JPH11257694A - Ice cold storage method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably perform ice cold storage by using simple device constitution, and by immediately solving a problem being caused by releasing a supercooling state even in the case when releasing of the supercooling state is generated in a supercooling water channel. SOLUTION: In an ice cold storage method, cooling liquid 2 is circulated for supplying to a supercooler 6 and is subjected to heat exchange with water 4, the water 4 is supercooled to 0 deg. or lower, the supercooling state of the cooled water 4 is released and is subjected to phase change into ice, and cold storage is made. When the supercooling state is released in the supercooler 6, and ice is generated in the supercooler 6, a heated liquid 2' where the cooling liquid 2 is heated in supplied to the supercooler 6 for melting the ice in the supercooler 6 in place of the cooling liquid 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for storing ice cold, and more particularly, to ice generated in a supercooled water passage when a supercooled state is released in the supercooled water passage. The present invention relates to an ice cold storage method and apparatus which can immediately melt ice and continuously perform ice cold storage.

[0002]

2. Description of the Related Art There is an ice regenerator that uses the cold heat of ice to perform cold storage.

As shown in FIG. 3, the above ice regenerator has a refrigerator 3 in which a cooling liquid 2 is circulated through a cooling liquid circulation flow path 1 comprising a supply flow path 1a and a return flow path 1b. And a supercooler 6 that cools the water 4 to zero degrees Celsius or less by the cooling liquid 2 supplied from the refrigerator 3 by the pump 3a to be supercooled water 5, and is dropped after exiting the supercooler 6. The supercooled water 5 is received by the surface of the water 4 stored therein or by a collision plate (not shown) provided inside, so that the supercooled state is forcibly released by using an impact force to generate ice 7. The refrigeration tank 8 is configured to accumulate cold heat in the state of ice 7, and the water 4 in the regenerator 8 is circulated using a circulation pump 9, and is sprayed from a spray nozzle 10 to melt the ice 7. Through the spray channel 11 and the cold / hot extraction channel 12 Heat exchange medium 13 between the cold storage tank 8
Heat is exchanged with the water 4 in the cool storage tank 8 by circulating the heat, and heat utilization equipment 14 such as an air conditioner of a building in which the cold heat obtained by the heat exchange medium 13 is used for air conditioning and the like.
A water pump 16 takes out the water 4 from the cold storage tank 8 through the water supply channel 15 and sends the water 4 to the supercooler 6 again.

Further, a strainer 17 and a filter 18 for removing dust and particles of ice 7 which adversely affect the supercooled state are provided in the middle of the water supply passage 15 in the ice regenerator. A temperature controller 20 having a heater and a cooler for adjusting the temperature of water supplied from the water supply channel 15 to the subcooler 6 through a heat exchanger.
Are provided as appropriate.

[0005] The supercooler 6 basically includes a supercooled water flow path 21 through which the supercooled water 5 flows, and a supercooled water flow path 2.
1 and a cooling liquid flow path 22 for cooling the supercooled water 5 flowing in the supercooled water flow path 21.

A typical ice storage / cooling device is provided with a plurality of subcoolers 6 as shown in FIG. In the example of FIG. 3, three subcoolers 6 are provided.
The water 4 from the water supply channel 15 is branched and supplied to the supercooled water channel 21. Further, three refrigerators 3 are provided corresponding to the subcoolers 6, and each refrigerator 3 is provided in the cooling liquid flow path 22 of the corresponding subcooler 6.
The cooling liquid is circulated through the cooling liquid circulation channel 1.

In the supercooler 6, for example, as shown in FIG. 4, the supercooled water flow path 21 is a single water pipe 23, and the cooling liquid flow path 22 is an outer pipe 24 surrounding the water pipe 23. As shown in FIG. 5, a supercooled water passage 2
1 is a shell-and-tube type in which a plurality of water guide pipes 25 and an outer shell 26 surrounding the plurality of water guide pipes 25 at the same time, and as shown in FIG. There is a gutter type in which the passage 21 is a water guiding gutter 27 and the cooling liquid flow path 22 is a cooling liquid jacket 28 in which the water guiding gutter 27 is placed above.

