WO2021224962A1 - Dispositif de climatisation - Google Patents

Dispositif de climatisation Download PDF

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Publication number
WO2021224962A1
WO2021224962A1 PCT/JP2020/018529 JP2020018529W WO2021224962A1 WO 2021224962 A1 WO2021224962 A1 WO 2021224962A1 JP 2020018529 W JP2020018529 W JP 2020018529W WO 2021224962 A1 WO2021224962 A1 WO 2021224962A1
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Prior art keywords
compressor
low load
low
cooling
load
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PCT/JP2020/018529
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English (en)
Japanese (ja)
Inventor
慎一 伊藤
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2022519858A priority Critical patent/JP7438342B2/ja
Priority to PCT/JP2020/018529 priority patent/WO2021224962A1/fr
Publication of WO2021224962A1 publication Critical patent/WO2021224962A1/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
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits

Definitions

  • the present disclosure relates to an air conditioner equipped with a plurality of compressors.
  • the present disclosure has been made to solve the above problems, and an object of the present disclosure is to provide an air conditioner capable of averaging the life of a compressor.
  • the air conditioner according to the present disclosure includes a first compressor, a second compressor, a first heat exchanger, an expansion valve, and a refrigerant circuit in which a second heat exchanger is connected by a pipe to circulate the refrigerant.
  • a control device for controlling the first compressor and the second compressor is provided, and the control device is used during a cooling operation in which the first compressor and the second compressor are operated to perform cooling, or the control device. When the low load switching condition is satisfied during the heating operation in which the first compressor and the second compressor are operated to perform heating, one of the first compressor and the second compressor is operated from the cooling operation.
  • the low load cooling operation in which the compressor is operated to perform cooling, or the low load heating operation in which one of the first compressor and the second compressor is operated to perform heating is switched from the heating operation to the low load heating operation.
  • the load cooling operation or the low load heating operation after the preset continuous operation time elapses after starting one of the first compressor and the second compressor, the first compressor and the second compressor The operation target is changed to another one of the compressors.
  • the air conditioner according to the present disclosure includes a first compressor, a first heat exchanger, a first expansion valve, and a first refrigerant circuit in which a second heat exchanger is connected by a pipe and a refrigerant circulates.
  • the second compressor, the third heat exchanger, the second expansion valve, and the second compressor circuit in which the fourth heat exchanger is connected by a pipe and the refrigerant circulates, and the first compressor and the second A control device for controlling the compressor is provided, and the control device is used during a cooling operation in which the first compressor and the second compressor are operated to perform cooling, or the first compressor and the second compressor.
  • one of the first compressor and the second compressor When the low load switching condition is satisfied during the heating operation in which the compressor is operated to perform heating, one of the first compressor and the second compressor is operated from the cooling operation to perform cooling.
  • the load cooling operation or the low load heating operation in which one of the first compressor and the second compressor is operated to perform heating is switched from the heating operation to the low load cooling operation or the low load heating.
  • another one of the first compressor and the second compressor After starting one of the first compressor and the second compressor, and after a preset continuous operation time elapses, another one of the first compressor and the second compressor The operation target is changed to.
  • the cooling operation is switched to the low load cooling operation or the heating operation is switched to the low load heating operation. Then, in the low-load cooling operation or the low-load heating operation, after starting one compressor, the compressor to be operated is changed after a preset continuous operation time elapses. Therefore, the life of the compressor can be averaged.
  • FIG. 1 is a schematic configuration diagram of an air conditioner 100 according to an embodiment.
  • FIG. 2 is a refrigerant circuit diagram of the air conditioner 100 according to the embodiment.
  • the air conditioner 100 takes in outdoor air from the outdoor space and discharges the outdoor air to the outdoor space, two outdoor units 10a and 10b, and takes in the indoor air from the indoor space to control the humidity. It is provided with an indoor unit 20 that supplies the rear indoor air to the indoor space. Further, the air conditioner 100 includes a control device 40.
  • the number of outdoor units 10a and 10b is not limited to two, and may be one or three or more.
  • the outdoor unit 10a includes a compressor 11a, a flow path switching device 12a, an outdoor heat exchanger 13a, an expansion valve 14a, and an outdoor blower 15a.
  • the outdoor unit 10b includes a compressor 11b, a flow path switching device 12b, an outdoor heat exchanger 13b, an expansion valve 14b, and an outdoor blower 15b.
  • the outdoor heat exchangers 13a and 13a are also referred to as first heat exchangers.
  • the compressors 11a and 11b suck in the low-temperature low-pressure refrigerant, compress the sucked refrigerant, and discharge the high-temperature and high-pressure refrigerant.
  • the compressors 11a and 11b include, for example, an inverter compressor whose capacitance, which is the amount of transmission per unit time, is controlled by changing the operating frequency.
  • the operating frequencies of the compressors 11a and 11b (hereinafter referred to as compressor frequencies) are controlled by the control device 40.
  • the flow path switching devices 12a and 12b are, for example, four-way valves, and switch between cooling operation and heating operation by switching the flow direction of the refrigerant.
