JPH11337238A - Ice thermal storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detach an ice from an ice-making surface with small energy loss in an ice thermal storage system in which a low-temperature anti-freeze solution on an inner side of the ice-making surface, water flows on an outer surface of the ice-making surface to make an ice, and the ice is detached from the ice-making surface when the ice-making quantity reaches a specified value. SOLUTION: A heat exchanger 3 to heat an anti-freeze solution, a high- temperature anti-freeze solution tank 12, and a low-temperature anti-freeze solution tank 10 are provided in a refrigeration cycle. During the ice-making operation, the high-temperature anti-freeze solution is led to the heat exchanger 3, and the high-temperature anti-freeze solution is heated and stored in the high-temperature anti-freeze solution tank 12. When an ice is detached from an ice-making surface, the high-temperature anti-freeze solution stored in the high-temperature anti-freeze solution tank 12 is led to the inner side of an ice-making heat exchanger 6 to promote the detachment of the ice from the ice-making heat exchanger 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage system for making ice using electric power at night and melting and using the ice during the day.

[0002]

2. Description of the Related Art The demand for electric power load leveling is increasing in society, and as one of the means, an ice heat storage system that makes ice using nighttime electric power and melts and uses the ice during daytime air conditioning operation is used. It has been proposed for a long time. There are various types of this ice heat storage system, but a dynamic type that makes ice by flowing antifreeze liquid inside the ice making heat exchanger and water down the outside and when the ice making amount reaches a specified value, ice is released from the ice making surface. Attention is paid to the direct expansion type harvest heat storage which is one of the ice storages. In the direct expansion type harvest heat storage, energy is reduced by utilizing the latent heat of vaporization of the refrigerant.

Conventionally, in the direct expansion type harvest type ice heat storage, when using cold heat, water in an ice heat storage tank storing fragmented ice is circulated to a heat exchanger for generating ice by a pump or the like.
Water was sprayed from a spray head provided above the ice thermal storage layer to melt the shards of ice and to utilize the latent heat. Further, as another conventional method, when the ice making amount reaches a specified value, the valve of the refrigeration cycle is switched to stop the supply of the refrigerant liquid. At the same time, high-pressure and high-temperature refrigerant gas from the compressor or high-temperature and high-pressure refrigerant gas in the condenser and high-pressure receiver are passed inside the ice making heat exchanger to heat the outer surface of the ice making heat exchanger. Was. This is called a hot gas deicing method, in which the outer surface of the heat exchanger is heated to melt the ice on the surface of the heat exchanger, and the produced ice is released.

As another method, an indirect cooling type, that is, a low-temperature antifreeze solution is flown inside an ice making heat exchanger, and water is made to flow down on the outer surface of the ice making heat exchanger to make ice. In some cases, heated antifreeze is poured inside the ice-making surface when the ice-making surface is reached to release ice from the ice-making surface. in this case,
As a means for heating the antifreeze, other heat sources such as an electric heater have been used.

[0005] In each of the above ice heat storage systems, a method for separating ice after ice making from the surface of the heat exchanger is disclosed in Japanese Patent Application Laid-Open No. 9-14 / 1997.
702, JP-A-7-19688, JP-A-8-285
334, JP-A-7-55303, JP-A-8-261
No. 614, etc.

[0006]

In a so-called harvesting system in which ice made on the surface of an ice making heat exchanger is heated from the inside of the ice making heat exchanger and deiced, the ice making surface is heated by some method during deicing. It is necessary to. And
Supplying thermal energy to separate ice from the ice-making surface is not only wasteful for the purpose of creating ice originally, but also double-melting in terms of melting ice that has been made. It is something.

