JP2002303458A - Ice storage system for cooling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ice storage system for cooling equipment which levels electric energy without the necessity of providing a specific facility, such as a brine circuit. SOLUTION: The system is provided with a refrigerant circuit 6, a heat storage water tank 14 having a refrigeration side heat exchanger 15, a solenoid valve 21 for supercooling, and an electromagnetic valve 22 for ice making. The circuit 6 has a constitution in which a compressor 8, a condenser 9, an expansion valve 10, a cooler 11 for cooling a refrigeration show case 2, and the like, are annularly connected. The system is also provided with a channel control means which determines whether to allow the solenoid valve 22 to take an ice making process in which ice is made in the tank 14 by flowing the refrigerant that has passed through the compressor 9 and depressurized thereafter, to the heat exchanger 15, or to allow the solenoid valve 21 to take a supercooling process of the refrigerant by flowing the refrigerant that has passed through the compressor 9 to the heat exchanger 15 without depressurization and then to the expansion valve 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a compressor, a condenser,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage system for a cooling facility that performs ice heat storage and supercooling using a refrigerant circuit configured by connecting a depressurizing unit and a cooler for cooling the cooling facility in a ring shape.

[0002]

2. Description of the Related Art Conventionally, this type of ice heat storage system for cooling equipment includes a brine circuit for storing ice heat in a heat storage water tank by circulating brine, a refrigerant circuit for cooling the cooling equipment by a refrigerator, and a brine circuit. A heat exchanger for exchanging heat between the circuit and the refrigerant circuit, cooling the brine by the surplus capacity of the refrigerator,
A supercooling operation is performed by the cooled brine during a time period when a load is applied to the cooling facility to improve the cooling efficiency of the cooling facility. Thereby, usually, ice making of the heat storage water tank is performed at night or the like when the power consumption is small, and the condenser is used by using the ice heat storage of the heat storage water tank at the day time when the power consumption is large and a load is applied to a device such as a compressor. Since the passed refrigerant is supercooled, the power consumption per day can be leveled, and the load on equipment such as a compressor can be reduced.

[0003]

However, in such a conventional ice heat storage system, since a brine circuit for performing ice heat storage had to be specially provided, there was a problem that the capital investment rose and the mounting work became complicated. Further, in the conventional ice heat storage system, since ice heat is stored in a single heat storage water tank, a heat storage water tank having a capacity corresponding to the capacity of the refrigerator used in the ice heat storage system must be used. It was difficult from the viewpoint of cost to manufacture a heat storage water tank according to the capacity of the heat storage water tank.

Accordingly, the present invention has been made to solve the conventional technical problem, and has a cooling facility capable of leveling the amount of power without providing a special facility such as a brine circuit. It is an object of the present invention to provide an ice thermal storage system.

[0005]

The ice heat storage system for cooling equipment according to the present invention is constituted by connecting a compressor, a condenser, a pressure reducing means, a cooler for cooling the cooling equipment, and the like in a ring shape. A refrigerant circuit, a heat storage water tank equipped with a heat exchanger, and an ice making process for making ice in the heat storage water tank by depressurizing the refrigerant passing through the condenser and flowing the heat into the heat exchanger, or depressurizing the refrigerant passing through the condenser. A flow control means is provided for controlling whether or not to perform a subcooling step of the refrigerant by flowing the heat to the heat exchanger and then to the pressure reducing means.

According to the present invention, a refrigerant circuit constituted by connecting a compressor, a condenser, a decompression means, a cooler for cooling a cooling facility, and the like in a ring shape, and a heat storage provided with a heat exchanger Water tank and, by reducing the pressure of the refrigerant that has passed through the condenser and flowing it to the heat exchanger, perform an ice making process in the heat storage water tank to make ice, or after flowing the refrigerant that has passed through the condenser to the heat exchanger without reducing the pressure, By flowing to the depressurizing means, it is provided with a flow path control means for controlling whether to perform a subcooling step of the refrigerant, so when not cooling the cooling equipment, the refrigerant passing through the condenser is depressurized and passed to the heat exchanger. Sink, perform an ice making process to make ice in the heat storage water tank, when cooling the cooling equipment, flow the refrigerant through the condenser to the heat exchanger without decompression, in the heat storage water tank ice-made in the ice making process A subcooling process for supercooling the refrigerant using ice storage So that it is.

[0007] In this way, usually, the ice making process of the heat storage water tank is performed at night or the like when the electric power consumption is small, and the ice heat storage of the heat storage water tank is used at the day time when the electric power consumption is large and the load such as the compressor is applied. A supercooling process that supercools the refrigerant that has passed through the condenser, making it possible to equalize the amount of power used per day and reduce the load on equipment such as compressors. Will be able to

According to a second aspect of the present invention, there is provided an ice heat storage system for a cooling facility, comprising: a refrigerant circuit configured by connecting a compressor, a condenser, a pressure reducing means, a cooler for cooling the cooling facility, and the like in a ring shape. A plurality of heat storage water tanks each having a heat exchanger, and an ice making process for making ice in the heat storage water tank by reducing the pressure of the refrigerant passing through the condenser and flowing the heat to the heat exchanger, or depressurizing the refrigerant passing through the condenser. After flowing to the heat exchanger without flowing, by flowing to the pressure reducing means, it is provided with a plurality of flow path control means for independently controlling whether to perform the supercooling step of the refrigerant for each heat storage water tank And

According to the second aspect of the present invention, there is provided a refrigerant circuit constituted by connecting a compressor, a condenser, a pressure reducing means, a cooler for cooling a cooling facility, and the like in an annular manner.
A plurality of heat storage water tanks each equipped with a heat exchanger, and the refrigerant passing through the condenser is depressurized and flown to the heat exchanger, thereby performing an ice making process of making ice in the heat storage water tank, or depressurizing the refrigerant passing through the condenser. After flowing through the heat exchanger without flowing, by flowing through the depressurizing means, it is provided with a plurality of flow path control means for independently controlling whether to perform the supercooling step of the refrigerant for each heat storage water tank,
If the cooling equipment is not cooled, the refrigerant that has passed through the condenser is depressurized and flown to the heat exchanger, and an ice making process is performed to make ice in the heat storage water tank.If the cooling equipment is cooled, the refrigerant that has passed through the condenser is cooled. It is possible to perform a supercooling step in which the refrigerant flows into the heat exchanger without being depressurized and the refrigerant is supercooled using the ice heat stored in the heat storage water tank made in the ice making step.

[0010] In this way, usually, the ice making process of the heat storage water tank is performed at night or the like when the electric power consumption is small, and the ice heat storage of the heat storage water tank is used at the day time when the electric power consumption is large and the load such as the compressor is applied. A supercooling process that supercools the refrigerant that has passed through the condenser, making it possible to equalize the amount of power used per day and reduce the load on equipment such as compressors. Will be able to

[0011] Further, after the refrigerant that has passed through the condenser flows through the heat exchanger without being depressurized, the refrigerant flows through the depressurizing means to independently control whether or not to perform the supercooling step for each heat storage water tank. Since the flow path control means is provided, a single or a plurality of heat storage water tanks for performing the supercooling step of the refrigerant can be provided, and the convenience is improved.

According to a third aspect of the present invention, in addition to the second aspect of the present invention, when the ice making step is performed, the flow path control means performs ice making in all the heat storage water tanks and performs a supercooling step. In this case, the refrigerant is supercooled in one or a plurality of heat storage water tanks according to the cooling load.

According to the third aspect of the present invention, in addition to the second aspect, the flow path control means performs ice making in all of the heat storage water tanks when performing the ice making step and performs the super cooling step when performing the super cooling step. Performs supercooling of the refrigerant in one or more heat storage water tanks according to the cooling load, so that the supercooling process can be performed only with the required number of heat storage water tanks according to the load of the cooling equipment, The amount can be reduced.

According to a fourth aspect of the present invention, in addition to the first, second or third aspect of the present invention, the refrigerant circuit is a refrigeration refrigerant circuit, and the heat storage water tank is It is characterized by comprising a refrigerant supercooling heat exchanger of a refrigerant circuit for refrigeration different from the refrigerant circuit.

