WO2018123361A1 - Dispositif de commande de climatiseur à blocs multiples, climatiseur à blocs multiples, procédé et programme de commande de climatiseur à blocs multiples - Google Patents

Dispositif de commande de climatiseur à blocs multiples, climatiseur à blocs multiples, procédé et programme de commande de climatiseur à blocs multiples Download PDF

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Publication number
WO2018123361A1
WO2018123361A1 PCT/JP2017/041936 JP2017041936W WO2018123361A1 WO 2018123361 A1 WO2018123361 A1 WO 2018123361A1 JP 2017041936 W JP2017041936 W JP 2017041936W WO 2018123361 A1 WO2018123361 A1 WO 2018123361A1
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WIPO (PCT)
Prior art keywords
heat exchanger
air conditioner
volume
defrosting
refrigerant
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PCT/JP2017/041936
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English (en)
Japanese (ja)
Inventor
正幸 瀧川
隆博 加藤
達弘 安田
知宏 阪口
Original Assignee
三菱重工サーマルシステムズ株式会社
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Application filed by 三菱重工サーマルシステムズ株式会社 filed Critical 三菱重工サーマルシステムズ株式会社
Priority to EP17885879.1A priority Critical patent/EP3473946A4/fr
Publication of WO2018123361A1 publication Critical patent/WO2018123361A1/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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • 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

  • the present invention relates to a control device for a multi-type air conditioner, a multi-type air conditioner, a control method for the multi-type air conditioner, and a control program for the multi-type air conditioner.
  • the defrosting operation is to remove (defrost) frost adhering to the heat exchanger by allowing a high-temperature and high-pressure refrigerant to flow into the heat exchanger.
  • the defrosting operation of a multi-type air conditioner constituted by a plurality of heat exchangers when the volume of each heat exchanger is different, the refrigerant flow rate required for defrosting is different for each heat exchanger.
  • Patent Document 1 discloses that the temperatures of the heat exchangers detected by the heat exchange temperature detecting means are compared and the refrigerant flow rate is controlled by the opening of the electric expansion valve.
  • Patent Document 2 discloses that the temperatures of the upper and lower paths of the heat exchanger are detected and the refrigerant flow rate is adjusted by the opening of the expansion valve in accordance with the temperature difference.
  • the present invention has been made in view of such circumstances, and is a multi-type air conditioner control device, a multi-type air conditioner, and a multi-type air capable of shortening the defrosting time in heat exchangers having different volumes. It is an object of the present invention to provide a control method for a conditioner and a control program for a multi-type air conditioner.
  • the control device for a multi-type air conditioner, the multi-type air conditioner, the control method for the multi-type air conditioner, and the control program for the multi-type air conditioner of the present invention employ the following means.
  • the control apparatus for a multi-type air conditioner according to the first aspect of the present invention includes: an outdoor unit including a plurality of heat exchangers, wherein the volume of at least one heat exchanger is different from the volume of other heat exchangers; A plurality of the heat exchangers, each of which includes a flow rate adjusting device for adjusting the flow rate of the refrigerant supplied to the heat exchanger. During the frost operation, the refrigerant flow rate supplied to each heat exchanger is adjusted by the control of the flow rate adjusting device according to the volumes of the plurality of heat exchangers.
  • the control device for the multi-type air conditioner including the outdoor unit including a plurality of heat exchangers having different volumes of at least one heat exchanger and the plurality of indoor units is used during the defrosting operation.
  • the refrigerant flow rate is controlled according to the volume of each heat exchanger.
  • the defrosting completion timing is different, a loss of refrigerant that is circulated to prevent re-frosting occurs. Therefore, by controlling the refrigerant flow rate according to the volume of each heat exchanger, the defrosting of each heat exchanger is completed substantially simultaneously. Thereby, it is not necessary to circulate a refrigerant
  • the defrosting of each heat exchanger is completed almost simultaneously, and the defrosting operation is completed early.
  • the volume of each heat exchanger is a numerical value that can be acquired in advance, can be controlled from the start of the defrosting operation, and the time required for defrosting can be shortened.
