EP1677058A2 - Méthode de régulation de surcharge de refroidissement d'un système de conditionnement d'air - Google Patents

Méthode de régulation de surcharge de refroidissement d'un système de conditionnement d'air Download PDF

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Publication number
EP1677058A2
EP1677058A2 EP05028036A EP05028036A EP1677058A2 EP 1677058 A2 EP1677058 A2 EP 1677058A2 EP 05028036 A EP05028036 A EP 05028036A EP 05028036 A EP05028036 A EP 05028036A EP 1677058 A2 EP1677058 A2 EP 1677058A2
Authority
EP
European Patent Office
Prior art keywords
capacity
compressors
over
load
outdoor
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.)
Withdrawn
Application number
EP05028036A
Other languages
German (de)
English (en)
Other versions
EP1677058A3 (fr
Inventor
Won Hee Lee
Seung Youp Hyun
Jae Hoon Sim
Yoon Jei Hwang
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
Publication of EP1677058A2 publication Critical patent/EP1677058A2/fr
Publication of EP1677058A3 publication Critical patent/EP1677058A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—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
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/005—Arrangement or mounting of control or safety devices of safety devices
    • 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
    • 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
    • F25B2400/0751—Details of compressors or related parts with parallel compressors the compressors having different capacities
    • 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
    • F25B2500/08—Exceeding a certain temperature value in a refrigeration component or 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
    • F25B2500/00—Problems to be solved
    • F25B2500/29—High ambient temperatures
    • 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
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • 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
    • F25B2700/2116—Temperatures of a condenser

