床面に設置される床置き式や、壁面に設置される壁掛け式であってもよい。 The indoor unit (30) is a floor-standing type installed on the floor surface or a wall-mounted type installed on a wall surface besides ceiling-mounted type (strictly, ceiling-hanging type or ceiling-embedding type) provided on the ceiling side It may be a formula.
　輻射パネル（40）は、床置き式以外にも、天井側に設けられる天井設置式や、壁面に設置される壁掛け式であってもよい。 Besides the floor-standing type, the radiation panel (40) may be a ceiling-mounted type provided on the ceiling side or a wall-mounted type provided on a wall surface.
　－その他の制御例－
　上述した実施形態１～３、及びその他の実施形態については、以下のように空気調和装置（10）を制御してもよい。 -Other control examples-
The air conditioner (10) may be controlled as in the following embodiments 1 to 3 and other embodiments.
　〈冷房運転の制御例〉
　空気調和装置（10）の冷房運転は、第１動作、第２動作、及び第３動作を含む。 Control Example of Cooling Operation
The cooling operation of the air conditioner (10) includes a first operation, a second operation, and a third operation.
　第１動作では、室内ユニット（30）及び輻射パネル（40）のうち室内ユニット（30）のみが冷房動作を行う。換言すると、第１動作では、室内熱交換器（31）及び輻射熱交換器（52）のうち室内熱交換器（31）のみが冷房動作を行う。 In the first operation, only the indoor unit (30) of the indoor unit (30) and the radiation panel (40) performs the cooling operation. In other words, in the first operation, of the indoor heat exchanger (31) and the radiant heat exchanger (52), only the indoor heat exchanger (31) performs the cooling operation.
　第１動作では、室内熱交換器（31）に対応する室内膨張弁（32）が開放される。室内膨張弁（32）の開度は、室内熱交換器（31）を流出した冷媒の過熱度ＳＨ１に基づいて制御される。第１動作では、輻射パネル（40）に対応する輻射膨張弁（51）の開度が全閉、又は微小開度に制御される。ここでいう「微小開度」は、輻射熱交換器（52）で実質的に冷房動作が行われない程度の開度である。第１動作では、室内ファン（33）が運転される。 In the first operation, the indoor expansion valve (32) corresponding to the indoor heat exchanger (31) is opened. The degree of opening of the indoor expansion valve (32) is controlled based on the degree of superheat SH1 of the refrigerant flowing out of the indoor heat exchanger (31). In the first operation, the opening degree of the radiation expansion valve (51) corresponding to the radiation panel (40) is controlled to be fully closed or slightly open. The "small opening degree" referred to herein is an opening degree at which the radiation heat exchanger (52) substantially does not perform the cooling operation. In the first operation, the indoor fan (33) is operated.
　第１動作中の冷媒回路（11）では、室外熱交換器（22）を凝縮器ないし放熱器とし、室内熱交換器（31）を蒸発器とし、輻射熱交換器（52）を停止させる冷凍サイクルが行われる。 In the refrigerant circuit (11) in the first operation, the outdoor heat exchanger (22) is a condenser or a radiator, the indoor heat exchanger (31) is an evaporator, and the radiation cycle (52) is stopped Is done.
　第２動作では、室内ユニット（30）及び輻射パネル（40）のうち輻射パネル（40）のみが冷房動作を行う。換言すると、第２動作では、室内熱交換器（31）及び輻射熱交換器（52）のうち輻射熱交換器（52）のみが冷房動作を行う。 In the second operation, only the radiation panel (40) of the indoor unit (30) and the radiation panel (40) performs the cooling operation. In other words, in the second operation, of the indoor heat exchanger (31) and the radiant heat exchanger (52), only the radiant heat exchanger (52) performs the cooling operation.
