WO2020175829A1 - 냉장고의 제어 방법 - Google Patents

냉장고의 제어 방법 Download PDF

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Publication number
WO2020175829A1
WO2020175829A1 PCT/KR2020/002075 KR2020002075W WO2020175829A1 WO 2020175829 A1 WO2020175829 A1 WO 2020175829A1 KR 2020002075 W KR2020002075 W KR 2020002075W WO 2020175829 A1 WO2020175829 A1 WO 2020175829A1
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WO
WIPO (PCT)
Prior art keywords
temperature
greenhouse
voltage
core
refrigerator
Prior art date
Application number
PCT/KR2020/002075
Other languages
English (en)
French (fr)
Inventor
윤석준
임형근
이정훈
이호연
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to EP20763316.5A priority Critical patent/EP3933329A4/en
Priority to US17/433,403 priority patent/US20220214083A1/en
Priority to CN202080016395.8A priority patent/CN113508274B/zh
Priority to AU2020228953A priority patent/AU2020228953B2/en
Publication of WO2020175829A1 publication Critical patent/WO2020175829A1/ko

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B21/00—Machines, plants or systems, using electric or magnetic effects
    • F25B21/02—Machines, plants or systems, using electric or magnetic effects using Peltier effect; using Nernst-Ettinghausen effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • 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
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • 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
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • F25D11/025—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures using primary and secondary refrigeration systems
    • 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
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/04—Self-contained movable devices, e.g. domestic refrigerators specially adapted for storing deep-frozen articles
    • 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
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/062—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators
    • 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
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/062—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators
    • F25D17/065—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators with compartments at different temperatures
    • 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
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2321/00—Details of machines, plants or systems, using electric or magnetic effects
    • F25B2321/02—Details of machines, plants or systems, using electric or magnetic effects using Peltier effects; using Nernst-Ettinghausen effects
    • F25B2321/021—Control thereof
    • F25B2321/0211—Control thereof of fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2321/00—Details of machines, plants or systems, using electric or magnetic effects
    • F25B2321/02—Details of machines, plants or systems, using electric or magnetic effects using Peltier effects; using Nernst-Ettinghausen effects
    • F25B2321/021—Control thereof
    • F25B2321/0212—Control thereof of electric power, current or voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2321/00—Details of machines, plants or systems, using electric or magnetic effects
    • F25B2321/02—Details of machines, plants or systems, using electric or magnetic effects using Peltier effects; using Nernst-Ettinghausen effects
    • F25B2321/025—Removal of heat
    • F25B2321/0251—Removal of heat by a gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • F25B2347/02—Details of defrosting cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2511—Evaporator distribution valves
    • 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
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/061—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation through special compartments
    • 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
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/30—Quick freezing
    • 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
    • F25D2600/00—Control issues
    • F25D2600/02—Timing
    • 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
    • F25D2600/00—Control issues
    • F25D2600/06—Controlling according to a predetermined profile
    • 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
    • F25D2700/121—Sensors measuring the inside temperature of particular compartments
    • 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
    • F25D2700/122—Sensors measuring the inside temperature of freezer compartments

Definitions

  • This invention relates to the control method of the refrigerator.
  • a refrigerator is a household appliance that stores food at low temperatures, a refrigerator for storing food in a refrigerated state in the range of 3°0 Celsius, and a freezer for storing food in a frozen state in the range of -20°C. Includes.
  • the cryogenic temperature can be understood as referring to a temperature in the range of -45°0 to -50°0.
  • thermoelectric element TEM: 13 ⁇ 4 1110£1 furnace module
  • Korean Patent Laid-Open Patent No. 10-2018-0105572 (September 28, 2018) discloses a refrigerator in the form of a cooperative that stores the storage room at a temperature lower than the indoor temperature using a thermoelectric module. .
  • thermoelectric module disclosed in the preceding technology 1
  • thermoelectric module is configured to cool by exchanging heat with indoor air.
  • thermoelectric modules As the supply current increases, the temperature difference between the heat absorbing surface and the heating surface tends to increase to a certain level.
  • the semiconductor resistance becomes As a result, the amount of heat generated by itself increases. Then, there is a problem that the heat absorbed from the heat absorbing surface cannot be quickly transferred to the heating surface.
  • thermoelectric element if the heating surface of the thermoelectric element is not sufficiently cooled, a phenomenon in which the heat transferred to the heating surface flows backward toward the heat absorption surface occurs, and the temperature of the heat absorption surface increases as well.
  • thermoelectric module In the case of the thermoelectric module disclosed in the preceding technology 1, since the heating surface is cooled by indoor air, there is a limit that the temperature of the heating surface cannot be lower than the indoor temperature.
  • thermoelectric module In order to do so, it is necessary to increase the supply current, which causes a problem of lowering the efficiency of the thermoelectric module.
  • thermoelectric module when the supply current is increased, the temperature difference between the heat absorbing surface and the heating surface increases, resulting in a decrease in the cooling power of the thermoelectric module.
  • thermoelectric module since the storage chamber cooled by the thermoelectric module exists independently, the power supply to the thermoelectric module is cut off when the temperature of the storage chamber reaches a satisfactory temperature. do.
  • the storage compartment has a different temperature range such as a refrigerator compartment or a freezer compartment.
  • thermoelectric module In order to control the core greenhouse temperature in a structure accommodated in the refrigerating chamber, the output of the thermoelectric module and the output of the core greenhouse cooling fan cannot be controlled.
  • thermoelectric module Many experiments and studies have been conducted to overcome the limitations of these thermoelectric modules and to lower the temperature of the storage chamber to a temperature lower than that of the freezer by using the thermoelectric module. As a result, there has been an attempt to attach an evaporator through which the refrigerant flows to the heating surface in order to cool the heating surface of the thermoelectric module to a low temperature.
  • Prior art 2 does not describe the operation control method between the evaporator for cooling the heating surface of the thermoelectric module and the evaporator for the freezing chamber at all.
  • the so-called core greenhouse cooled by the thermoelectric module is accommodated in the freezing chamber. Therefore, when a load is applied to one or both of the freezing chamber and the deep greenhouse, there is no disclosure of a method for controlling the refrigerant circulation system for which storage chamber is given priority to perform load response operation.
  • Prior art 2 does not describe at all how to perform a load response operation when a load is put into the refrigerating chamber other than the freezing room. This means that the evaporator is used as a means for cooling the heating surface of a thermoelectric element. Research has been conducted only on the structure that is applied to a refrigerator, and when applied to a refrigerator,
  • the food stored in the freezer may become abnormal if the food stored in the freezer is not moved to another place.
  • the present invention is proposed to improve the anticipated problems presented above.
  • the purpose of providing a method of controlling the output of a thermoelectric power plant is to prevent an increase in the temperature of the core greenhouse by penetrating the heat load of the freezing chamber into the core greenhouse, in a structure that is housed in a freezing chamber with a lower temperature than the core greenhouse.
  • the purpose of providing a method of controlling the output of the thermoelectric element that can prevent the temperature of the core greenhouse from increasing due to the heat load of the freezing evaporation chamber penetrating into the core greenhouse. do.
  • the method of controlling the output of the thermoelectric element can prevent the heat load from penetrating into the core greenhouse and keep the core greenhouse at a set temperature. It aims to provide. 2020/175829 1»(:1 ⁇ 1 ⁇ 2020/002075
  • a method for controlling a refrigerator according to an embodiment of the present invention for achieving the above object is, when the heart greenhouse mode is on, the thermoelectric module is supplied with low voltage, medium voltage, high voltage and reverse voltage according to the operation mode of the refrigerator. When one of the voltages is controlled to be applied and it is determined that the temperature of the heart greenhouse is in a satisfactory temperature range, the control unit causes a low voltage to be applied to the thermoelectric module, so that the heat load penetrates into the interior of the heart greenhouse from the freezing chamber or the evaporation chamber. Try to avoid doing it.
  • thermoelectric module In addition, during the refrigeration actual phase operation, reverse voltage is applied to the thermoelectric module so that the core thermal phase phase is performed together.
  • thermoelectric module when the core greenhouse is in a state of dissatisfaction and the refrigerator chamber is operating alone, a low voltage is applied to the thermoelectric module to prevent the heat sink from overheating and the heat from flowing back to the cold sink.
  • the core greenhouse fan is operated at one of the low and medium speeds according to the temperature of the freezer and the indoor temperature. Try to reach a satisfactory temperature.
  • thermoelectric module Even when maintained, by supplying a low voltage to the thermoelectric module, there is an effect of preventing the heat load from being transferred from the freezing evaporation chamber to the core greenhouse through the thermoelectric module.
  • thermoelectric module Second, in the refrigerating chamber and freezing chamber trial operation situation, the medium voltage to the thermoelectric module is
  • the freezing chamber and the core greenhouse are cooled at the same time, thereby minimizing the possibility that the load of the other is increased during cooling of one of the freezing chamber and the core greenhouse.
  • thermoelectric module in which the heat sink of the thermoelectric module and the freezer evaporator are connected in series, when the temperature of the freezer is in a satisfactory state, there is an advantage of rapidly cooling the core greenhouse by supplying a high voltage to the thermoelectric module.
  • thermoelectric module by supplying high voltage to the thermoelectric module, the heat load of the core greenhouse is transferred to the maximum heat sink, thereby minimizing the amount of liquid refrigerant flowing into the suction pipe connected to the inlet of the compressor.
  • thermoelectric module in the state where the refrigerant does not flow through the heat sink, the heat load flows back from the heating surface of the thermoelectric module to the heat absorption surface.
  • thermoelectric element when the defrost operation of the freezer evaporator is performed, reverse voltage is applied to the thermoelectric element so that the defrost operation of the thermoelectric element is performed together, so that the vapor generated during the defrosting process of the freezer evaporator penetrates into the inside of the heart greenhouse and Or, it has the advantage of preventing the phenomenon of freezing on the surface of the thermoelectric module.
  • FIG. 1 is a view showing a refrigerant circulation system of a refrigerator to which a control method according to an embodiment of the present invention is applied.
  • FIG. 2 is a perspective view showing the structure of a freezer and a core greenhouse of a refrigerator according to an embodiment of the present invention.
  • FIG. 3 is a longitudinal sectional view taken along 3-3 of FIG. 2;
  • Fig. 5 is a graph showing an efficiency relationship for an input voltage and a Fourier effect.
  • 6 is a graph showing a correlation between cooling power and efficiency according to voltage.
  • FIG. 7 is a diagram showing a reference temperature line for controlling a refrigerator according to a fluctuation in the internal load of the warehouse.
  • thermoelectric elements Graph showing the correlation between voltage and cooling power of thermoelectric elements
  • Figure 9 is to explain the criteria for determining the range of the high voltage and medium voltage
  • thermoelectric element A graph showing the correlation between the proposed voltage versus the cooling power and efficiency of the thermoelectric element.
  • 11 is a flowchart showing a method of controlling the driving of the core greenhouse fan according to the operation mode of the refrigerator when the core greenhouse mode is on.
  • a storage room that can be cooled by a first cooling device and controlled to a predetermined temperature can be defined as the first storage room.
  • a storage chamber that can be cooled by the second cooler and controlled to a lower temperature than the first storage chamber may be defined as the second storage chamber.
  • a storage room that can be cooled by a third cooler and controlled to a lower temperature than the second storage room can be defined as a third storage room.
  • the first cooler for cooling the first storage chamber may include at least one of a first evaporator and a first thermoelectric module including a thermoelectric element.
  • the first evaporator includes a refrigerating chamber evaporator to be described later. can do.
  • At least one of the second thermoelectric modules including 6 thermoelectric elements may be included.
  • the second evaporator may include a freezing chamber evaporator to be described later.
  • thermoelectric modules may include at least one of the third thermoelectric modules including thermoelectric elements.
  • thermoelectric module is used as a cooling means in the present specification
  • thermoelectric module can be applied by replacing the thermoelectric module with an evaporator, for example, as follows.
  • thermoelectric module or "heat absorbing surface of thermoelectric element”
  • Endothermic side can be interpreted as “one side of the evaporator or evaporator”.
  • thermoelectric module means "cold sink of the thermoelectric module"
  • thermoelectric module means "with an evaporator.
  • thermoelectric module controls the constant voltage applied to the thermoelectric module to increase or decrease.
  • controlling to increase or decrease the amount or flow rate of refrigerant flowing through the evaporator means “controlling to increase or decrease the amount or flow rate of refrigerant flowing through the evaporator”, and “opening of the switching valve It can be interpreted in the same meaning as “controlling to increase or decrease” or “controlling to increase or decrease the compressor output”.
  • thermoelectric module controls the reverse voltage applied to the thermoelectric module to increase or decrease.
  • the storage room cooled by the thermoelectric module is referred to as the storage room show.
  • thermoelectric module located adjacent to the thermoelectric module to allow air in the storage compartment to exchange heat with the heat absorbing surface of the thermoelectric module
  • a fan located adjacent to the thermoelectric module to allow air in the storage compartment to exchange heat with the heat absorbing surface of the thermoelectric module may be defined as a “storage compartment showpan”.
  • the storage compartment cooled by the cooler while configuring the refrigerator together with the storage compartment show can be defined as a “storage compartment”.
  • cooling chamber is defined as the space where the cooler is located, and in the cooler
  • a fan for blowing the generated cool air is added, it is defined as including a space in which the fan is accommodated, and in the structure mainly a channel for guiding the cold air blown by the fan to the storage room or a channel for distributing defrost water, the above channel It can be defined as including
  • a defrost heater located at one side of the cold sink can be defined as a cold sink defrost heater in order to remove frost and ice accumulated in the cold sink or its surroundings.
  • a defrost heater located at one side of the heat sink can be defined as a heat sink defrost heater in order to remove frost or ice that has accumulated on the heat sink or its surroundings.
  • a defrost heater located at one side of the cooler can be defined as a cooler defrost heater in order to remove frost or ice that has accumulated in the cooler or its surroundings.
  • a defrost heater located on one side of the wall surface forming the cooler chamber can be defined as a defrost heater in the cooler chamber in order to remove frost and ice accumulated on or around the wall surface forming the cooler chamber.
  • a heater disposed on one side of the cold sink can be defined as a cold sink drain heater in order to minimize re-icing or re-freezing during the process of discharging the melted defrost water or water vapor in or around the cold sink.
  • a heater disposed on one side of the heat sink can be defined as a heat sink drain heater in order to minimize re-icing or re-frosting in the process of discharging the melted defrost water or water vapor in or around the heat sink.
  • a heater disposed on one side of the cooler can be defined as a cooler drain heater in order to minimize re-icing or re-freezing during the process of discharging the melted defrost water or steam from the cooler or its surroundings.
  • a heater disposed on one side of the wall forming the cooler chamber is placed in the cooler chamber. It can be defined as a drain heater.
  • the "cold sink heater” to be described below can be defined as a heater that performs at least one of the functions of the cold sink defrost heater and the cold sink drain heater.
  • heat sink heater can be defined as a heater that performs at least one of the functions of the heat sink defrost heater and the heat sink drain heater.
  • the “cooler heater” can be defined as a heater that performs at least one of the functions of the cooler defrost heater and the cooler drain heater.
  • the "back heater” to be described below can be defined as a heater that performs at least one of the functions of the heat sink heater and the defrost heater in the cooler chamber. That is, the back heater.
  • the heater can be defined as a heater that performs at least one of the functions of a heat sink defrost heater, a heater sink drain heater, and a cooler chamber defrost heater.
  • the first storage chamber may include a refrigerating chamber that can be controlled by the temperature of the image by the first cooler.
  • the second storage chamber may include a freezing chamber that can be controlled to a subzero temperature by the second cooler.
  • the third storage chamber is cryogenic by the third cooler.
  • the first to third storage rooms are all controlled by the temperature of the image, and the first and second storage rooms are controlled by the temperature of the image, and the third storage room is below zero.
  • the "operation" of the refrigerator is the operation start condition or
  • Step (I) of judging whether or not it is satisfied step (II) in which a predetermined operation is performed when the driving input condition is satisfied, step (III) of determining whether the operation completion condition is satisfied, and operation completion If the condition is satisfied, it can be defined as including the four operation stages of stage (IV) at which the operation ends.
  • control unit supplies cold air from the cooler of the storage room to cool the storage room. It is defined as controlling.
  • the general operation may include a refrigerating chamber cooling operation, a freezer cooling operation, a deep greenhouse cooling operation, and the like.
  • the special operation may mean an operation other than the operation defined as the general operation.
  • the special operation may include a defrost operation controlled to supply heat to the cooler in order to melt frost or ice deposited on the cooler due to the elapsed defrost cycle of the storage compartment.
  • the above special operation corresponds to at least one of the cases where the set time has elapsed from the point when the door of the storage room is opened and closed, or the temperature of the storage room has risen to the set temperature before the set time has elapsed. If this is satisfied, a load response operation may be further included in which cold air is supplied from the cooler to the storage compartment in order to remove the heat load penetrating the storage compartment.
  • the above load response operation is a door load response operation performed to remove the load that has penetrated into the storage room after opening and closing of the storage room door, and the load inside the storage room when power is applied for the first time after installing the refrigerator. It may include an initial cold start operation performed to remove the
  • the defrost operation may include at least one of a refrigeration actual defrost operation, a freezing actual defrost operation, and a deep greenhouse defrost operation.
  • the upper door load response operation may include at least one of a refrigerator compartment door load response operation, a freezing compartment door load response operation, and a core greenhouse load response operation.
  • the core greenhouse load response operation is performed when the load increases according to the opening of the core greenhouse door, the input conditions for the core greenhouse door load response, and when the core greenhouse is switched from off to the on state.
  • Performed to remove the load Interpretation to mean an operation to remove the heart greenhouse load, which is performed when at least one of the conditions for inputting the initial cold start operation of the core greenhouse and the first post-defrost operation input conditions that begin after the completion of the core greenhouse defrost operation is satisfied.
  • the judgment is to judge whether at least one of the conditions in which at least one of the freezer door and the core greenhouse door is opened and closed after a certain period of time elapses, or the condition in which the heart greenhouse temperature rises to the set temperature within a certain period of time is satisfied.
  • This may include determining whether or not it has been converted.
  • the judgment of whether the conditions for inputting the operation after the core temperature room defrost are satisfied is to stop the cold sink heater off, the back heater off, the reverse voltage applied to the thermoelectric module for cold sink defrost, and the reverse voltage for cold sink defrost.
  • This may include stopping the constant voltage applied to the thermoelectric module for defrosting the heat sink after it is applied, raising the temperature of the housing containing the heat sink to the set temperature, and determining at least one during the actual shutdown of the freezing operation.
  • the storage room including at least one of the refrigerating chamber, the freezing chamber and the core greenhouse
  • the operation can be categorized into a storage room general operation and a storage room special operation.
  • the control unit can control one operation (operation is performed with priority and the other operation (pause)).
  • the collision of operation is: i) the input condition of operation A and the input condition of operation B are satisfied at the same time, and ii) operation while operation A is being performed because the input condition of operation A is satisfied.
  • iii) the input condition of operation A is satisfied and a collision occurs while the input condition of operation B is satisfied and operation B is being performed.
  • control unit determines the execution priority of the driving in conflict, and causes the so-called “collision control algorithm” to be executed to control the execution of the corresponding operation.
  • the stopped operation B can be controlled to follow at least one of the three cases in the example below after completion of operation A.
  • “disable” means that the interrupted operation B is no longer performed, and the operation It does not judge whether the input condition of B is satisfied, i.e., it can be seen that the judgment information on the input condition of operation B is initialized.
  • operation B is an operation in which the fan is driven for 10 minutes, and the operation is stopped at the point 3 minutes has elapsed after the start of operation due to a collision with operation A, whether the operation simulation input conditions are satisfied at the time operation A is completed. Judge again whether or not,
  • operation B is an operation that drives the fan for W minutes, and the operation is interrupted at the point 3 minutes has elapsed after the start of operation due to a collision with operation A, the compressor for a remaining time of 7 minutes immediately from the time operation A is completed. Let it drive more.
  • the priority of driving in the present invention can be determined as follows.
  • the cooling operation of the refrigerating chamber (or freezing chamber) can be prioritized.
  • the cooling power lower than the maximum cooling power of the heart greenhouse cooler can be supplied from the heart greenhouse cooler to the heart greenhouse. have.
  • the above cooling power may mean at least one of the cooling capacity of the cooler itself and the air volume of the cooling fan located adjacent to the cooler.
  • the control unit, the refrigerator compartment If the (or freezer) cooling operation and the core greenhouse cooling operation collide, the refrigeration chamber (or freezer) cooling operation is prioritized, but a voltage lower than the maximum voltage that can be applied to the thermoelectric module is input to the thermoelectric module.
