EP4148356A1 - Réfrigérateur - Google Patents

Réfrigérateur Download PDF

Info

Publication number
EP4148356A1
EP4148356A1 EP21800170.9A EP21800170A EP4148356A1 EP 4148356 A1 EP4148356 A1 EP 4148356A1 EP 21800170 A EP21800170 A EP 21800170A EP 4148356 A1 EP4148356 A1 EP 4148356A1
Authority
EP
European Patent Office
Prior art keywords
operation mode
defrost
heater
controller
temperature
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.)
Pending
Application number
EP21800170.9A
Other languages
German (de)
English (en)
Other versions
EP4148356A4 (fr
Inventor
Youngseung SONG
Yunsu Cho
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 KR1020200054355A external-priority patent/KR20210136307A/ko
Priority claimed from KR1020200054356A external-priority patent/KR20210136308A/ko
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP4148356A1 publication Critical patent/EP4148356A1/fr
Publication of EP4148356A4 publication Critical patent/EP4148356A4/fr
Pending legal-status Critical Current

Links

Images

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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating
    • 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
    • F25D2700/10—Sensors measuring the temperature of the evaporator

Definitions

  • the present disclosure relates to a refrigerator, and more particularly, to a refrigerator capable of improving defrosting efficiency and power consumption.
  • a refrigerator temperature is reduced using a compressor and an evaporator.
  • a freezer compartment in the refrigerator is maintained at a temperature of approximately -18 °C.
  • Prior Document 1 Korean Patent Application Laid-Open No. 10-2001-0026176 (hereinafter, referred to as Prior Document 1) relates to a method for controlling a defrost heater of a refrigerator, in which the defrost heater is turned on when a certain time for defrosting arrives, and turned off after the lapse of a certain period of time.
  • U.S. Patent Publication No. US6694754 (hereinafter, referred to as Prior Document 2) relates to a refrigerator having a pulse-based defrost heater, disclosing that the On and off time of a defrost heater is determined based on time.
  • Prior Document 3 Korean Patent Application Laid-Open No. 10-2016-0053502 (hereinafter, referred to as Prior Document 3) relates to a defrosting device, a refrigerator having the same, and a control method of the defrosting device, in which the On and off time of a defrost heater determined based on time or time and temperature.
  • An aspect of the present disclosure provides a refrigerator capable of improving defrosting efficiency and power consumption.
  • a refrigerator includes: an evaporator configured to perform heat exchange; a defrost heater configured to operate to remove frost formed on the evaporator; a temperature sensor configured to detect an ambient temperature of the evaporator; and a controller configured to control the defrost heater, in which, in response to a defrosting operation start time point arriving, the controller is configured to perform a defrost operation mode including a pre-defrost cooling mode, a heater operation mode, and a post-defrost cooling mode, perform a continuous operation mode in which the defrost heater is continuously turned on based on the heater operation mode, and in response to a temperature change rate detected by the temperature sensor sequentially increasing, decreasing, and increasing again while performing the continuous operation mode, perform a pulse operation mode, in which the defrost heater is repeatedly turned on and off.
  • a defrost operation mode including a pre-defrost cooling mode, a heater operation mode, and a post-defrost cooling mode
  • the controller may be configured to perform the pulse operation mode after the defrost heater is turned off.
  • the controller may be configured to continuously perform the pulse operation mode.
  • the controller may perform the pulse operation mode and sequentially decrease an ON period of the defrost heater.
  • the controller may be configured to terminate the pulse operation mode and turn off the defrost heater in response to exceeding the first reference value while performing the pulse operation mode.
  • the controller may be configured to terminate the pulse operation mode and perform the continuous operation mode again in response to less than the second reference value while performing the pulse operation mode.
  • the controller may be configured to control a duration of the continuous operation mode to be less than a duration of the continuous operation mode before the pulse operation mode.
  • the controller may perform the defrost operation mode including the pre-defrosting cooling mode, the heater operation mode, and the post-defrosting cooling mode, and perform the continuous operation mode of the defrost heater, and the pulse operation mode, in which the defrost heater is repeatedly turned on and off, based on the heater operation mode.
  • the controller may be configured to, as the number of opening times of the cooling compartment door increases, decrease a duration of the defrost operation mode.
  • the controller may be configured to control a peak temperature arrival time point of the evaporator in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be later than the peak temperature arrival time point of the evaporator in response to the defrost heater being only continuously turned on in the defrost operation mode.
  • the controller may be configured to control a size of a second section related to temperature versus time between the defrost end temperatures at a phase change temperature in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be greater than a size of a first section related to temperature versus time between the defrost end temperatures at the phase change temperature in response to the defrost heater being only continuously turned on.
  • the controller may be configured to control an effective defrost in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be larger than the effective defrost in response to the defrost heater being only continuously performed in the defrost operation mode.
  • the controller may be configured to control a heater OFF time point in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be later than the heater OFF time point in response to the defrost heater being only continuously turned on in the defrost operation mode.
  • the controller may be configured to control a size of an overheat temperature region higher than the defrosting end temperature in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be less than a size of the overheat temperature region higher than the defrost end temperature in response to the defrost heater being only continuously performed in the defrost operation mode.
  • the controller may be configured to control a cooling power supply time point according to a normal cooling operation mode in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be later than the cooling power supply time point according to the normal cooling operation mode in response to the defrost heater being only continuously turned on in the defrost operation mode.
  • a refrigerator in another aspect, includes: an evaporator configured to perform heat exchange; a defrost heater configured to operate to remove frost formed on the evaporator; a temperature sensor configured to detect an ambient temperature of the evaporator; and a controller configured to control the defrost heater, in which, in response to a defrosting operation start time point arriving, the controller is configured to perform a defrost operation mode including a pre-defrost cooling mode, a heater operation mode, and a post-defrost cooling mode, perform a continuous operation mode in which the defrost heater is continuously turned on based on the heater operation mode, and after the continuous operation mode ends, before the pulse operation mode in which the defrost heater is repeatedly turned on and off, in response to the temperature detected by the temperature sensor reaching the defrosting end temperature, the controller is configured to turn on and off the defrost heater at least once after the defrosting end temperature arrives.
  • a defrost operation mode including a pre-defrost cooling mode
  • the controller may be configured to terminate the heater operation mode after performing the turn on and off at least once, and perform the post-defrost cooling mode.
  • the controller may be configured to turn off the defrost heater in response to the temperature detected by the temperature sensor reaching the defrosting end temperature during the continuous operation mode.
  • the controller may be configured to perform a pulse operation mode in which the defrost heater is repeatedly turned on and off after the continuous operation mode ends, and turn off the defrost heater in response to the temperature detected by the temperature sensor reaching the defrosting end temperature during the continuous operation mode.
  • a refrigerator includes: an evaporator configured to perform heat exchange; a defrost heater configured to operate to remove frost formed on the evaporator; a temperature sensor configured to detect an ambient temperature of the evaporator; and a controller configured to control the defrost heater, in which, in response to a defrosting operation start time point arriving, the controller is configured to perform a defrost operation mode including a pre-defrost cooling mode, a heater operation mode, and a post-defrost cooling mode, perform a continuous operation mode in which the defrost heater is continuously turned on based on the heater operation mode, and in response to a temperature change rate detected by the temperature sensor sequentially increasing, decreasing, and increasing again while performing the continuous operation mode, perform a pulse operation mode, in which the defrost heater is repeatedly turned on and off. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption. In particular, since the defrosting is performed according to the amount of frost of the actual