  • the flow path switching devices 12a and 12b are switched to the states shown by the solid lines in FIG. 2 during the cooling operation, and the discharge sides of the compressors 11a and 11b are connected to the outdoor heat exchangers 13a and 13b. Further, the flow path switching devices 12a and 12b are switched to the state shown by the broken line in FIG. 2 during the heating operation, and the discharge side of the compressors 11a and 11b is connected to the indoor heat exchangers 21a and 21b. Switching of the refrigerant flow path in the flow path switching devices 12a and 12b is controlled by the control device 40.
  • the outdoor heat exchangers 13a and 13b exchange heat between the outdoor air and the refrigerant.
  • the outdoor heat exchangers 13a and 13b function as condensers that dissipate the heat of the refrigerant to the outdoor air and condense the refrigerant during the cooling operation. Further, the outdoor heat exchangers 13a and 13b function as an evaporator that evaporates the refrigerant during the heating operation and cools the outdoor air by the heat of vaporization at that time.
  • a cross-fin type fin-and-tube heat exchanger composed of a heat transfer tube and a large number of fins is used.
  • the expansion valves 14a and 14b are, for example, electronic expansion valves capable of adjusting the opening degree of the throttle, and flow into the outdoor heat exchangers 13a and 13b or the indoor heat exchangers 21a and 21b by adjusting the opening degree. Control the pressure of the refrigerant.
  • the expansion valves 14a and 14b are provided in the outdoor units 10a and 10b, but they may be provided in the indoor unit 20 and the installation location is not limited.
  • the outdoor blowers 15a and 15b supply outdoor air to the outdoor heat exchangers 13a and 13b, and the amount of air blown to the outdoor heat exchangers 13a and 13b is adjusted by controlling the rotation speed.
  • a centrifugal fan or a multi-blade fan driven by a motor such as a DC (Direct Current) fan motor or an AC (Alternating Current) fan motor is used.
  • DC fan motor is used as a drive source for the outdoor blowers 15a and 15b
  • the amount of blown air is adjusted by changing the current value and controlling the rotation speed.
  • an AC fan motor is used as a drive source for the outdoor blowers 15a and 15b
  • the amount of blown air is adjusted by changing the power supply frequency and controlling the rotation speed by inverter control.
  • the indoor unit 20 includes indoor heat exchangers 21a and 21b, and an indoor blower 22. Further, the indoor unit 20 is formed with one suction port 23 for taking in the indoor air from the indoor space and a plurality of outlets 24 for supplying the indoor air after humidity control from the inside to the indoor space. A damper 25 is provided at each outlet 24. Further, in the indoor unit 20, an air passage 20a is formed in which the indoor air taken in from the indoor space by the indoor blower 22 passes through the indoor heat exchangers 21a and 21b and is blown into the indoor space after humidity control. ..
  • the number of indoor heat exchangers 21a and 21b is not limited to two, and the same number as the number of outdoor units 10a and 10b is provided. Further, the indoor heat exchangers 21a and 21b are also referred to as second heat exchangers.
  • the indoor heat exchangers 21a and 21b are arranged on the air passage 20a, and both exchange heat between the indoor air and the refrigerant.
  • the indoor heat exchangers 21a and 21b function as an evaporator that evaporates the refrigerant during the cooling operation and cools the outdoor air by the heat of vaporization at that time.
  • the indoor heat exchangers 21a and 21b function as condensers that dissipate the heat of the refrigerant to the outdoor air and condense the refrigerant during the heating operation.
  • a cross-fin type fin-and-tube heat exchanger composed of a heat transfer tube and a large number of fins is used.
  • the indoor blower 22 supplies indoor air to the indoor heat exchangers 21a and 21b, and the amount of air blown to the indoor heat exchangers 21a and 21b is adjusted by controlling the rotation speed.
  • a centrifugal fan or a multi-blade fan driven by a motor such as a DC fan motor or an AC fan motor is used.
  • a DC fan motor is used as the drive source of the indoor blower 22
  • the amount of blown air is adjusted by changing the current value and controlling the rotation speed.
  • an AC fan motor is used as the drive source of the indoor blower 22
  • the amount of blown air is adjusted by changing the power supply frequency by inverter control and controlling the rotation speed.
  • the damper 25 adjusts the amount of indoor air after humidity control supplied from the air outlet 24 to the indoor space, and the amount of indoor air after humidity control is adjusted by opening / closing control.
  • the outdoor unit 10a and the outdoor unit 10b are connected to the indoor unit 20 by piping, respectively.
  • the air conditioner 100 includes two refrigerant circuits 101a and 101b.
  • the compressor 11a, the flow path switching device 12a, the outdoor heat exchanger 13a, the expansion valve 14a, and the indoor heat exchanger 21a are sequentially connected by piping, and the refrigerant circulates.
  • the compressor 11b, the flow path switching device 12b, the outdoor heat exchanger 13b, the expansion valve 14b, and the indoor heat exchanger 21b are sequentially connected by piping, and the refrigerant circulates.
  • the refrigerant used in the refrigerant circuits 101a and 101b is not particularly limited.
  • natural refrigerants such as carbon dioxide, hydrocarbons or helium, chlorine-free refrigerants such as HFC-410A or HFC-407C, or chlorofluorocarbon refrigerants such as R22 or R134a used in existing products. Can be used.
