JP3153649B2 - refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative refrigerator in which the interior of a refrigerator is kept cool by using a heat storage material.

[0002]

2. Description of the Related Art In recent years, a regenerative refrigerator that cools the inside of a refrigerator using a regenerative material has been proposed from the viewpoint of effective use of late-night power or leveling by peak-cutting power demand.
This is considered as disclosed in Japanese Patent No. 58068.

An example of the above-described conventional regenerative refrigerator will be described below with reference to the drawings.

FIG. 8 is a longitudinal sectional view showing the structure of a conventional regenerative refrigerator, and FIG. 9 is a refrigeration system diagram. FIG.
9, reference numeral 1 denotes a cabinet 0 net 2 having a heat insulating material, a door 3, a door 3 and a cabinet 2.
And a gasket 14 for sealing. The interior is partitioned into two compartments, an upper freezer compartment 17 and a lower refrigerating compartment 18 by an intermediate partition wall 16 arranged horizontally.

A compressor 4 is connected to a three-way solenoid valve 6 via a condenser 5. Further, a first outlet 6a of the three-way solenoid valve 6 is connected to the compressor 4 via a capillary 7, a cooler 8, and an accumulator 13 in this order. The second outlet 6b of the three-way solenoid valve 6
The accumulator 13 is successively connected via a heat storage capillary 9 and a heat storage 10 in which a heat storage material 15 is filled.
Connected. Further, a closed loop type thermosiphon 12 is provided between the cooler 8 and the regenerator 10 as a heat transfer path, and a solenoid valve 11 for the regenerator is provided in the middle of the closed loop type thermosiphon 12. Is arranged. The closed loop type thermosiphon 12 is, for example, a gravity type, and a refrigerant is sealed in the closed looped pipe.

Reference numeral 19 denotes a cooling fan for cooling the inside of the refrigerator.
0 and the freezer compartment lower outlet 21 can send out cool air. A freezer compartment suction port 22 is provided in front of the intermediate partition wall 16 on the freezer compartment side, and a freezer intermediate duct 23 extending from the freezer inlet 22 to the cooler 8 is formed horizontally.
In the back of the cooler 8, the refrigerator compartment duct 2 extending from the cooling fan 19 to the refrigerator compartment outlet 24 along the back of the refrigerator.
5 are provided vertically. The refrigerating compartment outlet 24 can be opened and closed by a damper 26. The intermediate partition 1
6, a refrigerator compartment suction port 27 is provided in front of the refrigerator compartment side.
A refrigerator intermediate duct 28 extending from here to the cooler 8 is formed horizontally. A glass tube heater 29 is arranged at the outlet of the refrigerator compartment intermediate duct 28, and enables the defroster 8 disposed above the glass tube heater 29 to be defrosted.

FIG. 8 shows a refrigerator constructed as described above.
The operation will be described with reference to FIG.

In the normal cooling operation, the coil of the three-way solenoid valve 6 is not energized, the first outlet 6a is communicated, and the compressor 4 passes through the condenser 5, the three-way solenoid valve 6, and the capillary 7 sequentially. The refrigerant flow from the cooler 8 to the compressor 4 via the accumulator 13 is formed. The cooler 8 cools the inside of the refrigerator.

On the other hand, in the heat storage operation, the three-way solenoid valve 6
When the coil is energized, the second outlet 6b communicates with the coil 4 to reach the regenerator 10 via the condenser 5, the three-way solenoid valve 6 and the capillary 7 in sequence, and the accumulator from the regenerator 10. A refrigerant flow path to the compressor 4 through the refrigerant storage 13 constitutes the heat storage material 1 in the heat storage 10.
5 is cooled.

The heat storage and cooling operation is performed by the heat storage solenoid valve 1.
By opening 1, the closed loop type thermosiphon 12 cools the regenerator 10 to the cooler 8 and uses the heat to cool the inside of the refrigerator.

