US20120266616A1 - Multi-type air conditioner and method of controlling the same - Google Patents

Multi-type air conditioner and method of controlling the same Download PDF

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Publication number
US20120266616A1
US20120266616A1 US13/424,577 US201213424577A US2012266616A1 US 20120266616 A1 US20120266616 A1 US 20120266616A1 US 201213424577 A US201213424577 A US 201213424577A US 2012266616 A1 US2012266616 A1 US 2012266616A1
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United States
Prior art keywords
outdoor
defrosting operation
devices
heat exchanger
air conditioner
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Abandoned
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US13/424,577
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English (en)
Inventor
Hoki LEE
Sanghun Lee
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LG Electronics Inc
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LG Electronics Inc
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Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Lee, Hoki, LEE, SANGHUN
Publication of US20120266616A1 publication Critical patent/US20120266616A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • 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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0251—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units being defrosted alternately
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0253—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in parallel arrangements
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/029—Control issues
    • F25B2313/0294—Control issues related to the outdoor fan, e.g. controlling speed
    • 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
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • F25B2347/02—Details of defrosting cycles
    • F25B2347/021—Alternate defrosting
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors

Definitions

  • a multi-type air conditioner and a method of controlling a multi-type air conditioner are disclosed herein.
  • Multi-type air conditioners are known. However, they suffer from various disadvantages.
  • FIG. 1 is a block diagram of a multi-type air conditioner according to an embodiment
  • FIG. 2 is a circuit diagram of a refrigerant cycle of the multi-type air conditioner of FIG. 1 ;
  • FIG. 3 is a circuit diagram of a refrigerant flow when the multi-type air conditioner of FIG. 1 performs a cooling operation
  • FIG. 4 is a flowchart of a method of controlling a multi-type air conditioner according to an embodiment
  • FIGS. 5 to 8 are block diagrams illustrating successive defrosting operations of a plurality of outdoor devices.
  • FIGS. 9 and 10 are circuit diagrams of a refrigerant flow when a specific outdoor device performs a defrosting operation, FIG. 9 illustrating a refrigerant flow when a fourth outdoor device performs a defrosting operation, and FIG. 10 illustrating a refrigerant flow when a first outdoor device performs a defrosting operation.
  • an air conditioner is an apparatus that cools/heats an indoor space or purifies indoor air using a refrigerant cycle including a compressor, a condenser, an expansion mechanism, and an evaporator to provide a comfortable indoor environment for users.
  • Air conditioners may be classified as an air conditioner in which a single indoor device is connected to a single outdoor device or a multi-type air conditioner in which a plurality of indoor devices is connected to a single outdoor device to provide the effect of a plurality of air conditioners.
  • the multi-type air conditioner may include a plurality of indoor devices and a plurality of outdoor devices.
  • Each of the plurality of outdoor devices may include an outdoor heat exchanger.
  • Each of the outdoor heat exchangers may be divided into an upper heat exchanger part and a lower heat exchanger part on the basis of a flow of refrigerant. Thus, refrigerant may independently flow into the upper and lower heat exchanger parts.
  • frost may develop on the outdoor heat exchanger.
  • a defrosting operation should be performed.
  • the frost on the upper heat exchanger part of each of the plurality of outdoor heat exchangers may be removed first. Then, when the frost on the upper heat exchanger part is completely removed, the frost on the lower heat exchanger part may be removed.
  • a high-temperature, high-pressure refrigerant discharged from a compression device may be bypassed to flow into the heat exchanger part in which the defrosting operation has been performed.
  • frost on the upper heat exchanger part may be completely removed, and then, the frost on the lower heat exchanger part removed, the frost on a boundary between the upper heat exchanger part and the lower heat exchanger part may not be smoothly removed. Thus, frost may remain on the boundary.
  • an amount of refrigerant flowing into the outdoor heat exchanger may be less. Thus, it may take a relatively long time to remove the frost.
  • FIG. 1 is a block diagram of an air conditioner according to an embodiment.
  • FIG. 2 is a circuit diagram of a refrigerant cycle of the multi-type air conditioner of FIG. 1 .
