WO2018156720A1 - Systèmes et procédés de climatisation répartie avec protection répartie contre la perte de fluide frigorigène - Google Patents

Systèmes et procédés de climatisation répartie avec protection répartie contre la perte de fluide frigorigène Download PDF

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Publication number
WO2018156720A1
WO2018156720A1 PCT/US2018/019161 US2018019161W WO2018156720A1 WO 2018156720 A1 WO2018156720 A1 WO 2018156720A1 US 2018019161 W US2018019161 W US 2018019161W WO 2018156720 A1 WO2018156720 A1 WO 2018156720A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
evaporator
cutoff valves
ambient
evaporators
Prior art date
Application number
PCT/US2018/019161
Other languages
English (en)
Inventor
Kenneth R. Green
Douglas H. Morse
Original Assignee
GREEN, Elda D.
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 GREEN, Elda D. filed Critical GREEN, Elda D.
Publication of WO2018156720A1 publication Critical patent/WO2018156720A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
    • 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
    • F24F11/89—Arrangement or mounting of control or 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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/005—Arrangement or mounting of control or safety devices of safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • 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
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/12—Inflammable refrigerants
    • 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
    • F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
    • 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
    • F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
    • F25B2500/222—Detecting refrigerant leaks
    • 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
    • F25B2700/13—Mass flow of refrigerants
    • F25B2700/135—Mass flow of refrigerants through the evaporator
    • F25B2700/1352—Mass flow of refrigerants through the evaporator at the inlet