[0011] Each operation is controlled by a timer function (not shown). During the night when power demand is low (from 23:00 to 7:00 of the next day), the heat storage operation and the normal cooling operation are alternately performed by the timer operation, so that the heat storage material 15 is sufficiently cooled while keeping the internal temperature at the set temperature. For three hours during peak hours (13:00 to 16:00) during the daytime power demand, constant-time regenerative cooling operation is performed instead of normal cooling operation requiring a large amount of electric power to reduce the temperature in the refrigerator. keep.

The defrosting of the cooler 8 is performed by accumulating the operation time of the compressor 4 and when the accumulated time reaches an arbitrary time, the glass tube heater 29 is energized to perform defrosting. An arbitrary time is set so that the number of times of defrosting is about twice a day.

[0013]

However, in the above configuration, since the freezing compartment is included in the heat storage / cooling operation, it is necessary to use a heat storage material having a small latent heat of fusion and having a melting temperature of around -30 ° C. Yes, the effective internal volume of the refrigerator is greatly reduced. In addition, in order to freeze the heat storage material having a melting temperature of around -30 ° C, the evaporation temperature becomes around -40 ° C, and the refrigeration efficiency of the compressor becomes worse than in the normal cooling operation, so that the power consumption increases.

Further, the defrosting start time of the cooler is determined by the operation rate of the compressor, and the defrosting is started in the daytime when power demand is high because the use condition differs depending on the customer.
There was a problem that the power demand was uneven and that the power could not be used effectively.

The present invention has been made to solve the above-mentioned problem. Since the object of the heat storage cooling operation is only the refrigeration temperature portion, a heat storage material having a large amount of latent heat of fusion can be used, and a decrease in the effective internal volume of the refrigerator can be suppressed as much as possible. The evaporation temperature at the time of freezing the heat storage material can be equal to or higher than that during normal operation, and there is no increase in power consumption. Furthermore, since the defrosting start time of the cooler is set at night when the power demand is small irrespective of the use state of the customer, it is intended to provide a refrigerator that can level the power demand and thereby effectively use the power.

In order to solve the above-mentioned problems, a refrigerator according to the present invention has a refrigerating cycle in which a cooler and a heat accumulator having a heat accumulating material therein are connected in parallel, and a heat accumulator for accumulating heat in the heat accumulator at any time. Time control means for performing time control of a heat storage cooling operation for cooling the inside of the refrigerator with the operation and the stored heat, wherein a melting temperature of the heat storage material is higher than a freezing room temperature.
Degree, and the weight of the heat storage material is the ambient temperature of the refrigerator.
Before the predetermined time period is large daytime power demand at low ambient temperatures <br/> than the ambient temperature in summer in the annual change
Of the storage room in the refrigerator, a heat amount equivalent to the total load heat amount of the storage room in the refrigeration temperature zone is a weight capable of storing all heat, and the target load heat amount of the heat storage cooling operation is the storage amount in the refrigerator storage room.
Of these, the total load calorie of the storage room in the refrigerated temperature zone .

Further, a heat storage temperature detecting means for detecting the temperature of the heat storage material and a heater for defrosting the cooler are provided, and the time control means starts the cooler at the beginning of a predetermined time period during which nighttime power demand is low. The defrosting is performed, and after completion of the defrosting, the compressor is continuously operated until the end of the heat storage of the heat storage material is detected by the heat storage temperature detecting means, and heat is stored by the heat storage operation for all times other than the normal cooling operation. The heat storage / cooling operation is started so that the cooling operation time period includes at least a daytime power demand peak time period, and the heat storage temperature detecting means detects that the cooling capacity of the heat storage device has run out. The heat storage cooling operation ends.

