EP1956306A2 - Mehrsystem-Klimaanlage und Steuerverfahren dafür - Google Patents

Mehrsystem-Klimaanlage und Steuerverfahren dafür Download PDF

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Publication number
EP1956306A2
EP1956306A2 EP07120691A EP07120691A EP1956306A2 EP 1956306 A2 EP1956306 A2 EP 1956306A2 EP 07120691 A EP07120691 A EP 07120691A EP 07120691 A EP07120691 A EP 07120691A EP 1956306 A2 EP1956306 A2 EP 1956306A2
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EP
European Patent Office
Prior art keywords
air
indoor units
capacity
operating
combination ratio
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
EP07120691A
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English (en)
French (fr)
Other versions
EP1956306B1 (de
EP1956306A3 (de
Inventor
Kwang Il No. 512-1105 Sinnamusil-5th Apt. Nam
Byoung Guk No. 504-1002 Jugong-greenvill Apt. 1282 Lim
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Filing date
Publication date
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Publication of EP1956306A2 publication Critical patent/EP1956306A2/de
Publication of EP1956306A3 publication Critical patent/EP1956306A3/de
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Publication of EP1956306B1 publication Critical patent/EP1956306B1/de
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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
    • 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
    • F24F3/065—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 with a plurality of evaporators or condensers
    • 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
    • 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
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/024—Compressor control by controlling the electric parameters, e.g. current or voltage
    • 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
    • F25B2700/2104—Temperatures of an indoor room or compartment

Definitions

  • the present invention relates to a multi-system air-conditioner for connecting a plurality of indoor units to a single outdoor unit, and more particularly to a multi-system air-conditioner for actively controlling a frequency of a compressor so that the indoor units can discharge the air of a predetermined temperature although the air volume is changed to another, and a method for controlling the same.
  • an air-conditioner has been widely used to reduce or increase a room temperature, and uses a general cooling cycle for circulating a refrigerant between the indoor and outdoor units. Therefore, the air-conditioner absorbs heat of a room when a liquid refrigerant is evaporated, and emits the heat when the refrigerant is liquefied, so that the cooling or heating operation can be carried out.
  • a general air-conditioner includes a single outdoor unit and a single indoor unit connected to the single outdoor unit. Recently, the number of users who desire to use a multi-system air-conditioner is rapidly increasing.
  • the multi-system air-conditioner connects a plurality of indoor units to a single outdoor unit, so that the indoor units perform the cooling or heating operation independent of each other.
  • the multi-system air-conditioner Since the multi-system air-conditioner connects the indoor units to only one outdoor unit, the operation capacity of the indoor units may be higher or less than that of the outdoor unit. Considering this situation, the multi-system air-conditioner uses an inverter compressor. Each indoor unit compares a room temperature with a reference temperature (or a preset temperature), and calculates a proper cooling/heating capacity using the required capacity of the corresponding indoor unit to decide a combination ratio of indoor-unit capacity (i.e., the agreement ratio of outdoor-unit capacity to indoor-unit capacity) as shown in FIG. 1 , so that it changes a frequency within a predetermined range.
  • a combination ratio of indoor-unit capacity i.e., the agreement ratio of outdoor-unit capacity to indoor-unit capacity
  • the indoor-unit combination ratio (%) is equal to or less than a maximum operation capacity of 130%, a frequency of the compressor is changed between a minimum cooling capacity and a maximum cooling capacity. If the indoor-unit combination ratio (%) is higher than the maximum operation capacity of 130%, the frequency of the compressor is fixed to a maximum frequency.
  • a frequency-rising limitation value of the compressor frequency shown in FIG. 1 is fixed to a maximum frequency in most cases excepting some cases (e.g., a case for protecting a system, and a frequency-rising limitation case for maintaining/decreasing a frequency according to operation modes), so that the compressor frequency is fixed to the maximum frequency and the compressor is operated at the maximum frequency.
  • the conventional air-conditioner aims to drop only the room temperature, but the recently-developed air-conditioner considers a noise of the indoor units to be the important factor for allowing a user to select a corresponding product.
  • the RPM of a fan motor of the indoor unit is decreased.
  • the conventional multi-system air-conditioner has the same frequency limitation value at the strong and weak air-volume modes, irrespective of the air volume of the indoor unit. Therefore, the temperature of the air discharged from the indoor unit at the strong air-volume mode is lower than that of the weak air-volume mode as shown in FIG. 1 , so that the user may feel the cold. And, if the temperature of the air discharged from the indoor unit is excessively decreased, the condensed water may be scattered all around.