  • the outdoor units 10a and 10b and the indoor unit 20 include a plurality of temperature sensors including, for example, a thermistor.
  • Discharge temperature sensors 31a and 31b for detecting the discharge temperature of the refrigerant are provided on the discharge side of the compressors 11a and 11b.
  • Outside air temperature sensors 34a and 34b for detecting the outside air temperature are provided near the suction ports (not shown) of the outdoor units 10a and 10b.
  • An indoor temperature sensor 35 for detecting the indoor temperature is provided near the suction port 23 of the indoor unit 20.
  • the outdoor units 10a and 10b are provided with a plurality of pressure sensors composed of, for example, a diaphragm gauge.
  • Discharge pressure sensors 32a and 32b for detecting the discharge pressure of the refrigerant are provided on the discharge side of the compressor 11a.
  • suction pressure sensors 33a and 33b for detecting the suction pressure of the refrigerant are provided on the suction side of the compressor 11a.
  • the condensation temperature can be obtained by converting the discharge pressure detected by the discharge pressure sensors 32a and 32b into the saturation temperature.
  • the evaporation temperature can be obtained by converting the suction pressure detected by the suction pressure sensors 33a and 33b into the saturation temperature.
  • temperature sensors are provided in the outdoor heat exchangers 13a and 13b and the indoor heat exchangers 21a and 21b, respectively, and the temperature sensors are used.
  • the condensation temperature and evaporation temperature may be determined.
  • Control device 40 The control device 40 transmits operation control signals to the outdoor units 10a and 10b and the indoor unit 20 based on the detection information of various temperature sensors and various pressure sensors, and controls them.
  • the control device 40 includes normal operation, low load operation, and low load start / stop operation as operation modes. Normal operation includes cooling operation and heating operation.
  • Low-load operation includes low-load cooling operation and low-load heating operation.
  • Low-load start / stop operation includes low-load cooling start / stop operation and low-load heating start / stop operation.
  • FIG. 3 is a block diagram showing an example of the control device 40 of the air conditioner 100 according to the embodiment. As shown in FIG. 3, on the input side of the control device 40, the discharge temperature sensors 31a and 31b, the outside air temperature sensors 34a and 34b, the room temperature sensor 35, the discharge pressure sensors 32a and 32b, and the suction pressure sensors 33a and 33b Is connected.
  • compressors 11a and 11b, flow path switching devices 12a and 12b, expansion valves 14a and 14b, outdoor blowers 15a and 15b, indoor blowers 22 and damper 25 are connected to the output side of the control device 40. ..
  • the control device 40 includes an information acquisition unit 41, an arithmetic processing unit 42, a device control unit 43, and a storage unit 44.
  • the control device 40 is composed of hardware such as a circuit device that realizes various functions by executing software on an arithmetic unit such as a microcomputer.
  • the information acquisition unit 41 obtains temperature information and pressure information detected by the discharge temperature sensors 31a and 31b, the outside air temperature sensors 34a and 34b, the room temperature sensor 35, the discharge pressure sensors 32a and 32b, and the suction pressure sensors 33a and 33b. get.
  • the arithmetic processing unit 42 performs various processes based on the temperature information and the pressure information acquired by the information acquisition unit 41.
  • the device control unit 43 generates an operation control signal for controlling each unit provided in the air conditioner 100 based on the processing result of the arithmetic processing unit 42.
  • the device control unit 43 transmits the generated operation control signal to the compressors 11a, 11b, the flow path switching devices 12a, 12b, the expansion valves 14a, 14b, the outdoor blowers 15a, 15b, the indoor blower 22, the damper 25, and the like. do.
  • the storage unit 44 stores various values used in each unit of the control device 40, and is, for example, a non-volatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, or EEPROM.
  • the storage unit 44 may be provided as a separate body from the control device 40.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 11a flows into the outdoor heat exchanger 13a via the flow path switching device 12a.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the outdoor heat exchanger 13a exchanges heat with the outdoor air taken in by the outdoor blower 15a, condenses while radiating heat, becomes a high-pressure liquid refrigerant, and flows out of the outdoor heat exchanger 13a. ..
  • the high-pressure liquid refrigerant flowing out of the outdoor heat exchanger 13a is depressurized by the expansion valve 14a to become a low-temperature low-pressure gas-liquid two-phase refrigerant, which flows into the indoor heat exchanger 21a.
  • the low-temperature low-pressure gas-liquid two-phase refrigerant that has flowed into the indoor heat exchanger 21a exchanges heat with the indoor air taken in by the indoor blower 22 and evaporates while absorbing heat, cooling the indoor air and forming a low-temperature low-pressure gas refrigerant. Then, it flows out from the indoor heat exchanger 21a.
  • the low-temperature and low-pressure gas refrigerant flowing out of the indoor heat exchanger 21a is sucked into the compressor 11a and becomes the high-temperature and high-pressure gas refrigerant again.
  • the high-pressure liquid refrigerant flowing out of the outdoor heat exchanger 13b is depressurized by the expansion valve 14b to become a low-temperature low-pressure gas-liquid two-phase refrigerant, which flows into the indoor heat exchanger 21b.