According to the invention of claim 4, in addition to the invention of claim 1, 2, or 3, the refrigerant circuit is a refrigerant circuit for refrigeration, and the heat storage water tank is different from the refrigerant circuit. Since it has a heat exchanger for subcooling the refrigerant of the refrigerant circuit for refrigeration,
Equipment such as a compressor that constitutes a refrigeration refrigerant circuit by exchanging heat with the ice subcooling heat exchanger of the refrigeration refrigerant circuit by making ice heat in the heat storage water tank in the refrigeration refrigerant circuit. Can be reduced, and the total power consumption can be leveled.

According to a fifth aspect of the present invention, in addition to the first, second, third, or fourth aspect of the present invention, the heat storage water tank and the flow path control means are integrated as a unit. It is characterized by having been done.

According to the fifth aspect of the present invention, in addition to the first, second, third or fourth aspects of the present invention, the heat storage water tank and the flow path control means are integrated as a unit. The efficiency of the installation work can be improved, and the complicated piping connection can be simplified.

According to a sixth aspect of the present invention, in addition to the fifth aspect of the present invention, there is provided an ice heat storage system for a cooling facility for forming a refrigerant flow path bypassing a refrigerant supercooling heat exchanger in a refrigeration circuit. A bypass unit is provided, and the bypass unit is integrated with the heat storage tank and the flow path control unit as a unit.

According to a sixth aspect of the present invention, in addition to the fifth aspect of the present invention, there is provided a bypass means for forming a refrigerant flow path bypassing the refrigerant supercooling heat exchanger of the refrigeration circuit, Since the bypass means is integrated as a unit with the heat storage water tank and the flow path control means, the efficiency of the installation work can be further improved, and the complicated piping connection can be simplified. Will be able to

According to a seventh aspect of the present invention, in addition to the first, second, third, fourth, fifth or sixth aspects of the present invention, the ice heat storage system for cooling equipment is provided with a heat storage water tank. A refrigerant flow control means for controlling the flow rate of the refrigerant is provided, and the refrigerant flow control means is configured by unitizing a plurality of valve devices.

According to the seventh aspect of the invention, in addition to the first, second, third, fourth, fifth or sixth aspects of the invention, the flow rate of the refrigerant to the heat storage water tank is controlled. For controlling the flow rate of the refrigerant, the refrigerant flow control means is configured by unitizing a plurality of valve devices, so that the efficiency of installation work can be improved and the connection of the valve devices can be improved. It can be simplified.

[0022]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a refrigerant circuit diagram of the cooling system 1 of the present invention. The cooling system 1 is used in a store such as a supermarket, and has a system configured to cool a refrigerated showcase 2 and a frozen showcase 3 as cooling equipment, and 6 is a first system for freezing the refrigerated showcase 2. The refrigerant circuit 7 is a second refrigerant circuit for cooling the frozen showcase 3.

In the first refrigerant circuit 6, a compressor 8, a condenser 9, an electromagnetic valve 18, an expansion valve 10 as a pressure reducing means, and a cooler 11 provided in the refrigerated showcase 2 are connected by refrigerant pipes. It is configured by being sequentially connected in a ring. An electromagnetic valve 19 is provided in a refrigerant pipe between the condenser 9 and the expansion valve 10 of the first refrigerant circuit 6. And
A three-way pipe 13 is provided between the solenoid valve 19 and the condenser 9, and a branch pipe 12 connected to a refrigeration-side heat exchanger 15 provided in heat exchange with the heat storage water tank 14 is connected.
The refrigerant pipe between the cooler 11 and the compressor 8 of the first refrigerant circuit 6 is provided with a three-way pipe 16 through an ice making electromagnetic valve 20.
The branch pipe 17 connected to the other end of the refrigeration-side heat exchanger 15 is connected to the three-way pipe 16.

Here, the branch pipe 12 is branched into two at the inlet side of the refrigeration-side heat exchanger 15, and one of the branch pipes 12 is connected to a refrigeration-side heat valve 21 through a supercooling electromagnetic valve 21 as a flow path control means. The other end is connected to the inlet side of the exchanger 15, and the other end is connected to the inlet side of the refrigeration-side heat exchanger 15 via an ice making electromagnetic valve 22 as a flow path control means and an expansion valve 23 as a pressure reducing device.

The branch pipe 17 is connected to a branch pipe 25 via a three-way valve 24 at the outlet side of the refrigeration side heat exchanger 15, and the branch pipe 25 is provided with a refrigerant recovery electromagnetic valve 26. Have been. The other end of the branch pipe 25 is connected via a three-way pipe 27 to a refrigerant pipe between the cooler 11 of the first refrigerant circuit 6 and the three-way pipe 16.

The branch pipe 17 located between the outlet side of the refrigerator side heat exchanger 15 and the ice making solenoid valve 20 has a three-way pipe 28.
The refrigerant pipe 29 is connected through the
9, a supercooling solenoid valve 30 and a check valve 31 are sequentially connected, and then connected to a refrigerant pipe between the solenoid valve 19 and the solenoid valve 18 of the first refrigerant circuit 6 via a three-way pipe 32. Is done.
The check valve 31 is connected to the three-way pipe 32 from the supercooling electromagnetic valve 30.
Is allowed only in the direction of.

The three-way pipe 13, the solenoid valve 19, the three-way pipe 16, the ice making solenoid valve 20, the three-way pipe 27, and the three-way pipe 2
8, the refrigerant pipe 29, the supercooling solenoid valve 30, the check valve 31, and the three-way pipe 32 are integrally formed as a control pipe unit 33.

On the other hand, the second refrigerant circuit 7 includes a compressor 38,
38, a condenser 39, a refrigerant supercooling heat exchanger 40 provided in a heat exchange manner with the heat storage water tank 14, an electromagnetic valve 41,
The expansion valve 42 and the cooler 43 provided in the freezer showcase 3 are sequentially connected in a ring shape by a refrigerant pipe. On the inlet side and the outlet side of the refrigerant subcooling heat exchanger 40, a refrigerant channel 44 is provided as bypass means that bypasses the refrigerant subcooling heat exchanger 40. Is provided with a bypass solenoid valve 45.

The supercooling solenoid valve 21, the ice making solenoid valve 22, the expansion valve 23, the refrigeration side heat exchanger 15, the three-way pipe 24, and the refrigerant recovery solenoid valve 21 on the first refrigerant circuit 6 side. Solenoid valve 26 and subcooling heat exchanger 40 on second refrigerant circuit 7 side
The coolant flow path 44, the bypass solenoid valve 45, and the heat storage water tank 14 are integrally formed as a heat storage water tank unit 46.

Thus, by connecting one or more heat storage tank units 46 according to the capacity of the refrigerator used in the cooling system 1 of the present invention, the heat storage water tank 14 according to the capacity of the refrigerator can be easily arranged. Can be set up. Therefore, as compared with the conventional case where ice heat is stored using a single heat storage water tank, a heat storage water tank according to the capacity of the refrigerator can be used. In addition, there is no need to produce heat storage water tanks corresponding to the capacity of the refrigerator in accordance with the type of the refrigerator, thereby making it possible to reduce costs.

The compressors 8 and 38 and all the solenoid valves, that is, the solenoid valve 18, the solenoid valve 19 and the ice making solenoid valve 2
0, a supercooling solenoid valve 21, an ice making solenoid valve 22, a refrigerant recovery solenoid valve 26, a supercooling solenoid valve 30, a solenoid valve 41,
It is assumed that the bypass solenoid valve 45 is connected to a control device (not shown).

The operation of the cooling system 1 having the above configuration will be described with reference to FIGS. First, the ice making mode of the cooling system 1 with reference to FIG.
That is, the first refrigerant circuit 6 for cooling the refrigerated showcase 2
Performs the normal cooling operation and the heat storage operation of the heat storage water tank 14, and the second refrigerant circuit 7 that cools the freezing showcase 3 uses the ice heat stored in the heat storage water tank 14 in advance to supercool the refrigerant. The case of driving will be described.

