JP2001241704A - Ice storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the heat-exchanging efficiency of an ice storage system and to reduce the cost of the system. SOLUTION: This ice storage system is provided with a refrigerant circuit 3 for cold storage equipped with a condenser, a compressor, a cooling storage compartment for cold storage, and an evaporator installed to, for example, a refrigerated showcase 1; a refrigerant circuit 6 for refrigeration equipped with a condenser, a compressor, a cooling storage compartment for refrigeration, and an evaporator installed to, for example, a freezing showcase 4; a heat exchanger 9 for cold storage which is branched from the discharge-side refrigerant pipeline 11 between the condenser and evaporator of the refrigerant circuit 3 and positioned in an ice storage water tank 7. This system is also provided with a heat exchanger 10 for refrigeration which is branched from the discharge- side refrigerant pipeline 40 between the condenser and evaporator of the refrigerant circuit 6 and positioned in the water tank 7. The system makes ice in the water tank 7 by means of the heat exchanger 9 for cold storage.

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 having a cooling storage for freezing and refrigeration, for example, a freezing showcase and a refrigeration showcase, a freezer and a refrigerator, and having respective refrigerant circuits.

[0002]

2. Description of the Related Art Conventionally, as this kind of ice heat storage system, Japanese Patent Application Laid-Open No. H11-230659 (F25D16 / 00) discloses a plurality of refrigeration showcases and the like via a first refrigerant pipe to one refrigeration refrigerator. And a refrigeration system configured by connecting a plurality of refrigeration showcases and the like to one refrigeration refrigerator in parallel via a second refrigerant pipe, A first supercooling heat exchanger connected to the liquid pipe of one refrigerant pipe, a second supercooling heat exchanger connected to the liquid pipe of the second refrigerant pipe, and the refrigeration refrigeration Heat exchanger for heat storage connected to a gas pipe of a third refrigerant pipe connected to a refrigerator and / or the refrigerator for freezing, the first supercooling heat exchanger, the second subcooling A heat exchanger and an ice heat storage tank connected to the heat storage heat exchanger via brine piping. Ice storage system is disclosed, wherein the.

[0003]

However, such a conventional ice heat storage system requires high cost because it requires a brine pipe and a pump device for supplying the brine. Further, there is a problem that the heat exchange efficiency is poor.

[0004] The present invention has been made in view of the above-mentioned problems, and provides an ice heat storage system for the purpose of improving heat exchange efficiency and reducing costs.

[0005]

According to a first aspect of the present invention, there is provided a condenser, a compressor, and an evaporator provided in a cooling storage for refrigeration. A refrigerating refrigerant circuit comprising a refrigerating refrigerant circuit, a condenser, a compressor, and an evaporator provided in a refrigerating cooling storage, and refrigerant piping between the condenser and the evaporator of the refrigerating refrigerant circuit And a refrigeration heat exchanger arranged in the water tank, and a refrigeration heat exchanger branched from the refrigerant pipe between the condenser and the evaporator of the refrigeration refrigerant circuit and arranged in the water tank. An ice heat storage system, comprising: making ice in a water tank with the refrigeration heat exchanger.

As described above, two systems of the refrigeration refrigerant circuit and the refrigeration refrigerant circuit are provided, ice is made in the water tank by the refrigeration heat exchanger of the refrigeration refrigerant circuit, and the refrigeration heat exchange is performed using the latent heat of melting of the ice. Supercooling of the heat exchanger and the refrigerating heat exchanger. According to the second aspect of the present invention, when performing the supercooling operation of the refrigeration refrigerant circuit in the refrigeration heat exchanger, the refrigeration heat exchanger is charged with the liquid refrigerant a predetermined time before the start of the supercooling operation. An ice heat storage system according to claim 1 is provided.