  • the control unit can control the refrigerating chamber door load response operation to be performed with priority.
  • 2020/175829 1 (:1 ⁇ 1 ⁇ 2020/002075
  • the control unit can control the core greenhouse door load response operation to be performed with priority.
  • the control unit controls the refrigeration chamber operation and the core greenhouse door load response operation to be performed at the same time, and when the refrigerator chamber temperature reaches a specific temperature < When the refrigerating chamber temperature rises again and reaches a specific temperature (15 consciousness ⁇ 15) while the core greenhouse door load response operation is independently performed, the control unit operates the refrigerating chamber again and responds to the core greenhouse door load. The operation can be controlled to be performed at the same time. After that, depending on the temperature of the refrigerating chamber, the operation switching process between the simultaneous trial operation of the core greenhouse and the refrigeration chamber and the single operation of the core greenhouse can be controlled to be repeatedly performed.
  • control unit can control the operation to be carried out in the same manner as when the refrigerating chamber operation and the core greenhouse door load response operation collide when the operation input condition of the core greenhouse load response operation is satisfied.
  • the description is limited to the case where the first storage chamber is a refrigerating chamber, the second storage chamber is a freezing chamber, and the third storage chamber is a heart greenhouse.
  • FIG. 1 is a diagram showing a refrigerant circulation system in a refrigerator according to an embodiment of the present invention.
  • a refrigerant circulation system 10 includes a compressor 11 for compressing a refrigerant into a high temperature and high pressure gas refrigerant, and a refrigerant discharged from the compressor 11
  • a condenser 12 that condenses into a high temperature and high pressure liquid refrigerant
  • an expansion valve that expands the refrigerant discharged from the condenser 12 into a two-phase refrigerant of low temperature and low pressure
  • the refrigerant that has passed through the expansion valve is evaporated into a gas refrigerant of low temperature and low pressure.
  • the refrigerant discharged from the evaporator flows into the compressor 11.
  • the above components are connected to each other by a refrigerant pipe to form a closed circuit.
  • the expansion valve may include a refrigerator compartment expansion valve 14 and a freezer compartment expansion valve 15.
  • the refrigerant pipe is divided into two branches, and the refrigerant pipe divided into two branches.
  • the refrigerating compartment expansion valve 14 and the freezing compartment expansion valve 15 are connected to each other. That is, the refrigerator compartment expansion valve 14 and the freezer compartment expansion valve 15 are connected in parallel at the outlet of the condenser 12.
  • a switching valve 13 is mounted at the point where the refrigerant pipe is divided into two at the outlet side of the condenser 12.
  • the condenser 12 passes through the condenser 12 by the opening degree control operation of the switching valve 13.
  • One refrigerant may flow to only one of the refrigerating compartment expansion valve (14) and the freezer compartment expansion valve (15) or divided into both sides.
  • the switching valve 13 may be a three-way valve, and the flow direction of the refrigerant is determined according to the operation mode.
  • one switching valve such as the three-way valve is mounted at the outlet of the condenser 12 to It is also possible to control the flow direction of the refrigerating chamber expansion valve (14) and the opening and closing valve on the inlet side of the freezing compartment expansion valve (15).
  • Each mounted structure would also be possible.
  • the evaporator As a first example of the evaporator arrangement method, the evaporator, a refrigerating chamber evaporator 16 connected to the outlet side of the refrigerating chamber expansion valve 14, and the freezing chamber
  • It may include a heat sink 24 and a freezer evaporator 17 connected in series connected to the outlet side of the expansion valve 15.
  • the heat sink 24 and the freezer evaporator 17 are connected in series, and the freezer expansion valve is connected in series.
  • the passed refrigerant passes through the heat sink 24 and then flows into the freezing chamber evaporator 17.
  • the heat sink 24 is an evaporator, it is provided for the purpose of cooling the heating surface of the thermoelectric module to be described later, not the purpose of exchanging heat with the core greenhouse cooler.
  • a second refrigerant circulation system consisting of an expansion valve for cooling the refrigerator compartment, a condenser for cooling the refrigerator compartment, and a compressor for cooling the refrigerator compartment.
  • the condenser and the second refrigerant circulation system constituting the first refrigerant circulation system are possible.
  • the condensers constituting the condensers may be provided independently, or a complex condensers may be provided that are condensers consisting of a single unit but the refrigerant is not mixed.
  • the refrigerant circulation system of a refrigerator having two storage rooms including a core greenhouse may be configured only with the first refrigerant circulation system.
  • a condensing fan (121) is mounted in a location adjacent to the condenser (12), a refrigerating compartment fan (161) is mounted in a location adjacent to the refrigerator compartment evaporator (16), and a location adjacent to the freezing compartment evaporator (17) Freezer fan (1 unit) is installed.
  • a refrigerating chamber maintained at a refrigeration temperature by the cold air generated by the refrigerating chamber evaporator 16
  • a freezing chamber maintained at a refrigerating temperature by the cold air generated by the freezing chamber evaporator 16
  • thermoelectric module to be described later.
  • a heart chamber maintained at a cryogenic or ultra-low temperature (dee freezing)
  • the refrigerating chamber and the freezing chamber can be arranged adjacent to each other in the vertical direction or left and right directions, and are partitioned from each other by a partition wall.
  • the heart greenhouse may be provided on one side of the freezing chamber, but the present invention is the above Including that the core greenhouse is provided on the outer side of the freezing chamber.
  • the core greenhouse 202 may be partitioned from the freezing chamber by a core temperature case 201 having high insulation performance.
  • thermoelectric module when power is supplied, one side absorbs heat and the other side is a thermoelectric element (21) showing a characteristic of dissipating heat, and is mounted on the heat absorbing surface of the thermoelectric element (21)
  • a cold sink (22), a heat sink (1 ! ⁇ ) mounted on the heating surface of the thermoelectric element (21), and an insulating material (23) that blocks heat exchange between the cold sink (22) and the heat sink. May include.
  • thermoelectric element 21 the heat sink 24 is in contact with the heating surface of the thermoelectric element 21
  • thermoelectric element 21 exchanges heat with the refrigerant flowing inside the heat sink 24. As it flows along the inside of the heat sink 24, the heat generated by the thermoelectric element 21 The refrigerant absorbing heat from the surface flows into the freezing chamber evaporator 17.
  • a cooling fan may be provided in front of the cold sink 22, and the cooling fan may be defined as a core greenhouse fan 25 since the cooling fan is disposed behind the inside of the core greenhouse.
  • the cold sink 22 is disposed inside the heart greenhouse 202 and behind the
  • the cold sink 22 exchanges heat with the core greenhouse cooler. It absorbs heat through the heat absorbing surface and then functions to transfer it to the heat absorbing surface of the thermoelectric element 21. The heat transferred to the heat absorbing surface is transferred to the heating surface of the thermoelectric element 21.
  • the heat sink 24 has a function of re-absorbing heat that is absorbed from the heat absorption surface of the thermoelectric element 21 and transferred to the heating surface of the thermoelectric element 21 to release it to the outside of the thermoelectric module 20 do.
  • FIG. 2 is a perspective view showing a structure of a freezing chamber and a core greenhouse of a refrigerator according to an embodiment of the present invention
  • FIG. 3 is a longitudinal sectional view taken along 3-3 of FIG. 2.
  • a refrigerator according to an embodiment of the present invention includes an inner case 101 defining a freezing chamber 102, and a core-temperature refrigeration unit mounted on an inner side of the freezing chamber 102 ( 200).
  • the inside of the refrigerating chamber is maintained at about 3°C (: is maintained inside and outside the freezing chamber 102, the inside of the freezing chamber 102 is maintained at about -18° (: is maintained at the inside and outside, while the temperature inside the deep temperature refrigeration unit 200, that is,
  • the internal temperature of the core greenhouse 202 should be maintained at about -50°0. Therefore, to maintain the internal temperature of the core greenhouse 202 at a cryogenic temperature of -50°, the same as the thermoelectric module 20 in addition to the freezer evaporator. Additional refrigeration means are required.
  • the core temperature and refrigeration unit 200 includes a core temperature case 201 forming a core greenhouse 202 inside, and a core greenhouse drawer 203 that is slidingly inserted into the core temperature case 201, And a thermoelectric module 20 mounted on the rear surface of the shim-on case 201.
  • a shim-on case 201 is connected to one side of the front side of the shim-on case 201, and the entire interior of the shim-on case 201 is configured as a food storage space.
  • a refrigeration evaporation chamber 104 is formed in which the evaporator 17 is accommodated.
  • the interior space of the inner case 101 is divided into the refrigeration evaporation chamber 104 and the freezing chamber 102 by the partition wall 103.
  • the thermoelectric module 20 is fixedly mounted on the front surface of the upper plan wall 103, and a part of the thermoelectric module 20 is accommodated in the core greenhouse 202 through the core temperature case 201.
  • the heat sink 24 constituting the thermoelectric module 20 may be an evaporator connected to the freezer expansion valve 15, as described above.
  • a space in which the heat sink 24 is accommodated may be formed in the partition wall 103.
  • thermoelectric element 21 When the rear surface of the thermoelectric element 21 is in contact with the front surface of the heat sink 24 and power is applied to the thermoelectric element 21, the rear surface of the thermoelectric element 21 becomes a heating surface.
  • thermoelectric element [159] The cold sink 22 is in contact with the front surface of the thermoelectric element, and the thermoelectric
  • thermoelectric element 21 When power is applied to the element 21, the front surface of the thermoelectric element 21 becomes a heat absorbing surface.
  • the cold sink 22 is a heat conduction plate made of an aluminum material, and the
  • It may include a plurality of heat exchange fins extending from the front surface of the heat conduction plate, and the plurality of heat exchange fins may be vertically extended and spaced apart in the horizontal direction.
  • the cold sink 22 is interpreted as a heat transfer member including not only the heat conductor but also the housing. This applies equally to the heat sink 22, so that the heat sink 22 should be interpreted as a heat transfer member including a housing when a housing is provided as well as a heat conductor consisting of a heat conduction plate and a heat exchange fin. do.
  • the core greenhouse fan 25 is disposed in front of the cold sink 22,
  • thermoelectric device [163] Hereinafter, the efficiency and cooling power of the thermoelectric device will be described.
  • thermoelectric module 20 can be defined as a coefficient of performance (C0P), and the efficiency equation is as follows.
  • thermoelectric module 20 can be defined as follows.
  • thermoelectric element distance between heat absorbing surface and heating surface
  • thermoelectric element The area of the thermoelectric element
  • Tc temperature of the heat absorbing surface of the thermoelectric element
  • the first term on the right can be defined as the Peltier Effect and the amount of heat transferred between both ends of the heat absorbing surface and the heating surface due to the voltage difference.
  • the Peltier effect is a current function and increases in proportion to the supply current.
  • thermoelectric element acts as a resistance
  • the resistance can be regarded as a constant, it can be said that voltage and current are in a proportional relationship. That is, when the voltage applied to the thermoelectric element 21 increases, the current also increases. Therefore, the Peltier effect can be seen as a current function. It can also be seen as a function of voltage.
  • the cooling power can also be seen as a function of current or voltage.
  • the effect acts as a plus effect that increases the cooling power; that is, when the supply voltage increases, the Peltier effect increases and the cooling power increases.
  • the Joule effect means the effect of generating heat when current is applied to the resistor. In other words, since heat is generated when power is supplied to the thermoelectric element, this acts as a negative effect of reducing the cooling power. Therefore, as the voltage supplied to the thermoelectric element increases, the Joule effect increases, resulting in lowering the cooling power of the thermoelectric element. Bring it.
  • the Fourier effect means an effect of transferring heat by heat conduction when a temperature difference occurs on both sides of a thermoelectric element.
  • the thermoelectric element includes a heat absorbing surface and a heat generating surface formed of a ceramic substrate, and a semiconductor disposed between the heat absorbing surface and the heating surface.
  • a voltage is applied to the thermoelectric element, a temperature difference between the heat absorbing surface and the heating surface is increased. Heat absorbed through the heat absorbing surface passes through the semiconductor and is transferred to the heating surface.
  • heat is reversed from the heating surface to the heat absorbing surface by heat conduction. A phenomenon occurs, which is called the Fourier effect.
  • the Fourier effect acts as a negative effect that lowers the cooling power.
  • the temperature difference between the heating surface and the heat absorbing surface of the thermoelectric element 13 ⁇ 4- ⁇
  • the value is large. The result is that the cold power is reduced.
  • the Fourier effect can be defined as a function of the temperature difference between the heat absorbing surface and the heating surface, i.e.
  • thermoelectric element As the supply voltage (or current) increases, the cooling power increases, which can be explained by the above cooling power equation. Since the value is fixed, it becomes a constant. Since the above value for each standard of the thermoelectric element is determined, it is possible to set an appropriate standard for the thermoelectric element according to the required value.
  • Peltier effect can be seen as a first-order function of voltage (or current) and a Joule effect, that can be seen as a second-order function of voltage (or current).
  • the increase is greater than the increase of the Joule effect, which is the second function of voltage, and consequently, the cooling power increases.
  • the function of the Joule effect is close to a constant, so that the cooling power approaches the linear function of the voltage. It shows the form of doing.
  • the supply voltage is in the range of about 30 to 40 ⁇ , more
  • the cooling power is maximum when it is about 35 ⁇ . Therefore, if only the cooling power is considered, it can be said that it is good to have a voltage difference in the range of 30 to 40 ⁇ in the thermoelectric element.
  • 5 is a graph showing an efficiency relationship between an input voltage and a Fourier effect.
  • the above efficiency((: ⁇ ! 5 ) is a function of not only the cooling power but also the input power, and if the resistance of the thermoelectric element (21) is a constant, it becomes a function of V 2.
  • the efficiency is finally Peltier effect-Fourier It can be expressed as an effect.
  • the graph of the efficiency can be considered to be in the form as shown in FIG.
  • 6 is a graph showing a correlation between cooling power and efficiency according to voltage.
  • thermoelectric element As shown in Fig. 6, as an example, it can be seen that the efficiency of the thermoelectric element is the highest within the range of about 12 ⁇ ⁇ 17 ⁇ in the case of a tear-electric element. Within the above voltage range, the cooling power continues to increase. Therefore, considering the cooling power together, a voltage difference of at least 12 ⁇ or more is required, and when the voltage difference is 14 ⁇ , it can be seen that the efficiency is maximum.
  • 7 is a diagram showing a reference temperature line for controlling a refrigerator according to a change in a high internal load.
  • the set temperature of each storage room is defined as a notch temperature.
  • the reference temperature line may be expressed as a critical temperature line.
  • the lower reference temperature line is a reference temperature line that separates the satisfaction and dissatisfaction temperature regions. Therefore, the region below the lower reference temperature line (which is defined as a satisfaction region or a satisfaction region, and Line-up area (can be defined as an unsatisfied or unsatisfied area)
  • the upper reference temperature line is a reference temperature line that divides the dissatisfied temperature region and the upper limit temperature region. Therefore, the upper reference temperature line region (C) can be defined as an upper limit region or an upper limit section, and special operation It can be seen as an area.
  • the lower reference temperature line when defining a satisfaction/dissatisfaction/upper temperature range for refrigerator control, the lower reference temperature line may be defined as either a case to be included in a satisfaction temperature range or a case to be included in a dissatisfaction temperature range.
  • the upper reference temperature line can be defined as one of a case to be included in the unsatisfactory temperature range and a case to be included in the upper limit temperature range.
  • Figure 7 (a) shows the reference temperature line for the refrigerator control according to the temperature change of the refrigerator compartment
  • the notch temperature (N1) of the refrigerator compartment is set to the temperature of the image.
  • the first temperature difference (dl) is a temperature value increased or decreased from the notch temperature (N1) of the refrigerating chamber, and defines a temperature section in which the refrigerating chamber temperature is considered to be maintained at the notch temperature (N1), which is a set temperature. It can be defined as a control differential or a control diffetial temperature, which can be approximately 1.5 days.
  • d2 may be 4.5 O C.
  • the first dissatisfaction critical temperature may be defined as the upper input temperature. 2020/175829 1»(:1 ⁇ 1 ⁇ 2020/002075
  • the internal temperature of the chamber is the first dissatisfaction threshold
  • the second dissatisfaction temperature 4 is lower than the first dissatisfaction temperature 3) ,
  • the third temperature difference ((13) above can be 3.0 nm (:.
  • the second unsatisfactory critical temperature 4) can be defined as the upper limit release temperature.
  • the compressor's cooling power is adjusted so that the inside temperature reaches the second satisfaction threshold 2), and then the compressor stops running.
  • the shape of the reference temperature line for freezer temperature control is the same as the shape of the reference temperature line for refrigeration room temperature control, but the amount of temperature change increasing or decreasing from the notch temperature word2) and the notch temperature word2) ⁇ 1 ⁇ 2 ⁇ 3 )To the notch temperature of this refrigerator compartment) and temperature
  • the freezing chamber notch temperature word 2) may be -18°0 as described above, but
  • control differential temperature (1) which defines the temperature range that is considered to be maintained at the set temperature, the notch temperature word2), can be 2 days.
  • the special operation algorithm is terminated when the freezer temperature drops to the second dissatisfaction threshold temperature (upper limit release temperature) 24), which is lower than the first dissatisfaction temperature word 23) by a third temperature difference 3). Adjust the compressor cooling power so that the temperature of the freezer is lowered to the second satisfaction critical temperature 22).
  • the reason the temperature line is applied is because the core greenhouse is inside the freezing chamber.
  • the first and second satisfaction critical temperatures and the first and second unsatisfactory critical temperatures are also critical for freezer temperature control.
  • the temperature is set equal to 21 22 23 24).
  • FIG. 7 is a diagram showing a reference temperature line for controlling a refrigerator according to a change in the heart greenhouse temperature when the heart greenhouse mode is turned on.
  • the temperature word 3) is set to a temperature significantly lower than the freezing chamber notch temperature word 2), and can be about -45°0--55° (:, preferably -55° (:.
  • the core greenhouse notch temperature word 2). 3) corresponds to the heat absorbing surface temperature of the thermoelectric element (21), and the freezing chamber notch temperature word 2) corresponds to the heating surface temperature of the thermoelectric element (21).
  • the temperature of the heating surface of the thermoelectric element (21) in contact with the sink (24) is maintained at least at a temperature corresponding to the temperature of the refrigerant that has passed through the freezer expansion valve. Therefore, the temperature difference between the heat absorbing surface and the heating surface of the thermoelectric element, i.e.! Becomes 32 ⁇ (:.
  • control differential temperature (B) that defines the temperature range in which the core greenhouse is considered to be maintained at the set temperature, which is the set temperature, is the control differential temperature (B), and the immediate core greenhouse control differential temperature is higher than the freezer freezer control differential temperature: 1). It can be set, for example, it can be 3 ⁇ (:.
  • the second temperature difference ⁇ 12) can be 5 (:).
  • the second temperature difference of the core greenhouse is higher than 12) the second temperature difference of the freezing chamber.
  • the gap between the first dissatisfaction critical temperature word 33) for the deep greenhouse temperature control and the deep greenhouse notch temperature word 3) is the first dissatisfaction critical temperature word 23) and the freezing chamber notch temperature word for freezer temperature control. 2) It is set larger than the interval.
  • a specific step In addition to the meaning of performing a specific step if any one of the plurality of conditions is satisfied at the time the control unit judges, a specific step must be satisfied only one of the plurality of conditions, only some or all of the conditions. It should be interpreted as including the meaning of performing.
  • thermoelectric module by controlling the voltage applied to the thermoelectric module and the output (or speed) of the core greenhouse fan, taking into account the temperature inside the room where the refrigerator is placed and the temperature inside the refrigerator, freezing chamber and core greenhouse, the core greenhouse temperature is reduced. A control method to keep it stable will be described.
  • control unit of the refrigerator may store a look-up table that is divided into a number of room temperature zones (RT Zones) according to the indoor temperature range. For example, as shown in Table 1 below, Depending on the indoor temperature range
  • the temperature range zone with the highest indoor temperature can be defined as RT Zone 1 (or Z1), and the temperature range zone with the lowest indoor temperature can be defined as RT Zone 8 (or Z8). It can be seen as a midsummer indoor condition, and the Z8 can be seen as a midwinter indoor condition.
  • the indoor temperature zones can be grouped into large, medium, and sub-classified types. For example, as shown in Table 1 above, the indoor temperature can be classified. Zones can be defined as low-temperature zones, medium-temperature zones (or comfort zones), and high-temperature zones depending on the temperature range. For example, if the current room temperature is above 38 O C, the room temperature belongs to RT Zone 1, It can be said to be applicable to the high temperature region.
  • the boundary temperature defining the indoor temperature zone is not limited to Table 1 and may be set in various ways.