In the above-mentioned prior art, in order to solve such a problem even a little, for example, Japanese Patent Laid-Open No. 7-196
No. 88 describes suppressing the wasteful energy consumption by applying a hydrophobic coating to the ice making surface. However, applying a hydrophobic coating to the ice making surface has disadvantages such as an increase in cost from the viewpoint of manufacturing and difficulty in processing. Japanese Patent Application Laid-Open No. 8-285334 discloses that when the produced ice remains on the ice-making surface after deicing, the supply amount of water to the ice-making surface is made variable, and the supply water is stimulated at the start of ice-making. Deicing is described. According to this conventional example, the deicing time can be reduced, but the deicing method itself is a conventional method, and wasteful energy is consumed. In addition, although the method described in Japanese Patent Application Laid-Open No. Hei 9-14702 also uses brine water to melt ice from an ice making surface and reduces wasteful energy consumption,
Still not enough. Further, those described in JP-A-7-55303 and JP-A-8-261614 are so-called hot gas systems and require extra energy for deicing. The present invention has been made in view of the above-mentioned disadvantages of the related art, and has as its object to use the sensible heat of a condensate in a refrigeration cycle to promote the detachment of ice from an ice making surface. Another object of the invention is to release ice from the ice making surface with as little extra energy as possible. Still another object of the present invention is to enable ice to be separated from an ice making surface with a simple configuration. further,
It is another object of the present invention to reduce the time required for ice to be released from the ice making surface and to provide a highly reliable ice thermal storage system that does not adversely affect the ice thermal storage means.

[0008]

A first feature of the present invention to achieve the above object is to provide a refrigeration cycle formed by sequentially connecting a compressor, a condenser, an expansion means, and an evaporator with piping, In an ice heat storage system having an ice making means, a low-temperature antifreeze obtained by an evaporator of the refrigeration cycle and a heat exchanger provided between the compressor and the condenser or between the condenser and the expansion means. And selectively flowing the high-temperature antifreeze to the ice making means.

A second feature of the present invention for achieving the above object is that a refrigeration cycle formed by sequentially connecting a compressor, a condenser, an expansion means, and an evaporator to a pipe, and a refrigeration cycle generated by the evaporator. In an ice heat storage system including ice making means for generating ice by exchanging heat with a low-temperature antifreeze which exchanges heat with cold, a heat exchanger is provided between the condenser and the expansion means, and refrigeration is performed in this heat exchanger. A piping system is provided for guiding the high-temperature antifreeze liquid that has exchanged heat with the refrigerant flowing in the cycle to the ice making means.

[0010] Preferably, the heat exchanger supercools the refrigerant. Further, a first valve for controlling the flow of the low-temperature antifreeze liquid between the evaporator and the ice making means is provided, and a valve for controlling the flow of the high-temperature antifreeze liquid between the heat exchanger and the ice making means is provided. A low-temperature antifreeze and a high-temperature antifreeze can be selectively supplied to the ice making means,
Further, the ice making means is a harvest type ice making means, or the ice making means is an ice making heat exchanger, a spraying means for spraying water on the surface of the ice making heat exchanger, and the ice making heat exchange means. A heat storage tank for storing ice generated by the vessel and water sprayed to the ice making heat exchanger.

A third feature of the present invention to achieve the above object is that a refrigeration cycle formed by sequentially connecting a compressor, a condenser, expansion means, and an evaporator to a pipe, and a cooling cycle formed by the evaporator. An ice making means for exchanging heat with the low-temperature antifreeze liquid to produce ice, wherein a heat exchanger is provided between the condenser and the expansion means, and the heat exchanger flows through the refrigeration cycle in the heat exchanger. And a piping system for guiding the high-temperature antifreeze liquid that has undergone heat exchange with the cooling medium to the ice making means.

A fourth feature of the present invention for achieving the above object is that during the ice making operation, the high-temperature antifreeze liquid heated in the heat exchanger located between the condenser and the expansion means is stored in the high-temperature antifreeze liquid tank. In addition, the low-temperature antifreeze liquid that has exchanged heat with the refrigerant in the evaporator is guided to ice-making means to make ice, and during the deicing operation, the high-temperature antifreeze liquid is guided to the ice-making means and the low-temperature antifreeze liquid is prevented from flowing into the ice-making means.

A fifth feature of the present invention to achieve the above object is that in an ice heat storage system in which a plurality of ice making means are switched and used, the ice making means during the ice making operation is provided with a low temperature heat exchanged with a refrigerant by an evaporator. The antifreeze liquid is guided to make ice, and the high-temperature antifreeze liquid that has exchanged heat in the heat exchanger located between the condenser and the expansion means is guided to other ice making means during the deicing operation to perform deicing operation. The supply of the low-temperature antifreeze is stopped and the high-temperature antifreeze is supplied to the ice making means, and the supply of the high-temperature antifreeze is stopped to the other ice making means which has been deicing.

