US20210254880A1 - Air conditioner and method for controlling an air conditioner - Google Patents

Air conditioner and method for controlling an air conditioner Download PDF

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Publication number
US20210254880A1
US20210254880A1 US17/177,452 US202117177452A US2021254880A1 US 20210254880 A1 US20210254880 A1 US 20210254880A1 US 202117177452 A US202117177452 A US 202117177452A US 2021254880 A1 US2021254880 A1 US 2021254880A1
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Prior art keywords
heat exchanger
refrigerant
outdoor heat
row
pipe
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Abandoned
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US17/177,452
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English (en)
Inventor
Hyungyul YUM
Eunjun Cho
Pilhyun Yoon
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LG Electronics Inc
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Lg Electronics Inc
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Publication of US20210254880A1 publication Critical patent/US20210254880A1/en
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    • 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
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14—Heat exchangers specially adapted for separate outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/26—Refrigerant piping
    • F24F1/30—Refrigerant piping for use inside the separate outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
    • 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
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • 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
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0232—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with bypasses
    • F25B2313/02322—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with bypasses during 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0315—Temperature sensors near the outdoor heat exchanger
    • 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
    • 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
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0403—Refrigeration circuit bypassing means for the condenser
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2501—Bypass valves
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2515—Flow valves

Definitions

  • An air conditioner and a method for controlling an air conditioner are disclosed herein.
  • an air conditioner is a device for cooling or heating indoor air by using a refrigeration cycle apparatus including a compressor, an outdoor heat exchanger, an expansion device, and an indoor heat exchanger.
  • the outdoor heat exchanger functions as a condenser
  • the indoor heat exchanger functions as an evaporator, in which the refrigerant sequentially circulates through the compressor, the outdoor heat exchanger, the expansion device, the indoor heat exchanger, and the compressor.
  • the outdoor heat exchanger functions as an evaporator
  • the indoor heat exchanger functions as a condenser, in which the refrigerant sequentially circulates through the compressor, the indoor heat exchanger, the expansion device, the outdoor heat exchanger, and the compressor.
  • a defrosting operation may be performed if necessary.
  • a refrigerant having a lower temperature than the outside air flows through the outdoor heat exchanger, and absorbs heat from the outside air.
  • moisture contained in the outside air may be condense on a surface of the outdoor heat exchanger, and in a cold place, the moisture may be frozen on the surface of the outdoor heat exchanger.
  • the surface of the outdoor heat exchanger is frozen, a problem occurs in that heat exchange does not take place properly, thereby reducing heating efficiency. Accordingly, if necessary, it is required to perform a defrosting operation to remove the ice.
  • the refrigerant circulates in a reverse direction to a direction of a heating operation, and circulates in a similar direction to a circulation direction of the refrigerant during a cooling operation.
  • the temperature of the refrigerant during the defrosting operation is always lower than the temperature of the refrigerant during the cooling operation, and the refrigerant flowing through an inlet pipe of the compressor has a very low temperature and a very low pressure. Accordingly, a rotational speed (Hz) of the compressor is inevitably reduced, thereby resulting in poor defrosting performance.
  • a combined cooling/heating air conditioner has a problem in that a refrigerant pipe installed at an outlet end of an outdoor heat exchanger is designed to have a small diameter to secure cooling performance, thereby increasing pressure loss and reducing defrosting performance.
  • FIG. 1 is a schematic diagram illustrating an air conditioner during a heating operation according to an embodiment
  • FIG. 1A is a control block diagram of the air conditioner of FIG. 1 ;
  • FIG. 2 is a schematic diagram illustrating the air conditioner of FIG. 1 during a cooling operation
  • FIG. 3 is a schematic diagram illustrating the air conditioner of FIG. 1 during a defrosting operation
  • FIG. 4 is a flow chart of a method for controlling an air conditioner according to an embodiment
  • FIG. 5 is a schematic diagram illustrating an air conditioner during a defrosting operation according to another embodiment
  • FIG. 5A is a control block diagram of the air conditioner of FIG. 5 ;
  • FIG. 6 is a flow chart of a method for controlling an air conditioner according to another embodiment.