As described above, since the liquid refrigerant is filled in the refrigeration heat exchanger a predetermined time before the supercooling operation, the supercooling operation can be started smoothly. According to a third aspect of the present invention, there is provided the ice heat storage system according to the first or second aspect, wherein the set subcooling temperature can be changed in the refrigeration circuit depending on the temperature before the start of the supercooling operation. .

As described above, the temperature before starting the supercooling operation, for example, the ambient temperature, the refrigerant temperature on the condenser discharge side is detected, and the set temperature of the supercooling operation is changed according to the detected temperature. In the invention of claim 4, in the refrigeration refrigerant circuit, a throttle device is provided between the refrigeration heat exchanger and the compressor,
An ice heat storage system according to any one of claims 1 to 3, wherein a refrigerant circuit is formed via the expansion device after the supercooling operation.

As described above, after the supercooling operation, the liquid refrigerant stored in the refrigeration heat exchanger or the refrigerant pipe between the refrigeration heat exchanger and the evaporator is vaporized by the expansion device and then compressed. Return to In the invention according to claim 5, the ice storage operation according to any one of claims 1 to 4, wherein after the ice making operation for making ice in the water tank by the refrigeration heat exchanger, when the ice making rate decreases, the ice making operation is performed again. Provide system.

As described above, the refrigerating refrigerant circuit always performs the supercooling operation. Even if ice is made by the refrigerating heat exchanger, the ice and the refrigerating heat exchanger exchange heat, and the ice melts. For,
When the ice making rate decreases, the ice making operation is performed again.

According to a sixth aspect of the present invention, there is provided an ice heat storage system according to any one of the first to fifth aspects, wherein a suction pressure adjusting device is provided between the refrigerating heat exchanger and the compressor.

As described above, the rise of the water temperature in the water tank causes
The temperature of the refrigerant sent to the compressor may increase. Therefore, in order to prevent the cooling capacity of the evaporator from being reduced as much as possible, the pressure is adjusted by the suction pressure adjusting device.

[0013]

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

FIG. 1 is a refrigerant circuit diagram showing the system configuration of the present invention, FIG. 2 is a refrigerant circuit diagram showing the flow of refrigerant during normal operation, FIG. 3 is a refrigerant circuit diagram showing the flow of refrigerant during preparation for supercooling, 4 is a refrigerant circuit diagram showing the flow of the refrigerant at the time of supercooling, FIG. 5 is a refrigerant circuit diagram showing the flow of the refrigerant at the time of collecting the liquid refrigerant, and FIG.
Is a refrigerant circuit diagram showing the flow of the refrigerant during the cold storage operation, FIG. 7 is a perspective view when the heat insulating panel is combined, FIG. 8 is a perspective view when the ice heat storage water tank is assembled, and FIG. 9 is provided with a heat exchanger for refrigeration and freezing. 10 is a perspective view of the ice heat storage water tank in a state where the heat storage water tank is provided with a heat insulating lid, and FIG. 11 is a plan view of the ice heat storage water tank showing the arrangement of a refrigeration and freezing heat exchanger. .

FIG. 1 shows a refrigerant circuit according to the present invention, in which a plurality of refrigerated cold storages installed in a store, for example, evaporators (not shown) provided in refrigerated showcases 1, 1, 1,.
Five compressors and a condenser that constitute a refrigerating circuit together with the evaporator are built in, and a refrigerating refrigerating circuit 2 installed outside the store forms a refrigerating refrigerant circuit 3.

On the other hand, a cooling storage for freezing installed in a store, for example, an evaporator (not shown) provided in a freezing showcase 4 and five compressors and a condenser constituting a refrigerating circuit together with the evaporator are built in. And a refrigeration refrigerator 5 installed outside the store to form a refrigeration refrigerant circuit 6.

Although not shown, the refrigerator 2 and the refrigerator 5 are provided with a blower for cooling the condenser. Furthermore, the refrigerator 2 and the refrigerator 5
, Five of which are provided, three of which are normally operating and two of which are stopped. However, the compressor is operated in a range of 1 to 5 units depending on the load of the condenser.

