WO2020070892A1 - 空気調和機、空気調和機の制御方法およびプログラム - Google Patents

空気調和機、空気調和機の制御方法およびプログラム

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Publication number
WO2020070892A1
WO2020070892A1 PCT/JP2018/037444 JP2018037444W WO2020070892A1 WO 2020070892 A1 WO2020070892 A1 WO 2020070892A1 JP 2018037444 W JP2018037444 W JP 2018037444W WO 2020070892 A1 WO2020070892 A1 WO 2020070892A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchanger
indoor
indoor heat
air conditioner
control
Prior art date
Application number
PCT/JP2018/037444
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
烈将 毛塚
孝 田口
Original Assignee
日立ジョンソンコントロールズ空調株式会社
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 日立ジョンソンコントロールズ空調株式会社 filed Critical 日立ジョンソンコントロールズ空調株式会社
Priority to MYPI2019002200A priority Critical patent/MY195097A/en
Priority to JP2019502815A priority patent/JP6486586B1/ja
Priority to PCT/JP2018/037444 priority patent/WO2020070892A1/ja
Priority to ES201990035A priority patent/ES2752726R1/es
Priority to CN201880003390.4A priority patent/CN111356881B/zh
Priority to TW108113726A priority patent/TWI689688B/zh
Priority to FR1904811A priority patent/FR3086998B1/fr
Publication of WO2020070892A1 publication Critical patent/WO2020070892A1/ja

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G15/00—Details
    • F28G15/003—Control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
    • 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
    • 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
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/43—Defrosting; Preventing freezing of indoor units
    • 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
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • 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
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/22—Cleaning ducts or apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/20—Safety or protection arrangements; Arrangements for preventing malfunction for preventing development of microorganisms

Definitions

  • the present invention relates to an air conditioner, an air conditioner control method, and a program.
  • Patent Literature 1 states that “The air conditioner includes a refrigeration cycle having a heat exchanger that cools or heats surrounding air, and execution of a heating operation, a cooling operation, a dehumidification operation, and the like. And a controller 130 that controls the refrigeration cycle to perform a cleaning operation for cleaning the surface of the heat exchanger. "
  • Patent Document 1 does not specifically describe the details of driving of a fan such as an indoor unit in a cleaning operation. However, if the driving state of a fan such as an indoor unit is inappropriate, the heat exchanger may not be properly cleaned.
  • the present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an air conditioner, a method of controlling an air conditioner, and a program that can appropriately clean a heat exchanger in a cleaning operation.
  • an air conditioner of the present invention has a refrigeration cycle including a compressor that compresses a refrigerant, an indoor heat exchanger that cools or heats air in an air conditioning room, and a surface of the indoor heat exchanger.
  • a control device for controlling the refrigeration cycle so as to perform a cleaning operation for cleaning the indoor heat exchanger the control device, when the control device performs the cleaning operation
  • the heat exchanger can be appropriately cleaned in the cleaning operation.
  • FIG. 1 is a system diagram of an air conditioner 100 according to a first embodiment of the present invention. It is a sectional side view of the indoor unit in a 1st embodiment. 5 is a flowchart of a cleaning operation processing routine according to the first embodiment. It is a figure which shows an example of a moisture intake amount table. It is a figure showing an example of the relation between room temperature and relative humidity estimation value in a 2nd embodiment.
  • FIG. 1 is a system diagram of an air conditioner 100 according to a first embodiment of the present invention.
  • the air conditioner 100 includes an outdoor unit 30, an indoor unit 60, and a control device 20 that controls these.
  • the indoor unit 60 sets an operation mode (cooling, heating, dehumidification, ventilation, etc.), an indoor air volume (rapid wind, strong wind, weak wind, etc.), a target indoor temperature, and the like according to a signal input from the remote controller 90.
  • the control device 20 includes hardware as a general computer, such as a CPU (Central Processing Unit), a DSP (Digital Signal Processor), a RAM (Random Access Memory), and a ROM (Read Only Memory). , A control program executed by the CPU, various data, and the like.
  • the control device 20 controls each unit of the outdoor unit 30 and the indoor unit 60 based on the control program. The details will be described later.