  • the low-temperature, low-pressure gas-liquid two-phase refrigerant that has flowed into the indoor heat exchanger 21b exchanges heat with the indoor air taken in by the indoor blower 22 and evaporates while absorbing heat, cooling the indoor air and forming a low-temperature, low-pressure gas refrigerant. Then, it flows out from the indoor heat exchanger 21b.
  • the low-temperature and low-pressure gas refrigerant flowing out of the indoor heat exchanger 21b is sucked into the compressor 11b and becomes the high-temperature and high-pressure gas refrigerant again.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 11a flows into the indoor heat exchanger 21a via the flow path switching device 12a.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the indoor heat exchanger 21a exchanges heat with the indoor air taken in by the indoor blower 22 and condenses while radiating heat. It flows out from the exchanger 21a.
  • the high-pressure liquid refrigerant flowing out of the indoor heat exchanger 21a is depressurized by the expansion valve 14a to become a low-temperature low-pressure gas-liquid two-phase refrigerant, which flows into the outdoor heat exchanger 13a.
  • the low-temperature low-pressure gas-liquid two-phase refrigerant that has flowed into the outdoor heat exchanger 13a exchanges heat with the outdoor air taken in by the outdoor blower 15a and evaporates while absorbing heat, becoming a low-temperature low-pressure gas refrigerant and becoming an outdoor heat exchanger. It flows out from 13a.
  • the low-temperature and low-pressure gas refrigerant flowing out of the outdoor heat exchanger 13a is sucked into the compressor 11a and becomes the high-temperature and high-pressure gas refrigerant again.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 11b flows into the indoor heat exchanger 21b via the flow path switching device 12b.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the indoor heat exchanger 21b exchanges heat with the indoor air taken in by the indoor blower 22 and condenses while radiating heat. It flows out from the exchanger 21b.
  • the high-pressure liquid refrigerant flowing out of the indoor heat exchanger 21b is depressurized by the expansion valve 14b to become a low-temperature low-pressure gas-liquid two-phase refrigerant, which flows into the outdoor heat exchanger 13b.
  • the low-temperature low-pressure gas-liquid two-phase refrigerant that has flowed into the outdoor heat exchanger 13b exchanges heat with the outdoor air taken in by the outdoor blower 15b and evaporates while absorbing heat, becoming a low-temperature low-pressure gas refrigerant and becoming an outdoor heat exchanger. It flows out from 13b.
  • the low-temperature and low-pressure gas refrigerant flowing out of the outdoor heat exchanger 13b is sucked into the compressor 11b and becomes the high-temperature and high-pressure gas refrigerant again.
  • FIG. 4 is a diagram showing a time-series change in the compressor frequency during low-load operation of a conventional air conditioner equipped with two compressors.
  • FIG. 5 is a diagram showing a time-series change in the compressor frequency during low-load operation of the air conditioner 100 according to the embodiment.
  • both of the two compressors 11a and 11b are started and stopped by repeating operation and stop.
  • the compressors 11a and 11b are stopped when the room temperature reaches the target temperature, and are started when the difference between the room temperature and the target temperature becomes equal to or more than a predetermined value. This is because if both of the two compressors 11a and 11b are continuously operated at a low load, the indoor space will be overcooled or overheated. Then, if the compressors 11a and 11b are repeatedly activated, the power consumption will increase.
  • the time zone in which the low-load cooling operation occurs (hereinafter referred to as the low-load cooling time zone) is a time zone in which the load due to solar radiation is small and the load generated in the indoor space is small, so that it is generally at midnight. be. Based on the general life pattern (see the life schedule specified by the Building Environment and Energy Conservation Organization (IBEC)), it is expected that low-load cooling operation will occur during the time period from 23:00 pm to 7:00 am.
  • IBEC Building Environment and Energy Conservation Organization
  • the time zone in which the low-load heating operation occurs (hereinafter referred to as the low-load heating time zone) is a time zone in which the load due to sunlight is large and the heat generation in the indoor space is large, so that it is generally in the daytime. Is. Under the general life pattern (see the life schedule specified by the Building Environment and Energy Conservation Organization (IBEC)), low-load heating operation is expected to occur during the time period from 8:00 am to 4:00 pm.
  • IBEC Building Environment and Energy Conservation Organization
  • the maximum value of the continuous operation time is set to 4 hours or less at most. Then, after the set continuous operation time has elapsed, the total operation time of the compressors 11a and 11b can be averaged by switching the compressors 11a and 11b to be operated.
  • the maximum value of the continuous operation time is set to be at most 8 hours divided by the number of compressors or less.
  • the storage unit 44 may store past operation data, and the low load cooling time zone and the low load heating time zone may be obtained based on the past operation data. Further, in the following, the low load cooling time zone and the low load heating time zone are collectively referred to as the low load time zone.
  • FIG. 6 is a diagram showing a time-series change in the compressor frequency during low-load start / stop operation of a conventional air conditioner equipped with two compressors.
  • FIG. 7 is a diagram showing a time-series change in the compressor frequency during low-load start / stop operation of the air conditioner 100 according to the embodiment.
  • the operation transitions from low load operation to low load start / stop operation.
