JP4288795B2 - Ice heat storage device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ice heat storage device, and more specifically, to improve the ice making effect by helping to cancel the supercooled state of supercooled water falling from the supercooler to the ice heat storage tank, and further from the upper part of the ice heat storage tank. The present invention relates to an ice heat storage device that improves the cold storage performance by preventing the melting of ice by suppressing the heat input.
[0002]
[Prior art]
An ice heat storage device that performs cold storage using the cold heat of ice has been implemented.
[0003]
As shown in FIG. 4, the ice heat storage device is provided with a low-temperature refrigerant circulation channel 1 including a supply-side channel 1 a and a return-side channel 1 b between the supercooler 6 and the refrigerator 3. The supercooled water 5 is obtained by circulating and supplying the low-temperature refrigerant 2 from the refrigerant to the supercooler 6 by the pump 3a provided in the supply-side flow path 1a and subcooling the water 4 to below zero degrees Celsius.
[0004]
The supercooled water 5 exiting the supercooler 6 is made to collide with a water surface of the water 4 stored inside the ice heat storage tank 8 or a supercooling release device such as a collision plate (not shown) provided inside the ice heat storage tank 8. The ice 7 is generated by forcibly releasing the supercooled state by the impact force.
[0005]
The ice heat storage tank 8 has a spray passage for circulating the water 4 in the ice heat storage tank 8 by using a circulation pump 9 and spraying the water 4 from the spray nozzle 10 to melt the ice 7 and easily take out the cold heat. 11 and the ice heat storage tank 8 through the cold heat extraction flow path 12, the heat exchange medium 13 is circulated to exchange heat with the water 4 inside the ice heat storage tank 8. A water supply flow having a heat utilization facility 14 such as an air conditioning facility of a building that uses the extracted cold energy for air conditioning and the like, and a water pump 16 that takes out the water 4 of the ice heat storage tank 8 and sends it to the supercooler 6 again. Road 15 is provided.
[0006]
In the middle of the water supply channel 15, a strainer 17, a filter 18, and the like are provided for removing dust, ice 7 particles, and the like that are mixed into the water 4 and adversely affect the supercooled state. Further, a temperature controller 20 having a heater and a cooler is connected to the water supply channel 15 via a heat exchanger 19. The temperature regulator 20 is melted so that the water 4 supplied to the subcooler 6 does not contain ice, and is adjusted so that a constant temperature is maintained.
[0007]
The supercooler 6 basically flows in the supercooling water flow path 21 through which the supercooling water flow path 21 flows and the supercooling water flow path 21 through the low temperature refrigerant 2 so as to be in contact with the supercooling water flow path 21. It is constituted by a low-temperature refrigerant flow path 22 for cooling the water 4 to obtain the supercooled water 5.
[0008]
In an ordinary ice heat storage device, for example, as shown in FIG. In the example of FIG. 5, three subcoolers 6 are provided, and the water 4 from the water supply channel 15 is branched and supplied to the subcooling water channel 21 of each subcooler 6. . Further, the low-temperature refrigerant 2 from the refrigerator 3 is circulated corresponding to the supercooler 6. In FIG. 5, H is a heater connected via a three-way valve V to the supply-side flow path 1 a and the return-side flow path 1 b that circulate to the low-temperature refrigerant 2 from each refrigerator 3. The ice heat storage device of FIG. 5 can perform large-capacity ice heat storage compared to the device of FIG.
[0009]
For example, as shown in FIG. 6, the supercooler 6 is a double pipe in which the supercooling water flow path 21 is a single water conduit 23 and the low-temperature refrigerant flow path 22 is an outer tube 24 surrounding the water conduit 23. As shown in FIG. 7, the supercooled water flow path 21 is a plurality of water conduits 25, and the low-temperature refrigerant flow path 22 is an outer shell 26 that simultaneously surrounds the plurality of water conduits 25. As shown in FIG. 8, the supercooled water channel 21 is a water conduit 27 and the low-temperature refrigerant channel 22 is a low-temperature refrigerant jacket 28 in which the water conduit 27 is placed on the top. There are formulas.