  • the outdoor unit 30 includes a compressor 32, a four-way valve 34, and an outdoor heat exchanger 36.
  • the compressor 32 includes a motor 32a and has a function of compressing the refrigerant flowing through the four-way valve 34.
  • a suction side temperature sensor 41 for detecting the temperature of the refrigerant drawn into the compressor 32 and a suction side pressure sensor 45 for detecting the pressure of the refrigerant drawn into the compressor 32 are provided in the pipe a1.
  • a discharge-side temperature sensor 42 for detecting the temperature of the refrigerant discharged from the compressor 32 and a discharge-side pressure sensor 46 for detecting the pressure of the refrigerant discharged from the compressor 32 are provided in the pipe a2.
  • the compressor 32 is provided with a compressor temperature sensor 43 for detecting the temperature of the compressor 32.
  • the four-way valve 34 has a function of switching the direction of the refrigerant supplied to the indoor unit 60 depending on whether the indoor heat exchanger 64 functions as an evaporator or a condenser.
  • the indoor heat exchanger 64 functions as an evaporator, for example, during a cooling operation
  • the four-way valve 34 is switched to connect the pipes a2 and a3 and connect the pipes a1 and a6 along the path indicated by the solid line.
  • the high-temperature and high-pressure refrigerant discharged from the compressor 32 is cooled by the outdoor heat exchanger 36.
  • the cooled refrigerant is supplied to the indoor unit 60 via the pipe a5.
  • the four-way valve 34 connects the pipes a2 and a6 and connects the pipes a1 and a3 along the path indicated by the broken line. Can be switched.
  • the high-temperature and high-pressure refrigerant discharged from the compressor 32 is supplied to the indoor unit 60 via the pipes a2 and a6.
  • the outdoor fan 48 includes a motor 48 a and sends air to the outdoor heat exchanger 36.
  • the outdoor heat exchanger 36 is a heat exchanger that exchanges heat between the air sent from the outdoor fan 48 and the refrigerant, and is connected to the compressor 32 via the four-way valve 34.
  • the outdoor unit 30 has an outdoor heat exchanger inlet temperature sensor 51 (outside air temperature sensor) for detecting the temperature of the air flowing into the outdoor heat exchanger 36, and detects the temperature of the gas-side refrigerant of the outdoor heat exchanger 36.
  • An outdoor heat exchanger refrigerant gas temperature sensor 53 and an outdoor heat exchanger refrigerant liquid temperature sensor 55 that detects the temperature of the liquid-side refrigerant of the outdoor heat exchanger 36 are mounted.
  • the power supply unit 54 receives a three-phase AC voltage from the commercial power supply 22.
  • the power measurement unit 58 is connected to the power supply unit 54, and the power consumption of the air conditioner 100 is measured by this.
  • the DC voltage output from the power supply unit 54 is supplied to the motor control unit 56.
  • the motor control unit 56 includes an inverter (not shown), and supplies an AC voltage to the motor 32a of the compressor 32 and the motor 48a of the outdoor fan 48. Further, the motor control unit 56 controls the motors 32a and 48a without a sensor, and thereby detects the rotation speed of the motors 32a and 48a.
  • the indoor unit 60 includes a remote control communication unit 68 that performs bidirectional communication among the indoor expansion valve 62, the indoor heat exchanger 64, the indoor fan 66, the motor control unit 67, and the remote control 90 (operation unit).
  • the indoor fan 66 includes a motor 66a and sends air to the indoor heat exchanger 64.
  • the motor control section 67 includes an inverter (not shown) and supplies an AC voltage to the motor 66a. Further, the motor control section 67 controls the motor 66a without a sensor, and thereby detects the rotation speed of the motor 66a.
  • the indoor expansion valve 62 is inserted between the pipes a5 and a7, and has a function of adjusting the flow rate of the refrigerant flowing through the pipes a5 and a7 and depressurizing the refrigerant on the secondary side of the indoor expansion valve 62. doing.
  • the indoor heat exchanger 64 is a heat exchanger that exchanges heat between the indoor air sent from the indoor fan 66 and the refrigerant, and is connected to the indoor expansion valve 62 via a pipe a7.
