WO2008109927A1 - Système de commande de réfrigération - Google Patents

Système de commande de réfrigération Download PDF

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Publication number
WO2008109927A1
WO2008109927A1 PCT/AU2008/000295 AU2008000295W WO2008109927A1 WO 2008109927 A1 WO2008109927 A1 WO 2008109927A1 AU 2008000295 W AU2008000295 W AU 2008000295W WO 2008109927 A1 WO2008109927 A1 WO 2008109927A1
Authority
WO
WIPO (PCT)
Prior art keywords
refrigeration
resistance
control system
resistance temperature
temperature detector
Prior art date
Application number
PCT/AU2008/000295
Other languages
English (en)
Inventor
Stuart Christopher James Kearns
Original Assignee
Kearns Stuart Christopher Jame
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
Priority claimed from AU2007901281A external-priority patent/AU2007901281A0/en
Application filed by Kearns Stuart Christopher Jame filed Critical Kearns Stuart Christopher Jame
Priority to AU2008226387A priority Critical patent/AU2008226387B2/en
Publication of WO2008109927A1 publication Critical patent/WO2008109927A1/fr

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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/006—Defroster control with electronic control circuits
    • 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
    • F25D21/02—Detecting the presence of frost or condensate
    • 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
    • F25D2700/12—Sensors measuring the inside temperature
    • F25D2700/123—Sensors measuring the inside temperature more than one sensor measuring the inside temperature in a compartment

