WO2020235990A1 - Système et procédé pour déterminer l'état de charge du fluide frigorigène d'un climatiseur - Google Patents

Système et procédé pour déterminer l'état de charge du fluide frigorigène d'un climatiseur Download PDF

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Publication number
WO2020235990A1
WO2020235990A1 PCT/MY2020/050022 MY2020050022W WO2020235990A1 WO 2020235990 A1 WO2020235990 A1 WO 2020235990A1 MY 2020050022 W MY2020050022 W MY 2020050022W WO 2020235990 A1 WO2020235990 A1 WO 2020235990A1
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WO
WIPO (PCT)
Prior art keywords
measured
fluid property
ambient temperature
saturated fluid
charge status
Prior art date
Application number
PCT/MY2020/050022
Other languages
English (en)
Inventor
Ming Hui CHNG
Yin Hui KOK
Ching Hon LIM
Original Assignee
Daikin Research & Development Malaysia Sdn. Bhd.
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 Daikin Research & Development Malaysia Sdn. Bhd. filed Critical Daikin Research & Development Malaysia Sdn. Bhd.
Publication of WO2020235990A1 publication Critical patent/WO2020235990A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • 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
    • 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
    • F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
    • F25B2345/003—Control issues for charging or collecting refrigerant to or from a 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
    • F25B2500/19—Calculation of parameters
    • 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
    • F25B2500/23—High amount of refrigerant in the system
    • 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
    • F25B2500/24—Low amount of refrigerant in the system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/11—Fan speed control
    • F25B2600/111—Fan speed control of condenser fans
    • 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
    • F25B2600/11—Fan speed control
    • F25B2600/112—Fan speed control of evaporator fans
    • 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
    • F25B2600/2509—Economiser 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
    • F25B2700/04—Refrigerant level
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • This invention relates to a system and method for determining refrigerant charge status of an air conditioner.
  • the invention is applied for conducting commissioning process of the air conditioner.
  • Commissioning is a crucial process to assure operation requirement is met for an air conditioner. This process is needed for modelling, installation and maintenance of air conditioner.
  • One of the items required for checking during the commissioning process is the refrigerant charge status to ensure the refrigerant is within a range of factory set level that allows the air conditioner to operate at a normal state. If the refrigerant amount exceeds the factory set level range, the air conditioner is deemed overcharged. Conversely, if the refrigerant amount is less than the factory set level range, the air conditioner is considered undercharged.
  • An overcharged air conditioner results in several issues including high head pressure that affects cooling performance as well as backflow of liquid refrigerant and oil dilution that can cause component failure, especially compressor damage.
  • an undercharged air conditioner results in high superheat, low mass flow rate, low subcooling and overheating problems. The happening of high superheat causes water splitting whereas low mass flow rate is the reason for loss of cooling capacity. Noise is created by low subcooling and overheating damages components of the air conditioner.
  • subcooling or superheat measurements are applied with superheat indicating the amount of refrigerant in the evaporator and subcooling indicating the amount of refrigerant in the condenser.
  • US6571566B1 introduced a method for determining refrigerant charge level in a space temperature conditioning system. Both condenser subcooling and evaporator superheat parameters are measured for establishing a relationship with refrigerant charge level to determine an actual refrigerant charge level.
  • US5987903A discloses the use of a charge detection device for detecting a refrigerant charge in an air conditioner. The charge detection device determines difference between an actual subcooling value and a desirable sub cooling value during operation of the air conditioner. If the difference between the values is outside of an acceptable predetermined range, the air conditioner is concluded to be experiencing overcharged or undercharged problem.
  • One aspect of the present invention is to provide a system for determining refrigerant charge status of an air conditioner.
  • the system comprises a processor for executing operation of the system; and a determining module for determining the refrigerant charge status through a value obtained by comparing a measured saturated fluid property with a predicted saturated fluid property that is computed based on a measured indoor ambient temperature and a measured outdoor ambient temperature; wherein the refrigerant charge status is considered overcharged when the value exceeds a range of normal charge level, and the refrigeration charge status is considered undercharged when the value is less than the range of normal charge level.
  • the system further comprises a measuring device for obtaining the measured indoor ambient temperature, measured outdoor ambient temperature, and measured saturated fluid property.
  • the measuring device is any one or a combination of thermistor, pressure sensor, or humidity sensor.
  • the system is preferred to further comprise a database for storing a set of precomputed predicted saturated fluid property data to obtain the predicted saturated fluid property to be compared with the measured saturated fluid property.