Preferably, in the fourth or fifth aspect, the ice making operation and the deicing operation are switched on the basis of the thickness of ice generated on the surface of the ice making device performing the ice making operation, or The ice making operation and the deicing operation are switched after the ice making device performing the ice making operation is deiced and based on the operation time from the start of ice making.

A sixth feature of the present invention to achieve the above object is that ice is made by flowing a low-temperature antifreeze liquid inside the ice making surface and flowing water outside the ice making surface, and the ice making amount reaches a predetermined value. Sometimes, in an ice heat storage system in which heated antifreeze is flown inside the ice making surface to separate ice from the ice making surface, the sensible heat of the condensate of the refrigerant flowing through the refrigeration cycle as a heat source for separating ice from the ice making surface is used. It is used.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an outline of an ice heat storage system according to the present invention. This ice thermal storage system
In addition to the normal refrigeration cycle, it has an ice heat storage unit for producing and melting ice. The high-pressure and high-temperature refrigerant gas compressed in the compressor 1 provided in the refrigeration cycle is condensed and liquefied in the condenser 2 and flows into the evaporator 5 via the heat exchanger 3 and the expansion valve 4. Then, it becomes a gas refrigerant and the compressor 1
Flows into. Thus, the refrigerant circulates through the refrigeration cycle.

Here, the evaporator 5 of this embodiment is a shell tube type heat exchanger in which a heat transfer tube is disposed in a shell, but is not limited to this. The refrigerant that has flowed into the evaporator 5 undergoes heat exchange with a low-temperature antifreeze, which will be described later, to be evaporated and gasified. In this gasification process, the low-temperature antifreeze flowing in the heat transfer tube or the shell side of the evaporator 5 is cooled to a predetermined temperature and used for ice making.

That is, during the ice making operation using the nighttime electric power, the ice heat storage section operates, and ice is stored in the heat storage layer. The ice heat storage unit includes a heat storage tank 7 in which water is stored, a water spray pump 8 for pumping water in the heat storage tank, and a water spray nozzle 9 for spraying water pumped by the water spray pump 8 to the heat exchanger 6 for making ice. And These are the same as those provided in a normal harvest type ice heat storage system.

The heat storage section and the refrigeration cycle are connected by an antifreeze pipe. That is, the low-temperature antifreeze flowing through the evaporator 5 is stored in the low-temperature antifreeze tank 10 and supplied to the ice making heat exchanger 6 by the pump 11. The heat exchanger 6 for making ice is formed such that water flows down the outer surface and the low-temperature antifreeze flows through the inside. The low-temperature antifreeze liquid that has exchanged heat with the ice-making water is returned to the evaporator 5 again.
It circulates in a circulation path constituted by the low-temperature antifreeze tank 10, the heat exchanger 6, and the evaporator 5.

Between the pump 11 and the heat exchanger 6 and between the heat exchanger 6
Between the evaporator 5 and the evaporator 5, a valve 14 and a valve 15 are provided, respectively. Further, a branch pipe is provided which branches off from the heat exchanger 6 side with respect to the valves 14 and 15. Then, a high-temperature antifreeze is caused to flow through the branch pipe and the heat exchanger 3 connected thereto, thereby forming a high-temperature antifreeze circulation circuit in the heat storage unit. This is one of the features of the present invention. That is, the heat exchanger 6 for ice making and the heat exchanger 3 are connected to each other via the valve 17 and connected to the valve 1 of the connection pipe.
A branch pipe further branched from between the heat exchanger 7 and the heat exchanger 3 is provided so as to join between the valve 14 and the heat exchanger 6 in the pipe line through which the low-temperature antifreeze flows. The high-temperature antifreeze which has been heated to a high temperature in the heat exchanger 3 is stored in the high-temperature antifreeze tank 12. During ice making, the high-temperature antifreeze stored in the high-temperature antifreeze tank 12 is guided to the heat exchanger 3 by the pump 13, and the high-temperature antifreeze is heated by the heat exchanger 3. It is guided to the high-temperature antifreeze tank 12 and circulated. On the other hand, at the time of deicing, the pump 13 pumps up the high-temperature antifreeze stored in the high-temperature antifreeze tank 12 and guides it to the ice-making heat exchanger 6.