Definitions

  • the present invention relates broadly to refrigeration. More particularly, the present invention relates to a system for controlling refrigeration and a method of using such a system and will herein be described generally in that context. It is to be appreciated, however, that the invention may be adapted for use in other applications.
  • ice builds up on the evaporative coil fins as warm, moist air blows across the cold evaporator coil. This ice build-up decreases the heat transfer efficiency of the evaporator. It does this firstly by acting as an insulator on the heat exchanger and secondly decreases the air space between the evaporator fins, causing the air to move faster and have less time in contact with the heat exchanger. In order to operate continuously the ice build-up must be periodically defrosted.
  • the controls for the defrosting cycle of a refrigeration unit are timer based, with the defrost intervals set for the worst case scenario of a hot, humid summer day. This can therefore lead to a considerable waste of energy, because timers are not usually optimized in a way to minimize the energy consumed.
  • timers are not usually optimized in a way to minimize the energy consumed.
  • In order to melt any ice accumulated on the evaporator it is necessary to raise the temperature of the surrounding air above 0°C.
  • a supermarket coffin-type freezer normally operating with an air temperature around -22 °C a considerable amount of energy is needed to raise the air temperature above 0°C to allow the accumulated ice to melt.
  • product temperature i.e.; the temperature of product refrigerated in the unit
  • the refrigeration cycle can resume using the compressors to remove all of the introduced heat and return the product to normal operating temperature. Termination of the defrost cycle can be either temperature or time based depending on the application.
  • a refrigeration control system for controlling the refrigeration of a refrigeration unit having a refrigeration space.
  • the refrigeration control system includes a sensor unit.
  • the sensor unit includes first and second resistance temperature detectors mounted within the refrigeration space and electrically connected to a control unit.
  • the first resistance temperature detector is thermally joined to the second resistance temperature detector and electrically insulated from the second resistance temperature detector.
  • the control unit includes a resistance signal receiver for receiving an initial resistance signal from the second resistance temperature detector, and a converter for converting the initial resistance signal to an initial resistance value.
  • the control unit also includes a current controller for increasing the current in the first resistance temperature detector from an initial current level to a final current level, and a resistance controller for increasing the resistance of the second resistance temperature detector from the initial resistance value to a pre-defined resistance value.
  • the control unit further includes a processor for calculating the flow rate of air across the sensor unit based upon the increase in current of the first resistance temperature detector from the initial current value to the final current value, and the increase in resistance of the second resistance temperature detector from the initial resistance value to the pre-defined resistance value.
  • the control unit includes a defrost cycle controller for controlling the defrost cycle of the refrigeration unit dependent upon the calculated flow rate of air across the sensor unit.
  • control unit is preferably configured to use various power levels, switching to a higher level of current (i.e.; a higher final current level) if the rate of resistance change (from the initial resistance to the pre-defined resistance value) is not sufficiently fast enough to give an accurate air speed reading quickly.
  • the control system preferably includes software to facilitate any adjustment necessary in the final current level to enable the flow rate of air to be accurately calculated.
  • control unit includes a fan controller for controlling operation of an evaporator fan.
  • the fan controller preferably controls operation of the evaporator fan in response to or dependent upon the calculated flow rate of air across the sensor unit.
  • the resistance signal receiver is provided for receiving a further signal from at least one of the first and second resistance temperature detectors. Further, the converter is provided for converting the further signal to a further resistance value, and the processor is provided for calculating the temperature of air flowing across the sensor unit based on the further resistance value.
  • each of the first and second resistance temperature detectors may extend longitudinally within the refrigeration space. More specifically, each of the first and second resistance temperature detectors may extend adjacent or proximate to the inner surface of at least one wall defining the refrigeration space. In this way, the first and second temperatures may be configured for providing average resistance readings (and therefore average air speed readings) over their lengths which, in at least one form, may correspond approximately to the respective refrigerator length.
  • the first and second resistance temperature detectors may adopt any suitable shape and/or configuration.
  • the sensor unit may be incorporated into or integrated with another refrigeration unit and/or control system component such as, for example, a fan mounting bracket.
  • control unit includes a processing unit such as, for example, a microprocessor.
  • the control unit may include a heater controller for controlling the temperature of a defrost heater(s) located within the refrigeration space to melt the accumulation of any ice. More preferably, however, the defrost heater(s) may be switched on or off with no intermediate control.
  • the control unit may include an output display.
  • An alarm may be provided for activation by the control unit upon the flow rate of air across the sensor unit decreasing to an alarm activation level, thereby providing an audible, visual or other warning to facilitate the servicing, maintenance and/or repair of the control system and/or refrigeration unit.
  • the control unit may include a timer or other suitable means for deactivating a defrost cycle after a pre-defined time interval.
  • the control unit preferably includes an inlet port for receiving inputted control unit operating parameters.
  • the inlet port may be configured for either wired or wireless connection.
  • the inputted operating parameters may include any one or more of the pre-defined resistance value, a timer time interval setting, and a heater controller power output setting.
  • the control unit may include any one or more other inputted operating parameters, if required or desired.
  • inputted control unit operating parameters may be inputted via a touch screen, or via an input panel including buttons or the like and an associated screen.
  • each of the first and second resistance temperature detectors includes a conductive pathway on a printed circuit board. It is envisaged that the conductive pathway of the first resistance temperature detector and the conductive pathway of the second resistance temperature detector would be provided on the printed circuit board in a generally parallel configuration. Indeed, each of the first and second resistance temperature detectors may include multiple pathways provided on the printed circuit board in a generally parallel configuration.
