JPH11281275A - Ice heat storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable sufficient storing of ice into all ice heat storage tanks even when a plurality of ice heat storage tanks with different capacities are installed. SOLUTION: In this ice heat storage system, a thawing cooling operation is performed utilizing ice stored in ice heat storage tanks 133 and 134 by ice making operation. In this case, a plurality of ice heat storage tanks 133 and 134 capable of simultaneous operation of making ice are arranged with different capacities and ice making forbidding means 136a and 136b are provided to forbid the making of ice in the small-capacity ice heat storage tank 134 when the amount of ice stored in the small-capacity ice heat storage tank 134 reaches a specified value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ice heat storage tank,
The present invention relates to an ice heat storage system that enables an ice heat storage operation using the ice heat storage of the ice heat storage tank.

[0002]

2. Description of the Related Art Generally, a low-temperature cooling system constituted by connecting a plurality of low-temperature showcases or the like to a refrigerator via a refrigerant pipe in parallel, a supercooling heat exchanger connected to the refrigerant pipe, Heat storage comprising a heat storage heat exchanger connected to a heat storage refrigerant pipe connected to a heat exchanger, a supercooling heat exchanger, and an ice heat storage tank connected to the heat storage heat exchanger via a brine pipe. Systems are known.

[0003]

In this type, it is proposed to connect a plurality of ice storage tanks in parallel to a brine pipe when a large ice making capacity is required.

When ice is stored in an ice heat storage tank, ice can be stored only up to, for example, about 95% due to the structure of the ice heat storage tank. Therefore, if the ice heat storage tank connected to the brine pipe is an ice heat storage tank having the same capacity, the ice making operation may be stopped when the ice is stored up to about 95%.

However, when a plurality of ice storage tanks having different capacities are connected in parallel, even if the ice storage capacity of the small capacity ice storage tank reaches 95%, the ice storage capacity of the large capacity ice storage tank becomes 95%. %, And if the ice making operation is stopped at this stage, there is a problem that the ice storage amount of the entire system becomes insufficient.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide an ice storage tank which can store ice in all ice storage tanks even if a plurality of ice storage tanks having different capacities are provided. It is to provide a heat storage system.

[0007]

According to the first aspect of the present invention, a simultaneous ice making operation is possible in an ice heat storage system that performs an ice melting cooling operation using ice stored in an ice heat storage tank by the ice making operation. A plurality of ice heat storage tanks having different capacities are provided, and ice making prohibition means for prohibiting ice making in the small-capacity ice heat storage tank when the amount of ice stored in the small-capacity ice heat storage tank reaches a predetermined amount is provided. Is what you do.

According to a second aspect of the present invention, there is provided a low-temperature cooling system comprising a refrigerator and a plurality of low-temperature showcases connected in parallel by a refrigerant pipe, and a supercooling heat exchange connected to the refrigerant pipe. And a heat storage heat exchanger connected to the refrigerator by a refrigerant pipe, and a plurality of ice heat storage tanks having different capacities connected to the supercooling heat exchanger and the heat storage heat exchanger by brine piping. And an ice making prohibition means for prohibiting ice making in the small-capacity ice heat storage tank when the amount of ice stored in the small-capacity ice heat storage tank reaches a predetermined amount.

According to a third aspect of the present invention, there is provided a refrigeration system comprising a plurality of refrigeration showcases and the like connected in parallel by a first refrigerant pipe to one refrigeration refrigerator, and one refrigeration refrigeration system. A refrigeration system configured by connecting a plurality of cold building showcases and the like to the machine in parallel by a second refrigerant pipe, and a first supercooling heat exchanger connected to the first refrigerant pipe, A second supercooling heat exchanger connected to the second refrigerant pipe, and a heat storage heat exchanger connected to either the refrigeration refrigerator or the refrigeration refrigerator by a third refrigerant pipe. A plurality of ice heat storage tanks having different capacities connected to the first subcooling heat exchanger, the second subcooling heat exchanger and the heat storage heat exchanger by brine piping, and having a small capacity. When the amount of ice stored in the ice storage tank reaches a predetermined amount, ice making to the small-capacity ice storage tank is prohibited. It is characterized in the provision of the ice inhibiting means.