  • the flow rate adjusting device includes an electric expansion valve
  • the plurality of heat exchangers each include a temperature sensor that detects a heat exchanger temperature of the heat exchanger, and all the heat exchangers
  • the valve opening degree determination control for determining the opening degrees of the electric expansion valves of the plurality of heat exchangers so that the heat exchanger temperature reaches the defrosting completion temperature that is the reference value for completion of defrosting at substantially the same time. Good.
  • the defrosting is completed when the refrigerant flow rate required for defrosting varies depending on the volume, so that the same refrigerant flow rate is obtained.
  • the timing to do is different.
  • the refrigerant flow rate is controlled according to the volume of the heat exchanger because the opening of the electric expansion valve is adjusted and the refrigerant flow rate is controlled so that the heat exchanger temperature of each heat exchanger reaches the defrosting completion temperature at the same time. In doing so, the opening degree of the electric expansion valve is set for each heat exchanger based on the defrosting completion temperature.
  • the ratio of the refrigerant flow rate of each heat exchanger is determined in advance so that the heat exchangers reach the defrosting completion temperature substantially simultaneously, and the opening degree of each electric expansion valve is set based on the ratio. . Even in a multi-type air conditioner provided with a plurality of heat exchangers having different volumes, the defrosting of each heat exchanger is completed at the same time, so that the refrigerant flow rate required for the defrosting can be reduced.
  • the opening degree of the electric expansion valve of the heat exchanger may be a minimum opening degree.
  • the timing of defrosting completion may be different due to various factors.
  • the heat exchanger by which defrost was completed ie, the heat exchanger whose heat exchanger temperature became more than defrost completion temperature
  • the opening degree of the electric expansion valve is made into the minimum opening degree.
  • the minimum opening is an opening that allows a very small amount of refrigerant to flow in so that the outdoor heat exchanger that has completed defrosting does not refrost, and is, for example, about 60 pulses.
  • the said electric drive of this heat exchanger may be gradually increased.
  • the refrigerant flow rate is minimized, so that there is a possibility of refrosting.
  • the heat exchanger temperature of the corresponding heat exchanger becomes lower than the defrosting completion temperature, it is assumed that there is a possibility of refrosting, and the opening degree of the electric expansion valve is gradually increased. Thereby, frost formation of the heat exchanger can be prevented by increasing the refrigerant flow rate.
  • the opening degree of the electric expansion valve of the heat exchanger may be fully opened.
  • the timing of defrosting completion may be different due to various factors.
  • the electric expansion valves of the other heat exchangers have the minimum opening, and there is a margin in the refrigerant supply amount. There will be. However, if the opening degree of the electric expansion valve of the heat exchanger that has not been defrosted remains the same, the supply of the refrigerant flow rate does not increase and defrosting takes time.
  • the opening degree of the electric expansion valve of the heat exchanger is fully opened.
  • the maximum amount of surplus refrigerant can be supplied to the heat exchanger that has not been defrosted, and the time required for defrosting can be shortened.
  • the valve opening determination control may be performed at the time of shipment from a factory or during a trial operation, and the opening of the electric expansion valve may be stored in a storage unit.
  • the control for determining the opening degree of the electric expansion valve serving as a reference is performed at the time of shipment from the factory or at the time of trial operation, and the opening degree is stored in the storage means.
  • the refrigerant flow rate can be properly stored at the time of trial operation before starting normal air-conditioning operation or at the time of valve opening determination control performed at the time of shipment from the factory. Therefore, since the refrigerant flow rate is supplied based on the reference opening during normal air conditioning operation, defrosting can be completed simultaneously even in an air conditioner having a plurality of heat exchangers with different volumes.
  • the multi-type air conditioner according to the second aspect of the present invention includes an outdoor unit including a plurality of heat exchangers having a volume of at least one heat exchanger different from that of other heat exchangers, and a plurality of indoor units And a control device according to any of the above.
  • a control method for a multi-type air conditioner includes: an outdoor unit including a plurality of heat exchangers, wherein the volume of at least one heat exchanger is different from the volume of other heat exchangers; A plurality of heat exchangers, each of the plurality of heat exchangers including a flow rate adjusting device for adjusting a flow rate of refrigerant supplied to the heat exchanger. A step of adjusting the flow rate of the refrigerant supplied to each of the heat exchangers according to the volume of the plurality of heat exchangers during the frost operation is controlled by the flow rate adjusting device.