[0008] Further, as shown in FIG.
A condenser 31 for condensing a vapor 29 of a first cooling liquid (refrigerant) such as an alternative Freon with cooling water 30 or the like;
Liquid 3 of first cooling liquid condensed and liquefied in condenser 31
The evaporator 33 heat-exchanges the cooling liquid 2 to be sent to the subcooler 6 with the cooling liquid 2 to be sent to the subcooler 6, and the first evaporator 33 generates heat by heat exchange in the evaporator 33. Compressor 3 that compresses cooling liquid vapor 29 and sends it to condenser 31
4 is generally used. In the drawing, reference numeral 36 denotes a pump.

As shown in FIG. 8, the refrigerator 3 includes a condenser 31 for condensing a vapor 29 of a first cooling liquid (refrigerant) such as an alternative Freon with cooling water 30 and the like. An evaporator 33 for exchanging heat between the condensed and liquefied first cooling liquid liquid 32 and the second cooling liquid 37, and compresses the first cooling liquid vapor 29 generated by the heat exchange in the evaporator 33. And the cooling liquid 2 sent to the condenser 31 and the cooling liquid 2 sent to the subcooler 6.
And an intermediate heat exchanger 39 for exchanging heat with the indirect cooling system. In the figure, reference numeral 40 denotes a pump.

Alternatively, as shown in FIG. 9, the refrigerator 3 does not include the evaporator 33 and uses the cooling liquid flow path 22 of the subcooler 6 instead of the evaporator 33 to provide a subcooler. 6
A direct cooling type in which the cooling liquid 2 is evaporated in the cooling liquid flow path 22 and the water 4 is converted into the supercooled water 5 by utilizing the latent heat of evaporation is currently being developed. The direct cooling type has an advantage that the intermediate cooling liquid is not required and the refrigerator 3 can be downsized.

In the ice regenerator having such a configuration, each refrigerator 3
For example, the cooling liquid 2 cooled to -6 ° C to -10 ° C
Is supplied to the cooling liquid flow path 22 of each subcooler 6 through the supply side flow path 1a of the cooling liquid circulation flow path 1,
The cooling liquid 2 used in the cooling liquid flow path 22 is returned to the refrigerator 3 via the return-side flow path 1b of the cooling liquid circulation flow path 1, and thereafter the above-described circulation is repeated.

At the same time, the water 4 in the cold storage tank 8 is
And is sent to the supercooled water flow path 21 of the subcooler 6 through the water supply flow path 15, and on the way, the strainer 17 and the filter 18 adversely affect the supercooled state, such as dust and particles of ice 7. The fine particles of the ice 7 which cannot be removed by the strainer 17 or the filter 18 are eliminated by heating by the heat exchanger 19 provided with the temperature controller 20 and the temperature of the water 4 is reduced by 0.3 at this time. ℃ ~ 0.
Adjusted to 5 ° C.

The water 4 sent to the supercooled water flow path 21 of the subcooler 6 is cooled by the cooling liquid 2 sent from the refrigerator 3 to the cooling liquid flow path 22 of the subcooler 6. The supercooled water 5 is cooled to about 2 ° C.

Supercooled water 5 cooled to a temperature below zero degree Celsius
Is extremely unstable, and the supercooled water 5
It is in a state where a phase change easily occurs to the ice phase, which is the minimum value of energy.

Therefore, the supercooled water 5 cooled in the supercooled water passage 21 of the supercooler 6 is dropped into the cold storage tank 8 and provided on the surface or inside of the water 4 stored in the cold storage tank 8. By colliding with a collision plate (not shown), the supercooled state of the supercooled water 5 is forcibly released by the impact force, and ice 7 is generated.

As described above, by storing the cold heat in the state of the ice 7, compared with the case of storing the cold in the water state,
It is possible to obtain a larger cold storage capacity in the cold storage tank 8 having a small volume.

The ice 7 in the regenerator 8 is stored as it is until there is a demand. When the ice 7 is in demand, the water 4 in the regenerator 8 is supplied to the circulation pump 9 and the spray channel. The ice 7 is melted by being sprayed from the spray nozzle 10 toward the ice 7 through the heat exchange medium 11, and the heat of melting at this time cools the heat exchange medium 13 flowing through the cold heat extraction channel 12, and the cooled heat The exchange medium 13 is sent to a heat utilization facility 14 such as an air conditioning facility of a building to be used for air conditioning or the like.