  • the controller may be configured to perform the pulse operation mode after the defrost heater is turned off. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to continuously perform the pulse operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may perform the pulse operation mode and sequentially decrease an ON period of the defrost heater. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to terminate the pulse operation mode and turn off the defrost heater in response to exceeding the first reference value while performing the pulse operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to terminate the pulse operation mode and perform the continuous operation mode again in response to less than the second reference value while performing the pulse operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to control a duration of the continuous operation mode to be less than a duration of the continuous operation mode before the pulse operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may perform the defrost operation mode including the pre-defrosting cooling mode, the heater operation mode, and the post-defrosting cooling mode, and perform the continuous operation mode of the defrost heater, and the pulse operation mode, in which the defrost heater is repeatedly turned on and off, based on the heater operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to, as the number of opening times of the cooling compartment door increases, decrease a duration of the defrost operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to control a peak temperature arrival time point of the evaporator in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be later than the peak temperature arrival time point of the evaporator in response to the defrost heater being only continuously turned on in the defrost operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to control a size of a second section related to temperature versus time between the defrost end temperatures at a phase change temperature in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be greater than a size of a first section related to temperature versus time between the defrost end temperatures at the phase change temperature in response to the defrost heater being only continuously turned on. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to control such that an effective defrost in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be larger than the effective defrost in response to the defrost heater being only continuously performed in the defrost operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to control a heater OFF time point in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be later than the heater OFF time point in response to the defrost heater being only continuously turned on in the defrost operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to control a size of an overheat temperature region higher than the defrosting end temperature in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be less than a size of the overheat temperature region higher than the defrost end temperature in response to the defrost heater being only continuously performed in the defrost operation mode. Accordingly, it is possible to improve the defrosting efficiency and power consumption in response to performing the continuous operation mode and the pulse operation mode.
  • the controller may be configured to control a cooling power supply time point according to a normal cooling operation mode in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode to be later than the cooling power supply time point according to the normal cooling operation mode in response to the defrost heater being only continuously turned on in the defrost operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption. Accordingly, it is possible to improve the defrosting efficiency and power consumption in response to performing the continuous operation mode and the pulse operation mode.
  • the controller may be configured to turn on and off the defrost heater at least once after the defrosting end temperature arrives. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption. In particular, since the defrosting is performed according to the amount of frost of the actual evaporator, it is possible to improve defrosting efficiency and power consumption.
  • a refrigerator includes: an evaporator configured to perform heat exchange; a defrost heater configured to operate to remove frost formed on the evaporator; a temperature sensor configured to detect an ambient temperature of the evaporator; and a controller configured to control the defrost heater, in which, in response to a defrosting operation start time point arriving, the controller is configured to perform a defrost operation mode including a pre-defrost cooling mode, a heater operation mode, and a post-defrost cooling mode, perform a continuous operation mode in which the defrost heater is continuously turned on based on the heater operation mode, and after the continuous operation mode ends, before the pulse operation mode in which the defrost heater is repeatedly turned on and off, in response to the temperature detected by the temperature sensor reaching the defrosting end temperature, the controller is configured to turn on and off the defrost heater at least once after the defrosting end temperature arrives. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to terminate the heater operation mode after performing the turn on and off at least once, and perform the post-defrost cooling mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to turn off the defrost heater in response to the temperature detected by the temperature sensor reaching the defrosting end temperature during the continuous operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller may be configured to perform a pulse operation mode in which the defrost heater is repeatedly turned on and off after the continuous operation mode ends, and turn off the defrost heater in response to the temperature detected by the temperature sensor reaching the defrosting end temperature during the continuous operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • FIG. 1 is a perspective view illustrating a refrigerator according to an embodiment of the present disclosure.
  • a refrigerator 100 forms a rough outer shape by a case 110 having an internal space divided, although not shown, into a freezer compartment and a refrigerating compartment, a freezer compartment door 120 that shields the freezer compartment, and a refrigerator door 140 to shield the refrigerating compartment.
  • the front surface of the freezer compartment door 120 and the refrigerating compartment door 140 is further provided with a door handle 121 protruding forward, a user easily grips and rotates the freezer compartment door 120 and the refrigerating compartment door 140.
  • the front surface of the refrigerating compartment door 140 may be further provided with a home bar 180 which is a convenient means for allowing a user to take out a storage such as a beverage contained therein without opening the refrigerating compartment door 140.
  • the front surface of the freezer compartment door 120 may be provided with a dispenser 160 which is a convenient means for allowing the user to easily take out ice or drinking water without opening the freezer compartment door 120, and a control panel 210 for controlling the driving operation of the refrigerator 100 and displaying the state of the refrigerator 100 being operated on a screen may be further provided in an upper side of the dispenser 160.
  • the dispenser 160 is disposed in the front surface of the freezer compartment door 120, but is not limited thereto, and may be disposed in the front surface of the refrigerating compartment door 140.
  • the control panel 210 may include an input device 220 formed of a plurality of buttons, and a display device 230 for displaying a control screen, an operation state, and the like.
  • the display device 230 displays information such as a control screen, an operation state, a temperature inside the refrigerator, and the like.
  • the display device 230 may display the set temperature of the freezer compartment and the set temperature of the refrigerating compartment.
  • the display device 230 may be implemented in various ways, such as a liquid crystal display (LCD), a light emitting diode (LED), an organic light emitting diode (OLED), and the like.
  • the display device 230 may be implemented as a touch screen capable of serving as the input device 220.
  • the input device 220 may include a plurality of operation buttons.
  • the input device 220 may include a freezer compartment temperature setting button (not shown) for setting the freezer compartment temperature, and a refrigerating compartment temperature setting button (not shown) for setting the refrigerating compartment temperature.
  • the input device 220 may be implemented as a touch screen that may also function as the display device 230.
  • the refrigerator according to an embodiment of the present disclosure is not limited to a double door type shown in the drawing, but may be a one door type, a sliding door type, a curtain door type, and the like regardless of its type.
  • FIG. 2 is a perspective view of a door of the refrigerator of FIG. 1 .
  • a freezer compartment 155 is disposed inside the freezer compartment door 120, and a refrigerating compartment 157 is disposed inside the refrigerating compartment door 140.
  • FIG. 3 is a view schematically illustrating a configuration of the refrigerator of FIG. 1 .
  • the refrigerator 100 may include a compressor 112, a condenser 116 for condensing a refrigerant compressed by the compressor 112, a freezer compartment evaporator 122 which is supplied with the refrigerant condensed in the condenser 116 to evaporate, and is disposed in a freezer compartment (not shown), and a freezer compartment expansion valve 132 for expanding the refrigerant supplied to the freezer compartment evaporator 122.
  • the refrigerator 100 may further include a refrigerating compartment evaporator (not shown) disposed in a refrigerating compartment (not shown), a three-way valve (not shown) for supplying the refrigerant condensed in the condenser 116 to the refrigerating compartment evaporator (not shown) or the freezer compartment evaporator 122, and a refrigerating compartment expansion valve (not shown) for expanding the refrigerant supplied to the refrigerating compartment evaporator (not shown).
  • a refrigerating compartment evaporator (not shown) disposed in a refrigerating compartment (not shown)
  • a three-way valve for supplying the refrigerant condensed in the condenser 116 to the refrigerating compartment evaporator (not shown) or the freezer compartment evaporator 122
  • a refrigerating compartment expansion valve not shown
  • the refrigerator 100 may further include a gas-liquid separator (not shown) which separates the refrigerant passed through the evaporator 122 into a liquid and a gas.
  • a gas-liquid separator (not shown) which separates the refrigerant passed through the evaporator 122 into a liquid and a gas.
  • the refrigerator 100 may further include a refrigerating compartment fan (not shown) and a freezer compartment fan 144 that suck cold air that passed through the freezer compartment evaporator 122 and blow the sucked cold air into a refrigerating compartment (not shown) and a freezer compartment (not shown) respectively.
  • the refrigerator 100 may further include a compressor driver 113 for driving the compressor 112, and a refrigerating compartment fan driver (not shown) and a freezer compartment fan driver 145 for driving the refrigerating compartment fan (not shown) and the freezer compartment 144.
  • a damper (not shown) may be installed between the refrigerating compartment and the freezer compartment, and a fan (not shown) may forcibly blow the cold air generated in one evaporator to be supplied to the freezer compartment and the refrigerating compartment.
