JP2009019808A - Refrigerator and method for preventing dew condensation in refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent dew condensation in a refrigerator without providing a humidity sensor and a heater. <P>SOLUTION: When outside air temperature is lower than current carrying start temperature T<SB>L</SB>and a compressor 9 remains stopped over regulated stop time t<SB>S</SB>, a defrosting heater 14 attached to an evaporator 6 is energized and heated to raise temperature T in the refrigerator, and the operation of the compressor 9 is prompted by temperature rise. Since the defrosting heater 14 is provided to the evaporator 6, it is not necessary to separately provide a heater. Since the energization heating or disconnection of the defrosting heater 14 is determined according to the outside air temperature and temperature T in the refrigerator, stop time of the compressor 9, and energization time to the defrosting heater 14, it is not necessary to measure and control humidity by the humidity sensor. Therefore, simple and inexpensive control structure can be achieved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a condensation prevention method for preventing condensation from occurring in a refrigerator compartment of a refrigerator, and a refrigerator to which the condensation prevention method is applied.

  A general refrigerator will be described with reference to FIGS. 1 to 3. This refrigerator is composed of a plurality of compartments having different cooling temperatures such as a freezer compartment 3 and a refrigerator compartment 4. A partition wall 5 is provided between the chambers, and the partition wall 5 separates both cold airs having different temperatures from each other so as not to be mixed directly (see FIGS. 1 and 2).

Usually, the freezer compartment 3 is kept at about minus 20 ° C. and the refrigerator compartment 4 is kept at about 3-10 ° C., so that a temperature difference of 20 ° C. or more is generated between the two chambers 3, 4. For this reason, moisture contained in the cold air in the refrigerator compartment 4 or the like is condensed on the wall surface 5a on the side of the refrigerator compartment 4 or the like of the partition wall 5 cooled by the cold air in the freezer compartment 3 (that is, the wall surface side having a relatively high temperature). And condensing easily. Such condensation is likely to occur also in the partition wall 5 between the freezer compartment 3 and the vegetable compartment or the like whose set temperature is close to that of the refrigerator compartment 4.
This dew has a hygienic problem such as causing the growth of mold and various germs in the refrigerator compartment 4 and the like.

The amount of moisture (humidity) contained in the cold air varies with the operation or stop of the refrigeration cycle such as the compressor 9 and the evaporator 6 of the refrigerator shown in FIG.
That is, when the refrigeration cycle is operated, the evaporator 6 is cooled, and moisture in the cold air is condensed or defrosted on the evaporator 6 to dehumidify the cold air. It vaporizes and is discharged into the cold air, and the cold air is humidified. As for the humidification when the cooling cycle is stopped, the longer the stop time is, the more vaporization such as condensation occurs, so that the degree of humidification is further increased.
Therefore, condensation on the wall surface 5a of the partition wall 5 is likely to occur when the cooling cycle is stopped for a long time and the degree of humidification is increased.

In order to prevent this dew condensation, as shown in FIG. 6, a humidity sensor 18 is provided on the lower surface 2 a of the refrigerator door 2, and a heating heater 19 and a heating heater control switch 20 are provided in the vicinity of the humidity sensor 18. Has been proposed. When the measured value of the humidity sensor 18 exceeds a predetermined threshold value, it is determined that condensation has occurred on the lower surface 2a, and the warming heater 19 is energized and heated, whereby the cool air and the outside air in the refrigerator are heated. The condensation caused by the temperature difference is vaporized and eliminated (see paragraphs 0005 to 0014 of Patent Document 1).
JP-A-8-338679

The above conventional method for preventing dew condensation on the partition wall (inside the cabinet) has a problem that the number of parts increases and the cost increases because it is necessary to provide a humidity sensor, a heating heater, etc. as means for detecting and eliminating the occurrence of dew condensation. .
Further, since this humidity sensor is repeatedly wetted by condensation or dried by a heating heater, dust or the like adheres to the humidity sensor at this time, and the accuracy of humidity measurement tends to be lowered. For this reason, it is necessary to periodically perform maintenance to clean the surface of the humidity sensor.

