KR20080003137A - Refrigerator - Google Patents

Abstract

A refrigerator is provided to prevent release of supercooled state of the liquid by confining movement of the supercooled liquid and revert to the supercooling state for liquid if the supercooling state is released. A refrigerator(500) comprises a storage chamber(510), a door(520), a water tank(560), a sensor(580), a heater(560a), an energy generator(570), a case, and a confining member. The storage chamber supplies chilled air. The door opens and closes the storage chamber. The water tank is disposed on the door side, accommodating supercooled liquid. The sensor senses phase change of the supercooled liquid. The heater, interlocked with the sensor, supplies heat to the tank. Thus the release of supercooling state can be sensed by the sensor, and recovered by the heater. The energy generator, such as an electrode, provides energy to the supercooled liquid to keep its state supercooled. The case, which is mounted on the door and receives the tank, comprises at least one of the heater, sensor, or the electrode which provides energy to the supercooled liquid. The confining member provided on the tank, confines movement of the supercooled liquid, so as to prevent release of supercooling state due to external impact or opening and closing of the door.

Description

Refrigerator {REFRIGERATOR}

1 is a view showing a refrigerator equipped with a dispenser disclosed in Korean Laid-Open Patent Publication No. 2001-0107286;

2 is a view showing a refrigerator equipped with a dispenser disclosed in Korean Laid-Open Patent Publication No. 2003-0050929,

3 is a view showing another example of a refrigerator equipped with a conventional dispenser,

4 and 5 are views showing a refrigerator dispenser disclosed in Korean Laid-Open Patent Publication No. 2005-0051977,

6 and 7 illustrate a refrigerator dispenser disclosed in Korean Laid-Open Patent Publication No. 2005-0051972;

8 conceptually illustrates a supercooled liquid or slush preparation according to the present invention;

9 is a view showing one of the experimental results according to the present invention,

10 is a view showing an example of a refrigerator according to the present invention;

11 is a view showing another example of a refrigerator according to the present invention;

12 is a view showing another example of a refrigerator according to the present invention;

13 is a view showing another example of a refrigerator according to the present invention;

14 is a block diagram illustrating a method of operating a supercooled liquid or slush manufacturing apparatus according to the present invention;

15 to 17 show examples of the configuration of a region to which an electric field is applied;

18 is a view showing an example of a refrigerator provided with a supercooling release means according to the present invention;

19 is a block diagram for explaining a method of operating a refrigerator equipped with a supercooling release means according to the present invention;

20 is a view showing another example of a refrigerator provided with a supercooling release means according to the present invention;

21 to 23 show examples of limiting members according to the present invention;

24 shows another example of experimental results performed in accordance with the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator, and more particularly, to a refrigerator capable of preventing subcooling of a subcooled liquid and recovering it when the subcooling is released.

Here, subcooling means that a liquid such as water does not transition even below a phase transition temperature to a solid and maintains a high temperature phase, that is, a liquid state. In the natural state, for example, the supercooling water drop (supercooling water drop) is an example, even in the conventional refrigerator, the water or the drink may not be frozen by chance to the supercooled state. Meanwhile, as the principle of subcooling is applied to a refrigerator, there are a freezing method disclosed in Japanese Patent Laid-Open Publication No. S59-151834 and a freezing method disclosed in Japanese Patent Laid-Open Publication No. 2001-086967 and a refrigerator. A technique of applying a magnetic field to maintain a food in a supercooled state below a phase transition temperature is disclosed. In addition, the electrostatic field treatment method disclosed in WO / 98/41115 discloses various types of electrode structures that can be used for supercooling and thawing food.

1 is a view showing a refrigerator equipped with a dispenser disclosed in Korean Laid-Open Patent Publication No. 2001-0107286, wherein the refrigerator 100 includes a dispenser 120 in a freezer compartment door 110, and the dispenser 120 has an outlet portion. An operating lever 140 and a pedestal 150 are provided at 130.

2 is a view showing a refrigerator equipped with a dispenser disclosed in Korean Laid-Open Patent Publication No. 2003-0050929, wherein the refrigerator 200 includes a dispenser 220 in a refrigerating compartment door 210.

