US3633376A - Refrigeration apparatus control - Google Patents
Refrigeration apparatus control Download PDFInfo
- Publication number
- US3633376A US3633376A US691439A US3633376DA US3633376A US 3633376 A US3633376 A US 3633376A US 691439 A US691439 A US 691439A US 3633376D A US3633376D A US 3633376DA US 3633376 A US3633376 A US 3633376A
- Authority
- US
- United States
- Prior art keywords
- pressure
- refrigerant
- fan
- switch
- condenser
- 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.)
- Expired - Lifetime
Links
- 238000005057 refrigeration Methods 0.000 title claims abstract description 51
- 239000003507 refrigerant Substances 0.000 claims abstract description 84
- 239000004065 semiconductor Substances 0.000 claims abstract description 20
- 230000001012 protector Effects 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000006835 compression Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 abstract description 4
- 239000003990 capacitor Substances 0.000 description 6
- 230000001052 transient effect Effects 0.000 description 6
- 230000001143 conditioned effect Effects 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 206010059875 Device ineffective Diseases 0.000 description 1
- 241000396377 Tranes Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- 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
- G05D23/275—Control of temperature characterised by the use of electric means with sensing element expanding, contracting, or fusing in response to changes of temperature
-
- 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
-
- 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
Definitions
- a vapor compression refrigerant system is cycled in response to the refrigeration load.
- the system has a high-pressure-responsive safety protector for terminating operation of the system in response to an abnormally highrefrigerant pressure and a variable-speed condenser fan motor for controlling said refrigerant pressure in response to a variable resistance, said variable resistance being directly responsive to refrigerant pressure whereby said fan operates to maintain the refrigerant pressure below said abnormally highrefrigerant pressure immediately following startup of said compressor and above a predetermined minimum pressure during the run cycle of said system.
- the pressure-resistive transducer is a piezoresistive semiconductor.
- Modulated condenser fan speed controls have also been known for a number of years.
- the condenser fan speed is varied in response to a temperature sensor placed on the condenser in an area of saturated refrigerant where temperature of the refrigerant has been assumed to be directly related to the pressure of the refrigerant.
- the variation in resistance of the temperature sensor is then used to control a solid-state switch in series with the condenser fan motor thereby controlling the fan speed and thus the temperature or pressure of the condenser. This type of system is satisfactory when operated continuously.
- Another object of the invention is to provide a refrigeration system with a variable-speed condenser fan using a directly sensing pressure-resistive transducer.
- a further object is to construct the above-mentioned transducer with a piezoresistive component.
- This invention involves a refrigeration apparatus comprising a refrigerant compressor; an air-cooled refrigerant condenser; refrigerant throttling means; and a refrigerant evaporator respectively serially connected in a closed refrigerant circuit wherein that portion of said refrigerant circuit extending from said compressor through said condenser to said throttling means is the high-pressure side; a fan disposed to pass cooling air over said refrigerant condenser; an electric fan motor drivingly connected to said fan; an alternating-current power source for said motor; a gated semiconductor switch; a first electric circuit means serially connecting said altemating-current power source, said gated semiconductor switch and said electric fan motor; a fluid pressure-electrical resistive transducer; means connecting said transducer to said high-pressure side of said refrigeration system to respond to the refrigerant pressure therein; and second electric circuit means including said electrical resistive transducer, said alternating-current power source, and the gate of said gated semiconductor switch connected for controlling said
- FIG. I is a diagrammatic view of a refrigeration system and control circuitry therefor incorporating the invention.
- FIG. 2 is an exemplary pressure-time chart for the refrigeration system of FIG. 1 operated in accordance with the teachings of this invention showing high side pressure in p.s.i. and time in minutes;
- FIG. 3 is a pressuretime chart for a similar system using a condenser temperature-responsive variable resistance for varying condenser fan speed under similar conditions.
- Refrigeration system 10 for cooling a conditioned space 12.
