US20050081540A1 - System and method for controlling air conditioner - Google Patents

System and method for controlling air conditioner Download PDF

Info

Publication number
US20050081540A1
US20050081540A1 US10/929,456 US92945604A US2005081540A1 US 20050081540 A1 US20050081540 A1 US 20050081540A1 US 92945604 A US92945604 A US 92945604A US 2005081540 A1 US2005081540 A1 US 2005081540A1
Authority
US
United States
Prior art keywords
compressor
temperature
predetermined
outdoor
discharge temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/929,456
Other languages
English (en)
Inventor
Il Hwang
Young Park
Yoon Lee
Dong Yang
Seok Yoon
Jong Park
Sung Choi
Sung Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Assigned to LG ELECTRONICS INC. reassignment LG ELECTRONICS INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHOI, SUNG OH, HWANG, IL NAHM, KIM, SUNG CHUN, LEE, YOON BEEN, PARK, JONG HAN, PARK, YOUNG MIN, YANG, DONG JUN, YOON, SEOK HO
Publication of US20050081540A1 publication Critical patent/US20050081540A1/en
Priority to US12/105,458 priority Critical patent/US20080209928A1/en
Abandoned legal-status Critical Current

Links

Images

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
    • 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
    • F25B49/022—Compressor control 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
    • 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
    • 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
    • F25B49/025—Motor control 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
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor 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
    • F25B2313/025—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
    • 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
    • F25B2400/06—Several compression cycles arranged in parallel
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • 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
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air
    • 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
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present invention relates to a system and method for controlling an air conditioner, and more particularly, to a system and method for controlling an air conditioner, which can uniformly maintain high and low pressures for respective cooling and heating modes by disposing a pressure regulating tube between main and sub outdoor heat exchangers.
  • the present invention further relates to a system and method for controlling an air conditioner that can prevent a liquid refrigerant from one-sidedly flowing to one of main and sub compressors by controlling the air conditioner based on an exhaust temperature of the compressors and an exhaust temperature according to an environmental condition.
  • an air conditioner can be classified according to its function into a cooling-only type, a heating-only type, and a cooling-heating type.
  • the air conditioner can be further classified according to its unit constitution into an integral type where a cooking unit and a heat discharge unit are integrated and a separation type where a cooling unit is disposed at an indoor and heat discharge and compressing units are disposed at an outdoor.
  • the separation type includes a multi-type where more than two indoor units are connected to a singe outdoor unit to control air in a plurality of indoor spaces.
  • FIG. 1 shows a prior multi-type air conditioner.
  • a prior multi-type air conditioner comprises a plurality of indoor units 20 a , 20 b and 20 c disposed in the respective indoors and an outdoor unit.
  • the air conditioner can be selectively operated in cooling and heating modes.
  • the outdoor unit is divided into a main outdoor unit 10 and a sub outdoor unit 10 a .
  • the main outdoor unit 10 comprises an inverter compressor 11 for varying a driving RPM by varying an operating frequency, a constant compressor 11 a driven constantly, an accumulator 14 for separating liquid, a four-way valve 13 , a condenser 15 for heat-exchanging, and an outdoor fan 16 .
  • the sub outdoor unit 10 a has an identical structure to the main outdoor unit 10 .
  • Each of the indoor units 20 a , 20 b and 20 c comprises a dispenser 21 , an expansion valve 22 a , ( 22 b and 22 c ), an indoor heat exchangers 23 a ( 23 b and 23 c ), and an indoor fan 24 a ( 24 b and 24 c ).
  • gaseous refrigerant introduced from the indoor heating exchangers 23 a , 23 b and 23 c into the compressors 11 , 11 a , 12 and 12 a of the main and sub outdoor units 10 and 10 a is compressed into a high-temperature/high-pressure state by the compressors 11 , 11 a , 12 and 12 a and is discharged to outdoor heat exchangers 15 and 15 a through the four-way valves 13 and 13 a that are converted for realizing a cooling cycle.
  • the refrigerant discharged into the main and sub outdoor heat exchangers 15 and 15 a is phase-changed into a high-temperature/high-pressure liquid state by being heat-exchanged with outdoor air introduced into the outdoor units 10 and 10 a by the outdoor fans 16 and 16 a.
  • the phase-changed refrigerant is directed to the expansion valves 22 a , 22 b and 22 c of the indoor units 20 a , 20 b and 20 c through the dispenser 21 .
  • the refrigerant directed to the expansion valves 22 a , 22 b and 22 c is changed into a low-temperature/low-pressure liquid state and is then directed to the indoor heat exchangers 23 a , 23 b and 23 c.