　第２動作では、輻射熱交換器（52）に対応する輻射膨張弁（51）が開放される。輻射膨張弁（51）の開度は、輻射熱交換器（52）を流出した冷媒の過熱度ＳＨ２に基づいて制御される。第２動作では、室内ユニット（30）に対応する室内膨張弁（32）の開度が全閉、又は微小開度に制御される。ここでいう「微小開度」は、室内熱交換器（31）で実質的に冷房動作が行われない程度の開度である。第２動作では、室内ファン（33）が停止する。 In the second operation, the radiation expansion valve (51) corresponding to the radiation heat exchanger (52) is opened. The opening degree of the radiation expansion valve (51) is controlled based on the degree of superheat SH2 of the refrigerant flowing out of the radiation heat exchanger (52). In the second operation, the opening degree of the indoor expansion valve (32) corresponding to the indoor unit (30) is controlled to be fully closed or slightly open. The "small opening degree" referred to herein is an opening degree at which the cooling operation is not substantially performed in the indoor heat exchanger (31). In the second operation, the indoor fan (33) is stopped.
　第２動作中の冷媒回路（11）では、室外熱交換器（22）を凝縮器ないし放熱器とし、輻射熱交換器（52）を蒸発器とし、室内熱交換器（31）を停止させる冷凍サイクルが行われる。 In the refrigerant circuit (11) in the second operation, a refrigeration cycle in which the outdoor heat exchanger (22) is a condenser or a radiator, the radiation heat exchanger (52) is an evaporator, and the indoor heat exchanger (31) is stopped. Is done.
　第３動作では、室内ユニット（30）及び輻射パネル（40）が冷房動作を行う。換言すると、第３動作では、室内熱交換器（31）及び輻射熱交換器（52）が冷房動作を行う。 In the third operation, the indoor unit (30) and the radiation panel (40) perform a cooling operation. In other words, in the third operation, the indoor heat exchanger (31) and the radiant heat exchanger (52) perform the cooling operation.
　第３動作では、室内熱交換器（31）に対応する室内膨張弁（32）が開放される。室内膨張弁（32）の開度は、室内熱交換器（31）を流出した冷媒の過熱度ＳＨ１に基づいて制御される。第３動作では、輻射熱交換器（52）に対応する輻射膨張弁（51）が開放される。輻射膨張弁（51）の開度は、輻射熱交換器（52）を流出した冷媒の過熱度ＳＨ２に基づいて制御される。第３動作では、室内ファン（33）が運転される。 In the third operation, the indoor expansion valve (32) corresponding to the indoor heat exchanger (31) is opened. The degree of opening of the indoor expansion valve (32) is controlled based on the degree of superheat SH1 of the refrigerant flowing out of the indoor heat exchanger (31). In the third operation, the radiation expansion valve (51) corresponding to the radiation heat exchanger (52) is opened. The opening degree of the radiation expansion valve (51) is controlled based on the degree of superheat SH2 of the refrigerant flowing out of the radiation heat exchanger (52). In the third operation, the indoor fan (33) is operated.
　第３動作中の冷媒回路（11）では、室外熱交換器（22）を凝縮器ないし放熱器とし、室内熱交換器（31）及び輻射熱交換器（52）を蒸発器とする冷凍サイクルが行われる。 In the refrigerant circuit (11) in the third operation, the refrigeration cycle using the outdoor heat exchanger (22) as a condenser or a radiator and the indoor heat exchanger (31) and the radiant heat exchanger (52) as evaporators It will be.
　冷房運転では、室内の冷房負荷を示す指標に基づいて、第１動作、第２動作、及び第３動作が切り換えられる。空気調和装置（10）は、室内の冷房負荷を示す指標に基づいて、第１動作、第２動作、及び第３動作を切り換える制御部を備える。制御部は、上述した室内コントローラ（C1）及び輻射コントローラ（C2）を含む。冷房負荷を示す指標は、上述した室内空気の温度Ｔｒと、設定温度Ｔsとの差（Ｔr－Ｔs）である。室内温度センサ（71）は、冷房負荷を検出する負荷検出部を構成する。冷房負荷を示す指標はこれに限られない。 In the cooling operation, the first operation, the second operation, and the third operation are switched based on the index indicating the cooling load of the room. The air conditioning apparatus (10) includes a control unit that switches the first operation, the second operation, and the third operation based on an index indicating a cooling load in the room. The control unit includes the indoor controller (C1) and the radiation controller (C2) described above. The index indicating the cooling load is the difference (Tr−Ts) between the temperature Tr of the indoor air described above and the set temperature Ts. The indoor temperature sensor (71) constitutes a load detection unit that detects a cooling load. The index indicating the cooling load is not limited to this.