[0010]
As shown in FIG. 9, the refrigerator 3 is condensed by a condenser 31 for condensing the vapor 29 of the first low-temperature refrigerant (refrigerant) such as alternative chlorofluorocarbon with cooling water 30, and the condenser 31. The first low-temperature refrigerant liquid 32 liquefied and the low-temperature refrigerant 2 sent to the supercooler 6 are heat-exchanged, and the evaporator 33 for cooling the low-temperature refrigerant 2 sent to the subcooler 6 is heated by the evaporator 33. An indirect cooling system having a compressor 34 that compresses the vapor 29 of the first low-temperature refrigerant generated by the exchange and sends it to the condenser 31 is generally used. In FIG. 9, reference numeral 36 denotes a pump.
[0011]
As shown in FIG. 10, the refrigerator 3 is condensed by a condenser 31 for condensing a vapor 29 of a first low-temperature refrigerant (refrigerant) such as an alternative chlorofluorocarbon with cooling water 30, and the like. The evaporator 33 for exchanging heat between the liquefied first low-temperature refrigerant liquid 32 and the second low-temperature refrigerant 37, and the first low-temperature refrigerant vapor 29 generated by heat exchange in the evaporator 33 are compressed and condensed. It is good also as a thing of the indirect cooling system which has the compressor 34 sent to the apparatus 31, the 2nd low-temperature refrigerant | coolant 37, and the intermediate heat exchanger 38 which heat-exchanges the said low-temperature refrigerant | coolant 2 sent to the supercooler 6. FIG. In FIG. 10, reference numeral 39 denotes a pump.
[0012]
Alternatively, as shown in FIG. 11, the refrigerator 3 does not include the evaporator 33 of FIG. 9, and uses the low-temperature refrigerant flow path 22 of the supercooler 6 instead of the evaporator 33, A direct cooling system in which the low-temperature refrigerant 2 is evaporated in the low-temperature refrigerant flow path 6 and the water 4 is changed to the supercooled water 5 by using the latent heat of evaporation is also being developed. The direct cooling system is advantageous in that an intermediate low-temperature refrigerant is not required and the refrigerator 3 can be downsized.
[0013]
In the ice heat storage device configured as described above, the low-temperature refrigerant 2 that has been lowered to, for example, −6 ° C. to −10 ° C. in the refrigerator 3 of FIGS. The water 4 that is supplied to the low-temperature refrigerant flow paths 22 of the respective subcoolers 6 through the path 1a and flows in the super-cooling water flow paths 21 while flowing through the low-temperature refrigerant flow paths 22 is cooled. 2 is returned to the refrigerator 3 through the return-side flow path 1b of the low-temperature refrigerant circulation flow path 1 and thereafter repeats the above circulation.
[0014]
At the same time, the water 4 in the ice heat storage tank 8 is pumped by the water pump 16 and sent to the supercooling water passage 21 of the supercooler 6 through the water supply passage 15, and along the way, by the strainer 17 and the filter 18. Dust that adversely affects supercooling, particles of ice 7 and the like are removed, or by the temperature controller 20, fine particles of ice 7 that cannot be removed by the strainer 17 and the filter 18 are heated to disappear. At this time, the temperature of the water 4 supplied to the subcooler 6 is adjusted to be a constant temperature of about 0.3 ° C. to 0.5 ° C., for example.
[0015]
The water 4 sent to the supercooling water flow path 21 of the supercooler 6 is cooled to below zero degrees Celsius, for example, about −2 ° C. by the low temperature refrigerant 2 sent from the refrigerator 3 to the low temperature refrigerant flow path 22 of the supercooler 6. Thus, the supercooled water 5 is obtained.
[0016]
The supercooled water 5 cooled to below zero degrees Celsius has an extremely unstable energy state, and the supercooled water 5 is likely to undergo a phase change to an ice phase that is a minimum value of energy.
[0017]
Therefore, the supercooled water 5 subcooled by the supercooler 6 is dropped into the ice heat storage tank 8 and provided in the water surface of the water 4 stored in the ice heat storage tank 8 or inside the ice heat storage tank 8. The supercooling state of the supercooled water 5 is forcibly canceled by the impact force by colliding with a supercooling canceller such as a collision plate (not shown), and ice 7 is generated.
[0018]
In this way, by storing the cold heat in the ice heat storage tank 8 in the state of the ice 7, it is possible to obtain a larger cold storage capacity in the ice heat storage tank 8 having a smaller volume than in the case of cold storage in the water state. It becomes.