  • the processor is configured to calculate the average flow rate of air across the longitudinally extending printed circuit board rather than at a single location along the circuit board, thereby potentially providing a more accurate air flow rate calculation over the entire length of the refrigeration space.
  • the printed circuit board is preferably mounted within the refrigeration space behind a panel, thereby being protected from damage including that which may be sustained when placing goods into or removing goods from the refrigeration space.
  • the present invention has, thus far, been generally defined in terms of a control system. However, it is to be appreciated that the invention also extends to a refrigeration unit including a refrigeration control system as previously defined.
  • the present invention further extends to a method of using a refrigeration control system and refrigeration unit as defined previously.
  • Figure 1 is a diagrammatic side view of a refrigerator unit including a refrigeration control system in accordance with one aspect of the present invention.
  • Figure 2 is a diagrammatic front view of the first and second resistance temperature detectors of the refrigeration control system illustrated in Figure 1.
  • Figure 3 is a plan view of one embodiment of a control unit for use in a refrigeration control system of the type illustrated in Figure 1.
  • Figure 4 is a perspective view of one embodiment of a digital output display for use in a refrigeration control system of the type illustrated in Figure 1.
  • Figure 5 is a plan view of one embodiment of a sensor unit for use in a refrigeration control system of the type illustrated in Figure 1.
  • Figure 6 is a magnified view of a portion of the sensor unit illustrated in Figure 4.
  • Figure 7 is a another magnified view of a portion of the sensor unit illustrated in Figure 4.
  • the unit 10 may adopt any suitable form, and in the illustrated form is a coffin-type freezer as used in-store in supermarkets for refrigerating frozen produce.
  • the refrigeration unit 10 includes a refrigeration space 12 for refrigerating product therein, the unit 10 having an upwardly facing access opening 14 for accessing the space 12.
  • the evaporator fan 26 circulates the chilled air within the refrigeration space 12 in an anti-clockwise direction as indicated by the arrows.
  • the refrigeration unit 10 includes a refrigeration control system for controlling the refrigeration of the unit 10.
  • the refrigeration control system includes a sensor unit 16.
  • the sensor unit 16 includes first and second resistance temperature detectors 18,20 mounted within the refrigeration space and electrically connected to a control unit 22 (see Figure 3).
  • the first and second resistance temperature detectors 18,20 are illustrated in greater detail in Figures 5 to 7. Each of the first and second resistors 18, 20 are provided in a generally parallel arrangement on both sides of the circuit board 32.
  • the first resistance temperature detector 18 is thermally joined to the second resistance temperature detector 20 and electrically insulated from the second resistance temperature detector 20. Provision of each of the two detectors 18, 20 on both sides of the circuit board 32 has been found to be a particularly effective arrangement.
  • the control unit 22 includes a processor in the form of a microprocessor (not clearly illustrated).
  • the microprocessor provides a number of distinct control unit operations for operation of the refrigeration control system.
  • the microprocessor operates as a resistance signal receiver for receiving an initial resistance signal from the second resistance temperature detector 20, and a converter for converting the initial resistance signal to an initial resistance value.
  • the microprocessor also operates as a current controller for increasing the current in the first resistance temperature detector 18 from an initial current level to a final current level, and as a resistance controller for increasing the resistance of the second resistance temperature detector 20 from the initial resistance value to a pre-defined resistance value.
  • the microprocessor further operates as a processor for calculating the flow rate of air across the sensor unit 16 based upon the increase in current of the first resistance temperature detector 18 from the initial current value to the final current value, and the increase in resistance of the second resistance temperature detector 20 from the initial resistance value to the pre-defined resistance value.
  • the control unit 22 further functions as a defrost cycle controller for controlling the defrost cycle of the refrigeration unit 10 dependent upon the flow rate of air across the sensor unit 16 calculated by the microprocessor. More specifically, the control unit 22 controls operation of resistive heater elements 24 dependent upon the flow rate of air across the sensor unit 16 as calculated by the microprocessor. This may occur by way of a relay output, which communicates to an existing temperature/defrost controller that defrosting conditions have been met, that there is low air speed due to the formation of ice on the heat exchangers. In a more advanced form, the control unit 22 may control the temperature and defrost heaters inside the freezer with relay outputs to cycle a compressor, solenoid valve and heater banks.
  • the control unit 22 still further functions as a fan controller for controlling operation of an evaporator fan 26 in response to or dependent upon the flow rate of air across the sensor unit 16 as calculated by the microprocessor. It is to be appreciated that more than one evaporator fan 26 may be provided, in which case the control unit 22 may control operation of the evaporator fans either independently or collectively.
  • the microprocessor is also configured for receiving a further signal from at least one of the first and second resistance temperature detectors 18,20, and for converting the further signal to a further resistance value, from which the microprocessor calculates the temperature of air flowing across the sensor unit 16 based on the further resistance value.
  • Each of the first and second resistance temperature detectors 18,20 includes separate and distinct conductive pathways 28,30 provided on both sides of a printed circuit board 32 (see Figures 5 to 7).
  • the conductive pathways 28 of the first resistance temperature detector 18 and the conductive pathways 30 of the second resistance temperature detector 20 are provided on the printed circuit board 32 in a generally parallel configuration. In particularly long refrigerated units it may be useful to include two or more circuit boards arranged longitudinally, with each board including first and second resistance temperature detectors.
  • the printed circuit board 32 and the pathways 28,30 provided thereon extend longitudinally within the refrigeration space 12, between the upstanding wall 34 and the outer insulation layer 36 of the refrigeration unit 10.
  • the printed circuit board 32 Being mounted in this position, the printed circuit board 32 is protected from damage including that which may be sustained when placing goods into or removing goods from the refrigeration space 12.
  • the pathways 28,30 may be manufactured open ended (such that the left- hand end of the board 32 illustrated in Fig. 5 is duplicated on the right-hand end of the board) such that multiple sensor units 16 can be connected together end-to-end if required.
  • At either end of the printed circuit board 32 there are provided four connectors 38a,b,c,d.
  • the connectors 38a,c are attached to pathway 28 and the connectors 38b, d are attached to the pathway 30.