3 is a view illustrating another example of a refrigerator equipped with a conventional dispenser, and the refrigerator 300 includes a freezing compartment 310 and a refrigerating compartment 320. An ice maker 330 is provided in the freezer compartment 310, and a dispenser 350 is provided in the freezer compartment door 340. A flow path 360 for supplying water to the ice maker 330 and the dispenser 350 is formed, the flow path 360 is connected to an external water supply source (not shown), and the flow path 360 has a first valve 370. ), The filter 380 and the second valve 390 are located. The first valve 370 controls the water supply from the external water supply to the refrigerator 300, the filter 380 filters the water, and the second valve 390 water to the ice maker 330 and the dispenser 350. To control the supply. Meanwhile, the first valve 370 and the second valve 390 are controlled by a control unit (not shown) of the refrigerator 300. The flow path 360 includes a flow path 361 for supplying water to the dispenser 350, and the water in the flow path 361 cools through heat exchange with the freezer compartment 310, so that the outlet 362 of the flow path 361 or It flows out through the outlet part 351 of the dispenser 350.

4 and 5 are views showing the refrigerator dispenser disclosed in Korean Laid-Open Patent Publication No. 2005-0051977, the dispenser 400 is installed in the freezer compartment door 420 filled with the heat insulator 410, the bucket 430 Equipped. The water bottle 430 heat-exchanges with the freezer compartment side 440 to make cool water. Between the bucket 430 and the freezer compartment side 440 is filled with a heat insulating material 410 to enable heat exchange. Meanwhile, the dispenser 400 includes a heater 450 on the opposite side of the freezer compartment 440 based on the bucket 430, and the heater 450 is used to control the temperature of the water in the bucket 430.

6 and 7 illustrate a refrigerator dispenser disclosed in Korean Laid-Open Patent Publication No. 2005-0051972. The dispenser 600 is installed in a freezer compartment door 620 filled with a heat insulator 610. Equipped. The water tank 630 exchanges heat with the freezer compartment side 640 to make cool water. In addition, the dispenser 600 includes a heater 650 on the opposite side of the freezer compartment 640 based on the bucket 630, and the heater 650 controls the temperature of the water in the bucket 630 or the dispenser 600. It is used to dissolve water when water freezes due to unused for a long time. On the other hand, the dispenser 600 has a temperature sensor 660 for this operation, the bucket 630 is provided with a groove 670 for mounting the temperature sensor 660.

However, conventional cooling devices do not provide a device for making a subcooled liquid, a device for making a slush from a subcooled liquid, a device for preventing the subcooling of the stored subcooled liquid and a device for recovering when the subcooling is released. It is not true.

The present invention is to solve the above problems, an object of the present invention is to provide a refrigerator, which can recover when the subcooled liquid is released.

In addition, an object of the present invention is to provide a refrigerator, which detects the subcooling of the supercooled liquid and recovers it.

It is another object of the present invention to provide a refrigerator which can prevent the supercooling of the supercooled liquid.

It is also an object of the present invention to provide a refrigerator, which can limit the movement of the supercooled liquid, thereby preventing the supercooled release of the supercooled liquid.

It is also an object of the present invention to provide a slush manufacturing apparatus and a slush manufacturing method which produce a supercooled liquid and then make slush therefrom.

It is also an object of the present invention to provide a refrigerator, which is provided with a subcooling release recovery means or a subcooling release preventing means, to produce a supercooled liquid or slush.

To this end, the present invention is located in the storage compartment for supplying cold air, the door opening and closing the storage compartment, the door side, the reservoir containing the supercooled liquid, the sensor for detecting a change in the state of the supercooled liquid, and interlocked with the sensor, It provides a refrigerator comprising a heater for supplying heat to. Through this configuration, it is possible to detect the release of the supercooled state through the sensor, and to recover it through the heater upon release of the supercooled state. For example, a temperature sensor can be used, and when the temperature sensor detects that the temperature of the supercooled water suddenly becomes a phase transition temperature (eg 0 ° C.), it can be determined that the supercooled liquid has been converted to a solid phase. Can be. Here, the release of the supercooling is when the external power is applied to the supercooled liquid and the solid phase is changed, when an abnormality occurs in the means for applying energy to maintain the supercooled state, when a power failure occurs and the supply of energy is stopped, the refrigerator malfunctions. Cases may occur.

The present invention also provides a refrigerator, characterized in that it comprises an energy generator for providing energy to the supercooled liquid to maintain the supercooled state.

In another aspect, the present invention provides a refrigerator, which is installed on the door and includes a case in which the reservoir is placed.