  • FIG. 2 illustrates a refrigerant flow when the multi-type air conditioner of FIG. 1 performs a heating operation.
  • the multi-type air conditioner may include an outdoor device 1 , an indoor device 2 connected to the outdoor device 1 through a distributor 3 , a controller (not shown) that controls operations of the multi-type air conditioner, and a memory (not shown).
  • the outdoor device 1 may include a plurality of outdoor devices 11 , 12 , 13 , and 14 .
  • the indoor device may 2 include a plurality of indoor devices 21 , 22 , 23 , and 24 .
  • the present disclosure is not limited to this number of indoor and outdoor devices. That is, two or more indoor devices may be connected to two or more outdoor devices. Further, the number of indoor device may be greater than the numbers of outdoor devices.
  • the outdoor device 1 may include a first outdoor device 11 , a second outdoor device 12 , a third outdoor device 13 , and a fourth outdoor device 14 .
  • the first outdoor device 11 may have the same configuration as that of each of the second to fourth outdoor devices 12 , 13 , and 14 . Thus, only the configuration of the first outdoor device 11 will be described hereinbelow.
  • the descriptions of the first outdoor device 11 may be equally applied to those of the second to fourth outdoor devices. Also, reference numerals used for explaining the configuration of the first outdoor device 11 may be equally applied to those of the second to fourth outdoor device.
  • Each of the outdoor devices 11 , 12 , 13 , and 14 may include a compression device 110 that compresses a refrigerant, and outdoor heat exchangers 130 , 200 , 210 , and 220 , in which outdoor air is heat-exchanged with the refrigerant.
  • the compression device 110 may include one or more compressors.
  • the compression device 110 which may include a plurality of compressors 111 , 112 , and 113 , will be described as an example.
  • One or more of the plurality of compressors 111 , 112 , and 113 may be an inverter compressor, such as compressor 111 , having a variable capacity, and others may be a constant-speed compressors, such as compressors 112 and 113 .
  • the plurality of compressors 111 , 112 , and 113 may be disposed in parallel. One or more of the plurality of compressors 111 , 112 , and 113 or all of the plurality of compressors 111 , 112 , and 113 may be operated according to a capacity of the indoor device.
  • a discharge side tube of each of the compressors 111 , 112 , and 113 may include an individual tube 118 and a joint tube 119 . That is, the individual tube 118 of each of the compressors 111 , 112 , and 113 may be jointed to the joint tube 119 .
  • the individual tube 118 may include an oil separator 114 , 115 , or 116 that separates oil from the refrigerant, a temperature sensor 126 that detects a temperature of the compressed refrigerant, and a compression sensor 127 that detects a pressure of the compressed refrigerant.
  • the joint tube 119 may be connected to a plurality of valves 121 and 122 , which may be 4-way valves, that switch a flow of the refrigerant.
  • the plurality of valves 121 and 122 may include a first valve 121 and a second valve 122 .
  • the first and second valves 121 and 122 may be disposed in parallel.
  • Each of the first and second valves 121 and 122 may be connected to the outdoor heat exchanger 130 through first connection tubes 123 and 124 , respectively.
  • the first connection tubes 123 and 124 may include a first heat exchanger part connection tube 123 and a second heat exchanger connection tube 124 .
  • Each of the outdoor heat exchangers 130 , 200 , 210 , and 220 may include a plurality of heat exchanger parts.
  • the plurality of heat exchanger parts may include a first heat exchanger part 131 and a second heat exchanger part 132 .
  • the first and second heat exchanger parts 131 and 132 may be independent heat exchangers separated from each other, or a single heat exchanger divided into two parts based on refrigerant flow.
  • the first valve 121 may be connected to the first heat exchanger part 131 through the first heat exchanger part connection tube 123
  • the second valve 122 may be connected to the second heat exchanger part 132 through the second heat exchanger part connection tube 124 .
  • the first and second heat exchanger parts 131 and 132 may be disposed in parallel. Further, the first and second heat exchanger parts 131 and 132 may be horizontally or vertically disposed with respect to each other.
