KR20060117755A - Method for controlling operation of a multi air conditioner system - Google Patents

Method for controlling operation of a multi air conditioner system Download PDF

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KR20060117755A
KR20060117755A KR1020050040280A KR20050040280A KR20060117755A KR 20060117755 A KR20060117755 A KR 20060117755A KR 1020050040280 A KR1020050040280 A KR 1020050040280A KR 20050040280 A KR20050040280 A KR 20050040280A KR 20060117755 A KR20060117755 A KR 20060117755A
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South Korea
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temperature
indoor unit
indoor
heat exchanger
electric valve
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KR1020050040280A
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Korean (ko)
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KR100667167B1 (en
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김경훈
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삼성전자주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • 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
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
    • F25B2700/21172—Temperatures of an evaporator of the fluid cooled by the evaporator at the inlet
    • 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
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
    • F25B2700/21173—Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet

Abstract

A driving control method of a multiple air conditioner system is provided to optimally control the amount of coolant flowed at an indoor machine by regulating openness of an electromotive valve of the indoor machine through exhaust temperature felt by a user and to thereby improve cooling/heating efficiency. A driving control method of a multiple air conditioner system comprises the steps for judging heating mode of the multiple air conditioner system(S110); computing a temperature difference by sensing intake temperature and discharge temperature of an indoor machine while heating a room(S140); comparing the computed temperature difference with a preset standard temperature and sensing temperature at an inlet of the heat exchanger of the indoor machine to calculate average value when the temperature difference is larger than the standard temperature(S150); and comparing the calculated average with the temperature of the heat exchanger inlet of the indoor machine to regulate openness of the electromotive valve(S180).

Description

멀티 에어컨 시스템의 운전제어방법{Method for controlling operation of a multi air conditioner system}Method for controlling operation of a multi air conditioner system

도 1은 본 발명의 일실시예에 의한 멀티 에어컨 시스템의 냉매 유로도,1 is a refrigerant flow diagram of a multi-air conditioner system according to an embodiment of the present invention;

도 2는 본 발명의 일실시예에 의한 멀티 에어컨 시스템의 제어 구성도,2 is a control block diagram of a multi-air conditioner system according to an embodiment of the present invention;

도 3은 본 발명에 의한 멀티 에어컨 시스템의 난방운전 제어방법의 동작 흐름도,3 is an operation flowchart of a heating operation control method of a multi-air conditioner system according to the present invention;

도 4는 본 발명에 의한 멀티 에어컨 시스템의 냉방운전 제어방법의 동작 흐름도.4 is an operation flowchart of a cooling operation control method of a multi-air conditioner system according to the present invention;

*도면의 주요부분에 대한 부호 설명** Description of symbols on the main parts of the drawings *

10 : 실외기 12a,12b : 압축기10: outdoor unit 12a, 12b: compressor

22 : 실외 전동변 26 : 실외기 제어부22: outdoor electric valve 26: outdoor unit control unit

50 : 실내기 52 : 실내열교환기50: indoor unit 52: indoor heat exchanger

58 : 실내 전동변 62 : 실내열교환기 입구온도센서58: indoor electric valve 62: inlet temperature sensor of the indoor heat exchanger

64 : 실내기 흡입온도센서 66 : 실내기 토출온도센서64: Indoor unit suction temperature sensor 66: Indoor unit discharge temperature sensor

68 : 실내기 제어부68: indoor unit control unit

본 발명은 하나의 실외기에 복수의 실내기가 연결되는 냉난방 겸용의 멀티 에어컨 시스템에 관한 것으로, 특히 실내기 토출온도에 따라 운전중인 실내기의 전동변 개도를 조절하여 실내기에 흐르는 냉매량을 최적으로 제어하는 멀티 에어컨 시스템의 운전제어방법에 관한 것이다.The present invention relates to a multi-air conditioning system for both air conditioning and heating, in which a plurality of indoor units are connected to one outdoor unit, and in particular, a multi air conditioner for optimally controlling the amount of refrigerant flowing to the indoor unit by adjusting the electric valve opening degree of the indoor unit in operation according to the indoor unit discharge temperature. It relates to an operation control method of the system.

일반적으로, 에어컨은 실내의 냉방 또는 난방을 수행하기 위한 목적으로 사용되는 장치로서, 실내기 및 실외기 상호간에 냉매를 순환시켜 액체상태의 냉매가 기화할 때에 주위의 열을 흡수하며 액화할 때에 그 열을 방출하는 특성에 의하여 냉방 또는 난방작용을 수행하게 되며, 에어컨의 냉방 또는 난방작용은 그 냉매의 순환방향에 따라 결정된다.In general, an air conditioner is a device used for cooling or heating indoors, and circulates a refrigerant between an indoor unit and an outdoor unit to absorb ambient heat when the liquid refrigerant evaporates and absorbs the heat when liquefied. Cooling or heating is performed by the releasing property, and cooling or heating of the air conditioner is determined according to the circulation direction of the refrigerant.

통상의 에어컨은 하나의 실외기에 하나의 실내기를 설치하는 것이 일반적이나, 최근에는 하나 또는 하나 이상의 실외기에 다양한 형태와 용량을 갖는 복수의 실내기를 연결하여 학교나 회사, 그리고 빌딩과 같이 분리된 공간이 다수 개 존재하는 장소에 대하여 각각 냉방 또는 난방운전을 수행하는 멀티 에어컨(Multi-system air conditioner)에 대한 사용자의 요구가 증가하는 추세이다.A typical air conditioner is to install one indoor unit in one outdoor unit, but recently, a plurality of indoor units having various shapes and capacities are connected to one or more outdoor units to separate a space such as a school, a company, and a building. Increasingly, user demands for multi-system air conditioners that perform cooling or heating operations for a plurality of places, respectively, are increasing.

