EP2299206A1 - Climatiseur et procédé de commande correspondant - Google Patents

Climatiseur et procédé de commande correspondant Download PDF

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Publication number
EP2299206A1
EP2299206A1 EP10251464A EP10251464A EP2299206A1 EP 2299206 A1 EP2299206 A1 EP 2299206A1 EP 10251464 A EP10251464 A EP 10251464A EP 10251464 A EP10251464 A EP 10251464A EP 2299206 A1 EP2299206 A1 EP 2299206A1
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EP
European Patent Office
Prior art keywords
temperature
outdoor
heat exchanger
indoor
heater
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.)
Granted
Application number
EP10251464A
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German (de)
English (en)
Other versions
EP2299206B1 (fr
Inventor
Hwan Jong Choi
Byoung Jin Ryu
Seung Hyun Jung
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
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Filing date
Publication date
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Publication of EP2299206A1 publication Critical patent/EP2299206A1/fr
Application granted granted Critical
Publication of EP2299206B1 publication Critical patent/EP2299206B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/34—Heater, e.g. gas burner, electric air heater
    • 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
    • F25B2313/008—Refrigerant heaters
    • 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
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/11—Sensor to detect if defrost is necessary

Definitions

  • an air conditioner refers to an appliance, for example a home appliance, to maintain the optimum condition of indoor air according to use and purpose. For instance, the air conditioner may cool the air in summer while heating the air in winter. Also, the air conditioner may control the indoor humidity to thereby maintain freshness of the indoor air.
  • the air conditioner may be classified into a split air conditioner in which an indoor unit and an outdoor unit are separated from each other, and an integral air conditioner in which an indoor unit and an outdoor unit are combined as one module.
  • the air conditioner may be classified into a wall mount air conditioner and a picture frame air conditioner to be hung on the wall, and a slim air conditioner to be stood on a floor.
  • the split air conditioner includes an indoor unit that is installed indoors to supply warm air or cold air into a space being air-conditioned, and an outdoor unit that compresses and expands refrigerant to facilitate the heat exchange in the indoor unit.
  • frost is removed by lowering the frequency of an inverter compressor and switching a 4-way valve to temporarily drive a refrigeration cycle.
  • an indoor heat exchanger has to operate as an evaporator for defrosting in a cooling mode, which decreases the indoor temperature.
  • defrost may be retarded since it takes a predetermined time for high-temperature refrigerant to reach the outdoor heat exchanger.
  • Embodiments provide an air conditioner improved in the structure and a control method for efficient defrosting and heating, and a method for controlling the air conditioner.
  • Embodiments also provide an air conditioner capable of sensing quantity of frost formed at a heat exchanger and accordingly varying heat quantity of an induction heater, a method for controlling the same.
  • an air conditioner includes: a compressor that compresses refrigerant an indoor heat exchanger in which heat exchange between the refrigerant passed through the compressor and indoor air is performed, an expansion device that decompresses the refrigerant passed through the indoor heat exchanger, an outdoor heat exchanger in which heat exchange between the refrigerant supplied from the expansion device and outdoor air is performed, a plurality of sensors that sense temperature of the outdoor heat exchanger, indoor temperature, and outdoor temperature, respectively, a heater that generates heat variably according to the outdoor temperature and the outdoor heat exchanger temperature detected by the sensors, and a controller that determines quantity of frost formed on the outdoor heat exchanger by comparing a preset reference temperature (or reference value) with a temperature difference between the outdoor temperature and the outdoor heat exchanger temperature, and controls output of the heater according to the determined frost quantity.
  • a method for controlling an air conditioner comprising a compressor, an indoor heat exchanger, an expansion device and an outdoor heat exchanger for a refrigeration cycle, includes: comparing indoor temperature with a first preset temperature, comparing outdoor temperature with a second preset temperature according to a result of the comparison between the indoor temperature and the first preset temperature, determining a temperature difference between the outdoor temperature and temperature of an outdoor heat exchanger, comparing the temperature difference with a preset reference temperature (or reference value) and controlling heat quantity of a heater that defrosts the outdoor heat exchanger, according to a result of the comparison between the temperature difference and the reference temperature.
  • a control method for an air conditioner comprising a compressor, a condenser, an expansion device and an evaporator that are used for driving a refrigeration cycle, and a heater to defrost the evaporator, includes: comparing indoor and outdoor temperatures with preset temperatures, detecting a pipe temperature of an outdoor heat exchanger, obtaining a temperature difference between the outdoor temperature and temperature of the outdoor heat exchanger, determining frost quantity on the evaporator by the temperature difference, and controlling heat quantity of the heater in proportion to the frost quantity.
  • Fig. 1 is a view showing the structure of a heating cycle of an air conditioner 1 according to an embodiment.
