KR100525071B1 - Ice container for thermal storage system - Google Patents

Abstract

The present invention relates to an ice container of an ice heat storage system, the ice container of the ice heat storage system having a hollow filling portion, comprising: a coupler provided to open one side of the ice container; It is characterized in that it comprises an expansion receiving member consisting of a coupling portion coupled to the coupling portion, the expansion receiving portion is formed integrally with the coupling portion and is accommodated in the freezing container and contracted by volume expansion during freezing of the freezing liquid and restored to its original shape upon thawing. It provides an ice container of the ice heat storage system. As a result, the ice container of the ice storage system can be prevented from being damaged by ice expansion and sea ice shrinkage, and the heat transfer surface can be enlarged to improve freezing and thawing efficiency, and to reduce buoyancy problems and reduce maintenance costs. .

Description

ICE CONTAINER FOR THERMAL STORAGE SYSTEM}

The present invention relates to an ice container of an ice heat storage system, and more particularly, to an ice container of an ice heat storage system having a hollow filling portion, comprising: a coupling tool provided to open one side of the ice container; And an expansion-receiving member formed of an expansion-receiving portion which is formed integrally with the coupling portion and is formed integrally with the coupling portion and is accommodated in the ice-breaking container and is contracted by volume expansion upon freezing of the freezing liquid and restored to its original state upon thawing. The ice container of the ice heat storage system characterized in that.

The ice storage system uses low-cost late-night power to store ice-cold heat and uses it for cooling during the day. This system aims to level power supply by replacing the peak power consumption for daytime with midnight electricity.

The principle of the ice heat storage cooling system is that when the water is cooled to the freezing point using the low temperature freezer as the freezing heat source, the water becomes ice and stores about 80 kcal of latent heat corresponding to 1 kg of ice when it is converted from liquid to solid. In contrast, about 80kcal of latent heat of fusion is released when ice is thawed with water, and this latent heat is used in ice storage cooling systems.

In general, the ice storage system has an ICE ON COIL TYPE method that freezes outside of the coil, and an ice container that freezes and thaws water or phase change materials, which are the icing liquid filled in the container. ) Ice, a slurry (ICE SLURRY TYPE) method that freezes the ice formed using a mixture of additives such as methanol or propylene glycol in the form of slurry, which is a fine particle, and the surface of the freezing plate through which refrigerant flows. It is classified as ICE HARVEST TYPE type by releasing ice by injecting water and then circulating refrigerant gas and de-icing it in the form of ice on ice plate.

Here, in the ice storage system of the ice container type, a repetitive action of freezing and thawing the frozen liquid filled in the sealed container is essential. For reference, when water of 0 ℃ is changed into ice, volume expansion of about 9.07% is achieved.

Therefore, if the sealed freezing container does not absorb the volume expansion of the freezing, it is frozen by the expansion pressure, and even if the freezing container is formed with a buffer air layer or an expansion dimple and an expansion bend that absorbs the expansion pressure and contraction, the expansion pressure and contraction are the freezing container. As the fatigue of continuous expansion and contraction accumulates and the shell (SHELL) is damaged, it is eventually broken.

However, the ice container should be heat-exchanged with the brine that flows the outer surface of the ice container using the outer shell as a heat conduction unit. It is limited in the size of the container, the thickness of the shell and the material selection of the thermal conductivity, and buffers the ice expansion and ice shrinkage. The air layer in the freezing vessel formed for the purpose of forming a heat insulating film can reduce the heat exchange efficiency and cause buoyancy problems, thereby limiting the expansion of the air layer.

The freezing container manufactured by a simple manufacturing process is a standard product, easy to mass production and supply, easy to operate as a lightweight product, can be installed in any heat storage tank structural conditions, and has advantages over other ice storage methods such as low initial investment cost. On the other hand, the serious disadvantage of the freezing container is the breakage of the freezing container and the broken freezing container is very difficult to identify and replace. New products have been developed and supplied to the market to form corrugated depressions, bends, spiral protrusions, etc., which absorb expansion and contraction as a means to solve the fatigue and contraction fatigue that cause breakage of ice containers. Fatigue accumulation due to expansion and thawing shrinkage is still a problem of breakage of the freezing container. In addition, the conventional spherical freezing container has difficulty in maintaining the brine flow because it is difficult to systematically maintain a constant brine flow interval in the heat storage tank. And heat exchange deflection, and the freezing vessels loaded in the heat storage tank may flow due to buoyancy and inadequate support, resulting in a deflection of the heat exchange blind spots and loading generated between the freezing vessels, thereby reducing heat exchange efficiency. .