Outside the store, an ice heat storage water tank 7 is provided. In the ice heat storage water tank 7, brine, in this embodiment, water 8 is stored.
And a refrigeration heat exchanger 10 connected to the refrigeration circuit 6 are located underwater.

Hereinafter, the refrigeration circuit 3 will be described in detail with reference to the drawings.

An inlet-side supercooled refrigerant pipe 12 branched from a discharge-side refrigerant pipe 11 of a condenser of the refrigeration refrigerator 2 is connected to an inlet side of the refrigeration heat exchanger 9. The inlet side subcooling refrigerant pipe 12 has an inlet side subcooling solenoid valve 13 interposed therebetween. Further, on the outlet side of the refrigeration heat exchanger 9, a refrigeration outlet side supercooled refrigerant pipe 14 connected between the branch portion of the discharge refrigerant pipe 11 and the evaporator of the refrigeration showcase 1 is connected. Have been.
The outlet side subcooling refrigerant pipe 14 has an outlet side subcooling solenoid valve 15 and a check valve 16 interposed.

A flow solenoid valve 17 is provided between the connection position of the discharge side refrigerant pipe 11 to the inlet side supercooled refrigerant pipe 12 and the connection position to the outlet side supercooled refrigerant pipe 14. . Further, a flow rate control circuit 20 connected in parallel with the flow rate solenoid valve 17 and having different pipe diameters (for example, 1: 2: 4) and having a flow rate control solenoid valve 18 and a throttle device 19 is provided. . In the present embodiment, there are three types of the flow control circuits 20, and eight stages of control are performed from a state in which the refrigerant does not flow through the flow control circuits 20 to a state in which the refrigerant flows through all the flow control circuits 20. However, more flow control circuits 20 may be provided to perform finer flow control.

The electromagnetic valve 18 for controlling the flow rate is a temperature detecting device provided on the evaporator side of the refrigerated showcase 1 from the position where the discharge side refrigerant pipe 11 is connected to the outlet side supercooled refrigerant pipe 14, Controlled by the sensor 21.

The evaporator of the refrigerated showcase 1 and the compressor of the refrigeration refrigerator 2 are connected by a suction-side refrigerant pipe 22.

Further, the discharge side refrigerant pipe 11 and the inlet side of the refrigeration heat exchanger 9 are connected by an inlet side cold storage pipe 23, and the inlet side cold storage pipe 23 has an inlet side cold storage pipe 23. An electromagnetic valve 24 and an expansion valve 25 are provided.

Further, between the outlet side of the refrigeration heat exchanger 9 and the compressor of the refrigeration refrigerator 2, an outlet side cold storage pipe 2 is provided.
6 and the outlet side cold storage pipe 26
An outlet side cold storage electromagnetic valve 27 and a suction pressure adjusting device 28 are provided.

In parallel with the outlet side cold storage solenoid valve 27 and the suction pressure adjusting device 28, a liquid refrigerant recovery solenoid valve 29
And an aperture device 30 are provided. The expansion device may be any device that vaporizes the liquid refrigerant, such as a capillary tube.

An accumulator 32 for protecting the compressor is provided in front of the compressor of the refrigerating refrigerator 2 in the outlet side regenerative pipe 26, and the refrigerating refrigerator 2 of the discharge-side refrigerant pipe 11 is provided. A receiver tank 31 is provided behind the condenser.

Further, from the connection position of the discharge side refrigerant pipe 11 with the inlet side regenerative pipe 23, to the refrigeration refrigerator 2 side, a temperature detecting device for detecting the condenser discharge temperature of the refrigeration refrigerator 2; A temperature sensor 33 is provided.

Next, the refrigeration circuit 6 will be described in detail with reference to the drawings.