In these inventions, when the amount of ice stored in the small-capacity ice heat storage tank reaches, for example, 95%, ice making in the small-capacity ice heat storage tank is prohibited, and the ice storage in the large-capacity ice heat storage tank is continuously performed. Since the ice making operation is performed, ice is sufficiently stored in all the ice storage tanks.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, A indicates a refrigeration system, and B indicates a refrigeration system. Refrigeration system A has a capacity of 65
Refrigeration refrigerator 101 having a capacity of about 95 to 95 hp.
3b is connected. The first refrigerant pipe 103a forms a liquid pipe, and the first refrigerant pipe 103b forms a gas pipe. A plurality of refrigerated showcases 105 and a plurality of prefabricated refrigerators 10 are provided in these first refrigerant pipes 103a and 103b.
7 are connected in parallel. 109 is an expansion valve.
The refrigeration system B includes one refrigeration refrigerator 111 having a capacity of about 65 to 95 hp, and the second refrigerant pipes 113a and 113b are connected to the refrigeration refrigerator 111. The second refrigerant pipe 113a constitutes a liquid pipe, and the second refrigerant pipe 11a
3b constitutes a gas pipe. These second refrigerant pipes 11
A plurality of freezer showcases 115 and one large prefabricated freezer 117 are connected in parallel to 3a and 113b. 119 is an expansion valve.

First refrigerant pipe (liquid pipe) 1 of refrigeration system A
03a is connected to the first supercooling heat exchanger 121,
The second subcooling heat exchanger 123 is connected to the second refrigerant pipe (liquid pipe) 113a of the refrigeration system B.

A refrigerant pipe (gas pipe) 12 of third refrigerant pipes 125a and 125b (constituting a "heat storage refrigerant pipe") connected to the refrigerator 101 of the refrigeration system A.
A heat storage heat exchanger 127 is connected to 5b, and an expansion valve 129 is connected to the refrigerant pipe (liquid pipe) 125a.

The ice heat storage tank 133 is connected to the first supercooling heat exchanger 121, the second supercooling heat exchanger 123, and the heat storage heat exchanger 127 via brine pipes 131a to 131g.
Is connected, and the brine pipe 13 is connected in parallel with the ice heat storage tank 133.
An ice heat storage tank 134 having a smaller capacity than the ice heat storage tank 133 is connected through 1h and 131i.
Opening / closing valves 136a and 136b (ice making inhibiting means) are connected to h and 131i, respectively. 135 is a brine pump and 137 is a three-way valve.

FIG. 2 shows the structure of the refrigerator 101 for refrigeration. Since the refrigerator 111 has the same configuration,
Description is omitted.

In this refrigerator 101, one 15 horsepower unit and two
A total of four (75 hp) compressors 20a to 20 (three 0 hp)
d are arranged in parallel, and two are connected by a common pipe. That is, the refrigerant pipes 22a and 22b connected via the mufflers 21a and 21b to the discharge pipes of the first compressor 20a and the second compressor 20b join on the way, and the oil separators for the first and second compressors. (Oil separator) is connected to 23a. Similarly, the third compressor 20c and the fourth compressor 20d
Refrigerant pipes 22c and 22d connected via mufflers 21c and 21d to the discharge pipe of No. 1 join in the middle, and connected to an oil separator 23b for the third and fourth compressors. Further, refrigerant pipes 24a and 24b connected to the suction pipes of the first compressor 20a and the second compressor 20b merge on the way, and accumulators (gas-liquid separators) 25 for the first and second compressors.
a. Similarly, the third compressor 20c and the fourth
Refrigerant pipes 24c, 24 connected to the suction pipe of the compressor 20d
d merges on the way and is connected to the accumulators 25b for the third and fourth compressors. Each compressor 20a-20d
Service valves 26a to 26 for maintenance
d, 27a to 27d are connected.

