WO2022049879A1 - Dispositif de climatisation - Google Patents

Dispositif de climatisation Download PDF

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Publication number
WO2022049879A1
WO2022049879A1 PCT/JP2021/024152 JP2021024152W WO2022049879A1 WO 2022049879 A1 WO2022049879 A1 WO 2022049879A1 JP 2021024152 W JP2021024152 W JP 2021024152W WO 2022049879 A1 WO2022049879 A1 WO 2022049879A1
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WO
WIPO (PCT)
Prior art keywords
heat exchanger
air conditioner
refrigerant
indoor
temperature
Prior art date
Application number
PCT/JP2021/024152
Other languages
English (en)
Japanese (ja)
Inventor
太郎 黒田
Original Assignee
ダイキン工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Priority to CN202180053138.6A priority Critical patent/CN115989387A/zh
Publication of WO2022049879A1 publication Critical patent/WO2022049879A1/fr

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    • 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
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • 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
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0067—Indoor units, e.g. fan coil units characterised by heat exchangers by the shape of the heat exchangers or of parts thereof, e.g. of their fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/48—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring prior to normal operation, e.g. pre-heating or pre-cooling
    • 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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • 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
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature

Definitions

  • Patent Document 1 Japanese Unexamined Patent Publication No. 2008-138913 discloses a technical idea of washing away dirt adhering to an indoor heat exchanger by performing a cooling operation or a dehumidifying operation after a heating operation.
  • Patent Document 1 since most of the indoor heat exchanger is used as an evaporator in the air conditioner, a large amount of dehumidification is required to wash away the dirt. However, it is difficult to obtain a large amount of dehumidification during the heating period.
  • the air conditioner of the first aspect includes a refrigerant circuit and a control unit.
  • the refrigerant circuit includes an indoor heat exchanger having a first part on the windward side and a second part on the leeward side of the first part.
  • the control unit performs a post-heating cleaning operation for cleaning the indoor heat exchanger by setting the first unit as an evaporation region after the heating operation.
  • the indoor heat exchange is performed so that the refrigerant temperature in the first part is lower than the dew point temperature of the indoor air passing through the indoor heat exchanger and the refrigerant temperature in the second part is higher than the refrigerant temperature in the first part. Controls the temperature of the refrigerant flowing through the vessel.
  • the air conditioner of the second aspect is the device of the first aspect, and in the control unit, the refrigerant temperature at the liquid side end portion of the first unit is equal to or lower than the dew point temperature of the indoor air passing through the indoor heat exchanger.
  • the temperature of the refrigerant flowing through the indoor heat exchanger is controlled so that the temperature of the refrigerant in the second part is higher than the temperature of the refrigerant in the gas side end of the first part.
  • the air conditioner of the third aspect is the device of the first aspect or the second aspect, and in the cleaning operation after heating, the first part becomes the evaporation area and the second part becomes the superheat area.
  • the air conditioner of the fourth aspect is the device of the first aspect or the second aspect, and in the post-heating cleaning operation, the first part becomes the evaporation area and the second part becomes the condensation area or the supercooling area.
  • This air conditioner can suppress the decrease in room temperature.
  • the air conditioner of the fifth viewpoint is the device of the fourth viewpoint and includes an indoor expansion mechanism.
  • the indoor expansion mechanism is provided between the first part and the second part in the refrigerant flow path of the indoor heat exchanger.
  • the air conditioner performs a cleaning operation after heating by narrowing down the indoor expansion mechanism.
  • an evaporation region and a condensation region can be formed by an expansion mechanism.
  • the air conditioner of the sixth aspect is the device of the fifth aspect, and the second part has a supercooling region in the cleaning operation after heating.
  • This air conditioner can prevent the two-phase refrigerant from flowing into the expansion mechanism.
  • the air conditioner according to the seventh aspect is the device according to the fifth or sixth aspect, and further includes a temperature sensor for detecting the temperature of the refrigerant flowing through the second part.
  • this air conditioner has a supercooled area. Therefore, it is possible to more reliably prevent the two-phase refrigerant from flowing into the expansion mechanism.
  • the air conditioner according to the eighth aspect is any of the devices from the first aspect to the seventh aspect, and the first part is arranged on the front part and / or the back part of the indoor heat exchanger.
  • the air conditioner according to the ninth aspect is any of the devices from the first aspect to the eighth aspect, and the indoor heat exchanger has a plurality of rows of heat exchangers.
  • the first part is arranged on the windward side of a plurality of rows of heat exchangers.
  • the air conditioner of the tenth viewpoint is any of the devices from the first viewpoint to the ninth viewpoint, and the first part is arranged in the indoor heat exchanger provided on the windward side of the second part.
  • the air conditioner according to the eleventh aspect is any of the devices from the first aspect to the tenth aspect, and further includes a sensor for detecting the refrigerant state of the refrigerant passing through the first part.
  • the air conditioner of the twelfth viewpoint is the device of the eleventh viewpoint, and the sensor is a temperature thermistor or a pressure sensor.
  • the air conditioner according to the thirteenth aspect is any device from the first aspect to the twelfth aspect, and the indoor heat exchanger has fins.
  • the air conditioner is configured such that the fins of the first part and the fins of the second part are separated from each other.
  • the transfer of dew condensation water or heat between the first part and the second part can be suppressed, and the cleaning effect on the windward side of the indoor heat exchanger can be enhanced.
  • the air conditioner of the 14th aspect is the device of the 13th aspect, and the fin has a slit between the first part and the second part.
  • this air conditioner the transfer of dew condensation water or heat between the first part and the second part can be suppressed, and the cleaning effect on the windward side of the indoor heat exchanger can be enhanced.
  • the air conditioner of the fifteenth viewpoint is any of the devices from the first viewpoint to the fourteenth viewpoint, and performs different cleaning operations after the cooling operation and after the heating operation.
  • the air conditioner of the 16th viewpoint is any of the devices from the 1st viewpoint to the 14th viewpoint, and performs different cleaning operations based on the indoor humidity.
  • the air conditioner 1 causes dew condensation on the wind side of the indoor heat exchanger after the heating operation, and cleans the indoor heat exchanger.
  • the air conditioning device 1 includes an air conditioning outdoor unit 2 and an air conditioning indoor unit 10.
  • the air conditioner 1 includes a refrigerant circuit 100 filled with a refrigerant.
  • the outdoor circuit portion housed in the air conditioning outdoor unit 2 and the indoor circuit section housed in the air conditioning indoor unit 10 are connected by the gas side connecting pipe 117a and the liquid side connecting pipe 117b. It is configured.
  • a compressor 101, a four-way switching valve 102, an outdoor heat exchanger 103, and an expansion valve 104 are connected to the outdoor circuit portion of the air conditioner outdoor unit 2.
  • the discharge side of the compressor 101 is connected to the first port P1 of the four-way switching valve 102.
  • the suction side of the compressor 101 is connected to the third port P3 of the four-way switching valve 102 with the accumulator 120 interposed therebetween.
  • the accumulator 120 separates the liquid refrigerant and the gas refrigerant.
  • the outdoor heat exchanger 103 is a cross-fin type fin-and-tube heat exchanger.
  • An outdoor fan 123 for sending outdoor air to the outdoor heat exchanger 103 is provided in the vicinity of the outdoor heat exchanger 103.
  • One end side of the outdoor heat exchanger 103 is connected to the fourth port P4 of the four-way switching valve 102.
  • the other end of the outdoor heat exchanger 103 is connected to an expansion valve 104, which is a depressurizing means.
  • the expansion valve 104 is an electric expansion valve having a variable opening degree.
  • the four-way switching valve 102 has a first state (state shown by a solid line in FIG. 1) in which the first port P1 and the fourth port P4 communicate with each other and the second port P2 and the third port P3 communicate with each other, and a first state. It is possible to switch between the second state (the state shown by the dotted line in FIG. 1) in which the port P1 and the second port P2 communicate with each other and the third port P3 and the fourth port P4 communicate with each other.
  • the second port P2 of the four-way switching valve 102 is connected to the indoor heat exchanger 13 via the gas side connecting pipe 117a.
  • an auxiliary heat exchanger 13a and a main heat exchanger 13b are connected to the indoor circuit portion.
  • the auxiliary heat exchanger 13a and the main heat exchanger 13b are cross-fin type fin-and-tube heat exchangers having a plurality of fins 21 and a plurality of heat transfer tubes.
  • the auxiliary heat exchanger 13a and the main heat exchanger 13b are collectively referred to as an indoor heat exchanger 13.