In the ice making mode, the first control is performed by the control device.
Valve 18 constituting the refrigerant circuit 6 and the ice making electromagnetic valve 2
2, the ice making electromagnetic valve 20 is opened, and the supercooling electromagnetic valve 21, the refrigerant recovery electromagnetic valve 26, and the supercooling electromagnetic valve 30 are closed.

When the compressor 8 is operated, the solenoid valve 19 is opened, so that the high-temperature and high-pressure refrigerant discharged from the compressor 8 flows into the condenser 9 and then flows through the three-way pipe 13. Part of the refrigerant flows into the expansion valve 10 via the solenoid valve 19, the three-way pipe 32, and the solenoid valve 18 via the solenoid valve 19. This allows
After the pressure of the refrigerant is reduced by the expansion valve 10, the refrigerant exerts a cooling action in the cooler 11 installed in the refrigerated showcase 2, thereby cooling the inside of the refrigerated showcase 2. Then, the refrigerant flowing out of the cooler 11 returns to the compressor 8.

On the other hand, the remaining refrigerant that has flowed into the branch pipe 12 through the three-way pipe 13 has the ice making solenoid valve 22 opened and the supercooling solenoid valve 21 closed, so that the ice making solenoid valve is closed. The pressure is reduced by the expansion valve 23 through 22. Then, the depressurized refrigerant performs a cooling operation in the refrigeration-side heat exchanger 15 to perform an ice making process of cooling water and the like in the heat storage water tank 14. Since the refrigerant recovery solenoid valve 26 is closed by the controller, the refrigeration-side heat exchanger 1
The refrigerant flowing out of 5 flows into the branch pipe 17 and returns to the compressor 8 via the three-way pipe 28 and the ice making solenoid valve 20.
At this time, since the supercooling solenoid valve 30 is closed by the control device, the refrigerant flowing through the branch pipe 17 does not flow into the three-way pipe 32.

On the other hand, the second refrigerant circuit 7 includes a compressor 38,
The high-temperature, high-pressure refrigerant discharged from the compressors 38, 38 flows into the condenser 39, and then flows into the supercooling heat exchanger 40, and is refrigerated by the first refrigerant circuit 6. A supercooling step of supercooling the refrigerant in the second refrigerant circuit 7 using the ice heat stored in the heat storage water tank 14 by the side heat exchanger 15 is performed. At this time, by the control device,
When the refrigerant needs to be supercooled by the supercooling heat exchanger 40, the bypass solenoid valve 45 is closed. Further, when the refrigerant is not supercooled by the supercooling heat exchanger 40, that is, when the outside air temperature is low, or when the refrigerant cannot be supercooled by the supercooling heat exchanger 40, that is, when the heat storage water tank 14 If the ice heat storage is not necessary, the control device opens the bypass solenoid valve 45 to bypass the supercooling heat exchanger 40.

The refrigerant that has passed through the supercooling heat exchanger 40 or the bypass solenoid valve 45 passes through the solenoid valve 41 and is decompressed by the expansion valve 42, and then is placed in the refrigerator installed in the freezer showcase 3. By exerting the cooling action at 43,
The inside of the refrigerator showcase 3 is cooled. Then, the refrigerant flowing out of the cooler 43 returns to the compressor 38.

With the above configuration, in the ice making mode, ice heat can be stored in the heat storage water tank 14 without affecting the cooling capacity of the refrigerated showcase 2. Since the refrigerant of the second refrigerant circuit 7 can be supercooled, the second refrigerant circuit 7
Can be reduced in load on devices such as the compressor 38 that constitutes the above.

Next, referring to FIG. 3, the normal mode of the cooling system 1, that is, the first refrigerant circuit 6 for cooling the refrigerated showcase 2 performs a normal cooling operation and cools the frozen showcase 3. The case where the second refrigerant circuit 7 performs the supercooling operation of the refrigerant using the ice heat stored in the heat storage water tank 14 in advance will be described.

In the normal mode, the first control is performed by the control device.
The electromagnetic valve 19 and the electromagnetic valve 18 that constitute the refrigerant circuit 6 are opened, and the ice making electromagnetic valve 20, the supercooling electromagnetic valve 21, the ice making electromagnetic valve 22, and the refrigerant recovery electromagnetic valve 26
It is assumed that the supercooling electromagnetic valve 30 is closed.

When the compressor 8 is operated, the solenoid valve 19 is opened, and the supercooling solenoid valve 21 and the ice making solenoid valve 22 are closed.
After flowing into the condenser 9, the high-temperature and high-pressure refrigerant discharged from 8 flows into the expansion valve 10 via the three-way pipe 13, the solenoid valve 19, the three-way pipe 32 and the solenoid valve 18. As a result, the refrigerant is depressurized by the expansion valve 10,
The inside of the refrigerator showcase 2 is cooled by exerting a cooling effect by the cooler 11 installed in the refrigerator. And
Since the ice making electromagnetic valve 20 is closed by the control device, the refrigerant flowing out of the cooler 11 returns to the compressor 8. On the other hand, the second refrigerant circuit 7 supercools the refrigerant.

With the above-described configuration, in the normal mode, the second embodiment of the freezer showcase 3 uses the ice heat stored in the heat storage water tank 14 without affecting the cooling capacity of the refrigerated showcase 2. Since the refrigerant in the refrigerant circuit 7 can be supercooled, the load on devices such as the compressor 38 that constitute the second refrigerant circuit 7 can be reduced. In addition, it is possible to equalize the total power consumption.

Next, referring to FIG. 4, a supercooling mode of the cooling system 1, that is, a first mode for cooling the refrigerated showcase 2 will be described.
The refrigerant circuit 6 performs a supercooling operation using the ice heat stored in the heat storage water tank 14 in advance, and the second refrigerant circuit 7 that cools the freezing showcase 3 also stores heat in the heat storage water tank 14 in advance. A case of performing the supercooling operation of the refrigerant using the ice heat storage will be described.

In the supercooling mode, the solenoid valve 18, the supercooling solenoid valve 21, and the supercooling solenoid valve 30 constituting the first refrigerant circuit 6 are opened by the control device, and the solenoid valve 19 is opened. , Ice making solenoid valve 20 and ice making solenoid valve 22
It is assumed that the solenoid valve 26 for refrigerant recovery is closed.

Thus, when the compressor 8 is operated, the electromagnetic valve 19 is closed and the ice making electromagnetic valve 22 is closed, so that the high-temperature and high-pressure refrigerant discharged from the compressor 8 is condensed. After flowing into the heat exchanger 9, it passes through the three-way pipe 13, the branch pipe 12, and the supercooling solenoid valve 21, and the refrigeration side heat exchanger 1
5 and supercools the refrigerant in the first refrigerant circuit 6 using the ice heat stored in the heat storage water tank 14 in advance. Since the ice making electromagnetic valve 20 is closed, the refrigerant flowing out of the refrigeration-side heat exchanger 15 is supplied to the branch pipe 17 and the three-way pipe 28.
, Supercooling solenoid valve 30, check valve 31, three-way pipe 32
Then, after the pressure is reduced by the expansion valve 10 through the electromagnetic valve 18 in sequence, the cooler 11 installed in the refrigerated showcase 2 exerts a cooling action to cool the inside of the refrigerated showcase 2. Then, since the ice making electromagnetic valve 20 is closed by the control device, the refrigerant flowing out of the cooler 11 returns to the compressor 8. The second refrigerant circuit 7 supercools the refrigerant.

With the above configuration, in the supercooling mode, the first refrigerant circuit 6 of the refrigerated showcase 2 and the second refrigerant of the refrigerated showcase 3 are used by utilizing ice heat stored in the heat storage water tank 14 in advance. Since the refrigerant in the circuit 7 can be supercooled, the load on the compressor 3 or the device such as 38 can be reduced particularly in the daytime when the load is easily applied to the refrigerated showcase 2 and the frozen showcase 3. become able to. Further, for example, the heat storage water tank 14 may be used at night.
Since the refrigerant is supercooled in the daytime by utilizing the ice heat storage by this, the amount of electricity used in one day can be equalized.