Further, there is provided a heat storage temperature detecting means for detecting the temperature of the heat storage material and a heater for defrosting the cooler, and the heat storage temperature detecting means is provided by a time control means from a predetermined time zone during which nighttime power demand is low. The compressor is continuously operated until the end of the heat storage of the heat storage material is detected, and heat is stored by the heat storage operation for all times other than the normal cooling operation, and the cooler is defrosted after the heat storage operation is completed. The heat storage / cooling operation is started so that at least the daytime power demand includes a peak time period, and the heat storage / cooling operation is performed by detecting that the cooling capacity of the heat storage device is lost by the heat storage temperature detecting means. The operation ends.

[0019]

According to the present invention, a heat storage material having a large amount of latent heat of fusion can be used, the decrease in the effective internal volume of the refrigerator can be suppressed as much as possible, and the power consumption does not increase.

Further, since the defrosting start time of the cooler is performed at the beginning of the night when the power demand is small irrespective of the use condition of the customer, the power demand can be leveled and the power can be effectively used.

Further, since the defrosting start time of the cooler is performed after the heat storage operation at night when the power demand is small irrespective of the use condition of the customer, the power demand can be leveled and the power can be effectively used, and the power can be reliably used during the night. The heat storage material can be frozen.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigerator according to one embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a functional block diagram of a refrigerator according to an embodiment of the present invention, FIG. 2 is a diagram of a refrigeration system according to an embodiment of the present invention, and FIG. FIG. 4 is an electric circuit diagram, FIG. 4 is a flowchart in one embodiment of the present invention, and FIG. 5 is a one-day operation state diagram according to room temperature in one embodiment of the present invention.

In FIG. 1 and FIG. 3, reference numeral 30 denotes a cool box main body, which comprises a cabinet 2 containing a heat insulating material, a door 3, and a gasket 14 for sealing the door 3 and the cabinet 2. The interior thereof is divided into two sections by the horizontally arranged heat-insulating partition wall 33 and the upper freezer compartment 17 and the lower refrigerator compartment 18.
It is divided into rooms.

Reference numeral 62 denotes a cooling room provided in the freezing room 17. The cooling room 62 houses the cooler 8, the cooling fan 19, and a heater 58 for defrosting the cooler.

In the heat insulation partition wall 33, a ventilation passage A37 connecting the refrigerator compartment suction port 35 and the cooling chamber 62 by connecting the partition wall 38 and a ventilation passage B39 connecting the refrigerator compartment suction port 35 and the cooling chamber 62 are provided. Has formed. Numeral 31 denotes a heat storage unit in which the heat storage material 32 is filled inside the ventilation passage B39, and 56 denotes a heat storage material temperature sensor 5 attached to the heat storage unit 31.
Reference numeral 7 denotes a heat storage temperature detecting means for detecting the temperature of the heat storage material 32, and reference numeral 36 denotes a freezer compartment suction port.

Numeral 34 denotes an air path switching damper, which is provided on the partition wall 38. The air path switching damper 34 includes an air path switching unit 61.
34a closing the ventilation passage B39 by the
37 is switched to two stages of closing 34b.

Reference numeral 26 denotes a damper for controlling the amount of cold air blown into the refrigerator compartment duct 25 by the cooling fan 19 to the refrigerator compartment 18 and controlling the refrigerator compartment 18 to a set temperature.

Only the portions of the electric circuit diagram relevant to the gist of the present invention are shown, and reference numeral 46 denotes C as time control means.
The PU operates according to a program stored in a storage circuit (not shown) as is well known. The PU 47 is operated by a clock circuit 45 for outputting the current time, an output signal from the room temperature detecting means 40 and an internal temperature detecting circuit 44. , 49, 51,
The energization control of 53 and 59 is performed. That is, each relay 47, 4
Each transistor 48, 5 connected to 9, 51, 53
By providing a high level signal to the bases 0, 52, 54, 60, each relay 47, 49, 51, 53, 59
Is energized.