  • RT Whereas Zone 2 or less can be defined as a hot zone, in the case of spring, autumn or winter,
  • RT Zones 1 to 3 can be defined as high temperature zones, and RT Zone 4 or higher can be defined as low temperature zones.
  • Table 2 below shows the cooling power map of the thermoelectric element for deep green room control, which shows the voltage supplied to the thermoelectric element according to the operating condition of the refrigerator.
  • the heart greenhouse temperature sensor is periodically turned on to detect the heart greenhouse temperature, and then the on-off cycle and time of the heart greenhouse fan are controlled so that the heart greenhouse temperature is maintained at the freezer satisfaction temperature.
  • thermoelectric module output control when the cardiac greenhouse mode is on Since the present invention relates to the thermoelectric module output control when the cardiac greenhouse mode is on, a description of the control method when the cardiac greenhouse mode is off will be omitted.
  • control Defined as control. If the core greenhouse temperature enters the temperature range satisfactory and the power supply to the thermoelectric module is cut off, the temperature difference between the heat absorbing surface and the heating surface of the thermoelectric element is not formed and functions as a heat transfer medium.
  • the refrigerant flowing through the heat sink 24 of the thermoelectric module 20 is maintained within the range of -28° (:), which is the temperature level of the freezer, while the internal temperature of the core greenhouse 202 is maintained at -58° (:), which is a cryogenic temperature. Then, the heat load of the heat sink 24 penetrates into the inside of the core greenhouse 202 along the thermoelectric module 20. As a result, a phenomenon in which the load inside the core greenhouse is naturally increased due to the heat conduction phenomenon. Therefore, when the heart greenhouse mode is on, it is recommended to apply a low voltage to prevent the heat load from penetrating into the heart greenhouse through the thermoelectric module even if the heart greenhouse temperature is in the satisfactory temperature range.
  • thermoelectric module 20 when the actual freezing operation is performed, a reverse voltage is applied to the thermoelectric module 20 so that the deep heating actual defrost operation is performed together.
  • the actual freezing operation means the defrost operation of the freezing chamber evaporator.
  • the core greenhouse defrost operation means the cold-sink defrost operation and the heat sink operation of the thermoelectric module.
  • the compressor In a refrigerant circulation system in which the heat sink of the thermoelectric module and the refrigeration chamber evaporator are connected in series, the compressor must be driven in order to maintain the operating state of either the core greenhouse or the freezing chamber. In particular, for the core greenhouse cooling operation The compressor must run at maximum cooling power.
  • the meaning of closing the freezer compartment valve means that the freezer compartment valve is closed. It can be explained by adjusting the opening of the selector valve 13 so that the refrigerant does not flow toward the expansion valve 15.
  • closing the refrigerating compartment valve means that the refrigerating compartment expansion valve (14)
  • thermoelectric module If the freezer valve is closed for the freezing room, the heat sink 24 of the thermoelectric module does not perform heat dissipation, so the heat absorption capacity of the thermoelectric element decreases, and the heat backflow occurs from the heating surface to the heat absorption surface, resulting in the core greenhouse load. It can lead to increasing problems.
  • thermoelectric module when reverse voltage is applied to the thermoelectric module for the core temperature room defrost, the heating surface of the thermoelectric module becomes a heat absorbing surface, absorbing heat from the refrigerant flowing along the heat sink (24) and cold 2020/175829 1»(:1 ⁇ 1 ⁇ 2020/002075
  • the frost generated in the cold sink 22 melts and flows out of the core greenhouse, and the defrost water flowing out of the core greenhouse flows into the freezing evaporation chamber.
  • Defrost water flowing into the freezing evaporation chamber may freeze on the wall of the freezing evaporation chamber maintained at a sub-zero temperature (-28 ⁇ 0), or may cause a flaking wound of freezing on one surface of the freezing chamber evaporator 17.
  • thermoelectric module for the core greenhouse defrost, the cold sink 22
  • the heat sink 22 While the temperature of the image rises, the heat sink 22 maintains the refrigerant temperature at -28° (:, so the temperature difference between the heat absorbing surface and the heating surface increases, leading to a decrease in the cooling power of the thermoelectric module, and the cooling power decreases.
  • the efficiency (() also decreases, a problem occurs.
  • the reverse voltage applied to the thermoelectric module during the freezing phase may be the maximum reverse voltage, but is not limited thereto.
  • the maximum reverse voltage is the maximum applied to the thermoelectric module.
  • thermoelectric module In addition, if the current freezer valve and the refrigerator compartment valve are both open and in a simultaneous operation mode, and it is determined that the core greenhouse temperature is above the unsatisfactory region, a medium voltage can be supplied to the thermoelectric module.
  • thermoelectric module 20 In detail, in the simultaneous operation mode, since the refrigerator compartment cooling and the freezer cooling are performed together, if a high voltage is applied to the thermoelectric module 20, a problem occurs that the time it takes for the freezing chamber temperature to enter the satisfactory temperature range becomes longer. do.
  • the notch temperature word is set high.
  • Cooling is advantageous in preventing a rapid increase in the internal temperature and minimizing deterioration of food.
  • thermoelectric module 20 does not function as a heat dissipation means when the refrigerating chamber is operating alone.
  • the thermoelectric module 20 carries the heat load at the core temperature. It is desirable to prevent it from functioning as a heat conductor that actually conducts.
  • thermoelectric element 21 The output control of the case thermoelectric element 21 will be described.
  • thermoelectric module 20 First, the heat sink 24 and the freezing chamber evaporator 17 of the thermoelectric module 20 are serially
  • the compressor operates at its maximum output.
  • thermoelectric element (21) It is important to cool the freezer quickly first. Therefore, when the freezer temperature is in the upper temperature range, a low voltage is applied to the thermoelectric element (21) and the cooling power of the refrigerant flowing into the freezer evaporator (17) is insufficient. It should not be long.
  • thermoelectric element 21 a medium voltage is applied to the thermoelectric element 21 so that the cooling rate of the core greenhouse and the freezing chamber is maintained similarly.
  • the time difference between the cooling completion points of the two storage chambers is reduced, and the compression operation time is shortened.
  • the efficiency of the refrigerant circulation system can be maximized.
  • thermoelectric element 21 When the freezing chamber temperature is in the satisfactory temperature range shown in FIG. 7 (in the case of standing, a high voltage is applied to the thermoelectric element 21, so that the heart greenhouse temperature quickly enters the satisfactory temperature range.
  • the freezer When the freezer is in a satisfactory temperature range, it is recommended to apply a high voltage to the thermoelectric element 21 because the cooling power of the refrigerant passing through the expansion valve of the freezer can be used to cool the core greenhouse to the maximum.
  • the voltage applied to the thermoelectric element can be set differently depending on which temperature region the current indoor temperature is in. For example, if it is determined that the indoor temperature is in the high temperature region, the first high voltage may be applied to the thermoelectric element. If it is determined that the indoor temperature does not belong to the high-temperature region, a second high voltage lower than the first high voltage may be applied to the thermoelectric element.
  • the first high voltage and the second high voltage are the upper and lower thresholds of the high voltage range, respectively. May be, but limited to 2020/175829 1»(:1 ⁇ 1 ⁇ 2020/002075
  • thermoelectric element 21 It may be controlled to keep it constant, but it may be controlled to increase the voltage applied to the thermoelectric element 21 as the temperature of the freezing chamber decreases.
  • thermoelectric element when the freezer temperature enters from the upper limit temperature region to the unsatisfactory temperature region, the voltage value applied to the thermoelectric element may also be designed to change.
  • thermoelectric element in inverse proportion to the decrease in the freezer temperature. Specifically, if the freezer temperature drops by the set temperature in either the upper limit temperature or the dissatisfied temperature range, the voltage applied to the thermoelectric element is the set value. It may be possible to increase by as much.
  • the heart greenhouse temperature is above the dissatisfaction temperature
  • thermoelectric element 21 In the middle, it is possible to apply the voltage supplied to the thermoelectric element 21 just before the pump down.
  • the maximum voltage can be applied to the thermoelectric element in order to utilize the cooling power of the refrigerant exiting the evaporation chamber for maximum core greenhouse cooling while the refrigerant exits the evaporation chamber during the pump-down process.
  • thermoelectric element As described above, the voltage applied to the thermoelectric element is different depending on the situation in the warehouse.
  • the set voltage can be divided into high voltage, medium voltage, and low voltage.
  • Figure 8 is presented to explain the criteria for determining the low voltage and high voltage range This is a graph showing the correlation between the voltage and the cooling power of the thermoelectric element.
  • thermoelectric element [300] Referring to Figure 8, to determine the low voltage upper limit for the output control of the thermoelectric element
  • the voltage required to generate cooling power corresponding to the thermal insulation load of the core-on case 201 can be determined as the low voltage upper limit.
  • the insulation load (Watt) of the shim-on case 201 corresponds to the insulation capacity of the shim-on case.
  • It is a value determined by, and can be defined as the amount of heat load penetrating from the freezing chamber to the core greenhouse due to the temperature difference between the freezing chamber and the core greenhouse.
  • the unit of the thermal insulation load is the same as the cooling power.
  • the heat insulation load of the heart greenhouse is divided into an insulating wall inside and outside the heart greenhouse.
  • T h External temperature of the cardiac greenhouse
  • T 1 temperature inside the heart chamber
  • cooling power (Q c ) graph of the thermoelectric module is defined as a quadratic function of voltage (or a quadratic function of current), as shown in FIG. 8, when the thermal insulation load (Q i) is calculated, The voltage required to generate cooling power corresponding to the calculated insulation load (Q i), the so-called “minimum insulation load voltage (VJ” and “maximum insulation load voltage (V al )”) are determined.
  • thermoelectric module When voltage is applied to the thermoelectric module, the cooling power of the thermoelectric module can remove the thermal insulation load of the core greenhouse, thereby lowering the temperature of the core greenhouse.
  • thermoelectric module If a voltage higher than the voltage is applied to the thermoelectric module, the cooling power of the thermoelectric module does not completely remove the thermal insulation load of the core greenhouse, so it is possible to prevent the temperature of the heart greenhouse from rising rapidly, but it is not possible to lower the heart greenhouse temperature. none.
  • thermoelectric element the low voltage (V L ) applied to the thermoelectric element satisfies 0 ⁇ V L ⁇ V
  • thermoelectric element As an example, as shown in the graph of FIG. 8, assuming that the AT uses a thermoelectric element with 30 O C and the insulation load is less than 20W, the low voltage ( ⁇ ) applied to the thermoelectric element is determined to be less than 10V. Can be
  • thermoelectric element 2020/175829 1»(:1 ⁇ 1 ⁇ 2020/002075
  • the voltage value at which ⁇ 0) becomes 0 (V or less “cooling threshold voltage”) is the upper limit of the voltage.
  • thermoelectric element increases, that is, as the voltage difference applied to the thermoelectric element increases, the cooling power of the thermoelectric element increases.
  • the applied high voltage ( ⁇ ) can be determined as about 35 ⁇ .
  • Figure 9 is to explain the criteria for determining the range of the high voltage range and the medium voltage
  • thermoelectric element This is a graph showing the correlation between the presented voltage versus the cooling power and efficiency of the thermoelectric element.
  • the criteria for determining the range of the low voltage ( ⁇ ) and the high voltage ( ⁇ ) have been described.
  • the high voltage ( ⁇ ) can be divided into two or more ranges, such as the first high voltage (V ratio), the second high voltage « 2 ), a voltage lower than the first high voltage ⁇ ), and the voltage mentioned later. Reveal it.
  • thermoelectric element in order to determine the high voltage range applied to the thermoelectric element, the same as described in FIG. 8, a case of using a thermoelectric element will be described as an example. .
  • the cooling power graph 02 is a cooling power graph in a section in which the voltage is less than 30 ⁇ among the graphs of FIG. 8.
  • thermoelectric element((: ⁇ ! 5 ) is a section that decreases, so it can be said to be unfavorable in terms of the efficiency of the thermoelectric element.
  • thermoelectric module when the voltage applied to the thermoelectric module reaches the efficiency threshold voltage
  • the high voltage applied to the thermoelectric element can be determined as the efficiency threshold voltage.
  • cooling power continues to increase, it may be advantageous to take the cooling power value at the expense of efficiency when considering the overall situation of the heart greenhouse.
  • the high voltage ( ⁇ ) of the thermoelectric element can be determined by the voltage within the following range.
  • the ⁇ 1 above can be 0.8, and the ⁇ 2 above can be 1.2, but it is not limited thereto.
  • the range of high voltage ( ⁇ ) of the thermoelectric module can be set to 11. IV or more and 16 or less, preferably 11 ⁇ or more and ⁇ 1 ⁇ or less.
  • the range of the high voltage ( ⁇ ) is determined, the range of the medium voltage ( ⁇ %0) can be determined as follows.
  • thermoelectric element V ⁇
  • the upper limit of the high voltage applied to the thermoelectric element is the temperature threshold at the point when the amount of temperature change in the heart greenhouse or the rate of temperature change ( ⁇ ) is less than or less than the set value 1)
  • the above setting value () is in accordance with the specifications of the thermoelectric element and the insulation load of the core temperature case (201).
  • a voltage whose temperature change amount is less than 0.1°0 is used as the upper limit of the high voltage.
  • thermoelectric element [343] Summarizing the contents so far, the range of voltage applied to the thermoelectric element can be defined as shown in Table 3 below.
  • the low voltage set for the output control of the thermoelectric element shown in Table 2 is The medium voltage may be 12V, the first high voltage is 16V, and the second high voltage may be 14V, but is not limited thereto, and may vary according to the specifications of the applied thermoelectric element. This depends on the supply voltage according to the specifications of the thermoelectric element. Since the cooling power and efficiency of the thermoelectric element are different, it is obvious that the threshold voltage for each section must be set differently.
  • Table 4 below shows the driving speed of the core greenhouse fan corresponding to the output of the thermoelectric element shown in Table 2 .
  • 11 is a flowchart showing a method of controlling the driving of the core greenhouse fan according to the operation mode of the refrigerator when the core greenhouse mode is on.
  • the cardiac greenhouse mode When the cardiac greenhouse mode is on, it means that the user presses the ventricle greenhouse mode execution button to enable the cardiac greenhouse mode to be executed. Therefore, in the state where the ventricle greenhouse mode is on, the thermoelectric module is used when certain conditions are satisfied. Power can be applied immediately.
  • thermoelectric module when the core greenhouse mode is off, it means that the power supply to the thermoelectric module is cut off. Therefore, power supply to the thermoelectric module and the core greenhouse fan is not performed except in exceptional cases. .
  • control method described with reference to FIGS. 8 to 8 above may also be applied to a method of controlling a voltage applied to a thermoelectric module of a storage room in addition to the core greenhouse.
  • Determining whether or not the core greenhouse is already in operation can be explained by determining whether the current refrigerator operation condition is in the refrigerator chamber alone operation condition or whether the current cardiac greenhouse temperature is in a satisfactory condition.
  • Refrigerating compartment single operation means that the switching valve (13) is
  • thermoelectric module does not perform the function of the cooling member. Since it is in a state of being incapacitated, the core greenhouse fan 25 is controlled not to drive.
  • thermoelectric element [358] In this state, as shown in Table 2, if the refrigerating chamber is operating alone and the refrigerating chamber is not actually operating, a low voltage is applied to the thermoelectric element.
  • This control unit judges whether the stop time of the core greenhouse fan continues for a set time of 0 or more 140)
  • the set time may be 60 minutes, but this is not limited thereto.
  • the core greenhouse fan and the rotating shaft may freeze and may not rotate even when power is applied. Therefore, if the stop state of the core greenhouse fan is maintained for a set time of 0 or longer, the control unit causes the core greenhouse fan to run at low speed. Do 150).
  • the control unit stops the core greenhouse fan 160), judges whether the refrigerator power is off ( ⁇ 70), and terminates the core greenhouse fan driving algorithm, or continuously repeats it. .
  • the above setting time 2 ) for the core greenhouse fan to run at low speed may be 10 seconds, but is not limited thereto.
  • step 120 of determining whether the refrigerator compartment is operating alone if it is determined that the refrigerator compartment is not operating alone and the core greenhouse temperature is not satisfied, a process of determining whether the freezer door is in an open state is performed ( ⁇ 80).
  • the fact that the refrigerating chamber is not a single operation means either the freezing chamber alone operation or the simultaneous operation of cooling the refrigerating chamber and the freezer at the same time.
  • the control unit judges whether the set time 3 ) has elapsed after the start of the freezer operation 190).
  • step 130 the heart greenhouse fan stops or maintains the stopped state.
  • step 30 when the current operating condition satisfies at least one of the above-described conditions of step 20, step 80, and step 90. It can be summed up by controlling. This should be interpreted as including the case where the conditions of step 8120, step 8180, and step 90 are all satisfied.
  • the refrigerant that has passed through the freezer expansion valve 15 is controlled to intensively exchange heat with the freezer cooler for a certain period of time.
  • the above setting time 3 may be 90 seconds, but is not limited thereto.
  • the control unit judges whether the current freezer temperature is a satisfactory temperature 200).
  • control unit can be summarized by allowing the control to proceed to step 3200 if the current operating conditions do not satisfy all the conditions of step 8120, step 8180, and step 90 described above. have.
  • the core greenhouse fan is driven at medium speed 210) and the core greenhouse is cooled to the set temperature.
  • the core greenhouse fan while the core greenhouse fan is running at low or medium speed, it is continuously judged whether the core greenhouse temperature has entered the satisfactory region. That is, the core greenhouse temperature is mounted on the front of the core temperature module and exposed to the core greenhouse cooler. The sensor (not shown) continuously detects the heart greenhouse temperature and transmits the detection result to the control unit.
  • the control unit judges whether or not the heart greenhouse temperature is satisfied based on the transmitted heart greenhouse temperature detection value (230).
  • the freezer door is opened, and in this case, it is necessary to stop the core greenhouse fan immediately. Therefore, if the core greenhouse fan is running and the core greenhouse temperature is not in the satisfactory zone, the control unit continuously or periodically It is necessary to detect whether the freezer door is open.
  • the low speed driving time of the core greenhouse fan has passed the set time 4 ) while the core greenhouse temperature is in the satisfactory range, it is controlled to proceed to the step of stopping the core greenhouse fan (250) and stopping the core greenhouse fan ( ⁇ 30).
  • the step of determining whether the stop time of the heart greenhouse fan exceeds the set time () is repeated.
  • the set time 4 ) above may be 90 seconds, but is not limited thereto.
  • the reason for further driving the heart greenhouse fan for the set time 4 ) after the heart greenhouse temperature enters the satisfaction range is as follows.
  • the power supplied to the thermoelectric element 21 after the heart greenhouse cooling operation is finished. Even if this is cut off, since the cold sink 22 of the module 20 maintains a state below the core greenhouse temperature for a certain period of time, it can be said to supply the cold remaining in the cold sink 22 to the core greenhouse cooler as much as possible.
  • thermoelectric module if the residual cold remaining in the cold sink (22) is utilized to the maximum, the thermoelectric module
  • the control unit when it is determined that the current ventricular greenhouse mode is on, the control unit separately determines whether the freezer temperature is satisfied if the current operating conditions do not satisfy all the conditions of steps 8120, 8180, and 90 described above. It is also possible to control the core greenhouse fan to run at a specific speed without unconditionally, where it is noted that the specific speed may include other speeds in addition to low and medium speeds.
  • step 3200 it is possible to proceed directly to step 3200, or to proceed to the step of rotating the core greenhouse fan at the specific speed. Do.

Abstract

본 발명의 실시예에 따른 냉장고의 제어 방법은, 심온실 모드가 온 상태이면, 상기 냉장고의 운전 모드에 따라 상기 열전 모듈에 저전압, 중전압, 고전압 및 역전압 중 어느 하나가 걸리도록 제어되고, 상기 심온실의 온도가 만족 온도 영역에 있다고 판단되면, 상기 제어부는, 상기 열전 모듈에 저전압이 걸리도록 하는 것을 특징으로 한다.

Description

2020/175829 1»（：1^1{2020/002075 명세서
발명의 명칭:냉장고의제어방법
기술분야
[1] 본발명은냉장고의제어방법에관한것이다.
배경기술
[2] 일반적으로냉장고는음식물을저온으로저장하는가전기기로서 ,섭씨 3°0 범위의냉장상태로음식물을저장하기위한냉장실과,섭씨 -20°0범위의냉동 상태로음식물을저장하기위한냉동실을포함한다.
[3] 그러나,육류나해산물같은음식물을현재의냉동실내에서냉동상태로
보관는경우,음식물이 -20ᄋ（:로결빙되는과정에서육류나해산물의세포내에 있는수분이세포밖으로빠져나가면서세포가파괴되고해동과정에서식감이 변해버리는현상이발생한다.