- Refrigeration system 10 includes a reciprocating refrigerant compressor 14, an aircooled refrigerant condenser 16, a refrigerant throttling means such as temperature responsive expansion valve 18, and refrigerant evaporator 20 respectively serially connected in a closed refrigerant loop or circuit.
- Compressor 14 includes a suction valve 22 for receiving refrigerant gas from evaporator 20 and a discharge valve 24 for discharging compressed refrigerant gas to condenser 16.
- Compressor 14 also includes a piston 26 for compressing refrigerant in a compression cylinder 27 communicating with valves 22 and 24. Piston 26 is reciprocally driven by electric motor 28.
- Condenser cooling fan 30 is arranged to pass cooling air over condenser 16 and is driven by electric motor 32.
- Compressor motor 28 and fan motor 32 are connected to an electric control circuit network 34 including an altemating-current power source 35, a thermostatic switch 36 responsive to the temperature of conditioned space 12, a high-pressure cutout switch 38 arranged to open in response to abnormally high pressure in the high side, i.e., that portion of the refrigerant circuit extending from the compressor 14 through condenser 16 to throttling means 18 and a symmetrical gated switch 40 such as General Electric switch SC45B/SC46B.
- the circuit network 34 also includes components for controlling the operation of switch 40 including capacitor 42, pressure-resistive transducer 44 and a bidirectional diode switch 46 such as General Electric switch Z1238.
- Electric control network 34 presents a first electric circuit serially connecting altemating-current power source 35, thermostatic switch 36, high-pressure cutout switch 38, and compressor motor 28; and a second electric circuit serially connecting alternating-current power source 35, thermostatic switch 36, symmetrical gated switch 40 and condenser fan motor 32.
- a third circuit shunt switch 40 and includes transducer 44 and capacitor 42. The gate of switch 40 is connected to a point between transducer 44 and capacitor 42 via diode switch 46.
- Transducer 44 is comprised of a bellows actuator 48 connected internally to the high-pressure side of the refrigeration system, and a semiconductor piezoresistive element 50 which may be in the form of a crystal positioned to be compressed by expansion of bellows 48 supported in frame member 52. Element 50 presents a resistance in the shunt circuit which varies in response to the pressure exerted thereon by bellows 48 with refrigerant high side pressure.
- thermostatic switch 36 closes completing the aforesaid first circuit through normally closed cutout switch 38 whereby compressor motor 28 is energized and the piston 26 of compressor 14 is caused to reciprocate in the cylinder 27.
- compressor motor 28 On downward strokes of piston 26, refrigerant gas is drawn from evaporator 20 through suction valve 22 into cylinder 27.
- the refrigerant gas is compressed and discharged by way of discharge valve 24 to condenser 16.
- thermostatic switch 36 opens deenergizing fan motor 32 and compressor motor 28 thereby terminating operation of the refrigeration system.
- the temperature of the conditioned space again rises above the predetermined temperature the refrigeration system again is cycled into operation during which period the fan motor speed is controlled by piezoresistive element 50.
- the refrigerant pressure in the high-pressure side will vary.
- An example of such pressure variation is shown in the chart of FIG. 2. It should be noted that upon energization of compressor motor 27, the pressure rises quickly to a predetermined control pressure of about 200 p.s.i. This pressure is the minimum desired operating pressure and is set by the selection of pressure-resistive transducer 44, capacitor 42, and bidirectional diode switch 46. The pressure is maintained at this level by variation of the fan speed. Thus as the load on the condenser increases, the slight increase in pressure increases the fan speed. Similarly as the load on the condenser decreases, the slight decrease in pressure decreases the fan speed.
- FIG. 3 a similar chart is shown from the same system operated under similar conditions wherein the condenser fan is controlled indirectly via condenser temperature in accordance with the prior art.