  • the indoor unit 60 includes an indoor heat exchanger inlet air temperature sensor 70 (temperature sensor), an indoor heat exchanger exhaust air temperature sensor 72, an indoor heat exchanger inlet humidity sensor 74 (humidity sensor), and an indoor heat exchange.
  • a refrigerant gas temperature sensor 25 and an indoor heat exchanger refrigerant gas temperature sensor 26 are provided.
  • the indoor heat exchanger inlet air temperature sensor 70 detects the temperature of the air sucked by the indoor fan 66.
  • the indoor heat exchanger exhaust air temperature sensor 72 detects the temperature of the air exhausted from the indoor heat exchanger 64.
  • the indoor heat exchanger inlet humidity sensor 74 detects the humidity of the air sucked by the indoor fan 66. Further, the indoor heat exchanger refrigerant liquid temperature sensor 25 and the indoor heat exchanger refrigerant gas temperature sensor 26 are provided at a connection point between the indoor heat exchanger 64 and the pipe a6, and measure the temperature of the refrigerant flowing through the connection point. To detect.
  • the compressor 32, the four-way valve 34, the outdoor heat exchanger 36, the indoor expansion valve 62, the indoor heat exchanger 64, and the pipes a1 to a7 form a refrigeration cycle RC.
  • FIG. 2 is a side sectional view of the indoor unit 60.
  • the indoor unit 60 is a so-called “ceiling cassette type” that is buried in the ceiling 130 and exposes the lower surface to the air conditioning room.
  • the indoor heat exchanger 64 is formed in a plate shape bent in a substantially V-shape, and is installed at the center of the indoor unit 60.
  • the indoor fan 66 has fins arranged in a substantially cylindrical shape, and is disposed in front of the indoor heat exchanger 64. Below the indoor heat exchanger 64 and the indoor fan 66, a dew tray 140 for receiving condensed water is arranged below the indoor heat exchanger 64 and the indoor fan 66.
  • An inclined air filter 142 is provided behind the indoor heat exchanger 64.
  • the lower surface of the indoor unit 60 is covered with a decorative plate 143.
  • an air inlet 144 formed by cutting a slit in the decorative plate 143 is formed below the air filter 142.
  • the indoor heat exchanger inlet air temperature sensor 70 is provided between the indoor heat exchanger 64 and the air filter 142.
  • An air blowing passage 146 is formed in front of the indoor fan 66.
  • the left and right wind direction plates 148 are provided in the middle of the air blowing passage 146, and control the direction of the airflow in the left and right direction (perpendicular to the paper surface).
  • the vertical wind direction plate 150 is provided at the outlet of the air blowing passage 146, rotates around the fulcrum 150a, and controls the direction of the air flow in the vertical direction.
  • the left and right wind direction plates 148 and the upper and lower wind direction plates 150 are rotationally driven by the control device 20 (see FIG. 1).
  • the vertical wind direction plate 150 shown by a solid line in FIG. 2 indicates a position when the air conditioner is in a fully opened state.
  • the vertical wind direction plate 150 is rotated to the fully closed position 152 indicated by a dashed line. Further, when performing a cleaning operation described later, the vertical wind direction plate 150 is rotated to a position 156 indicated by a dashed line, and thereafter, is rotated to a cleaning operation position 154. And, as the opening degree of the vertical wind direction plate 150 increases, the pipe resistance of the air blowing passage 146 decreases. However, even when the vertical wind direction plate 150 is closed at the fully closed position 152, a gap FS is formed between the vertical wind direction plate 150 and the decorative plate 143, and there is a slight gap through the gap FS. The air flows.
  • the “cleaning operation” is executed automatically or according to a user's instruction.
  • the “cleaning operation” is an operation in which the surface of the indoor heat exchanger 64 is frosted or dewed and the surface of the indoor heat exchanger 64 is washed with the frosted or dewed water.
  • the case where the cleaning operation is automatically performed is, for example, a case where the cleaning operation is set to be periodically performed at predetermined time intervals.
  • the cleaning operation is classified into a “freezing cleaning operation” and a “condensation cleaning operation”.