　空気調和装置（10）は、冷房運転の開始時において第３動作を行う。第３動作では、室内ユニット（30）及び輻射パネル（40）が冷房動作を行う。この第３動作により、室内の冷房負荷を速やかに低減できる。 The air conditioner (10) performs the third operation at the start of the cooling operation. In the third operation, the indoor unit (30) and the radiation panel (40) perform a cooling operation. By the third operation, the cooling load in the room can be rapidly reduced.
　第３動作中において、室内の冷房負荷が所定値よりも低くなる条件が成立すると、第３動作から第２動作に切り換わる。第２動作では、輻射パネル（40）のみが冷房動作を行う。この第２動作により、室内温度が過剰に低くなることを抑制できる。加えて、室内ユニット（30）から吹き出される冷風が在室者にあたることを確実に回避できる。 During the third operation, the third operation is switched to the second operation when a condition is established in which the cooling load in the room is lower than a predetermined value. In the second operation, only the radiation panel (40) performs the cooling operation. This second operation can suppress the room temperature from becoming excessively low. In addition, cold air blown from the indoor unit (30) can be reliably avoided from hitting the occupants.
　第３動作は、必ずしも冷房運転の開始時のみに実行しなくてもよい。冷房運転の開始後において、室内の冷房負荷が所定値よりも高くなる条件が成立すると、第３動作が実行される。この第３動作により、室内の冷房負荷を速やかに低減できる。この場合にも、第３動作中において、室内の冷房負荷が所定値よりも低くなる条件が成立すると、第３動作から第２動作に切り換わる。第２動作では、輻射パネル（40）のみが冷房動作を行う。この第２動作により、室内温度が過剰に低くなることを抑制できる。加えて、室内ユニット（30）から吹き出される冷風が在室者にあたることを確実に回避できる。 The third operation may not necessarily be performed only at the start of the cooling operation. After the start of the cooling operation, the third operation is performed when the condition for the indoor cooling load to become higher than a predetermined value is satisfied. By the third operation, the cooling load in the room can be rapidly reduced. Also in this case, the third operation is switched to the second operation when a condition is established in which the cooling load in the room is lower than a predetermined value during the third operation. In the second operation, only the radiation panel (40) performs the cooling operation. This second operation can suppress the room temperature from becoming excessively low. In addition, cold air blown from the indoor unit (30) can be reliably avoided from hitting the occupants.
　〈暖房運転の制御例〉
　空気調和装置（10）の暖房運転は、第４動作、第５動作、及び第６動作を含む。 <Example of control of heating operation>
The heating operation of the air conditioner (10) includes a fourth operation, a fifth operation, and a sixth operation.
　第４動作では、室内ユニット（30）及び輻射パネル（40）のうち室内ユニット（30）のみが暖房動作を行う。換言すると、第４動作では、室内熱交換器（31）及び輻射熱交換器（52）のうち室内熱交換器（31）のみが暖房動作を行う。 In the fourth operation, only the indoor unit (30) of the indoor unit (30) and the radiation panel (40) performs a heating operation. In other words, in the fourth operation, of the indoor heat exchanger (31) and the radiant heat exchanger (52), only the indoor heat exchanger (31) performs the heating operation.
　第４動作では、室内熱交換器（31）に対応する室内膨張弁（32）が開放される。室内膨張弁（32）の開度は、室内熱交換器（31）を流出した冷媒の過冷却度ＳＣ１に基づいて制御される。第４動作では、輻射パネル（40）に対応する輻射膨張弁（51）の開度が全閉、又は微小開度に制御される。ここでいう「微小開度」は、輻射熱交換器（52）で実質的に暖房動作が行われない程度の開度である。第４動作では、室内ファン（33）が運転される。 In the fourth operation, the indoor expansion valve (32) corresponding to the indoor heat exchanger (31) is opened. The degree of opening of the indoor expansion valve (32) is controlled based on the degree of supercooling SC1 of the refrigerant flowing out of the indoor heat exchanger (31). In the fourth operation, the opening degree of the radiation expansion valve (51) corresponding to the radiation panel (40) is controlled to be fully closed or slightly open. The "small opening degree" referred to here is an opening degree at which the heating operation is not substantially performed by the radiation heat exchanger (52). In the fourth operation, the indoor fan (33) is operated.
