EG16951A - Method and apparatus for controlling a refrigerant expansion valve in a refrigeration system - Google Patents

Method and apparatus for controlling a refrigerant expansion valve in a refrigeration system

Info

Publication number
EG16951A
EG16951A EG792/84A EG79284A EG16951A EG 16951 A EG16951 A EG 16951A EG 792/84 A EG792/84 A EG 792/84A EG 79284 A EG79284 A EG 79284A EG 16951 A EG16951 A EG 16951A
Authority
EG
Egypt
Prior art keywords
controlling
expansion valve
refrigeration system
refrigerant expansion
refrigerant
Prior art date
Application number
EG792/84A
Other languages
English (en)
Original Assignee
Carrier Corp
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 Carrier Corp filed Critical Carrier Corp
Application granted granted Critical
Publication of EG16951A publication Critical patent/EG16951A/xx

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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
    • G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
    • G05D23/1931—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of one space
    • 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
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F25B41/35—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by rotary motors, e.g. by stepping motors
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Air Conditioning Control Device (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
EG792/84A 1983-12-19 1984-12-19 Method and apparatus for controlling a refrigerant expansion valve in a refrigeration system EG16951A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/562,896 US4523435A (en) 1983-12-19 1983-12-19 Method and apparatus for controlling a refrigerant expansion valve in a refrigeration system

Publications (1)

Publication Number Publication Date
EG16951A true EG16951A (en) 1992-06-30

Family

ID=24248251

Family Applications (1)

Application Number Title Priority Date Filing Date
EG792/84A EG16951A (en) 1983-12-19 1984-12-19 Method and apparatus for controlling a refrigerant expansion valve in a refrigeration system

Country Status (13)

Country Link
US (1) US4523435A (xx)
EP (1) EP0146486A3 (xx)
JP (1) JPS60162170A (xx)
KR (1) KR890003630B1 (xx)
AU (1) AU550195B2 (xx)
BR (1) BR8406428A (xx)
CA (1) CA1233656A (xx)
DK (1) DK590784A (xx)
EG (1) EG16951A (xx)
IN (1) IN163332B (xx)
MX (1) MX162081A (xx)
MY (1) MY100907A (xx)
PH (1) PH22189A (xx)