이러한 멀티 에어컨은 각각의 실내기가 설치된 장소의 환경적 특성 변화에 따라 각 실내기마다 냉방 또는 난방요구능력이 변화한다. 따라서 이러한 능력변화에 따라 운전정지 중인 실내기에 설치된 전동변의 개도를 미리 정해진 개도로 유지하고, 운전 중인 실내기에 설치된 전동변은 운전상태에 따라 적절하게 개도를 조절하고 있으며, 이러한 방식으로는 대한민국 공개특허공보 제2003-0073358호가 있다.The multi-air conditioner has a cooling or heating demand for each indoor unit according to the change in the environmental characteristics of the place where each indoor unit is installed. Therefore, in accordance with this change in capability, the opening of the electric valve installed in the indoor unit under operation is maintained at a predetermined opening degree, and the electric valve installed in the indoor unit in operation is appropriately adjusted according to the operating state. Publication 2003-0073358.

그런데, 동 공보에 개시된 종래의 멀티 에어컨 시스템은 전체 실내기 중에서 일부 실내기만 가동되고 있을 때 전체 시스템의 운전상황을 고려하지 않고 운전정지 중인 실내기의 전동변을 항상 일정한 개도로 유지하여 운전 중인 실내기로 흐르는 냉매량이 적절하지 않은 경우 전체 시스템의 효율이 떨어지는 문제점이 있었다.However, the conventional multi-air conditioner system disclosed in the publication does not take into consideration the operating situation of the entire system when only some indoor units are operating in the entire indoor unit, and always maintains the electric valve of the indoor unit in operation at a constant opening degree and flows to the indoor unit in operation. If the amount of refrigerant is not appropriate there was a problem that the efficiency of the entire system is lowered.

즉, 운전정지 중인 실내기에 설치된 전동변의 개도가 지나치게 크면 운전정지 중인 실내기로 많은 양의 냉매가 흐르고 상대적으로 운전 중인 실내기로 흐르는 냉매의 양이 감소되어 시스템의 냉난방효율이 낮아지는 문제점이 있었다.In other words, if the opening degree of the electric valve installed in the indoor unit during operation is too large, a large amount of refrigerant flows into the indoor unit during operation, and the amount of refrigerant flowing to the indoor unit during operation is reduced, thereby reducing the cooling and heating efficiency of the system.

반대로, 운전정지 중인 실내기에 설치된 전동변의 개도가 지나치게 작으면 운전정지 중인 실내기로 냉매가 거의 흐를 수 없으므로 전체 냉매 중에서 일부 냉매가 운전정지 중인 실내기의 실내열교환기에 정체되고(특히, 난방운전 시), 그에 따라 냉매유로를 순환하는 냉매량이 줄어들어 시스템의 전체적인 냉난방효율이 저하된다는 문제점이 있었다.On the contrary, if the opening degree of the electric valve installed in the indoor unit that is in operation is too small, the refrigerant can hardly flow to the indoor unit that is in operation. Therefore, some of the refrigerant is stagnated in the indoor heat exchanger of the indoor unit in operation. As a result, the amount of refrigerant circulating in the refrigerant passage is reduced, thereby reducing the overall cooling and heating efficiency of the system.

이러한 문제점을 해결하기 위해 운전 중인 실내기의 입출구 배관온도센서를 이용하여 운전 중인 실내기의 전동변 개도를 제어하는 알고리즘이 다양하게 제시되고 있는 바, 종래에는 난방 시 운전 중인 실내기의 입구배관온도 평균값을 계산하여 평균값보다 입구배관온도가 높은 실내기는 전동변 개도를 닫고, 평균값보다 입구배관온도가 낮은 실내기는 전동변 개도를 열어 실내기에 흐르는 냉매량을 제어하였다. 이는 실내기에 흐르는 냉매량을 입구배관온도값으로 추정하여 실내기의 전동변을 제어하는 것으로 사용자가 실제로 느끼는 실내기 토출온도와는 차이가 있었다.In order to solve this problem, various algorithms for controlling the electric valve opening degree of the indoor unit in operation by using the inlet / outlet pipe temperature sensor of the indoor unit in operation are proposed. Therefore, the indoor unit of which the inlet piping temperature was higher than the average value closed the electric valve opening degree, and the indoor unit of which the inlet piping temperature was lower than the average value opened the electric valve opening degree to control the amount of refrigerant flowing in the indoor unit. This is to estimate the amount of refrigerant flowing in the indoor unit by the inlet pipe temperature value to control the electric valve of the indoor unit was different from the indoor unit discharge temperature actually felt by the user.

반면, 냉방 시는 실내기의 입출구 배관온도차를 이용하여 과열도 제어를 실시함으로서 배관온도센서의 배관 밀착여부 및 홀더의 삽입정도에 따라 배관온도를 오감지하였을 경우 실내기의 전동변 개도를 정확히 조절할 수 없기 때문에 사용자가 느끼는 실제 토출온도와 많은 차이가 발생한다. On the other hand, when cooling, by controlling the superheat degree by using the temperature difference between the inlet and outlet of the indoor unit, if the pipe temperature is incorrectly sensed according to the tightness of the pipe of the pipe temperature sensor and the degree of insertion of the holder, the electric valve opening degree of the indoor unit cannot be adjusted accurately. Therefore, a large difference occurs with the actual discharge temperature felt by the user.

예를 들어, 실내기의 배관온도센서 위치가 냉매의 실내열교환기 패스 중에 과열되는 부분이 아닌 액상이 혼입되는 부분의 값을 감지하게 되면, 타 패스의 과열되는 부분 때문에 토출온도는 사용자가 원하는 낮은 온도 또는 높은 온도를 유지하지 않음에도 불구하고 계속해서 실내기의 전동변을 지속적으로 닫아 주게 된다.For example, if the position of the pipe temperature sensor of the indoor unit detects the value of the liquid phase in which the liquid is mixed in the indoor heat exchanger pass of the refrigerant, the discharge temperature may be a low temperature desired by the user due to the overheated portion of the other pass. Or, even though it does not maintain a high temperature, it keeps closing the electric valve of the indoor unit continuously.