  • the conventional low-load start / stop operation as shown in FIG. 6, one of the two compressors 11a and 11b stops, and the other repeats the start / stop operation.
  • the number of times the compressors 11a and 11b are started is biased to either side, and the life of the compressors varies. Therefore, in the low-load start / stop operation according to the embodiment, when the number of starts / stops of the compressors 11a and 11b is at least once, which is equal to or more than a preset threshold value, as shown in FIG.
  • the compressors 11a and 11b to be operated are changed. By doing so, the number of times the compressors 11a and 11b are started can be averaged, and the life of the compressors can be averaged.
  • the number of starts and stops may be the number of stops.
  • the compressors 11a and 11b are arranged in the outdoor space, the compressors 11a and 11b are cooled by the outdoor air when the compressors 11a and 11b are stopped during the low load heating start / stop operation.
  • energy for heating the compressors 11a and 11b is required, and the longer the stop time of the compressors 11a and 11b is, the larger the energy is required.
  • it is preferable that the interval from the stoppage of the same compressors 11a and 11b to the start-up time is short.
  • the threshold value of the number of starts and stops for switching the compressors 11a and 11b to be operated is set to be a larger value during the low load heating start and stop operation than during the low load cooling start and stop operation.
  • FIG. 8 is a diagram showing state transitions of the air conditioner 100 according to the embodiment: cooling operation, low load cooling operation, and low load cooling start / stop operation.
  • the cooling operation is performed as shown in FIG. 8A. Transition to low-load cooling operation.
  • the low-load cooling switching conditions are when the compressor frequency, power consumption, outside air humidity, or room temperature is below a preset threshold, when the compressor stop time is above a preset threshold, and , Either when the thermo-off control is turned from off to on, and so on.
  • thermo-off control is to stop all the compressors 11a and 11b and operate only the indoor blower 22 during the operation of the air conditioner 100. For example, when the room temperature falls within a predetermined range with respect to the set temperature, the thermo-off control is performed.
  • Cooling return conditions are when the compressor frequency, power consumption, outside air humidity, or room temperature becomes larger than the preset threshold value, when the compressor stop time becomes smaller than the preset threshold value, and when the thermostat is turned off. For example, when control is turned from on to off.
  • the low-load cooling start / stop switching condition is when the compressor frequencies of the compressors 11a and 11b during operation reach the lower limit value, or when the thermo-off control is turned from off to on.
  • the low-load cooling return condition is a case where a certain period of time has passed since the compressors 11a and 11b were started and the compressor frequency or power consumption becomes larger than a preset threshold value.
  • FIG. 9 is a diagram showing state transitions of the heating operation, the low load heating operation, and the low load heating start / stop operation of the air conditioner 100 according to the embodiment.
  • the low load heating switching condition is when the compressor frequency or power consumption is below the preset threshold, when the compressor stop time, outside air temperature, or room temperature is above the preset threshold. , When the thermo-off control is turned from off to on, or when the defrost control is turned from off to on.
  • the defrost control is an outdoor unit by controlling the flow path switching devices 12a, 12b, etc. so that one of the plurality of refrigerant circuits 101a, 101b has the same circuit configuration as that during the cooling operation during the heating operation. It is to melt the frost adhering to 10a and 10b. For example, the presence or absence of frost on the outdoor units 10a and 10b is determined based on the saturation temperature converted from the suction pressure detected by the suction pressure sensors 33a and 33b, and defrost control is performed when the presence or absence of frost is determined. It is said.
  • the air conditioning load during the low load heating operation becomes larger than the total of the minimum capacities of the compressors 11a and 11b, that is, when the heating recovery condition is satisfied during the low load heating operation, it is shown in B of FIG.
  • the heating return condition is that when the compressor frequency or power consumption becomes larger than the preset threshold value, the compressor stop time, the outside air temperature, or the room temperature becomes smaller than the preset threshold value, the thermo-off control is performed. Either from on to off, or from on to off defrost control.
  • the heating operation is performed by the two outdoor units 10a and 10b, that is, when the defrost control is turned on when the two compressors 11a and 11b are started, the defrost becomes the two outdoor units 10a and 10b. It is done against. Therefore, while the defrost control is on, the heating operation is interrupted and the heating capacity becomes zero. Therefore, it is assumed that the heating operation is performed by only one of the two outdoor units 10a and 10b, that is, only one of the two compressors 11a and 11b is operating. By doing so, even if the defrost control is turned on, the defrost is performed only on one of the two outdoor units 10a and 10b, and the heating operation can be continued by one of the outdoor units 10a and 10b. It is expected to improve comfort.
  • the range of the compressor frequency during the low-load heating operation is wider than that during the low-load cooling operation so that the load operation is as low as possible during heating and the number of compressors 11a and 11b in operation is only one. That is, when the compressor frequency is used for the low load heating switching condition and the low load cooling switching condition, the threshold value during the low load heating operation is made larger than that during the low load cooling operation. By doing so, it becomes easier to operate only one compressor 11a and 11b in the low-load heating operation than in the low-load cooling operation, and the comfort during the heating operation can be improved.
  • the low-load heating start / stop switching condition is when the compressor frequencies of the compressors 11a and 11b during operation reach the lower limit value, or when the thermo-off control is turned from off to on.