Next, referring to FIG. 5, the second refrigerant circuit 7 for cooling the refrigeration showcase 3 while recovering the liquid refrigerant of the refrigeration-side heat exchanger 15 while the liquid recovery mode of the cooling system 1 is being performed. In the following, a case will be described in which a supercooling operation of the refrigerant is performed using ice heat stored in the heat storage water tank 14 in advance.

In the liquid recovery mode, the control device controls the solenoid valve 19 constituting the first refrigerant circuit 6 and the solenoid valve 18
The electromagnetic valve for ice recovery 20, the electromagnetic valve for ice making 20, the electromagnetic valve for supercooling 21, and the electromagnetic valve for ice making 2 are opened.
2, and the supercooling solenoid valve 30 is assumed to be closed.

Thus, when the compressors 8 are operated, the solenoid valve 19 is opened and the supercooling solenoid valve 2 is opened.
1 and the ice making electromagnetic valve 22 are closed, the high-temperature and high-pressure refrigerant discharged from the compressors 8 and 8 flows into the condenser 9, and then flows into the three-way pipe 13, the solenoid valve 19 and the three-way pipe 32. Through the solenoid valve 18 to the expansion valve 10. Thus, the refrigerant is depressurized by the expansion valve 10 and then exerts a cooling function in the cooler 11 installed in the refrigerated showcase 2, thereby cooling the inside of the refrigerated showcase 2.
Then, since the ice making electromagnetic valve 20 is closed by the control device, the refrigerant flowing out of the cooler 11 returns to the compressor 8.

At this time, since the refrigerant recovery electromagnetic valve 26 is opened by the control device and the compressor 8 is operated, the refrigerant stored in the refrigeration-side heat exchanger 15 is connected to the refrigerant recovery electromagnetic valve 26. Is collected by the compressor 8 via the branch pipe 25 and the three-way pipe 27. At this time, the second
Refrigerant circuit 7 performs supercooling of the refrigerant.

With the above configuration, the first refrigerant circuit 6 of the refrigerated showcase 2 is operated while recovering the refrigerant stored in the refrigeration-side heat exchanger 15, so that the refrigerant is cooled with a relatively small amount of refrigerant. The operation and the ice making operation can be performed.

Referring to FIG. 6, a plurality of heat storage tank units 46, three in the present invention, are connected, and a cooling showcase 2 and two freezing showcases 3A and 3B are installed. The system 50 will be described. The cooling system 50 is used in a store such as a supermarket similarly to the cooling system 1, and includes a refrigerated showcase 2 and a frozen showcase 3 as cooling facilities.
A system for cooling A and 3B is configured, 6A is a first refrigerant circuit for freezing the refrigerated showcase 2, 7A is a second refrigerant circuit for cooling the frozen showcase 3A, and 7B is for cooling the frozen showcase 3B. It is a third refrigerant circuit.

In the first refrigerant circuit 6A, a compressor 8, a condenser 9, an electromagnetic valve 18, an expansion valve 10 as a pressure reducing means, and a cooler 11 provided in the refrigerated showcase 2 are connected by refrigerant pipes. It is configured by being sequentially connected in a ring. An electromagnetic valve 19 is provided in a refrigerant pipe between the condenser 9 and the expansion valve 10 of the first refrigerant circuit 6.
Between the condenser 9 and the condenser 9, a three-way pipe 13 is provided, and refrigeration-side heat exchangers 15A, 15B, and 15C provided with heat storage water tanks 14A, 14B, and 14C, respectively, are provided with branch pipes 12A, 12B, They are connected in parallel via 12C.

A four-way pipe 51 is provided in the refrigerant pipe between the cooler 11 and the compressor 8 of the first refrigerant circuit 6,
The four-way pipe 51 is connected via an ice-making electromagnetic valve 52 to a three-way pipe 56, a branch pipe 17A to which the three-way pipe 57 and the check valve 58A are sequentially connected, and to the other side, refrigerant recovery. Solenoid valve 53 is connected.

Here, the branch pipe 12A branches into two at the inlet side of the refrigeration-side heat exchanger 15A, one of which branches through the supercooling solenoid valve 21A.
The other end is connected to the inlet side of the refrigeration-side heat exchanger 15A via the ice making electromagnetic valve 22A and the expansion valve 23A as a pressure reducing device. Further, the branch pipe 17A is provided at an outlet side of the refrigeration side heat exchanger 15A,
A branch pipe 25A is connected via a three-way valve 24A, and the branch pipe 25A is provided with a refrigerant recovery electromagnetic valve 26A. The other end of the branch pipe 25A is connected to a refrigerant pipe between the cooler 11 of the first refrigerant circuit 6A and the three-way pipe 51 via three-way pipes 54 and 55.

The branch pipe 12B connected in parallel with the branch pipe 12A is similarly connected to the refrigeration side heat exchanger 15B.
Is branched into two at the inlet side, one is connected to the inlet side of the refrigeration-side heat exchanger 15B via the supercooling electromagnetic valve 21B, and the other is the expansion valve as the ice making electromagnetic valve 22B and the pressure reducing device. It is connected to the inlet side of the refrigerator side heat exchanger 15B via the valve 23B. Further, a branch pipe 17B is connected to an outlet side of the refrigeration-side heat exchanger 15B via a check valve 58B. The other end of the branch pipe 17B is connected to the three-way pipe 57 via a three-way pipe 59.

Further, a branch pipe 25B is connected to the outlet side of the refrigeration side heat exchanger 15B via a three-way valve 24B.
The branch pipe 25B is provided with a refrigerant recovery solenoid valve 26B. The other end of the branch pipe 25B is connected to the three-way pipe 54 via a three-way pipe 60.

Similarly, the branch pipe 12C connected in parallel with the branch pipe 12A has a refrigeration side heat exchanger 15C.
Is branched into two at the inlet side, one is connected to the inlet side of the refrigeration-side heat exchanger 15C via the supercooling solenoid valve 21C, and the other is the ice making solenoid valve 22C and expansion as a pressure reducing device. It is connected to the inlet side of the refrigerator side heat exchanger 15C via the valve 23C. A branch pipe 17C is connected to an outlet side of the refrigeration-side heat exchanger 15C via a check valve 58C. The other end of the branch pipe 17C is connected to the three-way pipe 59C.
Connected to.

Further, a branch pipe 25C is connected to an outlet side of the refrigeration side heat exchanger 15C via a three-way valve 24C.
The branch pipe 25C is provided with a refrigerant recovery solenoid valve 26C. The other end of the branch pipe 25C is connected to the three-way pipe 60.

One end of a refrigerant pipe 61 is connected to the three-way pipe 56. The refrigerant circuit 6 is located between the solenoid valve 19 and the solenoid valve 18 via a check valve 62 and a supercooling solenoid valve 63.
A is connected. Further, the refrigerant collection solenoid valve 53 is
The refrigerant pipe 61 is connected between the three-way pipe 56 and the check valve 62 via the three-way valve 64. The check valve 62 is
It is assumed that the flow of the refrigerant is allowed only in the direction from the three-way pipe 64 to the supercooling solenoid valve 63.

The three-way pipe 13, the solenoid valve 19, the supercooling solenoid valve 63, the three-way pipe 51, the ice making solenoid valve 52,
The three-way pipe 56, the three-way pipe 64, the refrigerant pipe 61, the solenoid valve 53 for collecting refrigerant, and the check valve 62 are integrally formed as a control pipe unit 65.

On the other hand, the second refrigerant circuit 7A
A, a condenser 71A, a solenoid valve 72A, and an expansion valve 73A.
And a cooler 74A provided in the frozen showcase 3A
Are sequentially connected in a ring shape by a refrigerant pipe. Further, between the condenser 71 and the solenoid valve 72,
A refrigerant supercooling heat exchanger 40A provided in exchange with the heat storage water tank 14A and a refrigerant subcooling heat exchanger 40B provided in heat exchange with the heat storage water tank 14B are connected in parallel.

The refrigerant subcooling heat exchangers 40A and 40A
0B is provided with refrigerant flow paths 44A and 44B as bypass means for bypassing the refrigerant subcooling heat exchanger 40A or 40B on the inlet side and the outlet side, respectively. The refrigerant flow paths 44A and 44B Solenoid valves 45A and 45B are provided.