The refrigerant pipes 28a and 28b that have come out of the oil separators 23a and 23b are joined to provide a total of three sets of two, each of which is an air-cooled condenser (compressor) 30a to 30f by a plurality of fans 29. It is connected to the.
Service valves 31a to 31c are connected to the input side of each of the capacitors 30a to 30f for each unit, and service valves 32a to 32f are individually connected to the output side. On one side of the output of each unit, high-pressure switches 33a to 33 for backup of the temperature sensor for controlling the fan motor are provided.
c is attached. Each capacitor 30a-30f
The refrigerant pipes that have exited from each other merge into a receiver tank (liquid receiver) 34.
It is connected to the. Service valves 35 and 36 are connected to the inlet and outlet sides of the refrigerant pipe of the receiver tank 34, and a high-pressure manometer is provided via a safety valve 37, a fusible plug 38, and a check valve 38 and a capillary tube 39. 40 are attached.

The refrigerant pipe that has exited the receiver tank 34 is passed through a filter dryer 41 and a moisture indicator 42 to serve as a first refrigerant pipe (liquid pipe) 103a.
The liquid solenoid valve 1 is drawn out and, as shown in FIG.
09 to each of the showcases 105 and the refrigerator 107.

The refrigerant pipes from each of the showcases 105 and the refrigerator 107 merge to form the first refrigerant pipe 103b and enter the refrigerator 101, where the accumulators 25a for the first and second compressors are connected to the third and third accumulators. Accumulator 25b for 4 compressors
And connected to. A service stop valve 46 is connected to the first refrigerant pipe 103b, and a low-pressure manometer 47,
A low pressure switch 48a for the first and second compressors and a low pressure switch 48b for the third and fourth compressors are attached.

Low pressure switch 4 for first and second compressors
8a and low pressure switch 48b for the third and fourth compressors
Are digital pressure switches that can set two different types of ON / OFF pressures, respectively.
It is provided for capacity control of 20d. That is, the four low-pressure switches 48a and 48b are different from each other.
Various ON / OFF pressures can be set, and a wide range of capacity control from one compressor operation to four compressor operations is possible.

On the other hand, the refrigerant pipe 49a coming out of the accumulator 25a for the first and second compressors is branched to the first compressor 2a.
0a and a refrigerant pipe 49 connected to the suction pipe of the second compressor 20b and coming out of the accumulator 25b for the third and fourth compressors.
b is branched and connected to the suction pipes of the third compressor 20c and the fourth compressor 20d.

The high-pressure liquid pipe 43 downstream of the moisture indicator 42 is supplied with high-pressure liquid refrigerant by each of the compressors 20a to 20a.
A liquid injection pipe (L / I pipe) 50 for cooling each of the compressors 20a to 20d by the heat of evaporation by returning it to 20d and evaporating it is connected. The L / I pipe 50 is branched into four pipes for each compressor on the way, and each of the service stop valves 51a to 51d,
Each of the compressors 20a to 20d is connected via solenoid valves 52a to 52d and capillary tubes 53a to 53d for evaporation under reduced pressure.
d is connected to the low pressure side.

First and second compressor oil separators 23
a and an oil tank 54 for storing the separated lubricating oil.
Is connected. Service valves 55 and 56 are connected to the inlet and outlet sides of the oil tank 54. The pipe connected to the service valve 56 at the outlet of the oil tank is branched in the middle into four pipes for each compressor, and the stop valves 57a to 47d for service and the oil regulators 58a to 58d are respectively provided.
The compressor is connected to each of the compressors 20a to 20d via 58d. The oil tank 54 is connected to the first refrigerant pipe 103b via an oil tank equalizing pipe service valve 59.

The high and low pressure switches 60a to 60d for detecting the abnormally high or low pressure and protecting the compressors 20a to 20d are connected to the high and low pressure sides of the compressors 20a to 20d, respectively. They are connected via stabilizing capillary tubes 61a to 61d.

In the refrigerator 101, since a service valve is provided at a main part of the refrigerant pipe, even if a leak occurs in a part of the refrigerant pipe, the service valve can be closed and repaired while the refrigerator 101 is operated. it can. Therefore, it is not necessary to stop the entire system for a part of the repair, and the maintainability is improved.

The refrigerator 101 is installed outdoors, and the first refrigerant pipes 103a and 103b extend into a store such as a supermarket as shown in FIG. It is connected.

In this case, the installation work of the 101 refrigerators and the piping work are completed, so that the installation work can be simplified.