　第４動作中の冷媒回路（11）では、室内熱交換器（31）を凝縮器ないし放熱器とし、室外熱交換器（22）を蒸発器とし、輻射熱交換器（52）を停止させる冷凍サイクルが行われる。 In the refrigerant circuit (11) in the fourth operation, a refrigeration cycle in which the indoor heat exchanger (31) is a condenser or a radiator, the outdoor heat exchanger (22) is an evaporator, and the radiant heat exchanger (52) is stopped. Is done.
　第５動作では、室内ユニット（30）及び輻射パネル（40）のうち輻射パネル（40）のみが暖房動作を行う。換言すると、第５動作では、室内熱交換器（31）及び輻射熱交換器（52）のうち輻射熱交換器（52）のみが暖房動作を行う。 In the fifth operation, only the radiation panel (40) of the indoor unit (30) and the radiation panel (40) performs a heating operation. In other words, in the fifth operation, of the indoor heat exchanger (31) and the radiant heat exchanger (52), only the radiant heat exchanger (52) performs the heating operation.
　第５動作では、輻射熱交換器（52）に対応する輻射膨張弁（51）が開放される。輻射膨張弁（51）の開度は、輻射熱交換器（52）を流出した冷媒の過冷却度ＳＣ２に基づいて制御される。第５動作では、室内ユニット（30）に対応する室内膨張弁（32）の開度が全閉、又は微小開度に制御される。ここでいう「微小開度」は、室内熱交換器（31）で実質的に暖房動作が行われない程度の開度である。第５動作では、室内ファン（33）が停止する。 In the fifth operation, the radiation expansion valve (51) corresponding to the radiation heat exchanger (52) is opened. The opening degree of the radiation expansion valve (51) is controlled based on the degree of subcooling SC2 of the refrigerant flowing out of the radiation heat exchanger (52). In the fifth operation, the opening degree of the indoor expansion valve (32) corresponding to the indoor unit (30) is controlled to be fully closed or slightly open. The "small opening degree" referred to here is an opening degree at which the heating operation is not substantially performed by the indoor heat exchanger (31). In the fifth operation, the indoor fan (33) is stopped.
　第５動作中の冷媒回路（11）では、輻射熱交換器（52）を凝縮器ないし放熱器とし、室外熱交換器（22）を蒸発器とし、室内熱交換器（31）を停止させる冷凍サイクルが行われる。 In the refrigerant circuit (11) in the fifth operation, the radiation heat exchanger (52) is a condenser or a radiator, the outdoor heat exchanger (22) is an evaporator, and the refrigeration cycle for stopping the indoor heat exchanger (31) Is done.
　第６動作では、室内ユニット（30）及び輻射パネル（40）が暖房動作を行う。換言すると、第６動作では、室内熱交換器（31）及び輻射熱交換器（52）が暖房動作を行う。 In the sixth operation, the indoor unit (30) and the radiation panel (40) perform a heating operation. In other words, in the sixth operation, the indoor heat exchanger (31) and the radiant heat exchanger (52) perform the heating operation.
　第６動作では、室内熱交換器（31）に対応する室内膨張弁（32）が開放される。室内膨張弁（32）の開度は、室内熱交換器（31）を流出した冷媒の過冷却度ＳＣ１に基づいて制御される。第６動作では、輻射熱交換器（52）に対応する輻射膨張弁（51）が開放される。輻射膨張弁（51）の開度は、輻射熱交換器（52）を流出した冷媒の過冷却度ＳＣ２に基づいて制御される。第６動作では、室内ファン（33）が運転される。 In the sixth operation, the indoor expansion valve (32) corresponding to the indoor heat exchanger (31) is opened. The degree of opening of the indoor expansion valve (32) is controlled based on the degree of supercooling SC1 of the refrigerant flowing out of the indoor heat exchanger (31). In the sixth operation, the radiation expansion valve (51) corresponding to the radiation heat exchanger (52) is opened. The opening degree of the radiation expansion valve (51) is controlled based on the degree of subcooling SC2 of the refrigerant flowing out of the radiation heat exchanger (52). In the sixth operation, the indoor fan (33) is operated.