  • a duct- or roof- airconditioner provides the user with the most comfortable room-temperature of about 16°C
  • a wall- or stand- air-conditioner provides the user with the most comfortable room-temperature of about 14°C.
  • the above-mentioned conventional multi-system air-conditioner controls the compressor frequency irrespective of the air volume of the indoor units, so that the temperature of the air discharged from the indoor units drops to about 11°C ⁇ 12°C at which the user may feel the cold.
  • a method for operating a multi-system air-conditioner which includes an outdoor unit, a plurality of indoor units connected to the outdoor unit, and a compressor for varying its own frequency according to operation capacity of the indoor units, the method comprising: comparing, by each of the indoor units, a setup temperature with a room temperature, and calculating a capacity required for each indoor unit; calculating the sum of all the required capacities of the indoor units to calculate a combination ratio of all the operating indoor units; and comparing the calculated combination ratio with a reference combination ratio to determine whether the combination ratio of the indoor units is equal to or less than the reference combination ratio, limiting a frequency-rising width of the compressor to a predetermined value according to air-volumes of the operating indoor units when the calculated combination ratio is equal to or less than the reference combination ratio, and operating the air-conditioner at the limited value.
  • the combination ratio of the indoor units is equal to the sum of required capacities of the indoor units compared with a capacity of the outdoor unit.
  • the limiting of the frequency-rising width of the compressor includes: checking the air-volumes of all the operating indoor units, determining an air-volume correction coefficient of each of the indoor units, and calculating a maximum frequency capacity (Qmax) of each operating indoor unit on the basis of the determined air-volume correction coefficient of each indoor unit; and limiting a maximum frequency of the compressor for each air-volume according to the calculated maximum operation capacity (Qmax).
  • the maximum operation capacity of each operating indoor unit is calculated by the following equation: wherein, the capacity for each indoor unit indicates capacity values varying with conditions of the operating indoor units, the air-volume correction coefficient for each indoor unit indicates the air-volume correction values determined according to the air-volumes of the operating indoor units, the capacity calculation coefficient indicates a proportional constant calculated by the capacity and air-volume correction coefficient for each indoor unit, the average air-volume correction coefficient of the operating indoor units indicates an average value of air-volume correction values determined according to the air-volumes of the operating indoor units, and the capacity calculation constant indicates an error value for reducing an error rate created when the capacities of the indoor units are calculated.
  • the capacity for each indoor unit, the capacity calculation coefficient, and the capacity calculation constant are indicative of data pre-stored in a controller according to situations of the operating indoor units.
  • the method further comprises: if the combination ratio of the indoor units is higher than the reference combination ratio, limiting the frequency-rising width of the compressor to a default value indicating an allowable capacity of the compressor, irrespective of the air-volumes of the operating indoor units, and operating the air-conditioner.
  • a multi-system air-conditioner comprising: an outdoor unit; a plurality of indoor units connected to the outdoor unit; a compressor for varying its own frequency according to operation capacity of the indoor units; and a controller for comparing a setup temperature with a room temperature by each of the indoor units, calculating a capacity required for each indoor unit, calculating the sum of all the required capacities of the indoor units to calculate a combination ratio of all the operating indoor units, comparing the calculated combination ratio with a reference combination ratio to determine whether the combination ratio of the indoor units is equal to or less than the reference combination ratio, limiting a frequency-rising width of the compressor to a predetermined value according to air-volumes of the operating indoor units when the calculated combination ratio is equal to or less than the reference combination ratio, and operating the air-conditioner at the limited value.
  • the controller is indicative of an outdoor controller contained in the outdoor unit.
  • the controller checks the air-volumes of all the operating indoor units, determines an air-volume correction coefficient of each of the indoor units, calculates a maximum frequency capacity (Qmax) of each operating indoor unit on the basis of the determined air-volume correction coefficient of each indoor unit, and limits a maximum frequency of the compressor for each air-volume according to the calculated maximum operation capacity (Qmax).
  • Qmax maximum frequency capacity
  • the controller limits the frequency-rising width of the compressor to a default value indicating an allowable capacity of the compressor, irrespective of the air-volumes of the operating indoor units, and operates the air-conditioner.