  • the refrigerant directed to the indoor heat exchangers 23 a , 23 b and 23 c is heat-exchanged with air around the heat exchangers to be phase-changed into a low-temperature/low-pressure gaseous state and is then introduced into the compressors 11 , 11 a , 12 and 12 a through the four way valves 13 and 13 a.
  • the refrigerant pressure-reduced through the expansion valves 22 a , 22 b and 22 c is heat-exchanged in the respectively heat exchangers 23 a , 23 b and 23 c , in the course of which the ambient air is changed into cool air and is then discharged into the indoors by the indoor fans 24 a , 24 b and 24 c , completing a cycle of cooling process.
  • the heating mode is operated in an opposite cycle to that of the cooling mode. That is, as shown in FIG. 2 , low-temperature/low-pressure gaseous refrigerant introduced from the outdoor heating exchangers (condensers) 15 and 15 a into the compressors 11 , 11 a , 12 and 12 a of the main and sub outdoor units 10 and 10 a is compressed into a high-temperature/high-pressure gaseous state by the compressors 11 , 11 a , 12 and 12 a and is discharged to the indoor heat exchangers 23 a , 23 b and 23 c through the four-way valves 13 and 13 a that are converted for realizing a heating cycle.
  • the refrigerant discharged into the indoor heat exchangers 23 a , 23 b and 23 c is phase-changed into a high-temperature/high-pressure liquid state by being heat-exchanged with indoor air.
  • the phase-changed refrigerant is directed to the expansion valves 22 a , 22 b and 22 c , in the course of which, the ambient air is changed into warm air by being heat-exchanged with the high-temperature/high-pressure refrigerant and is then discharged into the indoors to increase the temperature of the indoor air.
  • the refrigerant directed to the expansion valves 22 a , 22 b and 22 c is changed into a low-temperature/low-pressure liquid state and is then directed to the outdoor heat exchangers 15 and 15 a .
  • the refrigerant directed to the outdoor heat exchangers 15 and 15 a is heat-exchanged with air introduced into the main and sub outdoor units 10 and 10 a to be phase-changed into a low-temperature/low-pressure gaseous state and is then introduced into the compressors 11 , 11 a , 12 and 12 a through the four way valves 13 and 13 a.
  • the deterioration of the heat-exchange efficiency deteriorates the heating capability of the indoor units 20 a , 20 b and 20 c , thereby deteriorating the reliability of the air conditioner.
  • the liquid refrigerant is inclined into one of the main and sub compressors. This may cause the compressors to be damaged.
  • the present invention is directed to a system and method for controlling an air conditioner, which substantially obviate one or more problems due to limitations and disadvantages of the related art.
  • a system for controlling an air conditioner comprising: a plurality of outdoor units each having at least one compressor and an outdoor heat exchanger; an indoor unit connected to the outdoor units by a refrigerant tube, the indoor unit having an indoor heat exchanger; and a pressure regulating tube for equalizing pressure according to an operation mode, the pressure regulating tube being connected between the outdoor units.
  • a method for controlling an air conditioner comprising the steps of: determining if a compressor is driven for more than a predetermined time; measuring a discharge temperature of the compressor when the compressor is driven for more than the predetermined time; comparing the measured temperature with a predetermined temperature; and controlling an opening of an electronic expansion valve is controlled such that the discharge temperature can be increased to be higher than a current super heating when the measured temperature is lower than the predetermined temperature.
  • a method for controlling an air conditioner comprising the steps of: determining if a compressor is driven for more than a predetermined time; measuring a discharge temperature of the compressor when the compressor is driven for more than the predetermined time; comparing the measured temperature with a temperature predetermined according to an outdoor temperature; and controlling an opening of an electronic expansion valve is controlled such that the discharge temperature can be increased to be higher than a current super heating when the measured temperature is lower than the predetermined temperature.
  • a method for controlling an air conditioner comprising the steps of: determining if a compressor is driven for more than a predetermined time; measuring a discharge temperature of the compressor when the compressor is driven for more than the predetermined time; comparing the measured temperature with a temperature predetermined according to a vaporizing temperature; and controlling an opening of an electronic expansion valve is controlled such that the discharge temperature can be increased to be higher than a current super heating when the measured temperature is lower than the predetermined temperature.