  • wires 40a are connected to the connectors at the left- hand end of the board 32, connecting the respective pathways 28,30 to corresponding pathways of an adjacent board (not visible).
  • Wires 40b are connected to the connectors at the right-hand end of the board in order to close (or complete) the pathways 28, 30 at the right-hand end. It is to be appreciated that the connectors 38a,b,c,d allow the number and configuration of sensor units 16 to be varied to suit a specific application.
  • the pathways 28,30 are not open ended (that is, they are of the form shown in Fig. 5 with the left and right-hand ends as illustrated), as it is preferred that each detector 18,20 be read separately to cancel out or at least address any change in ambient temperature.
  • the control unit 22 also functions as a heater controller for controlling the temperature of a heater (not illustrated) located within the refrigeration space 12.
  • control unit 22 includes a separate digital output display (not illustrated) 42 which is configured to be mounted within a recess provided in a housing (not illustrated) 4 .
  • the refrigeration control system includes an alarm for activation by the control unit 22 upon the flow rate of air across the sensor unit 16 decreasing to an alarm activation level, thereby providing an audible, visual or other warning to facilitate the servicing, maintenance and/or repair of the control system 16 and/or unit 10.
  • the control unit 22, or more specifically the microprocessor, also includes a timer for deactivating a defrost cycle after a pre-defined time interval.
  • control unit 22 includes an inlet port for the microprocessor to receive inputted control unit operating parameters.
  • the inlet port may be configured for either wired or wireless connection.
  • the inputted operating parameters may include any one or more of the pre-defined resistance value, a timer time interval setting, a heater controller power output setting, and any other operating parameter that may need to be inputted into the microprocessor.
  • the printed circuit board 32 (or multiple circuit boards extending end-to-end) and therefore each of the first and second resistance temperature detectors 18,20 extend generally along the length of the refrigeration space 12, such that the processor calculates the average flow rate of air across the longitudinally extending resistance temperature detectors 18,20, rather than at a single location within the refrigeration unit 12.
  • the unit 10 may be of any suitable length. It is to be appreciated, however, that the invention may be adapted to include a single sensor (in the form of a printed circuit board 32) of any size and shape, or may include a multiple sensor configuration, again, of any size and shape.
  • the applicant has found that changing the ambient temperature during an airspeed measurement can affect the calculated airspeed.
  • the time taken to measure an air speed can be around one to two minutes and during that time the ambient temperature may change.
  • it may be difficult (if not impossible) in many circumstances to measure the change in the ambient temperature with only one sensor (in the form of a printed circuit board) as it is being heated.
  • it may be possible to calculate the expected rate of change and apply that to an air speed algorithm in order to eliminate any error introduced, it is preferable to use more than one sensor.
  • the applicant has found that using a minimum of two sensors can work effectively. One is heated to measure the air speed and the second to measure the changing ambient temperature, which is then used to nullify the effect it has on the air speed reading.
  • the two sensors are most preferably of the same type and construction, both with pathways 28,30; and the sensor used to calculate the air speed is preferably swapped each time a measurement is made.
  • the sensor that is heated and used to measure the airspeed could be sensor a, b or c and may be changed each time an airspeed measurement is performed.
  • the microprocessor periodically receives a resistance signal (previously referred to as 'an initial resistance signal') from the second resistance temperature detector 20, and converts the initial resistance signal to an initial resistance value.
  • a resistance signal previously referred to as 'an initial resistance signal'
  • the microprocessor increases the current in the first resistance temperature detector 18 from a known initial current level to a final current level and, at the same time, increases the resistance of the second resistance temperature detector 20 from the initial known resistance value to a pre-defined resistance value.
  • the microprocessor then calculates the average flow rate of air across the sensor unit 16 based upon the increase in current of the first resistance temperature detector 18 from the initial current value to the final current value, together with the increase in resistance of the second resistance temperature detector 20 from the initial resistance value to the pre-defined resistance value.
  • the microprocessor determines that average flow rate of air is lower than a preprogrammed threshold (because of, for example, a build-up of ice on the evaporator coil fins) then it will initiate the defrost cycle of the refrigeration unit 10. This includes the microprocessor activating the resistive heater elements 24, such that heated air flows to the evaporator coil fins to defrost the build-up of ice thereon. It is to be appreciated that the invention need not include heating elements such as, for example, in a dairy milk fridge where a defrost could be accomplished simply by turning off the refrigeration.
  • the microprocessor may also reduce the evaporator fan speed (or deactivate the fan entirely).
  • the processor may then terminate the defrost cycle by, for example, a time- based calculation, a temperature-based calculation, or by a wind speed calculation.
  • a temperature-based calculation is readily ascertainable, since the measured resistance of each of the first and second resistance temperature detectors 18,20 is proportional to its respective temperature.
  • the microprocessor is preferably programmed to calculate the air-speed within the unit 10 frequently enough to ensure that product within the refrigeration space 12 remains suitably refrigerated.
  • a suitable frequency may be every 5 to 10 minutes.
  • the use of resistance temperature detectors does generate a small amount of heat into the refrigeration space 12 and so the frequency of air-speed calculations should be limited accordingly.
  • an alarm may activate to indicate that the unit 10 requires maintenance and/or repair.
  • the present invention provides a unique control system that operates based on the flow rate of air within the refrigeration unit. It is also relatively simple and easy to install within a refrigeration unit.
  • the present invention is advantageously capable of periodic defrosting of refrigerator unit heat exchangers to ensure optimum air flow, which ensures proper product temperature control.
  • the invention is capable of measuring low air flow rates associated with typical refrigerating units, these being generally less than 0.5 m/s.
  • the present invention provides a unique control system for a refrigeration unit capable of switching to a defrost mode only when the build up of ice on the evaporative coil fins is sufficient to necessitate it, thereby potentially increasing the efficiency of the refrigeration unit as a whole.
  • control system of the present invention can also be relatively easily integrated with existing unit controls, and can be largely maintenance free.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)