  • FIG. 2 is a conceptual diagram illustrating refrigerant passages of an air-conditioner according to the present invention.
  • the multi-system air-conditioner includes a single outdoor unit 10 and four indoor units 20A, 20B, 20C, and 20D connected to the single outdoor unit 10.
  • the multi-system air-conditioner includes the single outdoor unit 10 and a plurality of indoor units 20A, 20B, 20C, and 20D connected in parallel to the outdoor unit 10, and arranges refrigerant pipes between the indoor units 20A, 20B, 20C, 20D and the outdoor unit 10, so that the indoor units 20A, 20B, 20C, and 20D are connected to the outdoor unit 10 via the refrigerant pipes.
  • the outdoor unit 10 includes a compressor 11, a 4-way valve 12, an outdoor heat-exchanger 13, an outdoor unit fan 14, four electronic expansion valves (EEVs), and an accumulator 16.
  • the four electronic expansion valves (EEVs) correspond to the four indoor units 20A, 20B, 20C, and 20D, respectively.
  • the indoor units 20A, 20B, 20C, and 20D include the indoor heat-exchangers 21A, 21 B, 21C, and 21D, indoor fans 22A, 22B, 22C, and 22D, and indoor temperature sensors 23A, 23B, 23C, and 23D, respectively.
  • the compressor 11 is used as an inverter-type compressor, which compresses the absorbed refrigerant of a low-temperature and low-pressure so that it discharges the gaseous refrigerant of a high-temperature and high-pressure.
  • the 4-way valve 12 includes two independent passages, so that the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is applied to the indoor heat-exchangers 21A, 21 B, 21C, and 21 D via one of the two passages during the heating mode, and is applied to the outdoor heat-exchanger 13 via the other passage during the cooling mode. If the user selects the heating mode or the cooling mode, the 4-way valve 12 is switched on or off to divert the flow of the refrigerant according to the user-selected operation mode.
  • the outdoor heat-exchanger 13 serves as a condenser for condensing the high-temperature and high-pressure gas refrigerant to the normal-temperature and high-pressure liquid refrigerant in the cooling mode. And, the outdoor heat-exchanger 13 serves as an evaporator for evaporating the low-temperature and low-pressure liquid refrigerant to the gas refrigerant in the heating mode. As a result, the outdoor heat-exchanger 13 can exchange heat with peripheral air according to enthalpy variation.
  • the outdoor fan 14 serves as a catalyzer for expediting the heat-exchanging operation between the refrigerant flowing in the outdoor heat-exchanger 13 and the air, so that the heat-exchanging capacity of the outdoor unit 10 increases.
  • the EEVs 15A, 15B, 15C, and 15D are connected between the outdoor heat-exchanger 13 and the indoor heat-exchangers 21 A, 21 B, 21C, and 21D, and expand the normal-temperature and high-pressure liquid refrigerant condensed by one of the heat-exchangers to the low-temperature and low-pressure refrigerant in which the liquid refrigerant and the gas refrigerant are mixed, so that the refrigerant is depressurized.
  • the accumulator 16 is mounted to a suction part of the compressor 11, so that the refrigerant sucked from the compressor 11 is changed to the gas refrigerant.
  • the indoor heat-exchangers 21A, 21B, 21C, and 21D serve as an evaporator in the cooling mode, and serve as a condenser in the heating mode, thereby exchanging heat with peripheral air.
  • the indoor fans 22A, 22B, 22C, and 22D expedites the heat-exchanging between the refrigerant flowing in the indoor heat-exchanger 21A, 21B, 21C, or 21D and the air, and at the same time discharge the cool or warm air to the room to be cooled or heated.
  • the indoor temperature sensors 23A, 23B, 23C, and 23D detect the room temperatures of the individual indoor units 20A, 20B, 20C, and 20D.
  • the above-mentioned multi-system air-conditioner diverts the flow of refrigerant by switching the 4-way valve 12 according to a user command.
  • the 4-way valve is switched on so that the refrigerant forms a cooling cycle along the solid-line arrow of FIG. 2 , in which the cooling cycle is composed of the compressor 11 ⁇ the 4-way valve 12 ⁇ the indoor heat-exchangers 21A, 21B, 21C, and 21D ⁇ the EEVs 15A, 15B, 15C, and 15D ⁇ the outdoor heat-exchanger 13 ⁇ the 4-way valve 12 ⁇ the accumulator 16 ⁇ the compressor 11.