  • a method for controlling an air conditioner comprising the steps of: driving a first compressor; determining if the first compressor is driven for more than a predetermined time; measuring a discharge temperature of the first compressor when the first compressor is driven for more than the predetermined time; comparing the measured temperature with a predetermined temperature; replacing the first compressor with a second compressor when the measured temperature is lower than the predetermined temperature; and vaporizing liquid refrigerant in the first compressor by pre-heating liquid refrigerant in the first compressor.
  • the pressure regulating tube is disposed between the main outdoor heat exchanger and the sub outdoor heat exchanger, the formation of the frost on the main outdoor heat exchanger can prevented, thereby improving the reliability of the air conditioner.
  • the pressure regulating tube equalizes the refrigerant pressures directed to the main and sub outdoor heat exchangers, the frost is not formed on the main outdoor heat exchanger, improving the heat exchange efficiency and the reliability of the air conditioner.
  • the one-sided flow of the refrigerant to one of the main and sub compressors can be prevented by control factors such as the discharge temperature of the compressors, the outdoor temperature, and/or the vaporizing temperature, thereby preventing the compressors from being damaged.
  • FIG. 1 is a schematic view illustrating a cooling cycle of a multi air conditioner according to the prior art
  • FIG. 2 is a schematic view illustrating a heating cycle of a multi air conditioner according to the prior art
  • FIGS. 3 and 4 are schematic views of a multi air conditioner according to an embodiment of the present invention.
  • FIGS. 5 a and 5 b are schematic views illustrating a pressure regulating process between main and sub outdoor heat exchangers through a pressure regulating tube in a cooling mode according to an embodiment of the present invention
  • FIGS. 6 a and 6 b are schematic views illustrating a pressure regulating process between main and sub outdoor heat exchangers through a pressure regulating tube in a heating mode according to an embodiment of the present invention
  • FIG. 7 is a flowchart illustrating a method for preventing liquid refrigerant from one-sidedly flow to one of main and sub compressors in a heating mode by comparing a discharge temperature of a compressor driven for above a predetermined time with a predetermined discharge temperature according to a first embodiment of the present invention
  • FIG. 8 is a graph illustrating a discharge temperature considering an outdoor temperature
  • FIG. 9 is a flowchart illustrating a method for preventing liquid refrigerant from one-sidedly flow to one of main and sub compressors in a heating mode by comparing a discharge temperature of a compressor driven for above a predetermined time with a discharge temperature predetermined according to an outdoor temperature according to a second embodiment of the present invention
  • FIG. 10 is a graph illustrating a discharge temperature considering a vaporizing temperature
  • FIG. 11 is a flowchart illustrating a method for preventing liquid refrigerant from one-sidedly flow to one of main and sub compressors in a heating mode by comparing a discharge temperature of a compressor driven for above a predetermined time with a discharge temperature predetermined according to a vaporizing temperature according to a third embodiment of the present invention.
  • FIG. 12 is a flowchart illustrating a method for preventing liquid refrigerant from one-sidedly flow to one of main and sub compressors in a heating mode by comparing a discharge temperature of a compressor driven for above a predetermined time with a discharge predetermined discharge temperature according to a fourth embodiment of the present invention
  • FIGS. 3 and 4 shows schematic views of a multi air conditioner according to an embodiment of the present invention.
  • the inventive multi air conditioner comprises main and sub outdoor units 10 and 10 a having compressors 11 and 11 a , 12 and 12 a , respectively and main and sub outdoor heat exchangers 15 and 15 a ; a plurality of outdoor units 20 a , 20 b , and 20 c ; and a pressure regulating tube 30 connected between the main outdoor heat exchanger 15 and the sub outdoor heat exchanger 15 a to uniformly maintain the pressure in cooling and heating modes.
  • frost may be formed on the main outdoor heat exchanger 15 , thereby deteriorating the exchange efficiency and the reliability of the air conditioner.
  • the pressure regulating tube 30 is disposed between the main outdoor heat exchanger 15 and the sub outdoor heat exchanger 15 a to constantly maintain the pressure in the cooling and heating modes.
  • the pressure regulating tube is connected between refrigerant tubes extending from rear ends of the heat exchangers 15 and 15 a when low pressure is formed in the heating mode.
  • the pressure regulating tube is connected between refrigerant tubes extending from front ends of the heat exchangers 15 and 15 a where high pressure is formed in the cooling mode.
  • a diameter of the pressure regulating tube 30 is designed to be less than those of the refrigerant tubes, being greater than ⁇ fraction (3/4) ⁇ inch.
  • FIGS. 5 a and 5 b shows a pressure regulating process between main and sub outdoor heat exchangers through a pressure regulating tube in a cooling mode according to an embodiment of the present invention
  • FIGS. 6 a and 6 b shows a pressure regulating process between main and sub outdoor heat exchangers through a pressure regulating tube in a heating mode according to an embodiment of the present invention.
