CA2147065A1 - Method of Refrigeration Case Control - Google Patents
Method of Refrigeration Case ControlInfo
- Publication number
- CA2147065A1 CA2147065A1 CA2147065A CA2147065A CA2147065A1 CA 2147065 A1 CA2147065 A1 CA 2147065A1 CA 2147065 A CA2147065 A CA 2147065A CA 2147065 A CA2147065 A CA 2147065A CA 2147065 A1 CA2147065 A1 CA 2147065A1
- Authority
- CA
- Canada
- Prior art keywords
- refrigeration case
- expansion valve
- temperature
- evaporator coil
- refrigeration
- 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
- 238000005057 refrigeration Methods 0.000 title abstract 8
- 238000000034 method Methods 0.000 title abstract 2
- 230000003044 adaptive effect Effects 0.000 abstract 1
- 238000005070 sampling Methods 0.000 abstract 1
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
- F25B49/022—Compressor 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
- 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
-
- 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
- F25D29/00—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
- G05D23/1917—Control of temperature characterised by the use of electric means using digital means
-
- 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
- G05D23/1932—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 a plurality of spaces
- G05D23/1934—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 a plurality of spaces each space being provided with one sensor acting on one or more control means
-
- 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
-
- 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
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
-
- 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
- F25B2400/22—Refrigeration systems for supermarkets
-
- 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
- F25B2600/027—Compressor control by controlling pressure
- F25B2600/0272—Compressor control by controlling pressure the suction pressure
-
- 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
- F25B2600/23—Time delays
-
- 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
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1933—Suction pressures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
- F25B2700/21172—Temperatures of an evaporator of the fluid cooled by the evaporator at the inlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
- F25B2700/21173—Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21174—Temperatures of an evaporator of the refrigerant at the inlet of the 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21175—Temperatures of an evaporator of the refrigerant at the outlet of the 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/02—Sensors detecting door opening
-
- 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
Abstract
A method of controlling a refrigeration case of a refrigeration system including the steps of locating an expansion valve of a refrigeration case, moving the expansion valve of the refrigeration case out of a predetermined position, sampling temperature readings from an evaporator coil of a refrigeration case, calculating an adaptive proportional-integral-differential (PID) of the temperature of the evaporator coil for the refrigeration case, and moving the expansion valve to a second position closer to the predetermined position based on the calculated proportional-integral-differential until the temperature of the evaporator coil for the refrigeration case is within a predetermined temperature range.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/396,698 | 1995-03-01 | ||
US08/396,698 US5533347A (en) | 1993-12-22 | 1995-03-01 | Method of refrigeration case control |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2147065A1 true CA2147065A1 (en) | 1996-09-02 |
CA2147065C CA2147065C (en) | 1998-05-12 |
Family
ID=23568298
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002147065A Expired - Fee Related CA2147065C (en) | 1995-03-01 | 1995-04-13 | Method of refrigeration case control |
Country Status (5)
Country | Link |
---|---|
US (1) | US5533347A (en) |
EP (1) | EP0730129B1 (en) |
CA (1) | CA2147065C (en) |
DE (1) | DE69529812T2 (en) |
ES (1) | ES2194041T3 (en) |
Families Citing this family (45)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NZ304969A (en) | 1995-03-14 | 1998-07-28 | Hussmann Corp | Refrigerated merchandiser having modular evaporator coils |
US5867995A (en) * | 1995-07-14 | 1999-02-09 | Energy Controls International, Inc. | Electronic control of refrigeration systems |
US5809789A (en) * | 1997-05-07 | 1998-09-22 | Baker; Philip L. | Refrigeration module |