또한, 반대의 경우 토출온도가 사용자가 원하는 수준에 도달하였음에도 불구하고, 냉매배관온도가 온도차를 높게 읽을 경우(냉방 시) 전동변을 지속적으로 열어 멀티 에어컨 시스템에서 타 실내기로 분배되는 냉매를 효율적으로 사용하지 못하게 된다.On the contrary, even if the discharge temperature reaches the level desired by the user, when the refrigerant piping temperature reads a high temperature difference (when cooling), the electric valve is continuously opened to efficiently cool the refrigerant distributed to other indoor units in the multi-air conditioner system. You will not be able to use it.

이는 사용자가 실제로 느끼는 실내기 토출온도는 고려하지 않고 배관온도만을 가지고 실내기에 흐르는 냉매량을 제어함으로서 정확한 냉난방을 할 수 없어 소비자의 불만이 가중되고 크레임의 주요한 원인이 되는 문제점을 초래하게 된다.This does not take into account the discharge temperature of the indoor unit that the user actually feels and controls the amount of refrigerant flowing to the indoor unit using only the piping temperature, which prevents accurate cooling and heating.

따라서, 본 발명은 상기와 같은 종래의 문제점을 해결하기 위한 것으로, 본 발명의 목적은 사용자가 실제로 느끼는 실내기 토출온도를 이용하여 운전중인 실내기의 전동변 개도를 제어함으로서 냉난방성능을 향상시킬 수 있는 멀티 에어컨 시스템의 운전제어방법을 제공하는데 있다.Accordingly, the present invention is to solve the conventional problems as described above, an object of the present invention is to control the electric shift degree of the indoor unit in operation by using the indoor unit discharge temperature actually felt by the user can improve the heating and cooling performance multi An operation control method of an air conditioning system is provided.

상기 목적을 달성하기 위하여 본 발명은, 복수의 실내기와, 상기 복수의 실내기로 흐르는 냉매량을 분배제어하는 복수의 전동변을 가지는 멀티 에어컨 시스템의 제어방법에 있어서, 상기 멀티 에어컨 시스템이 난방운전인가 판단하고, 난방운전이면 운전 중인 실내기의 흡입온도와 토출온도를 감지하여 온도차를 산출하고, 산출된 온도차와 미리 정해진 기준온도를 비교하여 상기 온도차가 기준온도보다 크면 운전 중인 실내기의 열교환기 입구온도를 감지하여 평균값을 계산하고, 계산된 평균값을 운전 중인 실내기의 열교환기 입구온도와 각각 비교하여 상기 전동변의 개도를 제어하는 것을 특징으로 한다.In order to achieve the above object, the present invention provides a control method of a multi-air conditioner system having a plurality of indoor units and a plurality of electric valves for distributing and controlling the amount of refrigerant flowing into the plurality of indoor units, wherein the multi-air conditioner system is determined to be a heating operation. In the heating operation, the temperature difference is calculated by detecting the suction temperature and the discharge temperature of the indoor unit in operation, and the heat exchanger inlet temperature of the indoor unit in operation is detected when the temperature difference is greater than the reference temperature by comparing the calculated temperature difference with a predetermined reference temperature. The average value is calculated, and the calculated average value is compared with the heat exchanger inlet temperature of the indoor unit in operation to control the opening degree of the electric valve.

상기 온도차가 기준온도보다 작으면 운전 중인 실내기의 전동변 개도를 완전 개방하여 토출온도를 제어하는 것을 특징으로 한다.When the temperature difference is less than the reference temperature is characterized in that the discharge temperature is controlled by fully opening the electric motor drive degree of the indoor unit in operation.

상기 전동변의 개도 제어는, 상기 열교환기 입구온도가 평균값과 같을 경우 운전 중인 실내기의 전동변 개도를 고정하고, 상기 열교환기 입구온도가 평균값과 같지 않을 경우 운전 중인 실내기의 전동변 개도를 개폐 제어하는 것을 특징으로 한다.The opening degree control of the electric valve is to control the opening of the electric valve of the indoor unit in operation when the heat exchanger inlet temperature is equal to the average value, and to open and control the electric valve opening degree of the indoor unit in operation when the heat exchanger inlet temperature is not equal to the average value. It is characterized by.

또한, 본 발명은 복수의 실내기와, 상기 복수의 실내기로 흐르는 냉매량을 분배제어하는 복수의 전동변을 가지는 멀티 에어컨 시스템의 제어방법에 있어서, 상기 멀티 에어컨 시스템이 냉방운전인가 판단하고, 냉방운전이면 운전 중인 실내기의 열교환기 입구온도와 토출온도를 감지하여 온도차를 산출하고, 산출된 온도차와 미리 정해진 기준온도를 비교하여 상기 온도차가 기준온도범위를 벗어나면 상기 전동변의 개도를 제어하는 것을 특징으로 한다.In addition, the present invention provides a control method of a multi-air conditioner system having a plurality of indoor units and a plurality of electric valves for distribution control of the amount of refrigerant flowing into the plurality of indoor units. The temperature difference is calculated by detecting the heat exchanger inlet temperature and the discharge temperature of the indoor unit in operation, and comparing the calculated temperature difference with a predetermined reference temperature to control the opening degree of the electric valve when the temperature difference is out of the reference temperature range. .

상기 전동변의 개도 제어는, 상기 온도차가 기준온도보다 작을 경우 운전 중인 실내기의 전동변 개도를 닫아 주고, 상기 온도차가 기준온도보다 클 경우 운전 중인 실내기의 전동변 개도를 열어 주는 것을 특징으로 한다.When the temperature difference is less than the reference temperature, the opening degree control of the electric valve closes the electric valve opening degree of the indoor unit in operation and opens the electric valve opening degree of the indoor unit in operation when the temperature difference is greater than the reference temperature.