  • a high-temperature/high-pressure gaseous refrigerant discharged from the inverter and constant compressors 11 and 11 a of the main outdoor unit 10 and a high-temperature/high-pressure gaseous refrigerant discharged from the constant compressor 12 of the sub outdoor unit 10 a are directed to the main and sub outdoor heat exchangers 15 and 15 a through four-way valves 13 and 13 a.
  • the refrigerant flows from a high pressure main side to a low pressure sub side to realize pressure equality. Then, the refrigerant flows to the main and sub outdoor heat exchangers 15 and 15 a . As a result, the heat exchangers 15 and 15 a are operated under an identical refrigerant pressure level.
  • a high-temperature/high-pressure gaseous refrigerant discharged from the inverter and constant compressors 11 and 11 a of the main outdoor unit 10 and a high-temperature/high-pressure gaseous refrigerant discharged from the constant compressor 12 of the sub outdoor unit 10 a are directed to the indoor heat exchangers 23 a , 23 b and 23 c and condensed therein.
  • the condensed refrigerant is then directed to main and sub outdoor heat exchangers 15 and 15 a via the expansion valves 22 a , 22 b and 22 c .
  • the pressure level of the main outdoor heat exchanger 15 is equalized to that of the sub outdoor heat exchanger 15 a . Therefore, the formation of the frost on the main outdoor heat exchanger 15 can be reduced or prevented.
  • the amount of the refrigerant directed to the compressors 11 and 11 a and 12 are equalized to each other, the accumulation amounts of the liquid refrigerant in accumulators 14 and 14 a are equalized to each other, thereby improving the reliability of the air conditioner.
  • the pressure regulating tube 30 of the present invention can be applied to an automatic converting type multi air conditioner as well as a manual converting type multi air conditioner.
  • the air conditioner may more enjoy the pressure regulating effect.
  • a method for controlling the air conditioner with the pressure regulating tube 30 to prevent the liquid refrigerant from one-sidedly flowing to one of the main compressor 11 ( 11 a ) and the sub compressor 12 ( 12 a ) in the heating mode will be described hereinafter.
  • the control of the air conditioner is realized based on 1) a discharge temperature of the compressors 11 , 11 a , 12 and 12 a driven for above a predetermined time, 2) a discharge temperature predetermined according to an outdoor temperature, 3) a discharge temperature predetermined according to a vaporizing temperature.
  • the compressors 11 and 11 a of the main outdoor unit will be represented as the inverter compressor 11 and the compressors 12 and 12 a of the sub outdoor unit will be represented as the constant compressor 12 .
  • FIG. 7 is a flowchart illustrating a method for preventing liquid refrigerant from one-sidedly flow to one of the inverter and constant compressors 11 and 12 in the heating mode by comparing the discharge temperature of a compressor driven for above a predetermined time with the discharge predetermined discharge temperature according to a first embodiment of the present invention.
  • the compressors 11 and 12 are first driven and it is determined if the compressors 11 and 12 are driven for above a predetermined time, for example, for above 10 minutes (S 701 ).
  • the refrigerant introduced from the heat exchanger (the indoor heat exchanger in the cooling mode or the outdoor heat exchanger in the heating mode) into the compressors is in a liquid state.
  • the driving time is set at above 10 minutes.
  • the driving time may be varied.
  • a discharge temperature of the compressors 11 and 12 is measured (S 703 ).
  • the opening of the electronic expansion valve is controlled such that the discharge temperature can greater than a current super heating by 10° C. (S 707 ).
  • SH indicates the super heating
  • Shnew indicates a new super heating
  • Shold indicates a current super heating.
  • the opening of the electronic expansion valve By controlling the opening of the electronic expansion valve, the increase of the oil delivering amount due to the introduction of the liquid refrigerant and the damage of the compressor due to the abrasion of the compression part can be prevented.
  • the opening of the electronic expansion valve is repeatedly controlled until the discharge temperature of the compressor is increased to be higher than the predetermined discharge temperature by 5° C.
  • the predetermined temperature is not limited to 75° C., but may be varied.
  • FIG. 8 shows a graph illustrating a discharge temperature considering the outdoor temperature. That is, the graph shows that the reference discharge temperature may be varied according to the outdoor temperature.
  • FIG. 9 shows a flowchart illustrating a method for preventing liquid refrigerant from one-sidedly flow to one of the inverter and constant compressors 11 and 12 in the heating mode by comparing a discharge temperature of the compressor driven for above a predetermined time with a discharge temperature predetermined according to an outdoor temperature according to a second embodiment of the present invention.
  • the compressors 11 and 12 are first driven and it is determined if the compressors 11 and 12 are driven for above a predetermined time, for example, for more than 10 minutes (S 901 ).