This refrigerator 101 has four compressors 20a.
As described above, the capacity control operation is automatically performed by the first and second compressor low-pressure switches 48a and the third and fourth compressor low-pressure switches 48b.

The high-pressure and high-temperature refrigerants compressed by the compressors 20a to 20d join together, and the lubricating oil mixed with the refrigerant is separated by the oil separators 23a and 23b. The separated lubricating oil is temporarily stored in the oil tank 54, Compressor 20a as required by the operation of oil regulators 58a to 58d.
２０20d.

The high-pressure and high-temperature refrigerant having passed through the oil separators 23a and 23b merges with the air-cooled condenser 30a.
-30 f, and is condensed and liquefied by forced air cooling by the fan 29, and is stored in the receiver tank 34.

From the receiver tank 34, high-pressure liquid refrigerant is supplied stably to the showcase 105 and the refrigerator 107 connected to the refrigerator 101 via a filter dryer 41 and a moisture indicator 42. The high-pressure liquid refrigerant supplied to the showcase 105 and the refrigerator 107 is decompressed and expanded by passing through the expansion valve, and is supplied to an evaporator (evaporator).

In the evaporator, the inside of the refrigerator is cooled by the heat of vaporization of the liquid refrigerant that has been decompressed and expanded, and is maintained at a cooling temperature corresponding to the heat exchange efficiency.

The refrigerant gas which has been cooled to a low pressure by cooling the showcase 105 and the refrigerator 107 passes through a refrigerant pipe to the refrigerator 10.
1 is returned to the first refrigerant pipe 103b, and the accumulator 2
After gas-liquid separation through 5a and 25b, only the gas component is returned to each of the compressors 20a to 20d to be recompressed, and the above refrigeration cycle is repeated.

During this time, each of the compressors 20a to 20d is operated by the first and second compressor low-pressure switches 4 according to the load fluctuations of the showcase 105 and the refrigerator 107 at the opening and closing shops and day and night.
8a and the third and fourth compressor low-pressure switches 48b automatically perform a displacement control operation. Therefore, the refrigerator 101
Is maintained at the minimum output required to maintain the required cooling temperature of the showcase 105 and the refrigerator 107.

Next, the operation of this embodiment will be described with reference to FIG.

(A) Ice making For example, during the time when the electricity rate is low from 10:00 at night to 8:00 in the next morning, the refrigeration refrigerator 101 is operated to open and close the on-off valve 1.
43, the refrigerant is circulated through the third refrigerant pipes 125a and 125b in the direction of the dotted arrows, and the brine pump 1
35 to operate the brine pipes 131f, 131g, 1
The brine is circulated in the directions indicated by the dotted arrows 31e and 131a. In this case, the on-off valves 136a and 136b are opened,
The brine is also circulated through the brine pipes 131h and 131i.

Then, heat is exchanged in the heat storage heat exchanger 127, and the brine is cooled by the refrigerant, so that ice is stored in the ice heat storage tanks 133 and 134 and ice is stored. When storing ice in the ice heat storage tanks 133 and 134,
Due to the structure of 134, for example, ice can be stored only up to about 95% of its capacity.

In this embodiment, a small-capacity ice heat storage tank 13 is used.
When the amount of ice stored in the storage tank 4 reaches, for example, 95%, the on-off valves 136a and 136b (ice making prohibition means) are first closed, the circulation of the brine to the brine pipes 131h and 131i is stopped, and the small-capacity ice storage tank 134 Ice making is prohibited.
Then, ice making to the large-capacity ice heat storage tank 133 is continued, and the ice storage amount of the large-capacity ice heat storage tank 133 becomes, for example, 95%.
%, The ice making operation is stopped. Opening and closing of the on-off valves 136a and 136b (ice making prohibition means)
The controller is in charge of the output from an ice making rate meter (not shown) or the like. According to this, the ice storage amount of the entire system does not become insufficient.

If the ice heat storage tank 134 connected to the brine pipes 131h and 131i has the same capacity as the ice heat storage tank 133, the ice storage time is about 95%, for example. Once the ice is stored, the ice making operation may be stopped. In this case, the on-off valves 136a, 136
b (ice making prohibition means) is unnecessary.

As another embodiment, as shown in FIG.
Ice storage tanks 23 of different capacities for the brine pipe 231
3,234 can be connected in series.