  • the control device 20 switches the four-way valve 34 in the direction shown by the solid line so that the indoor heat exchanger 64 becomes an evaporator.
  • the control device 20 controls the air conditioner such as the rotation speed of the compressor 32, the opening degree of the indoor expansion valve 62, and the rotation speed of the indoor fan 66 so that the surface temperature of the indoor heat exchanger 64 is below freezing.
  • the state of each part of 100 is set. If this state is continued, frost will form on the surface of the indoor heat exchanger 64.
  • frost on the surface of the indoor heat exchanger 64 further grows.
  • the rotation speed of the indoor fan 66 in the freeze washing operation will be described.
  • the user of the air conditioner 100 can set the indoor air volume (rapid wind, strong wind, weak wind, etc.) by operating the remote controller 90.
  • the minimum air volume that can be set by the user operating the remote controller 90 is determined, and the user cannot set an air volume lower than this minimum air volume.
  • the rotation speed at the minimum air flow that can be specified by the user is called “user-specified minimum rotation speed”.
  • the control device 20 designates a predetermined “rotation speed during frost” as the rotation speed of the indoor fan 66.
  • the rotation speed during frost formation is a rotation speed lower than the minimum rotation speed specified by the user. The reason why such a low frosting rotation speed is applied is to suppress the cool air or the like leaking into the air-conditioned room when performing the cleaning operation, so that the user does not feel uncomfortable.
  • the controller 20 heats the indoor heat exchanger 64 by switching the four-way valve 34 (see FIG. 1) in the direction shown by the broken line so that the indoor heat exchanger 64 becomes a condenser. Then, the frost formed on the indoor heat exchanger 64 melts, and the surface of the indoor heat exchanger 64 is washed away. After that, the control device 20 stops the refrigeration cycle RC and continues to drive the indoor fan 66 for a predetermined time. Thereby, the surface of the indoor heat exchanger 64 dries. Through the above steps, the freeze washing operation is completed.
  • control device 20 switches the four-way valve 34 in the direction shown by the solid line so that the indoor heat exchanger 64 becomes an evaporator.
  • control device 20 sets the state of each part of air conditioner 100 such that the surface temperature of indoor heat exchanger 64 is lower than the dew point temperature and higher than zero degrees.
  • the control device 20 switches the four-way valve 34 in the direction shown by the broken line so that the indoor heat exchanger 64 becomes a condenser, heats the indoor heat exchanger 64, and continues to drive the indoor fan 66. Thereby, the surface of the indoor heat exchanger 64 dries.
  • FIG. 3 is a flowchart of a cleaning operation processing routine according to the present embodiment.
  • control device 20 performs various data collection. That is, while the refrigeration cycle RC is stopped, the indoor fan 66 is driven, air in the air conditioning room is taken into the indoor unit 60, and various data such as detection results of various sensors shown in FIG. 1 are collected.
  • the detection result of the indoor heat exchanger inlet air temperature sensor 70 is called room temperature T
  • the detection result of the indoor heat exchanger inlet humidity sensor 74 is called relative humidity H
  • the outdoor heat exchanger inlet The detection result of the temperature sensor 51 is called an outside air temperature TD.
  • the vertical wind direction plate 150 (see FIG. 2) is rotated to the position 156.
  • the control device 20 selects an operation type based on the collected data.
  • the selected operation type is “freeze washing operation”, “condensation washing operation”, or “operation stop”. If the freeze washing operation is possible, it is preferable to execute the freeze washing operation. However, if the relative humidity in the air conditioning room is too low, a sufficient amount of frost does not form on the indoor heat exchanger 64, and a sufficient cleaning effect cannot be obtained. Conversely, if the relative humidity H is too high, dew condensation may occur at locations other than the indoor heat exchanger 64 when performing the freeze washing operation.
  • a drain pipe, a drain pump, etc. (not shown) for discharging dew water are attached to the dew tray 140 (see FIG. 2) of the indoor unit 60. If there is a location where the temperature of the condensed water becomes 0 ° C. or lower, the drain pipe or the like may be clogged at that location. Therefore, when the room temperature T or the outside temperature TD is around 0 ° C., it is preferable to stop the cleaning operation. If the room temperature T or the outside temperature TD is high, there is a possibility that the cooling capacity cannot be secured to such an extent that the indoor heat exchanger 64 can be sufficiently frosted.