  • the refrigerant introduced from the heat exchanger (the indoor heat exchanger in the cooling mode or the outdoor heat exchanger in the heating mode) into the compressors is in a liquid state.
  • the driving time is set at above 10 minutes.
  • the driving time may be varied.
  • the opening of the electronic expansion valve is controlled such that the discharge temperature can be greater than a current super heating by 10° C. (S 907 ).
  • the opening of the electronic expansion valve By controlling the opening of the electronic expansion valve, the increase of the oil delivering amount due to the introduction of the liquid refrigerant and the damage of the compressor due to the abrasion of the compression part can be prevented.
  • the opening of the electronic expansion valve is repeatedly controlled until the discharge temperature of the compressor is increased to be higher than the predetermined discharge temperature by 5° C.
  • FIG. 10 shows a graph illustrating a discharge temperature considering the vaporizing temperature. That is, the graph shows that the reference discharge temperature may be varied according to the vaporizing temperature.
  • FIG. 11 shows a flowchart illustrating a method for preventing liquid refrigerant from one-sidedly flow to one of the inverter and constant compressors 11 and 12 in the heating mode by comparing a discharge temperature of the compressor driven for above a predetermined time with a discharge temperature predetermined according to a vaporizing temperature according to a third embodiment of the present invention.
  • the compressors 11 and 12 are first driven and it is determined if the compressors 11 and 12 are driven for above a predetermined time, for example, for more than 10 minutes (S 1101 ).
  • the refrigerant introduced from the heat exchanger (the indoor heat exchanger in the cooling mode or the outdoor heat exchanger in the heating mode) into the compressors is in a liquid state.
  • the driving time is set at above 10 minutes.
  • the driving time may be varied.
  • the opening of the electronic expansion valve is controlled such that the discharge temperature can be greater than a current super heating by 10° C. (S 1107 ).
  • the opening of the electronic expansion valve By controlling the opening of the electronic expansion valve, the increase of the oil delivering amount due to the introduction of the liquid refrigerant and the damage of the compressor due to the abrasion of the compression part can be prevented.
  • the opening of the electronic expansion valve is repeatedly controlled until the discharge temperature of the compressor is increased to be higher than the predetermined discharge temperature by 5° C.
  • FIG. 12 shows a flowchart illustrating a method for preventing liquid refrigerant from one-sidedly flow to one of the main and sub compressors 11 and 12 in a heating mode by comparing a discharge temperature of a compressor driven for above a predetermined time with a discharge predetermined discharge temperature according to a fourth embodiment of the present invention.
  • the compressor 11 is first driven and it is determined if the compressor 11 and 12 is driven for above a predetermined time, for example, for more than 20 minutes (S 1201 ).
  • the refrigerant introduced from the heat exchanger (the indoor heat exchanger in the cooling mode or the outdoor heat exchanger in the heating mode) into the compressor is in a liquid state.
  • the driving time is set at above 20 minutes.
  • the driving time may be varied.
  • the measure temperature of the compressor 11 is less than 60° C. and the operating compressor is replaced from the compressor 11 to another compressor 12 , after which the compressor 11 is pre-heated by a heat disposed on a bottom of the compressor 11 to vaporize the liquid refrigerant (S 1207 ).
  • the compressor 11 when the discharge temperature of the compressor 11 is less than 60° C. regardless of the outdoor temperature, since the refrigerant is discharged in the liquid state even the compressing operation of the compressor 11 , the compressor 11 is replaced with the compressor 12 in operation and is pre-heated by the heater to vaporize the liquid refrigerant.
  • the pressure regulating tube is disposed between the main outdoor heat exchanger and the sub outdoor heat exchanger, the formation of the frost on the main outdoor heat exchanger can prevented, thereby improving the reliability of the air conditioner.
  • the pressure regulating tube equalizes the refrigerant pressures directed to the main and sub outdoor heat exchangers, the frost is not formed on the main outdoor heat exchanger, improving the heat exchange efficiency and the reliability of the air conditioner.
  • the one-sided flow of the refrigerant to one of the main and sub compressors can be prevented by control factors such as the discharge temperature of the compressors, the outdoor temperature, and/or the vaporizing temperature, thereby preventing the compressors from being damaged.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
US10/929,456 2003-10-20 2004-08-31 System and method for controlling air conditioner Abandoned US20050081540A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/105,458 US20080209928A1 (en) 2003-10-20 2008-04-18 System and method for controlling air conditioner