The present invention also provides a refrigerator, characterized in that the case comprises at least one of a heater, a sensor and an electrode for supplying energy to the supercooled liquid.

In another aspect, the present invention provides a refrigerator comprising a flow passage from the reservoir to the outside of the door. Through this configuration, the present invention can be applied to a general refrigerator dispenser structure.

In another aspect, the present invention provides a refrigerator, characterized in that provided in the reservoir, including a limiting member for preventing the movement of the supercooled liquid. Through such a configuration, it is possible to prevent the supercooled state from being released from an external impact or the like.

The present invention also includes a storage compartment for supplying cold air, a door for opening and closing the storage compartment, a storage tank located on the door side, and a storage tank containing the supercooled liquid, and a limiting member provided in the storage tank and preventing movement of the supercooled liquid. A refrigerator is provided. Through this configuration, it is possible to prevent the release of the supercooled state due to the impact of the opening and closing of the door.

The present invention also provides a refrigerator, characterized in that the restricting member divides the supercooled liquid in the reservoir into a plurality of compartments. Through this configuration, it is possible to suppress the movement of the entire supercooled liquid and to prevent the release of the supercooled state by the surface tension of the plurality of compartments.

In another aspect, the present invention provides a refrigerator comprising a; at least one plate for preventing the movement of the subcooled liquid. The plates here do not necessarily have to be in the form of flat plates.

The present invention also provides a refrigerator, characterized in that the limiting member is a means for applying pressure to hinder the movement of the supercooled liquid.

In another aspect, the present invention provides a refrigerator comprising a; heater for applying heat to the reservoir. This configuration makes it possible to return the state of the liquid from which the supercooling is released to the liquid phase.

In another aspect, the present invention provides a refrigerator comprising a; flow path from the reservoir to the outside of the door.

In another aspect, the present invention provides a refrigerator comprising a; energy generator for providing energy to the supercooled liquid to maintain the supercooled state.

The liquid does not necessarily need to be water, and the energy can be provided to the liquid or supercooled liquid in the form of an electric or magnetic field, but any form of energy (e.g., energy that allows the liquid to remain liquid below the phase transition temperature of the liquid) : Ultrasound, magnetron), and the present invention should be understood to include this form of energy.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

First, a method of preparing a supercooled liquid or slush according to the present invention will be described.

FIG. 8 conceptually illustrates the manufacture of a supercooled liquid or slush according to the present invention, according to the present invention first placing a liquid 41 subject to subcooling between the electrodes 40. Next, in the state where the cold air 42 is supplied, the electric field is applied to the liquid 41 using the alternating current power supply 43. As a result, the liquid 41 does not freeze below its phase transition temperature (for example, 0 ° C. in the case of water under 1 atm) and maintains a supercooled state. It is known that the freezing of water composed of oxygen and hydrogen is disturbed because energy such as an electric field is supplied and hydrogen bonding of water is disturbed. When an external force is applied to the supercooled liquid thus produced through the phase converter 44, for example, an electrical force is applied using an igniter, and the energy or applied energy to the supercooled liquid by this force is applied. The supercooled state maintained by energy (which, depending on the conditions, can be maintained even after the energy is applied for a certain period of time) can be disrupted, forming a freeze nucleus, and the supercooled liquid rapidly converts into a solid phase. As the slush is formed. At this time, the temperature of the supercooled liquid is changed from the temperature of the supercooled state to the phase transition temperature.

The experimental results actually performed according to the present invention are as follows.

1.Installation of electrode and container

Two electrodes 100 mm in length and width were installed at a distance of 200 mm. Then, a container containing 1 L of water was placed at a distance between the two electrodes.

2. Supercooling way

The device was placed in a refrigerator at a temperature of -6.8 ° C and an electric field was applied at 40 kHz, 2 kV. The electric field was applied at the same time as the device was placed in the refrigerator, and when it was judged that the subcooling was sufficiently performed, the supercooled liquid was converted into the solid phase by using a 1500 V electric lighter. The results are shown in FIG.

9 is a view showing one of the experimental results according to the present invention, showing a correlation between the applied power and the temperature of the supercooled liquid. This result shows that both are in a nearly linear proportional relationship, which means that under a given ambient temperature, by controlling the power given by the energy generator, the set temperature of the supercooled liquid can be controlled.