US6250560B1 (en) * | 1998-12-21 | 2001-06-26 | Acutherm L.P. | Variable-air-volume diffuser actuator assembly and method |
US6505475B1 (en) | 1999-08-20 | 2003-01-14 | Hudson Technologies Inc. | Method and apparatus for measuring and improving efficiency in refrigeration systems |
US6302654B1 (en) * | 2000-02-29 | 2001-10-16 | Copeland Corporation | Compressor with control and protection system |
US6647735B2 (en) * | 2000-03-14 | 2003-11-18 | Hussmann Corporation | Distributed intelligence control for commercial refrigeration |
US7000422B2 (en) | 2000-03-14 | 2006-02-21 | Hussmann Corporation | Refrigeration system and method of configuring the same |
US6973794B2 (en) * | 2000-03-14 | 2005-12-13 | Hussmann Corporation | Refrigeration system and method of operating the same |
US7047753B2 (en) * | 2000-03-14 | 2006-05-23 | Hussmann Corporation | Refrigeration system and method of operating the same |
US6999996B2 (en) * | 2000-03-14 | 2006-02-14 | Hussmann Corporation | Communication network and method of communicating data on the same |
US6332327B1 (en) | 2000-03-14 | 2001-12-25 | Hussmann Corporation | Distributed intelligence control for commercial refrigeration |
US6360553B1 (en) * | 2000-03-31 | 2002-03-26 | Computer Process Controls, Inc. | Method and apparatus for refrigeration system control having electronic evaporator pressure regulators |
US7866342B2 (en) | 2002-12-18 | 2011-01-11 | Vapor Technologies, Inc. | Valve component for faucet |
US8555921B2 (en) | 2002-12-18 | 2013-10-15 | Vapor Technologies Inc. | Faucet component with coating |
US8220489B2 (en) | 2002-12-18 | 2012-07-17 | Vapor Technologies Inc. | Faucet with wear-resistant valve component |
US7866343B2 (en) | 2002-12-18 | 2011-01-11 | Masco Corporation Of Indiana | Faucet |
ES2239542B1 (en) * | 2004-03-08 | 2006-12-01 | Universidad De Oviedo Y El Politecnico De Torino. | DEVICE FOR HEAT FLOW CONTROL THROUGH THE WALL IN SMALL EQUIPMENT. |
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 |
US7296426B2 (en) * | 2005-02-23 | 2007-11-20 | Emerson Electric Co. | Interactive control system for an HVAC system |
US8550368B2 (en) * | 2005-02-23 | 2013-10-08 | Emerson Electric Co. | Interactive control system for an HVAC system |
WO2006097106A1 (en) * | 2005-03-18 | 2006-09-21 | Danfoss A/S | A method for controlling a refrigeration system |
US20070026205A1 (en) | 2005-08-01 | 2007-02-01 | Vapor Technologies Inc. | Article having patterned decorative coating |
DE102006052321A1 (en) * | 2005-11-24 | 2007-06-06 | Danfoss A/S | Method of analyzing a refrigeration system and method of controlling a refrigeration system |
US7797957B2 (en) * | 2006-04-12 | 2010-09-21 | Hussmann Corporation | Methods and apparatus for linearized temperature control of commercial refrigeration systems |
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 |
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 |
US9140728B2 (en) | 2007-11-02 | 2015-09-22 | Emerson Climate Technologies, Inc. | Compressor sensor module |
US8160827B2 (en) | 2007-11-02 | 2012-04-17 | Emerson Climate Technologies, Inc. | Compressor sensor module |
US7548170B1 (en) * | 2008-06-04 | 2009-06-16 | International Business Machines Corporation | Rear door heat exchanger instrumentation for heat quantity measurement |
US7992398B2 (en) * | 2008-07-16 | 2011-08-09 | Honeywell International Inc. | Refrigeration control system |
US8973379B2 (en) * | 2008-07-25 | 2015-03-10 | Hill Phoenix, Inc. | Refrigeration control systems and methods for modular compact chiller units |
AU2012223466B2 (en) | 2011-02-28 | 2015-08-13 | Emerson Electric Co. | Residential solutions HVAC monitoring and diagnosis |
US8964338B2 (en) | 2012-01-11 | 2015-02-24 | Emerson Climate Technologies, Inc. | System and method for compressor motor protection |
US9480177B2 (en) | 2012-07-27 | 2016-10-25 | Emerson Climate Technologies, Inc. | Compressor protection module |
US9310439B2 (en) | 2012-09-25 | 2016-04-12 | Emerson Climate Technologies, Inc. | Compressor having a control and diagnostic module |
US9803902B2 (en) | 2013-03-15 | 2017-10-31 | Emerson Climate Technologies, Inc. | System for refrigerant charge verification using two condenser coil temperatures |
US9638436B2 (en) | 2013-03-15 | 2017-05-02 | Emerson Electric Co. | HVAC system remote monitoring and diagnosis |
US9551504B2 (en) | 2013-03-15 | 2017-01-24 | Emerson Electric Co. | HVAC system remote monitoring and diagnosis |
CA2908362C (en) | 2013-04-05 | 2018-01-16 | Fadi M. Alsaleem | Heat-pump system with refrigerant charge diagnostics |