[4] 그러나,저장실의온도조건을현재의냉동실온도보다현저히낮은극저온 상태로만들어서，음식물이냉동상태로변화될때빙결점온도대역을빠르게 지나가도록하면세포파괴를최소화할수있으며,그결과해동후에도육질과 식감이냉동전의상태에가까운상태로되돌아올수있는장점이있다.상기 극저온이라함은 -45°0 ~ -50°0범위의온도를말하는것으로이해될수있다.
[5] 이러한이유때문에,최근에는냉동실온도보다더낮은온도로유지되는
심온실이구비된냉장고에대한수요가증가하고있는추세에있다.
[6] 심온실에대한수요를만족시키기위해서는기존의냉매를이용한냉각에는 한계가있기때문에,열전소자（TEM : 1¾ 1110£1 仕노 Module）를이용하여심온실 온도를극저온으로낮추는시도를하고있다.
[7] 한국공개특허제 10-2018-0105572호（2018년 09월 28일）호（선행기술 1）에는열전 모듈을이용하여저장실을실내온도보다낮은온도로저장하는협탁형태의 냉장고가개시된다.
[8] 그러나,상기선행기술 1에개시되는열전모듈을이용한냉장고의경우,열전 모듈의발열면이실내공기와열교환하여냉각되는구조로이루어져있어서, 흡열면의온도를낮추는데한계가있다.
[9] 상세히,열전모듈은,공급전류가증가하면흡열면과발열면의온도차가어느 수준까지는증가하는경향을보인다.그러나,반도체소자로이루어진열전 소자의특성상,공급전류가증가하면반도체가저항으로작용하여자체 발열량이증가한다.그러면,흡열면에서흡수된열이발열면으로신속하게 전달되지못하는문제가발생한다.
[1이 뿐만아니라,열전소자의발열면이충분히냉각되지아니하면발열면으로 전달된열이흡열면쪽으로역류하는현상이발생하여흡열면의온도도함께 증가하게된다. 2020/175829 1»（：1^1{2020/002075
[11] 상기선행기술 1에 개시되는열전모듈의 경우,발열면이실내공기에의하여 냉각되므로,발열면의온도가실내온도보다더낮아질수없는한계가있다.
[12] 발열면의온도가실질적으로고정된상태에서,흡열면의온도를낮추기
위해서는공급전류를증가시켜야하고,그러면열전모듈의 효율이 저하되는 문제가발생한다.
[13] 또한,공급전류를증가시키면,흡열면과발열면의온도차가커지면서 열전 모듈의 냉력이감소하는결과를초래한다.
[14] 따라서,선행기술 1에 개시되는냉장고의 경우,저장실의온도를냉동실
온도보다현저히낮은극저온으로낮추는것이불가능하고,냉장실온도 수준으로유지할수있는정도에불과하다고할수있다.
[15] 뿐만아니라,선행기술 1에 개시된내용을보면,열전모듈에 의하여 냉각되는 저장실이독립적으로존재하기 때문에,상기 저장실의온도가만족온도에 도달하면열전모듈로의 전원공급을차단하는것으로개시된다.
[16] 그러나,상기 저장실이 냉장실이나냉동실과같은만족온도영역이다른
저장실내부에수용되는경우,두개의 저장실온도를조절하기위해서
고려되어야하는요소들이 많아지게된다.
[17] 따라서,선행기술 1에 개시되는제어내용만으로는,심온실이 냉동실또는
냉장실에수용되는구조에서심온실온도를제어하기위해서 열전모듈의 출력과심온실냉각팬의출력제어가불가능하다.
[18] 이러한열전모듈의 한계를극복하고,열전모듈을이용하여 저장실의온도를 냉동실온도보다낮은온도로낮추기 위하여 많은실험과연구가이루어져 왔다. 그결과,열전모듈의 발열면을낮은온도로냉각시키기 위하여 냉매가흐르는 증발기를발열면에부착하는시도가있었다.
[19] 한국공개특허제 10-2016-097648호（2016년 08월 18일）（선행기술 2）에는열전 모듈의 발열면을냉각시키기 위하여,열전모듈의발열면을증발기에직접 부착시키는내용이 개시된다.
[2이 그러나선행기술 2도여전히문제점을안고있다.
[21] 선행기술 2에는,열전모듈의 발열면을냉각시키는증발기와,냉동실증발기 간의운전제어 방법이 전혀 기술되어 있지 아니하다.상세히,열전모듈에 의하여 냉각되는소위심온실이 냉동실내부에수용되기 때문에,냉동실과 심온실중어느하나또는모두에부하가투입되었을때,어떤저장실을 우선으로하여부하대응운전을할지에 대한냉매순환시스템의제어 방법에 대한내용이 전혀 개시되지못하고있다.
[22] 선행기술 2에는,냉동실외에 냉장실에부하가투입되었을경우,부하대응 운전을어떻게수행할지에 대한내용이 전혀기술되어 있지아니하다.이는곧, 증발기를열전소자의 발열면냉각수단으로사용하는구조에 대해서만연구가 되었고,실제로냉장고에 적용하였을경우,부하투입에 따라발생하는
문제점들과,이러한문제점들을제거하기 위한제어 방법에 대해서는연구가 2020/175829 1»（：1/10公020/002075
3 이루어지지못하였다는것을말한다.
일예로,냉동실에부하가투입되면냉동실내부에습기가발생하는데,상기 습기를신속히제거하지 아니하면,습기가심온실의 외벽에부착되어성에를 형성하는문제를초래한다.
24] 특히,냉장실과냉동실에동시에부하가투입되었을때,냉장실부하대응 운전이우선적으로수행되고,냉동실부하대응운전은수행되지 않는다.즉, 냉장실부하대응운전중에는냉동실에부하가투입되어도냉동실팬이 구동하지 않기 때문에,냉동실내부에서발생하는습기가심온실외벽에 부착되어성장하는것을막지못하는문제가발생한다.
뿐만아니라,냉장실이 설치되는실내공간이겨울과같이 저온영역에 있는 경우,냉동실팬의운전율이낮기 때문에 냉동실내부에 발생한습기를신속하게 제거하지못하여 ,심온실외벽에성에가생성되는문제가발생할수있다.
[26] 더욱심각한문제는,심온실외벽에성에가생성되면,사용자가직접
물리적으로성에를제거하거나,냉동실운전을정지하여 냉동실온도가성에를 녹이는온도로증가할때까지기다리는방법외에는적절한방법이 없다는 것이다.
사용자가도구如01）를이용하여심온실외벽에부착된성에를제거하면, 심온실외벽이손상되는문제가발생할수있다.
냉동실운전을정지하여성에를녹이는방법을선택하면,냉동실에 저장된 음식물을다른곳으로옮기지 않으면음식물이상하게되는문제가발생할수 있다.
[29] 심온실이 냉동실내부에수용되는구조의 냉장고가이와같은심각한문제를 안고있음에도불구하고,상기선행기술 2에는이러한예측가능한문제에 대한 언급이 전혀 없으며,발생한문제에 대한대응방법에 대한언급도전혀 없다.
2 2 22 3 302735811 발명의상세한설명
기술적과제
본발명은상기에서제시한예상되는문제점을개선하기위하여 제안된다.
[3 특히，심온실이상대적으로온도가낮은냉동실에수용되어 있는구조에서 , 냉동실의 열부하가상기심온실로침투하여심온실온도가상승하는것을 방지할수있는열전소의출력제어 방법을제공하는것을목적으로한다. 또한,심온실과냉동증발실이 인접하게 배치되어 있는냉장고의구조에서, 냉동증발실의 열부하가상기심온실로침투하여심온실온도가상승하는것을 방지할수있는열전소자의출력제어 방법을제공하는것을목적으로한다.
[33] 또한,냉동실이제상운전중이거나,냉장실단독운전중이거나,냉장실및 냉동실동시운전중일때,심온실로열부하가침투하는것을방지하여심온실이 설정온도로유지되도록할수있는열전소자의출력 제어방법을제공하는 것을목적으로한다. 2020/175829 1»（：1^1{2020/002075
[34] 또한,심온실온도제어를위하여 열전소자의출력제어와함께심온실팬의 출력을제어하는방법을제공하는것을목적으로한다.
과제해결수단
[35] 상기와같은목적을달성하기 위한본발명의실시예에 따른냉장고의 제어 방법은,심온실모드가온상태이면,상기 냉장고의운전모드에 따라상기 열전 모듈에 저전압,중전압,고전압및 역전압중어느하나가걸리도록제어되고, 상기심온실의온도가만족온도영역에 있다고판단되면,상기제어부는,상기 열전모듈에 저전압이 걸리도록하여,냉동실또는증발실로부터심온실내부로 열부하가침투하는것을방지하도록한다.
[36] 또한,냉동실제상운전이수행되는동안에는열전모듈에 역전압이 걸리도록 하여,심온실제상이함께수행되도록한다.
[37] 또한,심온실이불만족상태이고,냉장실단독운전중일때에는열전모듈에 저전압이 걸리도록하여 ,히트싱크가과열되어콜드싱크쪽으로열이 역류하는 것을방지하도록한다.
[38] 또한,심온실이불만족상태이고,냉동실냉각운전중일때에는,냉동실의 온도와실내온도에 따라서 저속과중속중어느하나의속도로심온실팬이 구동하도록하여,심온실과냉동실이 비슷한시점에 만족온도에도달하도록 한다.
발명의효과
[39] 상기와같은구성을이루는본발명의실시예에따른냉장고의제어 방법에 의하면다음과같은효과및장점이 있다.
[4이 첫째 ,심온실모드가온인상태에서는,심온실온도가만족온도영역로
유지되는경우에도열전모듈로저전압이 공급되도록함으로써,상기 열전 모듈을통하여 냉동증발실로부터심온실로열부하가전달되는것을방지할수 있는효과가있다.
[41] 둘째,냉장실과냉동실동시운전상황에서는열전모듈로중전압이
공급되도록함으로써,냉동실과심온실이동시에 냉각되어,냉동실과심온실중 어느하나의 냉각도중에다른하나의부하가증가하는가능성을최소화할수 있는장점이 있다.
[42] 셋째,열전모듈의 히트싱크와냉동실증발기가직렬로연결된냉매순환 시스템에서,냉동실온도가만족상태에 있는경우,열전모듈로고전압을 공급함으로써,심온실을신속히 냉각시킬수있는장점이 있다.
[43] 뿐만아니라,열전모듈로고전압을공급하여,심온실의 열부하를최대한히트 싱크로전달함으로써,압축기의 입구에 연결된석션파이프로유입되는액상 냉매의 양을최소화할수있는장점이 있다.
[44] 넷째 ,히트싱크로냉매가흐르지 않는상태에서는열전모듈로의 전원공급을 최소화함으로써 ,열전모듈의발열면으로부터흡열면으로열부하가역류하는 현상을최소화할수있는장점이 있다.
[45] 다섯째 ,냉동실증발기의제상운전이수행될때 ,열전소자로역전압을걸어서 열전소자의제상운전이함께수행되도록함으로써 ,냉동실증발기의제상 과정에서발생하는증기가심온실내부로침투하여심온실내벽또는열전모듈 표면에결빙되는현상을방지할수있는장점이 있다.
도면의간단한설명
[46] 도 1은본발명의실시예에따른제어방법이적용되는냉장고의냉매순환 시스템을보여주는도면.
[47] 도 2는본발명의실시예에따른냉장고의냉동실과심온실구조를보여주는 사시도.
[48] 도 3은도 2의 3-3을따라절개되는종단면도.
[49] 도 4는입력전압및푸리에효과에대한냉력의관계를보여주는그래프.
[5이 도 5는입력전압및푸리에효과에대한효율관계를보여주는그래프.
[51] 도 6은전압에따른냉력과효율의상관관계를보여주는그래프.
[52] 도 7은고내부하변동에따른냉장고제어를위한기준온도선을보여주는 도면.
[53] 도 8은저전압과고전압범위를결정하는기준을설명하기위해제시되는
전압과열전소자의냉력과의상관관계를보여주는그래프
[54] 도 9는고전압범위및중전압의범위를결정하는기준을설명하기위해
제시되는전압대비열전소자의냉력및효율과의상관관계를보여주는그래프
[55] 도 W은열전소자의고전압상한값을설정하는기준을설명하기위해
제시되는전압대비심온실온도변화관계를보여주는그래프
[56] 도 11은심온실모드가온일때냉장고의운전모드에따른심온실팬의구동 제어방법을보여주는플로차트.
발명의실시를위한형태
[57] 이하에서는본발명의실시예에따른냉장고의제어방법에대하여도면을 참조하여상세히설명한다.
[58] 본발명에서제 1냉각기 (first cooling device)에의해냉각되어소정의온도로 제어될수있는저장실을제 1저장실로정의할수있다.
[59] 또한,제 2냉각기에의해냉각되어상기제 1저장실보다낮은온도로제어될 수있는저장실을제 2저장실로정의할수있다.
[6이 또한,제 3냉각기에의해냉각되어상기제 2저장실보다낮은온도로제어될 수있는저장실을제 3저장실로정의할수있다.
[61] 상기제 1저장실을냉각하기위한상기제 1냉각기는,제 1증발기와,열전 소자를포함하는제 1열전모듈중적어도하나를포함할수있다.상기제 1 증발기는후술할냉장실증발기를포함할수있다.
[62] 상기제 2저장실을냉각하기위한상기제 2냉각기는,제 2증발기와, 2020/175829 1»（：1^1{2020/002075
6 열전소자를포함하는제 2열전모듈중적어도하나를포함할수있다.상기제 2 증발기는후술할냉동실증발기를포함할수있다.
[63] 상기제 3저장실을냉각하기위한상기제 3냉각기는,제 3증발기와
열전소자를포함하는제 3열전모듈중적어도하나를포함할수있다.
[64] 본명세서에서 열전모듈을냉각수단으로하는실시예들에서,열전모듈대신 증발기로대체하여 적용가능하며 ,예를들면다음과같다.
[65] (1) "열전모듈의콜드싱크’’또는 "열전소자의흡열면’’또는 "열전모듈의
흡열측”은, "증발기또는증발기의 일측”으로해석될수있다.
[66] (2)’’열전모듈의흡열측’’은, "열전모듈의콜드싱크’’또는 "열전모듈의
흡열면”과동일한의미로해석될수있다.
[67] (3)제어부가”열전모듈에정전압을인가또는차단하는것”은, "증발기로
냉매를공급또는차단하는것 ",”절환밸브가개방또는폐쇄되도록제어되는 것 ",또는 "압축기가온또는오프되도록제어되는것과동일한의미로해석될수 있다.
[68] (4)제어부가”열전모듈에 인가되는정전압이증가또는감소되도록제어하는 것”은, "증발기에흐르는냉매의 양또는유속이증가또는감소되도록제어하는 것”,”절환밸브의 개도가증가또는감소되도록제어하는것”,압축기출력이 증가또는감소되도록제어하는것”과동일한의미로해석될수있다.
[69] (5)제어부가”열전모듈에 인가되는역전압이증가또는감소되도록제어하는 것”은, "증발기에 인접하는제상히터에 인가되는전압이증가또는감소되도록 제어하는것”과동일한의미로해석될수있다.
이 한편,본명세서에서 ”열전모듈에의하여 냉각되는저장실”을저장실쇼로
정의하고, "상기 열전모듈에 인접하는곳에위치하여상기 저장실쇼내부의 공기가상기 열전모듈의흡열면과열교환하도록하는팬”을 "저장실쇼팬”으로 정의할수있다.
1] 또한,상기 저장실쇼와함께 냉장고를구성하면서 냉각기에의해 냉각되는 저장실을 "저장실 ’로정의할수있다.
2] 또한, "냉각기 챔버 "는냉각기가위치하는공간으로정의하고,냉각기에서
생성된냉기를송풍하는팬이추가된구조에서는상기 팬이수용되는공간을 포함하는것으로정의하고,상기 팬에의해송풍되는냉기를저장실로안내하는 유로나제상수가배줄되는유로가주가된구조에서는상기유로들을포함하는 것으로정의할수있다.
3] 또한,콜드싱크나그주변에착상된성에나얼음을제거하기 위해상기콜드 싱크의 일측에위치하는제상히터를콜드싱크제상히터로정의할수있다. 4] 또한,히트싱크나그주변에착상된성에나얼음을제거하기 위해상기 히트 싱크의 일측에위치하는제상히터를히트싱크제상히터로정의할수있다. 5] 또한,냉각기나그주변에착상된성에나얼음을제거하기위해상기 냉각기의 일측에 위치하는제상히터를냉각기 제상히터로정의할수있다. 6] 또한,냉각기챔버를형성하는벽면이나그주변에착상된성에나얼음을 제거하기위해상기냉각기챔버를형성하는벽면의일측에위치하는제상 히터를냉각기챔버제상히터로정의할수있다.
7] 또한,콜드싱크나그주변에서녹은제상수나수증기가배출되는과정에서， 재결빙또는재착상을최소화하기위하여상기콜드싱크의일측에배치되는 히터를콜드싱크드레인히터로정의할수있다.
8] 또한,히트싱크나그주변에서녹은제상수나수증기가배출되는과정에서 , 재결빙또는재착상을최소화하기위하여상기히트싱크의일측에배치되는 히터를히트싱크드레인히터로정의할수있다.
9] 또한,냉각기나그주변에서녹은제상수나수증기가배출되는과정에서 , 재결빙또는재착상을최소화하기위하여상기냉각기의일측에배치되는 히터를냉각기드레인히터로정의할수있다.
[8이 또한,냉각기챔버를형성하는벽면이나그주변에서녹은제상수나수증기가 배출되는과정에서,재결빙또는재착상을최소화하기위하여상기냉각기 챔버를형성하는벽면의일측에배치되는히터를냉각기챔버드레인히터로 정의할수있다.
[81] 또한,아래에서설명될 "콜드싱크히터”는상기콜드싱크제상히터의기능과 상기콜드싱크드레인히터의기능중적어도하나의기능을수행하는히터로 정의할수있다.
[82] 또한, "히트싱크히터 "는상기히트싱크제상히터의기능과상기히트싱크 드레인히터의기능중적어도하나의기능을수행하는히터로정의할수있다.
[83] 또한,”냉각기히터”는,상기냉각기제상히터의기능과상기냉각기드레인 히터의기능중적어도하나의기능을수행하는히터로정의할수있다.
[84] 또한,아래에서설명될 "백히터 (back heater)”는상기히트싱크히터의기능과 상기냉각기챔버제상히터의기능중적어도하나의기능을수행하는히터로 정의할수있다.즉,상기백히터는,히트싱크제상히터，히터싱크드레인히터， 및냉각기챔버제상히터의기능들중적어도하나의기능을수행하는히터로 정의할수있다.
[85] 본발명에서는일례로,상기제 1저장실은상기제 1냉각기에의해영상의 온도로제어될수있는냉장실을포함할수있다.
[86] 또한,상기제 2저장실은,상기제 2냉각기에의해영하의온도로제어될수 있는냉동실을포함할수있다.
[87] 또한,상기제 3저장실은,상기제 3냉각기에의해극저온 (cryogenic
temperature)또는초저온 (ultrafrezing temperature)의온도로유지될수있는 심온실 (deep freezing compartment)을포함할수있다.
[88] 또한,본발명은,상기제내지제 3저장실이모두영하의온도로제어되는
경우와,상기제 1내지제 3저장실이모두영상의온도로제어되는경우,및 상기제 1및제 2저장실은영상의온도로제어되고,상기제 3저장실은영하의 2020/175829 1»（：1^1{2020/002075
8 온도로제어되는경우를배제하지 않는다.
[89] 본발명에서 냉장고의 "운전”은운전시작조건또는운전투입조건이
만족되는지 여부를판단하는단계 (I)와,운전투입조건이만족된경우에미리 정해진운전이수행되는단계 (II)와,운전완료조건이 만족되는지 여부를 판단하는단계 (III),및운전완료조건이 만족된경우에는운전이종료되는 단계 (IV)의 4가지운전단계를포함하는것으로정의될수있다.
[9이 본발명에서 냉장고의 저장실냉각을위한”운전”은,일반운전과특수
운전으로구분하여정의될수있다.
[91] 상기 일반운전은,저장실도어의 개방이나음식물저장에따른부하투입
상황이 발생하지 않은상태에서자연적으로고내온도가상승하였을때 수행되는냉각운전을의미할수있다.
[92] 상세히,저장실의온도가불만족온도영역 (아래에서도면을참조하여상세히 설명함)에 진입하여운전투입조건이 만족되면,상기 저장실의 냉각을위해 제어부가상기 저장실의 냉각기로부터 냉기가공급되도록제어하는것으로 정의된다.