  • the low-load heating recovery condition is a case where a certain period of time has passed since the compressors 11a and 11b were started and the compressor frequency or power consumption becomes larger than a preset threshold value.
  • the transition is made in the order of cooling operation, low load cooling operation, and low load cooling start / stop operation. Further, as the load decreases, the transition is made in the order of heating operation, low load heating operation, and low load heating start / stop operation.
  • FIG. 10 is a diagram showing a time-series change in power consumption when none of the refrigerant circuits 101a and 101b satisfy the emergency control on condition during low-load operation of the air conditioner 100 according to the embodiment.
  • FIG. 11 is a diagram showing a time-series change in power consumption when any of the refrigerant circuits 101a and 101b satisfies the emergency control on condition during low-load operation of the air conditioner 100 according to the embodiment.
  • FIG. 12 is a diagram showing a time-series change in the compressor frequency during normal operation when the emergency control of the air conditioner 100 according to the embodiment is off.
  • FIG. 13 is a diagram showing a time-series change in the compressor frequency during normal operation with the emergency control of the air conditioner 100 according to the embodiment turned on.
  • emergency control is performed.
  • the necessity of emergency control is determined during the low load cooling operation or the low load heating operation.
  • the emergency control is turned on.
  • the emergency control on condition is when the compressor frequency, power consumption, discharge temperature, expansion valve opening degree, condensation temperature, or evaporation temperature becomes equal to or higher than a preset threshold value.
  • the operating time of the compressors 11a and 11b of the refrigerant circuits 101a and 101b satisfying the emergency control on condition is reduced by expanding the range of the compressor frequency. Then, the user is notified by the notification means that the emergency control is on and the compressors 11a and 11b, which are suspected of being out of order, are turned on.
  • the notification means is, for example, a remote controller (not shown) of the air conditioner 100, a communication terminal such as a mobile phone owned by the user, an information sharing terminal such as HEMS, or the like.
  • the threshold values in the low load cooling switching condition and the low load heating switching condition are changed so that the low load operation is promoted. For example, when the compressor frequency or power consumption is used for the low load cooling switching condition and the low load heating switching condition, the threshold value is made larger when the emergency control is on than when the emergency control is off.
  • the compressors 11a and 11b (hereinafter referred to as emergency control target compressors) of the refrigerant circuits 101a and 101b satisfying the emergency control on condition are stopped, and the other compressors 11a and 11b (hereinafter referred to as emergency control non-target) are stopped. Only operate the compressor). Then, when the air conditioning load becomes larger than the maximum capacity of one compressor 11a and 11b, the compressors 11a and 11b are operated when there are stopped compressors 11a and 11b except for the compressors subject to emergency control. Increase the number of units.
  • the first-aid control target compressor When the setting is changed by the user, the first-aid control target compressor is started and the operation is compared with the first-aid control non-target compressor which is a normal compressor. Then, the compressor frequencies or power consumption are compared, and if the difference is within a predetermined range, the emergency control is turned off, and if the difference is larger than the predetermined range, the emergency control is continued to be turned on. By doing so, even if the emergency control is turned on due to an erroneous determination of the emergency control on condition, the emergency control can be automatically turned off, and the influence on the user can be minimized.
  • the emergency control target compressor is activated and compared with the emergency control non-target compressor which is a normal compressor. Then, the compressor frequencies or power consumption are compared, and if the difference is within a predetermined range, the emergency control is turned off, and if the difference is larger than the predetermined range, the emergency control is continued to be turned on. By doing so, even if the emergency control is turned on due to an erroneous determination of the emergency control on condition, the emergency control can be automatically turned off, and the influence on the user can be minimized. Further, it is possible to determine the necessity of emergency control with a small amount of power consumption when the air conditioning load is small.
  • the maximum value of the continuous operation time during the low load cooling operation and the low load heating operation is specified, and the compressors 11a and 11b to be operated within the specified maximum value of the continuous operation time are switched. By doing so, the total operating time of the compressors 11a and 11b can be averaged, and the life of the compressor can be averaged.
  • the compressors 11a and 11b to be operated when the compressors 11a and 11b are stopped at least once are changed.
  • the number of times the compressors 11a and 11b are started can be averaged, and the life of the compressors can be averaged.
  • the emergency control is turned on. By doing so, even if an abnormality occurs in the specific compressors 11a and 11b, the low load operation can be continued, and the comfort of the user can be ensured.
  • the user is notified by the notification means that the emergency control is on and the maintenance work of the system is necessary, so that the maintenance time can be optimized and a serious failure can be prevented. Therefore, the life of the system can be extended.
  • the stopped compressors 11a and 11b are started, the operation is compared with the normal compressors 11a and 11b, and the emergency control is continued if the emergency control on condition is satisfied. However, if the emergency control on condition is not satisfied, the emergency control is turned off. By doing so, even if the emergency control is turned on due to an erroneous determination of the emergency control on condition, the emergency operation can be automatically turned off, and the influence on the user can be minimized.
  • the compressor targeted for emergency control should be started and compared with the compressor not targeted for emergency control, which is a normal compressor. Therefore, it is possible to determine the necessity of emergency control with a small amount of power consumption when the air conditioning load is small.
