KR20080003139A - Controlling method for refrigerator - Google Patents

Abstract

A method for controlling a refrigerator is provided to set non-freezing temperature of stored foods by adjusting energy amount and to perform a various non-freezing mode by allowing a user to select non-freezing temperature. A method for controlling a refrigerator comprises the steps of: discriminating if selecting degree of non-freezing state is possible or not(S71); setting degree of non-freezing state by a user(S72); discriminating if controlling degree of cooling is possible or not(S74); setting energy amount to be applied to a receiving space or stored foods in relationship between the degree of non-freezing state and energy amount under a constant cooling condition(S75); cooling the receiving space or foods in a predetermined degree if the controlling degree of cooling is fixed(S76); setting degree of cooling by refrigeration cycle and performing cooling operation(S77); setting energy amount according to a predetermined degree of non-freezing state and cooling degree(S78); and applying energy to the receiving space or stored foods for performing non-freezing(S79).

Description

CONTROLLING METHOD FOR REFRIGERATOR}

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows embodiment of the thawing and freshness holding | maintenance apparatus by a prior art.

FIG. 2 is a circuit diagram showing the circuit configuration of the high voltage generator 3 of FIG.

3 is a block diagram of a freezing refrigerator according to the present invention.

4A and 4B illustrate embodiments of a freezing refrigerator according to the present invention.

5a and 5b are graphs illustrating the supercooling phenomenon in the freezing refrigerator according to the present invention.

6A and 6B are correlation graphs between power and freezing temperature in the simplified freezing refrigerator according to the present invention.

7 is a flowchart of a first embodiment of a control method of a refrigerator according to the present invention.

8 is a flowchart of a second embodiment of a control method of a refrigerator according to the present invention.

<Description of the symbols for the main parts of the drawings>

20: load detection unit 30: refrigeration cycle

40: voltage generator 50: electrode

90: micom

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator, and more particularly, to a freeze freezer that controls a freeze state temperature by using a relationship between an amount of energy and a freeze state temperature.

BACKGROUND ART Conventionally, an electrostatic field atmosphere is created in a refrigerator, and thawing of meat and fish in the refrigerator is performed at a negative temperature. In addition to meat and fish, freshness of fruits is maintained.

This technique uses a supercooling phenomenon, which refers to a phenomenon in which the melt or solid does not change even when the melt or solid is cooled to below the phase transition temperature at equilibrium.

Such a technique includes the electrostatic field treatment method, the electrostatic field treatment device, and electrodes used in them.

1 is a view showing an embodiment of a thawing and freshness holding device according to the prior art, wherein the cold storage 1 is constituted by a heat insulator 2 and an outer wall 5, and the internal temperature control mechanism (not shown). Is installed. The metal shelf 7 installed in the interior of the storehouse has a two-stage structure, and on each stage, objects for thawing or freshness maintenance and ripening of vegetables, meat and fish are mounted. The metal shelf 7 is insulated from the bottom of the furnace by the insulator 9. The high voltage generator 3 can generate direct current and alternating voltage up to 0 to 5000 V, and the inside of the heat insulating material 2 is covered with an insulating plate 2a such as vinyl chloride. The high voltage cable 4 for outputting the voltage of the high voltage generator 3 is connected to the metal shelf 7 through the outer wall 5 and the heat insulator 2.

When the door 6 provided on the front side of the cold storage 1 is opened, the safety switch 13 (refer FIG. 2) which is not shown in figure is turned off, and the output of the high voltage generator 3 is interrupted | blocked.

2 is a circuit diagram showing the circuit configuration of the high voltage generator 3. AC 100V is supplied to the primary side of the voltage regulating transformer 15. Reference numeral 11 denotes a power supply lamp, and reference numeral 19 denotes a lamp indicating an operating state. The relay 14 operates when the above-mentioned door 6 is closed and the safety switch 13 is turned on. This state is indicated by the relay operation lamp 12. The relay contact ( 14a, 14b, and 14c are closed, and an AC 100V power source is applied to the primary side of the voltage regulating transformer 15.

The applied voltage is adjusted by the adjusting knob 15a on the secondary side of the voltage adjusting transformer 15, and the adjusted voltage value is displayed on the voltmeter. The adjusting knob 15a is connected to the primary side of the secondary boosting transformer 17 of the voltage adjusting transformer 15. In this boosting transformer 17, the boosting voltage is boosted at a ratio of 1:50, for example. When a voltage of 60V is applied, it is stepped up to 3000V.