  • An indoor fan 14 for sending indoor air to the indoor heat exchanger 13 is provided in the vicinity of the indoor heat exchanger 13.
  • FIG. 2 is a perspective view of the air conditioning indoor unit 10.
  • FIG. 3 is a cross-sectional view of the air conditioning indoor unit 10.
  • the air-conditioning indoor unit 10 includes a main body casing 11, an indoor heat exchanger 13, an indoor fan 14, a bottom frame 16, and a control unit 40.
  • Main body casing 11 The main body casing 11 has a top surface portion 11a, a front panel 11b, a back surface plate 11c, and a lower horizontal plate 11d.
  • the main body casing 11 houses an indoor heat exchanger 13, an indoor fan 14, a bottom frame 16, a filter 24, and a control unit 40 inside.
  • the top surface portion 11a is located at the upper part of the main body casing 11, and the suction port 12 is provided at the front portion of the top surface portion 11a.
  • the front panel 11b constitutes the front portion of the air conditioning indoor unit 10 and has a curved shape without a suction opening.
  • a filter 24 is arranged between the suction port 12 and the indoor heat exchanger 13. The filter 24 removes dust contained in the air sucked from the suction port 12.
  • the indoor heat exchanger 13 has an auxiliary heat exchanger 13a composed of one row of heat exchangers and a main heat exchanger 13b composed of a plurality of rows of heat transfer tubes. Refrigerant is flowing inside the indoor heat exchanger 13. The indoor heat exchanger 13 exchanges heat between the refrigerant flowing inside and the air passing through the indoor heat exchanger 13.
  • the main heat exchanger 13b has an inverted V-shape in which both ends are bent downward in a side view.
  • the front main heat exchanger 13b is referred to as a front main heat exchanger 13ba
  • the rear main heat exchanger 13b is referred to as a rear main heat exchanger 13bb.
  • the auxiliary heat exchanger 13a is arranged in front of the front main heat exchanger 13ba.
  • the auxiliary heat exchangers arranged on the front side are placed on the front side auxiliary heat exchanger 13aa and the back side.
  • the arranged auxiliary heat exchanger may be referred to as a rear side auxiliary heat exchanger 13ab.
  • the left side of the cross-sectional view of FIG. 3 is the front side of the air conditioner indoor unit 10
  • the right side of the cross-sectional view of FIG. 3 is the back side of the air conditioner indoor unit 10.
  • the indoor heat exchanger 13 has a first part on the windward side and a second part on the leeward side of the first part. Details will be described later.
  • FIG. 5 shows the air flow generated by the indoor fan 14 and the refrigerant flow path of the refrigerant flowing through the indoor heat exchanger 13.
  • FIG. 5 shows a refrigerant flow path during the cleaning operation described later. More specifically, the refrigerant flow path during the operation of the second dehumidifying operation performed in the washing operation is shown.
  • the liquid refrigerant flows from the expansion valve 104 of the air conditioning outdoor unit 2 to the indoor heat exchanger 13.
  • the refrigerant flowing from the expansion valve 104 is supplied to the indoor heat exchanger 13 from the first inlet 131 arranged near the lower end of the auxiliary heat exchanger 13a, and the refrigerant supplied from the first inlet 131 is auxiliary. It flows toward the upper end of the heat exchanger 13a. Then, the refrigerant flows out from the first outlet 151 arranged near the upper end of the auxiliary heat exchanger 13a. The refrigerant flowing out from the first outlet 151 enters the branch portion 145.
  • the expansion valve 104 is connected to the outdoor circuit portion of the air conditioner outdoor unit 2 and exists at a position away from the air conditioner indoor unit 10. However, here, for convenience of explanation, the expansion valve 104 is shown in FIG. 5, which is a diagram relating to the air conditioning indoor unit 10. Further, also in FIGS. 7 and 8 described later, for convenience of explanation, the expansion valve 104 existing at a position away from the air conditioning indoor unit 10 is shown.
  • the refrigerant that has entered the branch portion 145 is branched at the branch portion 145.
  • the refrigerant branched at the branch portion 145 is supplied to the front main heat exchanger 13ba and the rear main heat exchanger 13bb from the second inlet 134 and the third inlet 137 of the main heat exchanger 13b. After that, the refrigerant flows out from the second outlet 135 and the third outlet 138 of the main heat exchanger 13b, and merges at the merging portion 136.
  • the refrigerant merged at the merging portion 136 flows out from the indoor heat exchanger 13.
  • the indoor fan 14 is located below the indoor heat exchanger 13.
  • the indoor fan 14 is a cross-flow fan, and air taken in from the room is sent to the indoor heat exchanger 13.
  • the indoor air that has passed through the indoor heat exchanger 13 is blown into the room from the outlet 15.
  • the indoor fan 14 and the indoor heat exchanger 13 are attached to the bottom frame 16.
  • Wind direction adjusting blade 31 In the air conditioner 1 according to the present embodiment, the air outlet 15 is provided at the lower part of the main body casing 11. A wind direction adjusting blade 31 that changes the direction of the air blown from the air outlet 15 is rotatably attached to the air outlet 15. The wind direction adjusting blade 31 is driven by a motor (not shown). The wind direction adjusting blade 31 can not only change the blowing direction of air, but also open and close the air outlet 15. The wind direction adjusting blade 31 can take a plurality of postures having different inclination angles.
  • outlet flow path 18 is formed from the outlet 15 along the scroll 17 of the bottom frame 16.
  • the outlet 15 is connected to the inside of the main body casing 11 by the outlet flow path 18.
  • the indoor air is sucked into the indoor fan 14 via the suction port 12 and the indoor heat exchanger 13 by the operation of the indoor fan 14, and is blown out from the indoor fan 14 through the outlet flow path 18 and from the outlet 15.
  • Control unit 40 The control unit 40 is located on the right side of the indoor heat exchanger 13 and the indoor fan 14 when the main body casing 11 is viewed from the front panel 11b.
  • the control unit 40 is realized by a computer.
  • the control unit 40 includes a control arithmetic unit and a storage device.
  • FIG. 4 is a block diagram showing a schematic configuration of the control unit 40.
  • the control unit 40 includes a cooling operation control unit 42, a heating operation control unit 43, a dehumidification operation control unit 44, and a cleaning operation control unit 45.
  • the dehumidifying operation control unit 44 includes a first dehumidifying operation control unit 46 and a second dehumidifying operation control unit 47.
  • the control unit 40 receives various information from the evaporation temperature sensor 105, the indoor heat exchange temperature sensor 106, the indoor temperature sensor 107, the humidity sensor 108, the temperature thermistor 109, and the heat exchange intermediate thermistor 160.
  • the control unit 40 controls each unit constituting the air conditioner 1, such as the indoor fan 14, the compressor 101, the four-way switching valve 102, and the expansion valve 104.
  • a processor such as a CPU or GPU can be used as the control arithmetic unit.
  • the control arithmetic unit reads a program stored in the storage device and performs a predetermined arithmetic processing according to this program. Further, the control arithmetic unit can write the arithmetic result to the storage device and read the information stored in the storage device according to the program.
  • the storage device can be used as a database.
  • the evaporation temperature sensor 105 is attached to the downstream piping of the expansion valve 104 when viewed from the outdoor heat exchanger 103 side.
  • the evaporation temperature sensor 105 detects the evaporation temperature. In other words, the evaporation temperature sensor 105 detects the temperature of the refrigerant decompressed by the expansion valve 104.
  • the air conditioner 1 includes a temperature thermistor 109 for detecting the refrigerant state of the refrigerant flowing through the first part (for example, the auxiliary heat exchanger 13a).
  • the temperature thermistor 109 is, but is not limited to, arranged in a pipe between the auxiliary heat exchanger 13a and the main heat exchanger 13b (see FIG. 5).
  • the evaporation temperature sensor 105 is attached to the downstream pipe of the expansion valve 104, and the temperature thermistor 109 is placed in the pipe between the auxiliary heat exchanger 13a and the main heat exchanger 13b to control the control unit.
  • Reference numeral 40 can confirm the state of the refrigerant at the liquid side end portion and the gas side end portion of the auxiliary heat exchanger 13a. Thereby, the control unit 40 can confirm whether or not the entire area of the auxiliary heat exchanger 13a having the first unit functions as an evaporation region.
  • the arrangement position and quantity of the temperature thermistor 109 are not limited to the embodiment of the present embodiment, and can be appropriately changed.
  • the temperature thermistor 109 may be realized by a plurality of sensors.