On the other hand, as described above, the energy state of the supercooled water 5 cooled to zero degrees Celsius or less is extremely unstable, and the supercooled water 5 undergoes a phase change to an ice phase, which is a minimum value of energy. If the supercooling water flow path 21 of the supercooler 6 through which the supercooling water 5 passes has irregularities, scratches, dirt, and the like, the supercooling water 5 stays in the irregularities, scratches, dirt, and the like. Or turbulence, or the heat transfer area of parts such as irregularities or scratches is larger than other parts, and the cooling effect is larger than other parts. There is a case where the supercooled state of the supercooled water 5 is released.

As described above, once the supercooled water 5 is released from the supercooled state inside the supercooled water flow path 21, the inside of the supercooled water flow path 21 is blocked by the ice. Until the ice disappears from the inside, the equipment becomes unusable.

Therefore, conventionally, the inner surface of the supercooled water passage 21 is polished by buffing, electrolytic polishing, or the like to remove irregularities, scratches, dirt, and the like on the inner surface of the supercooled water passage 21 and to remove the inner surface of the supercooled water passage 21. To prevent the supercooled water 5 from being released in a supercooled state, or to arrange a warm water jacket or heater around the supercooler 6 to heat the supercooler 6, In this case, the supercooled water flow path 21 is opened by, for example, heating so that the temperature of the supercooled water flow path 21 becomes zero degree or more, so that the ice in the supercooled water flow path 21 closed with ice disappears.

[0021]

However, the above-mentioned conventional subcooler has the following problems.

That is, when polishing such as buffing or electrolytic polishing is performed on the inner surface of the supercooled water flow path 21, for example, the supercooled water flow path 21 may be long or small in diameter.
Depending on the length and diameter of the supercooled water flow path 21, polishing may not be possible, and there may be problems such as the need for labor, time, and cost in the polishing process. Further, the polishing process may cause unevenness. Therefore, even if polishing is performed, it is not possible to reliably prevent the supercooled water 5 from being released from the supercooled state in the supercooled water flow path 21.

In the case of a heating method in which a warm water jacket or a heater is arranged around the subcooler 6 or heating is performed so that the cooling liquid 2 has a temperature of zero degree or more, the supercooling water flow path 2
There is a problem in that it takes time until the ice that blocks the inside of the device 1 is eliminated, and the time for suspending the operation of the ice regenerator becomes long.

As a method for solving such a problem, a plurality of subcoolers 6 and a refrigerator 3 are provided as shown in FIG. In the case where clogging occurs due to the formation of ice in the subcooler 6, the set temperature of the cooling liquid 2 supplied from the refrigerator 3 to another subcooler 6 is adjusted to increase the temperature. The operation of the subcooler 6 is ensured to continue. However, this method has a problem that the device configuration is complicated and equipment cost is increased.

In view of the above-mentioned circumstances, the present invention can solve the problem of releasing the supercooled state immediately with a simple device configuration even when the supercooled state is released in the supercooled water flow path, It is an object of the present invention to provide an ice refrigerating method and an apparatus capable of performing the above-mentioned ice refrigerating.

[0026]

According to a first aspect of the present invention, a cooling liquid is circulated and supplied to a subcooler to exchange heat with water, whereby the water is supercooled to zero or less, and the supercooled water is cooled. An ice cold storage method in which ice is stored by changing the phase to ice by releasing the cooling state, and ice is generated in the supercooler when the supercooling state is released in the subcooler. An ice refrigerating method characterized by melting ice in a subcooler by supplying a heating liquid obtained by heating a cooling liquid to a supercooler instead of the cooling liquid when the cooling liquid is used. is there.

According to a second aspect of the present invention, there is provided a subcooler having a supercooled water flow path and a cooling liquid flow path, a water supply flow path for supplying water to the supercooled water flow path of the subcooler, A cooling liquid circulating flow path for circulating and supplying cooling liquid from the refrigerator to the cooling liquid flow path of the subcooler through a supply-side flow path and a return-side flow path to subcool the water to zero degrees or less; An ice regenerator having a regenerator which releases a supercooled state of water cooled through a supercooled water flow path of a vessel to change into a phase of ice to perform ice storage. A heating liquid tank for heating the cooling liquid by the heater and containing the heating liquid, and supplying the heating liquid in the heating liquid tank to the cooling liquid flow path of the supercooler instead of the cooling liquid. The heating liquid supply flow path to be obtained and the heating liquid supplied to the cooling liquid flow path of the supercooler are switched back to the heating liquid tank. Ice cold storage device being characterized in that a potential warming liquid return side channel, but according to the.