In this case, open / close valves 236 a and 236 b are provided at the entrance and exit of the small-capacity ice heat storage tank 234, respectively, and when the open / close valve 236 a on the inlet side is closed, the brine flows into the ice heat storage tank 233. Is provided with an on-off valve 238.

In this embodiment, first, two on-off valves 23
6a and 236b are opened, and the on-off valve 2 of the bypass pipe 237 is opened.
38 is closed, and brine is flowed in series to the ice heat storage tanks 233 and 234. Next, when the amount of ice stored in the small-capacity ice thermal storage tank 234 reaches, for example, 95%, the on-off valve 236a,
236b (ice making prohibition means) is closed, and ice making to the small capacity ice heat storage tank 234 is prohibited. At the same time, the on-off valve 238 of the bypass pipe 237 is opened, and this bypass pipe 2
The ice making to the large-capacity ice storage tank 233 is continued through 37, and the amount of ice stored in the large-capacity ice storage tank 233 is, for example, 95%.
%, The ice making operation is stopped. According to this, the ice storage amount of the entire system does not become insufficient.

(B) Thawing During the business hours of a store where low-temperature showcases are installed,
The supercooling operation using the ice heat storage using the ice heat storage in the ice heat storage tank 133 is performed to improve the refrigeration capacity of the systems A and B. In the refrigeration system A, the refrigeration refrigerator 101 is operated, the on-off valve 143 is closed, and the first refrigerant pipes 103a, 103a, 1
03b, the refrigerant is circulated in the direction of the solid arrow, and in the refrigeration system B, the refrigeration refrigerator 111 is operated,
The refrigerant is circulated through the second refrigerant pipes 113a and 113b in the direction of the solid arrow. Then, the brine pump 135 is operated to operate the brine pipes 131b, 131c, 131d, 13d.
The brine is circulated through 1e and 131a in the direction of the solid arrow.

Then, heat exchange is performed in the first supercooling heat exchanger 121, and the liquid refrigerant flowing through the first refrigerant pipe 103a is supercooled (subcooled) by the brine circulating through the brine pipe. Thereby, the refrigerating capacity of the refrigeration system A is improved. In addition, heat exchange is performed in the second subcooling heat exchanger 123, and the liquid refrigerant flowing through the second refrigerant pipe 113a is subcooled by the brine circulating through the brine pipe. Ability is improved.

During this operation, heat is applied to the brine, ice is made in the ice storage tank 133, and the ice stored therein is gradually thawed with the passage of time.

At this time, the amount of deicing can be controlled by inverter-controlling the brine pump 135. For example, effective use of ice can be achieved by controlling to use up all of the ice during the day, or by controlling the amount of ice to be melted every hour to be equal. Even if all the ice is used up, 95% of the ice can be stored in the ice thermal storage tank at night, thereby improving the efficiency of the entire system.

FIG. 4 shows a refrigeration circuit according to another embodiment.

The difference from FIG. 1 is that, as in FIG.
The two ice heat storage tanks 133 and 134 are connected in series, and the mixing three-way valve 151 is arranged between the ice heat storage tank 233 and the brine pump 135. A brine pipe 152a is connected to the mixing three-way valve 151, and the brine pipe 152a bypasses the brine flowing through the brine pipe 131e. That is, a part of the brine that has returned through the brine pipe 131e and the brine that flows out of the ice heat storage tank 233 are mixed with the three-way mixing valve 15.
1 for mixing. By controlling the mixing ratio, the amount of thawing in the ice heat storage tank can be controlled without performing inverter control on the brine pump 135, and effective use of ice can be achieved.

As shown in FIG. 4, a first supercooling heat exchanger 121, a second supercooling heat exchanger 123, a heat storage heat exchanger 127, and ice heat storage tanks 233 and 234 are imagined. As shown by the line, it is possible to store in one ice heat storage controller C.

In this embodiment, the ice heat storage tanks 133, 13
4 etc. are stored in one ice thermal storage controller C,
Installation space is reduced, and installation work becomes easier.