The state of each valve during ice making and deicing is as follows. At the time of ice-making, the valves 14 and 15 are fully opened so that the low-temperature antifreeze flows into the ice-making heat exchanger 6. At the same time, the valves 16 and 17 are fully closed to prevent the low-temperature antifreeze from flowing into the heat exchanger 3 and the high-temperature antifreeze from flowing into the ice-making heat exchanger 6. Further, the valve 18 is fully opened so that the high-temperature antifreeze circulates between the heat exchanger 3 and the high-temperature antifreeze tank 12. The low-temperature antifreeze tank 10 and the high-temperature antifreeze tank 12 are provided with valves 19 and 20 for removing air, respectively, to prevent air from remaining in the antifreeze pipe.

When the ice making amount of the ice making heat exchanger 6 reaches the set value, the operation is switched from the ice making operation to the deicing operation, and the ice is made from the ice making surface of the ice making heat exchanger 6. This switching is performed when the operation time required for ice making reaches a predetermined time, when the temperature of the high-temperature antifreeze or the low-temperature antifreeze reaches the predetermined temperature, when the thickness of the ice reaches the predetermined temperature, or the like. During deicing, the valves 14 and 15 are fully closed to prevent the low-temperature antifreeze from flowing to the ice making heat exchanger 6. Further, the valve 18 is closed,
By fully opening the valves 16 and 17, the high-temperature antifreeze stored in the high-temperature antifreeze tank 12 during ice making is guided to the ice making heat exchanger 6. It is to be noted that a method of performing deicing over the entire surface of the ice making heat exchanger 6 and a method of dividing the ice making surface into several parts and sequentially removing the surface are considered. Next, the former method will be described below.

An example in which the compressor 1 is stopped and deicing is performed will be described with reference to FIG. When a thickness sensor (not shown) detects that the ice making amount has reached the set value, a control device (not shown) stops the compressor 1. Then, after a predetermined time elapses after the compressor 1 is stopped, the low-temperature antifreeze liquid pump 11 is stopped. Next, the valves 14, 15, and 18 are fully closed, and the valves 16 and 17 are fully opened. In this state, the high temperature antifreeze pump 13 is operated. The high-temperature antifreeze stored in the high-temperature antifreeze tank 12 flows into the ice-making heat exchanger 6 and heats the ice-making surface from the inside. Thereby, the ice generated on the ice making surface is separated from the ice making surface. When the deicing is completed, the valves 14, 15, and 18 are opened, the valves 16 and 17 are fully closed, and then the compressor 1 is operated to repeat the ice making operation.

According to the present embodiment, the refrigeration cycle is supercooled during ice making to generate heat, and the heat is used to heat the high-temperature antifreeze, so that a new method such as the hot gas method or the heater is used. There is no need to use a lot of energy. Therefore, it becomes possible to use high-temperature antifreeze during deicing,
Energy efficiency is improved. The device for supercooling is a conventional heat exchanger, which is relatively simple, does not cause a significant increase in cost, and is more reliable. Furthermore, the efficiency of the refrigeration cycle is improved because the refrigerant is supercooled.

In the present embodiment, deicing is performed from the ice making surface by utilizing the sensible heat of the condensate in the refrigeration cycle.
Less wasted energy. That is, a heat exchanger for exchanging heat between the condensate and the antifreeze is provided, and during the ice making operation, the low-temperature antifreeze is flowed inside the ice making surface to make ice. On the other hand, the heat exchanger is connected to a high-temperature line composed of a high-temperature antifreeze tank, a pipe, and a pump separated from a low-temperature antifreeze pipe by a switching valve, and the pump is operated to heat the antifreeze. Further, since the condensed liquid is cooled, latent heat of evaporation of the condensed liquid increases, and an efficient heat storage operation can be performed. Further, when deicing after the ice making is completed, the valve of the antifreeze liquid pipe is switched to connect the high temperature antifreeze liquid line and the ice making heat exchanger, so that the high temperature antifreeze liquid can be supplied to the ice making heat exchanger. Thus, the ice on the ice making surface can be efficiently separated without wasting energy.