  • the indoor heat exchange temperature sensor 106 is arranged in the main heat exchanger 13b.
  • the indoor heat exchange temperature sensor 106 detects the temperature of the refrigerant flowing through the main heat exchanger 13b. More specifically, the indoor heat exchange temperature sensor 106 is arranged in the front main heat exchanger 13ba and detects the refrigerant temperature of the refrigerant flowing through the front main heat exchanger 13ba (see FIG. 5). Therefore, the temperature detected by the indoor heat exchange temperature sensor 106 is higher than the temperature detected by the temperature thermistor 109, so that the control unit 40 has an overheated area downstream of the indoor heat exchange temperature sensor 106. It can detect that it is there.
  • the arrangement position and quantity of the indoor heat exchange temperature sensor 106 are not limited to the embodiment of the present embodiment, and can be appropriately changed.
  • an indoor temperature sensor 107 is arranged behind the slit 11e (see FIG. 2) on the side surface of the main body casing 11.
  • the indoor temperature sensor 107 detects the indoor temperature.
  • a humidity sensor 108 as a humidity detecting means is arranged in the vicinity of the indoor temperature sensor 107.
  • the heat exchange intermediate thermistor 160 is arranged in the main heat exchanger 13b.
  • the heat exchange intermediate thermistor 160 detects the temperature of the refrigerant flowing through the main heat exchanger 13b (see FIG. 5).
  • the heat exchange intermediate thermistor 160 detects the evaporation temperature of the indoor heat exchanger 13 when the air conditioner 1 performs the cooling operation.
  • the heat exchange intermediate thermistor 160 detects the condensation temperature of the indoor heat exchanger 13 when the air conditioner 1 performs the heating operation.
  • the flow of the refrigerant can be switched to either the first cycle or the second cycle by the four-way switching valve 102. Further, in the air conditioning device 1 according to the present embodiment, various operations can be executed under the control of the cooling operation control unit 42, the heating operation control unit 43, the dehumidification operation control unit 44, and the cleaning operation control unit 45.
  • Cooling operation In the air conditioning device 1 according to the present embodiment, it is possible to execute a cooling operation which is an operation for cooling the air-conditioned space.
  • the operation of the air conditioner 1 during the cooling operation is controlled by the cooling operation control unit 42.
  • the flow of the refrigerant during the cooling operation is the first cycle.
  • the four-way switching valve 102 In the first cycle, the four-way switching valve 102 is set to the first state (solid line in FIG. 1).
  • a steam compression refrigeration cycle is performed in which the outdoor heat exchanger 103 serves as a condenser and the auxiliary heat exchanger 13a and the main heat exchanger 13b serve as evaporators in the refrigerant circuit 100.
  • the high-pressure refrigerant discharged from the compressor 101 exchanges heat with the outdoor air in the outdoor heat exchanger 103 and condenses.
  • the refrigerant that has passed through the outdoor heat exchanger 103 is decompressed when passing through the expansion valve 104, and then heat exchanges with the indoor air in the auxiliary heat exchanger 13a and the main heat exchanger 13b to evaporate.
  • the refrigerant that has passed through the auxiliary heat exchanger 13a and the main heat exchanger 13b is sucked into the compressor 101 and compressed again.
  • (5-2) Heating operation In the air conditioning device 1 according to the present embodiment, it is possible to execute a heating operation which is an operation for heating the air-conditioned space.
  • the operation of the air conditioner 1 during the heating operation is controlled by the heating operation control unit 43.
  • the flow of the refrigerant during the heating operation is the second cycle.
  • the four-way switching valve 102 In the second cycle, the four-way switching valve 102 is set to the second state (dotted line in FIG. 1). Then, when the compressor 101 is operated in the second state, a steam compression refrigeration cycle is performed in which the outdoor heat exchanger 103 serves as an evaporator and the auxiliary heat exchanger 13a and the main heat exchanger 13b serve as condensers in the refrigerant circuit 100. ..
  • the high-pressure refrigerant discharged from the compressor 101 exchanges heat with the room air in the auxiliary heat exchanger 13a and the main heat exchanger 13b and condenses.
  • the condensed refrigerant is decompressed when passing through the expansion valve 104, and then heat exchanges with the outdoor air in the outdoor heat exchanger 103 to evaporate.
  • the refrigerant that has passed through the outdoor heat exchanger 103 is sucked into the compressor 101 and compressed again.
  • the air conditioning device 1 it is possible to execute a dehumidifying operation which is an operation for dehumidifying the air-conditioned space.
  • the operation of the air conditioner 1 during the dehumidifying operation is controlled by the dehumidifying operation control unit 44.
  • the flow of the refrigerant during the dehumidifying operation is the first cycle, similar to the flow of the refrigerant during the cooling operation.
  • the dehumidifying operation includes a first dehumidifying operation and a second dehumidifying operation.
  • the auxiliary heat exchanger 13a and the main heat exchanger 13b are in the evaporation region.
  • dew condensation water is generated on the surfaces of the auxiliary heat exchanger 13a and the main heat exchanger 13b.
  • dew condensation water is generated on the entire surface of the indoor heat exchanger 13.
  • the auxiliary heat exchanger 13a becomes the evaporation region.
  • dew condensation water is generated on the surface of the auxiliary heat exchanger 13a.
  • the air conditioning device 1 is an operation for cleaning the indoor heat exchanger 13 by setting the first part as an evaporation region after the heating operation. You can drive.
  • the operation of the air conditioner 1 during the cleaning operation after heating is controlled by the cleaning operation control unit 45.
  • the flow of the refrigerant during the cleaning operation after heating is the first cycle, similar to the flow of the refrigerant during the cooling operation.
  • the second dehumidifying operation is performed, so that the first part becomes an evaporation region and the second part becomes an overheating region.
  • the processing flow shown in FIG. 6 is merely an example, and may be appropriately changed as long as there is no contradiction.
  • other steps may be included before and after each step, and the order of each step may be appropriately changed within a range that does not contradict each other.
  • step S1 of FIG. 6 the cleaning operation control unit 45 determines whether or not there is a cleaning operation command from the remote controller or the like, proceeds to step S2 if there is a cleaning operation command, and waits if there is no cleaning operation command. And continue to judge whether there is a cleaning operation command.
  • the cleaning operation control unit 45 executes the second dehumidifying operation in step S4.
  • the suction port 12 is provided in the front portion of the top surface portion 11a, so that the room is indoors. Dirt may be concentrated on the auxiliary heat exchanger 13a located on the windward side of the heat exchanger 13.
  • the first part is arranged in the auxiliary heat exchanger 13a, and the second part is mostly the front side main heat exchanger 13ba and the rear side main heat exchanger 13bb. Place in.
  • the configurations of the first part and the second part are not limited to this, and can be changed as appropriate.
  • the cleaning operation control unit 45 narrows the opening degree of the expansion valve 104, and the refrigerant temperature of the refrigerant flowing through the first unit (auxiliary heat exchanger 13a) is sucked by the suction port 12 to exchange indoor heat.
  • the compressor 101 and the expansion valve 104 are controlled so that the temperature is equal to or lower than the dew point temperature of the indoor air passing through the vessel 13.
  • the cleaning operation control unit 45 compresses the refrigerant temperature of the refrigerant flowing through the second part (front side main heat exchanger 13ba and rear side main heat exchanger 13bb) so as to be higher than the refrigerant temperature in the first part. It controls the machine 101 and the expansion valve 104.
  • the cleaning operation control unit 45 lowers the frequency of the compressor 101 and narrows the opening degree of the expansion valve 104 as necessary to reduce the front main heat exchanger 13ba and the rear main heat exchanger 13bb. Most of the is controlled to be in the overheated region.
  • the cleaning operation control unit 45 controls the compressor 101 and the expansion valve 104 so that the auxiliary heat exchanger 13a is in the evaporation region.
  • the superheated region refers to a region in the indoor heat exchanger 13 through which the superheated refrigerant flows.
  • the evaporation region refers to a region in the indoor heat exchanger 13 in which the refrigerant flows while evaporating.
  • the cleaning operation control unit 45 uses the first part of the indoor heat exchanger 13 as the evaporation region and the second part as the superheat region. As a result, it is possible to cause dew condensation mainly in the first part while suppressing the occurrence of dew condensation in the second part. Therefore, the indoor heat exchanger 13 can be suitably cleaned with a small amount of dehumidification. Further, the cleaning operation control unit 45 sets the first portion of the indoor heat exchanger 13 as the evaporation region and the second portion as the superheat region, so that the refrigerant temperature at the liquid side end portion of the first portion is the dew point of the indoor air. It becomes lower than the temperature, and the refrigerant temperature in the second part becomes higher than the refrigerant temperature in the gas side end portion of the first part.