- the pressure rises rapidly and far beyond the minimum control pressure. This pressure may far exceed those pressures resulting from fully loading the condenser. This excess pressure results from the delay in condenser fan staring due to the thermal lag at the temperature sensor. Since this transient pressure is dependent upon the thermal delay of the sensor, and if the delay be sufiicient, the upper pressure limits of the system may be exceeded.
- the fan finally starts, the pressure falls substantially below the predetermined control pressure. The pressure continues to hunt above and below the control pressure with wide swings for approximately 5 minutes. This hunting action produces excessive fan speed variations which are objectionable from the noise standpoint. This increase in pressure may also exceed the cutout pressure causing the system to shut down.
- the instant invention provides a refrigeration system which may be lighter in construction, requires a smaller compressor motor, eliminates premature cutout of the compressor, and is generally safer and quieter to operate.
- a refrigeration apparatus comprising a refrigerant compressor; an air-cooled refrigerant condenser; refrigerant throttling means; and a refrigerant evaporator respectively serially connected in a closed refrigerant circuit wherein that portion of said refrigerant circuit extending from said compressor through said condenser to said throttling means is the highpressure side; a fan disposed to pass cooling air over said refrigerant condenser; an electric fan motor drivingly connected to said fan; an alternating-current power source for said motor, a gated semiconductor switch; a first electric circuit means serially connecting said alternating-current power source, said gated semiconductor switch and said electric fan motor; a fluid pressure-electrical resistive transducer; means connecting said transducer to said high-pressure side of said refrigeration system to respond to the refrigerant .pressure therein; and second electric circuit means including said electrical resistive transducer, said alternating current power source, and the gate of said gated semiconductor switch connected for controlling said gate in response
- said gated semiconductor switch is a symmetrical gated switch and said second electric circuit means includes a directional diode switch in series with the gate of said symmetrical gated switch.
- a refrigeration apparatus comprising: a refrigerant compressor; an air-cooled refrigeration condenser, refrigerant throttling means; and a refrigerant evaporator respectively serially connected in a cooled refrigerant circuit wherein that portion of said refrigerant circuit extending from said compressor through said condenser to said throttling means is the high-pressure side; a fan disposed to pass cooling air over said refrigerant condenser; a first electric motor drivingly connected to said fan; an alternating-current power source; a first electric circuit for said electric motor; a second electric circuit for said second electric motor; control means connected to said power source for cyclically energizing said first and second circuits in response to the load on said refrigeration apparatus; protector means for said pressure in said high-pressure side; means for operating said fan to maintain the refrigerant pressure in said high-pressure side below said abnonnally high refrigerant pressure immediately following energization of said first circuit and above a predetermined minimum pressure during the run
- a condenser means for circulating a refrigerant through said condenser, a fan for circulating air across said condenser to reduce the temperature of and thereby condense the refrigerant circulating therethrough, an electric motor for driving said fan, and control means including an element capable of directly sensing the head pressure in said refrigeration system and having an electrical output with a magnitude proportional to the sensed pressure, switch means connected in series with the fan motor and source of operating voltage, whereby said motor is connected across said source of operating voltage and thereby energized when said switch means is closed, and cyclically operating switchcontrolling circuit means for opening and closing said switch means and for varying the duration of the period for which said switch means is closed in each operating cycle of said circuit means as the magnitude of the output of the sensing element varies, whereby the speed of the fan motor is varied as the sensed pressure changes to prevent the pressure in the system from falling below a predetermined minimum.
- a condenser means for circulating a refrigerant through said condenser, a fan for circulating air across said condenser to reduce the temperature of and whereby condense the refrigerant circulating therethrough, an electric motor for driving said fan, and control means for varying the speed of said motor and thereby the fan speed as the head pressure changes in said system to prevent the pressure from falling below a predetermined minimum during operation of said system, said control means including an element capable of directly sensing the head pressure in said refrigeration system, switch means connected in series with the fan motor and a source of operating voltage, whereby said motor is connected across said source of operating voltage and thereby energized when said switch means is closed and switch-controlling circuit means for alternatively opening and closing said switch means and for varying the duration of the period for which said switch means is closed in each operating cycle thereof as the pressure sensed by said sensing element varies, whereby the speed of the fan motor is varied as the sensed pressure changes.