  • the 4-way valve 12 is switched off so that the refrigerant forms a cooling cycle along with the dotted-line arrow of FIG. 2 , in which the cooling cycle is composed of the compressor 11 ⁇ the 4-way valve 12 ⁇ the EEVs 15A, 15B, 15C, and 15D ⁇ the indoor heat-exchangers 21A, 21B, 21C, and 21D ⁇ the 4-way valve 12 ⁇ the accumulator 16 ⁇ the compressor 11.
  • FIG. 3 is a block diagram illustrating a multi-system air-conditioner according to the present invention.
  • the outdoor unit 10 includes a microcomputer (also called a microprocessor) and its peripheral circuits, and further includes an outdoor controller 17 for controlling overall operations of the outdoor unit 10, and an inverter circuit 18 for controlling an output frequency of the compressor 11 to change a rotation number of the compressor 11.
  • a microcomputer also called a microprocessor
  • the outdoor controller 17 for controlling overall operations of the outdoor unit 10
  • an inverter circuit 18 for controlling an output frequency of the compressor 11 to change a rotation number of the compressor 11.
  • the outdoor controller 17 receives the cooling or heating command from the individual indoor units 20A, 20B, 20C, and 20D, controls the refrigerant discharged from the compressor 11 to flow in either the outdoor heat-exchanger 13 or the indoor heat-exchanger 21A, 21B, 21C, and 21D via the 4-way valve 12, so that the cooling or heating operation is carried out.
  • the outdoor controller 17 receives a control signal from the indoor units 20A, 20B, 20C, and 20D and the comparison result between the setup temperature and the room temperature, and controls rotation of the EEVs 15A, 15B, 15C, and 15D, the outdoor fan 14, and the rotation number of the compressor 11.
  • the outdoor controller 17 controls the capacity of the compressor 11 (i.e., the output frequency of the inverter circuit) according to the sum of capacities (i.e., the cooling/heating capacities) required for the indoor units 20A, 20B, 20C, and 20D.
  • the inverter circuit 18 rectifies the voltage supplied from the commercial AC source, converts the rectified voltage into a voltage level of a predetermined frequency according to a control command of the outdoor controller 17, and transmits the converted result to the compressor 11.
  • the indoor units 20A, 20B, 20C, or 20D include the microcomputer and its peripheral circuits, and further include the indoor controllers 24A, 24B, 24C, and 24D for controlling overall operations of the indoor units 20A, 20B, 20C, and 20D, respectively.
  • the indoor controllers 24A, 24B, 24C, and 24D are connected to the outdoor controller 17 via a communication line, and transmit user commands (e.g., the setup temperature and the setup air-volume) entered by a remote-controller and the room temperatures of the respective indoor temperature sensors 23A, 23B, 23C, and 23D to the outdoor controller 17.
  • user commands e.g., the setup temperature and the setup air-volume
  • FIGS. 4A to 4B are flow charts illustrating a method for operating the multi-system air-conditioner according to the present invention.
  • the multi-system air-conditioner including four indoor units 20A, 20B, 20C, and 20D connected to only one outdoor unit 10 is designed to control a maximum operation frequency of the compressor 11, and a detailed description thereof will hereinafter be described.
  • the outdoor controller 17 determines whether the multi-system air-conditioner starts operation at operation S100. If it is determined that the multi-system air-conditioner starts operation at operation S100, the outdoor controller 17 receives operation information (e.g., the setup temperature and the setup air-volume) entered by the user from the indoor controllers 24A, 24B, 24C, and 24D contained in the indoor units 20A, 20B, 20C, and 20D at operation S102.
  • operation information e.g., the setup temperature and the setup air-volume
  • the indoor temperature sensors 23A, 23B, 23C, and 23D of the indoor units 20A, 20B, 20C, and 20D detect the room temperature of the individual indoor units 20A, 20B, 20C, and 20D, and deliver the detected result to the indoor controllers 24A, 24B, 24C, and 24D, respectively, at operation S104.
  • the indoor controllers 24A, 24B, 24C, and 24D compare the setup temperatures of the indoor units 20A, 20B, 20C, and 20D with the room temperature, calculate the appropriate cooling/heating capacity using the required capacity values of the indoor units 20A, 20B, 20C, and 20D, respectively, and transmit the calculated result to the outdoor controller 17 at operation S106.