  • the washing operation control unit 45 sets the second unit as a superheat region, so that the evaporation capacity of the indoor heat exchanger 13 is suppressed. As a result, the decrease in room temperature of the air-conditioned space is suppressed.
  • step S5 the cleaning operation control unit 45 determines whether or not the difference between the current humidity of the air-conditioned space and the target humidity is a predetermined value h2 or more, and when the difference is a predetermined value h2 or more. Proceeds to step S6, and when the difference is less than the predetermined value h2, the second dehumidifying operation of step S4 is continued.
  • step S6 the cleaning operation control unit 45 determines whether or not there is a cleaning operation stop command, and if there is a cleaning operation stop command, the process proceeds to step S10 to stop the cleaning operation, and if there is no cleaning operation stop command, step S7.
  • the first dehumidifying operation is executed. In other words, when the cleaning operation control unit 45 determines that it is possible to clean the entire indoor heat exchanger 13 due to an increase in humidity or the like, the second cleaning operation control unit 45 confirms that there is no cleaning operation stop command. Switch from the dehumidifying operation to the first dehumidifying operation.
  • the cleaning operation control unit 45 executes the first dehumidifying operation in step S7, determines in step S8 whether or not the difference between the current humidity and the target humidity is less than the predetermined value h3, and the difference is less than the predetermined value h3. In the case of, the process proceeds to step S9, and when the difference is equal to or greater than the predetermined value h3, the first dehumidifying operation in step S7 is continued.
  • the cleaning operation control unit 45 determines in step S9 whether or not there is a cleaning operation stop command, proceeds to step S10 to stop the cleaning operation if there is a cleaning operation stop command, and steps S4 if there is no cleaning operation stop command.
  • the second dehumidifying operation is executed. In other words, when the washing operation control unit 45 determines that the humidity has dropped to a state where the room temperature of the air-conditioned space may be excessively lowered by continuing the first dehumidifying operation, the washing operation stop command is issued. After confirming that there is no such thing, the first dehumidifying operation is switched to the second dehumidifying operation. In this way, the air conditioner 1 can suitably clean the indoor heat exchanger 13.
  • the air conditioner 1 includes a refrigerant circuit 100 and a control unit 40.
  • the refrigerant circuit 100 includes an indoor heat exchanger 13 having a first part on the windward side and a second part on the leeward side of the first part.
  • the control unit performs a post-heating cleaning operation for cleaning the indoor heat exchanger 13 by setting the first unit as an evaporation region after the heating operation.
  • the temperature of the refrigerant in the first part is lower than the dew point temperature of the indoor air passing through the indoor heat exchanger 13, and the temperature of the refrigerant in the second part is higher than the temperature of the refrigerant in the first part.
  • the temperature of the refrigerant flowing through the heat exchanger 13 is controlled.
  • the first part is arranged in the auxiliary heat exchanger 13a.
  • the second part is arranged in most of the main heat exchangers 13b (front main heat exchanger 13ba and rear main heat exchanger 13bb).
  • the auxiliary heat exchanger 13a is on the windward side, and the ventilation amount in the auxiliary heat exchanger 13a may increase. Conceivable. Therefore, dirt may be concentrated on the auxiliary heat exchanger 13a.
  • the refrigerant temperature of the refrigerant flowing through the first unit becomes lower than the dew point temperature of the indoor air that is sucked by the suction port 12 and passes through the indoor heat exchanger 13.
  • the compressor 101 and the expansion valve 104 are controlled.
  • the control unit 40 controls the compressor 101 and the expansion valve 104 so that the refrigerant temperature of the refrigerant flowing in the second unit is higher than the refrigerant temperature in the first unit.
  • the control unit 40 controls the refrigerant temperature in the second unit to be higher than the dew point temperature of the air sucked by the suction port 12.
  • the second part suppresses the formation of dew condensation, and the first part causes dew condensation, so that the amount of dehumidification in the first part is secured, and the indoor heat exchanger 13 is used. Evaporation capacity is suppressed. Therefore, in the air conditioner 1 according to the present embodiment, it is possible to suppress a decrease in room temperature.
  • the refrigerant temperature at the liquid side end portion of the first unit becomes equal to or lower than the dew point temperature of the indoor air passing through the indoor heat exchanger 13, and the refrigerant in the second unit
  • the temperature of the refrigerant flowing through the indoor heat exchanger 13 is controlled so that the temperature is higher than the temperature of the refrigerant at the gas side end of the first part.
  • the air conditioner 1 it is possible to more reliably suppress the formation of dew condensation in the second part and more reliably cause the dew condensation in the first part. Therefore, it is possible to suitably clean the area where dirt may be concentrated in the indoor heat exchanger 13 with a small amount of dehumidification. Therefore, the indoor heat exchanger 13 can be suitably cleaned even during the heating period when it is difficult to obtain a large amount of dehumidification.
  • control unit 40 of the air conditioner 1 in the cleaning operation after heating, the compressor 101 and the expansion valve so that the first part becomes the evaporation region and the second part becomes the superheat region. Control 104.
  • the air conditioner 1 it is possible to more reliably suppress the formation of dew condensation in the second part and more reliably cause the dew condensation in the first part. Therefore, it is possible to suitably clean the area where dirt may be concentrated in the indoor heat exchanger 13 with a small amount of dehumidification. Therefore, the indoor heat exchanger 13 can be suitably cleaned even during the heating period when it is difficult to obtain a large amount of dehumidification.
  • the first part is arranged on the front portion of the indoor heat exchanger 13.
  • the auxiliary heat exchanger 13a is on the windward side, and the ventilation amount in the auxiliary heat exchanger 13a may increase. Conceivable. Therefore, dirt may be concentrated on the auxiliary heat exchanger 13a, which is the front portion of the indoor heat exchanger 13.
  • the control unit 40 of the air conditioner 1 has the first part as the front portion of the indoor heat exchanger 13 which is an area where dirt may concentrate (in the present embodiment, the auxiliary heat exchanger 13a). It is placed in. Therefore, it is possible to suitably clean the area where dirt may be concentrated in the indoor heat exchanger 13 with a small amount of dehumidification. Therefore, the indoor heat exchanger 13 can be suitably cleaned even during the heating period when it is difficult to obtain a large amount of dehumidification.
  • the first part is arranged on the front portion of the indoor heat exchanger 13, but the present invention is not limited to this.
  • the indoor heat exchanger 13 does not have the auxiliary heat exchanger 13a
  • the first part is arranged on the front portion of the front main heat exchanger 13ba, the front portion of the rear main heat exchanger 13bb, or both. It may be something that is done.
  • the indoor heat exchanger 13 has a plurality of rows of heat exchangers.
  • the first part is arranged on the windward side of a plurality of rows of heat exchangers.
  • the plurality of rows of indoor heat exchangers are the main heat exchangers 13b.
  • the first part is arranged in the auxiliary heat exchanger 13a located on the windward side of the main heat exchanger 13b.
  • the first part is arranged in the indoor heat exchanger 13 provided on the windward side of the second part.
  • the second part is arranged in the main heat exchanger 13b.
  • the first part is arranged in the auxiliary heat exchanger 13a, which is an indoor heat exchanger provided on the windward side of the second part.
  • the indoor heat exchanger 13 can be suitably cleaned.
  • the indoor heat exchanger when the indoor heat exchanger is composed of a plurality of heat exchangers such as a main heat exchanger and an auxiliary heat exchanger, a gap is provided between the main heat exchanger and the auxiliary heat exchanger. Is possible.
  • the auxiliary heat exchanger 13a among the indoor heat exchangers 13, the auxiliary heat exchanger 13a is controlled by the control unit 40 so that the auxiliary heat exchanger 13a is in the evaporation region and most of the main heat exchanger 13b is in the non-evaporation region. Therefore, heat transfer between the evaporated region and the non-evaporated region can be suppressed. As a result, it is possible to more reliably suppress the formation of dew condensation in the second part and more reliably cause the dew condensation in the first part.
  • the indoor heat exchanger 13 can be suitably cleaned even during the heating period when it is difficult to obtain a large amount of dehumidification.
  • the air conditioner 1 further includes a temperature thermistor 109 for detecting the refrigerant state of the refrigerant passing through the first part.