[93] 구체적으로,일반운전은냉장실냉각운전,냉동실냉각운전,심온실냉각운전 등을포함할수있다.
[94] 반면,상기특수운전은,상기 일반운전으로정의되는운전을제외한운전을 의미할수있다.
[95] 상세히 ,상기특수운전은,저장실의제상주기가경과하여 냉각기에착상된 성에나얼음을녹이기 위해상기 냉각기에 열을공급하도록제어되는제상 운전을포함할수있다.
[96] 또한,상기특수운전은,저장실의도어가개방된후닫힌시점으로부터 설정 시간이 경과한경우,또는설정시간이 경과하기 전에 저장실의온도가설정 온도로상승한경우중적어도하나에해당되어운전투입조건이만족되면, 상기 저장실에침투한열부하를제거하기 위해상기 냉각기로부터상기 저장실로냉기가공급되도록제어되는부하대응운전을더포함할수있다.
[97] 상세히 ,상기부하대응운전은,저장실도어의 개폐동작이후에 저장실내부로 침투한부하를제거하기 위하여수행되는도어부하대응운전과,냉장고설치 후처음으로전원이 인가되었을때 저장실내부의부하를제거하기 위하여 수행되는초기 냉기동운전을포함할수있다.
[98] 예를들면,상기 제상운전은,냉장실제상운전,냉동실제상운전,및심온실 제상운전중적어도하나를포함할수있다.
[99] 또한,상기도어부하대응운전은,냉장실도어부하대응운전,냉동실도어 부하대응운전,심온실부하대응운전중적어도하나를포함할수있다.
[100] 여기서,상기심온실부하대응운전은,심온실도어가개방에따라부하가 증가되었을때수행되는심온실도어부하대응운전투입조건,심온실오프 상태에서온상태로전환되었을때심온실내의부하를제거하기 위해수행되는 심온실초기냉기동운전투입조건,및심온실제상운전이완료된이후에 처음으로시작되는제상후운전투입조건중적어도하나의조건이만족되면 수행되는,심온실부하제거를위한운전을의미하는것으로해석될수있다.
[101] 상세히,심온실도어부하대응운전투입조건이만족되었는지여부를
판단하는것은,냉동실도어와심온실도어중적어도하나가개방후닫힌 시점으로부터일정시간이경과하는조건,또는일정시간이내에심온실온도가 설정온도로상승하는조건중적어도하나가만족되는지를판단하는것을 포함할수있다.
[102] 또한,심온실초기냉기동운전투입조건이만족되었는지여부를판단하는 것은,냉장고전원이켜지고,심온실모드가오프상태에서온상태로
전환되었는지여부를판단하는것을포함할수있다.
[103] 또한,심온실제상후운전투입조건이만족되었는지여부를판단하는것은, 콜드싱크히터오프,백히터오프,콜드싱크제상을위해열전모듈에인가되는 역전압중단,콜드싱크제상을위해역전압이인가된후히트싱크제상을위해 열전모듈에인가되는정전압중단,히트싱크를수용하는하우징의온도가설정 온도로상승,및냉동실제상운전종료중적어도하나를판단하는것을포함할 수있다.
[104] 따라서,냉장실과냉동실및심온실중적어도하나를포함하는저장실의
운전은,저장실일반운전과,저장실특수운전을포함하는것으로정리될수 있다.
[105] 한편,상기에서설명된저장실의운전중 2가지운전이중돌하는경우,
제어부는어느하나의운전 (운전서이우선하여수행되고다른하나의 운전 (운전피은중단 (pause)되도록제어할수있다.
[106] 본발명에서운전의충돌은, i)운전 A의투입조건과운전 B의투입조건이 동시에만족하여동시에충돌하는경우, ii)운전 A의투입조건이만족되어운전 A가수행되는중에운전 B의투입조건이만족되어충돌하는경우, iii)운전 B의 투입조건이만족되어운전 B가수행되는중에운전 A의투입조건이만족되어 충돌하는경우를포함할수있다.
[107] 2가지운전이충돌하는경우,제어부는,충돌하는운전의수행우선순위를 결정하고,해당운전의수행을제어하기위해,소위 "충돌제어알고리즘”이 수행되도록한다.
[108] 운전 A가우선수행되고,운전 B가중단된경우를일례로들어설명한다.
[109] 상세히 ,본발명에서는중단된운전 B는운전 A의완료후,아래예시의 3가지 경우중적어도어느하나의과정을따르도록제어될수있다.
[110] a.운전 B의해제 (termination)
[111] 운전 A가완료되면,운전 B의수행은해제되어상기충돌제어알고리즘을 종료하고,그이전의운전단계로되돌아가는가도록할수있다.
[112] 여기서 "해제”는,중단된상기운전 B는더이상수행되지않을뿐아니라,운전 B의투입조건이만족되었는지여부도판단하지않는다.즉,운전 B의투입 조건에대한판단정보가초기화되는것으로볼수있다.
[113] b.운전 B의투입조건재판단（redetermination）
[114] 우선수행된운전 A가완료되면,제어부는상기중단된운전 B의투입조건이 만족되었는지여부를다시판단하는단계로되돌아가서,운전 B의
재시작（restart）여부를결정할수있다.
[115] 예컨대,운전 B는 10분동안팬을구동하는운전이고,운전 A와충돌하여운전 시작후 3분이경과된시점에서운전이중단되었다면,운전 A가완료된 시점에서운전모의투입조건이만족되었는지여부를다시판단하고,
만족되었다고판단되면다시 W분동안팬을구동하도록한다.
[116] c.운전 B의속행（continuation）
[117] 우선수행된운전 A가완료되면,제어부는중단되었던상기운전 B가
속행되도록할수있다.여기서 "속행”은,처음부터다시시작하는것이아니라, 중단된운전을이어서수행하는것을의미한다.
[118] 예컨대,운전 B가 W분동안팬을구동하는운전이고,운전 A와충돌하여운전 시작후 3분이경과된시점에서운전이중단되었다면,운전 A가완료된 시점부터곧바로잔여시간 7분동안압축기가더구동하도록한다.
[119] 한편,본발명에서운전의우선순위는아래와같이정해질수있다.
[120] 첫째,일반운전과특수운전이충돌하면,상기특수운전이우선하여
수행되도록제어할수있다.
[121] 둘째,일반운전간의충돌이발생하는경우운전의우선순위는아래와같이 정해질수있다.
[122] I.냉장실냉각운전과냉동실냉각운전이충돌하면,냉장실냉각운전이
우선하여수행되도록할수있다.
[123] II.냉장실（또는냉동실）냉각운전과심온실냉각운전이충돌하면,
냉장실（또는냉동실）냉각운전이우선하여수행되도록할수있다.이때,심온실 온도가지나치게상승하는것을막기위해,상기심온실냉각기의최대냉력보다 낮은수준의냉력이심온실냉각기로부터상기심온실로공급되도록할수있다.
[124] 상기냉력은,냉각기자체의냉각능력과,냉각기에인접한곳에위치하는냉각 팬의송풍량중적어도하나를의미할수있다.예를들어,심온실의냉각기가 열전모듈인경우,제어부는,냉장실（또는냉동실）냉각운전과심온실냉각운전이 충돌하면,냉장실（또는냉동실）냉각운전을우선하여수행하되,열전모듈에 인가될수있는최대전압보다낮은전압이열전모듈에입력되도록제어할수 있다.
[125] 셋째,특수운전간의충돌이발생하는경우운전의우선순위는아래와같이 정해질수있다.
[126] I.냉장실도어부하대응운전과냉동실도어부하대응운전이충돌하면,
제어부는냉장실도어부하대응운전이우선하여수행되도록제어할수있다. 2020/175829 1»（：1^1{2020/002075
11
[127] 11.냉동실도어부하대응운전과심온실도어부하대응운전이충돌하면,
제어부는심온실도어부하대응운전이우선하여수행되도록제어할수있다.
[128] III.냉장실운전과심온실도어부하대응운전이충돌하면,제어부는냉장실 운전과심온실도어부하대응운전이동시에수행하도록제어한후,냉장실 온도가특정온도 &에도달하면,심온실도어부하대응운전이단독으로 수행되도록제어할수있다.심온실도어부하대응운전이단독적으로수행되는 도중에 냉장실온도가다시상승하여특정온도 15知＜15)에도달하면,제어부는 다시 냉장실운전과심온실도어부하대응운전이동시에수행하도록제어할수 있다.이후에도,냉장실온도에따라,상기심온실과냉장실동시운전과심온실 단독운전간의운전전환과정이반복하여수행되도록제어할수있다.
[129] 한편,확장된변형예로,제어부는심온실부하대응운전의운전투입조건이 만족되면,상기 냉장실운전과심온실도어부하대응운전이충돌한경우와 동일하게운전이수행되도록제어할수있다.
[130] 이하에서는,일례로서상기 제 1저장실이 냉장실,상기 제 2저장실이 냉동실, 상기 제 3저장실이심온실인경우로한정하여 설명한다.
[131] 도 1은본발명의실시예에따른냉장고의 냉매순환시스템을보여주는
도면이다.
[132] 도 1을참조하면,본발명의실시예에따른냉매순환시스템 (10)은,냉매를 고온고압의기체 냉매로압축하는압축기 (11)와,상기 압축기 (11)로부터 토출되는냉매를고온고압의 액상냉매로응축하는응축기 (12)와,상기 응축기 (12)로부터토출되는냉매를저온저압의 2상냉매로팽창시키는 팽창변과,상기 팽창변을통과한냉매를저온저압의기체 냉매로증발시키는 증발기를포함한다.상기증발기로부터토출되는냉매는상기 압축기 (11)로 유입된다.상기의구성들은냉매 배관에의하여서로연결되어 폐회로를 구성한다.
[133] 상세히,상기 팽창변은,냉장실팽창변 (14)과냉동실팽창변 (15)을포함할수 있다.상기응축기 (12)의출구측에서 냉매배관은두갈래로나뉘어지고,두 갈래로나뉘어지는냉매 배관에상기 냉장실팽창변 (14)과상기 냉동실 팽창변 (15)이각각연결된다.즉,상기 냉장실팽창변 (14)과냉동실팽창변 (15)은 상기응축기 (12)의출구에서 병렬연결된다.
[134] 상기응축기 (12)의출구측에서 냉매배관이두갈래로나뉘어지는지점에 절환 밸브 (13)가장착된다.상기 절환밸브 (13)의 개도조절동작에의하여상기 응축기 (12)를통과한냉매가상기 냉장실팽창변 (14)과상기 냉동실팽창변 (15) 중어느한쪽으로만흐르거나,양쪽으로나뉘어흐를수있다.
[135] 상기절환밸브 (13)는삼방밸브일수있고,운전모드에따라서 냉매의흐름 방향이 결정된다.여기서,상기삼방밸브와같은하나의절환밸브가상기 응축기 (12)의출구에장착되어 냉매의흐름방향을제어할수도있고,다른 방법으로상기 냉장실팽창변 (14)과냉동실팽창변 (15)의 입구측에 개폐밸브가 각각장착되는구조도가능할것이다.
[136] 한편,증발기배치방식에대한첫번째예로서,상기증발기는,상기냉장실 팽창변 (14)의출구측에연결되는냉장실증발기 (16)와,상기냉동실
팽창변 (15)의출구측에연결되는직렬연결되는히트싱크 (24)및냉동실 증발기 (17)를포함할수있다.상기히트싱크 (24)및냉동실증발기 (17)는직렬 연결되고,상기냉동실팽창변을통과한냉매는상기히트싱크 (24)를통과한후 상기냉동실증발기 (17)로유입된다.
[137] 두번째예로서,상기히트싱크 (24)는상기냉동실증발기 (17)의출구측에 배치되어,냉동실증발기 ( 17)를통과한냉매가히트싱크 (24)로유입되는구조도 가능함을밝혀둔다.
[138] 세번째예로서 ,상기히트싱크 (24)와냉동실증발기 (17)가상기냉동실
팽창변 (15)의출구단에서병렬연결되는구조를배제하지않는다.
[139] 상기히트싱크 (24)는증발기이지만,심온실냉기와열교환하는목적이아니라 후술할열전모듈의발열면을냉각시키는목적으로제공된다.
[14이 증발기의배치방법에대하여상기에서설명된세가지 예들각각에서 ,상기 절환밸브 (13)와냉장실팽창변 (14)및냉장실증발기 (16)가제거된제 1냉매 순환시스템과,냉장실냉각용증발기,냉장실냉각용팽창변,냉장실냉각용 응축기，냉장실냉각용압축기로이루어지는제 2냉매순환시스템이조합된 복합시스템도가능하다.여기서,상기제 1냉매순환시스템을구성하는 응축기와상기제 2냉매순환시스템을구성하는응축기가독립적으로제공될 수도있고,단일체로이루어지는응축기이되냉매는혼합되지않는복합 응죽기가제공될수도있다.
[141] 한편,심온실을포함하여저장실이 2개인냉장고의냉매순환시스템은,상기 제 1냉매순환시스템만으로구성하면된다.
[142] 이하에서는일례로서상기히트싱크와냉동실증발기 (17)가직렬연결되는 구조로한정하여설명하도록한다.
[143] 상기응축기 (12)에인접하는곳에는응축팬 (121)이장착되고,상기냉장실 증발기 (16)에인접하는곳에는냉장실팬 (161)이장착되며,상기냉동실 증발기 (17)에인접하는곳에는냉동실팬 (1기)이장착된다.
[144] 한편,본발명의실시예에따른냉매순환시스템이구비되는냉장고의
내부에는,상기냉장실증발기 (16)에서생성되는냉기에의하여냉장온도로 유지되는냉장실과,상기냉동실증발기 (16)에서생성되는냉기에의하여냉동 온도로유지되는냉동실,및후술하게될열전모듈에의하여극저온 (cryogenic) 또는초저온 (ultrafrezing)의온도로유지되는심온실 (dee freezing
compartment)(202)이형성된다.상기냉장실과냉동실은상하방향또는좌우 방향으로인접하여배치될수있고,구획벽에의하여서로구획된다.상기 심온실은상기냉동실내부의일측에구비될수있으나,본발명은상기 심온실이냉동실의외부일측에구비되는것을포함한다.상기심온실의냉기와 2020/175829 1»（：1^1{2020/002075
13 상기 냉동실의 냉기가서로열교환하는것을차단하기 위하여단열성능이높은 심온케이스 (201)에 의하여상기심온실 (202)은상기 냉동실로부터구획될수 있다.
[145] 또한,상기 열전모듈은,전원이공급되면한쪽면은열을흡수하고반대면은 열을방출하는특징을보이는열전소자 (21)와,상기 열전소자 (21)의흡열면에 장착되는콜드싱크 ^(加 止 )(22)와,상기 열전소자 (21)의발열면에장착되는 히트싱크 (1 !止)와,상기콜드싱크 (22)와히트싱크간의 열교환을차단하는 단열재 (23)를포함할수있다.
[146] 여기서 ,상기히트싱크 (24)는상기 열전소자 (21)의발열면에 접촉되는
증발기이다.즉,상기 열전소자 (21)의발열면으로전달되는열은상기히트 싱크 (24)내부를흐르는냉매와열교환한다.상기히트싱크 (24)내부를따라 흐르면서상기 열전소자 (21)의 발열면으로부터 열을흡수한냉매는상기 냉동실 증발기 (17)로유입된다.
[147] 또한,상기콜드싱크 (22)의 전방에는냉각팬이구비될수있고,상기 냉각팬은 상기심온실내부후측에 배치되므로심온실팬 (25)으로정의할수있다.
[148] 상기콜드싱크 (22)는상기심온실 (202)내부후방에 배치되어상기
심온실 (202)의 냉기에 노출되도록구성된다.따라서,상기심온실팬 (25)이 구동하여상기심온실 (202)냉기를강제순환시키면,상기콜드싱크 (22)는상기 심온실냉기와열교환을통하여 열을흡수한다음상기 열전소자 (21)의 흡열면으로전달하는기능을한다.상기흡열면으로전달된열은상기 열전 소자 (21)의발열면으로전달된다.
[149] 상기히트싱크 (24)는상기 열전소자 (21)의흡열면에서흡수되어상기 열전 소자 (21)의발열면으로전달된열을다시흡수하여상기 열전모듈 (20)외부로 방출시키는기능을한다.
[150] 도 2는본발명의실시예에따른냉장고의 냉동실과심온실구조를보여주는 사시도이고,도 3은도 2의 3-3을따라절개되는종단면도이다.
[151] 도 2및도 3을참조하면,본발명의실시예에 따른냉장고는냉동실 (102)을 정의하는인너 케이스 (101)와,상기 냉동실 (102)의 내부일측에장착되는심온 냉동유닛 (200)을포함한다.
[152] 상세히，냉장실내부는약섭씨 3ᄋ (:내외로유지되고,상기 냉동실 (102)내부는 약 - 18ᄋ (:내외로유지되는반면,상기심온냉동유닛 (200)내부의온도,즉 심온실 (202)내부온도는약 -50°0내외로유지되어야한다.따라서 ,심온실 (202) 내부온도를 - 50ᄋ (:의극저온으로유지하기위해서는냉동실증발기 외에 열전 모듈 (20)과같은부가적인냉동수단이필요하다.
[153] 더욱상세히,상기심온냉동유닛 (200)은,내부에심온실 (202)을형성하는심온 케이스 (201)와,상기심온케이스 (201)내부에슬라이딩삽입되는심온실 드로어 (203),및상기심온케이스 (201)의후면에장착되는열전모듈 (20)을 포함한다. [154] 상기심온실드로어 (203)가적용되는대신,상기심온케이스 (201)전면일측에 심온실도어가연결되고,상기심온케이스 (201)내부전체가음식물저장 공간으로구성되는구조도가능하다.
[155] 또한,상기인너케이스 (101)의후면은후방으로단차져서,상기냉동실
증발기 (17)가수용되는냉동증발실 (104)을형성한다.또한,구획벽 (103)에 의하여상기인너케이스 (101)의내부공간이상기냉동증발실 (104)과 냉동실 (102)로구획된다.상기열전모듈 (20)은상기구획벽 (103)의전면에고정 장착되고,일부가상기심온케이스 (201)를관통하여상기심온실 (202)내부에 수용된다.
[156] 상세히 ,상기열전모듈 (20)을구성하는상기히트싱크 (24)는,상술한바와 같이,상기냉동실팽창변 (15)에연결되는증발기일수있다.상기
구획벽 (103)에는상기히트싱크 (24)가수용되는공간이형성될수있다.
[157] 상기히트싱크 (24)내부에는냉동실팽창변 (15)을통과하면서 -18OC ~ -20OC? 정도로냉각된 2상냉매가흐르므로,상기히트싱크 (24)의표면온도는 -18OC~ -20OC?로유지된다.여기서,냉동실팽창변 (15)을통과한냉매의온도와압력은 냉동실온도조건에따라달라질수있음을밝혀둔다.
[158] 상기히트싱크 (24)의전면에상기열전소자 (21)의후면이접촉되고,상기열전 소자 (21)에전원이인가되면상기열전소자 (21)의후면은발열면이된다.
[159] 상기열전소자의전면에는상기콜드싱크 (22)가접촉되고,상기열전
소자 (21)에전원이인가되면상기열전소자 (21)의전면은흡열면이된다.
[160] 상기콜드싱크 (22)는알루미늄소재로이루어지는열전도판과,상기
열전도판의전면에서연장되는다수의열교환핀 (fin)을포함할수있고,상기 다수의열교환핀은수직하게연장되고가로방향으로이격배치될수있다.
[161] 여기서,열전도판과열교환핀으로이루어지는열전도체의적어도일부분을 감싸거나수용하는하우징이제공될경우,상기콜드싱크 (22)는,상기열전도체 뿐만아니라상기하우징도포함하는열전달부재로해석되어야한다.이는, 상기히트싱크 (22)에도동일하게적용되어,상기히트싱크 (22)는열전도판과 열교환핀으로이루어지는열전도체뿐만아니라,하우징이제공될경우 하우징을포함하는열전달부재로해석되어야한다.
[162] 상기콜드싱크 (22)의전방에는상기심온실팬 (25)이배치되어,상기
심온실 (202)내부공기를강제순환시킨다.
[163] 이하에서는열전소자의효율및냉력에대하여설명한다.
[164] 열전모듈 (20)의효율은성능계수 (C0P : Coefficient Of Performance)로정의될 수있고,효율식은아래와같다.
Qc
[166] Q c :냉력（Cooling Capacity,열을톱수하는능력） [167] P e :입력 (Input Power,열전소자에 공급된전력)
[168] P e= V父 i
[169] 또한,열전모듈 (20)의 냉력은아래와같이 정의될수있다.