　第６動作の冷媒回路（11）では、室内熱交換器（31）及び輻射熱交換器（52）を凝縮器ないし放熱器とし、室外熱交換器（22）を蒸発器とする冷凍サイクルが行われる。 In the refrigerant circuit (11) of the sixth operation, a refrigeration cycle is performed in which the indoor heat exchanger (31) and the radiant heat exchanger (52) are a condenser or a radiator and the outdoor heat exchanger (22) is an evaporator. .
　暖房運転では、室内の暖房負荷を示す指標に基づいて、第４動作、第５動作、及び第６動作が切り換えられる。空気調和装置（10）は、室内の暖房負荷を示す指標に基づいて、第４動作、第５動作、及び第６動作を切り換える制御部を備える。制御部は、上述した室内コントローラ（C1）及び輻射コントローラ（C2）を含む。暖房負荷を示す指標は、設定温度Ｔsと室内温度Ｔｒの差（Ｔｓ－Ｔｒ）である。室内温度センサ（71）は、暖房負荷を検出する負荷検出部を構成する。暖房負荷を示す指標はこれに限られない。 In the heating operation, the fourth operation, the fifth operation, and the sixth operation are switched based on the index indicating the heating load in the room. The air conditioner (10) includes a control unit that switches the fourth operation, the fifth operation, and the sixth operation based on the index indicating the heating load in the room. The control unit includes the indoor controller (C1) and the radiation controller (C2) described above. The index indicating the heating load is the difference (Ts−Tr) between the set temperature Ts and the indoor temperature Tr. The indoor temperature sensor (71) constitutes a load detection unit that detects a heating load. The index indicating the heating load is not limited to this.
　空気調和装置（10）は、暖房運転の開始時において第６動作を行う。第６動作では、室内ユニット（30）及び輻射パネル（40）が暖房動作を行う。この第６動作により、室内の暖房負荷を速やかに低減できる。 The air conditioner (10) performs the sixth operation at the start of the heating operation. In the sixth operation, the indoor unit (30) and the radiation panel (40) perform a heating operation. By the sixth operation, the heating load in the room can be rapidly reduced.
　第６動作中において、室内の暖房負荷が所定値よりも低くなる条件が成立すると、第６動作から第５動作に切り換わる。第５動作では、輻射パネル（40）のみが暖房動作を行う。この第５動作により、室内温度が過剰に高くなることを抑制できる。加えて、室内ユニット（30）から吹き出される温風が在室者にあたることを確実に回避できる。 During the sixth operation, the sixth operation is switched to the fifth operation when a condition for the indoor heating load to fall below a predetermined value is satisfied. In the fifth operation, only the radiation panel (40) performs the heating operation. This fifth operation can suppress the room temperature from becoming excessively high. In addition, it is possible to reliably prevent the warm air blown out from the indoor unit (30) from hitting the occupants.
　第６動作は、必ずしも暖房運転の開始時のみに実行しなくてもよい。暖房運転の開始後において、室内の暖房負荷が所定値よりも高くなる条件が成立すると、第６動作が実行される。この第６動作により、室内の暖房負荷を速やかに低減できる。この場合にも、第６動作中において、室内の暖房負荷が所定値よりも低くなる条件が成立すると、第６動作から第５動作に切り換わる。第５動作では、輻射パネル（40）のみが暖房動作を行う。この第５動作により、室内温度が過剰に高くなることを抑制できる。加えて、室内ユニット（30）から吹き出される温風が在室者にあたることを確実に回避できる。 The sixth operation may not necessarily be performed only at the start of the heating operation. After the start of the heating operation, the sixth operation is performed when a condition is established in which the indoor heating load is higher than a predetermined value. By the sixth operation, the heating load in the room can be rapidly reduced. Also in this case, the sixth operation is switched to the fifth operation when the condition for the indoor heating load to fall below a predetermined value is satisfied during the sixth operation. In the fifth operation, only the radiation panel (40) performs the heating operation. This fifth operation can suppress the room temperature from becoming excessively high. In addition, it is possible to reliably prevent the warm air blown out from the indoor unit (30) from hitting the occupants.
　以上、実施形態および変形例を説明したが、特許請求の範囲の趣旨および範囲から逸脱することなく、形態や詳細の多様な変更が可能なことが理解されるであろう。また、以上の実施形態および変形例は、本開示の対象の機能を損なわない限り、適宜組み合わせたり、置換したりしてもよい。 While the embodiments and modifications have been described above, it will be understood that various changes in form and detail can be made without departing from the spirit and scope of the claims. Moreover, the above embodiments and modifications may be combined or replaced as appropriate as long as the function of the subject of the present disclosure is not impaired.