  • the air conditioner 1 according to the present embodiment is provided with the temperature thermistor 109, so that the refrigerant temperature of the refrigerant passing through the auxiliary heat exchanger 13a can be detected. Further, in the air conditioner 1 according to the present embodiment, the evaporation temperature sensor 105 is attached to the downstream pipe of the expansion valve 104 as described above.
  • the auxiliary heat exchanger 13a It is possible to detect the refrigerant state of the refrigerant passing through the liquid side end portion and the gas side end portion of the above. This makes it possible to more reliably detect whether or not the entire area of the auxiliary heat exchanger 13a functions as an evaporation region. Therefore, the air conditioner 1 according to the present embodiment can more reliably cause dew condensation in the auxiliary heat exchanger 13a. Therefore, the indoor heat exchanger 13 can be suitably cleaned even during the heating period when it is difficult to obtain a large amount of dehumidification.
  • the first dehumidification operation and the second dehumidification operation are switched based on the indoor humidity.
  • the indoor heat exchanger 13 becomes dirty. Clean areas where there is a risk of concentration.
  • the air conditioner 1 can suitably clean the indoor heat exchanger 13.
  • the auxiliary heat exchanger 13a has a front side auxiliary heat exchanger 13aa and a rear side auxiliary heat exchanger 13ab.
  • the front auxiliary heat exchanger 13aa is arranged in front of the front main heat exchanger 13ba (upwind side).
  • the rear side auxiliary heat exchanger 13ab is arranged behind (windward side) the rear side main heat exchanger 13bb.
  • the first part is arranged in the front side auxiliary heat exchanger 13aa and the rear side auxiliary heat exchanger 13ab.
  • FIG. 7 shows the refrigerant flow path of the indoor heat exchanger 13 related to the air conditioner of Modification 1A.
  • the liquid refrigerant flows from the expansion valve 104 to the indoor heat exchanger 13.
  • the refrigerant flowing through the indoor heat exchanger 13 flows to the first inlet 131 arranged near the lower end of the front auxiliary heat exchanger 13aa.
  • the refrigerant flowing to the first inlet 131 flows so as to approach the upper end of the front auxiliary heat exchanger 13aa.
  • the refrigerant flowing toward the upper end of the front auxiliary heat exchanger 13aa flows out from the first outlet 151 arranged near the upper end of the front auxiliary heat exchanger 13aa.
  • the refrigerant is supplied from the fourth inlet 139 arranged near the lower end of the rear auxiliary heat exchanger 13ab and flows toward the upper end of the rear auxiliary heat exchanger 13ab. Then, the refrigerant flows out from the fourth outlet 154 arranged near the upper end of the rear side auxiliary heat exchanger 13ab. The refrigerant flowing out from the fourth outlet 154 enters the branch portion 145.
  • the refrigerant branched at the branch portion 145 is supplied to the front main heat exchanger 13ba and the rear main heat exchanger 13bb from the second inlet 134 and the third inlet 137 of the main heat exchanger 13b. After that, the refrigerant flows out from the second outlet 135 and the third outlet 138 of the main heat exchanger 13b, and merges at the merging portion 136. The refrigerant merged at the merging portion 136 flows out from the indoor heat exchanger 13.
  • the front auxiliary heat exchanger 13aa and the rear auxiliary heat exchanger 13ab are evaporation regions. Most of the front main heat exchanger 13ba arranged on the leeward side of the front auxiliary heat exchanger 13aa and the rear main heat exchanger 13bb arranged on the leeward side of the rear auxiliary heat exchanger 13ab are in the superheat region. Become.
  • the air conditioner according to the modified example 1A preferably cleans the indoor heat exchanger 13 even during the heating period when it is difficult to obtain a large amount of dehumidification. Can be done.
  • the front auxiliary heat exchanger 13aa is on the wind side of the front main heat exchanger 13ba
  • the rear auxiliary heat exchanger 13ab is on the wind side of the rear main heat exchanger 13bb.
  • the front side auxiliary heat exchanger 13aa and the rear side auxiliary heat exchanger 13ab are arranged as the first part.
  • FIG. 8 shows the refrigerant flow path of the indoor heat exchanger 13 according to the modified example 1B.
  • the refrigerant supplied from the fifth inlet 141 flows out from the fifth outlet 171.
  • the refrigerant flowing out from the fifth outlet 171 enters the sixth inlet 161 of the auxiliary heat exchanger 13a, flows out from the sixth outlet 162, and enters the branch portion 145.
  • the refrigerant branched at the branch portion 145 is supplied to the front main heat exchanger 13ba and the rear main heat exchanger 13bb from the second inlet 134 and the third inlet 137 of the main heat exchanger 13b. After that, the refrigerant flows out from the second outlet 135 and the third outlet 138, and merges at the merging portion 136. The refrigerant merged at the merging portion 136 flows out from the indoor heat exchanger 13.
  • the first part is arranged in a part of the auxiliary heat exchanger 13a.
  • dew condensation is mainly generated on a part of the auxiliary heat exchanger 13a.
  • the indoor heat exchanger 13 can be suitably cleaned even when it is more difficult to obtain the dehumidified amount.
  • the modified example 1B since the evaporation capacity of the indoor heat exchanger 13 is further suppressed, the decrease in room temperature is further suppressed.
  • the air conditioner may further include a humidifying unit (not shown).
  • the air-conditioning indoor unit may have an outlet of the humidifying unit inside the main body casing 11.
  • a humidifying unit may be further installed in the air-conditioned space in which the air-conditioned indoor unit is installed, and the air-conditioned indoor unit may be controlled to perform a cleaning operation in conjunction with the humidifying unit.
  • the air conditioner according to this modification can suitably clean the indoor heat exchanger 13 by using the moisture obtained from the humidifying unit even when the atmosphere in the air-conditioned space is dry. can.
  • the air conditioner according to the present modification can suppress a decrease in the heat exchange efficiency of the indoor heat exchanger 13 as in the air conditioner 1 according to the above embodiment.
  • the cleaning operation performed by the air conditioner according to the present disclosure is not limited to the cleaning operation after heating.
  • the air conditioner may perform a cleaning operation in which only the first dehumidifying operation is performed.
  • the air conditioner according to the modification 1E executes a heating operation and then a cleaning operation after heating. Then, after the cooling operation is executed, the washing operation in which only the first dehumidifying operation is performed is executed.
  • the air conditioner performs a post-heating cleaning operation during the heating period when it is difficult to obtain a large amount of dehumidification, and first dehumidifies during the cooling period when it is relatively easy to obtain a large amount of dehumidification. Perform only operation Perform cleaning operation.
  • the indoor heat exchanger 13 can be suitably cleaned.
  • the air conditioner 300 cleans the indoor heat exchanger 13 by executing the heating cycle reheat dehumidification operation.
  • the air conditioning device 300 includes an air conditioning outdoor unit 2 and an air conditioning indoor unit 10.
  • the air conditioner 300 includes a refrigerant circuit 100 filled with a refrigerant.
  • the outdoor circuit portion housed in the air conditioning outdoor unit 2 and the indoor circuit section housed in the air conditioning indoor unit 10 are connected by a gas side connecting pipe 117a and a liquid side connecting pipe 117b. It is composed of.
  • the air conditioning indoor unit 10 has a reheat dehumidifying valve (indoor expansion mechanism) 110 between the first part and the second part in the refrigerant flow path of the indoor heat exchanger 13. It is different from the air conditioner 1 according to the first embodiment in that it is provided.
  • the indoor heat exchanger 13 has an auxiliary heat exchanger 13a and a main heat exchanger 13b.
  • the auxiliary heat exchanger 13a and the main heat exchanger 13b are connected via the reheat dehumidifying valve 110.
  • FIG. 10 shows a block diagram showing a schematic configuration of the control unit 50 according to the present embodiment.
  • the control unit 50 controls the cooling operation control unit 42, the heating operation control unit 43, the dehumidification operation control unit 44, and the cleaning operation control unit 450.
  • the washing operation control unit 450 of the control unit 50 has the heating cycle reheat dehumidification operation control unit 48, which is different from the control unit 40 according to the first embodiment shown in FIG. Further, the control unit 50 according to the present embodiment controls the reheat dehumidifying valve 110.
  • control unit 50 receives each detected temperature from the evaporation temperature sensor 105, the temperature sensor 116, the indoor temperature sensor 107, the humidity sensor 108, the temperature thermistor 109, and the heat exchange intermediate thermistor 160.
  • the evaporation temperature sensor 105 is attached to the upstream pipe of the expansion valve 104 when viewed from the outdoor heat exchanger 103 side.