9 is a schematic cross-sectional view of a conventional ice container. As shown, the conventional freezing container 100, the freezing liquid filling unit 113, and a plurality of expansion thimple 112 to expand and contract the freezing liquid expansion and thawing shrinkage of the freezing liquid to reduce the breakage of the freezing container and The filling block 115 is configured to inject and close the icing liquid.

By this configuration, while brine (BRINE) supplied for freezing from a freezer (not shown) is continuously recycled through a heat storage tank (not shown), the freezing liquid in the freezing container 100 freezes toward the center at the outer shell and freezing process. Freezing expansion generated in the absorption is absorbed by the expansion action of the expansion dimple 112 formed in the freezing container (100).

The brine, which absorbs heat from the heat exchanger (not shown) during cooling, flows into the heat storage tank (not shown), and phase-changes the ice in the freezing container to the freezing liquid. During continuous recirculation to the sea ice and ice heat dissipation process is performed, the expansion dimple 112 is contracted by the sea ice to restore the original.

Although not described in the specification and drawings of the present application, unlike the aforementioned ice container 100, a conventional ice container (not shown) provided with a buffer air layer absorbs the ice expansion by the compression action of the slow air. The prepared ice container (not shown) is usually filled with about 97% of freezing liquid and 3% of the air layer, and the freezing container (not shown) on the surface of the heat storage tank (not shown) filled with brine due to the buoyancy effect of the air layer. As a result, the sedimentation device for forcibly settling into the surface of the heat storage tank (not shown) using a submerged lattice (not shown) and a fixed diaphragm (not shown) of the ice container (not shown) is required. The air layer (not shown) in the (not shown) has an effect of buffering the expansion due to freezing, while an insulating film is formed in the freezing container (not shown) to generate a decrease in heat conduction and buoyancy of the freezing and thawing. There is a problem.

In addition, the freezing expansion and the thawing shrinkage action of the freezing container 100 is absorbed by the expansion and contraction of the expansion dimple 112, but the constant freezing container 100 is usually made of high density polyethylene (HIGH DENSITY POLYETHYLENE) to increase the freezing container When the freezing container 100 is broken, the freezing liquid and the brine flowing in the heat storage tank (not shown) may be mixed, which may adversely affect the freezer (not shown) and the freezing load. In the heat storage tank (not shown) filled with a large amount of freezing container 100 and brine, it is almost impossible to pick out and replace the broken freezing container 100 with the naked eye, thereby moving the freezing container 100 out of the heat storage tank (not shown). Pick out the damaged freezing container 100 or drain the brine from the heat storage tank (not shown) when the ice storage system stops operating, and the worker enters the heat storage tank (not shown) to select and replace the damaged freezing container 100. By this action should not only be difficult, there is a problem that a lot of work time-consuming and increases maintenance costs.

It is therefore an object of the present invention to provide an ice container of an ice heat storage system having a means capable of absorbing ice expansion and sea ice shrinkage to prevent breakage and reduce maintenance costs.

Another object of the present invention is to provide a freezing container of an ice storage system having a means capable of eliminating a buffered air layer in the freezing container and enlarging the surface of the heat conduction so as to reduce buoyancy and improve freezing and thawing efficiency.

It is still another object of the present invention to provide an ice container of an ice heat storage system having a means for causing the ice container to settle into the water surface of the heat storage tank.

In order to achieve the above object, the present invention, in the ice container of the ice heat storage system having a hollow filling portion, the coupling sphere is provided by opening one side of the ice container; And an expansion-receiving member formed of an expansion-receiving portion which is formed integrally with the coupling portion and is formed integrally with the coupling portion and is accommodated in the ice-breaking container and is contracted by volume expansion upon freezing of the freezing liquid and restored to its original state upon thawing. It provides an ice container of the ice heat storage system characterized in that.

Here, the freezing container is preferably applied in the form of a sphere (BALL) or a cylindrical shape having a hollow filling portion, but may also be applied to freezing containers in the shape of an angle cylinder, a polygonal cylinder, a polyhedron cylinder, and the like. It is preferable to use the joining hole formed by opening one side as a freezing liquid filling hole. The freezing container is preferably made of synthetic resin such as high density polyethylene, but the non-ferrous metal having high corrosion resistance and thermal conductivity such as aluminum alloy or stainless steel ( It can also be manufactured from CAN made of NONFERROUS METAL.