  • a control program for a multi-type air conditioner includes: an outdoor unit including a plurality of the heat exchangers, wherein the volume of at least one heat exchanger is different from the volume of other heat exchangers; A plurality of heat exchangers, each of which includes a flow rate adjusting device for adjusting a flow rate of refrigerant supplied to the heat exchanger. A step of adjusting the flow rate of the refrigerant supplied to each of the heat exchangers according to the volume of the plurality of heat exchangers during the frost operation by the control of the flow rate adjusting device;
  • the flow rate of each refrigerant is adjusted by controlling the flow rate adjusting device based on the volume of each heat exchanger having a different volume, so that the defrosting of each heat exchanger is completed almost simultaneously. By making it, defrosting time can be shortened.
  • Embodiments of a control device for a multi-type air conditioner, a multi-type air conditioner, a control method for a multi-type air conditioner, and a control program for a multi-type air conditioner according to the present invention will be described below with reference to the drawings. explain.
  • FIG. 1 shows a refrigerant circuit diagram during heating operation of the multi-type air conditioner according to the present embodiment.
  • a plurality of indoor units 3A and 3B are connected to a single outdoor unit 2 in parallel.
  • the plurality of indoor units 3 ⁇ / b> A and 3 ⁇ / b> B are connected in parallel to each other via a branching device 6 between a gas side pipe 4 and a liquid side pipe 5 connected to the outdoor unit 2.
  • the outdoor unit 2 includes an inverter-driven compressor 10 that compresses the refrigerant, a four-way switching valve 12 that switches the circulation direction of the refrigerant, and a plurality of outdoor heat exchangers (heat exchangers) 13A that exchange heat between the refrigerant and the outside air.
  • an inverter-driven compressor 10 that compresses the refrigerant
  • a four-way switching valve 12 that switches the circulation direction of the refrigerant
  • a plurality of outdoor heat exchangers (heat exchangers) 13A that exchange heat between the refrigerant and the outside air.
  • outdoor heat exchanger temperature sensors 14A, 14B and 14C for detecting the heat exchanger temperatures of the outdoor heat exchangers 13A, 13B and 13C, and the outdoor heat exchangers 13A, 13B and 13C
  • Outdoor expansion valves (electric expansion valves: EEVH) (flow rate adjusting devices) 15A, 15B and 15C for adjusting the flow rate of each refrigerant, a receiver 16 for storing liquid refrigerant, and a supercooling heat exchanger 17 for supercooling the liquid refrigerant.
  • EEVH electric expansion valves
  • a supercooling expansion valve (EEVSC) 18 that controls the amount of refrigerant diverted to the supercooling heat exchanger 17, and a liquid component separated from the refrigerant gas sucked into the compressor 10, and only the gas component is compressed.
  • accumulator 19 and to be taken to 10 side, a gas-side operation valve 20, and a liquid-side operation valve 21.
  • the volumes of the outdoor heat exchangers 13A, 13B, and 13C are different.
  • FIG. 1 and FIG. 2 illustrate the case where three outdoor heat exchangers 13A, 13B, and 13C are installed, the number of installed units can be arbitrarily determined.
  • each outdoor heat exchanger 13 either A, B or C is added at the end, and when not distinguishing each outdoor heat exchanger 13, A, B or C is omitted.
  • each outdoor heat exchanger temperature sensor 14 it attaches either A, B, or C to the end, and when not distinguishing each outdoor heat exchanger temperature sensor 14, A, B, or C is used. Omitted.
  • the above devices on the outdoor unit 2 side are sequentially connected via a refrigerant pipe 22 to constitute a known outdoor refrigerant circuit 23. Further, the outdoor unit 2 is provided with an outdoor fan (not shown) that blows outside air to each outdoor heat exchanger 13.
  • the gas side pipe 4 and the liquid side pipe 5 are refrigerant pipes connected to the gas side operation valve 20 and the liquid side operation valve 21 of the outdoor unit 2, and are connected to the outdoor unit 2 and to it during installation on site.
  • the pipe length is appropriately set according to the distance between the plurality of indoor units 3A and 3B.
  • a plurality of branching devices 6 are provided in the middle of the gas side piping 4 and the liquid side piping 5, and an appropriate number of indoor units 3 ⁇ / b> A and 3 ⁇ / b> B are connected via the branching devices 6. Thereby, one sealed refrigeration cycle (refrigerant circuit) 7 is configured.