The mounting position of the humidity sensor and the heating heater is not limited to the lower surface of the door, and can be provided, for example, on a partition wall in the refrigerator compartment. By heating the partition with the heating heater, condensation on the partition can be eliminated.
However, when the heating heater is provided in the partition wall between the freezer compartment and the refrigerator compartment in this way, the ceiling height of the refrigerator compartment is limited, so when storing bulky food or the like in the refrigerator compartment, (Heating heater) and food etc. may have to be placed close to each other. In this case, if the partition wall is heated by the heating heater, the food or the like is directly warmed by radiation from the partition wall (heating heater), and the freshness may be impaired.

  In view of this, an object of the present invention is to prevent condensation in the cabinet without providing a humidity sensor, a heating heater, or the like.

  In order to solve the above problems, the present invention increases the temperature in the refrigerator compartment to the temperature at which the refrigeration cycle starts operation by energizing and heating the defrost heater of the evaporator when the outside air temperature falls below the energization start temperature. However, the operation of this refrigeration cycle is encouraged.

The energization start temperature is an outside air temperature at which dew condensation does not occur in the interior (partition wall) until the refrigeration chamber is gradually warmed and the refrigeration cycle starts operation after the refrigeration cycle is stopped. This energization start temperature is appropriately set by experiments or the like in consideration of the heat insulating property of the refrigerator.
When the outside air temperature is higher than the energization start temperature, when the refrigeration cycle is stopped, the outside air warms up to a temperature at which the inside of the refrigerator starts the refrigeration cycle. Prompted.
On the other hand, if the outside air temperature is lower than the energization start temperature, the outside air cannot be easily warmed to the temperature at which the inside of the refrigerator starts the refrigeration cycle when the refrigeration cycle is stopped. Therefore, this refrigeration cycle remains stopped for a long time. As a result, as described above, dew condensation or the like of the evaporator is vaporized during the stop and the relative humidity is increased, so that dew condensation is likely to occur in the refrigerator compartment.
In that case, by operating this refrigeration cycle in a stopped state, moisture in the cold air in the refrigerator compartment is again condensed or defrosted on the evaporator, so that the relative humidity is reduced and the condensation on the partition wall is reduced. Is prevented.

The defrosting heater used in the present invention is provided for defrosting the evaporator, and its installation position is isolated from the refrigerating room storing food and the like. Therefore, when this defrost heater is energized and heated, there is a low possibility that the food or the like is directly warmed by radiation from the defrost heater.
When the defrost heater is heated by energization, the internal temperature rises thereby, and the operation of the refrigeration cycle is promoted by the temperature rise. When this refrigeration cycle is operated, moisture in the cold air in the warehouse is condensed on the cooled evaporator, and the cold air is dehumidified, so that condensation in the warehouse can be avoided.

  As a configuration of this invention, the interior of the refrigerator is divided into a freezer compartment and a refrigerator compartment, both chambers are cooled by a refrigeration cycle, and the refrigeration cycle is operated or stopped based on the interior temperature measured by the interior thermometer, In the method for preventing dew condensation in the refrigerator compartment of the refrigerator that defrosts the evaporator of the refrigeration cycle when the refrigeration cycle is stopped, when the refrigeration cycle is stopped, the outside air temperature starts to energize the defrost heater of the evaporator When the temperature falls below, the defrost heater can be energized and heated to raise the temperature of the inside of the refrigerator to a temperature at which the refrigeration cycle starts operation, thereby prompting the operation of the refrigeration cycle.

  In this dew condensation prevention method, the energization heating of the defrost heater can be started only when the refrigeration cycle has been stopped for a predetermined time.