  • the air conditioner 1 of the current embodiment includes a compressor 10 that compresses refrigerant, an indoor heat exchanger 21 in which high-temperature high-pressure refrigerant compressed in the compressor 10 is supplied for heat exchange with indoor air, an indoor heat exchanger fan 22 supplying the air heated through the heat exchange into an indoor space, an expansion device (for example, a capillary tube 30) that expands the refrigerant to a low pressure after the heat exchange, an outdoor heat exchanger 41 in which heat exchange between the expanded refrigerant and outdoor air is performed, and an outdoor heat exchanger fan 42 supplying the air cooled through the heat exchange to the outside.
  • a compressor 10 that compresses refrigerant
  • an indoor heat exchanger 21 in which high-temperature high-pressure refrigerant compressed in the compressor 10 is supplied for heat exchange with indoor air
  • an indoor heat exchanger fan 22 supplying the air heated through the heat exchange into an indoor space
  • an expansion device for example, a capillary tube 30
  • an outdoor heat exchanger 41 in which heat exchange between the expanded
  • the 'defrosting with continuous heating' operation is herein defined as the operation in which a defrosting operation for the outdoor heat exchanger 41 is performed simultaneously with a heating operation of the air conditioner.
  • the defrosting operation for the outdoor heat exchanger 41 may be performed as high-temperature high-pressure refrigerant passed through the compressor 10 is bypassed toward an inlet of the outdoor heat exchanger 41.
  • the air conditioner 1 further includes a bypass path 81 that bypasses hot gas of the refrigerant passed through the compressor 10 toward at least one of the inlet of the outdoor heat exchanger 41 and an inlet of the gas liquid separator 50. More specifically, the bypass path 81 may extend from an outlet of the compressor 10 to the inlet of the outdoor heat exchanger 41 and to the inlet of the compressor 10.
  • the evaporating temperature and pressure of the refrigerant at the inlet of the compressor 10 may be increased, thereby reducing a work input (load) of the compressor 10.
  • imbalance of capacities between the compressor 10 and the indoor heat exchanger 21 may be reduced, accordingly improving the heating efficiency.
  • the defrosting with continuous heating operation is carried out as the refrigerant is bypassed by the first valve 80.
  • a second valve 90 is disposed on the bypass path 81 to prevent the refrigerant from flowing from the inlet of the outdoor heat exchanger 41 to the inlet of the gas liquid separator 50.
  • the second valve 90 may prevent backflow of the refrigerant from the inlet of the outdoor heat exchanger 41 to the inlet of the gas liquid separator 50 through the bypass path 81.
  • the second valve 90 may include a check valve.
  • a 4-way valve 70 is disposed near the outlet of the compressor 10 in order to change a flow direction of the refrigerant according to whether the air conditioner is in a heating mode or a cooling mode.
  • the refrigerant passed through the outdoor heat exchanger 41 is guided into the compressor 10 through the 4-way valve 70 and then compressed.
  • the compressed refrigerant is passed through the 4-way valve 70 and guided into the indoor heat exchanger 21.
  • the refrigerant passed through the indoor heat exchanger 21 is guided into the compressor 10 through the 4-way valve 70 and then compressed.
  • the compressed refrigerant may be guided into the outdoor heat exchanger 41 through the outdoor heat exchanger 41.
  • a heater such as an induction heater 60, is provided at the outside of the gas liquid separator 50 to heat the refrigerant in the gas liquid separator 50.
  • the induction heater 60 may be configured to enclose an outer circumference of the gas liquid separator 50.
  • the induction heater 60 is a heater that uses an induced current generated by a magnetic field as a heat source.
  • the induction heater 60 includes an electromagnet that conducts a high-frequency alternating current.
  • the electromagnet includes coils conducting alternating currents.
  • the induction heater 60 supplies heat to the low-pressure side refrigerant, that is, the refrigerant at the outdoor heat exchanger 41 during the defrosting with continuous heating operation, consequently increasing the evaporating temperature of the refrigerant.
  • defrost for the outdoor heat exchanger 41 may be promoted.
  • the induction heater 60 heats the refrigerant at the inlet of the compressor 10. Therefore, the induction heater 60 supplies heat to the high-pressure side refrigerant, that is, the refrigerant at the indoor heat exchanger 21, and thereby increases a condensing temperature. Thus, the evaporating temperature and the condensing temperature of the refrigerant are increased, and therefore the heating efficiency and the defrosting efficiency may both be improved.
  • the induction heater 60 supplies heat to the indoor heat exchanger 21 in the general heating mode, thereby increasing a pipe temperature of the indoor heat exchanger 21. As a result, the air to be blown into the indoor space may be rapidly heated.
  • An inverter system may be applied to the induction heater 60 to control the heat quantity of the induction heater 60.
  • the supplied heat quantity is adjustable according to the outdoor temperature and the temperature of a heat exchanger requiring defrosting.
  • a method of controlling the heat quantity of the induction heater 60 according to frost quantity on the outdoor heat exchanger 41 will be described hereinafter with reference to the accompanying drawings.
  • Fig. 2 is a block diagram showing the structure of the air conditioner according to the embodiment.