Families Citing this family (97)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60140075A (ja) * 1983-12-28 1985-07-24 株式会社東芝 冷凍サイクルの制御方法
JPS6136671A (ja) * 1984-07-26 1986-02-21 三洋電機株式会社 冷媒流量制御装置
JPH0755617B2 (ja) * 1984-09-17 1995-06-14 株式会社ゼクセル 車両用空気調和装置
US4616484A (en) * 1984-11-30 1986-10-14 Kysor Industrial Corporation Vehicle refrigerant heating and cooling system
JPS61143662A (ja) * 1984-12-14 1986-07-01 サンデン株式会社 車両用冷房冷蔵装置
US4621502A (en) * 1985-01-11 1986-11-11 Tyler Refrigeration Corporation Electronic temperature control for refrigeration system
JPH0686960B2 (ja) * 1985-01-30 1994-11-02 株式会社日立製作所 冷媒流量制御装置
JPS61197967A (ja) * 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 冷房サイクル
DE3601817A1 (de) * 1986-01-22 1987-07-23 Egelhof Fa Otto Regelvorrichtung fuer den kaeltemittelzustrom zum verdampfer von kaelteanlagen oder waermepumpen sowie im kaeltemittelstrom angeordnete expansionsventile
US4785639A (en) * 1986-05-20 1988-11-22 Sundstrand Corporation Cooling system for operation in low temperature environments
JPS6382167U (xx) * 1986-11-18 1988-05-30
US4796436A (en) * 1986-12-09 1989-01-10 Carrier Corporation Heat pump charging
US4848100A (en) * 1987-01-27 1989-07-18 Eaton Corporation Controlling refrigeration
US4995240A (en) * 1987-01-27 1991-02-26 Eaton Corporation Controlling refrigeration having control module directly attached on valve body
JPH07111283B2 (ja) * 1987-03-20 1995-11-29 株式会社日立製作所 多室形空気調和装置
DE3713869A1 (de) * 1987-04-25 1988-11-03 Danfoss As Regelgeraet fuer die ueberhitzungstemperatur des verdampfers einer kaelte- oder waermepumpanlage
US4735054A (en) * 1987-08-13 1988-04-05 Honeywell Inc. Method for minimizing off cycle losses of a refrigeration system during a cooling mode of operation and an apparatus using the method
US4841734A (en) * 1987-11-12 1989-06-27 Eaton Corporation Indicating refrigerant liquid saturation point
GB2215867B (en) * 1988-02-09 1992-09-02 Toshiba Kk Air conditioner system with control for optimum refrigerant temperature
US4895301A (en) * 1988-03-09 1990-01-23 Robertshaw Controls Company Engine coolant system and method of making the same
US4848652A (en) * 1988-03-09 1989-07-18 Robertshaw Controls Company Vehicle engine coolant system and method of making the same
US4873836A (en) * 1988-06-06 1989-10-17 Eaton Corporation Flow noise suppression for electronic valves
US4848099A (en) * 1988-09-14 1989-07-18 Honeywell Inc. Adaptive refrigerant control algorithm
GB8908338D0 (en) * 1989-04-13 1989-06-01 Motor Panels Coventry Ltd Control systems for automotive air conditioning systems
US4969628A (en) * 1989-11-20 1990-11-13 Robertshaw Controls Company Valve construction and method of making the same
US5100245A (en) * 1990-03-19 1992-03-31 Eaton Corporation Sensing refrigerant temperature in a thermostatic expansion valve
US5187944A (en) * 1992-04-10 1993-02-23 Eaton Corporation Variable superheat target strategy for controlling an electrically operated refrigerant expansion valve
JPH0733407U (ja) * 1992-04-13 1995-06-20 有限会社飯塚工業所 分岐管装置
US5311748A (en) * 1992-08-12 1994-05-17 Copeland Corporation Control system for heat pump having decoupled sensor arrangement
US5329462A (en) * 1992-12-24 1994-07-12 Carrier Corporation Expansion valve control
US5355692A (en) * 1993-09-01 1994-10-18 Thermo King Corporation Phase change location controller for a heat exchanger in a refrigeration system
US5533347A (en) * 1993-12-22 1996-07-09 Novar Electronics Corporation Method of refrigeration case control
AT402026B (de) * 1994-09-29 1997-01-27 Gossler Ewald Verfahren und vorrichtung zum kühlen von gasen
US5551248A (en) 1995-02-03 1996-09-03 Heatcraft Inc. Control apparatus for space cooling system
DE19506143C2 (de) * 1995-02-22 1998-01-15 Danfoss As Verfahren zur Regelung der Überhitzungstemperatur des Kältemittels in einer Verdampfereinrichtung einer Kälte- oder Wärmepumpanlage und Vorrichtung zur Durchführung des Verfahrens
DE69636207T2 (de) 1995-03-14 2007-04-05 Hussmann Corp. Verkaufsmöbel mit modularen Verdampferrohrschlangen und elektronischer Steuerung der Verdampfdruckregelung
US5628201A (en) * 1995-04-03 1997-05-13 Copeland Corporation Heating and cooling system with variable capacity compressor
US5502970A (en) * 1995-05-05 1996-04-02 Copeland Corporation Refrigeration control using fluctuating superheat
US5829265A (en) 1996-06-28 1998-11-03 Carrier Corporation Suction service valve
US5692389A (en) * 1996-06-28 1997-12-02 Carrier Corporation Flash tank economizer
US5867998A (en) * 1997-02-10 1999-02-09 Eil Instruments Inc. Controlling refrigeration
US5970726A (en) * 1997-04-08 1999-10-26 Heatcraft Inc. Defrost control for space cooling system
US6141981A (en) * 1999-03-26 2000-11-07 Carrier Corporation Superheat control for optimum capacity under power limitation and using a suction modulation valve
JP2001027458A (ja) * 1999-07-15 2001-01-30 Daikin Ind Ltd 冷凍装置
US6260368B1 (en) * 2000-01-10 2001-07-17 Robert Walter Redlich Evaporator superheat stabilizer
US6718781B2 (en) 2001-07-11 2004-04-13 Thermo King Corporation Refrigeration unit apparatus and method
ITPD20010173A1 (it) * 2001-07-12 2003-01-12 Carel Srl Dispositivo per limitare la pressione di condensazione di una macchina frigorifera
US6715304B1 (en) 2002-12-05 2004-04-06 Lyman W. Wycoff Universal refrigerant controller