  • step S102 the control device 20 selects one of the "freezing washing operation", the "condensation washing operation” or the “operation stop” based on the room temperature T, the outside air temperature TD, and the relative humidity H. Select the operation type.
  • step S102 If “stop operation” is selected in step S102, the process proceeds to step S106, and an operation stop process is executed. Here, the indoor fan 66 is stopped, and the processing of this routine ends. If “condensation cleaning operation” is selected in step S102, the process proceeds to step S104, and the condensation cleaning operation is executed. Here, the above-described condensation cleaning operation is performed, and the processing of this routine ends.
  • step S102 If “freeze-washing operation” is selected in step S102, the process proceeds to step S110.
  • the process branches based on the range of the relative humidity H. More specifically, the process is branched based on a comparison result between the relative humidity H and the constants LH and HH.
  • the constant LH is, for example, about “40%”
  • the constant HH is, for example, about “60%”.
  • step S110 if the relative humidity H is in the range of “H ⁇ LH”, the process proceeds to step S130, and “freezing control F1” is executed. If the relative humidity H is in the range of “LH ⁇ H ⁇ HH”, the process proceeds to step S132, and “freezing control F2” is executed. If the relative humidity H is in the range of “HH ⁇ H”, the process proceeds to step S134, and “freezing control F3” is executed.
  • step S138 decompression control is executed. That is, the control device 20 heats the indoor heat exchanger 64 by switching the four-way valve 34 (see FIG. 1) in the direction shown by the broken line so that the indoor heat exchanger 64 becomes a condenser.
  • step S140 drying control is executed.
  • the control device 20 stops the refrigeration cycle RC and keeps driving the indoor fan 66 for a predetermined time. Thereby, the surface of the indoor heat exchanger 64 dries.
  • step S142 an operation stop process is executed. Here, the indoor fan 66 is stopped. Thus, the processing of this routine ends.
  • FIG. 4 is a diagram illustrating an example of the moisture intake amount table. As shown in the drawing, the humidity intake amount PH is uniquely determined with respect to the relative humidity H. It should be noted that the moisture intake table actually stores three points of moisture intake PH at the relative humidities LH, MH, and HH shown in the figure. Then, the control device 20 calculates the moisture intake amounts PH other than these three points by linear interpolation.
  • the moisture intake amount PH is a predetermined value PH1.
  • the moisture intake amount PH is a predetermined value PH3.
  • the moisture intake amount PH becomes a monotonically decreasing function that becomes smaller as the relative humidity H increases. Further, as described above, when the relative humidity constant LH is 40% and the constant HH is 60%, the predetermined value PH1 is 1.5 to 3 times the predetermined value PH3.
  • control device 20 determines the driving conditions of indoor fan 66 so as to realize the moisture intake amount PH obtained from the moisture intake amount table (FIG. 4). Then, the control device 20 drives the indoor fan 66 according to the determined driving conditions.
  • the saturated water vapor amount A is uniquely determined when the room temperature T is determined. Assuming that the fluctuation of the room temperature T can be ignored during the freezing control, the saturated steam amount A can be considered to be a constant.
  • the rotation speed of the indoor fan 66 in the freezing control that is, the above-described rotation speed at the time of frost formation is constant.
  • the position of the vertical wind direction plate 150 is the cleaning operation position 154 shown in FIG.
  • the air volume B can also be considered to be a constant.
  • determining the driving condition of the indoor fan 66 is equivalent to obtaining the air blowing time C proportional to the moisture intake amount PH. Therefore, if the predetermined value PH1 is 1.5 to 3 times the predetermined value PH3, the blowing time C in the freezing control F1 is 1.5 to 3 times the blowing time C in the freezing control F3.
