CA2211853A1 - Control apparatus for space cooling system - Google Patents
Control apparatus for space cooling systemInfo
- Publication number
- CA2211853A1 CA2211853A1 CA002211853A CA2211853A CA2211853A1 CA 2211853 A1 CA2211853 A1 CA 2211853A1 CA 002211853 A CA002211853 A CA 002211853A CA 2211853 A CA2211853 A CA 2211853A CA 2211853 A1 CA2211853 A1 CA 2211853A1
- Authority
- CA
- Canada
- Prior art keywords
- cooling system
- temperature
- compressor discharge
- space
- temperature sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
- F24F11/38—Failure diagnosis
-
- 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
- F24F11/41—Defrosting; Preventing freezing
- F24F11/43—Defrosting; Preventing freezing of indoor units
-
- 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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
- F24F11/526—Indication arrangements, e.g. displays giving audible indications
-
- 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F24F11/41—Defrosting; Preventing freezing
-
- 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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
-
- 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
- F25B2600/21—Refrigerant outlet evaporator temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/385—Dispositions with two or more expansion means arranged in parallel on a refrigerant line leading to the same evaporator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/027—Condenser control 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
-
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S62/00—Refrigeration
- Y10S62/17—Condenser pressure control
Abstract
Apparatus for providing integrated control of a space cooling system (20) is disclosed. The apparatus receives inputs from a plurality of temperature sensors, including a temperature sensor for mesuring evaporator superheat (29, 28), space temperature (31) and compressor discharge temperature (30). The control apparatus incrementally adjusts the position of the cooling system expansion valve (24) to regulate evaporator superheat and compressor discharge temperature and cycles the outdoor condenser fan (27) on and off to raise condenser pressure in response to a low condenser pressure condition. In one embodiment, the cooling system includes a plurality of evaporators (21) and a corresponding plurality of controllers (25) electrically interconnected in a series loop for controlling the expansion valves (24) and defrost heaters (34) associated with the respective evaporators (21). One of the controllers functions as a master controller and receives inputs from the space temperature sensor (31) and the compressor discharge temperature sensor (30) as well as from the temperature sensors (28, 33, 29) associated with the corresponding evaporator (21).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/383,250 US5551248A (en) | 1995-02-03 | 1995-02-03 | Control apparatus for space cooling system |
US08/383,250 | 1995-02-03 | ||
PCT/US1996/001398 WO1996024016A1 (en) | 1995-02-03 | 1996-01-31 | Control apparatus for space cooling system |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2211853A1 true CA2211853A1 (en) | 1996-08-08 |
CA2211853C CA2211853C (en) | 2006-05-02 |
Family
ID=23512321
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002211853A Expired - Lifetime CA2211853C (en) | 1995-02-03 | 1996-01-31 | Control apparatus for space cooling system |
Country Status (6)
Country | Link |
---|---|
US (1) | US5551248A (en) |
EP (1) | EP0809773A1 (en) |
AU (1) | AU4970896A (en) |
CA (1) | CA2211853C (en) |
MX (1) | MX9705885A (en) |
WO (1) | WO1996024016A1 (en) |
Families Citing this family (46)
Publication number | Priority date | Publication date | Assignee | Title |
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GB2314915B (en) * | 1996-07-05 | 2000-01-26 | Jtl Systems Ltd | Defrost control method and apparatus |
US5950439A (en) * | 1997-01-21 | 1999-09-14 | Nartron Corporation | Methods and systems for controlling a refrigeration system |