Definitions

  • the present application relates to distributed climate control systems, especially those which supply a condensed phase-change refrigerant compound to multiple evaporators in the same fluid system.
  • Each cooling unit includes its own evaporator.
  • a central condenser supplies liquid refrigerant - e.g. a halocarbon or other phase-change refrigerant - to all of the evaporators in a group.
  • the group might include a few guest rooms, or all guest rooms on one floor of the hotel, or all guest rooms on multiple floors of the hotel.
  • the evaporators if one of the evaporators begins to leak, the whole system's refrigerant can potentially escape. If one of the evaporators suffers a catastrophic failure, all of the refrigerant in the system can potentially be discharged into one room. With conventional Freon-type refrigerants, this risks displacement of the oxygen, and hence poses a suffocation hazard. If flammable or toxic refrigerants are used, the safety hazard is increased.
  • VRF Variable Refrigerant Flow
  • HVAC heating, ventilation, and air conditioning
  • a VRF system has a catastrophic failure and loses all of its charge, all of the areas that are connected to that outdoor condenser will fail because the VRF system has lost the refrigerant charge and will be down until the faulty coil is repaired.
  • a hotel room has a VRF system that sustains a catastrophic failure and all 19 rooms on the fourth floor of a hotel are affected.
  • the impacts of this catastrophic failure are a comfort issue, cost issue, and a safety/health issue because the hotel is down due to a refrigerant leak. It is critical for a contractor to find leaks when they are small before there is a catastrophic leak into a room where somebody could be fatally affected due to oxygen being displaced in the room. When 100 pounds of refrigerant is dumped into a single room, the oxygen in that room will be displaced and the refrigerant will inundate not only that room but the hallway outside of that room as well.
  • Leak detectors and sensors are available for many common refrigerants.
  • the actual refrigerant species is known, so it is not necessary to distinguish between that and similar species.
  • One common technology is infrared absorption, where absorptions of specific wavelengths will be strongly affected by threshold concentrations of the refrigerant sought to be detected. This currently appears to be the most attractive technology for cheap durable installed leak detectors and sensors.
  • many other technologies are possible, such as diode detectors and sensors, chemFETs, and FTIR.
  • the present application teaches, among other innovations, Distributed climate-Control Systems in which one condenser (or multiple condensers) serves multiple evaporators (typically in multiple air handlers).
  • Each air handler includes a refrigerant leak sensor plus cutoff valves which are automatically operated to isolate an evaporator from the refrigerant lines when some value of ambient refrigerant (leakage) is detected. This provides an early-warning system to isolate leakage problems and also launch an appropriate maintenance response.
  • the present application also teaches, among other innovations, methods for operation of a distributed climate-control system with distributed leak detection and response capabilities.
  • Figure 1 schematically shows a complete distributed climate-control system.
  • Figure 2 shows an example of a complete modular air handler unit which incorporates the above innovate teachings.
  • Figures 3A and 3B shows two examples of control modules which operate an air handler like that of Figure 2, within a system like that of Figure 1.
  • Figure 4 shows an example of a condenser which is connected to multiple evaporators through one EEV and one solenoid valve at each evaporator.
  • Figure 5 shows an example of a condenser which is connected to multiple evaporators through two solenoid valves at each evaporator.
  • Figures 6, 7, and 8 show more details of a single room unit, in three alternative implementations.
  • Figure 9 shows an example of a multizone heat recovery system.
  • Figure 10 shows an exemplary control module like those of
  • FIGS 3A and 3B using EEV and/or LEV.
  • Figures 11A and 11B show sample sensor configurations corresponding to Figures 3 A and 10, respectively.
  • the present application discloses new approaches to configuration and control of distributed climate-control systems which include multiple separate evaporators. An important component of these systems is distributed leak detection.
  • FIG. 1 schematically shows a system 0200 which includes a central condenser unit (outside heat exchanger OHE 0210) in combination with one inside heat exchanger (IHE 0220) of the distributed network 0200 of air handling units.
  • Each of the air handlers includes an evaporator, in which condensed refrigerant can undergo a phase change while absorbing heat of vaporization, and incorporates heat exchanger EEX 0222 (e.g. a coil) which permits the heat absorption of the evaporator to be coupled to a forced airflow path.
  • heat exchanger EEX 0222 e.g. a coil
  • the evaporator includes a metering device 0221, shown here as an evaporator expansion valve (EEV), to provide variable flow of refrigerant, and hence a variable rate of heat transfer.
  • EEV evaporator expansion valve
  • the individual ones of the evaporators also include additional unconventional elements.
  • sensor HRS 0224 to detect ambient levels of the refrigerant is included;
  • electrically operable cutoff valving 0231+0241 (RRV+RSV) is used to permit the evaporator to be isolated from both the liquid-phase and the gas-phase refrigerant flows;
  • third, local control logic (shown below) is preferably included with each of the evaporator units 0220, and is preferably programmed to shut the cutoff valves 0231+0241 whenever an ambient refrigerant concentration is found to exceed a tolerable level.
  • the tolerable level may be zero, or may be slightly higher in some cases.
  • Figures 4 and 5 show two exemplary condenser configurations.
  • the condenser is connected to multiple evaporators through one EEV and one solenoid valve at each evaporator.
  • the exemplary condenser of Figure 5 shows a condenser which is connected to multiple evaporators through two solenoid valves at each evaporator.
  • the exemplary single room unit of Figure 6 uses metering EEVs or LEVs between the gas pipe and gas pipe thermistor TH23, and between the liquid pipe and liquid pipe thermistor TH22.
  • the exemplary single room unit of Figure 7 uses solenoid valves where Figure 6 uses EEVs or LEVs.
  • either a solenoid or a metering device, but not both, is used between the gas pipe and gas pipe thermistor TH23, and no supplemental solenoid or metering device is used adjacent to the liquid pipe in place of the solenoid on Figure 7's liquid pipe.
  • EEVs and LEVs are typically used as 100% shutoff valves.
  • the linear expansion valve connected immediately adjacent to liquid pipe thermistor TH22, on the pipe side is preferably a manufacturer-installed metering device.
  • This LEV can be programmed through software to add a sensor to detect refrigerant leaks, and this programmable LEV can operate as a shut valve or as a metering device.
  • Figure 2 shows an example of a complete modular air handler unit which incorporates the above innovative teachings. Note that a sensor for ambient gaseous refrigerant is included.
  • Figures 3A and 3B show two examples of control modules which operate an air handler like that of Figure 2, within a system like that of Figure 1. Note that an electronic latching relation is preferably included, so that when the shutoff valve(s) have been activated, they cannot be accidentally inactivated.
  • Figure 10 show an exemplary control module similar to that of
  • FIGS 3A and 3B in which EEVs and/or LEVs are used instead of the solenoid valves of Figures 3 A and 3B.
  • Figures 11A and 11B show examples of sensor pin configurations corresponding to Figures 3 A and 10, respectively.
  • the threshold value may be set to zero, so that any nonzero value will cause the cutoff valves to be operated. However, if the cutoff threshold value is set to be greater than zero, it may also be possible to set a lower value which will trigger a preliminary report. These preliminary reports can be useful for maintenance alerts, while not necessarily requiring drastic action.
  • the simplest operation is to allow the local control logic (at the air handler) to activate the cutoff valves automatically, whenever an increased level of refrigerant is detected in the ambient, without any higher-level input.
  • a secondary benefit of the localized leak detection is that human operators, and higher-level monitoring and control systems, now have access to a distributed network of leak detection sensors. This can be used to perform functions in addition to simple cutoff of a leaking coil. For instance, if the cutoff valves have been activated and refrigerant is still detected (after a few minutes), then not all leak sources have been isolated. In this case a further alarm condition can be triggered, to require, e.g., isolation of a section containing multiple air handlers.
  • any trace of ambient refrigerant should trigger shutdown.