The third refrigerant circuit 7B is provided with a compressor 70
B, a condenser 71B, a refrigerant supercooling heat exchanger 40C which is provided in an alternating manner with the heat storage water tank 14C, and a solenoid valve 72.
B and a cooler 74B provided in the expansion valve 73B and the freezer showcase 3 are sequentially connected in a ring shape by a refrigerant pipe. In addition, a refrigerant flow path 44 as bypass means that bypasses the refrigerant subcooling heat exchanger 40C is provided on the inlet side and the outlet side of the refrigerant subcooling heat exchanger 40C.
C is provided, and a bypass solenoid valve 45C is provided in the refrigerant flow path 44C.

Here, the supercooling solenoid valve 21A on the first refrigerant circuit 6A side, the ice making solenoid valve 22A, and the expansion valve 2A
3A, the refrigeration side heat exchanger 15A, the three-way pipe 24A, the refrigerant recovery solenoid valve 26A, the check valve 58A, the supercooling heat exchanger 40A on the second refrigerant circuit 7A side, and the refrigerant flow path. 44
A, the bypass solenoid valve 45A, and the heat storage water tank 14A are integrally formed as a heat storage water tank unit 75A.

Similarly, the supercooling solenoid valve 21B, the ice making solenoid valve 22B, and the expansion valve 23B on the first refrigerant circuit 6A side.
Refrigeration-side heat exchanger 15B, three-way pipe 24B, refrigerant recovery solenoid valve 26B, check valve 58B, subcooling heat exchanger 40B on the second refrigerant circuit 7A side, and refrigerant flow path 44B.
And the bypass solenoid valve 45B and the heat storage water tank 14B
It is assumed that the heat storage water tank unit 75AB is integrally formed.

Further, a supercooling solenoid valve 21C, an ice making solenoid valve 22C, and an expansion valve 23C on the first refrigerant circuit 6A side are provided.
Refrigeration side heat exchanger 15C, three-way pipe 24C, refrigerant recovery solenoid valve 26AC, check valve 58C, supercooling heat exchanger 40C on the third refrigerant circuit 7B side, and refrigerant flow path 44C.
And the bypass solenoid valve 45C and the heat storage water tank 14C,
It is assumed that the heat storage water tank unit 75C is integrally configured.

Thus, the heat storage water tank unit 75
A, 75B, and 75C can easily add heat storage water tanks by connecting refrigerant pipes. The compressors 70A, 70B and all the solenoid valves, that is, the solenoid valves 72A, 72B, the solenoid valve 19, the ice making solenoid valves 20, 22A, 22B, 22C, 52, the supercooling solenoid valves 21A, 21B, 21C, 30, 63; solenoid valves 26, 63 for refrigerant recovery; solenoid valves 45A, 45 for bypass.
B and 45C are connected to a control device (not shown).

With the above configuration, the cooling system 50
Will be described. First, the ice making mode of the cooling system 50, that is, the first refrigerant circuit 6A that cools the refrigerated showcase 2 performs the normal cooling operation and the heat storage operation of the heat storage water tanks 14A, 14B, and 14C, and the refrigeration showcase 3A. The second refrigerant circuit 7A that cools the refrigerator and the third refrigerant circuit 7B that cools the frozen showcase 3B
A case where the supercooling operation of the refrigerant is performed by using the ice heat stored in the heat storage water tanks 14A, 14B, and 14C in advance will be described.

In the ice making mode, the first control is performed by the control device.
The electromagnetic valve 18 constituting the refrigerant circuit 6A, the electromagnetic valves 22A, 22B, 22C for ice making and the electromagnetic valve 52 for ice making are opened, and the electromagnetic valves 21A, 21B, 21C for supercooling are opened.
It is assumed that the electromagnetic valves 26A, 26B, 26C for refrigerant recovery and the electromagnetic valve 63 for supercooling are closed.

As a result, when the compressor 8 is operated, since the solenoid valve 19 is opened, the high-temperature and high-pressure refrigerant discharged from the compressor 8 flows into the condenser 9 and then flows through the three-way pipe 13. A part of the refrigerant flows into the expansion valve 10 via the solenoid valve 19 and the solenoid valve 18 via the solenoid valve 19. Thus, the refrigerant is depressurized by the expansion valve 10 and then exerts a cooling function in the cooler 11 installed in the refrigerated showcase 2, thereby cooling the inside of the refrigerated showcase 2. And cooler 1
The refrigerant flowing out of 1 returns to the compressor 8.

On the other hand, the branch pipes 12A, 1
The remaining refrigerant flowing into 2B, 12C is opened with the ice making solenoid valves 22A, 22B, 22C opened.
Since the supercooling solenoid valves 21A, 21B, 21C are closed, the ice making solenoid valves 22A, 22B,
After 2C, the pressure is reduced by the expansion valves 23A, 23B and 23C. Then, the depressurized refrigerant exerts a cooling action in the refrigeration-side heat exchangers 15A, 15B, 15C, respectively, thereby performing an ice making step of cooling water and the like in the heat storage water tanks 14A, 14B, 14C.

The controller 26 controls the refrigerant recovery solenoid valve 26.
Since A, 26B and 26C are closed, the refrigerant flowing out of the refrigeration-side heat exchangers 15A, 15B and 15C is:
After flowing into the branch pipes 17A, 17B, and 17C through the check valves 58A, 58B, and 58C, respectively, the respective refrigerants join at the three-way pipes 57 and 59, and then return to the compressor 8 through the ice making electromagnetic valve 52. . At this time, the supercooling solenoid valve 63
Is closed by the control device, the refrigerant flowing out of the branch pipes 17A, 17B, 17C does not flow into the expansion valve 10 side.

On the other hand, the second refrigerant circuit 7A
By operating A, the high-temperature and high-pressure refrigerant discharged from the compressor 70A flows into the condenser 71A, then flows into the supercooling heat exchangers 40A and 40B, and refrigerates the first refrigerant circuit 6A. Using the ice heat storage stored in the heat storage water tanks 14A and 14B by the side heat exchanger 15A or 15B,
A supercooling step of supercooling the refrigerant in the refrigerant circuit 7A is performed. At this time, when the supercooling heat exchangers 40A and 40B require supercooling of the refrigerant by the control device, the bypass solenoid valves 45A and 45B are closed.

When the refrigerant is not supercooled by the supercooling heat exchangers 40A and 40B, that is, when the outside air temperature is low, or when the supercooling heat exchangers 40A and 40B cannot supercool the refrigerant, That is, when the heat storage water tanks 14A and 14B do not have the necessary amount of ice heat storage, the control device opens the bypass solenoid valves 45A and 45B and the supercooling heat exchanger 4
0A and 40B are bypassed. At this time, when the supercooling capacity is relatively small, such as when the load applied to the compressor 70A is small, only one of the bypass solenoid valves 45A or 45B is opened, and the other one of the supercooling heat exchangers 4A and 4B is opened.
Subcooling of the refrigerant may be performed using 0A or 40B.

Then, the subcooling heat exchangers 40A and 40B
Or, the refrigerant that has passed through the bypass solenoid valves 45A and 45B is:
After the pressure is reduced by the expansion valve 73A via the solenoid valve 72A,
The inside of the refrigerator showcase 3A is cooled by exerting a cooling effect by the cooler 74A installed in the refrigerator showcase 3A. Then, the refrigerant flowing out of the cooler 74A returns to the compressor 70A.

The third refrigerant circuit 7B includes a compressor 70
By operating B, the high-temperature and high-pressure refrigerant discharged from the compressor 70B flows into the condenser 71B and then flows into the supercooling heat exchanger 40C, where the refrigeration side heat of the first refrigerant circuit 6A is heated. A supercooling step of supercooling the refrigerant in the third refrigerant circuit 7B using the ice heat stored in the heat storage water tank 14C by the exchanger 15C is performed. At this time, when the supercooling of the refrigerant is required by the supercooling heat exchanger 40C by the control device, the bypass solenoid valve 45C is closed.
When the refrigerant is not supercooled by the supercooling heat exchanger 40C, that is, when the outside air temperature is low, or when the refrigerant cannot be supercooled by the supercooling heat exchanger 40C, that is, when the ice of the heat storage water tank 14C is frozen. When the heat storage is not necessary, the control device opens the bypass solenoid valve 45C to bypass the supercooling heat exchanger 40C.