ATE222344T1 (en) | 1997-03-18 | 2002-08-15 | Andreas Bangheri | COMPRESSION HEAT PUMP OR COMPRESSION REFRIGERATOR AND CONTROL METHOD THEREOF |
US5970726A (en) | 1997-04-08 | 1999-10-26 | Heatcraft Inc. | Defrost control for space cooling system |
WO1999000631A1 (en) * | 1997-06-28 | 1999-01-07 | Daewoo Electronics Co., Ltd. | Apparatus and method for preventing an evaporator for an air-conditioning system from freezing |
DE19846026A1 (en) * | 1998-10-06 | 2000-04-13 | Behr Gmbh & Co | Control device for an air conditioning refrigerant circuit |
KR100333395B1 (en) * | 1999-06-28 | 2002-04-24 | 윤종용 | low-temperature control operation method of multitude-type air conditioner |
JP2001050599A (en) * | 1999-07-28 | 2001-02-23 | Johnson Controls Technol Co | Equipment and method for high-function control of air- cooled condenser based on fan speed |
JP2002350014A (en) * | 2001-05-22 | 2002-12-04 | Daikin Ind Ltd | Refrigerating equipment |
US7127901B2 (en) * | 2001-07-20 | 2006-10-31 | Brooks Automation, Inc. | Helium management control system |
US6692518B2 (en) * | 2002-02-27 | 2004-02-17 | Medivance Incorporated | Patient temperature control system |
US20040244393A1 (en) * | 2003-04-18 | 2004-12-09 | Ingersoll-Rand Company | Variable speed compressor cooling system |
US7290402B1 (en) * | 2003-12-29 | 2007-11-06 | Heatcraft Refrigeration Products Llc | Expansion valve control system and method and refrigeration unit employing the same |
US7191604B1 (en) * | 2004-02-26 | 2007-03-20 | Earth To Air Systems, Llc | Heat pump dehumidification system |
CN100453922C (en) * | 2004-04-09 | 2009-01-21 | 松下电器产业株式会社 | Drying equipment |
US6945059B1 (en) * | 2004-09-08 | 2005-09-20 | Carrier Corporation | Refrigerant cycle with defrost termination control |
KR100758902B1 (en) * | 2004-11-23 | 2007-09-14 | 엘지전자 주식회사 | multi type air conditioning system and controlling method of the system |
US7275376B2 (en) * | 2005-04-28 | 2007-10-02 | Dover Systems, Inc. | Defrost system for a refrigeration device |
KR101199382B1 (en) * | 2006-02-17 | 2012-11-09 | 엘지전자 주식회사 | Air-conditioner and Controlling Method for the same |
KR100712192B1 (en) * | 2006-05-12 | 2007-04-27 | 충주대학교 산학협력단 | Multi type air conditioner having cooling and heating function |
KR100846113B1 (en) * | 2007-03-29 | 2008-07-15 | 엘지전자 주식회사 | Control method of the refrigerator |
US20110209485A1 (en) * | 2007-10-10 | 2011-09-01 | Alexander Lifson | Suction superheat conrol based on refrigerant condition at discharge |
US8156750B2 (en) * | 2008-07-29 | 2012-04-17 | Agri Control Technologies, Inc. | Dynamic superheat control for high efficiency refrigeration system |
JP4497234B2 (en) * | 2008-07-29 | 2010-07-07 | ダイキン工業株式会社 | Air conditioner |
US9238398B2 (en) * | 2008-09-25 | 2016-01-19 | B/E Aerospace, Inc. | Refrigeration systems and methods for connection with a vehicle's liquid cooling system |
US8800309B2 (en) * | 2009-12-14 | 2014-08-12 | Schneider Electric USA, Inc. | Method of automatically detecting an anomalous condition relative to a nominal operating condition in a vapor compression system |
US20120060525A1 (en) * | 2010-11-30 | 2012-03-15 | General Electric Company | Apparatus and method for monitoring super-heating of refrigerant to improve compressor efficiency and lower energy usage |
US8567208B2 (en) * | 2011-07-16 | 2013-10-29 | Alexander Fain | Water chiller |
CN103998878A (en) * | 2011-12-02 | 2014-08-20 | 韦尔比尔特冰柜基赛尔面板系统有限公司 | Refrigeration apparatus and method |
JP5447499B2 (en) * | 2011-12-28 | 2014-03-19 | ダイキン工業株式会社 | Refrigeration equipment |
KR101918224B1 (en) * | 2012-01-31 | 2018-11-13 | 엘지전자 주식회사 | Refrigerator and Control method of the same |
US10077929B2 (en) * | 2013-05-08 | 2018-09-18 | Carrier Corporation | Movement of electronic expansion valve |
CN103673138B (en) * | 2013-12-27 | 2016-09-21 | Tcl空调器(中山)有限公司 | Air-conditioner and control method thereof |
EP3332181B1 (en) * | 2015-08-03 | 2021-09-29 | Carrier Corporation | Refrigeration system and operating method |
US10260788B2 (en) * | 2015-08-07 | 2019-04-16 | Carrier Corporation | System and method for controlling an electronic expansion valve |