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR72992/2003 2003-10-20
KR1020030072992A KR100717444B1 (ko) 2003-10-20 2003-10-20 멀티 에어컨 및 에어컨 제어방법

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/105,458 Division US20080209928A1 (en) 2003-10-20 2008-04-18 System and method for controlling air conditioner

Publications (1)

Publication Number Publication Date
US20050081540A1 true US20050081540A1 (en) 2005-04-21

Family

ID=34386782

Family Applications (2)

Application Number Title Priority Date Filing Date
US10/929,456 Abandoned US20050081540A1 (en) 2003-10-20 2004-08-31 System and method for controlling air conditioner
US12/105,458 Abandoned US20080209928A1 (en) 2003-10-20 2008-04-18 System and method for controlling air conditioner

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/105,458 Abandoned US20080209928A1 (en) 2003-10-20 2008-04-18 System and method for controlling air conditioner

Country Status (5)

Country Link
US (2) US20050081540A1 (de)
EP (1) EP1526346A3 (de)
JP (1) JP2005127702A (de)
KR (1) KR100717444B1 (de)
CN (2) CN100354577C (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060090487A1 (en) * 2004-11-03 2006-05-04 Lg Electronics Inc. Air conditioner
US20060123841A1 (en) * 2004-12-10 2006-06-15 Lg Electronics Inc. Air conditioner
US20060150648A1 (en) * 2004-12-21 2006-07-13 Lg Electronics Inc. Air conditioner
US20060162353A1 (en) * 2004-12-29 2006-07-27 Lg Electronics Inc. Multi-type air conditioner for simultaneous heating and cooling use and method for withdrawing refrigerant therefrom
US20070074538A1 (en) * 2005-09-07 2007-04-05 Denso Corporation Refrigeration cycle device
US7318326B2 (en) 2004-05-24 2008-01-15 Lg Electronics Inc. Multi-air conditioner
US20100071384A1 (en) * 2008-09-25 2010-03-25 B/E Aerospace, Inc. Refrigeration systems and methods for connection with a vehicle's liquid cooling system
US20140245764A1 (en) * 2011-09-30 2014-09-04 Daikin Industries, Ltd. Refrigerant cycle system
US20150300723A1 (en) * 2014-04-16 2015-10-22 Mitsubishi Electric Corporation Air-conditioning apparatus
US20190032968A1 (en) * 2014-01-27 2019-01-31 Qingdao Hisense Hitachi Air-conditioning Systems Co., Ltd. Outdoor Unit of an Air Conditioning System, Air Conditioning System, and Control Method Thereof
CN110234938A (zh) * 2017-02-01 2019-09-13 Lg电子株式会社 空调器的室外系统