  • the evaporation temperature sensor 105 is the refrigerant decompressed by the reheat dehumidifying valve 110, and determines the evaporation temperature of the refrigerant flowing out from the auxiliary heat exchanger 13a. Detect.
  • the air conditioner 1 includes a temperature thermistor 109 that detects the refrigerant state of the refrigerant flowing through the first part (here, the auxiliary heat exchanger 13a).
  • the temperature thermistor 109 is, for example, a pipe between the auxiliary heat exchanger 13a and the main heat exchanger 13b, and is arranged in the downstream pipe of the reheat dehumidifying valve 110 (FIG. 11). reference). As shown in FIG. 11, in the pipe between the auxiliary heat exchanger 13a and the main heat exchanger 13b, the temperature thermistor 109 is arranged in the downstream pipe of the reheat dehumidifying valve 110 to be upstream of the expansion valve 104.
  • the control unit 50 can confirm the refrigerant state at the gas side end portion and the liquid side end portion of the auxiliary heat exchanger 13a. Thereby, the control unit 50 can confirm whether or not the entire area of the auxiliary heat exchanger 13a in which the first unit is arranged functions as an evaporation region.
  • the arrangement position and quantity of the temperature thermistor 109 are not limited to the embodiment of the present embodiment, and can be appropriately changed.
  • the temperature thermistor 109 may be realized by a plurality of sensors.
  • the heat exchange intermediate thermistor 160 is arranged in the main heat exchanger 13b, and detects the temperature of the refrigerant flowing through the main heat exchanger 13b (see FIG. 11).
  • the heat exchange intermediate thermistor 160 detects the evaporation temperature of the indoor heat exchanger 13 when the air conditioner 1 performs the cooling operation.
  • the heat exchange intermediate thermistor 160 detects the condensation temperature of the indoor heat exchanger 13 when the air conditioner 1 performs the heating operation.
  • the heat exchange intermediate thermistor 160 according to the present embodiment detects, for example, the refrigerant temperature in the condensed region of the main heat exchanger 13b.
  • a temperature sensor 116 which is a sensor for detecting the temperature of the refrigerant flowing in the second part, is arranged in the main heat exchanger 13b. More specifically, the temperature sensor 116 is located in the front main heat exchanger 13ba (see FIG. 11). The temperature sensor 116 is arranged in the front main heat exchanger 13ba to detect the temperature of the refrigerant flowing through the front main heat exchanger 13ba. Therefore, the temperature detected by the temperature sensor 116 is higher than the temperature detected by, for example, the heat exchange intermediate thermistor 160 provided in the main heat exchanger 13b, so that the control unit 50 is in the downstream region of the temperature sensor 116. Can be confirmed to be in the overcooled area.
  • the arrangement position and quantity of the temperature sensor 116 are not limited to the embodiment of the present embodiment, and can be appropriately changed. For example, the temperature sensor 116 may be realized by a plurality of sensors.
  • an indoor temperature sensor 107 is arranged behind the slit 11e (see FIG. 2) on the side surface of the main body casing 11.
  • the indoor temperature sensor 107 detects the indoor temperature.
  • a humidity sensor 108 as a humidity detecting means is arranged in the vicinity of the indoor temperature sensor 107.
  • the air conditioner 300 can execute the heating cycle reheat dehumidification operation.
  • the operation of the air conditioner 300 during the heating cycle reheat dehumidification operation is controlled by the heating cycle reheat dehumidification operation control unit 48 (hereinafter, may be referred to as a control unit 50).
  • the flow of the refrigerant during the heating cycle reheat dehumidification operation is the second cycle, similar to the flow of the refrigerant during the heating operation.
  • the heating cycle reheat dehumidification operation passes through the auxiliary heat exchanger 13a by closing the reheat dehumidification valve 110 after completing the condensation of the refrigerant discharged from the compressor 101 in the middle of the main heat exchanger 13b. It is an operation to dehumidify the indoor space by lowering the temperature of the refrigerant.
  • the flow of the refrigerant during the operation of the heating cycle reheat dehumidification operation will be described with reference to FIG. 11.
  • a high-temperature and high-pressure gas refrigerant is supplied from the discharge pipe of the compressor 101 to the branch portion 150 of the indoor heat exchanger 13.
  • the refrigerant branched at the branch portion 150 is supplied from the 7th inlet 132 and the 8th inlet 133 of the main heat exchanger 13b to the lower and upper portions of the front main heat exchanger 13ba and the rear main heat exchanger 13bb. Will be done.
  • the refrigerant supplied from the 7th inlet 132 and the 8th inlet 133 is the upper end of the lower portion of the front main heat exchanger 13ba, the lower end of the upper portion of the front main heat exchanger 13ba, and the rear main heat exchanger 13bb. It flows closer to the upper end.
  • the refrigerant is provided at the seventh outlet 152 provided near the upper end of the lower portion of the front main heat exchanger 13ba and near the lower end of the upper portion of the front main heat exchanger 13ba, and the rear main heat exchanger 13bb. It flows out from the eighth exit 153 provided near the upper end of the.
  • the refrigerant flowing out from the 7th outlet 152 and the 8th outlet 153 merges at the merging portion 140.
  • the refrigerant merged at the merging portion 140 is depressurized by the reheat dehumidifying valve 110.
  • the refrigerant decompressed by the reheat dehumidifying valve 110 to a low pressure enters from the ninth inlet 181 arranged near the upper end of the auxiliary heat exchanger 13a and flows toward the lower end of the auxiliary heat exchanger 13a. .. Then, the low-pressure refrigerant flows out from the ninth outlet 182 arranged near the lower end of the auxiliary heat exchanger 13a.
  • the air conditioning device 1 is an operation for cleaning the indoor heat exchanger 13 by setting the first part as an evaporation region after the heating operation. Drive.
  • the cleaning operation control unit 450 controls the operation of the air conditioner 300 during the cleaning operation.
  • the heating cycle reheat dehumidification operation is performed.
  • the flow of the refrigerant during the post-heating cleaning operation according to the present embodiment is the second cycle as in the heating operation.
  • the processing flow shown in FIG. 12 is merely an example, and may be appropriately changed as long as there is no contradiction.
  • other steps may be included before and after each step, and the order of each step may be appropriately changed within a range that does not contradict each other.
  • step S31 of FIG. 12 the control unit 50 determines whether or not there is a cleaning operation command from the remote controller or the like, proceeds to step S32 if there is a cleaning operation command, and waits for cleaning if there is no cleaning operation command. Continue to determine if there is an operation command.
  • the control unit 50 executes a cleaning operation after heating in step S32.
  • dirt tends to concentrate in the windward area, and as described above, in the present embodiment, the suction port 12 is provided in the front portion of the top surface portion 11a, so that the indoor heat exchange tends to occur. Dirt may be concentrated on the auxiliary heat exchanger 13a located on the windward side of the vessel 13. Therefore, in the present embodiment, the control unit 50 arranges the first part in the auxiliary heat exchanger 13a and the second part in the front main heat exchanger 13ba and the rear main heat exchanger 13bb.
  • control unit 50 fully opens the opening degree of the expansion valve 104 and throttles the reheat dehumidifying valve 110. Further, the control unit 50 adjusts the frequency of the compressor 101 to be low so that the refrigerant discharged from the compressor 101 completes the condensation in the middle of the main heat exchanger 13b, and the main heat exchanger 13b. A part of is used as a condensed area.
  • control unit 50 lowers the frequency of the compressor 101 and controls the rotation speed of the indoor fan 14 and the rotation speed of the outdoor fan as necessary to control the front main heat exchanger 13ba and the rear surface.
  • the rotation speeds of the compressor 101, the indoor fan 14, and the outdoor fan are controlled so that the gas side of the side main heat exchanger 13bb becomes the condensation region and the liquid side becomes the overcooling region.
  • the control unit 50 controls the reheat dehumidifying valve 110 so that the auxiliary heat exchanger 13a is in the evaporation region.
  • the supercooled region refers to a region in the indoor heat exchanger 13 in which the refrigerant in the supercooled state after condensation flows.
  • the condensed region refers to a region in the indoor heat exchanger 13 in which the refrigerant flows while condensing.
  • the control unit 50 sets the first part of the indoor heat exchanger 13 as the evaporation area and the second part as the supercooling area or the condensation area. While suppressing the formation of dew condensation in the second part, it is possible to cause the dew condensation mainly in the first part. As a result, the indoor heat exchanger 13 can be suitably cleaned with a small amount of dehumidification.