The predetermined time refers to the time until the refrigeration cycle is humidified to such an extent that dew condensation on the evaporator evaporates and the dew condensation can occur in the refrigerator when the refrigeration cycle is stopped. .
As described above, the inside of the refrigerator is warmed by the outside air to increase its temperature, and the rising speed varies depending on the outside air temperature, the internal capacity of the refrigerator, the heat insulating performance, and the like. Therefore, for each refrigerator, the degree of increase in the internal temperature with respect to the outside air temperature is evaluated by experiments and the like, and the predetermined time is appropriately determined for each model in consideration of the heat insulating structure of the refrigerator.

  When this predetermined time has passed, the internal temperature rises by energizing and heating the defrost heater. Therefore, the operation of the refrigeration cycle is promoted accordingly, and dew is condensed in the cooled evaporator, thereby dehumidifying the cool air in the warehouse, so that condensation in the warehouse can be avoided.

  The energization heating of the defrost heater can be terminated when the outside air temperature exceeds the energization end temperature.

If the outside air temperature rises and the inside is warmed by the outside air temperature, it is not necessary to warm the inside by the defrost heater. When the outside air temperature at which the necessity is eliminated is the energization end temperature, and when that temperature is reached, energization of the defrost heater is terminated. This energization end temperature is also set as appropriate through experiments and the like in consideration of the heat insulation of the refrigerator.
For this reason, when the outside air temperature is lower than the energization start temperature, the inside of the refrigerator is difficult to be warmed by the outside air temperature, so the inside of the refrigerator is warmed by energization heating to the defrost heater, and the outside air temperature ends this energization. When the temperature is higher than the temperature, the outside air warms the inside of the cabinet and prompts operation of the refrigeration cycle before dew condensation.

  Regarding the electric heating of the defrost heater, the elapsed time after starting the electric heating of the defrost heater is measured, and the electric heating is terminated when the elapsed time reaches the specified energization time. Can do.

The specified energization time refers to a maximum time during which the energization heating is permitted when the defrost heater is energized and heated.
The reason for providing the specified energization time as described above is that if the defrost heater is continuously energized and heated for a long time, the internal temperature of the refrigerator rises and the freshness of food in the refrigerator may be deteriorated. In addition, if this energization heating is performed for a long time, a large amount of electric power is wasted.
The rate of temperature rise can vary depending on the refrigerator capacity, the output of the defrost heater, etc., so the specified energizing time is based on the heat insulation characteristics of the refrigerator taking into account the results of experiments etc. Set for each.

  In addition, the energization heating of the defrosting heater can be terminated when the outside air temperature reaches the energization end temperature after starting the energization heating and before reaching the specified energization time. .

  The purpose of the energization heating by the defrost heater is to promote the operation of the refrigeration cycle by warming the inside of the chamber. However, if the outside air temperature becomes higher than the energization end temperature, the outside air can store the outside air without performing the energization heating. This is because the inside can be warmed.

  Furthermore, the energization heating of the defrosting heater can be ended when the operation of the refrigeration cycle is resumed after the energization heating is started and before the specified energization time is reached.

  The purpose of the energization heating by the defrost heater is to promote the operation of the refrigeration cycle as described above, and the internal temperature measured by the internal thermometer is warmed to the temperature at which the refrigeration cycle starts operating. This is because it is no longer necessary to perform energization heating with this defrost heater.

This energization end temperature is set slightly higher (several degrees Celsius) than the energization start temperature. As described above, the energization heating by the defrost heater can be performed when the outside air temperature decreases and falls below the energization start temperature, and ends when the outside air temperature rises and exceeds the energization end temperature.
For this reason, in order for this defrost heater to be energized and heated, it is essential that the energization end temperature is higher than the energization start temperature, and in order for this energization heating to be performed stably, both temperatures are too close. However, as described above, it is preferably about several degrees C.