  • the outdoor controller 17 calculates the sum of the calculated capacities of the indoor units 20A, 20B, 20C, and 20D, and calculates capacities required for all the indoor units 20A, 20B, 20C, and 20D at operation S108.
  • each indoor unit 20A, 20B, 20C, or 20D compares the setup temperature with the room temperature, and calculates the required capacity to acquire the appropriate cooling/heating capacity according to the comparison result, so that the required capacities of all the indoor units 20A, 20B, 20C, and 20D can be calculated, and a detailed description thereof will herein be omitted for the convenience of description.
  • the outdoor controller 17 compares the calculated capacity Q with a second reference capacity Q2 (i.e., 130%) at operation S110. If the calculated capacity Q is higher than the second reference capacity Q2 at operation S110, the outdoor controller 17 determines that the combination ratio (i.e., the sum of all capacities of the indoor units 20A, 20B, 20C, and 20D) of the capacities of the indoor units 20A, 20B, 20C, and 20D is equal to or higher than 130%.
  • a second reference capacity Q2 i.e. 130%) at operation S110. If the calculated capacity Q is higher than the second reference capacity Q2 at operation S110, the outdoor controller 17 determines that the combination ratio (i.e., the sum of all capacities of the indoor units 20A, 20B, 20C, and 20D) of the capacities of the indoor units 20A, 20B, 20C, and 20D is equal to or higher than 130%.
  • This combination ratio of 130% indicates that the area of evaporators of the indoor units 20A, 20B, 20C, and 20D is very large, so that the outdoor controller 17 may have difficulty in obtaining a sufficient temperature of the discharging air although a frequency increases to an allowable capacity of the compressor 11. Therefore, if the cooling mode is required due to a high difference between the room temperature and the setup temperature, the outdoor controller 17 allows the compressor 11 to be operated within a predetermined range from an initial frequency to a maximum frequency (about 100Hz) indicating a default value, irrespective of the air-volume of the indoor unit 20A, 20B, 20C, or 20D, so that the maximum frequency of the compressor 11 is limited to the default frequency and the compressor 11 is operated at operation S112 as shown in FIG. 5 .
  • the outdoor controller 17 compares the calculated capacity Q with a first reference capacity Q1 (i.e., 100%) at operation S114. If the calculated capacity Q is higher than the first reference capacity Q1 at operation S114, the outdoor controller 17 determines that the combination ratio of the capacities of the indoor units 20A, 20B, 20C, and 20D is in the range from 100% to 130%. This combination ratio of 100% ⁇ 130% indicates that the area of evaporators of the indoor units 20A, 20B, 20C, and 20D is larger than the capacity of the outdoor unit 10, the compressor 11 limits its own maximum frequency to the rated frequency of about 60Hz as shown in FIG. 5 , so that the operation range of the compressor 11 is equal to the range from the rated capacity to the minimum capacity at operation S116.
  • a first reference capacity Q1 i.e., 100%
  • the outdoor controller 17 allows the capacity to increase to the rated capacity.
  • the outdoor controller 17 determines that the combination ratio of the indoor units 20A, 20B, 20C, and 20D is equal to or less than 100%.
  • This combination ratio of 100% or less indicates that the combination ratio (i.e., the sum of all capacities of the indoor units 20A, 20B, 20C, and 20D) of the indoor units 20A, 20B, 20C, and 20D is less than that of the outdoor unit 10.
  • the operation capacity drops to 80%, the discharging air has a sufficiently-low temperature when all the air-volumes of the indoor units 20A, 20B, 20C, and 20D indicate the weak air-volume.
  • the temperature of the air discharged from the indoor units 20A, 20B, 20C and 20D may be decreased according to the air volumes of the indoor units 20A, 20B, 20C, and 20D.
  • the outdoor controller 17 must calculate the maximum operation capacity in consideration of the air-volumes of the indoor units 20A, 20B, 20C, and 20D, and must control the maximum frequency of the compressor 11.
  • the outdoor controller 17 determines whether the air-volume of a predetermined indoor unit (e.g., the indoor unit A) from among the operating indoor units 20A, 20B, 20C, and 20D is the strong air-volume at operation S118. If the strong air-volume mode is decided at operation S118, the correction coefficient of the air-volume is set to "RH" (e.g., about 1.2 in the strong air-volume mode) at operation S120.