  • the refrigerant may flow into each of the first and second heat exchanger parts 131 and 132 , or only one of the first and second heat exchanger parts 131 and 132 .
  • the refrigerant may flow into the first heat exchanger part 131 in a direction opposite to that of the refrigerant flowing into the second heat exchanger part 132 . That is, the first and second heat exchanger parts 131 and 132 may be independently operated.
  • each of the heat exchangers may independently serve as a condenser or an evaporator.
  • each of the outdoor heat exchangers may be divided into the plurality of heat exchanger parts and may include a plurality of valves in this embodiment, the present disclosure is not so limited.
  • a single valve may be connected to the outdoor heat exchanger.
  • the refrigerant within the outdoor heat exchanger may be heat-exchanged with outdoor air blown by a fan motor assembly 140 , which may include an outdoor fan and a fan motor.
  • a plurality of fan motor assemblies may be provided.
  • FIG. 1 illustrates two outdoor fan motor assemblies; however, embodiments are not limited to this number of outdoor fan motor assemblies.
  • each of the valves 121 and 122 may be connected to an accumulator 135 through the second connection tube 134 . Additionally, each of the valves 121 and 122 may be connected to closed tubes 121 a and 122 a.
  • Each of the outdoor devices 11 , 12 , and 13 , and 14 may further include an outdoor expansion mechanism 150 .
  • the outdoor expansion mechanism 150 does not expand a refrigerant when the refrigerant passes through the outdoor heat exchangers 130 , 200 , 210 , and 220 , but rather, expands refrigerant which does not pass through the outdoor heat exchangers 130 , 200 , 210 , and 220 .
  • the outdoor expansion mechanism 150 may include a first outdoor expansion valve 151 corresponding to the first heat exchanger part 131 and a second outdoor expansion valve 152 corresponding to the second heat exchanger part 132 .
  • the first and second outdoor expansion valves 151 and 152 may be disposed in parallel. That is, the refrigerant expanded by the first outdoor expansion valve 151 may flow into the first heat exchanger part 131 , and the refrigerant expanded by the second outdoor expansion valve 152 may flow into the second heat exchanger part 132 .
  • Each of the outdoor expansion valves 151 and 152 may be an electronic expansion valve (EEV), for example.
  • EEV electronic expansion valve
  • Each of the outdoor devices 11 , 12 , 13 , and 14 may be connected to the distributor 3 through a low pressure gas tube 311 and a low pressure connection tube 312 . Also, each of the outdoor devices 11 , 12 , 13 , and 14 may be connected to the distributor 3 through a high pressure tube 321 and a high pressure connection tube 322 . Additionally, each of the outdoor devices 11 , 12 , 13 , and 14 may be connected to the distributor 3 through a liquid tube 331 and a liquid connection tube 332 .
  • the low pressure gas tube 311 may be connected to the second connection tube 134 and the low pressure connection tube 312 .
  • the high pressure tube 321 may be connected to the joint tube 119 and the high pressure connection tube 322 , which may be disposed downflow from the valves 121 and 122 .
  • the liquid tube 331 may be connected to the outdoor expansion mechanism 150 and the liquid connection tube 332 .
  • the distributor 3 may be connected to the plurality of indoor devices 21 , 22 , 23 , and 24 and the outdoor device 1 to control refrigerant flow.
  • the distributor 3 may be connected to each of the indoor devices 21 , 22 , 23 , and 24 through an indoor gas tube 313 and an indoor liquid tube 333 .
  • the distributor 3 may include a low pressure gas pipe 31 , a high pressure gas pipe 32 , a liquid pipe 33 , a low pressure valve 314 , and a high pressure valve 324 .
  • the low pressure connection tube 312 and the indoor gas tube 313 may be connected to the low pressure gas pipe 31
  • the indoor liquid tube 333 and the liquid connection tube 332 may be connected to the liquid pipe 33 .
  • the high pressure connection tube 322 and a branch tube 323 connected to the indoor liquid tube 333 may be connected to the high pressure gas pipe 32 .