[17이
Figure imgf000017_0001
[171] ＜반도체소재특성 계수＞
[172] a:제벡 (Seebeck)계수 [V/K]
[173] p:비저항 [Qm-1]
[174] k:열전도도 [W/mk]
[175] ＜반도체구조특성＞
[176] L :열전소자두께 :흡열면과발열면의거리
[177] A :열전소자의 면적
[178] ＜시스템사용조건＞
[179] i :전류
[180] V :전압
[181] Th :열전소자의발열면온도
[182] Tc :열전소자이흡열면온도
[183]
[184] 위의 냉력식에서 ,우측첫번째항은펠티어효과 (Peltier Effect)로정의될수 있고,전압차에 의한흡열면과발열면양단간의 이동열량으로정의될수있다. 상기 펠티어효과는전류함수로서 공급전류에 비례하여증가한다.
[185] V = iR식에서 ,열전소자를구성하는반도체는저항으로작용하고,상기
저항을상수로간주할수있으므로,전압과전류는비례관계에 있다고할수 있다.즉,상기 열전소자 (21)에걸리는전압이증가하면전류도증가함을 의미한다.따라서,상기 펠티어효과는전류함수로볼수도있고전압의 함수로 볼수도있다·
[186] 상기 냉력또한전류의 함수또는전압의함수로볼수있다.상기 펠티어
효과는상기 냉력을증가시키는플러스효과로작용한다.즉,공급전압이 커지면펠티어효과가증가하여 냉력이증가한다.
[187] 상기 냉력식에서두번째항은줄효과 (Joule Effect)로정의된다.
[188] 상기줄효과는,저항체에 전류가인가되면열이 발생하는효과를의미한다. 다시 말하면,열전소자에 전원을공급하면열이발생하므로,이는냉력을 감소시키는마이너스효과로작용한다.따라서,열전소자에 공급되는전압이 증가하면줄효과가증가하여 열전소자의 냉력을저하시키는결과를가져온다.
[189] 상기 냉력식에서세번째항은푸리에효과 (Fourier Effect)로정의된다.
[190] 상기푸리에 효과는,열전소자의 양면에온도차가발생하면열전도에 의하여 열이 이동하는효과를의미한다. 2020/175829 1»（：1^1{2020/002075
16
[191] 상세히,상기 열전소자는세라믹 기판으로이루어지는흡열면과발열면,상기 흡열면과발열면사이에 배치되는반도체를포함한다.상기 열전소자에 전압을 걸어주면흡열면과발열면사이에온도차가발생하게된다.상기흡열면을 통하여흡수되는열은반도체를통과하여 발열면으로전달된다.그런데,상기 흡열면과발열면의온도차가발생하면,열전도에 의하여발열면으로부터 흡열면으로열이 역류하는현상이발생하며,이를푸리에효과라고한다.
[192] 상기푸리에 효과는줄효과와마찬가지로냉력을저하시키는마이너스효과로 작용한다.다시 말하면,공급전류가증가하면,열전소자의 발열면과흡열면의 온도차（1¾-孔）,즉 값이 커지게되어 냉력을저하시키는결과를가져온다.
[193] 도 4는입력 전압및푸리에 효과에 대한냉력의관계를보여주는그래프이다.
[194] 도 4를참조하면,푸리에효과는흡열면과발열면의온도차,즉스!의함수로 정의할수있다.
[195] 상세히,열전소자의규격이결정되면,위 냉력식의푸리에효과항에서ᄂ쇼및 값은상수값이 되므로,푸리에효과는쇼1를변수로하는함수로볼수있다.
[196] 따라서,스!가커질수록푸리에 효과값은증가하나푸리에 효과는냉력에
마이너스효과로작용하므로결국냉력은감소하게된다.
[197] 도 4의그래프에서보이는바와같이,전압이 일정한조건하에서스!가클수록 냉력은적음을알수있다.
[198] 또한 를고정한상태,예컨대 가 30ᄋ（:인경우로한정하여 전압변화에 따른냉력 변화를살펴보면,전압값이증가할수록냉력이증가하다가어느 지점에서 최고치를보인후다시감소하는포물선형태를그리게된다.
[199] 여기서 전압과전류는비례관계에 있기 때문에위 냉력식에기재된전류를 전압으로보고동일하게해석하여도무방함을밝혀둔다.
[200] 상세히 ,공급전압（또는전류）이증가함에따라냉력이증가하게되는데이는 위 냉력식으로설명될수있다.먼저
Figure imgf000018_0001
값을고정하였으므로상수가된다. 열전소자의규격 별상기스!값은정해지기 때문에,요구되는스!값에 따라 적정한열전소자의규격을설정할수있다.
[201] 스!가고정되므로상기푸리에효과는상수로볼수있고,결국냉력은
전압（또는전류）의 1차함수로볼수있는펠티어 효과와전압（또는전류）의 2차 함수로볼수있는줄효과의함수로단순화될수있다.
[202] 전압값이 점진적으로증가함에 따라,전압의 1차함수인펠티어 효과의
증가량이 전압의 2차함수인줄효과의증가량보다커서,결과적으로냉력이 증가하는양태를보인다.다시 말하면,냉력이최대가될때까지는줄효과의 함수는상수에가까워서 냉력이 전압의 1차함수에근접하는형태를보이게 된다.
[203] 전압이더증가할수록펠티어 효과에따른이동열량보다줄효과에 의한자체 발열량이 더커지는역전현상이 발생하게되고,그결과냉력은다시감소하는 양태를보이는것을확인할수있다.이는전압（또는전류）의 1차함수인펠티어 2020/175829 1»（：1^1{2020/002075
17 효과와전압（또는전류）의 2차함수인줄효과의함수관계식으로부터더욱 명확하게 이해될수있다.즉,냉력이감소할때는냉력은전압의 2차함수에 근접하는형태를보이게된다.
[204] 도 4의그래프상에서는공급전압이 약 30내지 40¥범위구간,더욱
구체적으로는약 35¥일때냉력이 최대임을확인할수있다.따라서,냉력만 고려한다면열전소자에 30내지 40¥범위 내의 전압차가발생하도록하는것이 좋다고말할수있다.
[205] 도 5는입력 전압및푸리에 효과에 대한효율관계를보여주는그래프이다.
[206] 도 5를참조하면,동일전압대비스!가클수록효율이 적음을확인할수있다. 이는,효율이 냉력에비례하기 때문에 당연한결과라할것이다.
[207] 또한 를고정한상태,예컨대 가 30ᄋ（:인경우로한정하여 전압변화에 따른효율변화를살펴보면,공급전압이증가할수록효율도함께증가하다가 어느시점을경과하면효율이오히려감소하는양태를보인다.이는전압변화에 따른냉력그래프와유사하다고할수있다.
[208] 여기서 ,상기효율（（:。!5）은냉력뿐만아니라입력 전력의 함수이기도하며 , 입력 句은,열전소자（21）의 저항을상수로보면, V 2의 함수가된다.냉력을 V 2 으로나누면효율은결국, 펠티어효과-푸리에효과 로나타낼수있다.
Figure imgf000019_0001
따라서,상기 효율의그래프는도 5에보이는바와같은형태를이룬다고볼수 있다.
[209] 도 5의그래프상에서 효율이최대인지점은열전소자에걸리는전압차（또는 공급전압）가대략 20¥미만인영역에서나타남을확인할수있다.따라서, 요구되는스!가결정되면,그에따라적절한전압을걸어주어효율이 최대가 되도록하는것이좋다.즉,히트싱크의온도와심온실（202）의설정온도가 결정되면스!가결정되고,그에따라서 열전소자에 걸리는최적의 전압차를 결정할수있다.
[210] 도 6은전압에따른냉력과효율의상관관계를보여주는그래프이다.
[211] 도 6을참조하면,상술한바와같이,전압차가커질수록냉력과효율모두
증가후감소하는모습을보여준다.
[212] 상세히 ,냉력이최대가되는전압값과효율이최대가되는전압값이다르게 나타나는것을볼수있는데,이는냉력이최대가될때까지는전압의 1차 함수이고,효율은전압의 2차함수이기 때문으로볼수있다.
[213] 도 6에보이는바와같이 ,일례로서 가 30ᄋ（:인열전소자의경우열전소자에 걸리는전압차가대략 12¥ ~ 17¥범위내에서 열전소자의 효율이가장높게 나오는것을확인할수있다.상기 전압의범위 내에서 냉력은계속해서 증가하는모습을보인다.따라서,냉력을함께고려하여 적어도 12¥이상의 전압차가요구되고,전압차가 14\^일때효율이 최대임을알수있다. [214] 도 7은고내부하변동에따른냉장고제어를위한기준온도선을보여주는 도면이다.
[215] 이하에서는각저장실의설정온도를노치온도 (notch temperature)로정의하여 설명한다.상기기준온도선은임계온도선으로표현될수도있다.
[216] 그래프상에서하측의기준온도선은만족온도영역과불만족온도영역을 구분하는기준온도선이다.따라서,하측의기준온도선아래영역 (서은만족 구간또는만족영역으로정의되고,하측의기준온도선위영역 (피은불만족 구간또는불만족영역으로정의될수있다.
[217] 또한,상측의기준온도선은불만족온도영역과상한온도영역을구분하는 기준온도선이다.따라서 ,상측의기준온도선위영역 (C)은상한영역또는상한 구간으로정의될수있고,특수운전영역으로볼수있다.
[218] 한편,냉장고제어를위한만족/불만족/상한온도영역을정의할때,하측의 기준온도선은만족온도영역에포함되도록하는경우와불만온도영역에 포함되도록하는경우중어느하나로정의될수있다.또한,상측의기준 온도선은불만족온도영역에포함되도록하는경우와상한온도영역에 포함되도록하는경우중하나로정의될수있다.
[219] 고내온도가만족영역 (A)내에 있는경우에는압축기를구동하지않으며, 불만족영역 (피에 있는경우에압축기를구동하여고내온도가만족영역내로 들어오도록한다.
[22이 또한,고내온도가상한영역 (C)에있는경우는,고내로온도가높은음식물이 투입되었거나,해당저장실의도어가개방되어고내부하가급격히증가한 것으로보아부하대응운전을포함하는특수운전알고리즘이수행될수있다.
[221] 도 7의 (a)는냉장실온도변화에따른냉장고제어를위한기준온도선을
보여주는도면이다.
[222] 냉장실의노치온도 (N1)는영상의온도로설정된다.냉장실온도가노치
온도 (N1)로유지되록하기위하여 ,노치온도 (N1)보다제 1온도차 (dl)만큼높은 제 1만족임계온도 (Ni l)로상승하면,압축기를구동하도록제어되고,압축기 구동후상기노치온도 (N1)보다상기제 1온도차 (dl)만큼더낮은제 2만족 임계온도 (N12)로하강하면압축기를정지하도록제어된다.
[223] 상기제 1온도차 (dl)는상기냉장실의노치온도 (N1)로부터증가또는감소된 온도값으로써,상기냉장실온도가설정온도인노치온도 (N1)로유지되는 것으로간주되는온도구간을정의하는제어디퍼런셜 (control differential)또는 제어디퍼런셜온도 (control diffetial temperature)로정의될수있으며,대략 1.5 일수있다.
[224] 또한,냉장실온도가노치온도 (N1)로부터제 2온도차 (d2)만큼더높은제 1 불만족임계온도 (N13)로상승하였다고판단되면특수운전알고리즘이 수행되도록제어된다.상기제 2온도차 (d2)는 4.5OC일수있다.상기제 1불만족 임계온도는상한투입온도로정의될수도있다. 2020/175829 1»（：1^1{2020/002075
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[225] 특수운전알고리즘이수행된이후에고내온도가상기제 1불만족임계
온도보다제 3온도차（（13）만큼더낮은제 2불만족온도에4）로하강하면,상기 특수운전알고리즘의운전을종료한다.상기제 2불만족온도에4）는제 1 불만족온도에3）보다낮으며,상기제 3온도차（（13）는 3.0ᄋ（:일수있다.상기제 2 불만족임계온도에4）는상한해제온도로정의될수있다.
[226] 상기특수운전알고리즘이종료한다음에는압축기의냉력을조절하여고내 온도가상기제 2만족임계온도에2）에도달하도록한후압축기의구동을 정지한다.
[227] 도 7의（비는냉동실온도변화에따른냉장고제어를위한기준온도선을
보여주는도면이다.
[228] 냉동실온도제어를위한기준온도선의형태는냉장실온도제어를위한기준 온도선의형태와동일하되,노치온도어2）및노치온도어2）로부터증가또는 감소하는온도변화량少1ᅩ2太3）이냉장실의노치온도에）와온도
변화량（바,（12,（13）과다를뿐이다.
[229] 상기냉동실노치온도어2）는상술한바와같이 -18°0일수있으나이에
제한되는것은아니다.상기냉동실온도가설정온도인노치온도어2）로 유지되는것으로간주되는온도구간을정의하는제어디퍼런셜온도少1）는 2 일수있다.
[23이 따라서 ,냉동실온도가노치온도어2）보다제 1온도차少1）만큼증가한제 1 만족임계온도어21）로증가하면압축기를구동하고,노치온도어2）보다제 2 온도차少2）만큰증가한제 1불만족임계온도（상한투입온도）（N23）이면특수 운전알고리즘이수행된다.
[231] 또한,압축기구동후냉동실온도가노치온도어2）보다제 1온도차少1）만큼 낮은제 2만족임계온도온도어22）로하강하면압축기구동을정지한다.
[232] 특수운전알고리즘이수행된이후냉동실온도가제 1불만족온도어23）보다 제 3온도차少3）만큼낮은제 2불만족임계온도（상한해제온도）어24）로 하강하면특수운전알고리즘을종료한다.압축기냉력조절을통하여냉동실 온도가제 2만족임계온도어22）로하강하도록한다.
[233] 한편,심온실모드가꺼진상태에서도상기심온실의온도를일정주기를
가지고간헐적으로제어하여심온실온도가과도하게상승하는것을방지할 필요가있다.따라서,심온실모드가꺼진상태에서상기심온실의온도제어는, 도 7의（비에개시되는냉동실온도제어를위한온도기준선을따른다.
[234] 이와같이 ,심온실모드가꺼진상태에서냉동실온도제어를위한기준
온도선이적용되는이유는,심온실이냉동실내부에 있기때문이라고할수 있다.
[235] 즉,심온실모드가오프되어심온실을사용하지않는경우라하더라도,심온실 내부온도는적어도냉동실온도와동일한수준을유지하도록하여야,냉동실 부하가증가되는현상을방지할수있기때문이다. 2020/175829 1»（：1^1{2020/002075
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[236] 따라서 ,심온실모드가꺼진상태에서 ,심온실노치온도는냉동실노치
온도어2）와동일하게설정되어,제 1및제 2만족임계온도와제 1및제 2 불만족임계온도또한냉동실온도제어를위한임계
온도들어21 22 23 24）과동일하게설정된다.
[237] 도 7의切는심온실모드가켜진상태에서심온실온도변화에따른냉장고 제어를위한기준온도선을보여주는도면이다.
[238] 심온실모드가켜진상태,즉심온실이온된상태에서는심온실노치
온도어3）는냉동실노치온도어2）보다현저히낮은온도로설정되며,약 -45°0 - -55ᄋ（:,바람직하게는 -55ᄋ（:일수있다.이 경우,심온실노치온도어3）는열전 소자（21）의흡열면온도에 대응되고,냉동실노치온도어2）는열전소자（21）의 발열면온도에 대응된다고할수있다.
[239] 냉동실팽창변（15）을통과한냉매가히트싱크（24）를통과하므로,히트
싱크（24）와접촉하는열전소자（21）의 발열면의온도는적어도냉동실팽창변을 통과한냉매의온도에 대응하는온도로유지된다.따라서,열전소자의흡열면과 발열면의온도차,즉스!는 32ᄋ（:가된다.
[24이 한편,심온실이설정온도인노치온도어3）로유지되는것으로간주되는온도 구간을정의하는제어 디퍼런셜온도（나）,즉심온실제어 디퍼런셜온도는 냉동실냉동실제어 디퍼런셜온도少1）보다높게설정될수있으며,일례로 3ᄋ（:일 수있다.
[241] 따라서,심온실의제 1만족임계온도어31）와제 2만족임계온도어32）사이 구간으로정의되는설정온도유지 간주구간은냉동실의설정온도유지 간주 구간보다넓다고할수있다.
[242] 또한,심온실온도가노치온도어3）보다제 2온도차知 12）만큼높은제 1불만족 임계온도어33）로상승하면특수운전알고리즘이수행되고,특수운전알고리즘 수행 이후심온실온도가상기 제 1불만족임계온도어33）보다제 3
온도차知 13）만큼낮은제 2불만족임계온도어34）로하강하면특수운전 알고리즘을종료한다.상기제 2온도차知 12）는 5ᄋ（:일수있다.
[243] 여기서 ,심온실의제 2온도차知 12）가냉동실의제 2온도차少2）보다높게
설정된다.다시 말하면,심온실온도제어를위한제 1불만족임계온도어33）와 심온실노치온도어3）간의 간격이 ,냉동실온도제어를위한제 1불만족임계 온도어23）와냉동실노치온도어2）간의간격보다크게설정된다.
[244] 이는,심온실의내부공간이 냉동실에 비하여좁고,심온케이스（201）의 단열 성능이 뛰어나기 때문에심온실내부로투입된부하가외부로방출되는양이 적다.뿐만아니라,심온실온도가냉동실온도에 비하여 현저히낮기 때문에, 심온실내부로음식물과같은열부하가침투하였을때,열부하에 대한반응 민감도가매우높다.
[245] 이 때문에,심온실의 제 2온도차（1112）가냉동실의 제 2온도차少2）와동일하게 설정될경우,부하대응운전과같은특수운전알고리즘의수행빈도가 과도하게높아질수있다.따라서,특수운전알고리즘의수행빈도를낮추어 소비 전력을절감하기 위하여,심온실의제 2온도차 (m2)는냉동실의제 2 온도차 (k2)보다크게설정하는것이좋다.
[246] 한편,이하에서는본발명의실시예에 따른냉장고의 제어방법에 대해서
설명하도록한다.
[247] 이하에서다수의조건들중적어도어느하나를만족하면특정단계를
수행한다고하는내용은,제어부가판단하는시점에서상기다수의조건들중 어느하나만만족하면특정단계를수행한다는의미에 더하여,다수의조건들중 어느하나만,또는일부만,또는전부가반드시 만족되어야특정 단계를 수행한다는의미를포함하는것으로해석되어야한다.
[248] 이하에서는,냉장고가놓인실내의온도와냉장실,냉동실및심온실내부의 온도를고려하여,열전모듈에 인가되는전압및심온실팬의출력 (또는속도)을 제어함으로써 ,심온실온도가안정적으로유지하도록하는제어방법에 대하여 설명한다.
[249] 이를위해서,냉장고의 제어부에는실내온도범위에 따라다수의실내온도 구역 (Room Temperature Zone : RT Zone)으로구분하는룩업 테이블이 저장되어 있을수있다.일례로,아래표 1에보이는바와같이,실내온도범위에따라
8개의실내온도구역 (RT Zone)으로세분화될수있으나.이에제한되는것은 아니다.
[25이 [표 1]
Figure imgf000023_0001
[251] 더욱상세히,실내온도가가장높은온도범위구역을 RT Zone 1 (또는 Z1)으로 정의하고,실내온도가가장낮은온도범위구역을 RT Zone 8(또는 Z8)로정의할 수있으며,차은주로한여름실내상태로볼수있고, Z8은한겨울실내상태로 볼수있다.더 나아가,상기실내온도구역들은대분류와중분류및소분류 형태로그룹화되어분류될수있다.예컨대,상기표 1에보이는바와같이,상기 실내온도구역은,온도범위에따라서 저온구역,중온구역 (또는쾌적 영역),및 고온구역으로정의될수있다.예를들어,현재실내온도가 38OC이상의 온도라면,실내온도는 RT Zone 1에속하며,고온영역에해당한다고볼수있다. 여기서,실내온도구역을정의하는경계온도는표 1에제한되지 않고다양하게 설정될수있을것이다.
[252] 다른예로서,외부온도가높은여름철의경우,표 1에보이는바와같이, RT Zone 2이하를고온영역으로정의할수있는반면,봄,가을또는겨울의경우,
RT Zone 1부터 3까지고온영역으로정의할수있고, RT Zone 4이상을저온 영역으로정의할수도있을것이다.
[253] 아래표 2는냉장고운전상태에따라열전소자에공급되는전압을보여주는 심온실제어를위한열전소자의냉력맵을보여준다.