According to a third aspect of the present invention, there is provided a subcooler having a supercooled water flow path and a cooling liquid flow path, a water supply flow path for supplying water to the supercooled water flow path of the subcooler, A cooling liquid circulating flow path for circulating and supplying cooling liquid from the refrigerator to the cooling liquid flow path of the subcooler through a supply-side flow path and a return-side flow path to subcool the water to zero degrees or less; An ice regenerator having a regenerator which releases a supercooled state of water cooled through a supercooled water flow path of a vessel to change into a phase of ice to perform ice storage. A cooling liquid is heated by a heater, the heated liquid is stored in the heated liquid tank, and the heated liquid is placed in the upper part of the supercooler. The heated liquid in the heated liquid tank is replaced with the cooling liquid. An ice cold storage device, comprising: a falling supply channel capable of supplying the cooling liquid channel of the cooler. .

According to the above means, the following effects can be obtained.

When ice is generated in the subcooler due to the release of the supercooled state in the subcooler and blockage occurs, the heating liquid obtained by heating the cooling liquid is superposed instead of the cooling liquid. Since the ice in the subcooler is melted by supplying the ice to the cooler, the ice generated in the supercooler can be immediately eliminated to release the blockage, and the ice cold storage operation can be continued.

Furthermore, the release of the blockage can be reliably performed by a simple device configuration.

Further, if the heating liquid tank is provided at a high position and the heating liquid in the heating liquid tank is supplied to the cooling liquid flow path by gravity, the structure of the apparatus can be further simplified.

[0033]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic system diagram showing an example of the embodiment of the present invention. For the basic configuration of the ice regenerator,
3 to 9, the same parts are denoted by the same reference numerals and description thereof will be omitted.

As shown in FIG. 1, a heating liquid tank 41 is provided, in which the cooling liquid 2 supplied from the refrigerator 3 to the supercooler 6 is temporarily stored. A part of the cooling liquid 2 in the liquid storage tank 42 provided as described above can be supplied and stored by a supply pipe 44 provided with a supply pump 43.

A heating device 45 is provided in the heating liquid tank 41, and the cooling liquid 2 is heated by the heating device 45 to raise the temperature to normal temperature or a predetermined temperature higher than normal temperature. The heated liquid 2 ′ can be always stored in the heated liquid tank 41.

Further, the heating liquid 2 ′ stored in the heating liquid tank 41 is supplied to the heating liquid tank 41 by a supply pump 46.
One end of a heating liquid supply flow path 47 which is taken out through the cooling liquid circulation flow path 1 is connected to one end of the heating liquid supply flow path 47. It is connected via a switching device 48 such as a switching valve. Also,
One end of a heated liquid return flow path 49 is connected to the heated liquid tank 41, and the other end of the heated liquid return flow path 49 is
The cooling liquid circulation flow path 1 is connected to the return flow path 1b via a switching device 50 such as a three-way switching valve.

Further, a flow meter 51 and a pressure gauge 52 are provided in the water supply channel 15 for supplying the water 4 to the subcooler 6.

Next, the operation of the apparatus shown in FIG. 1 will be described.

FIG. 3 shows the basic operation of the ice regenerator.
9 to FIG. 9, and the description is omitted.

During the operation of the ice regenerator, the supercooled state of the supercooled water 5 is released inside the supercooled water passage 21 due to irregularities, scratches, dirt, and the like on the inner surface of the supercooled water passage 21 of the supercooler 6. When ice is generated in the cooling water flow path 21, the flow of the water 4 in the supercooling water flow path 21 is deteriorated, and blockage occurs.
When the blockage occurs, the detection flow rate of the flow meter 51 provided in the water supply flow path 15 rapidly decreases, and the detection pressure of the pressure gauge 52 sharply increases. it can.

When the blockage of the supercooled water passage 21 is detected,
By switching the switching devices 48 and 50 manually or automatically, the heating liquid supply passage 47 and the heating liquid return passage 49 communicate with the cooling liquid passage 22 to operate the supply pump 46. Then, the heating liquid 2 ′ in the heating liquid tank 41 is supplied to the cooling liquid flow path 22 via the heating liquid supply flow path 47, and after flowing through the cooling liquid flow path 22, the heating liquid 2 ′ Circulation is performed so as to return from the return channel 49 to the heated liquid tank 41.