  • the low pressure gas tube 311 may include first valves 315 and 316
  • the high pressure gas tube 321 may include second valves 325 and 326
  • the liquid tube 331 may include third valves 335 and 336 .
  • the indoor gas tube 313 may include the low pressure valve 314 , and the high pressure valve 324 may be connected to the branch tube 323 .
  • the low pressure valve 314 and the high pressure valve 324 may be, for example, an EEV, in which an opening degree thereof may be adjusted linearly or in a stepwise fashion.
  • Each of the indoor devices 21 , 22 , 23 , and 24 may include indoor heat exchangers 211 , 221 , 231 , and 241 , indoor fans 212 , 222 , 232 , and 242 , and indoor expansion mechanisms 213 , 223 , 233 , and 243 .
  • Each of the indoor expansion mechanisms 213 , 223 , 233 , and 243 may be an EEV, for example.
  • a high temperature refrigerant discharged from the compression device 110 of the plurality of outdoor devices 11 , 12 , 13 , and 14 may flow toward the indoor device.
  • the low pressure valve 314 may be closed, and the high pressure valve 324 opened.
  • the first valves 315 and 316 disposed in the low pressure gas tube 311 may be closed.
  • the high-temperature, high-pressure refrigerant discharged from the compression device 110 may flow into the high pressure gas pipe 32 along the high pressure gas tube 321 by adjusting the refrigerant flow through the valves 121 and 122 . Because the joint tube 119 communicates with the closed tubes 121 a and 122 a via the valves 121 and 122 , the refrigerant does not flow from an end of the closed tubes 121 a and 122 a, and thus, flows along the high pressure gas tube 321 .
  • the refrigerant flowing into the high pressure gas pipe 32 may flow into each of the indoor heat exchangers 211 , 221 , 231 , and 241 through the branch tube 323 and the indoor gas tube 313 . Then, the refrigerant may be condensed in the indoor heat exchangers 211 , 221 , 231 , and 241 and pass through the indoor expansion mechanisms 213 , 223 , 233 , and 243 , without being expanded, to flow into the liquid pipe 33 through the indoor liquid tube 333 .
  • the refrigerant flowing into the liquid pipe 33 may flow along the liquid connection tube 332 and the liquid tube 331 .
  • the refrigerant may be expanded by the outdoor expansion mechanism 150 to flow into the outdoor heat exchangers 130 , 200 , 210 , and 220 .
  • the refrigerant may be evaporated while passing through the outdoor heat exchangers 130 , 200 , 210 , and 220 , and then the refrigerant may pass through each of the valves 121 and 122 to flow into the accumulator 135 .
  • a gaseous portion of the refrigerant introduced into the accumulator 135 may be introduced into the compression device 110 .
  • frost may occur or form on the outdoor heat exchangers 130 , 200 , 210 , and 220 .
  • a defrosting operation to remove the frost from the outdoor heat exchangers 130 , 200 , 210 , and 220 may be required. The defrosting operation will be described later.
  • FIG. 3 is a circuit diagram of a refrigerant flow when the multi-type air conditioner performs a cooling operation. Referring to FIG. 3 , a cooling operation will be described hereinbelow.
  • a refrigerant discharged from the compression device 130 of the plurality of outdoor devices 11 , 12 , 13 , and 14 may flow toward the outdoor heat exchangers 130 , 200 , 210 , and 220 .
  • the high pressure valve 324 may be closed, and the low pressure valve 314 opened.
  • the second valves 325 and 326 disposed in the high pressure gas tube 321 may be closed.
  • the high-temperature, high-pressure refrigerant discharged from the compression device 110 may flow into each of the outdoor heat exchangers 130 , 200 , 210 , and 220 along the first connection tubes 123 and 124 by adjusting the refrigerant flow through the valves 121 and 122 . Then, the refrigerant may be condensed while passing through the outdoor heat exchangers 130 , 200 , 210 , and 220 to pass through the outdoor expansion mechanism 150 without being expanded. The refrigerant passing through the outdoor expansion mechanism 150 may flow into the liquid pipe 33 along the liquid tube 331 and the liquid connection tube 332 .