_One end O ₁ of the secondary side output of the boosting transformer 17 is connected to the metal shelf 7 insulated from the cold storage via the high voltage cable 4, and the other end O _{2 of the} output is earthed. Moreover, since the outer wall 5 is earthed, even if the user of the cold storage 1 contacts the outer wall of the cold storage, there is no electric shock. In addition, if the metal shelf 7 is exposed in the furnace in FIG. 1, since the metal shelf 7 needs to be kept insulated in the furnace, it is necessary to separate it from the walls of the furnace (air insulates). . In addition, when the object 8 protrudes from the metal shelf 7 and contacts the inner wall, current flows to the ground through the high wall. Therefore, when the insulating plate 2a is attached to the inner wall, the drop of applied voltage is prevented. And even if the said metal shelf 7 is coat | covered with vinyl chloride material etc. without exposing in the inside, the whole inside becomes an electric field atmosphere.

First, the cold storage 1 according to the prior art controls only the magnitude of the voltage applied to the metal shelf 7 so that the supercooling is performed on the food, and by such adjustment, supercooling is caused even at -5 ° C. It prevents freezing.

This prior art is merely a technique for creating a non-freezing state using a supercooling phenomenon, and does not describe anything to adjust or control the non-freezing temperature, which is the temperature of food in the non-freezing state.

In order to solve this problem, it is an object of the present invention to provide a control method of a refrigerator that can set or adjust the freezing temperature of the storage by adjusting the amount of energy.

In addition, an object of the present invention is to provide a control method of a refrigerator capable of adjusting and setting the applied energy by using the relationship between the amount of energy and the freezing temperature of the stored object.

In addition, an object of the present invention is to provide a control method of a refrigerator that allows a user to select a freezing temperature of an object to perform a freezing mode of various states.

In addition, an object of the present invention is to provide a control method of a refrigerator for controlling the amount of energy applied or the degree of freezing by adjusting the degree of cooling.

The control method of the refrigerator of the present invention includes applying energy to a storage space for storing an object, and setting a freezing temperature of the storage space or the object according to the amount of energy applied.

In this case, the setting step is preferably set using a proportional relationship between the freezing temperature of the storage space or the object and the amount of energy.

In addition, the control method preferably further comprises the step of cooling the storage space or the object to a constant cooling temperature.

In addition, in the applying step, it is preferable to apply an electric field to the storage space or the object.

In addition, in the setting step, it is preferable to set the freezing temperature according to the cooling temperature and the amount of energy for the storage space or the article.

In addition, the control method of the refrigerator of the present invention includes the step of reading the freezing degree of the storage space or the stored object, and setting the amount of energy applied according to the read freezing degree.

In the following, the invention is explained in detail on the basis of the embodiments of the invention and the accompanying drawings. However, the scope of the present invention is not limited by the following embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

3 is a block diagram of a freezing refrigerator according to the present invention, Figures 4a and 4b are embodiments of the freezing refrigerator according to the present invention.

The non-freezing refrigerator 100 includes a load sensing unit 20 for detecting a state of the storage spaces A and B, a state of an object (not shown) stored in the storage spaces A and B, and a storage space ( A refrigeration cycle 30 for cooling A and B, a voltage generator 40 for generating a voltage to apply an electric field in the storage spaces A and B, and an electrode part for generating the electric field by applying the generated voltage. 50, a door detection unit 60 for detecting opening / closing of the door 120, an input unit 70 for receiving a degree of cooling, a freezing mode from the user, and a freezing refrigerator 100. The display unit 80 for displaying the operation state of the) and the microcomputer 90 performing the freezing mode using the supercooling phenomenon while performing the freezing or refrigerating control of the freezing freezer 100. However, although a power supply unit (not shown) for supplying power to the above-described elements is naturally provided, such a power supply is a technology clearly recognized by those skilled in the art to which the present invention pertains, and thus description thereof is omitted.