[254] 심온실모드가오프상태이면,열전소자로전원공급이되지않기때문에, 아래의냉력맵은기본적으로현재심온실모드가온상태일때적용된다고할 수있다.
[255] 상세히,심온실모드가오프인경우에는,심온실온도가극저온으로
유지되도록제어되지않고,냉동실온도와동일한온도로유지되도록제어된다. 따라서,심온실모드가오프일때에는,주기적으로심온실온도센서를온시켜서 심온실온도를감지한다음,심온실온도가냉동실만족온도로유지되도록 심온실팬의온오프주기및시간을제어한다.
[256] 본발명은심온실모드가온상태일때의열전모듈출력제어에관한것이므로, 심온실모드가오프일때의제어방법에대한설명은생략하기로한다.
[257]
[258] [표 2]
Figure imgf000024_0001
[259] 한편,상기표 2에서보이는열전소자의냉력맵에의하면,기본적으로
심온실이온상태에 있고,심온실온도가도 7의 ( 에보이는만족영역 (서내에 있다고판단되면,냉동실증발기의제상운전이수행되고있는중인경우를 제외하고모두저전압이공급되도록하며 ,이를저전압제어또는저전압출력 2020/175829 1»（：1^1{2020/002075
23 제어라고정의한다.만일,심온실온도가만족온도영역으로진입하여 열전 모듈로의 전원공급을차단하면,열전소자의흡열면과발열면의온도차 (ᅀ刀가 형성되지 않고,열전달매체로기능하게된다.열전모듈 (20)의 히트싱크 (24)에 흐르는냉매는냉동실온도수준인 -28ᄋ (:범위로유지되는반면,심온실 (202) 내부온도는극저온인 -58ᄋ (:로유지된다.그러면,상기히트싱크 (24)의 열부하가 상기 열전모듈 (20)를따라심온실 (202)내부로침투하게된다.그결과,열전도 현상에 의하여심온실내부부하가자연적으로증가하게되는현상을초래할수 있다.따라서 ,심온실모드가온상태일때에는,심온실온도가만족온도영역에 있다하더라도저전압을걸어주어 ,열전모듈을통하여심온실내부로열부하가 침투하지못하도록하는것이좋다.
[26이 또한,냉동실제상운전이수행될때에는열전모듈 (20)에 역전압을걸어주어 심온실제상운전이 함께수행되도록한다.여기서,냉동실제상운전이라함은, 냉동실증발기의제상운전을의미하며 ,심온실제상운전이라함은열전모듈의 콜드상크및히트싱크제상운전을의미한다.
[261] 상세히，냉동실제상과심온실제상을함께수행하지 않으면다음과같은
문제점이 발생할수있기 때문에,냉동실제상과심온실제상을함께수행하도록 제어되는것이좋다.
[262] 첫째,열전모듈의 히트싱크와,냉동실증발기가직렬연결되어 있는냉매순환 시스템에서는심온실과냉동실중어느하나가운전상태를유지하기 위해서는 압축기가구동하여야한다.특히 ,심온실냉각운전을위해서는압축기가최대 냉력으로구동하여야한다.
[263] 만일,냉동실제상운전만수행하기 위해서는압축기구동을정지하거나, 냉동실팽창변쪽으로냉매가흐르지못하도록절환밸브 (13)의 개도를 조절하여야한다.여기서,냉동실밸브를잠근다고하는것의의미를,냉동실 팽창변 (15)쪽으로냉매가흐르지못하도록절환밸브 (13)의 개도를조절하는 것으로설명될수있다.
[264] 동일한맥락으로,냉장실밸브를잠근다고하는것은,냉장실팽창변 (14)
쪽으로냉매가흐르지못하도록절환밸브 (13)의 개도를조절하는것으로설명될 수있다.
[265] 동시운전이라함은,냉동실밸브와냉장실밸브를모두열어서,응축기 (12)를 통과한냉매가냉장실팽창변 (14)과냉동실팽창변 (15)으로나뉘어흐르도록 하는것으로설명될수있다.
[266] 냉동실제상을위해서 냉동실밸브를잠그면열전모듈의 히트싱크 (24)가방열 작용을하지못하기 때문에,열전소자의흡열능력이 저하되고,발열면으로부터 흡열면쪽으로열역류가일어나서심온실부하가증가하는문제를초래할수 있다.
[267] 둘째 ,심온실제상을위해서 열전모듈에 역전압을걸면,열전모듈의 발열면은 흡열면이 되어,히트싱크 (24)를따라흐르는냉매로부터 열을흡수하여콜드 2020/175829 1»（：1^1{2020/002075
24 싱크 (22)로전달하게된다.그러면,콜드싱크 (22)에 생성된성에가녹아서 심온실외부로흘러나가고,심온실외부로흘러나가는제상수는냉동증발실로 유입된다.
[268] 냉동증발실로유입되는제상수는,영하온도 (-28ᄋ 0로유지되는냉동증발실의 벽면에서 결빙되거나,냉동실증발기 (17)의 일측표면에결빙되는편착상을 유발할수있다.
[269] 뿐만아니라,심온실제상을위해서 역전압을걸어주면,히트싱크 (24)를따라 흐르는냉매가열을빼앗기면서 액화되어,압축기 입구의석션파이프로액상 냉매가유입되는현상을초래할수있다.
[27이 특히,냉동실온도가만족상태에 있거나,냉동실팬의운전률이낮은조건,즉 실내온도가저온영역에속하는경우에는냉동실증발기를통과하는냉매가 충분히 기화되지못하여,석션파이프쪽으로액냉매가유입되고,결과적으로 압축기의 효율을떨어뜨리는문제를초래할수있다.
[271] 셋째,심온실제상을위해서 열전모듈에 역전압을걸면,콜드싱크 (22)는
영상의온도로상승하는반면,히트싱크 (22)는냉매온도 -28ᄋ (:로유지되기 때문에,흡열면과발열면의온도차 (ᅀ刀가커져서 열전모듈의 냉력 저하를 초래하고,냉력이 저하되면효율 (( 도함께 저하되는문제가발생한다.
[272] 이러한이유때문에 ,냉동실제상과심온실제상은함께수행되도록하는것이 좋다.
[273] 한편,냉동실제상중열전모듈에걸어주는역전압은최대 역전압일수있으나, 이에 제한되는것은아니다.최대 역전압은,열전모듈에걸어주는최대
정전압과절대값이같고방향만다른전압을의미한다.최대 역전압을공급하여 콜드싱크 (22)에착상된성에가단시간에신속하게제거되도록하는것이좋다.
[274] 또한,현재냉동실밸브와냉장실밸브가모두개방된동시운전모드이고, 심온실온도가불만족영역 이상의온도라고판단되면,열전모듈로중전압이 공급되도록할수있다.
[275] 상세히 ,동시운전모드에서는,냉장실냉각과냉동실냉각이 함께수행되고 있기 때문에,열전모듈 (20)로고전압을걸어줄경우,냉동실온도가만족온도 영역으로진입하는데걸리는시간이길어지는문제가발생한다.
[276] 냉각운전을위해서는노치온도어)가높게설정된저장실을우선으로
냉각하는것이,고내온도의급격한상승을막고동시에 음식물의 변질을 최소화하는데유리하다.
[277] 따라서,냉동실과심온실모두냉각이 필요할경우에는냉동실을우선하여
냉각시킨뒤심온실을냉각시키는것이좋다.여기서,심온실냉각을
냉동실만냉각하기보다,심온실과냉동실을함께
Figure imgf000026_0001
수있다.
[278] 따라서,동시운전중에심온실냉각이필요한상황이발생하면,열전모듈로 중전압을공급하여,냉동실팽창변 (15)을통과한냉매의 냉력이심온실과 2020/175829 1»（：1^1{2020/002075
25 냉동실로적절히분배되도록하는것이좋다.
[279] 한편,냉장실밸브만개방되어 ,냉장실증발기쪽으로만냉매가흐르는냉장실 단독운전의경우,열전모듈 (20)의 히트싱크 (24)쪽으로는저온의 냉매가 흐르지 않는다.
[28이 다시 말하면,냉장실단독운전중일때에는열전모듈 (20)의히트싱크 (24)가 방열수단으로서기능을못한다고볼수있다.이 경우에는,상술한바와같이 , 열전모듈 (20)이 열부하를심온실로전달하는열전도체로기능하는것을 방지하는것이바람직하다.
[281] 따라서,현재냉장실단독운전모드이고,냉동실제상운전모드가아닐경우, 최소한의 전압을공급하는것이바람직하다.즉,열전모듈 (20)로저전압을 공급하여,히트싱크 (24)로전달되는열을최소화하는것이좋다.
[282] 이하에서는냉동실밸브만개방되어 ,냉매가냉동실증발기쪽으로흐르는
경우열전소자 (21)의출력 제어에 대하여 설명한다.
[283] 먼저,상기 열전모듈 (20)의 히트싱크 (24)와냉동실증발기 (17)가직렬
연결되는냉매순환시스템에서는,냉동실냉각또는심온실냉각을위하여 냉동실밸브가개방되면냉매가상기 히트싱크 (24)와냉동실증발기 (17)를따라 흐르게된다.이경우,압축기는최대출력으로운전하게된다.
[284] 먼저,냉동실온도가도 7의 (비에보이는상한온도영역 (0에 있는경우,
냉동실을신속히우선냉각하는것이중요하다.따라서,냉동실온도가상한 온도영역에 있는경우에는열전소자 (21)에 저전압을걸어주어,냉동실 증발기 (17)로유입되는냉매의 냉력이부족하여 냉동실냉각시간이 길어지지 않도록한다.
[285] 만일,상기 냉동실온도가도 7의 에보이는불만족온도영역 (피에 있는
경우에는상기 열전소자 (21)에중전압을걸어주어,심온실과냉동실의 냉각 속도가비슷하게유지되도록할수있다.다시 말하면,두저장실의 냉각완료 시점 간의시간차가적어지도록하여 ,압축기구동시간을단축시켜 냉매순환 시스템의 효율을극대화할수있다.
[286] 상기 냉동실온도가도 7의 ( 에보이는만족온도영역 (서에 있는경우에는, 상기 열전소자 (21)에고전압을걸어주어,심온실온도가만족온도영역으로 신속하게진입하도록한다.상기 냉동실이만족온도영역에 있으면,냉동실 팽창변을통과하는냉매의 냉력을최대한심온실냉각에사용될수있기 때문에, 열전소자 (21)에고전압을걸어주는것이좋다.
[287] 이때 ,현재실내온도가어느온도영역에 있는지에따라서 열전소자에 걸리는 전압을다르게설정할수있다.일례로,실내온도가고온영역에속한다고 판단되는경우,제 1고전압이 열전소자에걸리도록할수있고,실내온도가 고온영역에속하지 아니한다고판단되는경우에는제 1고전압보다낮은제 2 고전압이 열전소자에 걸리도록할수있다.상기 제 1고전압과제 2고전압은 각각고전압범위의상한임계치와하한임계치일수있으나,이에 제한되는 2020/175829 1»（：1^1{2020/002075
26 것은아니다.
[288] 또한,냉동실냉각운전이수행되는동안,열전소자 (21)에걸리는전압이
일정하게유지되도록제어할수도있지만,냉동실온도가낮아질수록열전 소자 (21)에걸리는전압이증가하도록제어될수도있을것이다.
[289] 일례로,상기표 2에보이는바와같이 ,냉동실온도가상한온도영역에서 불만족온도영역으로진입할때,상기 열전소자에 걸리는전압값도변하도록 설계될수있다.
[29이 다른예로서 ,냉동실온도가감소하지만온도영역이 바뀌지 않는경우라
하더라도냉동실온도감소에반비례하여 열전소자에 걸리는전압이 증가하도록설계될수있다.구체적으로,냉동실온도가상한온도또는불만족 온도영역중어느하나의 영역에서설정온도만큼떨어지면,열전소자에 걸리는전압이설정 값만큼증가하도록할수도있을것이다.
[291] 한편,심온실온도가불만족온도이상이고,상태가
Figure imgf000028_0001
중일경우에는,펌프다운직전에 열전소자 (21)에 공급된전압이 걸리도록할수 있다.
[292] 펌프다운운전은,냉장고의 저장실들이모두만족온도영역에 진입한경우, 냉매순환시스템의운전을정지하기 전에,증발기들에모여 있는냉매를 응죽기로집중시켜,다음운전때냉매부족현상이 발생하지 않도록하는운전 모드이다.
[293] 펌프다운운전에진입하면,먼저 절환실밸브 (13)를닫아서 냉매가증발기로 유입되지못하도록한다.그다음,압축기를구동시켜서증발기에모여 있는 냉매를모두흡입 및압축하여응축기로공급한다.
[294] 일반적으로,펌프다운운전시작전에는심온실온도가만족온도영역에 있을 가능성이높다.따라서,펌프다운운전시에는열전소자에 저전압이걸리는 경우가많으나,심온실에부하가투입되어심온실부하대응운전이수행된후 펌프다운운전이수행되는경우에는고전압이걸릴수도있다.
[295] 다른방법으로서 ,펌프다운과정에서 냉매가증발실을빠져나가는동안, 증발실을빠져나가는냉매의 냉력을최대한심온실냉각에 활용하기위하여 , 열전소자에최대 전압이걸리도록할수도있다.
[296] 상세히 ,심온실의온도는극저온상태이므로,과냉 현상으로인한문제가
발생할여지가매우낮다.따라서,냉매의 냉력을최대한사용하여심온실을 냉각시키면,펌프다운이종료되고,다음사이클이시작될때까지의주기가 길어지므로,소비 전력절감효과를얻을수있다.
[297] 이하에서는,열전소자의출력제어를위한전압범위를설정하는방법에
대하여 설명한다.
[298] 상술한바와같이,고내상황에 따라열전소자에걸리는전압이다르게
설정되고,설정된전압은고전압,중전압,저전압으로구분될수있다.
[299] 도 8은저전압과고전압범위를결정하는기준을설명하기 위해제시되는 전압과열전소자의냉력과의상관관계를보여주는그래프이다.
[300] 도 8을참조하면,열전소자의출력제어를위한저전압상한값을결정하는
방법중의일례로서,심온케이스 (201)의단열부하에대응하는냉력을내기 위해서요구되는전압을저전압상한값으로결정할수있다.
[301] 여기서,심온케이스 (201)의단열부하 (Watt)는,심온케이스의단열능력에
의하여정해지는값으로서,냉동실과심온실의온도차로인하여냉동실로부터 심온실로침투하는열부하량으로정의될수있다.상기단열부하의단위는 냉력과동일하다.
[302] 상세히,심온실의단열부하는심온실의내부와외부를단열벽으로구획한
상태에서,심온실내부에별도의열부하가투입되지않는경우에도,심온실 내부와외부의온도차에의하여발생하는열손실량또는심온실내부로 침투하는열부하량으로정의될수있다.심온실의단열부하 (Q i)에대한식은 아래와같다.
[303] QrUA( Th- Tf)
[304] U :종괄열전달계수 (over-all coefficient of heat transfer)
[305] A :열전달면적
[306] T h :심온실외부온도
[307] T 1 :심온실내부온도
[308]
[309] 또한,상기열전모듈의냉력 (Q c)그래프는전압의 2차함수 (또는전류의 2차 함수)로정의되므로,도 8에보이는바와같이 ,단열부하 (Q i)가산출되면,산출된 단열부하 (Q i)에대응하는냉력을내는데필요한전압,소위“최소단열부하 전압 (V J”과“최대단열부하전압 (V al)”이정해진다.
[310] 따라서,상기최소단열부하전압이상이고,최대단열부하전압이하의
전압이상기열전모듈에인가되면,열전모듈의냉력이심온실의단열부하를 제거할수있기때문에,심온실의온도를낮출수있다.
[311] 반면,상기최소단열부하전압보다낮은전압또는상기최대단열부하
전압보다높은전압이상기열전모듈에인가되면,열전모듈의냉력이심온실의 단열부하를완전히제거하지못하기때문에,심온실의온도가급격하게 상승하는것을방지할수는있으나,심온실온도를낮출수는없다.
[312] 따라서 ,상기열전소자에걸리는저전압 (V L)은, 0<V L<V ,를만족하는
전압값으로결정될수있다.
[313] 일례로,도 8의그래프에보이는바와같이, AT가 30OC인열전소자를사용하고, 단열부하가 20W미만이라고가정하면,열전소자에걸리는저전압 (\ )은 10V 미만인값으로결정될수있다.
[314] 한편,열전소자에걸리는고전압의상한을결정하기위해서는도면에 2020/175829 1»（：1^1{2020/002075
28 汉0 ）이 0이되는전압값（V 이하“냉력임계전압”）이고전압의상한값으로
（次，
결정될수있다.
[315] 상세히,냉력그래프를참조하면,열전소자에인가되는전압값이증가할수록, 즉열전소자에걸리는전압차가커질수록,열전소자의냉력이증가한다.
[316] 그러나,열전소자에걸리는전압이냉력임계전압을초과하면,냉력은오히려 감소하는특성을보인다.
[317] 따라서,냉력이최대가되고냉력변화율이 0이되는임계점에서의전압값（\\
）을고전압（V !!）의상한값으로결정할수있다.
[318] 일례로, 가 30ᄋ（:인열전소자를사용하는경우를가정하면,열전소자에
걸리는고전압（\ ）은약 35¥로결정될수있다.
[319] 도 9는고전압범위및중전압의범위를결정하는기준을설명하기위해
제시되는전압대비열전소자의냉력및효율과의상관관계를보여주는 그래프이다.
[32이 도 8에서저전압（\\）과고전압（\ ）의범위를결정하는기준을설명하였다. 상기고전압（\ ）는경우에따라제 1고전압（V비）과상기제 1고전압 ᅦ ）보다는낮은전압인제 2고전압 «2）,및후술할중전압 와같이 2개이상의 범위로구분하여사용할수도있음을밝혀둔다.
[321] 도 9를참조하면,열전소자에걸리는고전압범위를결정하기위해서,도 8에서 설명된바와동일하게,스!가 30ᄋ（:인열전소자를사용하는경우를일례로들어 설명하도록한다.
[322] 도면상에서,그래프（31은열전소자의효율그래프이고, 02는냉력
그래프이다.상기냉력그래프 02는,도 8의그래프중전압이 30\미만인 구간에서의냉력그래프이다.
[323] 도 8에서설명된바와같이,냉력변화율이 0이되는지점에서의전압값（\\）을 열전소자에인가되는고전압으로결정하는것을가정한다.
[324] 그러면,상기고전압이열전소자에인가되었을때,열전소자의냉력은최대가 되기때문에유리할수있으나,열전소자의효율（（:。!5）은감소하는구간이므로 열전소자의효율측면에서는불리하다고할수있다.
[325] 따라서,열전소자에걸리는고전압의상한을결정하기위해서는,전압-효율 그래프에서,전압변화에따른열전모듈의효율변화율
Figure imgf000030_0001
전압값（이하“효율임계전압” XV。）을더고려할필요가있다.
[326] 상세히,상기열전모듈에인가되는전압이상기효율임계전압에도달할
때까지는열전소자의효율뿐만아니라냉력도함께증가하는것을확인할수 있다.그러나,상기열전모듈에인가되는전압이상기효율임계전압을 초과하면냉력은증가하지만,효율을감소하는것을알수있다. 2020/175829 1»（：1^1{2020/002075
29
[327] 따라서,열전소자에걸리는고전압은효율임계전압으로결정될수있다.
[328] 여기서 ,효율임계전압을초과하는경우,열전소자의효율은감소하지만
냉력은계속해서증가하기때문에,심온실의전체적인상황을고려할때,효율 손실을감수하고냉력값을취하는것이유리할수도있다.
[329] 따라서,열전소자의고전압（\ ）은아래의범위내의전압으로결정될수있다.
[330] （ £- 1）< 표<（ + 2）
Figure imgf000031_0001
[333] 상기 \¥1은 0.8일수있고,상기 \¥2는 1.2일수있으나이에제한되지않는다.
[334] 상기효율임계전압（V。）이 14¥라고가정하면,열전모듈의고전압（\ ）범위는 11. IV이상 16 이하로설정될수있고,바람직하게는 11¥이상 \1\이하로 설정될수있다.
[335] 또한,상기고전압（\ ）의범위가결정되면,중전압（\%0의범위도아래와같이 결정될수있을것이다.
[336] VL < VM< i Vc-w l）
[337]
[338] 도 은열전소자의고전압상한값을설정하는기준을설명하기위해
제시되는전압대비심온실온도변화관계를보여주는그래프이다.
[339] 도 을참조하면,열전소자에인가되는고전압（V ^의상한값을결정하기
위해서,다음과같은기준을적용할수있다.