ITVR20020132A1 (it) * 2002-12-27 2004-06-28 Tecla Di Schiro & Isotta S N C Gruppo macchina operatrice - confezionatrice sotto vuoto.
US20050126190A1 (en) * 2003-12-10 2005-06-16 Alexander Lifson Loss of refrigerant charge and expansion valve malfunction detection
CN101713397B (zh) 2003-12-30 2014-07-09 艾默生环境优化技术有限公司 压缩机保护和诊断系统
US7412842B2 (en) 2004-04-27 2008-08-19 Emerson Climate Technologies, Inc. Compressor diagnostic and protection system
US7275377B2 (en) 2004-08-11 2007-10-02 Lawrence Kates Method and apparatus for monitoring refrigerant-cycle systems
US8096141B2 (en) * 2005-01-25 2012-01-17 Trane International Inc. Superheat control by pressure ratio
EP1880149A4 (en) * 2005-04-05 2012-09-26 Product Group Llc INTELLIGENT CONTROL UNIT FOR AIR CONDITIONING AND REFRIGERATION SYSTEMS
US20070251256A1 (en) * 2006-03-20 2007-11-01 Pham Hung M Flash tank design and control for heat pumps
KR100801142B1 (ko) * 2006-06-17 2008-02-11 에너지마스타 주식회사 히트펌프용 팽창조절밸브
US8590325B2 (en) 2006-07-19 2013-11-26 Emerson Climate Technologies, Inc. Protection and diagnostic module for a refrigeration system
US20080216494A1 (en) 2006-09-07 2008-09-11 Pham Hung M Compressor data module
CN101311851B (zh) * 2007-05-25 2013-05-22 开利公司 用于冷却器电子膨胀阀的修改的模糊控制
US20090037142A1 (en) 2007-07-30 2009-02-05 Lawrence Kates Portable method and apparatus for monitoring refrigerant-cycle systems
US8393169B2 (en) * 2007-09-19 2013-03-12 Emerson Climate Technologies, Inc. Refrigeration monitoring system and method
KR100916676B1 (ko) * 2007-10-02 2009-09-08 주식회사 삼에스코리아 냉동 시스템에서의 팽창밸브 제어 장치 및 방법
US8160827B2 (en) 2007-11-02 2012-04-17 Emerson Climate Technologies, Inc. Compressor sensor module
US9140728B2 (en) 2007-11-02 2015-09-22 Emerson Climate Technologies, Inc. Compressor sensor module
CN101910762A (zh) * 2008-01-11 2010-12-08 开利公司 使用可调整膨胀阀来控制去湿
US8156750B2 (en) * 2008-07-29 2012-04-17 Agri Control Technologies, Inc. Dynamic superheat control for high efficiency refrigeration system
US8539785B2 (en) 2009-02-18 2013-09-24 Emerson Climate Technologies, Inc. Condensing unit having fluid injection
US8375734B2 (en) * 2009-02-27 2013-02-19 Electrolux Home Products, Inc. Fresh food ice maker control
DE102009026942B4 (de) 2009-06-15 2016-02-04 Honeywell Technologies Sarl Verfahren zum Regeln von Wärmepumpen- und Kälteanlagen
WO2011046803A2 (en) * 2009-10-14 2011-04-21 Carrier Corporation Dehumidification control in refrigerant vapor compression systems
CN103717985B (zh) * 2009-12-18 2016-08-03 开利公司 运输制冷系统和用于运输制冷系统以解决动态条件的方法
DE102010001024B4 (de) 2010-01-19 2015-08-13 Honeywell Technologies Sarl Verfahren für die Steuerung und Regelung von Wärmepumpen und Kühlanlagen
CN103597292B (zh) 2011-02-28 2016-05-18 艾默生电气公司 用于建筑物的供暖、通风和空调hvac系统的监视系统和监视方法
CN103033007B (zh) * 2011-09-29 2015-11-18 杭州三花研究院有限公司 一种汽车空调系统电子膨胀阀的控制方法
US9151526B2 (en) * 2011-12-22 2015-10-06 Lennox Industries Inc. Method to control electronic expansion valve
US8964338B2 (en) 2012-01-11 2015-02-24 Emerson Climate Technologies, Inc. System and method for compressor motor protection
WO2013144996A1 (ja) * 2012-03-27 2013-10-03 三菱電機株式会社 空気調和装置
DE102012208819B4 (de) 2012-05-25 2018-08-16 Honeywell Technologies Sarl Verfahren für die steuerung und regelung von kälteanlagen und wärmepumpen mit luftbeaufschlagtem verdampfer
US9480177B2 (en) 2012-07-27 2016-10-25 Emerson Climate Technologies, Inc. Compressor protection module
WO2014029402A1 (en) * 2012-08-23 2014-02-27 Danfoss A/S A method for controlling a vapour compression system during start-up
US9310439B2 (en) 2012-09-25 2016-04-12 Emerson Climate Technologies, Inc. Compressor having a control and diagnostic module
CA2842658C (en) * 2013-02-12 2020-08-25 National Refrigeration & Air Conditioning Canada Corp. Condenser unit
US9551504B2 (en) 2013-03-15 2017-01-24 Emerson Electric Co. HVAC system remote monitoring and diagnosis
US9803902B2 (en) 2013-03-15 2017-10-31 Emerson Climate Technologies, Inc. System for refrigerant charge verification using two condenser coil temperatures
WO2014144446A1 (en) 2013-03-15 2014-09-18 Emerson Electric Co. Hvac system remote monitoring and diagnosis
MX364025B (es) 2013-03-26 2019-04-11 Aaim Controls Inc Sistema de control de circuito de refrigeracion.
CN106030221B (zh) 2013-04-05 2018-12-07 艾默生环境优化技术有限公司 具有制冷剂充注诊断功能的热泵系统
CN104515333B (zh) * 2013-09-28 2017-11-03 杭州三花研究院有限公司 制冷剂循环系统
EP3086053B1 (en) * 2013-12-16 2018-06-06 Mitsubishi Electric Corporation Heat pump hot water supply device
US20170299240A1 (en) * 2016-03-18 2017-10-19 Carrier Corporation Electronic expansion valve superheat recovery for a variable speed compressor system
US10823474B2 (en) 2016-05-24 2020-11-03 Carrier Corporation Perturbation of expansion valve in vapor compression system
ES2692207B1 (es) 2017-03-29 2019-09-16 Chillida Vicente Avila Procedimiento de regulación de compresores inverter en instalaciones de refrigeracion
US11493225B1 (en) * 2019-07-11 2022-11-08 Trane International Inc. Systems and methods for controlling superheat in a climate control system
US20210156596A1 (en) * 2019-11-27 2021-05-27 Carrier Corporation System and method for positioning a slider of a reversing valve
US20230324093A1 (en) * 2020-09-03 2023-10-12 Johnson Controls Tyco IP Holdings LLP Expansion valve control system
CN116981895A (zh) 2021-01-21 2023-10-31 伊凡尼·安东尼奥·戈比 具有集成模块驱动的电子膨胀阀的数字制冷控制器