Definitions

  • the present invention relates to a method of controlling an operation of an air conditioner, and, more particularly, to a method of controlling an over-load cooling operation of an air conditioner that is capable of enabling the cooling operation of the air conditioner to be performed without interruption, while protecting the air conditioner system, when over load is generated during the cooling operation of the air conditioner.
  • a heat-pump type air conditioner is a kind of air conditioner that is capable of performing a simultaneous cooling and heating operation.
  • the heat-pump type air conditioner includes an evaporator and a compressor, by which the heat-pump type air conditioner is used as a cooling apparatus or a heating apparatus. Switching between the cooling apparatus and the heating apparatus is accomplished by reversing flow of coolant in a cooling cycle.
  • FIG. 1 is a perspective view schematically showing a conventional unitary air conditioner, which is one form of the above-mentioned heat-pump type air conditioner.
  • the unitary air conditioner is constructed such that an operation or stop signal is transmitted to an indoor unit 20 and an outdoor unit 10 from a thermostat 20, which is mounted in a room, to operate the indoor unit 20 and the outdoor unit 10.
  • unitary air conditioners each having a 1-stage thermostat which transmits only an ON/OFF signal
  • unitary air conditioners each having a 2-stage thermostat by which change in capacity is possible, have been used.
  • a 2-stage variable compressor whose capacity is variable, or a plurality of constant-speed compressors are used. Based on a signal from the thermostat, the cooling or heating operation is performed while the capacity of the compressor is changed.
  • the outdoor temperature increases under the over-load operation condition.
  • users rather requires higher cooling operation of the air conditioner.
  • the air conditioner is stopped to protect the air conditioner system at this time, the indoor temperature increases, and therefore, the users feel discomfort.
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of controlling an over-load cooling operation of an air conditioner that is capable of enabling the cooling operation of the air conditioner to be performed without interruption, while protecting the air conditioner system, when over load is generated during the cooling operation of the air conditioner, thereby improving user comfort and improving operational reliability of the air conditioner.
  • a method of controlling an over-load cooling operation of an air conditioner including: an over-load operation mode in which, when an outdoor pipe temperature and an outdoor temperature exceeds reference temperatures, respectively, the operation capacity is changed to a low-level operation capacity, which is lower than the current operation capacity, the low-level operation capacity being one of plural operation capacities set according to the operation capacities of compressors, and the operation is performed; and a normal operation mode in which the outdoor pipe temperature is measured every predetermined period of time after the operation is performed in the over-load operation mode, and, when the measured outdoor pipe temperature is below the reference temperature, the operation is performed according to a signal from a thermostat.
  • the reference temperature of the outdoor pipe temperature is set to be higher than the reference temperature of the outdoor temperature.
  • the operation capacity is changed to a first low-level operation capacity, which is lower than the current operation capacity, and, if the outdoor pipe temperature or the outdoor temperature exceeds the reference temperatures when a predetermined period of time elapses after the operation is performed in the over-load operation mode, the operation capacity is changed to a second low-level operation capacity, which is lower than the first low-level operation capacity, and then the operation is performed in the second low-level operation capacity.
  • the compressors are operated with the Y% operation capacity, which is lower than the X% operation capacity, when the operation capacity is the Y% operation capacity, the compressors are operated with the Z% operation capacity, which is lower than the Y% operation capacity, and when the operation capacity is the Z% operation capacity, the compressors are stopped.
  • an outdoor fan by which an outdoor heat exchanger is cooled, is operated with high airflow, and, when the compressors are stopped in the over-load operation mode, the outdoor fan is stopped.
  • the compressors are returned to the normal operation mode.
  • the operation is still performed in the over-load operation mode.
  • the operation mode is not changed to the over-load operation mode for a predetermined period of time.
  • the outdoor pipe temperature is a specific temperature, which is higher than the reference temperature, when a predetermined period of time elapses after the compressors are started, both the compressors are stopped.
  • the method of controlling the over-load cooling operation of the air conditioner is capable of performing the controlling operation such that the continuous cooling operation is possible even under the over-load condition during the cooling operation of the air conditioner, and the air conditioner system is protected through the variable-capacity operation. Consequently, the present invention has the effect of improving user comfort and improving operational reliability of the air conditioner.
  • FIG. 2 is a view showing the structure of an air conditioner system, to which a method of controlling an over-load cooling operation of an air conditioner according to the present invention is applied.
  • FIG. 2 shows the operational state of the air conditioner during the cooling operation.
  • a small-capacity compressor 51 and a large-capacity compressor 52 are mounted in an outdoor unit 50.
  • an accumulator 57 At the inlet sides of the compressors 51 and 52 is mounted an accumulator 57.
  • check valves 59 At the outlet sides of the compressors 51 and 52 are mounted check valves 59, respectively, for preventing backward-flow of refrigerant.
  • Between the inlet and outlet sides of the compressors 51 and 52 are mounted flat pressure valves 58, respectively, for performing a flat pressure function when the compressors are stopped.
  • outdoor unit 50 In the outdoor unit 50 is also mounted a four-way valve 53 for performing a switching operation between cooling and heating operations. Furthermore, an outdoor heat exchanger 55, which serves as an evaporator when the heating operation is performed, and an outdoor fan 56 for blowing air are mounted in the outdoor unit 50.
  • a pipe temperature sensor 54 for measuring the temperature of a pipe and an outdoor temperature sensor 80 for measuring the temperature of outdoor air are mounted in the outdoor unit 50.
  • the pipe temperature sensor 54 is mounted at the outdoor heat exchanger 55, although the pipe temperature sensor 54 may be mounted at the pipe between the outlet sides of the compressors 51 and 52 and the outdoor heat exchanger 55.