  • the air conditioner 1 includes an outdoor temperature sensor 110 detecting the outdoor temperature, an indoor temperature sensor 120 detecting temperature of an indoor space, and an outdoor heat exchanger sensor 130 detecting a refrigerant pipe temperature of the outdoor heat exchanger 41.
  • the air conditioner 1 further includes a controller 100 that receives signals from the sensors 110, 120 and 130 and controls the induction heater 60 which generates heat by variable degrees according to values detected by the sensors 110, 120 and 130.
  • values detected by the sensors 110, 120 and 130 are transmitted to the controller 100.
  • the controller 100 may analyze data transmitted from the sensors 110, 120 and 130 and control the induction heater 60 to generate a preset quantity of heat.
  • Fig. 3 and Fig. 4 are flowcharts illustrating a method of controlling the air conditioner in a first indoor temperature range.
  • Fig. 5 is a flowchart illustrating a method of controlling the air conditioner in a second indoor temperature range.
  • T1 may be preset to about 15°C, but is not limited thereto. That is, T1 may be varied according to the control method of the air conditioner.
  • T2 may be set to about 0°C, but not limited thereto. That is, T2 may be varied according to the control method of the air conditioner.
  • the quantity of frost (or a parameter indicative of the amount of frost) formed on the outdoor heat exchanger 41 is determined when the outdoor temperature is not less than T2 (S15).
  • the frost quantity on the outdoor heat exchanger 41 may be determined based on whether the "GAP" (outdoor temperature-outdoor heat exchanger pipe temperature) is greater than a preset temperature difference H1. As the GAP becomes greater, condensed air quantity at the pipe of the outdoor heat exchanger 41 may increase. Consequently, frost is more likely to form on the pipe.
  • GAP outdoor temperature-outdoor heat exchanger pipe temperature
  • temperature of the refrigerant pipe of the outdoor heat exchanger 41 is detected by the outdoor heat exchanger sensor 130.
  • the controller 100 determines the GAP, that is, a difference between the outdoor temperature and the refrigerant pipe temperature. The difference is compared to H1.
  • H1 may be preset to about 8°C, but not limited thereto. That is, H1 may be varied according to the control method of the air conditioner (S16).
  • the controller 100 determines that the frost quantity on the outdoor heat exchanger 41 is large. According to this, the controller 100 controls the output of the induction heater 60 to a first output P1 so that the heat quantity of the induction heater 60 is increased.
  • P1 may be preset to about 1200W (S20).
  • the controller 100 determines that the frost quantity on the outdoor heat exchanger 41 is medium and, accordingly, controls the output of the induction heater 60 to a second output P2.
  • H2 may be preset to 4°C different from H1.
  • P2 may be preset to 900W less than P1.
  • H2 and P2 values may be varied according to the control method of the air conditioner (S17 and S19).
  • the controller 100 determines that the frost quantity on the outdoor heat exchanger 41 is small. According to this, the controller 100 may control the output of the induction heater 60 to a third output P3 so that the heat quantity of the induction heater 60 is reduced.
  • P3 may be preset to about 600W. However, P3 may be set to any other value as long as less than P2, according to the control method of the air conditioner (S18).
  • T3 may be set to about -5°C, but not limited to this, may be varied according to the control method.
  • the frost quantity on the outdoor heat exchanger 41 is determined (S22).
  • the frost quantity may be determined by whether the GAP is greater than a preset temperature difference H3.
  • the refrigerant pipe temperature of the outdoor heat exchanger 41 is detected by the outdoor heat exchanger sensor 130.
  • the controller 100 determines the GAP through the outdoor temperature and the refrigerant pipe temperature of the outdoor heat exchanger 41.
  • the GAP is compared to the H3 (S23).
  • the controller 100 may determine that the frost quantity on the outdoor heat exchanger 41 is large and accordingly control the output of the induction heater 60 to the first output P1 so that the heat quantity of the induction heater 60 is increased (S20).
  • the controller 100 may determine the frost quantity on the outdoor heat exchanger 41 is medium and accordingly control the output of the induction heater 60 to the second output P2 (S19).
  • H4 may be preset to about 3°C, but not limited thereto. That is, H4 may be varied according to the control method of the air conditioner.
  • the controller 100 may determine that the frost quantity on the outdoor heat exchanger 41 is small and, accordingly, control the output of the induction heater 60 to the third output P3 so that the heat quantity of the induction heater 60 is reduced (S18).
  • the frost quantity may be determined when the outdoor temperature is not greater than T3 in operation S21 (S25).
  • the frost quantity may be determined based on whether the GAP is greater than a preset temperature difference H5.
  • H5 may be preset to about 7°C, but not limited thereto. That is, H5 may be varied according to the control method of the air conditioner.
  • the controller 100 determines that the frost quantity on the outdoor heat exchanger 41 is large and accordingly control the output of the induction heater 60 to the first output P1 so that the heat quantity of the induction heater 60 is increased (S20).
  • the controller 100 may determine the frost quantity on the outdoor heat exchanger 41 is medium and accordingly control the output of the induction heater 60 to the second output P2 (S19).
EP10251464.3A 2009-09-11 2010-08-19 Climatiseur et procédé de commande correspondant Not-in-force EP2299206B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090086152A KR101605901B1 (ko) 2009-09-11 2009-09-11 공기 조화기 및 그 제어방법