If these two temperatures are close to each other (for example, when there is almost no difference between them), even if the outside air temperature reaches the energization start temperature and the defrost heater is energized and heated, the variation in the outside air temperature The measured outside temperature may reach the energization end temperature in a short time due to (fluctuation of measured value due to measurement error).
In such a case, there arises a problem that energization of the defrosting heater is terminated without sufficient heating.

In this case, for example, if the energization start temperature is 20 ° C. and the energization end temperature is 23 ° C. and a temperature difference of about 3 ° C. is provided, the outside air temperature hardly fluctuates within the range of this temperature difference. Thus, the above problem can be avoided.
The specific values of the energization start temperature and the energization end temperature can be appropriately changed with reference to the results of experiments and the like that take into account the internal capacity of the refrigerator, the heat insulation structure, and the like.

  The energization heating by the defrost heater is performed when the outside air temperature exceeds the energization end temperature, when the elapsed time from the start of energization heating reaches the specified energization time, and before the specified energization time is reached, It can also be terminated at any time when cycle operation is resumed.

  If either of these conditions is met, the operation of the refrigeration cycle is started or the start of the refrigeration cycle is started, so that it is no longer necessary to warm the refrigerator compartment by energization heating of the defrost heater.

Moreover, this dew condensation prevention method can also be applied to refrigerator operation control.
Since dew condensation does not occur on the partition wall in the refrigerator when the refrigerator is used, the sanitation in the refrigerator is maintained and the defrost heater is provided at a position isolated from the food etc. Therefore, it is possible to avoid the food being directly warmed and its freshness being deteriorated.

  According to this invention, in order to prevent dew condensation in the refrigerator compartment, the humidity sensor and the heating heater are not used, but the defrosting heater of the evaporator is used. Therefore, the configuration can be made simple and inexpensive.

A cross-sectional view of a refrigerator that controls the dew condensation prevention operation by this dew condensation prevention method will be described with reference to FIGS.
This refrigerator has substantially the same structure as a general refrigerator, and its outer shape is configured by a box 1 and a door 2 provided at an opening of the box 1 (see FIG. 1). The box 1 is divided into a freezer compartment 3 and a refrigerator compartment 4, and the compartments 3 and 4 are separated by a partition wall 5 (see FIG. 2). In the upper part of the freezer compartment 3 and the refrigerator compartment 4, refrigeration cycle-related devices such as an evaporator 6, an internal fan 7, an internal fan motor 8, a compressor 9, a condenser 10, and a condensing fan 11 are arranged. (See FIG. 3). The freezer compartment 3 and the refrigerator compartment 4 are cooled by the operation of the refrigerating cycle including the evaporator 6, the compressor 9, the condenser 10, and the like.

  The cold air generated around the evaporator 6 by the operation of the refrigeration cycle is discharged into the freezer compartment 3 by the blowing of the internal fan 7 (arrow f in the figure). A part of the cold air is sent into the refrigerating chamber 4 through the cold air inflow passage 12 formed in the partition wall 5, and returned to the vicinity of the evaporator 6 through the cold air outflow passage 13 (arrow f in the figure).

  The evaporator 6 is provided with a defrost heater 14 for melting frost attached to the evaporator 6 and an evaporator temperature sensor 15 for measuring the temperature of the evaporator 6.

  Further, an outside air temperature sensor 16 is provided on the outer surface of the box 1 and an inside temperature sensor 17 is provided in the refrigerator compartment 4, and the outside air temperature and the inside temperature are respectively measured by these sensors.

The operation pattern of this refrigerator will be described with reference to FIG.
This refrigerator performs its operation control according to an operation mode of either a cooling operation or a defrosting operation.

In the cooling operation, the refrigeration cycles such as the compressor 9 and the internal fan 7 are appropriately operated or stopped so that the internal temperature T measured by the internal temperature sensor 17 falls within the temperature range of the set temperature T _S ± 3 ° C. The temperature is adjusted. During this cooling operation, the defrost heater 14 is in a stopped state.
The set temperature T _S is substantially like the typical refrigerator may appropriately adjusted in the range of 10 ° C. from minus 5 ° C..