　以上説明したように、本開示は、空気調和装置について有用である。 As described above, the present disclosure is useful for an air conditioner.
　　１０　　　空気調和装置　　
　　１１　　　冷媒回路
　　１２　　　室外回路
　　１３　　　室内回路
　　１５　　　輻射回路
　　１６　　　ガス連絡配管
　　２０　　　室外ユニット
　　２１　　　圧縮機
　　２２　　　室外熱交換器
　　２２Ａ　　第１室外熱交換器
　　３０　　　室内ユニット
　　３１　　　室内熱交換器
　　３２　　　室内膨張弁（第１調節弁）
　　４０　　　輻射パネル
　　５１　　　輻射膨張弁（第２調節弁）
　　５２　　　輻射熱交換器
　　５４　　　ガス管 10 air conditioner
11 refrigerant circuit 12 outdoor circuit 13 indoor circuit 15 radiation circuit 16 gas communication piping 20 outdoor unit 21 compressor 22 outdoor heat exchanger 22A first outdoor heat exchanger 30 indoor unit 31 indoor heat exchanger 32 indoor expansion valve (first adjustment) valve)
40 radiation panel 51 radiation expansion valve (second control valve)
52 Radiation heat exchanger 54 Gas pipe

Claims (12)

  1. 　圧縮機（21）及び室外熱交換器（22,22A）が接続される室外回路（12）と、室内熱交換器（31）及び第１調節弁（32）が接続される室内回路（13）と、輻射熱交換器（52）及び第２調節弁（51）が接続される輻射回路（15）とを含む冷媒回路（11）を備えた空気調和装置であって、
    　上記冷媒回路（11）では、前記室内回路（13）と前記輻射回路（15）とが並列に接続されることを特徴とする空気調和装置。     An outdoor circuit (12) to which the compressor (21) and the outdoor heat exchanger (22, 22A) are connected, and an indoor circuit (13) to which the indoor heat exchanger (31) and the first control valve (32) are connected An air conditioner comprising: a refrigerant circuit (11) including: a radiation heat exchanger (52) and a radiation circuit (15) to which a second control valve (51) is connected,
    In the refrigerant circuit (11), the indoor circuit (13) and the radiation circuit (15) are connected in parallel.
  2. 　請求項１において、
    　前記室外回路（12）は、室外ユニット（20）に設けられ、
    　前記室内回路（13）は、室内ユニット（30）に設けられ、
    　前記輻射回路（15）は、輻射パネル（40）に設けられることを特徴とする空気調和装置。     In claim 1,
    The outdoor circuit (12) is provided to an outdoor unit (20),
    The indoor circuit (13) is provided in an indoor unit (30),
    An air conditioner characterized in that the radiation circuit (15) is provided on a radiation panel (40).
  3. 　請求項１又は２において、
    　前記冷媒回路（11）は、前記室外熱交換器（22）に接続するガス連絡配管（16）と、該ガス連絡配管（16）から分岐して前記輻射熱交換器（52）に接続するガス管（54）とを有し、
    　前記ガス管（54）の内径が、前記ガス連絡配管（16）の内径よりも小さいことを特徴とする空気調和装置。     In claim 1 or 2,
    The refrigerant circuit (11) is a gas communication pipe (16) connected to the outdoor heat exchanger (22), and a gas pipe branched from the gas communication pipe (16) and connected to the radiation heat exchanger (52) (54) and
    An air conditioner characterized in that the inner diameter of the gas pipe (54) is smaller than the inner diameter of the gas connection pipe (16).
  4. 　請求項１乃至３のいずれか１つにおいて、
    　前記冷媒回路（11）は、前記室内熱交換器（31）の少なくとも１つと、前記輻射熱交換器（52）の少なくとも１つとが放熱器となる冷凍サイクルを行うように構成されることを特徴とする空気調和装置。     In any one of claims 1 to 3,
    The refrigerant circuit (11) is configured to perform a refrigeration cycle in which at least one of the indoor heat exchangers (31) and at least one of the radiant heat exchangers (52) are a radiator. Air conditioning equipment.