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3577743A (en) * 1969-06-10 1971-05-04 Vilter Manufacturing Corp Control for refrigeration systems
US4112703A (en) * 1976-12-27 1978-09-12 Borg-Warner Corporation Refrigeration control system
US4362027A (en) * 1977-12-30 1982-12-07 Sporlan Valve Company Refrigeration control system for modulating electrically-operated expansion valves
US4448038A (en) * 1979-10-01 1984-05-15 Sporlan Valve Company Refrigeration control system for modulating electrically-operated expansion valves
US4407013A (en) * 1980-10-20 1983-09-27 Leeds & Northrup Company Self tuning of P-I-D controller by conversion of discrete time model identification parameters
JPS588956A (ja) * 1981-07-10 1983-01-19 株式会社システム・ホ−ムズ ヒ−トポンプ式冷暖房装置
JPS58117967A (ja) * 1981-12-31 1983-07-13 松下電器産業株式会社 冷凍サイクル制御装置
DE3220420A1 (de) * 1982-05-29 1983-12-15 Vereinigte Elektrizitätswerke Westfalen AG, 4600 Dortmund Verfahren zur regelung eines elektrisch ansteuerbaren expansionsventils
GB2130747B (en) * 1982-11-22 1986-09-17 Mitsubishi Electric Corp Control device for refrigeration cycle
FR2539855B1 (fr) * 1983-01-25 1985-09-27 Comp Generale Electricite Procede et dispositif de reglage du taux de detente dans une vanne de detente du fluide frigorifique d'un cycle de pompe a chaleur

Also Published As

Publication number Publication date
CA1233656A (en) 1988-03-08
KR890003630B1 (ko) 1989-09-28
DK590784A (da) 1985-06-20
EP0146486A3 (en) 1986-06-11
EP0146486A2 (en) 1985-06-26
BR8406428A (pt) 1985-10-15
JPS60162170A (ja) 1985-08-23
KR850004323A (ko) 1985-07-11
IN163332B (xx) 1988-09-10
DK590784D0 (da) 1984-12-11
JPH0348428B2 (xx) 1991-07-24
AU550195B2 (en) 1986-03-06
MX162081A (es) 1991-03-25
US4523435A (en) 1985-06-18
MY100907A (en) 1991-05-16
AU3331484A (en) 1985-06-27
PH22189A (en) 1988-06-28

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