  • FIG. 4 is a block diagram schematically illustrating the inside of the refrigerator shown in FIG. 1 .
  • the refrigerator of FIG. 4 includes a compressor 112, a machine room fan 115, the freezer compartment fan 144, a controller 310, a heater 330, a temperature sensor 320, and a memory 240, and an evaporator 122.
  • the refrigerator may further include a compressor driver 113, a machine room fan driver 117, a freezer compartment fan driver 145, a heater driver 332, a display device 230, and an input device 220.
  • the compressor 112 the machine room fan 115, and the freezer compartment fan 144 are described with reference to FIG. 2 .
  • the input device 220 includes a plurality of operation buttons, and transmits a signal for an input freezer compartment set temperature or refrigerating compartment set temperature to the controller 310.
  • the display device 230 may display an operation state of the refrigerator. Meanwhile, the display device 230 is operable under the control of a display controller (not shown).
  • the memory 240 may store data necessary for operating the refrigerator.
  • the memory 240 may store power consumption information for each of the plurality of power consumption devices. In addition, the memory 240 may output corresponding power consumption information to the controller 310 based on the operation of each power consumption device in the refrigerator.
  • the temperature sensor 320 detects a temperature in the refrigerator and transmits a signal for the detected temperature to the controller 310.
  • the temperature sensor 320 detects the refrigerating compartment temperature and the freezer compartment temperature respectively.
  • the temperature of each chamber in the refrigerating compartment or each chamber in the freezer compartment may be detected.
  • the controller may be configured to control the compressor driver 113, the fan driver 117 or 145, the heater driver 332 to eventually control the compressor 112, the fan 115 or 144, and the heater 330.
  • the fan driver may be the machine room fan driver 117 or the freezer compartment fan driver 145.
  • the controller 310 may output a corresponding speed command value signal to the compressor driver 113 or the fan driver 117 or 145 respectively.
  • the compressor driver 113 and the freezer compartment fan driver 145 described above are provided with a compressor motor (not shown) and a freezer compartment fan motor (not shown) respectively, and each motor (not shown) may be operated at a target rotational speed under the control of the controller 310.
  • the machine room fan driver 117 includes a machine room fan motor (not shown), and the machine room fan motor (not shown) may be operated at a target rotational speed under the control of the controller 310.
  • each motor may be controlled by a switching operation in an inverter (not shown) or may be controlled at a constant speed by using an AC power source intactly.
  • each motor may be any one of an induction motor, a Blush less DC (BLDC) motor, a synchronous reluctance motor (synRM) motor, and the like.
  • the controller 310 may be configured to control the overall operation of the refrigerator 100, in addition to the operation control of the compressor 112 and the fan 115 or 144.
  • the controller 310 may be configured to control the overall operation of the refrigerant cycle based on the set temperature from the input device 220.
  • the controller 310 may further control a three-way valve (not shown), a refrigerating compartment expansion valve (not shown), and a freezer compartment expansion valve 132, in addition to the compressor driver 113, the refrigerating compartment fan driver 143, and the freezer compartment fan driver 145.
  • the operation of the condenser 116 may also be controlled.
  • the controller 310 may be configured to control the operation of the display device 230.
  • the cold air heat-exchanged in the evaporator 122 may be supplied to the freezer compartment or the refrigerating compartment by a fan or a damper (not shown).
  • the heater 330 may be a freezer compartment defrost heater.
  • the freezer compartment defrost heater 330 may operate to remove frost attached to the freezer compartment evaporator 122.
  • the heater driver 332 may be configured to control the operation of the heater 330.
  • the controller 310 may be configured to control the heater driver 332.
  • the heater 330 may include a freezer compartment defrost heater and a refrigerating compartment defrost heater.
  • the freezer compartment defrost heater 330 may operates to remove frost attached to the freezer compartment evaporator 122
  • the refrigerating compartment defrost heater (not shown) may operate to remove frost attached to the refrigerating compartment evaporator.
  • the heater driver 332 may be configured to control the operations of the freezer compartment defrost heater 330 and the refrigerating compartment defrost heater.
  • FIG. 5A is a perspective view illustrating an example of an evaporator related to the present disclosure
  • FIG. 5B is a diagram referenced in the description of FIG. 5A .
  • the evaporator 122 in the refrigerator 100 may be a freezer compartment evaporator as described above with reference to FIG. 2 .
  • a sensor mounter 400 including a temperature sensor 320 may be attached to the evaporator 122 in the refrigerator 100.
  • a sensor mounter 400 is attached to an upper cooling pipe of the evaporator 122 in the refrigerator 100.
  • the evaporator 122 includes a cooling pipe 131 extending from one side of the accumulator 134 and a support 133 supporting the cooling pipe 131.
  • the cooling pipe 131 may be repeatedly bent in a zigzag manner to form multiple rows and may be filled with a refrigerant.
  • the defrost heater 330 for defrosting may be disposed in the vicinity of the cooling pipe 131 of the evaporator 122.
  • the defrost heater 330 is disposed in the vicinity of the cooling pipe 131 in a lower region of the evaporator 122.
  • frost ICE is formed from a lower region of the evaporator 122 and grows in an upward direction
  • the defrost heater 330 may be disposed in the vicinity of the cooling pipe 131 in the lower region of the evaporator 122.
  • the defrost heater 330 may be disposed in a shape surrounding the cooling pipe 131 of the lower region of the evaporator 122.
  • FIG. 5B illustrates frost ICE is attached to the evaporator 122.
  • frost ICE is attached to a central portion and a lower portion of the evaporator 122.
  • frost ICE is formed on the defrost heater 330 to cover the defrost heater 330.
  • frost ICE is removed from the lower region of the evaporator 122 and may be gradually removed in the direction of the central region.
  • FIG. 6 is a flowchart illustrating a method of operating a refrigerator according to an embodiment of the present disclosure.
  • the controller 310 of the refrigerator 100 determines whether a defrosting operation start time point for defrosting arrives (S610).
  • the controller 310 of the refrigerator 100 may determine whether a defrosting operation start time point arrives while performing a normal cooling operation mode Pga.
  • the defrosting operation start time point may vary according to a defrost cycle.
  • the amount of cold air supplied in the normal cooling operation mode increases, and accordingly, a rate at which frost is formed on the evaporator 122 may increase.
  • the controller 310 of the refrigerator 100 may be configured to control such that a defrost cycle is shortened.
  • the controller 310 of the refrigerator 100 may be configured to control the defrosting operation start time point to be shortened.
  • the controller 310 of the refrigerator 100 may be configured to terminate the normal cooling operation mode, control to perform a defrost operation mode PDF, and control the defrost heater 330 to be continuously turned on based on a heater operation mode PddT in the defrost operation mode PDF (S615).
  • the controller 310 of the refrigerator 100 may be configured to perform a pulse operation mode in which the defrost heater 330 is repeatedly turned on and off by a heater pulse after the defrost heater 330 is continuously turned on (S620).
  • the controller 310 of the refrigerator 100 may be configured to perform the defrost operation mode PDF including a pre-defrost cooling mode Pbd, a heater operation mode PddT, and a post-defrost cooling mode pbf.
  • the controller may be configured to perform a continuous operation mode Pona in which the defrost heater 330 is continuously turned on and a pulse operation mode Ponb in which the defrost heater 330 is repeatedly turned on and off.
  • the controller 310 controls the defrost heater 330 to be continuously turned on based on the continuous operation mode Pona, and in the ON state of the defrost heater 330, when a change rate of an ambient temperature of the evaporator 122 detected by the temperature sensor 320 is equal to or greater than a first reference value ref1, the controller 310 may enter the pulse operation mode Ponb to control the defrost heater 330 to be turned off. Accordingly, defrosting efficiency and power consumption may be improved.
  • the controller 310 of the refrigerator 100 may be configured to control the defrost heater 330 to be turned on and off based on a change rate of the temperature detected by the temperature sensor 320 when the pulse operation mode Ponb is performed.
  • the controller 310 of the refrigerator 100 may be configured to control the defrost heater 330 to be turned off, and if the change rate of the temperature detected by the temperature sensor 320 is less than or equal to a second reference value ref2 less than the first reference value ref1, the controller 310 may be configured to control the defrost heater 330 to be turned on. Accordingly, since defrosting may be performed based on a change rate ⁇ T of the temperature, defrosting efficiency and power consumption may be improved.
  • the controller 310 of the refrigerator 100 determines whether a pulse operation mode end time point arrives (S630), and if pulse operation mode end time point arrives, the controller 310 turn off the defrost heater 330 (S640).
  • the pulse operation mode end time point may be a time point at which the temperature detected by the temperature sensor 320 falls below a phase-change temperature Trf1.
  • the pulse operation mode end time point may be an end time point of the defrosting operation or an end time point of the heater operation mode.
  • the continuous operation mode Pona in which the defrost heater 330 is continuously turned on and the pulse operation mode in which the defrost heater 330 is repeatedly turned on and off are controlled to be performed based on the change rate of the temperature detected by the temperature sensor 320, defrosting efficiency and power consumption may be improved by performing defrosting based on the change rate ⁇ T of the temperature.
  • defrosting efficiency and power consumption may be improved.
  • FIGS. 7A to 13 are diagrams referenced in the description of FIG. 6 .