  • FIG. 1 is a schematic diagram of an air conditioner according to an embodiment.
  • FIG. 1A is a control block diagram of the air conditioner of FIG. 1 .
  • the air conditioner may include a compressor 1 , an outdoor heat exchanger 2 , an expansion device (valve) 3 , and an indoor heat exchanger 4 .
  • the compressor 1 , the outdoor heat exchanger 2 , the expansion device 3 , and the indoor heat exchanger 4 may be connected by refrigerant pipes.
  • the compressor 1 , the outdoor heat exchanger 2 , and the expansion device 3 may form an outdoor unit.
  • the outdoor unit may include an outdoor blower (fan) (not shown) that blows air to the outdoor heat exchanger 2 .
  • outdoor blower fan
  • outside air may be introduced into the outdoor unit, heat exchanged with the outdoor heat exchanger 2 , and then discharged to the outside.
  • the indoor heat exchanger 4 may be included in an indoor unit.
  • the indoor unit may further an indoor blower (fan) (not shown) that blows air to the indoor heat exchanger 4 .
  • indoor blower fan
  • indoor air may be introduced into the indoor unit, heat exchanged with the indoor heat exchanger 4 , and then discharged indoors.
  • the outdoor heat exchanger 2 may function as a condenser, and the indoor heat exchanger 4 may function as an evaporator.
  • the refrigerant may sequentially circulate through the compressor 1 , the outdoor heat exchanger 2 , the expansion device 3 , the indoor heat exchanger 4 , and the compressor 1 .
  • the outdoor heat exchanger 2 may function as an evaporator, and the indoor heat exchanger 4 may function as a condenser.
  • the refrigerant may sequentially circulate through the compressor 1 , the indoor heat exchanger 4 , the expansion device 3 , the outdoor heat exchanger 2 , and the compressor 1 .
  • the compressor 1 may compress the refrigerant.
  • the condenser may condense the refrigerant having passed through the compressor 1 .
  • the expansion device 3 may expand the refrigerant having passed through the condenser.
  • the evaporator may evaporate the refrigerant having passed through the expansion device 3 .
  • the air conditioner may be an air conditioner capable of both the cooling operation and the heating operation. However, the air conditioner may also be provided as an air conditioner capable of only the heating operation.
  • the air conditioner according to an embodiment may further include a cooling/heating switching valve 7 .
  • the cooling/heating switching valve 7 may be included in the outdoor unit.
  • the cooling/heating switching valve 7 may switch a flow direction of the refrigerant, discharged from the compressor 1 , to either the outdoor heat exchanger 2 or the indoor heat exchanger 4 .
  • Compressor intake passages 81 , 8 , and 85 may connect an outlet of the outdoor heat exchanger 2 during the heating operation and an inlet of the compressor 1 .
  • the compressor intake passages 81 , 8 , and 85 may include an accumulator 8 that separates liquid refrigerant from gaseous refrigerant; first refrigerant pipe 81 that connects an outlet of the outdoor heat exchanger 2 during the heating operation and an inlet of the accumulator 8 ; and compressor inlet pipe 85 that connects an outlet of the accumulator 8 and the inlet of the compressor 1 .
  • the liquid refrigerant and the gaseous refrigerant may flow to the accumulator 8 from the outdoor heat exchanger 2 through the first refrigerant pipe 81 , and the refrigerant, flowing to the accumulator 8 , may be separated into the liquid refrigerant and the gaseous refrigerant.
  • the liquid refrigerant, separated at the accumulator 8 may be accommodated in a lower portion of the accumulator 8 , and the gaseous refrigerant separated at the accumulator 8 may be accommodated above the separated liquid refrigerant.
  • the gaseous refrigerant, separated at the accumulator 8 may flow into the compressor 1 through the compressor inlet pipe 85 , and the liquid refrigerant separated at the accumulator 8 , may remain in the accumulator 8 .
  • a second refrigerant pipe 82 may connect an outlet of the indoor heat exchanger 82 during the heating operation and an inlet of the expansion device 3 during the heating operation.
  • a third refrigerant pipe 83 may connect an outlet of the expansion device 3 during the heating operation and the inlet of the outdoor heat exchanger 2 during the heating operation.