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EP2299206A1 true EP2299206A1 (fr) 2011-03-23
EP2299206B1 EP2299206B1 (fr) 2019-02-06

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EP (1) EP2299206B1 (fr)
KR (1) KR101605901B1 (fr)
CN (1) CN102022807B (fr)
WO (1) WO2011031014A2 (fr)

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CN105258408A (zh) * 2015-10-08 2016-01-20 Tcl空调器(中山)有限公司 空调器及空调器除霜方法
CN111043724A (zh) * 2019-12-30 2020-04-21 青岛海尔空调器有限总公司 空调器的控制方法
EP3885662A4 (fr) * 2018-12-27 2022-01-26 Hefei Midea Heating & Ventilating Equipment Co., Ltd. Climatiseur, et procédé et dispositif de commande de système de chauffage associé
CN114043839A (zh) * 2021-11-03 2022-02-15 金龙联合汽车工业（苏州）有限公司 一种新能源电动空调、自动控制方法及车辆

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CN103363709B (zh) * 2012-04-09 2015-12-02 珠海格力电器股份有限公司 热泵式空气调节装置
DE102012109198B4 (de) * 2012-09-27 2020-03-26 ait-deutschland GmbH Verfahren zur Steuerung des Abtauens eines Kältemittelverdampfers
JP6185251B2 (ja) * 2013-02-12 2017-08-23 シャープ株式会社 空気調和機
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JP6120786B2 (ja) * 2014-02-13 2017-04-26 三菱電機株式会社 空気調和機及び制御プログラム
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CN106288483B (zh) * 2016-08-03 2019-02-26 美的集团武汉制冷设备有限公司 一种空调器和提高空调器制热效果的方法
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CN111536674A (zh) * 2020-05-13 2020-08-14 广东美的制冷设备有限公司 空调器的高温杀菌控制方法、空调器及计算机存储介质
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CN111043724A (zh) * 2019-12-30 2020-04-21 青岛海尔空调器有限总公司 空调器的控制方法
CN114043839A (zh) * 2021-11-03 2022-02-15 金龙联合汽车工业（苏州）有限公司 一种新能源电动空调、自动控制方法及车辆
CN114043839B (zh) * 2021-11-03 2024-03-15 金龙联合汽车工业（苏州）有限公司 一种新能源电动空调、自动控制方法及车辆

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KR20110028180A (ko) 2011-03-17
WO2011031014A3 (fr) 2011-07-07
CN102022807A (zh) 2011-04-20
KR101605901B1 (ko) 2016-03-23
WO2011031014A2 (fr) 2011-03-17
CN102022807B (zh) 2013-10-09

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