  • the indoor units 3 ⁇ / b> A and 3 ⁇ / b> B exchange or heat indoor air with a refrigerant to cool or heat the indoor unit 3 ⁇ / b> A through an indoor heat exchanger 30, an indoor expansion valve (EEVC) 31, and an indoor heat exchanger 30.
  • An indoor fan 32 that circulates indoor air and an indoor controller 33 are provided, and are connected to the branching device 6 via branch gas side pipes 4A and 4B and branch liquid side pipes 5A and 5B on the indoor side.
  • the control device 50 acquires a set value, a refrigerant temperature, and the like by the indoor controller 33, and performs switching control of the four-way switching valve 12, opening / closing of each valve, opening degree control, and the like.
  • the control device 50 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and a computer-readable storage medium.
  • a series of processes for realizing various functions is stored in a storage medium or the like in the form of a program as an example, and the CPU reads the program into a RAM or the like to execute information processing / arithmetic processing. As a result, various functions are realized.
  • the program is preinstalled in a ROM or other storage medium, provided in a state stored in a computer-readable storage medium, or distributed via wired or wireless communication means. Etc. may be applied.
  • Examples of the computer-readable storage medium include a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, and a semiconductor memory.
  • the heating operation is performed as follows.
  • the high-temperature and high-pressure refrigerant gas compressed and discharged by the compressor 10 is circulated to the gas-side operation valve 20 side through the four-way switching valve 12.
  • the high-pressure gas refrigerant is led out from the outdoor unit 2 through the gas side operation valve 20 and the gas side pipe 4, and is supplied to the plurality of indoor units 3A and 3B through the branching unit 6, the indoor side branching gas side pipes 4A and 4B. be introduced.
  • the high-temperature and high-pressure refrigerant gas introduced into the indoor units 3A and 3B is heat-exchanged with the indoor air circulated through the indoor fan 32 in the indoor heat exchanger 30, and the heated indoor air is blown into the room. It is used for heating.
  • the refrigerant condensed and liquefied in the indoor heat exchanger 30 reaches the branching device 6 through the indoor expansion valve 31 and the branch liquid side pipes 5A and 5B, and is merged with the refrigerant from other indoor units. After that, it returns to the outdoor unit 2.
  • the opening degree of the indoor expansion valve 31 is set to the indoor controller so that the refrigerant outlet temperature or the refrigerant subcooling degree of the indoor heat exchanger 30 functioning as a condenser becomes the control target value. 33 is controlled.
  • the refrigerant that has returned to the outdoor unit 2 passes through the liquid side operation valve 21, reaches the supercooling heat exchanger 17, and flows through the liquid refrigerant pipe side in part. Heat exchange with the adiabatic expanded refrigerant provides a degree of supercooling. Thereafter, the amount of circulation is adjusted by flowing into the receiver 16 and once stored. This liquid refrigerant is supplied to each outdoor expansion valve 15 and adiabatically expanded, and then flows into each outdoor heat exchanger 13.
  • each outdoor heat exchanger 13 the outside air blown from the outdoor fan and the refrigerant are heat-exchanged, and the refrigerant absorbs heat from the outside air and is evaporated and gasified.
  • This refrigerant is introduced from each outdoor heat exchanger 13 through the four-way switching valve 12 and the refrigerant gas from the supercooling heat exchanger 17 and then introduced into the accumulator 19.
  • the liquid component contained in the refrigerant gas is separated, and only the gas component is sucked into the compressor 10 and compressed again in the compressor 10.
  • the heating operation is performed by repeating the above cycle.
  • each outdoor heat exchanger 13 may be frosted.
  • the heating capacity is reduced.
  • the defrosting operation is performed by switching the four-way switching valve 12.
  • the defrosting operation is generally activated when the temperature detected by the outdoor heat exchanger temperature sensor 14 of each outdoor heat exchanger 13 is equal to or lower than a certain temperature.
  • the temperature at which the defrosting operation is performed varies depending on each multi-type air conditioner 1, for example, a value around 0 ° C.
  • FIG. 2 shows a refrigerant circuit diagram during the defrosting operation of the multi-type air conditioner according to the present embodiment.
  • the defrosting operation is performed as follows.