  5. 　請求項１乃至４のいずれか１つにおいて、
    　前記冷媒回路（11）は、前記室内熱交換器（31）の少なくとも１つと、前記輻射熱交換器（52）の少なくとも１つとが蒸発器となる冷凍サイクルを行うように構成されることを特徴とする空気調和装置。     In any one of claims 1 to 4,
    The refrigerant circuit (11) is configured to perform a refrigeration cycle in which at least one of the indoor heat exchangers (31) and at least one of the radiant heat exchangers (52) are evaporators. Air conditioning equipment.
  6. 　請求項１乃至５のいずれか１つにおいて、
    　前記冷媒回路（11）は、前記室内熱交換器（31）及び前記輻射熱交換器（52）の一方が放熱器となり、他方が蒸発器となる冷凍サイクルを行うように構成されることを特徴とする空気調和装置。     In any one of claims 1 to 5,
    The refrigerant circuit (11) is configured to perform a refrigeration cycle in which one of the indoor heat exchanger (31) and the radiant heat exchanger (52) is a radiator and the other is an evaporator. Air conditioning equipment.
  7. 　請求項１乃至６のいずれか１つにおいて、
    　前記輻射熱交換器（52）が放熱器となる冷凍サイクル中に、該輻射熱交換器（52）の流出側の冷媒の過冷却度が所定値となるように前記第２調節弁（51）の開度を制御する制御部（C2）を備えていることを特徴とする空気調和装置。     In any one of claims 1 to 6,
    During the refrigeration cycle in which the radiant heat exchanger (52) becomes a radiator, the second control valve (51) is opened so that the degree of subcooling of the refrigerant on the outflow side of the radiant heat exchanger (52) becomes a predetermined value. An air conditioner characterized by comprising a control unit (C2) for controlling the degree.
  8. 　請求項１乃至７のいずれか１つにおいて、
    　前記輻射熱交換器（52）が蒸発器となる運転中に、該輻射熱交換器（52）の流出側の冷媒の過熱度が所定値となるように前記第２調節弁（51）の開度を制御する制御部（C2）を備えていることを特徴とする空気調和装置。     In any one of claims 1 to 7,
    While the radiant heat exchanger (52) operates as an evaporator, the opening degree of the second control valve (51) is set so that the degree of superheat of the refrigerant on the outflow side of the radiant heat exchanger (52) becomes a predetermined value. An air conditioner comprising a control unit (C2) for controlling.
  9. 　請求項２乃至８のいずれか１つにおいて、
    　前記空気調和装置全体の定格冷房能力が、７．１ｋＷ以上であることを特徴とする空気調和装置。     In any one of claims 2 to 8,
    An air conditioner characterized in that a rated cooling capacity of the entire air conditioner is 7.1 kW or more.
  10. 　請求項２において、
    　前記室内ユニット（30）及び前記輻射パネル（40）の定格能力の合計が、前記室外ユニット（20）の定格能力の５０％以上２００％以下の範囲であることを特徴とする空気調和装置。     In claim 2,
    The total of the rated capacity of the indoor unit (30) and the radiation panel (40) is in the range of 50% to 200% of the rated capacity of the outdoor unit (20).
  11. 　請求項１乃至１０のいずれか１つにおいて、
    　前記室内熱交換器（31）及び前記輻射熱交換器（52）のうち前記輻射熱交換器（52）のみで冷房動作を行う冷房運転を行うことを特徴とする空気調和装置。     In any one of claims 1 to 10,
    An air conditioner characterized by performing a cooling operation in which a cooling operation is performed only by the radiation heat exchanger (52) among the indoor heat exchanger (31) and the radiation heat exchanger (52).
  12. 　請求項１乃至１１のいずれか１つにおいて、
    　前記室内熱交換器（31）及び前記輻射熱交換器（52）のうち前記輻射熱交換器（52）のみで暖房動作を行う暖房運転を行うことを特徴とする空気調和装置。     In any one of claims 1 to 11,
    An air conditioner characterized by performing a heating operation in which a heating operation is performed only by the radiation heat exchanger (52) among the indoor heat exchanger (31) and the radiation heat exchanger (52).
PCT/JP2019/001336 2018-01-29 2019-01-17 Air conditioning device WO2019146502A1 (en)

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