US11841176B2 (en) | 2021-12-01 | 2023-12-12 | Haier Us Appliance Solutions, Inc. | Method of operating an electronic expansion valve in an air conditioner unit |
US11841151B2 (en) | 2021-12-01 | 2023-12-12 | Haier Us Appliance Solutions, Inc. | Method of operating an electronic expansion valve in an air conditioner unit |
Family Cites Families (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4593533A (en) * | 1974-12-05 | 1986-06-10 | Alsenz Richard H | Method and apparatus for detecting and controlling the formation of ice or frost |
US4578959A (en) * | 1977-10-28 | 1986-04-01 | Alsenz Richard H | Method and apparatus for detecting and controlling the formation of ice or frost |
US4183223A (en) * | 1978-01-30 | 1980-01-15 | Alsenz Richard H | Method and apparatus for signal transmission in refrigeration units |
US4831832A (en) * | 1979-07-31 | 1989-05-23 | Alsenz Richard H | Method and apparatus for controlling capacity of multiple compressors refrigeration system |
US4951475A (en) * | 1979-07-31 | 1990-08-28 | Altech Controls Corp. | Method and apparatus for controlling capacity of a multiple-stage cooling system |
US4679404A (en) * | 1979-07-31 | 1987-07-14 | Alsenz Richard H | Temperature responsive compressor pressure control apparatus and method |
US4825662A (en) * | 1979-07-31 | 1989-05-02 | Alsenz Richard H | Temperature responsive compressor pressure control apparatus and method |
US4612776A (en) * | 1979-07-31 | 1986-09-23 | Alsenz Richard H | Method and apparatus for controlling capacity of a multiple-stage cooling system |
US4628700A (en) * | 1979-07-31 | 1986-12-16 | Alsenz Richard H | Temperature optimizer control apparatus and method |
DE3175212D1 (en) * | 1981-06-26 | 1986-10-02 | Richard H Alsenz | Refrigerator defrost control |
US4537038A (en) * | 1982-04-30 | 1985-08-27 | Alsenz Richard H | Method and apparatus for controlling pressure in a single compressor refrigeration system |
JPS5977179A (en) * | 1982-10-27 | 1984-05-02 | Syst Hoomuzu:Kk | Electronic expansion valve |
US4535602A (en) * | 1983-10-12 | 1985-08-20 | Richard H. Alsenz | Shift logic control apparatus for unequal capacity compressors in a refrigeration system |
US4523435A (en) * | 1983-12-19 | 1985-06-18 | Carrier Corporation | Method and apparatus for controlling a refrigerant expansion valve in a refrigeration system |
US4745767A (en) * | 1984-07-26 | 1988-05-24 | Sanyo Electric Co., Ltd. | System for controlling flow rate of refrigerant |
US4697431A (en) * | 1984-08-08 | 1987-10-06 | Alsenz Richard H | Refrigeration system having periodic flush cycles |
US4651535A (en) * | 1984-08-08 | 1987-03-24 | Alsenz Richard H | Pulse controlled solenoid valve |
US4633672A (en) * | 1985-02-19 | 1987-01-06 | Margaux Controls, Inc. | Unequal compressor refrigeration control system |
US5191643A (en) * | 1986-04-04 | 1993-03-02 | Alsenz Richard H | Method and apparatus for refrigeration control and display |
US5428966A (en) * | 1988-01-21 | 1995-07-04 | Alsenz; Richard H. | Refrigeration system utilizing an expansion device in the evaporator |
JPH02197776A (en) * | 1989-01-26 | 1990-08-06 | Fuji Electric Co Ltd | Electronic expansion valve control method for refrigerating show case |
US4918932A (en) * | 1989-05-24 | 1990-04-24 | Thermo King Corporation | Method of controlling the capacity of a transport refrigeration system |
JPH0359350A (en) * | 1989-07-28 | 1991-03-14 | Toshiba Corp | Air conditioner |
US5329462A (en) * | 1992-12-24 | 1994-07-12 | Carrier Corporation | Expansion valve control |
US5303562A (en) * | 1993-01-25 | 1994-04-19 | Copeland Corporation | Control system for heat pump/air-conditioning system for improved cyclic performance |
JP3117339B2 (en) * | 1993-01-27 | 2000-12-11 | 東芝キヤリア株式会社 | Refrigeration cycle device |
US5444987A (en) * | 1993-07-02 | 1995-08-29 | Alsenz; Richard H. | Refrigeration system utilizing a jet enthalpy compressor for elevating the suction line pressure |
-
1995
- 1995-03-01 US US08/396,698 patent/US5533347A/en not_active Expired - Lifetime
- 1995-04-13 CA CA002147065A patent/CA2147065C/en not_active Expired - Fee Related
- 1995-04-21 ES ES95302668T patent/ES2194041T3/en not_active Expired - Lifetime
- 1995-04-21 DE DE69529812T patent/DE69529812T2/en not_active Expired - Fee Related
- 1995-04-21 EP EP95302668A patent/EP0730129B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2194041T3 (en) | 2003-11-16 |
DE69529812T2 (en) | 2003-12-18 |
EP0730129B1 (en) | 2003-03-05 |
CA2147065C (en) | 1998-05-12 |
EP0730129A3 (en) | 1997-07-30 |
US5533347A (en) | 1996-07-09 |
EP0730129A2 (en) | 1996-09-04 |
DE69529812D1 (en) | 2003-04-10 |
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