  • the refrigerant flowing into the liquid pipe 33 may be expanded while passing through the indoor liquid tube 333 to flow into each of the indoor expansion mechanisms 213 , 223 , 233 , and 243 .
  • the expanded refrigerant may be evaporated while passing through each of the indoor heat exchangers 211 , 221 , 231 , and 241 .
  • the evaporated refrigerant may flow into the low pressure gas pipe 31 along the indoor gas tube 313 .
  • the refrigerant flowing into the low pressure gas pipe 31 may flow into the second connection tube 134 along the low pressure connection tube 312 and the low pressure gas tube 311 .
  • the refrigerant may be introduced into the accumulator 135 .
  • a gaseous portion of the refrigerant introduced into the accumulator 135 may be introduced into the compression device 110 .
  • FIG. 4 is a flowchart of a method for controlling a multi-type air conditioner according to an embodiment.
  • FIGS. 5 to 8 are block diagram illustrating successive defrosting operations of a plurality of outdoor devices.
  • FIGS. 9 and 10 are circuit diagrams of a refrigerant flow when a specific outdoor device performs a defrosting operation, FIG. 9 illustrating a refrigerant flow when a fourth outdoor device performs a defrosting operation, and FIG. 10 illustrating a refrigerant flow when a first outdoor device performs a defrosting operation.
  • the multi-type air conditioner such as the multi-type air conditioner of FIG. 1 , may perform a heating operation according to a heating operation command, in step S 1 .
  • a controller may determine that a defrosting operation condition or conditions is satisfied during the heating operation of the multi-type air conditioner.
  • whether the defrosting operation conditions are satisfied may be determined, for example, by comparing an outlet tube temperature of the outdoor heat exchanger to an outdoor temperature. Because the plurality of outdoor devices are operated at the same time, time points at which the defrosting operation conditions are satisfied in the plurality of outdoor devices may be similar to each other. However, the time points at which the defrosting operation conditions are satisfied in the outdoor devices may be different from each other. In a case in which the defrosting operation conditions are satisfied in the multi-type air conditioner, the defrosting operation conditions may be satisfied in all of the outdoor devices or in a certain number of the outdoor devices.
  • whether the defrosting operation conditions are satisfied may be determined through various methods including the above-described method. That is, the present disclosure is not limited to any particular method for determining whether the defrosting operation conditions are satisfied.
  • the multi-type air conditioner when the defrosting operation conditions are satisfied, the multi-type air conditioner may be operated in a defrosting operation mode. More specifically, in step S 3 , the plurality of outdoor devices may be successively operated in the defrosting operation mode. That is, one outdoor device may perform the defrosting operation, while the remaining outdoor devices may perform the heating operation. When one outdoor device completely performs the defrosting operation, the next outdoor device may perform the defrosting operation.
  • an order of the outdoor devices performing the defrosting operation may be decided based on a capacity (a heat exchange capacitor) of each of the outdoor devices. That is, in a case in which all or a portion of the outdoor devices have capacities different from each other, the outdoor device having a relatively small capacity may perform the defrosting operation first. If all or a portion of the outdoor devices have the same capacity, the outdoor devices may perform the defrosting operation according to a preset order. That is, during manufacture, an order of the outdoor devices performing the defrosting operation may be set, and this order stored in a memory (not shown). When the defrosting operation conditions are satisfied, the defrosting operation may be performed according to the preset order. A change of the previously decided order may be impossible or possible.
  • a capacity a heat exchange capacitor
  • the order of the outdoor devices performing the deforesting operation may be decided whenever the defrosting operation conditions are satisfied.
  • the outdoor devices may perform the defrosting operation in an order based on a time point (i.e. from the fastest time point) at which the defrosting operation conditions are satisfied for each outdoor device.
  • the outdoor devices may perform the defrosting operation in an order of a fourth indoor device, a third indoor device, a second indoor device, and a first indoor device.