A discharge side refrigerant pipe 4 is provided between the condenser outlet side of the refrigerating refrigerator 5 and the evaporator of the refrigerating showcase 4.
The discharge side refrigerant pipe 40 has a pipe diameter different (for example, 1: 2: 4) and a flow control circuit 4 provided with a flow control electromagnetic valve 41 and a throttle device 42, respectively.
3 are provided. In the present embodiment, there are three types of the flow rate control circuits 43, but a larger number may be provided to perform finer flow rate control.

The electromagnetic valve 41 for controlling the flow rate is controlled by a temperature sensor, that is, a temperature sensor 44 provided on the suction side of the evaporator of the refrigeration showcase 4 of the refrigerant pipe 40 on the discharge side.

Further, the discharge side refrigerant pipe 40 branches in front of the flow rate control circuit 43 and is connected to the refrigeration heat exchanger 10.
Connected to the entrance side of And this refrigeration heat exchanger 1
The outlet side of 0 merges behind the flow control circuit 43,
It is connected to the evaporator of the freezer showcase 4.

The evaporator of the refrigeration showcase 4 and the compressor of the refrigeration refrigerator 5 are connected by a suction-side refrigerant pipe 45. Next, the ice heat storage tank 7 will be described with reference to FIGS. The ice heat storage tank 7 is formed by combining a plurality of heat insulating panels, and has an inner surface coated with FRP resin and subjected to a waterproof treatment.

More specifically, as shown in FIG. 7, two bottom heat insulating panels 46 and a plurality of side heat insulating panels 47 erected upward from the ends of the bottom heat insulating panels 46 are combined. As shown, after the periphery is reinforced with an iron frame 48, the inner side of each of the combined heat insulating panels 46 and 47 is provided with an F to prevent water from leaking from a connection portion between the heat insulating panels 46 and 47.
Apply RP solution.

Next, as shown in FIGS. 9 and 11, the refrigerating heat exchanger 9 is provided on the inner side.
Is disposed in the vicinity of the inner surface of the ice heat storage water tank 7 so as to surround. Finally, as shown in FIG. 10, the open upper surface is closed with a heat insulating lid 49.

With the above arrangement, the flow of the refrigerant during each operation will be described with reference to the drawings.

FIG. 2 shows the flow of refrigerant during normal operation. First, the refrigeration circuit 3 will be described. Refrigeration refrigerator 2
The high-temperature and high-pressure refrigerant discharged from the compressor is condensed in the condenser of the refrigerator 2 and passes through the discharge-side refrigerant pipe 11, depending on one of the flow control circuits 20 and the load state. Alternatively, the refrigerated showcase 1 is cooled by passing through the flow control circuit 20 which is a combination of three, and is evaporated by the evaporator of the refrigerated showcase 1. After being evaporated by the evaporator, the refrigerant returns to the compressor of the refrigerator 2 through the suction-side refrigerant pipe 22.

That is, during normal operation, the supercooling is not performed in the refrigeration refrigerant circuit 3.

Next, the refrigeration circuit 6 will be described.

The high-temperature and high-pressure refrigerant discharged from the compressor of the refrigerating refrigerator 5 is condensed by the condenser of the refrigerating refrigerator 5, passes through the discharge-side refrigerant pipe 40, and a part of the refrigerant is refrigerated. Flows into the heat exchanger 10, and the other refrigerant flows into the flow control circuit 43.
Flows into. Here, part of the water 8 in the ice heat storage water tank 7 has been iced by the cold storage operation on the previous day.

Then, the refrigerant passes through the freezing heat exchanger 10 and exchanges heat with water and ice in the ice heat storage water tank 7, and the supercooled refrigerant passes through the flow control circuit 43 and The refrigerant is mixed with the refrigerant having the flow rate and is evaporated by the evaporator of the freezing showcase 4. After cooling the refrigeration showcase 4 with this evaporator, the refrigerant returns to the compressor of the refrigeration refrigerator 5 through the suction side refrigerant pipe 45.