In addition, the freezing container for accommodating the inflation-accommodating member has almost no expansion pressure in the freezing container by absorbing the freezing expansion and thawing shrinkage, and the pressure in the freezing container may be in a natural pressure state even when the freezing liquid is thawed. Therefore, the airtight coupling method in which the coupling groove having a larger diameter than the coupling groove that is capable of press-fitting the coupling tool is formed by force-fitting the coupling tool by air-tight coupling. have.

The coupler and the coupler is preferably a press-fitted structure, but can also be applied to the coupler and the coupling portion of the other coupling method, such as screw, crimping or adhesive.

delete

In addition, the freezing vessel may further include at least one heat transfer protrusion or heat transfer depression in communication with the filling unit along the outer circumferential surface of the freezing container as a means for improving freezing and thawing efficiency of the freezing liquid.

One side of the freezing container preferably further includes a weight coupling unit that can be equipped with a weight to allow the freezing container filled with the freezing liquid to settle into the surface of the heat storage tank, the weight is provided to seal the body of the freezing container It may be.

In addition, the expansion receiving member is preferably applied to an elastic material such as silicone or synthetic rubber having resilience and low temperature elasticity, cold resistance and chemical resistance.

In addition, the coupling portion press-fitted to the coupler is a coupling groove coupled to the coupling surface of the coupling unit along the outer circumferential surface, and the removable guide portion having an inward inclined surface formed in the lower portion of the coupling groove to guide the forced indentation and separation to the coupling It is preferably formed to further include, in order to reinforce the coupling strength of the coupling groove may be provided integrally provided with a reinforcing portion along the inner peripheral surface of the coupling portion, or may further comprise a ring-shaped compression ring.

In addition, the expansion receiving member preferably has a hollow expansion receiving portion to which the brine comes and goes, but may also be configured as a sealed expansion receiving portion formed of a material having resilience when shrinking and thawing by freezing expansion. The outer diameter (OUT DIA) facing the lower portion (OUT DIA) preferably has a diameter equal to or slightly smaller than the diameter of the coupler to facilitate insertion into the coupler. The expanded receptacle has a minimum amount of brine even when it is contracted by freezing expansion. It is preferable that the inner wall is configured to have a contraction space that does not contact each other so as to flow. In addition, the expansion receiving portion preferably has a shrinkage volume including a volume that is increased when the freezing liquid in the freezing container freezes and a shrinking space that is formed even after freezing. A weight at the bottom of the expansion receiving portion settles the freezing container into the water surface. The freezing vessel may be configured with a plurality of couplers and an expansion receiving member. And it is preferable that the expansion container accommodated in the freezing container has a depth of about the radius of the freezing container in the linear direction of the expansion container to maximize the volume of the freezing liquid, but the depth of the expansion container may be shortened or further extended. Do not receive.

Hereinafter, various exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Prior to the description, in various embodiments, components having the same configuration will be representatively described in one embodiment using the same reference numerals, and in other embodiments, only the configuration different from the embodiment will be described.

FIG. 1 is a schematic cross-sectional view of a freezing container according to a first embodiment of the present invention, FIG. 2 is a schematic freezing state view of FIG. 1, and FIG. 3 is a schematic enlarged cross-sectional view of an essential part of FIG. 1. As shown in these drawings, the ice container 10 is a spherical structure with a hollow filling portion 40 formed therein, and the coupling portion 21 of the expansion receiving member 20 communicates with one side of the ice container 10. Coupling sphere 14 is provided to be coupled to the coupling, coupled to the coupling sphere 14 and forming a coupling groove (not shown), and formed integrally with the lower portion of the coupling portion 21 An expansion receiving member 20 having an expansion receiving portion 23 to be received is coupled to the freezing container 10.

Here, the coupling sphere 14 is formed with a diameter smaller than the diameter of the coupling groove (not shown) formed along the outer circumferential surface of the coupling portion 21 to maintain the coupling airtight.