10 is a view showing an example of a refrigerator according to the present invention, wherein the refrigerator 60 includes a freezing chamber 61 and a refrigerating chamber 62. The freezer compartment 61 is provided with a freezer compartment door 61a, and the refrigerating compartment 62 is provided with a refrigerator compartment door 62b. The freezing chamber 61 has a flow path 63 through which water is supplied from the outside, and a region 64 on which the energy generator or the electric field is applied is formed on the flow path 63. The flow path 63 has an outlet 63a through which water flows out at the end thereof. Further, on the other end side, a valve 63b for controlling the water supply from the external water supply source (not shown) to the region 64 to which the electric field is applied is provided. The outlet 63a is opened by the outlet part 65 formed in the freezer compartment door 61a, and the outlet part 65 is provided with the operation lever 66 which opens and closes the outlet 63a. Between the outlet 63a and the region 64 where the electric field is applied, an electric shock 67 is provided as a phase converter. The cold air is generated in the freezing cycle 68 provided below the refrigerator 60, and is supplied to the freezing chamber 61 through the discharge port 68a connected thereto. The cold air may be supplied through a refrigerant pipe (not shown) formed to surround the freezing chamber 61.

Next, a method of operating the refrigerator according to the present invention will be described with reference to FIG. 14.

When the valve 63b is opened, water is supplied from the external water supply source (not shown) to the flow path 63. The water exchanges heat with the cold of the freezing chamber 61 in the region 64 where the energy generator or the electric field is applied, and receives the energy in the form of the electric field, thereby becoming supercooled water without phase change. When the user presses the operation lever 66 using a cup (not shown), the supercooled water flows out through the outlet 63a, and when the outflow occurs, a phase transition occurs by the operation of the shock pad 67, and the supercooling contained in the cup The water is converted into a solid phase and is in a slush state. This operation is controlled by the control unit of the refrigerator controlling the refrigeration cycle 68.

11 is a view showing another example of a refrigerator according to the present invention. Unlike the refrigerator illustrated in FIG. 6, the refrigerator 70 further includes a general ice maker 79. The refrigerator 70 includes a freezing compartment 71 and a refrigerating compartment 72. The freezer compartment 71 is provided with a freezer compartment door 71a, and the refrigerating compartment 72 is equipped with a refrigerator compartment door 72b. The freezing chamber 71 has a flow path 73 through which water is supplied from the outside, and an area 74 through which an energy generator or an electric field is applied is formed on the flow path 73. The flow path 73 has an outlet 73a through which water flows out at the end thereof. In addition, the flow path 74 includes a valve 73b for controlling the water supply from the external water supply source (not shown) to the flow path 73, a valve for controlling the supply to the ice maker 79, and an area 74 to which an electric electric field of water is applied ( 73c). The outlet 73a is opened by an outlet 75 formed in the freezer door 71a, and buttons 75a, 75b and 75c are provided above the outlet 75 to select the outflow of ice, supercooled liquid or slush. It is. A pedestal 75d is provided below the outlet portion 75, and a cup 75e is placed on the pedestal 75d. Between the outlet 73a and the region 74 to which the electric field is applied, an electric shock 77 is provided as a phase converter. The cold air is generated in the freezing cycle 78 provided below the refrigerator 70, and is supplied to the freezing chamber 71 through the discharge port 78a connected thereto. The cold air may be supplied through a refrigerant pipe (not shown) formed to surround the freezing chamber 71.

Next, a method of operating the refrigerator according to the present invention will be described with reference to FIG. 14.

When the valve 73b is opened, water is supplied to the flow path 73 from an external water supply source (not shown). This water is supplied to the ice maker 79 and the region 74 to which an energy generator or an electric field is applied according to the operation of the valve 73c, and the ice is made in the ice maker 79 by the cold air of the freezing chamber 71. In the region 74 to which the electric field is applied, the supercooled water is made without the phase change by receiving the electric field energy. When the user places the cup 75e on the pedestal 75d and selects one of the buttons 75a, 75b, 75c, ice, subcooled liquid or slush is supplied to the cup 75e via the outlet 75. do. At this time, operating the phase changer or stun gun 77 provides a slush, and if not operating the subcooled liquid. At first glance, while the supercooled liquid is provided to the cup 75e via the flow path 73, it can be considered that a freeze nucleus is formed and changed into a slush, but the supercooled liquid made using the energy generator according to the present invention is produced. Depending on the conditions, they were not changed to slush even after being provided from the energy generator to another vessel. Therefore, it can be seen that the phase converter according to the present invention plays a role of promoting slush formation and generating a freeze nucleus for slush formation. Instead of placing a separate phase converter on the flow path 73, the pedestal 73e may be positioned such that the frozen core can be formed by the potential energy flowing out of the outlet 73a (e.g., 20 cm, Subject to conditions of subcooling). This operation is controlled by the control unit of the refrigerator.