  • FIG. 7A is a diagram illustrating a defrost heater HT and a switching element RL for driving a defrost heater when one evaporator and one defrost heater are used in the refrigerator 100.
  • the freezer compartment defrost heater HT may operate to remove frost attached to the freezer compartment evaporator 122.
  • the switching element RL in the heater driver 332 may be configured to control the operation of the defrost heater HT.
  • the switching element RL may be a relay element.
  • the continuous operation mode Pona in which the defrost heater HT is continuously turned on may be performed, and when the switching element RL is switched On and off, the pulse operation mode Ponb in which the defrost heater HT is repeatedly turned on and off may be performed.
  • FIG. 7B is a diagram illustrating defrost heaters HTa and HTb and switching elements RLa and Rlb for driving the defrost heaters when two evaporators and two defrost heaters are used in the refrigerator 100.
  • a first switching element RLa in the heater driver 332 may be configured to control the operation of the first defrost heater HTa.
  • the first switching element RLa may be a relay element.
  • the continuous operation mode Pona in which the first defrost heater HTa is continuously turned on may be performed, and when the first switching element RLa performs On and off switching, the pulse operation mode Ponb in which the first defrost heater HTa is repeatedly turned on and off may be performed.
  • a second switching element RLb in the heater driver 332 may be configured to control the operation of the second defrost heater HTb.
  • the second switching element RLb may be a relay element.
  • the continuous operation mode Ponb in which the second defrost heater HTb is continuously turned on may be performed, and when the second switching element RLb performs On and off switching, the pulse operation mode Ponb in which the second defrost heater HTb is repeatedly turned on and off may be performed.
  • On and off timings of the first switching element RLa and the second switching element RLb may be different from each other. Accordingly, it is possible to perform the defrosting of the freezer compartment evaporator and the defrosting of the refrigerating compartment evaporator, separately.
  • FIG. 8A is a diagram illustrating an example of a pulse waveform indicating an operation of one defrost heater of FIG. 7A .
  • the horizontal axis of the pulse waveform Psh may represent time and the vertical axis may represent a level.
  • the controller 310 of the refrigerator 100 may be configured to terminate the normal cooling operation mode Pga and control to perform the defrost operation mode pdf.
  • the defrost operation mode pdf may include a pre-defrost cooling mode Pbd between Toa and Ta, a heater operation mode PddT between Ta and Td, and a post-defrost cooling mode pbf between Td and Te.
  • the defrost heater 330 is turned off in the normal cooling operation mode Pga and the normal cooling operation mode Pgb.
  • the defrost heater 330 may be turned off in the pre-defrost cooling mode Pbd and the post-defrost cooling mode pbf of the defrost operation mode PDF.
  • the defrost heater 330 may be continuously turned on in the continuous operation mode Pona of the heater operation mode PddT, and may be repeatedly turned on and off in the pulse operation mode Ponb of the heater operation mode PddT.
  • the continuous operation mode Pona may be performed between Ta and Tb, and the pulse operation mode Ponb may be performed between Tb and Tc.
  • the continuous operation mode Pona and the pulse operation mode Ponb are used in combination. Accordingly, defrosting efficiency and power consumption may be improved.
  • FIG. 8B is a diagram illustrating an example of a pulse waveform indicating an operation of two defrost heaters of FIG. 7B .
  • FIG. 8B shows a pulse waveform Psha indicating an operation of the freezer compartment defrost heater
  • Pshb indicating an operation of the refrigerating compartment defrost heater
  • the pulse waveform Psha of (a) of FIG. 8B may be the same as the pulse waveform Psh of FIG. 8A .
  • an operating section of the refrigerating compartment defrost heater may be less than an operating section of the freezer compartment defrost heater.
  • a period of continuously turning on in the continuous operation mode Pona in the heater operation mode PddT may be less than a period of the pulse waveform Psha of (a) of FIG. 8B .
  • an ON/OFF repetition period of the pulse operation mode Ponb in the heater operation mode PddT may be less than the pulse waveform Psha of (a) of FIG. 8B .
  • FIG. 9 is a diagram illustrating an example of cooling power supply and a defrost heater operation in the defrost operation mode pdf of FIG. 8A .
  • the defrost operation mode pdf may include a pre-defrost cooling mode Pbd between To and Ta, a heater operation mode PddT between Ta and Td, and a post-defrost cooling mode pbf between Td and Te.
  • a level of supplied cooling power may be an R level, and during a period T1 to T2, a level of cooling power may be an F level greater than the R level.
  • the cooling power supply may be stopped.
  • a level of supplied cooling power may be the R level.
  • cooling power supply for compensating for the stoppage of cooling power supply during the heater operation mode PddT is performed.
  • the cooling power supply may be performed by a compressor, a thermoelectric element, or the like, and in the drawings, it is illustrated that the cooling power supply is performed by an operation of the compressor.
  • the compressor operates, and during a period T2 to T3 in which cooling power is not supplied, the compressor is turned off.
  • the refrigerating compartment fan may operate and the freezer compartment fan may be turned off.
  • the refrigerating compartment fan may be turned off and the freezer compartment fan may be operated.
  • the defrost heater 330 should be maintained in an OFF state.
  • the defrost heater 330 may operate during the period of Ta to Tc in the period of Ta to Td of the heater operation mode PddT.
  • the continuous operation mode Pona may be performed during the period of Ta and Tb of the heater operation mode PddT period, and the heater operation mode PddT may be performed during the Tb and Tc periods.
  • the defrost heater 330 may be turned off from Tc, which is an end time point of the continuous operation mode Pona, to Td.
  • the compressor and the refrigerating compartment fan may be turned off.
  • the freezer compartment fan may be turned off.
  • the freezer compartment fan is turned off from Tc, which is the end time point of the continuous operation mode Pona, to Td.
  • the post-defrost cooling mode Pbf is performed.
  • a level of the supplied cooling power may be an R+F level, and the largest level of cooling power may be supplied.
  • a level of the supplied cooling power may be F level, and the cooling power supply may be stopped during the period T6 to Te.
  • the largest level of cooling power supply may be performed according to the stopping of the cooling power supply during the heater operation mode PddT.
  • the compressor operates, and the compressor is turned off during the period of T6 to Te in which cooling power is not supplied.
  • the refrigerating compartment fan and the freezer compartment fan may be turned off together.
  • the refrigerating compartment fan may be turned off and the freezer compartment fan may be operated.
  • the level of power consumption in the heater operation mode PddT in FIG. 9 may be greater than the level of power consumption of the R+F level cooling power.
  • FIG. 10 is a diagram illustrating temperature change waveforms of an evaporator in response to the defrost heater being operated only in the continuous operation mode and in response to the continuous operation mode and the pulse operation mode being mixed.
  • CVa represents a temperature change waveform in response to the defrost heater being operated only in the continuous operation mode
  • CVb represents a temperature change waveform in response to the defrost heater being operated by mixing the continuous operation mode and the pulse operation mode.
  • the defrost heater 330 is continuously turned on, and may be turned off at a time point Tx, as shown in (b) of FIG. 10 .
  • the defrost heater 330 operates during the Pohm period, as shown in (c) of FIG. 10 .
  • the continuous operation mode is performed, and the pulse operation mode is performed during a Pofn period from Tpa to Tpb.
  • Trf1 represents a phase-change temperature, and may be, for example, 0°C.
  • Trf2 represents a defrost end temperature, for example, may be 5°C.
  • Trf1 and Trf2 may indicate a defrosting region in which defrosting is actually performed, and a region exceeding Trf2 may indicate an overheating region in which excessive defrosting is performed.
  • a size of the overheating region is reduced and a size of the defrosting region is increased.
  • the continuous operation mode and the pulse operation mode of the defrost heater 300 are mixed in order to reduce the size of the overheating region and increase the size of the defrosting region.
  • the controller 310 may be configured to control a peak temperature arrival point Qd of the evaporator 122 when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be later than a peak temperature arrival point Qc of the evaporator 122 when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed.
  • the controller 310 may be configured to control a size of a second section Arbb related to a temperature versus time between a phase-change temperature Trf1 and a defrost end temperature Trf2 in response to the continuous operation mode and the pulse operation mode being performed in the defrost operation mode PDF to be greater than a size of a first section Arab related to a temperature versus time between the phase-change temperature Trf1 and the defrost end temperature Trf2 in response to the defrost heater being only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed.
  • the controller 310 may be configured to control an effective defrost when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be greater than an effective defrost when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed.
  • the controller 310 may be configured to control a heater OFF time point Tpb when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be later than a heater OFF time point Tx when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed.
  • the controller 310 may be configured to control a period Tpb-Qd between the heater OFF time point Tpb and a peak temperature arrival time Qd of the evaporator 122 when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be greater than a period Tx-Qc between the heater OFF time point and the peak temperature arrival time Qc of the evaporator 122 when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed.