  • the high-temperature and high-pressure refrigerant gas compressed and discharged by the compressor 10 is circulated to the outdoor heat exchanger 13 side by the four-way switching valve 12, and is heat-exchanged with the outdoor air blown by the outdoor fan in each outdoor heat exchanger 13. Is condensed and liquefied.
  • the liquid refrigerant passes through each outdoor expansion valve 15 and is temporarily stored in the receiver 16. In this way, defrosting is performed by the high-temperature and high-pressure refrigerant gas flowing into each outdoor heat exchanger 13.
  • the liquid refrigerant whose circulation amount is adjusted by the receiver 16 reaches the supercooling heat exchanger 17 and is supercooled in the same manner as in heating.
  • This liquid refrigerant is guided from the outdoor unit 2 to the liquid side pipe 5 through the liquid side operation valve 21, and is divided into the branch liquid side pipes 5A and 5B of the indoor units 3A and 3B via the branching unit 6. .
  • the liquid refrigerant divided into the branch liquid side pipes 5A and 5B flows into the indoor units 3A and 3B, is adiabatically expanded by the indoor expansion valve 31, and flows into the indoor heat exchanger 30 as a gas-liquid two-phase flow.
  • the refrigerant gas merged in the gas side pipe 4 returns to the outdoor unit 2 again, merges with the refrigerant gas from the supercooling heat exchanger 17 through the gas side operation valve 20 and the four-way switching valve 12, and then accumulator 19. To be introduced. In the accumulator 19, the liquid component contained in the refrigerant gas is separated, and only the gas component is sucked into the compressor 10. This refrigerant is compressed again in the compressor 10, and the defrosting operation is performed by repeating the above cycle.
  • the defrosting operation is generally completed when the temperature detected by the all-outdoor heat exchanger temperature sensor 14 of the all-outdoor heat exchanger 13 becomes equal to or higher than a certain temperature due to the defrosting operation.
  • the temperature used as the reference value for the completion of the defrosting operation that is, the defrosting completion temperature differs depending on each multi-type air conditioner 1, it is, for example, a value around 9 ° C.
  • FIG. 3 is a block diagram schematically illustrating the refrigerant flow rate during the defrosting operation of each heat exchanger of the multi-type air conditioner according to the first embodiment of the present invention.
  • FIG. 4 is a block diagram showing an outline of the refrigerant flow rate at the completion of defrosting of each heat exchanger of the multi-type air conditioner according to the first embodiment of the present invention.
  • the opening degree of the outdoor expansion valve 15 corresponding to the volume of each outdoor heat exchanger 13 is first determined by the control device 50, and the valve opening degree setting control to be set is performed. Since each outdoor heat exchanger 13 has a different volume, each outdoor heat exchanger 13 is controlled so that the defrosting of each outdoor heat exchanger 13 is completed substantially simultaneously, that is, the defrosting completion temperature is reached almost simultaneously.
  • the flow rate of the refrigerant flowing into each outdoor heat exchanger 13 is determined by the ratio. Based on the determined refrigerant flow rates, the opening degree of each outdoor expansion valve 15 of each outdoor heat exchanger 13 is determined, and the opening degree is set in each outdoor expansion valve 15. After the opening degree of the outdoor expansion valve 15 is set, the defrosting operation is started.
  • the volume of each outdoor heat exchanger 13 can be calculated from the inner diameter, length, and number of tubes. In this embodiment, as shown in FIGS. 3 and 4, it is assumed that the volume of the outdoor heat exchanger 13A is the largest, the volume of the outdoor heat exchanger 13B, and the volume of the outdoor heat exchanger 13C are the smallest. As shown in FIG. 3, since the volume of the outdoor heat exchanger 13A is the largest, the refrigerant flow rate determined based on each volume ratio is set so that the amount of refrigerant flowing into the outdoor heat exchanger 13A is maximized.
  • the opening degree of the outdoor expansion valve 15A is set. Similarly, the opening degrees of the outdoor expansion valves 15B and 15C are set simultaneously based on the volume ratios of the outdoor heat exchangers 13B and 13C. When the opening degree of each outdoor expansion valve 15 is set, the defrosting operation is performed.
  • the outdoor heat of all the outdoor heat exchangers 13 is controlled by controlling the opening degree of each outdoor expansion valve 15 according to each refrigerant flow rate obtained based on the volume ratio of each outdoor heat exchanger 13.