- control means for regulating the speed of the fan motor as to vary said speed in accord with changes in the pressure of a specified body of fluid
- said control means including switch means adapted to connect the fan motor in series with a source of operating voltage, whereby said fan motor is connected across said source of operating voltage and thereby energized when said switch means is closed and cyclically operating switchcontrolling circuit means including a sensing element directly responsive to pressure for opening and closing said switch means and for varyin the duration of the period for which said switch means 18 c osed m each operatmg cycle of said CH- cuit means as the pressure sensed by said sensing element varies, whereby the speed of the fan motor is varied as the sensed pressure changes.
- a condenser means for circulating a refrigerant through said condenser, a fan for circulating air across said condenser to reduce the temperature of and thereby condense the refrigerant circulating therethrough, an electric motor for driving said fan, and control means including a pressure-responsive element capable of directly sensing the head pressure in said refrigeration system for varying the speed of said fan and the head pressure changes to prevent pressure from falling below a predetermined minimum during operation of said system, switch means connected between the fan motor and a source of operating voltage, whereby said motor is connected across said source of operating voltage and thereby energized when said switch means is closed, a source of control voltage, and cyclically operating circuit means connected between said source of control voltage and said switch means for opening and closing said switch means, said circuit means including means for varying the duration of the period for which said switch means is closed in each operating cycle of said circuit means as the control voltage applied to said circuit means is varied, said pressure-responsive element including a variable resistor connected between said control voltage source
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Air Conditioning Control Device (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
Description
Claims (10)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US69143967A | 1967-12-18 | 1967-12-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3633376A true US3633376A (en) | 1972-01-11 |
Family
ID=24776539
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US691439A Expired - Lifetime US3633376A (en) | 1967-12-18 | 1967-12-18 | Refrigeration apparatus control |
Country Status (2)
Country | Link |
---|---|
US (1) | US3633376A (en) |
GB (1) | GB1186120A (en) |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3739596A (en) * | 1971-11-10 | 1973-06-19 | Gen Electric | Refrigeration system including head pressure control means |
US3783630A (en) * | 1971-11-24 | 1974-01-08 | Cdrh Ltd | Method and apparatus for cooling liquids |
US3958429A (en) * | 1975-01-17 | 1976-05-25 | Dravo Corporation | Air-cooled condenser pressure control at low ambient temperatures |
US4003729A (en) * | 1975-11-17 | 1977-01-18 | Carrier Corporation | Air conditioning system having improved dehumidification capabilities |
US4075865A (en) * | 1975-12-05 | 1978-02-28 | Borg-Warner Corporation | Apparatus for controlling condenser pressure in a refrigeration system |
US4205944A (en) * | 1973-08-16 | 1980-06-03 | Suddeutsche Kuhlerfabrick Julius Fr. Behr | Electronic control circuit for blowers in vehicles |