At this time, a smaller unit configuration may be adopted depending on installation conditions and the like. For example, as shown in FIG. 1, an ice storage controller C including a first and second subcooling heat exchanger, a heat storage heat exchanger, a three-way valve, and the like, a brine pump and an ice storage tank unit (ice storage tank). May be subdivided by the number of times.), The installation space can be reduced, and the installation work can be facilitated.

Although the present invention has been described based on one embodiment, it is apparent that the present invention is not limited to this.

For example, the heat storage heat exchanger 127 is a refrigerant pipe (gas pipe) 125b of the third refrigerant pipes 125a and 125b connected to the refrigeration refrigerator 101 of the refrigeration system A.
Is connected to the refrigeration system B.

[0055]

According to these inventions, when the amount of ice stored in the small-capacity ice thermal storage tank reaches, for example, 95%, ice making to the small-capacity ice thermal storage tank is prohibited, and the large-capacity ice thermal storage tank is continued. Since the ice making operation is performed, the ice is sufficiently stored in all the ice storage tanks.

[Brief description of the drawings]

FIG. 1 is a circuit diagram illustrating a configuration of an embodiment of the present invention.

FIG. 2 is a refrigerant circuit diagram of the refrigerator.

FIG. 3 is a connection circuit diagram of an ice heat storage tank showing another embodiment.

FIG. 4 is a circuit diagram showing another embodiment.

[Explanation of symbols]

 101 Refrigeration refrigerators 103a, 103b First refrigerant pipe 105 Refrigeration showcase 107 Prefabricated refrigerator 109 Liquid solenoid valve 111 Refrigeration refrigerators 113a, 113b Second refrigerant pipe 115 Refrigeration showcase 117 Prefabricated freezer 119 Liquid solenoid valve 121 first supercooling heat exchanger 123 second second supercooling heat exchanger 125a, 125b third refrigerant pipe (heat storage refrigerant pipe) 127 heat storage heat exchanger 129 expansion valve 131a-131g brine pipe 131h- 131i Brine piping 133,134 Ice heat storage tank 135 Brine pump 136a, 136b Open / close valve (ice making inhibition means) 137 Three-way valve A Refrigeration system B Refrigeration system C Ice heat storage unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomoyuki Shiomi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Akira Oiwa 2-chome Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Kazuhiko Mihara 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka 2-5 Sanyo Electric Co., Ltd. (72) Kensuke Oka 2 Keihan-Hondori, Moriguchi-shi, Osaka 5-5, Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. An ice heat storage system for performing an ice melting and cooling operation using ice stored in an ice heat storage tank by an ice making operation, wherein a plurality of ice heat storage tanks having different capacities capable of simultaneous ice making operation are provided. An ice heat storage system provided with ice making prohibition means for prohibiting ice making to the small-capacity ice heat storage tank when the amount of ice stored in the ice heat storage tank reaches a predetermined amount. 2. A low-temperature cooling system configured by connecting a refrigerator and a plurality of low-temperature showcases and the like in parallel by a refrigerant pipe; a supercooling heat exchanger connected to the refrigerant pipe; A heat exchanger for heat storage connected by a refrigerant pipe; and a plurality of ice heat storage tanks having different capacities connected to the heat exchanger for supercooling and the heat exchanger for heat storage by brine piping, and having a small capacity of ice. An ice heat storage system, comprising ice making prohibition means for prohibiting ice making in the small-capacity ice heat storage tank when the amount of ice stored in the heat storage tank reaches a predetermined amount. 3. A refrigeration system in which a plurality of refrigeration showcases and the like are connected in parallel to one refrigeration refrigerator by a first refrigerant pipe; and A refrigeration system configured by connecting a showcase or the like in parallel with a second refrigerant pipe, a first supercooling heat exchanger connected to the first refrigerant pipe, and a second refrigerant pipe. A second subcooling heat exchanger connected thereto; a heat storage heat exchanger connected to one of the refrigeration refrigerator or the freezing refrigerator via a third refrigerant pipe; and the first superheater. A cooling heat exchanger, a second subcooling heat exchanger, and a plurality of ice storage tanks of different capacities connected by brine piping to the heat storage heat exchanger. An ice making prohibition means is provided for prohibiting ice making in the small-capacity ice heat storage tank when a predetermined amount is reached. An ice heat storage system characterized by the following.