  • the system further comprises a predicting module for computing a predicted saturated fluid property by applying the measured indoor ambient temperature and outdoor ambient temperature into a predetermined equation.
  • system further comprises an activation element for initiating process for determining the refrigerant charge status.
  • system further comprises an indicator for presenting the determined refrigerant charge status.
  • the fluid property is temperature or pressure.
  • the measured indoor ambient temperature is indoor wet bulb temperature.
  • the measured outdoor ambient temperature is preferred to be outdoor dry bulb temperature.
  • the saturated fluid property is preferred to be evaporator inlet temperature, evaporator inlet pressure, evaporator outlet pressure or suction pressure.
  • the air conditioner is an inverter air conditioner.
  • Another aspect of the present invention provides a method executed by a system having a processor for determining refrigerant charge status of an air conditioner.
  • the method comprises the step of obtaining a value through comparing a measured saturated fluid property with a predicted saturated fluid property that is computed based on a measured indoor ambient temperature and a measured outdoor ambient temperature; wherein the refrigerant charge status is determined as overcharged when the value exceeds a range of normal charge level, and the refrigeration charge status is determined as undercharged when the value is less than the range of normal charge level.
  • the method further comprises the step of maintaining any one or a combination of a compressor frequency, expansion valve opening, indoor unit fan speed and outdoor unit fan speed at a constant value when the method is conducted.
  • the measured indoor ambient temperature, measured outdoor ambient temperature and measured saturated fluid property are obtained by a measuring device.
  • the method further comprises the step of obtaining the predicted saturated fluid property from a set of precomputed predicted saturated fluid property data stored in a database prior to comparing the predicted saturated fluid property with the measured saturated fluid property.
  • the predicted saturated fluid property is preferred to be computed by applying the measured indoor ambient temperature and measured outdoor ambient temperature into a predetermined equation.
  • the fluid property is temperature or pressure.
  • the indoor ambient temperature is indoor wet bulb temperature.
  • the outdoor ambient temperature is preferred to be outdoor dry bulb temperature.
  • saturated fluid property is preferred to be evaporator inlet temperature, evaporator inlet pressure, evaporator outlet pressure or suction pressure.
  • the system is an inverter air conditioner.
  • the method further comprises the step of deactivating inverter mode of the inverter air conditioner at the start of the method.
  • the present invention provides a solution for determining refrigerant charge status of an air conditioner by the use of the system and method introduced herein during commissioning of the air conditioner.
  • the invention is targeted for determining refrigerant charge status of an inverter air conditioner that regulates temperature by varying speed of the compressor motor.
  • the system implements the method for determining refrigerant charge status that omits the need for subcooling and superheat measurements which are difficult, tedious and time consuming to be obtained.
  • complications in obtaining accurate subcooling and superheat measurements can be solved as the present invention utilizes saturated fluid property such as saturated temperature or saturated pressure for determining refrigerant charge status in replace of subcooling and superheat measurements.
  • the saturated fluid property is measured at the evaporator inlet, evaporator outlet or suction area, the measured saturated fluid property is able to provide an accurate reflection of the situation within the coils.
  • the system and method introduced herein are simple, not tedious and less time consuming while providing accurate determination of the refrigerant charge status.
  • Figure 1 shows a flowchart depicting the steps of the method executed by the system for determining refrigerant charge status.
  • the air conditioner is installed within an area that is capable of providing either or both cooling and heating mode.
  • the system and method are especially targeted for determining refrigerant charge of inverted air conditioner that changes compressor speed for regulating temperature within the area.
  • the air conditioner can be an inverter air conditioner which is usually a split air conditioner comprising an indoor unit and an outdoor unit.
  • the indoor unit is installed within the area and produces conditioned air inside the area, whereas the outdoor unit is installed outside of the area. Therefore, in this disclosure, the term‘indoor’ refers to the area subject to conditioned air, whereas the term‘outdoor’ refers to space outside of the area that is not subject to conditioned air.
  • the system comprises a processor for executing operation of the system through controlling operation of components comprised in the system.
  • the components include modules, devices, elements, database and indicator that are able to communicate with the processor for carrying out process of the method to determine the refrigerant charge status.
  • a control unit exposed at the external of the air conditioner allows user to check the refrigerant charge status.
  • the control unit can also be provided at the housing of the air conditioner, both of which are operable by the user.