[0019]
The ice 7 in the ice heat storage tank 8 is stored as it is until there is a demand, and when demand arises, for example, the water 4 in the ice heat storage tank 8 is supplied to the circulation pump 9 and the spray flow. The ice 7 is melted by spraying from the spray nozzle 10 toward the ice 7 through the passage 11, and the heat exchange medium 13 flowing in the cold heat extraction flow path 12 is cooled by the heat of fusion at this time, and is cooled. The heat exchange medium 13 is sent to a heat utilization facility 14 such as an air conditioning facility in a building and used for air conditioning or the like.
[0020]
Also, the water supercooling phenomenon is unstable, and sometimes the water supercooling state is canceled inside the supercooler 6. In this case, there is a problem that the supercooler 6 is blocked because ice is generated inside the supercooler 6. Therefore, in the practical machine, as shown in FIG. 5, even when a plurality of supercoolers 6 are provided and operated simultaneously, and one of the supercoolers 6 is stopped due to the release of the supercooling, the remaining supercoolers are operated. The device 6 is backed up so that the operation can be continued. At this time, the closed supercooler 6 is heated through the heating fluid from the heater H via the three-way valve V, and the frozen ice 7 is thawed and removed to enable reactivation.
[0021]
On the other hand, as described above, as means for generating the ice 7 by introducing the supercooled water 5 cooled to below zero degrees Celsius in the supercooler 6 to the ice heat storage tank 8 and releasing the supercooled state, Conventionally, various methods have been considered.
[0022]
In order to release the supercooled state of the supercooled water 5, it is effective to give an impact force to the supercooled water 5. For this purpose, for example, as shown in FIG. 4, the supercooling water 5 is dropped from a high position so as to collide with the water 4 in the ice heat storage tank 8, or ultrasonic waves are applied to the falling supercooling water. For example, a method has been adopted in which supercooling water falling from a high position is caused to collide with a supercooling release device such as a collision plate provided inside the ice heat storage tank.
[0023]
[Problems to be solved by the invention]
However, in the conventional method of canceling the supercooling, the method of dropping the supercooled water 5 to collide with the water 4 in the ice heat storage tank 8 cannot increase the impact force so much, and therefore the efficiency of generating the ice 7 However, there is a problem that a high ice-making effect cannot be obtained. In addition, in this way, the method of dropping the supercooled water 5 and relying only on the impact force using the potential energy requires a large drop height, which is disadvantageous for an ice heat storage device having an advantage of compactness. However, there is a problem that the pumping head of the pump for the potential energy must be taken and the operation cost increases.
[0024]
In addition, the cancellation method using ultrasonic waves has a problem that the device becomes complicated and expensive.
[0025]
In addition, in the release method using a supercooling release device such as a collision plate, there is a problem that ice adheres to the collision plate, and further, ice accumulation in the ice heat storage tank depends on the collision angle of the supercooling water against the collision plate. For this reason, there is a need to periodically change the mounting angle of the collision plate, and the structure becomes complicated and expensive. Also, the release method using the collision plate can change the position of the collision plate because the water falling position changes when the amount of supercooled water is changed, or limited to ice making at a constant flow rate. There is a problem that it must be done.
[0026]
On the other hand, in a general supercooling type ice heat storage device, a cover with an opening through which the supercooling water that falls through is installed at the top of the ice heat storage tank, but the ice in the ice heat storage tank is melted. There's a problem. That is, the air on the ice heat storage tank is flowing due to the fall of the supercooling water, and cold air is easily taken from the water surface of the ice heat storage tank due to the flow of air. The main purpose of the ice heat storage device is to make ice using cheap nighttime electricity and cut off the peak of daytime electricity. However, if the generated ice melts, it becomes necessary to follow the operation, leading to an increase in operating cost. Therefore, in an ice storage device, it is important to enhance the ice-making effect and at the same time store the generated ice without melting it to improve the cold storage performance. Not.
[0027]
The present invention has been made to solve the problems of the conventional ice heat storage device, and helps to cancel the supercooling state of the supercooling water falling from the supercooler to the ice heat storage tank, thereby enhancing the ice generation effect. It is another object of the present invention to provide an ice heat storage device capable of maintaining a high ice-making effect and cold storage performance by reducing the heat input from the upper part of the ice heat storage tank and suppressing melting of ice.