In detail, the load detector 20 detects or stores the state of the storage spaces A and B, and the state of the storage items stored in the storage spaces A and B, and informs the microcomputer 90 of the storage spaces. The load detector 20 stores information about the volume of the storage spaces A and B in the state of the storage spaces A and B, or senses the temperature of the storage spaces A or B. It may be a thermometer or a hardness meter, an ammeter or a voltmeter or a weight meter or an optical sensor (or a laser sensor) or a pressure sensor for checking whether the object is accommodated in the storage spaces A and B. In particular, the load sensing unit 20 may be an ammeter or a voltmeter, and when the storage spaces (A, B) are empty, and when there is an enclosure, the overall resistance value of the resistor through which the electric field flows is changed. Depending on the value, it can be checked whether or not it is stored. In addition, the microcomputer 90 may check the amount of the object and the water content of the object according to the resistance value from the load sensing unit 20, thereby identifying the kind of the object having the identified water content.

Next, the refrigeration cycle 30 is divided into inter-cooling and direct cooling according to the method for cooling the stored object. The embodiment of FIG. 4A is an intercooled, non-freezer refrigerator, and the embodiment of FIG. 4B is a direct-cooled, non-freezer refrigerator, and is described in detail below.

In addition, the voltage generator 40 generates an AC voltage according to a predetermined size and frequency. The voltage generator 40 may generate at least one of a magnitude of a voltage and a frequency of the voltage to generate an AC voltage. In particular, the voltage generator 40 applies an AC voltage corresponding to the set value (voltage magnitude, voltage frequency, etc.) from the microcomputer 90 to the electrode unit 50, and thus the electric field is stored in the storage space (A). , B). The voltage generator 40 in the present invention can vary the magnitude of the voltage within the range of 500V ~ 15kV by varying the frequency. In addition, the voltage generator 40 sets the frequency of the voltage in a high frequency range of 1 to 500 kHz.

The electrode unit 50 is a means for converting an alternating voltage from the voltage generating unit 40 into an electric field and applying it to the storage spaces A and B. The electrode unit 50 is usually made of a plate or conductive wire made of a material such as copper or platinum.

Since the electric field applied to the storage spaces A and B or the object by the electrode unit 50 is due to a high frequency AC voltage, the polarity thereof changes with frequency. Due to this electric field, water molecules composed of oxygen (O) with negative polarity and hydrogen (H) with positive polarity are continuously vibrated, rotated, and translated. The liquid phase is maintained even at a temperature below the phase transition temperature.

The door detection unit 60 stops the operation of the voltage generator 40 according to the opening of the door 120 that opens and closes the storage spaces A and B. The door detection unit 60 notifies the microcomputer 90 of the opening of the door 120. ) May perform the stop operation, or may be stopped by shorting the power applied to the voltage generator 40.

Input unit 70, in addition to the temperature setting for the general refrigeration and refrigeration control, the selection of the service type (flake ice, water, etc.) of the dispenser, the user selects to perform the freezing mode for the storage space (A, B) or the object This is the means by which you can enter. In addition, the user may input the package information such as the type of package through the input unit 70. The input unit 70 may be a bar code reader or an RFID reader, and may provide the microcomputer 90 with the information of the contents of the reading. In addition, the input unit 70 allows a user to input or select a non-freezing temperature (temperature at which the non-freezing state is maintained), which is a degree of freezing of the storage spaces A and B or the storage.

The display unit 80 may basically perform a freezing and refrigerating temperature display, a service type display of the dispenser, and may display that a freezing mode is currently being performed.

The microcomputer 90 performs basic refrigeration and freezing control, and allows the freezing mode according to the present invention to be performed.

When the microcomputer 90 maintains the storage spaces A and B or the free storage, the microcomputer 90 stores the relationship information between the amount of energy to be applied to the storage spaces A and B or the storage and the freezing temperature. Doing. Accordingly, the microcomputer 90 may control the setting and application of the amount of energy according to the freezing temperature or the calculation of the amount of energy and the calculation of the freezing temperature accordingly. The amount of energy here may be a variety of energy sources, the present invention uses the electric field energy.

The microcomputer 90 performs the freezing mode, but may set or change the freezing temperature at which the freezing mode is performed. This setting or variable can be performed by the microcomputer 90 from the relationship between the amount of energy disclosed below and the freezing temperature. For this purpose, the microcomputer 90 may control the voltage generator 40 to adjust the amount of energy according to the electric field applied from the electrode unit 50, and the adjustment of the amount of energy may be performed by the magnitude (or current) of the voltage. Size) and frequency, and the amount of energy can also be estimated from the correlation of voltage, current and frequency. This energy calculation is obvious to those skilled in the art to which the present invention pertains and thus will not be described.