In addition, the expansion receiving member 20 is a tubular structure in which one side is opened and the other side is closed, and a coupling part 21 having a coupling groove (not shown) which is press-fitted with the coupling port 14 of the icing container 10. In addition, the coupling groove (not shown) is guided to the coupler 14 for easy insertion and removal, and the detachable guide part 22 having an inwardly inclined surface and the expansion accommodating part 23 are integrally formed. The outer diameter of the expansion receiving portion 23 is provided with an outer diameter equal to or slightly smaller than the diameter of the coupling portion 14 to facilitate insertion into the coupling hole 14. The expansion receiving portion 23 is the freezing container 10. The contracted shrinkage space 26 is provided to allow a minimum amount of brine to flow even during freezing. And, as shown in Figure 3, in order to reinforce the strength of the press fitting of the coupler 14 and the coupling groove (not shown), the pressing ring 25 is press-installed on the inner side of the coupling portion. In the combination of the sphere 14 and the expansion receiving member 20, the expansion receiving in the end direction of the expansion receiving portion 23 through the engaging port 14 of the freezing container 10 filled with a predetermined amount of freezing liquid When the member 20 is inserted, the detachable guide part 22 has an inclined inward surface and is formed to extend to a predetermined diameter than the inner diameter IN DIA of the coupling groove 14 toward the coupling groove direction. In this state, when forcibly pressurizing the expansion receiving member 20 along the inclined surface of the detachable guide part 22, the detachable guide part 22 is inserted while being contracted by elasticity to the inner diameter of the coupling hole 14, When the coupling groove is inserted into the opening end of the coupling sphere 14, the coupling groove is the original type by the elastic restoring force As a result, it is in close contact with the open end face of the coupler 14. Thus, the airtight (watertight) coupling between the coupler 14 and the coupling groove and the accommodation fixing of the expansion receiving member 20 in the freezing container 10 are completed. Then, by pressing the mounting ring 25 to the inner surface (inner circumferential surface) of the coupling portion 21 opposite to the coupling groove, the coupling strength of the coupling hole 14 and the coupling groove is further strengthened.

Thus, as shown in Figure 2, the frozen liquid filled in the filling portion 40 in the freezing container 10 absorbs the freezing cold heat from the brine flowing through the outer surface of the freezing container 10, the freezing container 10 Slowly freezing in the direction of the center from the inner wall of the, the volume expansion of the freezing process is delivered to the expansion receiving portion 23 to shrink the expansion receiving portion 23 to the brine flows by volume expansion amount, thawing is the reverse of the freezing Eventually, the contracted expansion receiving portion 23 is restored to its original shape by the elasticity.

By this configuration, it is possible to prevent the breakage of the freezing container 10 by absorbing the freezing expansion and thawing shrinkage of the freezing container 10, the outer side is accommodated in the freezing liquid and the expansion receiving portion 23 to the brine coming and going It is possible to obtain the effect of the additional heat conduction properties of the freezing and thawing through the heat transfer surface of the, and by removing the air layer in the freezing container (10) can reduce the buoyancy and heat transfer area to improve heat exchange efficiency, expansion receiving part By quantifying that the brine level flowing through the heat storage tank fluctuates due to the contraction and restoration of (23), the level of frost and the level of ice are reduced. Can manage

4 is a schematic cross-sectional view of an ice container according to a second embodiment of the present invention. As shown, unlike the first embodiment described above, the bottom portion of the expansion receiving portion 23 formed in the expansion receiving member 20 is further provided with a configuration of the first weight (30).

Here, the first weight 30 is a corrosion-resistant metal material, to reduce the buoyancy of the freezing vessel 30 to induce sedimentation into the water surface of the heat storage tank (51).

By this configuration, the freezing vessel 10 is immersed in the water surface of the heat storage tank 51 filled with brine, the submerged lattice and the freezing vessel of forced sedimentation is installed as a means to solve the buoyancy problem of the conventional freezing vessel 100 It can reduce equipment cost of fixed partition.

5 is a schematic cross-sectional view of an ice container according to a third embodiment of the present invention. As shown, unlike the second embodiment described above, the weight coupling portion 16 and the weight coupling portion 16 formed integrally with the bottom of the freezing container 10 facing the coupling sphere 14 The second weight weight 31 is inserted into and fixed to the upper and lower sides thereof. Here, the weight coupling portion 16 formed in the freezing container 10 can be configured in various positions. It is not restricted.

6 is a schematic cross-sectional view of an ice container according to a fourth embodiment of the present invention. As shown, unlike the above-described embodiments, it further comprises a configuration of a plurality of heat transfer projections 12 formed in communication with the filling portion along the outer circumferential surface of the freezing container (10a).

Here, the heat transfer protrusion 12 has a substantially conical shape to enlarge the filling space and the heat transfer area of the freezing liquid and provide a flow interval of brine between the freezing containers 10a.