At this time, since the heating liquid 2 ′ has been heated to the normal temperature or a predetermined temperature higher than the normal temperature as described above, the heating liquid 2 ′ flows in the cooling liquid flow path 22. As a result, the cooling liquid flow path 22 is warmed, whereby the ice generated in the supercooled water flow path 21 melts and disappears immediately, so that the blockage of the cooling liquid flow path 22 is released and the ice cold storage operation is continued. Can be. When the above-described blockage problem frequently occurs, the temperature of the water 4 supplied to the subcooler 6 is slightly increased, or the temperature of the cooling liquid 2 is slightly increased. By increasing the frequency, the frequency of occurrence of blockage can be reduced.

In the apparatus shown in FIG. 1, the heating liquid supply flow path 47 is connected to the supply side flow path 1a of the cooling liquid circulation flow path 1 via the switching device 48, and the heating liquid return flow path 49 is connected. Is connected to the return side flow path 1b of the cooling liquid circulation flow path 1 via the switching device 50, but the heating liquid supply flow path 47 and the heating liquid return flow path 49 are connected to the cooling liquid flow path 22. By connecting them, an on-off valve may be provided in each of the heated liquid supply channel 47 and the heated liquid return channel 49.

FIG. 2 is a schematic system diagram showing another example of the embodiment of the present invention. Since the basic configuration of the ice regenerator is the same as that of FIG. 1, the same parts are denoted by the same reference numerals and description thereof will be omitted.

As shown in FIG. 2, a heating liquid tank 53 is provided at a position sufficiently higher than the position where the supercooler 6 is provided. A part of the cooling liquid 2 in the liquid storage tank 42 is supplied and stored in the heating liquid tank 53 in the same manner as in the apparatus of FIG. A warmer 45 is provided, and by heating the cooling liquid 2, the warming liquid 2 ′, which has been heated to a normal temperature or a predetermined temperature higher than the normal temperature, is always stored.

Further, the heating liquid tank 53 is connected to one end of a heating liquid supply channel 54 for taking out the heating liquid 2 ′ stored in the heating liquid tank 53. The other end of the heating liquid supply flow path 54 is connected to the supply side flow path 1a of the cooling liquid circulation flow path 1 via a switching device 55 such as a three-way switching valve. In the heating liquid supply channel 54,
The supply pump 46 in the apparatus of FIG. 1 is not provided.

Next, the operation of the apparatus shown in FIG. 2 will be described.

FIG. 3 shows the basic operation of the ice regenerator.
9 to FIG. 9, and the description is omitted.

During operation of the ice regenerator, the supercooled state of the supercooled water 5 is released inside the supercooled water channel 21 due to irregularities, scratches, dirt, etc. on the inner surface of the supercooled water channel 21 of the supercooler 6. When ice is generated in the cooling water flow path 21, the flow of the water 4 in the supercooling water flow path 21 is deteriorated, and blockage occurs.
When the blockage occurs, the detection flow rate of the flow meter 51 provided in the water supply flow path 15 rapidly decreases, and the detection pressure of the pressure gauge 52 sharply increases. it can.

When the blockage of the supercooled water passage 21 is detected,
The switching device 55 is switched so that the heating liquid supply passage 54 communicates with the cooling liquid passage 22. Then, the heating liquid 2 ′ in the heating liquid tank 53 is supplied to the cooling liquid flow path 22 via the heating liquid supply flow path 54, and after flowing through the cooling liquid flow path 22, the cooling liquid circulation flow It flows so as to return to the refrigerator 3 via the return side flow path 1b of the path 1.

At this time, since the heating liquid 2 ′ has been heated to the normal temperature or a predetermined temperature higher than the normal temperature as described above, the heating liquid 2 ′ flows in the cooling liquid flow path 22. As a result, the cooling liquid flow path 22 is warmed, whereby the ice generated in the supercooled water flow path 21 melts and disappears immediately, so that the blockage of the cooling liquid flow path 22 is released and the ice cold storage operation is continued. Can be.

In the apparatus shown in FIG. 2, the heating liquid tank 53 is provided at a high position, and the heating liquid 2 'in the heating liquid tank 53 is supplied to the cooling liquid flow path 22 by gravity. The device configuration can be simplified.