  • a fourth refrigerant pipe 84 may connect the outlet of the compressor 1 and the inlet of the indoor heat exchanger 4 during the heating operation.
  • the cooling/heating switching valve 7 may be installed at or in the first refrigerant pipe 81 and the fourth refrigerant pipe 84 .
  • the outdoor heat exchanger 2 may be a fin-tube type heat exchanger.
  • the outdoor heat exchanger 2 may include with a plurality of fins arranged one above the other, and tubes passing through the plurality of fins several times.
  • a refrigerant passage, through which the refrigerant circulates, may be formed in the tubes.
  • the outdoor heat exchanger 2 may include a refrigerant passage divided into a plurality of unit passages.
  • the refrigerant passage is divided into three unit passages; however, embodiments are not limited thereto, and may also be divided into four or more or two or less unit passages.
  • the refrigerant passage of the outdoor heat exchanger 2 is divided into upper, middle, and lower passages.
  • the refrigerant passage of the outdoor heat exchanger 2 may include a plurality of rows on a side portion thereof.
  • three rows are formed; however, embodiments are not limited thereto, and three or more rows may be formed, as is known to those skilled in the art.
  • the outdoor heat exchanger 2 may include first row 21 connected to the first refrigerant pipe 81 connected to the compressor 1 .
  • the outdoor heat exchanger 2 may include a third row 23 connected to the third refrigerant pipe 83 connected to the expansion device 3 .
  • the outdoor heat exchanger 2 may include second row 22 disposed between the first row 21 and the third row 23 .
  • a tube disposed in the first row 21 has one or a first side connected to the first refrigerant pipe 81 connected to the compressor 1 , and the other or a second side connected to a tube disposed in the second row 22 .
  • a tube disposed in the second row 22 has one or a first side connected to the tube in the first row 21 , and the other or a second side connected to a tube in the third row 23 .
  • the tube disposed in the third row 23 has one or a first side connected to the tube in the second row 22 , and the other or a second side connected to the second refrigerant pipe 82 connected to the expansion device 3 .
  • the first refrigerant pipe 81 may be connected to the tube disposed at an upper side of the first row 21 .
  • the refrigerant may flow from an upper side to a lower side.
  • the tube in the second row 22 and the tube in the first row 21 may communicate with each other at a lower end.
  • the refrigerant may flow from the lower side to the upper side.
  • the tube in the third row 23 and the tube in the second row 22 may communicate with each other at an upper end.
  • the refrigerant may flow from the upper side to the lower side.
  • the third refrigerant pipe 83 may be connected to the tube disposed at a lower side of the third row 23 .
  • a flow direction of the refrigerant in the first row 21 may be opposite to a flow direction of the refrigerant in the second row 22 .
  • the flow direction of the refrigerant in the second row 22 may be opposite to a flow direction of the refrigerant in the third row 23 .
  • a flow direction of the refrigerant in the first row 21 is a downward direction
  • a flow direction of the refrigerant in the second row 22 may be an upward direction
  • a flow direction of the refrigerant in the third row 23 may be a downward direction.
  • At least one or more temperature sensors may be disposed in the outdoor heat exchanger 2 .
  • the outdoor heat exchanger 2 may include a first outdoor heat exchanger temperature sensor 221 and a second outdoor heat exchanger temperature sensor 231 .
  • a temperature THEX of the outdoor heat exchanger 2 which is controlled by a processor 300 , may be a temperature measured by the first outdoor heat exchanger temperature sensor 221 .
  • the first outdoor heat exchanger temperature sensor 221 may be disposed in the second row 22 .
  • the first outdoor heat exchanger temperature sensor 221 may be disposed in the outdoor heat exchanger 2 at a position adjacent to a defrosting bypass pipe 86 .
  • the first outdoor heat exchanger temperature sensor 221 may be disposed in the outdoor heat exchanger 2 at a position adjacent to a common bypass pipe 86 c .
  • the first outdoor heat exchanger temperature sensor 221 may be disposed at a connection point between the common bypass pipe 86 c and the outdoor heat exchanger 2 .