US9933181B2 (en) | 2016-02-04 | 2018-04-03 | Lennox Industries LLC | Method of and system for minimization of condenser-fan cycling for low ambient temperature |
JP6559361B2 (en) * | 2016-09-06 | 2019-08-14 | 三菱電機株式会社 | Refrigeration cycle equipment |
ES2886912T3 (en) * | 2017-11-22 | 2021-12-21 | Mitsubishi Electric Corp | Air conditioner |
US10809707B2 (en) | 2018-02-22 | 2020-10-20 | Schneider Electric USA, Inc. | Detection of efficiency degradation in HVAC and R systems |
US10488099B2 (en) | 2018-02-22 | 2019-11-26 | Schneider Electric USA, Inc. | Frost detection in HVACandR systems |
CN109114748A (en) * | 2018-08-20 | 2019-01-01 | 宁波奥克斯电气股份有限公司 | A kind of air-conditioning delays frosting control method, device and air conditioner |
US10982887B2 (en) * | 2018-11-20 | 2021-04-20 | Rheem Manufacturing Company | Expansion valve with selectable operation modes |
KR20200062698A (en) * | 2018-11-27 | 2020-06-04 | 엘지전자 주식회사 | Refrigerator and method for controlling the same |
CN116981895A (en) | 2021-01-21 | 2023-10-31 | 伊凡尼·安东尼奥·戈比 | Digital refrigeration controller with integrated module driven electronic expansion valve |
CN113883654B (en) * | 2021-11-11 | 2022-10-28 | 宁波奥克斯电气股份有限公司 | Control method of air conditioner, air conditioner and computer readable storage medium |
US11892181B2 (en) * | 2022-02-17 | 2024-02-06 | Goodman Manufacturing Company, L.P. | HVAC system with integrated supply of outdoor air |
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US4067203A (en) * | 1976-09-07 | 1978-01-10 | Emerson Electric Co. | Control system for maximizing the efficiency of an evaporator coil |
US4523435A (en) * | 1983-12-19 | 1985-06-18 | Carrier Corporation | Method and apparatus for controlling a refrigerant expansion valve in a refrigeration system |
JPS60140075A (en) * | 1983-12-28 | 1985-07-24 | 株式会社東芝 | Method of controlling refrigeration cycle |
JPS6136671A (en) * | 1984-07-26 | 1986-02-21 | 三洋電機株式会社 | Controller for flow rate of refrigerant |
US5035119A (en) * | 1984-08-08 | 1991-07-30 | Alsenz Richard H | Apparatus for monitoring solenoid expansion valve flow rates |
JPH0686960B2 (en) * | 1985-01-30 | 1994-11-02 | 株式会社日立製作所 | Refrigerant flow controller |
JPS61197967A (en) * | 1985-02-26 | 1986-09-02 | 株式会社ボッシュオートモーティブ システム | Cooling cycle |
JPH07111288B2 (en) * | 1985-09-20 | 1995-11-29 | 株式会社日立製作所 | Air conditioner |
DE3601817A1 (en) * | 1986-01-22 | 1987-07-23 | Egelhof Fa Otto | CONTROL DEVICE FOR THE REFRIGERANT FLOW FOR EVAPORATING REFRIGERATION SYSTEMS OR HEAT PUMPS AND EXPANSION VALVES ARRANGED IN THE REFRIGERANT FLOW |
US5222371A (en) * | 1989-12-28 | 1993-06-29 | Matsushita Electric Industrial Co., Ltd. | Air conditioner of multichamber type |
JPH06103130B2 (en) * | 1990-03-30 | 1994-12-14 | 株式会社東芝 | Air conditioner |
DE4010770C1 (en) * | 1990-04-04 | 1991-11-21 | Danfoss A/S, Nordborg, Dk | |
US5271238A (en) * | 1990-09-14 | 1993-12-21 | Nartron Corporation | Environmental control system |
US5289692A (en) * | 1993-01-19 | 1994-03-01 | Parker-Hannifin Corporation | Apparatus and method for mass flow control of a working fluid |
WO1994017346A1 (en) * | 1993-01-19 | 1994-08-04 | Parker-Hannifin Corporation | System for controlling flow of working fluids |
-
1995
- 1995-02-03 US US08/383,250 patent/US5551248A/en not_active Expired - Lifetime
-
1996
- 1996-01-31 WO PCT/US1996/001398 patent/WO1996024016A1/en not_active Application Discontinuation
- 1996-01-31 CA CA002211853A patent/CA2211853C/en not_active Expired - Lifetime
- 1996-01-31 EP EP96906268A patent/EP0809773A1/en not_active Withdrawn
- 1996-01-31 AU AU49708/96A patent/AU4970896A/en not_active Abandoned
- 1996-01-31 MX MX9705885A patent/MX9705885A/en unknown
Also Published As
Publication number | Publication date |
---|---|
AU4970896A (en) | 1996-08-21 |
CA2211853C (en) | 2006-05-02 |
MX9705885A (en) | 1998-02-28 |
US5551248A (en) | 1996-09-03 |
EP0809773A1 (en) | 1997-12-03 |
WO1996024016A1 (en) | 1996-08-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKEX | Expiry |
Effective date: 20160201 |