Abstract

L'invention concerne un système de commande de réfrigération pour commander la réfrigération d'une unité de réfrigération ayant un espace de réfrigération. Le système de commande de réfrigération comprend une unité de détection (16). L'unité de détection (16) comprend des premier et second détecteurs de température de résistance (18, 20) montés dans l'espace de réfrigération et électriquement connectés à une unité de commande (22). Le premier détecteur de température de résistance (18) est lié thermiquement au second détecteur de température de résistance (20) et électriquement isolé du second détecteur de température de résistance (20). L'unité de commande (22) comprend un récepteur de signal de résistance pour recevoir un signal de résistance initial provenant du second détecteur de température de résistance (20), et un convertisseur pour convertir le signal de résistance initial en une valeur de résistance initiale. L'unité de commande (22) comprend également un contrôleur de courant pour augmenter le courant dans le premier détecteur de température de résistance (18) d'un niveau de courant initial à un niveau de courant final, et un contrôleur de résistance pour augmenter la résistance du second détecteur de température de résistance (20) de la valeur de résistance initiale à une valeur de résistance prédéfinie. L'unité de commande (22) comprend en outre un processeur pour calculer le débit d'air à travers l'unité de détection (16) sur la base de l'augmentation de courant du premier détecteur de température de résistance (18) de la valeur de courant initiale à la valeur de courant finale, et de l'augmentation de résistance du second détecteur température de résistance (20) de la valeur de résistance initiale à la valeur de résistance prédéfinie. En outre, l'unité de commande (22) comprend un contrôleur de cycle de dégel pour commander le cycle de dégel de l'unité de réfrigération en fonction du débit calculé de l'air à travers l'unité de détection (16).
PCT/AU2008/000295 2007-03-09 2008-03-05 Système de commande de réfrigération WO2008109927A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2008226387A AU2008226387B2 (en) 2007-03-09 2008-03-05 A refrigeration control system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2007901281 2007-03-09
AU2007901281A AU2007901281A0 (en) 2007-03-09 A Refrigeration Control System