The refrigerant that has passed through the supercooling heat exchanger 40C or the bypass solenoid valve 45C passes through the solenoid valve 72B, is decompressed by the expansion valve 73B, and is then placed in the refrigerator installed in the freezing showcase 3B. By exerting a cooling action at 74B, the inside of the refrigerator showcase 3B is cooled.
The refrigerant flowing out of the cooler 74B is supplied to the compressor 70B.
Return to B.

With the above configuration, in the ice making mode, ice heat can be stored in the heat storage water tanks 14A, 14B, and 14C without affecting the cooling capacity of the refrigerated showcase 2, whereby the freezing show can be performed. Since the refrigerant in the second refrigerant circuit 7A of the case 3A and the third refrigerant circuit 7B of the freezing showcase 3B can be supercooled,
The load on devices such as the compressors 70A and 70B can be reduced.

The bypass solenoid valves 45A, 45B,
By switching 45C, the supercooling step can be performed only by the required number of heat storage water tanks 14A, 14B or 14C according to the load of the cooling facility, and the amount of refrigerant used can be reduced.

Next, the normal mode of the cooling system 50, that is, the first refrigerant circuit 6A for cooling the refrigerated showcase 2
Performs a normal cooling operation,
A refrigerant circuit 7A that cools A and third refrigeration circuit 7B that cools refrigeration showcase 3B
The case where the supercooling operation of the refrigerant is performed using the ice heat stored in 4A, 14B or 14C will be described.

In the normal mode, the first
The electromagnetic valve 19 and the electromagnetic valve 18 constituting the refrigerant circuit 6 are opened, the ice making electromagnetic valve 52, the supercooling electromagnetic valves 21A, 21B, 21C, and the ice making electromagnetic valves 22A, 22
B, 22C, and refrigerant recovery solenoid valves 26A, 26B, 26
C and the supercooling solenoid valve 63 are assumed to be closed.

Thus, when the compressor 8 is operated, the solenoid valve 19 is opened and each of the supercooling solenoid valves 21
A, 21B, 21C and each ice making solenoid valve 22A, 22B,
Since the 22C is closed, the high-temperature and high-pressure refrigerant discharged from the compressor 8 flows into the condenser 9 and then flows into the three-way pipe 1.
3, the solenoid valve 19 and the solenoid valve 18 to flow into the expansion valve 10. As a result, the refrigerant is depressurized by the expansion valve 10 and then exerts a cooling action in the cooler 11 installed in the refrigerated showcase 2, whereby the refrigerated showcase 2 is cooled.
Cool the inside of the refrigerator. Then, since the ice making electromagnetic valve 52 is closed by the control device, the refrigerant flowing out of the cooler 11 returns to the compressor 8. At this time, the second
The refrigerant circuit 7A and the third refrigerant circuit 7B perform the supercooling operation of the refrigerant.

With the above configuration, in the normal mode, the freezing showcase 3A is utilized by using the ice heat stored in the heat storage water tanks 14A, 14B, 14C in advance without affecting the cooling capacity of the refrigerated showcase 2. And 3B
Of the compressor 70
The load on the devices such as A and 70B can be reduced. In addition, it is possible to equalize the total power consumption.

Next, the first supercooling mode of the cooling system 50, that is, the refrigerant of the first refrigerant circuit 6 for cooling the refrigerated showcase 2 utilizes ice heat stored in the heat storage water tank 14A in advance. In addition to performing the supercooling operation of the refrigerant, the refrigerant of the second refrigerant circuit 7A for cooling the frozen showcase 3A and the refrigerant of the second refrigerant circuit 7B for cooling the frozen showcase 3B are also stored in advance in the heat storage water tanks 14A, 14B, 14C
A case in which the supercooling operation of the refrigerant is performed by using the ice heat stored in the storage device will be described.

In the first supercooling mode, the solenoid valve 18 and the supercooling solenoid valves 21A and 63 constituting the first refrigerant circuit 6A are opened by the control device and the solenoid valve 1 is opened.
9, electromagnetic valves for supercooling 21B, 21C, electromagnetic valves for ice making 22A, 22B, 22C, 52, and electromagnetic valve for refrigerant recovery 2
6A, 26B and 26C are assumed to be closed.

Thus, when the compressor 8 is operated, the solenoid valve 19 is closed and the ice making solenoid valves 22A, 22A,
2B and 22C and the supercooling solenoid valves 21B and 21C are closed, so that the high-temperature and high-pressure refrigerant discharged from the compressor 8 flows into the condenser 9, and then the three-way pipe 13, the branch pipe 12A, The refrigerant flows into the refrigeration-side heat exchanger 15A via the supercooling electromagnetic valve 21A, and performs supercooling of the refrigerant in the first refrigerant circuit 6A by using the ice heat stored in the heat storage water tank 14A in advance.

Since the ice making electromagnetic valve 52 is closed, the refrigerant flowing out of the refrigeration side heat exchanger 15A is
Check valve 58A, branch pipe 17A, three-way pipe 57, 5
6, 64, the check valve 62, the supercooling solenoid valve 63, and the solenoid valve 18 are sequentially reduced in pressure by the expansion valve 10, and then cooled by the cooler 11 installed in the refrigerated showcase 2. It acts to cool the inside of the refrigerator showcase 2. Then, since the ice making electromagnetic valve 52 is closed by the control device, the refrigerant flowing out of the cooler 11 returns to the compressor 8. At this time, the second refrigerant circuit 7A and the third refrigerant circuit 7A
Performs the supercooling operation of the refrigerant.

Next, in the second supercooling mode of the cooling system 50, that is, when the capacity of the heat storage water tank 14A becomes lower than a predetermined temperature, for example, when the temperature of the heat storage water tank 14A becomes higher than a predetermined temperature, the refrigeration showcase The refrigerant of the first refrigerant circuit 6A for cooling the second refrigerant circuit 6A performs a supercooling operation of the refrigerant by using ice heat stored in the heat storage water tank 14B in advance, and the second refrigerant circuit 7A for cooling the frozen showcase 3A. In the case of performing the supercooling operation of the refrigerant using the ice heat stored in the heat storage water tanks 14A, 14B, and 14C also in the second refrigerant circuit 7B that cools the refrigerant and the refrigeration showcase 3B. .

In the second subcooling mode, the control device opens the solenoid valve 18 constituting the first refrigerant circuit 6A, the supercooling solenoid valves 21B and 63, and the refrigerant recovery solenoid valve 26A. , Solenoid valve 19 and supercooling solenoid valve 21
A, 21C, and ice making solenoid valves 22A, 22B, 22C,
52 and the solenoid valves 26B and 26C for refrigerant recovery are assumed to be closed.

Thus, when the compressor 8 is operated, the solenoid valve 19 is closed and the ice making solenoid valves 22A, 22A,
2B and 22C and the supercooling solenoid valves 21A and 21C are closed, so that the high-temperature and high-pressure refrigerant discharged from the compressor 8 flows into the condenser 9 and then flows into the three-way pipe 13 and the branch pipe 12A. , 12B and the supercooling solenoid valve 21B, flows into the refrigeration-side heat exchanger 15B, and performs supercooling of the refrigerant in the first refrigerant circuit 6A using the ice heat stored in the heat storage water tank 14B in advance.

Since the ice making electromagnetic valve 52 is closed, the refrigerant flowing out of the refrigeration side heat exchanger 15B is
Check valve 58B, branch pipe 17B, three-way pipe 59, 5
7, 56, 64, a check valve 62, and a supercooling solenoid valve 63
After that, the pressure is reduced by the expansion valve 10 sequentially through the solenoid valve 18, and then the cooling action is performed by the cooler 11 installed in the refrigerated showcase 2, thereby cooling the inside of the refrigerated showcase 2. Then, since the ice making electromagnetic valve 52 is closed by the control device, the refrigerant flowing out of the cooler 11 returns to the compressor 8.