US4288991A (en) * | 1976-03-30 | 1981-09-15 | Weeks Harold R | Refrigeration and heating improvement |
US4930320A (en) * | 1988-05-16 | 1990-06-05 | Honda Giken Kogyo Kabushiki Kaisha | Cooling fan controlling apparatus for vehicle with air conditioner |
US5056325A (en) * | 1986-12-04 | 1991-10-15 | The Cornelius Company | Ice cube maker with new freeze and harvest control |
US5355693A (en) * | 1993-04-12 | 1994-10-18 | The Dometic Corporation | Power ventilator for a refrigerator in a vehicle |
ES2092424A1 (en) * | 1992-09-16 | 1996-11-16 | Ornaque Carlos Gutierrez | Mixed-unit safety cooling system |
US5761918A (en) * | 1995-05-01 | 1998-06-09 | Index Sensors And Controls, Inc. | Integrated controller for commercial vehicle air conditioning system |
US20040187514A1 (en) * | 2003-03-27 | 2004-09-30 | Doug Franck | Refrigeration system and method for beverage dispenser |
US20050229622A1 (en) * | 2003-03-27 | 2005-10-20 | Coca-Cola | Refrigeration system and method for beverage dispenser |
EP1630497A2 (en) * | 2004-08-31 | 2006-03-01 | Officine Meccaniche Industriali S.r.l. | Cooling plant for a fluid with control of variables |
US20060168986A1 (en) * | 2005-02-02 | 2006-08-03 | Sanyo Electric Co., Ltd. | Beverage supply device |
US20110259041A1 (en) * | 2010-04-21 | 2011-10-27 | Whirlpool Corporation | High efficiency condenser |
DE102006061413B4 (en) * | 2006-01-12 | 2012-04-05 | Secop Gmbh | Method and control unit for starting a compressor |
US10451325B2 (en) | 2012-08-24 | 2019-10-22 | Carrier Corporation | Transcritical refrigerant vapor compression system high side pressure control |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2705404A (en) * | 1952-05-08 | 1955-04-05 | Gen Electric | Cooling arrangement for condenser of refrigerating system |
US2939317A (en) * | 1955-10-31 | 1960-06-07 | Bell Telephone Labor Inc | Variable resistance semiconductive devices |
US2952991A (en) * | 1959-02-20 | 1960-09-20 | Carrier Corp | High side pressure control for refrigeration systems |
US3160844A (en) * | 1962-03-22 | 1964-12-08 | Electro Optical Systems Inc | High output electrical strain transducers |
US3196629A (en) * | 1964-06-01 | 1965-07-27 | Carrier Corp | Refrigeration head pressure control systems |
US3270562A (en) * | 1964-01-07 | 1966-09-06 | Gen Electric | Solid state hydrostatic pressure gauge |
US3329023A (en) * | 1964-08-03 | 1967-07-04 | Schaevitz Bytrex Inc | Semiconductor strain gage transducers |
US3354665A (en) * | 1966-12-01 | 1967-11-28 | Trane Co | Condenser fan speed control |
US3390539A (en) * | 1966-10-31 | 1968-07-02 | Trane Co | Apparatus for controlling refrigeration systems |
US3402565A (en) * | 1966-07-26 | 1968-09-24 | Smith Corp A O | Pressure responsive refrigeration motor control |
US3403314A (en) * | 1965-10-22 | 1968-09-24 | Smith Corp A O | Condition responsive motor control having unijunction firing circuit for a triggeredswitch |
US3417361A (en) * | 1966-03-07 | 1968-12-17 | Conrac Corp | Semiconductive pressure transducer |
-
1967
- 1967-12-18 US US691439A patent/US3633376A/en not_active Expired - Lifetime
-
1968
- 1968-12-09 GB GB58292/68A patent/GB1186120A/en not_active Expired
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2705404A (en) * | 1952-05-08 | 1955-04-05 | Gen Electric | Cooling arrangement for condenser of refrigerating system |
US2939317A (en) * | 1955-10-31 | 1960-06-07 | Bell Telephone Labor Inc | Variable resistance semiconductive devices |