이하, 본 발명의 일실시예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 일실시예에 의한 멀티 에어컨 시스템의 냉매 유로도로서, 냉매의 흐름방향에 따라 냉방 또는 난방을 수행할 수 있으며, 본 발명에서는 냉방싸이클을 중심으로 설명한다.1 is a refrigerant flow path diagram of a multi-air conditioner system according to an exemplary embodiment of the present invention, which may perform cooling or heating according to a flow direction of a refrigerant, and the present invention will be described based on a cooling cycle.

도 1에서, 본 발명의 멀티 에어컨 시스템은 통상의 냉매싸이클을 형성하는 하나의 실외기(10)와, 실외기(10)에 병렬 연결된 복수의 실내기(50)를 구비한다.In FIG. 1, the multi-air conditioner system of the present invention includes one outdoor unit 10 forming a conventional refrigerant cycle and a plurality of indoor units 50 connected in parallel to the outdoor unit 10.

상기 실외기(10)는 냉매를 고온고압의 기체상태로 압축하는 압축기(12a,12b)와, 상기 압축기(12a,12b)에서 압축된 고온고압 기체냉매의 흐름방향을 운전모드(냉방 또는 난방)에 따라 조절하는 사방밸브(14)와, 상기 압축기(12a,12b)에서 압축된 고온고압의 기체냉매를 전달받아 실외공기와 열교환하는 실외열교환기(16)와, 상기 실외열교환기(16)에서 열교환이 이루어지도록 실외팬모터(20)에 의해 실외공기를 강제 송풍시키는 실외팬(18)과, 냉매 유량을 조절하면서 열교환된 냉매를 감압 팽창시키는 전자팽창밸브(22;이하 실외 전동변이라 한다)를 포함한다.The outdoor unit 10 includes a compressor (12a, 12b) for compressing the refrigerant into a gas state of high temperature and high pressure, and the flow direction of the high temperature and high pressure gas refrigerant compressed by the compressor (12a, 12b) to the operation mode (cooling or heating) Four-way valve 14 to adjust according to, the outdoor heat exchanger 16 for receiving a high-temperature, high-pressure gas refrigerant compressed by the compressor (12a, 12b) and heat exchange with the outdoor air, and the heat exchanger in the outdoor heat exchanger (16) The outdoor fan motor 20 forcibly blown the outdoor air by the outdoor fan motor 20 and the electromagnetic expansion valve 22 (hereinafter referred to as the outdoor electric valve) for reducing and expanding the heat exchanged refrigerant while controlling the flow rate of the refrigerant to control the flow of the refrigerant. Include.

상기 실외 전동변(22, EEV: Electronic Expansion Valve)은 그 개도에 따라 냉매의 과열도 및 과냉도를 조절한다.The outdoor electric valve 22 (EEV: Electronic Expansion Valve) adjusts the superheat degree and the supercooling degree of the refrigerant according to its opening degree.

상기 압축기(12a,12b)의 흡입측에는 압축기(12a,12b)에 유입되는 냉매를 완 전 기체상태의 가스로 변환시키는 어큐뮬레이터(24)가 설치된다.At the suction side of the compressors 12a and 12b, an accumulator 24 for converting the refrigerant flowing into the compressors 12a and 12b into a gas in a fully gaseous state is installed.

상기 복수의 실내기(50)는 냉매를 전달받아 실내공기와 열교환하는 실내열교환기(52)와, 상기 실내열교환기(52)에서 열교환이 이루어지도록 실내팬모터(56)에 의해 실내공기를 강제 송풍시키는 실내팬(54)을 포함한다.The plurality of indoor units 50 are forced to blow indoor air by an indoor heat exchanger 52 which receives refrigerant and exchanges heat with the indoor air, and an indoor fan motor 56 to perform heat exchange in the indoor heat exchanger 52. It includes an indoor fan (54).

또한, 상기 실내열교환기(52)에 연결된 배관 중에서 냉방운전 시 냉매가 흡입되는 입구측 배관에는 냉매를 팽창시키는 전자팽창밸브(58;이하 실내 전동변이라 한다)와, 실내열교환기(52)의 입구측 배관온도를 감지하는 실내열교환기 입구온도센서(62)가 설치된다.In addition, the inlet-side pipe where the refrigerant is sucked during the cooling operation among the pipes connected to the indoor heat exchanger 52 has an electromagnetic expansion valve 58 (hereinafter referred to as an indoor electric valve) for expanding the refrigerant, and An indoor heat exchanger inlet temperature sensor 62 for detecting an inlet pipe temperature is installed.

또한, 상기 실내열교환기(52)에 연결된 배관 중에서 냉방운전 시 냉매가 배출되는 출구측 배관에는 냉매 흐름을 조절하는 냉매조절밸브(60)가 설치된다.In addition, the refrigerant control valve 60 for controlling the flow of the coolant is installed in the outlet pipe from which the coolant is discharged during the cooling operation among the pipes connected to the indoor heat exchanger 52.

도 2는 본 발명의 일실시예에 의한 멀티 에어컨 시스템의 제어 구성도로서, 실외기(10)는 도 1에 도시한 장치 외에 실외기(10)의 각 장치들을 제어하는 실외기 제어부(26)를 더 포함한다.FIG. 2 is a control configuration diagram of a multi-air conditioner system according to an exemplary embodiment of the present invention. The outdoor unit 10 further includes an outdoor unit controller 26 for controlling each device of the outdoor unit 10 in addition to the device shown in FIG. 1. do.