  • the outdoor heat exchanger 220 of the fourth outdoor device 14 may switched into a condenser state by switching the refrigerant flow through the valve of the fourth outdoor device 14 . That is, as shown in FIG. 5 , the plurality of heat exchanger parts of the fourth outdoor device 14 may be switched into the condenser state.
  • Each of the outdoor heat exchanger 130 , 200 , and 210 of the first to third indoor devices 11 , 12 , and 13 may be maintained in an evaporator state, and each of the indoor heat exchangers 211 , 221 , 231 , and 241 of each of the indoor devices 21 , 22 , 23 , and 24 may be maintained in the condenser state.
  • the high-temperature, high-pressure refrigerant discharged from the compression device of the fourth outdoor device 14 may flow into the outdoor heat exchanger 220 via the valve.
  • frost on the outdoor heat exchanger 220 may be removed.
  • the refrigerant passing through the outdoor heat exchanger 220 of the fourth outdoor device 14 may flow along the liquid tube 331 of the fourth outdoor device 14 , and then, the refrigerant together with the refrigerant discharged from the liquid pipe 33 may be introduced into the liquid tube 331 of the first outdoor device 11 .
  • the second valve 326 disposed in the high pressure gas tube 321 of the fourth outdoor device 14 may be closed during the defrosting operation of the fourth outdoor device 14 .
  • An operation of the fan motor assembly 140 disposed in the fourth outdoor device 14 may be stopped during the defrosting operation of the fourth outdoor device 14 .
  • an opening degree of the outdoor expansion valve 151 , 152 of the fourth outdoor device 14 may be greater than that of the previous state (i.e., an opening degree of the outdoor expansion valve when the outdoor heat exchanger of the fourth outdoor device serves as an evaporator).
  • a portion of the refrigerant evaporated while passing through the outdoor heat exchanger in the first to third outdoor devices 11 , 12 , and 13 may flow into the accumulator 135 of the first to third outdoor devices 11 , 12 , and 13 .
  • the other portion of the refrigerant may flow into the accumulator 135 of the fourth outdoor device 14 along the low pressure gas tube 311 .
  • the outdoor heat exchanger 220 of the fourth outdoor device 14 may be switched into the evaporator state by switching the refrigerant flow through the valve.
  • the third outdoor device 13 may perform the defrosting operation.
  • the outdoor heat exchanger 210 of the third outdoor device 13 may serve as the condenser, and the outdoor heat exchangers of the remaining outdoor devices may serve as the evaporators.
  • the second outdoor device 12 may perform the defrosting operation, as shown in FIG. 7 .
  • the outdoor heat exchanger 210 of the second outdoor device 12 may serve as the condenser, and the outdoor heat exchangers of the remaining outdoor devices may serve as the evaporators.
  • the first outdoor device 11 may perform the defrosting operation.
  • the outdoor heat exchanger 130 of the first outdoor device 11 may be switched to the condenser state by switching the refrigerant flow through the valve.
  • Each of the outdoor heat exchangers of the second to fourth outdoor devices 12 , 13 , and 14 may be maintained in the evaporator state, and each of the indoor heat exchangers 211 , 221 , 231 , and 241 of the each of the indoor devices 21 , 22 , 23 , and 24 may be maintained in the condenser state.
  • the high-temperature, high-pressure refrigerant discharged from the compression device of the first outdoor device 11 may flow into the outdoor heat exchanger 130 via the valve.
  • frost on the outdoor heat exchanger 130 may be removed.
  • the refrigerant passing through the outdoor heat exchanger 130 of the first outdoor device 11 may flow along the liquid tube 331 of the first outdoor device 11 , and then, the refrigerant together with the refrigerant discharged from the liquid pipe 33 may be introduced into the liquid tubes 331 of the second to fourth outdoor devices 12 , 13 , and 14 .
  • the second valve 325 disposed in the high pressure gas tube 321 of the first outdoor device 11 may be closed during the defrosting operation of the first outdoor device 11 .
  • An operation of the fan motor assembly 140 disposed in the first outdoor device 11 may be stopped during the defrosting operation of the first outdoor device 11 .