  • An activation element provided by the system is available at the control unit for initiating (110) the method of the present invention to determine the refrigerant charge status, which is usually conducted during installation or maintenance of the air conditioner.
  • the activation element can be a physical button that switches on a circuit for connecting the components of the system to conduct the method, or it can be a virtual button on a display available at the control unit.
  • the system Upon initiating (110) the method through manipulating the activation element, the system enters a refrigerant charge determination mode.
  • the next step of the method is to control factors that affect heat exchanger performance. It is understood that when there is a change in refrigerant charge, the overall pressure of the air conditioner will also change. Such pressure change will reflect on the saturated temperature.
  • the present invention adopts the method in utilising indoor ambient temperature and outdoor ambient temperature as parameters to determine refrigerant charge status. Therefore, the other remaining factors need to be maintained (130) at a constant value when the method is conducted.
  • the processor deactivates (120) inverter mode of the inverter air conditioner at the start of the method, thereby turning the air conditioner into a non-inverter air conditioner whereby the speed of the air conditioner compressor remains constant and does not vary for regulating temperature.
  • measurement of the indoor ambient temperature and outdoor ambient temperature are obtained (140) using measuring devices of the system such as thermistor or humidity sensor.
  • the indoor ambient temperature is indoor wet bulb temperature that can be measured by a humidity sensor.
  • the outdoor ambient temperature is outdoor dry bulb temperature that can be measured by a thermistor.
  • measurement of a saturated fluid property being a saturated temperature or saturated pressure is obtained (140) as the present invention determines refrigerant charge status based on saturated fluid property.
  • the term‘fluid property’ includes temperature and pressure.
  • the saturated fluid property can be measured at the evaporator inlet, evaporator outlet or suction area of the air conditioner through the use of measuring device such as thermistor or pressure sensor. Therefore, the saturated temperature can be the evaporator inlet temperature, whereas the saturated pressure can be the evaporator inlet pressure, evaporator outlet pressure or suction pressure.
  • Measurements of the indoor ambient temperature being the measured indoor wet bulb temperature, and the outdoor ambient temperature being the measured outdoor dry bulb temperature are then sent to a predicting module of the system for computing a predicted saturated fluid property by applying the measured indoor ambient temperature and outdoor ambient temperature into a predetermined equation.
  • a set of precomputed predicted saturated fluid property data can be stored in a database of the system.
  • the set of precomputed predicted saturated fluid property data are computed based on a range of temperature or pressure such that when the predicting module receives information of the measured indoor ambient temperature and the measured outdoor ambient temperature, the predicted saturated fluid property can be timely obtained (150) through retrieving the measurement from the precomputed predicted saturated fluid property data.
  • Information of the predicted saturated fluid property is then sent to a determining module for determining the refrigerant charge status through a value obtained (160) by comparing the measured saturated fluid property with the predicted saturated fluid property. If the value falls within a range of factory set level that defines a normal charge level, the refrigerant charge status is deemed good. However, if the value exceeds a range of normal charge level, the refrigerant charge status is considered overcharged, whereas if the value is less than the range of normal charge level, the refrigerant charge status is considered undercharged. Both overcharged and undercharged indicate abnormal refrigerant levels, and thus action needs to be taken to rectify the refrigerant charge level.
  • the tolerance for the value for saturated temperature is ⁇ 1°C
  • the tolerance for the value for saturated pressure is ⁇ 5 psi that is approximately equal to ⁇ 6895 N/m.
  • the refrigerant charge status is deemed within the range of normal charge level.
  • the measured saturated fluid property is pressure and the predicted saturated fluid property is temperature
  • the measured saturated pressure can be converted to temperature to be compared with the predicted saturated temperature.
  • the predicted saturated temperature can be converted to pressure to be compared with the measured saturated pressure.
  • the measured saturated fluid property is temperature and the predicted saturated fluid property is pressure
  • the measured saturated temperature can be converted to pressure to be compared with the predicted saturated pressure.
  • the predicted saturated pressure can be converted to temperature for comparing with the measured saturated temperature.
  • the measured indoor ambient temperature and measured outdoor ambient temperature can be converted to pressure for obtaining the predicted saturated pressure from the precomputed predicted saturated pressure data.
  • the system provides an indication of the outcome through an indicator.
  • the indicator presents (170) the determined refrigerant charge status in a form visually and/or audibly noticeable by the user of the system.
  • the indicator is an LED light having blinking patterns to indicate the determined refrigerant charge status.
  • the indicator can be presented on a display at the control unit.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