  • an indoor unit 60 In an indoor unit 60 is mounted an indoor heat exchanger 61, which is connected to the four-way valve 53 and the outdoor heat exchanger 55 via a refrigerant line.
  • the indoor heat exchanger 61 serves as a condenser during the heating operation of the air conditioner.
  • an indoor fan 62 In the indoor unit 60 is also mounted an indoor fan 62 for blowing air.
  • an expansion device 63 At the refrigerant line between the indoor heat exchanger 61 and the outdoor heat exchanger 55 is mounted an expansion device 63.
  • a 2-stage thermostat 70 for manipulating the operation of the heat-pump type air conditioner with the above-stated construction.
  • the 2-stage thermostat 70 is configured to generate an off signal, a low operation signal Y1, and a high operation signal Y2.
  • the 2-stage thermostat 70 is configured such that the variable operation of the air conditioner is possible. Based on indoor-side load, the 2-stage thermostat 70 transmits the high operation signal Y2 or the low operation signal Y1 to the indoor fan 62 of the indoor unit 60 and the compressors 51 and 52 of the outdoor unit 50.
  • At least one of the compressors 51 and 52 which have different capacities, is operated. According to the operation of the compressors 51 and 52, the refrigerant is circulated via the four-way valve 53, the outdoor heat exchanger 55, the expansion device 63, the indoor heat exchanger 61, the four-way valve 53, the accumulator 57, and the compressors 51 and 52. Consequently, the cooling operation is performed.
  • the operations of the large-capacity compressor 52 and the small-capacity compressor 51 of the air conditioner according to the present invention are operated in 3 stage modes, for example, in 100% operation mode, 60% operation mode, and 40% operation mode according to the signal from the 2-stage thermostat 70.
  • the high operation signal Y2 is transmitted to the compressors 51 and 52 from the thermostat 70
  • the 100 % operation is performed, i.e., both the large-capacity compressor 52 and the small-capacity compressor 51 are operated.
  • the low operation signal Y1 is transmitted to the compressors 51 and 52 from the thermostat 70, on the other hand, the large-capacity compressor 52 or the small-capacity compressor 51 is operated according to the operating condition.
  • FIG. 3 is a flow chart illustrating the method of controlling the over-load cooling operation of the air conditioner according to the present invention
  • FIG. 4 is a graph illustrating the method of controlling the over-load cooling operation of the air conditioner according to the present invention.
  • the compressors 51 and 52 are started according to the cooling operation of the air conditioner. If the outdoor pipe temperature measured by the pipe temperature sensor 54 is a specific temperature (for example, 65 °C), which is higher than a reference temperature (for example, 60 °C), when a predetermined period of time elapses, for example, when 30 seconds elapses, after the compressors are started or when 10 minutes elapses after the air conditioner is operated in the over-load operation mode, it is determined that the air conditioner is under the pipe over-load condition. As a result, the compressors 51 and 52 and the outdoor fan 56 are all stopped.
  • a specific temperature for example, 65 °C
  • a reference temperature for example, 60 °C
  • the compressors are operated in the over-load operation mode, in which the operation capacity is changed to a first low-level operation capacity, which is lower than the current operation capacity.
  • the first low-level operation capacity is one of plural operation capacities set according to the operation capacities of the compressors 51 and 52.
  • an X% operation capacity (100% operation capacity), in which both the compressors 51 and 52 are operated, a Y% operation capacity (60% operation capacity), in which only the large-capacity compressor 52 is operated, and a Z% operation capacity (40% operation capacity), in which only the small-capacity compressor 51 is operated, are set in order of operation capacities of the compressors in the over-load operation mode
  • the compressors when the operation capacity is the 100% operation capacity, the compressors are operated with the 60% operation capacity, which is lower than the 100% operation capacity.
  • the operation capacity is the 60% operation capacity
  • the compressors are operated with the 40% operation capacity, which is lower than the 60% operation capacity.
  • the operation capacity is the 40% operation capacity, the compressors are stopped.
  • the outdoor fan 56 When the compressors 51 and 52 are operated with the 60% operation capacity and the 40% operation capacity, respectively, the outdoor fan 56, by which the outdoor heat exchanger 55 is cooled, is operated in high airflow mode if the outdoor fan 56 can be operated in high/middle/low airflow mode. When the compressors 51 and 52 are stopped, the outdoor fan 56 is also stopped.
  • the operation capacity is changed to a second low-level operation capacity, which is lower than the first low-level operation capacity, and then the operation is performed in the second low-level operation capacity.
  • the compressors are operated with the changed 60% operation capacity in the first section, for example, in the A section, after entry into the over-load operation mode, as illustrated in FIG. 4, and the outdoor pipe temperature exceeds 60 °C even after 10 minutes elapses, the compressors are operated with the 40% operation capacity.
  • the control signal is changed from the 100% operation capacity to the 60% operation capacity. Consequently, the over-load operation mode is automatically released, and the compressors are returned to the normal operation mode.
  • the signal is changed from the low operation signal Y1 to the OFF signal, both the compressors 51 and 52 are stopped.
  • the operation is still performed in the over-load operation mode.
  • the outdoor pipe temperature or the outdoor temperature is measured every 10 minutes after the operation is performed in the over-load operation mode.
  • the operation is performed in the normal operation mode, in which the operation is performed according to the signal from the thermostat 70.
  • the operation mode is not changed to the over-load operation mode for a predetermined period of time, by which abrupt change in capacities of the compressors is prevented, and therefore, the air conditioner system is protected.
  • the method of controlling the over-load cooling operation of the air conditioner is capable of performing the controlling operation such that the continuous cooling operation is possible even under the over-load condition during the cooling operation of the air conditioner, and the air conditioner system is protected through the variable-capacity operation. Consequently, the present invention has the effect of improving user comfort and improving operational reliability of the air conditioner.