By this configuration, it is possible to increase the heat transfer area of the freezing container 10a and to improve freezing and thawing efficiency, to smoothly flow brine along the outer surface of the freezing container 10a, and to freeze through the heat transfer protrusion 12. There is also an effect of the role of fasteners in which the containers 10a are engaged with each other.

7 is a schematic cross-sectional view of an ice container according to a fifth embodiment of the present invention. As shown, unlike the above-described embodiments, as a freezing container 10b having a can-shaped structure using a non-ferrous metal material such as aluminum alloy and stainless steel, the reinforcement part integrally formed along the inner circumferential surface of the coupling part 21. More including 24 The expansion receiving member 20a is coupled.

And a plurality of curved protrusions 11 formed along the outer circumferential surface of the freezing container 10b and the bottom of the freezing container 10b to strengthen the self-support of the freezing container 10b and provide a flow interval of brine. The part 17 is provided.

By such a configuration, it is possible to provide a freezing container 10b that can improve the safety, freezing, and thawing efficiency of the product through a can-shaped freezing container composed of a nonferrous metal material having better thermal conductivity than a synthetic resin material. In the following will be described an example of the configuration of the ice heat storage system using the ice container 10 according to the first embodiment of the present invention.

delete

FIG. 8 is a schematic system diagram of an ice storage system as an embodiment using the ice container of FIG. 1. As shown, the ice storage system according to an embodiment of the present invention, a freezing container 10 having an expansion receiving member 20, a brine inlet (not shown) and outlet (not shown) and a plurality of freezing containers A storage tank 51 for accommodating and installing 10, flowing brine as a refrigerant, freezing and thawing the freezing liquid in the freezing container 10, and a freezer 50 for cooling the brine for freezing to a predetermined temperature. ), A cooling tower 53 for cooling the condensation heat generated in the condenser (not shown) of the refrigerator 50, a heat exchanger 52 for heat exchange while flowing cold water and brine, a brine suction pipe 65 and a brine discharge pipe. A brine pump 55 for recirculating the brine to the freezer 50, the heat storage tank 51, and the heat exchanger 52 through the 66, a coolant supply pipe 70, a coolant suction pipe 71, and a coolant discharge pipe 72. Cooling water through the condenser (not shown) and the cooling tower (53) of the freezer (50) Cooling water pump (54) for recirculating flow to the furnace, the first control valve (56) for controlling the opening and closing of the brine supplied to the heat storage tank (51) through the brine inlet pipe (62), and the heat storage tank (through the brine supply pipe (60) The second control valve for controlling the bypass flow of the brine supplied to the 51 and the opening and closing of the brine returned from the brine return pipe 63 of the heat exchanger 52 and the brine discharge pipe 64 of the heat storage tank 51 ( 57, a third control valve 58 for controlling the opening and closing of brine supplied to the heat exchanger 52 through the brine supply pipe 60, and an ice storage system measurement and operation control device (not shown). .

By such a configuration, while the brine supplied for freezing from the freezer 50 is continuously recycled through the heat storage tank 51, the freezing liquid in the freezing container 10 freezes and the volume expansion of the freezing process is performed by the expansion receiving portion ( It is delivered to 23 to the expansion receiving portion 23 that the brine is coming and going to shrink by the amount of volume expansion.

In addition, the brine absorbing heat from the cold water recycled to the heat exchanger 52 through the cold load unit 90 during the thawing flows into the heat storage tank (not shown), and the ice in the freezing container 10 is transferred to the freezing liquid. The brine absorbing the heat of fusion while the phase change is recycled to the heat exchanger 52 while the continuous thawing and ice heat radiating action for cooling and heat-exchanging the cold water flowing between the cold heat load unit 90 and the heat exchanger 52, In accordance with the degree of thawing of ice in the ice container 10, the expansion receiving portion 23 is to restore the original shape in a cylindrical shape.

As described above, the expansion receiving member absorbs the freezing expansion and thawing shrinkage of the freezing container and prevents breakage, and by expanding the heat transfer surface of the freezing container through the expansion receiving portion and the heat transfer protrusion, the freezing and thawing efficiency can be improved. By lowering the ice container into the surface of the heat storage tank through the weight, it is possible to reduce the buoyancy problem of the ice container and save the forced sedimentation equipment cost, and to provide an ice heat storage system that can reduce the maintenance cost.