[0028]
[Means for Solving the Invention]
The present invention relates to an ice storage tank that receives supercooled water discharged from a supercooler outlet of an ice storage apparatus, and at least the water surface of the ice storage tank covers a floating body that can float freely on the water surface inside the ice storage tank. it was charged to divide, but according to the ice thermal storage apparatus, which is characterized in that so as to release the supercooled water floating body to collide subcooling from subcooler outlet.
[0029]
In the above means, at least the outer surface of the floating body may be made of a non-adhesive material to which ice does not easily adhere.
[0030]
According to the above means, it is possible to exhibit a high ice-making effect and a high cold storage performance with a simple configuration, thereby improving the system efficiency.
[0031]
When the amount of floating body to be introduced is introduced so as to cover at least the water surface of the ice heat storage tank, the ice making effect and the cold storage performance are further enhanced, and at least the outer surface of the floating body is made of a non-adhesive material to which ice hardly adheres. If comprised, the problem that ice adheres to a floating body can be prevented.
[0032]
Moreover, the structure which floated the floating body in the ice heat storage tank can easily cope with the change of the operation state such as the flow rate of the supercooling water.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an embodiment of the present invention. Although FIG. 1 shows a case where a double-tube heat exchanger shape is adopted as the supercooler 6, water 4 is caused to flow down in a supercooled state with a low-temperature refrigerant, and the supercooler 6 is superheated near the water surface of the ice heat storage tank. It can be applied to a supercooler having any structure as long as it can release the cooling. Moreover, although the case where the supercooler 6 is provided by the single machine is shown, it can be similarly applied to the case where a plurality of supercoolers 6 are arranged as shown in FIG.
[0034]
In the embodiment shown in FIGS. 1 and 2, a required floating body 40 that floats on the surface of the water 4 inside the ice heat storage tank 8 and is allowed to move freely is introduced into the ice heat storage tank 8 and supercooled. The supercooled water 5 falling from the outlet of the vessel 6 is made to collide with the floating body 40, and the supercooled state is released by this impact force to make ice.
[0035]
The floating body 40 needs to have a small specific gravity that floats on the water 4 inside the ice heat storage tank 8 and a strength that is not damaged by the collision of the supercooled water 5.
[0036]
As a material of the floating body 40, a non-adhesive material to which ice is difficult to adhere, for example, a polymer material such as acrylic, polyvinyl chloride, and polypropylene can be used. Such a polymer material has significantly lower thermal conductivity than metal, has high heat insulating properties, has a large buoyancy with respect to water, is easy to manufacture, and is low in cost. It is suitable as a material for the floating body 40.
[0037]
The floating body 40 is a hollow spherical body 41a as shown in FIG. 3A, a hollow elliptic body 41b as shown in FIG. 3B, or a solid spherical body as shown in FIG. 3C. 41c. Further, the floating body 40 having a shape as shown in FIGS. 3A to 3C is made of a light material other than the foaming material or the polymer material, and the ice 7 is difficult to adhere to the outer surface. It is good also as what was coat | covered with the coating film of the non-adhesive material which has a paint, Teflon, or a fluorine as a main component.
[0038]
FIG. 3D shows a case where the floating body 40 is made of metal. The metal has a problem of good thermal conductivity, and the generated ice 7 is likely to adhere and grow. Further, since the heat transfer between the ice 7 and the atmosphere is large, the generated ice 7 is easily melted. For this reason, a hollow sphere 42 made of metal is formed, and the outer surface of the hollow sphere 42 is coated with a non-adhesive material 43 mainly composed of paint, which is hard to adhere ice 7, Teflon, or fluorine. ing.
[0039]
On the other hand, FIG. 3E shows a case where a plurality of types of floating bodies 40 having different sizes such as a large diameter body 40a and a small diameter body 40b are mixed and introduced.
[0040]
The floating body 40 may have a polyhedron, a cylinder, a polygonal column, a cone, a polygonal pyramid, or an indefinite shape other than the shapes shown in FIGS. 3 (A) to 3 (E).