  • RH e.g., about 1.2 in the strong air-volume mode
  • the outdoor controller 17 determines whether the air-volume of the operating indoor unit (e.g., the indoor unit A) is not equal to the strong air-volume at operation S118. If it is determined whether the air-volume of the operating indoor unit (e.g., the indoor unit A) is not equal to the strong air-volume at operation S118, the outdoor controller 17 determines whether the air-volume of the aforementioned operating indoor unit is equal to the medium air-volume at operation S122. If the medium air-volume is decided at operation S122, the outdoor controller 17 sets the air-volume correction coefficient to "RM" (e.g., about 1.0 in the medium air-volume mode) at operation S124.
  • RM air-volume correction coefficient
  • the outdoor controller 17 determines that the operating indoor unit has the weak air-volume so that it sets the air-volume correction coefficient to "RL" (e.g., about 0.7 in the weak air-volume mode) at operation S126.
  • the capacity for each indoor unit indicates the capacity values varying with the condition of the operating indoor units 20A, 20B, 20C, and 20D.
  • the air-volume correction coefficient for each indoor unit indicates the air-volume correction values determined according to the air-volumes of the operating indoor units 20A, 20B, 20C, and 20D.
  • the capacity calculation coefficient indicates a proportional constant calculated by the capacity and air-volume correction coefficient for each indoor unit.
  • the average air-volume correction coefficient of the operating indoor units indicates an average value of the air-volume correction values determined according to the air-volumes of the operating indoor units 20A, 20B, 20C, and 20D.
  • the capacity calculation constant indicates an error value for reducing the error rate created when the capacities of the indoor units 20A, 20B, 20C, and 20D are calculated.
  • the capacity for each indoor unit, the capacity calculation coefficient, and the capacity calculation constant are acquired from basic data prescribed in the outdoor controller 17 according to conditions of the operating indoor units 20A, 20B, 20C, and 20D, and are pre-stored in an internal memory of the outdoor controller 17.
  • the outdoor controller 17 variably controls the maximum frequency of the compressor 11 according to the maximum operation capacity Qmax of the indoor units 20A, 20B, 20C, and 20D, as shown in FIG. 5 , at operation S132.
  • the outdoor controller 17 determines whether the multi-system air-conditioner stops operation at operation S134. If the multi-system air-conditioner does not stop operation at operation S134, the outdoor controller 17 returns to the operation S104. If the multi-system air-conditioner stops operation at operation S134, the outdoor controller 17 stops all operations of the multi-system air-conditioner.
  • the multi-system air-conditioner and a method for operating the same according to the present invention differently set the frequency-rising limitation width of the compressor according to situations of the indoor units, so that the temperature of the discharging air can be similarly maintained in the respective situations.
  • the multi-system air-conditioner actively reflects the situations of the indoor units, so that it can provide the user with a more comfortable environment and can prevent the interior of a house or room from being damaged by an extremely-low air-temperature which may encounter the dewy interior and the water-scattering of the condenser.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
EP07120691.6A 2007-02-06 2007-11-14 Mehrsystem-Klimaanlage und Steuerverfahren dafür Active EP1956306B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070012409A KR101151321B1 (ko) 2007-02-06 2007-02-06 멀티형 공기조화기 및 그 운전방법

Publications (3)

Publication Number Publication Date
EP1956306A2 true EP1956306A2 (de) 2008-08-13
EP1956306A3 EP1956306A3 (de) 2013-10-16
EP1956306B1 EP1956306B1 (de) 2019-09-18

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CN110469926B (zh) 2018-05-11 2022-05-24 开利公司 用于空调系统的水循环系统及其控制方法
CN111256347B (zh) * 2018-11-30 2022-09-02 广东美的制冷设备有限公司 推荐端、接收端、舒适温区的推送方法和存储介质
CN114251717B (zh) * 2020-09-24 2023-09-01 广东美的制冷设备有限公司 一拖多空调及分歧器、分歧器与室外机的控制方法、介质

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EP3054231A4 (de) * 2013-09-30 2017-06-14 Daikin Industries, Ltd. Klimaanlagensystem und steuerungsverfahren dafür
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KR20080073602A (ko) 2008-08-11
EP1956306B1 (de) 2019-09-18
CN101240933B (zh) 2010-06-30
KR101151321B1 (ko) 2012-06-08
EP1956306A3 (de) 2013-10-16
CN101240933A (zh) 2008-08-13

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