  • the control device 20 switches the four-way valve 34 in the direction shown by the solid line so that the indoor heat exchanger 64 becomes an evaporator. Then, the control device 20 rotates the vertical wind direction plate 150 to the cleaning operation position 154 (see FIG. 2), and controls the rotation speed of the compressor 32 and the indoor temperature so that the surface temperature of the indoor heat exchanger 64 is below freezing. The degree of opening of the expansion valve 62 is set. Next, the control device 20 drives the indoor fan 66 at the frosting rotation speed for a time corresponding to the blowing time C previously obtained. Thereby, frost forms on the indoor heat exchanger 64. When the blowing time C has elapsed, the control device 20 stops the indoor fan 66.
  • the execution time from the start to the end of steps S130, S132, and S134 is the same, and the execution time is referred to as “freezing control time D”.
  • the freezing control time D is, for example, 20 minutes.
  • the blowing time C is, for example, about 7 minutes in the freezing control F1, and is, for example, about 3 minutes in the freezing control F3.
  • the time for stopping the indoor fan 66 and growing the frost is equal to “DC”, and is about 13 to 17 minutes in the example described above.
  • the blowing time C is equal to or less than half of the freezing control time D.
  • the frost formed on the indoor heat exchanger 64 due to the moisture inside the indoor unit 60 can be sufficiently grown in a non-blast state.
  • the period during which the indoor fan 66 is driven is concentrated in the first half of the freeze control time D. This allows operation in the first half with an emphasis on moisture uptake and in the second half with emphasis on frost growth. More specifically, control device 20 stops indoor fan 66 during the latter half of freeze control time D. Thereby, in the latter half period, the growth of frost can be further promoted.
  • the control device 20 stops the indoor fan 66, the frost formed on the indoor heat exchanger 64 cannot be sufficiently grown. Therefore, the rotation speed of the outdoor fan 48 when the indoor fan 66 is stopped may be higher than the rotation speed of the outdoor fan 48 when the indoor fan 66 is being driven. In particular, when the freezing and cleaning operation is performed when the outside air temperature TD is equal to or lower than the predetermined value, by controlling the outdoor fan 48 in this manner, the amount of frost formed on the indoor heat exchanger 64 can be increased.
  • the control device (20) when performing the cleaning operation, causes the indoor heat exchanger (64) to function as an evaporator and adjusts the surface temperature of the indoor heat exchanger (64).
  • a function of stopping the indoor fan (66) (S130, S132, S134). Further, the predetermined period is not more than half of the execution period of the freezing control.
  • the indoor fan (64) is attached to the indoor heat exchanger (64).
  • the frosted frost can be sufficiently grown, and the indoor heat exchanger (64) can be appropriately cleaned.
  • control device (20) is configured to control the driving time of the indoor fan (66) in the latter half of the execution period of the freezing control, as compared with the driving time of the indoor fan (66) in the first half of the execution period of the freezing control.
  • Has the function of shortening Thereby, in the first half, it is possible to operate with an emphasis on the intake of moisture and in the second half, with an emphasis on the growth of frost, so that the indoor heat exchanger (64) can be more appropriately cleaned.
  • the control device (20) stops the indoor fan (66) in the latter half of the execution period of the freezing control. Thereby, in the latter half period, the growth of frost can be further promoted, and the indoor heat exchanger (64) can be more appropriately cleaned.
  • the air conditioner (100) further includes an operation unit (90) for specifying an air volume by a user operation, and the rotation speed of the indoor fan (66) in the cleaning operation is specified by an operation on the operation unit (90). It is lower than the rotation speed at the lowest possible air flow.
  • the air conditioner (100) further includes a humidity sensor (74) for detecting the humidity (H) of the air flowing from the air conditioning room, and the control device (20) determines that the higher the detected humidity, the more the indoor fan ( 66) The drive time is shortened. As described above, as the humidity becomes higher, the driving time of the indoor fan (66) is reduced, so that dew condensation or the like on an undesired portion in the air conditioner (100) can be suppressed.
  • the air conditioner (100) further includes an outdoor fan (48), and the control device (20) increases the rotation speed of the outdoor fan during a period other than the predetermined period during the freezing control. Higher than the speed. Thereby, the amount of frost that forms frost on the indoor heat exchanger (64) can be increased.
  • the air conditioner (100) further includes an outdoor fan (48) and an outside air temperature sensor (51) for detecting an outside air temperature (TD).