상기 복수의 실내기(50)는 도 1에 도시한 장치 외에 각 실내기(50)로 흡입되는 실내공기온도를 감지하는 실내기 흡입온도센서(64)와, 각 실내기(50)로부터 토출되는 공기온도를 감지하는 실내기 토출온도센서(66)와, 각 실내기(50)의 장치들을 제어하는 실내기 제어부(68)를 더 포함한다.The plurality of indoor units 50, in addition to the apparatus shown in FIG. 1, the indoor unit suction temperature sensor 64 for detecting the indoor air temperature sucked into each indoor unit 50, and the air temperature discharged from each indoor unit 50 is sensed. It further comprises an indoor unit discharge temperature sensor 66, and an indoor unit controller 68 for controlling the devices of each indoor unit 50.

또한, 상기 복수의 실내기(50)에는 사용자가 실제로 느끼는 토출온도를 정확하게 표시해주는 디스플레이부(미도시)가 설치되어 있으며, 이는 기존의 실내기(50)에 설치된 것으로 구현 가능하므로 상세한 설명을 생략한다.In addition, the plurality of indoor units 50 are provided with a display unit (not shown) for accurately displaying the discharge temperature actually felt by the user, which can be implemented in the existing indoor unit 50, so a detailed description thereof will be omitted.

한편, 본 발명에서는 실외기 제어부(32)와 실내기 제어부(68)를 별도로 구성한 것을 예로 들어 설명하였으나, 시스템의 사양 또는 설계 조건에 따라 실외기 제어부(26)와 실내기 제어부(68)를 일체로 구성할 수도 있다.Meanwhile, in the present invention, the outdoor unit control unit 32 and the indoor unit control unit 68 are separately described as an example, but the outdoor unit control unit 26 and the indoor unit control unit 68 may be integrally configured according to the specifications or design conditions of the system. have.

이하, 상기와 같이 구성된 멀티 에어컨 시스템의 운전제어방법의 동작과정 및 작용효과를 설명한다.Hereinafter, an operation process and an effect of the operation control method of the multi-air conditioner system configured as described above will be described.

도 3은 본 발명에 의한 멀티 에어컨 시스템의 난방운전 제어방법의 동작 흐름도이다.3 is an operation flowchart of a heating operation control method of a multi-air conditioner system according to the present invention.

실외기(10)에 전원이 공급되면, 실외기 제어부(26)는 각 실내기 제어부(68)와 데이터 통신을 하면서 각 실내기(50)의 운전상태를 확인하여 운전 온인가를 판단한다(S100).When power is supplied to the outdoor unit 10, the outdoor unit controller 26 checks the operation state of each indoor unit 50 while performing data communication with each indoor unit control unit 68 to determine whether the operation is on (S100).

운전 온이면(YES) 멀티 에어컨 시스템이 난방운전인가를 판단하여(S110) 난방운전이면 사용자가 선택한 운전조건에 따라 압축기(12a,12b)를 구동하여 실내기(50)를 운전시킨다(S120).When the operation is on (YES), it is determined whether the multi-air conditioner system is the heating operation (S110). When the heating operation is performed, the indoor units 50 are operated by driving the compressors 12a and 12b according to the operating condition selected by the user (S120).

이때, 운전 중인 실내기(50)로 흡입되는 실내공기온도(Tin)를 실내기 흡입온도센서(64)에서 감지하고, 운전 중인 실내기(50)로부터 토출되는 공기온도(Tout)를 실내기 토출온도센서(66)에서 감지하여 실내기 제어부(68)에 입력한다(S130).At this time, the indoor air temperature (Tin) sucked into the indoor unit 50 in operation is detected by the indoor unit suction temperature sensor 64, and the air temperature (Tout) discharged from the indoor unit 50 in operation is indoor unit discharge temperature sensor (66). In step S130 is detected and input to the indoor unit controller 68.

따라서, 실내기 제어부(68)는 실내기 흡입온도센서(64)와 실내기 토출온도센서(66)로부터 입력되는 실내기 토출온도(Tout)와 실내기 흡입온도(Tin)의 온도차(Tout - Tin)를 산출하여, 산출된 온도차(Tout - Tin)가 미리 정해진 기준값(Ta;25℃, 원하는 토출온도가 나올 때의 기준온도차)보다 큰가를 판단한다(S140).Therefore, the indoor unit controller 68 calculates a temperature difference (Tout-Tin) between the indoor unit discharge temperature Tout and the indoor unit suction temperature Tin input from the indoor unit suction temperature sensor 64 and the indoor unit discharge temperature sensor 66, It is determined whether the calculated temperature difference Tout-Tin is greater than a predetermined reference value Ta (25 ° C, the reference temperature difference when the desired discharge temperature comes out) (S140).

산출된 온도차(Tout - Tin)가 기준값(Ta)보다 크지 않으면, 원하는 토출온도가 나오지 않는다고 판단하여 운전 중인 각 실내기(50)의 실내 전동변(58) 개도를 완전 개방하여 최대한 짧은 시간 내에 높은 토출온도를 유지할 수 있도록 한다(S141).If the calculated temperature difference (Tout-Tin) is not larger than the reference value Ta, it is determined that the desired discharge temperature does not come out, and the opening of the indoor electric valve 58 of each indoor unit 50 in operation is completely opened, and high discharge is performed within the shortest time. To maintain the temperature (S141).

산출된 온도차(Tout - Tin)가 기준값(Ta)보다 크면, 원하는 토출온도가 나온다고 판단하여 운전 중인 모든 실내기(50)의 실내열교환기 입구온도(Ein)를 실내열교환기 입구온도센서(62)에서 각각 감지하여 실내기 제어부(68)에 입력하고, 실내기 제어부(68)는 운전 중인 실내기(50)의 실내열교환기 입구온도센서(62)로부터 입력되는 모든 실내열교환기 입구온도(Ein)를 더한 평균값(Eavg)을 구한다(S150).If the calculated temperature difference Tout-Tin is larger than the reference value Ta, it is determined that the desired discharge temperature is obtained, and the indoor heat exchanger inlet temperature Ein of all indoor units 50 in operation is determined by the indoor heat exchanger inlet temperature sensor 62. Each sensing unit is input to the indoor unit controller 68, and the indoor unit controller 68 adds all the average values of the indoor heat exchanger inlet temperature Ein input from the indoor heat exchanger inlet temperature sensor 62 of the indoor unit 50 in operation ( Eavg) is obtained (S150).