  • the first outdoor heat exchanger temperature sensor 221 may measure a temperature of the refrigerant bypassed from the outdoor heat exchanger 2 to the defrosting bypass pipe 86 , and may transmit the measured data to processor 300 .
  • the second outdoor heat exchanger temperature sensor 231 may be disposed in the third row 23 .
  • the second outdoor heat exchanger temperature sensor 231 may be disposed in the outdoor heat exchanger 2 at a position adjacent to the third refrigerant pipe 83 .
  • the second outdoor heat exchanger temperature sensor 231 may be disposed at a connection point between the third refrigerant pipe 83 and the outdoor heat exchanger 2 .
  • the second outdoor heat exchanger temperature sensor 231 may measure a temperature of the refrigerant discharged from the outdoor heat exchanger 2 to the third refrigerant pipe 83 , and may transmit the measured data to the processor 300 .
  • the first temperature sensor 221 and the second temperature sensor 231 may be disposed at a position corresponding to the middle refrigerant passage and may be disposed at a position corresponding to the lower refrigerant passage.
  • the defrosting bypass pipe 86 has one or a first end connected to the outdoor heat exchanger 2 and the other or a second end connected to the inlet pipe 85 of the compressor 1 .
  • the defrosting bypass pipe 86 is a device for bypassing a portion of the refrigerant, flowing through the outdoor heat exchanger 2 , to the compressor 1 .
  • the first end of the defrosting bypass pipe 86 may be connected to the outdoor heat exchanger 2 , and the refrigerant may flow therethrough.
  • the defrosting bypass pipe 86 may be connected to the tube in the second row 22 of the outdoor heat exchanger 2 .
  • the defrosting bypass pipe 86 may be connected in parallel to each of the upper, middle, and lower passages.
  • the defrosting bypass pipe 86 may be connected to a middle of the tube in the second row 22 of the outdoor heat exchanger 2 .
  • the defrosting bypass pipe 86 may be connected at a center of the tube of the second row 22 , but as illustrated in FIG. 1 , the defrosting bypass pipe 86 may be connected at a position as close to the center of the tube of the second row 22 as possible.
  • the second end of the defrosting bypass pipe 86 may be connected to the inlet pipe 85 of the compressor 1 .
  • the defrosting bypass pipe 86 may be connected to the inlet pipe 85 of the compressor 1 to allow the bypassed refrigerant to flow into the compressor 1 .
  • the defrosting bypass pipe 86 has effects in that by bypassing a portion of the refrigerant to the compressor 1 , it is possible to prevent pressure of the refrigerant flowing into the compressor 1 from dropping to a level lower than a threshold, and by increasing a temperature of the refrigerant flowing into the compressor 1 to a sufficient level, defrosting performance may be improved.
  • a defrosting bypass valve 87 may be disposed at or in the defrosting bypass pipe 86 and is a device for opening and closing the defrosting bypass pipe 86 .
  • the defrosting bypass valve 87 may open the defrosting bypass pipe 86 during the heating operation of the air conditioner, and may close the defrosting bypass pipe 86 during the cooling operation hereof.
  • the defrosting bypass valve 87 may be an opening/closing valve, and may control an amount of the refrigerant flowing through the defrosting bypass pipe 86 .
  • the processor 300 is a device for controlling operation of the air conditioner.
  • the processor 300 may be disposed in the air conditioner.
  • the processor 300 may perform controlling operations, such as controlling operation of the compressor 1 , controlling opening and closing of the expansion device 3 , and controlling opening and closing of an air outlet of the air conditioner or changing a discharge angle thereof, for example. Further, in addition to the controlling operations, the processor 300 may perform a control method which may be easily adopted by those skilled in the art.
  • the processor 300 may control the defrosting bypass valve 87 .
  • the processor 300 may bypass the refrigerant to the inlet pipe 85 of the compressor 1 .
  • the processor 300 may close the defrosting bypass valve 87 so as not to bypass the refrigerant.
  • the predetermined period of time is a time corresponding to a pressure of the refrigerant introduced into the compressor 1 , at which the refrigerant is sufficient to maintain defrosting performance.
  • the processor 300 may open the defrosting bypass valve 87 and bypass the refrigerant to compensate for the pressure of the refrigerant introduced into the compressor 1 .