  • the heat exchanger temperatures detected by the exchanger temperature sensor 14 reach the defrosting completion temperature almost simultaneously, and the defrosting is completed.
  • the opening degree of the outdoor expansion valve 15 corresponding to the volume of each outdoor heat exchanger 13 is first determined and set at the start of the defrosting operation.
  • the determination and setting of the opening degree of the outdoor expansion valve 15 may be performed at the time of shipment from the factory or during a trial operation, and the opening degree of the outdoor expansion valve 15 may be stored in a storage unit (not shown) of the control device 50.
  • a multi-type air conditioner including an outdoor unit 2 including a plurality of outdoor heat exchangers 13 having different volumes of at least one outdoor heat exchanger 13 and a plurality of indoor units 3A and 3B.
  • 1 control apparatus 50 controls a refrigerant
  • the refrigerant flow rate is controlled according to the volume of each outdoor heat exchanger 13 so that the defrosting of each outdoor heat exchanger 13 is completed almost simultaneously, thereby preventing the refrigerant from re-frosting.
  • the refrigerant flow rate required for defrosting can be reduced.
  • each outdoor heat exchanger 13 is distributed by each outdoor expansion valve 15, so that the defrosting of each outdoor heat exchanger 13 is completed almost simultaneously and the defrosting operation is performed early. finish.
  • the volume of each outdoor heat exchanger 13 is a numerical value that can be acquired in advance. In the present embodiment, control can be performed from the start of the defrosting operation, and the time required for defrosting can be shortened. it can.
  • the defrosting is completed when the refrigerant flow rate required for defrosting is different due to the difference in volume, so that the same refrigerant flow rate is obtained.
  • the timing is different.
  • the refrigerant flow rate is controlled by adjusting the opening of each outdoor expansion valve 15 so that the heat exchanger temperature of each outdoor heat exchanger 13 reaches the defrosting completion temperature at the same time.
  • the opening degree of the outdoor expansion valve 15 is set for each outdoor heat exchanger 13 with reference to the defrosting completion temperature.
  • the ratio of the refrigerant flow rate of each outdoor heat exchanger 13 is determined in advance based on the volume ratio of each outdoor heat exchanger 13 so that each outdoor heat exchanger 13 reaches the defrosting completion temperature substantially simultaneously. Based on this, the opening degree of each outdoor expansion valve 15 is set. Even in an air conditioner provided with a plurality of outdoor heat exchangers 13 having different volumes, the defrosting of the outdoor heat exchangers 13 is completed at the same time, so that the refrigerant flow rate required for defrosting can be reduced.
  • the valve opening determination control of each outdoor expansion valve 15 serving as a reference is performed at the time of shipment from the factory or at the time of trial operation, and the opening is stored in the storage means. It can be appropriately stored during the valve opening determination control that is performed at the time of trial operation before starting the air-conditioning operation or at the time of shipment from the factory. Accordingly, since the refrigerant flow rate is supplied based on the reference opening during normal air-conditioning operation, the defrosting operation can be started quickly, and a plurality of outdoor heat exchangers 13 having different volumes are provided. Also in the multi-type air conditioner 1, defrosting can be completed substantially simultaneously.
  • the opening degree of the outdoor expansion valve is set based on the volume ratio of each outdoor heat exchanger at the start of the defrosting operation, and the defrosting is completed almost simultaneously.
  • the opening degree of the outdoor expansion valve is controlled. Since the other points are the same as in the first embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.
  • FIG. 5 is a flowchart showing the control of the electric expansion valve during the defrosting operation by the control device for the multi-type air conditioner according to the second embodiment of the present invention.
  • the opening degree of each outdoor expansion valve 15 corresponding to the volume of each outdoor heat exchanger 13 is set (S101). After the opening degree of each outdoor expansion valve 15 is set, the defrosting operation is started.
  • each heat exchanger temperature is detected by the outdoor heat exchanger temperature sensor 14 of each outdoor heat exchanger 13 (S102).
  • a defrosting completion temperature for example, 9 ° C.
  • step S103 determines with heat exchanger temperature having reached defrost completion temperature in step S103. If it is determined in step S103 that the heat exchanger temperature has not reached the defrosting completion temperature, the process proceeds to step S107.