  • the refrigerant is benign enough to allow a nonzero tolerable concentration, and the leak sensor is sensitive enough to detect ambient refrigerant levels below the tolerable concentration, it may be preferable to trigger shutdown only when the non-zero tolerable concentration has been detected.
  • Audible alarms and/or flashing lights can also be used to alert the teacher or other responsible personnel when there is a danger of refrigerant leakage.
  • Airflow isolation here can increase security against smoke and gas diffusion. Moreover, distributed climate control can help to provide additional support for blast isolation and intrusion barriers.
  • a further secondary benefit, unique to this class of applications, is survival of some evaporators when others have been compromised.
  • an air handler When an air handler is not within the close defense perimeter, its shutoff valves can be activated to improve the chances that catastrophic refrigerant loss will not occur.
  • a multi-location climate control system comprising: a condenser, which receives evaporated refrigerant from a refrigerant return connection, and condenses the evaporated refrigerant to a liquid flow of condensed refrigerant which is supplied to a refrigerant supply connection; and multiple air handler units in multiple locations, individually including an evaporator which is connected, through respective cutoff valves, to be supplied with condensed refrigerant and to discharge evaporated refrigerant, and a heat exchanger which thermally couples the heat absorption of the evaporator to a forced airflow path, and a refrigerant leak sensor which detects escaped refrigerant in the ambient air, and which is local to that air handler unit; and control logic which, under at least some circumstances, automatically activates the cutoff valve to cut off flow of condensed refrigerant into the respective evaporator, in dependence on the output of the leak sensor.
  • a multi-location climate control system comprising: a condenser, which receives evaporated refrigerant from a refrigerant return connection, and condenses the evaporated refrigerant to a liquid flow of condensed refrigerant which is supplied to a refrigerant supply connection; and multiple air handler units in multiple locations, individually including an evaporator which is connected, through respective cutoff valves, to be supplied with condensed refrigerant and to discharge evaporated refrigerant, and a respective metering device which regulates flow of refrigerant through that evaporator, and a heat exchanger coil which thermally couples the heat absorption of the evaporator to a forced airflow path, and a refrigerant leak sensor which detects escaped refrigerant in the ambient air, and which is local to that air handler unit; and local control logic which, under at least some circumstances, automatically activates the cutoff valve to cut off flow of condensed ref
  • a multi-location cooling system comprising: multiple evaporators in multiple locations, ones of said evaporators being connected, through respective cutoff valves, to be supplied with refrigerant therethrough, and each respectively including a respective metering device which regulates flow of refrigerant through that evaporator, and each thermally coupled through a heat exchanger to a respective airflow path, and multiple refrigerant leak sensors, in multiple respective ones of the multiple locations; and control logic which, under at least some circumstances, automatically activates the cutoff valve for one of the evaporators when excess ambient refrigerant is detected by a corresponding one of the leak sensors.
  • a multi-location cooling system comprising multiple evaporators in multiple locations, ones of said evaporators being connected, through respective cutoff valves, to be supplied with refrigerant therethrough, and each respectively including a respective metering device which regulates flow of refrigerant through that evaporator, and each thermally coupled through a heat exchanger [coil] to a respective airflow path, and multiple refrigerant leak sensors, in multiple respective ones of the multiple locations; and control logic local to each location which contains a respective one of the evaporators which, under at least some circumstances, automatically activates the cutoff valve for one of the evaporators when excess ambient refrigerant is detected by a corresponding one of the leak sensors.
  • An air handler module comprising: an evaporator, having a metering device which regulates flow of refrigerant through the evaporator, first and second refrigerant connections which connect the evaporator to receive a liquid flow of condensed refrigerant from a refrigerant supply connection and to supply evaporated refrigerant to a refrigerant return connection, one or more cutoff valves which, when activated, cut off the flow of refrigerant through the evaporator, and a heat exchanger which thermally couples the heat absorption of the evaporator to a forced airflow path; a refrigerant leak sensor which detects escaped refrigerant in the ambient air; and control logic which, when the refrigerant leak sensor detects an ambient refrigerant concentration above a minimum, automatically shuts the cutoff valves.
  • a multi-location climate control system comprising: a condenser, which receives evaporated refrigerant from a refrigerant return connection, and condenses the evaporated refrigerant to a liquid flow of condensed refrigerant which is supplied to a refrigerant supply connection; and multiple air handler units in multiple locations, individually including an evaporator which is connected, through respective cutoff valves, to be supplied with condensed refrigerant and to discharge evaporated refrigerant, and a heat exchanger which thermally couples the heat absorption of the evaporator to a forced airflow path, and a refrigerant leak detector which detects escaped refrigerant in the ambient air, and which is local to that air handler unit; and control logic which, under at least some circumstances, automatically activates the cutoff valve to cut off flow of condensed refrigerant into the respective evaporator, in dependence on the output of the leak detector.
  • the system includes a central condenser unit in combination with a distributed network of air handling units.
  • Each of the air handlers includes an evaporator, in which condensed refrigerant can undergo a phase change while absorbing heat of vaporization, plus a heat exchanger (e.g. a coil) which permits the heat absorption of the evaporator to be coupled to a forced airflow.
  • a heat exchanger e.g. a coil
  • the evaporator includes a metering device to provide variable flow of refrigerant, and hence variable rates of heat transfer.
  • the individual evaporators also include a sensor to detect ambient levels of the refrigerant, electrically operable cutoff valves which permit the evaporator to be isolated from both the liquid-phase and the gas-phase refrigerant flows.
  • Local control logic is preferably connected to shut the cutoff valves whenever an ambient refrigerant concentration is found to exceed a tolerable level.
  • a mechanical and/or electronic latch can be incorporated with the cutoff valves, to provide additional safety in case of a gross malfunction in the high-level system controls.
  • the condenser unit which is connected to supply a group of evaporator units may itself be a heat recovery unit, i.e. one which can provide bidirectional condensation between two refrigerant lines which are both capable of carrying liquid OR vapor.
  • a heat recovery unit i.e. one which can provide bidirectional condensation between two refrigerant lines which are both capable of carrying liquid OR vapor.
  • the condenser can be a heat pump, and the evaporators can be reversibly operable as heat pumps.
  • one or more sensors can be detectors.
  • detectors are typically used to detect whether or not a nonzero concentration is present, while sensors are typically used to determine the particular concentration. For example, where a detector might only report that some contaminant is present, a sensor might report that the concentration of the contaminant is 3 ppm.
  • some of the disclosed inventions can be included in a retrofitting kit, which permits cutoff valves, a leak sensor, and simple local control logic to be plumbed into the refrigerant connections of each evaporator in an existing multi-evaporator system.
  • an operator may be given the capability to remotely override the automatic shutdown. Depending on the safety constraints of the particular refrigerant and the particular situation, it may sometimes be necessary to allow the operator to force a leaky unit to continue operation as an emergency or temporizing measure.
  • valves can optionally be implemented as EEV or LEV (linear expansion valve). This can be done in several ways:
  • the EEV or LEV valves can simply replace the solenoid valves in the above configurations.
  • a manufacturer can include an LEV in the air handler, with programming so that the LEV operates as a shutoff valve when refrigerant is sensed in the ambient air.
  • an air handler can be installed, along with just one LEV/EE V/solenoid valve, to provide a quick installation which implements the inventive principals above.
  • a system can be implemented with combinations of EEV/LEV and solenoid valves.