Publications (1)

Publication Number Publication Date
WO2008109927A1 true WO2008109927A1 (fr) 2008-09-18

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Application Number Title Priority Date Filing Date
PCT/AU2008/000295 WO2008109927A1 (fr) 2007-03-09 2008-03-05 Système de commande de réfrigération

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AU (1) AU2008226387B2 (fr)
WO (1) WO2008109927A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011020800A3 (fr) * 2009-08-21 2011-12-08 BSH Bosch und Siemens Hausgeräte GmbH Appareil frigorifique notamment appareil frigorifique ménager et procédé pour le faire fonctionner
WO2012108996A3 (fr) * 2011-02-07 2012-12-13 Electrolux Home Products, Inc. Élément chauffant de dégivrage à puissance variable
EP3764032A4 (fr) * 2018-03-08 2021-12-01 LG Electronics Inc. Réfrigérateur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4831833A (en) * 1987-07-13 1989-05-23 Parker Hannifin Corporation Frost detection system for refrigeration apparatus
DE4115891A1 (de) * 1990-05-22 1991-11-28 Zeltron Spa Umluft-kuehlgeraet
EP0676603A2 (fr) * 1994-04-11 1995-10-11 Control and Regulation Circuits Meitav Ltd. Système de commande de dégivrage
US6467282B1 (en) * 2000-09-27 2002-10-22 Patrick D. French Frost sensor for use in defrost controls for refrigeration
US20070006600A1 (en) * 2003-04-04 2007-01-11 Bsh Bosch Und Siemens Hausgeråte Gmbh Refrigeration device with adaptive automatic defrosting and corresponding defrosting method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4831833A (en) * 1987-07-13 1989-05-23 Parker Hannifin Corporation Frost detection system for refrigeration apparatus
DE4115891A1 (de) * 1990-05-22 1991-11-28 Zeltron Spa Umluft-kuehlgeraet
EP0676603A2 (fr) * 1994-04-11 1995-10-11 Control and Regulation Circuits Meitav Ltd. Système de commande de dégivrage
US6467282B1 (en) * 2000-09-27 2002-10-22 Patrick D. French Frost sensor for use in defrost controls for refrigeration
US20070006600A1 (en) * 2003-04-04 2007-01-11 Bsh Bosch Und Siemens Hausgeråte Gmbh Refrigeration device with adaptive automatic defrosting and corresponding defrosting method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011020800A3 (fr) * 2009-08-21 2011-12-08 BSH Bosch und Siemens Hausgeräte GmbH Appareil frigorifique notamment appareil frigorifique ménager et procédé pour le faire fonctionner
WO2012108996A3 (fr) * 2011-02-07 2012-12-13 Electrolux Home Products, Inc. Élément chauffant de dégivrage à puissance variable
US9127875B2 (en) 2011-02-07 2015-09-08 Electrolux Home Products, Inc. Variable power defrost heater
EP3764032A4 (fr) * 2018-03-08 2021-12-01 LG Electronics Inc. Réfrigérateur
US11530866B2 (en) 2018-03-08 2022-12-20 Lg Electronics Inc. Refrigerator

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Publication number Publication date
AU2008226387A1 (en) 2008-09-18
AU2008226387B2 (en) 2011-09-01

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