[0041]
At this time, if the floating body 40 has a shape in which water accumulates, the water in the pool freezes and adheres, causing ice to grow on the surface of the floating body 40 and agglomeration with the floating body 40 in which other ice has condensed. May form ice blocks. The generation of ice blocks is contrary to the present ice heat storage device that produces sherbet-like ice that is easy to use, and cold water becomes difficult to use. Further, when a large ice block is formed on the water surface, the top reaches the supercooler 6, which may trigger the release of the supercooled state in the supercooler 6.
[0042]
Therefore, in consideration of the problem of adhesion of the ice 7, it is preferable that the floating body 40 does not have a dent, a pointed portion, or an angular portion that causes a water pool. Also, when considering free floating / movement of the floating body 40, it is preferable that there are no sharp or angular portions.
[0043]
Therefore, it can be said that the spherical floating body 40 is most suitable from the above. The size of the floating body 40 to be thrown in can be arbitrarily selected in consideration of handleability and the like. At this time, if the shape of the floating body 40 is too small, in the case where the specific gravity is close to that of the water 4, it is sucked up to the water intake port that circulates the water 4 and causes a device trouble. It should be of a size that does not occur.
[0044]
An arbitrary amount of floating body 40 can be put into the ice heat storage tank 8. For example, the floating body 40 of the amount that substantially covers the water surface of the ice heat storage tank 8 is thrown in, or the floating body 40 that is larger than the amount that covers the water surface of the ice heat storage tank 8 is thrown in, so You may make it overlap on the surface of the water.
[0045]
The operation of the above embodiment will be described below.
[0046]
In FIG. 1, the supercooled water 5 supercooled by the supercooler 6 is discharged from the supercooler 6 and falls into the ice heat storage tank 8.
[0047]
At this time, since the floating body 40 is introduced and floats on the water surface of the ice heat storage tank 8, the supercooled water 5 collides with the floating body 40, and the supercooling is released by the impact force to generate the ice 7. .
[0048]
If the floating body 40 of an amount that substantially covers the water surface of the ice thermal storage tank 8 is put in the ice thermal storage tank 8, most of the supercooled water 5 falling from the supercooler 6 collides with the floating body 40 evenly. Thus, the supercooling is released satisfactorily and the generation of ice 7 is promoted. The generated ice 7 is accumulated between the floating body 40 and the water 4. At this time, the floating body 40 and the water 4 are impacted by the fall of the supercooled water 5, whereby the water 4 flows as shown by broken lines in FIGS. 1 and 2, and the ice 7 generated thereby is the ice heat storage tank. 8 is uniformly dispersed. Also, at this time, the floating body 40 that has received an impact floats immediately after sinking below the water surface to cover the water surface, and the floating body 40 other than where the supercooled water 5 is dropped always covers the water surface. It will move cyclically.
[0049]
Further, since at least the outer surface of the floating body 40 that floats on the water surface is made of a non-adhesive material to which the ice 7 is difficult to adhere, the generated ice 7 is difficult to adhere, and the floating body 5 falls. The ice 7 is difficult to adhere because the water surface constantly fluctuates up and down by the water surface that is fluctuating due to the impact of the water and circulates. The ice 7 may temporarily adhere on the surface of the floating body 40, but the momentum of the water and the balance of the floating body 40 to which the ice 7 has adhered are lost, and the location where the ice 7 has adhered rotates to contact the water 4. The ice 7 is washed with the water 4 and peeled off from the floating body 40 and accumulated in the lower part of the floating body 40.
[0050]
In this way, the floating body 40 always covers the water surface and prevents the ice 7 from coming into direct contact with the atmosphere. Therefore, the heat input from the upper part of the ice heat storage tank 8 is blocked and the effect of heat insulation and heat insulation is exhibited. Therefore, the generated ice 7 can be prevented from melting. Therefore, the operating cost of the ice heat storage device can be suppressed.
[0051]
Further, when the amount of the floating body 40 put into the ice heat storage tank 8 is added more than the amount covering the water surface of the ice heat storage tank 8, the floating body 40 is disposed so as to overlap the water surface. The chance that 5 collides with the floating body 40 is further increased and the effect of generating ice 7 is promoted, and the effect of blocking heat input from the upper part of the ice heat storage tank 8 by covering the water surface can be further enhanced.