In this embodiment, the temperature sensor 44 detects the temperature of the mixed refrigerant of the refrigerant after supercooling and the refrigerant before supercooling, and when the temperature is higher than the set temperature, the amount of refrigerant to be supercooled is determined. Flow control circuit 4 with the lowest flow rate to increase
Control is performed so as to open the electromagnetic valve 41 for flow control of No. 3.

As described above, in the present embodiment, the refrigeration circuit 6 can perform three types of temperature control.

Next, FIG. 3 shows the flow of the refrigerant at the time of preparing for supercooling. First, the refrigeration refrigerant circuit 3 will be described.

The supercooling preparation operation is performed about 20 to 30 minutes before the start of the supercooling operation, and is performed in parallel with the normal operation. That is, the inlet side subcooling solenoid valve 13 is opened, the outlet side subcooling solenoid valve 15 is closed, and normal operation is continued. Therefore, after a part of the refrigerant flows into the refrigeration heat exchanger and is sufficiently charged, the supercooling operation is started. Here, the condensation temperature during the supercooling preparation operation, that is, the temperature sensor 2
At the detected temperature of 1, the set temperature of the supercooling operation is determined. For example, in summer, when the discharge temperature of the condenser is 45 ° C,
When the set temperature of supercooling is about 20 ° C. and 30 ° C. in winter, the temperature is set to 10 to 15 ° C. In this case, an outside air temperature sensor may be separately provided, and the set temperature of supercooling may be changed by the outside air temperature sensor.

At this time, the inlet side cold storage solenoid valve 24, the outlet side cold storage solenoid valve 27, and the liquid refrigerant recovery solenoid valve 29 are closed.

In this case as well, the refrigeration circuit 6 continues the cooling operation with the supercooling operation as in the normal operation.

FIG. 4 shows the flow of the refrigerant during the subcooling operation. This subcooling operation is performed after the above-described subcooling preparation operation has been performed for about 20 to 30 minutes. The subcooling operation is performed by opening the outlet side subcooling solenoid valve 15 and closing the flow rate solenoid valve 17 while keeping the inlet side subcooling solenoid valve 13 open. The refrigerant is mixed with the refrigerant whose flow rate is controlled by the flow control solenoid valve 18 through the refrigeration heat exchanger 9 and the outlet side supercooled refrigerant pipe 14, and flows into the evaporator of the refrigerated showcase 1. The flow control electromagnetic valve 18 is opened and closed based on the mixed refrigerant temperature, and the cooling capacity of the evaporator of the refrigerated showcase 1 is controlled.

As described above, by performing the supercooling control, a desired refrigerating capacity can be obtained even when the outside air temperature is high and the load is high, such as in midsummer.

Also in this case, the refrigeration circuit 6 continues the cooling operation with the supercooling operation as in the normal operation.

FIG. 5 shows the flow of the refrigerant in the liquid refrigerant recovery operation. In the liquid refrigerant recovery operation, the refrigerant stored in the refrigeration heat exchanger 9 and the outlet side cold storage pipe 26 is cooled by the inlet side cold storage. Closing electromagnetic valve 24 and outlet side cold storage electromagnetic valve 27,
By opening the liquid refrigerant recovery solenoid valve 29, the refrigeration heat exchanger 9,
Via the outlet side regenerator pipe 26, squeezed by the squeezing device 30,
After being vaporized, it is returned to the compressor of the refrigerator 2.

As described above, the vaporization by the expansion device 30 prevents the liquid refrigerant trapped in the refrigeration heat exchanger 9 from backing out to the compressor and protects the compressor.

By performing the above circulation for about 3 hours,
Liquid refrigerant can be prevented from stagnation into the inlet-side cold storage pipe 23, the refrigeration heat exchanger 9, the outlet-side cold storage pipe 26, and the like.

In the liquid refrigerant recovery operation, the inlet side supercooling solenoid valve 13 and the outlet side supercooling solenoid valve 15 are closed.
Cooling of the refrigerated showcase 1 is continued.