  • the controller 310 may be configured to control a period Tpb-Qh during which a temperature maintains above the phase-change temperature Trf1 when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be greater than a period Tx-Qg during which a temperature maintains above the phase-change temperature Trf1 when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed
  • the controller 310 may be configured to control a period Tpb-Qh between the heater OFF time point Tpb to a time point at which a temperature falls below a phase-change temperature Trf1 when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be less than a period Tx-Qg between the heater OFF time point Tx to a time point Qg at which the temperature falls below the phase-change temperature Trf1 when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed.
  • the controller 310 may be configured to control a size of an overheat temperature region Arba equal to higher than the defrosting end temperature Trf2 when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be less than an overheat temperature region Araa equal to higher than the defrosting end temperature Trf2 when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF. Accordingly, it is possible to improve the defrosting efficiency and power consumption when the continuous operation mode Pona and the pulse operation mode Ponb are performed.
  • (d) shows a cooling power supply waveform COa in the case of only continuously turning on the defrost heater 330 and a cooling power supply waveform COb in the case of performing a continuous operation mode Pona and a pulse operation mode Ponb.
  • the controller 310 may be configured to control a cooling power supply time point Tcb according to a normal cooling operation mode Pga when the continuous operation mode Pona and the pulse operation mode Ponb are performed in the defrost operation mode PDF to be later than a cooling power supply time point Tca according to the normal cooling operation mode Pga when the defrost heater 330 is only continuously turned on in the defrost operation mode PDF.
  • FIG. 11 is a diagram illustrating an operating method in a pulse operation mode according to an embodiment of the present disclosure.
  • the controller 310 controls the defrost heater 330 to be turned on based on the heater operation mode, in particular, based on the continuous operation mode (S1115).
  • the controller 310 calculates a change rate ⁇ T of a temperature detected by the temperature sensor 320 during the operation of the defrost heater 330, and determines whether the change rate ⁇ T of the temperature is equal to or greater than a first reference value ref1 (S1120).
  • the controller 310 may be configured to control the defrost heater 330 to continuously operate.
  • the controller 310 may temporarily turn off the defrost heater 330 (S1125).
  • the controller 310 calculates the change rate ⁇ T of the temperature detected by the temperature sensor 320 after the defrost heater 330 is temporarily turned off, and determine whether the change rate ⁇ T of the temperature is less than or equal to a second reference value ref2 (S1128).
  • the controller 310 is configured to turn on the defrost heater. That is, the controller 310 controls to perform step S1115.
  • step S1128 after the defrost heater 330 is temporarily turned off, when the change rate ⁇ T of the temperature exceeds the second reference value ref2, the controller 310 determines a pulse operation mode end condition is met.
  • the controller 310 ends the pulse operation mode and controls the heater to be turned off (S1140).
  • the pulse operation mode end condition may correspond to the pulse operation mode time point.
  • the pulse operation mode end time point may be a time at which the temperature detected by the temperature sensor 320 falls below the phase-change temperature Trf1.
  • the pulse operation mode end time point may be an end time point of the defrosting operation or an end time point of the heater operation mode.
  • the controller 310 controls to perform the defrost operation mode PDF and controls to perform the continuous operation mode Pona in which the defrost heater 330 is continuously turned on and the pulse operation mode Ponb in which the defrost heater 330 is repeatedly turned on and off based on the defrost operation mode PDF, and in response to performing the pulse operation mode Ponb, the controller is configured to control the defrost heater 330 to be turned on and off based on the change rate ⁇ T of the temperature detected by the temperature sensor 320. Accordingly, since defrosting may be performed based on the change rate ⁇ T of the temperature, it is possible to improve defrost efficiency and power consumption.
  • the controller 310 may be configured to perform the continuous operation mode Pona or the pulse operation mode Ponb based on the change rate ⁇ T of the temperature detected by the temperature sensor 320. Accordingly, it is possible to improve the defrosting efficiency and power consumption.
  • the controller 310 may be configured to operate the heater with power inversely proportional to the change rate ⁇ T of the temperature detected by the sensor during the pulse operation mode Ponb. Accordingly, it is possible to improve the defrosting efficiency and power consumption.
  • the controller 310 may be configured to decrease a period of performing the defrost operation mode PDF as the number of opening times the cooling compartment door increases. Accordingly, it is possible to improve the defrosting efficiency and power consumption.
  • FIG. 12A is a diagram showing a temperature waveform of the evaporator when there is a large amount of frost formation.
  • CVma represents a temperature change waveform in response to the defrost heater being operated only in the continuous operation mode
  • CVmb represents a temperature change waveform in response to the defrost heater being operated by mixing the continuous operation mode and the pulse operation mode.
  • the defrost heater 330 may be continuously turned on, and may be turned off at a time point Tmg, as shown in (b) of FIG. 12A .
  • the defrost heater 330 is continuously turned on during a Tma period and turned off during Tma and Tmb, during Tmc and Tmd, during Tme and Tmf, and during Tmg and Tmh, and the defrost heater 330 is turned on during Tmb and Tmc, during Tmd and Tme, during Tmf and Tmg, and during Tmh and Tmi.
  • the defrost heater 330 operates in the pulse operation mode.
  • the controller 310 controls the defrost heater 330 to be continuously turned on based on the continuous operation mode Pona, and in the ON state of the defrost heater 330, when the change rate ⁇ T of the ambient temperature of the evaporator 122 detected by the temperature sensor 320 is equal to or greater than the first reference value ref1, the controller 310 may enter the pulse operation mode Ponb and control the defroster heater 330 to be turned off. Accordingly, it is possible to improve the defrosting efficiency and power consumption.
  • the controller 310 may be configured to control the defrost heater 330 to be turned on. Accordingly, it is possible to improve the defrosting efficiency and power consumption.
  • the controller 310 may be configured to control the defrost heater 330 may to be turned on. Accordingly, it is possible to improve the defrosting efficiency and power consumption.
  • the controller 310 may be configured to control the defrost heater 330 to be continuously turned on based on the continuous operation mode Pona, and based on the pulse operation mode Ponb, the controller 310 may repeatedly turned on and off the defrost heater 320 the change rate ⁇ T of the temperature around the evaporator 122 may be between the first reference value ref1 and the second reference value ref2. Accordingly, it is possible to improve the defrosting efficiency and power consumption.
  • FIG. 12B is a diagram showing a temperature waveform of the evaporator when the amount of frost formation is less than that of FIG. 12A .
  • CVna represents a temperature change waveform in response to the defrost heater being operated only in the continuous operation mode
  • CVnb represents a temperature change waveform in response to the defrost heater being operated by mixing the continuous operation mode and the pulse operation mode.
  • the defrost heater 330 may be continuously turned on and may be turned off at a time point Tng, as shown in (b) of FIG. 12B .
  • the defrost heater 330 is continuously turned on during a period of Tna, and the defrost heater 330 is turned off during Tna and Tnb, during Tnc and Tnd, during Tne and Tnf, and during Tng and Tnh, and turned on during Tnb and Tnc, during Tnd and Tne, during Tnf and Tng, and during Tnh and Tni.
  • the defrost heater 330 operates in the pulse operation mode.
  • FIG. 13 is a view showing a region requiring cooling power supply and a region requiring defrosting according to temperatures of the refrigerating compartment and the freezer compartment.
  • the horizontal axis may indicate a temperature of the refrigerating compartment
  • the vertical axis may indicate a temperature of the freezer compartment.
  • a temperature is equal to or lower than a reference temperature of the freezer compartment refma, it may indicate that a freezing capacity is sufficient, and when the temperature is equal to or lower than a reference temperature of the refrigerating compartment refmb, it may indicate that cooling capacity of the refrigerating compartment is sufficient.
  • An Arma region in the drawing is a region in which freezing capacity of the freezer compartment and cooling capacity of the refrigerating compartment are sufficient, and may be a region requiring defrosting.
  • the controller 310 may be configured to perform the continuous operation mode and the pulse operation mode described above.
  • ON/OFF of the defrost heater 330 in the pulse operation mode may be controlled based on a temperature change rate around the evaporator 122.
  • the Armb region in the drawing may be a region in which both cooling power of the freezer compartment and cooling power of the refrigerating compartment are insufficient, and may be a cooling power supply requiring region requiring cooling power supply.
  • the controller 310 may be configured to control supply of cooling power.
  • a compressor may be operated or a thermoelectric element may be operated to control supply of cooling power.
  • FIG. 14 is a flowchart illustrating a defrosting method according to an embodiment of the present disclosure
  • FIGS. 15A to 15D are diagrams referenced in the description of FIG. 14 .
  • the controller 310 of the refrigerator 100 determines whether a defrosting operation start time point arrives for defrosting (S610).
  • the controller 310 of the refrigerator 100 may determine whether a defrosting operation start time point arrives, while performing the normal cooling operation mode Pga.
  • the defrosting operation start time point may vary according to a defrost cycle.
  • the controller 310 of the refrigerator 100 may be configured to terminate the normal cooling operation mode and control to perform the defrost operation mode pdf.