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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

Systèmes et procédés de climatisation répartie avec protection répartie contre la perte de fluide frigorigène: le système comprend une unité de condenseur central en combinaison avec un réseau réparti d'unités de traitement d'air. Chaque unité de traitement d'air comprend un évaporateur, dans lequel du fluide frigorigène condensé peut subir un changement de phase tout en absorbant une chaleur de vaporisation, ainsi qu'un échangeur de chaleur (p. ex. un serpentin) qui permet à l'absorption de chaleur de l'évaporateur d'être couplée à un écoulement d'air forcé. De préférence, l'évaporateur comprend un dispositif de dosage pour assurer un débit variable de fluide frigorigène, et donc des taux variables de transfert de chaleur. Les évaporateurs individuels comprennent également un capteur servant à détecter des niveaux ambiants du fluide frigorigène, des vannes de coupure commandables électriquement qui permettent à l'évaporateur d'être isolé à la fois des écoulements de fluide frigorigène en phase liquide et en phase gazeuse. Une logique de commande locale est de préférence raccordée pour fermer les vannes de coupure chaque fois qu'il est constaté qu'une concentration ambiante de fluide frigorigène dépasse un niveau admissible.
PCT/US2018/019161 2017-02-23 2018-02-22 Systèmes et procédés de climatisation répartie avec protection répartie contre la perte de fluide frigorigène WO2018156720A1 (fr)

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US201762462570P 2017-02-23 2017-02-23
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CN110940045A (zh) * 2018-09-21 2020-03-31 奥克斯空调股份有限公司 一种空调冷媒泄露的检测方法及空调器
CN110940043A (zh) * 2018-09-21 2020-03-31 奥克斯空调股份有限公司 一种空调冷媒泄漏检测方法及空调器
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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