Further, the refrigeration circuit 6 is operated similarly to the normal operation.
Cooling operation with supercooling operation is continued.

For example, when the store is closed at 7:00 PM, the liquid refrigerant recovery operation is performed from 7:00 PM, and the cold storage operation is started when the time reaches 10:00 PM. Therefore, normally, when this liquid refrigerant recovery operation is started,
Since the night cover and the night set back are set, the load is less than during the business hours of the store.

If a power failure occurs during the liquid refrigerant recovery operation described above and the liquid refrigerant recovery operation cannot be performed, the cold storage operation is not performed to protect the compressor of the refrigeration refrigerator 2.

Therefore, the flow rate of the refrigerant for cooling the evaporator of the refrigerated showcase 1 is reduced, and a sufficient amount of the refrigerant for use in the cold storage operation can be secured.

As shown in FIG. 6, the flow of the refrigerant in the cold storage operation is performed by closing the liquid refrigerant recovery solenoid valve 29 and opening the outlet side cold storage solenoid valve 27, through the suction pressure adjusting device 28, as shown in FIG. Circulate. Furthermore, all five compressors of the refrigerator 2 are forcibly operated. Since the suction pressure adjusting device 28 is provided in this manner, for example, even if the water temperature of the ice heat storage water tank 7 rises and the temperature of the refrigerant flowing through the refrigeration heat exchanger 9 rises to a high pressure, the suction pressure adjusting device 28 Since the pressure can be returned to the compressor of the refrigeration refrigerator 2 as an appropriate pressure at 28, a decrease in the cooling capacity of the refrigeration showcase 1 can be prevented as much as possible.

As described above, ice is produced by freezing the water 8 in the ice heat storage tank 7 in the refrigeration heat exchanger 9.

The ice making rate of the ice heat storage water tank 7 is 100%.
In the case of, the cold storage operation is temporarily stopped. However, the ice in the ice heat storage water tank 7 is reduced because the refrigeration refrigerant circuit 6 continues the cooling operation with the supercooling operation as in the normal operation.
Therefore, when the ice making rate reaches 70%, the cold storage operation is re-established and continued until the ice making rate becomes 100% again.

The above cold storage operation is switched to the normal operation.
For example, it continues until 8:00 AM the next morning.

Although the present embodiment has been described using the refrigeration and freezing showcases, a refrigerator or the like may be used.

[0064]

As described above in detail, according to the first aspect of the present invention, there are provided two systems of a refrigeration refrigerant circuit and a refrigeration refrigerant circuit, and ice making in a water tank by a refrigeration heat exchanger of the refrigeration refrigerant circuit. Then, the cooling heat exchanger and the refrigerating heat exchanger are supercooled by the latent heat of melting of the ice.

Therefore, although a load is applied when the store is opened, ice is produced using a refrigeration refrigerant circuit which has a low load when the store is closed and is used as supercooling of a refrigeration heat exchanger which is always loaded, so that the heat exchange efficiency is reduced. It will be improved. Further, since there is no pump or brine piping for supplying the brine, the cost can be reduced. Claim 2
According to the invention, since the liquid refrigerant is filled in the refrigeration heat exchanger a predetermined time before the supercooling operation, the supercooling operation can be started smoothly. According to the third aspect of the present invention, the temperature before starting the supercooling operation, for example, the ambient temperature, the refrigerant temperature on the condenser discharge side is detected, and the set temperature of the supercooling operation is changed based on the detected temperature. Further, according to the invention of claim 4, after the subcooling operation, the liquid refrigerant laid down in the refrigeration heat exchanger or the refrigerant pipe between the refrigeration heat exchanger and the evaporator is vaporized by the expansion device. , Return to the compressor. Therefore, the compressor is protected. According to the fifth aspect of the present invention, the refrigeration refrigerant circuit always performs a supercooling operation, and even if ice is made in the refrigeration heat exchanger, the ice and the refrigeration heat exchanger exchange heat, and the ice is cooled. If the ice making ratio decreases because of melting, the ice making operation is performed again.