  In the defrosting operation, the refrigeration cycle of the compressor 9 and the internal fan 7 is stopped and the defrost heater 14 is energized and heated to melt the frost on the evaporator 6. The energization to the frost heater 14 is stopped. After this energization is stopped, it is left as it is, and draining is performed by dripping molten water of frost from the surface of the evaporator 6 (see FIG. 4).

  When the cooling operation is performed after draining, the compressor 9 is first operated (see “refrigeration cycle preliminary operation” in the figure), and the internal fan 7 is rotated with a delay. The reason for delaying the timing of rotating the internal fan 7 in this way from the timing of operating the compressor 9 is that the evaporator 6 may still be heated after draining, and immediately at this stage This is because if the internal fan 7 is rotated, the warm air in the vicinity of the evaporator 6 may be sent to the freezer compartment 3 and the refrigerator compartment 4.

  Next, the control flow of this dew condensation prevention operation will be described with reference to FIG.

In this control flow, a check is first made as to whether or not the outside air temperature is 20 ° C. or less of the energization start temperature _TL , and if it is 20 ° C. or less, the process proceeds to the next step (S1 in the figure). This is because if the outside air temperature is 20 ° C. or higher, the inside of the refrigerator compartment 4 can be warmed by the outside air and the refrigeration cycle (compressor 9 or the like) can be operated, so that control by this dew condensation prevention operation is not required.

  Next, the operation of the refrigeration cycle of the compressor 9 or the like is checked, and if it is stopped, the process proceeds to the next step (S2 in the figure). This is because if the compressor 9 is in operation, the evaporator 6 has already been cooled, and it is not necessary to perform this dew condensation prevention operation.

  When both the conditions of S1 and S2 are met, the dew condensation prevention control mode is set (S3 in the figure). This dew condensation prevention control mode is a preparatory mode before energizing and heating the defrosting heater 14 later, and measurement of the stop time of the compressor 9 is started simultaneously with this mode setting.

  Next, the operation of the outside air temperature sensor 16, the evaporator temperature sensor 15, and the internal fan motor 8 is checked, and if normal operation can be confirmed, the process proceeds to the next step (S4 in the figure). If there is an abnormality, the condensation prevention control mode is canceled (S5 in the figure), and this control flow is terminated. This is because, if there is an abnormality in each of these sensors or the like, it is impossible to correctly control the condensation prevention operation.

The outside air temperature sensor 16 perform measurement of outside air temperature, if the measurement result is lower than 23 ° C. is energized termination temperature T _U goes to a next step (S6 in FIG). If this measurement result is 23 ° C. or higher, the inside of the refrigerator compartment 4 is warmed by the outside air, so it is determined that there is no need to perform control by this dew condensation prevention operation, and the dew condensation prevention control mode is canceled (S5 in the figure). This control flow is finished.

Next, the operation or stop state of the compressor 9 is checked, and if the stop state continues, the process proceeds to the next step (S7 in the figure). The compressor 9 is operated or stopped so that the internal temperature measured by the internal temperature sensor 17 falls within the temperature range of the set temperature T _S ± 3 ° C. For example, when the set temperature T _S and 4 ° C., the temperature adjustment is performed to fit the temperature range of 7 ° C. from 1 ° C..

If the internal temperature T exceeds the above temperature range during the execution of this control flow, the compressor 9 enters the operating state and the cooling operation is resumed. In this case, it is determined that there is no need to perform the control by the dew condensation prevention operation, the dew condensation prevention control mode is canceled (S5 in the figure), and this control flow is ended.
The set temperature T _S and the width of the temperature range (above ± 3 ° C.) can be adjusted as appropriate.