When the relay 47 is energized, the compressor 4
Drives. When the relay 49 is energized, the three-way solenoid valve 6 operates to communicate with the second outlet 6b, and when the relay 49 is not energized, the first outlet 6a communicates. Relay
When the power is supplied to 51, the cooling fan 19 operates. Relay
When 53 is energized, the air passage switching means 34 closes the air passage A37 (34b), and when the relay 53 is not energized, closes the air passage B39 (34a). When the relay 59 is energized, the cooler 8 is defrosted by the heater 58.

The internal temperature detection circuit 44 outputs a signal to the time control means 46 when the value detected by the temperature sensor 43 is equal to or higher than the set temperature. Further, the room temperature detecting means 40
The signal from the room temperature sensor 41 is A /
The output voltage is digitized by the D converter 42 and a signal is output to the time control means 46. Also, the heat storage temperature detecting means 5
6 outputs a signal to the time control means 46 when the value detected by the heat storage material temperature sensor 57 is equal to or higher than the set temperature.

In FIG. 2, reference numeral 4 denotes a compressor, which is connected to a three-way solenoid valve 6 via a condenser 5. Further, a first outlet 6a of the three-way solenoid valve 6 is connected to the compressor 4 via a capillary 7, a cooler 8, and an accumulator 13 in this order. The second outlet 6b of the three-way solenoid valve 6 is connected to the accumulator 13 via the heat storage capillary 9 and the heat storage 31 in which the heat storage material 15 is filled.

FIG. 1 shows a refrigerator constructed as described above.
The operation will be described with reference to FIGS. 2, 3, 4, and 5.

In the normal cooling operation, the inside of the refrigerator is cooled by using the cooler 8 and kept at a set temperature. That is, CPU4
6, the relays 51 and 53 are turned off, so that the refrigerant flow path is connected to the cooler 8 (step S1), and the cool air path is switched by the air path switching means 34 to the 34a side (step S1).
2), the air passage A is kept in the communicating state, and when the internal temperature is equal to or higher than the set value, the CPU 46 turns on the relays 47 and 49 by a signal from the internal temperature detecting circuit 44 to turn on the relay 4 and the cooling fan. 19 (Step S)
3) The cooler 8 cools the inside of the refrigerator to a set temperature or lower. When the internal temperature falls below the set value, the signal of the internal temperature detecting circuit 44 is turned off, and the CPU 46 sets the relay mode.
47 and 49 are turned off to stop the circulation of the refrigerant and the cool air (step S4). By repeating the above operation, the inside of the refrigerator is kept cool to the set temperature.

In the heat storage operation, during a predetermined time period during which nighttime power demand is low (from 23:00 to 7:00 the next day) (step S5), the heat storage material 32 filled in the heat storage device 31 is stored in the heat storage material 32 during the night. The electric power in the time zone is stored instead of heat. That is, when the internal temperature is equal to or higher than the set value, the CPU 46 performs a normal operation of turning on the relays 47 and 49 and operating the compressor 4 and the cooling fan 19 according to a signal from the internal temperature detecting circuit 44 (step S6). When the internal temperature is equal to or less than the set value, the relay 46 is turned on by the CPU 46 from the signal from the internal temperature detection circuit 44 to hold the refrigerant flow path on the side where the heat accumulator 31 communicates, By operating the compressor 4, the refrigerant is evaporated in the heat storage device 31, and the heat storage material 32 is frozen (step S7).

The weight of the heat storage material 32 is as follows:
The weight is set based on the room in the refrigerated temperature zone at the time of low room temperature (15 ° C.) in autumn or the like. That is, the weight is such that all the heat amount equivalent to the total load heat amount of the refrigerating compartment in a predetermined time zone (from 7:00 to 23:00) when the power demand in the daytime is high at the low room temperature can be stored.