Further, according to the invention of claim 6, there is a possibility that the temperature of the refrigerant sent to the compressor may increase due to an increase in the temperature of the water in the water tank. Therefore, in order to prevent the cooling capacity of the evaporator from being reduced as much as possible, the pressure is adjusted by the suction pressure adjusting device.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram showing a system configuration of the present invention.

FIG. 2 is a refrigerant circuit diagram showing the flow of refrigerant during normal operation.

FIG. 3 is a refrigerant circuit diagram showing a flow of a refrigerant at the time of preparing for supercooling.

FIG. 4 is a refrigerant circuit diagram illustrating a flow of a refrigerant during supercooling.

FIG. 5 is a refrigerant circuit diagram showing a flow of a refrigerant at the time of recovering a liquid refrigerant.

FIG. 6 is a refrigerant circuit diagram illustrating a flow of a refrigerant during a cold storage operation.

FIG. 7 is a perspective view when a heat insulating panel is combined.

FIG. 8 is a perspective view when assembling the ice heat storage tank.

FIG. 9 is a perspective view of an ice heat storage water tank provided with a heat exchanger for refrigeration and freezing.

FIG. 10 is a perspective view showing a state in which a heat insulating lid is provided in the ice heat storage water tank.

FIG. 11 is a plan view of an ice heat storage water tank showing an arrangement of a heat exchanger for refrigeration and freezing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigeration showcase 3 Refrigeration refrigerant circuit 4 Refrigeration showcase 6 Refrigeration refrigerant circuit 7 Ice heat storage water tank 9 Refrigeration heat exchanger 10 Freezing heat exchanger 11 Discharge side refrigerant pipe 40 Discharge side refrigerant pipe

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) F25D 16/00 F25D 16/00 (72) Inventor Kazuhiro Sekiguchi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka No. Sanyo Electric Co., Ltd. (72) Inventor Toshio Miyazawa 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3L045 AA01 AA02 AA03 BA01 BA10 CA02 DA01 EA01 HA03 HA07 HA09 JA02 JA12 JA13 JA14 KA15 LA03 MA01 MA09 MA11 NA00 NA16 PA04 PA05

Claims (6)

[Claims] 1. A refrigerant circuit for refrigeration comprising a condenser, a compressor, and an evaporator provided in a refrigerated storage for refrigeration;
A refrigeration refrigerant circuit including a condenser, a compressor, and an evaporator provided in a refrigeration cooling storage; and a refrigerant pipe branched from a refrigerant pipe between the condenser and the evaporator of the refrigeration refrigerant circuit. A refrigeration heat exchanger disposed in the refrigeration circuit, and a refrigeration heat exchanger branched from a refrigerant pipe between the condenser and the evaporator of the refrigeration refrigerant circuit and disposed in the water tank. An ice storage system characterized by making ice in a water tank with an exchanger. 2. A supercooling operation of a refrigeration refrigerant circuit in a refrigeration heat exchanger is characterized in that the refrigeration heat exchanger is filled with a liquid refrigerant a predetermined time before the start of the supercooling operation. The ice heat storage system according to claim 1. 3. The ice heat storage system according to claim 1, wherein in the refrigeration circuit, the set subcooling temperature can be changed depending on the temperature before the start of the supercooling operation. 4. A refrigeration circuit, wherein a throttling device is provided between the refrigeration heat exchanger and the compressor, and after the supercooling operation, a refrigerant circuit is formed via the throttling device. The ice heat storage system according to claim 3. 5. The ice according to claim 1, wherein after the ice making operation for making ice in the water tank by the refrigeration heat exchanger, if the ice making ratio decreases, the ice making operation is performed again. Thermal storage system. 6. A suction pressure adjusting device is provided between a refrigerating heat exchanger and a compressor.
An ice thermal storage system according to any of the preceding claims.