[0052]
In order to maintain a stable supercooled state of the supercooler 6, precise temperature adjustment and flow rate adjustment are required. For this reason, in the conventional apparatus, changing the temperature and flow rate of the subcooler alone is not often performed. As a method for dealing with fluctuations in the heat storage capacity due to the season or demand, generally, the heat storage time is adjusted, or when there are a plurality of devices, the number of operating units is adjusted.
[0053]
According to a test conducted by the present inventors, a test result was obtained that, when the flow rate of the supercooling water 5 is decreased, blockage in the supercooler 6 is less likely to occur. Therefore, as a means for avoiding the blockage of the subcooler 6, it is one effective measure to reduce the flow rate from the rated value.
[0054]
However, in the conventional device, since the supercooling release device such as the collision plate is fixed, it is necessary to move the collision plate to that position when the drop position of the supercooling water changes with the fluctuation of the flow rate of the supercooling water. However, according to the floating body 40 of the present invention, such a problem does not occur at all.
[0055]
Furthermore, as shown in FIG. 5, even in a configuration in which a plurality of supercoolers 6 are installed, the floating body 40 always covers the water surface of the ice heat storage tank 8, so a special supercooler is installed again. There is no need.
[0056]
As described above, a large number of floating bodies 40 made of a material on which the surface of the ice 7 is difficult to adhere to the surface of the ice heat storage tank 8 where the supercooling water 5 falls from the supercooler 6 are put and floated. Since the supercooling water 5 falling from the supercooler 6 collides with the floating bodies 40, the supercooling water 5 is released from the supercooling state by the impact force caused by the collision with the floating body 40, and the ice 7 is effective. The generated floating body 40 has an effect that the generated ice 7 is difficult to adhere, and the floating body 40 covering the water surface suppresses heat input from the upper part of the ice heat storage tank 8 to prevent the ice 7. There is an effect to suppress melting of.
[0057]
Therefore, compared with the conventional ice heat storage apparatus, a high ice-making effect and high cold storage performance can be exhibited with a simple configuration, and system efficiency can be improved.
[0058]
【The invention's effect】
According to the present invention, it is possible to exhibit a high ice-making effect and a high cold storage performance with a simple configuration, and thus there is an effect that the system efficiency can be improved.
[0059]
After the input to the floating body. Thus the water surface at least the ice thermal storage tank is covered, the ice making effect as the cold accumulating performance is an effect of further enhanced.
[0060]
If at least the outer surface of the floating body is made of a non-adhesive material to which ice does not easily adhere, problems such as ice adhering to the floating body can be prevented.
[0061]
Moreover, the structure which floated the floating body in the ice thermal storage tank has an effect which can respond easily also to the change of operation states, such as the flow volume of supercooling water.
[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 diagram showing the operation of a floating body, water, and ice.
3A, 3B, 3C, and 3D are cross-sectional views showing examples of the shape of a floating body, and FIG. 3E is a side view of the floating body.
FIG. 4 is a schematic system diagram of a conventional ice heat storage device.
FIG. 5 is a schematic system diagram of a conventional ice heat storage device in which a plurality of supercoolers are arranged in parallel.
FIG. 6 is a schematic side sectional view showing an example of a conventional supercooler.
FIG. 7 is a schematic side sectional view showing another example of a conventional supercooler.
FIG. 8 is a schematic side sectional view showing still another example of a conventional supercooler.
FIG. 9 is a schematic system diagram of an ice heat storage device having an indirect cooling refrigerator.
FIG. 10 is a schematic system diagram of another ice heat storage device having an indirect cooling type refrigerator.
FIG. 11 is a schematic system diagram of an ice heat storage device having a direct cooling type refrigerator.
[Explanation of symbols]
4 Water 5 Supercooled water 6 Supercooler 8 Ice heat storage tank 40 Floating body 43 Non-adhesive material

Claims (2)

In the ice storage tank that receives the supercooled water discharged from the supercooler outlet of the ice storage device, a floating body that floats on the water surface inside the ice storage tank and can move freely is placed so that at least the water surface of the ice storage tank is covered and ice thermal storage apparatus being characterized in that so as to release the supercooled water caused to collide with the floating body supercooling from subcooler outlet. Floating of at least the outer surface, the ice heat storage device according to claim 1, wherein the ice is made of a non-adherent material which hardly adheres.

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