In each of the above-described embodiments of the present invention, the exemplary embodiment of the spherical freezing container has been described above. However, the freezing container may be applied to other shapes such as a cylindrical shape, a polygonal cylinder shape, and a polyhedral cylinder shape.

In the above-described embodiments of the present invention, the coupling portion of the icing container and the coupling portion of the expansion receiving member are press-fitted as representative embodiments, but may be applied to other coupling methods such as screw type, compression type, adhesive type, and the like.

In addition, in the above-described embodiments of the present invention, the cylindrical expansion receiving member is described as a representative example, but may be applied to other tubular shapes such as elliptical, and also applied as a sealed expansion receiving member having elasticity of expansion and contraction. Of course you can.

In the above-described embodiment of the present invention described above for inserting and fixing a separate weight to the weight coupling portion, but can be manufactured by sealing to the body of the freezing container, the number and position of the weight is not limited. to be.

As described above, according to the present invention, it is possible to prevent breakage due to freezing expansion and sea ice shrinkage, and to expand the heat transfer surface to improve freezing and thawing efficiency, and to reduce buoyancy problems and reduce maintenance costs. The ice container of the system is provided.

1 is a schematic cross-sectional view of an ice container according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the schematic freezing state of FIG. 1. FIG.

3 is a schematic enlarged cross-sectional view of the main part of FIG. 1;

Figure 4 is a schematic cross-sectional view of the ice container according to a second embodiment of the present invention.

5 is a schematic cross-sectional view of an ice container according to a third embodiment of the present invention.

6 is a schematic cross-sectional view of an ice container according to a fourth embodiment of the present invention.

7 is a schematic cross-sectional view of an ice container according to a fifth embodiment of the present invention.

8 is a schematic system diagram of an ice storage system as an embodiment using the ice container of FIG. 1, and FIG. 9 is a schematic cross-sectional view of a conventional ice container.

<Code Description of Main Parts of Drawing>

10, 10a, 10b, 100: freezing container 11: bending protrusion

12: heat transfer projection 14: coupling sphere

16: weight coupling portion 17: depression

20, 20a: expansion receiving member 21: coupling portion

22: detachable guide portion 23: expansion receiving portion 24: reinforcement portion 25: pressing ring 26: contraction space 30: first weight

31: second weight 40, 113: filling unit

50: freezer 51: heat storage tank

52: heat exchanger 53: cooling tower

54: cooling water pump 55: brine pump

56: first control valve 57: second control valve

58: third control valve 60: brine supply pipe

62: brine inflow tube 63: brine return tube

64: brine discharge pipe 65: brine suction pipe

66: brine discharge pipe 70: cooling water supply pipe

71: cooling water suction pipe 72: cooling water discharge pipe

80: cold water supply pipe 81: cold water return pipe

90: cold load portion 112: expansion dimple

115: charging port

delete

Claims (6)

In the ice container of the ice heat storage system having a hollow filling part, A coupling tool provided by opening one side of the freezing container; A coupling part coupled to the coupling part; The freezing container of the ice heat storage system, characterized in that it comprises an expansion receiving member formed integrally with the coupling portion and is contained in the freezing container and is expanded in the freezing container to be contracted by volume expansion upon freezing of the freezing liquid and restored to its original shape upon thawing. The method of claim 1, The freezing vessel further comprises any one of a plurality of heat transfer protrusions formed in communication with the filling portion along the outer circumferential surface, and a plurality of heat transfer depressions formed in communication with the filling portion along the outer circumferential surface of the ice storage system. Freezing container. The method of claim 1, The freezing vessel, the freezing vessel of the ice heat storage system, characterized in that it further comprises at least one weight to settle the freezing vessel into the water surface. The method of claim 1, The freezing container is any one of a freezing container of a synthetic resin material and a freezing container having a can-shaped structure as a non-ferrous metal material. The method of claim 1, The expansion container, the ice container of the ice heat storage system, characterized in that it further comprises at least one weight to settle the ice container into the water surface. The method of claim 1, The coupling portion further includes a detachable guide portion having an inclined surface for guiding a forced indentation and detachment to the coupling groove and the coupling tool along the outer peripheral surface, The ice heat storage system further comprising any one of a reinforcing part integrally formed along the inner circumferential surface of the coupling part and reinforcing the indentation coupling, and a ring-shaped pressing ring fixed to the inner side of the coupling part to be press-fitted to reinforce the indentation coupling. Ice container.