  • the determination in step S103 is performed on each outdoor heat exchanger 13 in parallel.
  • the opening of the outdoor expansion valve 15A is set to the minimum opening (S104).
  • the minimum opening is an opening that allows a small amount of refrigerant to flow in such a degree that the outdoor heat exchanger 13 that has completed defrosting does not re-frost, and is, for example, about 60 pulses.
  • the process proceeds to step S110.
  • step S110 when it is determined in step S110 that the heat exchanger temperature of the outdoor heat exchanger 13A is lower than the defrosting completion temperature, the opening degree of the outdoor expansion valve 15A is gradually increased (S106). Re-frosting of the outdoor heat exchanger 13A is prevented by gradually increasing the opening of the outdoor expansion valve 15A. Specifically, for example, control for increasing the opening degree of the outdoor expansion valve 15A by x pulses / 20 s is performed n times. When the gradually increasing control of the opening degree of the outdoor expansion valve 15A is completed, the process proceeds to step S110.
  • step S107 when it is determined in step S103 that, for example, the heat exchanger temperature of the outdoor heat exchanger 13A has not reached the defrosting completion temperature, the opening degree of the outdoor expansion valve 15A is maintained (S107).
  • step S108 whether the heat exchanger temperature has reached the defrosting completion temperature in all the outdoor heat exchangers 13 (in this case, the outdoor heat exchanger 13B and the outdoor heat exchanger 13C) other than the outdoor heat exchanger 13A It is determined whether or not (S108). When it determines with the heat exchanger temperature of all the other outdoor heat exchangers 13 having reached defrost completion temperature in step S108, it changes to step S109. If it is determined in step S108 that the heat exchanger temperatures of all other outdoor heat exchangers 13 have not reached the defrosting completion temperature, the process returns to step S107.
  • step S108 for example, the heat exchanger temperature reaches the defrosting completion temperature in all the outdoor heat exchangers 13 (outdoor heat exchanger 13B and outdoor heat exchanger 13C) other than the outdoor heat exchanger 13A. Is determined as the maximum opening degree (S109). That is, the maximum opening means full opening. Then, the process proceeds to step S110.
  • step S110 it is determined whether or not all the outdoor heat exchangers 13 have reached the defrosting completion temperature. When it determines with the heat exchanger temperature in all the outdoor heat exchangers 13 having reached defrost completion temperature in step S110, a defrost operation is complete
  • FIG. 6 is a block diagram showing the refrigerant flow rate at the time of uniform defrosting of each heat exchanger of the multi-type air conditioner according to the second embodiment of the present invention.
  • steps S104 and S109 in the flowchart of FIG. As shown, the opening degree of the outdoor expansion valve 15B of the outdoor heat exchanger 13B and the outdoor expansion valve 15C of the outdoor heat exchanger 13C are set to the minimum opening degree, and the opening degree of the outdoor expansion valve 15A of the outdoor heat exchanger 13A. Is the maximum opening, that is, fully open.
  • the control device for a multi-type air conditioner the multi-type air conditioner, the control method for the multi-type air conditioner, and the control program for the multi-type air conditioner according to the present embodiment, Has the effect of. Even in the case where control is performed so that defrosting is completed at the same time in a plurality of outdoor heat exchangers 13 having different volumes, the timing of defrosting completion may be different due to various factors. When the outdoor heat exchanger 13 in which defrosting is completed earlier than the other outdoor heat exchangers 13 is present, it is unnecessary and unnecessary to supply the same amount of refrigerant flow as before completion of defrosting.
  • the opening of the outdoor expansion valve 15 is set to the minimum opening.
  • coolant flow volume can be minimized, more refrigerant
  • the timing of defrosting completion may be different due to various factors.
  • the outdoor expansion valve 15 of the other outdoor heat exchanger 13 has a minimum opening. There is a margin in the amount of refrigerant supplied. However, if the opening degree of the electric expansion valve of the outdoor heat exchanger 13 that has not been defrosted remains unchanged and the supply of the refrigerant flow rate does not increase, defrosting takes time.
  • the flow rate adjustment device is an outdoor expansion valve (electric expansion valve).
  • any other device may be used as long as the device has a function that allows the control device 50 to adjust the flow rate. Also good.