  • the first part is the evaporation area
  • the second part is the supercooling area and the condensation area. Therefore, the air sucked from the suction port 12 and cooled when passing through the auxiliary heat exchanger 13a which is the evaporation region is the air which is cooled when passing through the front main heat exchanger 13ba which is the condensation region. At the same time as being heated, it is mixed with the air that has passed through the back side main heat exchanger 13bb which is the condensation region, and is blown out from the outlet 15.
  • the same operation as the heating operation is performed while performing the cleaning of the first part. Therefore, the decrease in room temperature can be reliably suppressed.
  • the refrigerant supplied from the compressor 101 and the gas refrigerant supplied from the seventh inlet 132 (see FIG. 11) of the front main heat exchanger 13ba completes condensation in the middle of the front main heat exchanger 13ba. do.
  • the range between the seventh inlet 132 and the position 134 of the front main heat exchanger 13ba is the condensation region.
  • the range between the position 136 and the position 152, which is the range on the downstream side of the condensed area of the front main heat exchanger 13ba, is the supercooling area.
  • the gas refrigerant supplied from the eighth inlet 133 (see FIG.
  • the range between the eighth inlet 133 of the refrigerant of the rear main heat exchanger 13bb and the position 135 is the condensation region.
  • the range between the position 138 and the eighth outlet 153, which is the range on the downstream side of the condensed area of the rear main heat exchanger 13bb, is the supercooling area.
  • the refrigerant flowing through the above joins at the confluence portion 140.
  • the refrigerant merged at the merging portion 140 is depressurized (expanded) by the reheat dehumidifying valve 110.
  • the refrigerant decompressed by the reheat dehumidifying valve 110 flows through the auxiliary heat exchanger 13a arranged on the windward side of the front main heat exchanger 13ba.
  • the control unit 50 has the compressor 101, the expansion valve 104, and the reheat so that the indoor heat exchanger 13 has an evaporation region, a supercooling region, and a condensation region.
  • the dehumidifying valve 110 is controlled. As a result, dew condensation can be concentrated on the first part to be cleaned in the indoor heat exchanger 13. Therefore, the indoor heat exchanger 13 can be suitably cleaned with a small amount of dehumidification.
  • the air sucked from the suction port 12 and cooled when passing through the auxiliary heat exchanger 13a which is the evaporation region is heated when passing through the front main heat exchanger 13ba which is the condensing region. After that, it is mixed with the air that has passed through the rear main heat exchanger 13bb and is blown out from the outlet 15. Therefore, the decrease in room temperature is suppressed during the post-heating washing operation according to the present embodiment.
  • control unit 50 determines in step S33 whether or not there is a cleaning operation stop command, proceeds to step S34 if there is a cleaning operation command, and returns to step S32 if there is no cleaning operation stop command.
  • the control unit 50 stops the cleaning operation in step S34.
  • the first part is arranged in the auxiliary heat exchanger 13a.
  • the second part is arranged in the main heat exchanger 13b (front side main heat exchanger 13ba and rear side main heat exchanger 13bb).
  • the front side main heat exchanger 13ba and the rear side main heat exchanger 13bb become a condensation region or an overcooling region, and the auxiliary heat exchanger 13a
  • the compressor 101, the expansion valve 104, and the reheat dehumidifying valve 110 are controlled so that
  • the air conditioner 300 As a result, in the air conditioner 300 according to the present embodiment, it is possible to suppress a decrease in room temperature.
  • the air conditioner 300 it is possible to more reliably suppress the formation of dew condensation in the second part and more reliably cause the dew condensation in the first part. Therefore, it is possible to suitably clean the area where dirt may be concentrated in the indoor heat exchanger 13 with a small amount of dehumidification. Therefore, the indoor heat exchanger 13 can be suitably cleaned even during the heating period when it is difficult to obtain a large amount of dehumidification.
  • the air conditioner 300 includes a reheat dehumidifying valve 110.
  • the reheat dehumidifying valve 110 is provided between the first part and the second part in the refrigerant flow path of the indoor heat exchanger 13.
  • the air conditioner 300 throttles the reheat dehumidifying valve 110 and performs a cleaning operation after heating.
  • an evaporation region and a condensation region can be formed by an expansion mechanism.
  • the air sucked from the suction port 12 is cooled when passing through the auxiliary heat exchanger 13a which is the evaporation region, but the front main heat exchange which is the condensation region. It is heated as it passes through the vessel 13ba. Further, the air sucked from the suction port 12 is mixed with the air that has passed through the back side main heat exchanger 13bb which is a condensation region or a supercooling region, and is blown out from the outlet 15.
  • the air conditioner 300 according to the present embodiment can suppress the decrease in room temperature while causing dew condensation in the first part. Therefore, the indoor heat exchanger 13 can be suitably cleaned.
  • the second part has a supercooling region.
  • the air conditioner 300 it is possible to prevent the two-phase refrigerant from flowing into the reheat dehumidifying valve 110. More specifically, the liquid-state refrigerant can flow into the reheat dehumidifying valve 110.
  • the main heat exchanger 13b which is an overcooling region, is located between the auxiliary heat exchanger 13a, which is an evaporation region, and the main heat exchanger 13b, which is a condensation region.
  • the control unit 50 controls the frequency of the compressor 101, the rotation speed of the indoor fan 14, and the rotation speed of the outdoor fan so that the region is provided.
  • the control unit 50 can suppress heat transfer between the auxiliary heat exchanger 13a and the main heat exchanger 13b. Therefore, it is possible to suitably clean the area where dirt may be concentrated in the indoor heat exchanger 13 with a small amount of dehumidification. Therefore, the indoor heat exchanger 13 can be suitably cleaned even during the heating period when it is difficult to obtain a large amount of dehumidification.
  • the air conditioner 300 further includes a temperature sensor 116 for detecting the temperature of the refrigerant flowing through the second part.
  • the temperature sensor 116 is arranged in the main heat exchanger 13b, and detects the temperature of the refrigerant flowing through the main heat exchanger 13b.
  • the temperature detected by the temperature sensor 116 is higher than the temperature detected by the sensor of the heat exchange intermediate thermistor provided in the main heat exchanger 13b, for example, so that the control unit 50 has an excessive downstream region of the temperature sensor 116. It can be confirmed that it is in the cooling area.
  • the supercooled region can be confirmed. Therefore, it is possible to more reliably prevent the two-phase refrigerant from flowing into the expansion mechanism.
  • the auxiliary heat exchanger 13a has a front side auxiliary heat exchanger 13aa and a rear side auxiliary heat exchanger 13ab.
  • the front auxiliary heat exchanger 13aa is arranged in front (windward side) of the front main heat exchanger 13ba.
  • the rear side auxiliary heat exchanger 13ab is arranged behind (windward side) the rear side main heat exchanger 13bb.
  • the first part is arranged in the front side auxiliary heat exchanger 13aa and the rear side auxiliary heat exchanger 13ab.
  • the air conditioner according to the modified example 2A targets the front side auxiliary heat exchanger 13aa and the rear side auxiliary heat exchanger 13ab arranged on the wind side of the indoor heat exchanger 13 for cleaning.
  • FIG. 13 shows the refrigerant flow path of the indoor heat exchanger 13 in the modification 2A.
  • high-temperature and high-pressure gas refrigerant is supplied from the discharge pipe of the compressor 101 to the branch portion 150 of the indoor heat exchanger 13, and the low-pressure refrigerant is outdoor heat from the 10th outlet 144 of the indoor heat exchanger 13. It flows toward the exchanger 103.
  • the refrigerant branched at the branch portion 150 is from the 7th inlet 132 and the 8th inlet 133 of the main heat exchanger 13b to the lower and upper portions of the front main heat exchanger 13ba and the back side. It is supplied to the main heat exchanger 13bb.
  • the refrigerant supplied from the seventh inlet 132 flows toward the upper end of the lower portion of the front main heat exchanger 13ba and the lower end of the upper portion of the front main heat exchanger 13ba.
  • the refrigerant supplied from the eighth inlet 133 flows toward the upper end of the rear main heat exchanger 13bb.
  • the refrigerant is arranged near the upper end of the lower portion of the front main heat exchanger 13ba, near the lower end of the upper portion of the front main heat exchanger 13ba, and near the upper end of the rear main heat exchanger 13bb. It flows out from the exit 152 and the eighth exit 153. The refrigerant flowing out from the 7th outlet 152 and the 8th outlet 153 merges at the merging portion 140. The combined refrigerant is depressurized by the reheat dehumidifying valve 110.
  • the reduced pressure and low pressure refrigerant enters from the tenth inlet 143 arranged near the upper end of the back side auxiliary heat exchanger 13ab and flows out from the tenth outlet 144 near the lower end of the back side auxiliary heat exchanger 13ab.