Next, the operation of the defrosting operation or the stop state is checked, and when the stop state of the defrosting operation is continued, the process proceeds to the next step (S8 in the figure). This defrosting operation is performed independently by control different from the control flow of this dew condensation prevention operation, and when the temperature of the evaporator 6 measured by the evaporator temperature sensor 15 is lower than a predetermined temperature, the defrosting heater 14 is operated. Is defrosted by energization heating.
By performing this defrosting operation, the defrost heater 14 is energized and heated, and the same effect as this dew condensation prevention operation is obtained. Therefore, when the defrost operation is started, the dew condensation prevention control mode is canceled (same as above). This control flow is finished in S5).

It was then started with setting the dew condensation preventing control mode, when the stop time of the compressor 9 has reached a predetermined stop time t _S (25 minutes in this example) (S9 in FIG.), Condensation in the refrigerating compartment 4 When the defrost heater 14 is energized and heated, a time limiter that measures the energization time of the defrost heater 14 is started (S10 in the figure).

In this case the measured time of the time the limiter exceeds a specified energization time t _H (in this example, 20 minutes) (S11 in FIG.), To release the anti-condensation control mode stops the energization of the defrost heater 14 ( The control flow is ended in S12) of FIG. This is because if the heating time in the defrosting heater 14 is longer than this, there is a risk of adversely affecting food in the cabinet, and power consumption is wasted.

Next, it is determined whether or not the evaporator temperature measured by the evaporator temperature sensor 15 is equal to or higher than the defrost return temperature T _UP (S13 in the figure). The defrost return temperature T _UP is a predetermined temperature in the control flow of the above-described defrost operation (an independent control flow different from this dew condensation prevention operation), and can be set to 9 ° C., for example. When the evaporator temperature reaches the defrosting return temperature T _UP , the evaporator 6 is sufficiently warm and the compressor 9 is in a state where the operation can be resumed quickly. And the dew condensation prevention control mode is canceled (S12 in the figure), and this control flow ends.

  Next, an operation check of each sensor of the outside air temperature sensor 16, the evaporator temperature sensor 15, and the internal fan motor 8 is performed, and if there is no abnormality, the process proceeds to the next step (S14 in the figure). If there is an abnormality, the energization of the defrosting heater 14 is stopped and the dew condensation prevention control mode is canceled (S15 in the figure), and this control flow is ended. This is because if the sensors are abnormal, correct dew condensation prevention operation cannot be controlled.

The outside air temperature sensor 16 perform measurement of outside air temperature, if the measurement result is lower than 23 ° C. energization end temperature T _U goes to the next step (S16 in the same figure). If this measurement result is 23 ° C. or higher, the inside of the refrigerator compartment 4 is warmed by the outside air, so it is determined that it is not necessary to perform control by this dew condensation prevention operation, and the energization of the defrost heater 14 is stopped and the dew condensation prevention control is performed. The mode is canceled (S15 in the figure), and this control flow is ended.

  Further, the operation or stop state of the compressor 9 is checked, and when the stop state continues, this loop (S11 → S13 → S14 → S16 in the figure) remains in a state where the defrost heater 14 is energized and heated. (→ S17 → S11 →...) Each determination is continued.

The determination conditions for each determination performed in this control flow can be changed as appropriate.
For example, when food with a large amount of water is stored in the refrigerator compartment 4, the relative humidity in the refrigerator compartment 4 becomes high and condensation tends to occur.
In this case, one or both of the energization start temperature T _L (“20 ° C. or lower” above) and the energization end temperature T _U (“23 ° C. or higher” above) are set higher by about several degrees C. In this way, the dew condensation prevention control mode is easily set or is not easily released, and the defrosting heater 14 is easily energized and heated. Therefore, condensation in the refrigerator can be effectively prevented.