  • TD outside air temperature
  • the rotation speed of the outdoor fan during a period other than the predetermined period is made higher than the rotation speed of the outdoor fan during the predetermined period.
  • the amount of frost which forms on the indoor heat exchanger (64) can be further increased.
  • step S100 the control device 20 obtains a value “estimated relative humidity Hest” based on the room temperature T in addition to the processing of the first embodiment. Then, in the processing after step S102, the relative humidity estimated value Hest is applied instead of the relative humidity H in the first embodiment.
  • FIG. 5 is a diagram illustrating an example of the relationship between the room temperature T and the estimated relative humidity Hest.
  • the relative humidity estimated value Hest is a function that monotonically increases as the room temperature T increases.
  • the reason that the estimated relative humidity value Hest can be used instead of the relative humidity H is based on the fact that the temperature and the relative humidity have a correlation corresponding to the area where the air conditioner 100 is installed. For example, assume that the air conditioner 100 is set to Japan. Considering Japan's climate, temperatures tend to be low in winter and high in summer.
  • the temperature sensor (70) that detects the temperature of the air flowing from the air-conditioning room is further provided, and the control device (20) increases the indoor temperature as the detected temperature increases.
  • the drive time of the fan (66) is shortened. Accordingly, the indoor heat exchanger inlet humidity sensor 74 shown in FIGS. 1 and 2 can be omitted, and the cost of the air conditioner can be reduced.
  • the present invention is not limited to the embodiments described above, and various modifications are possible.
  • the above-described embodiments are exemplarily illustrated for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described above.
  • a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of one embodiment can be added to the configuration of another embodiment.
  • a part of the configuration of each embodiment can be deleted, or another configuration can be added or replaced.
  • the control lines and information lines shown in the figure indicate those which are considered necessary for the description, and do not necessarily indicate all the control lines and information lines necessary for the product. In fact, it can be considered that almost all components are connected to each other. Possible modifications to the above embodiment are, for example, as follows.
  • processing illustrated in FIG. 3 has been described as software processing using a program in the above embodiment, part or all of the processing is performed by an ASIC (Application Specific Integrated Circuit) or an FPGA. (Field ⁇ Programmable ⁇ Gate ⁇ Array) may be replaced by hardware-based processing.
  • ASIC Application Specific Integrated Circuit
  • FPGA Field ⁇ Programmable ⁇ Gate ⁇ Array
  • the present invention is suitable for use in a ceiling cassette type indoor unit in which a difference between the environment of the air-conditioning room and the environment in the indoor unit is likely to occur, but is not limited by the type of the indoor unit.
  • the present invention may be applied to a wall-mounted indoor unit or a window-type air conditioner in which an indoor unit and an outdoor unit are integrated.
PCT/JP2018/037444 2018-10-05 2018-10-05 空気調和機、空気調和機の制御方法およびプログラム WO2020070892A1 (ja)

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MYPI2019002200A MY195097A (en) 2018-10-05 2018-10-05 Air Conditioner and Method and Program for Controlling Air Conditioner
JP2019502815A JP6486586B1 (ja) 2018-10-05 2018-10-05 空気調和機、空気調和機の制御方法およびプログラム
PCT/JP2018/037444 WO2020070892A1 (ja) 2018-10-05 2018-10-05 空気調和機、空気調和機の制御方法およびプログラム
ES201990035A ES2752726R1 (es) 2018-10-05 2018-10-05 Acondicionador de aire y metodo y programa para controlar el acondicionador de aire
CN201880003390.4A CN111356881B (zh) 2018-10-05 2018-10-05 空调机及空调机的控制方法
TW108113726A TWI689688B (zh) 2018-10-05 2019-04-19 空調機、空調機的控制方法以及程式
FR1904811A FR3086998B1 (fr) 2018-10-05 2019-05-09 Climatiseur et procédé et programme pour commander le climatiseur

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FR3086998B1 (fr) 2021-03-19
ES2752726A2 (es) 2020-04-06
ES2752726R1 (es) 2020-05-18
CN111356881A (zh) 2020-06-30
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