  • the refrigerant flowing out of the 10th outlet 144 enters from the 9th inlet 181 arranged near the upper end of the front auxiliary heat exchanger 13aa and flows toward the lower end of the front auxiliary heat exchanger 13aa.
  • the low-pressure refrigerant flows out from the ninth outlet 182 arranged near the lower end of the front auxiliary heat exchanger 13aa.
  • the front side auxiliary heat exchanger 13aa and the rear side auxiliary heat exchanger 13ab are in the evaporation region.
  • the range between the 7th inlet 132 and the position 134 of the front main heat exchanger 13ba and the range between the 8th inlet 133 and the position 135 of the rear main heat exchanger 13bb are the condensation regions.
  • the range between the position 136 of the front main heat exchanger 13ba and the 7th outlet 152 and the range between the position 138 of the rear main heat exchanger 13bb and the 8th outlet 153 are supercooling regions.
  • the air conditioner according to the modified example 2A preferably cleans the indoor heat exchanger 13 even during the heating period when it is difficult to obtain a large amount of dehumidification. Can be done.
  • the second part by controlling the second part to be a supercooled area or a condensed area, the occurrence of dew condensation in the second part is suppressed, and the first part is focused on. Condensation can occur.
  • the room temperature decrease can be suppressed because the indoor heat exchanger 13 has a condensed region.
  • FIG. 14 shows the refrigerant flow path of the indoor heat exchanger 13 in the air conditioner according to the modification 2B.
  • the cooling cycle reheat dehumidifying operation the high-temperature and high-pressure gas refrigerant that has left the discharge pipe of the compressor 101 and passed through the outdoor heat exchanger 103 is supplied from the branch portion 150, and the low-pressure refrigerant is sucked into the compressor 101 from the ninth outlet 182.
  • the point of flow toward the pipe is different from the case where the refrigerant circuit 100 shown in FIG. 9 and the heating cycle reheat dehumidifying operation shown in FIG. 11 are performed.
  • the refrigerant branched at the branch portion 150 is from the 7th inlet 132 and the 8th inlet 133 of the main heat exchanger 13b to the lower and upper portions of the front main heat exchanger 13ba and the back side. It is supplied to the main heat exchanger 13bb.
  • the refrigerant supplied from the seventh inlet 132 flows toward the upper end of the lower portion of the front main heat exchanger 13ba and the lower end of the upper portion of the front main heat exchanger 13ba.
  • the refrigerant supplied from the eighth inlet 133 flows toward the upper end of the rear main heat exchanger 13bb.
  • the refrigerant is the seventh outlet 152 arranged near the upper end of the lower portion of the front main heat exchanger 13ba and near the lower end of the upper portion of the front main heat exchanger 13ba, and the rear main heat exchanger 13bb. It flows out from the eighth exit 153 located near the upper end. The refrigerant flowing out from the 7th outlet 152 and the 8th outlet 153 merges at the merging portion 140.
  • the combined refrigerant is depressurized by the reheat dehumidifying valve 110.
  • the reduced pressure and low pressure refrigerant enters from the ninth inlet 181 arranged near the upper end of the auxiliary heat exchanger 13a and flows toward the lower end of the auxiliary heat exchanger 13a. Then, the decompressed refrigerant flows out from the ninth outlet 182 arranged near the lower end of the auxiliary heat exchanger 13a.
  • the auxiliary heat exchanger 13a is in the evaporation region.
  • the range between the 7th inlet 132 and the position 134 of the front main heat exchanger 13ba and the range between the 8th inlet 133 and the position 135 of the rear main heat exchanger 13bb are the condensation regions.
  • the range between the position 136 of the front main heat exchanger 13ba and the 7th outlet 152 and the range between the position 138 of the rear main heat exchanger 13bb and the 8th outlet 153 are supercooling regions.
  • the first part is arranged in the front auxiliary heat exchanger 13aa.
  • the air conditioner according to the modified example 2B preferably cleans the indoor heat exchanger 13 even during the heating period when it is difficult to obtain a large amount of dehumidification. Can be done.
  • the second part by controlling the second part to be a supercooled area or a condensed area, the occurrence of dew condensation in the second part is suppressed, and the first part is focused on. Condensation can occur.
  • the room temperature decrease can be suppressed because the indoor heat exchanger 13 has a condensed region.
  • the indoor heat exchanger 13 of the air conditioner according to the present disclosure has fins 21, and the space between the fins 21a in the first part and the fins 21b in the second part is It is preferably configured to be separated.
  • the auxiliary heat exchanger 13a as the first part and the front main heat exchanger 13ba as the second part have fins 21a and 21b, respectively, and are auxiliary heat exchangers.
  • the fins 21a of the 13a and the fins 21b of the front main heat exchanger 13ba are configured to be separated from each other.
  • the air conditioner according to this modification can suppress the transfer of dew condensation water or heat between the first part and the second part, and can enhance the cleaning effect on the wind side of the indoor heat exchanger.
  • the air conditioner according to the modified example 2C can suitably clean the indoor heat exchanger 13 even during the heating period when it is difficult to obtain a large amount of dehumidification.
  • the fin 21 described in the above-described modification 2C preferably has a slit between the first portion and the second portion.
  • the air conditioner according to this modification is configured to have a slit between, for example, the auxiliary heat exchanger 13a as the first part and the front main heat exchanger 13ba as the second part.
  • the air conditioner according to this modification can suppress the transfer of dew condensation water or heat between the first part and the second part, and can enhance the cleaning effect on the wind side of the indoor heat exchanger.
  • the air conditioner according to the modified example 2D can suitably clean the indoor heat exchanger 13 even during the heating period when it is difficult to obtain a large amount of dehumidification.
  • the present disclosure is not limited to each of the above embodiments as it is.
  • the components can be modified and embodied within the range that does not deviate from the gist at the implementation stage.
  • dew condensation is performed on the surface of the evaporation area of the indoor heat exchanger 13, so-called dew condensation cleaning is performed.
  • the temperature of the evaporation area of the indoor heat exchanger 13 is set below the freezing point.
  • freeze-cleaning operation may be performed in which frost is formed on the surface of the heat exchanger.
  • the present disclosure can form various disclosures by appropriately combining the plurality of components disclosed in each of the above embodiments.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)

Abstract

L'invention concerne un dispositif de climatisation comprenant un circuit de fluide frigorigène et une unité de commande. Le circuit de fluide frigorigène comprend un échangeur de chaleur intérieur (13) ayant une première section sur le côté au vent et une seconde section sur le côté sous le vent de la première section. L'unité de commande amène l'échangeur de chaleur intérieur (13) à être nettoyé par le réglage de la première section pour servir de région d'évaporation après une opération de chauffage. L'unité de commande commande la température d'un fluide frigorigène s'écoulant à travers l'échangeur de chaleur intérieur (13) de telle sorte que la température du fluide frigorigène devienne égale ou inférieure à la température du point de rosée de l'air intérieur traversant l'échangeur de chaleur intérieur (13) dans la première section, et que la température du fluide frigorigène devienne plus élevée dans la seconde section que dans la première section.
PCT/JP2021/024152 2020-09-01 2021-06-25 Dispositif de climatisation WO2022049879A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6498374B1 (ja) * 2018-10-05 2019-04-10 日立ジョンソンコントロールズ空調株式会社 空気調和機、空気調和機の制御方法およびプログラム
JP6641066B1 (ja) * 2019-01-10 2020-02-05 日立ジョンソンコントロールズ空調株式会社 空気調和機

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JP3526367B2 (ja) * 1995-06-28 2004-05-10 東芝キヤリア株式会社 空気調和機
JPH10132360A (ja) * 1996-10-30 1998-05-22 Toshiba Corp 空気調和系の運転方法および空気調和装置
CN110749037B (zh) * 2018-07-23 2021-09-07 大金工业株式会社 空调器的蒸发器的自动清洗方法和装置
JP2020125855A (ja) * 2019-02-01 2020-08-20 ダイキン工業株式会社 空気調和機
JP7460899B2 (ja) * 2020-05-20 2024-04-03 ダイキン工業株式会社 空気調和装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6498374B1 (ja) * 2018-10-05 2019-04-10 日立ジョンソンコントロールズ空調株式会社 空気調和機、空気調和機の制御方法およびプログラム
JP6641066B1 (ja) * 2019-01-10 2020-02-05 日立ジョンソンコントロールズ空調株式会社 空気調和機

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