In addition, the microcomputer 90 controls the operation of the non-freezing operation unit composed of the voltage generator 40 and the electrode unit 50, and simultaneously controls the cooling action by the freezing cycle 30, thereby freeing the refrigerator ( While reducing the power consumption of the 100), the control to efficiently maintain the freezing mode is also performed.

4A and 4B illustrate embodiments of a freezing refrigerator according to the present invention. Figure 4a is a cross-sectional view of the non-cooling refrigerator freezer, Figure 4b is a cross-sectional view of the direct-cooling non-freezer refrigerator.

The non-cold freezer of one side has an opening on one side and forms a storage space A therein, and a case 110 having a shelf 130 which partially divides the storage space A, and an open one surface of the case 110. The door 120 is opened and closed. The refrigeration cycle 30 of the intercooled freezer refrigerator includes a compressor 32 for compressing a refrigerant, an evaporator 33 for generating cold air (indicated by an arrow) for cooling the storage space A or the stored object, and A fan 34 forcing the cold air to flow, an inlet duct 36 for introducing cold air into the storage space A, and a discharge duct 38 for guiding the cold air passing through the storage space A to the evaporator 33. Is made of. In addition, the freezing cycle 30 may include a condenser, a dryer, an expansion device, and the like, which are not shown.

Electrode portions 50a and 50b are formed between the inner surfaces 112a and 112c facing the storage space A and the outer surface of the case 110, and each of the electrode portions 50a and 50b faces the storage space A. It is formed, so that the electric field can be applied to the entire storage space (A). In addition, the storage space A is spaced apart from the ends of the electrode portions 50a and 50b inwardly or in the center direction of the electrode portions 50a and 50b by a predetermined interval so that a uniform electric field is stored in the storage space A or the storage space. Allow to be applied to water.

In addition, the inlet duct 36 and the discharge duct 38 described above are formed on the inner surface 112b of the case 110. In addition, the surface of the inner surface (112a, 112b, 112c) of the case 110 is made of a hydrophobic material, so that the surface tension of water, such as water is reduced to prevent freezing during the non-freezing mode. Of course, the outer surface and the inner surface (112a, 112b, 112c) of the case 110 is made of an insulating material, so that the user is not electric shock from the electrode portions (50a, 50b) and at the same time the objects are inner surface (112a, 112b, The electrical contact with the electrode portions 50a and 50b through the 112c is prevented.

Next, the case 110, the door 120, and the shelf 130 of the direct-cooling non-freezing refrigerator of FIG. 4B are the same as the intercooling-freezing refrigerator of FIG. 4A, and the inner surfaces 114a, 114b, and 114c of the case 110. Compared with the case 112a, 112b, 112c, it is the same except for the inflow duct 36 and the discharge duct 38. FIG.

The freezing cycle 30 of the direct freezing freezing refrigerator of FIG. 4B is installed in the case 110 adjacent to the compressor 32 compressing the refrigerant and the inner surfaces 114a, 114b, 114c around the storage space B. It consists of an evaporator 39 which evaporates the refrigerant. However, the direct-cooling refrigeration cycle 30 is configured to include a condenser (not shown) and expansion valve (not shown).

In particular, the electrode portions 50c and 50d are inserted between the evaporator 39 and the case 110 to prevent the cold air from being blocked by the evaporator 39.

5a and 5b are graphs illustrating the supercooling phenomenon in the freezing refrigerator according to the present invention.

FIG. 5A is a diagram of experimental structures and conditions for FIG. 5B. As shown, the storage space (S1) is formed in the case 111, 0.1L of distilled water is contained in the storage space (S1), the electrodes 50e, 50f are symmetrically toward the storage space (S1). It is inserted into the side wall of the case 111 to be positioned. In addition, the electrode surfaces of the electrodes 50e and 50f facing the storage space S1 are formed wider than the surface of the storage space S1. The interval between these electrodes 50e and 50f is 20 mm. The case 111 is made of an acrylic material, and the case 111 is stored and cooled in a storage space (a refrigerating device which is a space without an additional electric field generating device other than the electrodes 50e and 50f) to which cold air is uniformly supplied.

At this time, the microcomputer 90 is a case where the voltage generator 40 applies 0.91 kV (6.76 mA) and an AC voltage of 20 kHz to the electrode unit 50, the temperature of the storage space is about -7 ℃. 5b shows that the freezing freezer 100 according to the present invention has a supercooling even at about -6.5 ° C. which is below a phase transition temperature, thus maintaining a freezing state of water.