In the heat storage cooling operation, the heat stored in the heat storage unit 31 is used during the peak power demand in the daytime to cool the return air in a room other than the freezing room. That is, when the freezing room temperature is equal to or higher than the set value, the CPU 46 turns on the relays 47 and 49 and operates the compressor 4 and the cooling fan 19 according to a signal from the internal temperature detecting circuit 44 to lower the freezing room below the set temperature. Cool. The temperature of the refrigerating compartment 18 is controlled to a set temperature by adjusting the amount of air blown to the refrigerating compartment 18 by the damper 26, and the return air is supplied to the CPU 46.
By turning on the relay 53, the air path switching means 34 becomes the 34b side of the cool air path, and the air blowing path B39 is maintained in the communicating state to cool (step S8). Thus, the amount of heat to be cooled by the cooler 8 is only the amount of heat applied to the freezing compartment.

When the internal temperature falls below the set value, the signal of the internal temperature detecting circuit 44 is turned off and the CPU 46
Turns off the relays 47 and 49 and stops the circulation of the compressor and the cool air. By repeating the above operation, the inside of each refrigerator is kept at the set temperature.

Next, a control method of each operation will be described with reference to FIGS. The defrosting of the cooler 8 is always performed by the time control means 46 from 23:00, which is the beginning of a predetermined time zone during which nighttime power demand is low (from 23:00 to 7:00 the next day) (step S9). Moisture in the refrigerator compartment 18 during the heat storage cooling operation in the daytime forms frost in the heat storage device 31, so that the amount of frost formed in the cooler 8 can be reduced and defrosting can be performed once a day. Then, after the completion of the defrosting, the alternating operation of the normal cooling operation and the heat storage operation is performed. That is, when the temperature in the refrigerator is equal to or higher than the set value, the inside of the refrigerator is cooled by the normal cooling operation, and when the temperature in the refrigerator is equal to or lower than the set value, the heat storage operation is performed to store the heat instead of the electric power.

However, the time of the heat storage operation at that time varies depending on the room temperature. This is because the amount of heat entering from the cabinet 2 and the refrigeration capacity of the system change depending on the room temperature, and the heat storage operation time is shorter at a lower room temperature. Therefore, the end of freezing of the heat storage material 32 is detected by the heat storage temperature detecting means 56, and the heat storage operation ends (step S10).

The daytime load is estimated by the time control means 46 from the average daytime room temperature of the day before detected by the room temperature detection means 40.

From this estimated value, the time control means 46 determines that at least the daytime power demand is in the peak time zone (13:00 from 13:00).
6:00) is started (step S11). Then, the heat storage temperature detecting means 56
Is sent to the time control means 46, indicating that the cooling capacity of the heat accumulator 31 has been lost due to the temperature exceeding the set temperature.

For example, as shown in FIG. 5, the time of the heat storage cooling operation is 8 hours when the room temperature is 30 ° C., and 16 hours when the room temperature is 15 ° C.

Next, a refrigerator according to another embodiment will be described with reference to the drawings. FIG. 6 is a flowchart according to another embodiment of the present invention, and FIG. 7 is a diagram illustrating a one-day operation state according to room temperature in another embodiment of the present invention.

During a predetermined time period during which the nighttime power demand is low (from 23:00 to 7:00 on the following day), the time control means 46 alternately operates the normal cooling operation and the heat storage operation. That is, when the inside temperature is equal to or higher than the set value, the inside is cooled by the normal cooling operation (step S12), and when the inside temperature is equal to or lower than the set value, heat is stored instead of heat by the heat storage operation (step S13). ) Perform control.

After the end of the heat storage operation in which the end of freezing of the heat storage material 32 is detected by the heat storage temperature detecting means 56, the cooling device 8 is always defrosted (step S14).