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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)
EP05028036A 2004-12-28 2005-12-21 Méthode de régulation de surcharge de refroidissement d'un système de conditionnement d'air Withdrawn EP1677058A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020040113566A KR100688169B1 (ko) 2004-12-28 2004-12-28 에어컨의 냉방 과부하 운전 제어 방법

Publications (2)

Publication Number Publication Date
EP1677058A2 true EP1677058A2 (fr) 2006-07-05
EP1677058A3 EP1677058A3 (fr) 2012-01-11

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EP05028036A Withdrawn EP1677058A3 (fr) 2004-12-28 2005-12-21 Méthode de régulation de surcharge de refroidissement d'un système de conditionnement d'air

Country Status (4)

Country Link
US (1) US20060207273A1 (fr)
EP (1) EP1677058A3 (fr)
KR (1) KR100688169B1 (fr)
CN (1) CN1796887A (fr)

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KR100705223B1 (ko) * 2005-10-28 2007-04-06 엘지전자 주식회사 공기조화기의 부분 과부하 해소방법
KR20080074378A (ko) * 2007-02-08 2008-08-13 엘지전자 주식회사 멀티에어컨의 온도제한 방법
KR101569414B1 (ko) * 2008-12-26 2015-11-16 엘지전자 주식회사 공기조화기 및 그 동작방법
KR101350774B1 (ko) * 2011-02-23 2014-01-14 위니아만도 주식회사 압축기의 운전 제어 방법
CN104566772A (zh) * 2013-10-24 2015-04-29 广州南洋理工职业学院 空调制冷过载保护方法
US9759466B2 (en) * 2014-03-05 2017-09-12 Lennox Industries Inc. Heat pump system having a maximum percent demand re-calculation algorithm controller
CN110779188A (zh) * 2019-11-05 2020-02-11 中国扬子集团滁州扬子空调器有限公司 提高空调制冷高负荷运行性能的控制方法

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JPS6191450A (ja) * 1984-10-12 1986-05-09 Matsushita Electric Ind Co Ltd 空気調和機の過負荷制御装置
JPS63297783A (ja) * 1987-05-29 1988-12-05 Daikin Ind Ltd 冷凍装置の過負荷制御装置
US5231846A (en) * 1993-01-26 1993-08-03 American Standard Inc. Method of compressor staging for multi-compressor multi-circuited refrigeration systems
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US20060207273A1 (en) 2006-09-21
CN1796887A (zh) 2006-07-05
KR20060075020A (ko) 2006-07-04
KR100688169B1 (ko) 2007-03-02
EP1677058A3 (fr) 2012-01-11

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