[34이 상세히,열전소자에인가되는고전압의상한값은,심온실온도변화량또는 온도변화율（ 淑 ）이설정값 1）이하또는미만이되는시점에서의온도임계
£ ，
전압 ᄆ）으로정의될수있다.여기서, 1：는온도변화량,（IV는전압변화량을 의미한다.
[341] 상기설정값（ ）은열전소자의규격과심온케이스（201）의단열부하등에
따라다르게설정될수있을것이다.
[342] 일례로서온도변화량이 0.1°0미만이되는전압을고전압의상한값으로
정한다고가정하면,도 의그래프에서온도변화량이 0.1ᄋ（:미만이되는 시점에서의공급전압은대략 16\ ]을확인할수있다.
[343] 지금까지의내용을정리하면,열전소자에인가되는전압의범위는아래표 3 같이정의될수있다.
[344] [표 3]
Figure imgf000031_0002
[345] 표 2에서보이는열전소자의출력제어를위해설정되는저전압은 중전압은 12V,제 1고전압은 16V,및제 2고전압은 14V일수있으나,이에 제한되지않으며 ,적용되는열전소자의규격 (specification)에따라달라질수 있다.이는,열전소자의규격에따라공급전압에따른열전소자의냉력과 효율이다르기때문에,각구간별임계전압도다르게설정되어야하는것은 자명하다할것이다.한편,아래표 4는표 2에서보이는열전소자의출력에 대응하는심온실팬의구동속도를보여준다.
[346] 도 11은심온실모드가온일때냉장고의운전모드에따른심온실팬의구동 제어방법을보여주는플로차트이다.
[347] 이하에서는,표 4와도 11을참조하여 ,냉장고운전상태에따라열전소자에 걸리는전압및심온실팬의구동속도제어방법에대하여설명하도록한다.
[348] [표 4]
Figure imgf000032_0001
[349] 심온실모드가온상태라함은,사용자가심온실모드실행버튼을눌러심온실 모드가수행가능한상태에있다는것을의미한다.따라서,심온실모드가온된 상태에서는,특정조건이만족되면열전모듈로전원이즉시인가될수있다.
[35이 반대로심온실모드가오프상태라함은,열전모듈로의전원공급이차단되어 있는상태를의미한다.따라서，예외적인경우를제외하고는열전모듈과심온실 팬으로의전원공급이이루어지지않는다.
[351] 한편,상기도 8내지도 을통해설명된제어방법은,상기심온실외에도 저장실쇼의열전모듈에인가되는전압을제어하는방법에도적용될수있다.
[352] 도 11을참조하면,심온실모드가온상태이면 110),제어부에서는현재운전 모드가심온실이미운전상태인지여부를판단한다 (別20). 2020/175829 1»（：1^1{2020/002075
31
[353] 심온실이미운전상태인지여부를판단한다는것은,현재냉장고운전조건이 냉장실단독운전상태인지또는현재심온실온도가만족상태인지여부를 판단하는것으로설명될수있다.
[354] 여기서심온실이만족상태라함은,심온실의온도가도 7의切에보이는
심온실만족온도영역 (쇼)에 있는것을의미한다.
[355] 냉장실단독운전이라함은,냉장실냉각을위하여상기절환밸브 (13)가
냉장실팽창변 (14)쪽으로절환되어,냉매가냉장실팽창변 (14)쪽으로만흐르는 상황을의미한다.
[356] 냉장실단독운전중이거나심온실온도가만족상태이면심온실팬을
정지하거나정지상태를유지한다 ( 30).
[357] 냉장실단독운전중인경우,냉동실팽창변 (15)쪽으로는냉매가흐르지않기 때문에 ,히트싱크 (24)로도냉매가흐르지않는다는것을의미한다.따라서 ,이 상태에서는열전모듈이냉각부재의기능을수행하지못하는상태이기때문에, 심온실팬 (25)은구동하지않도록제어된다.
[358] 이상태에서는,표 2에보이는바와같이냉장실단독운전중이고냉동실제상 운전이아니라면열전소자에는저전압이걸리도록한다.
[359] 현재심온실온도가만족온도상태라고하면굳이심온실팬을구동할필요가 없으므로,심온실팬 (25)이구동하지않도록제어되는것은당연하다고할 것이다.따라서 ,표 3에보이는바와같이 ,심온실온도가만족온도상태이면, 심온실팬은정지또는정지상태를유지하도록제어된다.
[36이 제어부에서는심온실팬의정지시간이설정시간 0이상지속되고있는지 여부를판단한다 140).여기서설정시간 은 60분일수있으나,이에제한되는 것은아니다.
[361] 심온실내부의극저온상태에서심온실팬이장시간정지상태를유지하게
되면,심온실팬과회전축이결빙되어전원이인가되어도회전하지못하는 현상이발생할수있다.따라서,설정시간 0이상심온실팬의정지상태가 유지되는경우,제어부에서는심온실팬이저속으로구동하도록한다 150).
[362] 제어부에서는설정시간 2)이경과하면심온실팬을정지시키고 160),냉장고 전원이오프되었는지여부를판단하여 (別70),심온실팬구동알고리즘을 종료하거나,계속하여반복수행하도록한다.
[363] 여기서심온실팬이저속으로구동하는상기설정시간 2)은 10초일수있으나, 이에제한되는것은아니다.
[364] 한편,냉장실단독운전중인지여부를판단하는단계 120)에서,냉장실단독 운전이아니고심온실온도도만족상태가아니라고판단되면,냉동실도어가 개방된상태인지여부를판단하는과정이수행된다 (別80).
[365] 여기서,냉장실단독운전이아니라는것은,냉동실단독운전또는냉장실과 냉동실을동시에냉각시키는동시운전중어느하나의상태임을의미한다고할 수있다. 2020/175829 1»（：1^1{2020/002075
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[366] 상기냉동실도어가개방된상태인것으로판단되면상기심온실팬은
정지하거나정지상태를유지하는단계 130）로넘어가도록한다.
[367] 냉동실도어가개방된상태에서는냉동실내부또는심온실드로어를개방하여 음식물을투입하거나음식물을꺼내는상황이발생할수있기때문에,외부 공기가냉동실또는심온실로침투할가능성이높다고할수있다.따라서, 냉동실도어가개방된상태라고판단되면심온실팬이구동하지않도록 제어된다.
[368] 또한,냉동실도어가닫힌상태라고판단되면,상기제어부에서는냉동실운전 시작후설정시간 3）이경과하였는지여부를판단한다 190）.
[369] 만일,현재시점이냉동실운전시작후설정시간이경과하지않은상태라고 판단되면상기심온실팬이정지하거나정지상태를유지하는단계 130）로 넘어간다.
[37이 즉,현재심온실모드가온상태라고판단된경우,제어부는현재운전조건이 앞서설명한단계別20,단계別80,단계別90의조건중적어도하나가만족되면, 단계 30로넘어가도록냉장고를제어하는것으로요약할수있다.이는곧, 단계 8120,단계 8180,단계別90의조건이모두만족되는경우를포함하는 것으로해석되어야함은당연하다.
[371] 또한,상기단계 80과 90의과정은순차적으로수행하되수행순서에는 제한이없음을밝혀둔다.
[372] 냉동실운전초기에는냉동실온도를설정수준으로낮추는것이중요하기
때문에,일정시간동안은냉동실팽창변（15）을통과한냉매가냉동실냉기와 집중적으로열교환하도록제어된다.
[373] 상기설정시간 3）은 90초일수있으나이에제한되는것은아니다.
[374] 또한,냉동실운전시작후설정시간 3）이경과하였다고판단되면,상기
제어부에서는현재냉동실온도가만족온도인지여부를판단한다 200）.
[375] 즉,현재심온실모드가온상태라고판단된경우,제어부는현재운전조건이 앞서설명한단계 8120,단계 8180,단계別90의조건을모두만족하지않으면, 단계 3200으로넘어가도록하는것으로요약될수있다.
[376] 냉동실온도가만족온도가아니라고판단되면심온실팬을저속
구동하여 220）,냉동실온도가신속히도 7의切에서보이는만족영역（서까지 냉각되도록한다.
[377] 즉,표 2에서냉동실온도가상한온도영역및불만족온도영역중어느하나에 속하는경우에는심온실팬을저속으로구동하도록한다.그러나,이에제한되지 않고,냉동실온도가불만족온도영역에 있는경우에는심온실팬이중속으로 구동하도록제어되는것도가능함을밝혀둔다.
[378] 반면,냉동실온도가현재만족영역에있다고판단되면심온실팬을중속으로 구동하여 210）,심온실이설정온도까지냉각되도록한다.
[379] 냉동실온도가만족온도인경우,냉동실팬이구동하지않아서냉동실 2020/175829 1»（：1^1{2020/002075
33 증발기 (17)에서는실질적으로열교환이일어나지않을수있다.따라서,상기 히트싱크 (24)를통과하는냉매가상기심온실냉기와열교환하여심온실온도가 설정온도로신속히냉각되도록심온실팬의회전속도를높이는것이좋다.
[380] 한편,심온실팬이저속또는중속으로구동하고있는중에는심온실온도가 만족영역으로진입하였는지가지속적으로판단된다.즉,심온모듈의전면에 장착되어심온실냉기에노출된심온실온도센서 (미도시)에서는지속적으로 심온실온도를감지하고,감지결과를제어부로전송한다.
[381] 상기제어부에서는전송된심온실온도감지값을기반으로심온실온도가만족 영역 (서으로진입하였는지여부를판단하게된다 230).
[382] 심온실온도가만족상태가아니라고판단되면,냉동실도어가개방되었는지 여부를판단하는단계 (別80)로되돌아가서이후과정을반복수행한다.
[383] 그러나본발명은단계別80으로되돌아가는것에제한되지않고,단계 8120, 8190,및 8200중어느하나로되돌아가도록제어되는것도가능함을밝혀둔다.
[384] 여기서,심온실팬이저속또는중속으로구동하고있는도중에사용자가
냉동실도어를개방하는상황이발생할수있고,이경우에는심온실팬을즉시 중지시킬필요가있다.따라서,심온실팬이구동하고있고,심온실온도가만족 영역에 있지않은경우에는제어부에서지속적또는주기적으로냉동실도어의 개방여부를감지할필요가있다.
[385] 심온실온도가만족영역으로하강하였다고판단되면,상기심온실팬은
저속으로구동하도록제어된다 240).
[386] 만일심온실온도가불만족상태에서도저속으로구동하고있었으면,저속 운전을계속유지하고,중속이상으로구동하고있었으면저속으로속도 가변되도록한다.
[387] 심온실온도가만족영역에 있는상태에서심온실팬의저속구동시간이설정 시간 4)을경과하였다고판단되면 250),심온실팬을정지하는단계 (別30)로 넘어가도록제어된다.심온실팬의정지시간이설정시간 ( )을초과하였는지 여부를판단하는단계가반복수행되도록한다.상기설정시간 4)은 90초일수 있으나이에제한되는것은아니다.
[388] 여기서,심온실온도가만족영역내로들어온이후에도설정시간 4)동안 심온실팬을더구동시키는이유는다음과같다.상세히 ,심온실냉각운전이 종료하여열전소자 (21)로공급되는전원이차단되더라도,상기모듈 (20)의콜드 싱크 (22)는심온실온도이하의상태를일정시간유지하기때문에,콜드 싱크 (22)에남아있는냉기를최대한심온실냉기로공급하기위함이라고할수 있다.
[389] 다시말하면,열전소자로전원공급이차단된이후에도,콜드싱크 (22)의
온도가심온실온도미만인상태를유지하는동안은,심온실냉기와콜드 싱크 (22)가열교환하도록하여,콜드싱크 (22)가심온실냉기로부터열을더 흡수하도록하기위함이다. 2020/175829 1»（：1^1{2020/002075
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[39이 이와같이,콜드싱크 (22)에남은잔냉기를최대한활용하면열전모듈의
냉력과효율이증가하는효과를얻을수있다.
[391] 그러나,심온실온도가만족온도영역에진입하면심온실팬을추가구동하는 단계 8240및 3250을수행하지 않고바로심온실팬을정지하는단계 30으로 넘어가도록하는것도가능하다.
[392] 다른예로서 ,현재심온실모드가온상태라고판단된경우,제어부는현재운전 조건이 앞서설명한단계 8120,단계 8180,단계別90의조건을모두만족하지 않으면,냉동실온도만족여부를별도로판단하지 않고무조건심온실팬을 특정속도로구동하도록하는제어도가능하다.여기서특정속도는저속과중속 외에다른속도도포함할수있음을밝혀둔다.
[393] 다른실시예로서,단계 8120, 8180,및別90중적어도어느하나만만족하지 않아도바로단계 3200으로넘어가도록하거나,바로심온실팬을상기특정 속도로회전하도록하는단계로넘어가도록하는것도가능하다.

Claims

2020/175829 1»（：1^1{2020/002075 35 청구범위
[청구항 1] 냉장실;
상기 냉장실과구획되는냉동실;
상기 냉동실내부에수용되고,상기 냉동실과구획되는심온실;
상기심온실의온도를냉동실온도보다낮은온도로냉각하도록 제공되는열전모듈;
상기심온실내부의온도를감지하는온도센서;
상기심온실내부공기를강제유동시키는심온실팬;및
상기 열전모듈및상기심온실팬의구동을제어하는제어부를포함하는 냉장고의 제어방법에 있어서,
심온실모드가온상태이면,상기 냉장고의운전모드에 따라상기 열전 모듈에 저전압,중전압,고전압및 역전압중어느하나가걸리도록 제어되고,
상기심온실의온도가만족온도영역에 있다고판단되면, 상기 제어부는,상기 열전모듈에 저전압이 걸리도록하는것을특징으로 하는냉장고의제어 방법.
[청구항 2] 제 1항에 있어서,
상기심온실온도가만족온도영역에진입하면,상기심온실팬은설정 시간동안저속구동한후정지하도록제어되는것을특징으로하는 냉장고의 제어방법.
[청구항 3] 제 1항에 있어서,
냉동실제상운전이시작되면,상기 열전모듈에 역전압이 걸리도록하여 , 냉동실제상운전과심온실제상운전이함께수행되도록하는것을 특징으로하는냉장고의 제어방법 .
[청구항 4] 제 1항에 있어서,
현재 냉장고가동시운전모드에 있다고판단되면,
상기심온실온도에 따라상기 열전모듈에 걸리는전압이다르게 설정되는것을특징으로하는냉장고의 제어방법.
[청구항 5] 제 4항에 있어서,
상기심온실온도가만족온도영역내에 있다고판단되면,상기 열전 모듈에 저전압이걸리도록하고,
상기심온실온도가만족온도영역밖에 있다고판단되면,상기 열전 모듈에중전압걸리도록하는것을특징으로하는냉장고의제어 방법.
[청구항 6] 제 1항에 있어서,
현재 냉장고가냉장실단독운전모드에 있다고판단되면,상기 열전 모듈에 저전압이걸리도록하는것을특징으로하는냉장고의제어 방법.
[청구항 7] 제 6항에 있어서, 2020/175829 1»（：1^1{2020/002075
36 상기냉장실단독운전모드에서상기심온실팬은정지또는정지상태를 유지하도록제어되는것을특징으로하는냉장고의제어방법 .
[청구항 8] 제 1항에있어서,
현재냉장고가냉동실단독운전모드에있고,상기심온실온도가불만족 온도영역이상의온도라고판단되면,
상기냉동실의온도와실내온도중적어도어느하나에따라상기열전 모듈에걸리는전압이다르게설정되는것을특징으로하는냉장고의 제어방법.
[청구항 9] 제 8항에있어서,
상기냉동실단독운전모드에서,냉동실온도가상한온도영역에있다고 판단되면,상기열전소자에저전압이걸리도록하는것을특징으로하는 냉장고의제어방법.
[청구항 10] 제 9항에있어서 ,
상기냉동실의온도가불만족온도영역에있다고판단되면,상기열전 소자에중전압이걸리도록하는것을특징으로하는냉장고의제어방법.
[청구항 11] 제 10항에있어서 ,
상기냉동실의온도가상한온도또는불만족온도영역에있다고 판단되면,상기심온실팬은저속으로구동하도록제어되는것을 특징으로하는냉장고의제어방법 .
[청구항 12] 제 9항에있어서 ,
상기냉동실의온도가만족온도영역에있다고판단되면,상기열전 소자에고전압이걸리도록하는것을특징으로하는냉장고의제어방법.
[청구항 13] 제 12항에있어서 ,
상기냉동실의온도가만족온도영역에있다고판단되면,상기심온실 팬은중속으로구동하도록제어되는것을특징으로하는냉장고의제어 방법.
[청구항 14] 냉장실;
상기냉장실과구획되는냉동실;
상기냉동실내부에수용되고,상기냉동실과구획되는심온실;
상기심온실내부의온도를감지하는온도센서;
상기심온실내부공기를강제유동시키는심온실팬;
상기심온실을향하는흡열면과,상기흡열면의반대면으로정의되는 발열면을포함하는열전소자와,상기흡열면에접촉하며,상기심온실 일측에놓이는콜드싱크와,상기발열면에접촉하는히트싱크를 포함하며심온실의온도를냉동실온도보다낮은온도로냉각하도록 제공되는열전모듈;및
심온실냉각을위한심온실냉각운전과,상기열전모듈에생성된성에나 얼음을제거하기위한심온실제상운전이충돌하면,심온실제상운전을 2020/175829 1»（：1^1{2020/002075
37 우선하여수행하고심온실냉각운전은중단하도록제어하는제어부를 포함하는냉장고의제어방법에있어서,
심온실모드가오프상태에서,상기심온실의온도가상기냉동실을위한 제 2노치온도어2）를기준으로구분되는불만온도영역에있는경우,상기 심온실의온도가하강하도록상기심온실팬이구동하도록제어되고, 상기심온실의온도가상기제 2노치온도를기준으로구분되는만족온도 영역에진입하면,상기심온실팬이정지하도록제어되며 , 심온실모드가온상태에서,상기심온실의온도가상기
제 2노치온도어2）보다낮은제 3노치온도어3）를기준으로구분되는 불만족온도영역에있는경우와,냉동실의온도가상기제 2노치온도를 기준으로구분되는만족온도영역에있는경우중적어도하나를만족할 때,상기심온실의온도가하강하도록상기열전모듈에정전압 V ^（: >0）가 인가되도록제어되는것을특징으로하는냉장고의제어방법 .
[청구항 15] 제 14항에있어서 ,
심온실모드가온상태에서,상기심온실의온도가상기제 3노치온도를 기준으로구분되는만족온도영역에있는경우,
상기심온실의온도상승이지연되도록,상기열전모듈에정전압 （0<¥ V 이인가되도록제어되는것을특징으로하는냉장고의제어 방법.
[청구항 16] 제 14항에있어서 ,
상기심온실제상운전의투입을위한조건이만족되면,상기열전모듈에 인가되는정전압이차단되고,
상기심온실팬의구동이정지된상태에서상기열전모듈에역전압（- ）이인가되도록제어되는것을특징으로하는냉장고의제어방법 .
[청구항 17] 제 15항에있어서 ,
상기심온실의단열부하에대응하는냉력이하의냉력이상기열전 모듈로부터상기심온실로공급되도록하여,상기열전모듈에인가되는 소비전력이저감되도록,상기정전압 0은최소단열부하전압 ,） 이하의전압값을포함하고,
상기심온실의단열부하에대응하는냉력보다큰냉력이상기열전 모듈로부터상기심온실로공급되도록,상기정전압（\ ）은,상기 정전압（V 0보다크고최대단열부하전압 보다작은범위의 전압값을포함하는냉장고의제어방법 .
[청구항 18] 제 15항에있어서 ,
상기정전압（\ ）은,상기열전모듈로잉여전압이투입되지않도록,전압 변화에따른열전모듈의냉력변화율（ ᄃ）이 0이되는냉력임계 넜1， 2020/175829 1»（：1^1{2020/002075
38 전압（\¾）이하의전압값을포함하는냉장고의제어방법 .
[청구항 19] 제 15항에있어서 ,
상기정전압（V ^은,상기열전소자의효율및냉력을향상시킬수 있도록,전압변화에따른열전모듈의효율변화율
Figure imgf000040_0001
되는효율임계전압（V。）범위의전압값을포함하는냉장고의제어방법. [청구항 20] 제 15항에있어서 ,
상기정전압（\ ）은,심온실내부온도변화에더이상영향을주지않는 불필요한전압이인가되지않도록,심온실온도변화변화율（ 淑 ）이
£， 설정값이하또는미만이되는온도임계전압 ᄆ）이하의전압값을 포함하는냉장고의제어방법.
PCT/KR2020/002075 2019-02-28 2020-02-13 냉장고의 제어 방법 WO2020175829A1 (ko)

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