따라서, 상기 실내기 제어부(68)는 각각의 실내열교환기 입구온도(Ein)와 구해진 평균값(Eavg)을 비교하여 실내열교환기 입구온도(Ein)와 평균값(Eavg)이 같은가를 판단한다(S160).Accordingly, the indoor unit controller 68 compares each indoor heat exchanger inlet temperature Ein with the obtained average value Eavg to determine whether the indoor heat exchanger inlet temperature Ein and the average value Eavg are the same (S160).

실내열교환기 입구온도(Ein)와 평균값(Eavg)이 같으면 해당 실내기(50)의 실내 전동변(58) 개도를 고정하고(S161), 실내열교환기 입구온도(Ein)와 평균값(Eavg)이 같지 않으면 실내열교환기 입구온도(Ein)가 평균값(Eavg)보다 작은가를 판단한다(S170).If the indoor heat exchanger inlet temperature (Ein) is equal to the average value (Eavg), the indoor electric valve 58 of the indoor unit 50 is fixed (S161), and the indoor heat exchanger inlet temperature (Ein) and the average value (Eavg) are not the same. If not, it is determined whether the indoor heat exchanger inlet temperature Ein is smaller than the average value Eavg (S170).

실내열교환기 입구온도(Ein)가 평균값(Eavg)보다 작으면 해당 실내기(50)의 실내 전동변(58) 개도를 닫아주고(S171), 실내열교환기 입구온도(Ein)가 평균값(Eavg)보다 작지 않으면 해당 실내기(50)의 실내 전동변(58) 개도를 열어주는 PID 제어로 실내열교환기 입구온도(Ein)와 평균값(Eavg)이 같아질 때까지 실내 전동변 (58)의 개도를 변경한다(S180).If the indoor heat exchanger inlet temperature (Ein) is less than the average value (Eavg), close the opening of the indoor electric valve 58 of the indoor unit 50 (S171), and the indoor heat exchanger inlet temperature (Ein) is greater than the average value (Eavg). If it is not small, change the opening degree of the indoor electric valve 58 until the indoor heat exchanger inlet temperature Ein and the average value Eavg are equal by PID control to open the indoor electric valve 58 opening degree of the indoor unit 50. (S180).

PID 제어는 피드백 제어에서 P(비례), I(적분), D(미분)의 3항 동작을 조합시켜 사용하는 제어방식으로서, 프로세스 제어에서 통상적으로 사용되는 기술이다.PID control is a control method that uses a combination of three operations of P (proportional), I (integral), and D (derivative) in feedback control, and is a technique commonly used in process control.

이와 같이, 본 발명은 실내기 흡입온도(Tin)와 실내기 토출온도(Tout)를 비교하여 원하는 토출온도가 나올 때까지 실내 전동변(58) 개도를 완전히 열어 최대한 짧은 시간 내에 높은 토출온도를 유지할 수 있도록 하면서 일정 토출온도가 되었을 때 실내열교환기 입구온도 평균값(Eavg)으로 실내 전동변(58) 개도를 PID 제어하는 냉매분배로 실내기(50)에 흐르는 냉매량을 사용자가 실제로 느끼는 실내기 토출온도에 맞게 최적으로 제어하게 된다.As such, the present invention compares the indoor unit suction temperature (Tin) and the indoor unit discharge temperature (Tout) to open the indoor electric valve 58 degree completely until the desired discharge temperature comes out so as to maintain a high discharge temperature in the shortest time possible When the discharge temperature reaches a certain discharge temperature, the average temperature of the indoor heat exchanger inlet temperature (Eavg) is used for PID control to control the opening degree of the indoor electric valve 58. The amount of refrigerant flowing through the indoor unit 50 is optimally matched to the indoor unit discharge temperature at which the user actually feels. Control.

다음에는, 냉방 시 실내 전동변(58) 개도를 제어하는 방법에 대하여 설명한다.Next, a method of controlling the opening degree of the indoor electric valve 58 during cooling will be described.

도 4는 본 발명에 의한 멀티 에어컨 시스템의 냉방운전 제어방법의 동작 흐름도이다.4 is an operation flowchart of a cooling operation control method of a multi-air conditioner system according to the present invention.

먼저, 멀티 에어컨 시스템이 냉방운전인가를 판단하여(S200) 냉방운전이면 사용자가 선택한 운전조건에 따라 압축기(12a,12b)를 구동하여 실내기(50)를 운전시킨다(S210).First, it is determined whether the multi-air conditioner system is the cooling operation (S200). If the cooling operation is performed, the indoor units 50 are operated by driving the compressors 12a and 12b according to the operating condition selected by the user (S210).

이때, 운전 중인 실내기(50)의 실내열교환기 입구온도(Ein)를 실내열교환기 입구온도센서(62)에서 감지하고, 운전 중인 실내기(50)로부터 토출되는 공기온도(Tout)를 실내기 토출온도센서(66)에서 감지하여 실내기 제어부(68)에 입력한다(S220).At this time, the indoor heat exchanger inlet temperature Ein of the indoor unit 50 in operation is detected by the indoor heat exchanger inlet temperature sensor 62, and the air temperature Tout discharged from the indoor unit 50 in operation is indoor unit discharge temperature sensor. Sensed by the 66 and input to the indoor unit controller 68 (S220).