12 is a view showing another example of a refrigerator according to the present invention, wherein the refrigerator 80 includes a bucket 81 in an area to which an electric field is applied, and uses the electrode 82 in the bucket 81 to supply energy. It is the same as the refrigerator shown in FIG. 6 except that it is supplied. Through this configuration, compared to the case of applying energy to the water directly supercooled on the flow path, it becomes possible to make and supply the supercooled water stably (see FIG. 14).

FIG. 13 is a view showing another example of a refrigerator according to the present invention, wherein the refrigerator 90 is a refrigerator illustrated in FIG. 6 except that an area 94 to which an electric field is applied is provided in the refrigerating compartment door 92a. Is the same as In this case, the discharge port 92c is located adjacent to the region 94 to which the electric field is applied, and supplies the cold air provided from the freezing chamber 91 side through the damper 92b to the region 94 to which the electric field is applied. By providing it, it can be comprised so that water may be lowered below to a phase transition temperature (refer FIG. 14). Through this configuration, the present invention can be applied to a refrigerator having a structure in which the dispenser is provided in the refrigerating chamber. At this time, it is preferable that an area to which the electric field is applied is provided on the refrigerating compartment side. When the area to which the electric field is applied is located on the freezing compartment side, the passage of the supercooled water becomes long, and it may be difficult to control the supercooled water and slush. Because.

15 to 17 are diagrams showing examples of the configuration of the region to which the electric field is applied. In the example shown in FIG. 15, the flow path 2 passes through the region 1 to which the electric field is applied, and the outside of the passage 2 is shown. The structure with which the electrode 3a was formed is shown. The example shown in FIG. 16 shows the structure in which the electrode 3b was formed in the hose which comprises the flow path 2 via the flow path 2 through the area | region 1 to which an electric field is applied. In the example shown in FIG. 17, the region 1 to which an electric field is applied is located on the flow path 2, the bucket 4 is provided in the region 1, and the electrode 3c is disposed on the side of the bucket 4. The formed structure is shown. Preferably, the region 1 to which the electric field is applied consists of an electrical insulator.

18 is a view showing an example of a refrigerator provided with a supercooling release means according to the present invention, the refrigerator 500 includes a freezer compartment 510 and a freezer compartment door 520 for opening and closing the freezer compartment 510. The freezer compartment door 520 is filled with a heat insulator 530, and a flow passage 540 is formed in the freezer compartment door 520, and the flow passage 540 is connected to an external water supply source. Valve 550 for controlling the inflow, the water container 560 to exchange heat with the freezer compartment 510, the electrode 570 to apply energy in the form of electric field to maintain the water of the water tank 560, the temperature of the water tank The temperature sensor 580 for detecting the water, the outlet 540a for outflow of the water, and the heater 560a for returning the supercooled water to the liquid phase when the supercooling of the water contained in the bucket 560 is released is converted to the solid phase. It is provided. Opening of the outlet 540a is achieved by the user pressing the actuation lever 590.

Next, a method of operating the refrigerator according to the present invention will be described with reference to FIG. 19.

When the valve 550 is opened, water is introduced into the flow path 540 from an external water source (not shown), and water is preferably supplied to the water tank 560 by a pressure provided by the external water source. The water contained in the bucket 560 is cooled by heat exchange with the cold of the freezer compartment 510, while maintaining the supercooled state without freezing by the energy of the electric field form provided by the electrode 570. The freezer compartment door 520 is filled with the heat insulator 530, but the distance between the bucket 560 and the freezer compartment 510 is not far, so heat exchange may occur. Of course, the configuration in which the heat insulating material is removed in the heat exchange area is also possible. When the user presses the operation lever 590 into the cup, the outlet 540a is opened to supply the supercooled water to the cup. On the other hand, when the supercooled water is subjected to an external force such as radical opening and closing of the freezer compartment door 520, an abnormality occurs in supplying current to the electrode 570, or the refrigerator malfunctions, the supercooled water is released to be converted into a solid phase. Can be. When the supercooling is released, the supercooled liquid is converted into a solid phase and slushed, which changes its temperature to a phase transition temperature (eg 0 ° C. under 1 atmosphere), which is detected by the temperature sensor 580 and frozen It is transmitted to the control unit which controls the cycle 500a. Accordingly, the control unit operates the heater 560a to return the slush to the liquid state, and then operates the electrode 570 to bring the water back to the supercooled state. In some cases, the heater 560a may be operated so that the water in the slush state does not freeze without returning to the liquid state. This is because the slush can be discharged through the flow path 540.