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

Abstract

La présente invention concerne un dispositif de commande de climatiseur à blocs multiples comprenant : une unité extérieure munie d'une pluralité d'échangeurs de chaleur extérieurs (13) parmi lesquels le volume d'au moins un échangeur de chaleur extérieur (13) est différent du volume d'un autre échangeur de chaleur extérieur (13) ; et une pluralité d'unités intérieures. Chacun de la pluralité d'échangeurs de chaleur extérieurs (13) est muni d'un détendeur extérieur (15) destiné à régler le débit de fluide frigorigène fourni en alimentation à l'échangeur de chaleur extérieur (13), et le débit de fluide frigorigène fourni en alimentation à chacun de la pluralité d'échangeurs de chaleur extérieurs (13) est réglé par commande des détendeurs extérieurs (15) en fonction des volumes de la pluralité d'échangeurs de chaleur extérieurs (13).
PCT/JP2017/041936 2016-12-28 2017-11-22 Dispositif de commande de climatiseur à blocs multiples, climatiseur à blocs multiples, procédé et programme de commande de climatiseur à blocs multiples WO2018123361A1 (fr)

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EP17885879.1A EP3473946A4 (fr) 2016-12-28 2017-11-22 Dispositif de commande de climatiseur à blocs multiples, climatiseur à blocs multiples, procédé et programme de commande de climatiseur à blocs multiples

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JP2016256599A JP2018109463A (ja) 2016-12-28 2016-12-28 マルチ型空気調和機の制御装置、マルチ型空気調和機、マルチ型空気調和機の制御方法及びマルチ型空気調和機の制御プログラム
JP2016-256599 2016-12-28

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CN111854057A (zh) * 2019-04-29 2020-10-30 青岛海尔空调电子有限公司 一种用于空调除霜的控制方法及装置和空调器
WO2021068358A1 (fr) * 2019-10-12 2021-04-15 青岛海信日立空调系统有限公司 Procédé de commande de dégivrage à lignes multiples
WO2023090332A1 (fr) * 2021-11-22 2023-05-25 ダイキン工業株式会社 Dispositif à cycle frigorifique

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CN110836476A (zh) * 2018-08-17 2020-02-25 青岛海尔空调器有限总公司 用于定频空调的除霜控制方法
CN110836470B (zh) * 2018-08-17 2021-07-23 青岛海尔空调器有限总公司 用于定频空调的除霜控制方法
CN110836466B (zh) * 2018-08-17 2021-09-24 青岛海尔空调器有限总公司 用于定频空调的除霜控制方法
CN110836467B (zh) * 2018-08-17 2021-07-23 青岛海尔空调器有限总公司 用于定频空调的除霜控制方法
CN109855234A (zh) * 2018-11-12 2019-06-07 青岛海尔空调器有限总公司 空调器及其制热控制方法
JP6835116B2 (ja) * 2019-02-18 2021-02-24 ダイキン工業株式会社 冷凍装置
JP7408942B2 (ja) * 2019-07-25 2024-01-09 株式会社富士通ゼネラル 空気調和装置
CN111667637A (zh) * 2020-05-11 2020-09-15 中外运冷链物流有限公司 一种计算集中制冷系统单个冷库电费的方法
CN113639413B (zh) * 2021-07-23 2023-05-26 青岛海尔空调电子有限公司 用于空调器的除霜控制方法及空调器

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Publication number Priority date Publication date Assignee Title
CN111854057A (zh) * 2019-04-29 2020-10-30 青岛海尔空调电子有限公司 一种用于空调除霜的控制方法及装置和空调器
WO2020220698A1 (fr) * 2019-04-29 2020-11-05 青岛海尔空调电子有限公司 Procédé et appareil pour commander le dégivrage d'un climatiseur, et climatiseur
CN111854057B (zh) * 2019-04-29 2022-02-22 青岛海尔空调电子有限公司 一种用于空调除霜的控制方法及装置和空调器
WO2021068358A1 (fr) * 2019-10-12 2021-04-15 青岛海信日立空调系统有限公司 Procédé de commande de dégivrage à lignes multiples
WO2023090332A1 (fr) * 2021-11-22 2023-05-25 ダイキン工業株式会社 Dispositif à cycle frigorifique
JP2023076202A (ja) * 2021-11-22 2023-06-01 ダイキン工業株式会社 冷凍サイクル装置

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