6A and 6B are correlation graphs between power and freezing temperature in the simplified freezing refrigerator according to the present invention. 6A and 6B are applied to the same experimental structure as that of FIG. 5A, and the storage temperature (control temperature), that is, the internal temperature of the inside of the storage space in which the case 111 is housed, is fixedly controlled to -6 ° C. In this case, the microcomputer 90 sets and applies a plurality of power energy amounts applied to the voltage generator 40, and measures the change in the freezing temperature accordingly.

6A are graphs of freezing temperatures of water supplied with different amounts of power energy. As shown in FIG. 6A, the baseline O, to which no power energy is supplied, remains freeze to -5 ° C. by cooling and causes a phase transition to a frozen state 3 hours before cooling.

In addition, since the amount of energy applied to the first energy ray I (1.38W) is considerably large, the water is kept at almost 0 ° C even if the water is cooled at a phase transition temperature (1 atmosphere of 0 ° C) so that the supercooling phenomenon occurs. It doesn't happen at all.

The second energy ray II (0.98 W) maintains a freezing state due to the supercooling phenomenon, and the freezing temperature at that time is maintained at -3 to -3.5 ° C.

The third energy ray (III) (0.91 W) maintains a freezing state due to the supercooling phenomenon, and the freezing temperature at that time is maintained at -4 to -5 ° C.

The fourth energy ray IV (0.62W) is maintained in a freezing state due to the supercooling phenomenon, and the freezing temperature at that time is maintained at -5.5 to -5.8 ° C.

The fifth energy ray V (0.36W) does not reach the supercooled state and is frozen (phase shifted).

FIG. 6B is a graph showing the correlation between the first to fifth energy rays of FIG. 6A. As shown, it can be seen that in a state where constant cold air is supplied, the amount of energy applied to the water, which is an article, and the non-freezing temperature of the water, which is an article, have a proportional relationship. That is, the greater the amount of energy applied to the package, the higher the freezing temperature. The smaller the amount of energy applied to the package, the lower the freezing temperature. However, when determining such an amount of energy, if the amount of energy is too small, as described above, because the motion of the water molecules cannot be caused to adjust the supercooling state, the same result as the fifth energy ray can be obtained.

In addition, the freezing temperature according to the experiment is determined according to the amount of energy applied when the storage temperature (indoor temperature, high temperature) is -6 ℃, if the storage temperature is different, the amount of energy applied accordingly should also be changed. . Therefore, when the storage temperature is constant, the microcomputer 90 may store only correlation information between a simple amount of energy and a non-freezing temperature. Otherwise, when the storage temperature is adjusted or changed, the controlled storage temperature is considered. Correlation information between quantities and freezing temperatures shall be stored.

7 is a flowchart of a first embodiment of a control method of a refrigerator according to the present invention.

In detail, in step S71, the microcomputer 90 determines whether the freezing degree from the user is selectable through the input unit 70. If the selection is possible, the flow advances to step S71, otherwise the flow goes to step S73.

In step S72, the microcomputer 90 sets the degree of freezing according to the user input through the input unit 70 or previously selected selection. This freezing degree input or selection may be made at a specific temperature (eg -6 ° C, -8 ° C), or may be made of steel, medium, or weak indicating low and high temperatures.

In step S73, the microcomputer 90 does not provide a means or service for the user to input or select a separate freezing degree, and thus reads the fixed freezing degree. This degree of freezing may be, for example, -6 ° C, -8 ° C.

In step S74, the microcomputer 90 determines whether the cooling degree can be adjusted by the control of the freezing cycle 30 to cool the storage spaces A and B or the storage. This step (S74) is not required, if the refrigeration cycle 30 for cooling only the storage space (A, B) as shown in Figures 4a and 4b is not required, such as a vegetable or meat room of the refrigerator This is because the cooling degree cannot be controlled when it is controlled at a constant cooling degree (control temperature, high internal temperature, etc.), and thus the method of setting the amount of energy is different. If the degree of cooling is not mechanically or software adjustable, proceed to step S75; otherwise, proceed to step S77.

In step S75, the microcomputer 90 sets the amount of energy applied to the storage spaces A and B or the storage object according to the set or fixed freezing degree. At this time, the microcomputer 90 may set the amount of energy only in relation to the degree of freezing and the amount of energy in a situation where the degree of cooling is constant.

In step S76, the microcomputer 90 is a case in which the cooling degree is not adjusted or changed as described above, and thus the microcomputer 90 is cooled with respect to the storage spaces A and B or the storage object at a constant cooling level.