  • the processor 300 may close the defrosting bypass valve 87 so as not to bypass the refrigerant.
  • the processor 300 may calculate the predetermined period of time according to a temperature of the outdoor heat exchanger 2 .
  • the processor 300 may open the defrosting bypass valve 87 , and if the temperature of the refrigerant in the outdoor heat exchanger 2 is higher than or equal to the predetermined reference temperature, the processor 30 may close the defrosting bypass valve 87 .
  • the reference temperature may be stored in the processor 300 , and may be determined through experiment.
  • the reference temperature is a temperature of the refrigerant in the outdoor heat exchanger 2 , which corresponds to the pressure of the refrigerant at which the refrigerant introduced into the compressor 1 is sufficient to achieve defrosting performance although the refrigerant is not bypassed.
  • the refrigerant introduced into the compressor 1 has a sufficiently high pressure to achieve required defrosting performance.
  • the processor 300 may close the defrosting bypass valve 87 when the temperature of the refrigerant, bypassed from the outdoor heat exchanger 2 , reaches 12° C.
  • the temperature of the refrigerant is 12° C.
  • a pressure of the refrigerant introduced into the compressor 1 is sufficient to achieve defrosting performance even when the refrigerant is not bypassed.
  • the refrigerant compressed by the compressor 1 , flows to the cooling/heating switching valve 7 through a first portion of the fourth refrigerant pipe 84 .
  • the refrigerant, flowing to the cooling/heating switching valve 7 flows to the indoor heat exchanger 4 through a second portion of the fourth refrigerant pipe 84 .
  • the refrigerant flows to the expansion device 3 through the second refrigerant pipe 82 .
  • the refrigerant flowing to the expansion device 3 flows to the outdoor heat exchanger 2 through the third refrigerant pipe 83 .
  • the refrigerant flows to the cooling/heating switching valve 7 through a first portion of the first refrigerant pipe 81 .
  • the refrigerant flows to the accumulator 8 through a second portion of the first refrigerant pipe 81 .
  • the refrigerant flows to the compressor 1 through the compressor inlet pipe 85 . During the heating operation of the air conditioner, the flow of the refrigerant is repeated in this manner.
  • the refrigerant compressed by the compressor 1 , flows to the cooling/heating switching valve 7 through a first portion of the fourth refrigerant pipe 84 .
  • the refrigerant flows to the outdoor heat exchanger 2 through the first portion of the first refrigerant pipe 81 .
  • the refrigerant flows to the expansion device 3 through the second refrigerant pipe 82 .
  • the refrigerant flows to the indoor heat exchanger 4 through the second refrigerant pipe 82 .
  • the refrigerant flows to the cooling/heating switching valve 7 through a second portion of the fourth refrigerant pipe 84 .
  • the refrigerant flows to the accumulator 8 through the second portion of the first refrigerant pipe 81 .
  • the refrigerant flows to the compressor 1 through the compressor inlet pipe 85 . During the cooling operation of the air conditioner, the flow of refrigerant is repeated in this manner.
  • the refrigerant compressed by the compressor 1 , flows to the cooling/heating switching valve 7 through the first portion of the fourth refrigerant pipe 84 .
  • the refrigerant flows to the outdoor heat exchanger 2 through the first portion of the first refrigerant pipe 81 , and removes moisture or ice formed on the outdoor heat exchanger 2 .
  • the refrigerant flows to the expansion device 3 through the second refrigerant pipe 82 .
  • the refrigerant flows to the indoor heat exchanger 4 through the second refrigerant pipe 82 .
  • the refrigerant flows to the cooling/heating switching valve 7 through a second portion of the fourth refrigerant pipe 84 .
  • the refrigerant flows to the accumulator 8 through the second portion of the first refrigerant pipe 81 .
  • the refrigerant flows to the compressor 1 through the compressor inlet pipe 85 . During the normal defrosting operation of the air conditioner, the flow of refrigerant is repeated in this manner.
  • a high-speed defrosting operation may be partially included.
  • a time for the high-speed defrosting operation is controlled by the processor 300 .
  • the processor 300 may include some of the high-speed defrosting operation.
  • the processor 300 may start the high-speed defrosting operation, and after a predetermined period of time has elapsed, the processor 300 may terminate the high-speed defrosting operation and may start the normal defrosting operation.
  • the refrigerant compressed by the compressor 1 , flows to the cooling/heating switching valve 7 through the first portion of the fourth refrigerant pipe 84 .
  • the refrigerant flows to the outdoor heat exchanger 2 through the first portion of the first refrigerant pipe 81 .
  • a portion of the refrigerant flowing to the outdoor heat exchanger 2 flows through the bypass pipe 86 connected to the second row 22 , and the remaining refrigerant passes through the third row 23 to flow through the second refrigerant pipe 82 .
  • the portion of the refrigerant flowing through the bypass pipe 86 is joined with the remaining refrigerant at the inlet pipe 85 of the compressor 1 to flow into the compressor 1 .
  • the remaining refrigerant flows into the compressor 1 by passing through the expansion device 3 in the same manner as the normal defrosting operation, and is joined with the portion of the refrigerant at the inlet pipe 85 of the compressor 1 .
  • the flow of the refrigerant is repeated in this manner.
  • a portion of the refrigerant is branched while flowing through the outdoor heat exchanger 2 , to be bypassed to the inlet pipe 85 of the compressor 1 .
  • a pressure of the remaining refrigerant drops while the refrigerant passes through the expansion device 3 , and while the refrigerant passes through other components, pressure loss increases such that the pressure of the refrigerant flowing into the compressor 1 further drops. Accordingly, the pressure of the refrigerant at the inlet pipe 85 of the compressor 1 is too low to provide proper defrosting performance.
  • the bypassed portion of the refrigerant is joined to compensate for the pressure drop, thereby producing an effect of providing defrosting performance of the air conditioner.
  • the third refrigerant pipe 83 connected to an outlet end of the outdoor heat exchanger 2 , is required to have a sufficiently large diameter, but if the third refrigerant pipe 83 is large, there is a problem in that cooling performance is greatly reduced. Accordingly, by performing the high-speed defrosting operation before the normal defrosting operation, defrosting performance may be provided at an early stage of the defrosting operation even when the third refrigerant pipe 83 has a sufficiently small diameter, and cooling performance may also be maintained.
  • the processor 300 may provide general defrosting operation performance.
  • the proper time may be a time when the temperature of the heat exchanger is higher than or equal to a reference temperature, and may be a time when the pressure of the refrigerant at the inlet pipe 85 of the compressor 1 is sufficient to properly provide defrosting performance.
  • FIG. 5 is a diagram illustrating an air conditioner according to another embodiment.
  • FIG. 5A is a control block diagram of the air conditioner of FIG. 5 .
  • the same components as those of the previous embodiment will be denoted by the same or like reference numerals and description thereof has been omitted, and the following description will be focused on different points.
  • the defrosting bypass pipe 86 may be connected to the middle of the outdoor heat exchanger 2 . More specifically, the common bypass pipe 86 c of the defrosting bypass pipe 86 may be connected to the middle of the outdoor heat exchanger 2 . One or a first end of the common bypass pipe 86 c may be branched into at least two pipes and the branched pipes may be referred to as a “first bypass pipe 86 a ” and a “second bypass pipe 86 b”.
  • the first bypass pipe 86 a may be branched from the common bypass pipe 86 c , and may be connected to the inlet pipe 85 of the compressor 1 . That is, the first bypass pipe 86 a may be connected to the inlet pipe 85 of the compressor 1 as in the previous embodiment.
  • a first bypass valve 87 a may be disposed on or in the first bypass pipe 86 a.
  • the second bypass pipe 86 b may be branched from the common bypass pipe 86 c , and may be connected to an inlet pipe of the accumulator 8 . A portion of the refrigerant branched from the common bypass pipe 86 c may pass through the second bypass pipe 86 b to flow into the inlet pipe of the accumulator 8 .
  • the portion of the refrigerant may flow into the accumulator 8 to be separated into liquid refrigerant and gaseous refrigerant.
  • the gaseous refrigerant separated at the accumulator 8 may flow into the compressor 1 through the inlet pipe of the compressor 1 , and the liquid refrigerant separated at the accumulator 8 may remain in the accumulator 8 .
  • the processor 300 may perform a portion of the high-speed defrosting operation, which is similar to the control method of the previous embodiment. However, unlike the previous embodiment, the processor 300 may selectively open and close the first bypass valve 87 a and the second bypass valve 87 b.
  • the processor 300 may open the second bypass valve 87 b , and if the temperature of the refrigerant is higher than or equal to the predetermined reference temperature, the processor 300 may close the second bypass valve 87 b.
  • the processor 300 may guide the bypassed refrigerant to the inlet pipe of the accumulator 8 .
  • the refrigerant bypassed to the inlet pipe of the accumulator 8 may be mixed with the refrigerant having passed through the indoor heat exchanger 4 , and may flow into the accumulator 8 .
  • the refrigerant flowing into the accumulator 8 may be separated into liquid refrigerant and gaseous refrigerant.
  • the gaseous refrigerant separated at the accumulator 8 may pass through the compressor inlet pipe to flow into the compressor 1 , and the liquid refrigerant separated at the accumulator 8 may remain in the accumulator 8 .
  • the air conditioner according to the embodiments disclosed herein have an effect of maintaining defrosting performance by preventing abnormal pressure drop occurring at the inlet pipe 85 of the compressor 1 at the early stage of the defrosting operation when the refrigerant, branched from the middle of the outdoor heat exchanger 2 , is bypassed to the inlet pipe 85 of the compressor 1 .
  • the air conditioner also has an effect of improving defrosting performance at the early stage of the defrosting operation.
  • the third refrigerant pipe 83 having a relatively small diameter may be designed to have a much smaller diameter, thereby producing an effect of improving cooling performance.
  • Embodiments disclosed herein provide an air conditioner, in which defrosting performance may be maintained by increasing pressure of a refrigerant in a compressor inlet pipe at an early stage of a defrosting operation. Embodiments disclosed herein further provide an air conditioner capable of rapidly defrosting the ice frozen on an outdoor heat exchanger by minimizing pressure loss caused when the refrigerant flows.
  • Embodiments disclosed herein provide an air conditioner that may include a compressor configured to compress a refrigerant; an indoor heat exchanger disposed at a pipe connected to the compressor, and configured to perform heat exchange between the refrigerant and indoor air; an outdoor heat exchanger disposed at a pipe which is connected to the compressor and which is different from the pipe where the indoor heat exchanger is disposed, and configured to perform heat exchange between the refrigerant and outside air; and an expansion device disposed at a pipe connecting the indoor heat exchanger and the outdoor heat exchanger, and configured to expand the refrigerant.
  • the air conditioner may also include a defrosting bypass pipe having one or a first end connected to a middle point of the outdoor heat exchanger, and the other or a second end connected to an inlet pipe of the compressor; a defrosting bypass valve disposed at or in the defrosting bypass pipe; and a processor configured to open and close the defrosting bypass valve according to a temperature of the refrigerant flowing into the compressor through an inlet pipe of the compressor.
  • an air conditioner may include a compressor configured to compress a refrigerant; an indoor heat exchanger disposed at a pipe connected to the compressor, and configured to perform heat exchange between the refrigerant and indoor air; an outdoor heat exchanger disposed at a pipe which is connected to the compressor and which is different from the pipe where the indoor heat exchanger is disposed, and configured to perform heat exchange between the refrigerant and outside air; an expansion device disposed at a pipe connecting the indoor heat exchanger and the outdoor heat exchanger, and configured to expand the refrigerant.
  • the air conditioner may also include a defrosting bypass pipe having one or a first end connected to a middle point of the outdoor heat exchanger, and the other or a second end connected to an inlet pipe of the compressor; and a defrosting bypass valve disposed at the defrosting bypass pipe.
  • the outdoor heat exchanger may include a first row in which a tube connected to the pipe connected to the compressor is disposed; a third row in which a tube connected to a pipe connected to the expansion device is disposed; and a second row, which is disposed between the first row and the third row, and in which a tube connecting the tube in the first row and the tube in the third row is disposed.
  • the defrosting bypass pipe may be connected to the tube disposed in the second row.
  • a flow direction of the refrigerant in the first row may be opposite to a flow direction of the refrigerant in the second row. Further, in the outdoor heat exchanger, a lower end of the second row may communicate with the first row, and an upper end of the second row may communicate with the third row.
  • the processor may open the defrosting bypass valve. In response to the temperature of the refrigerant in the outdoor heat exchanger being higher than or equal to the predetermined temperature, the processor may close the defrosting bypass valve.
  • the air conditioner may further include an accumulator disposed between the indoor heat exchanger and the compressor.
  • the defrosting bypass pipe may include a common bypass pipe connected to the outdoor heat exchanger; a first bypass pipe branched from the common bypass pipe and connected to the inlet pipe of the compressor; and a second bypass pipe branched from the common bypass pipe and connected to an inlet pipe of the accumulator.
  • the defrosting bypass valve may include a first bypass valve disposed on the first bypass pipe, and a second bypass valve disposed on the second bypass pipe.
  • the processor may selectively open and close the first bypass valve or the second bypass valve. In response to the temperature of the refrigerant in the outdoor heat exchanger being lower than the predetermined reference temperature, the processor may open the second bypass valve, and in response to the temperature of the refrigerant in the outdoor heat exchanger being higher than or equal to the predetermined reference temperature, the processor may close the second bypass valve.
  • Embodiments disclosed herein provide a method of controlling an air conditioner including a compressor, an outdoor heat exchanger, an expansion device, and an indoor heat exchanger.
  • the method may include performing a high-speed defrosting operation of opening a defrosting bypass valve disposed at a defrosting bypass pipe having one or a first end connected to a middle point of the outdoor heat exchanger, and the other or a second end connected to an inlet pipe of the compressor; and in response to the temperature of a refrigerant in the outdoor heat exchanger being higher than or equal to a reference temperature, performing a normal defrosting operation of closing the defrosting bypass valve.
  • the defrosting bypass pipe may include a common bypass pipe connected to the outdoor heat exchanger; a first bypass pipe branched from the common bypass pipe and connected to the inlet pipe of the compressor; and a second bypass pipe branched from the common bypass pipe and connected to an inlet pipe of the accumulator.
  • the performing of the high-speed defrosting operation may include selectively opening and closing the first bypass valve disposed on the first bypass pipe or the second bypass valve disposed on the second bypass pipe according to the temperature of the refrigerant in the outdoor heat exchanger.
  • the performing of the high-speed defrosting operation may include, in response to the temperature of the refrigerant in the outdoor heat exchanger being lower than the predetermined reference temperature, opening the second bypass valve, and in response to the temperature of the refrigerant in the outdoor heat exchanger being higher than or equal to the predetermined reference temperature, closing the second bypass valve.
  • An air conditioner according to embodiments disclosed herein has at least the following advantages.
  • a portion of the refrigerant may be branched from the middle of the outdoor heat exchanger at an early stage of the defrosting operation and is bypassed to the compressor inlet pipe, such that pressure of the refrigerant flowing into the compressor through the compressor inlet pipe at the early stage of the defrosting operation may be secured, thereby maintaining defrosting performance.
  • a portion of the refrigerant may be branched from the middle of the outdoor heat exchanger, and is bypassed directly to the compressor inlet pipe without passing through other components, such that pressure loss of the refrigerant may be minimized.
  • a portion of the refrigerant, branched from a common bypass valve may be bypassed to an inlet pipe of an accumulator, so that a condensed refrigerant, present in the branched portion of the refrigerant, may be separated at the accumulator, and only a vaporized refrigerant may be guided to the compressor, thereby achieving defrosting performance.
  • first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first element, component, region, layer or section could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
  • spatially relative terms such as “lower”, “upper” and the like, may be used herein for ease of description to describe the relationship of one element or feature to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “lower” relative to other elements or features would then be oriented “upper” relative to the other elements or features. Thus, the exemplary term “lower” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
  • Embodiments of the disclosure are described herein with reference to cross-section illustrations that are schematic illustrations of idealized embodiments (and intermediate structures) of the disclosure. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments of the disclosure should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing.
  • 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.
  • the appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment.

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  • 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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JP7460783B2 (ja) 2024-04-02
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