따라서, 실내기 제어부(68)는 실내열교환기 입구온도센서(62)와 실내기 토출온도센서(66)로부터 입력되는 실내열교환기 입구온도(Ein)와 실내기 토출온도(Tout)의 온도차(Ein - Tout)를 산출하여, 산출된 온도차(Ein - Tout)가 미리 정해진 기준값(Tb;5±1℃, 과열도를 제어하기 위한 기준온도차)과 같은가를 판단한다(S230).Therefore, the indoor unit controller 68 is a temperature difference between the indoor heat exchanger inlet temperature Ein and the indoor unit discharge temperature Tout input from the indoor heat exchanger inlet temperature sensor 62 and the indoor unit discharge temperature sensor 66 (Ein-Tout). It is determined whether the calculated temperature difference (Ein-Tout) is equal to a predetermined reference value (Tb; 5 ± 1 ℃, the reference temperature difference for controlling the degree of superheat) (S230).

과열도(degree of super heating)란 포화온도 이상으로 가열된 과열증기의 온도와 그 압력에 상당하는 포화온도와의 차를 말하지만, 실제로는 측정이 용이한 실내열교환기(52)의 출구온도와 입구온도 차를 과열도로 보고 제어를 행하는 것이 일반적이며, 본 발명에서는 실내기 토출온도센서(66)와 실내열교환기 입구온도센서(62)로 각 실내열교환기(52)의 과열도를 측정하였다.The degree of super heating refers to the difference between the temperature of the superheated steam heated above the saturation temperature and the saturation temperature corresponding to the pressure, but in practice, the outlet temperature and the inlet of the indoor heat exchanger 52 are easy to measure. It is common to control by looking at the temperature difference as the superheat, and in the present invention, the superheat degree of each indoor heat exchanger 52 is measured by the indoor unit discharge temperature sensor 66 and the indoor heat exchanger inlet temperature sensor 62.

산출된 온도차(Ein - Tout)가 기준값(Tb)과 같으면 해당 실내기(50)의 실내 전동변(58) 개도를 고정한다(S240).If the calculated temperature difference Ein-Tout is equal to the reference value Tb, the opening degree of the indoor electric valve 58 of the indoor unit 50 is fixed (S240).

상기 온도차(Ein - Tout)가 기준값(Tb)과 같지 않으면, 온도차(Ein - Tout)와 기준값(Tb)을 비교하여 온도차(Ein - Tout)가 기준값(Tb)보다 작을 경우 해당 실내기(50)의 실내 전동변(58) 개도를 닫아주고, 온도차(Ein - Tout)가 기준값(Tb)보다 클 경우 해당 실내기(50)의 실내 전동변(58) 개도를 열어주는 PID 제어로 온도차(Ein - Tout)와 기준값(Tb)이 같아질 때까지 실내 전동변(58)의 개도를 변경한다(S250).If the temperature difference Ein-Tout is not equal to the reference value Tb, the temperature difference Ein-Tout is compared with the reference value Tb and the temperature difference Ein-Tout is smaller than the reference value Tb. The temperature difference (Ein-Tout) is closed by the PID control that closes the opening of the indoor electric valve (58) and opens the indoor electric valve (58) of the indoor unit (50) when the temperature difference (Ein-Tout) is greater than the reference value (Tb). The opening degree of the indoor motorized valve 58 is changed until the reference value Tb is equal to (S250).

이와 같이, 본 발명은 실내열교환기 입구온도(Ein)와 실내기 토출온도(Tout)로 과열도를 제어하는 냉매분배로 실내기(50)에 흐르는 냉매량을 사용자가 실제로 느끼는 실내기 토출온도에 맞게 최적으로 제어하게 된다.As described above, the present invention optimally controls the amount of refrigerant flowing in the indoor unit 50 according to the indoor unit discharge temperature that the user actually feels by the refrigerant distribution controlling the superheat degree by the indoor heat exchanger inlet temperature Ein and the indoor unit discharge temperature Tout. Done.

상기의 설명에서와 같이, 본 발명에 의한 멀티 에어컨 시스템의 운전제어방법에 의하면, 사용자가 실제로 느끼는 실내기 토출온도를 이용하여 운전중인 실내기의 전동변 개도를 제어함으로서 실내기에 흐르는 냉매량을 최적으로 제어할 수 있기 때문에 냉난방성능을 향상시킬 수 있다는 효과가 있다.As described above, according to the operation control method of the multi-air conditioner system according to the present invention, the amount of refrigerant flowing to the indoor unit can be optimally controlled by controlling the electric shift degree of the indoor unit in operation by using the indoor unit discharge temperature actually felt by the user. Since it is possible to improve the cooling and heating performance is effective.

상기에서 설명한 것은 본 발명에 의한 멀티 에어컨 시스템의 운전제어방법을 실시하기 위한 하나의 실시예에 불과한 것으로, 본 발명은 상술한 실시예에 한정되지 않고, 본 발명의 기술적 사상 내에서 당 분야의 통상의 지식을 가진 자에 의하여 여러 가지 변형이 가능함은 물론이다.What has been described above is only one embodiment for implementing the operation control method of the multi-air conditioner system according to the present invention, the present invention is not limited to the above-described embodiment, it is usually within the technical spirit of the present invention Of course, various modifications are possible by those who have the knowledge of.