In step S77, the microcomputer 90 sets the degree of cooling by the freezing cycle 30 according to the set or fixed freezing degree and performs cooling. For example, when the freezing degree is -8 ° C, the cooling temperature for the storage spaces A and B or the object should be set to be at least lower than -8 ° C. In addition, at the same degree of freezing, when the current cooling temperature is -10 ℃ can be set to a temperature slightly lower than -8 ℃, it is possible to reduce the power consumption by cooling.

In step S78, the microcomputer 90 sets the amount of energy according to the set or fixed freezing degree, but the cooling degree set in step S77 must also be considered in this setting.

In step S79, the microcomputer 90 applies energy having the amount of energy set in step S75 or step S78 to the storage spaces A and B or the storage to perform freezing storage.

In this embodiment, steps S77 and S78 may be performed simultaneously. That is, while the microcomputer 90 sets the degree of cooling and the amount of energy at the same time according to the non-freezing degree, the relationship between the degree of cooling and the amount of energy is also reflected.

8 is a flowchart of a second embodiment of a control method of a refrigerator according to the present invention. The second embodiment is a control method when the amount of energy that is the intensity of the electric field that the microcomputer 90 can generate through the voltage generator 40 is constant.

In detail, in step S81, the microcomputer 90 transmits the predetermined fixed energy to the storage spaces A and B or the storage object through the non-freezing operation unit formed of the voltage generator 40 and the electrode unit 50. Is authorized. That is, the microcomputer 90 may not adjust the strength of the electric field.

In step S82, the microcomputer 90 determines whether the freezing degree can be selected in the same manner as in step S71 of FIG. 7.

In step S83, the microcomputer 90 sets the freezing degree selected or input.

In step S84, the microcomputer 90 sets the degree of cooling by the refrigeration cycle 30 to achieve this set freezing degree with a fixed energy, and the storage spaces (A, B) or Cool the enclosure. That is, in a fixed energy situation, to reduce the temperature according to the degree of freezing, increase the degree of cooling (reduce the control temperature), and to increase the temperature, decrease the degree of cooling (increase the control temperature).

In step S85, the microcomputer 90 reads the fixed freezing degree.

In step S86, the microcomputer 90 performs cooling according to a constant degree of cooling on the storage spaces A and B or the storage to achieve a fixed degree of freezing according to the fixed amount of energy.

The present invention of such a configuration has the effect of performing a variety of freezing mode by adjusting the amount of energy to set or adjust the freezing temperature of the enclosure.

In addition, the present invention has the effect that can be adjusted and set the energy by using the relationship between the amount of energy and the freezing temperature of the object.

In addition, the present invention has the effect of allowing the user to select the freezing temperature of the object to perform the freezing mode of various states.

In addition, the present invention has the effect of adjusting the amount of energy or freezing degree applied by the adjustment of the degree of cooling, and reduces the power consumption.

Claims (13)

Applying energy to a storage space accommodating the objects; And setting a freezing temperature of the storage space or the storage object according to the amount of energy applied. The control method according to claim 1, wherein the setting step is set by using a proportional relationship between the freezing temperature of the storage space or the storage material and the amount of energy. The method of claim 1, wherein the control method further comprises cooling the storage space or the storage object to a constant cooling temperature. The method of claim 1, wherein the applying of the electric power comprises applying an electric field to the storage space or the object. The method of claim 1, wherein the setting of the refrigerator comprises setting the non-freezing temperature according to a cooling temperature and an energy amount of the storage space or the storage object. Reading the degree of freezing of the storage space or the contents; And setting the amount of energy applied according to the read freezing degree. The method of claim 6, wherein the control method further comprises applying energy according to the set amount of energy to the storage space or the storage object. The method of claim 6, wherein the freezing degree corresponds to the freezing temperature of the storage space or the storage object. The control method according to claim 6, wherein the setting step is set by using a proportional relationship between the degree of freezing and the amount of energy. 10. The method of claim 6 or 9, wherein the control method further comprises the step of cooling the storage space or the object to a constant cooling temperature. 7. The method of claim 6, wherein the reading step reads a degree of freezing selected by a user. The control method according to claim 6, wherein the control method further comprises setting a degree of cooling of the storage space or the storage object according to the degree of freezing. The method according to claim 12, wherein the control method comprises applying an energy according to the set amount of energy and a cooling step according to the set degree of cooling.

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