20 is a view showing another example of a refrigerator having a supercooling release means according to the present invention, the refrigerator 700 includes a freezer compartment 710 and a freezer compartment door 720 for opening and closing the freezer compartment 710. A case 760a is provided inside the freezing compartment door 720. A water bottle 760 is located in the case 760a, and the case 760a is provided with a heater 760a, an electrode 770, and a temperature sensor 780. The water tank 760 may be a standalone type not connected to an external water source, or may have a form connected to an external water source. In the standalone case, a valve (not shown) must be provided so that water can communicate with the outlet 740a of the flow path 740 when the bucket 760 is placed in the case 760a. Meanwhile, a cold air duct 790 may be provided in the freezer compartment 710 to supply cold air to the bucket 760.

21 to 23 are views showing examples of the limiting member according to the present invention, wherein the limiting member shown in FIG. 21 is configured by forming a plurality of compartments 910 in the bucket 900, and a plurality of compartments 910. Suppresses the movement of the entire supercooled liquid and prevents the release of the supercooled state by using the surface tension with the supercooled liquid. The bottom of the plurality of compartments 910 is formed so as not to contact the bottom of the bucket 900 so that the supercooled liquid can communicate in the bucket 900. The restricting member shown in FIG. 22 is configured by forming a plate 920 that prevents the movement of the supercooled liquid in the bucket 900, and the restricting member shown in FIG. 23 prevents the movement of the supercooled liquid in the bucket 900. It is configured by having a mass member 930 that applies pressure to obstruct.

According to the refrigerator according to the present invention, when the subcooling of the subcooled liquid is released, it is possible to recover it.

In addition, according to the refrigerator according to the present invention, by detecting the subcooling of the subcooled liquid, it is possible to recover it.

In addition, according to the refrigerator according to the present invention, it is possible to prevent the overcooling of the supercooled liquid.

In addition, according to the refrigerator according to the present invention, by limiting the movement of the supercooled liquid, it is possible to prevent the overcooling of the supercooled liquid.

In addition, according to the refrigerator according to the present invention, it is possible to produce a supercooled liquid, and then to make a slush therefrom.

In addition, according to the refrigerator according to the present invention, the subcooled release recovery means or the subcooled release prevention means, it is possible to make the supercooled liquid or slush.

Claims (13)

A storage compartment for supplying cold air; A door for opening and closing the storage compartment; A reservoir located on the side of the door and containing the supercooled liquid; A sensor for detecting a change in state of the supercooled liquid; And, And a heater interlocking with the sensor and supplying heat to the storage tank. The method of claim 1, And an energy generator for providing energy to the supercooled liquid to maintain the supercooled state. The method of claim 1, Refrigerator, characterized in that it is installed on the door, the case in which the reservoir is placed. The method of claim 3, wherein And the case comprises at least one of a heater, a sensor, and an electrode for supplying energy to the supercooled liquid. The method of claim 1, And a flow passage extending from the reservoir to the outside of the door. The method of claim 1, And a limiting member provided in the storage tank and preventing the movement of the supercooled liquid. A storage compartment for supplying cold air; A door for opening and closing the storage compartment; A storage tank located on the door side and containing a supercooled liquid; And, And a limiting member provided in the storage tank and preventing the movement of the supercooled liquid. The method of claim 7, wherein And the restricting member divides the supercooled liquid in the reservoir into a plurality of compartments. The method of claim 7, wherein The restricting member includes at least one plate that prevents the movement of the supercooled liquid. The method of claim 7, wherein And the restricting member is a means for applying pressure to hinder the movement of the supercooled liquid. The method of claim 7, wherein And a heater that applies heat to the storage tank. The method of claim 7, wherein And a flow passage extending from the reservoir to the outside of the door. The method of claim 7, wherein And an energy generator for providing energy to the supercooled liquid to maintain the supercooled state.

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