  • an opening degree of the outdoor expansion valve 151 , 152 of the first outdoor device 11 may be greater than that of the previous state (i.e., an opening degree of the outdoor expansion valve when the outdoor heat exchanger of the first outdoor device serves as an evaporator).
  • the defrosting operation of the first outdoor device 11 When the defrosting operation of the first outdoor device 11 is completed, the defrosting operation of all of the outdoor devices may be determined to be completed, in step S 4 . Then, the defrosting process may return to step S 1 , and each of the outdoor heat exchangers 130 , 200 , 210 , and 220 of each of the outdoor devices 11 , 12 , 13 , and 14 may be switched to the evaporator state.
  • the indoor device may perform a heating operation during a defrosting operation of the air conditioner, the indoor space may be continuously heated to maintain a comfortable indoor space. Also, because the outdoor heat exchangers do not perform the defrosting operation at the same time, but rather, successively perform the defrosting operation, deterioration of heating performance may be minimized. Further, because the frost on all of the outdoor heat exchangers of each of the outdoor devices may be removed, frost may be preventing from remaining on a portion of the outdoor heat exchangers.
  • Embodiments disclosed herein provide a multi-type air conditioner and a method of controlling a multi-type air conditioner in which a defrosting operation may be performed in a state in which deterioration of heating performance may be minimized.
  • a multi-type air conditioner may include a plurality of indoor units or devices, each including an indoor heat exchanger; and a plurality of outdoor units or devices connected to the plurality of indoor units, each including an outdoor heat exchanger, wherein, when a defrosting operation condition is satisfied during a heating operation, the plurality of outdoor units may successively perform a defrosting operation.
  • a multi-type air conditioner may include a plurality of indoor units or devices, each including an indoor heat exchanger; and a plurality of outdoor units or devices connected to the plurality of indoor units, each including an outdoor heat exchanger, wherein, when a defrosting operation condition is satisfied during a heating operation, the outdoor heat exchanger of one outdoor unit of the plurality of outdoor units may be switched into a condenser state to perform a defrosting operation.
  • a method of controlling a multi-type air conditioner including a plurality of indoor units or devices and a plurality of outdoor units or devices may include performing a heating operation in the plurality of outdoor units; determining whether a defrosting operation condition is satisfied during the heating operation of the plurality of outdoor units; and successively performing a defrosting operation in the plurality of outdoor units when the defrosting operation condition is satisfied.
  • any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc. means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention.
  • the appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment.

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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)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
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CN105091421A (zh) * 2015-08-06 2015-11-25 美的集团武汉制冷设备有限公司 冷媒循环系统及空调系统
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US20170153050A1 (en) * 2013-11-25 2017-06-01 Samsung Electronics Co., Ltd. Air conditioner
US20170198955A1 (en) * 2014-05-28 2017-07-13 Daikin Industries, Ltd. Refrigeration apparatus
US10480837B2 (en) * 2014-05-28 2019-11-19 Daikin Industries, Ltd. Refrigeration apparatus
US20160091215A1 (en) * 2014-09-29 2016-03-31 Lee Wa Wong Air Conditioning and Heat Pump System with Evaporative Cooling System
US9933171B2 (en) * 2014-09-29 2018-04-03 Lee Wa Wong Air conditioning and heat pump system with evaporative cooling system
US20180328636A1 (en) * 2016-01-15 2018-11-15 Daikin Industries, Ltd. Refrigeration apparatus
US20190032978A1 (en) * 2016-01-15 2019-01-31 Daikin Industries, Ltd. Refrigeration apparatus
US10473374B2 (en) * 2016-01-15 2019-11-12 Daikin Industries, Ltd. Refrigeration apparatus for oil and defrost control
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US20210348789A1 (en) * 2018-12-11 2021-11-11 Mitsubishi Electric Corporation Air-conditioning apparatus
US11885518B2 (en) * 2018-12-11 2024-01-30 Mitsubishi Electric Corporation Air-conditioning apparatus
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EP2515053A2 (en) 2012-10-24
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