In the apparatus shown in FIG. 2, the case where the heating liquid supply passage 54 is connected to the supply-side passage 1a of the cooling liquid circulation passage 1 via the switching device 55 has been exemplified.
The heating liquid supply passage 54 may be connected to the cooling liquid passage 22 and an on-off valve may be provided in the heating liquid supply passage 54.

It should be noted that the present invention is not limited to only the above-described embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

[0056]

As described above, according to the first to third aspects of the present invention, when the supercooled state is released in the subcooler, ice is generated in the subcooler and blockage occurs. In this case, instead of the cooling liquid, the heating liquid obtained by heating the cooling liquid is supplied to the supercooler to melt the ice in the supercooler, so that the ice generated in the supercooler is removed. There is an effect that the ice cold storage operation can be immediately performed to release the blockage and the ice cold storage operation can be continued.

Furthermore, the release of the blockage can be reliably performed by a simple device configuration.

According to the third aspect of the present invention, since the heating liquid tank is provided at a high position, the heating liquid in the heating liquid tank is supplied to the cooling liquid flow path by gravity. In addition, the device configuration can be further simplified.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram showing an example of an embodiment of the present invention.

FIG. 2 is a schematic system diagram showing another example of the embodiment of the present invention.

FIG. 3 is a schematic system diagram of a conventional ice cold storage device.

FIG. 4 is a schematic side sectional view showing an example of a conventional subcooler.

FIG. 5 is a schematic side sectional view showing another example of the conventional subcooler.

FIG. 6 is a schematic perspective view showing still another example of the conventional subcooler.

FIG. 7 is a schematic system diagram of an ice regenerator having an indirect cooling type refrigerator.

FIG. 8 is a schematic system diagram of another ice regenerator having an indirect cooling type refrigerator.

FIG. 9 is a schematic system diagram of an ice cold storage device having a direct cooling type refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling liquid circulation flow path 2 Cooling liquid 2 'Warming liquid 3 Refrigerator 4 Water 6 Subcooler 7 Ice 15 Water supply flow path 21 Supercooling water flow path 22 Cooling liquid flow path 41 Heating liquid tank 45 Heating device 47 Heated liquid supply flow path 49 Heated liquid return flow path 53 Heated liquid tank 54 Heated liquid supply flow path

Claims (3)

[Claims] 1. A cooling liquid is circulated and supplied to a supercooler to exchange heat with water, thereby supercooling water to zero or less, and releasing the supercooled state of the cooled water to change the phase to ice. An ice cold storage method for storing ice, wherein when the supercooled state is released in the subcooler and ice is generated in the subcooler, the cooling liquid is replaced with the cooling liquid. An ice refrigerating method characterized by melting ice in a subcooler by supplying a heated liquid to a subcooler. 2. A subcooler having a subcooling water channel and a cooling liquid channel, a water supply channel for supplying water to the supercooling water channel of the subcooler, and a cooling liquid flow of the subcooler. A cooling liquid circulating flow path for circulating and supplying cooling liquid from the refrigerator by a supply-side flow path and a return-side flow path to subcool the water to zero or less, and a subcooling water flow path of the subcooler. An ice regenerator including a regenerator that releases a supercooled state of water cooled through the phase to change the phase of the water into ice and performs ice storage, wherein a cooling liquid is heated by a heater. A heating liquid tank for warming and containing the heating liquid, and a heating liquid supply passage capable of supplying the heating liquid in the heating liquid tank to the cooling liquid passage of the subcooler instead of the cooling liquid A heated liquid return-side flow path switchable to return the heated liquid supplied to the cooling liquid flow path of the supercooler to the heated liquid tank. An ice storage device comprising: 3. A subcooler having a subcooling water channel and a cooling liquid channel, a water supply channel for supplying water to the supercooling water channel of the subcooler, and a cooling liquid flow of the subcooler. A cooling liquid circulating flow path for circulating and supplying cooling liquid from the refrigerator by a supply-side flow path and a return-side flow path to subcool the water to zero or less, and a subcooling water flow path of the subcooler. An ice regenerator including a regenerator that releases a supercooled state of water cooled through the phase to change the phase of the water into ice and performs ice storage, wherein a cooling liquid is heated by a heater. A heating liquid tank that is heated and accommodates the heating liquid and is installed above the subcooler;
An ice regenerator comprising a falling supply channel capable of supplying the heating liquid in the heating liquid tank to the cooling liquid channel of the heating cooler instead of the cooling liquid.