La présente invention concerne un système pour déterminer l'état de charge du fluide frigorigène d'un climatiseur qui comprend un processeur pour exécuter le fonctionnement du système ; et un module de détermination pour déterminer l'état de charge du fluide frigorigène grâce à une valeur obtenue en comparant une propriété de fluide saturé mesurée avec une propriété de fluide saturé prédite qui est calculée sur la base d'une température ambiante intérieure mesurée et d'une température ambiante extérieure mesurée ; l'état de charge du fluide frigorigène étant considéré comme en surcharge lorsque la valeur dépasse une plage de niveau de charge normale, et l'état de charge du fluide frigorigène est considéré en sous-charge lorsque la valeur est inférieure à la plage de niveau de charge normale.
PCT/MY2020/050022 2019-05-23 2020-04-14 Système et procédé pour déterminer l'état de charge du fluide frigorigène d'un climatiseur WO2020235990A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MYPI2019002891A MY197892A (en) 2019-05-23 2019-05-23 System and method for determining refrigerant charge status of an air conditioner
MYPI2019002891 2019-05-23

Publications (1)

Publication Number Publication Date
WO2020235990A1 true WO2020235990A1 (fr) 2020-11-26

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WO (1) WO2020235990A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114251883A (zh) * 2021-12-21 2022-03-29 宁波奥克斯电气股份有限公司 一种空调加氟控制方法、装置及空调器
CN114413410A (zh) * 2022-03-11 2022-04-29 青岛海信日立空调系统有限公司 多联机系统制冷剂充注不当容错控制方法及多联机系统
CN115930397A (zh) * 2022-11-21 2023-04-07 珠海格力电器股份有限公司 一种制冷剂回收控制方法、装置及空调

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US20060137366A1 (en) * 2004-12-27 2006-06-29 Carrier Corporation Automatic refrigerant charging apparatus
CN106016867A (zh) * 2016-04-28 2016-10-12 广东美的暖通设备有限公司 一种冷媒充注方法、冷媒充注系统及空调器
CN107975988A (zh) * 2017-11-13 2018-05-01 广东美的暖通设备有限公司 冷媒充注量检测方法、装置及热泵空调系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010076425A (ko) * 2000-01-21 2001-08-16 구자홍 인버터 공기조화기의 냉매봉입량조절방법
US20060137366A1 (en) * 2004-12-27 2006-06-29 Carrier Corporation Automatic refrigerant charging apparatus
CN106016867A (zh) * 2016-04-28 2016-10-12 广东美的暖通设备有限公司 一种冷媒充注方法、冷媒充注系统及空调器
CN107975988A (zh) * 2017-11-13 2018-05-01 广东美的暖通设备有限公司 冷媒充注量检测方法、装置及热泵空调系统

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114251883A (zh) * 2021-12-21 2022-03-29 宁波奥克斯电气股份有限公司 一种空调加氟控制方法、装置及空调器
CN114251883B (zh) * 2021-12-21 2023-08-18 宁波奥克斯电气股份有限公司 一种空调加氟控制方法、装置及空调器
CN114413410A (zh) * 2022-03-11 2022-04-29 青岛海信日立空调系统有限公司 多联机系统制冷剂充注不当容错控制方法及多联机系统
CN115930397A (zh) * 2022-11-21 2023-04-07 珠海格力电器股份有限公司 一种制冷剂回收控制方法、装置及空调

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