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101133619B1 (ko) * 2005-09-13 2012-04-19 엘지전자 주식회사 멀티형 공기조화기 및 그 난방 운전 방법
KR101302128B1 (ko) * 2006-07-19 2013-08-30 엘지전자 주식회사 멀티형 공기조화기 및 그 냉매 불균일 조정 방법
KR101144805B1 (ko) * 2006-12-27 2012-05-11 엘지전자 주식회사 멀티형 공기조화기 및 상기 멀티형 공기조화기의 제어방법
KR101154888B1 (ko) * 2007-07-06 2012-06-13 삼성전자주식회사 공조기기
JP4626714B2 (ja) * 2008-08-22 2011-02-09 ダイキン工業株式会社 冷凍装置
US8943848B2 (en) 2010-06-16 2015-02-03 Reznor Llc Integrated ventilation unit
CN104344456B (zh) * 2013-07-29 2017-03-29 广东美的暖通设备有限公司 多联机空调系统及其室外机冷媒分流不均的调节方法
CN104154672B (zh) * 2014-08-06 2016-08-17 广东美的暖通设备有限公司 并联多联机系统及化霜控制方法
CN107852116B (zh) * 2015-07-14 2020-08-25 株式会社电装 电动压缩机的驱动装置
US11137157B2 (en) 2017-09-18 2021-10-05 Gd Midea Heating & Ventilating Equipment Co., Ltd. Method for controlling multi-split air conditioner, multi-split air conditioner system, and computer-readable storage medium
CN109883011B (zh) * 2018-12-24 2021-02-19 珠海格力电器股份有限公司 冷媒调节方法、装置和空调系统
CN112178802B (zh) * 2020-09-30 2021-10-29 青岛海尔空调器有限总公司 用于确定空调室外机安装位置的方法及装置、空调
CN113531820B (zh) * 2021-06-22 2023-03-17 青岛海尔空调器有限总公司 用于空调器压缩机预热的方法、空调器、空调系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5311748A (en) * 1992-08-12 1994-05-17 Copeland Corporation Control system for heat pump having decoupled sensor arrangement
US5689963A (en) * 1995-05-03 1997-11-25 Copeland Corporation Diagnostics for a heating and cooling system
US6735973B2 (en) * 2002-06-12 2004-05-18 Lg Electronics Inc. Multi-type air conditioner

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0745975B2 (ja) * 1988-03-01 1995-05-17 日本電信電話株式会社 冷凍装置
JP2839343B2 (ja) * 1990-08-10 1998-12-16 株式会社日立製作所 マルチエアコン
JP3143142B2 (ja) * 1991-04-23 2001-03-07 三洋電機株式会社 冷凍装置
TW212224B (de) * 1992-02-28 1993-09-01 Sanyo Denki Kk
JP2966633B2 (ja) * 1992-02-28 1999-10-25 三洋電機株式会社 空気調和装置
JP3060770B2 (ja) * 1993-02-26 2000-07-10 ダイキン工業株式会社 冷凍装置
JP3289366B2 (ja) * 1993-03-08 2002-06-04 ダイキン工業株式会社 冷凍装置
KR950014040B1 (ko) * 1993-05-29 1995-11-20 엘지전자주식회사 냉/난방 공기조화기의 결빙검출 방법
JPH07269974A (ja) * 1994-03-31 1995-10-20 Sanyo Electric Co Ltd 空気調和装置
JP3351099B2 (ja) * 1994-05-26 2002-11-25 ダイキン工業株式会社 冷凍装置
DE69530823T2 (de) * 1994-06-29 2003-12-04 Daikin Industries, Ltd. Ölausgleichsregelung in klimaanlage
JP3829340B2 (ja) * 1995-02-06 2006-10-04 ダイキン工業株式会社 空気調和装置
JPH08327181A (ja) * 1995-05-31 1996-12-13 Sanyo Electric Co Ltd 熱交換器及びその熱交換器を用いた冷凍装置
JP3152614B2 (ja) * 1996-02-23 2001-04-03 三洋電機株式会社 空気調和機
JP2001336840A (ja) * 2000-05-30 2001-12-07 Sanyo Electric Co Ltd 空気調和装置
JP4240355B2 (ja) * 2002-01-28 2009-03-18 コニカミノルタホールディングス株式会社 画像形成装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5311748A (en) * 1992-08-12 1994-05-17 Copeland Corporation Control system for heat pump having decoupled sensor arrangement
US5689963A (en) * 1995-05-03 1997-11-25 Copeland Corporation Diagnostics for a heating and cooling system
US6735973B2 (en) * 2002-06-12 2004-05-18 Lg Electronics Inc. Multi-type air conditioner