Claims (5)

복수의 실내기와, 상기 복수의 실내기로 흐르는 냉매량을 분배제어하는 복수의 전동변을 가지는 멀티 에어컨 시스템의 제어방법에 있어서,In a control method of a multi-air conditioner system having a plurality of indoor units and a plurality of electric valves for distribution control of the amount of refrigerant flowing into the plurality of indoor units, 상기 멀티 에어컨 시스템이 난방운전인가 판단하고,It is determined whether the multi air conditioning system is heating operation, 난방운전이면 운전 중인 실내기의 흡입온도와 토출온도를 감지하여 온도차를 산출하고,In the heating operation, the temperature difference is calculated by detecting the suction temperature and the discharge temperature of the indoor unit in operation. 산출된 온도차와 미리 정해진 기준온도를 비교하여 상기 온도차가 기준온도보다 크면 운전 중인 실내기의 열교환기 입구온도를 감지하여 평균값을 계산하고,By comparing the calculated temperature difference with a predetermined reference temperature, if the temperature difference is greater than the reference temperature, the average value is calculated by detecting the heat exchanger inlet temperature of the indoor unit in operation. 계산된 평균값을 운전 중인 실내기의 열교환기 입구온도와 각각 비교하여 상기 전동변의 개도를 제어하는 것을 특징으로 하는 멀티 에어컨 시스템의 운전제어방법.And controlling the opening degree of the electric valve by comparing the calculated average value with the inlet temperature of the heat exchanger of the indoor unit in operation. 제 1항에 있어서,The method of claim 1, 상기 온도차가 기준온도보다 작으면 운전 중인 실내기의 전동변 개도를 완전 개방하여 토출온도를 제어하는 것을 특징으로 하는 멀티 에어컨 시스템의 운전제어방법.If the temperature difference is less than the reference temperature, the operation control method of the multi-air conditioning system, characterized in that to control the discharge temperature by fully opening the electric drive degree of the indoor unit in operation. 제 1항에 있어서,The method of claim 1, 상기 전동변의 개도 제어는,Opening degree control of the electric valve, 상기 열교환기 입구온도가 평균값과 같을 경우 운전 중인 실내기의 전동변 개도를 고정하고,When the heat exchanger inlet temperature is equal to the average value, the electric valve opening degree of the indoor unit in operation is fixed, 상기 열교환기 입구온도가 평균값과 같지 않을 경우 운전 중인 실내기의 전동변 개도를 개폐 제어하는 것을 특징으로 하는 멀티 에어컨 시스템의 운전제어방법.If the heat exchanger inlet temperature is not equal to the average value, the operation control method of the multi-air conditioning system, characterized in that for controlling the opening and closing of the electric valve opening of the indoor unit in operation. 복수의 실내기와, 상기 복수의 실내기로 흐르는 냉매량을 분배제어하는 복수의 전동변을 가지는 멀티 에어컨 시스템의 제어방법에 있어서,In a control method of a multi-air conditioner system having a plurality of indoor units and a plurality of electric valves for distribution control of the amount of refrigerant flowing into the plurality of indoor units, 상기 멀티 에어컨 시스템이 냉방운전인가 판단하고,It is determined whether the multi-air conditioner system is a cooling operation, 냉방운전이면 운전 중인 실내기의 열교환기 입구온도와 토출온도를 감지하여 온도차를 산출하고,In the cooling operation, the temperature difference is calculated by detecting the heat exchanger inlet temperature and the discharge temperature of the indoor unit in operation. 산출된 온도차와 미리 정해진 기준온도를 비교하여 상기 온도차가 기준온도범위를 벗어나면 상기 전동변의 개도를 제어하는 것을 특징으로 하는 멀티 에어컨 시스템의 운전제어방법.And comparing the calculated temperature difference with a predetermined reference temperature and controlling the opening degree of the electric valve if the temperature difference is out of the reference temperature range. 제 4항에 있어서,The method of claim 4, wherein 상기 전동변의 개도 제어는,Opening degree control of the electric valve, 상기 온도차가 기준온도보다 작을 경우 운전 중인 실내기의 전동변 개도를 닫아 주고,When the temperature difference is less than the reference temperature, close the electric valve opening degree of the indoor unit in operation, 상기 온도차가 기준온도보다 클 경우 운전 중인 실내기의 전동변 개도를 열 어 주는 것을 특징으로 하는 멀티 에어컨 시스템의 운전제어방법.If the temperature difference is greater than the reference temperature, the operation control method of the multi-air conditioner system, characterized in that for opening the electric valve opening degree of the indoor unit in operation.
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CN103206750A (en) * 2013-04-12 2013-07-17 浙江大学 Multi-split air conditioning system and status switching control method therefor
CN103644621A (en) * 2013-11-15 2014-03-19 浙江大学 Central arithmetic type multi-split air conditioner system and state switching control method thereof
KR101485848B1 (en) * 2008-06-25 2015-01-23 삼성전자 주식회사 Control method of multi system air conditioner
CN105485868A (en) * 2015-12-23 2016-04-13 宁波奥克斯电气股份有限公司 Reset control method of indoor unit electronic expansion valve of multi-coupled air conditioner
CN107702268A (en) * 2017-09-07 2018-02-16 广东美的暖通设备有限公司 The valve body control method and multi-connected air conditioner of multi-connected air conditioner
CN111895604A (en) * 2020-07-24 2020-11-06 海信（山东）空调有限公司 Air conditioner

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101485848B1 (en) * 2008-06-25 2015-01-23 삼성전자 주식회사 Control method of multi system air conditioner
CN103206750A (en) * 2013-04-12 2013-07-17 浙江大学 Multi-split air conditioning system and status switching control method therefor
CN103644621A (en) * 2013-11-15 2014-03-19 浙江大学 Central arithmetic type multi-split air conditioner system and state switching control method thereof
CN105485868A (en) * 2015-12-23 2016-04-13 宁波奥克斯电气股份有限公司 Reset control method of indoor unit electronic expansion valve of multi-coupled air conditioner
CN105485868B (en) * 2015-12-23 2018-05-22 宁波奥克斯电气股份有限公司 The reset control method of the interior machine electric expansion valve of multi-connected machine
CN107702268A (en) * 2017-09-07 2018-02-16 广东美的暖通设备有限公司 The valve body control method and multi-connected air conditioner of multi-connected air conditioner
CN111895604A (en) * 2020-07-24 2020-11-06 海信（山东）空调有限公司 Air conditioner
CN111895604B (en) * 2020-07-24 2021-10-22 海信（山东）空调有限公司 Air conditioner

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