US2952991A (en) * | 1959-02-20 | 1960-09-20 | Carrier Corp | High side pressure control for refrigeration systems |
US3160844A (en) * | 1962-03-22 | 1964-12-08 | Electro Optical Systems Inc | High output electrical strain transducers |
US3270562A (en) * | 1964-01-07 | 1966-09-06 | Gen Electric | Solid state hydrostatic pressure gauge |
US3196629A (en) * | 1964-06-01 | 1965-07-27 | Carrier Corp | Refrigeration head pressure control systems |
US3329023A (en) * | 1964-08-03 | 1967-07-04 | Schaevitz Bytrex Inc | Semiconductor strain gage transducers |
US3403314A (en) * | 1965-10-22 | 1968-09-24 | Smith Corp A O | Condition responsive motor control having unijunction firing circuit for a triggeredswitch |
US3417361A (en) * | 1966-03-07 | 1968-12-17 | Conrac Corp | Semiconductive pressure transducer |
US3402565A (en) * | 1966-07-26 | 1968-09-24 | Smith Corp A O | Pressure responsive refrigeration motor control |
US3390539A (en) * | 1966-10-31 | 1968-07-02 | Trane Co | Apparatus for controlling refrigeration systems |
US3354665A (en) * | 1966-12-01 | 1967-11-28 | Trane Co | Condenser fan speed control |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3739596A (en) * | 1971-11-10 | 1973-06-19 | Gen Electric | Refrigeration system including head pressure control means |
US3783630A (en) * | 1971-11-24 | 1974-01-08 | Cdrh Ltd | Method and apparatus for cooling liquids |
US4205944A (en) * | 1973-08-16 | 1980-06-03 | Suddeutsche Kuhlerfabrick Julius Fr. Behr | Electronic control circuit for blowers in vehicles |
US3958429A (en) * | 1975-01-17 | 1976-05-25 | Dravo Corporation | Air-cooled condenser pressure control at low ambient temperatures |
US4003729A (en) * | 1975-11-17 | 1977-01-18 | Carrier Corporation | Air conditioning system having improved dehumidification capabilities |
US4075865A (en) * | 1975-12-05 | 1978-02-28 | Borg-Warner Corporation | Apparatus for controlling condenser pressure in a refrigeration system |
US4288991A (en) * | 1976-03-30 | 1981-09-15 | Weeks Harold R | Refrigeration and heating improvement |
US5056325A (en) * | 1986-12-04 | 1991-10-15 | The Cornelius Company | Ice cube maker with new freeze and harvest control |
US4930320A (en) * | 1988-05-16 | 1990-06-05 | Honda Giken Kogyo Kabushiki Kaisha | Cooling fan controlling apparatus for vehicle with air conditioner |
ES2092424A1 (en) * | 1992-09-16 | 1996-11-16 | Ornaque Carlos Gutierrez | Mixed-unit safety cooling system |
US5355693A (en) * | 1993-04-12 | 1994-10-18 | The Dometic Corporation | Power ventilator for a refrigerator in a vehicle |
US5761918A (en) * | 1995-05-01 | 1998-06-09 | Index Sensors And Controls, Inc. | Integrated controller for commercial vehicle air conditioning system |
US20040187514A1 (en) * | 2003-03-27 | 2004-09-30 | Doug Franck | Refrigeration system and method for beverage dispenser |
US7870749B2 (en) | 2003-03-27 | 2011-01-18 | The Coca-Cola Company | Beverage dispensing apparatus and method for beverage dispensing |
US20050229622A1 (en) * | 2003-03-27 | 2005-10-20 | Coca-Cola | Refrigeration system and method for beverage dispenser |
US20090301106A1 (en) * | 2003-03-27 | 2009-12-10 | The Coca-Cola Company | Beverage dispensing apparatus and method for beverage dispensing |
US7591140B2 (en) | 2003-03-27 | 2009-09-22 | The Coca-Cola Company | Beverage dispensing apparatus and method for beverage dispensing |
US7337624B2 (en) | 2003-03-27 | 2008-03-04 | The Coca-Cola Company | Refrigeration system and method for beverage dispenser |