Further, the stop time (specified stop time t _S ) (“25 minutes” in the above) of the compressor 9 until the defrost heater 14 is energized and heated can be set shorter. In this way, as in the case where the outside air temperature determination condition is changed, the setting of the dew condensation prevention control mode and the energization heating of the defrost heater 14 are performed quickly, so that the dew condensation can be effectively prevented.

  In the above embodiment, the inside of the refrigerator was partitioned into two chambers, the freezer compartment 3 and the refrigerator compartment 4, by the partition wall 5, but the inside of the refrigerator was close to the freezer compartment 3, the refrigerator compartment 4, and the cooling temperature. It goes without saying that the present invention can be adopted if the refrigerator is partitioned into a vegetable room, a chilled room, or the like.

External view of the refrigerator according to the present invention Front sectional view of the refrigerator according to the present invention AA sectional view in FIG. 1 of the refrigerator according to the present invention. The figure which shows the control pattern of the control mode which concerns on this invention The figure which shows the flowchart in the control mode which concerns on this invention The perspective view which shows the dew condensation prevention apparatus of the refrigerator concerning a prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Box body 2 Door 3 Freezer compartment 4 Refrigerating compartment 5 Bulkhead 5a Wall surface 6 Evaporator 7 In-compartment fan 8 In-compartment fan motor 9 Compressor 10 Condenser 11 Condenser fan 12 Cold air inflow path 13 Cold air outflow path 14 Defrost heater 15 evaporator temperature sensor 16 outside air temperature center in 17-compartment temperature sensor 18 humidity sensor 19 heating heater 20 heating the heater control switch T box temperature _{T S} the set temperature _{T L} energization start temperature _{T U} application end temperature _{T UP} defrost recovery temperature t _H specified energization time t _S specified stop time

Claims (7)

The inside of the refrigerator is divided into a freezer compartment (3) and a refrigerator compartment (4) by a partition wall (5), both chambers (3, 4) are cooled by a refrigeration cycle, and the refrigeration cycle is operated or operated based on the internal temperature. When the refrigeration cycle is stopped, the defrost heater (14) is energized and heated to defrost the evaporator of the refrigeration cycle.
When the refrigeration cycle in which defrosting is not performed by energization heating to the defrost heater (14) is stopped, the outside air temperature is set to the energization start temperature (T _L ) to the defrost heater (14) of the evaporator (6). When the temperature falls below, the defrost heater (14) is energized and heated, and the inside of the refrigerator is heated to a temperature at which the refrigeration cycle starts to operate, thereby urging the operation of the refrigeration cycle. Condensation prevention method in refrigerated room.   The energization heating of the defrosting heater (14) is started for the first time when the refrigeration cycle has been stopped for a predetermined time. The method for preventing dew condensation in the refrigerator compartment of the refrigerator. The energization heating of the defrost heater (14) is finished when the outside air temperature exceeds the energization end temperature (T _U ). Condensation prevention method. The elapsed time from the start of energization heating of the defrosting heater (14) is measured, and this energization heating is also terminated when this elapsed time reaches the specified energization time (t _H ). The dew condensation prevention method in the refrigerator compartment of the refrigerator of Claim 1 or 2. After starting the energization heating of the defrosting heater (14), the energization heating is terminated when the operation of the refrigeration cycle is resumed before reaching the specified energization time (t _H ). The dew condensation prevention method in the refrigerator compartment of the refrigerator of Claim 1 or 2 to do. After the energization heating of the defrost heater (14) is started, when the outside air temperature exceeds the energization end temperature (T _U ), the elapsed time from the start of the energization heating becomes the specified energization time (t _H ). 2. When the operation of the refrigeration cycle is restarted before reaching the specified energization time (t _H ), the energization heating is terminated at any time. 3. A method of preventing dew condensation in the refrigerator compartment of the refrigerator according to 2.   A refrigerator characterized in that the condensation prevention operation in the refrigerator compartment is controlled by the condensation prevention method according to any one of claims 1 to 6.

Images