In the above embodiment, it is desirable to provide the low-temperature antifreeze tank 10 at a position lower than the ice making heat exchanger 6. If the ice heat storage system is configured in this way, the high-temperature antifreeze tank holding the high-temperature antifreeze and the low-temperature antifreeze tank are provided separately, so that the time for deicing is shortened, and the ice making operation is switched to the deicing operation. When you switch to
The low-temperature antifreeze liquid filled in the ice making heat exchanger is efficient,
The effect of being collected in the low-temperature antifreeze tank also occurs. For this reason, when switching to the high-temperature antifreeze, only a small amount of the low-temperature antifreeze remains inside the heat exchanger for ice making, and deicing can be performed efficiently and in a short time.

Next, another embodiment of the present invention, in which a plurality of divided ice making heat exchanges are switched by an automatic valve to perform ice making for each block while continuing ice making, with reference to FIG. explain. In FIG. 2, two heat exchangers 6, 6a for ice making are connected.
Are provided. 2, the same components as those in FIG. 1 are denoted by the same reference numerals.

In FIG. 2, in addition to the same components as the ice heat storage unit shown in FIG. 1, another ice generation unit is provided. That is, a pipe for guiding the low-temperature antifreeze to the heat exchanger 6a for making ice and a pipe for returning from the heat exchanger 6a are provided in a branched manner.
Valves 14a and 15a are provided in the branch pipe. Further, a pump 8a for supplying water from the heat storage layer 7a to the heat exchanger 6a for ice making, and a water spray nozzle 9a located above the heat exchanger 6a and spraying water to the heat exchanger 6a are also provided. Further, a pipe line for guiding the high-temperature antifreeze liquid stored in the high-temperature antifreeze liquid tank 12 to the ice-making heat exchanger 6a at the time of deicing is provided, and valves 16a and 17a are provided in this pipe line.

Next, the operation of the valve and the like in the present embodiment configured as described above will be described. Before starting the ice making operation of the first ice generating unit, the valves 14 and 15 are opened and the valves 14a and 15a are closed to allow the low-temperature antifreeze to flow to the first ice generating unit, and the second ice The flow of the low-temperature antifreeze is made impossible to the generation unit. In addition, the valves 16 and 17 are closed, and the valves 16a and 17a are opened to disable the flow of the high-temperature antifreeze to the first ice generator and the flow of the high-temperature antifreeze to the second ice generator. To In this state, the compressor 1 is operated, and the pump 11 and the pump 13 are also operated. further,
When the watering pump 8 is operated, the low-temperature antifreeze is supplied to the heat exchanger 6 for ice making, and ice is made on the ice making surface of the heat exchanger 6.

On the other hand, a high-temperature antifreeze solution is supplied to the ice making surface of the heat exchanger 6a for making ice, and the ice making surface of the heat exchanger 6a is heated. The ice generated on the ice making surface of the heat exchanger 6a separates and falls into the heat storage tank 7a. Like this
Deicing of the ice making surface of the ice making heat exchanger 6a is completed, and
When the amount of ice generated on the ice making surface of the ice making heat exchanger 6 reaches a set value, each valve is switched. Specifically, the valves 14 and 15 are closed, the valves 14a and 15a are opened, and the first
Of the low-temperature antifreeze to the second ice generating unit and the low-temperature antifreeze to the second ice generating unit. Further, the valves 16 and 17 are opened, the valves 16a and 17a are closed, and the high-temperature antifreeze is allowed to flow to the first ice generator, and the flow of the high-temperature antifreeze to the second ice generator is disabled. Then, the water spray pump 8a is operated to make ice on the surface of the heat exchanger 6a for making ice, while deicing the ice generated on the surface of the heat exchanger 6 for making ice. Thereafter, by sequentially switching the valves, the first heat exchanger 6 for ice making and the second heat exchanger 6a for ice making can alternately make ice, and ice can be made continuously.

According to this embodiment, in addition to the effects of the first embodiment, since the ice making surface is divided into a plurality of parts and each ice making surface is sequentially deiced, the ice separated from the ice making surface can be separated from each other. There is also an advantage that the collision can be prevented and the ice making surface can be prevented from being damaged, and since a large amount of heat of melting is not required at one time, the capacity of the pump 13 can be reduced.