US7181920B2 (en) | 2004-08-31 | 2007-02-27 | Officine Meccaniche Industriali Srl | Cooling plant for a fluid with control of variables |
EP1630497A3 (en) * | 2004-08-31 | 2006-07-12 | Officine Meccaniche Industriali S.r.l. | Cooling plant for a fluid with control of variables |
US20060042279A1 (en) * | 2004-08-31 | 2006-03-02 | Capellari Giovanni B | Cooling plant for a fluid with control of variables |
EP1630497A2 (en) * | 2004-08-31 | 2006-03-01 | Officine Meccaniche Industriali S.r.l. | Cooling plant for a fluid with control of variables |
US20060168986A1 (en) * | 2005-02-02 | 2006-08-03 | Sanyo Electric Co., Ltd. | Beverage supply device |
DE102006061413B4 (en) * | 2006-01-12 | 2012-04-05 | Secop Gmbh | Method and control unit for starting a compressor |
US20110259041A1 (en) * | 2010-04-21 | 2011-10-27 | Whirlpool Corporation | High efficiency condenser |
US10451325B2 (en) | 2012-08-24 | 2019-10-22 | Carrier Corporation | Transcritical refrigerant vapor compression system high side pressure control |
Also Published As
Publication number | Publication date |
---|---|
GB1186120A (en) | 1970-04-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TRANE COMPANY, THE Free format text: MERGER;ASSIGNOR:A-S CAPITAL INC. A CORP OF DE;REEL/FRAME:004334/0523 |
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AS | Assignment |
Owner name: TRANE COMPANY THE Free format text: MERGER;ASSIGNORS:TRANE COMPANY THE, A CORP OF WI (INTO);A-S CAPITAL INC., A CORP OF DE (CHANGED TO);REEL/FRAME:004372/0370 Effective date: 19840224 Owner name: AMERICAN STANDARD INC., A CORP OF DE Free format text: MERGER;ASSIGNORS:TRANE COMPANY, THE;A-S SALEM INC., A CORP. OF DE (MERGED INTO);REEL/FRAME:004372/0349 Effective date: 19841226 |
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Owner name: A-S CAPITAL INC., A CORP OF DE Free format text: MERGER;ASSIGNOR:TRANE COMPANY THE A WI CORP;REEL/FRAME:004432/0765 Effective date: 19840224 |
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Owner name: BANKERS TRUST COMPANY, NEW YORK Free format text: SECURITY INTEREST;ASSIGNOR:TRANE AIR CONDITIONING COMPANY, A DE CORP.;REEL/FRAME:004905/0213 Effective date: 19880624 Owner name: BANKERS TRUST COMPANY, 4 ALBANY STREET, 9TH FLOOR, Free format text: SECURITY INTEREST;ASSIGNOR:TRANE AIR CONDITIONING COMPANY, A DE CORP.;REEL/FRAME:004905/0213 Effective date: 19880624 Owner name: BANKERS TRUST COMPANY Free format text: SECURITY INTEREST;ASSIGNOR:AMERICAN STANDARD INC., A DE. CORP.,;REEL/FRAME:004905/0035 Effective date: 19880624 |
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Owner name: CHEMICAL BANK, AS COLLATERAL AGENT, NEW YORK Free format text: ASSIGNMENT OF SECURITY INTEREST;ASSIGNOR:BANKERS TRUST COMPANY, AS COLLATERAL TRUSTEE;REEL/FRAME:006565/0753 Effective date: 19930601 |
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Owner name: AMERICAN STANDARD, INC., NEW JERSEY Free format text: RELEASE OF SECURITY INTEREST (RE-RECORD TO CORRECT DUPLICATES SUBMITTED BY CUSTOMER. THE NEW SCHEDULE CHANGES THE TOTAL NUMBER OF PROPERTY NUMBERS INVOLVED FROM 1133 TO 794. THIS RELEASE OF SECURITY INTEREST WAS PREVIOUSLY RECORDED AT REEL 8869, FRAME 0001.);ASSIGNOR:CHASE MANHATTAN BANK, THE (FORMERLY KNOWN AS CHEMICAL BANK);REEL/FRAME:009123/0300 Effective date: 19970801 |
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Owner name: AMERICAN STANDARD, INC., NEW JERSEY Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:CHASE MANHATTAN BANK, THE (FORMERLY KNOWN AS CHEMICAL BANK);REEL/FRAME:008869/0001 Effective date: 19970801 |