  • the defrost operation mode PDF may include a pre-defrost cooling mode Pbd, a heater operation mode PddT, and a post-defrost cooling mode pbf.
  • the heater operation mode PddT may include a continuous operation mode in which the defrost heater 330 is continuously turned on and a pulse operation mode in which the defrost heater 330 is repeatedly turned on and off.
  • the controller 310 of the refrigerator 100 may be configured to control the defrost heater 330 to be continuously turned on based on the continuous operation mode Pona of the heater operation mode PddT in the defrost operation mode PDF (S615).
  • (a) of FIG. 15A illustrates an example of a temperature waveform Tcva around the evaporator 122
  • (b) of FIG. 15A illustrates an example of an operating waveform Pshna of the defrost heater 330.
  • the continuous operation mode Pona1 is performed during a period between Ta1 and Tb1.
  • the controller 310 of the refrigerator 100 may determine whether the temperature change rate ⁇ T detected by the temperature sensor 320 sequentially increases, decreases, and increases again while performing the continuous operation mode Pona1 (S617), and if so, may be configured to terminate the continuous operation mode Pona1 and turn off the defrost heater 330 (S618).
  • the controller 310 of the refrigerator 100 controls the pulse operation mode Ponb1, in which the defrost heater 330 is repeatedly turned on and off according to the end of the continuous operation mode Pona1, to be performed (S620).
  • FIG. 15A illustrates that, while performing the continuous operation mode Pona1, the temperature change rate increases during period Pr1 that is a period up to time point Tr1, the temperature change rate decreases during period Pr2 that is a period from the time point Tr1 to time point Tr2, and the temperature change rate ⁇ T increases again from the time point Tr2.
  • the controller 310 of the refrigerator 100 may determine that the frost of the evaporator 122 is properly removed, and may be configured to control the pulse operation mode Ponb1 to be performed in order to remove the remaining frost and reduce the power consumption.
  • the controller 310 may be configured to control the defrost heater 330 to be turned off in Tb1 after the predetermined time of the time point Tr2 at which the temperature change rate ⁇ T increases again.
  • the controller 310 controls the pulse operation mode Ponb1, in which the defrost heater 330 is repeatedly turned on and off, to be performed after the defrost heater 330 is turned off. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption. In particular, since the defrosting is performed according to the amount of frost of the actual evaporator, it is possible to improve defrosting efficiency and power consumption.
  • the controller 310 may determine whether the temperature change rate ⁇ T detected by the temperature sensor 320 is between a first reference value ref1 and a second reference value ref2 while performing the pulse operation mode Ponb1 (S627), and if so, control the pulse operation mode Ponb1 to be continuously performed (S628). Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller 310 may perform the pulse operation mode Ponb1 when the temperature change rate ⁇ T detected by the temperature sensor 320 is between the first reference value ref1 and the second reference value ref2 while performing the pulse operation mode Ponb1, and as illustrated in FIG. 15A , may be configured to control the ON period of the defrost heater 330 to be sequentially decreased.
  • FIG. 15A illustrates that the ON period of the defrost heater 330 sequentially decreases between Tb1 and Tc1 when the pulse operation modePonb1 is performed. Accordingly, it is possible to improve the power consumption while performing the defrosting.
  • the controller 310 may determine whether the temperature change rate ⁇ T detected by the temperature sensor 320 exceeds the first reference value ref1 while performing the pulse operation mode Ponb1 (S629), and if so, terminate the pulse operation mode Ponb1, and turn off the defrost heater 330 (S640).
  • FIG. 15A illustrates that the temperature change rate ⁇ T detected by the temperature sensor 320 exceeds the first reference value ref1 at the time point Tc1. Accordingly, the controller 310 may be configured to terminate the pulse operation mode Ponb1 and turn off the defrost heater 330. Accordingly, it is possible to terminate the defrost operation mode.
  • step S632 when the temperature change rate ⁇ T detected by the temperature sensor 320 does not exceed the first reference value ref1, step S632 may be performed.
  • the controller 310 may determine whether the temperature change rate ⁇ T detected by the temperature sensor 320 is less than the second reference value ref2 while performing the pulse operation mode Ponb2 (S632), and if so, may be configured to control a continuous operation mode Pona3 to be performed again (S634).
  • FIG. 15A illustrates another example of a temperature waveform Tcvb around the evaporator 122
  • FIG. 15B illustrates another example of an operating waveform Pshb1 of the defrost heater 330.
  • the continuous operation mode Pona2 is performed during the period Pona2 between Ta2 and Tb2.
  • FIG. 15B illustrates that, while performing the continuous operation mode Pona2, the temperature change rate increases during period Ps1 that is a period up to the time point Tr1, the temperature change rate decreases during period Ps2 that is a period from the time point Ts1 to the time point Ts2, and the temperature change rate ⁇ T increases again from the time point Ts2.
  • the controller 310 of the refrigerator 100 may determine that the frost of the evaporator 122 is properly removed, and may be configured to control the pulse operation mode Ponb2 to be performed in order to remove the remaining frost and reduce the power consumption.
  • the controller 310 may be configured to control the defrost heater 330 to be turned off in Tb2 after the predetermined time of the time point Ts2 at which the temperature change rate ⁇ T increases again.
  • the controller 310 controls the pulse operation mode Ponb2, in which the defrost heater 330 is repeatedly turned on and off, to be performed after the defrost heater 330 is turned off. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption. In particular, since the defrosting is performed according to the amount of frost of the actual evaporator, it is possible to improve defrosting efficiency and power consumption.
  • FIG. 15B illustrates that the temperature change rate ⁇ T detected by the temperature sensor 320 is less than the second reference value ref2 at the time point Tc2 while performing the pulse operation mode Ponb2.
  • the controller 310 may end a pulse operation mode Ponb12, and control the continuous operation mode Pona3 to be performed again.
  • FIG. 15B illustrates that the continuous operation mode Pona3 is performed again between Tc2 and Tc3.
  • the controller 310 may be configured to control, when the continuous operation mode Pona1 is performed again, the duration Tc2 to Tc3 of the continuous operation mode Pona3 to be less than the duration Ta2 to Tb2 of the continuous operation mode Pona2 before the pulse operation mode Ponb1 as illustrated in FIG. 15B . Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • FIG. 15B illustrates that the temperature change rate ⁇ T detected by the temperature sensor 320 exceeds the first reference value ref1 at the time point Tc3 while performing the continuous operation mode Pona3.
  • the controller 310 may be configured to terminate the continuous operation mode Pona3 and turn off the defrost heater 330. Accordingly, it is possible to terminate the defrost operation mode.
  • the controller 310 may be configured to control the defrost operation mode including the pre-defrost cooling mode Pbd, the heater operation mode PddT, and the post-defrost cooling mode pbf to be performed, and control the continuous operation mode Pona1 of the defrost heater and the pulse operation mode Ponb1, in which the defrost heater is repeatedly turned on and off, to be performed, based on the heater operation mode PddT. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • controller 310 may be configured to, as the number of opening times of the cooling compartment door increases, decrease the duration of the defrost operation mode. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • FIG. 16 is a flowchart illustrating a defrosting method according to another embodiment of the present disclosure
  • FIGS. 17A to 17D are diagrams referenced in the description of FIG. 16 .
  • the controller 310 of the refrigerator 100 determines whether it is a defrosting operation start time point for defrosting (S1610).
  • the controller 310 of the refrigerator 100 may determine whether it is a defrosting operation start time point while performing a normal cooling operation mode Pga.
  • the defrosting operation start time point may be changed according to the defrosting period.
  • the controller 310 of the refrigerator 100 may be configured to terminate the normal cooling operation mode, and control the defrost operation mode pdf to be performed.
  • the defrost operation mode PDF may include the pre-defrost cooling mode Pbd, the heater operation mode PddT, and the post-defrost cooling mode pbf.
  • the heater operation mode PddT may include the continuous operation mode in which the defrost heater 330 is continuously turned on and the pulse operation mode in which the defrost heater 330 is repeatedly turned on and off.
  • the controller 310 of the refrigerator 100 may be configured to control the defrost heater 330 to be continuously turned on based on the continuous operation mode Pona of the heater operation mode PddT in the defrost operation mode PDF (S1615).
  • the controller 310 of the refrigerator 100 may determine whether the temperature change rate ⁇ T detected by the temperature sensor 320 sequentially increases, decreases, and increases again while performing the continuous operation mode Pona1 (S1617), and if so, may be configured to terminate the continuous operation mode and turn off the defrost heater 330 (S1618).
  • the controller 310 of the refrigerator 100 determines whether the temperature detected by the temperature sensor 320 reaches the defrosting end temperature Tend before performing the pulse operation mode Ponb in which the defrost heater 330 is repeatedly turned on and off after the defrost heater 330 is turned off according to the end of the continuous operation mode (S1619).
  • the controller 310 of the refrigerator 100 controls the defrost heater 330 to be turned on and off at least once after the defrosting end temperature Tend arrives (S1621).
  • the controller 310 of the refrigerator 100 may be configured to terminate the heater operation mode PddT (S1622), and may be configured to control the post-defrost cooling mode pbf to be performed.