In any of the above embodiments, the heat exchanger 3 may be provided between the compressor 1 and the condenser 2. In this case, the efficiency of the refrigeration cycle cannot be improved by supercooling. However, since the high-temperature refrigerant that has exited the compressor can be used for heating the high-temperature antifreeze, the heat exchanger 3 can be downsized. Another advantage is that the energy discarded by the condenser is effectively used.

If a non-chlorine-based refrigerant or a non-azeotropic mixed refrigerant is used as the refrigerant, it is friendly to the global environment and can prevent environmental pollution. As such a refrigerant, for example, R407
C and R410.

In each of the above embodiments, the high-temperature antifreeze and the low-temperature antifreeze are of the same type, but the high-temperature antifreeze and the low-temperature antifreeze may be of different types. However, in this case, it is necessary to draw the inside of the ice making heat exchanger with a pump or the like so that each liquid is completely removed from the inside of the ice making heat exchanger when switching from the high temperature anti-freezing solution to the low temperature anti-freezing solution.

Next, a specific example of the above-described embodiment of the present invention will be described with reference to the Mollier diagram shown in FIG. The horizontal axis of the figure is enthalpy I, and the vertical axis is pressure p. The state on the suction side of the compressor 1 used in the refrigeration cycle is indicated by A in the circle. At the outlet of the compressor 1, both the pressure and the enthalpy rise to the point of B in the circle. In the heat exchanger 2 acting as a condenser, the enthalpy changes from point B to point C. When there is no heat exchanger 3 with the high-temperature antifreeze, the pressure in the expansion valve 4 changes from the point C to the point D. On the other hand, when the heat exchanger 3 with the high-temperature antifreeze is provided, the refrigerant is supercooled in this heat exchanger 3, and the enthalpy changes from the point C to the point E. And expansion valve 4
Then, the pressure drops from the point E to the point F, and the enthalpy increases from the point F to the point A in the heat exchanger 5 which is an evaporator.

As an example, a refrigeration cycle using refrigerant R-22 will be described. In a refrigeration cycle in which the evaporation temperature of the refrigerant is -10 ° C and the condensing temperature is 37 ° C, the heat exchanger 3 is provided to supercool the condensed liquid to 25 ° C.
Is compared with the case where no is provided.

Assuming that the mass flow rate of the refrigerant is G and the enthalpy difference before and after the evaporator is Δi, when the heat exchanger 3 is not provided, Q = G × ΔI = G × (I _A− I _D ) = G × (148.173-110.92)
7) On the other hand, since the supercooling and providing the heat exchanger 3, Q = G × ΔI = G × (I A -I F) = G × (148.173-107.24
7) Therefore, the ratio of the amount of heat of evaporation of the evaporator is 1.10, which is increased by about 10% due to supercooling. This shows that the efficiency of the refrigeration cycle is improved.

[0038]

As described above, according to the present invention, since the sensible heat of the condensate is used as a heat source for heating the antifreeze for deicing, an extra heat source is not required, and Heat loss is small. On the other hand, the efficiency of the refrigeration cycle is improved because supercooling is used in the refrigeration cycle. Furthermore, the high-temperature gas compressed by the compressor is
Since it is not used for detachment of ice, it is possible to prevent the compressor and, consequently, the cycle from becoming larger.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of one embodiment of a heat storage system according to the present invention, illustrating an ice making cycle.

FIG. 2 is a schematic diagram of one embodiment of a heat storage system according to the present invention, for illustrating a deicing cycle.

FIG. 3 is a Mollier chart for explaining the principle of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Condenser, 3 ... Heat exchanger, 4 ... Expansion valve,
5 evaporator, 6 heat exchanger for ice making, 7 heat storage tank, 8 ...
Watering pump, 9 ... watering nozzle, 10 ... low-temperature antifreeze tank, 1
DESCRIPTION OF SYMBOLS 1 ... Pump, 12 ... High temperature antifreeze tank, 13 ... Pump, 14
... Valve, 15 ... Valve, 16 ... Valve, 17 ... Valve, 18 ... Valve, 19 ... Air release valve, 20 ... Air release valve.