  • FIG. 14 is a refrigerant circuit diagram of a modified example of the air conditioner 100 according to the embodiment.
  • the air conditioner 100 according to the embodiment is configured to include two refrigerant circuits 101a and 101b, but is not limited thereto, and as shown in FIG. 14, the refrigerant circuit 101c having a plurality of compressors is provided. As for the configuration in which one is provided, the configuration may be used. Further, the air conditioner 100 according to the embodiment is configured to include a flow path switching device, but the configuration is not limited to this, and a configuration that does not include a flow path switching device is also applicable. good.
  • the first compressor, the second compressor, the first heat exchanger, the expansion valve, and the second heat exchanger are connected by a pipe to circulate the refrigerant. It includes a circuit and a control device 40 that controls the first compressor and the second compressor. Further, the control device 40 is used during a cooling operation in which the first compressor and the second compressor are operated to perform cooling, or in a heating operation in which the first compressor and the second compressor are operated to perform heating.
  • the low load cooling operation in which one of the first compressor and the second compressor is operated from the cooling operation to perform cooling, or the heating operation to the first compressor and the second compressor Switch to low-load heating operation in which one of the compressors is operated to heat, and in low-load cooling operation or low-load heating operation, one of the first compressor and the second compressor is started and then set in advance. After the specified continuous operation time has elapsed, the operation target is changed to another one of the first compressor and the second compressor.
  • the first compressor, the first heat exchanger, the first expansion valve, and the second heat exchanger are connected by a pipe to circulate the first refrigerant.
  • the circuit, the second compressor, the third heat exchanger, the second expansion valve, and the fourth heat exchanger are connected by a pipe to circulate the refrigerant, and the first compressor and the second It includes a control device 40 that controls the compressor. Further, the control device 40 is used during a cooling operation in which the first compressor and the second compressor are operated to perform cooling, or in a heating operation in which the first compressor and the second compressor are operated to perform heating.
  • the low load cooling operation in which one of the first compressor and the second compressor is operated from the cooling operation to perform cooling, or the heating operation to the first compressor and the second compressor Switch to low-load heating operation in which one of the compressors is operated to heat, and in low-load cooling operation or low-load heating operation, one of the first compressor and the second compressor is started and then set in advance. After the specified continuous operation time has elapsed, the operation target is changed to another one of the first compressor and the second compressor.
  • the cooling operation is switched to the low load cooling operation or the heating operation is switched to the low load heating operation.
  • the operation target is set to another one of the plurality of compressors. change. Therefore, the life of the compressor can be averaged.
  • the number of times the compressor is started and stopped is suppressed, and energy saving can be realized.
  • the number of compressors provided in the air conditioner 100 is two, the first compressor and the second compressor, but the number is not limited to two, and three or more may be used.
  • the air conditioner 100 includes a refrigerant circuit in which a compressor, a flow path switching device, a first heat exchanger, an expansion valve, and a second heat exchanger are connected by pipes to circulate refrigerant. It has more than one. Then, when the low load switching condition during the cooling operation is the compressor frequency equal to or lower than the first threshold value, and the low load switching condition during the heating operation is the case where the compressor frequency is equal to or lower than the second threshold value.
  • the second threshold is larger than the first threshold.
  • the air conditioner 100 it is possible to suppress defrosting from being performed on a plurality of outdoor units 10a and 10b, and the heating operation can be continued, so that the heating operation is comfortable.
  • the sex can be improved.
  • the air conditioner 100 includes a plurality of compressors including a first compressor and a second compressor, includes a storage unit 44 for storing past operation data, and the control device 40 includes a control device 40.
  • the low load time zone is calculated based on the past operation data, and the continuous operation time is set to be equal to or less than the value obtained by dividing the low load time zone by the number of a plurality of compressors.
  • the control device 40 has a plurality of compressors including the first compressor and the second compressor, and the control device 40 sets the continuous operation time to be equal to or less than the value obtained by dividing 8 hours by the number of the plurality of compressors.
  • the maximum value of the continuous operation time during the low load cooling operation and the low load heating operation is specified. Then, by switching the compressor to be operated within the specified maximum value of the continuous operation time, the total operation time of the compressor can be averaged, and the life of the compressor can be averaged.
  • the air conditioner 100 has a plurality of compressors including the first compressor and the second compressor, but the number of compressors may be any number as long as it is two or more.
  • the control device 40 when the low load start / stop switching condition is satisfied during the low load cooling operation or the low load heating operation, the control device 40 starts from the low load cooling operation to the first compression.
  • Low-load cooling start / stop operation that cools while starting / stopping operation with one of the machine and the second compressor, or starting / stopping operation with one of the first compressor and the second compressor from the low-load heating operation Switch to low-load heating start / stop operation that heats while operating, and in low-load cooling start / stop operation or low-load heating start / stop operation, after starting one of the first compressor and the second compressor, the number of starts and stops When is equal to or higher than the preset fourth threshold value, the operation target is changed to another one of the first compressor and the second compressor.