  • the controller 310 may be configured to turn off the defrost heater 330 when the temperature detected by the temperature sensor 320 reaches the defrosting end temperature Tend during the continuous operation mode Pona. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller 310 controls the pulse operation mode Ponb, in which the defrost heater 330 is repeatedly turned on and off, to be performed after the continuous operation mode Pona ends, and when the temperature detected by the temperature sensor 320 reaches the defrosting end temperature Tend while performing the pulse operation mode Ponb, may be configured to turn off the defrost heater 330. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • FIG. 17A illustrates an example of a temperature waveform Tck1 around the evaporator 122
  • (b) of FIG. 17A illustrates an example of an operating waveform Pshka of the defrost heater 330.
  • the temperature change rate increases during period Pu1 that is a period up to time point Tu1
  • the temperature change rate decreases during period Pu2 that is a period from the time point Tu1 to time point Tu2
  • the temperature change rate ⁇ T increases again from the time point Tu2.
  • the controller 310 of the refrigerator 100 may determine that the frost of the evaporator 122 is properly removed, and may be configured to control the continuous operation mode Pona to end after a predetermined time elapses from the time point Tu2.
  • the controller 310 of the refrigerator 100 may determine that the defrosting has been sufficiently performed in the continuous operation mode Pona, and control the defrost operation mode to end together with the end of the continuous operation mode Pona.
  • the controller 310 of the refrigerator 100 may determine that the defrosting has been sufficiently performed in the continuous operation mode Pona, and control only the continuous operation mode Pona to be performed and the pulse operation mode Ponb not to be performed.
  • (a) of FIG. 17B illustrates an example of a temperature waveform Tck2 around the evaporator 122
  • (b) of FIG. 17B illustrates an example of an operating waveform Pshkb of the defrost heater 330.
  • the temperature change rate increases during period Pv1 that is a period up to time point Tv1
  • the temperature change rate decreases during period Pv2 that is a period from the time point Tv1 to time point Tv2
  • the temperature change rate ⁇ T increases again from the time point Tv2.
  • the controller 310 of the refrigerator 100 may determine that the frost of the evaporator 122 is properly removed, and may be configured to control the continuous operation mode Pona to end after a predetermined time elapses from the time point Tv2.
  • the controller 310 of the refrigerator 100 controls the defrost heater 330 to be turned on and off at least once after Tkm, which is the time point at which the continuous operation mode Pona ends.
  • the defrost heater 330 is turned on at least once at the time point Tk2. Alternatively, it is also possible to perform turn on and off the defrost heater 330 a plurality of times.
  • the defrost heater 330 By turning on and off the defrost heater 330 at least once after Tkm, which is the time point at which the continuous operation mode Pona ends, the remaining frost can be removed, and as a result, it is possible to improve the reliability of defrost.
  • the controller 310 of the refrigerator 100 may be configured to increase the number of opening times of turn on and off of the defrost heater 330. That is, as the difference increases, it is possible to control the ON period when the defrost heater 330 is turned on and off to increase. Accordingly, the efficient and stable defrosting is possible.
  • step S1619 when the defrosting end temperature is not reached after the defrost heater 330 is turned off, the pulse operation mode Ponb1 in which the defrost heater 330 is repeatedly turned on and off according to the end of the continuous operation mode Pona1 is controlled to be performed (S1620).
  • FIG. 17C illustrates that, while performing the continuous operation mode Pona1, the temperature change rate increases during the period Pr1 that is a period up to the time point Tr1, the temperature change rate decreases during period Pr2 that is a period from the time point Tr1 to the time point Tr2, and the temperature change rate ⁇ T increases again from the time point Tr2.
  • the controller 310 of the refrigerator 100 may determine that the frost of the evaporator 122 is properly removed, and may be configured to control the pulse operation mode Ponb1 to be performed in order to remove the remaining frost and reduce the power consumption.
  • the controller 310 may be configured to control the defrost heater 330 to be turned off in Tb1 after the predetermined time of the time point Tr2 at which the temperature change rate ⁇ T increases again.
  • the controller 310 controls the pulse operation mode Ponb1, in which the defrost heater 330 is repeatedly turned on and off, to be performed after the defrost heater 330 is turned off. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption. In particular, since the defrosting is performed according to the amount of frost of the actual evaporator, it is possible to improve defrosting efficiency and power consumption.
  • the controller 310 may determine whether the temperature change rate ⁇ T detected by the temperature sensor 320 is between a first reference value ref1 and a second reference value ref2 while performing the pulse operation mode Ponb1 (S1627), and if so, control the pulse operation mode Ponb1 to be continuously performed (S1628). Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the controller 310 may perform the pulse operation mode Ponb1 when the temperature change rate ⁇ T detected by the temperature sensor 320 is between the first reference value ref1 and the second reference value ref2 while performing the pulse operation mode Ponb1, and as illustrated in FIG. 17C, may be configured to control the ON period of the defrost heater 330 to be sequentially decreased.
  • FIG. 17C illustrates that the ON period of the defrost heater 330 sequentially decreases between Tb1 and Tc1 when the pulse operation modePonb1 is performed. Accordingly, it is possible to improve the power consumption while performing the defrosting.
  • the controller 310 may determine whether the temperature change rate ⁇ T detected by the temperature sensor 320 exceeds the first reference value ref1 while performing the pulse operation mode Ponb1 (S1629), and if so, terminate the pulse operation mode Ponb1, and turn off the defrost heater 330 (S1640).
  • FIG. 15C illustrates that the temperature change rate ⁇ T detected by the temperature sensor 320 exceeds the first reference value ref1 at the time point Tc1. Accordingly, the controller 310 may be configured to terminate the pulse operation mode Ponb1 and turn off the defrost heater 330. Accordingly, it is possible to terminate the defrost operation mode.
  • step S1632 when the temperature change rate ⁇ T detected by the temperature sensor 320 does not exceed the first reference value ref1, step S1632 may be performed.
  • the controller 310 may determine whether the temperature change rate ⁇ T detected by the temperature sensor 320 is less than the second reference value ref2 while performing the pulse operation mode Ponb2 (S1632), and if so, may be configured to control a continuous operation mode Pona3 to be performed again (S1634).
  • (a) of FIG. 15D illustrates another example of a temperature waveform Tcvb around the evaporator 122
  • (b) of FIG. 15D illustrates another example of an operating waveform Pshnb of the defrost heater 330.
  • the continuous operation mode Pona2 is performed during the period Pona2 between Ta2 and Tb2.
  • FIG. 15D illustrates that, while performing the continuous operation mode Pona2, the temperature change rate increases during period Ps1 that is a period up to the time point Tr1, the temperature change rate decreases during period Ps2 that is a period from the time point Ts1 to the time point Ts2, and the temperature change rate ⁇ T increases again from the time point Ts2.
  • the controller 310 of the refrigerator 100 may determine that the frost of the evaporator 122 is properly removed, and may be configured to control the pulse operation mode Ponb2 to be performed in order to remove the remaining frost and reduce the power consumption.
  • the controller 310 may be configured to control the defrost heater 330 to be turned off in Tb2 after the predetermined time of the time point Ts2 at which the temperature change rate ⁇ T increases again.
  • the controller 310 controls the pulse operation mode Ponb2, in which the defrost heater 330 is repeatedly turned on and off, to be performed after the defrost heater 330 is turned off. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption. In particular, since the defrosting is performed according to the amount of frost of the actual evaporator, it is possible to improve defrosting efficiency and power consumption.
  • FIG. 15D illustrates that the temperature change rate ⁇ T detected by the temperature sensor 320 is less than the second reference value ref2 at the time point Tc2 while performing the pulse operation mode Ponb2.
  • the controller 310 may end a pulse operation mode Ponb12, and control the continuous operation mode Pona3 to be performed again.
  • FIG. 15D illustrates that the continuous operation mode Pona3 is performed again between Tc2 and Tc3.
  • the controller 310 may be configured to control, when the continuous operation mode Pona1 is performed again, the duration Tc2 to Tc3 of the continuous operation mode Pona3 to be less than the duration Ta2 to Tb2 of the continuous operation mode Pona2 before the pulse operation mode Ponb1 as illustrated in FIG. 15D. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • FIG. 15D illustrates that the temperature change rate ⁇ T detected by the temperature sensor 320 exceeds the first reference value ref1 at the time point Tc3 while performing the continuous operation mode Pona3.
  • the controller 310 may be configured to terminate the continuous operation mode Pona3 and turn off the defrost heater 330. Accordingly, it is possible to terminate the defrost operation mode.
  • the controller 310 may be configured to control the defrost operation mode including the pre-defrost cooling mode Pbd, the heater operation mode PddT, and the post-defrost cooling mode pbf to be performed, and control the continuous operation mode Pona1 of the defrost heater and the pulse operation mode Ponb1, in which the defrost heater is repeatedly turned on and off, to be performed, based on the heater operation mode PddT. Accordingly, it is possible to improve the defrosting efficiency and reduce the power consumption.
  • the configuration and the method of the embodiments as described above are not restrictively applied. Rather, all or some of the embodiments may be selectively combined with each other the embodiments may be variously modified.
  • the present disclosure can be applied to a refrigerator, and more particularly, can be applied to a refrigerator capable of improving defrosting efficiency and power consumption.