Claims (12)

[Claims] 1. An ice heat storage system having a refrigeration cycle formed by sequentially connecting a compressor, a condenser, an expansion means, and an evaporator with pipes, and an ice making means, wherein the refrigeration cycle is obtained by an evaporator. Ice, wherein the low-temperature antifreeze and a high-temperature antifreeze obtained by a heat exchanger provided between the compressor and the condenser or between the condenser and the expansion means are selectively passed through the ice making means. Thermal storage system. 2. A refrigeration cycle formed by sequentially connecting a compressor, a condenser, an expansion means, and an evaporator with a pipe, and a low-temperature antifreeze that exchanges heat with cold generated by the evaporator to exchange ice with ice. In the ice heat storage system comprising an ice making means for generating, a heat exchanger is provided between the condenser and the expansion means, and in this heat exchanger, a high-temperature antifreeze liquid that has exchanged heat with a refrigerant flowing in a refrigeration cycle, An ice heat storage system, wherein a piping system leading to the ice making means is provided. 3. The ice heat storage system according to claim 1, wherein the heat exchanger supercools the refrigerant. 4. A first valve for controlling the flow of low-temperature antifreeze between the evaporator and the ice making means, a valve for controlling the flow of high-temperature antifreeze between the heat exchanger and the ice making means. 4. The ice heat storage system according to claim 1, wherein a low-temperature antifreeze and a high-temperature antifreeze are selectively supplied to the ice making means. 5. The ice heat storage system according to claim 1, wherein said ice making means is a harvest type ice making means. 6. The ice making means includes: an ice making heat exchanger; a spraying means for spraying water on a surface of the ice making heat exchanger; and ice exchange with ice generated by the ice making heat exchanger. The ice heat storage system according to any one of claims 1 to 4, further comprising a heat storage tank for storing water sprayed on the vessel. 7. A refrigeration cycle formed by sequentially connecting a compressor, a condenser, an expansion means, and an evaporator to a pipe, and ice making means for generating heat by exchanging heat with a low-temperature antifreeze cooled by the evaporator. An ice heat storage system comprising: a heat exchanger provided between the condenser and the expansion means, wherein the high-temperature antifreeze liquid that has been heat-exchanged with a refrigerant flowing through a refrigeration cycle in the heat exchanger is used as the ice making means. An ice heat storage system characterized by providing a piping system leading to the ice. 8. During the ice making operation, the heat exchanger located between the condenser and the expansion means exchanges heat with the refrigerant flowing through the condenser and stores the heated high-temperature antifreeze in the high-temperature antifreeze tank while evaporating. An ice storage unit that guides the low-temperature antifreeze liquid that has exchanged heat with the refrigerant to the ice-making means to make ice, guides the high-temperature antifreeze liquid to the ice-making means during deicing operation, and prevents the low-temperature antifreeze liquid from flowing into the ice-making means. system. 9. An ice heat storage system in which a plurality of ice making means are switched and used, and ice is made by introducing a low-temperature antifreeze liquid which has exchanged heat with a refrigerant in an evaporator to the ice making means during the ice making operation. The high-temperature antifreeze liquid that has exchanged heat in the heat exchanger located in between is guided to another ice making means during the deicing operation to perform deicing operation, and thereafter, the supply of the low-temperature antifreeze liquid to the ice making means that was performing the ice making operation is stopped. And supplying the high-temperature antifreeze to the other ice making means that has been performing the deicing operation. 10. The ice heat storage according to claim 8, wherein the ice making operation and the deicing operation are switched based on the thickness of ice generated on the surface of the ice making device that is performing the ice making operation. system. 11. The ice making operation and the deicing operation are switched based on the operation time from the start of ice making after the ice making device performing the ice making operation is deiced. 10. The ice heat storage system according to 9. 12. A low-temperature antifreeze solution is flown inside the ice making surface and water is flown outside the ice making surface to make ice. When the amount of ice making reaches a predetermined value, the heated antifreeze solution is flown inside the ice making surface. An ice heat storage system for separating ice from an ice making surface, wherein sensible heat of a condensate of a refrigerant flowing in a refrigeration cycle is used as a heat source for separating ice from the ice making surface.