In the first supercooling mode, the liquid refrigerant stored in the refrigeration-side heat exchanger 15A is discharged from the refrigeration-side heat exchanger 15A because the liquid recovery electromagnetic valve 26A is opened.
The refrigerant returns to the compressor 8 together with the refrigerant flowing out of B. As a result, the amount of refrigerant used can be reduced. At this time, the second refrigerant circuit 7A and the third refrigerant circuit 7B perform the supercooling operation of the refrigerant.

With the above configuration, in the second supercooling mode, the first refrigerant circuit 6A of the refrigerated showcase 2 is utilized by utilizing the ice heat stored in the heat storage water tank 14B in advance.
And the refrigerant in the second refrigerant circuit 7A of the frozen showcase 3A and the refrigerant in the third refrigerant circuit 7B of the frozen showcase 3B can be supercooled. In the daytime when the load is easily applied to the device 3, the load on the devices such as the compressors 8, 70A, and 70B can be reduced.

Next, in the third supercooling mode of the cooling system 50, that is, when the temperature of the heat storage water tank 14A and the temperature of the heat storage water tank 14B reach a predetermined temperature or higher, for example,
When the capacity of B becomes equal to or less than a predetermined value, the refrigerant of the first refrigerant circuit 6A that cools the refrigerated showcase 2 performs the supercooling operation of the refrigerant using the ice heat stored in the heat storage water tank 14C in advance. At the same time, the second for cooling the frozen showcase 3A
The refrigerant in the refrigerant circuit 7A and the refrigerant in the second refrigerant circuit 7B for cooling the refrigerated showcase 3B also perform the supercooling operation using the ice heat stored in the heat storage water tanks 14A, 14B, and 14C in advance. explain.

In the third supercooling mode, the control device controls the solenoid valve 18 constituting the first refrigerant circuit 6A, the supercooling solenoid valves 21C and 63, and the refrigerant recovery solenoid valves 26A and 26A.
26B is opened and the solenoid valve 19, the supercooling solenoid valves 21A and 21B, the ice making solenoid valves 22A and 22B,
22C and 52 and the refrigerant recovery electromagnetic valve 26C are assumed to be closed.

Thus, when the compressor 8 is operated, the solenoid valve 19 is closed and the ice making solenoid valves 22A, 22A,
2B and 22C and the supercooling solenoid valves 21A and 21B are closed, so that the high-temperature and high-pressure refrigerant discharged from the compressor 8 flows into the condenser 9 and then flows into the three-way pipe 13 and the branch pipe 12A. , 12B, 12C and supercooling solenoid valve 21
C, flows into the refrigeration-side heat exchanger 15C, and uses the ice heat stored in the heat storage water tank 14C in advance to store the first refrigerant circuit 6C.
The refrigerant in A is supercooled.

Since the ice making electromagnetic valve 52 is closed, the refrigerant flowing out of the refrigeration side heat exchanger 15C is
Check valve 58C, branch pipe 17C, three-way pipe 59, 5
7, 56, 64, a check valve 62, and a supercooling solenoid valve 63
After that, the pressure is reduced by the expansion valve 10 sequentially through the solenoid valve 18, and then the cooling action is performed by the cooler 11 installed in the refrigerated showcase 2, thereby cooling the inside of the refrigerated showcase 2. Then, since the ice making electromagnetic valve 52 is closed by the control device, the refrigerant flowing out of the cooler 11 returns to the compressor 8.

In the first and second supercooling modes, the liquid refrigerant stored in the refrigeration-side heat exchangers 15A and 15B is discharged from the refrigeration-side heat exchangers 26A and 26B because the liquid recovery electromagnetic valves 26A and 26B are open. The refrigerant returns to the compressor 8 together with the refrigerant flowing out of the exchanger 15C. As a result, the amount of refrigerant used can be reduced. At this time, the second
The refrigerant circuit 7A and the third refrigerant circuit 7B perform the supercooling operation of the refrigerant.

With the above configuration, in the third supercooling mode, the first refrigerant circuit 6A of the refrigerated showcase 2 is utilized by utilizing the ice heat stored in the heat storage water tank 14C in advance.
And the refrigerant in the second refrigerant circuit 7A of the frozen showcase 3A and the refrigerant in the third refrigerant circuit 7B of the frozen showcase 3B can be supercooled. In the daytime when the load is easily applied to the device 3, the load on the devices such as the compressors 8, 70A, and 70B can be reduced.

Next, the liquid recovery mode of the cooling system 50,
That is, the second refrigerant circuit 7A that cools the frozen showcase 3A and the third refrigerant circuit 7B that cools the frozen showcase 3B, while collecting the liquid refrigerant of the refrigeration-side heat exchangers 15A, 15B, and 15C, Heat storage water tanks 14A, 14B,
A case where a supercooling operation is performed using ice heat stored in 14C will be described.

In the liquid recovery mode, the control device controls the solenoid valve 19, the solenoid valve 18, and the coolant collection solenoid valve 26A,
26B and 26C are opened and the ice making solenoid valve 52 is opened.
, Supercooling solenoid valves 21A, 21B, 21C, ice making solenoid valves 22A, 22B, 22C, and supercooling solenoid valve 63.
Shall be closed.

Thus, when the compressor 8 is operated, the solenoid valve 19 is opened and the supercooling solenoid valve 21A,
21B, 21C and ice making electromagnetic valves 22A, 22B, 22C
Is closed, the high-temperature and high-pressure refrigerant discharged from the compressor 8 flows into the condenser 9, and then the three-way pipe 13
It flows into the expansion valve 10 via the solenoid valve 19 and the solenoid valve 18. Thus, the refrigerant is depressurized by the expansion valve 10 and then exerts a cooling function in the cooler 11 installed in the refrigerated showcase 2, thereby cooling the inside of the refrigerated showcase 2. Then, the electromagnetic valve 5 for ice making is controlled by the control device.
Since the valve 2 is closed, the refrigerant flowing out of the cooler 11 returns to the compressor 8.

At this time, the refrigerant recovery solenoid valves 26A, 26A
B and 26C are opened by the control device and the compressor 8 is operated, so that the refrigeration-side heat exchangers 15A, 15B,
The refrigerant stored in 15C is a refrigerant collection electromagnetic valve 26A,
26B, 26C, and are collected by the compressor 8 via the branch pipes 25A, 25B, 25C. Note that, also at this time, the second refrigerant circuit 7A and the third refrigerant circuit 7B perform the supercooling operation of the refrigerant.

With the above configuration, the refrigeration side heat exchanger 15
After sufficiently recovering the liquid refrigerant stored in A, 15B, and 15C in the compressor 8, the operation of the compressor 8 allows the cooling operation to be performed with a relatively small amount of refrigerant.

[0106]

As described in detail above, according to the present invention, a refrigerant circuit is constituted by connecting a compressor, a condenser, a decompression means, a cooler for cooling a cooling facility, and the like in a ring shape. A heat storage water tank equipped with a heat exchanger and a refrigerant that has passed through the condenser are depressurized and flown to the heat exchanger to perform an ice making process in the heat storage water tank, or to perform heat without depressurizing the refrigerant that has passed through the condenser. After flowing to the exchanger, by flowing to the decompression means, it is provided with a flow path control means for controlling whether to perform a supercooling step of the refrigerant, so when not cooling the cooling equipment, the refrigerant passed through the condenser Reduce the pressure and flow it to the heat exchanger, perform the ice making process of making ice in the heat storage water tank, and when cooling the cooling equipment, flow the refrigerant through the condenser to the heat exchanger without reducing the pressure,
A supercooling step of supercooling the refrigerant using the ice heat stored in the heat storage water tank made in the ice making step can be performed.

[0107] Thereby, usually, the ice making process of the heat storage water tank is performed at night or the like when the electric power consumption is small, and the ice heat storage of the heat storage water tank is used at the day time when the electric power consumption is large and the load such as the compressor is loaded. A supercooling process that supercools the refrigerant that has passed through the condenser, making it possible to equalize the amount of power used per day and reduce the load on equipment such as compressors. Will be able to

According to the second aspect of the present invention, there is provided a refrigerant circuit constituted by connecting a compressor, a condenser, a pressure reducing means, a cooler for cooling a cooling facility, and the like in a ring shape.
A plurality of heat storage water tanks each equipped with a heat exchanger, and the refrigerant passing through the condenser is depressurized and flown to the heat exchanger, thereby performing an ice making process of making ice in the heat storage water tank, or depressurizing the refrigerant passing through the condenser. After flowing through the heat exchanger without flowing, by flowing through the depressurizing means, it is provided with a plurality of flow path control means for independently controlling whether to perform the supercooling step of the refrigerant for each heat storage water tank,
If the cooling equipment is not cooled, the refrigerant that has passed through the condenser is depressurized and flown to the heat exchanger, and an ice making process is performed to make ice in the heat storage water tank.If the cooling equipment is cooled, the refrigerant that has passed through the condenser is cooled. It is possible to perform a supercooling step in which the refrigerant flows into the heat exchanger without being depressurized and the refrigerant is supercooled using the ice heat stored in the heat storage water tank made in the ice making step.

In this manner, the ice storage process of the heat storage water tank is usually performed at night or the like when the amount of power consumption is small, and the ice storage of the heat storage water tank is used during the daytime when the amount of power consumption is large and loads such as compressors are applied. A supercooling process that supercools the refrigerant that has passed through the condenser, making it possible to equalize the amount of power used per day and reduce the load on equipment such as compressors. Will be able to

The refrigerant flowing through the condenser flows through the heat exchanger without being depressurized, and then flows through the depressurizing means, so that whether the supercooling step of the refrigerant is performed is controlled independently for each heat storage water tank. Since the flow path control means is provided, a single or a plurality of heat storage water tanks for performing the supercooling step of the refrigerant can be provided, and the convenience is improved.

According to the third aspect of the present invention, in addition to the second aspect of the present invention, the flow path control means performs ice making in all the heat storage water tanks when performing the ice making step and performs the super cooling step when performing the super cooling step. Performs supercooling of the refrigerant in one or more heat storage water tanks according to the cooling load, so that the supercooling process can be performed only with the required number of heat storage water tanks according to the load of the cooling equipment, The amount can be reduced.

According to the invention of claim 4, in addition to the invention of claim 1, 2, or 3, the refrigerant circuit is a refrigeration refrigerant circuit, and the heat storage water tank is different from the refrigerant circuit. Since it has a heat exchanger for subcooling the refrigerant of the refrigerant circuit for refrigeration,
Equipment such as a compressor that constitutes a refrigeration refrigerant circuit by exchanging heat with the ice subcooling heat exchanger of the refrigeration refrigerant circuit by making ice heat in the heat storage water tank in the refrigeration refrigerant circuit. Can be reduced, and the total power consumption can be leveled.

According to the fifth aspect of the present invention, in addition to the first, second, third or fourth aspect of the present invention, the heat storage water tank and the flow path control means are integrated as a unit. The efficiency of the installation work can be improved, and the complicated piping connection can be simplified.

According to the sixth aspect of the present invention, in addition to the fifth aspect of the present invention, there is provided a bypass means for forming a refrigerant flow path bypassing the refrigerant supercooling heat exchanger of the refrigeration circuit. Since the bypass means is integrated as a unit with the heat storage water tank and the flow path control means, the efficiency of the installation work can be further improved, and the complicated piping connection can be simplified. Will be able to

According to the seventh aspect of the present invention, in addition to the first, second, third, fourth, fifth or sixth aspects of the present invention, the flow rate of the refrigerant to the heat storage water tank is controlled. Refrigerant flow control means, and the refrigerant flow control means is configured by unitizing a plurality of valve devices, so that the efficiency of installation work can be improved and connection of the valve devices can be improved. It can be simplified.

[Brief description of the drawings]

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

FIG. 2 is a refrigerant circuit diagram illustrating an ice making mode of the cooling system of the present invention.

FIG. 3 is a refrigerant circuit diagram illustrating a normal mode of the cooling system of the present invention.

FIG. 4 is a refrigerant circuit diagram illustrating a supercooling mode of the cooling system of the present invention.

FIG. 5 is a refrigerant circuit diagram illustrating a liquid recovery mode of the cooling system of the present invention.

FIG. 6 is a refrigerant circuit diagram of the cooling system of the present invention.

[Explanation of symbols]

1, 50 Cooling system 2 Refrigerated showcase 3, 3A, 3B Freezer showcase 6 First refrigerant circuit 7, 7A Second refrigerant circuit 7B Third refrigerant circuit 8, 38, 70A, 70B Compressors 9, 39, 71A, 71B Condenser 10, 23, 23A, 23B, 23C, 42, 73A,
73B Expansion valve 11, 43, 74A, 74B Cooler 14, 14A, 14B, 14C Heat storage water tank 15, 15A, 15B, 15C Refrigeration-side heat exchanger 19 Solenoid valve 20 Ice making solenoid valve 21, 21A, 21B, 21C, 30 , 63 Supercooling solenoid valve 22, 22A, 22B, 22C, 52 Ice making solenoid valve 26, 26A, 26B, 53 Refrigerant recovery solenoid valve 33, 65 Control piping unit 40, 40A, 40B, 40C Refrigerant supercooling heat Exchanger 45, 45A, 45B, 45C Bypass solenoid valve 46, 75A, 75B, 75C Heat storage water tank unit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L045 AA01 AA03 BA01 BA10 CA02 DA02 HA02 HA06 HA07 HA09 JA13 JA14 KA15 LA12 MA11 NA16 PA05

Claims (7)

[Claims] A refrigerant circuit configured by annularly connecting a compressor, a condenser, a decompression means, a cooler for cooling cooling equipment, and the like; a heat storage water tank including a heat exchanger; By reducing the pressure of the refrigerant that has passed through the condenser and flowing the same through the heat exchanger, an ice making step of making ice in the heat storage water tank is performed, or after the refrigerant that has passed through the condenser flows through the heat exchanger without depressurization. And a flow path control means for controlling whether or not to perform a supercooling step of the refrigerant by flowing the refrigerant into the pressure reducing means. 2. A refrigerant circuit constituted by connecting a compressor, a condenser, a decompression means, and a cooler for cooling cooling equipment in a ring shape, and a plurality of heat storage water tanks each having a heat exchanger. By reducing the pressure of the refrigerant that has passed through the condenser and flowing the same through the heat exchanger, an ice making process is performed to make ice in the heat storage water tank, or the heat exchanger is passed through the heat exchanger without depressurizing the refrigerant that has passed through the condenser. After flowing, by flowing to the decompression means, a plurality of flow path control means for independently controlling whether to perform a supercooling step of the refrigerant for each of the heat storage water tank, for cooling equipment characterized by comprising Ice storage system. 3. The flow path control means, when performing the ice making step, performs ice making in all of the heat storage water tanks, and when performing the sub-cooling step, performs single or multiple operation according to a cooling load. 3. The heat storage system for cooling equipment according to claim 2, wherein the refrigerant is supercooled in the heat storage water tank. 4. The refrigerant circuit is a refrigeration refrigerant circuit, and the heat storage water tank further includes a refrigerant subcooling heat exchanger of a refrigeration refrigerant circuit different from the refrigerant circuit. 4. The ice heat storage system for a cooling facility according to claim 1, 2 or 3. 5. The ice heat storage system for cooling equipment according to claim 1, wherein said heat storage water tank and said flow path control means are integrated as a unit. . 6. A refrigeration circuit comprising bypass means for forming a refrigerant flow path bypassing a refrigerant supercooling heat exchanger of the refrigeration circuit, and the bypass means is formed as a unit together with the heat storage water tank and flow path control means. The ice heat storage system for cooling equipment according to claim 5, wherein the ice heat storage system is integrated. 7. A refrigerant flow control means for controlling a refrigerant flow to the heat storage water tank, wherein the refrigerant flow control means comprises:
7. The ice heat storage system for cooling equipment according to claim 1, wherein a plurality of valve devices are configured as a unit.