Landscapes

  • 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)
EP21800170.9A 2020-05-07 2021-04-21 Réfrigérateur Pending EP4148356A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020200054355A KR20210136307A (ko) 2020-05-07 2020-05-07 냉장고
KR1020200054356A KR20210136308A (ko) 2020-05-07 2020-05-07 냉장고
PCT/KR2021/005057 WO2021225309A1 (fr) 2020-05-07 2021-04-21 Réfrigérateur

Publications (2)

Publication Number Publication Date
EP4148356A1 true EP4148356A1 (fr) 2023-03-15
EP4148356A4 EP4148356A4 (fr) 2024-05-22

Family

ID=78468066

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21800170.9A Pending EP4148356A4 (fr) 2020-05-07 2021-04-21 Réfrigérateur

Country Status (3)

Country Link
US (1) US20230194144A1 (fr)
EP (1) EP4148356A4 (fr)
WO (1) WO2021225309A1 (fr)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2894380B2 (ja) * 1991-09-13 1999-05-24 富士電機株式会社 冷気循環式ショーケースの除霜装置
JPH05215460A (ja) * 1992-01-30 1993-08-24 Sanyo Electric Co Ltd 蒸発器の除霜方法及び装置
KR100190126B1 (ko) * 1996-05-21 1999-06-01 윤종용 냉장고의 증발기 제상주기 결정방법 및 제상주기결정장치
KR19980058338U (ko) * 1997-02-21 1998-10-26 배순훈 냉난방기의 실외열교환기 제상장치
KR20010026176A (ko) 1999-09-03 2001-04-06 구자홍 냉장고의 제상히터 제어 방법
US6694754B1 (en) 2002-03-22 2004-02-24 Whirlpool Corporation Refrigeration appliance with pulsed defrost heater
US9127875B2 (en) * 2011-02-07 2015-09-08 Electrolux Home Products, Inc. Variable power defrost heater
JP2012167896A (ja) * 2011-02-16 2012-09-06 Toshiba Corp 冷蔵庫
KR101982776B1 (ko) * 2012-12-10 2019-05-27 엘지전자 주식회사 냉장고 및 그 동작방법
KR102241307B1 (ko) 2014-11-05 2021-04-16 삼성전자주식회사 제상 장치, 이를 구비한 냉장고 및 제상 장치의 제어 방법
US10323875B2 (en) * 2015-07-27 2019-06-18 Illinois Tool Works Inc. System and method of controlling refrigerator and freezer units to reduce consumed energy

Also Published As

Publication number Publication date
EP4148356A4 (fr) 2024-05-22
US20230194144A1 (en) 2023-06-22
WO2021225309A1 (fr) 2021-11-11

Similar Documents

Publication Publication Date Title
US11885538B2 (en) Refrigerator
KR20160090066A (ko) 냉장고 및 그 제어방법
CN103868310A (zh) 冰箱及其操作方法
US9863688B2 (en) Refrigerator and operating method thereof
EP4148356A1 (fr) Réfrigérateur
KR20210136305A (ko) 냉장고
EP4148355A1 (fr) Réfrigérateur
EP4148354A1 (fr) Réfrigérateur
EP4148357A1 (fr) Réfrigérateur
EP4202336A1 (fr) Réfrigérateur
KR20210136308A (ko) 냉장고
KR20210136307A (ko) 냉장고
KR20210136304A (ko) 냉장고
KR20210136309A (ko) 냉장고
KR20210136302A (ko) 냉장고
KR20210136303A (ko) 냉장고
KR20210136306A (ko) 냉장고
JP6496570B2 (ja) 冷却貯蔵庫
KR102442306B1 (ko) 압축기 구동장치 및 이를 구비하는 홈 어플라이언스
EP4202335A1 (fr) Réfrigérateur
EP4202334A1 (fr) Réfrigérateur
EP4202337A1 (fr) Réfrigérateur
EP3951293A1 (fr) Réfrigérateur
KR101542770B1 (ko) 냉장고
KR20100059524A (ko) 냉장고 및 냉장고의 제어방법

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20221207

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20240423

RIC1 Information provided on ipc code assigned before grant

Ipc: F25D 21/08 20060101ALI20240417BHEP

Ipc: F25D 21/00 20060101AFI20240417BHEP