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7318326B2 (en) 2004-05-24 2008-01-15 Lg Electronics Inc. Multi-air conditioner
US20060090487A1 (en) * 2004-11-03 2006-05-04 Lg Electronics Inc. Air conditioner
US20060123841A1 (en) * 2004-12-10 2006-06-15 Lg Electronics Inc. Air conditioner
US7555915B2 (en) 2004-12-10 2009-07-07 Lg Electronics Inc. Air conditioner
US20060150648A1 (en) * 2004-12-21 2006-07-13 Lg Electronics Inc. Air conditioner
US7578137B2 (en) * 2004-12-21 2009-08-25 Lg Electronics Inc. Air-conditioning system with multiple indoor and outdoor units and control system therefor
US20060162353A1 (en) * 2004-12-29 2006-07-27 Lg Electronics Inc. Multi-type air conditioner for simultaneous heating and cooling use and method for withdrawing refrigerant therefrom
US20070074538A1 (en) * 2005-09-07 2007-04-05 Denso Corporation Refrigeration cycle device
US20100071384A1 (en) * 2008-09-25 2010-03-25 B/E Aerospace, Inc. Refrigeration systems and methods for connection with a vehicle's liquid cooling system
US9238398B2 (en) * 2008-09-25 2016-01-19 B/E Aerospace, Inc. Refrigeration systems and methods for connection with a vehicle's liquid cooling system
US20140245764A1 (en) * 2011-09-30 2014-09-04 Daikin Industries, Ltd. Refrigerant cycle system
US9638448B2 (en) * 2011-09-30 2017-05-02 Daikin Industries, Ltd. Refrigerant cycle system
US20190032968A1 (en) * 2014-01-27 2019-01-31 Qingdao Hisense Hitachi Air-conditioning Systems Co., Ltd. Outdoor Unit of an Air Conditioning System, Air Conditioning System, and Control Method Thereof
US11035597B2 (en) * 2014-01-27 2021-06-15 Qingdao Hisense Hitachi Air-conditioning Systems Co., Ltd. Outdoor unit of an air conditioning system, air conditioning system, and control method thereof
US20150300723A1 (en) * 2014-04-16 2015-10-22 Mitsubishi Electric Corporation Air-conditioning apparatus
US9829232B2 (en) * 2014-04-16 2017-11-28 Mitsubishi Electric Corporation Air-conditioning apparatus
CN110234938A (zh) * 2017-02-01 2019-09-13 Lg电子株式会社 空调器的室外系统
EP3578898A4 (de) * 2017-02-01 2021-01-06 LG Electronics Inc. Ausseneinheit für klimaanlage
US11300337B2 (en) 2017-02-01 2022-04-12 Lg Electronics Inc. Outdoor system for air conditioner

Also Published As

Publication number Publication date
KR20050037730A (ko) 2005-04-25
KR100717444B1 (ko) 2007-05-14
CN1975276B (zh) 2010-10-13
EP1526346A2 (de) 2005-04-27
CN100354577C (zh) 2007-12-12
JP2005127702A (ja) 2005-05-19
US20080209928A1 (en) 2008-09-04
CN1609526A (zh) 2005-04-27
CN1975276A (zh) 2007-06-06
EP1526346A3 (de) 2011-05-11

Similar Documents

Publication Publication Date Title
US20080209928A1 (en) System and method for controlling air conditioner
US6951116B2 (en) Air conditioner and method for controlling electronic expansion valve of air conditioner
US7587909B2 (en) Multi type air-conditioner and control method thereof
US6779356B2 (en) Apparatus and method for controlling operation of air conditioner
US6843067B2 (en) Air conditioner and method for controlling electronic expansion valve of air conditioner
EP2587193B1 (de) Klimaanlage
JP7186845B2 (ja) 空気調和装置
US7721559B2 (en) Multi-type air conditioner and method for controlling the same
US6807816B2 (en) Air conditioning system with two compressors and method for operating the same
CN111442510B (zh) 多联机空调系统及其控制方法、控制装置和存储介质
WO2005121664A1 (ja) 空気調和装置
US10907866B2 (en) Refrigerant cycle apparatus and air conditioning apparatus including the same
US20120266616A1 (en) Multi-type air conditioner and method of controlling the same
US20100206000A1 (en) Air conditioner and method of controlling the same
JP3352469B2 (ja) 空気調和装置
JP4418936B2 (ja) 空気調和装置
US6843425B2 (en) Air conditioner and method for controlling the same
WO2023092889A1 (zh) 一种多联机空调
KR20060066838A (ko) 멀티형 공기조화기의 실내기 제어 방법
JP2006292214A (ja) 空気調和装置の冷媒量判定機能追加方法、及び、空気調和装置
US20040098994A1 (en) Apparatus and method for controlling compressors of air conditioner
WO2016046927A1 (ja) 冷凍サイクル装置及び空気調和装置
JP5163161B2 (ja) 暖房用補助ユニットおよび空気調和装置
JP5245576B2 (ja) 空気調和装置の冷媒量判定方法および空気調和装置
JP4063041B2 (ja) 多室形空気調和機の制御方法

Legal Events

Date Code Title Description
AS Assignment

Owner name: LG ELECTRONICS INC., KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HWANG, IL NAHM;PARK, YOUNG MIN;LEE, YOON BEEN;AND OTHERS;REEL/FRAME:015753/0097

Effective date: 20040720

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION