US20050086954A1 - Air conditioner having multiple outdoor units, and control method thereof - Google Patents

Air conditioner having multiple outdoor units, and control method thereof Download PDF

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Publication number
US20050086954A1
US20050086954A1 US10/967,157 US96715704A US2005086954A1 US 20050086954 A1 US20050086954 A1 US 20050086954A1 US 96715704 A US96715704 A US 96715704A US 2005086954 A1 US2005086954 A1 US 2005086954A1
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United States
Prior art keywords
outdoor units
refrigerants
operated
air conditioner
operated outdoor
Prior art date
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Abandoned
Application number
US10/967,157
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English (en)
Inventor
Jin-Seob Song
Sae-Dong Jang
Il-Nahm Hwang
Balk-Young Chung
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LG Electronics Inc
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LG Electronics Inc
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Filing date
Publication date
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Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHUNG, BALK-YOUNG, HWANG, IL-NAHM, JANG, SAE-DONG, SONG, JIN-SEOB
Publication of US20050086954A1 publication Critical patent/US20050086954A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • 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
    • F25B2313/031—Sensor arrangements
    • F25B2313/0314—Temperature sensors near the indoor 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
    • 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
    • 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
    • F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/19—Calculation of parameters
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/13—Mass flow of refrigerants
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • 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
    • F25B45/00—Arrangements for charging or discharging refrigerant

Definitions

  • the present invention relates to an air conditioner having multiple outdoor units and a control method thereof, and more particularly to, an air conditioner having multiple outdoor units which can improve performance by preventing refrigerants from being concentrated on operated outdoor units, when part of the outdoor units are operated, and a control method thereof.
  • a heat-pump type air conditioner can perform both cooling and heating. That is, the heat-pump type air conditioner provided with an indoor heat exchanger and an outdoor heat exchanger can be used as a cooling apparatus, and also used as a heating apparatus by inversing a flow of refrigerants of a refrigeration cycle.
  • FIG. 1 is a structure diagram illustrating a conventional heat-pump type air conditioner.
  • the conventional air conditioner includes a plurality of outdoor units 110 and 120 disposed outdoors and connected in parallel to each other, and at least one indoor unit 130 connected to the outdoor units 110 and 120 through refrigerant tubes 112 and 114 , and disposed indoors, for exchanging heat with indoor air.
  • the outdoor units 110 and 120 each respectively includes an outdoor heat exchanger 116 for exchanging heat with outdoor air, a four-way valve 118 for switching a flow of refrigerants in the forward or backward direction, an expansion valve 122 for changing a refrigerant gas supplied to the indoor unit 130 into low temperature low pressure, compressors 124 and 126 for compressing the refrigerants into high temperature high pressure, and an accumulator 128 for separating the refrigerants into gas and liquid, and supplying gas phase refrigerants to each compressor 124 and 126 .
  • check valves 132 for preventing an inverse flow of the refrigerants and oil separators 134 for separating oil are installed at the discharge sides of the compressors 124 and 126 , respectively.
  • Receivers 138 for preventing oil from being accumulated in the indoor unit 130 by separating oil contained in the refrigerants supplied to the indoor unit 130 are installed at discharge tubes 136 of the outdoor units 110 and 120 .
  • the discharge tubes 136 of the outdoor units 110 and 120 are connected in parallel to the refrigerant tube 114 , and the suction tubes 140 of the outdoor units 110 and 120 are connected in parallel to the refrigerant tube 112 .
  • the refrigerant tubes 112 and 114 are connected to the suction and discharge sides of the indoor unit 130 , respectively.
  • part of the outdoor units 110 and 120 are operated according to load of the indoor unit 130 or indoor and outdoor environment, and a number of the outdoor units in operation are controlled according to load variations.
  • an object of the present invention is to provide an air conditioner having multiple outdoor units which can improve performance and durability by preventing refrigerants from being excessively concentrated on operated outdoor units by compressing and storing the refrigerants in non-operated outdoor units, when part of the outdoor units are operated, and a control method thereof.
  • an air conditioner having multiple outdoor units, including: a plurality of outdoor units disposed outdoors; at least one indoor unit connected to the plurality of outdoor units through refrigerant tubes, for exchanging heat with indoor air; and when part of the outdoor units are operated, a control unit for storing refrigerants in non-operated outdoor units, so that a proper amount of refrigerants can be supplied to the operated outdoor units.
  • the outdoor units each respectively includes: an outdoor heat exchanger for exchanging heat with outdoor air; a four-way valve for switching a flow of the refrigerants in the forward or backward direction; compressors for changing the refrigerants into high temperature high pressure by compression; and a plurality of accumulators for separating the refrigerants supplied to the compressors into gas and liquid.
  • first valves for opening or closing discharge tubes of the outdoor units are mounted on the discharge tubes
  • second valves for opening or closing suction tubes of the outdoor units are mounted on the suction tubes.
  • control unit includes: a sensing unit for sensing an amount of refrigerants supplied to the operated outdoor units; and a controller for compressing and storing the refrigerants in the non-operated outdoor units, by controlling the first open/close valves and the second open/close valves installed at the suction and discharge tubes of the non-operated outdoor units according to the signal from the sensing unit.
  • a control method of an air conditioner having multiple outdoor units includes: in a partial load operation in which part of the outdoor units are operated, a first step for measuring an amount of refrigerants supplied to the operated outdoor units; when the amount of the refrigerants supplied to the operated outdoor units exceeds a set amount in the first step, a second step for compressing and storing the refrigerants in non-operated outdoor units, by closing discharge tubes of the non-operated outdoor units; and when the refrigerants are compressed and stored in the non-operated outdoor units and the amount of the refrigerants supplied to the operated outdoor units reaches the set amount in the second step, a third step for closing suction tubes of the non-operated outdoor units.
  • the first step includes the sub-steps of: sensing load of an indoor unit; when the indoor unit has a partial load state, driving part of the outdoor units; and sensing refrigerant pressures in the operated outdoor units.
  • the second step includes the sub-steps of: comparing refrigerant pressures in the high and low pressure sides of the operated outdoor units with a set pressure; when the refrigerant pressures of the operated outdoor units are higher than the set pressure, converting the non-operated outdoor units into a cooling mode; and storing the refrigerants sucked into the non-operated outdoor units in the non-operated outdoor units, by preventing discharge of the refrigerants by closing the discharge tubes of the non-operated outdoor units.
  • the third step includes the sub-steps of: deciding whether the refrigerant pressures in the high and low pressure sides of the operated outdoor units reach the set pressure; and when the refrigerant pressures of the operated outdoor units reach the set pressure, compressing and storing the refrigerants in the non-operated outdoor units, by blocking suction lines of the non-operated outdoor units.
  • FIG. 1 is a structure diagram illustrating a conventional air conditioner
  • FIG. 2 is a structure diagram illustrating an air conditioner in accordance with a preferred embodiment of the present invention
  • FIG. 3 is a block diagram illustrating a control unit of the air conditioner in accordance with the preferred embodiment of the present invention.
  • FIG. 4 is a flowchart showing sequential steps of a control method of an air conditioner in accordance with a preferred embodiment of the present invention.
  • FIG. 2 is a structure diagram illustrating an air conditioner in accordance with the preferred embodiment of the present invention.
  • the air conditioner includes a plurality of outdoor units 10 and 20 disposed outdoors, at least one indoor unit 30 connected to the plurality of outdoor units 10 and 20 through refrigerant tubes 12 and 14 , and disposed indoors, for exchanging heat with indoor air, and when part of the outdoor units 10 and 20 are operated according to load of the indoor unit 30 , a control unit for controlling a proper amount of refrigerants to be supplied to the operated outdoor units.
  • the outdoor units 10 and 20 each respectively includes an outdoor heat exchanger 22 for exchanging heat with outdoor air, a four-way valve 24 for switching a flow of the refrigerants in the forward or backward direction, compressors 26 and 28 for changing the refrigerants into high temperature high pressure by compression, a plurality of accumulators 32 for separating the refrigerants supplied to the compressors 26 and 28 into gas and liquid, and an expansion valve 34 for changing the refrigerants supplied to the indoor unit 30 into low temperature low pressure.
  • Check valves 36 for preventing an inverse flow of the refrigerants and oil separators 38 for separating oil contained in the refrigerants discharged from the compressors 26 and 28 are installed at the discharge sides of the compressors 26 and 28 , respectively.
  • Receivers 42 for preventing oil from being accumulated in the indoor unit 30 by separating oil contained in the refrigerants supplied to the indoor unit 30 are installed at discharge tubes 40 of the outdoor units 10 and 20 .
  • each of the discharge tubes 40 for discharging the refrigerants to the indoor unit 30 and the suction tubes 44 for sucking the refrigerants from the indoor unit 30 are connected respectively.
  • each of the discharge tubes 40 is connected in parallel to the first refrigerant tube 14 , and the first refrigerant tube 14 is connected to the suction side of the indoor unit 30 .
  • each of the suction tubes 44 is connected in parallel to the second refrigerant tube 12 , and the second refrigerant tube 12 is connected to the discharge side of the indoor unit 30 .
  • First valves 50 are installed at the discharge tubes 40 , respectively, for opening or closing the discharge tubes 40 for discharging the refrigerants from the outdoor units 10 and 20
  • second valves 52 are installed at the suction tubes 44 , respectively, for opening or closing the suction tubes 44 for sucking the refrigerants into the outdoor units 10 and 20 .
  • the control unit includes a load sensor 60 for sensing load of the indoor unit 30 , sensors 62 and 64 for sensing an amount of refrigerants supplied to each outdoor unit 10 and 20 , and a controller 70 for controlling driving of the compressors 26 and 28 according to the signals from the load sensor 60 and the sensors 62 and 64 , and also controlling a proper amount of refrigerants to be supplied to the operated outdoor units, by adjusting the first valves 50 and the second valves 52 .
  • the first and second valves 50 and 52 are solenoid valves for opening or closing the discharge tubes 40 and the suction tubes 44 according to the signals from the controller 70 .
  • the controller 70 wholly or partially operates the plurality of outdoor units 10 and 20 according to the load of the indoor unit 30 .
  • the first sensor 62 is a high pressure side pressure sensor installed at the refrigerant tube for discharging the refrigerants compressed in the compressors 26 and 28 , for sensing a pressure of the compressed refrigerants.
  • the second sensor 64 is a low pressure side pressure sensor installed at the refrigerant tube for supplying the refrigerants to the compressors 26 and 28 , for sensing a pressure of the refrigerants before compression.
  • FIG. 4 is a flowchart showing sequential steps of the control method of the air conditioner in accordance with the preferred embodiment of the present invention.
  • the load sensor 60 senses the load of the indoor unit 30 , and applies the sensed load to the controller 70 .
  • the controller 70 decides the number of the operated outdoor units 10 and 20 according to the signal from the load sensor 60 .
  • the indoor unit 30 performs the partial load operation, the amount of the refrigerants supplied to the operated outdoor unit 10 is sensed, and whether the amount of the refrigerants supplied to the operated outdoor unit 10 is larger than a set amount is decided (S 20 ) (It is presumed that the outdoor unit 10 is the operated outdoor unit 10 and the outdoor unit 20 is the non-operated outdoor unit).
  • the first sensor 62 installed at the operated outdoor unit 10 senses a pressure of the refrigerants compressed and discharged from the compressors 26 and 28 in the high pressure side
  • the second sensor 64 senses a pressure of the refrigerants in the low pressure side before the refrigerants are supplied to the compressors 26 and 28 .
  • Whether a proper amount of refrigerants are supplied to the operated outdoor unit 10 is decided by comparing the sensed pressures with a set pressure.
  • the refrigerants supplied to the operated outdoor unit 10 are larger than the set amount, the refrigerants are compressed and stored in the non-operated outdoor unit 20 , and thus not concentrated on the operated outdoor unit 10 .
  • the controller 70 switches the non-operated outdoor unit 20 into a cooling mode, by driving the four-way valve 24 of the non-operated outdoor unit 20 , and closes the discharge tube 40 of the non-operated outdoor unit 20 by closing the first valve 50 mounted on the non-operated outdoor unit 20 (S 30 ). Therefore, the refrigerants are not discharged from the non-operated outdoor unit 20 to the indoor unit 30 .
  • the outdoor unit 10 is operated, and the refrigerants discharged from the outdoor unit 10 are supplied to the indoor unit 30 , pass through the indoor unit 30 and exchange heat with indoor air.
  • the refrigerants discharged from the indoor unit 30 are supplied to the suction tube 44 of the non-operated outdoor unit 20 as well as the suction tube 44 of the operated outdoor unit 10 through the first refrigerant tube 12 .
  • the refrigerants sucked into the non-operated outdoor unit 20 are supplied to each element of the non-operated outdoor unit 20 , namely, the accumulator 32 , the compressors 26 and 28 and the receiver 42 . Since the discharge tube 40 of the non-operated outdoor unit 20 is closed by the first valve 50 , the refrigerants supplied to the non-operated outdoor unit 20 are compressed and stored in each element of the non-operated outdoor unit 20 .
  • the amount of the refrigerants supplied to the operated outdoor unit 10 reaches the set amount, a predetermined amount of refrigerants are stored in the non-operated outdoor unit 20 by closing the suction tube 44 of the non-operated outdoor unit 20 , and a proper amount of refrigerants are supplied to the operated outdoor unit 10 (S 40 and S 50 ).
  • the controller 70 decides that the refrigerant pressures in the high and low pressure sides of the operated outdoor unit 10 reach the set pressure according to the signals from the first and second sensors 62 and 64 mounted on the operated outdoor unit 10 , the controller 70 closes the suction tube 44 of the non-operated outdoor unit 20 by operating the second valve 52 mounted on the suction tube 44 . Accordingly, the predetermined amount of refrigerants are compressed and stored in the non-operated outdoor unit 20 . In addition, the proper amount of refrigerants are supplied to the operated outdoor unit 10 , so that the air conditioner can be efficiently driven.
  • the air conditioner having the multiple outdoor units can improve performance and durability by preventing the refrigerants from being concentrated on the operated outdoor units by compressing and storing some refrigerants in the non-operated outdoor units in the partial load operation in which part of the outdoor units are operated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
US10/967,157 2003-10-27 2004-10-19 Air conditioner having multiple outdoor units, and control method thereof Abandoned US20050086954A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR75248/2003 2003-10-27
KR10-2003-0075248A KR100504902B1 (ko) 2003-10-27 2003-10-27 복수의 실외기를 구비한 공기조화기 및 그의 냉매제어방법