As described above, according to the present embodiment, a refrigerating cycle in which a cooler and a heat accumulator having a heat accumulating material therein are connected in parallel, and a heat accumulating operation for accumulating heat in the heat accumulator at an arbitrary time zone. Time control means for performing time control of a heat storage and cooling operation for cooling the refrigerator with the stored heat, wherein the weight of the heat storage material is other than a freezer compartment in a predetermined time zone where power demand in the daytime is high at low room temperature. The amount of heat equivalent to the total load heat of the room is assumed to be the weight that can be stored, and the target load heat of the heat storage / cooling operation is all the rooms other than the freezing room, so that the heat storage material having a large latent heat of fusion can be used, and the effective contents of the refrigerator The reduction of the product is suppressed as much as possible, and the power consumption does not increase.

Further, a heat storage temperature detecting means for detecting the temperature of the heat storage material and a heater for defrosting the cooler are provided, and the time control means controls the cooler at the beginning of a predetermined time period during which nighttime power demand is low. The defrosting is performed, and after completion of the defrosting, the compressor is continuously operated until the end of the heat storage of the heat storage material is detected by the heat storage temperature detecting means, and heat is stored by the heat storage operation for all times other than the normal cooling operation. The heat storage / cooling operation is started so that the cooling operation time period includes at least a daytime power demand peak time period, and the heat storage temperature detecting means detects that the cooling capacity of the heat storage device has run out. Since the heat storage / cooling operation is completed, the defrosting start time of the cooler is performed at the beginning of the night when the power demand is low regardless of the customer's use condition, so that the power demand is leveled and the power is effectively used. It can, also can ensure the refrigerating capacity can be defrosted reliably cooler at night.

Further, the compressor is continuously operated until the heat storage temperature detecting means detects the end of the heat storage of the heat storage material from a predetermined time zone in which the nighttime power demand is low by the time control means, and the time other than the normal cooling operation is set. Since all heat is stored by the heat storage operation and the defrosting of the cooler is performed after the heat storage operation is completed, the start time of the defrosting of the cooler is performed after the nighttime heat storage operation where the power demand is small, regardless of the usage condition of the customer. Leveling demand, and effectively using electricity.
In addition, the heat storage material can be reliably frozen during the night.

[0050]

As described above, the present invention provides a refrigeration cycle in which a cooler and a heat accumulator having a heat accumulating material therein are connected in parallel, a heat accumulating operation for accumulating heat in the heat accumulator at any time, and a heat accumulating operation. Time control means for controlling the time of the heat storage cooling operation for cooling the inside of the refrigerator by the generated heat, wherein the weight of the heat storage material is a room other than the freezer room in a predetermined time zone in which daytime power demand is high at low room temperature. The heat load equivalent to the sum of the load heat amounts is the weight that can be stored, and the load heat amounts to be subjected to the heat storage cooling operation are all the rooms other than the freezing room.

Further, a heat storage temperature detecting means for detecting the temperature of the heat storage material and a heater for defrosting the cooler are provided, and the time control means is used to start the cooler at the beginning of a predetermined time period during which nighttime power demand is low. The defrosting is performed, and after completion of the defrosting, the compressor is continuously operated until the end of the heat storage of the heat storage material is detected by the heat storage temperature detecting means, and heat is stored by the heat storage operation for all times other than the normal cooling operation. The heat storage / cooling operation is started so that the cooling operation time period includes at least a daytime power demand peak time period, and the heat storage temperature detecting means detects that the cooling capacity of the heat storage device has run out. The heat storage cooling operation ends.

Further, there is provided a heat storage temperature detecting means for detecting the temperature of the heat storage material and a heater for defrosting the cooler, and the heat control temperature detecting means is provided by a time control means from a predetermined time period during which nighttime power demand is low. The compressor is continuously operated until the end of the heat storage of the heat storage material is detected, and heat is stored by the heat storage operation for all times other than the normal cooling operation, and the cooler is defrosted after the heat storage operation is completed. The heat storage / cooling operation is started so that at least the daytime power demand includes a peak time period, and the heat storage / cooling operation is performed by detecting that the cooling capacity of the heat storage device is lost by the heat storage temperature detecting means. Since the operation is terminated, a heat storage material having a large amount of latent heat of fusion can be used, the decrease in the effective internal volume of the refrigerator can be suppressed as much as possible, and the power consumption does not increase.