  • the number of starts and stops becomes equal to or higher than a preset fourth threshold value. Then, change the operation target to another one of the multiple compressors. By doing so, the number of times the compressor is started can be averaged, and the life of the compressor can be averaged.
  • the number of compressors provided in the air conditioner 100 is two, the first compressor and the second compressor, but the number is not limited to two, and three or more may be used.
  • the fourth threshold value is set to a larger value during the low load heating operation than during the low load cooling operation.
  • the number of times of switching the compressor to be operated during the low load heating start / stop operation can be reduced as compared with the low load cooling start / stop operation, and the energy for heating the compressor can be reduced. Can be suppressed. Therefore, energy saving can be realized in addition to averaging the compressor life.
  • the control device 40 is the first compressor and the second compressor that are in operation during the low load cooling operation or the low load heating operation.
  • the emergency control is turned on for the first compressor and the second compressor that satisfy the emergency control on condition, and the first compressor and the second compressor are used. If the emergency control is turned on, it will be stopped and not started.
  • the air conditioner 100 when the refrigerant circuit having the compressor during operation satisfies the emergency control on condition during the low load operation, the emergency control is turned on. By doing so, it becomes possible to continue low-load operation even if an abnormality occurs in a specific compressor, and it is possible to ensure the comfort of the user.
  • the number of compressors provided in the air conditioner 100 is two, the first compressor and the second compressor, but the number is not limited to two, and three or more may be used.
  • the air conditioner 100 is provided with a notification means for notifying the user that the emergency control is on when the emergency control is on.
  • the air conditioner 100 it is possible to optimize the maintenance time and prevent a serious failure by notifying the user by the notification means that the emergency control is on when the emergency control is turned on. Therefore, the life of the system can be extended.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

La présente invention concerne un dispositif de climatisation comprenant : un circuit de fluide frigorigène dans lequel un premier compresseur, un second compresseur, un premier échangeur de chaleur, une vanne de détente et un second échangeur de chaleur sont raccordés par une tuyauterie et un fluide frigorigène circule à l'intérieur de celui-ci ; et un dispositif de commande pour commander le premier compresseur et le second compresseur. Lorsqu'une condition de commutation à faible charge est satisfaite pendant l'opération de refroidissement dans laquelle le premier compresseur et le second compresseur sont amenés à fonctionner et le refroidissement est effectué ou pendant une opération de chauffage dans laquelle le premier compresseur et le second compresseur sont amenés à fonctionner et le chauffage est effectué, le dispositif de commande commute d'une opération de refroidissement à une opération de refroidissement à faible charge dans laquelle l'un du premier compresseur et du second compresseur est amené à fonctionner et le refroidissement est effectué ou passe d'une opération de chauffage à une opération de chauffage à faible charge dans laquelle l'un du premier compresseur et du second compresseur est amené à fonctionner et le chauffage est effectué, démarre l'un du premier compresseur et du second compresseur dans l'opération de refroidissement à faible charge ou l'opération de chauffage à faible charge, puis change le compresseur qui est actionné vers l'autre du premier compresseur et du second compresseur après qu'un temps de fonctionnement continu prédéfini s'est écoulé.
PCT/JP2020/018529 2020-05-07 2020-05-07 Dispositif de climatisation WO2021224962A1 (fr)

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JP2022519858A JP7438342B2 (ja) 2020-05-07 2020-05-07 空気調和装置
PCT/JP2020/018529 WO2021224962A1 (fr) 2020-05-07 2020-05-07 Dispositif de climatisation

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CN114151948A (zh) * 2021-11-15 2022-03-08 广东西屋康达空调有限公司 一种变频热泵空调机组的温度恒定控制方法、设备和***

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JP2000154950A (ja) * 1998-11-19 2000-06-06 Denso Corp エンジン駆動式ヒートポンプサイクル
JP2003166740A (ja) * 2001-11-30 2003-06-13 Sanyo Electric Co Ltd 空気調和装置
JP2013108681A (ja) * 2011-11-21 2013-06-06 Daikin Industries Ltd 空調システム
JP2018121445A (ja) * 2017-01-25 2018-08-02 日立ジョンソンコントロールズ空調株式会社 冷凍サイクル機器の遠隔制御システムおよび家電機器の遠隔制御システム
JP2018146171A (ja) * 2017-03-06 2018-09-20 ダイキン工業株式会社 空調システム

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Publication number Priority date Publication date Assignee Title
JP2000154950A (ja) * 1998-11-19 2000-06-06 Denso Corp エンジン駆動式ヒートポンプサイクル
JP2003166740A (ja) * 2001-11-30 2003-06-13 Sanyo Electric Co Ltd 空気調和装置
JP2013108681A (ja) * 2011-11-21 2013-06-06 Daikin Industries Ltd 空調システム
JP2018121445A (ja) * 2017-01-25 2018-08-02 日立ジョンソンコントロールズ空調株式会社 冷凍サイクル機器の遠隔制御システムおよび家電機器の遠隔制御システム
JP2018146171A (ja) * 2017-03-06 2018-09-20 ダイキン工業株式会社 空調システム

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114151948A (zh) * 2021-11-15 2022-03-08 广东西屋康达空调有限公司 一种变频热泵空调机组的温度恒定控制方法、设备和***

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