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US20050086954A1 true US20050086954A1 (en) 2005-04-28

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US10/967,157 Abandoned US20050086954A1 (en) 2003-10-27 2004-10-19 Air conditioner having multiple outdoor units, and control method thereof

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US (1) US20050086954A1 (zh)
EP (1) EP1528332B1 (zh)
KR (1) KR100504902B1 (zh)
CN (1) CN1329697C (zh)
DE (1) DE602004013409T2 (zh)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060117770A1 (en) * 2004-12-06 2006-06-08 Lg Electronics Inc. Multi-air condition system and method for controlling the same
US20160223235A1 (en) * 2015-01-12 2016-08-04 Lg Electronics Inc. Air conditioner and method for controlling an air conditioner
US20170219255A1 (en) * 2013-01-31 2017-08-03 Trane International Inc. Multi-Split HVAC System
US10041706B2 (en) 2015-01-12 2018-08-07 Lg Electronics Inc. Air conditioner and method for controlling an air conditioner
US10054348B2 (en) 2015-01-12 2018-08-21 Lg Electronics Inc. Air conditioner
AU2014406800B2 (en) * 2014-09-26 2019-01-24 Gree Electric Appliances, Inc, Of Zhuhai Variable refrigerant volume system and control method thereof

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KR100700545B1 (ko) * 2005-08-10 2007-03-28 엘지전자 주식회사 복수의 압축기를 구비한 공기조화기의 운전제어장치 및방법
KR100680618B1 (ko) * 2005-09-27 2007-02-08 삼성전자주식회사 공기조화기 및 그 기동방법
JP4285583B2 (ja) * 2007-05-30 2009-06-24 ダイキン工業株式会社 空気調和装置
JP6293647B2 (ja) * 2014-11-21 2018-03-14 ヤンマー株式会社 ヒートポンプ
CN104612935B (zh) * 2015-01-16 2017-03-08 王仪靖 一种助浮提升式大容量高扬程液体高效泵送装置

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US6772600B2 (en) * 2002-06-12 2004-08-10 Lg Electronics Inc. Multi-unit air conditioner and method for controlling the same

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JPH11125476A (ja) * 1997-10-22 1999-05-11 Mitsubishi Heavy Ind Ltd 複数の室外機を有する多室形空気調和装置及びその運転方法
KR100364534B1 (ko) * 1999-10-27 2002-12-16 엘지전자 주식회사 멀티형 공기조화기
JP2002181370A (ja) * 2001-12-03 2002-06-26 Sanyo Electric Co Ltd 空気調和機
KR100474326B1 (ko) * 2002-02-25 2005-03-08 엘지전자 주식회사 멀티형 공기조화기

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Publication number Priority date Publication date Assignee Title
US5361595A (en) * 1992-02-28 1994-11-08 Sanyo Electric Co., Ltd. Air-conditioning apparatus
US5467604A (en) * 1994-02-18 1995-11-21 Sanyo Electric Co., Ltd. Multiroom air conditioner and driving method therefor
US5673570A (en) * 1994-06-29 1997-10-07 Daikin Industries, Ltd. Oil equalizing operation control device for air conditioner
US5685168A (en) * 1994-06-29 1997-11-11 Daikin Industries, Ltd. Refrigerating apparatus
US6772600B2 (en) * 2002-06-12 2004-08-10 Lg Electronics Inc. Multi-unit air conditioner and method for controlling the same
US20040134215A1 (en) * 2003-01-13 2004-07-15 Lg Electronics Inc. Multi-type air conditioner

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060117770A1 (en) * 2004-12-06 2006-06-08 Lg Electronics Inc. Multi-air condition system and method for controlling the same
US20170219255A1 (en) * 2013-01-31 2017-08-03 Trane International Inc. Multi-Split HVAC System
US10520228B2 (en) 2013-01-31 2019-12-31 Trane International Inc. Multi-split HVAC system
AU2014406800B2 (en) * 2014-09-26 2019-01-24 Gree Electric Appliances, Inc, Of Zhuhai Variable refrigerant volume system and control method thereof
US10317118B2 (en) 2014-09-26 2019-06-11 Gree Electric Appliances, Inc. Of Zhuhai Variable refrigerant volume system and control method thereof
US20160223235A1 (en) * 2015-01-12 2016-08-04 Lg Electronics Inc. Air conditioner and method for controlling an air conditioner
US10041706B2 (en) 2015-01-12 2018-08-07 Lg Electronics Inc. Air conditioner and method for controlling an air conditioner
US10054348B2 (en) 2015-01-12 2018-08-21 Lg Electronics Inc. Air conditioner
US10527333B2 (en) * 2015-01-12 2020-01-07 Lg Electronics Inc. Air conditioner and method for controlling an air conditioner

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CN1641277A (zh) 2005-07-20
KR100504902B1 (ko) 2005-07-29
EP1528332B1 (en) 2008-04-30
KR20050040081A (ko) 2005-05-03
DE602004013409T2 (de) 2008-07-31
CN1329697C (zh) 2007-08-01
EP1528332A1 (en) 2005-05-04
DE602004013409D1 (de) 2008-06-12

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