Further, since the defrosting start time of the cooler is performed at the beginning of the night when the power demand is small irrespective of the use condition of the customer, the power demand can be leveled and the power can be effectively used.

Furthermore, since the defrosting start time of the cooler is performed after the nighttime heat storage operation, when the power demand is small, irrespective of the use condition of the customer, the power demand can be leveled and the power can be effectively used, and the power can be reliably used during the night. It becomes a refrigerator that can freeze the heat storage material.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the structure of a refrigerator in one embodiment of the present invention.

FIG. 2 is a refrigeration system diagram of the refrigerator of FIG. 1;

FIG. 3 is an electric circuit diagram of a main part of the refrigerator of FIG. 1;

FIG. 4 is a flowchart of an embodiment.

FIG. 5 is an operation state diagram of one day according to the room temperature in FIG. 1;

FIG. 6 is a flowchart of another embodiment.

FIG. 7 is a diagram showing a daily operation state according to room temperature in another embodiment.

FIG. 8 is a longitudinal sectional view showing the structure of a conventional refrigerator.

FIG. 9 is a refrigeration system diagram of the refrigerator of FIG. 8;

[Explanation of symbols]

 Reference Signs List 8 cooler 31 heat storage device 32 heat storage material 46 time control means 56 heat storage temperature detection means 58 heater

Claims (3)

(57) [Claims] 1. A refrigerating cycle in which a cooler and a heat accumulator having a heat accumulating material therein are connected in parallel, a heat accumulating operation for accumulating heat in the heat accumulator in an arbitrary time zone, and cooling the inside of the refrigerator by the accumulated heat. and a time control means for time control of the energy storage and cooling operation, the melting temperature of the heat storage material, and higher than the freezing room temperature temperature, weight of the heat storage material, the peripheral of the refrigerator
Lower than ambient temperature in summer in annual change of ambient temperature
In the storage room in the refrigerator in the predetermined time period when the power demand in the daytime is large at the ambient temperature , the amount of heat equivalent to the total load heat amount of the storage room in the storage room in the refrigeration temperature zone is a weight capable of storing all heat, and the heat storage cooling operation is performed. The target load heat quantity is the refrigerated
A refrigerator characterized by a total load calorie of a storage room in a refrigeration temperature zone in a storage room in a refrigerator. 2. A heat storage temperature detecting means for detecting the temperature of a heat storage material and a heater for defrosting the cooler, wherein the time control means starts the cooler at the beginning of a predetermined time zone in which nighttime power demand is low. The defrosting is performed, and after completion of the defrosting, the compressor is continuously operated until the end of the heat storage of the heat storage material is detected by the heat storage temperature detecting means, and heat is stored by the heat storage operation for all times other than the normal cooling operation. The heat storage / cooling operation is started so that the cooling operation time period includes at least a daytime power demand peak time period, and the heat storage temperature detecting means detects that the cooling capacity of the heat storage device has run out. The refrigerator according to claim 1, wherein the heat storage cooling operation is terminated. 3. A heat storage temperature detecting means for detecting a temperature of a heat storage material and a heater for defrosting a cooler, wherein the time control means starts the heat storage temperature detecting means from a predetermined time zone during which nighttime power demand is low. The compressor is continuously operated until the end of the heat storage of the heat storage material is detected, and heat is stored by the heat storage operation for all times other than the normal cooling operation, and the cooler is defrosted after the heat storage operation is completed. The heat storage / cooling operation is started so that at least the daytime power demand includes a peak time period, and the heat storage / cooling operation is performed by detecting that the cooling capacity of the heat storage device is lost by the heat storage temperature detecting means. The refrigerator according to claim 1, wherein the operation is terminated.